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1

Induction motor control  

NASA Astrophysics Data System (ADS)

Electromechanical actuators developed to date have commonly ultilized permanent magnet (PM) synchronous motors. More recently switched reluctance (SR) motors have been advocated due to their robust characteristics. Implications of work which utilized induction motors and advanced control techniques are discussed. When induction motors are operated from an energy source capable of controlling voltages and frequencies independently, drive characteristics are obtained which are superior to either PM or SR motors. By synthesizing the machine frequency from a high-frequency carrier (nominally 20 kHz), high efficiencies, low distortion, and rapid torque response are available. At this time multiple horsepower machine drives were demonstrated, and work is on-going to develop a 20 hp average, 40 hp peak class of aerospace actuators. This effort is based upon high-frequency power distribution and management techniques developed by NASA for Space Station Freedom.

Hansen, Irving G.

2

Induction motor control  

NASA Technical Reports Server (NTRS)

Electromechanical actuators developed to date have commonly ultilized permanent magnet (PM) synchronous motors. More recently switched reluctance (SR) motors have been advocated due to their robust characteristics. Implications of work which utilized induction motors and advanced control techniques are discussed. When induction motors are operated from an energy source capable of controlling voltages and frequencies independently, drive characteristics are obtained which are superior to either PM or SR motors. By synthesizing the machine frequency from a high-frequency carrier (nominally 20 kHz), high efficiencies, low distortion, and rapid torque response are available. At this time multiple horsepower machine drives were demonstrated, and work is on-going to develop a 20 hp average, 40 hp peak class of aerospace actuators. This effort is based upon high-frequency power distribution and management techniques developed by NASA for Space Station Freedom.

Hansen, Irving G.

1990-01-01

3

Induction motor control  

NASA Technical Reports Server (NTRS)

Electromechanical actuators developed to date have commonly utilized permanent magnet (PM) synchronous motors. More recently switched reluctance (SR) motors have been advocated due to their robust characteristics. Implications of work which utilizes induction motors and advanced control techniques are discussed. When induction motors are operated from an energy source capable of controlling voltages and frequencies independently, drive characteristics are obtained which are superior to either PM or SR motors. By synthesizing the machine frequency from a high frequency carrier (nominally 20 kHz), high efficiencies, low distortion, and rapid torque response are available. At this time multiple horsepower machine drives were demonstrated, and work is on-going to develop a 20 hp average, 40 hp peak class of aerospace actuators. This effort is based upon high frequency power distribution and management techniques developed by NASA for Space Station Freedom.

Hansen, Irving G.

1990-01-01

4

Motion control with induction motors  

Microsoft Academic Search

Induction motors (IM) provide a very wide speed range, mechanically robust and relatively low cost motion control option. An up-to-date summary of the status of induction motor motion control technology is the subject of this paper. The topics which this paper includes are as follows: basic motion control system requirements; field orientation instantaneous torque control principles for induction motors (FO-IM);

ROBERT D. LORENZ; THOMAS A. LIPO; DONALD W. NOVOTNY

1994-01-01

5

Four quadrant control of induction motors  

NASA Astrophysics Data System (ADS)

Induction motors are the nation's workhorse, being the motor of choice in most applications due to their simple rugged construction. It has been estimated that 14 to 27 percent of the country's total electricity use could be saved with adjustable speed drives. Until now, induction motors have not been suited well for variable speed or servo-drives, due to the inherent complexity, size, and inefficiency of their variable speed controls. Work at NASA Lewis Research Center on field oriented control of induction motors using pulse population modulation method holds the promise for the desired drive electronics. The system allows for a variable voltage to frequency ratio which enables the user to operate the motor at maximum efficiency, while having independent control of both the speed and torque of an induction motor in all four quadrants of the speed torque map. Multiple horsepower machine drives were demonstrated, and work is on-going to develop a 20 hp average, 40 hp peak class of machine. The pulse population technique, results to date, and projections for implementation of this existing new motor control technology are discussed.

Hansen, Irving G.

1991-03-01

6

Bifurcation and control of chaos in Induction motor drives  

E-print Network

The induction motor controlled by Indirect Field Oriented Control (IFOC) is known to have high performance and better stability. This paper reports the dynamical behavior of an indirect field oriented control (IFOC) induction motor drive in the light of bifurcation theory. The speed of high performance induction motor drive is controlled by IFOC method. The knowledge of qualitative change of the behavior of the motor such as equilibrium points, limit cycles and chaos with the change of motor parameters and load torque are essential for proper control of the motor. This paper provides a numerical approach to understand better the dynamical behavior of an indirect field oriented control of a current-fed induction motor. The focus is on bifurcation analysis of the IFOC motor, with a particular emphasis on the change that affects the dynamics and stability under small variations of Proportional Integral controller (PI) parameters, load torque and k, the ratio of the rotor time constant and its estimate etc. Bifurcation diagrams are computed. This paper also attempts to discuss various types of the transition to chaos in the induction motor. The results of the obtained bifurcation simulations give useful guidelines for adjusting both motor model and PI controller parameters. It is also important to ensure desired operation of the motor when the motor shows chaotic behavior. Infinite numbers of unstable periodic orbits are embedded in a chaotic attractor. Any unstable periodic orbit can be stabilized by proper control algorithm. The delayed feedback control method to control chaos has been implemented in this system.

Krishnendu Chakrabarty; Urmila Kar

2014-10-24

7

Gain scheduling control of induction motor with artificial neural networks  

Microsoft Academic Search

This paper presents a nonlinear gain scheduling control of a nonlinear, time varying induction motor dynamics with unknown parameters based on pole placement control design. The objective of this control is to force the rotor speed to follow an arbitrarily prescribed trajectory. Neural networks are considered to produce a non parametric model of a nonlinear inverted-fed induction motor. However it's

Abdelmajid Rahmouni; Gerard Lachiver

2003-01-01

8

FUZZY LOGIC CONTROL OF AC INDUCTION MOTORS  

EPA Science Inventory

The paper discusses the fuzzy logic control (FLC) of electric motors, being investigated under the sponsorship of the U.S. EPA to reduce energy consumption when motors are operated at less than rated speeds and loads. lectric motors use 60% of the electrical energy generated in t...

9

A Fault Tolerant Control Design for Induction Motors  

Microsoft Academic Search

This paper describes a fault tolerant controller for high performance induction motor drive. The proposed approach aims to make the motor tolerant to both internal and external factors such as loading, temperature and sensor failure. To achieve this goal, a controller that switches itself between a control strategy designed for nominal operation and a robust control strategy designed for faulty

Afef Fekih; Fahmida N. Chowdhury

2005-01-01

10

Single phase induction motor with an electronically controlled capacitor  

Microsoft Academic Search

A single-phase induction motor using a novel electronically controlled capacitor is described. The system uses a DC capacitor switched by a transistor H bridge. By proper control of the transistor switching the circuit synthesizes a continuously variable capacitance in series with the auxiliary winding. The system could be used to replace standard single-phase motor capacitor configurations to provide improved machine

T. M. Lettenmaier; D. W. Novotny; T.A. Lipo

1988-01-01

11

Single-phase induction motor with an electronically controlled capacitor  

Microsoft Academic Search

A single-phase induction motor using an electronically controlled capacitor is described. The system uses a DC capacitor switched by a transistor H bridge. By proper control of the transistor switching, the circuit synthesizes a continuously variable capacitance in series with the auxiliary winding. The system could be used to replace standard single-phase motor capacitor configurations to provide improved machine performance.

Terrance A. Lettenmaier; Donald W. Novotny; Thomas A. Lipo

1991-01-01

12

Control system for an induction motor with energy recovery  

NASA Astrophysics Data System (ADS)

A control circuit for an induction motor powered system is disclosed in which a power factor controlled servo loop is used to control, via the phase angle of firing of a triac, the power input to the motor, as a function of load placed on the motor by machinery of the powered system. Then, upon application of torque by this machinery to the motor, which tends to overspeed the motor, the firing angle of the triac is automatically set to a fixed, and relatively short, firing angle.

Nola, F. J.

1983-11-01

13

Field-Oriented Control Of Induction Motors  

NASA Technical Reports Server (NTRS)

Field-oriented control system provides for feedback control of torque or speed or both. Developed for use with commercial three-phase, 400-Hz, 208-V, 5-hp motor. Systems include resonant power supply operating at 20 kHz. Pulse-population-modulation subsystem selects individual pulses of 20-kHz single-phase waveform as needed to synthesize three waveforms of appropriate lower frequency applied to three phase windings of motor. Electric actuation systems using technology currently being built to peak powers of 70 kW. Amplitude of voltage of effective machine-frequency waveform determined by momentary frequency of pulses, while machine frequency determined by rate of repetition of overall temporal pattern of pulses. System enables independent control of both voltage and frequency.

Burrows, Linda M.; Roth, Mary Ellen; Zinger, Don S.

1993-01-01

14

Nonlinear control for linear induction motor servo drive  

Microsoft Academic Search

This paper describes a newly designed nonlinear control strategy to control a linear induction motor servo drive for periodic motion. Based on the concept of the nonlinear state feedback theory and optimal technique, a nonlinear control strategy, which is composed of an adaptive optimal control system and a sliding-mode flux observation system, is developed to improve the drawbacks in previous

Rong-Jong Wai; Wei-Kuo Liu

2003-01-01

15

Discontinuous SVPWM Techniques for Double Star Induction Motor Drive Control  

Microsoft Academic Search

In this paper, we present SVPWM control techniques suitable for a double-star induction motor drive (DSIM). The induction machine has two sets of three-phase stator windings spatially shifted by 30 electrical degrees. Each set of three-phase stator windings is fed by a three-phase inverter. Continuous and discontinuous space vector PWM techniques are presented. Implementation on a DSP controller board is

Khoudir Marouani; Lotfi Baghli; Djafar Hadiouche; Abdelaziz Kheloui; Abderrezak Rezzoug

2006-01-01

16

Implementation of a new fuzzy vector control of induction motor.  

PubMed

The aim of this paper is to present a new approach to control an induction motor using type-1 fuzzy logic. The induction motor has a nonlinear model, uncertain and strongly coupled. The vector control technique, which is based on the inverse model of the induction motors, solves the coupling problem. Unfortunately, in practice this is not checked because of model uncertainties. Indeed, the presence of the uncertainties led us to use human expertise such as the fuzzy logic techniques. In order to maintain the decoupling and to overcome the problem of the sensitivity to the parametric variations, the field-oriented control is replaced by a new block control. The simulation results show that the both control schemes provide in their basic configuration, comparable performances regarding the decoupling. However, the fuzzy vector control provides the insensitivity to the parametric variations compared to the classical one. The fuzzy vector control scheme is successfully implemented in real-time using a digital signal processor board dSPACE 1104. The efficiency of this technique is verified as well as experimentally at different dynamic operating conditions such as sudden loads change, parameter variations, speed changes, etc. The fuzzy vector control is found to be a best control for application in an induction motor. PMID:24629620

Rafa, Souad; Larabi, Abdelkader; Barazane, Linda; Manceur, Malik; Essounbouli, Najib; Hamzaoui, Abdelaziz

2014-05-01

17

A modified direct torque control for induction motor sensorless drive  

Microsoft Academic Search

Direct torque control (DTC) is known to produce quick and robust response in AC drives. However, during steady state, notable torque, flux and current pulsations occur. They are reflected in speed estimation, speed response, and also in increased acoustical noise. This paper introduces a new direct torque and flux control based on space-vector modulation (DTC-SVM) for induction motor sensorless drives.

Cristian Lascu; Ion Boldea; Frede Blaabjerg

2000-01-01

18

Fault tolerant vector control of induction motor drive  

NASA Astrophysics Data System (ADS)

For electric composed of technical objects hazardous industries, such as nuclear, military, chemical, etc. an urgent task is to increase their resiliency and survivability. The construction principle of vector control system fault-tolerant asynchronous electric. Displaying recovery efficiency three-phase induction motor drive in emergency mode using two-phase vector control system. The process of formation of a simulation model of the asynchronous electric unbalance in emergency mode. When modeling used coordinate transformation, providing emergency operation electric unbalance work. The results of modeling transient phase loss motor stator. During a power failure phase induction motor cannot save circular rotating field in the air gap of the motor and ensure the restoration of its efficiency at rated torque and speed.

Odnokopylov, G.; Bragin, A.

2014-10-01

19

A High Performance Induction Motor Drive System Using Fuzzy Logic Controller  

Microsoft Academic Search

Basically, the motor drive system comprises a voltage source inverter-fed induction motor (VSIM): namely a three-phase voltage source inverter and the induction motor. The squirrel-cage induction motor voltage equations are based on an orthogonal d-q reference-rotating frame where the coordinates rotate with the controlled source frequency. The paper presents a novel fuzzy logic controller for high performance induction motor drive

N. B. Muthuselvan; S. S. Dash; P. Somasundaram

2006-01-01

20

Design and Control of the Induction Motor Propulsion of an Electric Vehicle  

E-print Network

Design and Control of the Induction Motor Propulsion of an Electric Vehicle B. Tabbache1,2 , A for presizing the induction motor propulsion of an Electric Vehicle (EV). Based on the EV desired performances for different induction motor-based EVs using a siding mode control technique. Index Terms--Electric Vehicle (EV

Brest, Université de

21

Speed and flux sensorless field oriented control of induction motors for electric vehicles  

Microsoft Academic Search

An electric bus system has been operating in the downtown area of Chattanooga, TN. The buses use traditional hard-switched IGBT inverters driving special induction motors with a speed sensor (tachometer) and two embedded flux-sensing windings to provide rotor speed and flux information to the motor controller for implementation of high performance field oriented control (vector control). The induction motor is

F. Z. Peng

2000-01-01

22

SDTC-EKF Control of an Induction Motor Based Electric Vehicle B. Tabbache1,2  

E-print Network

SDTC-EKF Control of an Induction Motor Based Electric Vehicle B. Tabbache1,2 , A. Kheloui2 , M torque control of an induction motor based electric vehicle. In this case, stator flux and rotational for an electric vehicle control. Keywords: Sensorless Direct Torque Control (SDTC), Extented Kalman Filter (EKF

Paris-Sud XI, Université de

23

Neural and Fuzzy Adaptive Control of Induction Motor Drives  

SciTech Connect

This paper proposes an adaptive neural network speed control scheme for an induction motor (IM) drive. The proposed scheme consists of an adaptive neural network identifier (ANNI) and an adaptive neural network controller (ANNC). For learning the quoted neural networks, a back propagation algorithm was used to automatically adjust the weights of the ANNI and ANNC in order to minimize the performance functions. Here, the ANNI can quickly estimate the plant parameters and the ANNC is used to provide on-line identification of the command and to produce a control force, such that the motor speed can accurately track the reference command. By combining artificial neural network techniques with fuzzy logic concept, a neural and fuzzy adaptive control scheme is developed. Fuzzy logic was used for the adaptation of the neural controller to improve the robustness of the generated command. The developed method is robust to load torque disturbance and the speed target variations when it ensures precise trajectory tracking with the prescribed dynamics. The algorithm was verified by simulation and the results obtained demonstrate the effectiveness of the IM designed controller.

Bensalem, Y. [Research Unit of Modelisation, Analyse, Command of Systems MACS (Tunisia); Sbita, L.; Abdelkrim, M. N. [6029 Universite High School of Engineering-Gabes-Tunisia (Tunisia)

2008-06-12

24

Variable-frequency inverter controls torque, speed, and braking in ac induction motors  

NASA Technical Reports Server (NTRS)

Dc to ac inverter provides optimum frequency and voltage to ac induction motor, in response to different motor-load and speed requirements. Inverter varies slip frequency of motor in proportion to required torque. Inverter protects motor from high current surges, controls negative slip to apply braking, and returns energy stored in momentum of load to dc power source.

Nola, F. J.

1974-01-01

25

Speed control of induction motor using genetic algorithm based fuzzy controller  

Microsoft Academic Search

The fuzzy logic controller has been focused in the field of vector control of induction motors. However, a systematic method for designing and tuning the fuzzy logic controller is not developed yet. In this paper, an auto-tuning method for fuzzy logic controller based on the genetic algorithm is presented. In the proposed method, normalization parameters and membership function parameters of

Won-Seok Oh; Young-Tae Kim; Chang-Sun Kim; Tae-Seok Kwon; Hee-Jun Kim

1999-01-01

26

Loss minimization in scalar-controlled induction motor drives with search controllers  

SciTech Connect

Loss minimization in scalar-controlled induction motor drives (IMD) with search controllers (SC) is investigated. The problems arising when the input power is used as the controlled variable are described. It is proved that better results are achieved if the stator current is used as the controlled variable.

Kioskeridis, I.; Margaris, N. [Aristotle Univ. of Thessaloniki (Greece). Dept. of Electrical and Computer Engineering] [Aristotle Univ. of Thessaloniki (Greece). Dept. of Electrical and Computer Engineering

1996-03-01

27

Sensorless speed control of induction motor derives using a robust and adaptive neuro-fuzzy based intelligent controller  

Microsoft Academic Search

In this paper a novel sensorless adaptive neurofuzzy speed controller for induction motor derives is formulated. An artificial neural network (ANN) is adopted to estimate the motor speed and thus provide a sensorless speed estimator system. The performance of the proposed adaptive neurofuzzy speed controller is evaluated for a wide range of operating conditions for induction motor. These include startup,

Farzan Rashidi

2004-01-01

28

EFFICIENCY OPTIMIZATIN CONTROL OF AC INDUCTION MOTORS: INITIAL LABORATORY RESULTS  

EPA Science Inventory

The report discusses the development of a fuzzy logic, energy-optimizing controller to improve the efficiency of motor/drive combinations that operate at varying loads and speeds. This energy optimizer is complemented by a sensorless speed controller that maintains motor shaft re...

29

EFFICIENCY OPTIMIZATION CONTROL OF AC INDUCTION MOTORS: INITIAL LABORATORY RESULTS  

EPA Science Inventory

The report discusses the development of a fuzzy logic, energy-optimizing controller to improve the efficiency of motor/drive combinations that operate at varying loads and speeds. his energy optimizer is complemented by a sensorless speed controller that maintains motor shaft rev...

30

FUZZY-LOGIC-BASED CONTROLLERS FOR EFFICIENCY OPTIMIZATION OF INVERTER-FED INDUCTION MOTOR DRIVES  

EPA Science Inventory

This paper describes a fuzzy-logic-based energy optimizing controller to improve the efficiency of induction motor/drives operating at various load (torque) and speed conditions. Improvement of induction motor efficiency is important not only from the considerations of energy sav...

31

Development and Control of a Three DOF Planar Induction Motor Masaaki Kumagai and Ralph L. Hollis  

E-print Network

control driver and three optical mouse sensors. First, an idea to combine linear induction motor Reaction plate Back iron plate Gap Pitch Fig. 1. A model of linear induction motor. optical mouse sensors[5, developed system and its measured characteristics follow. Experimental results indicate potential of its

32

Sensor Fault-Tolerant Control of an Induction Motor Based Electric Vehicle Bekhera Tabbache1,2  

E-print Network

Sensor Fault-Tolerant Control of an Induction Motor Based Electric Vehicle Bekheïra Tabbache1://www.lbms.fr Keywords Electric Vehicle (EV), Induction motor, Sensor fault, Fault-tolerant control (FTC), Direct torque a reconfigurable direct torque control of an induction motor-based electric vehicle. The proposed strategy concerns

Paris-Sud XI, Université de

33

Disturbance invariant speed controlled servo drive with Tesla's induction motor  

Microsoft Academic Search

From the late nineteenth century to the present, Tesla's motor has been advantageously used in many applications where the torque capabilities, acceleration characteristics, power density, and high degree of reliability are indispensable. Nevertheless, in the design of high performance electrical drives, the choice of DC motor was preferable, since its torque and flux are controlled independently through two separate terminals.

M. R. Stojic; M. S. Matijevic

2001-01-01

34

Variable frequency inverter for ac induction motors with torque, speed and braking control  

NASA Technical Reports Server (NTRS)

A variable frequency inverter was designed for driving an ac induction motor which varies the frequency and voltage to the motor windings in response to varying torque requirements for the motor so that the applied voltage amplitude and frequency are of optimal value for any motor load and speed requirement. The slip frequency of the motor is caused to vary proportionally to the torque and feedback is provided so that the most efficient operating voltage is applied to the motor. Winding current surge is limited and a controlled negative slip causes motor braking and return of load energy to a dc power source.

Nola, F. J. (inventor)

1975-01-01

35

Control of a polyphase induction generator\\/induction motor power conversion system completely isolated from the utility  

Microsoft Academic Search

Two squirrel cage induction machines interconnected via a 20 kHz parallel resonant high frequency (HF) AC link and associated switching pulse density modulated (PDM) power converters are investigated, one operating as a generator and the other as a motor. No capacitors are used for the excitation of the generator or motor. Instead, the real power of the generator is controlled

Irfan Alan; Thomas A. Lipo

1994-01-01

36

Constant slip control of induction motor at light load  

SciTech Connect

The most widely used AC motor drives adopt Rated Flux Control (RFC) method. However, at light load condition, RFC causes excessive iron loss, thus the conversion efficiency of the drive system impaired. This paper introduces a new control approach--Constant Slip Control (CSC), which minimize the stator current at light load, so that the iron loss and reactive power consumption of the motor are decreased. Simulation results compare the power consumption of CSC with that of RFC in order to validate the theoretical development. In the last part, realization of CSC is discussed.

Feng Xiaogang; Chen Boshi [Shanghai Univ. (China). School of Automation

1996-12-31

37

Neural Network Enhanced Optimal Self-tuning Controller Design for Induction Motors  

Microsoft Academic Search

This is a case study of application of Global Optimisation (GO), in which a discrete optimal self-tuning controller is designed\\u000a to regulate the speed of rotor and the amplitude of the rotor flux in an induction motor drive system. Firstly the non-linear\\u000a dynamics of the induction motor is approximated by a linear model, around its operation point, through a recursive

Q. M. Zhu; L. Z. Guo; Z. Ma

38

Emotional Learning Based Intelligent Controllers for Rotor Flux Oriented Control of Induction Motor  

NASA Astrophysics Data System (ADS)

This paper presents design and evaluation of a novel approach based on emotional learning to improve the speed control system of rotor flux oriented control of induction motor. The controller includes a neuro-fuzzy system with speed error and its derivative as inputs. A fuzzy critic evaluates the present situation, and provides the emotional signal (stress). The controller modifies its characteristics so that the critics stress is reduced. The comparative simulation results show that the proposed controller is more robust and hence found to be a suitable replacement of the conventional PI controller for the high performance industrial drive applications.

Abdollahi, Rohollah; Farhangi, Reza; Yarahmadi, Ali

2014-08-01

39

Variable-Speed Induction Motor Drives for Aircraft Environmental Control Compressors  

NASA Technical Reports Server (NTRS)

New, more-efficient designs for aircraft jet engines are not capable of supplying the large quantities of bleed air necessary to provide pressurization and air conditioning for the environmental control systems (ECS) of the next generation of large passenger aircraft. System analysis and engineering have determined that electrically-driven ECS can help to maintain the improved fuel efficiencies; and electronic controllers and induction motors are now being developed in a NASA/NPD SBIR Program to drive both types of ECS compressors. Previous variable-speed induction motor/controller system developments and publications have primarily focused on field-oriented control, with large transient reserve power, for maximum acceleration and optimum response in actuator and robotics systems. The application area addressed herein is characterized by slowly-changing inputs and outputs, small reserve power capability for acceleration, and optimization for maximum efficiency. This paper therefore focuses on the differences between this case and the optimum response case, and shows the development of this new motor/controller approach. It starts with the creation of a new set of controller requirements. In response to those requirements, new control algorithms are being developed and implemented in an embedded computer, which is integrated into the motor controller closed loop. Buffered logic outputs are used to drive the power switches in a resonant-technology, power processor/motor-controller, at switching/resonant frequencies high enough to support efficient high-frequency induction motor operation at speeds up to 50,000-RPA

Mildice, J. W.; Hansen, I. G.; Schreiner, K. E.; Roth, M. E.

1996-01-01

40

Sensor and sensorless fault tolerant control for induction motors using a wavelet index.  

PubMed

Fault Tolerant Control (FTC) systems are crucial in industry to ensure safe and reliable operation, especially of motor drives. This paper proposes the use of multiple controllers for a FTC system of an induction motor drive, selected based on a switching mechanism. The system switches between sensor vector control, sensorless vector control, closed-loop voltage by frequency (V/f) control and open loop V/f control. Vector control offers high performance, while V/f is a simple, low cost strategy with high speed and satisfactory performance. The faults dealt with are speed sensor failures, stator winding open circuits, shorts and minimum voltage faults. In the event of compound faults, a protection unit halts motor operation. The faults are detected using a wavelet index. For the sensorless vector control, a novel Boosted Model Reference Adaptive System (BMRAS) to estimate the motor speed is presented, which reduces tuning time. Both simulation results and experimental results with an induction motor drive show the scheme to be a fast and effective one for fault detection, while the control methods transition smoothly and ensure the effectiveness of the FTC system. The system is also shown to be flexible, reverting rapidly back to the dominant controller if the motor returns to a healthy state. PMID:22666016

Gaeid, Khalaf Salloum; Ping, Hew Wooi; Khalid, Mustafa; Masaoud, Ammar

2012-01-01

41

Sensorless 3-level inverter-fed induction motor drive based on indirect torque control  

Microsoft Academic Search

A sensorless induction motor drive fed by 3-level inverter is presented, which combines the principle of indirect torque control, space vector modulation (SVM), speed adaptive flux observer and fuzzy logic controller (FLC). By using SVM, the switching frequency is kept constant and it is easy to solve the problems such as neutral point balance, voltage jump, etc, and more accurate

Yongchang Zhang; Zhengming Zhao; Ting Lu; Liqiang Yuan

2009-01-01

42

The Analysis of Induction Motors with Voltage Control by Symmetrically Triggered Thyristors  

Microsoft Academic Search

The application of thyristor switching to induction motor speed control has resulted in a number of unconventional supply systems. One such technique, which has been successfully employed in a number of applications, is variable voltage control by means of symmetrically triggered thyristors in the stator phases of a wye-connected machine. In this paper, an analytic method for predicting the steady-state

T.A. Lipo

1971-01-01

43

Abstract--Cascaded nonlinear predictive controller for induction motor drive is presented. The load torque,  

E-print Network

Abstract-- Cascaded nonlinear predictive controller for induction motor drive is presented. The load torque, considered as an unknown disturbance, is rejected using a disturbance observer. First, a nonlinear multivariable predictive controller is applied to track electromagnetic torque and rotor flux norm

Paris-Sud XI, Université de

44

Robust control using neural network uncertainty observer for linear induction motor servo drive  

Microsoft Academic Search

A robust controller, that combines the merits of integral-proportional (IP) position control and neural network (NN) observed technique, is designed for a linear induction motor (LIM) servo drive in this study. First, the secondary flux of the LIM is estimated using a sliding-mode flux observer on the stationary reference frame and the feedback linearization theory is used to decouple the

Faa-Jeng Lin; Rong-Jong Wai

2002-01-01

45

Study and simulation of space vector PWM control of double-star induction motors  

Microsoft Academic Search

This paper deals with a comparison between different structures of double-star induction motors (DSIMs), controlled by space vector PWM. The modelling of the DSIM is made using an arbitrary shift angle between the two three-phase windings. A new transformation matrix is proposed to develop a suitable dynamic model and to elaborate the space vector PWM control strategy for different values

D. Hadiouche; H. Razik; A. Rezzoug

2000-01-01

46

Demystifying induction motor behavior  

Microsoft Academic Search

Induction motors are very simple devices, but, ever since they were introduced by Tesla, they have mystified many practicing engineers. The INSPEC interactive program that runs in Microsoft Windows on 386 or higher PCs, is designed to calculate accurate equivalent circuit models from induction motor standard specifications. It has a full graphical user interface (GUI), created using Microsoft's Visual Basic.

Graham J. Rogers

1994-01-01

47

A double winding linear induction motor control scheme for PRT system  

Microsoft Academic Search

To increase fault tolerance, a double winding linear induction motor (LIM) is proposed for personal rapid transit (PRT) system. In the double winding LIM, two sets of windings are wound in a single yoke, and each of them are controlled by separate inverters. Therefore, the flux continuity must be provided in the region where the two windings are overlaid. Providing

Gubae Kang; Bon-Gwan Gu; Sung-Yong Shin; Kwanghee Nam; Seong-Hwan Yoon; Tae-Kyung Shin

2002-01-01

48

Speed sensorless vector control of induction motor using extended Kalman filter  

Microsoft Academic Search

A vector control of an induction motor by an estimated speed using an extended Kalman filter is proposed. With this method, the states are composed of stator current and rotor flux. The rotor speed is regarded as a parameter, and the composite states consist of the original states and the rotor speed. The extended Kalman filter is employed to identify

Young-Real Kim; Seung-Ki Sul; Min-Ho Park

1994-01-01

49

The universal field oriented (UFO) controller applied to wide speed range induction motor drives  

Microsoft Academic Search

The principle of the universal field-oriented (UFO) controller operating in an arbitrary reference frame is applied to a PWM inverter feeding a standard induction motor. An alternative synchronous current regulator is proposed that provides quick current response during transient torque conditions, that has the capability to transition to six-step operation, and that is characterized by a low harmonic current content

F. Profumo; A. Tenconi; R. W. De Doncker

1991-01-01

50

Evaluation of induction motor performance using an electronic power factor controller  

NASA Technical Reports Server (NTRS)

The concept of reducing the losses in an induction motor by electronically controlling the time interval between the zero crossing of the applied voltage and the zero crossing of the armature current was evaluated. The effect on power losses and power factor of reducing the applied sinusoidal voltages below the rated value was investigated experimentally. The reduction in power losses was measured using an electronic controller designed and built at MSFC. Modifications to the MSFC controller are described as well as a manually controlled electronic device which does not require that the motor be wye connected and the neutral available. Possible energy savings are examined.

1978-01-01

51

A New Quick-Response and High-Efficiency Control Strategy of an Induction Motor  

Microsoft Academic Search

New quick-response and high-efficiency control of an induction motor, which is quite different from that of the field-oriented control is proposed. The most obvious differences between the two are as follows. 1) The proposed scheme is based on limit cycle control of both flux and torque using optimum PWM output voltage; a switching table is employed for selecting the optimum

Isao Takahashi; Toshihiko Noguchi

1986-01-01

52

On the energy optimized control of standard and high-efficiency induction motors in CT and HVAC applications  

Microsoft Academic Search

This paper contains an analysis of how the choice of energy optimal control of induction motors is influenced by motor construction, standard versus high-efficiency motor, and by application, constant torque (CT) and heating, ventilation, and air conditioning (HVAC) (interpreted as vector and scalar motor drives). The analysis is made with a 2.2 kW voltage-source-inverter-fed squirrel-cage motor drive as an example

Flemming Abrahamsen; Frede Blaabjerg; John K. Pedersen; Pawel Z. Grabowski; P. Thoegersen

1998-01-01

53

Robust vector control of induction motors using full-order observer in consideration of core loss  

Microsoft Academic Search

This paper proposes a method for designing a robust full-order observer for vector-controlled induction motors taking core loss into account. Although conventional research focuses on parameter identification, global stability of the identification remains questionable. Therefore, robustness against some parameters is required. This paper describes the design of a robust full-order observer which takes core loss into account, using both the

Masaru Hasegawa; Shinichi Furutani; Shinji Doki; Shigeru Okuma

2003-01-01

54

Robust vector control of induction motor using full-order observer in consideration of core loss  

Microsoft Academic Search

This paper proposes a method for designing a robust full-order observer for vector-controlled induction motors taking core loss into account.. Although most of the literature focuses on parameter identification, the global stability of the identification remains questionable. There is therefore a need for robustness with respect, to some parameters. This paper describes the design of a robust full-order observer which

Masaru Hasegawa; Shinichi Furutani; Shinji Doki; Shigeru Okuma

2002-01-01

55

Method and apparatus for pulse width modulation control of an AC induction motor  

DOEpatents

An inverter is connected between a source of DC power and a three-phase AC induction motor, and a micro-processor-based circuit controls the inverter using pulse width modulation techniques. In the disclosed method of pulse width modulation, both edges of each pulse of a carrier pulse train are equally modulated by a time proportional to sin .THETA., where .THETA. is the angular displacement of the pulse center at the motor stator frequency from a fixed reference point on the carrier waveform. The carrier waveform frequency is a multiple of the motor stator frequency. The modulated pulse train is then applied to each of the motor phase inputs with respective phase shifts of 120.degree. at the stator frequency. Switching control commands of electronic switches in the inverter are stored in a random access memory (RAM) and the locations of the RAM are successively read out in a cyclic manner, each bit of a given RAM location controlling a respective phase input of the motor. The DC power source preferably comprises rechargeable batteries and all but one of the electronic switches in the inverter can be disabled, the remaining electronic switch being part of a "flyback" DC-DC converter circuit for recharging the battery.

Geppert, Steven (Bloomfield Hills, MI); Slicker, James M. (Union Lake, MI)

1984-01-01

56

Method and apparatus for pulse width modulation control of an AC induction motor  

NASA Technical Reports Server (NTRS)

An inverter is connected between a source of DC power and a three-phase AC induction motor, and a micro-processor-based circuit controls the inverter using pulse width modulation techniques. In the disclosed method of pulse width modulation, both edges of each pulse of a carrier pulse train are equally modulated by a time proportional to sin .THETA., where .THETA. is the angular displacement of the pulse center at the motor stator frequency from a fixed reference point on the carrier waveform. The carrier waveform frequency is a multiple of the motor stator frequency. The modulated pulse train is then applied to each of the motor phase inputs with respective phase shifts of 120.degree. at the stator frequency. Switching control commands of electronic switches in the inverter are stored in a random access memory (RAM) and the locations of the RAM are successively read out in a cyclic manner, each bit of a given RAM location controlling a respective phase input of the motor. The DC power source preferably comprises rechargeable batteries and all but one of the electronic switches in the inverter can be disabled, the remaining electronic switch being part of a flyback DC-DC converter circuit for recharging the battery.

Geppert, Steven (Inventor); Slicker, James M. (Inventor)

1984-01-01

57

Deadbeat flux level control of direct-field-oriented high-horsepower induction servo motor using adaptive rotor flux observer  

Microsoft Academic Search

A method for the deadbeat flux level control of direct-field-oriented high-power induction servo motor drives has been developed that employs an adaptive rotor flux observer. The observer is a full-order type and is used not only in the direct-field-oriented controller, but also to determine the stator and rotor resistances of the servo motor. The observer reduces the sensitivity of a

Lipei Huang; Yasuki Tadokoro; Kouki Matsuse

1994-01-01

58

An improved fault-tolerant control scheme for PWM inverter-fed induction motor-based EVs.  

PubMed

This paper proposes an improved fault-tolerant control scheme for PWM inverter-fed induction motor-based electric vehicles. The proposed strategy deals with power switch (IGBTs) failures mitigation within a reconfigurable induction motor control. To increase the vehicle powertrain reliability regarding IGBT open-circuit failures, 4-wire and 4-leg PWM inverter topologies are investigated and their performances discussed in a vehicle context. The proposed fault-tolerant topologies require only minimum hardware modifications to the conventional off-the-shelf six-switch three-phase drive, mitigating the IGBTs failures by specific inverter control. Indeed, the two topologies exploit the induction motor neutral accessibility for fault-tolerant purposes. The 4-wire topology uses then classical hysteresis controllers to account for the IGBT failures. The 4-leg topology, meanwhile, uses a specific 3D space vector PWM to handle vehicle requirements in terms of size (DC bus capacitors) and cost (IGBTs number). Experiments on an induction motor drive and simulations on an electric vehicle are carried-out using a European urban driving cycle to show that the proposed fault-tolerant control approach is effective and provides a simple configuration with high performance in terms of speed and torque responses. PMID:23916869

Tabbache, Bekhera; Benbouzid, Mohamed; Kheloui, Abdelaziz; Bourgeot, Jean-Matthieu; Mamoune, Abdeslam

2013-11-01

59

A linear induction motor conveyer  

E-print Network

for Various Conveyers Page 85 10$ LIST OF FIGURES Number 1. Two basic types of linear induction motors. I age 2. An early ancestor of' the linear induction motor 3. Forerunner of present day concepts for linear motor powered rail transportation... about by end turns, ii1umb sr pa. ge 34. Currents in the stator and the magnetic field at t ? 0. . . . . . , . . . , . . . . . . . . . . . . . . . . . Diagram for determining relative amount of induced voltage. 52 36. Second right hand. rule 5 3...

Solinsky, Kenneth Sheldon

2012-06-07

60

A Pulsewidth Modulated Control of Induction Motor Drive Using Multilevel 12-Sided Polygonal Voltage Space Vectors  

Microsoft Academic Search

In this paper, a novel 12-sided polygonal space vector structure is proposed for an induction motor drive. The space vector pattern presented in this paper consists of two 12-sided concentric polygons with the outer polygon having a radius double the inner one. As compared to previously reported 12-sided polygonal space vector structures, this paper subdivides the space vector plane into

Anandarup Das; K. Sivakumar; Rijil Ramchand; Chintan Patel; K. Gopakumar

2009-01-01

61

Analysis of field-oriented controlled induction motor drives under sensor faults and an overview of sensorless schemes.  

PubMed

To obtain high dynamic performance on induction motor drives (IMD), variable voltage and variable frequency operation has to be performed by measuring speed of rotation and stator currents through sensors and fed back them to the controllers. When the sensors are undergone a fault, the stability of control system, may be designed for an industrial process, is disturbed. This paper studies the negative effects on a 12.5 hp induction motor drives when the field oriented control system is subjected to sensor faults. To illustrate the importance of this study mine hoist load diagram is considered as shaft load of the tested machine. The methods to recover the system from sensor faults are discussed. In addition, the various speed sensorless schemes are reviewed comprehensively. PMID:24981890

Arun Dominic, D; Chelliah, Thanga Raj

2014-09-01

62

Load effects on Nola-type induction motor power-factor controllers on fuel-cell inverters  

NASA Astrophysics Data System (ADS)

Tests performed on power inverters using Nola-type power factor controllers (PFC) and fractional horsepower single phase induction motors as loading devices are discussed. The inverters were designed for integral operation with fuel cell power plants and represented four differential developmental designs ranging in power ratings from 1.5 kW to 5 kW. In addition, a 1000 VA commercial aircraft-type inverter was also tested. Results are presented and discussed.

1982-12-01

63

Electric vehicle motors and controllers  

NASA Technical Reports Server (NTRS)

Improved and advanced components being developed include electronically commutated permanent magnet motors of both drum and disk configuration, an unconventional brush commutated motor, and ac induction motors and various controllers. Test results on developmental motors, controllers, and combinations thereof indicate that efficiencies of 90% and higher for individual components, and 80% to 90% for motor/controller combinations can be obtained at rated power. The simplicity of the developmental motors and the potential for ultimately low cost electronics indicate that one or more of these approaches to electric vehicle propulsion may eventually displace presently used controllers and brush commutated dc motors.

Secunde, R. R.

1981-01-01

64

Identification of induction motor parameters  

Microsoft Academic Search

In this paper, a model-based mapping identification concept is used to identify the unknown parameters of induction motors using transient dynamics. The reported state-space identification scheme can be applied to a wide class of nonlinear multivariable continuous-time dynamic systems. To illustrate the analytical results and to demonstrate the practical capabilities, the unknown motor parameters are identified for a voltage-fed squirrel-cage

V. Pappanol; S. E. Lyshevski; B. Friedland

1998-01-01

65

Segmented rail linear induction motor  

SciTech Connect

A segmented rail linear induction motor has a segmented rail consisting of a plurality of nonferrous electrically conductive segments aligned along a guideway. The motor further includes a carriage including at least one pair of opposed coils fastened to the carriage for moving the carriage. A power source applies an electric current to the coils to induce currents in the conductive surfaces to repel the coils from adjacent edges of the conductive surfaces.

Cowan, Jr., Maynard (1107 Stagecoach Rd. SE., Albuquerque, NM 87123); Marder, Barry M. (1412 Pinnacle View Dr. NE., Albuquerque, NM 87123)

1996-01-01

66

Segmented rail linear induction motor  

DOEpatents

A segmented rail linear induction motor has a segmented rail consisting of a plurality of nonferrous electrically conductive segments aligned along a guideway. The motor further includes a carriage including at least one pair of opposed coils fastened to the carriage for moving the carriage. A power source applies an electric current to the coils to induce currents in the conductive surfaces to repel the coils from adjacent edges of the conductive surfaces. 6 figs.

Cowan, M. Jr.; Marder, B.M.

1996-09-03

67

Dynamic emulation of mechanical loads using a vector-controlled induction motor-generator set  

Microsoft Academic Search

This paper addresses the problem of electronic emulation of both linear and nonlinear mechanical loads using a vector-controlled induction machine dynamometer. It is shown that a basic emulation scheme where the dynamometer torque demand is derived from the inverse dynamics of the emulated load is not generally viable, especially if the emulated load is part of a closed-loop speed control

Z. Hakan Akpolat; Greg M. Asher; Jon C. Clare

1999-01-01

68

Induction motor encoderless control associated to a sinus filter for industrial high power application  

Microsoft Academic Search

This paper deals with the control of a medium voltage 3 level inverter supplying a high speed induction machine via a Sinus filter. The sinus filter dynamic impacts the global model, and induce a resonance frequency, that has to be managed to ensure the global stability. Two control methods are presented with site experimental results of 6 MW 10000 rpm

F. Terrien; S. Siala

2009-01-01

69

Sensorless performance evaluation of induction motors  

E-print Network

In this thesis, various aspects of induction motor performance are discussed. The importance of the speed-torque curve for an induction motor system and its various applications are emphasized. Difficulties in the presently available methods...

Ahmed, Shehab

2000-01-01

70

Motor Controllers  

NASA Technical Reports Server (NTRS)

Kollmorgen Corporation's Mermaid II two person submersible is propeller-driven by a system of five DC brushless motors with new electronic controllers that originated in work performed in a NASA/DOE project managed by Lewis Research Center. A key feature of the system is electric commutation rather than mechanical commutation for converting AC current to DC.

1984-01-01

71

Performance Evaluation and Slip Regulation Control of an Asymmetrical Parameter Type Two-Phase Induction Motor Drive Using a Three-Leg Voltage Source Inverter  

NASA Astrophysics Data System (ADS)

This paper presents a performance evaluation and a simple speed control method of an asymmetrical parameter type two-phase induction motor drive using a three-leg VSI (Voltage Source Inverter). The two-phase induction motor is adapted from an existing single-phase induction motor resulting in impedance unbalance between main and auxiliary windings. The unbalanced two-phase inverter outputs with orthogonal displacement based on a SPWM (Sinusoidal Pulse Width Modulation) method are controlled with appropriate amplitudes for improving the motor performance. Dynamic simulation of the proposed drive system is given. A simple speed controller based on a slip regulation method is designed. The overall system is implemented on a DSP (Digital Signal Processor) board. The validity of the proposed system is verified by simulation and experimental results.

Piyarat, Wekin; Kinnares, Vijit

72

Design and Control Techniques for Extending High Frequency Operation of a CSI Induction Motor Drive  

Microsoft Academic Search

An investigation of the maximum speed capability of a current source inverter (CSI) drive in both a three-and a six-phase connection is presented. It is shown that a six-phase configuration has distinct advantages over a three-phase connection in high speed capability for the same peak motor spike voltages. In addition, with proper control of the firing pulses fed to the

Thomas A. Lipo; Loren H. Walker

1983-01-01

73

Real-Time Induction Motor Speed Control with a Feedback Utilizing Power Line Communications and a Motor Feeder Cable in Data Transmission  

Microsoft Academic Search

In a motor speed control, a feedback loop is used to transfer the measured motor rotational speed information to the controller. The implementation of the feedback loop requires cabling between the motor and the frequency converter both for signalling and powering. However, the motor feeder cable could be used as a medium for data transmission. A feedback loop that utilizes

Antti Kosonen; Markku Jokinen; Jero Ahola; Markku Niemel

2006-01-01

74

A test platform for measuring the energy efficiency of AC induction motors under various loading conditions and control schemes/  

E-print Network

A test platform was developed to measure and compare the energy efficiency of an AC induction motor under steady-state and cyclical loading conditions while operating in both a constant speed mode and while performing speed ...

Granata, John A. (John Anthony)

2012-01-01

75

Fault Tolerant Control for Induction Motors using Sliding Mode N. DJEGHALI, M. GHANES, M. TADJINE, S. DJENNOUNE and J. P. BARBOT  

E-print Network

Fault Tolerant Control for Induction Motors using Sliding Mode Observers N. DJEGHALI, M. GHANES, M. TADJINE, S. DJENNOUNE and J. P. BARBOT Abstract-- In this paper a fault tolerant control design based and reconstruct the faults and also to estimate the flux. Then, additional control laws based on the estimates

Paris-Sud XI, Université de

76

Constant Horsepower Operation of Induction Motors  

Microsoft Academic Search

As an electromechanical transducer, the squirrel-cage induction motor is simple and rugged. With variable-frequency inverters it is possible to operate an induction motor over a wide range of speeds, supplying a constant horsepower load. Performance is a function of sizing of motors and sizing of inverters. These relationships are explored on a fundamental basis.

Andrew J. Humphrey

1969-01-01

77

Harmonic Effects in Electrostatic Induction Motors  

Microsoft Academic Search

Electrostatic Induction motors are closely connected in theory to the familiar Tesla induction machine. In practice, designs are constrained by dielectric breakdown. Stator and rotor electrodes must be positioned to avoid breakdown rather than to provide sinusoidal distributions. The result is that Space and time harmonics are important in electrostatic machines. A cylindrical and in experimental electrostatic Induction motor is

Philip T. Krein; Joseph M. Crowley

1985-01-01

78

Fast Fourier and discrete wavelet transforms applied to sensorless vector control induction motor for rotor bar faults diagnosis.  

PubMed

This paper presents new techniques to evaluate faults in case of broken rotor bars of induction motors. Procedures are applied with closed-loop control. Electrical and mechanical variables are treated using fast Fourier transform (FFT), and discrete wavelet transform (DWT) at start-up and steady state. The wavelet transform has proven to be an excellent mathematical tool for the detection of the faults particularly broken rotor bars type. As a performance, DWT can provide a local representation of the non-stationary current signals for the healthy machine and with fault. For sensorless control, a Luenberger observer is applied; the estimation rotor speed is analyzed; the effect of the faults in the speed pulsation is compensated; a quadratic current appears and used for fault detection. PMID:25004798

Talhaoui, Hicham; Menacer, Arezki; Kessal, Abdelhalim; Kechida, Ridha

2014-09-01

79

Evolution of induction motors-the ever-shrinking motor  

Microsoft Academic Search

The induction motor was invented in the 1880s by Nikola Tesla, and is basically unchanged 100 years later. But there have been tremendous changes. One of the most notable is the change in physical size. Progress in induction motors, spurred by keen competition, has been notable. One indication of this progress is the change in specific weight (pounds of material

R. Browning

1997-01-01

80

Pulsed linear induction motors in Maglev applications  

Microsoft Academic Search

Linear induction and synchronous motors have been the favored approaches for achieving linear propulsion in the Maglev community. One alternative is PLIM, a less conventional pulsed linear induction motor. Among the advantages realized through PLIM are elimination of low power factor power transfer, smaller end winding overhang, and simpler electronics. Examined in this document are various embodiments of this approach

K. Davey

2000-01-01

81

Independent Control of Two Induction Motors Fed by a Five Legs PWM Inverter for Electric Vehicles  

E-print Network

occupy an important place in industry applications such as electric powertrain, textile paper industries of power electronic devices required in multi-motor drive systems, to reduce the overall complexity

Boyer, Edmond

82

A novel variable-frequency three-phase induction motor drive system using only three controlled switches  

Microsoft Academic Search

This paper presents a novel variable-frequency motor drive system for a three-phase induction machine. In this drive system, the machine is excited by unidirectional stator currents shaped and sequenced such that a rotating air-gap flux is induced so that the machine can operate. Due to the unidirectional nature of the currents, an \\

Brian A. Welchko; Thomas A. Lipo

2001-01-01

83

Experimental implementation of a robust damped-oscillation control algorithm on a full-sized, two-degree-of-freedom, AC induction motor-driven crane  

NASA Astrophysics Data System (ADS)

When suspended payloads are moved with an overhead crane, pendulum like oscillations are naturally introduced. This presents a problem any time a crane is used, especially when expensive and/or delicate objects are moved, when moving in a cluttered and/or hazardous environment, and when objects are to be placed in tight locations. Damped-oscillation control algorithms have been demonstrated over the past several years for laboratory-scale robotic systems on dc motor-driven overhead cranes. Most overhead cranes presently in use in industry are driven by ac induction motors; consequently, Oak Ridge National Laboratory has implemented damped-oscillation crane control on one of its existing facility ac induction motor-driven overhead cranes. The purpose of this test was to determine feasibility, to work out control and interfacing specifications, and to establish the capability of newly available ac motor control hardware with respect to use in damped-oscillation-controlled systems. Flux vector inverter drives are used to investigate their acceptability for damped-oscillation crane control. The purpose of this paper is to describe the experimental implementation of a control algorithm on a full-sized, two-degree-of-freedom, industrial crane; describe the experimental evaluation of the controller including robustness to payload length changes; explain the results of experiments designed to determine the hardware required for implementation of the control algorithms; and to provide a theoretical description of the controller.

Kress, R. L.; Jansen, J. F.; Noakes, M. W.

84

Transistorized PWM inverter-induction motor drive system  

NASA Astrophysics Data System (ADS)

This paper describes the development of a transistorized PWM inverter-induction motor traction drive system. A vehicle performance analysis was performed to establish the vehicle tractive effort-speed requirements. These requirements were then converted into a set of inverter and motor specifications. The inverter was a transistorized three-phase bridge using General Electric power Darlington transistors. The description of the design and development of this inverter is the principal object of this paper. The high-speed induction motor is a design which is optimized for use with an inverter power source. The primary feedback control is a torque angle control with voltage and torque outer loop controls. A current-controlled PWM technique is used to control the motor voltage. The drive has a constant torque output with PWM operation to base motor speed and a constant horsepower output with square wave operation to maximum speed. The drive system was dynamometer tested and the results are presented.

Peak, S. C.; Plunkett, A. B.

1982-10-01

85

Performance Optimization of Induction Motor-Pump System Using Photovoltaic Energy Source  

Microsoft Academic Search

The optimization of a photovoltaic pumping system based on an induction motor driven pump that is powered by a solar array is presented in this paper. The motor-pump subsystem is analyzed from the point of view of optimizing the power requirement of the induction motor, which has led to an optimum u-f relationship useful in controlling the motor. The complete

S. R. Bhat; Andre Pittet; B. S. Sonde

1987-01-01

86

Compensation Performance for Induction Motor Load of Voltage Dip Compensator  

NASA Astrophysics Data System (ADS)

The variable speed drives of the power electronics application are the most sensitive to the voltage dip that is caused by power system fault. Variable speed drives are composed by the converter, the voltage source inverter and induction motor. They could fall into operation failure by wrong control in the converter when degree of the voltage dip exceeds 15% and 10ms. Therefore, important loads are equipped with the voltage dip compensation. Since the load characteristic of the converter equals nearly the impedance load, the induction motors connected directly to power supply are more sensitive to the output voltage waveform of the compensator than the converter. Thus, the induction motors are used as the important load (compensated load) on the simulation. The simulations of the compensation performance to the induction motors are carried out by using simulation tool PSCAD/EMTDC. It is confirmed that the goal of the compensation performance is able to be achieved.

Nagamoto, Takamichi; Takayama, Katsumi; Kai, Takaaki

87

Control algorithm for the inverter fed induction motor drive with DC current feedback loop based on principles of the vector control  

SciTech Connect

This paper brings out a control algorithm for VSI fed induction motor drives based on the converter DC link current feedback. It is shown that the speed and flux can be controlled over the wide speed and load range quite satisfactorily for simpler drives. The base commands of both the inverter voltage and frequency are proportional to the reference speed, but each of them is further modified by the signals derived from the DC current sensor. The algorithm is based on the equations well known from the vector control theory, and is aimed to obtain the constant rotor flux and proportionality between the electrical torque, the slip frequency and the active component of the stator current. In this way, the problems of slip compensation, Ri compensation and correction of U/f characteristics are solved in the same time. Analytical considerations and computer simulations of the proposed control structure are in close agreement with the experimental results measured on a prototype drive.

Vuckovic, V.; Vukosavic, S. (Electrical Engineering Inst. Nikola Tesla, Viktora Igoa 3, Belgrade, 11000 (Yugoslavia))

1992-01-01

88

The history of induction motors in America  

Microsoft Academic Search

This paper briefly reviews the history of the induction motor from its invention by Nicola Tesla in 1888 through the various stages of its development-the invention of the cast aluminum squirrelcage winding, improvements in magnetic steel and insulation, and the progressive reduction of the dimensions for a given horsepower rating, so that today a 100-hp motor has the same mounting

P. L. Alger; R. E. Arnold

1976-01-01

89

Nonlocal action in the induction motor  

Microsoft Academic Search

It is pointed out that local field-contact action depends entirely on field-energy momentum transfer to matter, orvice versa. Contact with stationary electromagnetic energy does not produce forces. With this in mind, the paper examines the electrodynamic operation of the common induction motor and concludes that the motor is not, and could not be, driven by local field-contact action.

Peter Graneau

1991-01-01

90

An extended Kalman filter approach to rotor time constant measurement in PWM induction motor drives  

Microsoft Academic Search

A rotor time constant estimation technique for the purpose of updating the control gains of an induction motor field-oriented controller is described. An extended Kalman filter is employed to estimate the inverse rotor time constant online only using measurements of the stator voltages and currents and rotor speed of an induction motor. The motor is driven by a pulsewidth modulated

Li-Cheng Zai; Christopher L. DeMarco; Thomas A. Lipo

1992-01-01

91

Load Characteristics of Induction Motor Manufactured by Soft Magnetic Composite  

Microsoft Academic Search

The load characteristics of induction motor manufactured by soft magnetic composite (SMC) are presented. We manufactured three kinds of induction motors experimentally. One is a conventional laminated iron core motor. The others are SMC motors. One of the SMC motor uses SMC only for stator, while the other SMC motor uses SMC for stator and rotor. The experimental comparisons of

Tomohiro Fukuda; Yutaka Sasaki; Masayuki Morimoto

2009-01-01

92

Circuit-Based Induction Motor Drive Reliability under Different Control Schemes and Safe-Mode Operation  

E-print Network

, e.g., vehicles, aircraft oil pumps, and driving conveyors, require careful designs for safety. This prevents damage to an experimental setup; allow easy controller replacement and automation of the fault impact assessment. To simultaneously study physical effects and fault transients in the machine, power

Liberzon, Daniel

93

Study and Simulation of Direct Torque Control of Double-Star Induction Motor Drive  

Microsoft Academic Search

The major drawback of usual dual three-phase AC machines when supplied by a voltage source inverter (VSI), is the occurrence of extra harmonic currents. These extra currents circulate only in the stator windings and cause additional losses. One solution to reduce their amplitude is to act on the supply side using dedicated PWM control strategies. In this paper, we present

Khoudir Marouani; Farid Khoucha; Abdelaziz Kheloui; Lotfi Baghli; Djafar Hadiouche

2006-01-01

94

DTC Based Induction Motor Speed Control Using 10-Sector Methodology for Torque Ripple Reduction  

NASA Astrophysics Data System (ADS)

A direct torque control (DTC) drive allows direct and independent control of flux linkage and electromagnetic torque by the selection of optimum inverter switching modes. It is a simple method of signal processing which gives excellent dynamic performance. Also transformation of coordinates and voltage decoupling are not required. However, the possible discrete inverter switching vectors cannot always generate exact stator voltage required, to obtain the demanded electromagnetic torque and flux linkages. This results in the production of ripples in the torque as well as flux waveforms. In the present paper a torque ripple reduction methodology is proposed. In this method the circular locus of flux phasor is divided into 10 sector as compared to six sector divisions in conventional DTC method. The basic DTC scheme and the 10-sector method are simulated and compared for their performance. An analysis is done with sector increment so that finally the torque ripple varies slightly as the sector is increased.

Pavithra, S.; Dinesh Krishna, A. S.; Shridharan, S.

2014-09-01

95

Design two degree of linear motion X-Y plane machine using linear induction motor  

Microsoft Academic Search

This paper introduces a review of the two basic designs of linear induction motor (LIM). Two designs (single side and double sided) are introduced. The modeling of the LIM is given as relations between the variables and the motor parameters. The control techniques for the motor are given. The problems from which the motor suffers due to the construction and

A. F. A. El-Halim; M. A. Ashraf; I. F. Al-Arabawy

2008-01-01

96

Induction Motors Bearing Failures Detection and Diagnosis  

E-print Network

331 1 Induction Motors Bearing Failures Detection and Diagnosis Using a RBF ANN Park Pattern Based Method I. Y. ?nel, I. enol and M. E. H. Benbouzid Abstract--This paper deals with the problem of bearing detection and diagnosis process. Experimental tests with artificial bearing damages results show

Boyer, Edmond

97

Observers for induction motor state and parameter estimation  

Microsoft Academic Search

The Kalman filter in its basic form is a state estimator and can be applied to the problem of estimating induction motor rotor currents in a vector control scheme. This filter is shown to combine information from the plant model with output measurements to produce an optimal estimate of the unmeasured states. Also described is the application of the extended

David J. Atkinson; Paul P. Acarnley; John W. Finch

1991-01-01

98

Stepping motor controller  

DOEpatents

A stepping motor is microprocessor controlled by digital circuitry which monitors the output of a shaft encoder adjustably secured to the stepping motor and generates a subsequent stepping pulse only after the preceding step has occurred and a fixed delay has expired. The fixed delay is variable on a real-time basis to provide for smooth and controlled deceleration.

Bourret, S.C.; Swansen, J.E.

1982-07-02

99

Stepping motor controller  

DOEpatents

A stepping motor is microprocessingly controlled by digital circuitry which monitors the output of a shaft encoder adjustably secured to the stepping motor and generates a subsequent stepping pulse only after the preceding step has occurred and a fixed delay has expired. The fixed delay is variable on a real-time basis to provide for smooth and controlled deceleration.

Bourret, Steven C. (Los Alamos, NM); Swansen, James E. (Los Alamos, NM)

1984-01-01

100

Abstract--Controlling induction motors have been given a great deal of interest. Generally, the control issue has been  

E-print Network

is considered together with its AC/DC/AC converter. The control objectives for the association `converter-machine at hand is to design a controller ensuring a wide speed range regulation for the system including the AC and ignoring the presence of the AC/DC/AC converter. The originality of the present work is twofold: (i

Paris-Sud XI, Université de

101

Nonlinear identification of induction motor parameters  

Microsoft Academic Search

In this paper, a nonlinear mapping identification concept is applied to identify the unknown parameters of induction motors using transient dynamics. The developed identification algorithm has significant advantages due to computational efficiency, robustness and convergence, reliability and feasibility. The reported model-based state-space identification can be applied to a wide class of nonlinear multivariable continuous-time dynamic systems. To illustrate the analytical

V. Pappano; S. E. Lyshevski; B. Friedland

1999-01-01

102

Tracking the Rotor Time Constant of an Induction Motor Traction Drive for HEVs  

E-print Network

1 Tracking the Rotor Time Constant of an Induction Motor Traction Drive for HEVs Kaiyu Wang, John of TR as it changes due to Ohmic heating so that an ac- curate value is available to estimate the rotor­ Induction Motor, Rotor Time Constant, Pa- rameter Identification I. Introduction The field-oriented control

Tolbert, Leon M.

103

Load Characteristics of Induction Motor Manufactured by Soft Magnetic Composite  

NASA Astrophysics Data System (ADS)

The load characteristics of induction motor manufactured by soft magnetic composite (SMC) are presented. We manufactured three kinds of induction motors experimentally. One is a conventional laminated iron core motor. The others are SMC motors. One of the SMC motor uses SMC only for stator, while the other SMC motor uses SMC for stator and rotor. The experimental comparisons of load characteristics and loss analysis are shown. As a result, the difference between the efficiency of the SMC motor and the conventional laminated motor is 4.6%, in spite of the permeability of SMC being 20% lower than the conventional electromagnetic steel.

Fukuda, Tomohiro; Sasaki, Yutaka; Morimoto, Masayuki

104

Motor control for a brushless DC motor  

NASA Technical Reports Server (NTRS)

This invention relates to a motor control system for a brushless DC motor having an inverter responsively coupled to the motor control system and in power transmitting relationship to the motor. The motor control system includes a motor rotor speed detecting unit that provides a pulsed waveform signal proportional to rotor speed. This pulsed waveform signal is delivered to the inverter to thereby cause an inverter fundamental current waveform output to the motor to be switched at a rate proportional to said rotor speed. In addition, the fundamental current waveform is also pulse width modulated at a rate proportional to the rotor speed. A fundamental current waveform phase advance circuit is controllingly coupled to the inverter. The phase advance circuit is coupled to receive the pulsed waveform signal from the motor rotor speed detecting unit and phase advance the pulsed waveform signal as a predetermined function of motor speed to thereby cause the fundamental current waveform to be advanced and thereby compensate for fundamental current waveform lag due to motor winding reactance which allows the motor to operate at higher speeds than the motor is rated while providing optimal torque and therefore increased efficiency.

Peterson, William J. (Inventor); Faulkner, Dennis T. (Inventor)

1985-01-01

105

Method and apparatus for monitoring the rotating frequency of de-energized induction motors  

DOEpatents

The rotational speed of a coasting induction motor is measured by sensing e residual electrical voltages at the power terminals of the motor, thus eliminating the need for conventional tachometer equipment, additional mechanical components or modifications to the induction motor itself. The power terminal voltage signal is detected and transformed into a DC voltage proportional to the frequency of the signal. This DC voltage can be input to the control system of a variable frequency motor controller to regulate the output characteristics thereof relative to the speed of the coasting motor. 6 figs.

Mikesell, H.E.; Lucy, E.

1998-02-03

106

Method and apparatus for monitoring the rotating frequency of de-energized induction motors  

DOEpatents

The rotational speed of a coasting induction motor is measured by sensing e residual electrical voltages at the power terminals of the motor, thus eliminating the need for conventional tachometer equipment, additional mechanical components or modifications to the induction motor itself. The power terminal voltage signal is detected and transformed into a DC voltage proportional to the frequency of the signal. This DC voltage can be input to the control system of a variable frequency motor controller to regulate the output characteristics thereof relative to the speed of the coasting motor.

Mikesell, Harvey E. (McMurray, PA); Lucy, Eric (Murrysville, PA)

1998-01-01

107

Bibliography on Induction Motors Faults Detection and Diagnosis  

E-print Network

Bibliography on Induction Motors Faults Detection and Diagnosis M.E.H. Benbouzid, Member, IEEE and diagnosis techniques. However, performing reliable and accurate motor faults detection and diagnosis a comprehensive list of books, workshops, conferences, and journal papers related to induction motors faults

Brest, Université de

108

Iterative Solution of Maxwell's Equations for an Induction Motor  

E-print Network

In this work we use classical electromagnetism to analyse a three-phase induction motor. We first cast the motor as a boundary value problem involving two phenomenological time-constants. These are derived from the widely used equivalent circuit model of the induction motor. We then use an iterative procedure to evaluate these constants and obtain the motor performance equations. Our results depend only on the geometrical parameters of the motor and can be used to derive precise expressions for the excitation frequency and applied voltage needed to extract maximum performance from a given motor at any rotation speed.

Shayak Bhattacharjee

2014-07-29

109

Lyapunov exponent for aging process in induction motor  

NASA Astrophysics Data System (ADS)

Nonlinear systems like electrical circuits and systems, mechanics, optics and even incidents in nature may pass through various bifurcations and steady states like equilibrium point, periodic, quasi-periodic, chaotic states. Although chaotic phenomena are widely observed in physical systems, it can not be predicted because of the nature of the system. On the other hand, it is known that, chaos is strictly dependent on initial conditions of the system [1-3]. There are several methods in order to define the chaos. Phase portraits, Poincar maps, Lyapunov Exponents are the most common techniques. Lyapunov Exponents are the theoretical indicator of the chaos, named after the Russian mathematician Aleksandr Lyapunov (1857-1918). Lyapunov Exponents stand for the average exponential divergence or convergence of nearby system states, meaning estimating the quantitive measure of the chaotic attractor. Negative numbers of the exponents stand for a stable system whereas zero stands for quasi-periodic systems. On the other hand, at least if one of the exponents is positive, this situation is an indicator of the chaos. For estimating the exponents, the system should be modeled by differential equation but even in that case mathematical calculation of Lyapunov Exponents are not very practical and evaluation of these values requires a long signal duration [4-7]. For experimental data sets, it is not always possible to acquire the differential equations. There are several different methods in literature for determining the Lyapunov Exponents of the system [4, 5]. Induction motors are the most important tools for many industrial processes because they are cheap, robust, efficient and reliable. In order to have healthy processes in industrial applications, the conditions of the machines should be monitored and the different working conditions should be addressed correctly. To the best of our knowledge, researches related to Lyapunov exponents and electrical motors are mostly focused on the controlling the mechanical parameters of the electrical machines. Brushless DC motor (BLDCM) and the other general purpose permanent magnet (PM) motors are the most widely examined motors [1, 8, 9]. But the researches, about Lyapunov Exponent, subjected to the induction motors are mostly focused on the control theory of the motors. Flux estimation of rotor, external load disturbances and speed tracking and vector control position system are the main research areas for induction motors [10, 11, 12-14]. For all the data sets which can be collected from an induction motor, vibration data have the key role for understanding the mechanical behaviours like aging, bearing damage and stator insulation damage [15-18]. In this paper aging of an induction motor is investigated by using the vibration signals. The signals consist of new and aged motor data. These data are examined by their 2 dimensional phase portraits and the geometric interpretation is applied for detecting the Lyapunov Exponents. These values are compared in order to define the character and state estimation of the aging processes.

Bayram, Duygu; nn, Sezen Y?d?r?m; ?eker, Serhat

2012-09-01

110

Design and comparison of linear synchronous motor and linear induction motor for electromagnetic aircraft launch system  

Microsoft Academic Search

Two basic linear motor designs suitable for an electromagnetic aircraft launch system (EMALS) have been presented in the paper. The motors have been designed with an emphasis on easy assembly and replacement even at the cost of slightly reduced performances. Both, linear permanent magnet synchronous motor (LPMSM) and linear induction motor (LIM) are assembled from modular stator segments which can

G. Stumberger; D. Zarko; M. Timur Aydemir; T.A. Lipo

2003-01-01

111

Optimization of induction motor efficiency: Volume 2, Single-phase induction motors: Final report  

SciTech Connect

The optimal design of the motor dimensions, the capacitance of the run capacitor, the winding distribution and the choice of the electrical steel are the most important sources for an improvement of the efficiency of modern single-phase induction motors for given performance and material cost constraints. The formulation of the techniques which realize this optimization is based on nonlinear programming approaches. The Method of Boundary Search Along Active Constraints is used for the optimal design of the motor dimensions of a commercially available 2 hp, 115 V single-phase induction motor. Based on the optimization results due to the above mentioned four optimization components, the relationships between efficiency, power factor, cost, active materials and the values of the capacitance of the run capacitor are studied and the limited validity of the model law is discussed. This report also explains why the Wanlass retrofit improves efficiency and details the advantages and disadvantages of such a retrofitting as compared with the operation in the standard configuration.

Fuchs, E.F.; Huang, H.; Vandenput, A.J.; Holl, J.; Appelbaum, J.; Zak, Z.; Erlicki, M.S.

1987-05-01

112

An Induction Motor Based Wind Turbine Emulator  

NASA Astrophysics Data System (ADS)

The authors present a small-scale wind turbine emulator based on the AC drive system and discuss the methods for power coefficient calculation. In the work, the experimental set-up consisting of an AC induction motor, a frequency converter, a synchronous permanent magnet generator, a DC-DC boost converter and DC load was simulated and tested using real-life equipment. The experimentally obtained wind turbine power and torque diagrams using the emulator are in a good agreement with the theoretical ones. aj? rakst? par?d?ta mazas jaudas v?ja turb?nas emulatora izveide ar mai?str?vas piedzi?as sist?mu, k? ar? analiz?tas vair?kas turb?nas jaudas koeficienta anal?tisk?s apr??ina metodes. V?ja turb?nas emulatora eksperiment?lais stends, kas sast?v no asinhron? elektromotora, frekven?u p?rveidot?ja, sinhron? past?v?go magn?tu ?eneratora, l?dzstr?vas paaugstino? p?rveidot?ja un slodzes, tika p?rbaud?ts gan simul?anas vid?, gan uz re?l?m iek?rt?m. Eksperiment?li ieg?t?s v?ja turb?nas emulatora jaudas un momenta diagrammas ir sal?dzin?tas ar teor?tiskaj?m.

Sokolovs, A.; Grigans, L.; Kamolins, E.; Voitkans, J.

2014-04-01

113

Swarm Intelligence Algorithm for Induction Motor Field Efficiency Evaluation  

NASA Astrophysics Data System (ADS)

Determining induction motor field efficiency is imperative in industries for energy conservation and cost savings. The induction motor efficiency is generally tested in a laboratories by certain methods defined in IEEE Standard - 112. But these methods cannot be used for motor efficiency evaluations in the field because it disrupts the production process of the industry. This paper proposes a swarm intelligence algorithm, Particle Swarm Optimization (PSO) for efficiency evaluation of in-service induction motor based on a modified induction motor equivalent circuit model. In this model, stray load losses are considered. The proposed efficiency evaluation method combines the PSO and the equivalent circuit method. First, the equivalent circuit parameters are estimated by minimizing the difference between measured and calculated values of stator current and input power of the motor using the PSO algorithm. Based on these parameters, the efficiency of the motor at various load points are evaluated by using the equivalent circuit method. To exemplify the performance of the PSO based efficiency estimation method, a 5 HP motor has been tested, compared with genetic algorithm (GA), torque gauge method, equivalent circuit method, slip method, current method and segregated loss method and found to be superior. Accordingly, the method will be useful for engineers who implement the energy efficiency programs to the electric motor systems in industries.

Sakthivel, V. P.; Subramanian, S.

114

Field Programmable Gate Array (FPGA) based neural network implementation of Motion Control and fault diagnosis of induction motor drive  

Microsoft Academic Search

In the last decade two things that has evolved and come into notice of motion control are programmable device technologies and AI techniques. This gives idea about lot more applications on single chip. This paper presents implementing of artificial neural networks based controller and fault diagnoses on field programmable gate array (FPGA). The feed forward neural network detects misfiring of

Subbarao Tatikonda; Pramod Agarwal

2008-01-01

115

An economical single to three phase converter for induction motors  

E-print Network

There are several different types of single to three phase converters for induction motors available today. However, many of the presently available phase converters suffer from disadvantages such as high cost or low performance. An economical...

Di Zerega, Philp Van Uytandaele

1994-01-01

116

New direct torque neuro-fuzzy control based SVM-three level inverter-fed induction motor  

Microsoft Academic Search

In this paper, a novel direct torque neuro-fuzzy control (DTCNF) scheme combining with space voltage modulation (SVM) technique\\u000a of a three levels inverter is presented. Using neuro-fuzzy technique, the reference space voltage vector can be obtained dynamically\\u000a in terms of torque error, stator flux error and the angle of stator flux. Compared with conventional direct torque control\\u000a (C_DTC), in this

Toufouti Riad; Benalla Hocine; Meziane Salima

2010-01-01

117

Heritability of motor control and motor learning  

PubMed Central

Abstract The aim of this study was to elucidate the relative contribution of genes and environment on individual differences in motor control and acquisition of a force control task, in view of recent association studies showing that several candidate polymorphisms may have an effect on them. Forty?four healthy female twins performed brisk isometric abductions with their right thumb. Force was recorded by a transducer and fed back to the subject on a computer screen. The task was to place the tracing of the peak force in a force window defined between 30% and 40% of the subject's maximum force, as determined beforehand. The initial level of proficiency was defined as the number of attempts reaching the force window criterion within the first 100 trials. The difference between the number of successful trials within the last and the first 100 trials was taken as a measure of motor learning. For motor control, defined by the initial level of proficiency, the intrapair differences in monozygotic (MZ) and dizygotic (DZ) twins were 6.8 7.8 and 13.8 8.4, and the intrapair correlations 0.77 and 0.39, respectively. Heritability was estimated at 0.68. Likewise for motor learning intrapair differences in the increment of the number of successful trials in MZ and DZ twins were 5.4 5.2 and 12.8 7, and the intrapair correlations 0.58 and 0.19. Heritability reached 0.70. The present findings suggest that heredity accounts for a major part of existing differences in motor control and motor learning, but uncertainty remains which gene polymorphisms may be responsible. PMID:24744865

Missitzi, Julia; Gentner, Reinhard; Misitzi, Angelica; Geladas, Nickos; Politis, Panagiotis; Klissouras, Vassilis; Classen, Joseph

2013-01-01

118

Load characteristics of induction motor made of Soft Magnetic Composite (SMC)  

Microsoft Academic Search

This paper presents experimental comparison of the load characteristics of soft magnetic composite (SMC) induction motor and conventional laminated induction motor. SMC is used for the stator core of induction motor. As the result, efficiency difference between SMC motor and conventional laminated motor is only 3.7% in spite of the permeability of SMC is 20% lower than conventional electromagnetic steel.

Tomohiro Fukuda; Masayuki Morimoto

2008-01-01

119

Sensorless Fault Tolerant Control for Induction Motors Nadia Djeghali, Malek Ghanes, Said Djennoune, and Jean Pierre Barbot  

E-print Network

is developed. In the proposed approach, a robust controller based on backstepping strategy is designed in order when faults occur. There are two types of FTC: active and passive approaches. In the active approach]. Many FDI and online monitoring approaches have been suggested for linear and nonlinear systems: model-based

Boyer, Edmond

120

Performance Analysis of Saturated Induction Motors by Virtual Tests  

ERIC Educational Resources Information Center

Many undergraduate-level electrical machines textbooks give detailed treatments of the performance of induction motors. Students can deepen this understanding of motor performance by performing the appropriate practical work in laboratories or in simulation using proper software packages. This paper considers various common and less-common tests

Ojaghi, M.; Faiz, J.; Kazemi, M.; Rezaei, M.

2012-01-01

121

Diagnosis of Speed Sensor Failure in Induction Motor Drive  

E-print Network

diagnosis technology of incipient faults for induction drives is rapidly emerging to avoid the unpredictable failure [1]. Different invasive and non invasive approaches for motor incipient fault detection/diagnosis have been reported [11-15]. Many of the motor incipient fault detection/diagnosis schemes can

Paris-Sud XI, Université de

122

Axial-Gap Induction Motor For Levitated Specimens  

NASA Technical Reports Server (NTRS)

Motor does not obscure view of specimen. Axial-gap induction motor applies torque to rotate electrostatically or electromagnetically levitated specimen of metal. Possible applications include turning specimens for uniform heating under focused laser beams and obtaining indirect measurements of resistivities or of surface tensions in molten specimens.

Sridharan, Govind; Rhim, Won-Kyu; Barber, Dan; Chung, Sang

1992-01-01

123

Soft Computing Application in Fault Detection of Induction Motor  

SciTech Connect

The paper investigates the effectiveness of different patter classifier like Feed Forward Back Propagation (FFBPN), Radial Basis Function (RBF) and Support Vector Machine (SVM) for detection of bearing faults in Induction Motor. The steady state motor current with Park's Transformation has been used for discrimination of inner race and outer race bearing defects. The RBF neural network shows very encouraging results for multi-class classification problems and is hoped to set up a base for incipient fault detection of induction motor. SVM is also found to be a very good fault classifier which is highly competitive with RBF.

Konar, P.; Puhan, P. S.; Chattopadhyay, P. Dr. [Electrical Engineering Department, BESUS, Shibpur (India)

2010-10-26

124

A completely isolated three-phase to three-phase induction motor\\/induction generation power conversion system  

Microsoft Academic Search

Two squirrel cage induction machines interconnected via a parallel resonant high-frequency AC link and associated switching pulse density modulated (PDM) converters are investigated, one operating as a generator and the other as a motor. The real power of the generator is controlled so as to maintain the proper link voltage and match the power between the input and output. Current

Irfan Alan; T.A. Lipo

1992-01-01

125

Advanced motor and motor control development  

NASA Astrophysics Data System (ADS)

The capability of operating a high speed permanent magnet brushless dc motor with electronic controller over a wide load and speed range was demonstrated. A centrifugal pump was used as the loading mechanism and hydraulic fluid was pumped in simulation of an aircraft engine fuel pump requirement. A motor speed of 45,000 rpm was reached and a maximum output of 68.5 hp was demonstrated. The response of the system to step commands for speed change was established. Reduction of size and weight of electronic control was established as a primary future goal. The program system concept with minor rotating machine improvements is viable for high speed drive applications up to 100-hp level.

Wuertz, Kenneth L.; Beauchamp, Edward D.

1988-08-01

126

Identification of Thermally Safe Load Cycles for An Induction Motor Position Servo  

Microsoft Academic Search

Advances in the available performance of induction motor-inverter systems permit these drive systems to meet progressively more demanding performance criteria. High-performance servos require the induction motor to produce high torque and power. The severely repetitive load cycles stress the motor's insulation with high operating temperatures. The traditional rating of the induction motor based on ac line operation is not useful

R. Krishnan; Frank C. Doran; Thomas S. Latos

1987-01-01

127

Stator Current and Motor Efficiency as Indicators for Different Types of Bearing Faults in Induction Motors  

Microsoft Academic Search

This paper proposes a new approach to use stator current and efficiency of induction motors as indicators of rolling-bearing faults. After a presentation of the state of the art about condition monitoring of vibration and motor current for the diagnostics of bearings, this paper illustrates the experimental results on four different types of bearing defects: crack in the outer race,

Lucia Frosini; Ezio Bassi

2010-01-01

128

High speed linear induction motor efficiency optimization  

E-print Network

One of the reasons linear motors, a technology nearly a century old, have not been adopted for a large number of linear motion applications is that they have historically had poor efficiencies. This has restricted the ...

Johnson, Andrew P. (Andrew Peter)

2005-01-01

129

The inverter drive loss of induction motor made by soft magnetic composite  

Microsoft Academic Search

This paper presents the loss analysis of the induction motor made of soft magnetic composite which is driven by inverter. SMC is used for the stator core of the induction motor. The loss of SMC motor increased by the inverter harmonics is lower than that of conventional electromagnetic steel motor. SMC motor has advantage in the high frequency drive.

Yutaka Sasaki; Masayuki Morimoto

2009-01-01

130

Multisensor fusion for induction motor aging analysis and fault diagnosis  

NASA Astrophysics Data System (ADS)

Induction motors are the most commonly used electrical drives, ranging in power from fractional horsepower to several thousand horsepowers. Several studies have been conducted to identify the cause of failure of induction motors in industrial applications. Recent activities indicate a focus towards building intelligence into the motors, so that a continuous on-line fault diagnosis and prognosis may be performed. The purpose of this research and development was to perform aging studies of three-phase, squirrel-cage induction motors; establish a database of mechanical, electrical and thermal measurements from load testing of the motors; develop a sensor-fusion method for on-line motor diagnosis; and use the accelerated aging models to extrapolate to the normal aging regimes. A new laboratory was established at The University of Tennessee to meet the goals of the project. The accelerated aging and motor performance tests constitute a unique database, containing information about the trend characteristics of measured signatures as a function of motor faults. The various measurements facilitate enhanced fault diagnosis of motors and may be effectively utilized to increase the reliability of decision making and for the development of life prediction techniques. One of these signatures is the use of Multi-Resolution Analysis (MRA) using wavelets. Using MRA in trending different frequency bands has revealed that higher frequencies show a characteristic increase when the condition of a bearing is in question. This study effectively showed that the use of MRA in vibration signatures can identify a thermal degradation or degradation via electrical charge of the bearing, whereas other failure mechanisms, such as winding insulation failure, do not exhibit such characteristics. A motor diagnostic system, called the Intelligent Motor Monitoring System (IMMS) was developed in this research. The IMMS integrated the various mechanical, electrical and thermal signatures, and artificial neural networks and fuzzy logic algorithms. The IMMS was then used for motor fault detection and isolation and for estimating its remaining operable lifetime. The performance of the IMMS was evaluated using the motor aging data, and showed that several motor degradation modes could be effectively diagnosed and the prognosis of motor operation could be established.

Erbay, Ali Seyfettin

131

Torque control for electric motors  

NASA Technical Reports Server (NTRS)

Method for adjusting electric-motor torque output to accomodate various loads utilizes phase-lock loop to control relay connected to starting circuit. As load is imposed, motor slows down, and phase lock is lost. Phase-lock signal triggers relay to power starting coil and generate additional torque. Once phase lock is recoverd, relay restores starting circuit to its normal operating mode.

Bernard, C. A.

1980-01-01

132

HTS axial flux induction motor with analytic and FEA modeling  

NASA Astrophysics Data System (ADS)

This paper presents a high-temperature superconductor (HTS) axial-flux induction motor, which can output levitation force and torque simultaneously. In order to analyze the character of the force, analytic method and finite element method are adopted to model the motor. To make sure the HTS can carry sufficiently large current and work well, the magnetic field distribution in HTS coil is calculated. An effective method to improve the critical current of HTS coil is presented. Then, AC losses in HTS windings in the motor are estimated and tested.

Li, S.; Fan, Y.; Fang, J.; Qin, W.; Lv, G.; Li, J. H.

2013-11-01

133

Evaluation of half wave induction motor drive for use in passenger vehicles  

NASA Technical Reports Server (NTRS)

Research performed at the University of Missouri-Columbia to devise and design a lower cost inverter induction motor drive for electrical propulsion of passenger vehicles is described. A two phase inverter motor system is recommended. The new design is predicted to provide comparable vehicle performance, improved reliability and a cost advantage for a high production vehicle, decreased total rating of the power semiconductor switches, and a somewhat simpler control hardware compared to the conventional three phase bridge inverter motor drive system. The major disadvantages of the two phase inverter motor drive are that it is larger and more expensive than a three phase machine, the design of snubbers for the power leakage inductances produce higher transient voltages, and the torque pulsations are relatively large because of the necessity to limit the inverter switching frequency to achieve high efficiency.

Hoft, R. G.; Kawamura, A.; Goodarzi, A.; Yang, G. Q.; Erickson, C. L.

1985-01-01

134

Time Domain Response of Induction Motors with PWM Supplies  

Microsoft Academic Search

Induction motors may be excited by rectangular voltage waves which are pulsewidth modulated according to a wide variety of strategies. The determination of performance directly in the time domain has hitherto been regarded as a complex task requiring considerable mathematical knowledge, and solution in the frequency domain has been preferred. The way is described in which the time domain response

N. R. Namburi; Thomas H. Barton

1985-01-01

135

Induction Motor Operation With Non-Sinusoidal Impressed Voltages  

Microsoft Academic Search

The usual procedure in considering the operation of induction motors has been to neglect the effect of harmonics. Although in most instances this gives results which are sufficiently accurate, the question of how much these effects are or how much is being neglected has yet to be answered in electrical engineering literature. In this paper an attempt is made to

L. A. Doggett; E. R. Queer

1929-01-01

136

Parameter identification of induction motors. 2. Parameter subset identification  

Microsoft Academic Search

The model-based identification concept is applied to the problem of subset parameter identification and identification of repeated parameters in induction motors. The aim of the investigation is a simplification of the identifier dynamics with a reduction of the computational burden. The feasibility of real-time applications of the methodology is also investigated

V. Pappano; S. E. Lyshevski; B. Friedland

1998-01-01

137

A novel induction motor starting method using superconduction  

NASA Astrophysics Data System (ADS)

In this paper, an alternative method for starting up induction motors is proposed, taking into account experimental measurements. The new starting current limitation method is based on using a high-temperature superconductor. A prototype of the superconducting starting current limiter was constructed with a commercially available second-generation high-temperature superconductor YBCO tape, and this was tested with a 55-kW industrial induction motor in a 440-V/60-Hz three-phase power grid. Performance evaluations of the superconducting limiter method (applied to startup of the induction motor) were performed and were compared with a direct-on-line starter and an electronic soft starter. In addition, a computational model was developed and used for electromagnetic torque analysis of the system. As significant characteristics, our method offers the ability to limit the starting current of the induction motor with greater electromagnetic torque, reduced current waveform distortion and therefore lower harmonic pollution during startup when compared to the soft starter method.

Silva, F. B. B.; Orlando, M. T. D.; Fardin, J. F.; Simonetti, D. S.; Baldan, C. A.

2014-12-01

138

Demonstration of Lenz's Law with an Induction Motor  

ERIC Educational Resources Information Center

The interaction of a conductor with a time-dependent magnetic field is an important topic of electromagnetic theory. A computerized classroom demonstration shows how the eddy currents induced in the rotor of an induction motor cause its rotation or braking. Both phenomena are directly related to Lenz's law.

Kraftmakher, Yaakov

2005-01-01

139

An Alternative Adaptation Mechanism for Model Reference Adaptive System Based Sensorless Induction Motor Drive  

Microsoft Academic Search

The model reference adaptive system is one of the methods for speed estimation of a sensorless induction motor drive. The model reference adaptive system comprises of tee blocksthe reference model, the adjustable model, and the adaptation mechanism. A proportional-integral controller is commonly used in the adaptation mechanism. In this article, an alternative structure of the adaptation mechanism is proposed. The

Suman Maiti; Chandan Chakraborty

2010-01-01

140

Universal adaptive torque control for PM motors for field-weakening region operation  

DOEpatents

The invention includes a motor controller and method for controlling a permanent magnet motor. In accordance with one aspect of the present technique, a permanent magnet motor is controlled by, among other things, receiving a torque command, determining a normalized torque command by normalizing the torque command to a characteristic current of the motor, determining a normalized maximum available voltage, determining an inductance ratio of the motor, and determining a direct-axis current based upon the normalized torque command, the normalized maximum available voltage, and the inductance ratio of the motor.

Royak, Semyon (Beachwood, OH); Harbaugh, Mark M. (Richfield, OH); Breitzmann, Robert J. (South Russel, OH); Nondahl, Thomas A. (Wauwatosa, WI); Schmidt, Peter B. (Franklin, WI); Liu, Jingbo (Milwaukee, WI)

2011-03-29

141

Electric Vehicle Induction Motor DSVM-DTC with Torque Ripple Minimization  

E-print Network

Electric Vehicle Induction Motor DSVM-DTC with Torque Ripple Minimization Farid Khoucha1 a sensorless DSVM-DTC of an induction motor that propels an electrical vehicle or a hybrid one. The drive uses, as demonstrated in experimental results. Keywords: Electric vehicle (EV), induction motor, Discrete Space Vector

Paris-Sud XI, Université de

142

What Stator Current Processing Based Technique to Use for Induction Motor Rotor Faults Diagnosis?  

E-print Network

What Stator Current Processing Based Technique to Use for Induction Motor Rotor Faults Diagnosis fault detection. Index Terms--Induction motor, rotor fault diagnosis, stator current. I. INTRODUCTION in induction motors. Features of these techniques which are relevant to fault detection are presented

Paris-Sud XI, Université de

143

Induction Motors Bearing Failures Detection and Diagnosis: Park and Concordia Transform  

E-print Network

Induction Motors Bearing Failures Detection and Diagnosis: Park and Concordia Transform Approaches with the problem of bearing failure detection and diagnosis in induction motors. Indeed, bearings deterioration and compared. Experimental tests, on a 0.75-kW two-pole induction motor with artificial bearing damages

Boyer, Edmond

144

A model of double star induction motors under rotor bar defect for diagnosis purpose  

Microsoft Academic Search

This paper investigates the modelling of a double star induction motor when this one operates under rotor fault. A special attention is paid only to the rotor defect. The use of double star induction motors or six-phase induction motors is increasing and we can find it in high power process. Its main advantage lies in most reliability in case of

H. Razik; G. Didier; T. Lubin; C. R. da Silva; A. W. Mascarenhas; C. B. Jacobina; A. M. N. Lima; E. R. C. da Silva

2005-01-01

145

Precision stop control for motors  

NASA Technical Reports Server (NTRS)

An improved stop control system and method are provided for a motor having a drive mechanism in which the motor is coupled to a motor controller that controls the speed and position of the drive mechanism using a first signal indicative of a commanded position of the drive mechanism, a second signal indicative of the actual speed of the drive mechanism and a third signal indicative of the actual position of the drive mechanism. The improved system/method uses a first circuit that receives the first and third signal and generates an error signal indicative of a difference therebetween. A second circuit receives the error signal and compares same with a threshold position error. The result of this comparison is used to selectively supply the second signal (i.e., speed) to the motor controller at least whenever the error signal is less than the threshold position error so that the motor controller can use the second signal in conjunction with the third signal to stop the motor.

Howard, David E. (Inventor); Montenegro, Justino (Inventor)

2000-01-01

146

Thermal modelling for an induction motor  

NASA Astrophysics Data System (ADS)

The authors of this paper intend to achieve the study of the thermal behaviour in permanent rate of an asynchronous motor with a wounded rotor of a rated power of 4kW. 66 thermocouples have been settled in the stator at different places like the centers and the bottoms of the windings or the middle of the yoke. A design has been realized thanks to the magnetostatic modulus of the computation software with the finite elements method Flux2d converted in a resolution tool of the heat equation. Another originality of this study is to introduce areas including a contact thermal resistance phenomenon in some places of the motor to characterize the motor thermophysical parameters and to obtain the experimentation-calculation convergence. Les auteurs de cet article se proposent de raliser l'tude du comportement thermique en rgime permanent d'un moteur asynchrone de 4kW rotor bobin. 66 thermocouples ont t positionns en diffrents lieux du stator tels que les milieux des bobinages, les fonds d'encoches ou encore le milieu des tles. Un modle a t ralis l'aide du logiciel de calculs magntostatiques par lments finis Flux2d converti en un outil de rsolution de l'quation de la chaleur. Une autre originalit de cette tude a t d'introduire en certains endroits du moteur des zones o la notion de rsistance thermique de contact est particulirement importante. L'introduction de paramtres thermophysiques les caractrisant s'est avre ncessaire pour obtenir la convergence exprimentation-simulation.

Glises, R.; Miraoui, A.; Kauffmann, J. M.

1993-09-01

147

A Fast Induction Motor Speed Estimation based on Hybrid Particle Swarm Optimization (HPSO)  

NASA Astrophysics Data System (ADS)

Intelligent control and estimation of power electronic systems by fuzzy logic and neural network techniques with fast torque and flux show tremendous promise in future. This paper proposed the application of Hybrid Particle Swarm Optimization (HPSO) for losses and operating cost minimization control in the induction motor drives. The main advantages of the proposed technique are; its simple structure and its straightforward maximization of induction motor efficiency and its operating cost for a given load torque. As will be demonstrated, Hybrid Particle Swarm Optimization (HPSO) is so efficient in finding the optimum operating machine's flux level. The results demonstrate the good quality and robustness in the system dynamic response and reduction in the steady-state and transient motor ripple torque.

Aryza, Solly; Abdallah, Ahmed N.; Khalidin, Zulkeflee bin; Lubis, Zulkarnain; Jie, Ma

148

Proposal of a test bench for switched reluctance motors and fractional-horsepower single-phase induction motors  

Microsoft Academic Search

This study addresses a proposal of a bench to test single-phase induction motors and switched reluctance motors with rated power up to 1 hp. The bench was set up so that single-phase induction motor tests meet requirements of IEEE Std. 1142001 and the Brazilian related Standard (ABNT NBR 5383-2\\/2008). In addition, the test procedures for reluctance motors comprise sequential steps

W. C. E. Teixeira; G. P. Viajante; E. G. Marra; B. Alvarenga; M. C. Costa; I. E. Chabu; J. R. Cardoso

2009-01-01

149

Proposal of a test bench for switched reluctance motors and fractional-horsepower single-phase induction motors  

Microsoft Academic Search

This study addresses a proposal of a bench to test single-phase induction motors and switched reluctance motors with rated power up to 1 hp. The bench was set up so that single-phase induction motor tests meet requirements of IEEE Std. 114-2001 and the Brazilian related Standard (ABNT NBR 5383-2\\/2008). In addition, the test procedures for reluctance motors comprise sequential steps

W. C. E. Teixeira; G. P. Viajante; E. G. Marra; B. Alvarenga; M. C. Costa; I. E. Chabu; J. R. Cardoso

2009-01-01

150

Speed Sensorless Induction Motor Drives for Electrical Actuators: Schemes, Trends and Tradeoffs  

NASA Technical Reports Server (NTRS)

For a decade, induction motor drive-based electrical actuators have been under investigation as potential replacement for the conventional hydraulic and pneumatic actuators in aircraft. Advantages of electric actuator include lower weight and size, reduced maintenance and operating costs, improved safety due to the elimination of hazardous fluids and high pressure hydraulic and pneumatic actuators, and increased efficiency. Recently, the emphasis of research on induction motor drives has been on sensorless vector control which eliminates flux and speed sensors mounted on the motor. Also, the development of effective speed and flux estimators has allowed good rotor flux-oriented (RFO) performance at all speeds except those close to zero. Sensorless control has improved the motor performance, compared to the Volts/Hertz (or constant flux) controls. This report evaluates documented schemes for speed sensorless drives, and discusses the trends and tradeoffs involved in selecting a particular scheme. These schemes combine the attributes of the direct and indirect field-oriented control (FOC) or use model adaptive reference systems (MRAS) with a speed-dependent current model for flux estimation which tracks the voltage model-based flux estimator. Many factors are important in comparing the effectiveness of a speed sensorless scheme. Among them are the wide speed range capability, motor parameter insensitivity and noise reduction. Although a number of schemes have been proposed for solving the speed estimation, zero-speed FOC with robustness against parameter variations still remains an area of research for speed sensorless control.

Elbuluk, Malik E.; Kankam, M. David

1997-01-01

151

Three phase AC motor controller  

DOEpatents

A motor controller for a three phase AC motor (10) which is adapted to operate bidirectionally from signals received either from a computer (30) or a manual control (32). The controller is comprised of digital logic circuit means which implement a forward and reverse command signal channel (27, 29) for the application of power through the forward and reverse power switching relays (16, 18, 20, 22). The digital logic elements are cross coupled to prevent activation of both channels simultaneously and each includes a plugging circuit (65, 67) for stopping the motor upon the removal of control signal applied to one of the two channels (27, 29) for a direction of rotation desired. Each plugging circuit (65, 67) includes a one-shot pulse signal generator (88, 102) which outputs a single pulse signal of predetermined pulsewidth which is adapted to inhibit further operation of the application of power in the channel which is being activated and to apply a reversal command signal to the other channel which provides a reversed phase application of power to the motor for a period defined by the pulse-width output of the one-shot signal generator to plug the motor (10) which will then be inoperative until another rotational command signal is applied to either of the two channels.

Vuckovich, Michael (Elizabeth, PA); Wright, Maynard K. (Bethel Park, PA); Burkett, John P. (South Huntington Township, Westmoreland County, PA)

1984-03-20

152

Voltage oscillatory instability caused by induction motor loads  

SciTech Connect

Isolated power systems which fit the structure of a single equivalent generator supplying an equivalent composite load can experience a voltage oscillatory instability entirely traceable to effects of induction motor loads interacting with automatic voltage regulators. This scenario is one where an AVR properly tuned for open circuit conditions is not necessarily well tuned for the on load condition. The phenomenon is explained and a simple solution through AVR compensation is suggested.

Mello, F.P. de [de Mello (F.P.), Burnt Hills, NY (United States)] [de Mello (F.P.), Burnt Hills, NY (United States); Feltes, J.W. [Power Technologies, Inc., Schenectady, NY (United States)] [Power Technologies, Inc., Schenectady, NY (United States)

1996-08-01

153

46 CFR 111.70-3 - Motor controllers and motor-control centers.  

...Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) ELECTRICAL ENGINEERING ELECTRIC SYSTEMS-GENERAL REQUIREMENTS Motor Circuits, Controllers, and Protection 111.70-3 Motor controllers and motor-control...

2014-10-01

154

46 CFR 111.70-3 - Motor controllers and motor-control centers.  

Code of Federal Regulations, 2010 CFR

...Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) ELECTRICAL ENGINEERING ELECTRIC SYSTEMS-GENERAL REQUIREMENTS Motor Circuits, Controllers, and Protection 111.70-3 Motor controllers and motor-control...

2010-10-01

155

46 CFR 111.70-3 - Motor controllers and motor-control centers.  

Code of Federal Regulations, 2013 CFR

...Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) ELECTRICAL ENGINEERING ELECTRIC SYSTEMS-GENERAL REQUIREMENTS Motor Circuits, Controllers, and Protection 111.70-3 Motor controllers and motor-control...

2013-10-01

156

46 CFR 111.70-3 - Motor controllers and motor-control centers.  

Code of Federal Regulations, 2011 CFR

...Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) ELECTRICAL ENGINEERING ELECTRIC SYSTEMS-GENERAL REQUIREMENTS Motor Circuits, Controllers, and Protection 111.70-3 Motor controllers and motor-control...

2011-10-01

157

46 CFR 111.70-3 - Motor controllers and motor-control centers.  

Code of Federal Regulations, 2012 CFR

...Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) ELECTRICAL ENGINEERING ELECTRIC SYSTEMS-GENERAL REQUIREMENTS Motor Circuits, Controllers, and Protection 111.70-3 Motor controllers and motor-control...

2012-10-01

158

Induction motor servo drive with adaptive rotor time-constant estimation  

Microsoft Academic Search

An indirect filed-oriented induction motor (IM) position servo drive with adaptive rotor time-constant estimation and an on-line trained neural network controller is presented. First, the rotor time-constant is estimated real-time on the basis of the model reference adaptive system (MRAS) theory. Next, a linear model-following controller (LMFC) is designed according to the estimated plant model to allow the state responses

Faa-Jeng Lin; Ho-Ming Su; Hong-Pong Chen

1998-01-01

159

Improving Control of Two Motor Controllers  

NASA Technical Reports Server (NTRS)

A computer program controls motors that drive translation stages in a metrology system that consists of a pair of two-axis cathetometers. This program is specific to Compumotor Gemini (or equivalent) motors and the Compumotor 6K-series (or equivalent) motor controller. Relative to the software supplied with the controller, this program affords more capabilities and is easier to use. Written as a Virtual Instrument in the LabVIEW software system, the program presents an imitation control panel that the user can manipulate by use of a keyboard and mouse. There are three modes of operation: command, movement, and joystick. In command mode, single commands are sent to the controller for troubleshooting. In movement mode, distance, speed, and/or acceleration commands are sent to the controller. Position readouts from the motors and from position encoders on the translation stages are displayed in marked fields. At any time, the position readouts can be recorded in a file named by the user. In joystick mode, the program yields control of the motors to a joystick. The program sends commands to, and receives data from, the controller via a serial cable connection, using the serial-communication portion of the software supplied with the controller.

Toland, Ronald W.

2004-01-01

160

Sensorless Control of Induction MachinesWith or Without Signal Injection?  

Microsoft Academic Search

Controlled induction motor drives without mechanical speed sensors at the motor shaft have the attractions of low cost and high reliability. To replace the sensor, information on the rotor speed is extracted from measured stator currents and from voltages at motor terminals. Vector-controlled drives require estimating the magnitude and spatial orientation of the fundamental magnetic flux waves in the stator

Joachim Holtz

2006-01-01

161

Electric Machine with Boosted Inductance to Stabilize Current Control  

NASA Technical Reports Server (NTRS)

High-powered motors typically have very low resistance and inductance (R and L) in their windings. This makes the pulse-width modulated (PWM) control of the current very difficult, especially when the bus voltage (V) is high. These R and L values are dictated by the motor size, torque (Kt), and back-emf (Kb) constants. These constants are in turn set by the voltage and the actuation torque-speed requirements. This problem is often addressed by placing inductive chokes within the controller. This approach is undesirable in that space is taken and heat is added to the controller. By keeping the same motor frame, reducing the wire size, and placing a correspondingly larger number of turns in each slot, the resistance, inductance, torque constant, and back-emf constant are all increased. The increased inductance aids the current control but ruins the Kt and Kb selections. If, however, a fraction of the turns is moved from their "correct slot" to an "incorrect slot," the increased R and L values are retained, but the Kt and Kb values are restored to the desired values. This approach assumes that increased resistance is acceptable to a degree. In effect, the heat allocated to the added inductance has been moved from the controller to the motor body, which in some cases is preferred.

Abel, Steve

2013-01-01

162

Motor Control: Neural Models and System Theory  

E-print Network

Motor Control: Neural Models and System Theory Kenji Doya Information Sciences Division, ATR theory communities. The biological motor system is in some sense an ideal realization of control of motor control. We focus on three topics: 1) The cerebellum and adaptive control; 2) Reinforcement

Doya, Kenji

163

The Application of High-Resolution Spectral Analysis for Identifying Multiple Combined Faults in Induction Motors  

Microsoft Academic Search

Induction motors are critical components for most industries. Induction motor failures may yield an unexpected interruption at the industry plant. Several conventional vibration and current analysis techniques exist by which certain faults in rotating machinery can be identified; however, they generally deal with a single fault only. Instead, in real induction machines, the case of multiple faults is common. When

Arturo Garcia-Perez; Rene de Jesus Romero-Troncoso; Eduardo Cabal-Yepez; Roque Alfredo Osornio-Rios

2011-01-01

164

Cerebellum and Ocular Motor Control  

PubMed Central

An intact cerebellum is a prerequisite for optimal ocular motor performance. The cerebellum fine-tunes each of the subtypes of eye movements so they work together to bring and maintain images of objects of interest on the fovea. Here we review the major aspects of the contribution of the cerebellum to ocular motor control. The approach will be based on structuralfunctional correlation, combining the effects of lesions and the results from physiologic studies, with the emphasis on the cerebellar regions known to be most closely related to ocular motor function: (1) the flocculus/paraflocculus for high-frequency (brief) vestibular responses, sustained pursuit eye movements, and gaze holding, (2) the nodulus/ventral uvula for low-frequency (sustained) vestibular responses, and (3) the dorsal oculomotor vermis and its target in the posterior portion of the fastigial nucleus (the fastigial oculomotor region) for saccades and pursuit initiation. PMID:21909334

Kheradmand, Amir; Zee, David S.

2011-01-01

165

Thermal analysis of an integral-horsepower multichip power module (MCPM) based induction motor drive  

Microsoft Academic Search

This paper presents the thermal analysis of a highly-integrated intelligent, integral-horsepower, three-phase induction motor drive based on multichip module (MCM) technology. This solid-state controller, known as a multichip power module (MCPM), uses known good die to obtain minimal footprint, volume, mass and cost, while maximizing efficiency, reliability, and manufacturability. Using a commercially-available finite-element analysis program, various substrate technologies are evaluated

David M. Hall; VijaylaXmi Gumaste; K. J. Olejniczak; K. C. Burgers; A. P. Malshe

1997-01-01

166

Ultra-Compact Motor Controller  

NASA Technical Reports Server (NTRS)

This invention is an electronically commutated brushless motor controller that incorporates Hall-array sensing in a small, 42-gram package that provides 4096 absolute counts per motor revolution position sensing. The unit is the size of a miniature hockey puck, and is a 44-pin male connector that provides many I/O channels, including CANbus, RS-232 communications, general-purpose analog and digital I/O (GPIO), analog and digital Hall inputs, DC power input (18-90 VDC, 0-l0 A), three-phase motor outputs, and a strain gauge amplifier. This controller replaces air cooling with conduction cooling via a high-thermal-conductivity epoxy casting. A secondary advantage of the relatively good heat conductivity that comes with ultra-small size is that temperature differences within the controller become smaller, so that it is easier to measure the hottest temperature in the controller with fewer temperature sensors, or even one temperature sensor. Another size-sensitive design feature is in the approach to electrical noise immunity. At a very small size, where conduction paths are much shorter than in conventional designs, the ground becomes essentially isopotential, and so certain (space-consuming) electrical noise control components become unnecessary, which helps make small size possible. One winding-current sensor, applied to all of the windings in fast sequence, is smaller and wastes less power than the two or more sensors conventionally used to sense and control winding currents. An unexpected benefit of using only one current sensor is that it actually improves the precision of current control by using the "same" sensors to read each of the three phases. Folding the encoder directly into the controller electronics eliminates a great deal of redundant electronics, packaging, connectors, and hook-up wiring. The reduction of wires and connectors subtracts substantial bulk and eliminates their role in behaving as EMI (electro-magnetic interference) antennas. A shared knowledge by each motor controller of the state of all the motors in the system at 500 Hz also allows parallel processing of higher-level kinematic matrix calculations.

Townsend, William T.; Crowell, Adam; Hauptman, Traveler; Pratt, Gill Andrews

2012-01-01

167

Failure analysis of 7500 HP induction motors driving reciprocating compressors with three years service  

Microsoft Academic Search

This paper presents the failure analysis and field measurements of five 7500 HP induction motors driving reciprocating compressors for a natural gas compression station. The motors were in service for less than three years when two of them suffered cooling fan failures. Four of the five motors were individually sent one at a time to a motor repair shop to

R. Hanna; D. W. Schmitt

2010-01-01

168

NASTRAN buckling study of a linear induction motor reaction rail  

NASA Technical Reports Server (NTRS)

NASTRAN was used to study problems associated with the installation of a linear induction motor reaction rail test track. Specific problems studied include determination of the critical axial compressive buckling stress and establishment of the lateral stiffness of the reaction rail under combined loads. NASTRAN results were compared with experimentally obtained values and satisfactory agreement was obtained. The reaction rail was found to buckle at an axial compressive stress of 11,400 pounds per square inch. The results of this investigation were used to select procedures for installation of the reaction rail.

Williams, J. G.

1973-01-01

169

Motorized control for mirror mount apparatus  

DOEpatents

A motorized control and automatic braking system for adjusting mirror mount apparatus is disclosed. The motor control includes a planetary gear arrangement to provide improved pitch adjustment capability while permitting a small packaged design. The motor control for mirror mount adjustment is suitable for laser beam propagation applications. The brake is a system of constant contact, floating detents which engage the planetary gear at selected between-teeth increments to stop rotation instantaneously when the drive motor stops.

Cutburth, Ronald W. (Tracy, CA)

1989-01-01

170

Diagnostics of DC and Induction Motors Based on the Analysis of Acoustic Signals  

NASA Astrophysics Data System (ADS)

In this paper, a non-invasive method of early fault diagnostics of electric motors was proposed. This method uses acoustic signals generated by electric motors. Essential features were extracted from acoustic signals of motors. A plan of study of acoustic signals of electric motors was proposed. Researches were carried out for faultless induction motor, induction motor with one faulty rotor bar, induction motor with two faulty rotor bars and flawless Direct Current, and Direct Current motor with shorted rotor coils. Researches were carried out for methods of signal processing: log area ratio coefficients, Multiple signal classification, Nearest Neighbor classifier and the Bayes classifier. A pattern creation process was carried out using 40 samples of sound. In the identification process 130 five-second test samples were used. The proposed approach will also reduce the costs of maintenance and the number of faulty motors in the industry.

Glowacz, A.

2014-10-01

171

Self-bearing motor design & control  

E-print Network

This thesis presents the design, implementation and control of a new class of self-bearing motors. The primary thesis contributions include the design and experimental demonstration of hysteresis self-bearing motors, novel ...

Imani Nejad, Mohammad

2013-01-01

172

Abstract--We are considering the problem of controlling inductions motors driven through AC/DC rectifiers and DC/AC  

E-print Network

inverter through a transformer and an AC/DC rectifier The connection line between the rectifier range regulation for the system including the AC/DC converter, the DC/AC inverter and the induction. The pollution caused by the converter may be reduced resorting to additional protection equipments (transformers

Boyer, Edmond

173

Servo Motor Position and Velocity Control Model  

NSDL National Science Digital Library

The Servo Motor Position and Velocity Control Model simulates the use of a proportional-integral-derivative (PID) controller to run a DC motor. The motor is modeled as a first order system and the simulation allows the user to control either the position of the motor or its velocity. This EJS simulation is based on a real system running at the Spanish Open University for Distance Education (UNED).  The real DC motor is used as a remote laboratory for learning purposes and a different application created with EJS (visually identical to this simulation) serves as graphical user interface to operate the remote laboratory.

De La Torre, Luis; Oyarzun, Hector V.

2014-03-18

174

Modeling and Analysis of the Wanlass Three-Phase Induction Motor Configuration  

Microsoft Academic Search

The so-called Wanlass configuration for three-phase induction motors is discussed and analyzed. This configuration is modeled using conventional induction motor analysis techniques. Test results are presented which verify the modeling techniques. The authors conclude that the Wanlass configuration does not result in improved performance over that which is achievable using conventional winding techniques.

Stephen D. Umans; Herbert L. Hess

1983-01-01

175

Models for Bearing Damage Detection in Induction Motors Using Stator Current Monitoring  

E-print Network

Models for Bearing Damage Detection in Induction Motors Using Stator Current Monitoring Martin Bl of rolling-element bearing faults on induction motor stator cur- rent. Bearing problems are one major cause for drive failures. Their detection is possible by vibration monitoring of charac- teristic bearing

Paris-Sud XI, Université de

176

Induction Motors Bearing Failures Detection and Diagnosis Using a RBF ANN Park Pattern Based Method  

E-print Network

Induction Motors Bearing Failures Detection and Diagnosis Using a RBF ANN Park Pattern Based Method of bearing failure detection and diagnosis in induction motors. The proposed approach is a sensor to automate the fault detection and diagnosis process. Experimental tests with artificial bearing damages

Paris-Sud XI, Université de

177

Detection of Induction Motor Faults: A Comparison of Stator Current, Vibration and Acoustic Methods  

Microsoft Academic Search

In this paper we present the comparison results of induction motor fault detection using stator current, vibration, and acoustic methods. A broken rotor bar fault and a combination of bearing faults (inner race, outer race, and rolling element faults) were induced into variable speed three-phase induction motors. Both healthy and faulty signatures were acquired under different speed and load conditions.

WEIDONG LI; CHRIS K. MECHEFSKE

2006-01-01

178

Wind energy conversion system simulator using variable speed induction motor  

Microsoft Academic Search

The conventional synchronous generator in wind energy conversion system are now getting replaced by variable speed induction generator to extract maximum power with wide range of wind speed limit. The design and performance of such system are required a simplified digital simulator, especially for development of optimal control solutions. The proposed work is to make a prototype of an variable

S. W. Mohod; M. V. Aware

2010-01-01

179

Control apparatus of electric motor cars  

Microsoft Academic Search

The invention discloses an electric motor car wherein an electric motor for driving the car is energized by a fuel engine driven generator and a battery is connected in parallel with the motor to be float charged by the generator. Control apparatus is provided for always maintaining the output of the generator at a constant value irrespective of variations in

Gocho

1978-01-01

180

Variable speed drive with current source inverter supply and permanent magnet synchronous motor compared with cage induction motor  

Microsoft Academic Search

Contents Industrial drives with adjustable speed and a progressive torque speed characteristic may be built with a considerably higher efficiency by using the permanent magnet excited synchronous motor instead of the squirrel cage induction motor. To prove the benefit, the power losses of two experimental drive systems were determined by calculation and measurement as well. The air gap damper losses

E. Ch. Andresen; R. Keller

1997-01-01

181

Analytical analysis of single- and three-phase induction motors  

SciTech Connect

The analysis of single and multiphase induction motors continues to represent a challenge to researchers in computational electromagnetics due to the presence of r{Omega} x B electric fields. This contribution cannot be inserted into the Green`s function for boundary element codes; finite difference and finite element approaches are forced to hard code these effects, compensating at high speeds with upwinding techniques. The direct computation of these affects using transfer relations in a linear environment offers an analytical backdrop both for benchmark testing numerical codes and for design assessment criteria. In addition to torque-speed predictions, the terminal relations and total power dissipation in the rotor are computed for an exposed winding three-phase and single-phase machine.

Davey, K.R. [American Maglev, New Smyrna Beach, FL (United States)] [American Maglev, New Smyrna Beach, FL (United States)

1998-09-01

182

Aggregation of Induction Motors in a Power System Based on Some Special Operating Conditions  

Microsoft Academic Search

This paper presents a simple method for aggregating three-phase double-cage rotor induction motors connected to a common bus based on their equivalent circuits in power system studies. It is simple to aggregate the motors based on their equivalent circuits under certain operating conditions. The proposed method has been directly derived from the equivalent circuits of motors at a same bus

K. W. Louie; J. R. Marti; H. W. Dommel

2007-01-01

183

Model-Based Fault Diagnosis of Induction Motors Using Non-Stationary Signal Segmentation  

NASA Astrophysics Data System (ADS)

Effective detection and diagnosis of incipient faults is desirable for on-line condition assessment, product quality assurance and improved operational efficiency of induction motors running off the power supply mains. In this paper, an empirical model-based fault diagnosis system is developed for induction motors using recurrent dynamic neural networks and multiresolution signal processing methods. In addition to nameplate information required for the initial set-up, the proposed diagnosis system uses measured motor terminal currents and voltages, and motor speed. The effectiveness of the diagnosis system is demonstrated through staged motor faults of electrical and mechanical origin. The developed system is scalable to different power ratings and it has been successfully demonstrated with data from 2.2, 373 and 597 kW induction motors. Incremental tuning is used to adapt the diagnosis system during commissioning on an new motor, significantly reducing the system development time.

Kim, K.; Parlos, A. G.

2002-03-01

184

Induction motors with minimum waste of magnetic iron  

NASA Astrophysics Data System (ADS)

An induction motor with minimum waste of magnetic iron has been developed. The stator core is made of silicon-iron steel strip, its width equal to the core height, and wound on edge to form a stack. Stator slots closed on the bore side and open on the outside for winding are formed together with teeth separating them by corrugating a silicon-iron steel strip of width equal to the stack length and sliding it, after winding, inside the core with an insulation interlayer between them. The thickness of this interlayer does not exceed 20% of the air gap between stator and rotor, but even this degrades motor starting and running performance. The performance is also degraded by leakage of magnetic flux through the slot bridge on the bore side and by nonuniformity of the air gap width resulting from corrugation of the stator bore surface. These drawbacks are partly compensated by lining the slots with film insulation instead of sleeves or tubes, thus making more slot space available for copper. Prototypes were built with 0.5 mm thick strip of 2212 steel for the teeth and strip of 08KP steel for the core, separated by a 0.03 mm layer of EKD-14 epoxy compound, with the air gap correspondingly narrowed from 0.25 to 0.2 mm. The stator winding is a singlelayer one of enamelled and triple vinyl-covered 0.67/0.73 mm copper wire, the slots insulated with Dacron film.

Boyko, Y. P.; Makarov, F. K.; Kremeshnyy, Y. A.; Stepanyants, E. A.

1984-11-01

185

Control and Training of Individual Motor Units  

Microsoft Academic Search

Experiments clearly demonstrate that with the help of auditory and visual cues man can single out motor units and control their isolated contractions. Experiments on the training of this control, interpreted as the training of descending pathways to single anterior horn cells, provide a new glimpse of the fineness of conscious motor controls. After training, subjects can recall into activity

J. V. Basmajian

1963-01-01

186

Reducing current reversal time in electric motor control  

DOEpatents

The time required to reverse current flow in an electric motor is reduced by exploiting inductive current that persists in the motor when power is temporarily removed. Energy associated with this inductive current is used to initiate reverse current flow in the motor.

Bredemann, Michael V

2014-11-04

187

Controller for computer control of brushless dc motors. [automobile engines  

NASA Technical Reports Server (NTRS)

A motor speed and torque controller for brushless d.c. motors provides an unusually smooth torque control arrangement. The controller provides a means for controlling a current waveform in each winding of a brushless dc motor by synchronization of an excitation pulse train from a programmable oscillator. Sensing of torque for synchronization is provided by a light beam chopper mounted on the motor rotor shaft. Speed and duty cycle are independently controlled by controlling the frequency and pulse width output of the programmable oscillator. A means is also provided so that current transitions from one motor winding to another is effected without abrupt changes in output torque.

Hieda, L. S. (inventor)

1981-01-01

188

Advanced dc-Traction-Motor Control System  

NASA Technical Reports Server (NTRS)

Motor-control concept for battery-powered vehicles includes stateof-the-art power-transistor switching and separate excitation of motor windings in traction and regenerative braking. Switching transistors and other components of power-conditioning subsystem operate under control of computer that coordinates traction, braking, and protective functions.

Vittone, O.

1985-01-01

189

Investigation of motor characteristics when connected to a Nola controller  

NASA Astrophysics Data System (ADS)

Tests performed on Nola-type power factor controllers for induction motors are described. The behavior and efficiency of representative controllers for motors of single phase fractional horsepower and three phase up to 25 horsepower were examined. In so far as possible, normal installation and operating conditions were simulated. The controllers were initially adjusted according to manufacturer's instructions and tests were run under various conditions of load and input voltage to determine their operating characteristics. Most of the controllers tested were purchased at random from representative manufacturers. However, during the period of the investigation, several manufacturers loaned controllers to the project to be tested. Some of the controllers operated reasonally well while others could not be stabilized at all. Operating data were included for those units which were stable and mention was made of those which were not.

Fuller, J. F.; Hanna, W. J.

1982-12-01

190

Method and apparatus for controlling multiple motors  

DOEpatents

A method and apparatus are provided for simultaneously controlling a plurality of stepper motors. Addressing circuitry generates address data for each motor in a periodic address sequence. Memory circuits respond to the address data for each motor by accessing a corresponding memory location containing a first operational data set functionally related to a direction for moving the motor, speed data, and rate of speed change. First logic circuits respond to the first data set to generate a motor step command. Second logic circuits respond to the command from the first logic circuits to generate a third data set for replacing the first data set in memory with a current operational motor status, which becomes the first data set when the motor is next addressed.

Jones, Rollin G. (Los Alamos, NM); Kortegaard, Bert L. (Los Alamos, NM); Jones, David F. (Los Alamos, NM)

1987-01-01

191

Aerospace induction motor actuators driven from a 20-kHz power link  

NASA Technical Reports Server (NTRS)

Aerospace electromechanical actuators utilizing induction motors are under development in sizes up to 40 kW. While these actuators have immediate application to the Advanced Launch System (ALS) program, several potential applications are currently under study including the Advanced Aircraft Program. Several recent advances developed for the Space Station Freedom have allowed induction motors to be selected as a first choice for such applications. Among these technologies are bi-directional electronics and high frequency power distribution techniques. Each of these technologies are discussed with emphasis on their impact upon induction motor operation.

Hansen, Irving G.

1990-01-01

192

Fuzzy control of small servo motors  

NASA Technical Reports Server (NTRS)

To explore the benefits of fuzzy logic and understand the differences between the classical control methods and fuzzy control methods, the Togai InfraLogic applications engineering staff developed and implemented a motor control system for small servo motors. The motor assembly for testing the fuzzy and conventional controllers consist of servo motor RA13M and an encoder with a range of 4096 counts. An interface card was designed and fabricated to interface the motor assembly and encoder to an IBM PC. The fuzzy logic based motor controller was developed using the TILShell and Fuzzy C Development System on an IBM PC. A Proportional-Derivative (PD) type conventional controller was also developed and implemented in the IBM PC to compare the performance with the fuzzy controller. Test cases were defined to include step inputs of 90 and 180 degrees rotation, sine and square wave profiles in 5 to 20 hertz frequency range, as well as ramp inputs. In this paper we describe our approach to develop a fuzzy as well as PH controller, provide details of hardware set-up and test cases, and discuss the performance results. In comparison, the fuzzy logic based controller handles the non-linearities of the motor assembly very well and provides excellent control over a broad range of parameters. Fuzzy technology, as indicated by our results, possesses inherent adaptive features.

Maor, Ron; Jani, Yashvant

1993-01-01

193

Application of Dempster Shafer theory in fault diagnosis of induction motors using vibration and current signals  

NASA Astrophysics Data System (ADS)

This paper presents an approach for the fault diagnosis in induction motors by using Dempster-Shafer theory. Features are extracted from motor stator current and vibration signals and with reducing data transfers. The technique makes it possible for on-line application. Neural network is trained and tested by the selected features of the measured data. The fusion of classification results from vibration and current classifiers increases the diagnostic accuracy. The efficiency of the proposed system is demonstrated by detecting motor electrical and mechanical faults originated from the induction motors. The results of the test confirm that the proposed system has potential for real-time applications.

Yang, Bo-Suk; Kim, Kwang Jin

2006-02-01

194

22. DIABLO POWERHOUSE: COOLING WATER PUMPS (WESTINGHOUSE C.S. INDUCTION MOTORS), ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

22. DIABLO POWERHOUSE: COOLING WATER PUMPS (WESTINGHOUSE C.S. INDUCTION MOTORS), 1989. - Skagit Power Development, Diablo Powerhouse, On Skagit River, 6.1 miles upstream from Newhalem, Newhalem, Whatcom County, WA

195

Oscillation control system for electric motor drive  

DOEpatents

A feedback system for controlling mechanical oscillations in the torsionally complaint drive train of an electric or other vehicle. Motor speed is converted in a processor to estimate state signals in which a plant model which are used to electronically modify thetorque commands applied to the motor.

Slicker, James M. (Union Lake, MI); Sereshteh, Ahmad (Union Lake, MI)

1988-01-01

196

Oscillation control system for electric motor drive  

DOEpatents

A feedback system for controlling mechanical oscillations in the torsionally complaint drive train of an electric or other vehicle. Motor speed is converted in a processor to estimate state signals in which a plant model which are used to electronically modify the torque commands applied to the motor. 5 figs.

Slicker, J.M.; Sereshteh, A.

1988-08-30

197

Computerized Torque Control for Large dc Motors  

NASA Technical Reports Server (NTRS)

Speed and torque ranges in generator mode extended. System of shunt resistors, electronic switches, and pulse-width modulation controls torque exerted by large, three-phase, electronically commutated dc motor. Particularly useful for motor operating in generator mode because it extends operating range to low torque and high speed.

Willett, Richard M.; Carroll, Michael J.; Geiger, Ronald V.

1987-01-01

198

DSP based space vector PWM drive for constant power operation of two-phase induction motors  

Microsoft Academic Search

A novel space vector pulse-width modulated (SVPWM) inverter is proposed for constant power operation of two-phase induction motors. The operating principle of SVPWM is described. The algorithm for constant power operation is presented. Some critical issues in the design of a two-phase inverter-driven induction type appliance motor are discussed. Results of experimentation are also provided at the end of the

M. A. Jabbar; A. M. Khambadkone; Zhang Yanfeng

2001-01-01

199

Ultra-Compact Motor Controller  

NASA Technical Reports Server (NTRS)

This invention is an electronically commutated brushless motor contro ller that incorporates Hall-array sensing in a small, 42-gram packag e that provides 4096 absolute counts per motor revolution position s ensing. The unit is the size of a miniature hockey puck, and is a 44 -pin male connector that provides many I/O channels, including CANbus , RS-232 communications, general-purpose analog and digital I/O (GPI O), analog and digital Hall inputs, DC power input (18-90 VDC, 0-l0 A), three-phase motor outputs, and a strain gauge amplifier.

Townsend, William T.; Cromwell, Adam; Hauptman, Traveler; Pratt, Gill Andrews

2012-01-01

200

Induction of motor associative plasticity in the posterior parietal cortex-primary motor network.  

PubMed

There is anatomical and functional connectivity between the primary motor cortex (M1) and posterior parietal cortex (PPC) that plays a role in sensorimotor integration. In this study, we applied corticocortical paired-associative stimuli to ipsilateral PPC and M1 (parietal ccPAS) in healthy right-handed subjects to test if this procedure could modulate M1 excitability and PPC-M1 connectivity. One hundred and eighty paired transcranial magnetic stimuli to the PPC and M1 at an interstimulus interval (ISI) of 8 ms were delivered at 0.2 Hz. We found that parietal ccPAS in the left hemisphere increased the excitability of conditioned left M1 assessed by motor evoked potentials (MEPs) and the input-output curve. Motor behavior assessed by the Purdue pegboard task was unchanged compared with controls. At baseline, conditioning stimuli over the left PPC potentiated MEPs from left M1 when ISI was 8 ms. This interaction significantly attenuated at 60 min after left parietal ccPAS. Additional experiments showed that parietal ccPAS induced plasticity was timing-dependent, was absent if ISI was 100 ms, and could also be seen in the right hemisphere. Our results suggest that parietal ccPAS can modulate M1 excitability and PPC-M1 connectivity and is a new approach to modify motor excitability and sensorimotor interaction. PMID:23968834

Chao, Chi-Chao; Karabanov, Anke Ninija; Paine, Rainer; Carolina de Campos, Ana; Kukke, Sahana N; Wu, Tianxia; Wang, Han; Hallett, Mark

2015-02-01

201

Use of fuzzy inference system for condition monitoring of induction motor  

NASA Astrophysics Data System (ADS)

Three phase induction motors are commonly used in industry due to its robustness, simplicity of its construction and high reliability. The tasks performed by these motors grow increasingly complex because of modern industries hence there is a need to determine the faults. Early detection of faults will reduce an unscheduled machine downtime that can upset production deadlines and may cause heavy financial losses. This paper is focused in developing a computer based system using Fuzzy Inference system's membership function. An unusual increase in vibration of the motor could be an indicator of faulty condition hence the vibration of the motor of an induction motor was used as an input, whereas the output is the motor condition. An inference system of the Fuzzy Logic was created to classify the vibration characteristics of the motor which is called vibration analysis. The system classified the motor of the gas distribution pump condition as from 'acceptable' to 'monitor closely'. The early detection of unusual increase in vibration of the induction motor is an important part of a predictive maintenance for motor driven machinery.

Janier, Josefina B.; Zaim Zaharia, M. F.; Karim, Samsul Ariffin Abd.

2012-09-01

202

TRANSIENT ANALYSIS OF BRAKING MODE OPERATION OF INDUCTION MOTOR FED FROM A VARIABLE FREQUENCY SOURCE  

Microsoft Academic Search

The transient behaviour of a three phase induction motor in the braking mode is investigated when the motor is fed from a variable frequency source. Appropriate voltage and frequency conditions to ensure minimum stopping time for plugging as well as for the case when plugging is used in conjunction with regenerative braking are identified. A dynamic model has been developed

J. R. P. GUPTA; BHIM SINGH; S. S. MURTHY

1983-01-01

203

29. INDUCTION MOTOR (6600 VOLTS, 5750 H.P.) DRIVES THE 21INCH ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

29. INDUCTION MOTOR (6600 VOLTS, 5750 H.P.) DRIVES THE 21-INCH AND 18-INCH BILLET MILLS. MOTOR WAS MANUFACTURED BY THE GENERAL ELECTRIC COMPANY, SCHENECTADY, NEW YORK. - Corrigan, McKinney Steel Company, 3100 East Forty-fifth Street, Cleveland, Cuyahoga County, OH

204

Sound based induction motor fault diagnosis using Kohonen self-organizing map  

NASA Astrophysics Data System (ADS)

The induction motors, which have simple structures and design, are the essential elements of the industry. Their long-lasting utilization in critical processes possibly causes unavoidable mechanical and electrical defects that can deteriorate the production. The early diagnosis of the defects in induction motors is crucial in order to avoid interruption of manufacturing. In this work, the mechanical and the electrical faults which can be observed frequently on the induction motors are classified by means of analysis of the acoustic data of squirrel cage induction motors recorded by using several microphones simultaneously since the true nature of propagation of sound around the running motor provides specific clues about the types of the faults. In order to reveal the traces of the faults, multiple microphones are placed in a hemispherical shape around the motor. Correlation and wavelet-based analyses are applied for extracting necessary features from the recorded data. The features obtained from same types of motors with different kind of faults are used for the classification using the Self-Organizing Maps method. As it is described in this paper, highly motivating results are obtained both on the separation of healthy motor and faulty one and on the classification of fault types.

Germen, Emin; Ba?aran, Murat; Fidan, Mehmet

2014-05-01

205

Phenomena appearing in oil film of bearings in induction motors supplied from PWM inverters  

Microsoft Academic Search

The paper discusses the electrical properties of ball bearings in induction motors. The investigations showed that the electrical properties of bearings depend on the lubricant temperature, speed, load and value of bearings voltage. Experiments have been performed on specially modified motors (insulated bearings), so that rotors were electrically separated from stators. The tests of electrical properties of bearings were carried

Zdzislaw Krzemien

2001-01-01

206

Position Sensorless Vector Control for Permanent Magnet Synchronous Motors Based on Maximum Torque Control Frame  

Microsoft Academic Search

High efficiency drive can be achieved by the maximum torque-per-ampere (MTPA) control which used reluctance torque effectively. However, the calculations for estimating rotor position and for controlling the d-axis current are required. The motor parameters of inductance etc. that are easily affected by magnetic saturation are included in those calculations. This paper proposes a new MTPA control method, which is

Hajime Hida; Yoshio Tomigashi; Keiji Kishimoto

2007-01-01

207

Lyapunov-based microstepping control of Sawyer motors with PID control  

Microsoft Academic Search

Proportional-integral-derivative (PID) controls have been widely used for Sawyer motors. The electrical dynamics are generally neglected in general PIDs control since the electrical dynamics are faster than the mechanical dynamics. However, when the current control is used, the phase currents are reduced by back-emf and have the phase lags due to inductances. Thus, the electrical dynamics should be considered to

Wonhee Kim; Donghoon Shin; Dong Gyu Gang; Chung Choo Chung

2010-01-01

208

Aggregation of induction motors based on their equivalent circuits under some special operating conditions  

Microsoft Academic Search

The paper presents a simple method for aggregating the three-phase single-cage-rotor induction motors connected to a common bus based on their equivalent circuits in power system studies. It is simple to aggregate the motors based on their equivalent circuits in certain operating states. The proposed method has been directly derived from the equivalent circuits of the motors at a same

K. W. Louie; Cree Crescent

2005-01-01

209

Performance of induction motor with free-rotating magnets inside its rotor  

Microsoft Academic Search

This paper presents a new induction motor that has free-rotating magnets inside a rotor. The magnets can revolve freely against the rotor with the shaft. In this motor, the airgap flux is provided by both rotating permanent magnets and the stator coil current. A prototype motor was fabricated by modifying the rotor of a conventional three-phase four-pole 400 W squirrel-cage

Yoshiyuki Shibata; Nuio Tsuchida; Koji Imai

1999-01-01

210

FPGA-Based Online Detection of Multiple Combined Faults in Induction Motors Through Information Entropy and Fuzzy Inference  

Microsoft Academic Search

The development of monitoring systems for rotating machines is the ability to accurately detect different faults in an incipient state. The most popular rotating machine in industry is the squirrel-cage induction motor, and the failure on such motors may have severe consequences in costs, product quality, and safety. Most of the condition-monitoring techniques for induction motors focus on a single

Rene J. Romero-Troncoso; Ricardo Saucedo-Gallaga; Eduardo Cabal-Yepez; Arturo Garcia-Perez; Roque A. Osornio-Rios; Ricardo Alvarez-Salas; Homero Miranda-Vidales; Nicolas Huber

2011-01-01

211

FUZZY LOGIC CONTROL OF ELECTRIC MOTORS AND MOTOR DRIVES: FEASIBILITY STUDY  

EPA Science Inventory

The report gives results of a study (part 1) of fuzzy logic motor control (FLMC). The study included: 1) reviews of existing applications of fuzzy logic, of motor operation, and of motor control; 2) a description of motor control schemes that can utilize FLMC; 3) selection of a m...

212

Two Archetypes of Motor Control Research  

PubMed Central

This reply to the Commentaries is focused on two archetypes of motor control research, one based on physics and physiology and the other based on control theory and ideas of neural computations. The former approach, represented by the equilibrium-point hypothesis, strives to discover the physical laws and salient physiological variables that make purposeful coordinated movements possible. The latter approach, represented by the ideas of internal models and optimal control, tries to apply methods of control developed for man-made inanimate systems to the human body. Specific issues related to control with subthreshold membrane depolarization, motor redundancy, and the idea of synergies are briefly discussed. PMID:21479107

Latash, Mark L.

2010-01-01

213

Efficiency testing of medium induction motors: A comment on IEEE Std 112-1991  

SciTech Connect

The energy crisis of 1973 focused attention on the efficiency of polyphase induction motors, and the need to have a test procedure that was repeatable and accurate. Medium induction motors, especially those in the size range 1 through 125 horsepower, were important because of the large number in service and the fact that a significant efficiency improvement through redesign was economically feasible. In response to this the ANSI/IEEE Std. 112, ``IEEE Standard Test Procedure for Polyphase Induction Motors and Generators`` Method B was chosen for testing medium ac motors for efficiency. The current version IEEE std. 112-1991 Method B contains several requirements for accuracy improvement which have been found to be effective. Even though the Method B procedure with the additional accuracy requirement has been in use since 1984 no rational has been published to support these extra requirements. The paper discusses the purpose of these improvements, and also point out some weakness in procedure.

Gray, G.G. [GE Motors and Industrial Systems, Owensboro, KY (United States)] [GE Motors and Industrial Systems, Owensboro, KY (United States); Martiny, W.J.

1996-09-01

214

Field-Oriented Control of a Standard AC Motor Using Microprocessors  

Microsoft Academic Search

Field orientation has emerged as a powerful tool for controlling ac machines such as inverter-supplied induction motors. The dynamic performance of such a drive is comparable to that of a converterfed four quadrant dc drive. The complex functions required by filed-oriented control may be executed by microprocessors on line, thus greatly reducing the necessary control hardware. It is shown that

Rupprecht Gabriel; Werner Leonhard; Craig J. Nordby

1980-01-01

215

The neural optimal control hierarchy for motor control  

NASA Astrophysics Data System (ADS)

Our empirical, neuroscientific understanding of biological motor systems has been rapidly growing in recent years. However, this understanding has not been systematically mapped to a quantitative characterization of motor control based in control theory. Here, we attempt to bridge this gap by describing the neural optimal control hierarchy (NOCH), which can serve as a foundation for biologically plausible models of neural motor control. The NOCH has been constructed by taking recent control theoretic models of motor control, analyzing the required processes, generating neurally plausible equivalent calculations and mapping them on to the neural structures that have been empirically identified to form the anatomical basis of motor control. We demonstrate the utility of the NOCH by constructing a simple model based on the identified principles and testing it in two ways. First, we perturb specific anatomical elements of the model and compare the resulting motor behavior with clinical data in which the corresponding area of the brain has been damaged. We show that damaging the assigned functions of the basal ganglia and cerebellum can cause the movement deficiencies seen in patients with Huntington's disease and cerebellar lesions. Second, we demonstrate that single spiking neuron data from our model's motor cortical areas explain major features of single-cell responses recorded from the same primate areas. We suggest that together these results show how NOCH-based models can be used to unify a broad range of data relevant to biological motor control in a quantitative, control theoretic framework.

DeWolf, T.; Eliasmith, C.

2011-10-01

216

Method and apparatus for large motor control  

DOEpatents

Apparatus and method for providing digital signal processing method for controlling the speed and phase of a motor involves inputting a reference signal having a frequency and relative phase indicative of a time based signal; modifying the reference signal to introduce a slew-rate limited portion of each cycle of the reference signal; inputting a feedback signal having a frequency and relative phase indicative of the operation of said motor; modifying the feedback signal to introduce a slew-rate limited portion of each cycle of the feedback signal; analyzing the modified reference signal and the modified feedback signal to determine the frequency of the modified reference signal and of the modified feedback signal and said relative phase between said modified reference signal and said modified feedback signal; and outputting control signals to the motor for adjusting said speed and phase of the motor based on the frequency determination and determination of the relative phase.

Rose, Chris R. (Santa Fe, NM); Nelson, Ronald O. (White Rock, NM)

2003-08-12

217

Motor feedback speed control by utilizing the motor feeder cable as a communication channel  

Microsoft Academic Search

A feedback loop is used in the motor speed control in order to transmit the measured motor rotational speed information to the controller. The implementation of the feedback loop requires cabling between the motor and the frequency converter both for signalling and powering. However, the motor power cables could be also used for data transmission. The possibility of using the

A. Kosonen; M. Jokinen; V. Sarkimaki; J. Ahola; M. Niemela

2006-01-01

218

Motor Control Abnormalities in Parkinson's Disease  

E-print Network

Motor Control Abnormalities in Parkinson's Disease Pietro Mazzoni, Britne Shabbott, and Juan Camilo York 10032 Correspondence: pm125@columbia.edu The primary manifestations of Parkinson's disease control processes. In the case of Parkinson's disease, movement slowness, for example, would be explained

219

Improved transistorized AC motor controller for battery powered urban electric passenger vehicles  

NASA Astrophysics Data System (ADS)

An ac motor controller for an induction motor electric vehicle drive system was designed, fabricated, tested, evaluated, and cost analyzed. A vehicle performance analysis was done to establish the vehicle tractive effort-speed requirements. These requirements were then converted into a set of ac motor and ac controller requirements. The power inverter is a three-phase bridge using power Darlington transistors. The induction motor was optimized for use with an inverter power source. The drive system has a constant torque output to base motor speed and a constant horsepower output to maximum speed. A gear shifting transmission is not required. The ac controller was scaled from the base 20 hp (41 hp peak) at 108 volts dec to an expanded horsepower and battery voltage range. Motor reversal was accomplished by electronic reversal of the inverter phase sequence. The ac controller can also be used as a boost chopper battery charger. The drive system was tested on a dynamometer and results are presented. The current-controlled pulse width modulation control scheme yielded improved motor current waveforms. The ac controller favors a higher system voltage.

Peak, S. C.

1982-09-01

220

Novel high-speed induction motor for a commercial centrifugal compressor  

Microsoft Academic Search

This paper describes the electrical, mechanical and metallurgical design, construction, and testing of a novel low-cost high-speed high-efficiency induction motor to drive a new type of small centrifugal compressor in industrial cooling applications. The 28-shaft-hp 50-kr\\/min motor features a unique laminated rotor with a multifunction high-strength copper-alloy cage brazed with a novel process. Relatively thin high-silicon steel laminations were used

Wen L. Soong; Gerald B. Kliman; Roger N. Johnson; Raymond A. White; Joseph E. Miller

2000-01-01

221

What stator current processing-based technique to use for induction motor rotor faults diagnosis?  

Microsoft Academic Search

In recent years, marked improvement has been achieved in the design and manufacture of stator winding. However, motors driven by solid-state inverters undergo severe voltage stresses due to rapid switch-on and switch-off of semiconductor switches. Also, induction motors are required to operate in highly corrosive and dusty environments. Requirements such as these have spurred the development of vastly improved insulation

Mohamed El Hachemi Benbouzid; Gerald B. Kliman

2003-01-01

222

Detection of broken rotor bars in induction motors using nonlinear Kalman filters.  

PubMed

This paper presents a model-based fault detection approach for induction motors. A new filtering technique using Unscented Kalman Filter (UKF) and Extended Kalman Filter (EKF) is utilized as a state estimation tool for on-line detection of broken bars in induction motors based on rotor parameter value estimation from stator current and voltage processing. The hypothesis on which the detection is based is that the failure events are detected by jumps in the estimated parameter values of the model. Both UKF and EKF are used to estimate the value of rotor resistance. Upon breaking a bar the estimated rotor resistance is increased instantly, thus providing two values of resistance after and before bar breakage. In order to compare the estimation performance of the EKF and UKF, both observers are designed for the same motor model and run with the same covariance matrices under the same conditions. Computer simulations are carried out for a squirrel cage induction motor. The results show the superiority of UKF over EKF in nonlinear system (such as induction motors) as it provides better estimates for rotor fault detection. PMID:20206346

Karami, Farzaneh; Poshtan, Javad; Poshtan, Majid

2010-04-01

223

Molecular motors: design, mechanism and control  

E-print Network

Biological functions in each animal cell depend on coordinated operations of a wide variety of molecular motors. Some of the these motors transport cargo to their respective destinations whereas some others are mobile workshops which synthesize macromolecules while moving on their tracks. Some other motors are designed to function as packers and movers. All these motors require input energy for performing their mechanical works and operate under conditions far from thermodynamic equilibrium. The typical size of these motors and the forces they generate are of the order of nano-meters and pico-Newtons, respectively. They are subjected to random bombardments by the molecules of the surrounding aqueous medium and, therefore, follow noisy trajectories. Because of their small inertia, their movements in the viscous intracellular space exhibits features that are characteristics of hydrodynamics at low Reynold's number. In this article we discuss how theoretical modeling and computer simulations of these machines by physicists are providing insight into their mechanisms which engineers can exploit to design and control artificial nano-motors.

Debashish Chowdhury

2007-09-12

224

Abstract--The single-phase capacitor-run induction motor is widespread for small power applications where the  

E-print Network

Abstract--The single-phase capacitor-run induction motor is widespread for small power applications speed measurement on the basis of the capacitor voltage and proposes a low cost command device for a rolling shutter induction motor. First of all the article shows the analytical expression of the capacitor

Boyer, Edmond

225

Brushless Motor Controller Report Spring 2010  

E-print Network

Brushless Motor Controller Report Spring 2010 May 15, 2010 Brian Clementi MAE of 2010 322 Bogert semesters Spring 2010 Biorobotics and Locomotion Lab Cornell University #12;2 Table of Contents I. Pneumatic systems require large, heavy storage tanks for compressed air, necessitating large air compressors

Ruina, Andy L.

226

Design and prototyping methods for brushless motors and motor control  

E-print Network

In this report, simple, low-cost design and prototyping methods for custom brushless permanent magnet synchronous motors are explored. Three case-study motors are used to develop, illustrate and validate the methods. Two ...

Colton, Shane W. (Shane William)

2010-01-01

227

A universal computer control system for motors  

NASA Technical Reports Server (NTRS)

A control system for a multi-motor system such as a space telerobot, having a remote computational node and a local computational node interconnected with one another by a high speed data link is described. A Universal Computer Control System (UCCS) for the telerobot is located at each node. Each node is provided with a multibus computer system which is characterized by a plurality of processors with all processors being connected to a common bus, and including at least one command processor. The command processor communicates over the bus with a plurality of joint controller cards. A plurality of direct current torque motors, of the type used in telerobot joints and telerobot hand-held controllers, are connected to the controller cards and responds to digital control signals from the command processor. Essential motor operating parameters are sensed by analog sensing circuits and the sensed analog signals are converted to digital signals for storage at the controller cards where such signals can be read during an address read/write cycle of the command processing processor.

Szakaly, Zoltan F. (inventor)

1991-01-01

228

Motor Control Theories and Their Applications  

PubMed Central

Summary We describe several influential hypotheses in the field of motor control including the equilibrium-point (referent configuration) hypothesis, the uncontrolled manifold hypothesis, and the idea of synergies based on the principle of motor abundance. The equilibrium-point hypothesis is based on the idea of control with thresholds for activation of neuronal pools; it provides a framework for analysis of both voluntary and involuntary movements. In particular, control of a single muscle can be adequately described with changes in the threshold of motor unit recruitment during slow muscle stretch (threshold of the tonic stretch reflex). Unlike the ideas of internal models, the equilibrium-point hypothesis does not assume neural computations of mechanical variables. The uncontrolled manifold hypothesis is based on the dynamic system approach to movements; it offers a toolbox to analyze synergic changes within redundant sets of elements related to stabilization of potentially important performance variables. The referent configuration hypothesis and the principle of abundance can be naturally combined into a single coherent scheme of control of multi-element systems. A body of experimental data on healthy persons and patients with movement disorders are reviewed in support of the mentioned hypotheses. In particular, movement disorders associated with spasticity are considered as consequences of an impaired ability to shift threshold of the tonic stretch reflex within the whole normal range. Technical details and applications of the mentioned hypotheses to studies of motor learning are described. We view the mentioned hypotheses as the most promising ones in the field of motor control, based on a solid physical and neurophysiological foundation. PMID:20944446

Latash, Mark L.; Levin, Mindy F.; Scholz, John P.; Schner, Gregor

2010-01-01

229

DC Motor control using motor-generator set with controlled generator field  

DOEpatents

A d.c. generator is connected in series opposed to the polarity of a d.c. power source supplying a d.c. drive motor. The generator is part of a motor-generator set, the motor of which is supplied from the power source connected to the motor. A generator field control means varies the field produced by at least one of the generator windings in order to change the effective voltage output. When the generator voltage is exactly equal to the d.c. voltage supply, no voltage is applied across the drive motor. As the field of the generator is reduced, the drive motor is supplied greater voltage until the full voltage of the d.c. power source is supplied when the generator has zero field applied. Additional voltage may be applied across the drive motor by reversing and increasing the reversed field on the generator. The drive motor may be reversed in direction from standstill by increasing the generator field so that a reverse voltage is applied across the d.c. motor.

Belsterling, Charles A. (Norristown, PA); Stone, John (Medford, NJ)

1982-01-01

230

Motor control in a Drosophila taste circuit  

PubMed Central

Tastes elicit innate behaviors critical for directing animals to ingest nutritious substances and reject toxic compounds, but the neural basis of these behaviors is not understood. Here, we use a neural silencing screen to identify neurons required for a simple Drosophila taste behavior, and characterize a neural population that controls a specific subprogram of this behavior. By silencing and activating subsets of the defined cell population, we identify the neurons involved in the taste behavior as a pair of motor neurons located in the subesophageal ganglion (SOG). The motor neurons are activated by sugar stimulation of gustatory neurons and inhibited by bitter compounds; however, experiments utilizing split-GFP detect no direct connections between the motor neurons and primary sensory neurons, indicating that further study will be necessary to elucidate the circuitry bridging these populations. Combined, these results provide a general strategy and a valuable starting point for future taste circuit analysis. PMID:19217375

Gordon, Michael D.; Scott, Kristin

2009-01-01

231

Adjustable AC capacitor for a single-phase induction motor  

Microsoft Academic Search

The most common practice for starting a single-phase induction machine (SPIM) is to install a starting capacitor in series with the auxiliary winding. In some applications, two capacitors are used. One is used during the starting period to help create the starting torque. The other one is used during the running condition to improve efficiency. The possibility of using an

E. Muljadi; Y. Zhao; T.-H. Liu; T.A. Lipo

1993-01-01

232

Stability of distribution networks with embedded generators and induction motors  

Microsoft Academic Search

The paper investigates the collective and individual influence of synchronous and induction embedded generators (EG) on stability of a generic distribution network. With a model of the network developed in IPSA computer software package simulations were performed to determine the behavioural characteristics of the system (voltage and angular stability) with a varied mix of embedded generators, system loads and operating

J. V. Milanovic; T. A. David

2002-01-01

233

Detuning Detection in Induction Motors Hugo Rodriguez-Cortes, Christoforos N. Hadjicostis and Aleksandar M. Stankovic  

E-print Network

Detuning Detection in Induction Motors Hugo Rodr´iguez-Cort´es, Christoforos N. Hadjicostis and Aleksandar M. Stankovi´c Abstract-- In this article we present a model-based scheme to detect detuned. In the case of a detuned operation, however, the performance can degrade substantially, both in tran- sients

Stankoviæ, Aleksandar

234

Singular value decomposition based feature extraction approaches for classifying faults of induction motors  

NASA Astrophysics Data System (ADS)

This paper proposes singular value decomposition (SVD)-based feature extraction methods for fault classification of an induction motor: a short-time energy (STE) plus SVD technique in the time-domain analysis, and a discrete cosine transform (DCT) plus SVD technique in the frequency-domain analysis. To early identify induction motor faults, the extracted features are utilized as the inputs of multi-layer support vector machines (MLSVMs). Since SVMs perform well with the radial basis function (RBF) kernel for appropriately categorizing the faults of the induction motor, it is important to explore the impact of the ? values for the RBF kernel, which affects the classification accuracy. Likewise, this paper quantitatively evaluates the classification accuracy with different numbers of features, because the number of features affects the classification accuracy. According to the experimental results, although SVD-based features are effective for a noiseless environment, the STE plus SVD feature extraction approach is more effective with and without sensor noise in terms of the classification accuracy than the DCT plus SVD feature extraction approach. To demonstrate the improved classification of the proposed approach for identifying faults of the induction motor, the proposed SVD based feature extraction approach is compared with other state-of-the art methods and yields higher classification accuracies for both noiseless and noisy environments than conventional approaches.

Kang, Myeongsu; Kim, Jong-Myon

2013-12-01

235

Dynamic Performances of Tubular Linear Induction Motor for Pneumatic Capsule Pipeline System  

Microsoft Academic Search

? Abstract Tubular linear induction motor (TLIM) can be used as a capsule pump in a large pneumatic capsule pipeline (PCP) system. Parametric performance evaluation of the designed 1-meter diameter PCP-TLIM system yields encouraging results for practical implementation. The capsule thrust and speed inside the TLIM pump can be calculated from the combination of the PCP fluid mechanics and the

W. Plodpradista

2009-01-01

236

An improved series equivalent circuit of a single-sided linear induction motor  

Microsoft Academic Search

The derivation of the equivalent circuit for a single-sided linear induction motor (SLIM) is not straightforward. Especially if it includes longitudinal end effects from the cut-open primary magnetic path, transverse edge effects from the differing widths between the primary lamination and secondary sheet, and half filled primary slots. This paper proposes an improved series equivalent circuit for this machine. The

Wei Xu; Jianguo Zhu; Yongchang Zhang; D. G. Dorrell; Yaohua Li; Yongjian Li

2009-01-01

237

LMI-based Gain Scheduled Robust Flux Observer for Induction Motors  

Microsoft Academic Search

In this paper a robust flux observer for an induction motor is developed through an LMI approach. The observer is robust to changes in rotational speed and in rotor and stator resis- tances. The problem is formulated as complex-valued rank constrained LMIs and solved through alternating projections. The method achieves good performance with very little tun- ing needed.

Klaus Trangbk

238

Detection of Broken Bars in Induction Motors Using an Extended Kalman Filter  

E-print Network

Detection of Broken Bars in Induction Motors Using an Extended Kalman Filter for Rotor Resistance and currents are processed by an Extended Kalman Filter for the speed and rotor resistance simultaneous bars. In the proposed extended Kalman Filter approach, the state covariance matrix is adequacy weighted

Paris-Sud XI, Université de

239

Optimal Design of Rotor Slot Geometry of Squirrel-Cage Type Induction Motors  

Microsoft Academic Search

This paper deals with the optimal design of squirrel- cage rotor slots and copper bars of high power induction motors with respect to the values of starting torque, breakdown torque, rated values of efficiency and power factor as well as rotor heating. Three geometries of rotor slots and of bars cross-section, keeping the same cross-section area, are considered: rectangular shape,

V. Fireteanu; T. Tudorache; O. A. Turcanu

2007-01-01

240

Combination of independent component analysis and support vector machines for intelligent faults diagnosis of induction motors  

Microsoft Academic Search

This paper studies the application of independent component analysis (ICA) and support vector machines (SVMs) to detect and diagnose of induction motor faults. The ICA is used for feature extraction and data reduction from original features. The principal components analysis is also applied in feature extraction process for comparison with ICA does. In this paper, the training of the SVMs

Achmad Widodo; Bo-suk Yang; Tian Han

2007-01-01

241

Intelligent fault diagnosis system of induction motor based on transient current signal  

Microsoft Academic Search

This paper presents a method for induction motor fault diagnosis based on transient signal using component analysis and support vector machine (SVM). The start-up transient current signal is selected as features source for fault diagnosis. Preprocessing of transient current signal is performed using smoothing and discrete wavelet transform to highlight the salient features of faults. In this work, independent component

Achmad Widodo; Bo-Suk Yang; Dong-Sik Gu; Byeong-Keun Choi

2009-01-01

242

Novel Method of Mitigation of Conducted EMI in PWM Inverter Fed Induction Motor Adjustable Speed Drives  

Microsoft Academic Search

Mitigation of electro magnetic interference (EMI) in PWM inverter fed a.c. induction motor adjustable speed drives is becoming an important issue. In this paper the power converters are viewed totally in a different way from that of the normal viewpoint of energy conversion. It has been found that the converter itself is a common mode voltage generator. As the switching

A. Ramachandran; M. C. Reddy

2006-01-01

243

Parameter identification of induction motors. 1. The model-based concept  

Microsoft Academic Search

The model-based identification concept is applied to the problem of parameter identification in induction motors. The convergence of the identification algorithm is investigated using extended and partial data acquisition. The developed approach to parameter identification requires full state measurement. A parameter subset identification methodology and online implementation issues are also introduced using the identification method developed by Lyshevski (1997). These

V. Pappano; S. E. Lyshevski; Friedland

1998-01-01

244

Predicting the localized flux distribution in three phase induction motor between different stator slot size  

Microsoft Academic Search

A three phase induction motor differences of stator slot size is investigated in terms of its localized flux distribution. The search coil induced voltage method is used to analyze the flux distribution in the stator core. For both stator models, the maximum flux density is found near the tooth tip and minimum towards the outer region of the stator core.

S. Nor Shafiqin; N. H. Halim; I. Daut; Y. Yanawati; M. Asri; M. Dina; N. Gomesh; I. Pungut; M. Abdullah; M. N. Syatirah

2011-01-01

245

A Voltage Space Vector Diagram Formed by Six Concentric Dodecagons for Induction Motor Drives  

Microsoft Academic Search

A new voltage space vector diagram consisting of six concentric dodecagons is proposed in this paper. The space vector diagram is developed for an open-end induction motor drive fed from two three-level neutral point clamped (NPC) inverters with asymmetric isolated dc voltage sources. As already reported in literature, a dodecagonal space vector diagram is advantageous over a hexagonal one, since

Anandarup Das; K. Gopakumar

2010-01-01

246

Smart Sensor for Online Detection of Multiple-Combined Faults in VSD-Fed Induction Motors  

PubMed Central

Induction motors fed through variable speed drives (VSD) are widely used in different industrial processes. Nowadays, the industry demands the integration of smart sensors to improve the fault detection in order to reduce cost, maintenance and power consumption. Induction motors can develop one or more faults at the same time that can be produce severe damages. The combined fault identification in induction motors is a demanding task, but it has been rarely considered in spite of being a common situation, because it is difficult to identify two or more faults simultaneously. This work presents a smart sensor for online detection of simple and multiple-combined faults in induction motors fed through a VSD in a wide frequency range covering low frequencies from 3 Hz and high frequencies up to 60 Hz based on a primary sensor being a commercially available current clamp or a hall-effect sensor. The proposed smart sensor implements a methodology based on the fast Fourier transform (FFT), RMS calculation and artificial neural networks (ANN), which are processed online using digital hardware signal processing based on field programmable gate array (FPGA).

Garcia-Ramirez, Armando G.; Osornio-Rios, Roque A.; Granados-Lieberman, David; Garcia-Perez, Arturo; Romero-Troncoso, Rene J.

2012-01-01

247

A Comprehensive Method for the Modeling of Axial Air-gap Eccentricities in Induction Motors  

Microsoft Academic Search

When speaking about the diagnostic and reliability of induction motor (IM), it is important to note that the modeling is a main step permitting to study the evolution laws of the faults related harmonics. This is the aim of many previous works, but only few attempts on axial air-gap eccentricity modeling can be found. This paper deals with a new

A. Ghoggal; M. Sahraoui; S. E. Zouzou

2009-01-01

248

Digital Simulation of Electronic Transformer based Single-phase Induction Motor Drive  

Microsoft Academic Search

This paper presents the modeling and digital simulation of an electric drive comprising of electronic transformer based voltage regulator and capacitor-run single- phase induction motor. The drive proposed is modeled and simulated using MATLAB\\/ SIMULINK. It is found that the proposed scheme has superior operating and performance characteristics, particularly on the aspects of power quality, energy saving and efficiency unlike

K. Samidurai; K. Thanushkodi

2010-01-01

249

Optimised solar water pumping system based on an induction motor driven centrifugal pump  

Microsoft Academic Search

Two power electronic interfaces, each forming a complete photovoltaic pumping system requiring an off-the-shelf induction motor driven submersible centrifugal pump have been developed. An in-depth study of the developed system has been carried out by simulation and field tests

C. V. Nayar; E. Vasu; S. J. Phillips

1993-01-01

250

Expert system based automated design technique of a voltage-fed inverter for induction motor drive  

Microsoft Academic Search

The authors describe expert-system-base automate design of a pulse width modulation (PWM) voltage fed inverter for an induction motor drive on the basis of design specifications provided by the user, who could be a skilled or a semiskilled designer. During a typical consultation with the expert system, the user undergoes an interactive dialogue session in simple English to supply the

Sunil M. Chhaya; Bimd K. Bose

1992-01-01

251

Investigation of motor characteristics when connected to a Nola controller  

SciTech Connect

Tests performed on Nola-type power factor controllers for induction motors are described. Emphasis on energy conservation during the past two years has prompted many manufactuers to apply to NASA for licenses to produce both single-phase and three-phase controllers of this type. Claims have been made extolling the energy savings possible through the use of these devices. Units have been produced to operate with motors from fractional horsepower size up to at least one hundred horsepower. It was the purpose of this investigation to examine the behavior and efficiency of representative controllers for motors of single-phase fractional horsepower and three-phase up to 25 horsepower. In so far as possible, normal installation and operating conditions were simulated. The controllers were initially adjusted according to manufacturer's instructions and tests were run under various conditions of load and input voltage to determine their operating characteristics. Most of the controllers tested were purchased at random from representative manufacturers. However, during the period of the investigation, several manufacturers loaned controllers to the project to be tested. Some of the controllers operated reasonably well while others could not be stabilized at all. Operating data have been included for those units which were stable and mention has been made of those which were not. No tests were made at other than normal laboratory ambient temperature of approximately 20/sup 0/C nor were any tests performed to check the possibility of resonance with other devices due to the harmonics induced in the voltage and/or current by the operation of the controller.

Not Available

1982-12-31

252

An auxiliary power supply based on the phase voltage ripple employed in a micro inverter for feeding three phase Tesla induction motor  

Microsoft Academic Search

This paper describes an auxiliary power supply employed to feed the control unit and gate drivers in a three-phase PWM micro inverter. The micro inverter feeds three-phase Tesla induction motor as mechanical actuator in small industrial water pumps. The proposed auxiliary power supply is based on a resonant serial half wave rectifier supplied from an output of the inverter. The

P. J. Grbovic; S. N. Vukosavic

2005-01-01

253

A current monitoring system for diagnosing electrical failures in induction motors  

NASA Astrophysics Data System (ADS)

Induction motors are critical components in industrial processes. A motor failure may yield an unexpected interruption at the industrial plant, with consequences in costs, product quality, and safety. Many of these faulty situations in three phase induction motors have an electrical reason. Among different detection approaches proposed in the literature, those based on stator current monitoring are advantageous due to its non-invasive properties. One of these techniques resorts to spectrum analysis of machine line current. Another non-invasive technique is the Extended Park's Vector Approach, which allows the detection of inter-turn short circuits in the stator winding. This article presents the development of an on-line current monitoring system that uses both techniques for fault detection and diagnosis in the stator and in the rotor. Based on experimental observations and on the knowledge of the electrical machine, a knowledge-based system was constructed in order to carry out the diagnosis task from these estimated data.

Acosta, G. G.; Verucchi, C. J.; Gelso, E. R.

2006-05-01

254

A New Soft Starting Method for Wound-Rotor Induction Motor  

NASA Astrophysics Data System (ADS)

Starting of a three-phase Induction motor using a starter rheostat in rotor circuit has some disadvantages. A new method for starting of a three-phase motor by using a parallel combination of resistors, self-inductors and capacitors in rotor circuit is proposed in this paper. The proposed method ensures the soft and higher starting torque as well as limited starting current as compared to shorted rotor method. The characteristic curves for both methods (shorted rotor and rotor with added elements) are provided. The mathematical model based on the steady-state equivalent circuit of the induction motor is expanded in frequency domain and the required computer program is prepared using an optimization method. The values for added elements to rotor circuit are calculated in such a way that minimum starting time considering current and torque limitations are achieved.

Sharifian, Mohammad Bagher Bannae; Feyzi, Mohammad Reza; Sabahi, Mehran; Farrokhifar, Meysam

2011-01-01

255

Dual-circuit segmented rail phased induction motor  

DOEpatents

An improved linear motor utilizes two circuits, rather that one circuit and an opposed plate, to gain efficiency. The powered circuit is a flat conductive coil. The opposed segmented rail circuit is either a plurality of similar conductive coils that are shorted, or a plurality of ladders formed of opposed conductive bars connected by a plurality of spaced conductors. In each embodiment, the conductors are preferably cables formed from a plurality of intertwined insulated wires to carry current evenly.

Marder, Barry M. (Albuquerque, NM); Cowan, Jr., Maynard (Albuquerque, NM)

2002-01-01

256

Induction of nitrotyrosine-like immunoreactivity in the lower motor neuron of amyotrophic lateral sclerosis  

Microsoft Academic Search

Spinal cords of sporadic cases with amyotrophic lateral sclerosis (ALS) and normal controls were immunohistochemically examined using antibodies for Cu\\/Zn superoxide dismutase (SOD) and nitrotyrosine (NT). Immunoreactivity for Cu\\/Zn SOD of the motor neurons was not different between the ALS and controls. In contrast, immunoreactivity for NT was densely detected in motor neurons of ALS but was not or was

K. Abe; L.-H. Pan; M. Watanabe; T. Kato; Y. Itoyama

1995-01-01

257

Modeling and Implementation for Embedded DC Motor Ethernet Control System  

E-print Network

Modeling and Implementation for Embedded DC Motor Ethernet Control System Lingbo Zhu, Guanzhong Dai of Embedded DC Motor Ethernet Control System is proposed with analysis on transmission time delay and data of the system. Keywords-Ethernet Control System(ECS); Embedded Linux; Delay; DC Motor I. INTRODUCTION

Paris-Sud XI, Université de

258

Parameter estimation of vector controlled induction machine  

E-print Network

constant of a machine has more deviant nature than the stator time constant. The former is also an Achilles' heal in maintaining a field oriented control because of the slip frequency calculation. Leakage inductance incase of a 4 pole machine may vary...

Rahman, Tahmid Ur

2002-01-01

259

Original Articles Geometric Control of Cardiomyogenic Induction  

E-print Network

embryonic stem cell (hESC) cardiac tissue development, and to test the hypothesis that hESC aggregate sizeOriginal Articles Geometric Control of Cardiomyogenic Induction in Human Pluripotent Stem Cells, an incomplete understanding of the cellular mechanisms underlying human pluripotent stem cell

Zandstra, Peter W.

260

Integrated control of axonemal dynein AAA(+) motors.  

PubMed

Axonemal dyneins are AAA(+) enzymes that convert ATP hydrolysis to mechanical work. This leads to the sliding of doublet microtubules with respect to each other and ultimately the generation of ciliary/flagellar beating. However, in order for useful work to be generated, the action of individual dynein motors must be precisely controlled. In addition, cells modulate the motility of these organelles through a variety of second messenger systems and these signals too must be integrated by the dynein motors to yield an appropriate output. This review describes the current status of efforts to understand dynein control mechanisms and their connectivity focusing mainly on studies of the outer dynein arm from axonemes of the unicellular biflagellate green alga Chlamydomonas. PMID:22406539

King, Stephen M

2012-08-01

261

Optimization of induction motor efficiency. Volume 3. Experimental comparison of three-phase standard motors with Wanlass motors. Final report  

SciTech Connect

Researchers conducted comprehensive laboratory tests to evaluate the effectiveness of the Wanlass connection in improving motor efficiency. On the basis of these tests, they found no reason to conclude that such a connection is more efficient than the standard connection.

Fuchs, E.F.

1985-12-01

262

Trade Electricity. Motors & Controls--Level 3. Standardized Curriculum.  

ERIC Educational Resources Information Center

This curriculum guide consists of seven modules on motors and controls, one of the three divisions of the standardized trade electricity curriculum in high schools in New York City. The seven modules cover the following subjects: energy conservation wiring, direct current (DC) motor repair and rewinding, DC motor controls, alternating current (AC)

New York City Board of Education, Brooklyn, NY. Office of Occupational and Career Education.

263

The Wanlass Polyphase Rotating Magnetic Device in Electric Motor and Induction Generator Applications  

E-print Network

THE WANLASS POLYPHASE ROTATING MAGNETIC DEVICE IN ELECTRIC MOTOR RND INDUCTION GENERATOR APPLICATIONS Donald E. Aso Wanlas5 COt~oQt'ation Carson Citv, Nevada The electric motor in its present technological configuration has remained... enet'gy SOUt'ces (low velocity winds, low pt'essur'e geothermal etc.l. Figure 13 plots the entire Speed-Out out curve from synchronous speed to well ab,:,ve set'vice factot', load. To access the Wanlass generator's low level threshold, figure 14...

Asp, D. E.

1984-01-01

264

An induction motor model for high-frequency torsional vibration analysis  

NASA Astrophysics Data System (ADS)

High-frequency torsional oscillations of a 50 horsepower (hp) induction motor are investigated up to approximately 30 kHz. It is experimentally determined that torsional oscillations, due to the switching harmonics of the motor drive, contribute significantly to the torsional oscillation of the output shaft. Two torsional vibration models are developed. One model assumes the rotor to be rigid, while the other has a compliant rotor. The compliant model allows for greater transmission of high-frequency oscillations, and a better prediction of the measured output shaft vibration.

Widdle, R. D.; Krousgrill, C. M.; Sudhoff, S. D.

2006-03-01

265

Balanced-Bridge Feedback Control Of Motor  

NASA Technical Reports Server (NTRS)

Sensitivity to variations in electrical and mechanical characteristics reduced. Proposed control system for motor-driven rotary actuator includes three nested feedback loops which, when properly designed, decoupled from each other. Intended to increase accuracy of control by mitigating such degrading effects as vibrations and variations in electrical and mechanical characteristics of structure rotated. Lends itself to optimization of performance via independent optimization of each of three loops. Includes outer, actuator, and driver feedback loops, configured so that actuator is subsystem, and driver is subsystem of actuator.

Lurie, Boris J.

1990-01-01

266

Development of Voltage Sag Compensator and UPS using a Flywheel Induction Motor and an Engine Generator  

NASA Astrophysics Data System (ADS)

Flywheel energy storage systems are focused as uninterruptible power supplies (UPS) from the viewpoint of environmental friendliness and high durability performance. Using a low-speed and heavy flywheel, and a low-cost squirrel-cage induction motor/generator, two applications are proposed; 1) 11kW voltage sag compensator using a capacitor self-excited induction generator without semiconductor converters; 2) UPS composed of the flywheel system and an engine generator. From some experimental results, an ideal voltage sag compensator and UPS are realized by the low-technology flywheel system.

Kato, Shuhei; Takaku, Taku; Sumitani, Hideo; Shimada, Ryuichi

267

Rotor cage fault diagnosis in three-phase induction motors, by Park`s vector approach  

SciTech Connect

The subject of on-line detection of rotor cage faults in three-phase induction motors is discussed, and a noninvasive approach, based on computer-aided monitoring of the stator current Parks` Vector, is introduced. Both simulation and laboratory tests results demonstrate the effectiveness of the proposed technique, for detecting broken rotor bars or end-rings in operating three-phase induction machines. On-site tests conducted in a power plant, using the diagnostic instrumentation system developed, are also reported.

Cardoso, A.J.M.; Cruz, S.M.A.; Saraiva, E.S. [Univ. de Coimbra (Portugal). Dept. de Engenharia Electrotechnica; Carvalho, J.F.S. [Inst. Superior de Engenharia de Coimbra (Portugal)

1995-12-31

268

Integrated-Circuit Controller For Brushless dc Motor  

NASA Technical Reports Server (NTRS)

Generic circuit performs commutation-logic and power-switching functions for control of brushless dc motor. Controller includes commutation-logic and associated control circuitry, power supply, and inverters containing power transistors. Major advantages of controller are size, weight, and power consumption can be made less than other brushless-dc-motor controllers.

Le, Dong Tuan

1994-01-01

269

Performance of station service induction motors following full load rejection of a nuclear generating unit  

SciTech Connect

In this paper the authors describe simulations, using EPRI`s Extended Transient Midterm Stability Program (ETMSP), which were performed to understand the nature of a failed load rejection test on a nuclear unit. The failure was a result of large induction motors stalling, causing protective relays to operate. Potential remedial measures were simulated and a final solution, using a temporary voltage boost on the AVR, adopted and implemented to prevent further failures.

Rogers, G.J.; Beaulieu, R.E.; Hajagos, L.M. [Ontario Hydro, Toronto, Ontario (Canada)] [Ontario Hydro, Toronto, Ontario (Canada)

1995-08-01

270

Economic aspects of minimising the effects of mechanical stress in induction motor stator cores  

NASA Astrophysics Data System (ADS)

The localised flux density distribution and corresponding localised iron loss of stacks of non-oriented, silicon free iron, induction motor stator laminations have been measured together with a finite element analysis of mechanical stress distribution caused by radial clamping. The results show the value of choosing an inner frame diameter large enough to avoid high compression in terms of an annual saving in the cost of core loss or a reduction in the stator conductor cross sectional area.

Moses, A. J.; Rahmatizadeh, H.

1992-07-01

271

Interturn stator winding fault diagnosis in three-phase induction motors, by Park's vector approach  

Microsoft Academic Search

The subject of on-line detection and location of inter-turn short circuits in the stator windings of three-phase induction motors is discussed, and a noninvasive approach, based on the computer-aided monitoring of the stator current Park's vector, is introduced. Experimental results, obtained by using a special fault producing test rig, demonstrate the effectiveness of the proposed technique, for detecting inter-turn stator

A. J. Marques Cardoso; S. M. A. Cruz; D. S. B. Fonseca

1999-01-01

272

Conducted electromagnetic emissions in induction motor drive systems. II. Frequency domain models  

Microsoft Academic Search

For pt.I see ibid., vol.13, no.4, p.757-67 (1998). Predicting conducted emissions in pulsewidth modulation (PWM) inverter induction motor drive systems requires various frequency-dependent effects to be considered. A frequency domain method has advantages in such cases compared to a time domain approach. Based on the modal analysis presented in Part I, this paper develops frequency domain models to evaluate the

L. Ran; S. Gokani; J. Clare; K. J. Bradley; C. Christopoulos

1998-01-01

273

Control of Surface Mounted Permanent Magnet Motors with Special Application to Fractional-Slot Motors with Concentrated Windings  

SciTech Connect

A 30 pole, 6 kW, and 6000 maximum revolutions per minute (rpm) prototype of the permanent magnet synchronous motor (PMSM) with fractional-slot concentrated windings (FSCW) has been designed, built, and tested at the University of Wisconsin at Madison (UWM). This machine has significantly more inductance than that of regular PMSMs. The prototype was delivered in April 2006 to the Oak Ridge National Laboratory (ORNL) for testing and development of a controller that will achieve maximum efficiency. In advance of the test/control development effort, ORNL has used the PMSM models developed over a number of previous studies to study how steady state performance of high inductance PMSM machines relates to control issues. This report documents the results of this research. The amount of inductance that enables the motor to achieve infinite constant power speed ratio (CPSR) is given by L{sub {infinity}} = E{sub b}/{Omega}{sub b}I{sub R}, where E{sub b} is the root-mean square (rms) magnitude of the line-to-neutral back-electromotive force (emf) at base speed, {Omega}{sub b} is the base speed in electrical radians per second, and I{sub R} is the rms current rating of the motor windings. The prototype machine that was delivered to ORNL has about 1.5 times as much inductance as a typical PMSM with distributed integral slot windings. The inventors of the FSCW method, who designed the prototype machine, remarked that they were 'too successful' in incorporating inductance into their machine and that steps would be taken to modify the design methodology to reduce the inductance to the optimum value. This study shows a significant advantage of having the higher inductance rather than the optimal value because it enables the motor to develop the required power at lower current thereby reducing motor and inverter losses and improving efficiency. The main problem found with high inductance machines driven by a conventional phase advance (CPA) method is that the motor current at high speed depends solely on machine parameters and is virtually independent of the load level and the direct current (dc) supply voltage. Thus, the motor current is virtually the same at no load as at full load resulting in poor efficiency at less than full load conditions. While an inductance higher than the value cited above is warranted, it still does not ensure that the motor current is proportional to load; consequently, the problem of low efficiency at high speed and partial load is not resolved but is only mitigated. A common definition of 'base speed' is the speed at which the voltage applied to the motor armature is equal to the magnitude of the back-emf. The results in this study indicate that the dc supply voltage should be adequate to drive rated current into the motor winding at the specified base speed. At a minimum this requires sufficient voltage to overcome not only the back-emf but also the voltage drop across the internal impedance of the machine. For a high inductance PMSM, the internal impedance at base speed can be considerable and substantial additional voltage is required to overcome the internal voltage drop. It is further shown that even more voltage than the minimum required for injecting rated current at base speed can be beneficial by allowing the required power to be developed at lower current, which reduces losses in the motor and inverter components. Further, it is shown that the current is minimized at a unique speed; consequently, there may be room for optimization if the drive spends a substantial amount of its operating life at a certain speed (for example 60 mph). In this study, fundamental frequency phasor models are developed for a synchronous PMSM and the control systems that drive them is CPA. The models were compared with detailed simulations to show their validity. The result was used to design a traction drive control system with optimized efficiency to drive the fractional-slot motor with concentrated windings. The goal is to meet or exceed the FreedomCAR inverter cost and performance targets.

McKeever, John W [ORNL; Patil, Niranjan [University of Tennessee, Knoxville (UTK); Lawler, Jack [ORNL

2007-07-01

274

Losses in chopper-controlled DC series motors  

NASA Technical Reports Server (NTRS)

Motors for electric vehicle (EV) applications must have different features than dc motors designed for industrial applications. The EV motor application is characterized by the following requirements: (1) the need for highest possible efficiency from light load to overload, for maximum EV range, (2) large short time overload capability (The ratio of peak to average power varies from 5/1 in heavy city traffic to 3/1 in suburban driving situations) and (3) operation from power supply voltage levels of 84 to 144 volts (probably 120 volts maximum). A test facility utilizing a dc generator as a substitute for a battery pack was designed and utilized. Criteria for the design of such a facility are presented. Two motors, differing in design detail, commercially available for EV use were tested. Losses measured are discussed, as are waves forms and their harmonic content, the measurements of resistance and inductance, EV motor/chopper application criteria, and motor design considerations.

Hamilton, H. B.

1982-01-01

275

Implementation of a New Torque and Flux Controllers for Direct Torque Control (DTC) of Induction Machine Utilizing Digital Signal Processor (DSP) and Field Programmable Gate Arrays (FPGA)  

Microsoft Academic Search

This paper presents the simulation and experimental results of a new torque and flux controllers for the direct torque control (DTC) of induction motor drives. The controllers provide a simple solution to the variable switching frequency and high torque ripples problems encountered in the hysteresis-based DTC drives. The controllers operate based on the comparison between the compensated error signals and

C. L. Toh; N. R. N. Idris; A. H. M. Yatim; N. D. Muhamad; M. Elbuluk

2005-01-01

276

Effect of Ferrite Magnetic Wedge on Capacitor Motor Characteristics in Triac Control  

NASA Astrophysics Data System (ADS)

Split-phase capacitor motors are commonly used to drive household electric appliances. The motor has some slots and teeth to embed electric conductors or coils. The presence of the slots and teeth induces the variation of magnetic reluctance through the magnetic circuit to introduce heavy pulsation of the air gap flux. Thus, the voltage, current and torque of the motor become oscillative to increase the electric power loss and finally to reduce the motor efficiency. First, the authors discuss the characteristics of a 3-phase cage-type induction motor in which the ferrite magnetic wedges have been installed into the stator slot openings of the motor to smooth the air gap flux pulsation and to decrease the electric power loss, resulting in improved motor efficiency. If the motor is driven by the voltage source in accordance with the loading condition, more economical operation will be achieved. In this study, a nonsinusoidal voltage controlled by the switching element of a triac has been applied to a capacitor motor with wedges of ferrite magnetic materials. This paper reports on the interesting results obtained.

Kaga, Akio; Anazawa, Yoshihisa; Tajima, Katsubumi

1991-07-01

277

Controller for a High-Power, Brushless dc Motor  

NASA Technical Reports Server (NTRS)

Driving and braking torques controllable. Control circuit operates 7-kW, 45-lb-ft (61-N-m), three-phase, brushless dc motor in both motor and generator modes. In motor modes, energy from power source is pulse-width modulated to motor through modified "H-bridge" circuit, in generator mode, energy from motor is pulse-width modulated into bank of load resistors to provide variable braking torques. Circuit provides high-resolution torque control in both directions over wide range of speeds and torques. Tested successfully at bus voltages up to 200 Vdc and currents up to 45 A.

Fleming, David J.; Makdad, Terence A.

1987-01-01

278

Proprioception and Motor Control in Parkinson's Disease  

Microsoft Academic Search

Parkinson's disease (PD) is a neurodegenerative disorder that leads to a progressive decline in motor function. Growing evidence indicates that PD patients also experience an array of sensory problems that negatively impact motor function. This is especially true for proprioceptive deficits, which profoundly degrade motor performance. This review specifically address the relation between proprioception and motor impairments in PD. It

Jrgen Konczak; Daniel M. Corcos; Fay Horak; Howard Poizner; Mark Shapiro; Paul Tuite; Jens Volkmann; Matthias Maschke

2009-01-01

279

Application to induction motor faults diagnosis of the amplitude recovery method combined with FFT  

NASA Astrophysics Data System (ADS)

This paper presents a signal processing method - amplitude recovery method (abbreviated to ARM) - that can be used as the signal pre-processing for fast Fourier transform (FFT) in order to analyze the spectrum of the other-order harmonics rather than the fundamental frequency in stator currents and diagnose subtle faults in induction motors. In this situation, the ARM functions as a filter that can filter out the component of the fundamental frequency from three phases of stator currents of the induction motor. The filtering result of the ARM can be provided to FFT to do further spectrum analysis. In this way, the amplitudes of other-order frequencies can be extracted and analyzed independently. If the FFT is used without the ARM pre-processing and the components of other-order frequencies, compared to the fundamental frequency, are fainter, the amplitudes of other-order frequencies are not able easily to extract out from stator currents. The reason is when the FFT is used direct to analyze the original signal, all the frequencies in the spectrum analysis of original stator current signal have the same weight. The ARM is capable of separating the other-order part in stator currents from the fundamental-order part. Compared to the existent digital filters, the ARM has the benefits, including its stop-band narrow enough just to stop the fundamental frequency, its simple operations of algebra and trigonometry without any integration, and its deduction direct from mathematics equations without any artificial adjustment. The ARM can be also used by itself as a coarse-grained diagnosis of faults in induction motors when they are working. These features can be applied to monitor and diagnose the subtle faults in induction motors to guard them from some damages when they are in operation. The diagnosis application of ARM combined with FFT is also displayed in this paper with the experimented induction motor. The test results verify the rationality and feasibility of the ARM. It should be clarified that the ARM must be applied in three phases of currents in electrical machines. For a single phase of alternating current or direct current, it can do nothing. However, since three-phase electrical machines have a dominant position in the application field in modern economic society and it is natural and convenient to acquire three phases of stator currents during the three-phase electrical machines are tested, it is necessary and meaningful to develop the ARM to diagnose and guard them.

Liu, Yukun; Guo, Liwei; Wang, Qixiang; An, Guoqing; Guo, Ming; Lian, Hao

2010-11-01

280

Three-phase Induction Motor Operation Trend Prediction Using Support Vector Regression for Condition-based Maintenance  

Microsoft Academic Search

Due to the broad employment and large amount of electricity consumption of induction motor, their efficient operation has been a focus for engineering research. The paper proposes a new integrated approach performing the motor condition prediction for the maintenance of low cost and high quality. Studies were done on nonlinear data analysis techniques, including particle filters for state estimates and

Yanfeng Li; Haibin Yu

2006-01-01

281

Direct self-control (DSC) of inverter-fed induction machine  

Microsoft Academic Search

The new direct self-control (DSC) is a simple method of signal processing that gives converter-fed three-phase machines an excellent dynamic performance. To control the torque of, say, an induction motor, it is sufficient to process the measured signals of the stator currents and the total flux linkages only. In the basic version of DSC, the power semiconductors of a three-phase

M. Depenbrock

1988-01-01

282

Neuromuscular modularity and behavioral correlates of motor control  

E-print Network

I studied organizational principles that may subserve the control and learning of forelimb movements. Among these principles, I focused on muscular coordination patterns, motor cortical excitability, and sensorimotor ...

Overduin, Simon Alexander

2006-01-01

283

ELEC-2913 - Motors & Controls for Electric Vehicles & Industrial Applications  

NSDL National Science Digital Library

This three credit course offeredat Macomb Community Collegeprovides an introduction toalternating current (AC)motors, AC motor controls, and AC motor applications tobattery electric and hybrid electric vehicles (BEVs and HEVs). Course topics include fundamental concepts of electricity and magnetism, AC motors, traction motors, AC synchronous permanent magnet motors, HEV/BEV energy storage and control systems, adjustable frequency drives, and modeling of various components associated with electric drivevehicles in MatLab and Simulink software. Included educational materials for this course are a syllabus and PowerPoint presentations. Homework assignments and exams are not included. This course is required as a part of MCCs Electric VehicleDevelopmentTechnology Certificate and the course outline is as follows: introduction to single-phase motors, motor operation theory, basic motor controls, introduction to three phase motors, three-phase motor controls, theory of operation for adjustable frequency drives, configuring drive parameters, simulation of parameters using MatLab software, and simulation of electric vehicle parameters using Simulink software.

284

Human Motor Computational Model Through Iterative Model Reference Adaptive Control  

E-print Network

the same voluntary action improves. This indicates that humans can learn from experience and adaptHuman Motor Computational Model Through Iterative Model Reference Adaptive Control Shou-Han Zhou reference adaptive control is proposed to capture the hypothesised mechanisms in human motor control

Melbourne, University of

285

Variable current speed controller for eddy current motors  

DOEpatents

A speed control system for eddy current motors is provided in which the current to the motor from a constant frequency power source is varied by comparing the actual motor speed signal with a setpoint speed signal to control the motor speed according to the selected setpoint speed. A three-phase variable voltage autotransformer is provided for controlling the voltage from a three-phase power supply. A corresponding plurality of current control resistors is provided in series with each phase of the autotransformer output connected to inputs of a three-phase motor. Each resistor is connected in parallel with a set of normally closed contacts of plurality of relays which are operated by control logic. A logic circuit compares the selected speed with the actual motor speed obtained from a digital tachometer monitoring the motor spindle speed and operated the relays to add or substract resistance equally in each phase of the motor input to vary the motor current to control the motor at the selected speed.

Gerth, H.L.; Bailey, J.M.; Casstevens, J.M.; Dixon, J.H.; Griffith, B.O.; Igou, R.E.

1982-03-12

286

Road load simulator tests of the Gould phase 1 functional model silicon controlled rectifier ac motor controller for electric vehicles  

NASA Technical Reports Server (NTRS)

The test results for a functional model ac motor controller for electric vehicles and a three-phase induction motor which were dynamically tested on the Lewis Research Center road load simulator are presented. Results show that the controller has the capability to meet the SAE-J227a D cycle test schedule and to accelerate a 1576-kg (3456-lb) simulated vehicle to a cruise speed of 88.5 km/hr (55 mph). Combined motor controller efficiency is 72 percent and the power inverter efficiency alone is 89 percent for the cruise region of the D cycle. Steady state test results for motoring, regeneration, and thermal data obtained by operating the simulator as a conventional dynamometer are in agreement with the contractor's previously reported data. The regeneration test results indicate that a reduction in energy requirements for urban driving cycles is attainable with regenerative braking. Test results and data in this report serve as a data base for further development of ac motor controllers and propulsion systems for electric vehicles. The controller uses state-of-the-art silicon controlled rectifier (SCR) power semiconductors and microprocessor-based logic and control circuitry. The controller was developed by Gould Laboratories under a Lewis contract for the Department of Energy's Electric and Hybrid Vehicle program.

Gourash, F.

1984-01-01

287

Motor control of Drosophila courtship song.  

PubMed

Many animals utilize acoustic signals-or songs-to attract mates. During courtship, Drosophila melanogaster males vibrate a wing to produce trains of pulses and extended tone, called pulse and sine song, respectively. Courtship songs in the genus Drosophila are exceedingly diverse, and different song features appear to have evolved independently of each other. How the nervous system allows such diversity to evolve is not understood. Here, we identify a wing muscle in D.melanogaster (hg1) that is uniquely male-enlarged. The hg1 motoneuron and the sexually dimorphic development of the hg1 muscle are required specifically for the sine component of the male song. In contrast, the motoneuron innervating a sexually monomorphic wing muscle, ps1, is required specifically for a feature of pulse song. Thus, individual wing motor pathways can control separate aspects of courtship song and may provide a "modular" anatomical substrate for the evolution of diverse songs. PMID:24183665

Shirangi, Troy R; Stern, David L; Truman, James W

2013-11-14

288

Limitations of simplified fuzzy logic controller for IPM motor drive  

Microsoft Academic Search

This paper explores the limitations of a simplified fuzzy logic based speed controller incorporating approximated maximum torque per ampere (MTPA) mode of operation of an interior permanent magnet synchronous motor (IPMSM) as compared to a nonsimplified fuzzy logic based system without MTPA mode operation. The fundamentals of fuzzy logic algorithms as related to motor control, applications, are illustrated. Nonlinear expressions

Casey Butt; M. A. Rahman

2004-01-01

289

A Digital Method for DC Motor Speed Control  

Microsoft Academic Search

A motor speed controller is presented using digital techniques to measure, compare, and correct motor speed. In the prototype model, the range of speed control is approximately 200 rpm to 3000 rpm. The digital approach eliminates measurement nonlinearity and makes the speed setting exactly reproducible. The prototype's steady-state error is less that 0.2% of maximum speed, and it is shown

Timothy J. Maloney; Fernando L. Alvarado

1976-01-01

290

Controlling An Inverter-Driven Three-Phase Motor  

NASA Technical Reports Server (NTRS)

Control system for three-phase permanent-magnet motor driven by linecommutated inverter uses signals generated by integrating back emf of each phase of motor. High-pass filter network eliminates low-frequency components from control loop while maintaining desired power factor.

Dolland, C.

1984-01-01

291

DWT analysis of numerical and experimental data for the diagnosis of dynamic eccentricities in induction motors  

NASA Astrophysics Data System (ADS)

The behaviour of an induction machine during a startup transient can provide useful information for the diagnosis of electromechanical faults. During this process, the machine works under high stresses and the effects of the faults may also be larger than those in steady-state. These facts may help to amplify the magnitude of the indicators of some incipient faults. In addition, fault components with frequencies dependant on the slip evolve in a particular way during that transient, a fact that allows the diagnosis of the corresponding fault and the discrimination between different faults. The discrete wavelet transform (DWT) is an ideal tool for analysing signals with frequency spectrum variable in time. Some research works have applied with success the DWT to the stator startup current in order to diagnose the presence of broken rotor bars in induction machines. However, few works have used this technique for the study of other common faults, such as eccentricities. In this work, time-frequency analysis of the stator startup current is carried out in order to detect the presence of dynamic eccentricities in an induction motor. For this purpose, the DWT is applied and wavelet signals at different levels are studied. Data are obtained from simulations, using a finite element (FE) model of an induction motor, which allows forcing several kinds of faults in the machine, and also from experimental tests. The results show the validity of the approach for detecting the fault and discriminating with respect to other failures, presenting for certain applications (or working conditions) some advantages over the traditional stationary analysis.

Antonino-Daviu, J.; Jover, P.; Riera, M.; Arkkio, A.; Roger-Folch, J.

2007-08-01

292

NEAR-SURFACE CONTROLLED-SOURCE ELECTROMAGNETIC INDUCTION  

E-print Network

NEAR-SURFACE CONTROLLED-SOURCE ELECTROMAGNETIC INDUCTION: BACKGROUND AND RECENT ADVANCES MARK E The controlled-source electromagnetic (CSEM) induction method is emerging as a leading geophysical technique knowledge of and control over the electromagnetic field transmitted into the ground and hence excludes

Meju, Max

293

DC motor proportional control system for orthotic devices  

NASA Technical Reports Server (NTRS)

Multi-channel proportional control system for operation of dc motors for use with externally-powered orthotic arm braces is described. Components of circuitry and principles of operation are described. Schematic diagram of control circuit is provided.

Blaise, H. T.; Allen, J. R.

1972-01-01

294

Improved SCR ac Motor Controller for Battery Powered Urban Electric Vehicles  

NASA Technical Reports Server (NTRS)

An improved ac motor controller, which when coupled to a standard ac induction motor and a dc propulsion battery would provide a complete electric vehicle power train with the exception of the mechanical transmission and drive wheels was designed. In such a system, the motor controller converts the dc electrical power available at the battery terminals to ac electrical power for the induction motor in response to the drivers commands. The performance requirements of a hypothetical electric vehicle with an upper weight bound of 1590 kg (3500 lb) were used to determine the power rating of the controller. Vehicle acceleration capability, top speed, and gradeability requisites were contained in the Society of Automotive Engineers (SAE) Schedule 227a(d) driving cycle. The important capabilities contained in this driving cycle are a vehicle acceleration requirement of 0 to 72.4 kmph (0 to 45 mph) in 28 seconds a top speed of 88.5 kmph (55 mph), and the ability to negotiate a 10% grade at 48 kmph (30 mph). A 10% grade is defined as one foot of vertical rise per 10 feet of horizontal distance.

Latos, T. S.

1982-01-01

295

Push-Pull Control of Motor Output  

PubMed Central

Inhibition usually decreases input-output excitability of neurons. If, however, inhibition is coupled to excitation in a push-pull fashion, where inhibition decreases as excitation increases, neuron excitability can be increased. Although the presence of push-pull organization has been demonstrated in single cells, its functional impact on neural processing depends on its effect on the system level. We studied push-pull in the motor output stage of the feline spinal cord, a system which hallows in dependent control of inhibitory and excitatory components. Push-pull organization was clearly present in ankle extensor motoneurons, producing increased peak to peak modulation of synaptic currents. The effect at the system level was equally strong. Independent control of the inhibitory component showed that the stronger the background of inhibition, the greater the peak force production. This illustrates the paradox at the heart of push-pull organization: increased force output can be achieved by increasing background inhibition to provide greater disinhibition. PMID:22457505

Johnson, Michael D.; Hyngstrom, Allison S.; Manuel, Marin; Heckman, C.J.

2012-01-01

296

ARDOLORES: an Arduino based motors control system for DOLORES  

NASA Astrophysics Data System (ADS)

We present ARDOLORES a custom made motor control system for the DOLORES instrument in use at the TNG telescope. ARDOLORES replaced the original PMAC based motor control system at a fraction of the cost. The whole system is composed by one master Arduino ONE with its Ethernet shield, to handle the communications with the external world through an Ethernet socket, and by one Arduino ONE with its custom motor shield for each axis to be controlled. The communication between the master and slaves Arduinos is made possible through the I2C bus. Also a Java web-service has been written to control the motors from an higher level and provides an external API for the scientific GUI. The system has been working since January 2012 handling the DOLORES motors and has demonstrated to be stable, reliable, and with easy maintenance in both the hardware and the software parts.

Gonzalez, Manuel; Ventura, H.; San Juan, J.; Di Fabrizio, L.

2014-07-01

297

Performance analysis of a novel fuzzy logic and MTPA based speed control for IPMSM drive with variable d- and q-axis inductances  

Microsoft Academic Search

This paper presents a novel speed control scheme of an Interior permanent magnet synchronous motor (IPMSM) using fuzzy logic controller considering variable direct and quadrature axis inductances. The fuzzy logic controller (FLC) has been designed on the basis of indirect vector control scheme of the IPMSM drive. The complete vector control scheme of the IPMSM drive incorporating the FLC is

M. S. Hossain; M. J. Hossain

2009-01-01

298

Regaining motor control in musician's dystonia by restoring sensorimotor organisation  

PubMed Central

Professional musicians are an excellent human model of long term effects of skilled motor training on the structure and function of the motor system. However, such effects are accompanied by an increased risk of developing motor abnormalities, in particular musician's dystonia. Previously we found that there was an expanded spatial integration of proprioceptive input into the hand area of motor cortex (sensorimotor organisation, SMO) in healthy musicians as tested with a transcranial magnetic stimulation (TMS) paradigm. In musician's dystonia, this expansion was even larger, resulting in a complete lack of somatotopic organisation. We hypothesised that the disordered motor control in musician's dystonia is a consequence of the disordered SMO. In the present paper we test this idea by giving pianists with musician's dystonia 15 min experience of a modified proprioceptive training task. This restored SMO towards that seen in healthy pianists. Crucially, motor control of the affected task improved significantly and objectively as measured with a MIDI piano, and the amount of behavioural improvement was significantly correlated to the degree of sensorimotor re-organisation. In healthy pianists and non-musicians, the SMO and motor performance remained essentially unchanged. These findings suggest a link between the differentiation of SMO in the hand motor cortex and the degree of motor control of intensively practiced tasks in highly skilled individuals. PMID:19923295

Rosenkranz, Karin; Butler, Katherine; Williamon, Aaron; Rothwell, John C.

2010-01-01

299

Regaining motor control in musician's dystonia by restoring sensorimotor organization.  

PubMed

Professional musicians are an excellent model of long-term motor learning effects on structure and function of the sensorimotor system. However, intensive motor skill training has been associated with task-specific deficiency in hand motor control, which has a higher prevalence among musicians (musician's dystonia) than in the general population. Using a transcranial magnetic stimulation paradigm, we previously found an expanded spatial integration of proprioceptive input into the hand motor cortex [sensorimotor organization (SMO)] in healthy musicians. In musician's dystonia, however, this expansion was even larger. Whereas motor skills of musicians are likely to be supported by a spatially expanded SMO, we hypothesized that in musician's dystonia this might have developed too far and now disrupts rather than assists task-specific motor control. If so, motor control should be regained by reversing the excessive reorganization in musician's dystonia. Here, we test this hypothesis and show that a 15 min intervention with proprioceptive input (proprioceptive training) restored SMO in pianists with musician's dystonia to the pattern seen in healthy pianists. Crucially, task-specific motor control improved significantly and objectively as measured with a MIDI (musical instrument digital interface) piano, and the amount of behavioral improvement was significantly correlated to the degree of sensorimotor reorganization. In healthy pianists and nonmusicians, the SMO and motor performance remained essentially unchanged. These findings suggest that the differentiation of SMO in the hand motor cortex and the degree of motor control of intensively practiced tasks are significantly linked and finely balanced. Proprioceptive training restored this balance in musician's dystonia to the behaviorally beneficial level of healthy musicians. PMID:19923295

Rosenkranz, Karin; Butler, Katherine; Williamon, Aaron; Rothwell, John C

2009-11-18

300

Position Sensorless Vector Control for Permanent Magnet Synchronous Motors Based on Maximum Torque Control Frame  

NASA Astrophysics Data System (ADS)

High efficiency drive can be achieved by the maximum torque-per-ampere (MTPA) control which used reluctance torque effectively. However, the calculations for estimating rotor position and for controlling the d-axis current are required. The motor parameters of inductance etc. that are easily affected by magnetic saturation are included in those calculations. This paper proposes a new MTPA control method, which is robust against changes of motor parameters caused by magnetic saturation. In addition, complex calculation for d-axis current or reference to the table is not necessary. In this method, we define a novel coordinate frame, which has one axis aligned with the current vector of the MTPA control, and estimate the frame directly. Because the parameter Lqm for estimating the frame is less affected by the magnetic saturation than the conventional Lq, the effect of magnetic saturation on the position estimation can be greatly suppressed. First, an extended electromotive force model based on the proposed frame and a parameter Lqm for an estimation of the frame are derived. Next, the effectiveness of this proposed method is confirmed by simulations and experiments.

Hida, Hajime; Tomigashi, Yoshio; Kishimoto, Keiji

301

Optimal feedback control as a theory of motor coordination  

Microsoft Academic Search

A central problem in motor control is understanding how the many biomechanical degrees of freedom are coordinated to achieve a common goal. An especially puzzling aspect of coordination is that behavioral goals are achieved reliably and repeatedly with movements rarely reproducible in their detail. Existing theoretical frameworks emphasize either goal achievement or the richness of motor variability, but fail to

Michael I. Jordan

2002-01-01

302

A robust MTPA controller for high efficiency IPM synchronous motor  

Microsoft Academic Search

In electric vehicles (EV), an interior permanent magnet (IPM) synchronous motor (IPMSM) is popularly used as traction motors. In order to make good dynamic characteristic and control characteristic, such as small overshoot, maximum torque output, optimum efficiency operation, good transient response and the ability of restraining gust disturbance law, this paper presents a new approach. This approach combines maximum torque

Jianping Wen; Binggang Cao

2009-01-01

303

The Design of Microcomputer Control System for Step Motor  

Microsoft Academic Search

The paper gives a control system for step motor with the core of AT89C51 singlechip. The system design includes hardware design and software design and the circuit design contains keyboard input, LED display, the state display of light emitting diode and alarm. The keyboard can be used to input operation parameters, start and close system. The motor drives the load

Tianxing Meng; Lanlan Yu

2009-01-01

304

Gestalt Principles in the Control of Motor Action  

ERIC Educational Resources Information Center

We argue that 4 fundamental gestalt phenomena in perception apply to the control of motor action. First, a motor gestalt, like a perceptual gestalt, is holistic in the sense that it is processed as a single unit. This notion is consistent with reaction time results indicating that all gestures for a brief unit of action must be programmed prior to

Klapp, Stuart T.; Jagacinski, Richard J.

2011-01-01

305

CONTROL OF MOTOR VEHICLE EMISSIONS - THE U.S. EXPERIENCE  

EPA Science Inventory

An historical overview of the U.S. experience with controlling emissions from highway motor vehicles is presented. he evolution of new motor vehicle emissions certification practice, end-of-assembly-line inspection, in-use surveillance and recall, inspection and maintenance, and ...

306

100% 100% 100% 100% Visual Performance Fields and Motor Control  

E-print Network

modifies both visually guided manual and occular motor responses. Sheliga, Craighero, Riggio & RizzolattiS 100% 100% 100% 100% neutral cue N W E peripheral cue Visual Performance Fields and Motor Control distributed across the visual field. · Performance field: Heterogeneities more pronounced with increasing

Carrasco, Marisa

307

Aging and Concurrent Task Performance: Cognitive Demand and Motor Control  

ERIC Educational Resources Information Center

A motor task that requires fine control of upper limb movements and a cognitive task that requires executive processing--first performing them separately and then concurrently--was performed by 18 young and 18 older adults. The motor task required participants to tap alternatively on two targets, the sizes of which varied systematically. The

Albinet, Cedric; Tomporowski, Phillip D.; Beasman, Kathryn

2006-01-01

308

A brushless dc spin motor for momentum exchange altitude control  

NASA Technical Reports Server (NTRS)

Brushless dc spin motor is designed to use Hall effect probes as means of revolving rotor position and controlling motor winding currents. This results in 3 to 1 reduction in watt-hours required for wheel acceleration, a 2 to 1 reduction in power to run wheel, and a 10 to 1 reduction in the electronics size and weight.

Stern, D.; Rosenlieb, J. W.

1972-01-01

309

Sequential control by speed drive for ac motor  

NASA Astrophysics Data System (ADS)

The speed drive for ac motor is widely used in the industrial field to allow direct control for the speed and torque without any feedback from the motor shaft. By using the ABB ACS800 speed drive unit, the speed and torque can be controlled using sequential control method. Sequential control is one of the application control method provided in the ABB ACS800 Drive, where a set of events or action performed in a particular order one after the other to control the speed and torque of the ac motor. It was claimed that sequential control method is using the preset seven constant speeds being provided in ABB ACS800 drive to control the speed and torque in a continuous and sequential manner. The characteristics and features of controlling the speed and torque using sequential control method can be investigated by observing the graphs and curves plotted which are obtained from the practical result. Sequential control can run either in the Direct Torque Control (DTC) or Scalar motor control mode. By using sequential control method, the ABB ACS800 drive can be programmed to run the motor automatically according to the time setting of the seven preset constant speeds. Besides, the intention of this project is to generate a new form of the experimental set up.

Barsoum, Nader

2012-11-01

310

Numerical investigation of optimal control of induction heating processes  

Microsoft Academic Search

We consider optimal control problems arising in induction heating processes. We are mainly concerned with two classes of these processes: uniform heating and metal hardening. The cost functions are chosen according to these classes. The control parameters are the inductor shape (assumed to be thin), the frequency, the current voltage and the heating duration. The induction heating model is a

Olivier Bodart; Anne-Valrie Boureau; Rachid Touzani

2001-01-01

311

3. Launch closure, close up of motor and controls, view ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. Launch closure, close up of motor and controls, view towards west - Ellsworth Air Force Base, Delta Flight, Launch Facility, On County Road T512, south of Exit 116 off I-90, Interior, Jackson County, SD

312

48. AUTOMATIC WATER CONTROL MOTOR DRIVE FOR NEEDLES CONSTRUCTION DETAILS, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

48. AUTOMATIC WATER CONTROL MOTOR DRIVE FOR NEEDLES CONSTRUCTION DETAILS, SANTA ANA RIVER NO. 2, JAN. 24, 1977. SCE drawing no. 455667-0. - Santa Ana River Hydroelectric System, SAR-2 Powerhouse, Redlands, San Bernardino County, CA

313

76. VIEW OF THE MOTOR CONTROL PANEL IN THE NORTH ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

76. VIEW OF THE MOTOR CONTROL PANEL IN THE NORTH SIDE OF THE EAST SERVICE BUILDING FOR DOROTHY SIX BLAST FURNACE. (Jet Lowe) - U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela River, Duquesne, Allegheny County, PA

314

Hardware Evolution of Analog Speed Controllers for a DC Motor  

NASA Technical Reports Server (NTRS)

This viewgraph presentation provides information on the design of analog speed controllers for DC motors on aerospace systems. The presentation includes an overview of controller evolution, evolvable controller configuration, an emphasis on proportion integral (PI) controllers, schematic diagrams, and experimental results.

Gwaltney, David A.; Ferguson, Michael I.

2003-01-01

315

Mountain Plains Learning Experience Guide: Electric Motor Repair.  

ERIC Educational Resources Information Center

This Electric Motor Repair Course is designed to provide the student with practical information for winding, repairing, and troubleshooting alternating current and direct current motors, and controllers. The course is comprised of eight units: (1) Electric Motor Fundamentals, (2) Rewinding, (3) Split-phase Induction Motors, (4) Capacitor Motors,

Ziller, T.

316

A motor drive control system for the Lidar Polarimeter  

E-print Network

. The advent of the silicon controlled rectifier (SCR) and modern solid state electronic had ren- dered the Ward-Leonard system obsolete. The following is an overview of the design criteria applicable to a DC variable speed motor drive with dual...A MOTOR DRIVE CONTROL SYSTEM FOR THE LIDAR POLARIMETER A Thesis by Waiming Leung Submitted to the Graduate College of Texas A/M University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCF, May 1977 Major...

Leung, Waiming

1977-01-01

317

Design of a microprocessor based novel braking of three phase induction motor  

SciTech Connect

This paper describes the development of an efficient braking system suitable for three phase induction motor drives specially driving loads of non-overhauling type. The method incorporates a combination of three braking methods in four states according to the speed range at which the respective methods are most effective, with the result of a smooth and efficient braking. First capacitor self-excitation is applied in stages followed by magnetic braking by double short circuiting and dc injection. Theoretical and experimental results for determining different parameters useful for designing the braking scheme are provided. Lastly microprocessor has been used for proper incorporation of different braking schemes. Dual switching scheme has improved the reliability of the scheme.

Sinha, N.; Laskar, S.H.; Goyal, K.; Nair, P.B.; Sharma, M.K. [Regional Engineering Coll., Silchar (India)

1995-12-31

318

Induction Motor Fault Diagnosis Using a Hilbert-Park Lissajou's Curve Analysis and Neural Network-Based Decision  

E-print Network

Induction Motor Fault Diagnosis Using a Hilbert-Park Lissajou's Curve Analysis and Neural Network propose an original fault signature based on the Hilbert-Park Lissajou's curve analysis. The performances used. The proposed fault signature does not require a long temporal recording, and their processing

Paris-Sud XI, Université de

319

A new approach for fault detection of broken rotor bars in induction motor based on support vector machine  

Microsoft Academic Search

In this paper, a new approach is proposed to perform broken rotor bar fault detection in induction motors using of support vector machine (SVM) classifier. New features such as harmonic curve area, harmonic crest angle and harmonic amplitude have been extracted from power spectral density (PSD) of stator current in steady state condition using of Fast Fourier Transform (FFT). It

Mahdi Gordi Armaki; Reza Roshanfekr

2010-01-01

320

The Advantages of Ball Bearings and Their Application on Large-Horsepower High-Speed Horizontal Induction Motors  

Microsoft Academic Search

Many of today's specifications continue to limit the use of ball bearings on induction motor drives to on or below 200 hp. Advances in bearing technology and manufacture, along with increased bearing selection and application knowhow, have greatly increased the horsepower range over which ball bearings may be reliably used. Many performance and operational advantages are enjoyed through the use

Robert J. Brozek; James J. Bonner

1971-01-01

321

Introduction to API Standard 541, 4th edition-form-wound squirrel cage induction motors-larger than 500 horsepower  

Microsoft Academic Search

API Standard 541 is the premier large induction motor specification, originally created for refining service, but now applied by many companies in a wide range of industries. The 4th edition of this Standard has been released, and has many changes and improvements over previous editions. This paper reviews the significant changes relative to the 3rd edition. In addition, major specification

M. M. Hodowanec; M. J. Costello; B. Lockley; J. Rama; T. Griffith

2003-01-01

322

Multilevel dodecagonal space vector generation for Open-end winding induction motor drive using conventional three level inverters  

Microsoft Academic Search

A novel dodecagonal space vector structure for induction motor drive is presented in this paper. It consists of two dodecagons, with the radius of the outer one twice the inner one. Compared to existing dodecagonal space vector structures, to achieve the same PWM output voltage quality, the proposed topology lowers the switching frequency of the inverters and reduces the device

Anandarup Das; K. Sivakumar; Rijil Ramchand; Chintan Patel; K. Gopakumar

2009-01-01

323

Empirical mode decomposition and neural networks on FPGA for fault diagnosis in induction motors.  

PubMed

Nowadays, many industrial applications require online systems that combine several processing techniques in order to offer solutions to complex problems as the case of detection and classification of multiple faults in induction motors. In this work, a novel digital structure to implement the empirical mode decomposition (EMD) for processing nonstationary and nonlinear signals using the full spline-cubic function is presented; besides, it is combined with an adaptive linear network (ADALINE)-based frequency estimator and a feed forward neural network (FFNN)-based classifier to provide an intelligent methodology for the automatic diagnosis during the startup transient of motor faults such as: one and two broken rotor bars, bearing defects, and unbalance. Moreover, the overall methodology implementation into a field-programmable gate array (FPGA) allows an online and real-time operation, thanks to its parallelism and high-performance capabilities as a system-on-a-chip (SoC) solution. The detection and classification results show the effectiveness of the proposed fused techniques; besides, the high precision and minimum resource usage of the developed digital structures make them a suitable and low-cost solution for this and many other industrial applications. PMID:24678281

Camarena-Martinez, David; Valtierra-Rodriguez, Martin; Garcia-Perez, Arturo; Osornio-Rios, Roque Alfredo; Romero-Troncoso, Rene de Jesus

2014-01-01

324

Empirical Mode Decomposition and Neural Networks on FPGA for Fault Diagnosis in Induction Motors  

PubMed Central

Nowadays, many industrial applications require online systems that combine several processing techniques in order to offer solutions to complex problems as the case of detection and classification of multiple faults in induction motors. In this work, a novel digital structure to implement the empirical mode decomposition (EMD) for processing nonstationary and nonlinear signals using the full spline-cubic function is presented; besides, it is combined with an adaptive linear network (ADALINE)-based frequency estimator and a feed forward neural network (FFNN)-based classifier to provide an intelligent methodology for the automatic diagnosis during the startup transient of motor faults such as: one and two broken rotor bars, bearing defects, and unbalance. Moreover, the overall methodology implementation into a field-programmable gate array (FPGA) allows an online and real-time operation, thanks to its parallelism and high-performance capabilities as a system-on-a-chip (SoC) solution. The detection and classification results show the effectiveness of the proposed fused techniques; besides, the high precision and minimum resource usage of the developed digital structures make them a suitable and low-cost solution for this and many other industrial applications. PMID:24678281

Garcia-Perez, Arturo; Osornio-Rios, Roque Alfredo; Romero-Troncoso, Rene de Jesus

2014-01-01

325

Control of power to an inductively heated part  

DOEpatents

A process for induction hardening a part to a desired depth with an AC signal applied to the part from a closely coupled induction coil includes measuring the voltage of the AC signal at the coil and the current passing through the coil; and controlling the depth of hardening of the part from the measured voltage and current. The control system determines parameters of the part that are functions of applied voltage and current to the induction coil, and uses a neural network to control the application of the AC signal based on the detected functions for each part.

Adkins, Douglas R. (1620 Adelita Dr. NE., Albuquerque, NM 87112); Frost, Charles A. (1039 Red Oaks Loop NE., Albuquerque, NM 87122); Kahle, Philip M. (528 Longwood Loop NE., Rio Rancho, NM 87124); Kelley, J. Bruce (13200 Blue Corn Maiden Trail NE., Albuquerque, NM 87112); Stanton, Suzanne L. (2805 Palo Alto NE., Albuquerque, NM 87112)

1997-01-01

326

Distributed Motor Controller (DMC) for Operation in Extreme Environments  

NASA Technical Reports Server (NTRS)

This paper presents an extreme environment capable Distributed Motor Controller (DMC) module suitable for operation with a distributed architecture of future spacecraft systems. This motor controller is designed to be a bus-based electronics module capable of operating a single Brushless DC motor in extreme space environments: temperature (-120 C to +85 C required, -180 C to +100 C stretch goal); radiation (>;20K required, >;100KRad stretch goal); >;360 cycles of operation. Achieving this objective will result in a scalable modular configuration for motor control with enhanced reliability that will greatly lower cost during the design, fabrication and ATLO phases of future missions. Within the heart of the DMC lies a pair of cold-capable Application Specific Integrated Circuits (ASICs) and a Field Programmable Gate Array (FPGA) that enable its miniaturization and operation in extreme environments. The ASICs are fabricated in the IBM 0.5 micron Silicon Germanium (SiGe) BiCMOS process and are comprised of Analog circuitry to provide telemetry information, sensor interface, and health and status of DMC. The FPGA contains logic to provide motor control, status monitoring and spacecraft interface. The testing and characterization of these ASICs have yielded excellent functionality in cold temperatures (-135 C). The DMC module has demonstrated successful operation of a motor at temperature.

McKinney, Colin M.; Yager, Jeremy A.; Mojarradi, Mohammad M.; Some, Rafi; Sirota, Allen; Kopf, Ted; Stern, Ryan; Hunter, Don

2012-01-01

327

Remote control of molecular motors using light-activated gearshifting  

NASA Astrophysics Data System (ADS)

Engineering molecular motors with dynamically controllable properties will allow selective perturbation of mechanical processes in vivo and provide sophisticated components for directed nanoscale transport in vitro. We previously constructed myosin motors that respond to a change in [Ca++] by reversing their direction of motion along the polarized actin filament [1]. To expand the potential applications of controllable molecular motors, we have now developed myosins that shift gears in response to blue light illumination. Light is a versatile control signal that can be readily modulated in time and space, and is generally orthogonal to cellular signaling. Using structure-guided protein engineering, we have incorporated LOV photoreceptor domains into the lever arms of chimeric myosins, resulting in motors that robustly speed up, slow down, or switch directions upon illumination. These genetically encoded motors should be directly deployable inside living cells. Our successful designs include constructs based on two different myosin classes, and we show that optical velocity control can be implemented in motors that move at microns/sec speeds, enabling practical biological and bioengineering applications.[4pt] [1] Chen, L., Nakamura, M., Schindler,T.D., and Bryant Z. (2012). Nat. Nanotechnol. 7, 252-6.

Bryant, Zev

2013-03-01

328

A comparison of motor submodels in the optimal control model  

NASA Technical Reports Server (NTRS)

Properties of several structural variations in the neuromotor interface portion of the optimal control model (OCM) are investigated. For example, it is known that commanding control-rate introduces an open-loop pole at S=O and will generate low frequency phase and magnitude characteristics similar to experimental data. However, this gives rise to unusually high sensitivities with respect to motor and sensor noise-ratios, thereby reducing the models' predictive capabilities. Relationships for different motor submodels are discussed to show sources of these sensitivities. The models investigated include both pseudo motor-noise and actual (system driving) motor-noise characterizations. The effects of explicit proprioceptive feedback in the OCM is also examined. To show graphically the effects of each submodel on system outputs, sensitivity studies are included, and compared to data obtained from other tests.

Lancraft, R. E.; Kleinman, D. L.

1978-01-01

329

Hybrid circuit modules for motor commutation and control  

NASA Technical Reports Server (NTRS)

Thick film hybrid techniques are used to develop circuitry for a brushless dc motor commutator. The power commutator contains the driving circuit and an amplifier that controls the armature current. A position decoder contains digital integrated circuits which receive the signals from the armature position sensors and generate the driving signals for the power commutator in the proper sequence. These units drive motors with stall currents up to about 400 mA.

Dekramer, C.

1972-01-01

330

High power density superconducting motor for control applications  

NASA Astrophysics Data System (ADS)

A high dynamics superconducting low power motor for control applications has been considered for design. The rotor is cylindrical with machined bulks that generate the field by trapping flux in a four poles configuration. The toothless iron armature is wound by copper, acting iron only as magnetic screen. Details of the magnetic assembling, cryogenics and electrical supply conditioning will be reported. Improvements due to the use of a superconducting set are compared with performances of equivalent conventional motors.

Lpez, J.; Granados, X.; Lloberas, J.; Torres, R.; Grau, J.; Maynou, R.; Bosch, R.

2008-02-01

331

Advanced dc motor controller for battery-powered electric vehicles  

NASA Technical Reports Server (NTRS)

A motor generation set is connected to run from the dc source and generate a voltage in the traction motor armature circuit that normally opposes the source voltage. The functional feasibility of the concept is demonstrated with tests on a Proof of Principle System. An analog computer simulation is developed, validated with the results of the tests, applied to predict the performance of a full scale Functional Model dc Controller. The results indicate high efficiencies over wide operating ranges and exceptional recovery of regenerated energy. The new machine integrates both motor and generator on a single two bearing shaft. The control strategy produces a controlled bidirectional plus or minus 48 volts dc output from the generator permitting full control of a 96 volt dc traction motor from a 48 volt battery, was designed to control a 20 hp traction motor. The controller weighs 63.5 kg (140 lb.) and has a peak efficiency of 90% in random driving modes and 96% during the SAE J 227a/D driving cycle.

Belsterling, C. A.

1981-01-01

332

Hardware Evolution of Analog Speed Controllers for a DC Motor  

NASA Technical Reports Server (NTRS)

Evolvable hardware provides the capability to evolve analog circuits to produce amplifier and filter functions. Conventional analog controller designs employ these same functions. Analog controllers for the control of the shaft speed of a DC motor are evolved on an evolvable hardware platform utilizing a Field Programmable Transistor Array (FPTA). The performance of these evolved controllers is compared to that of a conventional proportional-integral (PI) controller.

Gwaltney, David A.; Ferguson, Michael I.

2003-01-01

333

New Technique of High-Performance Torque Control Developed for Induction Machines  

NASA Technical Reports Server (NTRS)

Two forms of high-performance torque control for motor drives have been described in the literature: field orientation control and direct torque control. Field orientation control has been the method of choice for previous NASA electromechanical actuator research efforts with induction motors. Direct torque control has the potential to offer some advantages over field orientation, including ease of implementation and faster response. However, the most common form of direct torque control is not suitable for the highspeed, low-stator-flux linkage induction machines designed for electromechanical actuators with the presently available sample rates of digital control systems (higher sample rates are required). In addition, this form of direct torque control is not suitable for the addition of a high-frequency carrier signal necessary for the "self-sensing" (sensorless) position estimation technique. This technique enables low- and zero-speed position sensorless operation of the machine. Sensorless operation is desirable to reduce the number of necessary feedback signals and transducers, thus improving the reliability and reducing the mass and volume of the system. This research was directed at developing an alternative form of direct torque control known as a "deadbeat," or inverse model, solution. This form uses pulse-width modulation of the voltage applied to the machine, thus reducing the necessary sample and switching frequency for the high-speed NASA motor. In addition, the structure of the deadbeat form allows the addition of the high-frequency carrier signal so that low- and zero-speed sensorless operation is possible. The new deadbeat solution is based on using the stator and rotor flux as state variables. This choice of state variables leads to a simple graphical representation of the solution as the intersection of a constant torque line with a constant stator flux circle. Previous solutions have been expressed only in complex mathematical terms without a method to clearly visualize the solution. The graphical technique allows a more insightful understanding of the operation of the machine under various conditions.

Kenny, Barbara H.

2003-01-01

334

Position and Speed Sensorless Control System of Permanent Magnet Synchronous Motor with Parameter Identification  

NASA Astrophysics Data System (ADS)

The model parameters of permanent magnet synchronous motor (PMSM) are required for a high-performance control and a model based sensorless control. This paper proposes the sensorless control system of PMSM that doesn't need parametric information beforehand. The parameters of PMSM drive system including inverter are identified at standstill and operating condition. At first, the initial rotor position is estimated by a signal injection sensorless scheme, in which the machine parameters are not required. After the initial position has been estimated, the resistance including on-resistance of IGBT, the voltage error caused by dead-time of inverter, d-axis and q-axis inductances are identified at standstill. After the motor starts by the signal injection sensorless control, the sensorless scheme changes to an extended EMF estimation based scheme. The estimated parameters of resistance, d-axis and q-axis inductances are used in such sensorless control. The magnet flux-linkage, which can not be estimated at standstill, is identified under the sensorless operation at medium and high speeds. The effectiveness of the proposed method is verified by several experimental results.

Morimoto, Shigeo; Shimmei, Akihide; Sanada, Masayuki; Takeda, Yoji

335

Laryngeal Motor Cortex and Control of Speech in Humans  

PubMed Central

Speech production is one of the most complex and rapid motor behaviors and involves a precise coordination of over 100 laryngeal, orofacial and respiratory muscles. Yet, we lack a complete understanding of laryngeal motor cortical control during production of speech and other voluntary laryngeal behaviors. In recent years, a number of studies have confirmed the laryngeal motor cortical representation in humans and provided some information about its interactions with other cortical and subcortical regions that are principally involved in vocal motor control of speech production. In this review, we discuss the organization of the peripheral and central laryngeal control based on neuroimaging and electrical stimulation studies in humans and neuroanatomical tracing studies in non-human primates. We hypothesize that the location of the laryngeal motor cortex in the primary motor cortex and its direct connections with the brainstem laryngeal motoneurons in humans, as oppose to its location in the premotor cortex with only indirect connections to the laryngeal motoneurons in non-human primates, may represent one of the major evolutionary developments in humans towards the ability to speak and vocalize voluntarily. PMID:21362688

Simonyan, Kristina; Horwitz, Barry

2011-01-01

336

Adaptive Fuzzy Control of a Direct Drive Motor  

NASA Technical Reports Server (NTRS)

This paper presents a state feedback adaptive control method for position and velocity control of a direct drive motor. The proposed control scheme allows for integrating heuristic knowledge with mathematical knowledge of a system. It performs well even when mathematical model of the system is poorly understood. The controller consists of an adaptive fuzzy controller and a supervisory controller. The supervisory controller requires only knowledge of the upper bound and lower bound of the system parameters. The fuzzy controller is based on fuzzy basis functions and states of the system. The adaptation law is derived based on the Lyapunov function which ensures that the state of the system asymptotically approaches zero. The proposed controller is applied to a direct drive motor with payload and parameter uncertainty, and the effectiveness is verified by simulation results.

Medina, E.; Kim, Y. T.; Akbaradeh-T., M. -R.

1997-01-01

337

Adaptive Fuzzy Control of a Direct Drive Motor: Experimental Aspects  

NASA Technical Reports Server (NTRS)

This paper presents a state feedback adaptive control method for position and velocity control of a direct drive motor. The proposed control scheme allows for integrating heuristic knowledge with mathematical knowledge of a system. It performs well even when mathematical model of the system is poorly understood. The controller consists of an adaptive fuzzy controller and a supervisory controller. The supervisory controller requires only knowledge of the upper bound and lower bound of the system parameters. The fuzzy controller is based on fuzzy basis functions and states of the system. The adaptation law is derived based on the Lyapunov function which ensures that the state of the system asymptotically approaches zero. The proposed controller is applied to a direct drive motor with payload and parameter uncertainty, and the effectiveness is experimentally verified. The real-time performance is compared with simulation results.

Medina, E.; Akbarzadeh-T, M.-R.; Kim, Y. T.

1998-01-01

338

The minimum transition hypothesis for intermittent hierarchical motor control  

PubMed Central

In intermittent control, instead of continuously calculating the control signal, the controller occasionally changes this signal at certain sparse points in time. The control law may include feedback, adaptation, optimization, or any other control strategies. When, where, and how does the brain employ intermittency as it controls movement? These are open questions in motor neuroscience. Evidence for intermittency in human motor control has been repeatedly observed in the neural control of movement literature. Moreover, some researchers have provided theoretical models to address intermittency. Even so, the vast majority of current models, and I would dare to say the dogma in most of the current motor neuroscience literature involves continuous control. In this paper, I focus on an area in which intermittent control has not yet been thoroughly considered, the structure of muscle synergies. A synergy in the muscle space is a group of muscles activated together by a single neural command. Under the assumption that the motor control is intermittent, I present the minimum transition hypothesis (MTH) and its predictions with regards to the structure of muscle synergies. The MTH asserts that the purpose of synergies is to minimize the effort of the higher level in the hierarchy by minimizing the number of transitions in an intermittent control signal. The implications of the MTH are not only for the structure of the muscle synergies but also to the intermittent and hierarchical nature of the motor system, with various predictions as to the process of skill learning, and important implications to the design of brain machine interfaces and human robot interaction. PMID:23450266

Karniel, Amir

2013-01-01

339

Detail of field breakers in the motor control cabinet for ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail of field breakers in the motor control cabinet for unit 3. Control cabinet and breaker panel built by Cutler-Hammer - Wellton-Mohawk Irrigation System, Pumping Plant No. 1, Bounded by Gila River & Union Pacific Railroad, Wellton, Yuma County, AZ

340

Gain scheduled sensorless control of a synchronous reluctance motor  

Microsoft Academic Search

Presented in this paper is an extension to previous work on observer-based sensorless control of synchronous reluctance motors. The extensions include a systematic observer gain calculation that facilitates the use of gain scheduling to improve the transient response of the observer over a wide speed range and improve the low speed performance of the closed-loop sensorless controller. Laboratory experiments are

Matthew B. Hortman; David G. Taylor

2004-01-01

341

Output feedback adaptive robust precision motion control of linear motors  

Microsoft Academic Search

This paper studies high performance robust motion control of linear motors that have a negligible electrical dynamics. A discontinuous projection based adaptive robust controller (ARC) is constructed. Since only output signal is available for measurement, an observer is first designed to provide exponentially convergent estimates of the unmeasurable states. This observer has an extended filter structure so that on-line parameter

Li Xu; Bin Yao

2001-01-01

342

Engineering controllable bidirectional molecular motors based on myosin  

NASA Astrophysics Data System (ADS)

Cytoskeletal motors drive the transport of organelles and molecular cargoes within cells and have potential applications in molecular detection and diagnostic devices. Engineering molecular motors with controllable properties will allow selective perturbation of mechanical processes in living cells and provide optimized device components for tasks such as molecular sorting and directed assembly. Biological motors have previously been modified by introducing activation/deactivation switches that respond to metal ions and other signals. Here, we show that myosin motors can be engineered to reversibly change their direction of motion in response to a calcium signal. Building on previous protein engineering studies and guided by a structural model for the redirected power stroke of myosin VI, we have constructed bidirectional myosins through the rigid recombination of structural modules. The performance of the motors was confirmed using gliding filament assays and single fluorophore tracking. Our strategy, in which external signals trigger changes in the geometry and mechanics of myosin lever arms, should make it possible to achieve spatiotemporal control over a range of motor properties including processivity, stride size and branchpoint turning.

Chen, Lu; Nakamura, Muneaki; Schindler, Tony D.; Parker, David; Bryant, Zev

2012-04-01

343

Digital Control Technology of Bearingless Permanent Magnet Synchronous Motor  

Microsoft Academic Search

\\u000a The digital control technology of a bearingless permanent magnet synchronous motor (BPMSM) includes torque control technology\\u000a and radial suspension force control technology. On the basis of explaining the producing principle of radial suspension forces,\\u000a electromagnetic torque equation and radial suspension force equations of the BPMSM are given. Based on the functional block\\u000a diagram of the BPMSM control system, optimized software

Jinfu Wei; Jing Yu; Qiuliang Cheng; Huangqiu Zhu; Zebin Yang

344

Motor control of the hands: the effect of familial sinistrality.  

PubMed

Left- and right-handed subjects, selected on the basis of degree of hand preference and for the presence or absence of familial sinistrality, responded to monaurally presented tonal stimuli (440 Hz note played on four different instruments) using their right and left hands on separate occasions. It was found that in both the strong left-handers and the inconsistent strong right-handers, motor control of the hands was related to familial sinistrality (FS). Specifically, strong left-handers and inconsistent strong right-handers with FS have a difference in the motor control of the hands in the left hemisphere, with a left hemisphere-left hand advantage. Strong left-handers and inconsistent strong right-handers with no FS have a difference in the motor control of the hands in the right hemisphere, with a right hemisphere-left hand advantage. PMID:11697209

Keane, A M

2001-09-01

345

Active Fault Tolerant Control for Ultrasonic Piezoelectric Motor  

NASA Astrophysics Data System (ADS)

Ultrasonic piezoelectric motor technology is an important system component in integrated mechatronics devices working on extreme operating conditions. Due to these constraints, robustness and performance of the control interfaces should be taken into account in the motor design. In this paper, we apply a new architecture for a fault tolerant control using Youla parameterization for an ultrasonic piezoelectric motor. The distinguished feature of proposed controller architecture is that it shows structurally how the controller design for performance and robustness may be done separately which has the potential to overcome the conflict between performance and robustness in the traditional feedback framework. A fault tolerant control architecture includes two parts: one part for performance and the other part for robustness. The controller design works in such a way that the feedback control system will be solely controlled by the proportional plus double-integral PI2 performance controller for a nominal model without disturbances and H? robustification controller will only be activated in the presence of the uncertainties or an external disturbances. The simulation results demonstrate the effectiveness of the proposed fault tolerant control architecture.

Boukhnifer, Moussa

2012-07-01

346

On-line current monitoring fault diagnosis in HV induction motors - Case histories and cost savings in offshore installations  

SciTech Connect

This paper presents an on-line current monitoring system for detecting rotor faults in large high voltage 3-phase induction motors. The philosophy and practical advantages of current monitoring are discussed and samples of on-site case histories verify the effectiveness of the method for detecting broken rotor bars and air-gap eccentricity in the industrial environment. A new computerized diagnostic system with expert system capability is also described.

Thomson, W.T.; Chalmers, S.J.; Rankin, D.R.

1987-01-01

347

Attentional Control Theory: Anxiety, Emotion, and Motor Planning  

PubMed Central

The present study investigated how trait anxiety alters the balance between attentional control systems to impact performance of a discrete preplanned goal-directed motor task. Participants executed targeted force contractions (engaging the goal-directed attentional system) at the offset of emotional and non-emotional distractors (engaging the stimulus-driven attentional system). High and low anxious participants completed the protocol at two target force levels (10% and 35% of maximum voluntary contraction). Reaction time (RT), performance accuracy, and rate of change of force were calculated. Expectations were confirmed at the 10% but not the 35% target force level: 1) high anxiety was associated with slower RTs, and 2) threat cues lead to faster RTs independently of trait anxiety. These new findings suggest that motor efficiency, but not motor effectiveness is compromised in high relative to low anxious individuals. We conclude that increased stimulus-driven attentional control interferes with movements that require greater attentional resources. PMID:19674869

Coombes, Stephen A.; Higgins, Torrie; Gamble, Kelly M.; Cauraugh, James H.; Janelle, Christopher M.

2009-01-01

348

Comparison of experimental and theoretical reaction rail currents, rail voltages, and airgap fields for the linear induction motor research vehicle  

NASA Technical Reports Server (NTRS)

Measurements of reaction rail currents, reaction rail voltages, and airgap magnetic fields in tests of the Linear Induction Motor Research Vehicle (LIMRV) were compared with theoretical calculations from the mesh/matrix theory. It was found that the rail currents and magnetic fields predicted by the theory are within 20 percent of the measured currents and fields at most motor locations in most of the runs, but differ by as much as a factor of two in some cases. The most consistent difference is a higher experimental than theoretical magnetic field near the entrance of the motor and a lower experimental than theoretical magnetic field near the exit. The observed differences between the theoretical and experimental magnetic fields and currents do not account for the differences of as much as 26 percent between the theoretical and experimental thrusts.

Elliott, D. G.

1977-01-01

349

Acceleration test for small three-phase integral horsepower induction motors-techniques, limitation, and problems of the test and interpretation of the results  

Microsoft Academic Search

This paper aims at the realization of the acceleration method for the small three-phase integral horsepower induction motors as referred to IEEE standard 112-1996. Testing on the small induction motors with an increasing moment of inertia technique is proposed. The characteristic results, the current-speed and torque-speed characteristics, are presented. In addition, verification of the results, limitation, and problems of this

W. Sae-kok; P. Lumyong

2003-01-01

350

Direct torque control of induction machines using space vector modulation  

Microsoft Academic Search

A direct induction machine torque control method based on predictive, deadbeat control of the torque and flux is presented. By estimating the synchronous speed and the voltage behind the transient reactance, the change in torque and flux over the switching period is calculated. The stator voltage required to cause the torque and flux to be equal to their respective reference

Thomas G. Habetler; Francesco Profumo; Michele Pastorelli; Leon M. Tolbert

1992-01-01

351

31. DETAIL OF CONTROLS, ELECTRIC MOTOR, AND LOWER SHEAVES OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

31. DETAIL OF CONTROLS, ELECTRIC MOTOR, AND LOWER SHEAVES OF OTIS PASSENGER ELEVATOR ADDED IN 1921, BASEMENT. The original equipment, shown here, operated on direct current from the Massachusetts Avenue trolley line, abandoned in 1961. - Woodrow Wilson House, 2340 South S Street, Northwest, Washington, District of Columbia, DC

352

Fluid logic control circuit operates nutator actuator motor  

NASA Technical Reports Server (NTRS)

Fluid logic control circuit operates a pneumatic nutator actuator motor. It has no moving parts and consists of connected fluid interaction devices. The operation of this circuit demonstrates the ability of fluid interaction devices to operate in a complex combination of series and parallel logic sequence.

1966-01-01

353

Adaptive Control of Velocity Profile of an Alternating Current Motor  

E-print Network

/velocity control in different electro mechanic configurations are servo and step motors. Tachogenerators three periods ­ acceleration period, slewing at a desired target velocity for some time and deceleration smooth acceleration and deceleration curves with continuous and constrained derivative. For creation

Borissova, Daniela

354

Control of Octopus Arm Extension by a Peripheral Motor Program  

Microsoft Academic Search

For goal-directed arm movements, the nervous system generates a sequence of motor commands that bring the arm toward the target. Control of the octopus arm is especially complex because the arm can be moved in any direction, with a virtually infinite number of degrees of freedom. Here we show that arm extensions can be evoked mechanically or electrically in arms

German Sumbre; Yoram Gutfreund; Graziano Fiorito; Tamar Flash; Binyamin Hochner

2001-01-01

355

Actuator and Kinematic Redundancy in Biological Motor Control*  

E-print Network

Actuator and Kinematic Redundancy in Biological Motor Control* Reza Shadmehr Center for Net-like actuators. Length of each muscle is denoted by ~i' Consider the ball-and-socket joint of Fig. I', where as: 2 Actuator Redundancy One of the fundamental differences between the way one programs robols

Shadmehr, Reza

356

Motor Room, overall view to the west. The control cabinet ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Motor Room, overall view to the west. The control cabinet and cement pipes along the south wall are being temporarily stored in the Pumping Plant and are not part of the original equipment - Wellton-Mohawk Irrigation System, Pumping Plant No. 1, Bounded by Gila River & Union Pacific Railroad, Wellton, Yuma County, AZ

357

Implementation of Intelligent Motor Speed Control Using Rotary Encoder  

Microsoft Academic Search

The project will try to implement the system with the NI Lab view DAQ-6211 capture card to make intelligent motor speed control system, expect this architecture to learn new construction methods, and can develop new applications. Ideas in the hope of a simple feedback information, that is, to determine whether the current speed should be to accelerate or decelerate the

Min Chao; Kunta Hsieh; Chin-Yu Wang; Hsinchiu Chang

2011-01-01

358

Learning Motor Control for Simulated Robot Arms  

Microsoft Academic Search

Abstract Controlling a high degree of freedom humanoid,robot arm to be dextrous and compliant in its movements ,is a critical task in robot ,control. The dynamics ,of such ,flexible and light manipulators have a highly non-linear nature, making analytical closed form solutions using rigid body assumptions inappropriate. In this thesis, we use Locally Weighted Projection Regression to learn online the

Djordje Mitrovic

2006-01-01

359

High reliability motor control for aerospace applications  

Microsoft Academic Search

Weight penalties imposed on commercial and military systems uniquely challenge motion system designers to adhere to compact design rules without compromising robustness and product reliability. Platforms are converting from hydraulic and pneumatic power to electric drives to give system integrators the opportunity to integrate performance and diagnostic monitoring with high speed control algorithms using advanced control ICs. But opportunity comes

Deb K. Bhattacharyya; Jay R. Goetz

2007-01-01

360

Control and Diagnostic Model of Brushless Dc Motor  

NASA Astrophysics Data System (ADS)

A simulation model of brushless DC motor (BLDC) control and diagnostics is considered. The model has been developed using a freeware complex "Modeling in technical devices". Faults and diagnostic parameters of BLDC are analyzed. A logicallinguistic diagnostic model of BLDC has been developed on basis of fuzzy logic. The calculated rules determine dependence of technical condition on diagnostic parameters, their trends and utilized lifetime of BLDC. Experimental results of BLDC technical condition diagnostics are discussed. It is shown that in the course of BLDC degradation the motor condition change depends on diagnostic parameter values

Abramov, Ivan V.; Nikitin, Yury R.; Abramov, Andrei I.; Sosnovich, Ella V.; Boek, Pavol

2014-09-01

361

Control system for a wound-rotor motor  

DOEpatents

A load switching circuit for switching two or more transformer taps under load carrying conditions includes first and second parallel connected bridge rectifier circuits which control the selective connection of a direct current load to taps of a transformer. The first bridge circuit is normally conducting so that the load is connected to a first tap through the first bridge circuit. To transfer the load to the second tap, a switch is operable to connect the second bridge circuit to a second tap, and when the second bridge circuit begins to conduct, the first bridge circuit ceases conduction because the potential at the second tap is higher than the potential at the first tap, and the load is thus connected to the second tap through the second bridge circuit. The load switching circuit is applicable in a motor speed controller for a wound-rotor motor for effecting tap switching as a function of motor speed while providing a stepless motor speed control characteristic.

Ellis, James N. (Chatsworth, CA)

1983-01-01

362

Controlled clockwise and anticlockwise rotational switching of a molecular motor  

NASA Astrophysics Data System (ADS)

The design of artificial molecular machines often takes inspiration from macroscopic machines. However, the parallels between the two systems are often only superficial, because most molecular machines are governed by quantum processes. Previously, rotary molecular motors powered by light and chemical energy have been developed. In electrically driven motors, tunnelling electrons from the tip of a scanning tunnelling microscope have been used to drive the rotation of a simple rotor in a single direction and to move a four-wheeled molecule across a surface. Here, we show that a stand-alone molecular motor adsorbed on a gold surface can be made to rotate in a clockwise or anticlockwise direction by selective inelastic electron tunnelling through different subunits of the motor. Our motor is composed of a tripodal stator for vertical positioning, a five-arm rotor for controlled rotations, and a ruthenium atomic ball bearing connecting the static and rotational parts. The directional rotation arises from sawtooth-like rotational potentials, which are solely determined by the internal molecular structure and are independent of the surface adsorption site.

Perera, U. G. E.; Ample, F.; Kersell, H.; Zhang, Y.; Vives, G.; Echeverria, J.; Grisolia, M.; Rapenne, G.; Joachim, C.; Hla, S.-W.

2013-01-01

363

Controlled clockwise and anticlockwise rotational switching of a molecular motor.  

PubMed

The design of artificial molecular machines often takes inspiration from macroscopic machines. However, the parallels between the two systems are often only superficial, because most molecular machines are governed by quantum processes. Previously, rotary molecular motors powered by light and chemical energy have been developed. In electrically driven motors, tunnelling electrons from the tip of a scanning tunnelling microscope have been used to drive the rotation of a simple rotor in a single direction and to move a four-wheeled molecule across a surface. Here, we show that a stand-alone molecular motor adsorbed on a gold surface can be made to rotate in a clockwise or anticlockwise direction by selective inelastic electron tunnelling through different subunits of the motor. Our motor is composed of a tripodal stator for vertical positioning, a five-arm rotor for controlled rotations, and a ruthenium atomic ball bearing connecting the static and rotational parts. The directional rotation arises from sawtooth-like rotational potentials, which are solely determined by the internal molecular structure and are independent of the surface adsorption site. PMID:23263725

Perera, U G E; Ample, F; Kersell, H; Zhang, Y; Vives, G; Echeverria, J; Grisolia, M; Rapenne, G; Joachim, C; Hla, S-W

2013-01-01

364

Neural network-based model reference adaptive systems for high performance motor drives and motion controls  

Microsoft Academic Search

A number of estimation techniques have been developed to achieve speed or position sensorless motor drives. However, most of these suffer from the variation of motor parameters such as the stator resistance, stator inductance or torque constant. It is known that conventional linear estimators are not adaptive to variations of the operating point. Also, model reference adaptive systems (MRAS) have

Malik Elbuluk; Tong Liu; Iqbal Husain

2000-01-01

365

Propulsion control of superconducting linear synchronous motor vehicle  

SciTech Connect

The armature current of a superconducting Linear Synchronous Motor (LSM) for a maglev vehicle is controlled to produce a suitable propulsion force so that the vehicle follows the reference speed signal sent from a control station. Besides the power is supplied from some inverters to the LSM armature sections where the vehicle exists. This paper shows an exact mathematical modeling of the propulsion control system to treat the system analytically, which is used for designing controllers and performance computer simulations. The calculated results include the simulations when the vehicle goes through power feeder section borders and tunnels that have a large aerodynamic drag force with taking account of an inverter failure.

Sakamoto, Tetsuzo; Shiromizu, Tsunehiro [Kyushu Inst. of Tech., Tobata, Kitakyushu (Japan). Dept. of Control Engineering] [Kyushu Inst. of Tech., Tobata, Kitakyushu (Japan). Dept. of Control Engineering

1997-09-01

366

Novel intelligent PID control of traveling wave ultrasonic motor.  

PubMed

A simple control strategy with acceptable control performance can be a good choice for the mass production of ultrasonic motor control system. In this paper, through the theoretic and experimental analyses of typical control process, a simpler intelligent PID speed control strategy of TWUM is proposed, involving only two expert rules to adjust the PID control parameters based on the current status. Compared with the traditional PID controller, this design requires less calculation and more cheap chips which can be easily involved in online performance. Experiments with different load torques and voltage amplitudes show that the proposed controller can deal with the nonlinearity and load disturbance to maintain good control performance of TWUM. PMID:24957274

Jingzhuo, Shi; Yu, Liu; Jingtao, Huang; Meiyu, Xu; Juwei, Zhang; Lei, Zhang

2014-09-01

367

Self-Tuning Predictive Control of Nonlinear Servo-Motor  

NASA Astrophysics Data System (ADS)

The paper is focused on a design of a self-tuning predictive model control (STMPC) algorithm and its application to a control of a laboratory servo motor. The model predictive control algorithm considers constraints of a manipulated variable. An ARX model is used in the identification part of the self-tuning controller and its parameters are recursively estimated using the recursive least squares method with the directional forgetting. The control algorithm is based on the Generalised Predictive Control (GPC) method and the optimization was realized by minimization of a quadratic and absolute values objective functions. A recursive control algorithm was designed for computation of individual predictions by incorporating a receding horizon principle. Proposed predictive controllers were verified by a real-time control of highly nonlinear laboratory model Amira DR300.

Bobl, Vladimr; Chalupa, Petr; Kubal?k, Marek; Dostl, Petr

2010-11-01

368

Control of a Fuel-Cell Powered DC Electric Vehicle Motor  

E-print Network

Control of a Fuel-Cell Powered DC Electric Vehicle Motor Federico Zenith Sigurd Skogestad of a Fuel-Cell Powered DC Electric Vehicle Motor #12;3 Currently Available Models and Control Strategies Skogestad, Control of a Fuel-Cell Powered DC Electric Vehicle Motor #12;3 Currently Available Models

Skogestad, Sigurd

369

Auxiliary coil controls temperature of RF induction heater  

NASA Technical Reports Server (NTRS)

Auxiliary coil controls the temperature of an RF induction furnace that is powered by a relatively unstable RF generator. Manual or servoed adjustments of the relative position of the auxiliary coil, which is placed in close proximity to the RF coil, changes the looseness of the RF coil and hence the corresponding heating effect of its RF field.

1966-01-01

370

Method for controlling a motor vehicle powertrain  

DOEpatents

A multiple forward speed automatic transmission produces its lowest forward speed ratio when a hydraulic clutch and hydraulic brake are disengaged and a one-way clutch connects a ring gear to the transmission casing. Second forward speed ratio results when the hydraulic clutch is engaged to connect the ring gear to the planetary carrier of a second gear set. Reverse drive and regenerative operation result when an hydraulic brake fixes the planetary and the direction of power flow is reversed. Various sensors produce signals representing the position of the gear selector lever operated manually by the vehicle operator, the speed of the power source, the state of the ignition key, and the rate of release of an accelerator pedal. A control algorithm produces input data representing a commanded upshift, a commanded downshift and a torque command and various constant torque signals. A microprocessor processes the input and produces a response to them in accordance with the execution of a control algorithm. Output or response signals cause selective engagement and disengagement of the clutch and brake to produce the forward drive, reverse and regenerative operation of the transmission. 7 figs.

Burba, J.C.; Landman, R.G.; Patil, P.B.; Reitz, G.A.

1990-05-22

371

Method for controlling a motor vehicle powertrain  

DOEpatents

A multiple forward speed automatic transmission produces its lowest forward speed ratio when a hydraulic clutch and hydraulic brake are disengaged and a one-way clutch connects a ring gear to the transmission casing. Second forward speed ratio results when the hydraulic clutch is engaged to connect the ring gear to the planetary carrier of a second gear set. Reverse drive and regenerative operation result when an hydraulic brake fixes the planetary and the direction of power flow is reversed. Various sensors produce signals representing the position of the gear selector lever operated manually by the vehicle operator, the speed of the power source, the state of the ignition key, and the rate of release of an accelerator pedal. A control algorithm produces input data representing a commanded upshift, a commanded downshift and a torque command and various constant torque signals. A microprocessor processes the input and produces a response to them in accordance with the execution of a control algorithm. Output or response signals cause selective engagement and disengagement of the clutch and brake to produce the forward drive, reverse and regenerative operation of the transmission.

Burba, Joseph C. (Ypsilanti, MI); Landman, Ronald G. (Ypsilanti, MI); Patil, Prabhakar B. (Detroit, MI); Reitz, Graydon A. (Farmington Hills, MI)

1990-01-01

372

A linearly controlled direct-current power source for high-current inductive loads in a magnetic suspension wind tunnel  

NASA Technical Reports Server (NTRS)

The NASA Langley 6 inch magnetic suspension and balance system (MSBS) requires an independently controlled bidirectional DC power source for each of six positioning electromagnets. These electromagnets provide five-degree-of-freedom control over a suspended aerodynamic test model. Existing power equipment, which employs resistance coupled thyratron controlled rectifiers as well as AC to DC motor generator converters, is obsolete, inefficient, and unreliable. A replacement six phase bidirectional controlled bridge rectifier is proposed, which employs power MOSFET switches sequenced by hybrid analog/digital circuits. Full load efficiency is 80 percent compared to 25 percent for the resistance coupled thyratron system. Current feedback provides high control linearity, adjustable current limiting, and current overload protection. A quenching circuit suppresses inductive voltage impulses. It is shown that 20 kHz interference from positioning magnet power into MSBS electromagnetic model position sensors results predominantly from capacitively coupled electric fields. Hence, proper shielding and grounding techniques are necessary. Inductively coupled magnetic interference is negligible.

Tripp, John S.; Daniels, Taumi S.

1990-01-01

373

Closed-loop step motor control using absolute encoders  

SciTech Connect

A multi-axis, step motor control system was developed to accurately position and control the operation of a triple axis spectrometer at the High Flux Isotope Reactor (HFIR) located at Oak Ridge National Laboratory. Triple axis spectrometers are used in neutron scattering and diffraction experiments and require highly accurate positioning. This motion control system can handle up to 16 axes of motion. Four of these axes are outfitted with 17-bit absolute encoders. These four axes are controlled with a software feedback loop that terminates the move based on real-time position information from the absolute encoders. Because the final position of the actuator is used to stop the motion of the step motors, the moves can be made accurately in spite of the large amount of mechanical backlash from a chain drive between the motors and the spectrometer arms. A modified trapezoidal profile, custom C software, and an industrial PC, were used to achieve a positioning accuracy of 0.00275 degrees of rotation. A form of active position maintenance ensures that the angles are maintained with zero error or drift.

Hicks, J.S.; Wright, M.C.

1997-08-01

374

Control Code for Bearingless Switched-Reluctance Motor  

NASA Technical Reports Server (NTRS)

A computer program has been devised for controlling a machine that is an integral combination of magnetic bearings and a switched-reluctance motor. The motor contains an eight-pole stator and a hybrid rotor, which has both (1) a circular lamination stack for levitation and (2) a six-pole lamination stack for rotation. The program computes drive and levitation currents for the stator windings with real-time feedback control. During normal operation, two of the four pairs of opposing stator poles (each pair at right angles to the other pair) levitate the rotor. The remaining two pairs of stator poles exert torque on the six-pole rotor lamination stack to produce rotation. This version is executable in a control-loop time of 40 s on a Pentium (or equivalent) processor that operates at a clock speed of 400 MHz. The program can be expanded, by addition of logic blocks, to enable control of position along additional axes. The code enables adjustment of operational parameters (e.g., motor speed and stiffness, and damping parameters of magnetic bearings) through computer keyboard key presses.

Morrison, Carlos R.

2007-01-01

375

Infrared sensor-based temperature control for domestic induction cooktops.  

PubMed

In this paper, a precise real-time temperature control system based on infrared (IR) thermometry for domestic induction cooking is presented. The temperature in the vessel constitutes the control variable of the closed-loop power control system implemented in a commercial induction cooker. A proportional-integral controller is applied to establish the output power level in order to reach the target temperature. An optical system and a signal conditioning circuit have been implemented. For the signal processing a microprocessor with 12-bit ADC and a sampling rate of 1 Ksps has been used. The analysis of the contributions to the infrared radiation permits the definition of a procedure to estimate the temperature of the vessel with a maximum temperature error of 5 C in the range between 60 and 250 C for a known cookware emissivity. A simple and necessary calibration procedure with a black-body sample is presented. PMID:24638125

Lasobras, Javier; Alonso, Rafael; Carretero, Claudio; Carretero, Enrique; Imaz, Eduardo

2014-01-01

376

Infrared Sensor-Based Temperature Control for Domestic Induction Cooktops  

PubMed Central

In this paper, a precise real-time temperature control system based on infrared (IR) thermometry for domestic induction cooking is presented. The temperature in the vessel constitutes the control variable of the closed-loop power control system implemented in a commercial induction cooker. A proportional-integral controller is applied to establish the output power level in order to reach the target temperature. An optical system and a signal conditioning circuit have been implemented. For the signal processing a microprocessor with 12-bit ADC and a sampling rate of 1 Ksps has been used. The analysis of the contributions to the infrared radiation permits the definition of a procedure to estimate the temperature of the vessel with a maximum temperature error of 5 C in the range between 60 and 250 C for a known cookware emissivity. A simple and necessary calibration procedure with a black-body sample is presented. PMID:24638125

Lasobras, Javier; Alonso, Rafael; Carretero, Claudio; Carretero, Enrique; Imaz, Eduardo

2014-01-01

377

Low speed phaselock speed control system. [for brushless dc motor  

NASA Technical Reports Server (NTRS)

A motor speed control system for an electronically commutated brushless dc motor is provided which includes a phaselock loop with bidirectional torque control for locking the frequency output of a high density encoder, responsive to actual speed conditions, to a reference frequency signal, corresponding to the desired speed. The system includes a phase comparator, which produces an output in accordance with the difference in phase between the reference and encoder frequency signals, and an integrator-digital-to-analog converter unit, which converts the comparator output into an analog error signal voltage. Compensation circuitry, including a biasing means, is provided to convert the analog error signal voltage to a bidirectional error signal voltage which is utilized by an absolute value amplifier, rotational decoder, power amplifier-commutators, and an arrangement of commutation circuitry.

Fulcher, R. W.; Sudey, J. (inventors)

1975-01-01

378

Induction machine  

DOEpatents

A polyphase rotary induction machine for use as a motor or generator utilizing a single rotor assembly having two series connected sets of rotor windings, a first stator winding disposed around the first rotor winding and means for controlling the current induced in one set of the rotor windings compared to the current induced in the other set of the rotor windings. The rotor windings may be wound rotor windings or squirrel cage windings.

Owen, Whitney H. (Ogden, UT)

1980-01-01

379

Effects of muscle atrophy on motor control  

NASA Technical Reports Server (NTRS)

As a biological tissue, muscle adapts to the demands of usage. One traditional way of assessing the extent of this adaptation has been to examine the effects of an altered-activity protocol on the physiological properties of muscles. However, in order to accurately interpret the changes associated with an activity pattern, it is necessary to employ an appropriate control model. A substantial literature exists which reports altered-use effects by comparing experimental observations with those from animals raised in small laboratory cages. Some evidence suggests that small-cage-reared animals actually represent a model of reduced use. For example, laboratory animals subjected to limited physical activity have shown resistance to insulin-induced glucose uptake which can be altered by exercise training. This project concerned itself with the basic mechanisms underlying muscle atrophy. Specifically, the project addressed the issue of the appropriateness of rats raised in conventional-sized cages as experimental models to examine this phenomenon. The project hypothesis was that rats raised in small cages are inappropriate models for the study of muscle atrophy. The experimental protocol involved: 1) raising two populations of rats, one group in conventional (small)-sized cages and the other group in a much larger (133x) cage, from weanling age (21 days) through to young adulthood (125 days); 2) comparison of size- and force-related characteristics of selected test muscles in an acute terminal paradigm.

Stuart, D. G.

1985-01-01

380

Motor and executive control in repetitive timing of brief intervals.  

PubMed

We investigated the causal role of executive control functions in the production of brief time intervals by means of a concurrent task paradigm. To isolate the influence of executive functions on timing from motor coordination effects, we dissociated executive load from the number of effectors used in the dual task situation. In 3 experiments, participants produced isochronous intervals ranging from 524 to 2,000 ms with either the left or the right hand. The concurrent task consisted of the production of either a pseudorandom (high cognitive load) or a simple repeated (low cognitive load) spatial sequence of key presses, while also maintaining a regular temporal sequence. This task was performed with either a single hand (unimanual) or with both hands simultaneously (bimanual). Interference in terms of increased timing variability caused by the concurrent task was observed only in the bimanual condition. We verified that motor coordination in bimanual tasks alone could not account for the interference. Timing interference only appeared when (a) more than 1 effector was involved and (b) there were simultaneous task demands that recruited executive functions. Task interference was not seen if only 1 of these 2 conditions was met. Thus, our results suggest that executive functions are not directly involved in motor timing, but can indirectly affect timing performance when they are required to schedule complex motor coordination. PMID:22731995

Holm, Linus; Ulln, Fredrik; Madison, Guy

2013-04-01

381

Mechanisms of Motor Adaptation in Reactive Balance Control  

PubMed Central

Balance control must be rapidly modified to provide stability in the face of environmental challenges. Although changes in reactive balance over repeated perturbations have been observed previously, only anticipatory postural adjustments preceding voluntary movements have been studied in the framework of motor adaptation and learning theory. Here, we hypothesized that adaptation occurs in task-level balance control during responses to perturbations due to central changes in the control of both anticipatory and reactive components of balance. Our adaptation paradigm consisted of a Training set of forward support-surface perturbations, a Reversal set of novel countermanding perturbations that reversed direction, and a Washout set identical to the Training set. Adaptation was characterized by a change in a motor variable from the beginning to the end of each set, the presence of aftereffects at the beginning of the Washout set when the novel perturbations were removed, and a return of the variable at the end of the Washout to a level comparable to the end of the Training set. Task-level balance performance was characterized by peak center of mass (CoM) excursion and velocity, which showed adaptive changes with repetitive trials. Only small changes in anticipatory postural control, characterized by body lean and background muscle activity were observed. Adaptation was found in the evoked long-latency muscular response, and also in the sensorimotor transformation mediating that response. Finally, in each set, temporal patterns of muscle activity converged towards an optimum predicted by a trade-off between maximizing motor performance and minimizing muscle activity. Our results suggest that adaptation in balance, as well as other motor tasks, is mediated by altering central sensitivity to perturbations and may be driven by energetic considerations. PMID:24810991

Welch, Torrence D. J.; Ting, Lena H.

2014-01-01

382

An investigation on the characteristics of a single-sided linear induction motor at standstill for maglev vehicles  

SciTech Connect

This paper presents the single-sided linear induction motor (SLIM) developed as electrical drives for magnetic levitation vehicle with a cruising speed 40--100Km/h for EXPO`93 in Taejon, Korea. The SLIM is designed to produce a 2,440 Newtons thrust from an active area of 2,836mm long by 235 mm wide at the airgap of 14 mm. In order to investigate its performance characteristics both experimentally and theoretically, the static test facilities was designed and equipped. At standstill, the experimental results are compared with the analytical ones.

Cho, Y. [Dong-A Univ., Pusan (Korea, Republic of). Dept. of Electrical Engineering; Lee, J. [Kyushu Univ., Fukuoka (Japan). Dept. of Electrical Engineering

1997-03-01

383

Induction of motor neurons by Sonic hedgehog is independent of floor plate differentiation  

Microsoft Academic Search

Background: The differentiation of floor plate cells and motor neurons in the vertebrate neural tube appears to be induced by signals from the notochord. The secreted protein encoded by the Sonic hedgehog (Shh) gene is expressed by axial midline cells and can induce floor plate cells in vivo and in vitro. Motor neurons can also be induced in vitro by

Yasuto Tanabe; Henk Roelink; Thomas M. Jessell

1995-01-01

384

DC Servo Motor PID Control in Mobile Robots with Embedded DSP  

Microsoft Academic Search

The research presents a DSP embedded control method for DC servomotor in mobile robots, which controlled DC motor by PID method in embedded DSP. The controller hardware architecture in the research consists of PWM module, encoder module, H-Bridge module, and DSP embedded system module. The DC motor velocity control, position control and current control are work by PID software in

Hongfu Zhou

2008-01-01

385

What is the evidence of impaired motor skills and motor control among children with attention deficit hyperactivity disorder (ADHD)? Systematic review of the literature.  

PubMed

This article presents a review of the studies that have analysed the motor skills of ADHD children without medication and the influence of medication on their motor skills. The following two questions guided the study: What is the evidence of impairment of motor skills and aspects of motor control among children with ADHD aged between 6 and 16 years? What are the effects of ADHD medication on motor skills and motor control? The following keywords were introduced in the main databases: attention disorder and/or ADHD, motor skills and/or handwriting, children, medication. Of the 45 articles retrieved, 30 described motor skills of children with ADHD and 15 articles analysed the influence of ADHD medication on motor skills and motor control. More than half of the children with ADHD have difficulties with gross and fine motor skills. The children with ADHD inattentive subtype seem to present more impairment of fine motor skills, slow reaction time, and online motor control during complex tasks. The proportion of children with ADHD who improved their motor skills to the normal range by using medication varied from 28% to 67% between studies. The children who still show motor deficit while on medication might meet the diagnostic criteria of developmental coordination disorder (DCD). It is important to assess motor skills among children with ADHD because of the risk of reduced participation in activities of daily living that require motor coordination and attention. PMID:25462494

Kaiser, M-L; Schoemaker, M M; Albaret, J-M; Geuze, R H

2014-11-01

386

Induction of plasticity in the human motor cortex by pairing an auditory stimulus with TMS  

PubMed Central

Acoustic stimuli can cause a transient increase in the excitability of the motor cortex. The current study leverages this phenomenon to develop a method for testing the integrity of auditorimotor integration and the capacity for auditorimotor plasticity. We demonstrate that appropriately timed transcranial magnetic stimulation (TMS) of the hand area, paired with auditorily mediated excitation of the motor cortex, induces an enhancement of motor cortex excitability that lasts beyond the time of stimulation. This result demonstrates for the first time that paired associative stimulation (PAS)-induced plasticity within the motor cortex is applicable with auditory stimuli. We propose that the method developed here might provide a useful tool for future studies that measure auditory-motor connectivity in communication disorders. PMID:24917810

Sowman, Paul F.; Dueholm, Sren S.; Rasmussen, Jesper H.; Mrachacz-Kersting, Natalie

2014-01-01

387

Material Science Meets Engineering Education While Building an Induction Pulse Electric Motor  

NSDL National Science Digital Library

This is an excellent design and fabrication project that can be used in introductory engineering classes to teach motor principles as well as material selection. The basic concept of this activity was originally developed by Beakmans World, and I have improved it over the past ten years while teaching motor principles at the university level. Standard Radio Shack materials can be used. One of the most important improvements is replacing the paperclip based motor cradle for one made from copper wire. The primary objective of this project is to gain an understanding of electric motor ; and the materials needed to convert electricity and magnetism into motion. Only a very basic knowledge of electricity and magnetism are needed as a prerequisite. When being utilized as a materials experiment, students can experiment with conductors other than copper (such as aluminum and steel) and detect slower (less efficient) motor operation.

Marshall, John

2009-09-22

388

Brushless DC motor control system responsive to control signals generated by a computer or the like  

NASA Technical Reports Server (NTRS)

A control system for a brushless DC motor responsive to digital control signals is disclosed. The motor includes a multiphase wound stator and a permanent magnet rotor. The motor is arranged so that each phase winding, when energized from a DC source, will drive the rotor through a predetermined angular position or step. A commutation signal generator responsive to the shaft position provides a commutation signal for each winding. A programmable control signal generator such as a computer or microprocessor produces individual digital control signals for each phase winding. The control signals and commutation signals associated with each winding are applied to an AND gate for that phase winding. Each gate controls a switch connected in series with the associated phase winding and the DC source so that each phase winding is energized only when the commutation signal and the control signal associated with that phase winding are present. The motor shaft may be advanced one step at a time to a desired position by applying a predetermined number of control signals in the proper sequence to the AND gates and the torque generated by the motor be regulated by applying a separate control signal and each AND gate which is pulse width modulated to control the total time that each switch connects its associated winding to the DC source during each commutation period.

Packard, D. T. (inventor)

1985-01-01

389

Brushless DC motor control system responsive to control signals generated by a computer or the like  

NASA Astrophysics Data System (ADS)

A control system for a brushless DC motor responsive to digital control signals is disclosed. The motor includes a multiphase wound stator and a permanent magnet rotor. The motor is arranged so that each phase winding, when energized from a DC source, will drive the rotor through a predetermined angular position or step. A commutation signal generator responsive to the shaft position provides a commutation signal for each winding. A programmable control signal generator such as a computer or microprocessor produces individual digital control signals for each phase winding. The control signals and commutation signals associated with each winding are applied to an AND gate for that phase winding. Each gate controls a switch connected in series with the associated phase winding and the DC source so that each phase winding is energized only when the commutation signal and the control signal associated with that phase winding are present. The motor shaft may be advanced one step at a time to a desired position by applying a predetermined number of control signals in the proper sequence to the AND gates and the torque generated by the motor be regulated by applying a separate control signal and each AND gate which is pulse width modulated to control the total time that each switch connects its associated winding to the DC source during each commutation period.

Packard, D. T.

1985-04-01

390

Dual capacity compressor with reversible motor and controls arrangement therefor  

DOEpatents

A hermetic reciprocating compressor such as may be used in heat pump applications is provided for dual capacity operation by providing the crankpin of the crankshaft with an eccentric ring rotatably mounted thereon, and with the end of the connecting rod opposite the piston encompassing the outer circumference of the eccentric ring, with means limiting the rotation of the eccentric ring upon the crankpin between one end point and an opposite angularly displaced end point to provide different values of eccentricity depending upon which end point the eccentric ring is rotated to upon the crankpin, and a reversible motor in the hermetic shell of the compressor for rotating the crankshaft, the motor operating in one direction effecting the angular displacement of the eccentric ring relative to the crankpin to the one end point, and in the opposite direction effecting the angular displacement of the eccentric ring relative to the crankpin to the opposite end point, this arrangement automatically giving different stroke lengths depending upon the direction of motor rotation. The mechanical structure of the arrangement may take various forms including at least one in which any impact of reversal is reduced by utilizing lubricant passages and chambers at the interface area of the crankpin and eccentric ring to provide a dashpot effect. In the main intended application of the arrangement according to the invention, that is, in a refrigerating or air conditioning system, it is desirable to insure a delay during reversal of the direction of compressor operation. A control arrangement is provided in which the control system controls the direction of motor operation in accordance with temperature conditions, the system including control means for effecting operation in a low capacity direction or alternatively in a high capacity direction in response to one set, and another set, respectively, of temperature conditions and with timer means delaying a restart of the compressor motor for at least a predetermined time in response to a condition of the control means operative to initiate a change in the operating direction of the compressor when it restarts.

Sisk, Francis J. (Washington Township, Fayette County, PA)

1980-12-02

391

40 CFR 80.500 - What are the implementation dates for the motor vehicle diesel fuel sulfur control program?  

...the implementation dates for the motor vehicle diesel fuel sulfur control program...REGULATION OF FUELS AND FUEL ADDITIVES Motor Vehicle Diesel Fuel; Nonroad, Locomotive...the implementation dates for the motor vehicle diesel fuel sulfur control...

2014-07-01

392

High-Performance Vector-Controlled AC Motor Drives: Applications and New Technologies  

Microsoft Academic Search

A high-performance ac motor control has been developed by employing the vector control concept. Its versatility has been proven through the six years of experience in applications to pinch roll drives of continuous casting plants, machine tool spindle drives, and other drive systems in industry. Equivalent torque characteristics are achieved with ac motors compared to dc motors without direct detection

Tsuneo Kume; Takanobu Iwakane

1987-01-01

393

Reorganization of the motor cortex is associated with postural control deficits in recurrent low back pain  

Microsoft Academic Search

Many people with recurrent low back pain (LBP) have deficits in postural control of the trunk muscles and this may contribute to the recurrence of pain episodes. However, the neural changes that underlie these motor deficits remain unclear. As the motor cortex contributes to control of postural adjustments, the current study investigated the excitability and organization of the motor cortical

H. Tsao; M. P. Galea; P. W. Hodges

2008-01-01

394

Linear motor drive system for continuous-path closed-loop position control of an object  

DOEpatents

A precision numerical controlled servo-positioning system is provided for continuous closed-loop position control of a machine slide or platform driven by a linear-induction motor. The system utilizes filtered velocity feedback to provide system stability required to operate with a system gain of 100 inches/minute/0.001 inch of following error. The filtered velocity feedback signal is derived from the position output signals of a laser interferometer utilized to monitor the movement of the slide. Air-bearing slides mounted to a stable support are utilized to minimize friction and small irregularities in the slideway which would tend to introduce positioning errors. A microprocessor is programmed to read command and feedback information and converts this information into the system following error signal. This error signal is summed with the negative filtered velocity feedback signal at the input of a servo amplifier whose output serves as the drive power signal to the linear motor position control coil.

Barkman, William E. (Oak Ridge, TN)

1980-01-01

395

Evidence suggesting individual ocular motor control of each eye (muscle).  

PubMed

Current models of the ocular motor system are usually presented in their most reduced form, are unilateral in architecture, and precise yoking is presumed. Although this simplifies the models, it does not accurately simulate the actual neuroanatomy and limits the models to simple, stereotyped responses. Studies of normal humans and monkeys have demonstrated striking disconjugacies in normal responses. Normal saccades may be disconjugate, or 1 eye may exhibit a dynamic overshoot. Asymmetric vergence can result in disconjugate saccades, unequal magnification spectacles cause differential saccadic gain adjustment, and saccades to unequal disparities also cause unequal saccades in the 2 eyes. In strabismus, deviated eyes typically do not mimic the movements of the fixating eye nor do their latent or congenital nystagmus waveforms duplicate those of the fixating eye. In spasmus nutans, each eye oscillates independently of the other. In achiasmatic dogs, uni-ocular saccades and uni-ocular nystagmus waveforms are seen; the same may be true in human achiasma. These data from both normals and those with abnormalities suggest that current models for ocular motor control are inadequate representations of the actual system. The inability of unilateral, yoked control (or even bilateral, yoked control) system models to duplicate the ocular motor responses of binocular mammals suggests that their ocular motor systems evolved from the bilateral, independent control systems seen in chameleons. One need only postulate a yoking overlay superimposed on two independent control systems to achieve conjugacy (bilateral, yoked, independent control) of the eyes. Abnormalities producing grossly disconjugate eye movements may then be simulated using the independent control of each eye released by a deficiency in the yoking overlay. Independent control of each eye coupled with the essential bilateral brain stem architecture implies that each individual muscle is driven by independent populations of neurons (burst cells, neural integrator cells, etc.). The agonist muscles of each eye are usually coordinated (yoked) but may function independently if the task dictates or if binocularity did not develop. Models based on the above architecture would be robust and could duplicate the many responses (both normal and abnormal) possible from the neurophysiological system. PMID:7994479

Dell'Osso, L F

1994-01-01

396

Neuromodulation of lower limb motor control in restorative neurology  

PubMed Central

One consequence of central nervous system injury or disease is the impairment of neural control of movement, resulting in spasticity and paralysis. To enhance recovery, restorative neurology procedures modify altered, yet preserved nervous system function. This review focuses on functional electrical stimulation (FES) and spinal cord stimulation (SCS) that utilize remaining capabilities of the distal apparatus of spinal cord, peripheral nerves and muscles in upper motor neuron dysfunctions. FES for the immediate generation of lower limb movement along with current rehabilitative techniques is reviewed. The potential of SCS for controlling spinal spasticity and enhancing lower limb function in multiple sclerosis and spinal cord injury is discussed. The necessity for precise electrode placement and appropriate stimulation parameter settings to achieve therapeutic specificity is elaborated. This will lead to our human work of epidural and transcutaneous stimulation targeting the lumbar spinal cord for enhancing motor functions in spinal cord injured people, supplemented by pertinent human research of other investigators. We conclude that the concept of restorative neurology recently received new appreciation by accumulated evidence for locomotor circuits residing in the human spinal cord. Technological and clinical advancements need to follow for a major impact on the functional recovery in individuals with severe damage to their motor system. PMID:22464657

Minassian, Karen; Hofstoetter, Ursula; Tansey, Keith; Mayr, Winfried

2012-01-01

397

Voltage Controller Saves Energy, Prolongs Life of Motors  

NASA Technical Reports Server (NTRS)

In 1985, Power Efficiency Corporation of Las Vegas licensed NASA voltage controller technology from Marshall Space Flight Center. In the following years, Power Efficiency made patented improvements to the technology and marketed the resulting products throughout the world as the Performance Controller and the Power Efficiency energy-saving soft start. Soft start gradually introduces power to an electric motor, thus eliminating the harsh, violent mechanical stresses of having the device go from a dormant state to one of full activity; prevents it from running too hot; and increases the motor's lifetime. The product can pay for itself through the reduction in electricity consumed (according to Power Efficiency, within 3 years), depending on the duty cycle of the motor and the prevailing power rates. In many instances, the purchaser is eligible for special utility rebates for the environmental protection it provides. Common applications of Power Efficiency's soft start include mixers, grinders, granulators, conveyors, crushers, stamping presses, injection molders, elevators with MG sets, and escalators. The device has been retrofitted onto equipment at major department store chains, hotels, airports, universities, and for various manufacturers

2007-01-01

398

FUZZY LOGIC MOTOR CONTROL FOR POLLUTION PREVENTION AND IMPROVED ENERGY EFFICIENCY  

EPA Science Inventory

The paper discusses an EPA program investigating fuzzy logic motor control for improved pollution prevention and energy efficiency. nitial computer simulation and laboratory results have demonstrated that fuzzy logic energy optimizers can consistently improve motor operational ef...

399

Justification for Energy Efficient Motors  

E-print Network

. This method is referred to as the Dynamometer, Method "B", in Insti tute of Electrical and Electronic Engi neers Standard 112-1978-IEEE Standard Test Procedure For Polyphase Induction Motors and Generators. The dynamometer method is used for the motor...) Care should be exercised not to damage the stator laminations as this increases losses. (C) The damaged winding should be removed using tempera ture controlled burnout ov ens or mechanical tech niques. Recommendations (1) EE motors should...

Buschart, R. J.

1981-01-01

400

The emulation theory of representation: motor control, imagery, and perception.  

PubMed

The emulation theory of representation is developed and explored as a framework that can revealingly synthesize a wide variety of representational functions of the brain. The framework is based on constructs from control theory (forward models) and signal processing (Kalman filters). The idea is that in addition to simply engaging with the body and environment, the brain constructs neural circuits that act as models of the body and environment. During overt sensorimotor engagement, these models are driven by efference copies in parallel with the body and environment, in order to provide expectations of the sensory feedback, and to enhance and process sensory information. These models can also be run off-line in order to produce imagery, estimate outcomes of different actions, and evaluate and develop motor plans. The framework is initially developed within the context of motor control, where it has been shown that inner models running in parallel with the body can reduce the effects of feedback delay problems. The same mechanisms can account for motor imagery as the off-line driving of the emulator via efference copies. The framework is extended to account for visual imagery as the off-line driving of an emulator of the motor-visual loop. I also show how such systems can provide for amodal spatial imagery. Perception, including visual perception, results from such models being used to form expectations of, and to interpret, sensory input. I close by briefly outlining other cognitive functions that might also be synthesized within this framework, including reasoning, theory of mind phenomena, and language. PMID:15736871

Grush, Rick

2004-06-01

401

A flexible-input, desired-output motor controller for engineering design classes  

Microsoft Academic Search

The flexible-input, desired-output (FIDO) motor controller is a robust wireless motor controller specifically designed for engineering design classes where students design and build radio-controlled devices that are typically featured in an end-of-semester celebration or competition. The controller receives bidirectional control signals from a standard 72-MHz band hobby radio transmitter and proportionally drives four motors with up to 3 A of

Hongshen Ma; Alexander H. Slocum

2006-01-01

402

Comparative analysis of electrical and mechanical fault signatures in induction motors  

E-print Network

of interest. Due to its cost-effective nature and ease of use, electrical sensors are preinstalled at the motor switchgear by manufacturers. However in order to achieve this for mechanical faults, a systematic comparison between the vibration signatures...

Venugopal, Arvind Madabushi

2005-02-17

403

DESIGN OF AUXILIARY PHASE WINDINGS FOR SINGLE-PHASE CAPACITOR FRACTIONAL-HORSEPOWER INDUCTION MOTORS  

Microsoft Academic Search

A method is described for the calculation of the auxiliary-winding parameters of single-phase capacitor motors. The design technique is an extension of that successfully applied to resistance-start motors(1) and is aimed toward assisting the practical design engineer to choose an auxiliary winding which uses the minimum amount of copper while simultaneously satisfying all specificationsThe equations developed do not use the

M. MCCORMICK

1980-01-01

404

Non-dopaminergic treatments for motor control in Parkinson's disease.  

PubMed

The pathological processes underlying Parkinson's disease (PD) involve more than dopamine cell loss within the midbrain. These non-dopaminergic neurotransmitters include noradrenergic, serotonergic, glutamatergic, and cholinergic systems within cortical, brainstem and basal ganglia regions. Several non-dopaminergic treatments are now in clinical use to treat motor symptoms of PD, or are being evaluated as potential therapies. Agents for symptomatic monotherapy and as adjunct to dopaminergic therapies for motor symptoms include adenosine A2A antagonists and the mixed monoamine-B inhibitor (MAO-BI) and glutamate release agent safinamide. The largest area of potential use for non-dopaminergic drugs is as add-on therapy for motor fluctuations. Thus adenosine A2A antagonists, safinamide, and the antiepileptic agent zonisamide can extend the duration of action of levodopa. To reduce levodopa-induced dyskinesia, drugs that target overactive glutamatergic neurotransmission can be used, and include the non-selective N-methyl D-aspartate antagonist amantadine. More recently, selective metabotropic glutamate receptor (mGluR?) antagonists are being evaluated in phase II randomized controlled trials. Serotonergic agents acting as 5-HT2A/2C antagonists, such as the atypical antipsychotic clozapine, may also reduce dyskinesia. 5-HT1A agonists theoretically can reduce dyskinesia, but in practice, may also worsen PD motor symptoms, and so clinical applicability has not yet been shown. Noradrenergic ?2A antagonism using fipamezole can potentially reduce dyskinesia. Several non-dopaminergic agents have also been investigated to reduce non-levodopa-responsive motor symptoms such as gait and tremor. Thus the cholinesterase inhibitor donepezil showed mild benefit in gait, while the predominantly noradrenergic re-uptake inhibitor methylphenidate had conflicting results in advanced PD subjects. Tremor in PD may respond to muscarinic M4 cholinergic antagonists (anticholinergics), but tolerability is often poor. Alternatives include ?-adrenergic antagonists such as propranolol. Other options include 5-HT2A antagonists, and drugs that have mixed binding properties involving serotonin and acetylcholine, such as clozapine and the antidepressant mirtazapine, can be effective in reducing PD tremor. Many other non-dopaminergic agents are in preclinical and phase I/II early stages of study, and the reader is directed to recent reviews. While levodopa remains the most effective agent to treat motor symptoms in PD, the overall approach to using non-dopaminergic drugs in PD is to reduce reliance on levodopa and to target non-levodopa-responsive symptoms. PMID:23917951

Fox, Susan H

2013-09-01

405

Inhibitory motoneurons in arthropod motor control: organisation, function, evolution.  

PubMed

Miniaturisation of somatic cells in animals is limited, for reasons ranging from the accommodation of organelles to surface-to-volume ratio. Consequently, muscle and nerve cells vary in diameters by about two orders of magnitude, in animals covering 12 orders of magnitude in body mass. Small animals thus have to control their behaviour with few muscle fibres and neurons. Hexapod leg muscles, for instance, may consist of a single to a few 100 fibres, and they are controlled by one to, rarely, 19 motoneurons. A typical mammal has thousands of fibres per muscle supplied by hundreds of motoneurons for comparable behavioural performances. Arthopods--crustaceans, hexapods, spiders, and their kin--are on average much smaller than vertebrates, and they possess inhibitory motoneurons for a motor control strategy that allows a broad performance spectrum despite necessarily small cell numbers. This arthropod motor control strategy is reviewed from functional and evolutionary perspectives and its components are described with a focus on inhibitory motoneurons. Inhibitory motoneurons are particularly interesting for a number of reasons: evolutionary and phylogenetic comparison of functional specialisations, evolutionary and developmental origin and diversification, and muscle fibre recruitment strategies. PMID:24965579

Wolf, Harald

2014-08-01

406

Brushless DC motor control system responsive to control signals generated by a computer or the like  

NASA Technical Reports Server (NTRS)

A control system for a brushless DC motor responsive to digital control signals is disclosed. The motor includes a multiphase wound stator and a permanent magnet rotor. The rotor is arranged so that each phase winding, when energized from a DC source, will drive the rotor through a predetermined angular position or step. A commutation signal generator responsive to the shaft position provides a commutation signal for each winding. A programmable control signal generator such as a computer or microprocessor produces individual digital control signals for each phase winding. The control signals and commutation signals associated with each winding are applied to an AND gate for that phase winding. Each gate controls a switch connected in series with the associated phase winding and the DC source so that each phase winding is energized only when the commutation signal and the control signal associated with that phase winding are present. The motor shaft may be advanced one step at a time to a desired position by applying a predetermined number of control signals in the proper sequence to the AND gates and the torque generated by the motor may be regulated by applying a separate control signal to each AND gate which is pulse width modulated to control the total time that each switch connects its associated winding to the DC source during each commutation period.

Packard, Douglas T. (Inventor); Schmitt, Donald E. (Inventor)

1987-01-01

407

A High Performance Direct Torque Control of PMBLDC Motor Using Hybrid (GA Based Fuzzy Logic) Controller  

Microsoft Academic Search

\\u000a This paper deals with the direct torque control of PMBLDC motor using hybrid (Genetic algorithm based fuzzy logic) controller\\u000a to improve the performance of the control scheme. Though the conventional controllers are commonly used in practice, they\\u000a have failed to perform satisfactorily under non linear conditions and parameter variations. In the proposed work, a hybrid\\u000a controller (using genetic algorithm based

E. Kaliappan; C. Sharmeela; A. V. Sayee Krishna

408

A direct-drive motor control system and its features  

Microsoft Academic Search

Although direct-drive motors (DD motors) have been available for some time, the appearance of the DD motors now being used in industrial equipment is a relatively recent phenomenon. As DD motors by their basic principle operate without a reduction gear and transmit their rotational force directly, they eliminate the problems that result from interposition of the reduction gear and have

Yutaka Ono

1991-01-01

409

Influence of Hemianopic Visual Field Loss on Visual Motor Control  

PubMed Central

Background Homonymous hemianopia (HH) is an anisotropic visual impairment characterized by the binocular inability to see one side of the visual field. Patients with HH often misperceive visual space. Here we investigated how HH affects visual motor control. Methods and Findings Seven patients with complete HH and no neglect or cognitive decline and seven gender- and age-matched controls viewed displays in which a target moved randomly along the horizontal or the vertical axis. They used a joystick to control the target movement to keep it at the center of the screen. We found that the mean deviation of the target position from the center of the screen along the horizontal axis was biased toward the blind side for five out of seven HH patients. More importantly, while the normal vision controls showed more precise control and larger response amplitudes when the target moved along the horizontal rather than the vertical axis, the control performance of the HH patients was not different between these two target motion experimental conditions. Conclusions Compared with normal vision controls, HH affected patients' control performance when the target moved horizontally (i.e., along the axis of their visual impairment) rather than vertically. We conclude that hemianopia affects the use of visual information for online control of a moving target specific to the axis of visual impairment. The implications of the findings for driving in hemianopic patients are discussed. PMID:23457594

Niehorster, Diederick C.; Peli, Eli; Haun, Andrew; Li, Li

2013-01-01

410

Scalar control on speed drive for ac motor  

NASA Astrophysics Data System (ADS)

This paper aims to investigate the performance of ABB ACS800 variable speed drive operating under Scalar Control mode, and eventually develop a set of experimental procedures for undergraduate laboratory purposes. Scalar Control is the most widespread form of ac drive, for its low cost and simplicity especially implemented in the open loop mode. Scalar control is achieved by controlling the stator voltage and frequency, thus maintaining the motor's air-gap flux at a constant value. To illustrate the control method, the ac drive is configured according to the wiring diagram in the firmware manual that the drive control location can be both local and external. The drive is selected to operate under Factory application macro, whereby either ordinary speed control applications or constant speeds applications may be used. Under ordinary speed control, frequency reference signals are provided to the drive through the analogue input AI1. The drive will operate at the given frequency reference value throughout the operation regardless of any changes in the load. The torque speed curve moves along the speed axis with no changes to the shape as the supply frequencies changes. On the other hand, the drive allows three preset constant speed through digital inputs DI5 and DI6. The drive operate at a constant speed value over a time period, and only switch from one constant speed to another constant speed by triggering the two input switches. Scalar control is most suitable for applications not required high precision, such as blowers, fans and pumps.

Barsoum, Nader

2012-11-01

411

Plasticity of motor control systems demonstrated by yoga training.  

PubMed

The static motor performance was tested in two groups with 20 subjects in each (age range 17 to 22 years, and 5 females in each group). Tests were carried out at the beginning and end of a 10 day period. The test required being able to insert and hold a metal stylus within holes of varying sizes for 15 sec. Accidental contacts between the stylus and the sides of the holes, were registered on a counter as errors. During the 10 days one group (the yoga group) practised asanas (physical postures), pranayama (voluntary regulation of breathing), meditation, devotional sessions, and tratakas (visual focussing exercises). The control group followed their usual routine. At the end of 10 days the yoga group showed a significant reduction in number of errors (Wilcoxon paired signed ranks test), while the control group did not change. Our earlier study showed a similar improvement in children (9-13 years). It was interesting to note the same degree of plasticity in motor control systems in young adults. The implications for rehabilitation programmes have been discussed. PMID:8063362

Telles, S; Hanumanthaiah, B H; Nagarathna, R; Nagendra, H R

1994-04-01

412

A Neuro-Inspired Spike-Based PID Motor Controller for Multi-Motor Robots with Low Cost FPGAs  

PubMed Central

In this paper we present a neuro-inspired spike-based close-loop controller written in VHDL and implemented for FPGAs. This controller has been focused on controlling a DC motor speed, but only using spikes for information representation, processing and DC motor driving. It could be applied to other motors with proper driver adaptation. This controller architecture represents one of the latest layers in a Spiking Neural Network (SNN), which implements a bridge between robotics actuators and spike-based processing layers and sensors. The presented control system fuses actuation and sensors information as spikes streams, processing these spikes in hard real-time, implementing a massively parallel information processing system, through specialized spike-based circuits. This spike-based close-loop controller has been implemented into an AER platform, designed in our labs, that allows direct control of DC motors: the AER-Robot. Experimental results evidence the viability of the implementation of spike-based controllers, and hardware synthesis denotes low hardware requirements that allow replicating this controller in a high number of parallel controllers working together to allow a real-time robot control. PMID:22666004

Jimenez-Fernandez, Angel; Jimenez-Moreno, Gabriel; Linares-Barranco, Alejandro; Dominguez-Morales, Manuel J.; Paz-Vicente, Rafael; Civit-Balcells, Anton

2012-01-01

413

A neuro-inspired spike-based PID motor controller for multi-motor robots with low cost FPGAs.  

PubMed

In this paper we present a neuro-inspired spike-based close-loop controller written in VHDL and implemented for FPGAs. This controller has been focused on controlling a DC motor speed, but only using spikes for information representation, processing and DC motor driving. It could be applied to other motors with proper driver adaptation. This controller architecture represents one of the latest layers in a Spiking Neural Network (SNN), which implements a bridge between robotics actuators and spike-based processing layers and sensors. The presented control system fuses actuation and sensors information as spikes streams, processing these spikes in hard real-time, implementing a massively parallel information processing system, through specialized spike-based circuits. This spike-based close-loop controller has been implemented into an AER platform, designed in our labs, that allows direct control of DC motors: the AER-Robot. Experimental results evidence the viability of the implementation of spike-based controllers, and hardware synthesis denotes low hardware requirements that allow replicating this controller in a high number of parallel controllers working together to allow a real-time robot control. PMID:22666004

Jimenez-Fernandez, Angel; Jimenez-Moreno, Gabriel; Linares-Barranco, Alejandro; Dominguez-Morales, Manuel J; Paz-Vicente, Rafael; Civit-Balcells, Anton

2012-01-01

414

Optimal Control and Simulation of Brushed Direct-Current Motor Stability Program  

Microsoft Academic Search

In this study, a principal model of a brushed direct-current (DC) motor that has become a benchmark is described. Then it stability program was designed based on linear quadratic optimal control theory and the controllability and observability were studied. Choosing brushed DC motor output angle ? as control variables. Simulation on this control system in Matlab\\/Simulink software environment was described

Chibing Hu; Yazhou Wang

2010-01-01

415

Adaptive CMAC model reference control system for linear piezoelectric ceramic motor  

Microsoft Academic Search

In this study, we present a design method for a model reference control structure using a cerebellar model articulation controller (CMAC). Since the dynamic characteristics and motor parameters of the linear piezoelectric ceramic motor (LPCM) are highly nonlinear and time-varying. An adaptive CMAC model reference control system is proposed to control the position of the moving table of the LPCM

Ya-Fu Peng; Rong-Jong Wain; Chih-Min Lin

2003-01-01

416

Research on Fault Analysis and Fault-Tolerant Control of EV/HEV Powertrain  

E-print Network

, a mechanical transmission and a control unit. Controller Induction motor PWM Inverter Fixed gear Speed powered by an inverter-fed induction motor drive and the usual sensors. The considered failures are mainly with a fault-tolerant 4-leg topology. This topology exploits the induction motor neutral accessibility

Brest, Université de

417

Deficient Grip Force Control in Schizophrenia: Behavioral and Modeling Evidence for Altered Motor Inhibition and Motor Noise  

PubMed Central

Whether upper limb sensorimotor control is affected in schizophrenia and how underlying pathological mechanisms may potentially intervene in these deficits is still being debated. We tested voluntary force control in schizophrenia patients and used a computational model in order to elucidate potential cerebral mechanisms underlying sensorimotor deficits in schizophrenia. A visuomotor grip force-tracking task was performed by 17 medicated and 6 non-medicated patients with schizophrenia (DSM-IV) and by 15 healthy controls. Target forces in the ramp-hold-and-release paradigm were set to 5N and to 10% maximal voluntary grip force. Force trajectory was analyzed by performance measures and Principal Component Analysis (PCA). A computational model incorporating neural control signals was used to replicate the empirically observed motor behavior and to explore underlying neural mechanisms. Grip task performance was significantly lower in medicated and non-medicated schizophrenia patients compared to controls. Three behavioral variables were significantly higher in both patient groups: tracking error (by 50%), coefficient of variation of force (by 57%) and duration of force release (up by 37%). Behavioral performance did not differ between patient groups. Computational simulation successfully replicated these findings and predicted that decreased motor inhibition, together with an increased signal-dependent motor noise, are sufficient to explain the observed motor deficits in patients. PCA also suggested altered motor inhibition as a key factor differentiating patients from control subjects: the principal component representing inhibition correlated with clinical severity. These findings show that schizophrenia affects voluntary sensorimotor control of the hand independent of medication, and suggest that reduced motor inhibition and increased signal-dependent motor noise likely reflect key pathological mechanisms of the sensorimotor deficit. PMID:25369465

Teremetz, Maxime; Amado, Isabelle; Bendjemaa, Narjes; Krebs, Marie-Odile; Lindberg, Pavel G.; Maier, Marc A.

2014-01-01

418

Digital signal processing control of induction machine`s torque and stator flux utilizing the direct stator flux field orientation method  

SciTech Connect

This paper presents a review of the Direct Stator Flux Field Orientation control method. This method can be used to control an induction motor`s torque and flux directly and is the application of interest for this thesis. This control method is implemented without the traditional feedback loops and associated hardware. Predictions are made, by mathematical calculations, of the stator voltage vector. The voltage vector is determined twice a switching period. The switching period is fixed throughout the analysis. The three phase inverter duty cycle necessary to control the torque and flux of the induction machine is determined by the voltage space vector Pulse Width Modulation (PWM) technique. Transient performance of either the flux or torque requires an alternate modulation scheme which is also addressed in this thesis. A block diagram of this closed loop system is provided. 22 figs., 7 tabs.

Seiz, J.B.

1997-04-01

419

MAGNETIC COUPLING BETWEEN DC TACHOMETER AND MOTOR AND ITS EFFECT ON MOTION CONTROL  

E-print Network

DC motor-tachometer unit, is assembled. A voltage-to-current PWM servo amplifier is employedMAGNETIC COUPLING BETWEEN DC TACHOMETER AND MOTOR AND ITS EFFECT ON MOTION CONTROL Shorya Awtar that takes into account the effect of magnetic coupling in a DC motor-tachometer assembly. Magnetic coupling

Awtar, Shorya

420

EKSENEL AKILI MOTORLARDA UYGULANAN KONTROL YNTEMLERNEL?? KN BRNCELEME AN OVERVEW CONTROL METHOD OF AXAL FLUX MOTORS  

Microsoft Academic Search

Axial flux motors have become important issue on the electric machines. They have several unique features such as high efficiency, high power and torque densities. Hence they are used in the Electrical Vehicles The paper are investigated the axial flux motor structures, control systems and prototype of axial flux motors that is having investigated. In this way the paper aim

Engin HNER

421

Modular features of motor control and learning Ferdinando A. Mussa-Ivaldi  

E-print Network

Modular features of motor control and learning Ferdinando A. Mussa-Ivaldi Address Department The focus on complex motor behaviors has highlighted the role of modular representations in the planning this complex yet ordinary motor competence may be represented and implemented in robots is of great value

422

Position Control for Ultrasonic Motors Using Backstepping Control and Dead-Zone Compensation with Fuzzy Inference  

NASA Astrophysics Data System (ADS)

The ultrasonic motor has a heavy nonlinearity, which varies with driving conditions and possesses variable dead-zone in the control input associated with applied load torque. The dead-zone is a problem as an accurate positioning actuator for industrial applications and it is important to eliminate the dead-zone in order to improve the control performance. This paper proposes a new position control scheme of ultrasonic motors to overcome dead-zone employing model reference adaptive control (MRAC) with fuzzy inference. The dead-zone is compensated by fuzzy inference, and backstepping control performs accurate position control. As compared with MRAC which uses an augmented error, backstepping control can analyze a transient response. Mathematical models are formulated and experimental results are given to validate the proposed position control scheme.

Senjyu, Tomonobu; Yoshida, Tomohiro; Uezato, Katsumi; Funabashi, Toshihisa

423

VLSI design approach of complex motor control: case of direct torque control of AC machine  

Microsoft Academic Search

This paper presents VLSI design for complex motor control in the case of direct torque control (DTC) algorithm. A specific methodology, using VHDL descriptions and analog-digital simulations in a power and analog context, is applied to study DTC algorithm digital properties, ASIC architecture and VLSI layout

F. Aubepart; Philippe POURE; F. Braun

2000-01-01

424

AC induction servo sizing for motion control applications via loss minimizing real-time flux control  

Microsoft Academic Search

A design procedure for induction machine servo motion control applications that can be used to optimally select the minimum size machine and\\/or to obtain optimal time performance from a given machine is presented. The basis of the technique is in modeling and controlling of machine losses. In motion control servo applications, the position and velocity trajectories are often specified. For

Robert D. Lorenz; Sheng-Ming Yang

1992-01-01

425

Time gain influences adaptive visual-motor isometric force control.  

PubMed

This study examined the influence of time gain on the visual-motor control of isometric force. Time gain denotes the spatial length on the computer screen representing the unit of elapsed time of the force output, through which the time properties of the visually perceived force output can be compressed or extended. Five time gains and three force target waveforms (sinewave, brown noise, and straight line) with different time-dependent properties were tested in the experiment. The results revealed that time gain influenced task performance nonlinearly in a way that was dependent on the predictability of the target waveforms. In the sinewave target condition, there was a U-shaped modulation of time gain on the mean and variability of force error, and an inverted U-shaped modulation on the time-dependent structure of force variability. The time gain modulation effect was weaker in the brown noise target condition and absent in the constant force target condition. The results extend the effect of visual information gain regulation from force gain to time gain. The interaction between the time gain and target waveform supports the general proposition that the control of motor output is influenced by the interaction of different categories of constraints where the influence of visual information is dependent on the temporal properties and predictability of the force output and the task requirement. PMID:22278109

Hu, Xiaogang; Mazich, Molly M; Newell, Karl M

2012-04-01

426

Mechanical fault detection in induction motor drives through stator current monitoring -Theory  

E-print Network

of electrical systems. Popular examples include systems in aircraft, electric railway traction, power plant, the motor is no more directly connected to the power grid but supplied by an inverter. The in- verter) Engelmann & Middendorf (1995). Similar results were obtained in an EPRI (Electric Power Research Institute

Paris-Sud XI, Université de

427

Support vector machine based decision for mechanical fault condition monitoring in induction motor using an advanced Hilbert-Park transform.  

PubMed

In this work we suggest an original fault signature based on an improved combination of Hilbert and Park transforms. Starting from this combination we can create two fault signatures: Hilbert modulus current space vector (HMCSV) and Hilbert phase current space vector (HPCSV). These two fault signatures are subsequently analysed using the classical fast Fourier transform (FFT). The effects of mechanical faults on the HMCSV and HPCSV spectrums are described, and the related frequencies are determined. The magnitudes of spectral components, relative to the studied faults (air-gap eccentricity and outer raceway ball bearing defect), are extracted in order to develop the input vector necessary for learning and testing the support vector machine with an aim of classifying automatically the various states of the induction motor. PMID:22742760

Ben Salem, Samira; Bacha, Khmais; Chaari, Abdelkader

2012-09-01

428

A robotic model to investigate human motor control.  

PubMed

The role of the mechanical properties of the neuromuscular system in motor control has been investigated for a long time in both human and animal subjects, mainly through the application of mechanical perturbations to the limb during natural movements and the observation of its corrective responses. These methods have provided a wealth of insight into how the central nervous system controls the limb. They suffer, however, from the fact that it is almost impossible to separate the active and passive components of the measured arm stiffness and that the measurement may themselves alter the stiffness characteristic of the arm. As a complement to these analyses, the implementation of a given neuroscientific hypothesis on a real mechanical system could overcome these measurement artifact and provide a tool that is, under full control of the experimenter, able to replicate the relevant functional features of the human arm. In this article, we introduce the NEURARM platform, a robotic arm intended to test hypotheses on the human motor control system. As such, NEURARM satisfies two key requirements. First, its kinematic parameters and inertia are similar to that of the human arm. Second, NEURARM mimics the main physical features of the human actuation system, specifically, the use of tendons to transfer force, the presence of antagonistic muscle pairs, the passive elasticity of muscles in the absence of any neural feedback and the non-linear elastic behaviour. This article presents the design and characterization of the NEURARM actuation system. The resulting mechanical behaviour, which has been tested in joint and Cartesian space under static and dynamic conditions, proves that the NEURARM platform can be exploited as a robotic model of the human arm, and could thus represent a powerful tool for neuroscience investigations. PMID:21769741

Lenzi, Tommaso; Vitiello, Nicola; McIntyre, Joseph; Roccella, Stefano; Carrozza, Maria Chiara

2011-07-01

429

Vehicle Yaw Control Utilizing Hybrid Electric Drivetrains with Multiple Electric Motors.  

E-print Network

??Vehicles with multiple electric motors coupled to individual wheels have excitingopportunities for safety control systems. An investigation is conducted to determine whatdynamic benefits can be (more)

D'Iorio, James

2008-01-01

430

Index Terms Motion Control, Linear Motor, Adaptive Robust  

E-print Network

Abstract This paper studies the precision motion control of high-speed/acceleration linear motors in a commercial gantry which are subject to significant nonlinear cogging forces. A discontinuous projection based desired compensation adaptive robust controller (ARC) is constructed and implemented. Design models consisting of known basis functions with unknown weights are used to approximate various unknown nonlinear forces with model approximation errors being explicitly accounted for in the controller design process. On-line parameter adaptation is then utilized to reduce the effect of various parametric uncertainties while certain robust control laws are synthesized to effectively handle various modeling uncertainties for a guaranteed robust performance. Comparative experimental results obtained on an Anorad commercial gantry with a linear encoder resolution of 0.5 m and a position measurement resolution of 20 nanometers by external laser interferometers are presented to illustrate the achievable control performance of the proposed control strategy in implementation. Experiments are also performed to explicitly identify the cogging forces via external force sensors. Various comparative experimental results with and without the proposed cogging force compensations are then obtained to validate the effectiveness of the approach in practical applications.

Qingfeng Wang

431

Analysis of a concentrated winding induction machine for adjustable speed drive applications. I. Motor analysis  

Microsoft Academic Search

The performance of multiphase machines designed for operation with static power converters is investigated. The winding distributions are intentionally rectangular to better accommodate the rectangular waveforms of solid-state inverters. Equations which define the transient as well as steady-state behavior, including the computation of all machine inductances, are derived. In deriving these equations the space harmonics are specifically included. Equations for

Hamid A. Toliyat; T.A. Lipo; J. C. White

1991-01-01

432

A time-stepping coupled finite element-state space model for induction motor drives. II. Machine performance computation and verification  

Microsoft Academic Search

In a companion paper, a time-stepping coupled finite element state-space algorithm for the modeling of induction motor drives was developed. The model formulation and algorithm allows one to rigorously model the effects of space harmonics caused by magnetic circuit nonlinearities, topology and winding layouts, as well as their interaction with time harmonics caused by the inverter operation. In this paper,

J. F. Bangura; F. N. Isaac; N. A. Demerdash; A. A. Arkadan

1997-01-01

433

A novel double-circuit-rotor balanced induction motor for improved slip-energy recovery drive performance. I. Modeling and simulation  

Microsoft Academic Search

A new construction for the rotor windings of balanced wound-rotor induction motors employed in the slip energy recovery drives is proposed, in this paper, to reduce the time harmonics which are commonly generated in the machine. The proposed machine has a double-circuit in the rotor. One circuit is star connected while the other is delta connected. Each of these two

W. S. Zaltaria; S. R. Alwash; A. A. Shaltout

1996-01-01

434

Analysis of airgap flux, current, and vibration signals as a function of the combination of static and dynamic airgap eccentricity in 3-phase induction motors  

Microsoft Academic Search

This paper provides new information for the online diagnosis of airgap eccentricity in 3-phase induction motors. A new theoretical analysis of the interaction between harmonic field components due to static and dynamic rotor eccentricity which previous research has not considered is put forward, The resultant nonsupply-frequency current components produced in the supply current which are highlighted by the analysis are

D. G. Dorrell; W. T. Thomson; S. Roach

1997-01-01

435

Motor planning modulates sensory-motor control of collision avoidance behavior in the bullfrog, Rana catesbeiana  

PubMed Central

Summary In this study, we examined the collision avoidance behavior of the frog, Rana catesbeiana to an approaching object in the upper visual field. The angular velocity of the frog's escape turn showed a significant positive correlation with the turn angle (r2?=?0.5741, P<0.05). A similar mechanism of velocity control has been known in head movements of the owl and in human saccades. By analogy, this suggests that the frog planned its escape velocity in advance of executing the turn, to make the duration of the escape behavior relatively constant. For escape turns less than 60, the positive correlation was very strong (r2?=?0.7097, P<0.05). Thus, the frog controlled the angular velocity of small escape turns very accurately and completed the behavior within a constant time. On the other hand, for escape turns greater than 60, the same correlation was not significant (r2?=?0.065, P>0.05). Thus, the frog was not able to control the velocity of the large escape turns accurately and did not complete the behavior within a constant time. In the latter case, there was a small but significant positive correlation between the threshold angular size and the angular velocity (r2?=?0.1459, P<0.05). This suggests that the threshold is controlled to compensate for the insufficient escape velocity achieved during large turn angles, and could explain a significant negative correlation between the turn angle and the threshold angular size (r2?=?0.1145, P<0.05). Thus, it is likely that the threshold angular size is also controlled by the turn angle and is modulated by motor planning. PMID:23213389

Nakagawa, Hideki; Nishida, Yuuya

2012-01-01

436

A gain scheduled controller for sinusoidal ripple elimination of AC PM motor systems  

Microsoft Academic Search

An adaptive control algorithm for the elimination of torque and velocity ripples in the alternating current (AC) permanent magnet (PM) motor control systems is presented in this paper. A model of AC PM motor system includes n sinusoidal disturbances is first developed. The internal model principle (IMP) is then applied to design a controller to eliminate the torque and velocity

J. Wang; L. Qiu

2007-01-01

437

Discrete time output feedback sliding mode control for nonlinear MIMO system: a stepper motor case  

Microsoft Academic Search

This article, presents discrete sliding mode control algorithm using multirate output feedback for control of stepper motor. The algorithm developed by the authors uses past output samples and past control inputs. When all the states of the system are neither physical variable nor available for measurement, multirate output feedback can be used. The stepper motor is known to be a

Bijnan Bandyopadhyay; Vishvjit Kashyapray Thakar

2008-01-01

438

Microprocessor-Controlled DC Motor for Load-Insensitive Position Servo System  

Microsoft Academic Search

The conventional proportional P controller has been often used as the position controller of the dc servo motor. When the unknown and inaccessible load torque, such as the coulomb friction, the gravity, and so on, is imposed on the dc servo motor, this control system has the steady-and\\/or transient-state error.

Kiyoshi Ohishi; Masato Nakao; Kouhei Ohnishi; Kunio Miyachi

1987-01-01

439

Regulation of parkinsonian motor behaviours by optogenetic control of basal ganglia circuitry  

E-print Network

LETTERS Regulation of parkinsonian motor behaviours by optogenetic control of basal ganglia of basal ganglia circuitry in vivo, using optogenetic control11­14 of direct- and indirect-pathway medium motor deficits. To obtain selective optogenetic control of the direct and indirect pathways in vivo, we

Schnitzer, Mark

440

Solid state circuit controls direction, speed, and braking of dc motor  

NASA Technical Reports Server (NTRS)

Full-wave bridge rectifier circuit controls the direction, speed, and braking of a dc motor. Gating in the circuit of Silicon Controlled Rectifiers /SCRS/ controls output polarity and braking is provided by an SCR that is gated to short circuit the reverse voltage generated by reversal of motor rotation.

Hanna, M. F.

1966-01-01

441

Induction plasma calcining of pigment particles for thermal control coatings  

NASA Technical Reports Server (NTRS)

Induction plasma heating techniques were studied for calcining zinc orthotitanate particles for use in thermal control coatings. Previous studies indicated that the optimum calcining temperature is between 1400 and 1750 C. An intermediate temperature (1670 C) was chosen as a reference point for running a temperature series at the reference point and 220 C on both sides. The effect of varying chamber temperature on the reflectance spectra, before and after vacuum UV irradiation, is presented. The correlation between Zn2Ti04 paramagnetic resonance activity and its susceptibility to vacuum UV damage is discussed.

Farley, E. P.

1971-01-01

442

Space motion sickness: The sensory motor controls and cardiovascular correlation  

NASA Astrophysics Data System (ADS)

Background and PurposeSpace motion sickness (SMS) and related symptoms remain a major limiting factor in Space operations. A recent comprehensive literature review [J.R. Lackner, Z. DiZio, Space motion sickness, Experimental Brain Research 175 (2006) 377-399, doi 10.1007/s00221-006-0697-y] concluded that SMS does not represent a unique diagnostic entity, and there is no adequate predictor of SMS' susceptibility and severity. No countermeasure has been found reliable to prevent or treat SMS symptoms onset. Recent neurophysiological findings on sensory-motor controls monitoring [P.A. Souvestre, C. Landrock, Biomedical-performance monitoring and assessment of astronauts by means of an ocular vestibular monitoring system, Acta Astronautica, 60 (4-7) (2007) 313-321, doi:10.1016/j.actaastro.2006.08.013] and heart-rate variability (HRV) measurements relationship could explain post-flight orthostatic intolerance (PFOI) in astronauts [A.P. Blaber, R.L. Bondar, M.S. Kassam, Heart rate variability and short duration space flight: relationship to post-flight orthostatic intolerance, BMC Physiology 4 (2004) 6]. These two methodologies are generally overlooked in SMS' analysis. In this paper we present the case for a strong relationship between sensory-motor controls related symptoms, including orthostatic intolerance (OI) and SMS symptoms. MethodsThis paper expands on several previously published papers [J.R. Lackner, Z. DiZio, Space motion sickness, Experimental Brain Research 175 (2006) 377-399, doi 10.1007/s00221-006-0697-y; P.A. Souvestre, C. Landrock, Biomedical-performance monitoring and assessment of astronauts by means of an ocular vestibular monitoring system, Acta Astronautica, 60 (4-7) (2007) 313-321, doi:10.1016/j.actaastro.2006.08.013] along with an updated literature review. An analysis of a 10-year period clinical data from trauma patients experiencing postural deficiency syndrome (PDS) show assessment and monitoring techniques which successfully identify trauma impacts on core regulatory sensory motor and cognitive mechanisms. Static postural analysis provides specific central neurophysiological markers that can reliably identify PDS occurrence among classic peripheral musculoskeletal and spinal data [C. Landrock, P.A. Souvestre, Static postural analysis: a methodology to assess gravity related sensory motor controls' status for astronauts, 2006-01-2298, 36th SAE-ICES]. Many astronauts experience PFOI and recent research has implicated altered autonomic cardiovascular regulation caused by microgravity. HRV measurements have been used to determine if some pre-flight autonomic indicators relating to PFOI may exist by differentiating parasympathetic and sympathetic activity. ResultsThis review suggests a new approach to SMS mitigation based on specific neurophysiological assessment criteria. While SMS may not be a "unique diagnosis", it should be treated as result, or symptom of, the condition space adaptation syndrome (SAS), which can be shown to be a unique diagnosis. This methodology can identify and measure brain functional status in specific areas during pre-flight and post-flight examinations. This could provide further understanding on why, how and when SMS and PFOI might occur in Astronauts, and lead to criteria that predict susceptibility to SMS. An additional test component is presented that relates to using static central sensory-motor data towards understanding SMS and OI occurrence. Recent investigations indicate relationship between HRV autonomic indicators with Motion Sickness [B. Cheung, K. Hoffer, R. Heskin, A. Smith, Physiological and behavioral responses to an exposure to pitch illusion in the simulator, Aviation Space, 2004; Y. Yokota, M. Aoki, K. Mizuta, Y. Ito, N. Isu, Motion sickness susceptibility associated with visually induced postural instability and cardiac autonomic responses in healthy subjects, Acta Oto-laryngological, 2005]. It is found that astronauts with lower sympatho-vagal balance and higher supine parasympathetic activity pre-flight may present with PFOI indicators. Not on

Souvestre, Philippe A.; Blaber, Andrew P.; Landrock, Clinton K.

443

Interaction of attentional and motor control processes in handwriting.  

PubMed

The interaction between attentional capacity, motor control processes, and strategic adaptations to changing task demands was investigated in handwriting, a continuous (rather than discrete) skilled performance. Twenty-four subjects completed 12 two-minute handwriting samples under instructions stressing speeded handwriting, normal handwriting, or highly legible handwriting. For half of the writing samples, a concurrent auditory monitoring task was imposed. Subjects copied either familiar (English) or unfamiliar (Latin) passages. Writing speed, legibility ratings, errors in writing and in the secondary auditory task, and a derived measure of the average number of characters held in short-term memory during each sample ("planning unit size") were the dependent variables. The results indicated that the ability to adapt to instructions stressing speed or legibility was substantially constrained by the concurrent listening task and by text familiarity. Interactions between instructions, task concurrence, and text familiarity in the legibility ratings, combined with further analyses of planning unit size, indicated that information throughput from temporary storage mechanisms to motor processes mediated the loss of flexibility effect. Overall, the results suggest that strategic adaptations of a skilled performance to changing task circumstances are sensitive to concurrent attentional demands and that departures from "normal" or "modal" performance require attention. PMID:2275486

Brown, T L; Donnenwirth, E E

1990-01-01

444

Pharmacological induction of heat-shock proteins alleviates polyglutamine-mediated motor neuron disease  

Microsoft Academic Search

Spinal and bulbar muscular atrophy (SBMA) is an adult-onset motor neuron disease caused by the expansion of a trinucleotide CAG repeat encoding the polyglutamine tract in the first exon of the androgen receptor gene (AR). The pathogenic, polyglutamine-expanded AR protein accumulates in the cell nucleus in a ligand-dependent manner and inhibits transcription by interfering with transcriptional factors and coactivators. Heat-shock

Masahisa Katsuno; Chen Sang; Hiroaki Adachi; Makoto Minamiyama; Masahiro Waza; Fumiaki Tanaka; Manabu Doyu; Gen Sobue

2005-01-01

445

Steady-State Analysis of the Series Resistance-Inductance Circuit Controlled by Silicon Controlled Rectifiers  

Microsoft Academic Search

The series resistance-inductance circuit controlled by triggering of a silicon-controlled rectifier pair results in load voltage and current of different nonsinusoidal waveforms. Rigorous analysis of the harmonic voltages and currents results in calculated values agreeing very closely with measurements. The effective power factor is found to remain almost constant at the sinusoidal value. Fundamental load power can be accurately measured

William Shepherd

1965-01-01

446

Disturbance-free operation of a multiphase current-regulated motor drive with an opened phase  

Microsoft Academic Search

Although design of induction motor drives employing field oriented control has reached a relatively mature state, relatively little effort has been directed toward improving the reliability of these drives. In this paper, a new, improved induction motor control strategy is proposed incorporating a multiphase machine that allows for continuous, disturbance-free operation of the drive even with complete loss of one

Jen-Ren Fu; Thomas A. Lipo

1994-01-01

447

Control aspects of motor neural prosthesis: sensory interface.  

PubMed

A neural prosthesis (NP) has two applications: permanent assistance of function, and temporary assistance that contributes to long-term recovery of function. Here, we address control issues for a therapeutic NP which uses surface electrodes. We suggest that the effective NP for therapy needs to implement rule-based control. Rule-based control relies on the triggering of preprogrammed sequences of electrical stimulation by the sensory signals. The sensory system in the therapeutic NP needs to be simple for installation, allow self-calibration, it must be robust, and sufficiently redundant in order to guarantee safe operation. The sensory signals need to generate control signals; hence, sensory fusion is needed. MEMS technology today provides sensors that fulfill the technical requirements (accelerometers, gyroscopes, force sensing resistors). Therefore, the task was to design a sensory signal processing method from the mentioned solid state sensors that would recognize phases during the gait cycle. This is necessary for the control of multi channel electrical stimulation. The sensory fusion consists of the following two phases: 1) estimation of vertical and horizontal components of the ground reaction force, center of pressure, and joint angles from the solid-state sensors, and 2) fusion of the estimated signals into a sequence of command signals. The first phase was realized by the use of artificial neural networks and adaptive neuro-fuzzy inference systems, while the second by the use of inductive learning described in our earlier work [1]. PMID:18002969

Popovi?, Dejan B; Dosen, Strahinja; Popovi?, Mirjana B; Stefanovi?, Filip; Kojovi?, Jovana

2007-01-01

448

From intention to action: motor cortex and the control of reaching movements.  

PubMed

The motor cortex was experimentally identified more than a century ago using surface electrical stimulation and lesions. Those first studies initiated a debate about the role of the motor cortex in the control of voluntary movement that continues to this day. The main issue concerns the degree to which the descending motor command emanating from the motor cortex specifies the spatiotemporal form of a movement or its causal forces, torques and muscle activity. The neurophysiological evidence supports both perspectives. This chapter surveys some of that evidence, with particular focus on the latter, more 'traditional', role of motor cortex. PMID:19227499

Kalaska, John F

2009-01-01

449

Simplified modeling and generalized predictive position control of an ultrasonic motor.  

PubMed

Ultrasonic motors (USM's) possess heavy nonlinear and load dependent characteristics such as dead-zone and saturation reverse effects, which vary with driving conditions. In this paper, behavior of an ultrasonic motor is modeled using Hammerstein model structure and experimental measurements. Also, model predictive controllers are designed to obtain precise USM position control. Simulation results indicate improved performance of the motor for both set point tracking and disturbance rejection. PMID:15868864

Bigdeli, Nooshin; Haeri, Mohammad

2005-04-01

450

Central motor control failure in fibromyalgia: a surface electromyography study  

PubMed Central

Background Fibromyalgia (FM) is characterised by diffuse musculoskeletal pain and stiffness at multiple sites, tender points in characteristic locations, and the frequent presence of symptoms such as fatigue. The aim of this study was to assess whether the myoelectrical manifestations of fatigue in patients affected by FM are central or peripheral in origin. Methods Eight female patients aged 55.6 13.6 years (FM group) and eight healthy female volunteers aged 50.3 9.3 years (MCG) were studied by means of non-invasive surface electromyography (s-EMG) involving a linear array of 16 electrodes placed on the skin overlying the biceps brachii muscle, with muscle fatigue being evoked by means of voluntary and involuntary (electrically elicited) contractions. Maximal voluntary contractions (MVCs), motor unit action potential conduction velocity distributions (mean SD and skewness), and the mean power frequency of the spectrum (MNF) were estimated in order to assess whether there were any significant differences between the two groups and contraction types. Results The motor pattern of recruitment during voluntary contractions was altered in the FM patients, who also showed fewer myoelectrical manifestations of fatigue (normalised conduction velocity rate of changes: -0.074 0.052%/s in FM vs -0.196 0.133%/s in MCG; normalised MNF rate of changes: -0.29 0.16%/s in FM vs -0.66 0.34%/s in MCG). Mean conduction velocity distribution and skewnesses values were higher (p < 0.01) in the FM group. There were no between-group differences in the results obtained from the electrically elicited contractions. Conclusion The apparent paradox of fewer myoelectrical manifestations of fatigue in FM is the electrophysiological expression of muscle remodelling in terms of the prevalence of slow conducting fatigue-resistant type I fibres. As the only between-group differences concerned voluntary contractions, they are probably more related to central motor control failure than muscle membrane alterations, which suggests pathological muscle fibre remodelling related to altered suprasegmental control. PMID:19570214

Casale, Roberto; Sarzi-Puttini, Piercarlo; Atzeni, Fabiola; Gazzoni, Marco; Buskila, Dan; Rainoldi, Alberto

2009-01-01

451

Fine Motor Control Is Related to Cognitive Control in Adolescents with Down Syndrome  

ERIC Educational Resources Information Center

The connection between human cognitive development and motor functioning has been systematically examined in many typical and atypical populations; however, only a few studies focus on people with Down syndrome (DS). Twelve adolescents with DS participated and their cognitive control, measured by the Corsi-Block tapping test (e.g., visual working

Chen, Chih-Chia; Ringenbach, Shannon D. R.; Albert, Andrew; Semken, Keith

2014-01-01

452

ELECTRICAL AND ELECTRONIC INDUSTRIAL CONTROL. D-C MAGNETIC MOTOR CONTROL, UNIT 7, INSTRUCTOR'S GUIDE.  

ERIC Educational Resources Information Center

THIS GUIDE IS FOR TEACHER USE IN DIRECTING INDIVIDUAL STUDY OF DIRECT CURRENT MAGNETIC MOTOR CONTROL IN ELECTRICAL-ELECTRONIC PROGRAMS. IT WAS DEVELOPED BY AN INSTRUCTIONAL MATERIALS SPECIALIST AND ADVISERS. EACH OF THE 15 INSTRUCTOR'S SHEETS GIVES THE LESSON SUBJECT, PURPOSE, INTRODUCTORY INFORMATION, REFERENCES, AND STEP-BY-STEP SOLUTIONS OF THE

SUTTON, MACK C.

453

ELECTRICAL AND ELECTRONIC INDUSTRIAL CONTROL. D-C MAGNETIC MOTOR CONTROL, UNIT 7, ASSIGNMENTS.  

ERIC Educational Resources Information Center

THIS GUIDE IS FOR INDIVIDUAL STUDENT USE IN STUDYING DIRECT CURRENT MAGNETIC MOTOR CONTROL IN ELECTRICAL-ELECTRONIC PROGRAMS. IT WAS DEVELOPED BY AN INSTRUCTIONAL MATERIALS SPECIALIST AND ADVISERS. EACH OF THE 15 ASSIGNMENT SHEETS PROVIDES THE LESSON SUBJECT, PURPOSE, INTRODUCTORY INFORMATION, STUDY REFERENCES, AND PROBLEMS. SOME OF THE LESSONS

SUTTON, MACK C.

454

Quasi-optimal decentralized astatic automatic control system for asynchronous motor velocity control based on Lyapunov vector functions procedure  

Microsoft Academic Search

A procedure permitting the synthesis of an automatic control system of asynchronous motor velocity control using Bellman-Lyapunov\\u000a functions, as well as methods of decomposition, decentralization, and aggregation and Lyapunov functions has been developed;\\u000a it has resulted in suboptimal control. The system does not use vector control methods for motor control. Compared with frequency\\u000a control systems with velocity-closed loops, the proposed

V. F. Kudin; O. I. Kiselichnik

2008-01-01

455

Consideration of Motor Control Responses during Voltage Saturation of PWM Inverter  

NASA Astrophysics Data System (ADS)

During the voltage saturation of a PWM inverter driving a motor, the torque control characteristics of the motor deteriorate because the controller can control only the phase of the output voltage. The cross-coupling current control scheme is a control scheme for motors, and it can be used to shift from the variable voltage mode to the voltage saturation mode seamlessly, and vice versa. This paper shows numerical simulation results and the torque response when the control scheme is used during voltage saturation.

Makishima, Shingo; Uezono, Keiichi; Nagai, Masao

456

Genetic algorithm based induction machine characterization with application to adaptive maximum torque per amp control  

Microsoft Academic Search

There has been considerable research in developing improved induction motor models. One recently developed model simultaneously includes magnetizing path saturation, leakage saturation, and a highly flexible transfer function approach to represent the rotor circuits. This alternate QD model (AQDM) is also computationally efficient in that it is non-iterative at each time step. It is considerably more accurate than the classical

Chunki Kwon

2005-01-01

457

Controlling a Four-Quadrant Brushless Three-Phase dc Motor  

NASA Technical Reports Server (NTRS)

Control circuit commutates windings of brushless, three-phase, permanent-magnet motor operating from power supply. With single analog command voltage, controller makes motor accelerate, drive steadily, or brake regeneratively, in clockwise or counterclockwise direction. Controller well suited for use with energy-storage flywheels, actuators for aircraft-control surfaces, cranes, industrial robots, and other electromechanical systems requiring bidirectional control or sudden stopping and reversal.

Nola, F. J.

1986-01-01

458

Motor Disorder and Anxious and Depressive Symptomatology: A Monozygotic Co-Twin Control Approach  

ERIC Educational Resources Information Center

The aim of this study was to investigate the relationship between poor motor ability and anxious and depressive symptomatology in child and adolescent monozygotic twins. The co-twin control design was used to explore these mental health issues in MZ twins concordant and discordant for a motor disorder, and controls. This methodology offers the

Pearsall-Jones, Jillian G.; Piek, Jan P.; Rigoli, Daniela; Martin, Neilson C.; Levy, Florence

2011-01-01

459

Adaptive robust tracking control for compliant-joint mechanical arms with motor dynamics  

Microsoft Academic Search

Investigates the tracking control problem of an elastic-joint mechanical manipulator with DC motor dynamics. We present an adaptive variable structure control scheme to circumvent such problems. It only requires the measurements of position and velocity signals of links and motor shafts as well as the armature current. Besides, all the system parameters are assumed to be unknown a priori, and

Jung-Hua Yang

1999-01-01

460

An improved nonlinear control design for series DC motors Michael J. Burridge a  

E-print Network

nonlinear robust control can be designed. Specifically, unknown variations in load torque and armatureAn improved nonlinear control design for series DC motors Michael J. Burridge a , Zhihua Qu b 30 March 2001 Abstract A series DC motor must be represented by a nonlinear model when nonlinearities

Qu, Zhihua

461

Application study overview of magnetic suspension and magnetic suspension motor control technology  

Microsoft Academic Search

Magnetic suspension and magnetic suspension motor control technology have developed with the development of magnetic suspension technology. In recent years, researches on magnetic suspension and magnetic suspension motor control technology are getting more and more active, and have made a lot of satisfactory achievement. This article systemically summarizes research achievement and current status all these years on magnetic suspension and

Hu Junda; Ye Yunyang; Zou Wenbin; Jiang Yan

2010-01-01

462

Sensorless position control of linear tubular motors with pulsating voltage injection and improved position observer  

Microsoft Academic Search

The sensorless position control of permanent magnet motors can be successfully implemented by superimposing a high-frequency voltage on the control voltage. The accuracy of the method relies on a fast and accurate signal processing of the measured quantities and on the compensation of the inverter and motor non idealities. In this paper the position estimation is obtained by adding a

F. Cupertino; P. Giangrande; L. Salvatore; G. Pellegrino

2009-01-01

463

High gain feedback control of direct-drive motor system by a homogeneous ER fluid  

Microsoft Academic Search

Because a direct-drive (DD) motor system does not use a reduction gear unit, the drive system can be made constructively simple and stiff. However, the disturbance torque directly influences the motor shaft. High gain feedback control is effective for reducing the influence of the disturbance torque. The high servo gain makes the control system vibratory or unstable. Therefore, the servo

K. Koyanagi; Naoyuki TAKESUE; G. Zhang; M. Sakaguchi; J. Furusho

2000-01-01

464

High Stiffness Control of Direct-Drive Motor System by a Homogeneous ER Fluid  

Microsoft Academic Search

Since a direct-drive (DD) motor system does not have the reduction gear, its structure is simple and has stiffness. In the DD motor system, the disturbance torque directly influences the control accuracy. The high servo stiffness is effective and important for reducing the influence of the disturbance torque. However, the high servo control often makes the system vibratory or unstable.

Naoyuki Takesue; Guoguang Zhang; Junji Furusho; Masamichi Sakaguchi

1999-01-01

465

Excitation and control of a high-speed induction generator  

E-print Network

This project investigates the use of a high speed, squirrel cage induction generator and power converter for producing DC electrical power onboard ships and submarines. Potential advantages of high speed induction generators ...

Englebretson, Steven Carl

2005-01-01

466

78 FR 20881 - Control of Air Pollution From Motor Vehicles: Tier 3 Motor Vehicle Emission and Fuel Standards...  

Federal Register 2010, 2011, 2012, 2013

...proposed rule ``Control of Air Pollution from Motor Vehicles: Tier...emissions from passenger cars, light-duty trucks, medium- duty...important source of exposure to air pollution both regionally and near roads...fuel efficiency standards for light-duty vehicles, as part...

2013-04-08

467

AC Servo Motor Based Position Sensorless Control System Making Use of Springs  

NASA Astrophysics Data System (ADS)

This paper describes a position sensorless control technique on AC servo motor based position control systems. Shimada et al. had previously presented a paper on a DC servo motor based position sensorless control technique using mechanical springs. It was based on a point of view that mechanical springs form the key components for the observability. On the basis of the result obtained from the successful experiment, we assumed that the AC servo motor position sensorless control system would be identical. Using vector control, the controller needs the data of the magnetic pole position on the rotor of the AC servo motor. It is not perfect sensorless control, since it use a rotary encoder. However, we introduce it and demonstrate the expreimental results as an initial step in the new control technology.

Shimada, Akira; Kishiwada, Yu; Arimura, Michiyo

468

Extracellular adenosine controls NKT-cell-dependent hepatitis induction.  

PubMed

Extracellular adenosine regulates inflammatory responses via the A2A adenosine receptor (A2AR). A2AR deficiency results in much exaggerated acute hepatitis, indicating nonredundancy of adenosine-A2AR pathway in inhibiting immune activation. To identify a critical target of immunoregulatory effect of extracellular adenosine, we focused on NKT cells, which play an indispensable role in hepatitis. An A2AR agonist abolished NKT-cell-dependent induction of acute hepatitis by concanavalin A (Con A) or ?-galactosylceramide in mice, corresponding to downregulation of activation markers and cytokines in NKT cells and of NK-cell co-activation. These results show that A2AR signaling can downregulate NKT-cell activation and suppress NKT-cell-triggered inflammatory responses. Next, we hypothesized that NKT cells might be under physiological control of the adenosine-A2AR pathway. Indeed, both Con A and ?-galactosylceramide induced more severe hepatitis in A2AR-deficient mice than in WT controls. Transfer of A2AR-deficient NKT cells into A2AR-expressing recipients resulted in exaggeration of Con A-induced liver damage, suggesting that NKT-cell activation is controlled by endogenous adenosine via A2AR, and this physiological regulatory mechanism of NKT cells is critical in the control of tissue-damaging inflammation. The current study suggests the possibility to manipulate NKT-cell activity in inflammatory disorders through intervention to the adenosine-A2AR pathway. PMID:24448964

Subramanian, Meenakshi; Kini, Radhika; Madasu, Manasa; Ohta, Akiko; Nowak, Michael; Exley, Mark; Sitkovsky, Michail; Ohta, Akio

2014-04-01

469

Are Articulatory Settings Mechanically Advantageous for Speech Motor Control?  

PubMed Central

We address the hypothesis that postures adopted during grammatical pauses in speech production are more mechanically advantageous than absolute rest positions for facilitating efficient postural motor control of vocal tract articulators. We quantify vocal tract posture corresponding to inter-speech pauses, absolute rest intervals as well as vowel and consonant intervals using automated analysis of video captured with real-time magnetic resonance imaging during production of read and spontaneous speech by 5 healthy speakers of American English. We then use locally-weighted linear regression to estimate the articulatory forward map from low-level articulator variables to high-level task/goal variables for these postures. We quantify the overall magnitude of the first derivative of the forward map as a measure of mechanical advantage. We find that postures assumed during grammatical pauses in speech as well as speech-ready postures are significantly more mechanically advantageous than postures assumed during absolute rest. Further, these postures represent empirical extremes of mechanical advantage, between which lie the postures assumed during various vowels and consonants. Relative mechanical advantage of different postures might be an important physical constraint influencing planning and control of speech production. PMID:25133544

Ramanarayanan, Vikram; Lammert, Adam; Goldstein, Louis; Narayanan, Shrikanth

2014-01-01

470

Neural-network-based model reference adaptive systems for high-performance motor drives and motion controls  

Microsoft Academic Search

A number of techniques have been developed for estimation of speed or position in motor drives. The accuracy of these techniques is affected by the variation of motor parameters such as the stator resistance, stator inductance, or torque constant. For example, the conventional linear estimators are not adaptive to variations of the operating point. The model reference adaptive systems (MRASs)

Malik E. Elbuluk; Liu Tong; Iqbal Husain

2002-01-01

471

Three-Phase Power Factor Controller  

NASA Technical Reports Server (NTRS)

Three-Phase Power-Factor Controller develops a control signal for each motor winding. As motor loading decreases, rms value of applied voltage is decreased by feedback-control circuit. Power consumption is therefore lower than in unregulated operation. Controller employs phase detector for each of three phases of delta-connected induction motor. Phase-difference sum is basis for control.

Nola, F. J.

1982-01-01

472

Transient tracking of low and high-order eccentricity-related components in induction motors via TFD tools  

NASA Astrophysics Data System (ADS)

The present work is focused on the diagnosis of mixed eccentricity faults in induction motors via the study of currents demanded by the machine. Unlike traditional methods, based on the analysis of stationary currents (Motor Current Signature Analysis (MCSA)), this work provides new findings regarding the diagnosis approach proposed by the authors in recent years, which is mainly focused on the fault diagnosis based on the analysis of transient quantities, such as startup or plug stopping currents (Transient Motor Current Signature Analysis (TMCSA)), using suitable time-frequency decomposition (TFD) tools. The main novelty of this work is to prove the usefulness of tracking the transient evolution of high-order eccentricity-related harmonics in order to diagnose the condition of the machine, complementing the information obtained with the low-order components, whose transient evolution was well characterised in previous works. Tracking of high-order eccentricity-related harmonics during the transient, through their associated patterns in the time-frequency plane, may significantly increase the reliability of the diagnosis, since the set of fault-related patterns arising after application of the corresponding TFD tool is very unlikely to be caused by other faults or phenomena. Although there are different TFD tools which could be suitable for the transient extraction of these harmonics, this paper makes use of a Wigner-Ville distribution (WVD)-based algorithm in order to carry out the time-frequency decomposition of the startup current signal, since this is a tool showing an excellent trade-off between frequency resolution at both high and low frequencies. Several simulation results obtained with a finite element-based model and experimental results show the validity of this fault diagnosis approach under several faulty and operating conditions. Also, additional signals corresponding to the coexistence of the eccentricity and other non-fault related phenomena making difficult the diagnosis (fluctuating load torque) are included in the paper. Finally, a comparison with an alternative TFD tool - the discrete wavelet transform (DWT) - applied in previous papers, is also carried out in the contribution. The results are promising regarding the usefulness of the methodology for the reliable diagnosis of eccentricities and for their discrimination against other phenomena.

Climente-Alarcon, V.; Antonino-Daviu, J.; Riera-Guasp, M.; Pons-Llinares, J.; Roger-Folch, J.; Jover-Rodriguez, P.; Arkkio, A.

2011-02-01

473

Design of PLC-based PI controller for the permanent magnet DC motor under real constraints and disturbances  

Microsoft Academic Search

The purpose of this paper is to analyse and implement PI control for the permanent magnet DC motor. The control algorithm is realised using Siemens S7-200 programmable logic controller (PLC). The complex motor system is composed of DC motor, driver and tachogenerator. The main objective is to achieve a satisfactory time response of the system output under disturbances like death

J. Velagic; K. Obarcanin; E. Kapetanovic; S. Huseinbegovic; N. Osmic

2009-01-01

474

A new method for speed control of a DC motor using magnetorheological clutch  

NASA Astrophysics Data System (ADS)

In this research, a new method to control speed of DC motor using magnetorheological (MR) clutch is proposed and realized. Firstly, the strategy of a DC motor speed control using MR clutch is proposed. The MR clutch configuration is then proposed and analyzed based on Bingham-plastic rheological model of MR fluid. An optimal designed of the MR clutch is then studied to find out the optimal geometric dimensions of the clutch that can transform a required torque with minimum mass. A prototype of the optimized MR clutch is then manufactured and its performance characteristics are experimentally investigated. A DC motor speed control system featuring the optimized MR clutch is designed and manufactured. A PID controller is then designed to control the output speed of the system. In order to evaluate the effectiveness of the proposed DC motor speed control system, experimental results of the system such as speed tracking performance are obtained and presented with discussions.

Nguyen, Quoc Hung; Choi, Seung-Bok

2014-03-01

475

Fuzzy auto-tuning PID control of multiple joint robot driven by ultrasonic motors.  

PubMed

A three-joint robot is directly driven by ultrasonic motors with advantage of high torque at low speed. The speed of the ultrasonic motors is actually controlled by regulating their operating frequencies. The kinematic and kinetic analyses of the robot have been carried out using Adams. Due to the lack of accurate control model of ultrasonic motors and the time-varying motor parameters, a fuzzy auto-tuning proportional integral derivative (PID) controller for the robot is experimented, in which a simple method to tune parameters of the PID type fuzzy controller on-line is developed and a new position-speed feedback strategy is proposed and implemented. The effectiveness of the proposed control strategy and fuzzy logic controller is verified by experimental investigation. PMID:17540429

Sun, Zhijun; Xing, Rentao; Zhao, Chunsheng; Huang, Weiqing

2007-11-01

476

Context-dependent neuroelectric responses during motor control.  

PubMed

Research on brain responses during motor control is usually performed under typical laboratory settings. However, everyday life and the laboratory differ in many aspects, such as purposeful and motivated behavior; and there's no awareness of "being measured" in everyday life. In the laboratory, movements are usually explicitly instructed, overtly measured and follow no intrinsic motivated purpose. Therefore, here we present a new method to measure and reliably analyze neuroelectric brain responses by EEG, as well as kinematics during the performance of grasping movements in two different behavioral contexts. One context (L) simulates a typical laboratory task and another context (E) uses selected features of everyday behavior. However, in both tasks the mechanical constraints and stimuli for the movement are exactly the same. Amplitudes of event-related N200 and P300 measured at the brain's midline were differentially affected by the two contexts. P300 was increased in L compared to E. N200 was distinct at anterior electrode sites (Fz, Cz) in context E, while it was elevated at posterior electrode sites (Pz, Oz) in context L. For the first time, kinematic and electrophysiological recordings are combined to analyze identical movements, performed in varied behavioral contexts. The results indicate that brain responses measured under typical laboratory context may not be necessarily transferred to everyday life; thus, the present approach offers a wide range of new questions to analyze context-dependent brain responses. PMID:25541038

Steinberg, Fabian; Vogt, Tobias

2015-03-15

477

Prototype Motor Controllers Demonstrated for the James Webb Space Telescope Cryogenic Environment  

NASA Technical Reports Server (NTRS)

NASA is in the process of designing the James Webb Space Telescope. This telescope will investigate images of objects in deep space (stars, galaxies, etc.) by using light in the infrared region of the light spectrum. To make such observations, the telescope must have light sensors that operate at very cold temperatures, near absolute zero. To achieve this low-temperature tolerance, designers must place the light sensors behind a Sun shield that will prevent sunlight, and its heat, from reaching the sensors. In this cold region inside the telescope, electric motors and some motor controls must operate at temperatures near 40 K (40 degrees above absolute zero). These motors will be used to position light filters needed by the telescope. There are motors that operate at the low temperatures, but there is little technology for low-temperature motor-control electronics. The drawing shows how the motors and their controls are positioned behind the Sun shield. Simplified version of the layout of the motor and control electronics that are located, as dictated by mission requirements, in the cold zone of the James Webb Space Telescope. A Sun shield provides protection and isolation of these electronics from the heat of the rays of the sun. Room temperature compoenets (control computer, motor select command, motor phase drive, power supply, parallel to serial, and sun shield) as well as 40-kelvin components (motor select, serial to parallel, and motors) are shown. The Low Temperature Electronics Group at the NASA Glenn Research Center has been working to develop motor control electronics that will operate at a temperature of 40 K. The group conducted tests to determine which electronic components will operate at such very low temperatures. Then, components that were determined to operate successfully at the low temperatures were used to design low-temperature motor-controller circuits. A prototype motor controller circuit was built, evaluated, and demonstrated to operate at 70 K. Next, Glenn researchers plan to determine circuit performance at much colder temperatures--down to 40 K. This low-temperature program was supported by the James Webb Space Telescope Electrical Systems Design Group at the NASA Goddard Space Flight Center and by the NASA Electronic Parts and Packaging Program at NASA Headquarters and the Jet Propulsion Laboratory.

Patterson, Richard L.; Hammond, Ahmad

2004-01-01

478

Characterization of induction motors in adjustable-speed drives using a time-stepping coupled finite-element state-space method including experimental validation  

Microsoft Academic Search

This paper describes how a comprehensive time-stepping coupled finite element phase flux linkage-based state-space modeling approach can be used for the characterization of induction motors in adjustable-speed drives. The model implemented the faster indirect and iterative coupling approach based on the curl-curl nondiffusion equation rather than the direct coupling approach, which is based on the curl-curl diffusion equation. The model

Nabeel A. O. Demerdash; John F. Bangura

1999-01-01

479

A time-stepping coupled finite element-state space model for induction motor drives. I. Model formulation and machine parameter computation  

Microsoft Academic Search

A time-stepping coupled finite element-state-space model for induction motor drives is developed. The model utilizes an iterative approach to include the effects of magnetic nonlinearities, and space harmonics due to the machine magnetic circuits' topology and discrete winding layouts. Model formulation and development, which include an improvement in the layout of the cage circuit representation, are given in this paper.

N. A. Demerdash; J. F. Bangura; A. A. Arkadan

1999-01-01

480

A time-stepping coupled finite element-state space model for induction motor drives. I. Model formulation and machine parameter computation  

Microsoft Academic Search

A time-stepping coupled finite element-state-space model for induction motor drives is developed. The model utilizes an iterative approach to include the effects of magnetic nonlinearities, and space harmonics due to the machine magnetic circuits' topology and discrete winding layouts. Model formulation and development which include an improvement in the layout of the cage circuit representation, are given in this paper.

N. A. Demerdash; J. F. Bangura; A. A. Arkadan

1997-01-01

481

A novel double-circuit-rotor balanced induction motor for improved slip-energy recovery drive performance. Part 1: Modeling and simulation  

Microsoft Academic Search

A new construction for the rotor windings of balanced wound-rotor induction motors employed in the slip-energy recovery drives is proposed, in this paper, to reduce the time harmonics which are commonly generated in the machine. The propose machine has a double-circuit in the rotor. One circuit is star connected while the other is delta connected. Each of these two circuits

W. S. Zakaria; S. R. Alwash; A. A. Shaltout

1996-01-01

482

Decoupled Space-Vector PWM Strategies for a Four-Level Asymmetrical Open-End Winding Induction Motor Drive With Waveform Symmetries  

Microsoft Academic Search

In this paper, two space-vector-based pulsewidth modulation (PWM) (SVPWM) strategies named equal- and proportional-duty SVPWMs are described, which are used to syn- thesize a four-level waveform from an open-end winding con- figuration of an induction motor. Two isolated dc-link voltages, which are in the ratio of 2 : 1, are employed to achieve this objective. Both of these PWM strategies

Barry Venugopal Reddy; Veeramraju Timurala Somasekhar; Yenduri Kalyan

2011-01-01

483

A Five-Level Inverter Scheme for a Four-Pole Induction Motor Drive by Feeding the Identical Voltage-Profile Windings From Both Sides  

Microsoft Academic Search

This paper presents a five-level inverter scheme with four two-level inverters for a four-pole induction motor (IM) drive. In a conventional three-phase four-pole IM, there exists two identical voltage-profile winding coil groups per phase around the armature, which are connected in series and spatially apart by two pole pitches. In this paper, these two identical voltage-profile pole-pair winding coils in

K. Sivakumar; Anandarup Das; Rijil Ramchand; Chintan Patel; K. Gopakumar

2010-01-01

484

Direct voltage control for standalone wind energy conversion systems with induction generator and energy storage  

Microsoft Academic Search

A control method for standalone wind energy conversion systems with induction generator and energy storage system (ESS) is proposed in this paper. A fixed-speed self-excited induction generator is directly connected to the standalone power system. An ESS is employed to compensate the power variation from wind generator and load, maintain the power flow balanced. A direct voltage control scheme is

Wei Huang; D. W. Xu

2008-01-01

485

Motor control and cerebral hemispheric specialization in highly qualified judo wrestlers  

Microsoft Academic Search

With the purpose of investigating motor and cognitive lateralization profiles associated with long-term motor training, we investigated differences in hemispheric specialization between proficient judo sportsmen and controls through the assessment of a number of handedness and footedness items including postural preferences as well as dichotic listening and lateralized visual field tests. Our data show that: (1) the different handedness and

Maxim Mikheev; Christine Mohr; Sergei Afanasiev; Theodor Landis; Gregor Thut

2002-01-01

486

Study of High Power Motor Intelligent Protection Controller Based on PIC Singlechip  

Microsoft Academic Search

In response to industry power motor cannot directly starting and stopping issues, a high power motor intelligent protection controller based on PIC singlechip is proposed in this paper. Intelligent soft starter design principles based on PIC singlechip is articulated. The hardware circuit design, software flow design and test data analysis are given in details. By producting in Zibo Galaxy high-technology

Jishun Jiang; Lina Liu; Tian Jiang

2010-01-01