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1

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

2

Symmetry Based Control of Induction Motor  

NASA Astrophysics Data System (ADS)

In this paper symmetry based control of induction motor is proposed. The fifth order model of Induction motor is reduced to the base coordinates which is decoupled from the fiber dynamics by using a regular static feedback. This makes the control of Induction motor similar to the control of separately excited D.C. motor. This paper shows that the selection of a particular frame of reference for the two phase equivalent model depends on the control objectives which are to be taken as the base coordinates.

Monika, M.; Singh, N. M.; Bhil, S. K.

2008-10-01

3

Fuzzy logic control of AC induction motors  

NASA Astrophysics Data System (ADS)

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 is discussed. Electric motors use 60 percent of the electrical energy generated in the U.S. An improvement of 1 percent in operating efficiency of all electric motors could result in savings of 17 billion kWh per year in the U.S. New techniques are required to extract maximum performance from modern motors. One possibility, FLC, has recently demonstrated success in solving control problems of nonlinear, multivariable systems such as ac induction motors and adjustable motor-speed drives. Simulated results of a microprocessor-based fuzzy logic motor controller (FLMC) are described. The investigation includes a motor stator voltage control scheme to minimize motor input power at specified speed/torque conditions; simulation of ac motor performance; and development of a FLMC for optimized motor efficiency. Simulated FLMC results compare favorably with other motor control approaches. Potential energy savings are quantitated based on the preliminary predictions of FLMC performance.

Cleland, J.; Turner, W.; Wang, P.; Espy, T.; Chappell, P. J.

4

Four quadrant control of induction motors  

NASA Technical Reports Server (NTRS)

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.

1991-01-01

5

Dynamic neural controllers for induction motor.  

PubMed

The paper reports application of recently developed adaptive control techniques based on neural networks to the induction motor control. This case study represents one of the more difficult control problems due to the complex, nonlinear, and time-varying dynamics of the motor and unavailability of full-state measurements. A partial solution is first presented based on a single input-single output (SISO) algorithm employing static multilayer perceptron (MLP) networks. A novel technique is subsequently described which is based on a recurrent neural network employed as a dynamical model of the plant. Recent stability results for this algorithm are reported. The technique is applied to multiinput-multioutput (MIMO) control of the motor. A simulation study of both methods is presented. It is argued that appropriately structured recurrent neural networks can provide conveniently parameterized dynamic models for many nonlinear systems for use in adaptive control. PMID:18252531

Brdy?, M A; Kulawski, G J

1999-01-01

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

Field oriented control of induction motors using neural networks decouplers  

Microsoft Academic Search

This paper presents a novel approach to field oriented control (FOC) of induction motor drives. It discusses the introduction of artificial neural networks (ANN) in the area of decoupling control of induction motors using field oriented control principles. Two ANNs are presented for direct and indirect FOC applications. The first performs estimation of the stator flux and the second is

A. Ba-Razzouk; A. Cheriti; G. Olivier; P. Sicard

1995-01-01

8

Power factor control system for AC induction motors  

NASA Technical Reports Server (NTRS)

A power factor control system for use with ac induction motors was designed which samples lines voltage and current through the motor and decreases power input to the motor proportional to the detected phase displacement between current and voltage. This system provides, less power to the motor, as it is less loaded.

Nola, F. J. (inventor)

1977-01-01

9

Flux harmonic spectrum processing of direct torque controlled induction motor  

Microsoft Academic Search

The flux spectrum is greatly influenced by flux and torque controller hysteresis loops (dead bands) in direct torque control of AC motors. On the other hand, iron loss in induction motors is closely related to flux harmonics. Hence, the flux spectrum must be observed in the control process to minimize motor losses. In this paper, the relation between the magnetic-flux

S. Kaboli; M. R. Zolghadri

2003-01-01

10

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...

11

Vector control of induction motor with fuzzy PI controller  

Microsoft Academic Search

A description is presented of the fuzzy proportional-plus-integral controller for the vector control system of an induction motor, and the performance of the system using this controller is discussed. The theoretical process of the fuzzy inference and the guide to a design of the controller are presented. This controller is applied to the laboratory model drive system with 0.75 kW

Ichiro Miki; Naoshi Nagai; Sakae Nishiyama; Tetsuo Yamada

1991-01-01

12

Neural estimators for shaft sensorless FOC control of induction motor  

Microsoft Academic Search

The paper deals with a problem of speed estimation in a shaft sensorless field oriented control structure with induction motor that is based on neural modelling approach. Two different neural estimators were developed; one for observing the magnetic flux and the other one for observing motor angular speed. Structures of the artificial neural network estimators are based on measurable motor

Peter Girovský; Jaroslav Timko; J. Z?ilkova?; V. Feda?k

2010-01-01

13

Power factor control system for ac induction motors  

NASA Technical Reports Server (NTRS)

A power control circuit for an induction motor is disclosed in which a servo loop is used to control power input by controlling the power factor of motor operation. The power factor is measured by summing the voltage and current derived square wave signals.

Nola, F. J. (inventor)

1981-01-01

14

MIMO Indirect Adaptive Fuzzy Control of Induction Motors  

Microsoft Academic Search

This paper presents a new adaptive fuzzy control technique applied to induction motors (IM). The control task of such motors is considered complicated by the fact that these motors have uncertain time-varying parameters and are subjected to unknown load disturbance. A nonlinear multi-input multi-output (MIMO) state feedback linearizing control is designed for the IM modeled in a stationary reference frame.

Manal Wahba

2007-01-01

15

Vector control of induction motor without shaft encoder  

Microsoft Academic Search

A method of torque control in induction motor drives that requires not shaft encoder is presented. Both the torque control and the speed control are based on vector control. The proposed scheme of vector control is based on the self-control of rotor flux velocity, which is controlled with the torque-producing current and the rotor flux derived from the stator voltages

T. Ohtani; N. Takada; K. Tanaka

1989-01-01

16

Control system for an induction motor with energy recovery  

NASA Technical Reports Server (NTRS)

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. (inventor)

1983-01-01

17

Speed sensorless hybrid vector controlled induction motor drive  

Microsoft Academic Search

The paper describes a speed and flux sensorless vector-controlled induction motor drive primarily aimed for electric vehicle type applications. The stator flux oriented drive starts at zero speed in indirect vector control mode, transitions to direct vector control mode as the speed develops, and then transitions back to indirect vector control at zero speed. The vector control uses stator flux

Bimal K. Bose; M. Godoy Simoes; David R. Crecelius; Kausik Rajashekara; R. Martin

1995-01-01

18

Model reference current control of a unipolar induction motor drive  

Microsoft Academic Search

A control algorithm to yield the required current shaping control of a three active switch, three-phase unipolar drive system for an induction motor is derived in this paper. The method utilizes terminal voltage control through PWM to properly shape the phase currents. Phase voltages are calculated based on both the fundamental frequency and zero sequence steady-state equivalent circuits of an

Brian A. Welchko; Thomas A. Lipo

2001-01-01

19

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

20

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

21

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

22

Fuzzy adaptive vector control of induction motor drives  

Microsoft Academic Search

This paper deals with the design and experimental realization of a model reference adaptive control (MRAC) system for the speed control of indirect field-oriented (IFO) induction motor drives based on using fuzzy laws for the adaptive process and a neuro-fuzzy procedure to optimize the fuzzy rules. Variation of the rotor time constant is also accounted for by performing a fuzzy

Emanuele Cerruto; Alfio Consoli; Angelo Raciti; Antonio Testa

1997-01-01

23

Direct torque control of induction motor-variable switching sectors  

Microsoft Academic Search

An induction motor drive based on direct torque control (DTC) allows high dynamic performance to be obtained with a very simple hysteresis control scheme. In this paper, the problem of stator flux drooping at low speeds has been investigated. By rotating the original flux sectors defined for conventional DTC near the sector boundaries, it is possible to maintain stator flux

C. G. Mei; S. K. Panda; J. X. Xu; K. W. Lim

1999-01-01

24

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

25

A single current sensor control technique for induction motors  

Microsoft Academic Search

This paper describes a single current sensor control technique for induction motors that uses only a single DC-link current sensing resistor to obtain the information of three line currents. The principal motivation is to reduce the cost, and improve the reliability of a drive system. However, in certain conditions, the measurement is distorted due to the too narrow current pulse

Chunpeng Zhang; Fei Lin

2002-01-01

26

Digital implementation of neural network inverse control for induction motor based on DSP  

Microsoft Academic Search

The induction motor is multi-variable, nonlinear and strong-coupled system. Due to parameters' variation during operation of induction motor, the decoupling and linearization implemented by field oriented control and analytical inverse control is destroyed. For that, a novel linearization and decoupling method named as artificial neural network (ANN) inverse for induction motor control is proposed. With the combination of neural network

Yongxian Song; Juanli Ma; Hanxia Zhang; Naibao He

2010-01-01

27

Direct torque control, induction motor vector control without an encoder  

Microsoft Academic Search

The basic evolution of direct torque control from other drive types is explained. Qualitative comparisons with other drives are included. The basic concepts behind direct torque control are clarified. An explanation of direct self control and the field-orientation concepts implemented in the adaptive motor model block is presented. The reliance of the control method on fast processing techniques is stressed.

James N. Nash

1997-01-01

28

Microprocessor Control of a Three-Phase Inverter in Induction Motor Speed Control System  

Microsoft Academic Search

The speed control of a three-phase induction motor using the Fairchild F8 microprocessor is described in this paper. In this system, the microprocessor computes the actual motor speed from the pulses received from a shaft encoder, compares the actual and desired speeds, and uses the difference to adjust the frequency of the inverter that feeds the motor. The microprocessor simultaneously

Vithal V. Athani; Sudhir M. Deshpande

1980-01-01

29

Chattering reduction in the position control of induction motor using the sliding mode  

Microsoft Academic Search

An induction motor position control system based on the sliding mode control is presented. In the sliding mode control, the control function is discontinuous on the hyperplane, which causes harmful effects such as current harmonics and acoustic noise in the motor drive application. A low-pass filter is introduced between the sliding mode controller output and the motor controller input to

Min-Ho Park; Kyung-Seo Kim

1991-01-01

30

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

31

A new approach to vector control for a linear induction motor considering end effects  

Microsoft Academic Search

An equivalent circuit model in the rotor flux oriented frame is developed for the vector control of a linear induction motor (LIM) by adding the so called “end effect” to the rotary induction motor (RIM) model. We describe the effects of the end effect by introducing speed dependent scale factors to the magnetizing inductance and series resistance in the d-axis

Jeong-Hyoun Sung; Kwanghee Nam

1999-01-01

32

Forward and reverse control system for induction motors  

DOEpatents

A control system for controlling the direction of rotation of a rotor of an induction motor includes an array of five triacs with one of the triacs applying a current of fixed phase to the windings of the rotor and four of the triacs being switchable to apply either hot ac current or return ac current to the stator windings so as to reverse the phase of current in the stator relative to that of the rotor and thereby reverse the direction of rotation of the rotor. Switching current phase in the stator is accomplished by operating the gates of pairs of the triacs so as to connect either hot ac current or return ac current to the input winding of the stator. 1 fig.

Wright, J.T.

1987-09-15

33

Design and implementation of PLC-based monitoring control system for induction motor  

Microsoft Academic Search

The implementation of a monitoring and control system for the induction motor based on programmable logic controller (PLC) technology is described. Also, the implementation of the hardware and software for speed control and protection with the results obtained from tests on induction motor performance is provided. The PLC correlates the operational parameters to the speed requested by the user and

Maria G. Ioannides

2004-01-01

34

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

35

PWM Inverter-Fed Induction Motor-Based Electrical Vehicles Fault-Tolerant Control  

E-print Network

-tolerant capabilities for such systems. In particular, voltage source inverters are a key component of these electricPWM Inverter-Fed Induction Motor-Based Electrical Vehicles Fault-Tolerant Control Bekheïra Tabbache proposes a fault-tolerant control scheme for PWM inverter-fed induction motor-based electric vehicles

Paris-Sud XI, Université de

36

Robust speed identification for speed-sensorless vector control of induction motors  

Microsoft Academic Search

This paper describes a new approach to estimating induction motor speed from measured terminal voltages and currents for speed-sensorless vector control. The proposed approach is based on observing the instantaneous reactive power of the motor. The estimated speed is used as feedback in an indirect vector control system. The described technique is very simple and robust to variations of motor

Fang-Zheng Peng; Tadashi Fukao

1994-01-01

37

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

E-print Network

Abstract--Controlling induction motors have been given a great deal of interest. Generally) the magnetic saturation effect is accounted for in the control design model; (ii) the induction motor-machine' are: (i) forcing the motor speed to track a varying reference signal and optimizing the rotor flux

Paris-Sud XI, Université de

38

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...

39

An effective method for rotor resistance identification for high-performance induction motor vector control  

Microsoft Academic Search

An effective method for rotor resistance identification is presented for the purpose of improving the performance of vector control of induction motor drives. The method is mathematically derived from proper selection of coordinate axes and utilization of the steady-state model of the induction motor. The major advantages of the method lie in its simplicity and accuracy. A series of computer

C. C. Chan; HUAQIAN WANG

1990-01-01

40

Speed-sensorless vector control of an induction motor using neural network speed estimation  

Microsoft Academic Search

In this paper, a novel speed estimation method of an induction motor using neural networks (NNs) is presented. The NN speed estimator is trained online by using the error backpropagation algorithm, and the training starts simultaneously with the induction motor working. The estimated speed is then fed back in the speed control loop, and the speed-sensorless vector drive is realized.

Seong-Hwan Kim; Tae-Sik Park; Ji-Yoon Yoo; Gwi-Tae Park

2001-01-01

41

Speed sensorless vector control of an induction motor using an extended Kalman filter  

Microsoft Academic Search

The vector control of an induction motor by speed estimation using an extended Kalman filter (EKF) is described. The rotor speed is regarded as a parameter, and the composite state is composed of the original state and the rotor speed. The EKF is employed to identify the speed of an induction motor and rotor magnetic flux based on the measured

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

1992-01-01

42

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 the EV propulsion systems is a very important step that requires special attention. In fact

Brest, Université de

43

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...

44

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...

45

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

46

A fully digitized field-oriented controlled induction motor drive using only current sensors  

Microsoft Academic Search

A field-oriented control method based on a predictive observer with digital current regulation of an induction motor, without speed and voltage sensors, is proposed. Measuring only stator currents and estimating motor speed and rotor fluxes by a predictive state observer with variable pole selection the stator currents are controlled to be exactly equal to the reference currents at every sampling

Lazhar Ben-Brahim; Atsuo Kawamura

1992-01-01

47

Vector control of induction motor without shaft encoder  

Microsoft Academic Search

A method of introduction motor drive that requires no shaft encoder is presented. This system has both torque and speed controls that are performed by vector control. The vector-control scheme is based on a rotor-flux speed control, which is performed by torque-producing current and rotor flux, derived from the stator voltages and currents. If it is possible to obtain both

Tsugutoshi Ohtani; Noriyuki Takada; Koji Tanaka

1992-01-01

48

Robust speed identification for speed sensorless vector control of induction motors  

Microsoft Academic Search

An approach to estimating induction motor speed from measured terminal voltages and currents for speed-sensorless vector control is described. The proposed technique is very simple and robust to variations of motor parameters. This approach is not dependent upon the knowledge of the value of the stator resistance, nor is it affected by stator-resistance thermal variations. Pure integration of sensed variables,

Fang-Zheng Peng; Tadashi Fukao

1993-01-01

49

Induction Motor Control Scheme for Battery-Powered Electric Car (GM-Electrovair I)  

Microsoft Academic Search

Several experimental vehicles have been built by the General Motors Corporation to investigate the technical feasibility of a battery-powered electric car using a variable speed induction motor. This paper describes the control scheme for the first experimental car¿Electrovair I.

Jalal T. Salihi; Paul D. Agarwal; George J. Spix

1967-01-01

50

Induction Motors Direct Field Oriented Control with Robust On-Line Tuning of Rotor Resistance  

E-print Network

Control (FOC) of induction motors has achieved a quick torque response, and has been applied in various industrial applications instead of dc motors. FOC, however, is very sensitive to flux estimation (magnitude the torque response and then the FOC dynamic performance. For these reasons, many research studies have been

Boyer, Edmond

51

FOC and DTC: two viable schemes for induction motors torque control  

Microsoft Academic Search

Field-oriented control and direct torque control are becoming the industrial standards for induction motors torque control. This paper is aimed at giving a contribution for a detailed comparison between the two control techniques, emphasizing advantages and disadvantages. The performance of the two control schemes is evaluated in terms of torque and current ripple, and transient response to step variations of

Domenico Casadei; Francesco Profumo; Giovanni Serra; Angelo Tani

2002-01-01

52

Robust vector control of induction motor without using stator and rotor circuit time constants  

Microsoft Academic Search

To solve the problem of performance degradation due to parameter variations in an indirect vector control of an induction motor, a novel and simple estimation method for the rotor circuit time constant is presented. The proposed method is based on regulating the energy stored in the magnetizing inductance, which can be calculated from the terminal voltages and currents. From theoretical

Kanokvate Tungpimolrut; Fang-Zheng Peng; Tadashi Fukao

1994-01-01

53

Analysis and Performance Evaluation of Triac-Voltage Controlled Capacitor Run Induction Motor  

Microsoft Academic Search

This article presents steady-state analysis and simulation of triac-voltage controlled capacitor run single-phase induction motor driving a domestic fan load. Two schemes of circuits, namely, line controlled and branch controlled configurations, suitable for speed control are considered and simulation results are presented. Also, the two schemes are compared in terms of motor efficiency, line current pollution, and input power factor,

K. SUNDARESWARAN; P. S. MANUJITH

2004-01-01

54

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

55

An Improved Fault-Tolerant Control Scheme for PWM Inverter-Fed Induction Motor-Based EVs  

E-print Network

for such systems. In particular, voltage source inverters are a key component of these electric motor drive systemsAn Improved Fault-Tolerant Control Scheme for PWM Inverter-Fed Induction Motor-Based EVs Bekheïra--This paper proposes an improved fault-tolerant control scheme for PWM inverter-fed induction motor

Paris-Sud XI, Université de

56

Asynchronous induction roller motors  

Microsoft Academic Search

Problems of designing special modifications of roller induction motors of ARM2P type for variable-frequency electric drives\\u000a have been considered. Motor designs, energy indices, and adjustment properties are presented.

A. E. Gusel’nikov; V. S. Baklin; P. R. Baranov

2008-01-01

57

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

58

Sensorless Control of Synchronous Reluctance Motors based on an Extended Electromotive Force Model and Inductance Measurement in the Model  

Microsoft Academic Search

In this paper, sensorless control for synchronous reluctance motors (SynRMs) without signal injection and an inductance measurement for position estimation are proposed. In the case of SynRMs, accuracy of inductances is the most important thing to realize precise position estimation because inductances are largely varied by a magnetic saturation phenomenon. Therefore, the inductance measurement method, which can measure appropriate inductances

Shinji Ichikawa; Mutuwo Tomita; Shinji Doki; Shigeru Okuma

2005-01-01

59

Stator Flux Oriented Control with Improved Integrator for Speed-Sensorless Induction Motor Drives  

Microsoft Academic Search

This paper presents a speed-sensorless control algorithm for induction motors, based on the stator flux-oriented control. The algorithm has the advantage of insensitivity to rotor parameters and load varying, stator flux and rotor speed is closed loop controlled respectively. The main improvement is that stator flux is estimated based on a modified integrator which is developed to solve the problems

Hao Zhang; Xianzhong Dai

2010-01-01

60

PLC-based fuzzy logic controller for induction-motor drive with constant V\\/Hz ratio  

Microsoft Academic Search

This paper presents the design and implementation of a PLC-based fuzzy logic controller for an induction motor speed control at constant V\\/Hz ratio. The PLC has arithmetic and logic operations instructions set that was utilized in the implementation of the fuzzy control of induction motor speed control. Fuzzy logic algorithm applies rules obtained from human expert of a system. The

M. Arrofiq; Nordin Saad

2007-01-01

61

Sensor and Sensorless Fault Tolerant Control for Induction Motors Using a Wavelet Index  

PubMed Central

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

62

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

63

Adaptive speed identification for vector control of induction motors without rotational transducers  

Microsoft Academic Search

A model-reference adaptive system (MRAS) for the estimation of induction motor speed from measured terminal voltages and currents is described. The estimated speed is used as feedback in a vector control system, thus achieving moderate bandwidth speed control without the use of shaft-mounted transducers. This technique is less complex and more stable than previous MRAS tacholess drives. It has been

C. Schauder

1992-01-01

64

Adaptive speed identification for vector control of induction motors without rotational transducers  

Microsoft Academic Search

A model-reference adaptive system (MRAS) for the estimation of induction motor speed from measured terminal voltages and currents is described. The estimated speed is used as feedback in a vector control system, thus achieving moderate bandwidth speed control without the use of shaft-mounted transducers. This technique is less complex and more stable than previous MRAS tacholess drives. It was implemented

Colin Schauder

1989-01-01

65

Adaptive vector control of a three-phase induction motor using neural networks  

Microsoft Academic Search

This work presents nonlinear techniques applied to the speed control of a three-phase squirrel-cage induction motor. Artificial neural networks are used to develop adaptive control strategies based on nonlinear dynamic system identification and nonlinear parameter estimation. The principal results include a nonlinear rotor flux observer based on recurrent neural networks, and a nonlinear rotor time constant estimator based on nonrecurrent

Fernando J. Von Zuben; Mhrcio L. A. Netto; Edson Bim; Jaime Szajner

1994-01-01

66

A Rotor Parameter Identification Scheme for Vector-Controlled Induction Motor Drives  

Microsoft Academic Search

A rotor parameter identification technique for the purpose of updating the control gains of an induction motor vector controller is described. The approach utilizes the current source nature of a current-regulated PWM inverter by injecting a prescribed negative sequence current perturbation signal. The corresponding negative sequence voltage is sensed and decomposed into its d and q components. By injecting the

Takayoshi Matsuo; Thomas A. Lipo

1985-01-01

67

Performances of fuzzy-logic-based indirect vector control for induction motor drive  

Microsoft Academic Search

This paper presents a novel speed control scheme of an induction motor (IM) using fuzzy-logic control. The fuzzy-logic controller (FLC) is based on the indirect vector control. The fuzzy-logic speed controller is employed in the outer loop. The complete vector control scheme of the IM drive incorporating the FLC is experimentally implemented using a digital signal processor board DS-1102 for

M. Nasir Uddin; Tawfik S. Radwan; M. Azizur Rahman

2002-01-01

68

Control of induction motor drives using modified-fuzzy logic methods  

Microsoft Academic Search

An investigation into the implementation of a PLC-based modified-fuzzy logic controller for an induction motor drive is presented. The controller consists of two control strategies i.e. a PID-type fuzzy logic controller and an incremental PID action. At the early stage of control action, the task is handled by PID-type fuzzy controller. When the absolute of error is less than a

Muhammad Arrofiq; Nordin Saad

2010-01-01

69

A novel vector control scheme for transistor PWM inverter-fed induction motor drive  

Microsoft Academic Search

A novel vector control scheme for a transistor pulse-width-modulation (PWM)-inverter-fed induction motor drive is presented. The system is based on a current control loop that consists of two independent nonlinear controllers that regulate the DC (field-oriented) components of the stator current vector. Three-level hysteresis comparators are used as current controllers. The outputs of the comparators select the appropriate inverter output

Marian P. Kazmierkowski; Waldemar Sulkowski

1991-01-01

70

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

71

State-Variable Steady-State Analysis of a Controlled Current Induction Motor Drive  

Microsoft Academic Search

The exact equations defining steady-state operation of a controlled current induction motor drive system are derived by solving the system state equations in the stationary reference frame. These equations, which assume ideal current filtering, eliminate the difficulties involved in taking derivatives of discontinuous currents by defining a pair of pseudocurrent variables. Effects of saturation are included by using the slope

Thomas A. Lipo; Edward P. Cornell

1975-01-01

72

Space vector PWM control of dual inverter fed open-end winding induction motor drive  

Microsoft Academic Search

A space vector PWM technique is developed based on the combination of space vectors from dual inverters feeding the induction motor from both ends (open-end winding without neutral point). A total of 64 voltage space vector combinations are available for PWM voltage control of the inverter fed machine with open-end winding. A space phasor based PWM scheme is proposed with

E. G. Shivakumar; K. Gopakumar; S. K. Sinha; Andrei Pittet; V. T. Ranganathan

2001-01-01

73

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

74

Direct torque control of an induction motor using a single current sensor  

Microsoft Academic Search

A novel scheme for the direct torque control (DTC) of an induction motor (IM) is proposed, which uses a single sensor of current inserted in the inverter dc link. The rationale behind the proposal is to develop a low-cost but high performance IM drive. The scheme exploits a simple and robust algorithm to reconstruct the stator currents needed to estimate

Manuele Bertoluzzo; Giuseppe Buja; Roberto Menis

2006-01-01

75

Research on control method of induction motor for fuel cell hybrid vehicles  

Microsoft Academic Search

A test and research platform of fuel cell hybrid system for electric vehicles is independently researched and developed. And then, an integrated designed project of power distribution unit for fuel cell hybrid vehicle is preliminarily analyzed. On that basis, a high efficiency, high performance and wide speed adjustable range control strategy of induction motor for fuel cell hybrid vehicle is

Zheyi Jiang; Dawei Gao; Jiajia Wu; Zhiyuan Xuan; Jieyuan Wei

2011-01-01

76

Decoupled control of attraction force and propulsion force in linear induction motor drive  

Microsoft Academic Search

As a special and distinct feature, the linear induction motor generates attractive force between the primary and secondary members in addition to the propulsive force, which brake the motion during accelerating as well as imposes the control problem owing to the coupled flux and motion dynamics with the advantage of reducing the possibility of derailment. In the present paper, the

Akshay Kumar Rathore; S. N. Mahendra

2003-01-01

77

A rule-based acceleration control scheme for an induction motor  

Microsoft Academic Search

This paper presents a rule-based acceleration control scheme which aims to give an inverter-fed induction motor excellent dynamic performance. In every time interval of the control process, the acceleration increments produced by two different voltage vectors are compared, yielding one optimum stator voltage vector which is selected and retained. The online inference control is built using a rule-based system and

K. L. Shi; T. F. Chan; Y. K. Wong; S. L. Ho

1999-01-01

78

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

79

An Elevator Speed-Control System Using Squirrel-Cage Induction Motors  

Microsoft Academic Search

An electronic control system with speed feedback to achieve excellent riding comfort and accurate floor-levelling in medium-speed elevators driven by squirrel-cage induction motors is described. Stepless control of both acceleration and deceleration of the elevator car is obtained, employing only two thyristors and two diodes in the power control circuit. Accurate floor levelling and smooth deceleration are achieved using a

K. Rajaraman; S. K. Nagaraja

1984-01-01

80

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

E-print Network

current, voltage and speed sensors faults that are detected and followed by control reconfiguration is proposed for an induction motor-based EV experiencing sensor faults (current, voltage, and speed) [3 adopted [4-5]. In general, DTC-based induction motor drives use two current sensors, two voltage sensors

Paris-Sud XI, Université de

81

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

82

Review of direct torque control methods for voltage source inverter-fed induction motors  

Microsoft Academic Search

This paper presents a review of recently used direct torque and flux control (DTC) techniques for voltage source inverter-fed induction motors. A variety of techniques, different in concept, are described as follows: switching table (ST) based hysteresis DTC, direct self control (DSC), constant switching frequency DTC with space vector modulation (DTC-SVM). Trends in the DTC-SVM techniques based on neuro fuzzy

Marian P. Kazmierkowski; Giuseppe Buja

2003-01-01

83

Microprocessor-Based Vector Control System for Induction Motor Drives with Rotor Time Constant Identification Function  

Microsoft Academic Search

A microprocessor-based high-performance vector control system for induction motor drives is discussed. In this system the high-performance current control method is employed, which can operate stably even when the saturation of a supplied voltage occurs. To estimate the rotor flux vector accurately, the powerful identification method of the rotor time constant is investigated, which does not require additional sensors for

Masato Koyama; Masao Yano; Isao Kamiyama; Sadanari Yano

1986-01-01

84

System-level power loss sensitivity to various control variables in vector-controlled induction motor drives  

Microsoft Academic Search

Vector-controlled induction motor drives include several design and control variables that affect power losses. Flux may be weakened to reduce machine losses; switching and conduction losses in the inverter are reduced by adjusting the flux ripple and current hysteresis bands. This paper combines the machine and inverter to investigate the effects of various control variables on the total system power

Ali M. Bazzi; Veysel T. Buyukdegirmenci; Philip T. Krein

2012-01-01

85

Inverse System Decoupling Control for Induction Motor Based on Neural Network On-Line Learning  

Microsoft Academic Search

The induction motor is a MIMO, nonlinear and high coupling system. The reversibility of the induction motor is testified. Consequently, a pseudo-linear system is completed by constructing a neural network inverse (NNI) system and combining it with the motor system. The inverse can transform the MIMO nonlinear system into two SISO linear subsystems (i.e., rotor speed and flux subsystems). In

Ni Wei; Zhang Yu

2009-01-01

86

A Sensorless AC-DC-AC Converter with Sliding Mode Controller for Induction Motors Drives  

Microsoft Academic Search

In this paper, a high power factor three-phase AC-DC-AC converter is presented. The driver includes a sensorless indirect field-oriented induction motor drive with a sliding-mode controller and a line-voltage- sensorless PWM synchronous rectifier with a nearly unity power factor. The mean targets have been basically: reduction in harmonic contamination produced by AC driver converters in the electric power supply network,

F. J. Maseda; O. Barambones; A. J. Garrido; I. Martija

87

Vector control of induction motors without shaft transducers  

Microsoft Academic Search

A field oriented control scheme is proposed, not requiring any shaft transducer. The flux-estimation problems in such conditions are considered. A suitable method is proposed and its theoretical limits are outlined. A prototype system has been implemented, on this basis, and the experimental results are given, confirming the practical feasibility for a wide field of applications.

A. Fratta; A. Vagati; F. Villata

1988-01-01

88

FPGA-Based Dynamically Reconfigurable Control of Induction Motor Drives  

E-print Network

Boecker University of Paderborn, Germany Power Electronics and Electrical Drives buchholz the field-oriented control in some operating conditions, e.g. in terms of torque dynamics or voltage utilization in the flux weakening region. Therefore, this paper's purpose is to demonstrate the potential

Paderborn, Universität

89

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

90

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

91

A Robust Torque Controller for Induction Motors Without Rotor Position Sensor: Analysis and Experimental Results  

E-print Network

is detailed in a recent book [1]. The operation of an induction motor as part of a `high performance drive and Experimental Results E.G.Strangas, H.K.Khalil, B. Al Oliwi, L. Laubinger Department of Electrical Engineering. Introduction High performance induction motor drives based on `Field Orientation' have been commercially

Strangas, Elias G.

92

Design and sensitivity analysis of a reduced-order rotor flux optimal observer for induction motor control  

Microsoft Academic Search

This paper aims to give simple and effective design criteria of rotor flux reduced-order observers for motion control systems with induction motors. While the observer is optimized for rotor and stator resistance variations, a sensitivity analysis is carried out in the presence of variations of all the motor parameters by means of either transfer function from true to observed rotor

Francesco Alonge; Filippo D’Ippolito

2007-01-01

93

Variable speed control of single and two phase induction motors using a three phase voltage source inverter  

Microsoft Academic Search

The authors propose a method for using a standard three-phase voltage source inverter to achieve wide-range variable-speed control of a single-phase induction motor, by connecting the main and auxiliary windings of the motor across the bridge as an unbalanced three-phase load. The motor is analyzed as an unbalanced two-phase system to determine the torque that can be expected under variable

D. G. Holmes; A. Kotsopoulos

1993-01-01

94

Inductance and Active Phase Vector Based Torque Control for Switched Reluctance Motor Drives.  

NASA Astrophysics Data System (ADS)

The Switched Reluctance Motor (SRM) drive technology has developed significantly over the last few years. The simplicity in both motor design and power converter requirement along with the availability of high frequency, high power semiconductor switches have made SRMs compete with conventional adjustable speed drive technologies. The subject of winding current control in switched reluctance machines has always been associated with the shaft position information. The use of inductance for direct commutation control is the central subject of this dissertation. In contrast to the conventional methods based on position commutation, new methods of control based on inductance commutation are presented. The object of a commutation algorithm is to switch the currents in the phase coils, in order to provide continuous energy conversion with maximum torque output for a given unit of input current. Since torque production in a SRM is based on the concept of variable reluctance, it makes more sense to observe the instantaneous phase inductance or reluctance instead of estimating the rotor position. The inductance sensors observe the machine parameters and provide sufficient information on the electrical characteristics of the coils. This control strategy avoids the inductance to position transformation blocks conventionally used in SRM control systems. In a typical SRM, the phase coils have a nonlinear behavior of inductance due to effects of current saturation. Also the parameters of one phase coil differ from those of the other due to manufacturing tolerances or due to bearing wear. In such cases, the algorithms written during the stage of manufacturing may not be valid after parameter changes. Optimizing torque production in the event of phase asymmetry and saturation is developed in this research. Indirect sensors connected to the active phase coil of the SRM are based on sensing the flux level in the active coil. New commutation algorithms based on flux sensing concepts are derived and commutation based on observable phase coil parameters are developed. The commutation methods are based on a composite vector of the observable parameters of the active phase coil. These methods work on a tabular approach which is ideal for implementation using digital computers.

Kalpathi, Ramani Raman

95

Temperature and Light Control of Three phase Induction Motor Speed Drive by PIC  

NASA Astrophysics Data System (ADS)

PIC is a family of Harvard architecture microcontrollers made by Microchip Technology, derived from the PIC1640 originally developed by General Instrument's Microelectronics Division. The name PIC initially referred to "Peripheral Interface Controller". PICs are popular with the developers and the hobbyists due to their low cost, wide availability, large user base, extensive collection of application notes, free development tools, and serial programming (and re-programming with flash memory) capability. In modern days, PIC microcontrollers are used in the industrial world to control many types of equipment, ranging from consumer to specialized devices. They have replaced older types of controllers, including microprocessors. Also, there is a growing need for off-line support of a computer's main processor. The demand is going to grow with more equipment uses more intelligence. In the engineering field for instance, PIC has brought a very positive impact in designing an automation control system and controlling industrial machineries. Accordingly, this paper shows the change in the motor speed by the use of PIC in accordance to the light and level of temperature. The project focuses on programming the PIC by embedded software that detects the temperature and light signals and send it to 3 phase induction motor of 240 volt. A theoretical analysis and the practical approach in achieving this work goal have proved that PIC plays an important role in the field of electronics control.

Barsoum, Nader

2010-06-01

96

A vector control scheme for EV induction motors with a series iron loss model  

Microsoft Academic Search

Electric vehicle (EV) motors are characterized by their low inductance and high current density, so that they run at high speed and produce a high starting torque. Due to the low inductance coil design, the current ripple caused by pulsewidth modulation (PWM) switching makes a significant amount of eddy-current loss and hysteresis loss, especially in high-speed operation. If one simply

Jinhwan Jung; Kwanghee Nam

1998-01-01

97

Efficiency optimization control of AC induction motors: Initial laboratory results. Final report, January 1992-September 1994  

SciTech Connect

A fuzzy logic, energy optimizing controller has been developed to improve the efficiency of motor/drive combinations which operate at varying load and speed conditions. The energy optimizer is complemented by a sensorless speed controller which maintains motor shaft revolutions per minute (RPM) to produce constant output power. Efficiency gains of from 1 to 20% are obtained from laboratory demonstration with commercial motors and drives. Motor shaft RPM is controlled to within 0.5%. The energy optimizing controller used for vector control adjustable speed drives is complemented by a torque pulsation control scheme to rapidly damp vibrations.

Turner, M.W.; McCormick, V.E.; Cleland, J.G.

1996-02-01

98

Dynamic Modeling and Simulation of an Induction Motor with Adaptive Backstepping Design of an Input-Output Feedback Linearization Controller in Series Hybrid Electric Vehicle  

Microsoft Academic Search

In this paper using adaptive backstepping approach an adaptive rotor flux observer which provides stator and rotor resistances estimation simultaneously for induction motor used in series hybrid electric vehicle is proposed. The controller of induction motor (IM) is designed based on input-output feedback linearization technique. Combining this controller with adaptive backstepping observer the system is robust against rotor and stator

Mehran Jalalifar; Amir Farrokh Payam; B. Mirzaeian; Saghaeian Nezhad

2006-01-01

99

Sensorless vector control of induction motors at very low speed using a nonlinear inverter model and parameter identification  

Microsoft Academic Search

The performance of vector-controlled induction motor drives without a speed sensor is generally poor at very low speed. The reasons are offset and drift components in the acquired feedback signals, voltage distortions caused by the nonlinear behavior of the switching converter, and the increased sensitivity against model parameter mismatch. New modeling and identification techniques are proposed to overcome these problems.

Joachim Holtz; Juntao Quan

2002-01-01

100

Sensorless vector control of induction motors at very low speed using a nonlinear inverter model and parameter identification  

Microsoft Academic Search

The performance of vector controlled induction motor drives without speed sensor is generally poor at very low speed. The reasons are offset and drift components in the acquired feedback signals, voltage distortions caused by the nonlinear behavior of the switching converter, and the increased sensitivity against model parameter mismatch. New modeling and identification techniques are proposed to overcome these problems.

Joachim Holtz; Juntao Quan

2001-01-01

101

Sensored Field Oriented Control of a Robust Induction Motor Drive Using a Novel Boundary Layer Fuzzy Controller  

PubMed Central

Physical sensors have a key role in implementation of real-time vector control for an induction motor (IM) drive. This paper presents a novel boundary layer fuzzy controller (NBLFC) based on the boundary layer approach for speed control of an indirect field-oriented control (IFOC) of an induction motor (IM) drive using physical sensors. The boundary layer approach leads to a trade-off between control performances and chattering elimination. For the NBLFC, a fuzzy system is used to adjust the boundary layer thickness to improve the tracking performance and eliminate the chattering problem under small uncertainties. Also, to eliminate the chattering under the possibility of large uncertainties, the integral filter is proposed inside the variable boundary layer. In addition, the stability of the system is analyzed through the Lyapunov stability theorem. The proposed NBLFC based IM drive is implemented in real-time using digital signal processor (DSP) board TI TMS320F28335. The experimental and simulation results show the effectiveness of the proposed NBLFC based IM drive at different operating conditions.

Saghafinia, Ali; Ping, Hew Wooi; Uddin, Mohammad Nasir

2013-01-01

102

Vector control strategies for single-phase induction motor drive systems  

Microsoft Academic Search

This paper discusses vector control strategies for single-phase motor drive systems operating with two windings. A model is proposed and used to derive control laws for single-phase motor drive systems. Such model is also employed to introduce the double-sequence controller. Simulation and experimental results are provided to illustrate the operation of the proposed drive systems.

M. B. de Rossiter Correa; C. B. Jacobina; E. R. C. da Silva; A. M. N. Lima

2004-01-01

103

Nonlinear adaptive state-feedback speed control of a voltage-fed induction motor with varying parameters  

Microsoft Academic Search

An adaptive nonlinear-state-feedback speed control scheme of a voltage-fed induction motor has been developed in which the control of torque and flux is decoupled. The inputs to the control algorithm are the reference speed, the reference flux, the measured stator currents, the measured rotor speed, the estimated rotor flux, and estimates of the rotor resistance, stator resistance, and load torque,

Mohamed Rashed; Peter F. A. MacConnell; A. Fraser Stronach

2006-01-01

104

Development of a novel wind turbine simulator for wind energy conversion systems using an inverter-controlled induction motor  

Microsoft Academic Search

A wind turbine simulator for wind energy conversion systems has been developed with a view to design, evaluate, and test of actual wind turbine drive trains including generators, transmissions, power-electronic converters and controllers. The simulator consists of a 10-hp induction motor (IM) which drives a generator and is driven by a 10-kW variable speed drive inverter and real-time control software.

Hossein Madadi Kojabadi; Liuchen Chang; Tobie Boutot

2004-01-01

105

A sensorless vector control system for induction motors using q-axis flux with stator resistance identification  

Microsoft Academic Search

This paper presents a sensorless vector control system for general-purpose induction motors, which is based on the observer theory and the adaptive control theories. The proposed system includes a rotor speed estimator using a q-axis flux and stator resistance identifier using the d-axis flux. The advantages of the proposed system are simplicity and avoidance of problems caused by using only

Mineo Tsuji; Shuo Chen; Katsuhiro Izumi; Eiji Yamada

2001-01-01

106

SPC-02-103/IEA-02-44 Performance Improvement of Direct Torque-Controlled Induction Motor  

E-print Network

SPC-02-103/IEA-02-44 * Performance Improvement of Direct Torque-Controlled Induction Motor in Low)dt · · · · · · · · · · · · · · · · (1) T = s × is · · · · · · · · · · · · · · · · · · · · · · · · (2) 1/6 #12;SPC-02-103/IEA-02-44 1 1 2* T 4 Fig. 4. Control of torque. Fig. 4 T 2 4 1 1 Fig. 5 2 3 6 n 2/6 #12;SPC-02-103/IEA-02-44 , , (1

Fujimoto, Hiroshi

107

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

108

Analytical model and feedback control of the levitation force for an induction-type bearingless motor  

Microsoft Academic Search

A relatively accurate analytical expression of the magnetic levitation force for an induction-type bearingless motor is proposed in this paper with the eccentricity in the location of stator and rotor taking into consideration, and its computation accuracy is verified by ANSOFT, an electro-magnetic field analysis software of electrical machines. Applying this analytical levitation force model, the real-time observation of magnetic

He Yikang; Nian Heng

2003-01-01

109

An adaptive supervisory sliding fuzzy cerebellar model articulation controller for sensorless vector-controlled induction motor drive systems.  

PubMed

This paper presents the implementation of an adaptive supervisory sliding fuzzy cerebellar model articulation controller (FCMAC) in the speed sensorless vector control of an induction motor (IM) drive system. The proposed adaptive supervisory sliding FCMAC comprised a supervisory controller, integral sliding surface, and an adaptive FCMAC. The integral sliding surface was employed to eliminate steady-state errors and enhance the responsiveness of the system. The adaptive FCMAC incorporated an FCMAC with a compensating controller to perform a desired control action. The proposed controller was derived using the Lyapunov approach, which guarantees learning-error convergence. The implementation of three intelligent control schemes-the adaptive supervisory sliding FCMAC, adaptive sliding FCMAC, and adaptive sliding CMAC-were experimentally investigated under various conditions in a realistic sensorless vector-controlled IM drive system. The root mean square error (RMSE) was used as a performance index to evaluate the experimental results of each control scheme. The analysis results indicated that the proposed adaptive supervisory sliding FCMAC substantially improved the system performance compared with the other control schemes. PMID:25815450

Wang, Shun-Yuan; Tseng, Chwan-Lu; Lin, Shou-Chuang; Chiu, Chun-Jung; Chou, Jen-Hsiang

2015-01-01

110

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

111

Pulse multiplication in AC-DC converters for harmonic mitigation in vector-controlled induction motor drives  

Microsoft Academic Search

In this paper, an autotransformer with reduced kilovoltampere rating for 24-pulse ac-dc converter fed vector controlled induction motor drives (VCIMDs) is presented for harmonic current reduction. The 24-pulse operation is achieved using dc ripple reinjection technique in 12-pulse ac-dc converters. The proposed novel harmonic mitigator is found capable of suppressing up to 21st harmonic in the supply current. The procedure

Bhim Singh; G. Bhuvaneswari; Vipin Garg; Sanjay Gairola

2006-01-01

112

Motor Controller  

NASA Technical Reports Server (NTRS)

M.H. Marks Enterprises' Power Factor Controller (PFC) matches voltage with motor's actual need. Plugged into a motor, PFC continuously determines motor load by sensing shifts between voltage and current flow. When it senses a light load, it cuts voltage to the minimum needed. It offers potential energy savings ranging from eight percent up to 65 percent depending on the application. Myles Marks started out with the notion of writing an article for Popular Electronics magazine at the same time offering to furnish kits to readers interested in assembling PFC's. Within two weeks from publication he had orders for 500 kits and orders are still coming three years later.

1988-01-01

113

Sliding-mode control of a six-phase series/parallel connected two induction motors drive.  

PubMed

In this paper, a parallel configuration is proposed for two quasi six-phase induction motors (QIMs) to feed them from a single six-phase voltage source inverter (VSI). A direct torque control (DTC) based on input-output feedback linearization (IOFL) combined with sliding mode (SM) control is used for each QIM in stationary reference frame. In addition, an adaptive scheme is employed to solve the motor resistances mismatching problem. The effectiveness and capability of the proposed method are shown by practical results obtained for two QIMs in series/parallel connections supplied from a single VSI. The decoupling control of QIMs and the feasibility of their torque and flux control are investigated. Moreover, a complete comparison between series and parallel connections of two QIMs is given. PMID:25264286

Abjadi, Navid R

2014-11-01

114

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.

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

1996-01-01

115

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

116

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

117

Reducing Acoustic Noise Radiated by Inverter-Fed Induction Motors Controlled by a New PWM Strategy  

Microsoft Academic Search

This paper presents a new application of a control strategy to reduce the acoustic noise caused by pulsewidth-modulation (PWM)-controlled induction machine drives. The proposed strategy is based on a frequency modulation of the triangular carrier through a sinusoidal signal. It is used to decrease the acoustic noise and to achieve a reduction in the total harmonic distortion. The main advantage

A. Ruiz-Gonzalez; M. J. Meco-Gutierrez; F. Perez-Hidalgo; F. Vargas-Merino; J. R. Heredia-Larrubia

2010-01-01

118

Sensorless performance evaluation of induction motors  

E-print Network

. 1 Introduction The induction motor, since its invention by Nikola Tesla in 1886 has reserved a prominent position in the clcctromechanical energy conversion industry. Induction motors account for approximately 70% of the electromechanical energy...

Ahmed, Shehab

2000-01-01

119

Direct Torque Control with Full Order Stator Flux Observer for Dual-Three Phase Induction Motor Drives  

NASA Astrophysics Data System (ADS)

A Direct Torque Control (DTC) strategy for dual-three phase induction motor drives is discussed in this paper. The induction machine has two sets of stator three-phase windings spatially shifted by 30 electrical degrees with isolated neutral points. The proposed control strategy is based on Proportional Integral (PI) regulators implemented in the stator flux synchronous reference frame. To improve the flux estimation, an Adaptive Stator Flux Observer (ASFO) has been used. Doing so, besides a better flux estimation in contrast to open-loop flux estimators, it is possible to use the observed currents to compensate the inverter non-linear behavior (such as dead-time effects), improving the drive performance at low speed. This is particularly important for low voltage/high current applications, as the drive considered in this paper. The advantages of the discussed control strategy are: constant inverter switching frequency, good transient and steady-state performance and less distorted machine currents in contrast to DTC schemes with variable switching frequency. Experimental results are presented for a 10kW dual three-phase induction motor drive prototype.

Farina, Francesco; Bojoi, Radu; Tenconi, Alberto; Profumo, Francesco

120

Design of an advanced non linear controller for induction motors and experimental validation on an industrial benchmark  

NASA Astrophysics Data System (ADS)

This paper mainly deals with the design of an advanced control law for induction motors and its real-time implementation on an experimental test benchmark. First, relationship between the classical field oriented control (FOC) and non linear linearizing control laws is studied. It is shown that both control laws are similar. Classical non linear linearizing control improves the performances but not in a spectacular way when the observer and the controller are designed independently. A new non linear observer based control law is designed, which is shown to be globally stable and is implemented on an experimental test-bench. The control algorithm is studied and applied in many configurations (various set-points, flux and speed profiles and torque disturbances) and is shown to be very efficient.

Lubineau, D.; Dion, J. M.; Dugard, L.; Roye, D.

2000-02-01

121

Symmetrical GTO current source inverter for wide speed range control of 2300 to 4160 volt, 350 to 7000 HP, induction motors  

Microsoft Academic Search

A line of variable-speed 2300-4160 V, 350-7000 hp induction-motor drives for either fan or constant torque load applications is described. The drives are current-sourced, consisting of one or two six-pulse thyristor phase-controlled source converters in series, a DC link reactor, a six-pulse, symmetric-GTO (gate-turn-off), load inverter, a three-phase load capacitor in parallel with the induction motor. The drive features a

Paul M. Espelage; James M. Nowak; Loren H. Walker

1988-01-01

122

Harmonic Electromagnetic Forces in Induction Motors  

Microsoft Academic Search

Recently, there has been increasing demand for quiet motors, and the same trend has been observed in the case of induction motors. In induction motors, electromagnetic noise is sometimes the predominant acoustic noise. In small motors, the major cause of vibration and noise is electromagnetic forces resulting from the combination of harmonic fluxes in the air gap. In this study,

Fuminori Ishibashi; Makoto Matsushita; Shinichi Noda

2009-01-01

123

Motor Controllers  

NASA Astrophysics Data System (ADS)

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

124

Adaptive full order observer based stable speed sensorless scheme for vector controlled induction motor drives  

Microsoft Academic Search

The full-order Luenberger flux observer (FOLO) combined with adaptive techniques is the most widely used method for sensorless induction machine (IM) vector controlled drives. However, IM model-based sensorless schemes have an inherently unstable region under regenerating conditions. Additionally, the stator resistance is also required at low speeds, which leads to a complicated multiple-input multiple-output (MIMO) system. In this paper, the

Iban Vicente; Aitor Endemaño; Xabier Garin; Martin Brown

2009-01-01

125

Power electronics and motor control  

Microsoft Academic Search

Offering an introduction to power electronics, this text considers the topics of analogue electronics, electric motor control, and adjustable speed electrical drives, both a.c. and d.c. Up-to-date in its coverage of this rapidly developing field, the book examines such topics as controlled bridge rectifiers and speed control of induction motors by variable voltage-variable frequency inverters.

W. Shepherd; L. N. Hulley

1987-01-01

126

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

127

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

128

Induction Motors Bearing Failures Detection and Diagnosis  

E-print Network

winding. However, motors driven by solid-state inverters undergo severe voltage stresses due to rapid331 1 Induction Motors Bearing Failures Detection and Diagnosis Using a RBF ANN Park Pattern Based failure detection and diagnosis in induction motors. The proposed approach is a sensor-based technique

Boyer, Edmond

129

Fuzzy efficiency optimization of AC induction motors  

NASA Technical Reports Server (NTRS)

This paper describes the early states of work to implement a fuzzy logic controller to optimize the efficiency of AC induction motor/adjustable speed drive (ASD) systems running at less than optimal speed and torque conditions. In this paper, the process by which the membership functions of the controller were tuned is discussed and a controller which operates on frequency as well as voltage is proposed. The membership functions for this dual-variable controller are sketched. Additional topics include an approach for fuzzy logic to motor current control which can be used with vector-controlled drives. Incorporation of a fuzzy controller as an application-specific integrated circuit (ASIC) microchip is planned.

Jani, Yashvant; Sousa, Gilberto; Turner, Wayne; Spiegel, Ron; Chappell, Jeff

1993-01-01

130

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

131

Type-1 and Type-2 Fuzzy Logic and Sliding-Mode Based Speed Control of Direct Torque and Flux Control Induction Motor Drives - A Comparative Study  

NASA Astrophysics Data System (ADS)

In this research study, the performance of direct torque and flux control induction motor drive (IMD) is presented using five different speed control techniques. The performance of IMD mainly depends on the design of speed controller. The PI speed controller requires precise mathematical model, continuous and appropriate gain values. Therefore, adaptive control based speed controller is desirable to achieve high-performance drive. The sliding-mode speed controller (SMSC) is developed to achieve continuous control of motor speed and torque. Furthermore, the type-1 fuzzy logic speed controller (T1FLSC), type-1 fuzzy SMSC and a new type-2 fuzzy logic speed controller are designed to obtain high performance, dynamic tracking behaviour, speed accuracy and also robustness to parameter variations. The performance of each control technique has been tested for its robustness to parameter uncertainties and load disturbances. The detailed comparison of different control schemes are carried out in a MATALB/Simulink environment at different speed operating conditions, such as, forward and reversal motoring under no-load, load and sudden change in speed.

Ramesh, Tejavathu; Panda, A. K.; Kumar, S. Shiva

2013-08-01

132

A stator-flux-based vector control method for parallel-connected multiple induction motors fed by a single inverter  

Microsoft Academic Search

This paper presents a novel vector control method for a parallel-connected multiple motor drive system. The proposed control method is based on the stator-flux, and is capable of accurate and responsive torque control even if there are the rotor velocity differences among the motors. To confirm the validity of the proposed control method, the authors compare a simulation result of

Y. Matsumoto; C. Osawa; T. Mizukami; S. Ozaki

1998-01-01

133

Indices to detect Hopf bifurcation in Induction motor drives  

E-print Network

The loss of stability of induction motor controlled by Indirect Field Oriented Control (IFOC) is a matter of great concern of operators and design engineers. This paper reports indices to detect and predict stability problem such as system oscillations. Oscillations as a result of loss of stability, due to Hopf bifurcation, for different parameter values of IFOC motor are studied using the proposed indices.

Krishnendu Chakrabarty; Urmila Kar

2014-10-24

134

Decoupled-control method of normal and thrust forces in linear induction motor for Maglev vehicle Marine-Express ME01  

Microsoft Academic Search

This paper proposes a decoupled-control method of normal and thrust forces in linear induction motors (LIM). By using this method, the normal force can be used to levitate and the thrust force to propel a vehicle without the force-couple of LIM, allowing the realization of a compact combined levitation-and-propulsion system with LIM only

K. Yoshida; L. Shi; T. Yoshida

1999-01-01

135

An Effective Control Technique for Medium-Voltage High-Power Induction Motor Fed by Cascaded Neutral-Point-Clamped Inverter  

Microsoft Academic Search

For a cascaded neutral-point-clamped (NPC) inverter applied to the medium-voltage high-power induction-motor (IM) drives, an effective control technique is proposed in this paper. The novel sinusoidal pulsewidth modulation (PWM) pulse-rotation-control approach, for a wide range of output voltage, provides a simple way to implement vector control for IM when the cascaded NPC inverter is employed. The proposed method presents great

Baoming Ge; Fang Zheng Peng; Aníbal T. de Almeida; Haitham Abu-Rub

2010-01-01

136

Transistorized PWM inverter-induction motor drive system  

NASA Technical Reports Server (NTRS)

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.

1982-01-01

137

ICAD current controller assessment under FOC motor control schemes  

Microsoft Academic Search

In this paper a previously presented ICAD induction motor current controller is tested under various vector oriented control scheme, including two of the most used induction motor control schemes. A brief description of vector oriented control schemes is given together with an explanation of how this schemes interact and are beneficed by using the ICAD current controller. Moreover, this can

Jesús Liceaga-Castro; Luis Amezquita-Brooks; E. Liceaga-Castro

2007-01-01

138

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

139

Voltage-induction type electrostatic film motor driven by two- to four-phase ac voltage and electrostatic induction  

Microsoft Academic Search

This paper describes a voltage-induction type electrostatic film motor that operates by feeding electric power to the slider by electrostatic induction. In the electrostatic motor, applying voltages to both of its stator and slider contributes to its fine positioning resolution and better controllability. However, in some cases such as relatively small motors, the electric wires connected to the slider could

Norio Yamashita; Zu Guang Zhang; Akio Yamamoto; Masahiko Gondo; Toshiro Higuchi

2007-01-01

140

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

141

Improved direct torque and flux vector control of PWM inverter-fed induction motor drives  

Microsoft Academic Search

In this paper, a direct torque and stator flux vector control system is presented. The principle of this method was proposed by Takahashi and Noguchi in 1985. In contrast to the field oriented control, no coordinate transformation and current control loop is required. In practical application, however, problems occur with starting and operation in the zero speed region. This paper

Marian P. Kazmierkowski; Andrzej B. Kasprowicz

1995-01-01

142

FPGA implementation of Induction Motor Vector Control using Xilinx System Generator  

Microsoft Academic Search

Mechatronic systems are complex interdisciplinary products where many parts are present that overlap each other; electronic control board, electromechanical machines, and power drives. With FPGAs, their control can run faster as multiple operations are executed in parallel. A simulation tool that facilitates the direct translation into hardware of mechatronic control algorithms is desirable. The Xilinx System Generator (XSG), a high-level

Jean-Gabriel Mailloux; Stéphane Simard; Rachid Beguenane

143

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

E-print Network

been the field oriented control (FOC) proposed by Blaschke [1]. This technique is very useful except that it is very sensitive to parameters variation. To improve FOC, several techniques have been proposed mode control, predictive control [2-4]. Even though, these techniques bring improvements to FOC

Paris-Sud XI, Université de

144

Online condition monitoring of induction motors  

Microsoft Academic Search

Condition monitoring of induction motors is a process that may be used to great advantage in mining and other industrial applications. The early detection of motor winding deterioration prior to a complete failure provides an opportunity for maintenance to be performed on a scheduled routine without the loss of production time. Presented in this paper is a theoretical and experimental

Frederick C. Trutt; Joseph Sottile; Jeffery L. Kohler

2002-01-01

145

12Sector Methodology of Torque Ripple Reduction in a Direct Torque Controlled Induction Motor Drive  

Microsoft Academic Search

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. 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 stator flux linkages. This

Borra Suresh Kumar; R. A. Gupta; Rajesh Kumar

2006-01-01

146

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

147

A Ripple Minimization Strategy for Direct Torque and Flux Control of Induction Motors using Sliding Modes  

E-print Network

main commercial implementation approaches, Field Oriented Control (FOC) and Direct Flux and Torque.g., Le-Huy, 1995, Vas, 1998]. On one hand, FOC appears as having a better performance than DTFC in a wide range of speed and load conditions. However, the per- formance of a FOC implementation critically

Braslavsky, Julio H.

148

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

149

A step-down chopper-controlled slip energy recovery induction motor drive  

SciTech Connect

The design of a chopper-controlled slip energy recovery drive (SERIMD), also known as a static Kramer drive, demands an exact knowledge of the steady state and dynamic performance of the system over the complete operating range. To accomplish this, a coupled circuit approach is necessary whereby the self and mutual coupling effects, voltage and current harmonics in the machine and voltage and current ripple at different points in the drive system are duly taken into account. Such a model should enable the accurate prediction of all instantaneous current values which leads to accurate prediction of electric torque and harmonics injected into the supply. This paper presents a model to accomplish the above. Mathematical predictions are verified with detailed experimental results.

Refoufi, L. (Inst. National D'Electricite et D'Electronique, Boumerdes (Algeria)); Pillay, P. (Univ. of New Orleans, LA (United States). Dept. of Electrical Engineering); Harris, M.R. (Univ. of Southampton, England (United Kingdom). Dept. of Electrical Engineering)

1993-09-01

150

Stepping Motor Control System  

E-print Network

This paper describes a hardware system designed to facilitate position and velocity control of a group of eight stepping motors using a PDP-11. The system includes motor driver cards and other interface cards in addition ...

Larson, Noble G.

151

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

152

Switching strategy based on homotopy continuation for non-regular affine systems with application in induction motor control  

E-print Network

In the article the problem of output setpoint tracking for affine non-linear system is considered. Presented approach combines state feedback linearization and homotopy numerical continuation in subspaces of phase space where feedback linearization fails. The method of numerical parameter continuation for solving systems of nonlinear equations is generalized to control affine non-linear dynamical systems. The illustrative example of control of MIMO system which is not static feedback linearizable is given. Application of proposed method demonstrated on the speed and rotor magnetic flux control in the three-phase asynchronous motor.

Borisevich, Alex

2012-01-01

153

Linear induction motor parameter determination on force development applications  

Microsoft Academic Search

The main goal in this paper is to present a linear induction motor parameter determination method when its destination is mainly the thrust development. This method is developed basically from the equivalence between the linear induction motor (LIM) and the ordinary asymmetrical induction motor. In this case the theory of symmetrical and asymmetrical components or positive, negative and zero sequence

Luciano Martins Neto; Euler B. dos Santos; J. R. Camacho

2000-01-01

154

A linear induction motor conveyer  

E-print Network

long. Despite som other had a rotor mi e o L3 difficulties involving the electropult, the prototypes were capable of accelerating aircraft from rest to a speed of 115 miles per hour in 4. 2 secords. The elec- tropult system was finally abandoned... can be obtained without any increase in power consumption. The reason for us- ing a laminated core is to cut down on eddy currents. laminated iron core Pigure 24. A 2, :lot, /po' o(pb 'se J inear motor stator. (Eddy currents are random currents...

Solinsky, Kenneth Sheldon

1973-01-01

155

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

156

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

157

Input power minimization at inverter fed induction motor drive system with FOC by field weakening  

Microsoft Academic Search

In cases where power resources are limited, the power consumption of an induction motor drive system is an essential question. With minimization of the size of the current's vectors in field-oriented control (FOC) of the induction motor, minimization of input power can be achieved. In the present paper, the minimization problem and procedure is shown and power savings are compared

Zarko CUCEJ; DuSan BOROJEVIC

1997-01-01

158

Characteristics of forces of Linear Induction Motor driven by power source including frequency component synchronous with the motor speed  

Microsoft Academic Search

We have proposed the linear induction motor (LIM) is driven by the power source including different frequency components to control the attractive force and thrust force. In this paper, we propose the frequency component synchronous with the motor speed is used as one of the components. It achieves the easy control of the forces because the component synchronous with the

Kaoru Iwaki; Toshimitsu Morizane; Noriyuki Kimura; Katsunori Taniguchi

2009-01-01

159

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

160

A general scheme for induction motor condition monitoring  

Microsoft Academic Search

This work proposes a general scheme to detect induction motor faults by monitoring the motor current. The scheme is based on signal processing (predictive filters), soft computing techniques (fuzzy logic), the analytical studies of induction motor under fault conditions and the analysis of data generated by finite element method (FEM). The predictive filter is used in order to separate the

P. Vicente; J. Rodriguez; M. Negrea; A. Arkkio

2005-01-01

161

Three-phase induction motor dynamic mathematical model  

Microsoft Academic Search

The induction motor dynamic model, frequently used in motor dynamic studies, is constituted by four voltage differential equations and one mechanical differential equation being well known among the electrical machine researchers. The main goal of this paper is to present a more comprehensive three-phase induction motor dynamic mathematical model including the skin effect, the temperature influence on the parameters and

Emesto Ruppert Filho; R. M. de Souza

1997-01-01

162

Neural speed filtering for sensorless induction motor drives  

Microsoft Academic Search

Effective sensorless dynamic speed estimation is desirable for both speed sensorless motor-drive applications and for on-line induction motor condition monitoring and assessment. In this paper, a sensorless neural adaptive speed filter is developed for induction motors running off a voltage source inverter. The filter is demonstrated by comparisons with experimental speed measurements and spectral speed estimates. In addition to nameplate

Raj M. Bharadwaj; Alexander G. Parlos; Hamid A. Toliyat

2004-01-01

163

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

164

In Proc. of the 1998 IFAC Workshop on Adaptive Control and Signal Processing, Glasgow, Scotland. 1 SUPERVISORY FIELD--ORIENTED CONTROL OF INDUCTION MOTORS  

E-print Network

: It is well known that the performance of the (industry standard) field--oriented control (FOC) for induction the supervisory control ideas of Morse to obtain an adaptive implementation of FOC for current--fed machines control designs. The supervisor selects from these sets the value to be applied to the FOC, a choice

Hespanha, João Pedro

165

Performance comparison of DTC and FOC induction motor drive in five level diode clamped inverter  

Microsoft Academic Search

Robustness, fast dynamic response and simplicity of direct torque control and field oriented control methods of induction motor can successfully replace dc motors. The development in multilevel inverter topologies and their control techniques made has improved the performance of these drives to the industrial requirements. The performances of these drives with diode-clamped multilevel inverter are compared and the results presented

U. V Patil; H. M. Suryawanshi; M. M. Renge

2012-01-01

166

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

167

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, Poincaré 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; Ünnü, Sezen Y?d?r?m; ?eker, Serhat

2012-09-01

168

PVDF based vibration measurements and their correlation with torque estimation in a FOC induction motor drive  

Microsoft Academic Search

This paper presents a study concerning the vibrations generated by an induction motor drive controlled by field oriented control algorithm (FOC). The aim of the study is to identify suitable measurement points and analysis techniques in order to achieve information about vibration generated by an electric drive. Vibrations take origin both by the torque generated by the motor and the

Leonardo D'Acquisto; Giuseppe Abbate; Marcello Pucci; G. Vitale; M. Kesri

2008-01-01

169

Robust multivariate control charts for early detection of broken rotor bars in an induction motors fed by a voltage source inverter  

Microsoft Academic Search

In this paper, we present a work in progress about the development of an expert system to detect incipient faults related to asymmetries in the rotor cage in induction motors fed by Voltage Source Inverters. The expert system is based on a condition monitoring technique based on robust statistical tools, and it makes use of the Fast Fourier Transform to

Luis A. Garcia-Escudero; Oscar Duque-Perez; Daniel Morinigo-Sotelo; Marcelo Perez-Alonso

2011-01-01

170

An Integrated System of Wound Rotor Induction Motor Soft Starting and Doubly-fed Speed Adjusting  

Microsoft Academic Search

An integrated system of wound rotor induction motor soft starting and doubly-fed speed adjusting was proposed. It consists of variable reactance converter, electronic power inverter, controller and wound rotor induction motor. The hardware design of the integrated system was illustrated in detail. When soft starting, variable reactor technique was adopted. While doubly-fed speed adjusting, double closed-loop controlling was applied to

Xiao Yi-ping; Yuan You-xin

2010-01-01

171

Fault diagnosis of induction motors with dynamical neural networks  

Microsoft Academic Search

The paper studies the fault diagnosis of induction motors using neural network time-series models. The problem has been widely discussed in the literature and neural networks have been used in the fault diagnosis of induction motors. However, the neural network models have been mostly static - dynamical neural networks have been overlooked and have not received enough attention in this

Jarmo Lehtoranta; Heikki N. Koivo

2005-01-01

172

Induction motor condition monitoring using industrial wireless sensor networks  

Microsoft Academic Search

An induction motor condition monitoring system using industrial wireless sensor networks (IWSNs) with and without on-sensor data processing are described and compared. The prototype system has been implemented and validated on a single phase induction motor in the laboratory. On-sensor data processing is explored to alleviate the contradictions between the higher performance requirements of IWSNs such as higher sample rate

Liqun Hou; Neil W Bergmann

2010-01-01

173

High-speed induction motor development for small centrifugal compressor  

Microsoft Academic Search

This paper describes a brief overview of problems and features related to the electromagnetic and mechanical design and construction of a high-speed induction motor to drive a centrifugal compressor in commercial HVAC system. The prototype 15 HP at 56500 RPM induction motor was manufactured and successfully tested in the compressor test equipment

Young-Kwan Kim; Moon-Chang Choi; Kwang-Ha Suh; Yu-Chul Ji; Dae-Sung Wang

2001-01-01

174

Voltage multiscalar control of induction machine supplied by current source converter  

Microsoft Academic Search

Control systems for the induction motor fed by current source converter based on a multiscalar models are presented in this paper. The topology of current source inverter is shown. Equations of multiscalar model of the induction motor are derived. The multiscalar model is the new approach to the control of induction motor based on DC-link current and rotor flux vector.

Marcin Morawiec; Zbigniew Krzeminski; Arkadiusz Lewicki

2010-01-01

175

Induction motors, reciprocating compressors and variable frequency drives  

Microsoft Academic Search

The use of variable frequency drives (VFD) is becoming popular with induction motor driven reciprocating gas compressors. Reciprocating compressors, being rich sources of torque pulsation frequencies, too often create motor component reliability issues. The problem is compounded when variable speed is introduced because of the difficulty in avoiding resonance. This paper reviews key torsional vibration concepts and common motor failure

M. Perrin; G. Kohn; S. Mugford; G. Seggewiss

1997-01-01

176

A simplified scheme for induction motor condition monitoring  

Microsoft Academic Search

This work proposes a general scheme to detect induction motor fault by monitoring the motor current. The scheme is based on signal processing (predictive filters) and soft computing technique (fuzzy logic). The predictive filter is used in order to separate the fundamental component from the harmonic components. Fuzzy logic is used to identify the motor state. Finite element method (FEM)

Pedro Vicente Jover Rodríguez; Marian Negrea; Antero Arkkio

2008-01-01

177

A study of state variable participation in limit-cycle of induction motor  

E-print Network

The paper presents bifurcation behavior of a single phase induction motor. This paper also attempts to discuss the bifurcation behavior of the system based on the evolution of different state variables. The bifurcation diagrams drawn looking at different state variables are different in terms of periodicity and route to chaos. The knowledge of the dynamics of the system obtained from bifurcation diagrams give useful guidelines to control the operation of the induction motor depending on the need of an application for better performance.

Krishnendu Chakrabarty; Urmila Kar

2014-10-24

178

Modelling and Analysis of Dual-Stator Induction Motors  

NASA Astrophysics Data System (ADS)

In this paper, the analysis and the modelling of a Dual-Stator Induction Motor (DSIM) are presented. In particular, the effects of the shift angle between its three-phase windings are studied. A complex steady state model is first established in order to analyse its harmonic behavior when it is supplied by a non-sinusoidal voltage source. Then, a new transformation matrix is proposed to develop a suitable dynamic model. In both cases, the study is made using an arbitrary shift angle. Simulation results of its PWM control are also presented and compared in order to confirm our theoretical observations.

Razik, Hubert; Rezzoug, Abderrezak; Hadiouche, Djafar

179

Fuzzy optimization for rotor constant identification of an indirect FOC induction motor drive  

Microsoft Academic Search

The adaptive field-oriented control of an induction motor drive using fuzzy logic for the identification of the rotor time constant is proposed. The identification is presented as an optimization problem and the objective function is the total square error between the motor and commanded stator currents. Experimental results are presented

Edson Bim

2001-01-01

180

The Equivalent T Circuit of the Induction Motor: Its Nonuniqueness and Use to the Magnetic Field Analyst  

Microsoft Academic Search

The equivalent T circuit of an induction motor is found in every engineering motors book and is becoming increasingly important with the popularity of vector control. The values used in the circuit are used to dictate the necessary gating signals for the pwm inverter. It is the de facto standard bridge between the field analyst and the motor controller. These

Kent R. Davey

2007-01-01

181

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. Šaj? 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 paaugstinoš? p?rveidot?ja un slodzes, tika p?rbaud?ts gan simul?šanas 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

182

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

183

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

E-print Network

, the overall design consists of two distinct steps. In the first step (Fault Detection and Isolation: FDI), a dynamical system (FDI block) is de- signed. By processing input/output data, the FDI block is able to detect (control reconfiguration step), the control law is changed according to the information provided by the FDI

Boyer, Edmond

184

Design Consideration of an Integrated Induction Motor Drive to Replace Auxillary DC Motors in Locomotives  

Microsoft Academic Search

An application requirement from Indian Railways, one of the largest railways in the world, was replacement of 72 V DC small motors in diesel locomotives with squirrel cage induction motor integrated with 3-phase PWM sinewave compact inverter. The motors\\/inverters were to be mounted inside the locomotives adjacent to the engine (fuel pump, crank case exhauster etc) or in open air

Partha Sarathi Biswas; Nabendu Das; Sujit K. Biswas

2005-01-01

185

Efficiency Optimization of Slitted-Core Induction Motor  

NASA Astrophysics Data System (ADS)

In this study, a 3kW squirrel cage induction motor having slits in stator and rotor teeth were examined. The slit depth and width in the 56 different slitted motor models were optimized with Finite Element Method Magnetics (FEMM) software by using Finite Elements Method (FEM). What value the depth and width of optimum slit should be was determined in order to obtain maximum motor efficiency in the new motor models created with the proposed slitted structure, and how the depth and width of slit could affect the performance of motor was demonstrated.

Yetgin, Asim Gökhan; Turan, Mustafa

2014-01-01

186

Impact of PWM Schemes on Induction Motor Losses  

Microsoft Academic Search

This paper presents the results of an investigation into the impact of pulse width modulation (PWM) switching schemes on power losses in induction motors and their inverter drives. The PWM schemes considered include sinusoidal PWM, space-vector PWM and discontinuous PWM. Both experimental results and simulated predictions are presented for fractional horsepower and small integral horsepower motors. Direct loss measurements have

Y. Wu; R. A. McMahon; Y. Zhan; A. M. Knight

2006-01-01

187

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

188

On-line condition monitoring of induction motors  

Microsoft Academic Search

Condition monitoring of induction motors is a process that may be used to great advantage in mining and other industrial applications. The early detection of motor winding deterioration prior to a complete failure provides an opportunity for maintenance to be performed on a scheduled routine without the loss of production time. Presented in this paper is a theoretical and experimental

F. C. Trutt; J. Sottile; J. L. Kohler

2001-01-01

189

Mathematical modelling of electromagnetic forces in Linear Induction Motors  

Microsoft Academic Search

Definition of electromagnetic forces is an important stage in analysis of dynamic and static modes of linear induction motors (LIM). The report contains the mathematical model of calculation of these forces taking into account end effects and asymmetry of phase currents under different modes of LIMs. The model is characterized by decomposition of LIM into elementary motors for which the

Fuad M. Nabiyev

2008-01-01

190

Six-Phase Voltage Source Inverter Driven Induction Motor  

Microsoft Academic Search

A six-phase six-step voltage-fed induction motor is presented. The inverter is a transistorized six-step voltage source inverter, while the motor is a modified standard three-phase squirrel-cage motor. The stator is rewound with two three-phase winding sets displaced from each other by 30 electrical degrees. A model for the system is developed to simulate the drive and predict its performance. The

Mohamed A. Abbas; Roland Christen; Thomas M. Jahns

1984-01-01

191

Advanced Induction Motor Endring Design Features for High Speed Applications  

Microsoft Academic Search

This paper presents advancements in induction motor endring design to overcome mechanical limitations and extend the operating speed range and joint reliability of induction machines. A novel endring design met the challenging mechanical requirements of this high speed, high temperature, power dense application, without compromising electrical performance. Analysis is presented of the advanced endring design features including a non uniform

Matthew Caprio; Vasileios Lelos; John Herbst; Jim Upshaw

2005-01-01

192

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

193

Neural network mapping of hybrid FOC-DTC induction motor drive  

Microsoft Academic Search

This paper presents the mapping of a hybrid of two most popular control strategies for induction motor drive: field oriented control (FOC) and direct torque control (DTC), with the multilayer feedforward neural network. One neural network is used to map FOC scheme and another network is used to map DTC scheme. The training is made separately with the input-output data

P. Sakarung; S. Chatratana

2004-01-01

194

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

195

Improved SCR ac-motor controller for battery-powered urban electric vehicles  

Microsoft Academic Search

An electric vehicle propulsion system controller which uses an ac induction electric motor as the electrical to mechanical energy conversion unit was designed and developed. The contract program was to design and test 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

Latos

1982-01-01

196

MATE Module 10: Control Systems: Motor Control  

NSDL National Science Digital Library

This module from the Marine Advanced Technology Education Center introduces students to basic Brushed DC motor concepts. Students will learn to describe the methods of speed control for a Brushed DC motor, calculate the necessary PWM duty cycle needed for specific motor voltages, describe the operation of motor control H-Bridges and describe the danger relating to improper control of the H-Bridge. A PowerPoint presentation of the lecture material is available for download.

197

An On-line Distributed Induction Motor Monitoring System Based-on ARM and CAN Bus  

Microsoft Academic Search

This paper presents an on-line distributed induction motor monitoring system based-on the ARM (Advanced RISC Machines), which is integrated with the embedded and CAN (Controller Area Network) bus technologies. The hardware structure of the system with the ARM microprocessor S3C2410X and CAN bus controller MCP2510 is introduced; the accomplishment of software of motor on-line monitoring system is also described. Compared

Chenhui Wang; Yukun Liu; Liwei Guo; Yong Yue; Carsten Maple

2011-01-01

198

Analytical and experimental study of high phase order induction motors  

NASA Technical Reports Server (NTRS)

Induction motors having more than three phases were investigated to determine their suitability for electric vehicle applications. The objective was to have a motor with a current rating lower than that of a three-phase motor. The name chosen for these is high phase order (HPO) motors. Motors having six phases and nine phases were given the most attention. It was found that HPO motors are quite suitable for electric vehicles, and for many other applications as well. They have characteristics which are as good as or better than three-phase motors for practically all applications where polyphase induction motors are appropriate. Some of the analysis methods are presented, and several of the equivalent circuits which facilitate the determination of harmonic currents and losses, or currents with unbalanced sources, are included. The sometimes large stator currents due to harmonics in the source voltages are pointed out. Filters which can limit these currents were developed. An analysis and description of these filters is included. Experimental results which confirm and illustrate much of the theory are also included. These include locked rotor test results and full-load performance with an open phase. Also shown are oscillograms which display the reduction in harmonic currents when a filter is used with the experimental motor supplied by a non-sinusoidal source.

Klingshirn, Eugene A.

1989-01-01

199

Fault Detection of Broken Rotor Bars in Induction Motor using a Global Fault Index  

E-print Network

Modulation Index, Global Fault Index. 1 Introduction Induction motors, especially the asynchronous motorsFault Detection of Broken Rotor Bars in Induction Motor using a Global Fault Index G. Didier , E. Ternisien , O. Caspary , and H. Razik Abstract Induction motors play a very important part in the safe

Boyer, Edmond

200

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

201

Visualization and Animation of Inverter-Driven Induction Motor A. P. Sakis Meliopoulos, W. Gao  

E-print Network

1 Visualization and Animation of Inverter-Driven Induction Motor Operation A. P. Sakis Meliopoulos induction motor that enables direct animation and visualization of the inverter and motor operation. As such they enable direct animation and visualization of the operation of the inverter- driven induction motor

202

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

203

A fuzzy-logic-based multimodel field orientation in an indirect FOC of an induction motor  

Microsoft Academic Search

Classical indirect field-oriented control is highly sensitive to uncertainties in the rotor resistance of the induction motor. This sensitivity can be reduced by combining two different methods to compute the stator electrical frequency. Fuzzy logic is used to combine both methods to obtain a compromise which reduces the flux control sensitivity to electrical parameter errors at each operating point. The

Benoît Robyns; Frédérique Berthereau; Jean-Paul Hautier; Hervé Buyse

2000-01-01

204

Fault Indicators for the Diagnosis of Rotor Faults in FOC Induction Motor Drives  

Microsoft Academic Search

In this paper, different diagnostic techniques are proposed for the diagnosis of rotor faults in field oriented controlled (FOC) induction motor drives. In particular, the applicability of the estimated rotor flux, the current error signals and the outputs of the current controllers of a FOC drive are analyzed. Some block diagrams are presented which can be used to establish useful

S. M. A. Cruz; A. J. M. Cardoso

2007-01-01

205

New antiwindup PI controller for variable-speed motor drives  

Microsoft Academic Search

The windup phenomenon appears and results in performance degradation when the proportional-integral (PI) controller output is saturated. A new antiwindup PI controller is proposed to improve the control performance of variable-speed motor drives, and it is experimentally applied to the speed control of a vector-controlled induction motor driven by a pulsewidth modulated (PWM) voltage-source inverter (VSI). The integral state is

Hwi-Beon Shin

1998-01-01

206

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

207

Basic Characteristic of Electromagnetic Force in Induction Heating Application of Linear Induction Motor  

Microsoft Academic Search

Basic characteristic of electromagnetic force in induction heating application of single-sided linear induction motor (SLIM) which uses electromagnetic AC field is investigated by means of 2-D and 3-D numerical electromagnetic FEM calculation. The electromagnetic force in the normal direction consists of the attractive force caused by magnetization and the repelling force caused by Lorentz force. Although the normal force is

Takahiro Yamada; Keisuke Fujisaki

2008-01-01

208

Transistorized PWM Inverter-Induction Motor Drive System  

Microsoft Academic Search

The development of a transistorized pulsewidth modulated (PWM) inverter-induction motor traction drive system is described. 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

Steven C. Peak; Allan B. Plunkett

1983-01-01

209

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 krpm motor features a unique laminated rotor with a multi-function, high-strength copper alloy cage brazed with a novel process. Relatively thin, high-silicon

W. L. Soong; G. B. Kliman; R. N. Johnson; R. White; J. Miller

1999-01-01

210

Voltage Oscillations in Power Distribution Networks in the Presence of DFIGs and Induction Motor Loads  

E-print Network

Voltage Oscillations in Power Distribution Networks in the Presence of DFIGs and Induction Motor, DFIG, eigenvalue, in- duction motor, small-signal stability. I. INTRODUCTION Distributed generation (DG

Pota, Himanshu Roy

211

Consideration about problems and solutions of speed estimation method and parameter tuning for speed-sensorless vector control of induction motor drives  

Microsoft Academic Search

A classical model-based speed-sensorless field-oriented control method for a general-purpose induction machine is considered. Improved versions of both speed and stator resistance online estimators are presented with the aim of extending control capabilities down to zero speed. Only electrical stator measurements are needed, making the method suitable for general-purpose inverter applications. Online rotor resistance tuning is also included to fully

Hirokazu Tajima; Giuseppe Guidi; Hidetoshi Umida

2002-01-01

212

Effective Identification of FOC Induction Motor Parameters Based on Few Measurements  

Microsoft Academic Search

This paper applies genetic algorithms (GAs) to the problem of parameter identification for field orientation control (FOC) induction motors. Kron's two-axis dynamic model in per-unit system is given, and the model's parameters are estimated by a GA using the motor's dynamic response to a direct on-line start. Results with different levels of measurement noise are presented for the model both

K. S. Huang; Q. H. Wu; D. R. Turner

2002-01-01

213

Term selection for an induction motor via nonlinear Lasso  

NASA Astrophysics Data System (ADS)

In this paper, a commonly used third-order model of an induction motor with eight parameters is analyzed in order to classify the model parameters based on their degree of significance in the model behavior. Using the results of this classification, only the significant parameters of an induction motor need to be estimated from the measurements. The remainder of the parameters can be replaced by their typical values, which results in an optimization problem with a reduced dimension. The reduced parameter model needs less computation time and thus is better suited for real-time applications. The significance of this approach is greater when many induction motors or dynamic inductive loads in the system need to be identified. A nonlinear Least absolute shrinkage and selection operator (Lasso) term selection method is employed for this study. The Lasso method minimizes the sum of squared errors, with a constraint on the L1 norm of the parameter vector, which is used to push some parameters to zero. The main idea, when using this method for nonlinear models, involves incorporating the Lasso constraint in an iterative solution approach such as Gauss-Newton algorithm. This method reduces the variance of the parameter estimates, and simplifies the interpretation of the model. To evaluate the performance of the proposed algorithm, the parameters of an induction motor are estimated. Estimation is performed both for simulated and experimental data. The results of the proposed approach are compared to those of a method based on sensitivity analysis.

Rasouli, Mohammad

2014-05-01

214

Remote control for motor vehicle  

NASA Technical Reports Server (NTRS)

A remote controller is disclosed for controlling the throttle, brake and steering mechanism of a conventional motor vehicle, with the remote controller being particularly advantageous for use by severely handicapped individuals. The controller includes a remote manipulator which controls a plurality of actuators through interfacing electronics. The remote manipulator is a two-axis joystick which controls a pair of linear actuators and a rotary actuator, with the actuators being powered by electric motors to effect throttle, brake and steering control of a motor vehicle adapted to include the controller. The controller enables the driver to control the adapted vehicle from anywhere in the vehicle with one hand with minimal control force and range of motion. In addition, even though a conventional vehicle is adapted for use with the remote controller, the vehicle may still be operated in the normal manner.

Johnson, Dale R. (Inventor); Ciciora, John A. (Inventor)

1984-01-01

215

Coupling an induction motor type generator to ac power lines. [making windmill generators compatible with public power lines  

NASA Technical Reports Server (NTRS)

A system for coupling an induction motor type generator to an A.C. power line includes an electronic switch means that is controlled by a control system and is regulated to turn on at a relatively late point in each half cycle of its operation. The energizing power supplied by the line to the induction motor type generator is decreased and the net power delivered to the line is increased.

Nola, F. J. (inventor)

1984-01-01

216

Sensorless Speed Control of Permanent Magnet-Assisted Synchronous Reluctance Motor (PMa-SynRM)  

E-print Network

magnet motor. Also due to its synchronous operation, sensorless rotational control is possible along with higher power factor and better efficiency compared to the induction motor (IM). Therefore, this thesis first deals with the implementation of a...

Chakali, Anil K.

2011-02-22

217

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

218

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

219

Computational analysis of temperature rise phenomena in electric induction motors  

E-print Network

: Electric induction motor; Thermal model; Finite element analysis frequency 1. Introduction An electric properties and distributed heat sources. Although we witness advances achieved * Corresponding author. Tel of the overall performance and prevention of failures of these electric machines. In this paper we develop

Melnik, Roderick

220

Stability analysis of nonlinear voltage inverter-induction motor system  

Microsoft Academic Search

The paper highlights the increased instability of the induction motor due to the nonlinearity introduced by the voltage inverter, nonlinearity produced by the dead time required for switching devices on the same phase. Voltage errors on phase and between phases against the load null are presented, as well as the fact that phase voltage error against load null is in

D. Stanciu; Adriana Florescu; D. A. Stoichescu

2008-01-01

221

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

222

State of art on condition monitoring of induction motors  

Microsoft Academic Search

Condition monitoring in industry is desirable for increasing machinery availability, reducing consequential damage, and improving operational efficiency. This is significant in industries employing heavy duty machines. Here, an attempt is made to demonstrate the various faults that occur in induction motors, and also to give an insight about the techniques that are used for corrective\\/preventive action for them. Main emphasis

S. Jeevanand; Bhim Singh; B. K. Panigrahi; Vaibhav Negi

2010-01-01

223

Output Current Regulation with PWM Inverter--Induction Motor Drives  

Microsoft Academic Search

Current regulation plays an important part in the protection of solid-state drives operating from stiff voltage sources. Certain types of pulsewidth modulated (PWM) inverters, however, are not directly suited for peak or average output current regulation with induction motor loading. It is established in the paper that the typical output voltage response times of defined voltage waveform PWM inverters are

James B. Forsythe; S. B. Dewan

1975-01-01

224

Repair, Restoration, and Revitalization of Large Induction Motors  

Microsoft Academic Search

The importance of the repairing of large induction motors by service (repair) centers is discussed. The major consideration is on turnaround time. Because of time constraints caused by emergency turnaround, not enough emphasis is generally put on returning the equipment to original factory specifications. Consideration should be given to the insulation system, mechanical parts such as seals, the bearing system,

Kirk Armintor; Russell W. Mills; Walter G. Stiffler

1981-01-01

225

General adaptation law for MRAS high performance sensorless induction motor drives  

Microsoft Academic Search

This paper presents a new general adaptation law for sensorless vector control of induction motors using the model reference adaptive system (MRAS) approach with Luenberger observer. The method has been experimentally tested and compared with the classical adaptation mechanism at both low and high speed

G. Griva; F. Profumo; R. Bojoi; V. Bostan; M. Cuius; C. Ilas

2001-01-01

226

Tuning of PI gains for FOC of induction motors with guaranteed stability  

Microsoft Academic Search

It is well known that the performance of field oriented controllers (FOC) for induction motors critically depends on the tuning of the gains of the PI velocity loop. In this paper, the authors give some simple rules to carry out this task ensuring robust stability vis-a-vis uncertainty in the rotor time constant. The main contribution of their work is an

G. Espinosa-Perez; R. Ortega

1997-01-01

227

Research on computational model of iron losses in SPWM fed induction motors  

Microsoft Academic Search

The iron losses increase when induction motors were supplied by inverter. Based on separated iron losses model, an iron losses computational model considering harmonic component concerning induction motor fed by SPWM inverter was presented through harmonic analysis method. The parameters of the inverter were integrated in the model. A test bench for measuring the iron losses of induction motors was

Yunkai Huang; Kunpeng Li; Qiansheng Hu

2005-01-01

228

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

229

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

230

Reduction of Shaft Voltages and Bearing Currents in Five-Phase Induction Motor  

E-print Network

Induction motors are commonly used in numerous industrial applications. To maintain a reliable operation of the motor, it is important to identify the potential faults that may cause the motor to fail. Bearing failures are one of the main causes...

Hussain, Hussain

2012-07-16

231

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

232

Performance characteristics of three-phase induction motors  

NASA Technical Reports Server (NTRS)

An investigation into the characteristics of three phase, 400 Hz, induction motors of the general type used on aircraft and spacecraft is summarized. Results of laboratory tests are presented and compared with results from a computer program. Representative motors were both tested and simulated under nominal conditions as well as off nominal conditions of temperature, frequency, voltage magnitude, and voltage balance. Good correlation was achieved between simulated and laboratory results. The primary purpose of the program was to verify the simulation accuracy of the computer program, which in turn will be used as an analytical tool to support the shuttle orbiter.

Wood, M. E.

1977-01-01

233

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

234

Lightweight type linear induction motor and its characteristics  

SciTech Connect

At the Institute for Posts and Telecommunications Policy, a postal transportation system has been studied. This system would make use of linear induction motor (LIM)-driven vehicles for transporting mail between post offices in the Tokyo Metropolitan area. The system would connect the main post offices in the Tokyo area with tunnels circularly constructed underground and would transport mail with linear induction motor-driven vehicles. In this study, it is found that if vehicle weight is reduced, climbing capability could be considerably improved. Accordingly, the potential for reducing the weight of vehicle-mounted LIMs has been explored, and a prototype lightweight LIM has been manufactured. This paper reports on the lightweight LIM and its characteristics. 8 refs.

Osawa, S.; Yoshimuro, M.; Karita, M.; Ebihara, D.; Yokoi, T.

1994-08-01

235

Harmonic analysis of slip energy recovery induction motor drives  

SciTech Connect

The impact of drives on the power system in terms of harmonic generation is becoming increasingly important. Slip energy recover induction motor drives (SERIMDs) have the rectifier and inverter connected to the rotor instead of the stator (the case in most conventional drives). The harmonic content of the SERIMD is thus quite different and arguably, less onerous than conventional drives. This paper examines the harmonic content of key waveforms of SERIMDs. Predicted results are supported by extensive experimental results.

Refoufi, L. (Inst. National D'Electricite, Boumerdes (Algeria)); Pillay, P. (Univ. of New Orleans, LA (United States). Dept. of Electrical Engineering)

1994-12-01

236

Alternatives for assessing the electrical integrity of induction motors  

Microsoft Academic Search

The authors present alternative appropriate for detecting incipient failures in three-phase induction motors of the sizes commonly found in the process industries, with an emphasis on techniques resulting from a recently completed project. The techniques discussed are divided into three categories: periodic tests, sequence tests, and the decision-function method. The use of the effective negative-sequence impedance test is recommended for

Jeffery L. Kohler; Joseph Sottile; Frederick C. Trutt

1989-01-01

237

Traction and Normal Forces in the Linear Induction Motor  

Microsoft Academic Search

The single-sided stator and the double-sided stator configurations of the infinitely long linear induction motor are analyzed from electromagnetic field theory, and the traction force and the normal force equations are derived using the Maxwell magnetic stress tensor. The force normal to the air-gap plane, which has not been quantitatively evaluated or understood before, is found to be highly repulsive

BOON-TECK OOIAND; David White

1970-01-01

238

Closed-Loop Motor-Speed Control  

NASA Technical Reports Server (NTRS)

Electronic motor-speed control circuit designed to operate in electrically noisy environment. Includes optoelectronic pick-up device, placed inside motor housing to provide speed feedback signal. Automatically maintains speed motor at commanded value. Measures speed of motor in terms of frequency of pulses of infrared light chopped by fan blades of motor. Difference between measured and commanded speeds serves as control signal for external amplifier driving motor. Major advantage of circuit is low cost.

Smith, Matthew A.; Delcher, Ray C.; Huston, Steven W.

1989-01-01

239

Adaptive motor control in crayfish.  

PubMed

This article reviews the principles that rule the organization of motor commands that have been described over the past five decades in crayfish. The adaptation of motor behaviors requires the integration of sensory cues into the motor command. The respective roles of central neural networks and sensory feedback are presented in the order of increasing complexity. The simplest circuits described are those involved in the control of a single joint during posture (negative feedback-resistance reflex) and movement (modulation of sensory feedback and reversal of the reflex into an assistance reflex). More complex integration is required to solve problems of coordination of joint movements in a pluri-segmental appendage, and coordination of different limbs and different motor systems. In addition, beyond the question of mechanical fitting, the motor command must be appropriate to the behavioral context. Therefore, sensory information is used also to select adequate motor programs. A last aspect of adaptability concerns the possibility of neural networks to change their properties either temporarily (such on-line modulation exerted, for example, by presynaptic mechanisms) or more permanently (such as plastic changes that modify the synaptic efficacy). Finally, the question of how "automatic" local component networks are controlled by descending pathways, in order to achieve behaviors, is discussed. PMID:11124446

Cattaert, D; Le Ray, D

2001-02-01

240

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

241

Motor Controller System For Large Dynamic Range of Motor Operation  

NASA Technical Reports Server (NTRS)

A motor controller system uses a rotary sensor with a plurality of signal conditioning units, coupled to the rotary sensor. Each of these units, which is associated with a particular range of motor output shaft rotation rates, generate a feedback signal indicative of the position of the motor s output shaft. A controller (i) converts a selected motor output shaft rotation rate to a corresponding incremental amount of rotational movement for a selected fixed time period, (ii) selects, at periodic completions of the selected fixed time period, the feedback signal from one of the signal conditioning units for which the particular range of motor output shaft rotation rates associated therewith encompasses the selected motor output shaft rotation rate, and (iii) generates a motor drive signal based on a difference between the incremental amount of rotational movement and the feedback signal from the selected one of the signal conditioning Units.

Howard, David E. (Inventor); Alhorn, Dean C. (Inventor); Smith, Dennis A. (Inventor); Dutton, Kenneth R. (Inventor); Paulson, Mitchell Scott (Inventor)

2006-01-01

242

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 structural–functional 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

243

Sensorless induction motor drive with a single DC-link current sensor and instantaneous active and reactive power feedback  

Microsoft Academic Search

This paper proposes a novel torque and speed control structure for low-cost induction motor variable-speed drives with a single DC-link current sensor. The controller is based on reconstruction of the active and instantaneous reactive power from the DC-link current without the use of a shaft sensor. An effective way of achieving tracking of set values of motor torque and flux

Slobodan N. Vukosavic; Aleksandar M. Stankovic

2001-01-01

244

Method and system for determining induction motor speed  

DOEpatents

A non-linear, semi-parametric neural network-based adaptive filter is utilized to determine the dynamic speed of a rotating rotor within an induction motor, without the explicit use of a speed sensor, such as a tachometer, is disclosed. The neural network-based filter is developed using actual motor current measurements, voltage measurements, and nameplate information. The neural network-based adaptive filter is trained using an estimated speed calculator derived from the actual current and voltage measurements. The neural network-based adaptive filter uses voltage and current measurements to determine the instantaneous speed of a rotating rotor. The neural network-based adaptive filter also includes an on-line adaptation scheme that permits the filter to be readily adapted for new operating conditions during operations.

Parlos, Alexander G.; Bharadwaj, Raj M.

2004-03-30

245

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

E-print Network

have small impact with reference to industry. This paper will provide an introduction to the Wanlass technology and its application to induction motors and generators. This will be accomplished through analysis of motor and generator tests....

Asp, D. E.

1984-01-01

246

Static Induction Motor Drive Capabilities for the Petroleum Industry  

Microsoft Academic Search

The petroleum and chemical industries utilize fluid handling equipment extensively. Pumps have historically been driven by constant speed ac motors with flow control, when required. provided by valves. It has been estimated that 30 percent or more of the electrical energy used by a typical refinery is wasted as a result of the throttling effect of control valves. Electrical, mechanical,

Dennis A. Jarc; John D. Robechek

1982-01-01

247

Model-Based Diagnostics and Fault Assessment of Induction Motors with Incipient Faults  

Microsoft Academic Search

\\u000a Model-based diagnostics is relatively new for machine condition monitoring. Unlike signal-based approaches, health metrics\\u000a are evaluated via physics-based models and sensor measurements. In this article, a framework of model-based fault diagnosis\\u000a and severity assessment for induction motors is presented. A conventional symmetric induction motor model is suitable for\\u000a simulation but cannot capture faulty behavior accurately. Induction motor is modeled in

Mohsen Nakhaeinejad; Jaewon Choi; Michael D. Bryant

248

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

249

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

250

Motor Control: The Heart of Kinesiology  

ERIC Educational Resources Information Center

This brief review presents the subjective view of the author on the history of motor control and its current state among the subdisciplines of kinesiology. It summarizes the current controversies and challenges in motor control and emphasizes the necessity for an adequate set of notions that would make motor control (and kinesiology) a science.…

Latash, Mark L.

2008-01-01

251

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

252

232 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 17, NO. 2, MARCH 2002 Current Control Strategy for Brushless DC Motors  

E-print Network

, the power-to-weight ratio of PMSM and BDCM is higher than equivalent squirrel cage induction machines the power-to-weight ratio and the efficiency. For induction motors, flux control has been developed, which

Catholic University of Chile (Universidad Católica de Chile)

253

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

254

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 for a rolling shutter induction motor. First of all the article shows the analytical expression of the capacitor the implementation on the industrial application. Index Terms--Capacitor motors, Induction motors, Sensorless speed

Boyer, Edmond

255

Redundant information encoding in primary motor cortex during natural and prosthetic motor control  

E-print Network

Redundant information encoding in primary motor cortex during natural and prosthetic motor control of Neurology, University of California, San Francisco, CA, USA M. C. Gastpar School of Computer and prosthetic motor control. Keywords Mutual information . Neural ensemble . Motor control . Brain

Pillow, Jonathan

256

A study on rotor FOC method using matrix converter fed induction motor with common-mode voltage reduction  

Microsoft Academic Search

Currently, most of researches on matrix converter concerns about indirect rotor flux oriented control (FOC) method use MC indirect space vector modulation (SVM) technique. This paper introduces a direct rotor flux oriented control method using MC fed induction motor with the direct space vector modulation technique. Furthermore, the proposed technique of common-mode voltage reduction in direct space vector has been

Hoang M. Nguyen; Tae-Won Chun

2007-01-01

257

Basics of Motor Control Centers  

NSDL National Science Digital Library

This course is one of the quickStep series offered by Siemens in Motor Control Centers. These are FREE on-line industrial knowledge building tutorials. quickSTEPs are a great start for industry novices moving into technical jobs or staff in operational support rolls. They can also be very effectively used as out of class assignments for review or to build fundamental skills. Each course includes: an online tutorial organized as a number of units, lessons with self check quiz questions, a glossary of terms, a self-check final exam with scoring, an extensive downloadable PDF study guide. This course offers information about: electrical power-motor control centers, units, final, glossary and a 72 page study guide.

258

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

259

ABOUT SPEECH MOTOR CONTROL COMPLEXITY Pascal Perrier  

E-print Network

20/07/2005 ABOUT SPEECH MOTOR CONTROL COMPLEXITY Pascal Perrier Institut de la Communication Parlée ABSTRACT A key issue in research about speech motor control is the one of the level of complexity of the speech motor system, including the complex tongue-jaw biomechanics? Or would more simple internal

Paris-Sud XI, Université de

260

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

261

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

Code of Federal Regulations, 2012 CFR

...controllers and motor-control centers. (a) General. The enclosure...controller or motor-control center must meet either NEMA...additional low-voltage release load is within the capacity of one...controller and motor control center must be marked externally...

2012-10-01

262

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

Code of Federal Regulations, 2014 CFR

...controllers and motor-control centers. (a) General. The enclosure...controller or motor-control center must meet either NEMA...additional low-voltage release load is within the capacity of one...controller and motor control center must be marked externally...

2014-10-01

263

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

Code of Federal Regulations, 2013 CFR

...controllers and motor-control centers. (a) General. The enclosure...controller or motor-control center must meet either NEMA...additional low-voltage release load is within the capacity of one...controller and motor control center must be marked externally...

2013-10-01

264

Comparison of Alternative Equivalent Circuits of Induction Motor with Real Machine Data  

NASA Astrophysics Data System (ADS)

The algorithms based on separated control of the motor flux and torque is used in order to gain the maximum performance from the induction machine. To push the efficiency and dynamics limits of the IM to its limits mostly FOC or DTC control strategies are used. Both are based on the knowledge of the hardly measurable variable-machine flux. To obtain the information about inner machine flux models based on the machine equivalent circuit are mostly used. Therefore the accuracy of the equivalent circuits has direct influence on the accuracy of the machine control. To reduce the complexity of the mathematical model the resistances and inductances are concentrated to one component and three phase winding is assumed to be symmetrical. In order to design control strategy for the induction motor, system equations and equivalent circuit must be established at first. This paper examines and compares some of the issues of adequate machine modeling and attempts to provide a firmer basis for selection of an appropriate model and to confirm or disprove the equivalence of different approaches. The results of the IM model run up are then compared to the results obtained from the measurements on the real machine and the equivalency is discussed.

Bradna, J.; Bauer, J.; Fligl, S.; Hlinovsky, V.

265

APPLICATION OF SPECTRAL KURTOSIS TO BEARING FAULT DETECTION IN INDUCTION MOTORS  

E-print Network

APPLICATION OF SPECTRAL KURTOSIS TO BEARING FAULT DETECTION IN INDUCTION MOTORS Valeriu Vrabie1 in asynchronous machines. This one-dimensional spectral measure allows to study the nature of the harmonic components of the stator current of an induction motor running at a constant rotation speed. It provides

Paris-Sud XI, Université de

266

Fault Diagnosis of Asynchronous Induction Motor Based on BP Neural Network  

Microsoft Academic Search

For asynchronous induction motor, it is necessary to carry out fault diagnosis in time. The traditional fault diagnosis methods have the shortcomings such as the diagnosis slow speed, low accuracy. In this paper, for the common fault characteristics of asynchronous induction motor, the fault diagnosis method based on improved BP algorithm, by using of the diagnosis model, is adopted to

Zhao Xiaodong; Tang Xinliang; Zhao Juan; Zhang Yubin

2010-01-01

267

Computation of winding inductances of permanent magnet brushless DC motors with damper windings by energy perturbation  

Microsoft Academic Search

A method for the calculation of motor winding inductances is presented in which damping effects due to metallic retainment sleeves and intentionally introduced damper bar (amortisseur) windings are included. The inductance computation method makes use of the combined energy perturbation concept and finite-element field solutions. These parameters are necessary for the prediction of the dynamic performance of such motors with

N. A. Demerdash; T. M. Hijazi; A. A. Arkadan

1988-01-01

268

Recent Developments in High Performance Variable Speed Multiphase Induction Motor Drives  

Microsoft Academic Search

Multiphase induction machines offer numerous advantages, when compared to their three-phase counterpart. As the number of machine's phases is essentially unlimited when the motor is supplied from a power electronic converter, multiphase induction motor drives are nowadays considered as a potentially viable solution for numerous applications, such as for example electric ship propulsion, traction, electric and hybrid electric vehicles and

Emil Levi

269

Magnetic Suspension Force in an Induction Bearingless Motor with a Squirrel Cage Rotor  

Microsoft Academic Search

Theoretical equations of magnetic force in an induction bearingless motor have been reported. In the bearingless motor, both 4-pole and 2-pole windings are stored in stator slots for torque and suspension force generation. In the analysis, squirrel cage rotor currents are considered. These currents are induced by both torque and suspension winding currents. Inductance matrix is represented by four sets

Tatsuya Katou; Akira Chiba; Tadashi Fukao

2005-01-01

270

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

Code of Federal Regulations, 2011 CFR

...controllers and motor-control centers. 111.70-3 ...DEPARTMENT OF HOMELAND SECURITY (CONTINUED) ELECTRICAL...and motor-control centers. (a) General...or its resumption to operation is not hazardous...controller and motor control center must be marked...

2011-10-01

271

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

Code of Federal Regulations, 2010 CFR

...controllers and motor-control centers. 111.70-3 ...DEPARTMENT OF HOMELAND SECURITY (CONTINUED) ELECTRICAL...and motor-control centers. (a) General...or its resumption to operation is not hazardous...controller and motor control center must be marked...

2010-10-01

272

5-DOF Controlled Self-Bearing Motor  

NASA Astrophysics Data System (ADS)

A novel 5-DOF actively controlled self-bearing motor that combines the functions of a motor, two radial AMBs, and an axial AMB has been developed to achieve smaller size and higher performance simultaneously. In this paper, magnetic suspension performance of the 5-DOF controlled self-bearing motor is reported. First, radial control performance of the developed self-bearing motor is evaluated by the radial experimental setup. Next, tilt control performance and 5-DOF active control performance are evaluated by the 5-DOF experimental setup. Finally, the frequency response in the 5-DOF is measured with the contact-free levitation. The 5-DOF controlled self-bearing motor produced sufficient radial force and tilt control torque to overcome the radial negative stiffness and to stabilize the rotor. The sufficient frequency bandwidth was observed in the frequency response and the self-bearing motor successfully suppressed vibration at the resonant frequencies.

Ishikawa, Tatsuya; Matsuda, Ken-Ichi; Kondo, Ryou; Masuzawa, Toru

273

Dynamic Performance of Subway Vehicle with Linear Induction Motor System  

NASA Astrophysics Data System (ADS)

The light rail vehicle with Linear Induction Motor (LIM) bogie, which is a new type of urban rail traffic tool, has the advantages of low costs, wide applicability, low noise, simple maintenance and better dynamic behavior. This kind of vehicle, supported and guided by the wheel and rail, is not driven by the wheel/rail adhesion force, but driven by the electromagnetic force between LIM and reaction plate. In this paper, three different types of suspensions and their characteristic are discussed with considering the interactions both between wheel and rail and between LIM and reaction plate. A nonlinear mathematical model of the vehicle with LIM bogie is set up by using the software SIMPACK, and the electromechanical model is also set up on Simulink roof. Then the running behavior of the LIM vehicle is simulated, and the influence of suspension on the vehicle dynamic performance is investigated.

Wu, Pingbo; Luo, Ren; Hu, Yan; Zeng, Jing

274

Optical system for the supervision of the operation of a induction motor  

NASA Astrophysics Data System (ADS)

In this work we present an optical system for the supervision of the operation of an induction motor. We used a Cyclic interferometer for the measurement of the vibrations produced by the motor motion and obtain a frequency spectrum via a Fourier transform of the signal. According to the spectrum, we can know the operation conditions of the induction motor. The optical system consists of a Cyclic Interferometer, a data acquisition board and virtual instrument.

Villanueva-Reyes, V. M.; Vazquez-Nava, R. A.

2011-10-01

275

Optical system for the supervision of the operation of an induction motor  

NASA Astrophysics Data System (ADS)

In this work we present an optical system for the supervision of the operation of an induction motor. We used a Mach- Zehnder interferometer and cyclic interferometer for the measurement of the vibrations produced by the motor motion and obtain a frequency spectrum via a Fourier transform of the signal. According to the spectrum, we can know the operation conditions of the induction motor. The optical system consist of the Interferometer, a data acquisition board and virtual instrument.

Villanueva-Reyes, V. M.; Vazquez-Nava, R. A.

2011-09-01

276

Field assessment of induction motor efficiency through air-gap torque  

SciTech Connect

Induction motors are the most popular motors used in industry. This paper further suggests the use of air-gap torque method to evaluate their efficiency and load changes. The fundamental difference between Method E and the air-gap torque method is discussed. Efficiency assessments conducted on induction motors under various conditions show the accuracy and potential of the air-gap torque method.

Hsu, J.S.; Sorenson, P.L.

1995-11-01

277

Multi motor controller MMC32: User manual  

SciTech Connect

The MMC32 is a versatile stepping motor controller for systems with many motors. The system as currently configured can control up to 32 motors, with all motors capable of full speed operation concurrently in different pulse modes. Each individual motor`s position can be monitored in an open loop, a closed loop, or an encoded loop, even when the motor is moving. There are 2 limit switch inputs for each motor, and a further input to accept a reference position marker. The motors can be controlled via a front panel keyboard with display, or by a host computer over an IEEE-488 interface. Both methods can be used together if required. The details for manual operation are in Chapter 4, and for remote computer control are in Chapter 5. The manual operation is controlled by the front panel keypad with interactive menu display. There is an ``emergency stop`` key on the front panel keypad to abort the motion of all motors without losing track of the motors` position.

Feng-Berman, S.K.; Siddons, D.P.

1993-02-01

278

Low cost wireless sensor network for in-field operation monitoring of induction motors  

Microsoft Academic Search

In most modern industries there is a growing need for high efficiency and availability in motor driver systems. Moreover, motor operation monitoring is necessary to the implementation of proper and cost-effective motor maintenance, repair and replacing strategies. In this paper, a wireless sensor network for in-field operation monitoring of three-phase squirrel-cage induction motors is proposed. The network is able to

J. Pedro Amaro; F. J. T. E. Ferreira; R. Cortesao; N. Vinagre; R. P. Bras

2010-01-01

279

Multi motor controller MMC32: User manual  

SciTech Connect

The MMC32 is a versatile stepping motor controller for systems with many motors. The system as currently configured can control up to 32 motors, with all motors capable of full speed operation concurrently in different pulse modes. Each individual motor's position can be monitored in an open loop, a closed loop, or an encoded loop, even when the motor is moving. There are 2 limit switch inputs for each motor, and a further input to accept a reference position marker. The motors can be controlled via a front panel keyboard with display, or by a host computer over an IEEE-488 interface. Both methods can be used together if required. The details for manual operation are in Chapter 4, and for remote computer control are in Chapter 5. The manual operation is controlled by the front panel keypad with interactive menu display. There is an emergency stop'' key on the front panel keypad to abort the motion of all motors without losing track of the motors' position.

Feng-Berman, S.K.; Siddons, D.P.

1993-02-01

280

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

281

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

282

Original Articles Geometric Control of Cardiomyogenic Induction  

E-print Network

Original Articles Geometric Control of Cardiomyogenic Induction in Human Pluripotent Stem Cells Differentiating aggregates are thought to mimic the environment of the peri-implantation embryo where in

Zandstra, Peter W.

283

Anti-Windup PID Controller With Integral State Predictor for Variable-Speed Motor Drives  

Microsoft Academic Search

The windup phenomenon appears and results in per- formance degradation when the proportional-integral-derivative (PID) controller output is saturated. Integral windup is analyzed on the PI plane, and a new anti-windup PID controller is proposed to improve control performance of variable-speed motor drives and is experimentally applied to the speed control of a vector- controlled induction motor driven by a pulse

Hwi-Beom Shin; Jong-Gyu Park

2012-01-01

284

The pulsed linear induction motor concept for high-speed trains  

SciTech Connect

The SERAPBIM (SEgmented RAil PHased Induction Motor) concept is a linear induction motor concept which uses rapidly-pulsed magnetic fields and a segmented reaction rail, as opposed to low-frequency fields and continuous reaction rails found in conventional linear induction motors. These improvements give a high-traction, compact, and efficient linear motor that has potential for advanced high speed rail propulsion. In the SERAPBIM concept, coils on the vehicle push against a segmented aluminum rail, which is mounted on the road bed. Current is pulsed as the coils cross an edge of the segmented rail, inducing surface currents which repel the coil. The coils must be pulsed in synchronization with the movement by reaction rail segments. This is provided by a sense-and-fire circuit that controls the pulsing of the power modulators. Experiments were conducted to demonstrate the feasibility of the pulsed induction motor and to collect data that could be used for scaling calculations. A 14.4 kg aluminum plate was accelerated down a 4 m track to speeds of over 15 m/sec with peak thrust up to 18 kN per coilset. For a trainset capable of 200 mph speed, the SERAPHIM concept design is based on coils which are each capable of producing up to 3.5 kN thrust, and 30 coil pairs are mounted on each power car. Two power cars, one at each end of the train, provide 6 MW from two gas turbine prime power units. The thrust is about 210.000 N and is essentially constant up to 200 km/hr since wheel slippage does not limit thrust as with conventional wheeled propulsion. A key component of the SERAPHIM concept is the use of passive wheel-on-rah support for the high speed vehicle. Standard steel wheels are capable of handling over 200 mph. The SERAPHIM cost is comparable to that for steel-wheel high-speed rail, and about 10% to 25% of the projected costs for a comparable Maglev system.

Turman, B.N.; Marder, B.M.; Rohwein, G.J.; Aeschliman, D.P.; Kelley, J.B.; Cowan, M.; Zimmerman, R.M.

1995-06-01

285

An improved DTC strategy for induction motor control fed by a multi-cell voltage source inverter for high power applications  

Microsoft Academic Search

Voltage-source inverters are generally composed of only one switching cell per phase. The classical direct torque control (DTC) technique for this kind of inverter has well known advantages, but may not be used in high power systems due to the high frequency that this technique typically requires. The present work deals with the use of a multi-cell voltage-source inverter controlled

C. A. Martins; T. A. Meynard; X. Roboam; A. S. Carvalho

1998-01-01

286

Parameter estimation of vector controlled induction machine  

E-print Network

This thesis deals with the modeling and control of induction machine under indirect vector control with parameter estimation in order to get better field oriented performance. Because of its excellent decoupled control, wide flux weakening region...

Rahman, Tahmid Ur

2002-01-01

287

Motor Control Research Requires Nonlinear Dynamics  

ERIC Educational Resources Information Center

The author comments on the original article "The Cinderella of psychology: The neglect of motor control in the science of mental life and behavior," by D. A. Rosenbaum. Rosenbaum draws attention to the study of motor control and evaluates seven possible explanations for why the topic has been relatively neglected. The point of this comment is that…

Guastello, Stephen J.

2006-01-01

288

TORQUE VECTOR CONTROL (TVC) OF AXIALLY-LAMINATED ANISOTROPIC (ALA) ROTOR RELUCTANCE SYNCHRONOUS MOTORS  

Microsoft Academic Search

Axially-laminated anisotropic (ALA) rotor reluctance synchronous motors (RSMs) have been proved recently capable of higher torque density, higher power factor and efficiency compared to their induction motor counterpart with the same stator. Vector current control systems have been proposed for such drives, based on maximum available torque constant current angle or minimum current for a given torque constant current angle

I. BOLDEA; Z. X. FU; S. A. NASAR

1991-01-01

289

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

290

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

291

Multilevel DC Link Inverter for Brushless Permanent Magnet Motors with Very Low Inductance  

SciTech Connect

Due to their long effective air gaps, permanent magnet motors tend to have low inductance. The use of ironless stator structure in present high power PM motors (several tens of kWs) reduces the inductance even further (< 100 {micro}H). This low inductance imposes stringent current regulation demands for the inverter to obtain acceptable current ripple. An analysis of the current ripple for these low inductance brushless PM motors shows that a standard inverter with the most commonly used IGBT switching devices cannot meet the current regulation demands and will produce unacceptable current ripples due to the IGBT's limited switching frequency. This paper introduces a new multilevel dc link inverter, which can dramatically reduce the current ripple for brushless PM motor drives. The operating principle and design guidelines are included.

Su, G.J.

2001-10-29

292

Propulsive characteristics of a novel linear hybrid motor with both induction and synchronous operations  

SciTech Connect

This paper treats a novel linear hybrid motor (LHM) by both induction and synchronous operations. The proposed motor consists of one pair of linear synchronous motors (LSMs) and a linear induction motor (LIM). The primary-cores of both LSM and LIM have a common ring winding, and the secondary solid-conductor is arranged in both LIM and the interpole space of LSM. The feature of the motor is that the undesirable vertical force in LSM is offset by the symmetrical double-sided construction and the secondary is capable of self-starting by induction operation. From the investigation by the three-dimensional finite element analysis and experiment, the authors derive an optimal exciting condition for starting, and then verify that the proposed LHM is effective for practical use.

Jeon, W.J.; Katoh, S.; Iwamoto, T.; Kamiya, Y.; Onuki, T.

1999-09-01

293

Structured attachment of bacterial molecular motors for defined microflow induction  

NASA Astrophysics Data System (ADS)

Bacterial rotational motor complexes that propel flagellated bacteria possess unique properties like their size of a few nanometres and the ability of selfreproduction that have led to various exciting applications including biohybrid nano-machines. One mandatory prerequisite to utilize bacterial nano motors in fluid applications is the ability to transfer force and torque to the fluid, which usually can be achieved by attachment of the bacterial cell to adequate surfaces. Additionally, for optimal transfer of force or torque, precise control of the position down to the single cell level is of utmost importance. Based on a PIV (particle image velocimetry) evaluation of the induced flow of single bacteria,we propose and demonstrate attachment of arbitrary patterns of motile bacterial cells in a fast light-based two-step process for the first time to our knowledge. First, these cells are pre-structured by holographic optical tweezers and then attached to a homogeneous, polystyrene-coated surface. In contrast to the few approaches that have been implemented up to now and which rely on pre-structured surfaces, our scheme allows for precise control on a single bacterium level, is versatile, interactive and has low requirements with respect to the surface preparation.

Woerdemann, Mike; Hörner, Florian; Denz, Cornelia

2014-01-01

294

Discrimination among mechanical fault types in induction motors using electrical measurements  

E-print Network

for thc degree of NIASTER OF SCIENCE Dece&nber 2002 Ms jor Subject: Kfcr hanical Engineering DISCRIMINATION AMONG MECHANICAL FAULT TYPES IN INDUCTION MOTORS USING ELECTRICAL MEASUREMENTS A Thesis by , JUSTIN ROBERT MCFATTER Submitted to Texas AE... of Depar trrrerrt) Deccrrrbcr 2002 Major Subject: Kfechaurcal Engineering 111 ABSTRACT Discrimination Among Mechanical Fault Types in Induction Motors Using Electrical Measurements (December 2002) Justin Robert McFatter, B. S. , Texas A&M U...

McFatter, Justin Robert

2002-01-01

295

Simulation of SVPWM based FOC of CSI fed induction motor drive  

Microsoft Academic Search

The application of current source inverters (CSI)in induction motor (IM) drives offers a number of advantages, including voltage boosting capability, natural shoot-through short-circuit protection and generation of sinusoidal voltages. In this paper, an attempt to model the CSI fed IM drive is presented. The mathematical model takes into account of the inverter, and induction motor dynamics and is established in

Deepak Ronanki; K. Rajesh; P. Parthiban

2012-01-01

296

Application of a 5500 RPM high speed induction motor and drive in a 7000 HP natural gas compressor installation  

Microsoft Academic Search

The reasons for the selection, and considerations in the implementation, of high-speed induction motors and variable-frequency drives for a compressor station in an unmanned installation on a gas pipeline are presented. The selection options relevant to the application are reviewed: gas turbine versus motor driver, high-speed motor versus conventional motor, and induction versus synchronous motor. Design features of the major

S. C. LaGrone; M. C. Griggs; M. Bressani

1992-01-01

297

Motor torque compensation of an induction electric motor by adjusting a slip command during periods of supposed change in motor temperature  

DOEpatents

The present invention maintains constant torque in an inverter driven AC induction motor during variations in rotor temperature. It is known that the torque output of a given AC induction motor is dependent upon rotor temperature. At rotor temperatures higher than the nominal operating condition the rotor impedance increases, reducing the rotor current and motor torque. In a similar fashion, the rotor impedance is reduced resulting in increased rotor current and motor torque when the rotor temperature is lower than the nominal operating condition. The present invention monitors the bus current from the DC supply to the inverter and adjusts the slip frequency of the inverter drive to maintain a constant motor torque. This adjustment is based upon whether predetermined conditions implying increased rotor temperature or decreased rotor temperature exist for longer that a predetermined interval of time.

Kelledes, William L. (Brighton, MI); St. John, Don K. (Livonia, MI)

1992-01-01

298

Leakage current reduction for a high-frequency carrier inverter feeding an induction motor  

Microsoft Academic Search

A PWM inverter with an induction motor often has a problem with a leakage current that flows through the distributed electrostatic capacitance from the motor windings to the ground. The authors present an analytical model of the system with leakage current and the strategy to suppress it. Two types of suppression circuit are discussed. The current-type circuit, although compact in

Y. Murai; T. Kubota; Y. Kawase

1992-01-01

299

The application of wireless sensor networks for condition monitoring in three-phase induction motors  

Microsoft Academic Search

The most commonly used technique for the detection of faults in large three-phase induction motors is to measure the supply current fed into the motor and analyze the signal spectrum. This technique is well established and has been shown to be indicative of a faulty condition. However, current signature analysis is usually used by very skilled technicians using expensive equipment.

Xin Xue; V. Sundararajan; Wallace P. Brithinee

2007-01-01

300

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

301

Harmonic reduction in DC link current of a PWM induction motor drive by active filtering  

Microsoft Academic Search

Substitution for DC motors by pulse-width modulation (PWM) inverter-fed induction motors in railways supplied by DC voltage leads to high harmonic levels in the overhead line current. This results in interference in the signaling systems. In order to satisfy the requirements of Belgian railway operators, the problem of the harmonic reduction in overhead line current has been addressed. An active

C. Broche; J. Lobry; P. Colignon; A. Labart

1992-01-01

302

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

303

Hot gas thrust vector control motor  

Microsoft Academic Search

A hot gas thrust vector control (HGTVC) motor developed in the framework of a Foreign Weapon Evaluation program is discussed. Two HGTVC versions were evaluated on the two nozzles of the program, normal injection with a blunt pintle and 10 deg upstream injection with a tapered pintle. The HGTVC system was tested on a modified ORBUS-1 motor which is based

Michel Berdoyes; Russell A. Ellis

1992-01-01

304

A COMPUTATIONAL NEUROANATOMY FOR MOTOR CONTROL  

PubMed Central

The study of patients to infer normal brain function has a long tradition in neurology and psychology. More recently, the motor system has been subject to quantitative and computational characterization. The purpose of this review is to argue that the lesion approach and theoretical motor control can mutually inform each other. Specifically, one may identify distinct motor control processes from computational models and map them onto specific deficits in patients. Here we review some of the impairments in motor control, motor learning and higher-order motor control in patients with lesions of the corticospinal tract, the cerebellum, parietal cortex, the basal ganglia, and the medial temporal lobe. We attempt to explain some of these impairments in terms of computational ideas such as state estimation, optimization, prediction, cost, and reward. We suggest that a function of the cerebellum is system identification: to built internal models that predict sensory outcome of motor commands and correct motor commands through internal feedback. A function of the parietal cortex is state estimation: to integrate the predicted proprioceptive and visual outcomes with sensory feedback to form a belief about how the commands affected the states of the body and the environment. A function of basal ganglia is related to optimal control: learning costs and rewards associated with sensory states and estimating the “cost-to-go” during execution of a motor task. Finally, functions of the primary and the premotor cortices are related to implementing the optimal control policy by transforming beliefs about proprioceptive and visual states, respectively, into motor commands. PMID:18251019

Shadmehr, Reza; Krakauer, John W.

2008-01-01

305

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

306

What is optimal about motor control?  

PubMed

This article poses a controversial question: is optimal control theory useful for understanding motor behavior or is it a misdirection? This question is becoming acute as people start to conflate internal models in motor control and perception (Poeppel et al., 2008; Hickok et al., 2011). However, the forward models in motor control are not the generative models used in perceptual inference. This Perspective tries to highlight the differences between internal models in motor control and perception and asks whether optimal control is the right way to think about things. The issues considered here may have broader implications for optimal decision theory and Bayesian approaches to learning and behavior in general. PMID:22078508

Friston, Karl

2011-11-01

307

Computer-Controlled, Motorized Positioning System  

NASA Technical Reports Server (NTRS)

Computer-controlled, motorized positioning system developed for use in robotic manipulation of samples in custom-built secondary-ion mass spectrometry (SIMS) system. Positions sample repeatably and accurately, even during analysis in three linear orthogonal coordinates and one angular coordinate under manual local control, or microprocessor-based local control or remote control by computer via general-purpose interface bus (GPIB).

Vargas-Aburto, Carlos; Liff, Dale R.

1994-01-01

308

Fault detection and diagnosis of induction motors using motor current signature analysis and a hybrid FMM-CART model.  

PubMed

In this paper, a novel approach to detect and classify comprehensive fault conditions of induction motors using a hybrid fuzzy min-max (FMM) neural network and classification and regression tree (CART) is proposed. The hybrid model, known as FMM-CART, exploits the advantages of both FMM and CART for undertaking data classification and rule extraction problems. A series of real experiments is conducted, whereby the motor current signature analysis method is applied to form a database comprising stator current signatures under different motor conditions. The signal harmonics from the power spectral density are extracted as discriminative input features for fault detection and classification with FMM-CART. A comprehensive list of induction motor fault conditions, viz., broken rotor bars, unbalanced voltages, stator winding faults, and eccentricity problems, has been successfully classified using FMM-CART with good accuracy rates. The results are comparable, if not better, than those reported in the literature. Useful explanatory rules in the form of a decision tree are also elicited from FMM-CART to analyze and understand different fault conditions of induction motors. PMID:24808459

Seera, Manjeevan; Lim, Chee Peng; Ishak, Dahaman; Singh, Harapajan

2012-01-01

309

Speed Sensor-less Direct Power Control of a Matrix Converter Fed Induction Generator for Variable Speed Wind Turbines  

Microsoft Academic Search

In this paper, the conventional direct torque control (DTC) scheme for induction motor drives is extended to directly control the active power (DPC) delivered to the grid by a wind turbine driven squirrel cage induction generator (SCIG). The SCIG is interfaced to the grid through an AC-AC matrix converter. A constant switching frequency based direct power control scheme with flux

T. Satish; K. K. Mohapatra; N. Mohan

2006-01-01

310

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...

311

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

312

On the drive control strategy of permanent magnet linear synchronous motor  

Microsoft Academic Search

Linear motor is an electromagnetic device which could directly generate linear motion. It can be taken as an evolvement of rotating motor. Suppose to cut it apart along its diameter, and string the circumference, then we can get linear motor. Liner motor can be divided into linear induction motor, linear synchronous motor, linear DC motor and other linear motors corresponded

Hongliang Lu

2011-01-01

313

Does the motor system need intermittent control?  

PubMed

Explanation of motor control is dominated by continuous neurophysiological pathways (e.g., transcortical, spinal) and the continuous control paradigm. Using new theoretical development, methodology, and evidence, we propose intermittent control, which incorporates a serial ballistic process within the main feedback loop, provides a more general and more accurate paradigm necessary to explain attributes highly advantageous for competitive survival and performance. PMID:24819544

Loram, Ian David; van de Kamp, Cornelis; Lakie, Martin; Gollee, Henrik; Gawthrop, Peter J

2014-07-01

314

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

315

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

316

An AC motor drive with power factor control for low cost applications  

Microsoft Academic Search

In this work, a new concept of integrating motor and power factor controls, by using a single-phase to three-phase DSP based six-switch converter topology, is presented. Unlike other configurations which use extra switch(es) and\\/or extra boost inductor, in the proposed topology the boost action, for input current shaping, is done by the motor leakage inductances. The power factor control and

M. D. Bellar; B. K. Lee; B. Fahimi; M. Ehsani

2001-01-01

317

Intelligent motion control for linear piezoelectric ceramic motor drive.  

PubMed

Since the dynamic characteristics of a linear piezoelectric ceramic motor (LPCM) are highly nonlinear and time varying, it is difficult to design a suitable motor drive and position controller that realizes accurate position control at all time. This study investigates a double-inductance double-capacitance (LLCC) resonant driving circuit and a sliding-mode fuzzy-neural-network control (SMFNNC) system for the motion control of an LPCM. First, the motor structure and LLCC driving circuit of an LPCM are introduced. The LLCC resonant inverter is designed to operate at an optimal switching frequency such that the output voltage will not be influenced by the variation of quality factor. Moreover, a SMFNNC system is designed to achieve favorable tracking performance without precise dynamic models being controlled. All adaptive learning algorithms in the SMFNNC system are derived in the sense of Lyapunov stability analysis, so that system-tracking stability can be guaranteed in the closed-loop system. The effectiveness of the proposed driving circuit and control system is verified by experimental results. PMID:15503505

Wai, Rong-Jong; Lee, Jeng-Dao

2004-10-01

318

Fuzzy controller for inverter fed induction machines  

Microsoft Academic Search

An induction machine operated with a direct self controller (DSC) shows a sluggish response during startup and under changes of torque command. Fuzzy logic is used in conjunction with direct self control to minimize these problems. A fuzzy logic controller chooses the switching states based on a set of fuzzy variables. Flux position, error in flux magnitude and error in

Sayeed A. Mir; Donald S. Zinger; Malik E. Elbuluk

1994-01-01

319

Summary of electric vehicle dc motor-controller tests  

NASA Technical Reports Server (NTRS)

The differences in the performance of dc motors are evaluated when operating with chopper type controllers, and when operating on direct current. The interactions between the motor and the controller which cause these differences are investigated. Motor-controlled tests provided some of the data the quantified motor efficiency variations for both ripple free and chopper modes of operation.

Mcbrien, E. F.; Tryon, H. B.

1982-01-01

320

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

NASA Technical Reports Server (NTRS)

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.

1982-01-01

321

Artificial neural network based fault identification scheme implementation for a three-phase induction motor.  

PubMed

This paper presents results from the implementation and testing of a PC based monitoring and fault identification scheme for a three-phase induction motor using artificial neural networks (ANNs). To accomplish the task, a hardware system is designed and built to acquire three-phase voltages and currents from a 1/3 HP squirrel-cage, three-phase induction motor. A software program is written to read the voltages and currents, which are first used to train a feed-forward neural network structure using the JavaNNS program. The trained network is placed in a LabVIEW based program formula node that monitors the voltages and currents online and displays the fault conditions and turns the motor off. The complete system is successfully tested in real time by creating different faults on the motor. PMID:17336306

Kolla, Sri R; Altman, Shawn D

2007-04-01

322

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

323

Theory and Implementation Biomimetic Motor Controllers  

E-print Network

Theory and Implementation of Biomimetic Motor Controllers Thesis submitted for the degree-library con- troller for simulated swimming robots. This approach scales very well, al- lowing us to solve the discontinuities. We then use this new model to control a simulated robotic finger which spins an object

Todorov, Emanuel

324

A new condition monitoring and fault diagnosis system of induction motors using artificial intelligence algorithms  

Microsoft Academic Search

In this paper, a condition monitoring and fault diagnosis system for induction motors is proposed by integrating artificial intelligence algorithms: principal component analysis (PCA), genetic algorithm (GA) and an artificial neural network (ANN). As main diagnosis media of fault motor, three-direction vibration signals and three-phase stator current signals are selected to measure. Multi-sensor measurement results in lots of data transfer

Tian Han; Bo-Suk Yang; Jong Moon Lee

2005-01-01

325

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

326

Modeling and simulation of inverter-fed induction motors using the natural ABC frame of reference  

NASA Astrophysics Data System (ADS)

A time-domain equivalent network model is presented, in the natural ABC frame of reference, for computer-aided prediction of the performance of dc source-inverter fed induction motor systems and verified experimentally. The choice of this frame of reference for stator representation facilitates the integration of the machine and the electronic dc source-inverter models into one global equivalent network for the entire system. This model is most suited for the propulsion and actuation class of drives in which induction motors may substitute for brushless DC motors as prime movers. The model was used to simulate the performance of a 204-V, 1/3-hp, 60-Hz, 8-pole induction motor-inverter system, and the results were verified by test results obtained in the laboratory. The model was applied to a 440-V, 15-hp, 60-Hz, 8-pole induction motor-inverter system for purposes of evaluating the effects of 180 deg e and 120 deg e inverter conduction periods on the currents and torque profiles of the drive system.

Hijazi, T. M.; Alhamadi, M. A.; Arkadan, A. A.; Demerdash, N. A.

327

Deep networks for motor control functions.  

PubMed

The motor system generates time-varying commands to move our limbs and body. Conventional descriptions of motor control and learning rely on dynamical representations of our body's state (forward and inverse models), and control policies that must be integrated forward to generate feedforward time-varying commands; thus these are representations across space, but not time. Here we examine a new approach that directly represents both time-varying commands and the resulting state trajectories with a function; a representation across space and time. Since the output of this function includes time, it necessarily requires more parameters than a typical dynamical model. To avoid the problems of local minima these extra parameters introduce, we exploit recent advances in machine learning to build our function using a stacked autoencoder, or deep network. With initial and target states as inputs, this deep network can be trained to output an accurate temporal profile of the optimal command and state trajectory for a point-to-point reach of a non-linear limb model, even when influenced by varying force fields. In a manner that mirrors motor babble, the network can also teach itself to learn through trial and error. Lastly, we demonstrate how this network can learn to optimize a cost objective. This functional approach to motor control is a sharp departure from the standard dynamical approach, and may offer new insights into the neural implementation of motor control. PMID:25852530

Berniker, Max; Kording, Konrad P

2015-01-01

328

Deep networks for motor control functions  

PubMed Central

The motor system generates time-varying commands to move our limbs and body. Conventional descriptions of motor control and learning rely on dynamical representations of our body's state (forward and inverse models), and control policies that must be integrated forward to generate feedforward time-varying commands; thus these are representations across space, but not time. Here we examine a new approach that directly represents both time-varying commands and the resulting state trajectories with a function; a representation across space and time. Since the output of this function includes time, it necessarily requires more parameters than a typical dynamical model. To avoid the problems of local minima these extra parameters introduce, we exploit recent advances in machine learning to build our function using a stacked autoencoder, or deep network. With initial and target states as inputs, this deep network can be trained to output an accurate temporal profile of the optimal command and state trajectory for a point-to-point reach of a non-linear limb model, even when influenced by varying force fields. In a manner that mirrors motor babble, the network can also teach itself to learn through trial and error. Lastly, we demonstrate how this network can learn to optimize a cost objective. This functional approach to motor control is a sharp departure from the standard dynamical approach, and may offer new insights into the neural implementation of motor control. PMID:25852530

Berniker, Max; Kording, Konrad P.

2015-01-01

329

A Control Method for Asynchronous Motor Based on Stator Current Vector Orientation  

Microsoft Academic Search

The stator flux model is different at high speed and low speed for the direct torque control (DTC), so the structure of DTC system is complex. Aiming at this issue, a new scheme of induction motor drive is proposed. The core idea is controlling the angle between the stator current vector and the rotor flux vector. It doesn't need the

Jiaquan Lin; Yi Zang; Jun Zhang; Xu Wang; Zongfu Liu

2006-01-01

330

Speed control of brushless DC motors using emotional intelligent controller  

Microsoft Academic Search

This paper presents an improved emotional controller for brushless DC motor (BLDC) drive. The proposed controller is called brain emotional learning based intelligent controller (BELBIC). The utilization of the new controller is based on the emotion processing mechanism in brain. This intelligent control is inspired by the limbic system of mammalian brain, especially amygdala. The controller is successfully implemented in

E. Daryabeigi; H. Sadeghi; G. R. Arab Markadeh; C. Lucas

2010-01-01

331

Dual-Three Phase Induction Machine Drives Control—A Survey  

NASA Astrophysics Data System (ADS)

The paper aims to perform an overview on the state-of-the-art in the control of multi-phase drives employing dual-three phase induction machines. In particular, the paper is focused on modeling aspects, Pulse-Width Modulation (PWM) techniques for Voltage Source Inverters (VSI), Field Oriented Control (FOC) and Direct Torque Control (DTC) strategies for dual-three phase induction machines. Furthermore, the paper briefly presents the advantages of dual-three phase induction motor drives over the conventional three-phase drives and the different applications reported in the literature.

Bojoi, Radu; Farina, Francesco; Profumo, Francesco; Tenconi, Alberto

332

Nature of Motor Control: Perspectives and Issues  

PubMed Central

Four perspectives on motor control provide the framework for developing a comprehensive theory of motor control in biological systems. The four perspectives, of decreasing orthodoxy, are distinguished by their sources of inspiration: neuroanatomy, robotics, self-organization, and ecological realities. Twelve major issues that commonly constrain (either explicitly or implicitly) the understanding of the control and coordination of movement are identified and evaluated within the framework of the four perspectives. The issues are as follows: (1) Is control strictly neural? (2) Is there a divide between planning and execution? (3) Does control entail a frequently involved knowledgeable executive? (4) Do analytical internal models mediate control? (5) Is anticipation necessarily model dependent? (6) Are movements preassembled? (7) Are the participating components context independent? (8) Is force transmission strictly myotendinous? (9) Is afference a matter of local linear signaling? (10) Is neural noise an impediment? (11) Do standard variables (of mechanics and physiology) suffice? (12) Is the organization of control hierarchical? PMID:19227497

Turvey, M. T.; Fonseca, Sergio

2013-01-01

333

A sliding mode control associated to the field-oriented control of asynchronous motor supplied by photovoltaic solar energy  

Microsoft Academic Search

The aims of this work, is the survey of the design and application of speed and flux sliding mode controllers for vector control of an induction motor powered by a solar photovoltaic energy. The solar photovoltaic energy nowadays, is one of the renewable energies sources present in various domains of applications. Moreover, the photovoltaic generator (GPV) output voltage depends of

L. Barazane; S. Kharzi; A. Malek; C. Larbès

2008-01-01

334

Servo and Motor Controller Date: August 10, 2004  

E-print Network

three R/C servomotors and one brushless DC motor. All four motors are controlled by PWM signals sent from a PIC 18F252 micro- controller. The PWM signal to the brushless motor is used to toggle on of the brushless motor with encoder feedback, which is decoded by an HCTL2000 quadrature decoder. An in

Virginia Tech

335

Control system for bearingless motor-generator  

NASA Technical Reports Server (NTRS)

A control system for an electromagnetic rotary drive for bearingless motor-generators comprises a winding configuration comprising a plurality of individual pole pairs through which phase current flows, each phase current producing both a lateral force and a torque. A motor-generator comprises a stator, a rotor supported for movement relative to the stator, and a control system. The motor-generator comprises a winding configuration supported by the stator. The winding configuration comprises at least three pole pairs through which phase current flows resulting in three three-phase systems. Each phase system has a first rotor reference frame axis current that produces a levitating force with no average torque and a second rotor reference frame axis current that produces torque.

Kascak, Peter E. (Inventor); Jansen, Ralph H. (Inventor); Dever, Timothy P. (Inventor)

2010-01-01

336

Microcomputer controlled soft start of motor  

NASA Astrophysics Data System (ADS)

Improving the starting characteristics of a motor is an important part of the motor control. An intelligent soft starting technique was adopted in the starter and used in the present study because of its many advantages compared with conventional starting processes. The core of the soft starter was a single chip (Atmel 8098), its soul was the software and its control object was a Silicon Controlled Rectifier (SCR). The starter achieved not only current-limit starting, but also closed-loop control with a stator current detection circuit. In conclusion, as a result of digital control, starting characteristic can be conveniently chosen according to the load. In addition the starter is of small size, and starting is smooth and reliable due to current feedback.

Gao, Miao; Wang, Yanpeng; Li, Shian

2005-12-01

337

Electromagnetic forces in cage induction motors with rotor eccentricity  

Microsoft Academic Search

The paper deals with the electromagnetic forces in induction machines when the rotor is performing eccentric motion with respect to the stator. The studied eccentric motions of the rigid cage rotor are cylindrical circular whirling motion, symmetric conical whirling motion and the combination of these two basic modes of eccentric motions. The multi-slice, time stepping finite element analysis is used

A. Tenhunen; T. Benedetti; T. P. Holopainen; A. Arkkio

2003-01-01

338

Proposed system model and simulation for three phase induction motor operation with single PV panel  

Microsoft Academic Search

The main objective of this paper is the design and integration of a series of power electronics converters in order to make an induction motor work with a single photovoltaic panel as efficiently as possible. The power electronics converters that we intend to design are a Buck-Boost Converter and a Pulse Width Modulation (PWM) Three-Phase Inverter. The integration of a

Eliud Ortiz-Perez; Ricardo Maldonado; Harry O'Neill; Eduardo I. Ortiz-Rivera

2011-01-01

339

Response of Mains Connected Induction Motors to Low Frequency Voltage Fluctuations from a Flicker Perspective  

Microsoft Academic Search

In radial power systems flicker transfer from a higher voltage level (upstream) to a lower voltage level (down- stream) is seen to be significantly affected by the down- stream load composition. Industrial load bases contain- ing mains connected induction motors are known to be effective in the flicker attenuation process compared to residential load bases containing passive loads. For better

Sankika Tennakoon; Sarath Perera; Duane Robinson

340

The suspension system design of Linear Induction Motor based on hybrid excitation principle  

Microsoft Academic Search

Levitation force is an important technical index of linear induction motor. This paper presents a kind of device which can supply suspension force for hybrid excitation electromagnetic actuators, and calculates the electromagnetic levitation force with 3D field finite element method. The optimization soft package iSIGHT-FD is used to design the structure of the system to gain the largest suspension force.

Feng Li; Hai Tao Yu; Ying Chao Zhuang; Qiang Gao; Ming Qiang Hu

2008-01-01

341

Condition Monitoring of Induction Motors Using Wavelet Based Analysis of Vibration Signals  

Microsoft Academic Search

Condition monitoring of machines has its roots in the human ECG analysis for detecting cardiac arrhythmias. Condition monitoring in industry is desirable for increasing machinery availability, reducing consequential damage, and improving the operational efficiency. This is very significant in industries that use heavy duty machines for various processes. A monstrous three-phase AC induction motor to drive a city water supply

S. Jeevanand; Abraham T. Mathew

2008-01-01

342

Estimation of Static Eccentricity Severity in Induction Motors for On-Line Condition Monitoring  

Microsoft Academic Search

A range of features of sensor signals have been proposed as fault indicators for the detection of rotor eccentricity faults in induction motors. In previous studies, experimental investigation of the behavior of these features in relation to static eccentricity faults have only been performed for a limited range of load levels and fault severities. This has resulted in an incomplete

Jason Grieger; Randy Supangat; Nesimi Ertugrul; Wen L. Soong; Douglas A. Gray; Colin Hansen

2006-01-01

343

Rotor parameter determination of three phase induction motors from a run up to speed test  

Microsoft Academic Search

This paper discusses developments in the implementation of a rapid online parameter determination method for three-phase induction motors without the need to connect a mechanical load or drive to the machine's output shaft. The technique is based on data sampling during a normal run up to speed test. The method has been refined such that even the normal locked rotor

C. Grantham; H. Tabatabaei-Yazdi; M. F. Rahman

1997-01-01

344

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

E-print Network

. These machines find a wide role in most industries in particular in the electric utility industry as auxiliary-off of semiconductor switches. Also, induction motors are required to operate in highly corrosive and dusty, France (e-mail: m.benbouzid@ieee.org). G.B. Kliman is with the Electrical, Computer & Systems Engineering

Paris-Sud XI, Université de

345

Maximum energy efficiency and driving force of linear induction motor in accelerating period  

Microsoft Academic Search

The paper analyzes the effect of secondary resistance on the input and output energy, acceleration energy efficiency, acceleration thrust and acceleration time of a linear induction motor used in high speed trains. A formula is derived for the secondary resistance which maximizes acceleration energy efficiency and thrust or minimizes acceleration time. It is shown that if the exciting reactance is

Takao Hirasa; Sadao Ishikawa

1976-01-01

346

Calculation of Radial Forces in Cage Induction Motors at Start—The Effect of Rotor Differential  

Microsoft Academic Search

In this paper, the radial forces in an induction motor are calculated using finite element analysis. These radial forces (or unbalanced magnetic pull-UMP) are generated when the rotor is eccentric. The work illustrates the importance of higher winding harmonics and rotor differential leakage in the starting UMP. Examples of a 6 pole machine with 26 and 40 bar rotors show

David G. Dorrell; Min-Fu Hsieh

2010-01-01

347

Analysis of electromagnetic forces in a single-sided short rotor linear induction motor  

Microsoft Academic Search

The paper proposes a partly analytical, partly numerical method of evaluating the propulsion, levitation and lateral forces in a single-sided linear induction motor with a rotor of finite length and finite width. A scheme for stabilizing the system laterally is also proposed. The calculated forces are compared with the experimental results on a laboratory sized model at unity slip

K. Venkata Ratnam; A. B. Chattopadhyay

1996-01-01

348

On reducing the vibration and noise level of induction motors with integral and fractional slot windings  

Microsoft Academic Search

Contents The paper presents a method of calculating the radial magnetic forces and pulsating torques in induction motors with integral and fractional stator slot winding and squirrel-cage rotors, which aims on reducing the forces of vibration and the noise level of electromagnetic origin. The method leads to a proper choice of stator and rotor slot numbers and other design data,

J. Hickiewicz; M. Lukaniszyn; S. Szymaniec; P. Wach

1990-01-01

349

Motor Control: Neural Models and System Theory  

E-print Network

Motor Control: Neural Models and System Theory Kenji Doya Information Sciences Division, ATR of Frontier Science, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan Fax: +81-3-5841-8609 E-mail: kimura@crux.t.u-tokyo.ac.jp aiko@crux.t.u-tokyo.ac.jp October 31, 2000 Abstract

Doya, Kenji

350

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

351

New Models for Motor Control  

Microsoft Academic Search

What do a prototype robot (Brooks 1989) and a model for the control of behavioral choice in insects (Altman and Kien 1987a) have in common? And what do they share with a scratching cat (Shadmehr 1989)? The answer is distributed control systems that do not depend on a central command center for the execution of behavioral outputs. The first two

Jennifer S. Altman; Jenny Kien

1989-01-01

352

A Novel Digital Control Technique for Brushless DC Motor Drives  

Microsoft Academic Search

Brushless DC (BLDC) motor drives are continually gaining popularity in motion control applications. Therefore, it is necessary to have a low cost, but effective BLDC motor speed\\/torque regulator. This paper introduces a novel concept for digital control of trapezoidal BLDC motors. The digital controller was implemented via two different methods, namely conduction-angle control and current-mode control. Motor operation is allowed

Fernando Rodriguez; Ali Emadi

2007-01-01

353

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

354

Dual-circuit segmented rail phased induction motor  

SciTech Connect

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

355

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

356

Extended Constant Power Speed Range of the Brushless DC Motor Through Dual Mode Inverter Control  

SciTech Connect

The trapezoidal back electromotive force (emf) brushless direct current (dc) motor (BDCM) with surface-mounted magnets has high-power density and efficiency especially when rare-earth magnet materials are used. Traction applications, such as electric vehicles, could benefit significantly from the use of such motors. Unfortunately, a practical means for driving the motor over a constant power speed ratio (CPSR) of 5:1 or more has not yet been developed. A key feature of these motors is that they have low internal inductance. The phase advance method is effective in controlling the motor power over such a speed range, but the current at high speed may be several times greater than that required at the base speed. The increase in current during high-speed operation is due to the low motor inductance and the action of the bypass diodes of the inverter. The use of such a control would require increased current rating of the inverter semiconductors and additional cooling for the inverter, where the conduction losses increase proportionally with current, and especially for the motor, where the losses increase with the square of the current. The high current problems of phase advance can be mitigated by adding series inductance; however, this reduces power density, requires significant increase in supply voltage, and leaves the CPSR performance of the system highly sensitive to variations in the available voltage. A new inverter topology and control scheme has been developed that can drive low-inductance BDCMs over the CPSR that would be required in electric vehicle applications. This new controller is called the dual-mode inverter control (DMIC). It is shown that the BDCM has an infinite CPSR when it is driven by the DMIC.

Lawler, J.S.

2000-06-23

357

Computation of winding inductances of permanent magnet brushless dc motors with damper windings by energy perturbation  

SciTech Connect

In this first of a set of three companion papers on the modeling of permanent magnet brushless dc motors, including rotor damping effects, a method is presented for the calculation of motor winding inductances. This includes damping effects due to metallic retainment sleeves and intentionally introduced damper bar (amortisseur) windings. The inductance computation method makes use of the combined energy perturbation concept and finite element field solutions. These parameters are the ones necessary is a state model presented here for the prediction of the dynamic performance of such motors with rotor damping. This modeling approach accounts for all saliency effects, and is entirely carried out in the natural abc frame of reference. Thus it facilitates the process of integration of the modeling of the motor and its associated power electronics. The approach is most effective in the design of damper bar systems for enhancement of the performance of such motors, as demonstrated in application of this approach to a 15 hp, 120 volt, 6-pole samarium-cobalt permanent magnet brushless dc motor given in this paper and two other companion papers.

Demerdash, N.A.; Hijazi, T.M.; Arkadan, A.A.

1988-01-01

358

PRECISION CONTROL OF LINEAR MOTOR DRIVEN HIGH-SPEED/ACCELERATION  

E-print Network

PRECISION CONTROL OF LINEAR MOTOR DRIVEN HIGH-SPEED/ACCELERATION ELECTRO-MECHANICAL SYSTEMS Bin Yao, IN47907 byao@purdue.edu http://widget.ecn.purdue.edu/~byao #12;LINEAR MOTOR POSITIONING STAGE #12 resolution, measurement noise, calculation time, and frame stiffness LINEAR MOTOR DRIVE SYSTEMSLINEAR MOTOR

Yao, Bin

359

Field oriented control of an asynchronous motor with a very wide region of flux weakening  

Microsoft Academic Search

In the first part of the paper, the torque capability of an inverter-fed saturated induction motor is determined. The maximum torque being available for short-time duty and the corresponding flux are calculated considering the limitations of the current and the voltage only. The flux weakening region consists of two parts which require different control strategies. At partial load the efficiency

J. Wiesing; H. Grotstollen

1992-01-01

360

Optimizing current control performance in double winding asynchronous motors in large power inverter drives  

Microsoft Academic Search

The operation of AC drives in applications requiring high overload capability imposes hard working conditions on the electronic switching devices. The use of induction motors with two stator windings, fed by two inverter modules, allows large power rating in variable speed drives for high performance applications. This paper shows the structure and the main features of a field-oriented control for

Luca De Camillis; Marco Matuonto; Antonello Monti; Alberto Vignati

2001-01-01

361

Embedded Control and Diagnostics Algorithm with Fault Prediction and Analysis of AC Induction Machines  

Microsoft Academic Search

Fault diagnostics of induction machines have been widely researched however, an integrated motor control with automated fault detection, prevention and condition monitoring is still missing. Condition monitoring can reduce the downtime of the processes and increase the maximum interval between failures, thus minimizing the number and cost of unscheduled maintenances, which is highly beneficial. Also an integrated approach can reduce

ABDUL KADIR; OMAR AL-AYASRAH; TALIB ALUKAIDEY

2005-01-01

362

Pulsewidth Modulation Control of Brushless DC Motors for Robotic Applications  

Microsoft Academic Search

Pulsewidth modulation (PWM) control of brushless dc motors is implemented with digital servo mechanisms for robotic applications. Under the assumption that the pulse period is much smaller than the motor time-constants, the motor is modeled by a discrete-time transfer function with the pulsewidth playing the role of the control signal. This model enables the application of classical linear control engineering

Patrick F. Muir; Charles P. Neuman

1985-01-01

363

Integrated Control of Axonemal Dynein AAA+ Motors  

PubMed Central

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.

2012-01-01

364

Modeling of VSI fed induction motor-a systematic and general approach  

Microsoft Academic Search

For the investigation of AC motor drives, either in simulation or in control, an appropriate mathematical model is required. The modeling approach of integration of a motor-inverter system is proposed in the paper. With the topological graph of the inverter circuit and the primitive connection matrix and the transmission matrix of the graph, the restraint equations and the output equations

Zhifeng Zhuang; Minxun Chen

1992-01-01

365

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.

366

Split-phase induction motor operation from PWM voltage source inverter  

Microsoft Academic Search

The operation of split-phase induction motors from pulse-width modulated (PWM) voltage source inverters is examined. Splitting the phase windings leads to reduced voltage ratings for the inverter switches. As compared with seven positions for the space phasor of voltage in three-phase machines, 48 different locations bounded by a 12-sided polygon are possible in the split-phase machine. Based on space phasor

K. Gopakumar; V. T. Ranganathan; S. R. Bhat

1993-01-01

367

Steady State Performance of Series DC Motor Powered by Wind Driven Self-Excited Induction Generator  

Microsoft Academic Search

In this paper the steady-state performance of a series DC motor powered by a self-excited induction generator, through a bridge rectifier, and loaded by ventilator load is analyzed. The results help in designing an efficient integrated wind-solar energy system. Résumé - Dans cet article l'etude de la performance des moteurs DC series en regime stationnaire alimentes par un generateur a

Yaser Anagreh

2001-01-01

368

Induction Motor Diagnosis Based on a Transient Current Analytic Wavelet Transform via Frequency B-Splines  

Microsoft Academic Search

In this paper, a new induction motor diagnosis methodology is proposed. The approach is based on obtaining a 2-D time-frequency plot representing the time-frequency evo- lution of the main components in an electrical machine tran- sient current. The identification of characteristic patterns in the time-frequency plane caused by many of the fault-related components enables a reliable machine diagnosis. Unlike other

Joan Pons-Llinares; Jose A. Antonino-Daviu; Martin Riera-Guasp; Manuel Pineda-Sanchez; Vicente Climente-Alarcon

2011-01-01

369

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

370

Sensorless very low-speed and zero-speed estimations with online rotor resistance estimation of induction motor without signal injection  

Microsoft Academic Search

In the speed-sensorless control of the induction motor, the machine parameters (especially rotor resistance R2) have a strong influence on the speed estimation. It is known that the simultaneous estimation of speed and R2 is impossible in the slip-frequency-type vector control, because the rotor flux is constant. In addition, the output voltage error due to the deadtime and the voltage

K. Akatsu; A. Kawamura

2000-01-01

371

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

372

An Improved Sensorless DTC Scheme for EV Induction Motors  

E-print Network

the vehicle dynamics. Simulations have been firstly carried out on a test vehicle propelled by a 37-k, direct torque control, vehicle dynamics. I. INTRODUCTION Recently a lot of effort was focused towards

Paris-Sud XI, Université de

373

Magnetic rotor flux observer of induction motors with fast convergence and less transient oscillation  

NASA Astrophysics Data System (ADS)

This paper presents an observer design for the estimation of magnetic rotor flux of induction motors. We characterize the class of MIMO induction motor systems that consists of the linear observable and the nonlinear part with a block triangular structure. The similarity transformation that plays an important role in proving the convergence of the proposed observer is generalized to the systems. Since the gain of the proposed observer minimizes a nonlinear part of the system to suppress for the stability of the error dynamics, it improves the transient performance of the high gain observer. Moreover, by using the generalized similarity transformation, it is shown that under some observability and boundedness conditions, the proposed observer guarantees the global exponential convergence to zero of the estimation error. Since the proposed scheme minimizes the nonlinearity of an induction motor system, it improves the transient performance of the observer and guarantees the global exponential convergence to zero of the estimation error. The estimation results of magnetic rotor fluxes through experiments are shown and it is presented that the proposed magnetic flux observer exhibits less transient oscillation and faster convergence time than the general observer.

Park, Chang-Woo; Hwang, Jung-Hoon

2013-03-01

374

Summary of electric vehicle dc motor-controller tests  

SciTech Connect

Available performance data for production motors are usually of marginal value to the electric vehicle designer. To provide at least a partial remedy to this situation, tests of typical dc propulsion motors and controllers were conducted as part of the DOE Electric Vehicle Program. The objectives of this program were to evaluate the differences in the performance of dc motors when operating with chopper-type controllers and when operating on direct current; and to gain an understanding of the interactions between the motor and the controller which cause these differences. Toward this end, motor-controller tests performed by the NASA Lewis Research Center provided some of the first published data that quantified motor efficiency variations for both ripple-free (straight dc) and chopper modes of operation. Test and analysis work at the University of Pittsburgh explored motor-controller relationships in greater depth. And to provide additional data, 3E Vehicles tested two small motors, both on a dynamometer and in a vehicle, and the Eaton Corporation tested larger motors, using sophisticated instrumentation and digital processing techniques. All the motors tested were direct-current types. Of the separately excited types, seven were series wound and two were shunt wound. One self-excited permanent magnet type was also tested. Four of the series wound motors used brush shifting to obtain good commutation. In almost all cases, controller limitations constrained the test envelope so that the full capability of the motors could not be explored.

McBrien, E F; Tryon, H B

1982-09-01

375

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

376

High-Frequency Modeling of the Long-Cable-Fed Induction Motor Drive System Using TLM Approach for Predicting Overvoltage Transients  

Microsoft Academic Search

Induction motor drive systems fed with cables are widely used in many industrial applications. Accurate prediction of motor terminal overvoltage, caused by impedance mismatch between the long cable and the motor, plays an important role for motor dielectric insulation and optimal design of dv\\/dt filters. In this paper, a novel modeling methodology for the investigation of long-cable-fed induction motor drive

Liwei Wang; Carl Ngai-Man Ho; Francisco Canales; Juri Jatskevich

2010-01-01

377

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

378

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

379

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

380

Rotor broken bar detection and diagnosis in induction motors using stator current signature analysis and fuzzy logic  

Microsoft Academic Search

This paper presents a study and the practical implementation of a system for the detection and diagnosis of broken rotor bars in electrical induction motors. Motor current signature analysis (MCSA) and fuzzy logic techniques are utilized in order to achieve that. Initially, a brief description of the MCSA is introduced. The causes of broken rotor bars are discussed and characterized

Luis Alberto Pereira; Daniel da Silva Gazzana

2004-01-01

381

The Basal Ganglia and Adaptive Motor Control  

NASA Astrophysics Data System (ADS)

The basal ganglia are neural structures within the motor and cognitive control circuits in the mammalian forebrain and are interconnected with the neocortex by multiple loops. Dysfunction in these parallel loops caused by damage to the striatum results in major defects in voluntary movement, exemplified in Parkinson's disease and Huntington's disease. These parallel loops have a distributed modular architecture resembling local expert architectures of computational learning models. During sensorimotor learning, such distributed networks may be coordinated by widely spaced striatal interneurons that acquire response properties on the basis of experienced reward.

Graybiel, Ann M.; Aosaki, Toshihiko; Flaherty, Alice W.; Kimura, Minoru

1994-09-01

382

A centre for accommodative vergence motor control  

NASA Technical Reports Server (NTRS)

Latencies in accommodation, accommodative-vergence, and pupil-diameter responses to changing accommodation stimuli, as well as latencies in pupil response to light-intensity changes were measured. From the information obtained, a block diagram has been derived that uses the least number of blocks for representing the accommodation, accommodative-vergence, and pupil systems. The signal transmission delays over the various circuits of the model have been determined and compared to known experimental physiological-delay data. The results suggest the existence of a motor center that controls the accommodative vergence and is completely independent of the accommodation system.

Wilson, D.

1973-01-01

383

Motor Control Abnormalities in Parkinson’s Disease  

PubMed Central

The primary manifestations of Parkinson’s disease are abnormalities of movement, including movement slowness, difficulties with gait and balance, and tremor. We know a considerable amount about the abnormalities of neuronal and muscle activity that correlate with these symptoms. Motor symptoms can also be described in terms of motor control, a level of description that explains how movement variables, such as a limb’s position and speed, are controlled and coordinated. Understanding motor symptoms as motor control abnormalities means to identify how the disease disrupts normal control processes. In the case of Parkinson’s disease, movement slowness, for example, would be explained by a disruption of the control processes that determine normal movement speed. Two long-term benefits of understanding the motor control basis of motor symptoms include the future design of neural prostheses to replace the function of damaged basal ganglia circuits, and the rational design of rehabilitation strategies. This type of understanding, however, remains limited, partly because of limitations in our knowledge of normal motor control. In this article, we review the concept of motor control and describe a few motor symptoms that illustrate the challenges in understanding such symptoms as motor control abnormalities. PMID:22675667

Mazzoni, Pietro; Shabbott, Britne; Cortés, Juan Camilo

2012-01-01

384

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

385

A comparison of some condition monitoring techniques for the detection of defect in induction motor ball bearings  

Microsoft Academic Search

Rolling element bearings are critical components in induction motors and monitoring their condition is important to avoid failures. Several condition monitoring techniques for the bearings are available. Out of these stator current monitoring is a relatively new technique. Vibration, stator current, acoustic emission and shock pulse methods (SPMs) for the detection of a defect in the outer race of induction

N. Tandon; G. S. Yadava; K. M. Ramakrishna

2007-01-01

386

A Position Sensorless Control Method for SRM Based on Variation of Phase Inductance  

NASA Astrophysics Data System (ADS)

Switched reluctance motor (SRM) drives are suitable for variable speed industrial applications because of the simple structure and high-speed capability. However, it is necessary to detect the rotor position with a position sensor attached to the motor shaft. The use of the sensor increases the cost of the drive system and machine size, and furthermore the reliability of the system is reduced. Therefore, several approaches to eliminate the position sensor have already been reported. In this paper, a position sensorless control method based on the variation of the phase inductance is described. The phase inductance regularly varies with the rotor position. The SRM is controlled without the position sensor using the de-fluxing period and the phase inductance. The turn-off timing is determined by computing the difference of angle between the sampling point and the aligned point and the variation of angle during the de-fluxing period. In the magnetic saturation region, the phase inductance at the current when the effect of the saturation starts is computed and the sensorless control can be carried out using this inductance. Experimental results show that the SRM is well controlled without the position sensor using the proposed method.

Komatsuzaki, Akitomo; Miki, Ichiro

387

Ultrasonic motors: Their models, drives, controls and applications  

Microsoft Academic Search

In the last decades piezoelectrically driven ultrasonic motors have become alternative actuators to the conventional electromagnetic\\u000a motors especially for precise and accurate servo positioning applications. Different types of ultrasonic motors have been\\u000a constructed and manufactured. Several drive systems have been designed, implemented and proposed for these motors. A variety\\u000a of control techniques have been applied to them. The research given

Erdal Bekiroglu

2008-01-01

388

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

389

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

NSDL National Science Digital Library

This three credit course offered at Macomb Community College provides an introduction to alternating current (AC) motors, AC motor controls, and AC motor applications to battery 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 drive vehicles 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 MCC’s Electric Vehicle Development Technology 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.

2013-04-18

390

NEURAL NETWORK PREDICTIVE CONTROL OF A SERVOVALVE DRIVEN HYDRAULIC MOTOR  

Microsoft Academic Search

This study considers the application of neural networks to the control of a servovalve-driven hydraulic motor. Performance of the neural network predictive control algorithm is analyzed under various system parameters. Simulations show that, neural network predictive control is successful for speed tracking of hydraulic motor even with different values of moment of inertia.

Ilyas Istif; Elif Kongar

391

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

392

Linearity, motor primitives and low-dimensionality in the spinal organization of motor control  

E-print Network

The typical biological system is nonlinear, high-dimensional and highly redundant, all of which are burdens on controller design. Yet despite these complications, the central nervous system is able to control motor systems ...

Berniker, Max (Max Sam), 1971-

2005-01-01

393

Real Time Flux Control in PM Motors  

SciTech Connect

Significant research at the Oak Ridge National Laboratory (ORNL) Power Electronics and Electric Machinery Research Center (PEEMRC) is being conducted to develop ways to increase (1) torque, (2) speed range, and (3) efficiency of traction electric motors for hybrid electric vehicles (HEV) within existing current and voltage bounds. Current is limited by the inverter semiconductor devices' capability and voltage is limited by the stator wire insulation's ability to withstand the maximum back-electromotive force (emf), which occurs at the upper end of the speed range. One research track has been to explore ways to control the path and magnitude of magnetic flux while the motor is operating. The phrase, real time flux control (RTFC), refers to this mode of operation in which system parameters are changed while the motor is operating to improve its performance and speed range. RTFC has potential to meet an increased torque demand by introducing additional flux through the main air gap from an external source. It can augment the speed range by diverting flux away from the main air gap to reduce back-emf at high speeds. Conventional RTFC technology is known as vector control [1]. Vector control decomposes the stator current into two components; one that produces torque and a second that opposes (weakens) the magnetic field generated by the rotor, thereby requiring more overall stator current and reducing the efficiency. Efficiency can be improved by selecting a RTFC method that reduces the back-emf without increasing the average current. This favors methods that use pulse currents or very low currents to achieve field weakening. Foremost in ORNL's effort to develop flux control is the work of J. S. Hsu. Early research [2,3] introduced direct control of air-gap flux in permanent magnet (PM) machines and demonstrated it with a flux-controlled generator. The configuration eliminates the problem of demagnetization because it diverts all the flux from the magnets instead of trying to oppose it. It is robust and could be particularly useful for PM generators and electric vehicle drives. Recent efforts have introduced a brushless machine that transfers a magneto-motive force (MMF) generated by a stationary excitation coil to the rotor [4]. Although a conventional PM machine may be field weakened using vector control, the air-gap flux density cannot be effectively enhanced. In Hsu's new machine, the magnetic field generated by the rotor's PM may be augmented by the field from the stationery excitation coil and channeled with flux guides to its desired destination to enhance the air-gap flux that produces torque. The magnetic field can also be weakened by reversing the current in the stationary excitation winding. A patent for advanced technology in this area is pending. Several additional RTFC methods have been discussed in open literature. These include methods of changing the number of poles by magnetizing and demagnetizing the magnets poles with pulses of current corresponding to direct-axis (d-axis) current of vector control [5,6], changing the number of stator coils [7], and controlling the air gap [8]. Test experience has shown that the magnet strengths may vary and weaken naturally as rotor temperature increases suggesting that careful control of the rotor temperature, which is no easy task, could yield another method of RTFC. The purpose of this report is to (1) examine the interaction of rotor and stator flux with regard to RTFC, (2) review and summarize the status of RTFC technology, and (3) compare and evaluate methods for RTFC with respect to maturity, advantages and limitations, deployment difficulty and relative complexity.

Otaduy, P.J.

2005-09-27

394

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

395

An AC motor drive with power factor control for low cost applications  

NASA Astrophysics Data System (ADS)

The front-end rectifier followed by a pulse-width modulated voltage source inverter (PWM-VSI) has been a well-established power converter configuration for many industrial drives. The increasing costs on the utility usage, due to power quality regulations, and the need to improve the VA capacity of systems, e.g. off-shore drilling rigs, have increased the interest in the development of power electronic equipment with power factor control capability. Electrical motors consume a large amount of the available electrical energy, and this energy tends to increase due to the massive emerging applications of electrical motor drives in appliances and in industrial processes. Therefore, the improvement of the power factor of these low power drive systems, usually in the range from fractional horse-power (hp) to 1 hp, is of particular interest. For these power ratings, the system configuration usually comprises a single-phase to three-phase type of converter with additional circuitry for power factor control (PFC). However, this approach has an impact on the system cost and packaging. In this work, a new concept of integrating motor and power factor controls by using a single-phase to three-phase DSP based six-switch converter topology is presented. Unlike other configurations using extra switch(es) and/or extra boost inductor, in this circuit the boost action, for input current shaping, is done by the motor leakage inductances. The power factor control and inverter operation are performed by applying two modulating signals to the SPWM control logic of the converter. In this dissertation, the converter operation and a proposed control strategy will be explained. Simulation and experimental results for a DSP based induction motor drive will be provided as proof of concept. The feasibility and potential of this configuration for ac motor drive applications will be established. The impact of this scheme on the machine operation will also be discussed.

Bellar, Maria Dias

2000-10-01

396

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

397

Hybrid traction drive with symmetrical split-phase motor controlled by synchronized PWM  

Microsoft Academic Search

This paper presents results of application of a new method of synchronized pulsewidth modulation (PWM) for control of symmetrical six-phase traction drives with two DC sources. The six-phase (dual three-phase) drive system includes in this case a symmetrical induction motor which has two sets of windings spatially shifted by 60 electrical degrees. Analysis of operation of the symmetrical six-phase system

G. Griva; V. Oleschuk; F. Profumo

2008-01-01

398

Space vector PWM control of a split-phase induction machine using the vector classification technique  

Microsoft Academic Search

A new and effective space vector PWM control of six-phase voltage source inverters fed split-phase induction motors is presented in this paper. The proposed approach is based on three-phase space vector modulation (SVM) techniques, thereby, it inherently eliminates the 5th, 7th, 17th, 19th, …harmonic currents without extensive computations. Furthermore, the paper utilizes a classification algorithm for the implementation of the

A. R. Bakhshai; G. Joos; H. Jin

1998-01-01

399

Preferred track: Speech Motor Control Title: Specificity of speech sensori-motor learning  

E-print Network

COVER PAGE Preferred track: Speech Motor Control Title: Specificity of speech sensori of speech production. Current research focuses on speech sensori-motor learning and its consequences for speech perception. David Ostry Professor at McGill University and Senior Scientist at Haskins

Paris-Sud XI, Université de

400

26. LOOKING SOUTH AT THE MOTOR CONTROL SWITCHING PANEL FOR ...  

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

26. LOOKING SOUTH AT THE MOTOR CONTROL SWITCHING PANEL FOR BASIC OXYGEN FURNACE No. 2 IN THE BOP SHOP'S MOTOR CONTROL CENTER No. 2 ON THE GROUND FLOOR OF THE FURNACE AISLE. - U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monongahela River, Duquesne, Allegheny County, PA

401

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 packet dropout. Based on this model, the ECS is described as a two-state asynchronous dynamical system

Paris-Sud XI, Université de

402

Book Review: Human Robotics: Neuromechanics and Motor Control  

E-print Network

Book Review: Human Robotics: Neuromechanics and Motor Control Etienne Burdet, David W. Franklin of the muscle-tendon complex. Here, the role of muscles as a source of impedance in addition to force impedance (i.e., the resistance to movement) in motor control, and how impedance can be modulated

Franklin, David

403

A microcontroller-based induction motor drive system using variable structure strategy with decoupling  

Microsoft Academic Search

The sliding-mode control concept is applied in the outer loop of a speed drive system utilizing a series-connected wound rotor induction machine (SCWRIM). A design procedure is outlined for the sliding-mode speed controller. The methods of decoupling and torque linearization for the SCWRIM are derived using the field-orientation as well as the torque angle control concepts. Sliding-mode control with cascaded

E. Y. Y. Ho; P. C. Sen

1990-01-01

404

Design of BLDC motor controller for electric power wheelchair  

Microsoft Academic Search

We introduce a design and implementation of BLDC motor controller for an electric power wheelchair. The control architecture consists of two layers of feedback control, namely the wheelchair posture control and the wheel velocity control. In the higher level of control architecture, the posture controller works as a reference velocity generator for two wheels. We realize the joystick interface and

Jun-Uk Chu; In-Hyuk Moon; Gi-Won Choi; Jei-Cheong Ryu; Mu-Seong Mun

2004-01-01

405

Electrifying the motor engram: effects of tDCS on motor learning and control.  

PubMed

Learning to control our movements is accompanied by neuroplasticity of motor areas of the brain. The mechanisms of neuroplasticity are diverse and produce what is referred to as the motor engram, i.e., the neural trace of the motor memory. Transcranial direct current stimulation (tDCS) alters the neural and behavioral correlates of motor learning, but its precise influence on the motor engram is unknown. In this review, we summarize the effects of tDCS on neural activity and suggest a few key principles: (1) Firing rates are increased by anodal polarization and decreased by cathodal polarization, (2) anodal polarization strengthens newly formed associations, and (3) polarization modulates the memory of new/preferred firing patterns. With these principles in mind, we review the effects of tDCS on motor control, motor learning, and clinical applications. The increased spontaneous and evoked firing rates may account for the modulation of dexterity in non-learning tasks by tDCS. The facilitation of new association may account for the effect of tDCS on learning in sequence tasks while the ability of tDCS to strengthen memories of new firing patterns may underlie the effect of tDCS on consolidation of skills. We then describe the mechanisms of neuroplasticity of motor cortical areas and how they might be influenced by tDCS. We end with current challenges for the fields of brain stimulation and motor learning. PMID:25200178

Orban de Xivry, Jean-Jacques; Shadmehr, Reza

2014-11-01

406

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

407

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

408

Maximum Efficiency Operation of a Single Stage Inverter Fed Induction Motor PV Water Pumping System  

Microsoft Academic Search

Photovoltaic (PV) water pumping systems have been increasingly popular in remote areas where grid is not accessible or is too costly to install. These systems are mostly used for agriculture and household purposes. Generally, such systems use permanent magnet dc motors because of their simple circuit configuration and control strategy. However these systems require frequent maintenance. On the other hand,

A. B. Raju; S. Ramesh Karnik; Rohini Jyoti

2008-01-01

409

Control design implementation for Sawyer motors used in manufacturing systems  

Microsoft Academic Search

In this paper, hardware integration and control design for a dual-axis linear stepper (Sawyer) motor are addressed. In particular, the Sawyer motor used in the Yaskawa\\/MotoMan manufacturing system which is utilized in various applications such as assembly, packaging, sorting, and probing, is considered. These motors are equipped with four optical sensors with a position resolution of 0.25 microns. We develop

P. Krishnamurthy; F. Khorrami; T. L. Ng; I. Cherepinsky

2005-01-01

410

Simple strategy to recovery energy during stopping period in large high-inertia line-fed induction motor driven systems  

Microsoft Academic Search

The three-phase, squirrel-cage, induction motor (IM) is the most used type of electrical motor in industry. Nowadays, energy recovering during deceleration or breaking periods is a well-explored technique in IMs fed by converters, incorporating special rectifier\\/inverter input stages, allowing energy to be injected back into the power grid. However, for line-fed IMs, during stopping or deceleration period, after disconnecting the

F. J. T. E. Ferreira; M. V. Cistelecan; A. T. de Almeida; G. Baoming

2008-01-01

411

Impact of steady-state voltage supply anomalies on three-phase squirrel-cage induction motors  

Microsoft Academic Search

In this paper, the consequences of steady-state voltage supply anomalies on the behavior, losses and operating limits of low-power, low-voltage, three-phase, squirrel-cage induction motors is presented. The study is mainly based on simulations and previously published works, but experimental results are also presented. The well-known motor derating curves proposed by NEMA are questioned. It is demonstrated that they are too

Fernando J. T. E. Ferreira; Aníbal T. de Almeida; Wim Deprez; Ronnie Belmans; Ge Baoming

2007-01-01

412

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-Valérie Boureau; Rachid Touzani

2001-01-01

413

Directed induction of functional motor neuron-like cells from genetically engineered human mesenchymal stem cells.  

PubMed

Cell replacement using stem cells is a promising therapeutic approach to treat degenerative motor neuron (MN) disorders, such as amyotrophic lateral sclerosis and spinal cord injury. Human bone marrow-derived mesenchymal stem cells (hMSCs) are a desirable cell source for autologous cell replacement therapy to treat nervous system injury due to their plasticity, low immunogenicity, and a lower risk of tumor formation than embryonic stem cells. However, hMSCs are inefficient with regards to differentiating into MN-like cells. To solve this limitation, we genetically engineered hMSCs to express MN-associated transcription factors, Olig2 and Hb9, and then treat the hMSCs expressing Olig2 and Hb9 with optimal MN induction medium (MNIM). This method of induction led to higher expression (>30% of total cells) of MN markers. Electrophysiological data revealed that the induced hMSCs had the excitable properties of neurons and were able to form functional connections with muscle fibers in vitro. Furthermore, when the induced hMSCs were transplanted into an injured organotypic rat spinal cord slice culture, an ex vivo model of spinal cord injury, they exhibited characteristics of MNs. The data strongly suggest that induced Olig2/Hb9-expressing hMSCs were clearly reprogrammed and directed toward a MN-like lineage. We propose that methods to induce Olig2 and Hb9, followed by further induction with MNIM have therapeutic potential for autologous cell replacement therapy to treat degenerative MN disorders. PMID:22496912

Park, Hwan-Woo; Cho, Jung-Sun; Park, Chul-Kyu; Jung, Sung Jun; Park, Chang-Hwan; Lee, Shin-Jae; Oh, Seog Bae; Park, Young-Seok; Chang, Mi-Sook

2012-01-01

414

Real-Time Simulation of Permanent Magnet Motor Drive on FPGA Chip for High-Bandwidth Controller Tests and Validation  

Microsoft Academic Search

This paper presents a real-time simulator of a permanent magnet synchronous motor (PMSM) drive implemented on an FPGA card. Real-time simulation of PMSM drives enables rapid deployment and thorough testing of efficient control strategies for vehicular or industrial applications. The PMSM model is based on Park transform with a reference frame on the rotor and assumes sinusoidal flux induction. The

Christian Dufour; S. Abourida; J. Belanger

2006-01-01

415

Robust control of linear ceramic motor drive with LLCC resonant technique.  

PubMed

This study presents a robust control system for a linear ceramic motor (LCM) that is driven by a high-frequency voltage source inverter using two-inductance two-capacitance (LLCC) resonant technique. The structure and driving principle of the LCM are introduced. Because the dynamic characteristics and motor parameters of the LCM are nonlinear and time varying, a robust control system is designed based on the hypothetical dynamic model to achieve high-precision position control. The presentation of robust control for the LCM drive system is divided into three parts, which comprise state feedback controller, feed-forward controller, and uncertainty controller. The adaptation laws of control gains in the robust control system are derived in the sense of Lyapunov stability theorem such that the stability of the control system can be guaranteed. It not only has the learning ability similar to intelligent control, but also its control framework is more simple than intelligent control. With the proposed robust control system, the controlled LCM drive possesses the advantages of good tracking control performance and robustness to uncertainties. The effectiveness of the proposed robust control system is verified by experimental results in the presence of uncertainties. In addition, the advantages of the proposed control system are indicated in comparison with the traditional integral-proportional (IP) position control system. PMID:12894924

Wai, Rong-Jong

2003-07-01

416

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

SciTech Connect

It is well known that the ability of the permanent magnet synchronous machine (PMSM) to operate over a wide constant power speed range (CPSR) is dependent upon the machine inductance [1,2,3,4,5]. Early approaches for extending CPSR operation included adding supplementary inductance in series with the motor [1] and the use of anti-parallel thyristor pairs in series with the motor-phase windings [5]. The increased inductance method is compatible with a voltage-source inverter (VSI) controlled by pulse-width modulation (PWM) which is called the conventional phase advance (CPA) method. The thyristor method has been called the dual mode inverter control (DMIC). Neither of these techniques has met with wide acceptance since they both add cost to the drive system and have not been shown to have an attractive cost/benefit ratio. Recently a method has been developed to use fractional-slot concentrated windings to significantly increase the machine inductance [6]. This latest approach has the potential to make the PMSM compatible with CPA without supplemental external inductance. If the performance of such drive is acceptable, then the method may make the PMSM an attractive option for traction applications requiring a wide CPSR. A 30 pole, 6 kW, 6000 maximum revolutions per minute (rpm) prototype of the fractional-slot PMSM design has been developed [7]. This machine has significantly more inductance than is typical of regular PMSMs. The prototype is to be delivered in late 2005 to the Oak Ridge National Laboratory (ORNL) for testing and development of a suitable controller. In advance of the test/control development effort, ORNL has used the PMSM models developed over a number of previous studies to study the steady-state performance of high-inductance PMSM machines with a view towards control issues. The detailed steady-state model developed includes all motor and inverter-loss mechanisms and will be useful in assessing the performance of the dynamic controller to be developed in future work. This report documents the results of this preliminary investigation.

Lawler, J.S.

2005-12-21

417

Research into wide speed range control of a TORUS motor  

SciTech Connect

Toroidal stator permanent magnet brushless DC machines are novel, double-sided, axial-flux, disc type machines with high power to weight ratio and high efficiency. A TORUS motor works very much like a separately excited DC motor with very low armature reaction. To extend the TORUS motor into the electrical traction field, a method for wide speed range is proposed by weakening the flux created by the permanent magnets. According to this scheme, experiments and modelling of the motor are carried out. The results prove the assumption is feasible. The implementation of this project is carried out with an improved IGBT inverter using a Flight-68K microprocessor as controller.

Pan, H.; Renfrew, A.C. [UMIST, Manchester (United Kingdom)

1995-12-31

418

Recurrent neural network control for LCC-resonant ultrasonic motor drive.  

PubMed

A newly designed driving circuit for the traveling wave-type ultrasonic motor (USM), which consists of a push-pull DC-DC power converter and a two-phase voltage source inverter using one inductance and two capacitances (LCC) resonant technique, is presented in this study. Moreover, because the dynamic characteristics of the USM are difficult to obtain and the motor parameters are time varying, a recurrent neural network (RNN) controller is proposed to control the USM drive system. In the proposed controller, the dynamic backpropagation algorithm is adopted to train the RNN on-line using the proposed delta adaptation law. Furthermore, to guarantee the convergence of tracking error, analytical methods based on a discrete-type Lyapunov function are proposed to determine the varied learning rates for the training of the RNN. Finally, the effectiveness of the RNN-controlled USM drive system is demonstrated by some experimental results. PMID:18238603

Lin, F J; Wai, R J; Hong, C M

2000-01-01

419

1282 IEEE TRANSACTIONS ON MAGNETICS, VOL. 35, NO 3, MAY 1999 Analysis of the Mechanical Stresses on a Squirrel Cage Induction Motor  

E-print Network

squirrel cage induction motor. We considered the magnetic forces and the centrifugal forces as sources on a Squirrel Cage Induction Motor by the Finite ElementMethod Chang-Hoon Juri and Alain Nicolas CEGELY, UPRESA slip conditions. Index terms-Finite Element Analysis, magnetic forces, mechanical deformations

Paris-Sud XI, Université de

420

Control Systems Lab Using a LEGO Mindstorms NXT Motor System  

ERIC Educational Resources Information Center

This paper introduces a low-cost LEGO Mindstorms NXT motor system for teaching classical and modern control theories in standard third-year undergraduate courses. The LEGO motor system can be used in conjunction with MATLAB, Simulink, and several necessary toolboxes to demonstrate: 1) a modeling technique; 2) proportional-integral-differential…

Kim, Y.

2011-01-01

421

Impulsive control of permanent magnet synchronous motors with parameters uncertainties  

Microsoft Academic Search

The permanent magnet synchronous motors (PMSMs) may have chaotic behaviours for the uncertain values of parameters or under certain working conditions, which threatens the secure and stable operation of motor-driven. It is important to study methods of controlling or suppressing chaos in PMSMs. In this paper, robust stabilities of PMSM with parameter uncertainties are investigated. After the uncertain matrices which

Dong Li; Shi-Long Wang; Xiao-Hong Zhang; Dan Yang; Hui Wang

2008-01-01

422

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

423

Motor Skill Learning, Retention, and Control Deficits in Parkinson's Disease  

Microsoft Academic Search

Parkinson's disease, which affects the basal ganglia, is known to lead to various impairments of motor control. Since the basal ganglia have also been shown to be involved in learning processes, motor learning has frequently been investigated in this group of patients. However, results are still inconsistent, mainly due to skill levels and time scales of testing. To bridge across

Lisa Katharina Pendt; Iris Reuter; Hermann Müller

2011-01-01

424

Electric motor drives and control-past, present, and future  

Microsoft Academic Search

A comprehensive review of the state of the art in the field of electric motor drives and control strategies is presented. It is pointed out that drive technology has seen impressive growth during the last three decades. Recent advances in semiconductor power electronics and microelectronics have made is possible to use AC motors in many variable-speed drive applications. Implementation of

PARESH C. SEN

1990-01-01

425

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 ...

426

Model Reference Adaptive Control of Permanent Magnet Synchronous Motor  

NASA Astrophysics Data System (ADS)

In this paper the classical theory of the direct Model Reference Adaptive Control is used to develop a control algorithm for Permanent Magnet Synchronous Motor (PMSM). A PMSM model widely used in electric drives community is considered as base for control system development. Conventionally used controllers are replaced by adaptive ones. The resulting control system adapts to changes in any of PMSM parameters.

Tárník, Marián; Murgaš, Ján

2011-05-01

427

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

428

End effect analysis of linear induction motor based on the wavelet transform technique  

SciTech Connect

HSST (High Speed Surface Transport) is currently being developed for the railway systems of urban transportation in Japan. It is used in the electromagnetic suspension and short-stator Linear Induction Motor (LIM) for the HSST. The performance of LIM is degraded due to the influence of the end effects. LIM is analyzed using the Fourier series expansion to throw light on this problem. However, to obtain the high-accuracy in this technique, the number of times for calculating is increased. In case of the Wavelet transform technique, as the Wavelet coefficients converge rapidly to zero, this technique has been applied to analyze the end effects of LIM. In this paper, the authors investigated the method for determining of mother wavelet.

Mori, Yoshihiko; Torii, Susumu; Ebihara, Daiki

1999-09-01

429

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.

430

Research on transient behaviors and detection methods of stator winding inter-turn short circuit fault in induction motors based on multi-loop mathematical model  

Microsoft Academic Search

This paper aims to the detection of stator winding inter-turn short circuit fault (SWITSCF) in induction motors. Firstly, the multi-loop mathematical models of squirrel cage induction motor, YN, Y or D connected, under the conditions that the motor is healthy\\/faulty with stator winding inter-turn shorts, are developed. Secondly, the transient simulation of SWITSCF as well as the related experiment is

Li Heming; Sun Liling; Xu Boqiang

2005-01-01

431

FPGA based embedded system for induction motor failure monitoring at the start-up transient vibrations with wavelets  

Microsoft Academic Search

Accurate monitoring on induction motors is mandatory for modern industry in order to guarantee the overall process quality. The common practice for monitoring is performed by third party enterprises that test the electrical machines with general-purpose instrumentation equipment, which do not allow on-line operation with the subsequent increase in production costs. Several methodologies have been proposed in recent years for

Carlos Rodriguez-donate; René De Jesús Romero-troncoso; Arturo Garcia-perez; Daniel A. Razo-montes

2008-01-01

432

Phase shift method for radial magnetic force analysis in induction motors with non-skewed asymmetrical rotor slots  

Microsoft Academic Search

Skewing which is commonly used in smaller sized induction motors for the reduction of magnetic noise causes higher cross currents in the rotor bars. This leads to a substantial increase of stray losses in the skewed rotor. Reduction of these losses can be achieved by eliminating skew, but at the cost of increased noise level and torque ripple in the

R. Chitroju; C. Sadarangani

2009-01-01

433

Induction motors in electromechanical systems with a periodical moment of inertia — Analytical calculation of forced oscillations and test. Part 1  

Microsoft Academic Search

Contents Induction motors driving mechanical multibody systems with periodical motion (i.e. mechanisms, looms etc.) are subjected to a forced oscillation. This is due to the resulting moment of inertia and the imposed torque: Both of them are periodical functions of the rotation angle. The oscillation is approximated by a finite Fourier series satisfying a linearized system of equations. The comparison

T. Vikopoulos

1985-01-01

434

Induction motors in electromechanical systems with a periodical moment of inertia — Analytical calculation of forced oscillations and test. Part 2  

Microsoft Academic Search

Contents Induction motors driving mechanical multibody systems with periodical motion (i.e. mechanisms, looms etc.) are subjected to a forced oscillation. This is due to the resulting moment of inertia and the imposed torque: Both of them are periodical functions of the rotation angle. The oscillation is approximated by a finite Fourier series satisfying a linearized system of equations. The comparison

T. Vikopoulos

1985-01-01

435

Diagnostics of Faults in Induction Motor ASDs Using Time-Stepping Coupled Finite Element State-Space and Time Series Data Mining Techniques  

Microsoft Academic Search

In this paper, the dual track use of the time stepping coupled finite element-state space modeling of induction motors to generate databases for healthy and faulty motor performances, coupled to time series data mining techniques, is presented. This dual track is demonstrated here in its embryonic stage to represent a potentially very powerful motor fault diagnostics and identification tool, when

Richard J. Povinelli; John F. Bangura; Nabeel A. O. Demerdash; Ronald H. Brown

2000-01-01

436

78 FR 51724 - California State Motor Vehicle Pollution Control Standards; Tractor-Trailer Greenhouse Gas...  

Federal Register 2010, 2011, 2012, 2013, 2014

...9900-20-OAR] California State Motor Vehicle Pollution Control Standards; Tractor-Trailer Greenhouse Gas Regulation; Request for Waiver...the control of emissions from new motor vehicles or new motor vehicle engines subject to...

2013-08-21

437

Speech motor control and acute mountain sickness  

NASA Technical Reports Server (NTRS)

BACKGROUND: An objective method that accurately quantifies the severity of Acute Mountain Sickness (AMS) symptoms is needed to enable more reliable evaluation of altitude acclimatization and testing of potentially beneficial interventions. HYPOTHESIS: Changes in human articulation, as quantified by timed variations in acoustic waveforms of specific spoken words (voice onset time; VOT), are correlated with the severity of AMS. METHODS: Fifteen volunteers were exposed to a simulated altitude of 4300 m (446 mm Hg) in a hypobaric chamber for 48 h. Speech motor control was determined from digitally recorded and analyzed timing patterns of 30 different monosyllabic words characterized as voiced and unvoiced, and as labial, alveolar, or velar. The Environmental Symptoms Questionnaire (ESQ) was used to assess AMS. RESULTS: Significant AMS symptoms occurred after 4 h, peaked at 16 h, and returned toward baseline after 48 h. Labial VOTs were shorter after 4 and 39 h of exposure; velar VOTs were altered only after 4 h; and there were no changes in alveolar VOTs. The duration of vowel sounds was increased after 4 h of exposure and returned to normal thereafter. Only 1 of 15 subjects did not increase vowel time after 4 h of exposure. The 39-h labial (p = 0.009) and velar (p = 0.037) voiced-unvoiced timed separations consonants and the symptoms of AMS were significantly correlated. CONCLUSIONS: Two objective measures of speech production were affected by exposure to 4300 m altitude and correlated with AMS severity. Alterations in speech production may represent an objective measure of AMS and central vulnerability to hypoxia.

Cymerman, Allen; Lieberman, Philip; Hochstadt, Jesse; Rock, Paul B.; Butterfield, Gail E.; Moore, Lorna G.

2002-01-01

438

Pulsewidth modulation control of brushless dc motors for robotic applications  

NASA Astrophysics Data System (ADS)

Pulsewidth modulation (PWM) control of brushless dc motors is implemented with digital servo mechanisms for robotic applications. Under the assumption that the pulse period is much smaller than the motor time-constants, the motor is modeled by a discrete-time transfer function with the pulsewidth playing the role of the control signal. This model enables the application of classical linear control engineering to the design of a digital position servo for the brushless dc steering motors on the CMU Rover. The controller is implemented with a microprocessor and programmable timer to calculate concurrently the actuating signals, time sampling periods, and pulsewidths, as well as to provide commutation. Computer simulation and real-time hardware implementation of the servo demonstrate the efficacy of the approach.

Muir, P. F.; Neuman, C. P.

1985-08-01

439

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

440

Looking East at Motor Control System, Clarity Columns and Blend ...  

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

Looking East at Motor Control System, Clarity Columns and Blend Tank Along East Side of Recycle Recovery Building - Hematite Fuel Fabrication Facility, Recycle Recovery Building, 3300 State Road P, Festus, Jefferson County, MO

441

Fuzzy logic microcontroller implementation for DC motor speed control  

Microsoft Academic Search

This paper describes an alternative method to implement a fuzzy logic speed controller for a DC motor using a fuzzy logic microcontroller. The design, implementation and experimental results on load and no-load conditions are presented. The controller can be implemented by using only a small amount of components and easily improved to be an adaptive fuzzy controller. The controller also

Yodyium Tipsuwan; Mo-Yuen Chow

1999-01-01

442

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

SciTech Connect

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, W.E.

1980-09-09

443

Geometry control of solder interconnects via induction heating  

Microsoft Academic Search

Purpose – The aim of the paper is to control the height and shape of solder interconnects employed in electronic packaging applications by an induction heating reflow method, which can achieve the solder bumping and interconnecting process in a simple way. Design\\/methodology\\/approach – Through the application of a designed induction heating system, a new methodology was forced to exhibit its

Hongbo Xu; Mingyu Li; Yonggao Fu; Ling Wang; Jongmyung Kim

2009-01-01

444

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

445

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

446

Brushless DC motor control without position and speed sensors  

Microsoft Academic Search

A new control strategy for a brushless DC motor without position and speed sensors is presented. The control is performed by software using the DSP-TMS320C25. The prototype has been constructed using a 1.5 kW, 154 V, 2000 r\\/min, four-pole motor. The test results have been satisfactory in both steady and transient states

Nobuyuki Matsui; Masakane Shigyo

1992-01-01

447

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. 6 figs.

Adkins, D.R.; Frost, C.A.; Kahle, P.M.; Kelley, J.B.; Stanton, S.L.

1997-05-20

448

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

449

RCMAC-based adaptive control design for brushless DC motors  

Microsoft Academic Search

This paper proposes a recurrent cerebellar model articulation controller (RCMAC)-based adaptive control for brushless DC motors.\\u000a This control system is composed of a RCMAC and a compensation controller. RCMAC is used to mimic an ideal controller, and\\u000a the compensation controller is designed to compensate for the approximation error between the ideal controller and RCMAC.\\u000a The Lyapunov stability theory is utilized

Chih-min Lin; Chun-fei Hsu; Chao-ming Chung

2009-01-01

450

Extending the Constant Power Speed Range of the Brushless DC Motor through Dual Mode Inverter Control -- Part I: Theory and Simulation  

SciTech Connect

An inverter topology and control scheme has been developed that can drive low-inductance, surface-mounted permanent magnet motors over the wide constant power speed range required in electric vehicle applications. This new controller is called the dual-mode inverter control (DMIC) [1]. The DMIC can drive either the Permanent Magnet Synchronous Machine (PMSM) with sinusoidal back emf, or the brushless dc machine (BDCM) with trapezoidal emf in the motoring and regenerative braking modes. In this paper we concentrate on the BDCM under high-speed motoring conditions. Simulation results show that if all motor and inverter loss mechanisms are neglected, the constant power speed range of the DMIC is infinite. The simulation results are supported by closed form expressions for peak and rms motor current and average power derived from analytical solution to the differential equations governing the DMIC/BDCM drive for the lossless case. The analytical solution shows that the range of motor inductance that can be accommodated by the DMIC is more than an order of magnitude such that the DMIC is compatible with both low- and high-inductance BDCMs. Finally, method is given for integrating the classical hysteresis band current control, used for motor control below base speed, with the phase advance of DMIC that is applied above base speed. The power versus speed performance of the DMIC is then simulated across the entire speed range.

Lawler, J.S.

2001-10-29

451

Memory processes and motor control in extreme environments.  

PubMed

Cognitive-performance and motor-performance activities in multi-task, high-workload environments were assessed during astronaut performance in space flight and in isolation. Data was collected in microgravity on the International Micro-gravity Laboratory (IML) space shuttle mission (STS-42), and the Canadian Astronaut Program Space Unit Life Simulation (CAPSULS) mission offered an ideal opportunity to collect data for individuals in extreme isolation to complement the space flight data using similar hardware, software, and experimental protocols. The mental workload and performance experiment (MWPE) was performed during the IML-1 space flight mission, and the memory processes and motor control (MEMO) experiment was performed during the CAPSULS isolation mission. In both experiments, short-term exhaustive memory and fine motor control associated with human-computer interaction was studied. Memory processes were assessed using a Sternberg-like exhaustive memory search containing 1, 2, 4, or 7 letters. Fine motor control was assessed using velocity-controlled (joystick) and position-controlled (trackball) computer input devices to acquire targets as displayed on a computer screen. Subjects repeated the tasks under two conditions that tested perceptual motor adaptation strategies: 1) During adaptation to the microgravity environment; and 2) While wearing left-right reversing prism goggles during the CAPSULS mission. Both conditions significantly degraded motor performance but not cognitive performance. The data collected during both the MEMO experiment and the MWPE experiments enhance the knowledge base of human interface technology for human performance in extreme environments. PMID:11542391

Newman, D J; Lathan, C E

1999-08-01

452

Excitation Control for Large Disturbances in Power Systems with Dynamic Loads  

E-print Network

--This paper presents a novel large-disturbance con- troller for power systems with significant induction motor disturbances. Index Terms--Robust excitation control, Dynamic Voltage Stability, Induction Motor, Linearisation, is the induction motor. The active power consumption of an induction motor remains constant even after a voltage

Pota, Himanshu Roy

453

INTEGRATED MOTOR AND CONTROL UNIT FOR INDUSTRIAL VARIABLE SPEED DRIVE SYSTEMS  

Microsoft Academic Search

Variable speed drives serve an important function in several industrial applications. They match motor torque and speed to the load, saving energy when load requirements are reduced. The best way to decrease the speed of an induction motor is by feeding it from a variable frequency electronic power converter. In recent years a tendency of integrating the motor and its

Ioan-Adrian VIOREL; Loránd SZABÓ; Radu-Cristian CIORBA

454

Distributed Control of Hybrid Motor Drives  

Microsoft Academic Search

The hybrid inverter fed motor drive with two cascaded multilevel inverters is an attractive option for high performance high power applications such as naval ship propulsion systems due to a number of unique features. There is a natural split between a higher-voltage lower-frequency \\

Keith A. Corzine; Shuai Lu; Tom H. Fikse

2006-01-01

455

Brushless Motor Controller Report Spring 2010  

E-print Network

................................................................................................................. 13 #12;3 I. Introduction In the world of robotics, there are only a finite number of ways to actuate a robot. When the goal is to minimize the cost of transport and improve the energy efficiency, the most logical selection for actuation is electric motors. Other methods of actuation, like hydraulics

Ruina, Andy L.

456

Speed estimation of vector controlled squirrel cage asynchronous motor with artificial neural networks  

Microsoft Academic Search

In this paper, the artificial neural networks as a sensorless speed estimator in indirect vector controlled squirrel cage asynchronous motor control are defined. High dynamic performance power semi conductors obtainable from direct current motors can also be obtained from asynchronous motor through developments in digital signal processors (DSP) and control techniques. With using of field diverting control in asynchronous motors,

Yuksel Oguz; Mehmet Dede

2011-01-01

457

Power factor control of synchronous motors powering large reciprocating compressors  

Microsoft Academic Search

Gas compressor stations: the need to control power factor at large gas compressor stations has been a challenge that designers of synchronous motor controller have struggled with and have not solved. This paper discusses an innovative method of controlling average power factor.

L. B. Farr; M. Fanslow

2005-01-01

458

A high speed velocity control algorithm of multiple stepper motors  

Microsoft Academic Search

When the applications involve the simultaneous control of multiple stepper motors conventional on-line control algorithms fail to produce a high speed step rate. An analysis of the problem is presented and an algorithm [Proc IMechE Part I: J Systems and Control Engineering 217 (2003) 359] is applied which does not have the speed restriction as the conventional ones and does

D. O. Carrica; S. A. González; M. Benedetti

2004-01-01

459

A controller of brushless DC motor for electric vehicle  

Microsoft Academic Search

A controller of brushless dc motor (BLDCM) for electric vehicle is developed based on the mathematical model of BLDCM and special working condition. The drive and control circuit is composed of digital signal processing and EXB841. The paper analyzes the hardware structure of system in detail. Proportional-integral-differential control strategy is adopted in the system. An arithmetic variable velocity prelabeled value

Hong-Xing Wu; Shu-Kang Cheng; Shu-Mei Cui

2005-01-01

460

Position sensing and motor control in industrial robotics  

Microsoft Academic Search

Actual industrial robots are rigid mechanical manipulators, with simple and kinematically solvable mechanical structures. Modern robots are actuated by permanent magnet (PM) brushless synchronous motors and a computer system is used to control and supervise the robot motion, using sensor information to obtain the environment and robot status. Generally those controllers implement a simple positional control law and are closed

J. Norberto Pires

1997-01-01

461

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

462

Simplified Vector Control with Adaptive Back-EMF Parameter Adjustment for Position Sensorless Permanent Magnet Synchronous Motors  

NASA Astrophysics Data System (ADS)

A previously reported vector control method for position sensorless permanent magnet synchronous motors involves the use of controllers with simple block configurations. However, the performance of this method can be affected by the erroneous setting of the motor parameters because a feedback compensator is not used. In this study, the effects of these errors on the steady-state performance of the drive control examined under various error conditions. It was found that the amplitude of the motor current increases when the parameter error is nonzero; the effect of the back-EMF parameter error was especially found to be large. On the basis of this observation, the use of a new compensator named “back-EMF parameter adjustment” is proposed. Simulation results and experimental results showed that the proposed method can compensate for the increase in the amplitude of the motor current resulting from the occurrence of motor parameter errors. A theoretical analysis showed that the performance of our vector control method, which involves the use of the new compensator, is affected only by errors in the d-axis inductance parameter Ld. Therefore, even if there are errors in the other motor parameters, the motor current for the constant load condition can be minimized by using the proposed method.

Sakamoto, Kiyoshi; Iwaji, Yoshitaka; Kaneko, Daigo; Takeuchi, Toshihiro; Endo, Tsunehiro; Kawamura, Atsuo

463

Implementation of motor speed control using PID control in programmable logic controller  

NASA Astrophysics Data System (ADS)

This paper presents the implementation of motor speed control using Proportional Integral Derrivative (PID) controller using Programmable Logic Controller (PLC). Proportional Integral Derrivative (PID) controller is the technique used to actively control the speed of the motor. An AC motor is used in the research together with the PLC, encoder and Proface touch screen. The model of the PLC that has been used in this project is OMRON CJIG-CPU42P where this PLC has a build in loop control that can be made the ladder diagram quite simple using function block in CX-process tools. A complete experimental analysis of the technique in terms of system response is presented. Comparative assessment of the impact of Proportional, Integral and Derivative in the controller on the system performance is presented and discussed.

Samin, R. E.; Azmi, N. A.; Ahmad, M. A.; Ghazali, M. R.; Zawawi, M. A.

2012-11-01

464

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

465

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

466

Personal Computer Based Controller For Switched Reluctance Motor Drives  

NASA Astrophysics Data System (ADS)

Th9, switched reluctance motor (SRM) has recently gained considerable attention in the variable speed drive market. Two important factors that have contributed to this are, the simplicity of construction and the possibility of developing low cost con-trollers with minimum number of switching devices in the drive circuits. This is mainly due to the state-of-art of the present digital circuits technology and the low cost of switching devices. The control of this motor drive is under research. Optimized performance of the SRM motor drive is very dependent on the integration of the controller, converter and the motor. This research on system integration involves considerable changes in the control algorithms and their implementation. A Personal computer (PC) based controller is very appropriate for this purpose. Accordingly, the present paper is concerned with the design of a PC based controller for a SRM. The PC allows for real-time microprocessor control with the possibility of on-line system parameter modifications. Software reconfiguration of this controller is easier than a hardware based controller. User friendliness is a natural consequence of such a system. Considering the low cost of PCs, this controller will offer an excellent cost-effective means of studying the control strategies for the SRM drive intop greater detail than in the past.

Mang, X.; Krishnan, R.; Adkar, S.; Chandramouli, G.

1987-10-01

467

Wavelet neural network control for linear ultrasonic motor drive via adaptive sliding-mode technique.  

PubMed

A wavelet neural network (WNN) control system is proposed to control the moving table of a linear ultrasonic motor (LUSM) drive system to track periodic reference trajectories in this study. The design of the WNN control system is based on an adaptive sliding-mode control technique. The structure and operating principle of the LUSM are introduced, and the driving circuit of the LUSM, which is a voltage source inverter using two-inductance two capacitance (LLCC) resonant technique, is introduced. Because the dynamic characteristics and motor parameters of the LUSM are nonlinear and time varying, a WNN control system is designed based on adaptive sliding-mode control technique to achieve precision position control. In the WNN control system, a WNN is used to learn the ideal equivalent control law, and a robust controller is designed to meet the sliding condition. Moreover, the adaptive learning algorithms of the WNN and the bound estimation algorithm of the robust controller are derived from the sense of Lyapunov stability analysis. The effectiveness of the proposed WNN control system is verified by some experimental results in the presence of uncertainties. PMID:12839181

Lin, Faa-Jeng; Wai, Rong-Jong; Chen, Mu-Ping

2003-06-01

468

Abstract--The induction motor is well known as the workhorse of industry. The development of variable speed  

E-print Network

. This method was adopted in all high performance induction machine drives until field- oriented control (FOC in 1929, it took a long time to develop the idea of field-oriented control (FOC) that is based of FOC started from Germany. As one of the first, Hannakam [2] built up a dynamic model of induction

Paderborn, Universität

469

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

470

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

471

Alcohol Control Policies and Motor Vehicle Fatalities  

Microsoft Academic Search

The purpose of this study is to estimate the effects of drunk driving deterrents and other alcohol related policies on drunk driving. The data set employed is an annual time-series of state cross-sections for the 48 contiguous states of the U.S. from 1982 through 1988. Total and alterative alcohol involved motor vehicle fatality rates, for the general population and for

Frank J. Chaloupka; Henry Saffer; Michael Grossman

1993-01-01

472

Adaptive hybrid control for linear piezoelectric ceramic motor drive using diagonal recurrent CMAC network.  

PubMed

This paper presents an adaptive hybrid control system using a diagonal recurrent cerebellar-model-articulation-computer (DRCMAC) network to control a linear piezoelectric ceramic motor (LPCM) driven by a two-inductance two-capacitance (LLCC) resonant inverter. Since the dynamic characteristics and motor parameters of the LPCM are highly nonlinear and time varying, an adaptive hybrid control system is therefore designed based on a hypothetical dynamic model to achieve high-precision position control. The architecture of DRCMAC network is a modified model of a cerebellar-model-articulation-computer (CMAC) network to attain a small number of receptive-fields. The novel idea of this study is that it employs the concept of diagonal recurrent neural network (DRNN) in order to capture the system dynamics and convert the static CMAC into a dynamic one. This adaptive hybrid control system is composed of two parts. One is a DRCMAC network controller that is used to mimic a conventional computed torque control law due to unknown system dynamics, and the other is a compensated controller with bound estimation algorithm that is utilized to recover the residual approximation error for guaranteeing the stable characteristic. The effectiveness of the proposed driving circuit and control system is verified with hardware experiments under the occurrence of uncertainties. In addition, the advantages of the proposed control scheme are indicated in comparison with a traditional integral-proportional (IP) position control system. PMID:15565776

Wai, Rong-Jong; Lin, Chih-Min; Peng, Ya-Fu

2004-11-01

473

Effect of motor dynamics on nonlinear feedback robot arm control  

NASA Technical Reports Server (NTRS)

A nonlinear feedback robot controller that incorporates the robot manipulator dynamics and the robot joint motor dynamics is proposed. The manipulator dynamics and the motor dynamics are coupled to obtain a third-order-dynamic model, and differential geometric control theory is applied to produce a linearized and decoupled robot controller. The derived robot controller operates in the robot task space, thus eliminating the need for decomposition of motion commands into robot joint space commands. Computer simulations are performed to verify the feasibility of the proposed robot controller. The controller is further experimentally evaluated on the PUMA 560 robot arm. The experiments show that the proposed controller produces good trajectory tracking performances and is robust in the presence of model inaccuracies. Compared with a nonlinear feedback robot controller based on the manipulator dynamics only, the proposed robot controller yields conspicuously improved performance.

Tarn, Tzyh-Jong; Li, Zuofeng; Bejczy, Antal K.; Yun, Xiaoping

1991-01-01

474

Reward improves long-term retention of a motor memory through induction of offline memory gains.  

PubMed

In humans, training in which good performance is rewarded or bad performance punished results in transient behavioral improvements. The relative effects of reward and punishment on consolidation and long-term retention, critical behavioral stages for successful learning, are not known. Here, we investigated the effects of reward and punishment on these different stages of human motor skill learning. We studied healthy subjects who trained on a motor task under rewarded, punished, or neutral control conditions. Performance was tested before and immediately, 6 hr, 24 hr, and 30 days after training in the absence of reward or punishment. Performance improvements immediately after training were comparable in the three groups. At 6 hr, the rewarded group maintained performance gains, whereas the other two groups experienced significant forgetting. At 24 hr, the reward group showed significant offline (posttraining) improvements, whereas the other two groups did not. At 30 days, the rewarded group retained the gains identified at 24 hr, whereas the other two groups experienced significant forgetting. We conclude that training under rewarded conditions is more effective than training under punished or neutral conditions in eliciting lasting motor learning, an advantage driven by offline memory gains that persist over time. PMID:21419628

Abe, Mitsunari; Schambra, Heidi; Wassermann, Eric M; Luckenbaugh, Dave; Schweighofer, Nicolas; Cohen, Leonardo G

2011-04-12

475

The analysis of an ungrounded Wye-Delta transformer bank serving an induction motor and single-phase lighting loads  

SciTech Connect

This paper documents the detailed analysis of the three-phase ungrounded wye-delta transformer bank serving a combination three-phase induction motor and single-phase lighting load. A 3 x 3 transfer function matrix is developed that makes it possible to determine the load line-to-line voltages with a knowledge of the primary voltages of the transformer bank. Included in the transfer function matrix are the transformer impedances, unsymmetrical secondary impedance matrix, and the impedances of the motor and single-phase lighting load.

Kersting, W.H.; Rathbun, J.S.

2000-02-01

476

AC motor controller with 180 degree conductive switches  

NASA Technical Reports Server (NTRS)

An ac motor controller is operated by a modified time-switching scheme where the switches of the inverter are on for electrical-phase-and-rotation intervals of 180.degree. as opposed to the conventional 120.degree.. The motor is provided with three-phase drive windings, a power inverter for power supplied from a dc power source consisting of six switches, and a motor controller which controls the current controlled switches in voltage-fed mode. During full power, each switch is gated continuously for three successive intervals of 60.degree. and modulated for only one of said intervals. Thus, during each 60.degree. interval, the two switches with like signs are on continuously and the switch with the opposite sign is modulated.

Oximberg, Carol A. (Inventor)

1995-01-01

477

Oromotor variability in children with mild spastic cerebral palsy: a kinematic study of speech motor control  

Microsoft Academic Search

BACKGROUND: Treating motor speech dysfunction in children with CP requires an understanding of the mechanism underlying speech motor control. However, there is a lack of literature in quantitative measures of motor control, which may potentially characterize the nature of the speech impairments in these children. This study investigated speech motor control in children with cerebral palsy (CP) using kinematic analysis.

Chia-ling Chen; Hsieh-ching Chen; Wei-hsien Hong; Fan-pei Gloria Yang; Liang-yi Yang; Ching-yi Wu

2010-01-01

478

A study on adaptive load torque observer for robust precision position control of BLDC motor  

Microsoft Academic Search

A new control method for precision robust position control of a brushless DC (BLDC) motor using asymptotically stable adaptive load torque observer is presented in the paper. Precision position control is obtained for the BLDC motor system approximately linearized using the field-orientation method. Many of these drive systems use BLDC motors to avoid backlash. However, the disadvantages of the motor

Jong Sun Ko; Sung Koo Youn; Bimal K. Bose

1999-01-01

479

Two-motor direct drive control for elevation axis of telescope  

NASA Astrophysics Data System (ADS)

Two-motor application has become a very attractive filed in important field which high performance is permitted to achieve of position, speed, and acceleration. In the elevation axis of telescope control system, two-motor direct drive is proposed to enhance the high performance of tracking control system. Although there are several dominant strengths such as low size of motors and high torsional structural dynamics, the synchronization control of two motors is a very difficult and important. In this paper, a multi-loop control technique base master-slave current control is used to synchronize two motors, including current control loop, speed control loop and position control loop. First, the direct drive function of two motors is modeled. Compared of single motor direct control system, the resonance frequency of two motor control systems is same; while the anti-resonance frequency of two motors control system is 1.414 times than those of sing motor system. Because of rigid coupling for direct drive, the speed of two motor of the system is same, and the synchronization of torque for motors is critical. The current master-slave control technique is effective to synchronize the torque, which the current loop of the master motors is tracked the other slave motor. The speed feedback into the input of current loop of the master motors. The experiments test the performance of the two motors drive system. The random tracking error is 0.0119" for the line trajectory of 0.01°/s.

Tang, T.; Tan, Y.; Ren, G.

2014-07-01

480

Motor power factor controller with a reduced voltage starter  

NASA Technical Reports Server (NTRS)

A power factor type motor controller in which the conventional power factor constant voltage command signal is replaced during a starting interval with a graduated control voltage. The present invention adds to the three-phase system of pending application Ser. No. 199,765, filed Oct. 23, 1980, means for modifying the operation of the system for a motor start-up interval of 5 to 30 seconds. The modification is that of providing via ramp generator 174 an initial ramp-like signal which replaces a constant power factor signal supplied by potentiometer 70. The ramp-like signal is applied to terminal 40 where it is summed with an operating power factor signal from phase detectors 32, 34, and 36 to thereby obtain a control signal for ultimately controlling SCR devices 12, 14, and 16 to effect a gradual turn-on of motor 10. The significant difference of the present invention over prior art is that the SCR devices are turned on at an advancing rate with time responsive to the combination signal described rather than simply a function of a ramp-like signal alone. The added signal, the operating power factor signal, enables the production of a control signal which effectively eliminates a prior problem with many motor starting circuits, which is that of accompanying motor instabilities.

Nola, Frank J. (Inventor)

1983-01-01

481

Position Estimation and Control of Compact BLDC Motors Based on Analog Linear Hall Effect Sensors  

E-print Network

Position Estimation and Control of Compact BLDC Motors Based on Analog Linear Hall Effect Sensors measurements with insignificant increases to motor size. I. INTRODUCTION Recently brushless DC (BLDC) motors[14 - only a centimeter or less, to very large - motors requiring kiloWatts to run. BLDC motors are found

Simpkins, Alex

482

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

483

Stand alone induction generator with terminal impedance controller and no turbine controls  

Microsoft Academic Search

Induction generators with hydraulic turbines are often used for cogeneration. The same turbine generator configuration can be used for stand-alone generation if an impedance controller is connected to the generator terminals; this configuration requires no hydraulic controls on the turbine. The authors propose an electronic impedance controller to control the voltage and the frequency of a stand-alone induction generator. The

R. Bonert; G. Hoops

1990-01-01

484

An Integrated 30kW Matrix Converter based Induction Motor Drive  

Microsoft Academic Search

This paper explores the viability of using direct power converter technology to realize integrated motor drives, at power levels significantly higher than is possible with traditional approaches, fitting within the same space envelope as an equivalent motor. The integrated motor design was targeted at pump and fan applications where the need to install motor drives in a separate location is

P. W. Wheeler; J. C. Clare; L. Empringham; K. J. Bradley; S. Pickering; D. Lampard; M. Apap

2005-01-01

485

Sensorless vector and speed control of brushless motor drives  

Microsoft Academic Search

In the present paper an approach is presented to the speed control of permanent magnet synchronous motors without mechanical transducers. The rotor position, which is an essential component of any vector control scheme, is calculated through the instantaneous stator flux position and an estimated value of the load angle. A closed-loop state observer is implemented to compute the speed feedback

A. Consoli; S. Musumeci; A. Raciti; A. Testa

1994-01-01

486

Simplified Sensorless Control for BLDC Motor, Using DSP Technology  

Microsoft Academic Search

This paper describes a simple way to control, in a sensorless way, a Brushless DC (BLDC) motor for electric vehicle applications. To control this machine it is generally required to count with a position sensor because the inverter phases, acting at any time, must be commuted depending on the rotor position. Encoders and resolvers have been used for sensing rotor

Juan W. Dixon; Matías Rodríguez; Rodrigo Huerta

487

Fuzzy logic control of a switched reluctance motor  

Microsoft Academic Search

This paper presents the use of fuzzy logic control (FLC) for switched reluctance motor (SRM) speed. The PLC performs a PI-like control strategy, giving the current reference variation based on speed error and its change. The performance of the drive system was evaluated through digital simulations through the toolbox Simulink of the Matlab program

M. G. Rodrigues; W. I. Suemitsu; P. Branco; J. A. Dente; L. G. B. Rolim

1997-01-01

488

Sensory-motor networks involved in speech production and motor control: An fMRI study.  

PubMed

Speaking is one of the most complex motor behaviors developed to facilitate human communication. The underlying neural mechanisms of speech involve sensory-motor interactions that incorporate feedback information for online monitoring and control of produced speech sounds. In the present study, we adopted an auditory feedback pitch perturbation paradigm and combined it with functional magnetic resonance imaging (fMRI) recordings in order to identify brain areas involved in speech production and motor control. Subjects underwent fMRI scanning while they produced a steady vowel sound /a/ (speaking) or listened to the playback of their own vowel production (playback). During each condition, the auditory feedback from vowel production was either normal (no perturbation) or perturbed by an upward (+600 cents) pitch-shift stimulus randomly. Analysis of BOLD responses during speaking (with and without shift) vs. rest revealed activation of a complex network including bilateral superior temporal gyrus (STG), Heschl's gyrus, precentral gyrus, supplementary motor area (SMA), Rolandic operculum, postcentral gyrus and right inferior frontal gyrus (IFG). Performance correlation analysis showed that the subjects produced compensatory vocal responses that significantly correlated with BOLD response increases in bilateral STG and left precentral gyrus. However, during playback, the activation network was limited to cortical auditory areas including bilateral STG and Heschl's gyrus. Moreover, the contrast between speaking vs. playback highlighted a distinct functional network that included bilateral precentral gyrus, SMA, IFG, postcentral gyrus and insula. These findings suggest that speech motor control involves feedback error detection in sensory (e.g. auditory) cortices that subsequently activate motor-related areas for the adjustment of speech parameters during speaking. PMID:25623499

Behroozmand, Roozbeh; Shebek, Rachel; Hansen, Daniel R; Oya, Hiroyuki; Robin, Donald A; Howard, Matthew A; Greenlee, Jeremy D W

2015-04-01

489

A new viewpoint of end effect of linear induction motor from secondary side in ladder type model  

SciTech Connect

In Japan, the subway trains driven by linear induction motors (LIMs) have been used in metropolitans of Tokyo and Osaka. As a new viewpoint, the physical phenomenon of end effect in ladder type linear induction motor (LIM) is observed from secondary side by making use of the structural feature. The phenomena in the ladder type and the sheet type LIM are the same fundamentally. The analytical method for the study is the special two-dimensional electromagnetic analysis, in which the current in each conducting bar is determined considering with time harmonics of secondary current. A new factor t{sub p}/t{sub s} is proposed to present the degree of end effect, in where t{sub p} is the passing duration of primary core at a secondary point and t{sub s} the half-period of slip frequency. The factor will be useful for the design grasping the essential of end effect of LIM.

Fujii, N.; Harada, T.

1999-09-01

490

Redundant information encoding in primary motor cortex during natural and prosthetic motor control.  

PubMed

Redundant encoding of information facilitates reliable distributed information processing. To explore this hypothesis in the motor system, we applied concepts from information theory to quantify the redundancy of movement-related information encoded in the macaque primary motor cortex (M1) during natural and neuroprosthetic control. Two macaque monkeys were trained to perform a delay center-out reaching task controlling a computer cursor under natural arm movement (manual control, 'MC'), and using a brain-machine interface (BMI) via volitional control of neural ensemble activity (brain control, 'BC'). During MC, we found neurons in contralateral M1 to contain higher and more redundant information about target direction than ipsilateral M1 neurons, consistent with the laterality of movement control. During BC, we found that the M1 neurons directly incorporated into the BMI ('direct' neurons) contained the highest and most redundant target information compared to neurons that were not incorporated into the BMI ('indirect' neurons). This effect was even more significant when comparing to M1 neurons of the opposite hemisphere. Interestingly, when we retrained the BMI to use ipsilateral M1 activity, we found that these neurons were more redundant and contained higher information than contralateral M1 neurons, even though ensembles from this hemisphere were previously less redundant during natural arm movement. These results indicate that ensembles most associated to movement contain highest redundancy and information encoding, which suggests a role for redundancy in proficient natural and prosthetic motor control. PMID:22042443

So, Kelvin; Ganguly, Karunesh; Jimenez, Jessica; Gastpar, Michael C; Carmena, Jose M

2012-06-01

491

Pulsewidth modulated speed control of brushless dc motors  

NASA Astrophysics Data System (ADS)

Until recently, few alternatives existed for the use of hydraulic and pneumatic actuators in primary flight control applications. With the advent of the samarium-cobalt permanent magnet brushless DC motor, consideration must now be given to the utilization of an electromechanical actuator in missiles which require significant maneuvering capability and hence, greater torques. This thesis investigates the theory and techniques of pulse width modulator speed control of brushless DC motors. After describing basic pulse width modulation (PWM) concepts, two constant velocity control schemes are presented: current feedback and a limit cycle scheme. By calculating the motor form factor (a figure of merit for power losses in the switching transistors which comprise the PWM network), the relative worth of each scheme is then evaluated. An in depth study is conducted of the limit cycle approach, with an emphasis on the power loss reductions obtained through the reduction of the velocity limit settings.

Askinas, A. A.

1984-09-01

492

Startup current analysis of incipient broken rotor bar in induction motors using high-resolution spectral analysis  

Microsoft Academic Search

) Abstract -- This paper presents an experimental study of one broken-rotor-bar time-frequency evolution effects, when the bar is partially broken in an induction motor by gradually drilling one hole, each three millimeters, from healthy until the rotor bar is broken. The one phase current startup transient at each of three partially-broken conditions (0 mm, 3 mm, 6 mm and

Arturo Garcia-Perez; Rene J. Romero-Troncoso; Eduardo Cabal-Yepez; Roque A. Osornio-Rios; Jose de Jesus Rangel-Magdaleno; Homero Miranda

2011-01-01

493

Performances improvements and torque ripple minimization for VSI fed induction machine with direct control torque.  

PubMed

This paper describes a torque ripple reduction technique with constant switching frequency for direct torque control (DTC) of an induction motor (IM). This method enables a minimum torque ripple control. In order to obtain a constant switching frequency and hence a torque ripple reduction, we propose a control technique for IM. It consists of controlling directly the electromagnetic torque by using a modulated hysteresis controller. The design methodology is based on space vector modulation (SVM) of electrical machines with digital vector control. MATLAB simulations supported with experimental study are used. The simulation and experimental results of this proposed algorithm show an adequate dynamic to IM; however, the research can be extended to include synchronous motors as well. The implementation of the proposed algorithm is described. It doesn't require any PI controller in the torque control loop. The hardware inverter is controlled digitally using a Texas Instruments TMS320F240 digital signal processor (DSP) with composed C codes for generating the required references. The results obtained from simulation and experiments confirmed the feasibility of the proposed strategy compared to the conventional one. PMID:21193193

Abdelli, R; Rekioua, D; Rekioua, T

2011-04-01

494

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

495

Vibration Control by Magnetostrictive Actuator Coupled with Negative Inductance Circuits  

Microsoft Academic Search

The stiffness of magnetostrictive materials can be controlled by the feedback action of the negative inductance circuits connected to the coils surrounding them. The effect is analogous to that of piezoelectric materials whose stiffness can be controlled by the negative capacitance circuits connected to them. The applied sinusoidal strain of the central rod in a magnetostrictive actuator induces the sinusoidal

Eiichi Fukada; Munehiro Date; Kosei Sekigawa

2003-01-01

496

Finite element calculation of the saturation DQ-axes inductance for a direct drive PM synchronous motor considering cross-magnetization  

Microsoft Academic Search

Direct-drive torque-servo permanent magnet synchronous motor often operates in overload conditions. Its characteristic is evidently influenced by magnetic circuit saturation. The direct-axis and quadrature-axis inductances of surface mounted permanent magnet synchronous motor are usually considered as constant i.e. Ld=Lq. In fact, both the d-axis and q-axis inductances vary with load condition because of magnetic circuit saturation. A novel procedure is

Hu Jianhui; Zou Jibin; Liang Weiyan

2003-01-01

497

Double Side Control of Wound Rotor Induction Machine for Wind Energy Application Employing Half Controlled  

E-print Network

2005-27 Double Side Control of Wound Rotor Induction Machine for Wind Energy Application Employing side control of wound rotor induction machine for wind energy application employing half controlled of Wisconsin, Madison, WI 53706, USA, lipo@engr.wisc.edu Abstract ­ A double side converter fed wound rotor

Lipo, Thomas

498

Chaotic operation and chaos control of travelling wave ultrasonic motor.  

PubMed

The travelling wave ultrasonic motor, which is a nonlinear dynamic system, has complex chaotic phenomenon with some certain choices of system parameters and external inputs, and its chaotic characteristics have not been studied until now. In this paper, the preliminary study of the chaos phenomenon in ultrasonic motor driving system has been done. The experiment of speed closed-loop control is designed to obtain several groups of time sampling data sequence of the amplitude of driving voltage, and phase-space reconstruction is used to analyze the chaos characteristics of these time sequences. The largest Lyapunov index is calculated and the result is positive, which shows that the travelling wave ultrasonic motor has chaotic characteristics in a certain working condition Then, the nonlinear characteristics of travelling wave ultrasonic motor are analyzed which includes Lyapunov exponent map, the bifurcation diagram and the locus of voltage relative to speed based on the nonlinear chaos model of a travelling wave ultrasonic motor. After that, two kinds of adaptive delay feedback controllers are designed in this paper to control and suppress chaos in USM speed control system. Simulation results show that the method can control unstable periodic orbits, suppress chaos in USM control system. Proportion-delayed feedback controller was designed following and arithmetic of fuzzy logic was used to adaptively adjust the delay time online. Simulation results show that this method could fast and effectively change the chaos movement into periodic or fixed-point movement and make the system enter into stable state from chaos state. Finally the chaos behavior was controlled. PMID:23490014

Shi, Jingzhuo; Zhao, Fujie; Shen, Xiaoxi; Wang, Xiaojie

2013-08-01

499

Brushless DC motor control without position and speed sensors  

Microsoft Academic Search

The control strategy using a DSP-TMS320C25 is developed on the basis of the instantaneous voltage equation of the brushless DC motor. Without a position sensor, the controller has no information about rotor position: therefore, the controller determines the applied voltage according to the hypothetical rotor position, which is not necessarily coincident with the actual rotor position. Since the voltage supplied

Nobuyuki Matsui; Masakane Shigyo

1990-01-01

500

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