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1

Induction motor control  

NASA Technical Reports Server (NTRS)

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

Hansen, Irving G.

1990-01-01

2

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

3

Control of induction motors with voltage saturation  

Microsoft Academic Search

The paper analyzes the speed and flux regulation of induc- tion motors under saturation of the input voltage. Starting from a control law that achieves regulation in the absence of saturation, we propose a design that guarantees convergence to an admissible operating point, in the presence of input saturation. Control of induction motors is a challenging non-linear con- trol problem

Christian Bastin; Rodolphe Sepulchre; Fabrice Jadot; Francois Malrait; Schneider Toshiba; Rue A. Blanchet

4

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.

5

Synchronous Control of a Static AC Induction Motor Drive  

Microsoft Academic Search

Conventional methods of controlling an induction motor utilize regulation of stator current and motor slip frequency in order to maintain system stability. This control strategy requires a shaft speed feedback and fast-response current regulation. An alternative method of controlling an induction motor is presented which achieves the necessary system stabilization by controlling only the motor frequency. The control inherently regulates

Allan B. Plunkett; John D. D'Atre; Thomas A. Lipo

1979-01-01

6

High-performance direct torque control of an induction motor  

Microsoft Academic Search

A novel direct torque control method for an induction motor is presented which is quite different from field-oriented control. Improving the torque response of a large-capacity induction motor using two sets of three-phase inverters and an open-data induction motor is of special concern. Instantaneous voltage vectors applied by an inverter have redundancy characteristics which provide some flexibility for selecting the

I. Takahashi; Y. Ohmori

1989-01-01

7

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

8

FUZZY LOGIC CONTROL OF AC INDUCTION MOTORS  

EPA Science Inventory

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

9

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

10

Motor power control circuit for ac induction motors  

NASA Astrophysics Data System (ADS)

A motor power control of the type which functions by controlling the power factor wherein one of the parameters of power factor current on time is determined by the on time of a triac through which current is supplied to the motor. By means of a positive feedback circuit, a wider range of control is effected.

Nola, F. J.

1983-03-01

11

Motor power control circuit for ac induction motors  

NASA Technical Reports Server (NTRS)

A motor power control of the type which functions by controlling the power factor wherein one of the parameters of power factor current on time is determined by the on time of a triac through which current is supplied to the motor. By means of a positive feedback circuit, a wider range of control is effected.

Nola, F. J. (inventor)

1983-01-01

12

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

13

Control system for an induction motor with energy recovery  

NASA Astrophysics Data System (ADS)

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

Nola, F. J.

1983-11-01

14

Field-Oriented Control Of Induction Motors  

NASA Technical Reports Server (NTRS)

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

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

1993-01-01

15

Dynamic decoupling of voltage frequency controlled induction motors  

Microsoft Academic Search

A new nonlinear control scheme for voltage frequency controlled (VFC) induction motors is presented, based on dynamic state-feedback. The proposed approach allows to design an input-output decoupling controller for motor torque and flux, using as inputs the amplitude and the frequency of the supply voltage. The closed-loop system contains an unobservable sink. The dynamics of this part is stable and

Alessandro De Luca; Giovanni Ulivi

16

Water flow control for air-conditioner using inverter-controlled induction motor drives  

Microsoft Academic Search

Since induction motors are widely used for water flow control of an air-conditioning system, it is possible to apply inverter-controlled induction motor drives to achieve variable-water-volume (VWV) control instead of using conventional on-off control. The objective of this paper is to investigate the applications of inverter-controlled induction motor drives to the variable-water-volume control for the circulated cooling water pump of

Ming-Chi Chang; Jennshing Wang; Yen-Shin Lai

2000-01-01

17

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

18

Sensorless position control of induction motors-an emerging technology  

Microsoft Academic Search

Concepts for the sensorless position control of induction motor drives rely on anisotropic properties of the machine rotor. Such anisotropies can be incorporated as periodic variations of magnetic saliencies in various ways. The built-in spatial anisotropy is detected by injecting a high-frequency flux wave into the stator. The resulting stator current harmonics contain frequency components that depend on the rotor

Joachim Holtz

1998-01-01

19

Sensorless position control of induction motors. An emerging technology  

Microsoft Academic Search

Concepts for sensorless position control of induction motor drives rely on anisotropic properties of the machine rotor. Such anisotropies can be incorporated as periodic variations of magnetic saliencies in various ways. The built-in spatial anisotropy is detected by injecting a high-frequency flux wave into the stator. The resulting stator current harmonics contain frequency components that depend on the rotor position.

Joachim Holtz

1998-01-01

20

Induction motor control system with voltage controlled oscillator circuit  

NASA Technical Reports Server (NTRS)

A voltage controlled oscillator circuit is reported in which there are employed first and second differential amplifiers. The first differential amplifier, being employed as an integrator, develops equal and opposite slopes proportional to an input voltage, and the second differential amplifier functions as a comparator to detect equal amplitude positive and negative selected limits and provides switching signals which gate a transistor switch. The integrating differential amplifier is switched between charging and discharging modes to provide an output of the first differential amplifier which upon the application of wave shaping provides a substantially sinusoidal output signal. A two phased version with a second integrator provides a second 90 deg phase shifted output for induction motor control.

Nola, F. J.; Currie, J. R.; Reid, H., Jr. (inventors)

1973-01-01

21

Variable Speed Drive of Single Phase Induction Motor Using Frequency Control Method  

Microsoft Academic Search

Single-phase induction motors are widely used in home appliances and industrial control. The multispeed operation and multipurpose operation are provided by controlling the speed of these motors. This research paper is variable speed drive of induction motor using frequency control method. It is to develop the solid state control system to be reliable and economically feasible to use with fractional

Aung Zaw Latt; Ni Ni Win

2009-01-01

22

High Performance Speed Sensorless Control of Three-Phase Induction Motor Based on Cloud Computing  

Microsoft Academic Search

Induction motor is a cast of alternating current motor where charge endures allotted to the rotor close-at-hand deputation of conductive charge. These motors are broadly applied in industrial claim due to they are arduous along with adhere no contacts. The speed controller of deltoid phase induction motor is applied to alleviate the aberration of speed. The central constructivist of this

Z. M. Salem; M. A. Abbas

2012-01-01

23

Chattering free sliding mode control law for position control of the drive employing induction motor  

Microsoft Academic Search

Principles of forced dynamics control and sliding mode control are combined to derive control algorithm for position control of the drive with induction motor. The controller is of the cascade structure, comprising an inner speed control loop based on forced dynamics control and an outer position control loop based on sliding mode control. The inner speed control loop respects the

Ján Vittek; P. Bris; M. Stulrajter; M. Pacha

2008-01-01

24

Control of induction motors via feedback linearization with input-output decoupling  

Microsoft Academic Search

In induction motor control, power efficiency is an important factor to be considered. We attempt to achieve both high dynamic performance and maximum power efficiency by means of linear decoupling of rotor speed (or motor torque) and rotor flux. The induction motor with our controller possesses the input-output dynamic characteristics of a linear system such that the rotor speed (or

DONG-IL KIM; IN-JOONG HA; MYOUNG-SAM KO

1990-01-01

25

Neural and Fuzzy Adaptive Control of Induction Motor Drives  

NASA Astrophysics Data System (ADS)

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.; Sbita, L.; Abdelkrim, M. N.

2008-06-01

26

An Approach to Flux Control of Induction Motors Operated with Variable-Frequency Power Supply  

Microsoft Academic Search

A new speed control system for induction motors has been developed which is capable of controlling with quick field weakening and superior response and stability. This method is to control the stator current as a vector quantity on the basis of slip frequency control. More specifically, it is designed to calculate the commanded stator current of the induction motor by

Akira Nabae; Kenichi Otsuka; Hiroshi Uchino; Ryoichi Kurosawa

1980-01-01

27

An air-gap-flux-oriented vector controller for stable operation of bearingless induction motors  

Microsoft Academic Search

A bearingless induction machine has combined characteristics of an induction motor and magnetic bearings. It is known that the magnetic suspension of the rotor becomes unstable at overload operation, particularly in transient conditions. A novel air-gap-flux-oriented vector control scheme has been proposed to operate the bearingless induction motor during the high torque acceleration period. It has been found that there

Takahiro Suzuki; Akira Chiba; M. Azizur Rahman; Tadashi Fukao

2000-01-01

28

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

29

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

30

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

31

A new technique for position control of Induction Motor using adaptive inverse control  

Microsoft Academic Search

Control of Induction Motor (IM) is well known to be difficult owing to the fact the models of IM are highly nonlinear and time variant. In this paper, to achieve accurate control performance of rotor position control of IM, a new method is proposed by using adaptive inverse control (AIC) technique. In recent years, AIC is a very vivid field

A. H. O. Ahmed; M. O. Ajangnay; S. A. Mohamed; M. W. Dunnigan

2010-01-01

32

Intelligent control of the regenerative braking in an induction motor drive  

Microsoft Academic Search

This work deal with the problem related to the energy recovered in an induction motor drive. During deceleration, a regenerative braking control strategy allows the recovery of the mechanical energy stored in an inertial mass. This process involves the conversion of the kinetic energy into electric energy. The parts that compose the system are a squirrel cage induction motor variable

S. Cholula; A. Claudio; J. Ruiz

2005-01-01

33

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...

34

New DTC control scheme for the induction motor fed with a three-level inverter  

Microsoft Academic Search

In this paper a new scheme based on direct torque control strategy is presented. The new controller is used to control an induction motor fed with a three-level inverter. The new control scheme avoids the use of the classical hysteresis block and the look-up table. Instead, the torque and stator flux errors are used together with the motor speed to

X. del Toro; M. G. Jayne; P. A. Witting; V. M. Sala; A. Arias; J. L. Romeral

2005-01-01

35

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

36

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

37

A Low Cost Induction Motor Controller for Light Electric Vehicles in Local Areas  

Microsoft Academic Search

This paper is concerned with design considerations and tradeoffs involved in the power electronics development for light electric vehicles. A review of propulsion system design, power conversion structure and control is presented. A three-phase squirrel-cage induction motor is used as propulsion system for an electric scooter. The motor is controlled at different operating conditions by means of a simple scalar

Rui Esteves Araújo; Henrique Teixeira; José Barbosa; Vicente Leite

2005-01-01

38

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

NASA Astrophysics Data System (ADS)

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

Abdollahi, Rohollah; Farhangi, Reza; Yarahmadi, Ali

2014-08-01

39

Simple and Robust Indirect Thrust Control for Positioning of Linear Induction Motors  

NASA Astrophysics Data System (ADS)

Dealing with position control of Linear Induction Motors (LIM), most strategies in bibliography are based on Secondary Flux Oriented Control (SFOC) and Direct Thrust Control (DTC). However, SFOC of linear induction motors needs complex identification methods to compensate parameter variation during operation, mainly due to local heating and end-effects. On the other hand, DTC based methods for LIMs present thrust ripple and have problems at low and zero speeds. In this paper, a new Indirect Thrust Control (ITC) based strategy for position control of linear induction motors that makes up for these drawbacks is presented. The position control loop design methodology and the method for automatic adjustment of compensators are described. Experimental results are presented to evaluate the performance and sensitivity of the control strategy. Finally, some conclusions are drawn about the applicability of the new algorithm that demonstrate the main advantages versus SFOC and DTC.

Martínez-Iturralde, Miguel; Martínez, Gonzalo; Castelli, Marcelo; Rico, Andrés García; Flórez, Julián

40

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

41

Stator resistance identification using artificial intelligent technique for the adaptive controller of magnetically saturated induction motor  

Microsoft Academic Search

The problem of controlling the induction motor ?-model with magnetic saturation is considered using an adaptive controller with stator current and rotor speed measurement. The new in this paper that in the previous work, only the rotor resistance and load torque can be adapted using the controller but in this work, using artificial intelligent technique, an adaptation of the stator

Ismail Mohamed Mahmoud

2010-01-01

42

Flux-Based Deadbeat Control of Induction-Motor Torque  

NASA Technical Reports Server (NTRS)

An improved method and prior methods of deadbeat direct torque control involve the use of pulse-width modulation (PWM) of applied voltages. The prior methods are based on the use of stator flux and stator current as state variables, leading to mathematical solutions of control equations in forms that do not lend themselves to clear visualization of solution spaces. In contrast, the use of rotor and stator fluxes as the state variables in the present improved method lends itself to graphical representations that aid in understanding possible solutions under various operating conditions. In addition, the present improved method incorporates the superposition of high-frequency carrier signals for use in a motor-self-sensing technique for estimating the rotor shaft angle at any speed (including low or even zero speed) without need for additional shaft-angle-measuring sensors.

Kenny, Barbara H.; Lorenz, Robert D.

2003-01-01

43

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

44

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

45

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

46

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

47

Evaluation of induction motor performance using an electronic power factor controller  

NASA Technical Reports Server (NTRS)

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

1978-01-01

48

An Experimental Research on Vector Control of Induction Motor Based on Simple Model  

Microsoft Academic Search

\\u000a Given the heavy computation, easy saturation and cumulate errors of conventional direct vector control, the vector control\\u000a of induction motor based on simple model is studied and the detailed scheme is described on the basis of the decomposing and\\u000a approximating the rotor flux. Because of the direct closed-loop control of the magnetizing current and the torque current\\u000a and the complex

Yinhai Zhang; Jinfa Ge; Weixia Liu; Qin Wang

2009-01-01

49

Fast efficiency optimization techniques for the indirect vector-controlled induction motor drives  

Microsoft Academic Search

This paper presents two simple and very useful techniques for the efficiency optimization of the indirect vector-controlled induction motor drives. In the synchronously rotating reference frame the flux-producing current is controlled until the power at the DC link is minimum. Of the two techniques, the first method controls the flux-producing current in a regular and smooth manner. The second technique

Chandan Chakraborty; Yoichi Hori

2003-01-01

50

On-line stator and rotor resistance estimation scheme for vector-controlled induction motor drive using artificial neural networks  

Microsoft Academic Search

This paper presents a new method of on-line estimation for the stator and rotor resistances of the induction motor in the indirect vector controlled drive, using artificial neural networks. The back propagation algorithm is used for training of the neural networks. The error between the desired state variable of an induction motor and the actual state variable of a neural

Baburaj Karanayil; Muhammed Fazlur Rahman; Colin Grantham

2003-01-01

51

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

52

Research on induction motor energy saving strategy using voltage regulation control  

Microsoft Academic Search

A new energy-saving scheme of voltage-regulation control for induction motors at periodically varying loads with almost constant speed is presented in this paper. The energy-saving principle, control strategies, triggering mode of SCRs are studied. Based on the analysis of the current oscillation in the voltage-regulation by 3-phase thyristors with the synchronous voltage signal, the solution to current oscillation is presented.

Peihua Hao; Ming Cheng; Ruiwu Cao; Yubin Wang; Zheng Wang

2010-01-01

53

Is sensorless position control of standard induction motors a feasible technology?  

Microsoft Academic Search

Concepts for sensorless position control of induction motor drives rely on anisotropic properties of the machine rotor. The built-in spatial anisotropy is detected by injecting a high-frequency flux wave into the stator. The resulting stator current harmonics contain frequency components that depend on the rotor position. Models of the rotor saliency serve to extract the rotor position signal using phase-locked

Joachim Holtz

2000-01-01

54

Parameter Adaption for the Speed-Controlled Static AC Drive with a Squirrel-Cage Induction Motor  

Microsoft Academic Search

The performance of speed-controlled induction motor drives, without a direct sensing of the flux, depends heavily on the accuracy with which the motor parameters are known. They change widely with the temperature, frequency, and current amplitude. With a control based on rotor position measurement and inner current control loops, the rotor resistance is the most essential changing parameter. A method

Luis J. Garces

1980-01-01

55

Universal Parameter Measurement and Sensorless Vector Control of Induction and Permanent Magnet Synchronous Motors  

NASA Astrophysics Data System (ADS)

Recently, induction motors (IMs) and permanent-magnet synchronous motors (PMSMs) have been used in various industrial drive systems. The features of the hardware device used for controlling the adjustable-speed drive in these motors are almost identical. Despite this, different techniques are generally used for parameter measurement and speed-sensorless control of these motors. If the same technique can be used for parameter measurement and sensorless control, a highly versatile adjustable-speed-drive system can be realized. In this paper, the authors describe a new universal sensorless control technique for both IMs and PMSMs (including salient pole and nonsalient pole machines). A mathematical model applicable for IMs and PMSMs is discussed. Using this model, the authors derive the proposed universal sensorless vector control algorithm on the basis of estimation of the stator flux linkage vector. All the electrical motor parameters are determined by a unified test procedure. The proposed method is implemented on three test machines. The actual driving test results demonstrate the validity of the proposed method.

Yamamoto, Shu; Ara, Takahiro

56

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

NASA Technical Reports Server (NTRS)

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

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

1984-01-01

57

Voltage, frequency, and phase-difference angle control of PWM inverters-fed two-phase induction motors  

Microsoft Academic Search

A phase-difference angle (PDA) controlled pulsewidth-modulated (PWM) inverter is proposed for a two-phase induction motor adjustable speed drive. Output waveforms are fixed over the whole operating range of the motor. The motor torque is controlled not by the modulation of the phase voltage, but by the PDA. Based on the selected harmonic elimination (SHE) PWM technique, the commutation angles of

Do-Hyun Jang; Jong-Soo Won

1994-01-01

58

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

59

Robust speed sensorless control of universal field oriented induction motor drive with on-line stator resistance tuning  

Microsoft Academic Search

In this paper, a speed sensorless induction motor drive is introduced which is direct vector controlled in a universal field-oriented (UFO) reference frame. Based on partial feedback linearization theory, a nominal speed control is designed first, regardless of the system parameter uncertainties and external load disturbance. Then, in the perturbed condition, a fuzzy-adaptive sliding mode controller is employed which ensures

J. Soltani; M. Hajian; Y. Abdolmaleki

2003-01-01

60

Save power in AC induction motors  

NASA Technical Reports Server (NTRS)

Relatively simple and inexpensive circuitry improves power factor and reduces power dissipation in induction motors operating below full load. Electronic control loop conserves energy by reducing voltage applied to lightly loaded motor. Circuit forces motor to run at constant predetermined optimum power factor, regardless of load or line voltage variations. Solid-state switch varies voltage.

Nola, F. J.

1977-01-01

61

Design and Analysis of Closed Loop Microprocessor Based Static Slip Energy Recovery Controlled Slip Ring Induction Motor Drive  

Microsoft Academic Search

In this paper the complete design and analysis of microprocessor based closed loop static slip energy recovery controlled slip ring induction motor drive is presented. The speed and current controllers are implemented using INTEL-8085 microprocessor. The set of non -linear differential equations of the drive based on d c equivalent circuit are linearized around an operating point. Using forward approximation

B. K. SINGH

62

Direct torque controlled space vector modulated induction motor fed by a Z-source inverter for electric vehicles  

Microsoft Academic Search

This paper proposes a new closed loop speed control of an induction motor fed by a high performance Z-source inverter (ZSI), the speed control is based on direct torque control space vector modulation (DTC-SVM) control strategy. The modified space vector modulation (MSVM) is used to insert the shoot-through state within the switching signals for the ZSI. A dual loop controller

Omar Ellabban; Joeri Van Mierlo; Philippe Lataire

2011-01-01

63

A new closed loop speed control of induction motor fed by a high performance Z-source inverter  

Microsoft Academic Search

This paper proposes a new closed loop speed control of an induction motor fed by a high performance Z-source inverter (ZSI), the speed control is based on V\\/F control and indirect field-oriented control (IFOC) strategies. The indirect field-oriented control based on PWM voltage modulation with voltage decoupling compensation is used to insert the shoot-through state within the switching signals. A

Omar Ellabban; Joeri Van Mierlo; Philippe Lataire

2010-01-01

64

Efficiency-optimized control of medium-size induction motor drives  

Microsoft Academic Search

The efficiency of a variable speed induction motor drive can be optimized by adaptation of the motor flux level to the load torque. In small drives (<10 W), this can be done without considering the relatively small converter losses, but for medium-size drives (10-1000 kW) the losses cannot be disregarded without further analysis. The importance of the converter losses on

Flemming Abrahamsen; Frede Blaabjerg; John K. Pedersen; Paul B. Thoegersen

2001-01-01

65

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

PubMed

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

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

2013-11-01

66

Online Stator and Rotor Resistance Estimation Scheme Using Artificial Neural Networks for Vector Controlled Speed Sensorless Induction Motor Drive  

Microsoft Academic Search

This paper presents a new method of online estimation for the stator and rotor resistances of the induction motor for speed sensorless indirect vector controlled drives, using artificial neural networks. The error between the rotor flux linkages based on a neural network model and a voltage model is back propagated to adjust the weights of the neural network model for

Baburaj Karanayil; Muhammed Fazlur Rahman; Colin Grantham

2007-01-01

67

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

68

A comparative study of different control techniques for an induction motor fed by a Z-source inverter for electric vehicles  

Microsoft Academic Search

This paper presents a comparative study of the most significant control methods (scalar control (V\\/F), indirect field oriented control (IFOC) and direct torque control (DTC)) for an induction motor fed by a Z-source inverter (ZSI) for automotive applications. The three control techniques are implemented using PWM voltage modulation. The comparison is based on various criteria including: the motor dynamic performance,

Omar Ellabban; Joeri Van Mierlo; Philippe Lataire

2011-01-01

69

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

70

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

71

A radial position control of induction type bearingless motor considering phase delay caused by the rotor squirrel cage  

Microsoft Academic Search

A squirrel cage induction type bearingless motor which has conventional four-pole stator windings and additional two-pole stator windings for the radial position control of the rotor has been proposed. The squirrel cage rotor windings can be seen as not only four-pole windings but also as two-pole windings. An equivalent circuit for one phase at the two-pole winding terminals is shown.

S. Nomura; A. Chiba; F. Nakamura; K. Ikeda; T. Fukao; M. A. Rahman

1993-01-01

72

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

73

Nonlinear torque and stator flux controller for induction motor drive based on adaptive input–output feedback linearization and sliding mode control  

Microsoft Academic Search

This paper describes a nonlinear torque and stator flux controller for three phase induction motor (IM) drives on the basis of a space vector modulation (SVM) scheme. Using the IM fifth order model in a fixed “ab” axis reference frame with stator currents (isa ,isb) and stator fluxes (?sa,?sb) as state variables, a sliding mode (SM) torque and flux controller

R. Yazdanpanah; J. Soltani; G. R. Arab Markadeh

2008-01-01

74

Model Reference Adaptive Controller-Based Rotor Resistance and Speed Estimation Techniques for Vector Controlled Induction Motor Drive Utilizing Reactive Power  

Microsoft Academic Search

In this paper, a detailed study on the model reference adaptive controller (MRAC) utilizing the reactive power is presented for the online estimation of rotor resistance to maintain proper flux orientation in an indirect vector controlled induction motor drive. Selection of reactive power as the functional candidate in the MRAC automatically makes the system immune to the variation of stator

Suman Maiti; Chandan Chakraborty; Yoichi Hori; Minh C. Ta

2008-01-01

75

A linear induction motor conveyer  

E-print Network

magnetic waves, One wave is created by three phase current flowing through the coils, and the other wave results from a current induced in the parts, Such a conveyer is constructed and then studied with respect to efficiency and f'easibil ity... List of Figures Chapter I. INTRODUCTION II. LITERATURE SURVEY Material Handling: State of the Art History of I inear Induction Motors Uses of Linear Motors III. THEORY: PART I A Look at Transverse Waves Magnetic Fields IV. THEORY: PART II...

Solinsky, Kenneth Sheldon

2012-06-07

76

Segmented rail linear induction motor  

SciTech Connect

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

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

1996-01-01

77

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

78

ADAPTIVE FUZZY SLIDING-MODE CONTROL OF SPEED SENSORLESS UNIVERSAL FIELD ORIENTED INDUCTION MOTOR DRIVE WITH ON-LINE STATOR RESISTANCE TUNING  

Microsoft Academic Search

In this paper, a speed sensorless induction motor drive is introduced which is direct vector controlled in a universal field-oriented (UFO) reference frame. This chosen reference frame is easily linked with direct and indirect rotor, stator and air gap field orientation control schemes of the induction machine (IM) drives using a stator to rotor virtual turn ratio. Based on partial

J. SOLTANI; Y. ABDOLMALEKI; M. HAJIAN

79

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

80

Fast-response power saver for induction motors  

NASA Technical Reports Server (NTRS)

With control circuit, induction motors run more efficiently at light loads and respond to sudden load changes. It also anticipates power needs so that motor can respond instantly (to a load applied by a clutch, for example).

Nola, F. J.

1979-01-01

81

Induction motor speed drive improvement using fuzzy IP-self-tuning controller. A real time implementation.  

PubMed

An IP-self-tuning controller tuned by a fuzzy adjustor, is proposed to improve induction machine speed control. The interest of such controller is the possibility to adjust only one gain, instead of two gains for the case of the PI-self-tuning controllers commonly used in the literature. This paper presents simulation and experimental results. These latter were obtained by practical implementation on a DSPace 1104 board of three different speed controllers (the classical IP, the fuzzy-like-PI and the IP-self-tuning), for a 1.5KW induction machine. The paper presents different tests used to compare the performances of the proposed controller to the two others in terms of computation time, tracking performances and disturbances rejection. PMID:23317661

Lokriti, Abdesslam; Salhi, Issam; Doubabi, Said; Zidani, Youssef

2013-05-01

82

Characteristics of a bearingless induction motor  

Microsoft Academic Search

A bearingless induction motor with additional windings in the stator slots is proposed. Additional two-pole windings were wound with the conventional four-pole windings to produce radial magnetic forces. These forces, which control the position of the rotor shaft, are produced when magnetic fluxes from the two-pole windings cause an imbalance in the revolving magnetic field of the four-pole windings. Inductance

A. Chiba; D. T. Power; M. A. Rahman

1991-01-01

83

Motor Controllers  

NASA Technical Reports Server (NTRS)

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

1984-01-01

84

INDUCTION MOTOR FAULT DIAGNOSTIC AND MONITORING METHODS  

E-print Network

INDUCTION MOTOR FAULT DIAGNOSTIC AND MONITORING METHODS by Aderiano M. da Silva, B.S. A Thesis;i Abstract Induction motors are used worldwide as the "workhorse" in industrial applications material. However, induction motor faults can be detected in an initial stage in order to prevent

Povinelli, Richard J.

85

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

NASA Astrophysics Data System (ADS)

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

Piyarat, Wekin; Kinnares, Vijit

86

DSP-based speed adaptive flux observer of induction motor  

Microsoft Academic Search

A method for estimating the rotor flux and speed of an induction motor based on adaptive control theory is presented. The method is applied to a direct field-oriented induction motor control without speed sensors. The influence of the parameter variation on the speed estimation can be removed by the proposed parameter adaptive scheme. The validity of the adaptive flux observer

Hisao Kubota; Kouki Matsuse; T. Nakano

1993-01-01

87

Load-Responsive Motor Controller  

NASA Technical Reports Server (NTRS)

New circuit controls voltage applied to a three-phase induction motor in response to magnitude of current, so as to reduce power consumption when the motor is idling or operating at less than full load. Control circuit decreases rms applied voltage to match decreases in motor load over entire torque range. This considerably decreases power consumption in motors operating at a fraction of their rated torques.

Edge, T. M.

1982-01-01

88

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

E-print Network

_abderrahim@ yahoo.fr effects in the motor magnetic circuit. The simplified control problem has been dealt with the nominal value, the (overloaded) machine operates in the saturation zone of its magnetic characteristic

Paris-Sud XI, Université de

89

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

90

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

91

Analysis of self excited induction generator feeding induction motor  

Microsoft Academic Search

The paper assesses the suitability of a self excited induction generator (SEIG) to supply dynamic loads like induction motors. An algorithm is proposed to predict the steady state performance of an SEIG feeding an induction motor (IM). The computed and experimental results are presented for different operating conditions of an SEIG-IM system. A good agreement reached between the predicted and

L. Shridhar; B. Singh; C. S. Jha

1994-01-01

92

Nonlinear Control of the Doubly Fed Induction Motor with Copper Losses Minimization for Electrical Vehicle  

NASA Astrophysics Data System (ADS)

There is an increasing interest in electric vehicles due to environmental concerns. Recent efforts are directed toward developing an improved propulsion system for electric vehicles applications with minimal power losses. This paper deals with the high efficient vector control for the reduction of copper losses of the doubly fed motor. Firstly, the feedback linearization control based on Lyapunov approach is employed to design the underlying controller achieving the double fluxes orientation. The fluxes controllers are designed independently of the speed. The speed controller is designed using the Lyapunov method especially employed to the unknown load torques. The global asymptotic stability of the overall system is theoretically proven. Secondly, a new Torque Copper Losses Factor is proposed to deal with the problem of the machine copper losses. Its main function is to optimize the torque in keeping the machine saturation at an acceptable level. This leads to a reduction in machine currents and therefore their accompanied copper losses guaranteeing improved machine efficiency. The simulation results in comparative presentation confirm largely the effectiveness of the proposed DFIM control with a very interesting energy saving contribution.

Drid, S.; Nait-Said, M.-S.; Tadjine, M.; Makouf, A.

2008-06-01

93

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

94

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

95

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

96

Gross motor control  

MedlinePLUS

Gross motor control is the ability to make large, general movements (such as waving an arm or lifting a ... Gross motor control is a milestone in the development of an infant. Infants develop gross motor control before they ...

97

Pulsed linear induction motors in Maglev applications  

Microsoft Academic Search

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

K. Davey

2000-01-01

98

An Improved Rotor Resistance Identification Method for Magnetic Field Regulation in Bearingless Induction Motor Drives  

Microsoft Academic Search

Bearingless induction motors have combined characteristics of an induction motor and magnetic bearings. Bearingless induction motors tend to suffer from the influence of rotor resistance variation under field-oriented control because magnetic suspension is sensitive to magnetic field rotational position error. In this paper, a novel rotor resistance identification technique based on variables in the magnetic suspension control loop is proposed.

Akira Chiba; Daigo Akamatsu; Tadashi Fukao; M. Azizur Rahman

2008-01-01

99

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

100

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

NASA Astrophysics Data System (ADS)

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

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

101

Linear induction motor - Equivalent-circuit model  

Microsoft Academic Search

An equivalent-circuit model of a linear induction motor is developed, using the rotary-motor model as a basis. The rotary-motor model is modified to account for the so-called 'end effect' and is used to predict output thrust, vertical forces and couples. These predictions are checked against test results of a practical motor used on a prototype transit vehicle.

J. Duncan

1983-01-01

102

The GM High-Performance Induction Motor Drive System  

Microsoft Academic Search

The recent advances in the power handling capacity of semiconductor devices make it possible to replace dc and ac commutator machines for variable-speed applications by high-speed, lightweight, squirrel-cage induction motors. This paper describes a controlled slip-frequency system which eliminates the low-starting torque, low-power factor, and the low efficiency at lower speeds, normally associated with induction motors. The development program at

PAUL D. AGARWAL

1969-01-01

103

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

104

Enhancement in Steady State and Dynamic Performance of Direct Torque Control Induction Motor Drive  

NASA Astrophysics Data System (ADS)

An enhancement in dynamic performance of a traditional DTC drive can be achieved by a robust speed control algorithm while the steady state performance depends upon the switching strategy selected for minimization of torque ripples and an efficient flux control loop. In this paper a new torque ripple reduction technique with a modified look up table incorporating a larger number of synthesized non zero active voltage vectors is utilized to overcome the limitations of the conventionally controlled DTC drive. A fuzzy logic based speed controller and a low pass filter with tunable cutoff frequency for flux estimation is proposed in this paper. The proposed study is investigated through simulation and experimentally validated on a test drive.

Singh, Bhoopendra; Jain, Shailendra; Dwivedi, Sanjeet

2013-09-01

105

INSPECTION MEANS FOR INDUCTION MOTORS  

Microsoft Academic Search

an appartus is descripbe for inspcting electric motors and more ; expecially an appartus for detecting falty end rings inn suqirrel cage inductio ; motors while the motor is running. In its broua aspects, the mer would around ; ce of reference tedtor means also itons in the phase ition of the An electronic ; circuit for conversion of excess-3

1959-01-01

106

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

107

Mitigation of EMI generated by a variable-frequency-drive controller for an AC induction motor  

NASA Astrophysics Data System (ADS)

In recent years a significant number of digital devices and systems have been added to receiving and data-processing sites. These additions have enhanced the ability of the sites to accomplish their mission. They have also introduced new kinds of electromagnetic interference (EMI) into these sites along with accompanying performance degradation problems. In this thesis one specific case of EMI is considered. It is EMI from a digital climate-control system of a building housing a data-processing facility. The digital system generated excessive amounts of EMI. The EMI was conducted throughout the site over power and control conductors. Electromagnetic fields from EMI current flowing in these conductors coupled the EMI into other nearby conductors. Integrated barrier, filter, and ground techniques were used to reduce the conducted and radiated EMI to harmless levels.

Vanwiltenburg, Philip E.

1994-09-01

108

Analysis of self excited induction generator feeding induction motor  

SciTech Connect

The paper is motivated to assess the suitability of a self excited induction generator (SEIG) to supply dynamic loads like induction motors. An algorithm is proposed to predict the steady state performance of an SEIG feeding an induction motor (IM). The computed and experimental results are presented for different operating conditions of an SEIG-IM system. A good agreement reached between the predicted and test results validate the effectiveness of the proposed algorithm. Experimentally recorded transients of an SEIG during a series of switching operations are presented to demonstrate the ability of an SEIG to sustain the starting of an IM. By analyzing the performance of a typical 7.5 kW, 3-phase SEIG feeding induction motors of different ratings, useful guidelines are proposed for the design of an SEIG-IM system in autonomous applications like agricultural pumpsets.

Shridhar, L.; Singh, B.; Jha, C.S.; Singh, B.P. (IIT Delhi, New Delhi (India). Dept. of Electrical Engineering)

1994-06-01

109

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

Microsoft Academic Search

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

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

1992-01-01

110

Speed control of a PV powered DC motor driving a self-excited 3-phase induction generator for maximum utilization efficiency  

SciTech Connect

Photovoltaic (PV) powered dc motors driving dedicated loads (e.g., water pumps) are increasingly used in the remote rural areas of may developing countries. The key to their success is simplicity (direct coupling, no dc-ac conversion, no storage batteries, etc.). Because of the relatively high cost of the PV array, the system designer is interested in maximizing its utilization efficiency. A PV powered dc motor can also be used to drive a three-phase self-excited induction generator (SEIG). This arrangement is useful as part of an integrated renewable energy system (IRES), which takes advantage of the inherent diversity of wind and solar energy in most developing countries to improve power quality. The SEIG is driven by a wind-turbine, dc motor, or both. Another advantage of this arrangement is its versatile control characteristics through the dc motor control. This paper describes a technique to maximize the utilization efficiency of the PV array by controlling the field current of the dc motor through a dc chopper.

Alghuwainem, S.M. [King Saud Univ., Riyadh (Saudi Arabia). Electrical Engineering Dept.] [King Saud Univ., Riyadh (Saudi Arabia). Electrical Engineering Dept.

1996-12-01

111

A Novel Approach to Induction Motor Transfer Functions  

Microsoft Academic Search

The scope of static ac drives is increasing rapidly, and with this increase has evolved the need to devise control strategies for a variety of new applications. Purely analytical approaches to design of control systems for ac drives are hindered by the highly coupled nature of the ac induction motor equations which, in the past, necessitated lengthy manual derivations of

T.A. Lipo; A. B. Plunkett

1974-01-01

112

FORTRAN program for induction motor analysis  

NASA Technical Reports Server (NTRS)

A FORTRAN program for induction motor analysis is described. The analysis includes calculations of torque-speed characteristics, efficiency, losses, magnetic flux densities, weights, and various electrical parameters. The program is limited to three-phase Y-connected, squirrel-cage motors. Detailed instructions for using the program are given. The analysis equations are documented, and the sources of the equations are referenced. The appendixes include a FORTRAN symbol list, a complete explanation of input requirements, and a list of error messages.

Bollenbacher, G.

1976-01-01

113

Bridge Inductance of Induction Motor with Closed Rotor Slots  

NASA Astrophysics Data System (ADS)

Closed rotor slots are widely employed in low-power squirrel-cage induction motors with die-cast aluminum cage rotors. Die-cast aluminum cages with closed rotor slots can be manufactured commercially. They help reduce flux pulsation in air gaps, attenuate acoustic noises, and achieve high efficiency. However, it is difficult to calculate bridge inductance of a closed rotor slot accurately because the main flux passes through the bridge and iron saturation can be achieved depending upon the bar current. In this study, bridge inductance was investigated by using a search coil and by FEM analysis and conventional equations. The bridge flux density and the bridge linkage flux were measured by using 4P-0.75kW motor with closed rotor slots, and the bridge inductance was calculated as a function of rotor bar current. The bridge inductance was also analyzed by FEM, and the results were analytically checked by using the calculated conventional equations. From these analyses, it is seen that the measured values of the bridge inductance are in good agreement with the values calculated by FEM and conventional methods. It is verified that the bridge inductance shows a trend similar to that of the ?-H curve of the rotor steel sheet.

Matsushita, Makoto; Ishibashi, Fuminori; Suzuki, Takao; Noda, Shinichi

114

Induction Motors Bearing Failures Detection and Diagnosis  

E-print Network

331 1 Induction Motors Bearing Failures Detection and Diagnosis Using a RBF ANN Park Pattern Based Method I. Y. Ã?nel, I. enol and M. E. H. Benbouzid Abstract--This paper deals with the problem of bearing using the mains current and the rotor speed measurement. The proposed approach is based on the stator

Boyer, Edmond

115

Induction motor parameter determination technique using artificial neural networks  

Microsoft Academic Search

This paper presents a new method of on-line estimation for the stator and rotor resistances of the induction motor in the indirect vector controlled drive, using artificial neural networks. The back propagation algorithm is used for training of the neural networks. The error between the rotor flux linkages based on a neural network model and a voltage model is back

Baburaj Karanayil; Muhammed Fazlur Rahman; Colin Grantham

2008-01-01

116

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

117

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

118

Load Characteristics of Induction Motor Manufactured by Soft Magnetic Composite  

NASA Astrophysics Data System (ADS)

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

Fukuda, Tomohiro; Sasaki, Yutaka; Morimoto, Masayuki

119

Effect of Static VAR Compensator to improve an induction motor's performance  

Microsoft Academic Search

The main objectives of this paper are to improve performance of an induction motor by using Static VAR Compensator (SVC). The induction motor is used in a wide variety of applications; hence proper performance of it is important. SVCs are known FACTS devices to control voltage and to improve transient stability of power systems, and also to manage reactive power

Mahmoud Ebadian; Morteza Alizadeh

2010-01-01

120

Stator and rotor resistance observers for induction motor drive using fuzzy logic and artificial neural networks  

Microsoft Academic Search

This paper presents a new method of on-line estimation for the stator and rotor resistances of the induction motor in the indirect vector controlled drive, using fuzzy logic and artificial neural networks. The back propagation algorithm is used for the training of the neural networks for rotor resistance identification. The error between the desired state variable of an induction motor

Baburaj Karanayil; Muhammed Fazlur Rahman; Colin Grantham

2003-01-01

121

Rotor speed estimation for indirect stator flux oriented induction motor drive based on MRAS scheme JES  

Microsoft Academic Search

In this paper, a conventional indirect stator flux oriented controlled (ISFOC) induction motor drive is presented. In order to eliminate the speed sensor, an adaptation algorithm for tuning the rotor speed is proposed. Based on the model reference adaptive system (MRAS) scheme, the rotor speed is tuned to obtain an exact ISFOC induction motor drive. The reference and adjustable models,

Youssef Agrebi; Moncef Triki; Yassine Koubaa; Mohamed Boussak

122

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

E-print Network

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

Tolbert, Leon M.

123

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

124

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

DOEpatents

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

Mikesell, H.E.; Lucy, E.

1998-02-03

125

Direct Flux and Torque Regulation in a PWM Inverter-Induction Motor Drive  

Microsoft Academic Search

A dc motor drive is controlled by varying the armature current and field current. The field is a measure of flux, and the armature current times field current is a measure of torque. Various approximate means of estimating the flux and torque levels in an induction motor exist. Most of these methods are sensitive to motor parameter value changes and

Allan B. Plunkett

1977-01-01

126

No load characteristics of a bearingless induction motor  

Microsoft Academic Search

This study involves a bearingless induction motor constructed with additional two-pole stator windings. These additional windings can be used to produce radial forces on the rotor shaft. The two-pole winding currents were regulated by radial position control loops to maintain the rotor's position near the stator center. The voltage and current relationships of the two-pole windings were derived from a

A. Chiba; D. T. Power; M. A. Rahman

1991-01-01

127

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

128

Five-level GTO inverters for large induction motor drives  

Microsoft Academic Search

The development of large induction motor drives with low torque ripple and fast dynamic response for new or retrofit applications has been limited by the device ratings and problems of series connections. This paper investigates the use of a five-level GTO voltage-sourced inverter for large induction motor drives. The advantages of such a drive are that single GTO thyristors may

R. W. Menzies; P. Steimer; J. K. Steinke

1994-01-01

129

Harmonic Torque Calculation of Induction Motors Using Electromagnetic Field Analysis  

Microsoft Academic Search

In this paper, we investigate effects of harmonic electromagnetic field to torque characteristics of induction motors from both side of experiment and electromagnetic field analysis. The characteristics of two kinds of the aluminum cage three-phase induction motors are measured and calculated. One is with the closed rotor slots. The other is semi-closed. In the experiment, the negative torque at synchronous

Katsumi Yamazaki; Yoshihisa Haruishi; Takahiro Ara

2004-01-01

130

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

131

ac bidirectional motor controller  

NASA Astrophysics Data System (ADS)

Test data are presented and the design of a high-efficiency motor/generator controller at NASA-Lewis for use with the Space Station power system testbed is described. The bidirectional motor driver is a 20 kHz to variable frequency three-phase ac converter that operates from the high-frequency ac bus being designed for the Space Station. A zero-voltage-switching pulse-density-modulation technique is used in the converter to shape the low-frequency output waveform.

Schreiner, K.

132

ac bidirectional motor controller  

NASA Technical Reports Server (NTRS)

Test data are presented and the design of a high-efficiency motor/generator controller at NASA-Lewis for use with the Space Station power system testbed is described. The bidirectional motor driver is a 20 kHz to variable frequency three-phase ac converter that operates from the high-frequency ac bus being designed for the Space Station. A zero-voltage-switching pulse-density-modulation technique is used in the converter to shape the low-frequency output waveform.

Schreiner, K.

1988-01-01

133

Design and Construction of Induction Motor Thermal Monitoring System  

Microsoft Academic Search

Rotor and stator temperature rise in induction motors is considered to be a major cause of motor insulation degradation and motor failures. In most cases, it is necessary to monitor rotor bars and stator windings to make sure that their temperature remains below the allowable limits. In this paper, design and implementation of a temperature measuring system suitable for three-phase

H. Hafezi; A. Jalilian

2006-01-01

134

Noninvasive detection of broken rotor bars in operating induction motors  

Microsoft Academic Search

A description is given of a computer-based noninvasive broken bar fault detector for squirrel-cage rotors of induction motors. The detector can be applied to existing motors without disassembly or shutdown and has the sensitivity to diagnose the presence of a single broken bar or an open end ring. It is suitable for monitoring the trend of the motor signature, or

G. B. Kliman; R. A. Koegl; J. Stein; R. D. Endicott; M. W. Madden

1988-01-01

135

A motor drive control system for the Lidar Polarimeter  

E-print Network

of an Armature-Con- trolled DC Motor. 2. 2 Block Diagram Representation of an Armature-Controlled DC Motor. 2. 3 Block Diagram Representation of the Scan System With Tachometer Feedback . . . . . . 12 2. 4 Block Diagram Representation of an Armature... systems were considered. The DC permanent mag- net motor was chosen over the synchronous and induction machine for the following reasons: a) For fractional horsepower machine, the DC motor is usually the least expensive. b) The DC motor had...

Leung, Waiming

2012-06-07

136

A five-level inverter topology with common-mode voltage elimination for induction motor drives  

Microsoft Academic Search

Common-mode voltages generated by PWM inverters in induction motor drives cause shaft voltages, bearing currents and ground leakage currents resulting into early mechanical failure of machine bearings and conducted EMI. A five-level inverter topology with switching state combination selection strategy for the PWM control is proposed for an open-end winding induction motor drive, which completely eliminates the common-mode voltages at

P. N. Tekwani; R. S. Kanchan; K. Gopakumar; A. Vezzini

2005-01-01

137

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

138

Energy conservation through improved design of induction motor  

SciTech Connect

To meet the increasing demand of energy crisis, attempts have been made by harnessing energy from renewable sources or by improving the operating efficiency of devices used in generation, transmission and utilization of electric energy. Induction motors are used in a very large number in a variety of applications. Any significant improvement in the operating efficiency of induction motor will, therefore, help their effort at energy conservation. The optimized design of induction motor using Rosenbrock`s method is carried out with the objective of minimizing (1) cost of active materials; (2) the cost of annual energy consumed and (3) the total annual cost.

Ayyub, M. [A.M.U. Aligarh, Utter Pradesh (India). Electrical Engineering Dept.; Murthy, S.S.; Singh, B.P. [Indian Inst. of Tech., New Delhi (India). Electrical Engineering Dept.

1995-12-31

139

Sensor-less Drive of Induction Motor Based on A New Hybrid Cascaded Multilevel Inverter  

Microsoft Academic Search

Power electronic inverters are becoming more and more popular for various industrial drive applications. Many kinds of multilevel inverter topologies have been proposed to enhance the performance of motor drive system during last two decades. In this paper, a sensor-less drive of induction motor based on a new hybrid cascaded multilevel and SVM controls are presented. In the proposed drive

Jianye Rao; Yongdong Li

2009-01-01

140

Speed control for synchronous motors  

NASA Technical Reports Server (NTRS)

Feedback circuit controls fluctuations in speed of synchronous ac motor. Voltage proportional to phase angle is developed by phase detector, rectified, amplified, compared to threshold, and reapplied positively or negatively to motor excitation circuit. Speed control reduces wow and flutter of audio turntables and tape recorders, and enhances hunting in gyroscope motors.

Packard, H.; Schott, J.

1981-01-01

141

Swarm Intelligence Algorithm for Induction Motor Field Efficiency Evaluation  

NASA Astrophysics Data System (ADS)

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

Sakthivel, V. P.; Subramanian, S.

142

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

2012-06-07

143

High efficient low cost induction motor drive for residential applications  

Microsoft Academic Search

Poor performance and low efficiency of conventional residential drives make it necessary to develop new methods for residential systems. In this paper a single-phase powered three-phase induction motor drive is considered for residential applications specifically washing machines. The drive consists of a buck-boost power factor correction (P.F.C.) circuit, an inverter with selective harmonic elimination (S.H.E.), and a three-phase induction motor.

J. S. Moghani; M. Heidari

2006-01-01

144

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

145

Transient effects in application of PWM inverters to induction motors  

Microsoft Academic Search

Standard squirrel cage induction (SCI) motors are subjected to nonsinusoidal waveshapes when supplied form adjustable-frequency inverters. In addition to causing increased heating, these wave patterns can be destructive to the insulation. In particular, pulse width modulated (PWM) inverter output amplitudes and rise times are investigated. Motor insulation capabilities are discussed. In this paper, voltage reflections are simulated for various cable

E. Persson

1992-01-01

146

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

147

A COMPLETE STATOR AND ROTOR RESISTANCE IDENTIFIER FOR INDUCTION MOTOR DRIVE USING FUZZY LOGIC AND ARTIFICIAL NEURAL NETWORKS  

Microsoft Academic Search

This paper presents a new method of on-line estimation for the stator and rotor resistances of the induction motor in the indirect vector controlled drive, using fuzzy logic and artificial neural networks. The back propagation algorithm is used for the training of the neural networks for rotor resistance identification. The error between the desired state variable of an induction motor

B. Karanayil; M. F. Rahman; C. Grantham

148

Soft Computing Application in Fault Detection of Induction Motor  

NASA Astrophysics Data System (ADS)

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.

2010-10-01

149

Magnetic levitation and propulsion system by single-sided linear induction motor  

Microsoft Academic Search

Magnetic levitation and propulsion systems have been studied and the gap length control and propulsion control characteristics are clarified. The voltage equation for the single-sided linear induction motor (SLIM) is derived with consideration of the gap length dependence. Also, the transfer function of the control system is obtained by the state variable method to clarify the characteristics of the gap

Shigeru Tanaka; Susumu Tadakuma

1980-01-01

150

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

E-print Network

/DC rectifiers and DC/AC inverters. The control objectives are threefold: (i) forcing the motor speed to track/AC inverter through a transformer and an AC/DC rectifier The connection line between the rectifier, undesirable current harmonics are likely to be generated in the AC line. These harmonics reduce the rectifier

Boyer, Edmond

151

Robust DSP-based efficiency optimization of a variable speed induction motor drive  

Microsoft Academic Search

This paper proposes a practical digital-signal-processor (DSP)-based algorithm for the online efficiency optimization of induction motor drives. The algorithm combines good features of the search control and loss-model-based control, while simultaneously eliminating their major drawbacks. It ensures very fast convergence without the need for any a priori knowledge of the motor loss-related parameters. The minimum loss operating point is decided

Slobodan N. Vukosavic; Emil Levi

2003-01-01

152

Condition Monitoring of Squirrel-Cage Induction Motors Fed by PWM -based Drives Using a Parameter Estimation Approach  

E-print Network

Condition Monitoring of Squirrel-Cage Induction Motors Fed by PWM -based Drives Using a Parameter oriented) control. The widely used squirrel-cage rotor aids in the robustness and economy of the drive. The main idea is that the apparent rotor resistance and leakage inductance of a squirrel-cage induction

Povinelli, Richard J.

153

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

154

Power control for ac motor  

NASA Technical Reports Server (NTRS)

A motor controller employing a triac through which power is supplied to a motor is described. The open circuit voltage appearing across the triac controls the operation of a timing circuit. This timing circuit triggers on the triac at a time following turn off which varies inversely as a function of the amplitude of the open circuit voltage of the triac.

Dabney, R. W. (inventor)

1984-01-01

155

Power control for ac motor  

NASA Astrophysics Data System (ADS)

A motor controller employing a triac through which power is supplied to a motor is described. The open circuit voltage appearing across the triac controls the operation of a timing circuit. This timing circuit triggers on the triac at a time following turn off which varies inversely as a function of the amplitude of the open circuit voltage of the triac.

Dabney, R. W.

1984-12-01

156

High Gain Observer for Induction Motor in Presence of Magnetic Hysteresis , L. Dugard3  

E-print Network

High Gain Observer for Induction Motor in Presence of Magnetic Hysteresis H. Ouadi1 , F. Giri2 , L in induction motors is considered in this paper. In most previous works, motor observers have been designed significant load torque changes. In this paper, a high gain observer is designed for induction motors based

Paris-Sud XI, Université de

157

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

158

Stable operation of induction-type bearingless motors under loaded conditions  

Microsoft Academic Search

A control method, which realizes stable operation in induction-type bearingless motors under loaded conditions, is proposed. Without a proposed control method, both the amplitude and the direction of radial force vary in accordance with loads. These variations result in interferences of radial force commands in two perpendicular axes. The interferences become a serious problem as a load increases. A shaft

Akira Chiba; Ryusaku Furuichi; Yoshiteru Aikawa; Ken Shimada; Yasuhisa Takamoto; Tadashi Fukao

1997-01-01

159

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

160

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

161

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

162

Studies on the use of conventional induction motors as self-excited induction generators  

Microsoft Academic Search

The suitability of using a normal three-phase induction motor as a capacitor self-excited induction generator (SEIG) is illustrated. The thermal limit of the stator windings being the limiting factor, the capacity of the SEIG is determined. The steady-state performance of such induction generators, maintaining a constant terminal voltage, is analyzed under resistive and reaction loads. Typical experimental results are also

S. S. Murthy; B. P. Singh; C. Nagamani; K. V. V. Satyanarayana

1988-01-01

163

Sensorless performance evaluation of induction motors  

E-print Network

3. 3. Generation of Saliency Induced Harmonics in the Motor Line Current. . . . . 27 3. 3. 1. Healthy Machine. 28 34 3. 5 3. 3. 2. Machine with Static Eccennicity 3. 3. 3. Machine with Dynamic Eccentricity. 3. 3. 4. Machine with Mixed... of a 1 hp motor. . . 12 Fig. 2. 2. Illustration of the theory of revolving permeanccs. . . 20 Fig. 2. 3. Instantaneous torque versus time for a 3 hp 28 bar machine (Top) full voltage, (Bottom) at a reduced voltage. 22 I'ig. 2. 4. Instantaneous...

Ahmed, Shehab

2012-06-07

164

Cognitive control in motor expertise  

Microsoft Academic Search

This article examines cognitive control in motor expertise. Extensive research in sport domains has shown that adult experts exhibit superior response selection performance (tactical decision making) as well as superior motor skill execution. Two mechanisms that contribute to expert performance are problem representations and gaze behavior strategies. These mechanisms are reviewed in terms of their development and role in expert

Sue L. McPherson; Joan N. Vickers

2004-01-01

165

Mechanical-sensorless induction motor drive based only on DC-link measurements  

Microsoft Academic Search

Sensor count reduction for high-performance induction motor (IM) drives is considered. A novel strategy to compute the three phase currents, based on a single current sensor and an adaptive observer, is proposed. The observer estimates the motor state variables, allowing then implementing an IM field-oriented controlled (FOC) drive with closed speed loop based only on DC-link measurements. To demonstrate the

M. O. Sonnaillon; G. Bisheimer; C. De Angelo; J. Solsona; G. O. Garc

2006-01-01

166

HTS axial flux induction motor with analytic and FEA modeling  

NASA Astrophysics Data System (ADS)

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

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

2013-11-01

167

Implementation of DSP Based Cost Effective Inverter Fed Induction Motor Drive with VisSim  

NASA Astrophysics Data System (ADS)

The implementation of a Digital Signal Processor (DSP) based high-performance cost effective fed Induction Motor drive with VisSim/Embedded Controls Developer (ECD) is presented in this paper. In the experimental work VisSim/ECD software automatically converts the in built block diagram to C code and compiles, links, and downloads the code to DSP processor TMS320F2812. The DSP processor generates the required PWM to a cost effective ie four switch 3-phase (FSTPI) inverter. The power circuit of FSTPI fed drive system consists of an IGBT based FSTPI bridge inverter module feeding to a 5 hp three-phase squirrel cage induction motor. In this work the speed of induction motor output is shown by the GUI of VisSim/ECD and SPWM pulses, line voltages and line current output curves are shown using digital storage oscilloscope to demonstrate the feasibility of the system.

Mohanty, Nalin K.; Muthu, Ranganath

2012-03-01

168

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

169

Speed estimate for maglev train based on linear induction motor  

Microsoft Academic Search

Maglev train is a new vehicle without support wheel and its movement speed is gained through a special measure equipment. The paper proposes a neural network arithmetic for the maglev train speed estimator which combines characteristics of its traction linear induction motor. The result of a dynamic simulation experiment shows that real speed measure is near to theory calculation. This

Shaoke Liu; Dengwu Wei; Guirong Chen

2008-01-01

170

Losses due to rotational flux in three phase induction motors  

Microsoft Academic Search

This paper discusses rotational losses and how they are produced in the core materials of induction motors. These losses are largely caused by flux that rotates in the plane of the machine laminations. This suggests that steel specification for applications to rotating machines should be given in terms of rotational loss data as a material characteristic, in much the same

R. D. Findlay; N. Stranges; D. K. MacKay

1994-01-01

171

Stability Analysis of a Rectifier-Inverter Induction Motor Drive  

Microsoft Academic Search

A stability study of a rectifier-inverter induction motor drive system is performed by neglecting the harmonic content of the stator voltages and applying Nyquist stability criterion to the small- displacement equations obtained by linearization about an operating point. This investigation reveals that system instability can occur over a wide speed range if the system parameters are improperly selected. It appears

Thomas Lipo; Paul Krause

1969-01-01

172

Induction Motor Operation With Non-Sinusoidal Impressed Voltages  

Microsoft Academic Search

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

L. A. Doggett; E. R. Queer

1929-01-01

173

Close up of backup exciter showing induction motor at left ...  

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

Close up of backup exciter showing induction motor at left and direct current generator at right. View to west - Mystic Lake Hydroelectric Facility, Powerhouse, Along West Rosebud Creek, 1 3/4 miles northeast of Mystic Lake Dam, Fishtail, Stillwater County, MT

174

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

175

Position Control of a Permanent Magnet DC Motor by Model Reference Adaptive Control  

Microsoft Academic Search

Model reference adaptive control (MRAC) is one of the various techniques of solving the control problem when the parameters of the controlled process are poorly known or vary during normal operation. To understand the dynamic behavior of a dc motor it is required to know its parameters; armature inductance and resistance (La, Ra), inertia of the rotor (Jm), motor constant

Muhammet Koksal; Fedai Yenici; Arif Nihat Asya

2007-01-01

176

Stator and rotor resistance observers for induction motor drive using fuzzy logic and artificial neural networks  

Microsoft Academic Search

This paper presents a new observer for the rotor resistance of an indirect vector controlled induction motor drive using artificial neural networks supplemented by a fuzzy logic based stator resistance observer. The error between the rotor flux linkages based on a neural network model and a voltage model is back propagated to adjust the weights of the neural network model

Baburaj Karanayil; Muhammed Fazlur Rahman; Colin Grantham

2005-01-01

177

On-line adaptive neural training algorithm for an induction motor flux observer  

Microsoft Academic Search

This paper presents a new algorithm for induction motor stator flux observation. The novel procedure is based on a neural network with on-line adaptive training. The network topology is a standard multilayer perceptron (MLP) network and the training algorithm is based on sliding mode control (SMC) theory. The main characteristic of this novel observer is the adaptability of the gain

A. Nied; S. I. S. Junior; G. G. Parma; B. R. Menezes

2005-01-01

178

Symmetrical and Asymmetrical H-Bridge Multilevel Inverter for DTC Induction Motor Drive  

E-print Network

Symmetrical and Asymmetrical H-Bridge Multilevel Inverter for DTC Induction Motor Drive Automotive--Several works have been reported in the literature on multilevel inverters topologies, control techniques drives associated to three-phase multilevel inverter. This paper presents then a comparison study

Paris-Sud XI, Université de

179

Speed estimation of an induction motor drive using an optimized extended Kalman filter  

Microsoft Academic Search

This paper presents a novel method to achieve good performance of an extended Kalman filter (EKF) for speed estimation of an induction motor drive. A real-coded genetic algorithm (GA) is used to optimize the noise covariance and weight matrices of the EKF, thereby ensuring filter stability and accuracy in speed estimation. Simulation studies on a constant V\\/Hz controller and a

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

2002-01-01

180

Concept for sleeve induction motor with 1-msec mechanical time constant  

NASA Technical Reports Server (NTRS)

Conductive sleeve induction motor having a 1-msec mechanical time constant is used with solid-state devices to control all-electric servo power systems. The servomotor rotor inertia is small compared to the maximum force rating of the servo motion, permitting high no-load acceleration.

Wiegand, D. E.

1968-01-01

181

A versatile stepping motor controller for systems with many motors  

SciTech Connect

A versatile system for controlling beamlines or complex experimental setups is described. The system as currently configured can control up to 32 motors, with all motors capable of full speed operation concurrently. 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. There is an emergency stop'' key on the front panel keyboard to stop the motion of all motors without losing track of the motors' position. 3 refs., 4 figs., 1 tab.

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

1989-01-01

182

Finite element 2D steady-state time harmonic field analysis of induction motor  

Microsoft Academic Search

This work describes a method of calculating the steady state harmonic field distribution of an induction motor. A finite element based model, which predicts the magnetic field throughout in induction motor during steady state conditions, is established. The harmonic components of magnetic field and the spatial distribution corresponding to each of the frequency components are calculated for an induction motor

Ajay Kumar; Sanjay Marwaha; Anupama Marwaha

2004-01-01

183

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

E-print Network

Induction Motors Bearing Failures Detection and Diagnosis Using a RBF ANN Park Pattern Based Method of bearing failure detection and diagnosis in induction motors. The proposed approach is a sensor on the stator current Park patterns. Induction motor stator currents are measured, recorded and used for Park

Paris-Sud XI, Université de

184

Control of a bidirectional Z-Source Inverter for hybrid electric vehicles in motoring, regenerative braking and grid interface operations  

Microsoft Academic Search

This paper presents a battery supplying a bidirectional Z-Source Inverter (ZSI) feeding a three phase induction motor. The indirect field-oriented control (IFOC) method is used to control the induction motor speed during motoring and regenerative braking operations. The IFOC is implemented based on PWM voltage modulation with voltage decoupling compensation. A dual loop controller is designed, based on a small

Omar Ellabban; Joeri Van Mierlo; Philippe Lataire

2010-01-01

185

Harmonic Torque Calculation of Induction Motors Using Electromagnetic Field Analysis  

NASA Astrophysics Data System (ADS)

In this paper, we investigate effects of harmonic electromagnetic field to torque characteristics of induction motors from both side of experiment and electromagnetic field analysis. The characteristics of two kinds of the aluminum cage three-phase induction motors are measured and calculated. One is with the closed rotor slots. The other is semi-closed. In the experiment, the negative torque at synchronous speed is measured by driving the induction motor by the synchronous permanent magnet motor. The total torque at load condition is also measured by the torque detector. In the analysis, the harmonic magnetic fields, the harmonic losses and the harmonic torques at each time and space harmonic order are calculated using the nonlinear time-stepping finite element method to clarify the mechanism of the harmonic torque generation. The measured and the calculated results agree well. It is clarified that the negative torque caused by the slot harmonics at the rated load condition is not negligible and that the negative torque is mainly generated by the harmonic core losses.

Yamazaki, Katsumi; Haruishi, Yoshihisa; Ara, Takahiro

186

Dynamic analyses of parallel operated self-excited induction generators feeding an induction motor load  

Microsoft Academic Search

This paper presents a novel approach based on eigenvalue and eigenvalue sensitivity analyses to predict dynamic performances of parallel operated self-excited induction generators (SEIGs) supplying an induction motor load. Numerous numerical methods based on steady-state equivalent-circuit models have been proposed to find the performances of a SEIG connected to static loads. In this paper, determination of minimum capacitance required for

Li Wang; Ching-Huei Lee

1999-01-01

187

Principles of self-excitation at radial force winding terminals in bearingless induction motors with a squirrel cage rotor  

Microsoft Academic Search

Bearingless induction motors with a squirrel cage rotor have two-pole motor windings and four-pole radial force windings. The four-pole winding currents generate the radial force, basically, however, real power can be also generated as an induction generator. It is shown that self-excitation occurs at radial force winding terminals with proper current injection. A control strategy for adjusting the power with

Kenichi Kobayashi; Makoto Yamashita; Akira Chiba; Tadashi Fukao

2000-01-01

188

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

189

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

190

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

191

Performances of bearingless and sensorless induction motor drive based on mutual inductances and rotor displacements estimation  

Microsoft Academic Search

A self-sensing bearingless motor is considered as an effective solution to reduce cost and shorten a shaft length. In this paper, a novel estimation method of a rotor displacement is proposed. The method is based on the detection of currents induced by mutual inductances, which vary as a function of the rotor displacements. A high-frequency carrier voltage is superimposed on

Takahiro Tera; Yoshikazu Yamauchi; Akira Chiba; Tadashi Fukao; M. Azizur Rahman

2006-01-01

192

Levitation and torque control of internal permanent magnet type bearingless motor  

Microsoft Academic Search

A general solution for levitation control applicable to permanent magnet (PM) synchronous and induction type rotating motors is presented. Levitation force is generated by the superposition of P+2 or P-2 pole magnetic flux with the usual motoring magnetic flux (pole number P). PM synchronous motors have the advantage that the control of rotation and levitation are independent, however, the levitation

Yohji Okada; Shigenobu Miyamoto; Tetsuo Ohishi

1996-01-01

193

Speed-sensorless control of switched-reluctance motors with uncertain payload  

E-print Network

the Blondel-Park transformation, widely used in control design for induction motors, permanent- magnetSpeed-sensorless control of switched-reluctance motors with uncertain payload Antonio Loría Gerardo-reluctance motors without velocity measurements and provide, to the best of our knowledge, the first result

Boyer, Edmond

194

Analysis of no-load characteristics of a bearingless induction motor  

Microsoft Academic Search

This paper presents the design and analysis of a bearingless squirrel cage induction motor. There are two sets of stator windings. The main winding is a four-pole arrangement, while the control winding is a two-pole type. The latter is utilized to produce radial forces on the rotor shaft. The two-pole winding currents are regulated by radial position sensors and control

Akira Chiba; Desmond T. Power; M. Azizur Rahman

1995-01-01

195

Evaluation of quasi-square wave inverter as a power source for induction motors  

NASA Technical Reports Server (NTRS)

The relative merits of quasi-square wave inverter-motor technology versus a sine wave inverter-motor system were investigated. The empirical results of several tests on various sizes of wye-wound induction motors are presented with mathematical analysis to support the conclusions of the study. It was concluded that, within the limitations presented, the quasi-square wave inverter-motor system is superior to the more complex sine wave system for most induction motor applications in space.

Guynes, B. V.; Haggard, R. L.; Lanier, J. R., Jr.

1977-01-01

196

Determination of Direct and Quadrature Axes Inductances of Reluctance Motors Taking into Account Cross Saturation  

NASA Astrophysics Data System (ADS)

The d-axis inductance of reluctance motor is affected by not only the d-axis current but also the q-axis current, because of cross magnetic saturation between the direct and quadrature axes. This situation is similar for the q-axis inductance. The authors propose a method to determine the d-axis inductance related to the d- and q-axis currents and the q-axis inductance related to the d- and q-axis currents from a standstill test. This method involves the following four steps. First a rectangular-wave voltage, alternated between plus and minus, is applied to the two armature winding terminals after braking the rotor in the d-axis position. Secondly the voltage and current between the terminals are measured. Thirdly the d-axis inductance related with d-axis current is calculated from the voltage and current. Finally the process above is repeated when a DC current flows from the remaining armature terminal to neutral point terminal and the d-axis inductance related to the d- and q-axis currents is derived. A similar treatment applies when determining the q-axis inductance related to the d-and q-axis currents in the q-axis rotor position. The method is implemented on a 1.1kW-178V- 6.3A-4P-2200min-1 flux barrier type reluctance motor. Results of load performance on a vector controlled reluctance motor measured by on-load tests and calculated from the d- and q-axis inductances obtained by the proposed method clearly demonstrate the validity of the proposed method.

Yamamoto, Shu; Ara, Takahiro

197

Cerebellum and ocular motor control.  

PubMed

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

198

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

199

Forward Models for Physiological Motor Control  

Microsoft Academic Search

Based on theoretical and computational studies it has been suggested that the central nervous system (CNS) internally simulates the behaviour of the motor system in planning, control and learning. Such an internal “forward” model is a representation of the motor system that uses the current state of the motor system and motor command to predict the next state. We will

R. C. Miall; Daniel M. Wolpert

1996-01-01

200

Microcomputer Control for Sensorless Brushless Motor  

Microsoft Academic Search

The microcomputer control of a brushless motor without a shaft position sensor is studied. A method which permits the determination of the permanent magnet rotor position by the back electromotive force (EMF) induced in the stator windings and the starting technique which uses the motor as a synchronous motor at standstill are explained. The motor voltage is chopped by commutator

Kenichi Iizuka; Hideo Uzuhashi; Minoru Kano; Tsunehiro Endo; Katsuo Mohri

1985-01-01

201

Tuning the stator resistance of induction motors using artificial neural network  

SciTech Connect

Tuning the stator resistance of induction motors is very important, especially when it is used to implement direct torque control (DTC) in which the stator resistance is a main parameter. In this paper, an artificial network (ANN) is used to accomplish tuning of the stator resistance of an induction motor. The parallel recursive prediction error and backpropagation training algorithms were used in training the neural network for the simulation and experimental results, respectively. The neural network used to tune the stator resistance was trained on-line, making the DTC strategy more robust and accurate. Simulation results are presented for three different neural-network configurations showing the efficiency of the tuning process. Experimental results were obtained for the one of the three neural-network configuration. Both simulation and experimental results showed that the ANN have tuned the stator resistance in the controller to track actual resistance of the machine.

Cabrera, L.A.; Elbuluk, M.E.; Husain, I. [Univ. of Akron, OH (United States). Dept. of Electrical Engineering] [Univ. of Akron, OH (United States). Dept. of Electrical Engineering

1997-09-01

202

Modeling and analysis of levitation force considering air-gap eccentricity in a bearingless induction motor  

Microsoft Academic Search

This paper presents modeling and analysis of levitation force considering air-gap eccentricity in a bearingless induction motor. By using nonlinear transient field analysis of finite element method (FEM), levitation force is calculated under air-gap eccentricity. An analytical analysis of interaction between harmonic field components due to air-gap eccentricity is put forward. A simplified modeling for levitation force control is developed

Wang Baoguo; Wang Fengxiang

2001-01-01

203

AMBIENTE INTEGRADO PARA ACIONAMENTO E CONTROLE DE MOTORES DE INDUÇÃO  

Microsoft Academic Search

This work proposes a PC-based environment for driving and control of induction motors. The main goal is to equip the user with an integrated environment which facilitates real time implementation and performance assessement of competing techniques under realistic conditions. A single microcomputer is employed for integrating all hardware and software resources, thence simplifying code generation considerably. Experimental results on PWM

Elder M. Hemerlyl; Hilton A. GrÜDdling; Luís Fernando; A. Pereira

1995-01-01

204

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.

2008-11-07

205

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

206

Speed sensorless field-orientation control of the induction machine  

Microsoft Academic Search

A speed estimation method for an induction machine and its application to a flux observer-based field orientation (FOFO) control system proposed previously is presented. The motor speed is estimated on the basis of the difference between two flux estimators. The convergence of the method is analyzed, and a novel pole assignment method is proposed. The speed estimator is applied to

Hirokazu Tajima; Yoichi Hori

1993-01-01

207

Fault classification for induction motor using Hilbert-based bispectral analysis and probabilistic neural networks  

Microsoft Academic Search

This paper addresses the development of a new sig- nal processing approach based on the fusion of Hilbert transform and bispectral analysis to extract features of defects in a number of induction motor conditions. The motor conditions considered are a normal motor and motors with outer, inner race and rotor faults. The signal processing techniques based on Hilbert transform have

D.-M. Yang

2011-01-01

208

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

209

Experimental investigation and measurement of the bearing current in a multilevel inverter-fed induction motor drive  

Microsoft Academic Search

The development of Space Vector Modulation (SVM) based AC adjustable speed drives (ASD's) has increased the inverter output AC voltage, performance, efficiency, and controllability in speed controlled induction motor applications. However due to fast switching of the MOSFETs\\/IGBT's, introduces the high frequency transients at the output of the inverter. In addition, due to non-sinusoidal voltage output at the inverter, there

B. Muralidhara; A. Ramachandran; R. Srinivasan; M. C. Reddy

2011-01-01

210

Servo Motor Position and Velocity Control Model  

NSDL National Science Digital Library

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

De La Torre, Luis; Oyarzun, Hector V.

2014-03-18

211

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.

212

Wind energy conversion system simulator using variable speed induction motor  

Microsoft Academic Search

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

S. W. Mohod; M. V. Aware

2010-01-01

213

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

E-print Network

in induction motor. Stator voltage and current in an induction motor were measured and employed for computation, play an important part in the field of electromechanical energy conversion. It is well machine is based on the monitoring of the stator current to detect sidebands around the supply frequency

Boyer, Edmond

214

Induction motor fault diagnosis based on neuropredictors and wavelet signal processing  

Microsoft Academic Search

Early detection and diagnosis of incipient faults is desirable for online condition assessment, product quality assurance and improved operational efficiency of induction motors running off power supply mains. In this paper, a model-based fault diagnosis system is developed for induction motors, using recurrent dynamic neural networks for transient response prediction and multi-resolution signal processing for nonstationary signal feature extraction. In

Kyusung Kim; Alexander G. Parlos

2002-01-01

215

Determination of the magnetic losses in induction motors based on the generalized Epstein test  

Microsoft Academic Search

The results obtained from the standard method for the characterization of magnetic materials - the Epstein test - lead to significant errors in the estimation of magnetic losses in induction motors. Among the induction motor characteristics not accounted for in the Epstein test method, one can point out: winding distribution, cutting stresses, anisotropy, PWM supply and rotor losses (surface losses

André G. Tôrres; B. J. C. Filho; R. O. C. Lyra; Marco A. Cunha; Sebastião C. Paolinelli

2004-01-01

216

Development of artificial neural network based fault diagnosis of induction motor dearing  

Microsoft Academic Search

The common component failure of induction motor is bearing. Thus, timely detection and diagnosis of induction motor bearing (IMB) is very crucial in order to prevent sudden damage. This paper proposes developing artificial neural network (ANN) model of IMB fault diagnosis by using Elman Network. The vibration signal obtained from Case Western Reserve University website are been used as input

Abd Kadir Mahamad; Takashi Hiyama

2008-01-01

217

Thermal effect of short-circuit current in low power induction motors  

Microsoft Academic Search

Diagnostic of reliability of induction motors (IM) is very important for industry. The article deals with the analyse of short-circuit currents in stator winding of low power induction motors which can strongly affected reliability of IMs. The occurrence of short-circuit arises when some parts of the insulation system of a stator winding breakdown. The stator winding loses a part of

L. Beran

2008-01-01

218

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; Cortes, Juan Camilo

2012-01-01

219

Motor vehicle pollution control: A global perspective  

SciTech Connect

This book is a compilation of papers presented at a meeting on motor vehicle pollution control. Topics covered include the following: worldwide developments in motor vehicle pollution control; the Brazillian control program; motor vehicle pollution control in Canada; pollution by exhaust gases in Kuwait; performance of vehicles with or without catalyst; legislation on automotive emissions; European exhaust emission standards; Pollution control and regulations for motor vehicles in Sweden; Progress towards a European market for exhaust emissions catalysts; and infrared emissions measurements at high altitude.

Not Available

1987-01-01

220

Analytical analysis of single- and three-phase induction motors  

SciTech Connect

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

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

1998-09-01

221

Loss Calculation of Induction Motors Considering Harmonic Electromagnetic Fields in Stator and Rotor  

NASA Astrophysics Data System (ADS)

A method of loss calculation for induction motors is proposed. The combined 3D-2D time stepping finite element analysis is carried out to obtain the copper loss and the time-variation of the magnetic field in the motor. The iron loss is calculated approximately considering the time-variation of the magnetic field direction and the minor hysteresis loops caused by the time-harmonic fields using practical computer resources. The proposed method is applied to 4 types of induction motors, which are the solid rotor induction motors with/without slot and the cage induction motors with/without skew. The measured and the calculated total losses and the iron losses agree well in all cases. The differences of the loss distributions of each motor are also compared and investigated.

Yamazaki, Katsumi

222

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

223

Vectorial Command of Induction Motor Pumping System Supplied by a Photovoltaic Generator  

NASA Astrophysics Data System (ADS)

With the continuous decrease of the cost of solar cells, there is an increasing interest and needs in photovoltaic (PV) system applications following standard of living improvements. Water pumping system powered by solar-cell generators are one of the most important applications. The fluctuation of solar energy on one hand, and the necessity to optimise available solar energy on the other, it is useful to develop new efficient and flexible modes to control motors that entrain the pump. A vectorial control of an asynchronous motor fed by a photovoltaic system is proposed. This paper investigates a photovoltaic-electro mechanic chain, composed of a PV generator, DC-AC converter, a vector controlled induction motor and centrifugal pump. The PV generator is forced to operate at its maximum power point by using an appropriate search algorithm integrated in the vector control. The optimization is realized without need to adding a DC-DC converter to the chain. The motor supply is also ensured in all insolation conditions. Simulation results show the effectiveness and feasibility of such an approach.

Makhlouf, Messaoud; Messai, Feyrouz; Benalla, Hocine

2011-01-01

224

A multilevel inverter system for an induction motor with open-end windings  

Microsoft Academic Search

In this paper, a multilevel inverter system for an open-end winding induction motor drive is described. Multilevel inversion is achieved by feeding an open-end winding induction motor with two two-level inverters in cascade (equivalent to a three-level inverter) from one end and a single two-level inverter from the other end of the motor. The combined inverter system with open-end winding

V. T. Somasekhar; K. Gopakumar; M. R. Baiju; Krishna K. Mohapatra; L. Umanand

2005-01-01

225

Loss Distribution of Three-Phase Induction Motor and BLDC Motor According to Core Materials and Operating  

Microsoft Academic Search

This paper deals with the loss distribution of a three-phase induction motor (IM) and a BLDC motor considering operating point-of-core material based on the FEA and experiments. In order to increase motor efficiency, a high grade of core material can be used. However, sometimes it decreases or provides no improvement of efficiency. This is due to the fact that high-grade

S. O. Kwon; J. J. Lee; B. H. Lee; J. H. Kim; K. H. Ha; J. P. Hong

2009-01-01

226

Failure identification and analysis for high-voltage induction motors in the petrochemical industry  

Microsoft Academic Search

This paper gives a synopsis of condition monitoring methods, both as a diagnostic tool and as a technique for failure identification in high-voltage induction motors in industry. New operating experience data for 483 motor units consisting of 6135 unit years are registered and processed statistically to ascertain the connection between motor data, protection and condition monitoring methods, maintenance philosophy and

Olav Vaag Thorsen; Magnus Dalva

1999-01-01

227

Protection of squirrel-cage induction motor utilizing instantaneous power and phase information  

Microsoft Academic Search

A method of protecting a squirrel-cage induction motor by checking its condition before starting and while running is presented. The check before running is made by successively connecting the windings of the motor to an impulse generator and analyzing the resulting current and voltage. The running motor is checked by monitoring the AC-component of the power signals in all three

Reinhard Maier

1992-01-01

228

Wireless Control and Communication to Motor Protection Relays by using an Embedded Microprocessor  

Microsoft Academic Search

Newelec (Pty) Ltd is a three-phase induction motor protection relay manufacturer. The function of the protection relay is to capture running data, to provide protection, to control a motor and to communicate this data to the SCADA system in a control room. The protection relays are equipped with communication facilities to be used in an instrumentation environment. The ideal cost

Abraham Jacobus Johannes Mouton; C. Smith; G. E. Smith

2006-01-01

229

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

230

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

E-print Network

Induction Motor Fault Diagnosis Using a Hilbert-Park Lissajou's Curve Analysis and Neural Network is simple. This analysis offers an easy interpretation to conclude on the induction motor condition and its with an aim of classifying automatically the various states of the induction motor. This approach was applied

Paris-Sud XI, Université de

231

Original Articles Geometric Control of Cardiomyogenic Induction  

E-print Network

Original Articles Geometric Control of Cardiomyogenic Induction in Human Pluripotent Stem Cells influences extraembryonic endoderm (ExE) commitment and cardiac inductive properties. hESC aggregates were-free cardiac induction system, that robust and efficient cardiac differentiation is a function of endogenous Ex

Zandstra, Peter W.

232

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

233

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 56, NO. 2, MARCH 2007 519 Advanced Fault-Tolerant Control of Induction-Motor  

E-print Network

EVs (HEVs), where the drive system must feature, among others, high reliability and robustness for var to illustrate the fault-tolerance consistency: sliding mode for encoder-based control and fuzzy logics (fuzzy

Paris-Sud XI, Université de

234

An accurate dc motor speed control system  

Microsoft Academic Search

A dc motor speed control system that uses an oscillator as a frequency reference is described. It provides control with an accuracy determined solely by that of the oscillator. The motor drives a disk with 72 holes which are counted down in a 12 stage binary up\\/down counter. The cycles of the reference oscillator signal are counted up in the

L. Stellema

1974-01-01

235

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

236

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

2012-06-07

237

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

238

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

239

Development of ANN for Diagnosing Induction Motor Bearing Failure  

NASA Astrophysics Data System (ADS)

Today, various diagnosis methods exist to diagnose bearing failure in industries such as artificial neural network (ANN), fuzzy logic, genetic algorithm and statistical analysis. This paper proposes the development of ANN model of induction motor bearing (IMB) fault diagnosis using different network types and structures. In this case Feedforward Neural Network (FFNN) and Elman Network types with Multiple Input Single Output (MISO) and Multiple Input Multiple Output (MIMO) structures were studied. The raw data used in this work was obtained from the Case Western Reserve University website in form of vibration signal. During pre-processing stage, Fast Fourier Transform (FFT) and enveloping techniques were applied to raw data before it was fed to features extraction stage. A total of 16 features were extracted from both time and frequency domain respectively. Subsequently, a distance evaluation technique was used for features selection, where 9 salient features were selected for ANN fault diagnosis. In the development of ANN fault diagnosis, FFNN and Elman Network were utilized with training algorithm of Levenberg Marquart Backpropagation. The result indicates the performance of classified IMB fault by using MIMO Elman structure which was better compared to other combination structures.

Mahamad, Abd Kadir; Hiyama, Takashi

240

Field oriented control of induction machines employing rotor end ring current detection  

Microsoft Academic Search

The usual method of induction motor torque control uses the indirect field orientation principle in which the rotor speed is sensed and slip frequency is added to form the stator impressed frequency. Unfortunately, the rotor resistance varies as the motor heats up under load thereby changing the rotor time constant which has a deleterious effect on the torque response. In

T. Matsuo; V. Blasko; J. C. Moreira; T.A. Lipo

1994-01-01

241

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

242

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

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

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

243

Flueric-controller pneumatic stepping motor system  

NASA Technical Reports Server (NTRS)

Nutating stepping motor consists of an output rotating gear and a nutating gear. A flueric logic circuit controls the nutating motor. The complete system constitutes a reliable, open loop actuator system with inherently high output stiffness, reasonable slewing speeds and small step size.

Dustin, M. O.; Griffin, W. S.; Wallhagen, R. E.

1970-01-01

244

Oscillation control system for electric motor drive  

DOEpatents

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

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

1988-01-01

245

A neural network approach to real-time condition monitoring of induction motors  

Microsoft Academic Search

A neural network-based incipient fault detector for small and medium-size induction motors is developed. The detector avoids the problems associated with traditional incipient fault detection schemes by employing more readily available information such as rotor speed and stator current. The neural network design is evaluated in real time in the laboratory on a 3\\/4 hp permanent magnet induction motor. The

MO-yuen Chow; Peter M. Mangum; Sui Oi Yee

1991-01-01

246

Use of fuzzy inference system for condition monitoring of induction motor  

NASA Astrophysics Data System (ADS)

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

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

2012-09-01

247

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

on a Squirrel Cage Induction Motor by the Finite ElementMethod Chang-Hoon Juri and Alain Nicolas CEGELY, UPRESA squirrel cage induction motor. We considered the magnetic forces and the centrifugal forces as sources and stresses, induction motor. 1.INTRODUCTION In the squirrel cage induction motors, the torque is obtained

Paris-Sud XI, Université de

248

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

249

Three-phase induction motor integrated with a magnetic frequency changer  

NASA Astrophysics Data System (ADS)

The new solution of the high-speed induction motor model is presented. The basic structural part of the motor is magnetic circuit with non-linear elements in which the third harmonic of the flux is generated. The finite element method is used to solve the coupled equations for the magnetic field, the stator windings and conductors of the rotor.

Goleman, Ryszard

2003-01-01

250

Development of a cryogenic induction motor for use with a superconducting magnetic bearing  

E-print Network

of a superconducting magnetic bearing (SMB). Both the motor and the SMB are operated at liquid He temperatures. We give and low noise. We have constructed an induction motor to drive the rotor of the SMB. In this paper we and the SMB are mounted on the cold plate of a liquid helium cryostat. The rotor of the SMB is a sintered Nd

Oxley, Paul

251

A review of induction motors signature analysis as a medium for faults detection  

Microsoft Academic Search

This paper is intended as a tutorial overview of induction motors signature analysis as a medium for fault detection. The purpose is to introduce in a concise manner the fundamental theory, main results, and practical applications of motor signature analysis for the detection and the localization of abnormal electrical and mechanical conditions that indicate, or may lead to, a failure

Mohamed El Hachemi Benbouzid

2000-01-01

252

THE EFFECTS OF TORSIONAL ELEMENTS ON THE TRANSIENT PERFORMANCE OF LARGE INDUCTION MOTOR DRIVES  

Microsoft Academic Search

In the modelling of induction motor drives it is common to choose only a first order representation of the torsional elements of the motor drive. When there is a requirement for more detailed information on the behaviour of the torsional elements of the drive a method of analysis is often chosen which inherently suppresses the important features of interaction between

GEORGE W. BUCKLEY

1980-01-01

253

Broken rotor bar fault detection in induction motors using Wavelet Transform  

Microsoft Academic Search

The Fast Fourier Transform (FFT) method is successfully used for the broken rotor bar fault detection purpose in the induction machines. It is based on the common-steady state analysis of the motor. This method is successfully used with Motor Current Signature Analysis (MCSA) technique for last three decades. However, this method is suffered from some serious drawbacks such as; it

Khadim Moin Siddiqui; V. K. Giri

2012-01-01

254

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

255

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

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

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

256

Function Cost of Low-power, Three-phase Squirrel-cage Induction Motors  

Microsoft Academic Search

This short paper looks at the function costing of low-power, three-phase squirrel-cage induction motors. Function costing is the estimation of the costs of engineering systems from the quantified functions performed by their elements. For the motors considered, the cost is largely proportional to the full-load output torque, with only a small variation attributable to the pole number. However, two-pole motors

M. J. FRENCH; C. A. STOKES; M. B. WIDDEN

1993-01-01

257

Magnetic field and equivalent circuit of induction motors with shielded poles  

Microsoft Academic Search

The magnetic field distribution in the air gap of induction motors with shielded poles is calculated, taking into account forward and backward harmonics as well as their skew. An analysis is made on the basis of theoretically or experimentally determined magnetic induction (flux density) rather than by the method of symmetrical components. Measurements were made with a search coil along

V. I. Katkyavichyus; I. V. Bukshnaytis; D. K. Banite

1984-01-01

258

Motor vehicle fuel vapor emission control assembly  

SciTech Connect

This patent describes a motor vehicle fuel vapor emission control assembly. It comprises fuel vapor emission control means and structural vehicle support means integral with the motor vehicle for providing structural support for the motor vehicle, the fuel vapor emission control means being for controlling emissions of fuel vapor from the motor vehicle. It comprises adsorption means for releasably adsorbing fuel vapors from a fuel reservoir of the vehicle; housing means for containing such adsorption means, the housing means being positioned within a hollow in a structural member of the structural vehicle support means; and vapor communication means for communicating fuel vapor from the reservoir to the adsorption means within the housing means and for communicating fuel vapor from within the housing means to a fuel burning engine of the vehicle.

Oslapas, A.G.

1991-10-29

259

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

Microsoft Academic Search

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

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

2011-01-01

260

Global trends in motor vehicle pollution control  

SciTech Connect

The purpose of this paper is to review and summarize recent trends around the world regarding motor vehicle pollution control. It shows the persistence of and in some cases worsening of motor vehicle related pollution problems, the increasing spread of advanced pollution control technologies including catalytic converters to address these problems, and the push to extend the capability of these advanced technologies to attain even lower pollution levels under a greater variety of actual operating conditions. The impact on global warming is assessed.

Walsh, M.P.

1989-01-01

261

Motor Control STEVEN P. WISE  

E-print Network

, brain stem, and spinal cord. A. Peripheral Motor System 1. Muscles Skeletal muscles consist to that of an agonist. central pattern generator Neural network in the central nervous system that produces rhythmic. inverse dynamics Computation of muscle activations and forces needed to reach a goal. inverse kinematics

Shadmehr, Reza

262

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

263

Equivalent Circuits for Single-Phase Induction and Hysteresis Motors  

Microsoft Academic Search

General steady-state equivalent circuits are derived for the family of single-phase motors with unequal contrarotating magnetic fields produced by one or two stator windings and\\/or stator saliency, and rotor torque due to hysteresis and\\/or eddy- current action. The derivation of an equivalent quadrature motor, first shown by Kron, is extended to the range of motors under consideration. The idealized treatment

Denis O'Kelly

1971-01-01

264

A Novel Magnetic Suspension-Force Compensation in Bearingless Induction-Motor Drive With Squirrel-Cage Rotor  

Microsoft Academic Search

This paper presents an improved analysis of magnetic force compensation in a bearingless induction motor with a squirrel-cage rotor. The expressions for air-gap flux linkages are derived. Simulation blocks of suspension force are constructed. A novel control system, which compensates the delay and direction error in suspension force generation for a squirrel-cage rotor, is proposed. The efficacy of the proposed

Taishi Hiromi; Tatsuya Katou; Akira Chiba; M. Azizur Rahman; Tadashi Fukao

2007-01-01

265

Stepper motor control that adjusts to motor loading  

NASA Technical Reports Server (NTRS)

A system and method are provided for controlling a stepper motor having a rotor and a multi-phase stator. Sinusoidal command signals define a commanded position of the motor's rotor. An actual position of the rotor is sensed as a function of an electrical angle between the actual position and the commanded position. The actual position is defined by sinusoidal position signals. An adjustment signal is generated using the sinusoidal command signals and sinusoidal position signals. The adjustment signal is defined as a function of the cosine of the electrical angle. The adjustment signal is multiplied by each sinusoidal command signal to generate a corresponding set of excitation signals, each of which is applied to a corresponding phase of the multi-phase stator.

Howard, David E. (Inventor); Nola, Frank J. (Inventor)

2000-01-01

266

Motor Control Systems And Fiber Optic Technology  

NASA Astrophysics Data System (ADS)

The evolutionary incorporation of fiber optic technology in the remote operation of motor control systems is described in this paper. The program is proposed for naval application. The research and development was sponsored and funded by Ingalls Independent Research and Development (IRAD) funds. Shipboard installation was sponsored by the Naval Sea Systems Command (NAVSEA) PMS-400C. It represents the first significant effort to employ light in the remote operation of motor control functions found aboard a naval vessel. Although focused on one ship class, the program's achievements apply to most naval and commercial ships as well as many nonseagoing systems. The operational requirements of the local and remote station transceivers employed in motor control systems are presented in this paper. These include the network topology and electro-optic control, switching, and indicator circuits of several fiber optic motor control system design evolutions. The designs were all driven by operational requirements. Engineering options and design conclusions are presented. Resulting conclusions are that the use of fiber optic technology in the remote operation of naval shipboard motor control systems is both feasible and practical. It provides significant weight, EMI, and safety advantages over existing systems yet its installation, operation, and maintenance can be performed by existing personnel with little additional training.

Stewart, R. C.

1989-02-01

267

Exoskeletons for Rehabilitation and Motor Control  

Microsoft Academic Search

Exoskeletons are mechatronic systems worn by a person in such a way that the physical interface permits a direct transfer of mechanical power and exchange of information. These robotic mechanisms have been applied in telemanipulation, man-amplifier, rehabilitation and to assist impaired human motor control. In addition, the neuromotor control research can benefit from an exoskeleton in order to manipulate human

A. F. Ruiz; A. Forner-Cordero; E. Rocon; J. L. Pons

2006-01-01

268

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

269

New advanced control methods for doubly salient permanent magnet motor  

Microsoft Academic Search

High performance and high efficiency in adjustable speed drives are needed and new motor constructions are investigated and analyzed world wide. This paper deals with advanced control of a doubly salient permanent magnet (DSPM) motor. The construction of the DSPM motor is shown and a dynamical model of the motor is used for simulations. As supply to the DSPM motor,

Frede Blaabjerg; Leif Christensen; P. O. Rasmussen; L. Oestergaard; P. Pedersen

1995-01-01

270

Rail Brake System Using a Linear Induction Motor for Dynamic Braking  

NASA Astrophysics Data System (ADS)

One type of braking system for railway vehicles is the eddy current brake. Because this type of brake has the problem of rail heating, it has not been used for practical applications in Japan. Therefore, we proposed the use of a linear induction motor (LIM) for dynamic braking in eddy current brake systems. The LIM reduces rail heating and uses an inverter for self excitation. In this paper, we estimated the performance of an LIM from experimental results of a fundamental test machine and confirmed that the LIM generates an approximately constant braking force under constant current excitation. At relatively low frequencies, this braking force remains unaffected by frequency changes. The reduction ratio of rail heating is also approximately proportional to the frequency. We also confirmed that dynamic braking resulting in no electrical output can be used for drive control of the LIM. These characteristics are convenient for the realization of the LIM rail brake system.

Sakamoto, Yasuaki; Kashiwagi, Takayuki; Tanaka, Minoru; Hasegawa, Hitoshi; Sasakawa, Takashi; Fujii, Nobuo

271

Analysis of a new 5-phase bearingless induction motor  

Microsoft Academic Search

This paper addresses the bearingless motor with a single set of multiphase windings. The interaction between M and M?1 pole-pair magnetic fields produces radial force. Based on this principle, a bearingless machine is obtained. Conventional\\u000a bearingless machine has dual windings, levitation windings and torque windings, which produce the two magnetic fields. In\\u000a the proposed bearingless motor, the two needed magnetic

Jin Huang; Min Kang; Jia-qiang Yang

2007-01-01

272

Control of self-excited induction generators  

Microsoft Academic Search

In this paper, experimental results on the self excitation of induction generators have been investigated to obtain a secure and stable power generation. A micro power simulator which consists of a small-scale synchronous generator (0.5 kW) and a squirrel cage induction generator (0.4 kW) controlled by a servomotor and an equivalent LC network of the transmission line is successfully used

F. Naito; K. Abe

2002-01-01

273

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

274

Molecular motors: design, mechanism and control  

E-print Network

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

Debashish Chowdhury

2007-09-12

275

A novel solid-state integrated protection system for three phase induction motors  

Microsoft Academic Search

The conventional electro-mechanical and static protective devices used for the protection of three phase Induction motors in Industrial applications normally employ separate and Independent overload, short circuit, earth fault and single phasing protective devices In the circuit breaker to take care of motor protection. The proposed all-In-one protection scheme Integrates these Into a single static protective device and operates by

T. K. Chatteijee; D. K. Mittra; S. Mahata; S. Kareddy

2009-01-01

276

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

Microsoft Academic Search

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

Mohamed El Hachemi Benbouzid; Gerald B. Kliman

2003-01-01

277

A high-speed induction motor making use of the third harmonic of the magnetic flux  

NASA Astrophysics Data System (ADS)

This paper indicates some possibilities of construction of high-speed induction motors taking advantage of the magnetic flux third harmonic due to a process of magnetization of nonlinear magnetic circuits. Configurations of magnetic frequency triplers, which can be used as basic stator structures and generate a distorted flux, are presented. The paper also describes an experimental high-speed induction motor supplied from a single-phase source via a magnetic frequency tripler that make possible to obtain a rotating field having a synchronous speed equal to 9000 rpm at a supply voltage angular frequency of 314 rd.

Goleman, Ryszard

1994-05-01

278

Mathematical Modelling of Induction Motor Transient Processes During Stator Winding Interruption  

NASA Astrophysics Data System (ADS)

This research presents induction motor mathematical model in coordinate axis's ?, ?, which allows to learn transient processes in rotor and stator circuits in the conditions of stator windings opening. Such kind of researches is nowadays actual due to impossibility of main calculated values measuring directly, but only on the stator terminals. Induction motor mathematical model forms Park-Gorev equations in ?, ? coordinate axis. It is preferable to use this coordinate system because it allows comparing the results of mathematical modeling in one of the phases with experimental data without transformations.

Konuhova, Marina; Orlovskis, Guntis; Ketners, Karlis

2010-01-01

279

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)

2008-01-01

280

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

281

Modeling and analysis of a Multistage Linear Induction Motor fed by a permanent magnet flywheel motor-generator  

Microsoft Academic Search

In the present paper the authors analyze the dynamic behavior of a Multistage Linear Induction Motor (MLIM) fed by means of a suitable back-to-back converter supplied through a flywheel energy source. The MLIM is used as a heavy mass launcher. The final velocity is several tens of m\\/s. Regenerative braking mode is also studied, as well as the shuttle recovering

G. Becherini; S. Di Fraia; B. Tellini

2010-01-01

282

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

283

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

284

Adaptive Internal Models for Motor Control  

E-print Network

Adaptive Internal Models for Motor Control and Visual Prediction Der Technischen Fakultät der together with Birthe Babies and Lorenz Gerstmayr on our way through the long hallways of Bielefeld during his diploma thesis, the software implementation of the model is mainly his work. Christian Dax

Moeller, Ralf

285

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

286

Early Estimation of Faults in Induction Motors Using Symbolic Dynamic-Based Analysis of Stator Current Samples  

Microsoft Academic Search

Even though induction motors are frequently used electromagnetic devices in industries owing to their high reliability, high efficiency, and low maintenance requirements, they are prone to various faults and failures. Most of these faults occurring in the induction motors are perceptible in nascent stages. This averts the inopportune machine failures and helps to adeptly plan the main- tenance schedules. Most

R. A. Gupta; A. K. Wadhwani; S. R. Kapoor

2011-01-01

287

Experimental measurement of shaft voltage and bearing current in an inverter fed three phase induction motor drive  

Microsoft Academic Search

With Pulse Width Modulation (PWM) inverter driven induction motors (IM) both internally and externally sourced bearing currents may exists (1). Currents flowing through induction motor bearings have the potential of creating premature bearing failures. IM powered by using PWM voltage source inverters (VSI) will generate high frequency noise voltage with respect to ground (gnd). Due to fast switching action of

B. Muralidhara; A. Ramachandran; R. Srinivasan; M. C. Reddy

2011-01-01

288

The role of attention in motor control.  

PubMed

Research on the focus of attention (FOA) in motor control has found a consistent advantage for focusing externally (on the effects of one's actions) compared to focusing internally (on one's body mechanics). However, most of this work has concentrated on movement outcomes, leaving open the question of how external attention changes the movement itself. Somewhat paradoxically, recent research has found that external attention also increases trial-by-trial movement variability. To explain these findings, we propose a theory of attention in motor control, grounded in optimal control theory, wherein variability is minimized along attended aspects of the movement. Internal attention thus reduces variability in individual bodily dimensions (positions and velocities of effectors), whereas external attention minimizes variability in the task outcome. Because the goal of a task defines a dimension in the movement space that is generally oblique to bodily dimensions, external attention should increase correlations among bodily dimensions while allowing their individual variances to grow. The current experiment tests these predictions in a dart-throwing task. External FOA led to more accurate performance and increased variability in the motion of the throwing arm, concomitant with stronger correlations among bodily dimensions (shoulder, elbow, and wrist positions and velocities) in a manner consistent with the task kinematics. These findings indicate a shift in the control policy of the motor system, consistent with the proposed theory. These results suggest an important role of attention as a control parameter in the regulation of the motor system, and more broadly illustrate the importance of cognitive mechanisms in motor behavior. PMID:23647310

Lohse, Keith R; Jones, Matt; Healy, Alice F; Sherwood, David E

2014-04-01

289

A universal computer control system for motors  

NASA Astrophysics Data System (ADS)

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.

1991-09-01

290

[Development and training of monocular motor control].  

PubMed

Misalignment of the visual axes of the eyes observed in strabismus may result from sensory, motor, and/or central nervous system disorders. The functional properties of a technique designed to increase, through training, the monocular motor control of normal human subjects was evaluated, the ultimate goal being obviously to apply the technique to cases of minor strabismus. The subject is seated in front of a television screen. A diaphragm extending from the subject's head to the screen divides the picture into two visually separated half fields. A micro-computer was programmed to project two patterns on the screen, made up of vertical green and grey bars (spatial frequency, 3 deg.). Displacement of the two visually superposable half fields could be independently achieved. The subject's task was to fixate, with one eye, the corresponding half field maintained stationary and track, with the other eye, the motion of the second half field. Perfect fusion of the two half fields has to be preserved during movements of the mobile half field over 2 to 6 degrees at a frequency of 0.4 Hz. The results show that after a few training sessions, subjects developed a high gain monocular motor control. This observation suggests that the method may be used as therapy to correct minor strabismus with or without anomalous retinal correspondence, and offers the possibility to study static and dynamic characteristics of Panum's areas and particularly their modifications as a function of training of monocular motor control. PMID:6663031

Gauthier, G M; Marchetti, E; Piron, J P; Vercher, J L

1983-01-01

291

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

Code of Federal Regulations, 2010 CFR

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

2010-10-01

292

Analysis and Simplified Representations of a Rectifier-Inverter Induction Motor Drive  

Microsoft Academic Search

Simplified representations of a rectifier-inverter induction motor drive system are established and verified by comparing the results obtained from a computer study using these representations to those obtained using a detailed simulation of the system. It is shown that when all harmonic components are neglected the static drive system may be conveniently represented in the synchronously rotating reference frame. The

Paul Krause; Thomas Lipo

1969-01-01

293

Energy consumption and losses calculation approach for different classes of induction motor drives  

Microsoft Academic Search

The paper deals with development of program block for estimation of energy consumption by induction motor drive. The block is created in MATLAB\\/Simulink application. The block topology, parameter-setting window and equations used in block are shown. The proposed method used in drive simulation allows estimating consumed energy, energy losses and energy efficiency of different drive systems. The calculation results with

I. Braslavsky; Z. Ishmatov; Y. Plotnikov; I. Averbakh

2006-01-01

294

Current signature analysis of induction motor mechanical faults by wavelet packet decomposition  

Microsoft Academic Search

This paper presents a novel approach to induction motor current signature analysis based on wavelet packet decomposition (WPD) of the stator current. The novelty of the proposed method lies in the fact that by using WPD method the inherent nonstationary nature of stator current can be accurately considered. The key characteristics of the proposed method are its ability to provide

Zhongming Ye; Bin Wu; Alireza Sadeghian

2003-01-01

295

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

296

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

Microsoft Academic Search

This paper describes a new analytical model for the influence of rolling-element bearing faults on induction motor stator current. Bearing problems are one major cause for drive failures. Their detection is possible by vibration monitoring of characteristic bearing frequencies. As it is possible to detect other machine faults by monitoring the stator current, a great interest exists in applying the

Martin Blodt; Pierre Granjon; Bertrand Raison; Gilles Rostaing

2008-01-01

297

Estimation of the running speed and bearing defect frequencies of an induction motor from vibration data  

Microsoft Academic Search

This paper presents two separate algorithms for estimating the running speed and the bearing key frequencies of an induction motor using vibration data. Bearing key frequencies are frequencies at which roller elements pass over a defect point. Most frequency domain-based bearing fault detection and diagnosis techniques (e.g. envelope analysis) rely on vibration measurements and the bearing key frequencies. Thus, estimation

Hasan Ocak; Kenneth A Loparo

2004-01-01

298

Optimal efficiency analysis of induction motors fed by variable-voltage and variable-frequency source  

Microsoft Academic Search

The authors discuss the efficiency analysis and experimental data for an induction motor fed by a variable-voltage and variable-frequency (VVVF) source. Nonideal factors (core saturation, source harmonics, and skin effect) affecting the efficiency are included in the analysis to yield practical results from computer simulation. Based on the simulated results, an experimental system, composed of a DC link power converter

SEN CHEN; S.-N. Yeh

1992-01-01

299

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

Microsoft Academic Search

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

K. Samidurai; K. Thanushkodi

2010-01-01

300

Design and simulation of a photovoltaic induction motor coupled water pumping system  

Microsoft Academic Search

Efficiency is the sense of energy saving is a main issue in photovoltaic pumping. The objective of this work is to design and simulate an efficient battery less pumping system powered from photovoltaic panels, comprising a new push-pull converter with Induction Motor. In a photovoltaic pump-storage system, solar energy is stored, when sunlight is available as potential energy in water

2012-01-01

301

Rail Brake System Using a Linear Induction Motor for Dynamic Braking  

Microsoft Academic Search

One type of braking system for railway vehicles is the eddy current brake. Because this type of brake has the problem of rail heating, it has not been used for practical applications in Japan. Therefore, we proposed the use of a linear induction motor (LIM) for dynamic braking in eddy current brake systems. The LIM reduces rail heating and uses

Yasuaki Sakamoto; Takayuki Kashiwagi; Minoru Tanaka; Hitoshi Hasegawa; Takashi Sasakawa; Nobuo Fujii

2009-01-01

302

Broken rotor bar fault detection in induction motors using starting current analysis  

Microsoft Academic Search

Fault detection based on a common steady-state analysis technique, such as FFT, is known to be significantly dependant on the loading conditions of induction motors. At light load, it is difficult to distinguish between healthy and faulty rotors because the characteristic broken rotor bar fault frequencies are very close to the fundamental component and their amplitudes are small in comparison.

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

2005-01-01

303

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

NASA Astrophysics Data System (ADS)

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

Kang, Myeongsu; Kim, Jong-Myon

2013-12-01

304

Offline Parameter Estimation of Induction Motor Using a Meta Heuristic Algorithm  

NASA Astrophysics Data System (ADS)

An offline parameter estimation problem of an induction motor using a well known, efficient yet simple meta heuristic algorithm DEGL (Differential Evolution with a neighborhood based mutation scheme) has been presented in this article. Two different induction motor models such as approximate and exact models are considered. The parameter estimation methodology describes a method for estimating the steady-state equivalent circuit parameters from the motor performance characteristics, which is normally available from the manufacturer data or from tests. Differential Evolution is not completely free from the problems of slow or premature convergence, that's why the idea of a much more efficient variant of DE comes. The variant of DE used for solving this problem utilize the concept of the neighborhood of each population member. The feasibility of the proposed method is demonstrated for two different motors and it is compared with the genetic algorithm and the Particle Swarm Optimization algorithm. From the simulation results it is evident that DEGL outperforms both the algorithms (GA and PSO) in the estimation of the parameters of the induction motor.

Giri, Ritwik; Chowdhury, Aritra; Ghosh, Arnob; Panigrahi, B. K.; Das, Swagatam

305

“DESIGN OF HIGH EFFICIENCY INDUSTRIAL INDUCTION MOTORS BY INNOVATIVE TECHNOLOGIES AND NEW MATERIALS” EXECUTIVE SUMMARY  

E-print Network

This project consists of the efficiency improvement in industrial three-phase induction motors, in the 0.75÷22 kW range, making use die cast copper rotor cages and most suitable magnetic materials (high permeability and/or low loss). The aim of the project is the analysis and the construction of several prototypes of induction motors by using the above mentioned innovative technological solutions, in order:- to define the design procedures and design strategies;- to verify the actual efficiency improvements;- to verify the arrangement of the motors respect to the European Classification Scheme (CEE-CEMEP) that foresees three efficiency classes EFF1, EFF2 and EFF3. Research description and results In this project three important Companies have been involved: • ThyssenKrupp Electrical Steel AST (Acciai Speciali Terni), European leader in the production of electrical steels for electromechanical applications. Acciai Speciali Terni has provided several electrical steels that have been used in the new prototypes. • LAFERT S.p.A., one of the most important Italian manufacturer of induction motors. LAFERT has provided the stator and rotor cores and stator windings and has assembled the prototypes with copper rotor cages. Moreover, LAFERT has co-operated in the construction of new stator and rotor figures and tests on the motors.

unknown authors

2003-01-01

306

A novel indicator of stator winding inter-turn fault in induction motor using infrared thermal imaging  

NASA Astrophysics Data System (ADS)

In this paper, a novel online and non-destructive algorithm is proposed to detect inter-turn short circuit faults in the stator windings of an induction motor. This fault detection algorithm is based on the features extracted from infrared images taken from the hottest region of the motor surface. Feature extraction method from infrared thermal images has been developed based on histogram of temperature profile, correlation between fault severity and the hottest region on the motor body, and comparison with healthy motor features. Experiments are conducted to demonstrate the effectiveness of the proposed method using a 2-hp induction motor.

Eftekhari, M.; Moallem, M.; Sadri, S.; Hsieh, Min-Fu

2013-11-01

307

Automatic frequency control of an induction furnace  

Microsoft Academic Search

Automatic frequency control enables a variable induction heating load to be driven at its resonant frequency, ensuring maximum power transfer to the load throughout the heating cycle. Analysis and experimental results of the resonance locked-loop are presented to illustrate the performance of the system

Irshad Khan; Jonathan Tapson; Ian de Vries

1999-01-01

308

3-D Eddy Current Analysis in a Silicon Steel Sheet of Squirrel-Cage Induction Motor  

NASA Astrophysics Data System (ADS)

Induction motors are widely used for electric instruments because of the toughness and the high reliability. It is necessary for the high efficiency design of motors to clarify the iron losses (the eddy current loss and the hysteresis loss) of the rotor and stator cores. It is difficult to clarify the iron loss by experiments. In this paper, the eddy current distribution in a silicon steel sheet of the squirrel-cage induction motor is analyzed by the 3-D finite element method to clarify the distribution of eddy current loss and hysteresis loss in the silicon steel sheet quantitatively. The validity of our method is clarified by comparing the calculated results and measured ones.

Kawase, Yoshihiro; Yamaguchi, Tadashi; Mizuno, Yasunari

309

Design and implementation of induction generator controller for single phase self excited induction generator  

Microsoft Academic Search

This paper presents design and implementation of Digital Signal Processor (DSP) based induction generator controller (IGC) to regulate the voltage and frequency of single phase self excited induction generator (SEIG) which employs a three phase squirrel cage induction machine, suitable for stand alone power mode employing unregulated turbine such as micro-hydro power generation. A three phase induction machine can be

D. K. Palwalia; S. P. Singh

2008-01-01

310

Increasing refiner production by using motor thermal capacity for protection and control  

SciTech Connect

Industrial motors are typically controlled and operated by closely monitoring the stator winding temperatures and limiting the phase currents within the motor manufacturer`s full-load ampacity rating. A different approach to motor operation and control was implemented at the Blue Ridge Lumber medium density fiberboard (MDF) plant at Whitecourt, Alta., Canada. The capacity control of the refiner is based on using the remaining thermal capacity of the motor as the primary control parameter. In this installation, a 4,000-hp totally enclosed water air cooled (TEWAC) squirrel-cage induction motor is continuously operating above the manufacturer`s rated full-load current, but is being controlled by maintaining thermal capacity at 50%. Temporary current loadings well above this are permitted for up to several minutes to accommodate variations in the wood feed stock to the refiner. This was implemented by installing a modern motor protection relay, communication with a programmable logic controller (PLC) system, and the development of operator interface displays to provide plant operators with the necessary information to monitor the motor parameters. Factors which needed to be considered were the electrical power system limitations, the motor cooling effectiveness, and mechanical limitations imposed by the refiner shaft design.

Grainger, L.G. [Grainger Electrical Research Ltd., Edmonton, Alberta (Canada)] [Grainger Electrical Research Ltd., Edmonton, Alberta (Canada); McDonald, M.C. [Alberta Energy Co., Calgary, Alberta (Canada)] [Alberta Energy Co., Calgary, Alberta (Canada)

1997-05-01

311

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

Microsoft Academic Search

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

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

1995-01-01

312

Microprocessor control system with rotor-flux estimator for PWM current source inverter feeding an induction machine  

Microsoft Academic Search

This paper presents simulation results of an induction motor-fed PWM current source inverter (CSI), control system. This system has an estimator whose principal function is to perform contemporary calculations of rotor flux magnitude and induction machine load angle. The assumption made was that the estimator would be realized with the aid of a 16-bit microprocessor. Machine rotor flux observation error

A. Dakir; R. Barlik; M. Nowalk; P. Grochal

1996-01-01

313

Robust controller design for a variable displacement hydraulic motor  

Microsoft Academic Search

Presents the robust control of a variable displacement hydraulic motor (VDHM). A feedback control structure consisting of two nested loops is employed. The inner feedback loop controls the position of the rocker arm which actuates the wobbler plate of the motor. The outer feedback loop regulates the motor shaft velocity such that shaft speed is guaranteed at steady state despite

Michael J. Plahuta; Matthew A. Franchek; Hansjoerg Stern

1998-01-01

314

Regenerative Braking Performance Analysis of a Thyristor-Chopper Controlled DC Series Motor  

Microsoft Academic Search

This paper presents a comprehensive analysis which predicts the performance of a thyristor-chopper controlled dc series motor during regenerative braking operation. The analysis takes into account all the possible modes of operation during this type of braking, the nonlinearity of the magnetization characteristics including the variation of the field inductance, and the effect of the commutating capacitor in the chopper

Sailendra N. Bhadra; Nisit K. De; Ajit K. Chattopadhyay

1981-01-01

315

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

316

Nonlinear dynamics in direct torque controlled induction machines analyzed by recurrence plots  

Microsoft Academic Search

The source of nonlinearity are the hysteresis comparators and dependence of switchings on state variables in direct torque controlled (DTC) induction machines (IM). The nonlinearity generates some strange operation states. They are revealed, analyzed by bifurcation diagram and recurrence plots both in motoring and generating operations.

Z. Suto; István Nagy; Eisuke Masada

2007-01-01

317

Artificial Intelligent Controller for a DC Motor  

NASA Astrophysics Data System (ADS)

The Speed and position control of DC motors is addressed in this paper. An optimal intelligent control scheme is proposed for the system. Preliminary a PID controller is designed using Genetic Algorithms (GA). The proposed controller is implemented by using optimal integral state feedback control with GA and Kalman filter. In the proposed scheme, performance depends on choosing weighting matrices Q and R in the cost function, and accordingly GA is used to find these proper weighting matrices. In order to reduce the control performance degradation due to system parameters variation, a Kalman filter is gained. The performance of the proposed technique (ISF) is compared with PID controller. Computer simulation validates the effectiveness of the proposed scheme even in presence of uncertainties.

Delavari, Hadi; Ranjbar Noiey, Abolzafl; Minagar, Sara

318

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

Meju, Max

319

Brushless motors and controllers designed for GM sunrayce  

Microsoft Academic Search

A new series of brushless motors and controllers have been designed and are being offered to the participants of the GM sponsored Sunrayce. The design, function, and application are discussed. Unique characteristics of the motors and controllers are explained. The author's company has been involved with drive systems for solar cars since 1987. They have developed a standard motor and

Cambier

1990-01-01

320

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.

321

Human Motor Computational Model Through Iterative Model Reference Adaptive Control  

E-print Network

Human Motor Computational Model Through Iterative Model Reference Adaptive Control Shou-Han Zhou observed in the human motor adaptation. Keywords: Human Motor Computational Model; Iterative Model.burdet@imperial.ac.uk). Abstract: A computational model using mechanical impedance control in combination with an iterative model

Melbourne, University of

322

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

NASA Astrophysics Data System (ADS)

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

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

323

Detection of a static eccentricity fault in a closed loop driven induction motor by using the angular domain order tracking analysis method  

NASA Astrophysics Data System (ADS)

In this study, a new method was presented for the detection of a static eccentricity fault in a closed loop operating induction motor driven by inverter. Contrary to the motors supplied by the line, if the speed and load, and therefore the amplitude and frequency, of the current constantly change then this also causes a continuous change in the location of fault harmonics in the frequency spectrum. Angular Domain Order Tracking analysis (AD-OT) is one of the most frequently used fault diagnosis methods in the monitoring of rotating machines and the analysis of dynamic vibration signals. In the presented experimental study, motor phase current and rotor speed were monitored at various speeds and load levels with a healthy and static eccentricity fault in the closed loop driven induction motor with vector control. The AD-OT method was applied to the motor current and the results were compared with the traditional FFT and Fourier Transform based Order Tracking (FT-OT) methods. The experimental results demonstrate that AD-OT method is more efficient than the FFT and FT-OT methods for fault diagnosis, especially while the motor is operating run-up and run-down. Also the AD-OT does not incur any additional cost for the user because in inverter driven systems, current and speed sensor coexist in the system. The main innovative parts of this study are that AD-OT method was implemented on the motor current signal for the first time.

Akar, Mehmet

2013-01-01

324

Adaptive Input–Output Feedback-Linearization-Based Torque Control of Synchronous Reluctance Motor Without Mechanical Sensor  

Microsoft Academic Search

In this paper, a well-known adaptive input-output feedback-linearization (AIOFL) technique is used for speed and torque-tracking control of synchronous reluctance motor drive. This controller is capable of estimating motor two-axis inductances (Ld, Lq) simultaneously. The overall stability of the proposed control and the persistency of excitation condition are proved based on Lyapunov theory. In addition, the maximum rate of change

Hossein Abootorabi Zarchi; Jafar Soltani; Gholamreza Arab Markadeh

2010-01-01

325

Spatial constancy mechanisms in motor control  

PubMed Central

The success of the human species in interacting with the environment depends on the ability to maintain spatial stability despite the continuous changes in sensory and motor inputs owing to movements of eyes, head and body. In this paper, I will review recent advances in the understanding of how the brain deals with the dynamic flow of sensory and motor information in order to maintain spatial constancy of movement goals. The first part summarizes studies in the saccadic system, showing that spatial constancy is governed by a dynamic feed-forward process, by gaze-centred remapping of target representations in anticipation of and across eye movements. The subsequent sections relate to other oculomotor behaviour, such as eye–head gaze shifts, smooth pursuit and vergence eye movements, and their implications for feed-forward mechanisms for spatial constancy. Work that studied the geometric complexities in spatial constancy and saccadic guidance across head and body movements, distinguishing between self-generated and passively induced motion, indicates that both feed-forward and sensory feedback processing play a role in spatial updating of movement goals. The paper ends with a discussion of the behavioural mechanisms of spatial constancy for arm motor control and their physiological implications for the brain. Taken together, the emerging picture is that the brain computes an evolving representation of three-dimensional action space, whose internal metric is updated in a nonlinear way, by optimally integrating noisy and ambiguous afferent and efferent signals. PMID:21242137

Medendorp, W. Pieter

2011-01-01

326

Traction control device of a motor vehicle  

SciTech Connect

A traction control device is described for a motor vehicle having a plurality of wheels including at least one drive wheel, and an internal combustion engine having an intake passage and connected to the driven wheel for driving the driven wheel, the device comprising: a manually operated throttle valve adapted to be coupled in the intake passage; detecting means adapted for detecting a speed of rotation of the driven wheel and providing an output signal corresponding thereto; a flow control valve adapted to be coupled in the intake passage in series with the manually operated throttle valve; drive means for driving the flow control valve; and electronic control means, coupled to the detecting means and the drive means.

Nakamura, K.; Kobayashi, I.; Nogami, T.; Shirai, A.; Nomura, Y.; Ohashi, K.

1987-01-20

327

Harmonic Torque and Speed Pulsations in a Rectifier-Inverter Induction Motor Drive  

Microsoft Academic Search

A method of predicting the 6th-harmonic electromagnetic torque of an induction motor arising from a rectifier-inverter power source is presented. This study includes both the effects of harmonic variation rotor speed and inverter voltage. Although only the 6th harmonic is considered, it is shown that this is sufficiently accurate to predict steady-state system performance for practical speed ranges and system

Thomas Lipo; Paul Krause; Howard Jordan

1969-01-01

328

Two-Pole induction-motor vibrations caused by homopolar alternating fluxes  

Microsoft Academic Search

Homopolar alternating fluxes of slip frequency will arise in a three-phase two-pole induction motor with a flexible shaft if the rotor is eccentrically placed in the stator bore. It is in fact the resulting eccentric air gap that creates the homopolar fluxes: these excite mechanical forces of double slip frequency, superposed on the double-frequency vibrations and on the force waves

K. P. Kovacs

1977-01-01

329

Diagnostics of an induction-motor rotor by the spectral analysis of stator currents  

NASA Astrophysics Data System (ADS)

A method for achieving more efficient revealing and more unambiguous evaluation of various kinds of defects in the induction-motor (IM) rotor, which is based on changes occurring in the characteristic signs of the spectrum of the stator current, is presented. The results and analysis of measurements performed for artificially specified cases of faults in the rotor of a small-capacity IM are presented.

Weinreb, K.

2013-12-01

330

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

331

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

332

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

333

Proprioception and Motor Control in Parkinson's Disease  

Microsoft Academic Search

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

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

2009-01-01

334

Efficiency increment of 0.5hp induction motor by using different thickness of rotor lamination steel sheet via FEM  

Microsoft Academic Search

In this paper, the three phase AC induction motor have been thoroughly investigated and analyzed in terms of the induction motor parameter, efficiency and loss segregation. Through out this project, a new rotor which has 0.35mm lamination steel sheet and 10mm rotor bar size is fabricated and compared with the existing rotor which has 0.50mm and 10mm rotor bar size.

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

2011-01-01

335

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

NASA Astrophysics Data System (ADS)

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

Kaga, Akio; Anazawa, Yoshihisa; Tajima, Katsubumi

1991-07-01

336

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

337

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

338

Motor control & performance with aging Today: Examine motor abilities with  

E-print Network

for the heart, more mass to move! ­ bone density decreases · females: 30% by age 70, males 15% Neuromotor ­still see anticipatory grip force based on previous weight force rate adapt later to new load #12 to as `psychomotor slowing' ­ 15% decrease in conduction velocity ­ decrease max discharge rate of motor neurons

Sergio, Lauren E.

339

A critical evaluation of the force control hypothesis in motor control  

Microsoft Academic Search

The ability to formulate explicit mathematical models of motor systems has played a central role in recent progress in motor control research. As a result of these modeling efforts and in particular the incorporation of concepts drawn from control systems theory, ideas about motor control have changed substantially. There is growing emphasis on motor learning and particularly on predictive or

David J. Ostry; Anatol G. Feldman

2003-01-01

340

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

341

Rotor Cage Fault Diagnostics in Three-Phase Induction Motors, by the Instantaneous Non-Active Power Signature Analysis  

Microsoft Academic Search

In this paper a new detection technique based on the instantaneous non-active power signature analysis is proposed for the diagnosis of rotor cage faults in operating three-phase induction motors. For that purpose, a mathematical model based on the winding function approach is used in order to simulate this type of fault and experimental tests are carried out on an induction

M. Drif; A. J. MarquesCardoso

2007-01-01

342

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 to perform a delay center-out reaching task controlling a computer cursor under natural arm movement (manual-011-0369-1 #12;natural arm movement. These results indicate that ensembles most associated to movement contain

Pillow, Jonathan

343

Analysis of induction motor operated with raised sine ware power supply  

Microsoft Academic Search

Frequency Carrier gathers momentum with the utilization of high speed power switches such as power MosFETs and IGBTs and software based control using micro controllers and digital processors. This technological development paves way for development of an algorithm for PWM control of solid state inverter based motor drive, to generate raised sine wave (RSW) supply. This novel approach of operating

M. S. Balakrishnan; R. Theagarajan

2011-01-01

344

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

345

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 MCCâs 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.

346

A new diagnosis of broken rotor bar fault extent in three phase squirrel cage induction motor  

NASA Astrophysics Data System (ADS)

This paper proposes a new induction motor broken bar fault extent diagnostic approach under varying load conditions based on wavelet coefficients of stator current in a specific frequency band. In this paper, winding function approach (WFA) is used to develop a mathematical model to provide indication references for parameters under different load levels and different fault cases. It is shown that rise of number of broken bars and load levels increases amplitude of the particular side band components of the stator currents in faulty case. Stator current, rotor speed and torque are used to demonstrate the relationship between these parameters and broken rotor bar severity. An induction motor with 1, 2 and 3 broken bars and the motor with 3 broken bars in experiment at no-load, 50% and 100% load are investigated. A novel criterion is then developed to assess rotor fault severity based on the stator current and the rotor speed. Simulations and experimental results confirm the validity of the proposed approach.

Shi, Pu; Chen, Zheng; Vagapov, Yuriy; Zouaoui, Zoubir

2014-01-01

347

Induction factor optimization through variable lift control  

NASA Astrophysics Data System (ADS)

Due to practical design limitations coupled with the detrimental effects posed by complex wind regimes, modern wind turbines struggle to maintain or even reach ideal operational states. With additional gains through traditional approaches becoming more difficult and costly, active lift control represents a more attractive option for future designs. Here, plasma actuators have been explored experimentally in trailing edge applications for use in attached flow regimes. This authority would be used to drive the axial induction factor toward the ideal given by the Betz limit through distributed lift control thereby enhancing energy capture. Predictions of power improvement achievable by this methodology are made with blade - element momentum theory but will eventually be demonstrated in the field at the Laboratory for Enhanced Wind Energy Design, currently under construction at the University of Notre Dame.

Cooney, John; Corke, Thomas; Nelson, Robert; Williams, Theodore

2011-11-01

348

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

349

Motor control of Drosophila courtship song  

PubMed Central

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

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

2014-01-01

350

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

351

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

NASA Astrophysics Data System (ADS)

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.

1984-02-01

352

EE443L Lab 4: Open Versus Closed Loop Motor Speed Control Continued Closed Loop Motor Speed Control  

E-print Network

and Altera generates the corresponding duty cycle. b) The main loop is now hardware timed via the analogEE443L Lab 4: Open Versus Closed Loop Motor Speed Control Continued Closed Loop Motor Speed Control an Altera PLD. Three major changes to the VI structure have been made to increase and control loop

Wedeward, Kevin

353

Identification of significant intrinsic mode functions for the diagnosis of induction motor fault.  

PubMed

For the analysis of non-stationary signals generated by a non-linear process like fault of an induction motor, empirical mode decomposition (EMD) is the best choice as it decomposes the signal into its natural oscillatory modes known as intrinsic mode functions (IMFs). However, some of these oscillatory modes obtained from a fault signal are not significant as they do not bear any fault signature and can cause misclassification of the fault instance. To solve this issue, a novel IMF selection algorithm is proposed in this work. PMID:25096149

Cho, Sangjin; Shahriar, Md Rifat; Chong, Uipil

2014-08-01

354

Methods for Improving Efficiency of Linear Induction Motor for Urban Transit  

NASA Astrophysics Data System (ADS)

To improve the efficiency of the linear induction motors (LIMs) for transportation, the compensation of end effect for LIM with the restriction of length and the long LIM with small end effect essentially are discussed respectively. Based on the proposed concept, the compensation method of the magnet rotator type and AC coil type of compensators are developed respectively. The utility is not yet confirmed. As for the long LIM with length of 10m, the analysis shows that the efficiencies are about 85% at 40km/h and above 90% at 360km/h respectively.

Fujii, Nobuo; Hoshi, Toshiyuki; Tanabe, Yuichi

355

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

356

A Digital Method for DC Motor Speed Control  

Microsoft Academic Search

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

Timothy J. Maloney; Fernando L. Alvarado

1976-01-01

357

Multiple paired forward and inverse models for motor control  

Microsoft Academic Search

Humans demonstrate a remarkable ability to generate accurate and appropriate motor behavior under many different and often uncertain environmental conditions. In this paper, we propose a modular approach to such motor learning and control. We review the behavioral evidence and benefits of modularity, and propose a new architecture based on multiple pairs of inverse (controller) and forward (predictor) models. Within

Daniel M. Wolpert; Mitsuo Kawato

1998-01-01

358

Controlling An Inverter-Driven Three-Phase Motor  

NASA Technical Reports Server (NTRS)

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

Dolland, C.

1984-01-01

359

A COMPUTATIONAL APPROACH TO HUMAN ADAPTIVE MOTOR CONTROL  

E-print Network

A COMPUTATIONAL APPROACH TO HUMAN ADAPTIVE MOTOR CONTROL Nikhil Bhushan Dept. of Biomedical in Engineering August 25, 1998 #12;Abstract The aim of this thesis is to understand the computational process that underlie adaptive motor control capabilities of humans based on the study of reaching movements of the arm

Shadmehr, Reza

360

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

361

Novel diagnosis technique of mass unbalance in rotor of induction motor by the analysis of motor starting current at no load through wavelet transform  

Microsoft Academic Search

This paper presents an improved technique for detection of mass unbalance in rotor of an induction motor by the analysis of transient stator current during starting period using both discrete wavelet transform (DWT) and continuous wavelet transform(CWT). The unbalanced magnetic pull due to centrifugal force developed for mass unbalance in rotor produces excessive vibration in the rotor as well as

S. K. Ahamed; Subrata Karmakar; M. Mitra; S. Sengupta

2010-01-01

362

Estimation of the running speed and bearing defect frequencies of an induction motor from vibration data  

NASA Astrophysics Data System (ADS)

This paper presents two separate algorithms for estimating the running speed and the bearing key frequencies of an induction motor using vibration data. Bearing key frequencies are frequencies at which roller elements pass over a defect point. Most frequency domain-based bearing fault detection and diagnosis techniques (e.g. envelope analysis) rely on vibration measurements and the bearing key frequencies. Thus, estimation of the running speed and the bearing key frequencies are required for failure detection and diagnosis. The paper also incorporates the estimation algorithms with the most commonly used bearing fault detection technique, high-frequency demodulation, to detect bearing faults. Experimental data were used to verify the validity of the algorithms. Data were collected through an accelerometer measuring the vibration from the drive-end ball bearing of an induction motor (Reliance Electric 2HP IQPreAlert)-driven mechanical system. Both inner and outer race defects were artificially introduced to the bearing using electrical discharge machining. A linear vibration model was also developed for generating simulated vibration data. The simulated data were also used to validate the performance of the algorithms. The test results proved the algorithms to be very reliable.

Ocak, Hasan; Loparo, Kenneth A.

2004-05-01

363

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

364

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

365

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

366

Directed Induction of Functional Motor Neuron-Like Cells from Genetically Engineered Human Mesenchymal Stem Cells  

PubMed Central

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

367

Development and fundamental study on a superconducting induction\\/synchronous motor incorporated with MgB2 cage windings  

Microsoft Academic Search

In this paper, a fundamental study of the rotating characteristics of a induction\\/synchronous motor by use of superconducting MgB2 cage windings is carried out based on analysis and experiment. Current transport properties of the produced monofilamentary MgB2 wires are firstly characterized, and then utilized for the determination of the current carrying capacity of the rotor bars. Then, the motor model

T Nakamura; Y Yamada; H Nishio; K Kajikawa; M Sugano; N Amemiya; T Wakuda; M Takahashi; M Okada

2012-01-01

368

A novel robust speed controller scheme for PMBLDC motor.  

PubMed

The design of speed and position controllers for permanent magnet brushless DC motor (PMBLDC) drive remains as an open problem in the field of motor drives. A precise speed control of PMBLDC motor is complex due to nonlinear coupling between winding currents and rotor speed. In addition, the nonlinearity present in the developed torque due to magnetic saturation of the rotor further complicates this issue. This paper presents a novel control scheme to the conventional PMBLDC motor drive, which aims at improving the robustness by complete decoupling of the design besides minimizing the mutual influence among the speed and current control loops. The interesting feature of this robust control scheme is its suitability for both static and dynamic aspects. The effectiveness of the proposed robust speed control scheme is verified through simulations. PMID:17544426

Thirusakthimurugan, P; Dananjayan, P

2007-10-01

369

Distributed control of hybrid motor drives  

Microsoft Academic Search

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

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

2005-01-01

370

Motor neurons controlling fluid ingestion in Drosophila  

PubMed Central

Rhythmic motor behaviors such as feeding are driven by neural networks that can be modulated by external stimuli and internal states. In Drosophila, ingestion is accomplished by a pump that draws fluid into the esophagus. Here we examine how pumping is regulated and characterize motor neurons innervating the pump. Frequency of pumping is not affected by sucrose concentration or hunger but is altered by fluid viscosity. Inactivating motor neurons disrupts pumping and ingestion, whereas activating them elicits arrhythmic pumping. These motor neurons respond to taste stimuli and show prolonged activity to palatable substances. This work describes an important component of the neural circuit for feeding in Drosophila and is a step toward understanding the rhythmic activity producing ingestion. PMID:22474379

Manzo, Andrea; Silies, Marion; Gohl, Daryl M.; Scott, Kristin

2012-01-01

371

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 ...

372

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

373

Aging and Concurrent Task Performance: Cognitive Demand and Motor Control  

ERIC Educational Resources Information Center

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

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

2006-01-01

374

Optimal feedback control as a theory of motor coordination  

Microsoft Academic Search

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

Michael I. Jordan

2002-01-01

375

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

376

Hierarchical control of motor units in voluntary contractions.  

PubMed

For the past five decades there has been wide acceptance of a relationship between the firing rate of motor units and the afterhyperpolarization of motoneurons. It has been promulgated that the higher-threshold, larger-soma, motoneurons fire faster than the lower-threshold, smaller-soma, motor units. This relationship was based on studies on anesthetized cats with electrically stimulated motoneurons. We questioned its applicability to motor unit control during voluntary contractions in humans. We found that during linearly force-increasing contractions, firing rates increased as exponential functions. At any time and force level, including at recruitment, the firing rate values were inversely related to the recruitment threshold of the motor unit. The time constants of the exponential functions were directly related to the recruitment threshold. From the Henneman size principle it follows that the characteristics of the firing rates are also related to the size of the soma. The "firing rate spectrum" presents a beautifully simple control scheme in which, at any given time or force, the firing rate value of earlier-recruited motor units is greater than that of later-recruited motor units. This hierarchical control scheme describes a mechanism that provides an effective economy of force generation for the earlier-recruited lower force-twitch motor units, and reduces the fatigue of later-recruited higher force-twitch motor units-both characteristics being well suited for generating and sustaining force during the fight-or-flight response. PMID:21975447

De Luca, Carlo J; Contessa, Paola

2012-01-01

377

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

378

New advanced control methods for doubly salient permanent magnet motor  

SciTech Connect

High performance and high efficiency in adjustable speed drives are needed and new motor constructions are world wide investigated and analyzed. This paper deals with advanced control of a recently developed Doubly Salient Permanent Magnet (DSPM) motor. The construction of the DSPM motor is shown and a dynamical model of the motor is used for simulations. As supply to the DSPM motor, a power converter with a split capacitor is used to reduce the number of devices, and a basic control method for this converter is explained. This control method will cause an unequal voltage distribution across the capacitors because the motor is asymmetrical and a decrease in efficiency and a poorer dynamic performance are the results. To minimize the problems with the unequal load of the capacitors in the converter, a new charge control strategy is developed. The efficiency of the motor can also be improved by using a power minimizing scheme based on changing the turn-on and turn-off angles of the current. The two different strategies are implemented in an adjustable-speed drive, and it is concluded that both control strategies improve the performance of the drive.

Blaabjerg, F.; Christensen, L.; Rasmussen, P.O.; Oestergaard, L.; Pedersen, P. [Aalborg Univ. (Denmark)

1995-12-31

379

Evolution of Motor Control: From Reflexes and Motor Programs to the Equilibrium-Point Hypothesis  

PubMed Central

This brief review analyzes the evolution of motor control theories along two lines that emphasize active (motor programs) and reactive (reflexes) features of voluntary movements. It suggests that the only contemporary hypothesis that integrates both approaches in a fruitful way is the equilibrium-point hypothesis. Physical, physiological, and behavioral foundations of the EP-hypothesis are considered as well as relations between the EP-hypothesis and the recent developments of the notion of motor synergies. The paper ends with a brief review of the criticisms of the EP-hypothesis and challenges that the hypothesis faces at this time. PMID:19823595

Latash, Mark L.

2009-01-01

380

Power factor controllers  

SciTech Connect

The power factor controller (PFC) is a solid state electronic device that reduces excessive energy waste in ac induction motors. The significance of the PFC lies in the fact that nearly a billion induction motors are used daily. The PFC is applicable to both single phase and three phase induction motors. Since it is connected to the power lines of the motor and requires no modification to the motor itself, it may be applied to existing motors as well as to new installations.

Not Available

1982-01-01

381

A variable speed constant voltage controller for self-excited induction generator with minimum control requirements  

Microsoft Academic Search

The paper deals with a variable speed, constant voltage controller for induction generator operating in self excited mode. A new PWM controller is proposed to regulate the induction generator terminal voltage. The proposed controller regulates three-phase AC output voltage of the self-excited induction generator with varying rotor speed, transient load conditions and reactive loads. The proposed scheme does not require

Shashank Wekhande; Vivek Agarwal

1999-01-01

382

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

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

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

383

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

384

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

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

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

385

6. VIEW, LOOKING SOUTH OF OPERATOR DECK, SHOWING MOTOR CONTROLS ...  

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

6. VIEW, LOOKING SOUTH OF OPERATOR DECK, SHOWING MOTOR CONTROLS AND LEVERS AND HOIST FOR TRASH RAKE - Cabot Station Electric Generating Plant, Gantry Crane, Montague City Road, Turners Falls vicinity, Montague, Franklin County, MA

386

Precise Assessment of Performance of Induction Motor under Supply Imbalance Through Impedance Unbalance Factor  

NASA Astrophysics Data System (ADS)

This paper presents precise assessment of steady-state performance of induction motor (IM) operating under voltage unbalance. The variation of two voltage unbalance factors viz. complex voltage unbalance factor (CVUF) and impedance unbalance factor (IUF) with positive sequence voltage component, reveals that degree and manner of unbalance in supply voltage is exactly reflected in CVUF and IUF, respectively. On this basis, it is shown that for the precise assessment of IM performance, knowledge of both, manner (IUF) and degree (CVUF) of unbalance is important. Further, effect of angle of unbalance, on the performance of the IM and voltage pattern is analyzed. Results depict high sensitivity of derating factor and peak copper losses to this angle. Thus, it should be included along with unbalance factors for the precise and complete performance assessment of IM.

Singh, Shashi Bhushan; Singh, Asheesh Kumar

2013-01-01

387

Intelligent step motor control unit for continuous tracking  

NASA Astrophysics Data System (ADS)

The microprocessor-based step-motor-control unit developed to provide automated continuous satellite tracking for the azimuth-mounted laser-ranging instruments of the Intercosmos station at Helwan, Egypt, is described. The control is self-contained and based on the 8080 CPU, and operates both of the step motors at maximum speed 1.2 turns/s (at 800 steps/turn). Provision is made for small operator corrections to the instrument pointing during the tracking process.

Cech, M.

388

The application of modern signal processing techniques to rotor fault detection and location within three phase induction motors  

Microsoft Academic Search

Previous work at The Robert Gordon University has shown that faults within the rotors of large three phase induction motors, such as broken rotor bars, can be detected by monitoring and analysing the line current taken by the machine during a no-load starting transient. This line current has been shown to contain frequency components which are indicative of these fault

R. Burnett; J. F. Watson; S. Elder

1995-01-01

389

Dynamic Characteristics of a Linear Induction Motor for Predicting Operating Performance of Magnetic Levitation Vehicles Based on Electromagnetic Field Theory  

Microsoft Academic Search

This paper deals with the dynamic characteristics of a linear induction motor (LIM) in terms of acceleration times and jerk conditions. We employed Matlab Simulink for conducting simulations of the dynamic modeling of LIM operated by a space vector pulse width modulation inverter. From the simulation results, the maximum load conditions and minimum acceleration times to guarantee passengers’ safety were

Seok-Myeong Jang; Yu-Seop Park; So-Young Sung; Kyoung-Bok Lee; Han-Wook Cho; Dae-Joon You

2011-01-01

390

Cause and analysis of stator and rotor failures in three-phase squirrel-cage induction motors  

Microsoft Academic Search

The squirrel cage induction motor has limitations, which, if exceeded, will result in premature failure of the stator or rotor. The authors identify the various causes of stator and rotor failures. A specific methodology is proposed to facilitate an accurate analysis of these failures. Failures of the bearings and lubrication systems are excluded

Austin H. Bonnett; George C. Soukup

1992-01-01

391

Effects of Low Frequencies on Three Phase Induction Motor Performance Operating in Close Proximity to Rated Speed  

Microsoft Academic Search

Variable speed drives (VSD) are adhered to induction motors in most of the present industrial applications. And since the world has become more conscientious to energy saving, inverters established them selves in domestic buildings and industry. Square wave inverters generate dominant harmonics of the 5th, 7th, 11 th and 13 th order. Inverters based on PWM strategy produce much higher

Qazem Jaber; Qais Naman; Mahdi Shamaseen

2007-01-01

392

Condition monitoring of induction motors using combined PSD based wavelet decomposition and selective weighting using spider web plots  

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. E.g.: A monstrous three-phase AC induction motor to drive a city water

S. Jeevanand; Abraham T. Mathew

2008-01-01

393

Bearing failure diagnosis in three-phase induction motor by chirp-Z transform and zoom-MUSIC  

Microsoft Academic Search

This paper introduces a new approach of the stator current spectral analysis, based on chirp-Z transform (CZT) and Zoom Multiple signal classification (ZMUSIC), for diagnosing the occurrence of bearing faults in three-phase induction motor. In contrast with traditional FFT, CZT and ZMUSIC are suitable when it is necessary to analyze a not stationary signal such as the current signal of

Xiangjun Wang; Fang Fang

2011-01-01

394

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

Microsoft Academic Search

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

Robert J. Brozek; James J. Bonner

1971-01-01

395

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

396

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

397

40 CFR 80.24 - Controls applicable to motor vehicle manufacturers.  

...false Controls applicable to motor vehicle manufacturers. 80.24 Section...24 Controls applicable to motor vehicle manufacturers. (a) [Reserved] (b) The manufacturer of any motor vehicle equipped with an...

2014-07-01

398

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

399

Compliance control of circular traveling wave motor  

Microsoft Academic Search

Traveling wave ultrasonic motors (TWUSMs) were used as actuators for a prosthetic arm, because of their light weight, compact size, silent motion, high-speed response, and low-speed rotation. The prosthetic arm has to move in compliance with the environmental force around every joint, as in the human arm. In order to realize a compliant prosthetic arm, it is desired that the

Atsuo Kato; Koji Ito; M. Ito

1991-01-01

400

Modular features of motor control and learning  

Microsoft Academic Search

The study of complex motor behaviours has highlighted the role of modular representations both in the planning and in the execution of actions. Recent findings suggest the presence of functional modules within a variety of neural structures. Computational investigations are now addressing the issue of how these modules may act concurrently to generate a wide repertoire of behaviours.

Ferdinando A. Mussa-Ivaldi

1999-01-01

401

Feature Extraction using Wavelet Transform for Multi-class Fault Detection of Induction Motor  

NASA Astrophysics Data System (ADS)

In this paper the theoretical aspects and feature extraction capabilities of continuous wavelet transform (CWT) and discrete wavelet transform (DWT) are experimentally verified from the point of view of fault diagnosis of induction motors. Vertical frame vibration signal is analyzed to develop a wavelet based multi-class fault detection scheme. The redundant and high dimensionality information of CWT makes it computationally in-efficient. Using greedy-search feature selection technique (Greedy-CWT) the redundancy is eliminated to a great extent and found much superior to the widely used DWT technique, even in presence of high level of noise. The results are verified using MLP, SVM, RBF classifiers. The feature selection technique has enabled determination of the most relevant CWT scales and corresponding coefficients. Thus, the inherent limitations of CWT like proper selection of scales and redundant information are eliminated. In the present investigation `db8' is found as the best mother wavelet, due to its long period and higher number of vanishing moments, for detection of motor faults.

Chattopadhyay, P.; Konar, P.

2014-01-01

402

Motor Learning and Control Foundations of Kinesiology: Defining the Academic Core  

ERIC Educational Resources Information Center

This paper outlines the kinesiological foundations of the motor behavior subdisciplines of motor learning and motor control. After defining the components of motor behavior, the paper addresses the undergraduate major and core knowledge by examining several classic textbooks in motor learning and control, as well as a number of contemporary…

Fischman, Mark G.

2007-01-01

403

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.

404

Control of flexible structure using back electromotive force of motor  

Microsoft Academic Search

Wave absorbing control for vibration suppression of flexible space structure is studied. In order to implement control method in a realistic system, it is usually necessary that the signals obtained from sensors are led to actuators through the process of the digital computer programmed under the control law. In this study, a torque motor is used not only as the

Khoichi Matsuda; Shinji Hatano; Hironori Fujii

1992-01-01

405

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

406

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

407

Electrophysiology of motor pathways for sphincter control in multiple sclerosis.  

PubMed Central

The central and peripheral motor pathways serving striated sphincter muscle function were studied using cortical and lumbar transcutaneous electrical stimulation, pudendal nerve stimulation and sphincter electromyography in 23 patients with multiple sclerosis (MS), and sphincter disturbance, including incontinence of urine or faeces, urinary voiding dysfunction, or constipation. The central motor conduction time was significantly increased in the MS group compared to controls (p less than 0.05). Damage to both the upper and lower motor neuron pathways can contribute to sphincter disturbance in MS. The latter may be due to coexisting pathology or to involvement of the conus medullaris by MS. PMID:2178181

Mathers, S E; Ingram, D A; Swash, M

1990-01-01

408

Electrophysiology of motor pathways for sphincter control in multiple sclerosis.  

PubMed

The central and peripheral motor pathways serving striated sphincter muscle function were studied using cortical and lumbar transcutaneous electrical stimulation, pudendal nerve stimulation and sphincter electromyography in 23 patients with multiple sclerosis (MS), and sphincter disturbance, including incontinence of urine or faeces, urinary voiding dysfunction, or constipation. The central motor conduction time was significantly increased in the MS group compared to controls (p less than 0.05). Damage to both the upper and lower motor neuron pathways can contribute to sphincter disturbance in MS. The latter may be due to coexisting pathology or to involvement of the conus medullaris by MS. PMID:2178181

Mathers, S E; Ingram, D A; Swash, M

1990-11-01

409

Optimal feedback control and the neural basis of volitional motor control  

Microsoft Academic Search

Skilled motor behaviour, from the graceful leap of a ballerina to a precise pitch by a baseball player, appears effortless but reflects an intimate interaction between the complex mechanical properties of the body and control by a highly distributed circuit in the CNS. An important challenge for understanding motor function is to connect these three levels of the motor system

Stephen H. Scott

2004-01-01

410

Development and fundamental study on a superconducting induction/synchronous motor incorporated with MgB2 cage windings  

NASA Astrophysics Data System (ADS)

In this paper, a fundamental study of the rotating characteristics of a induction/synchronous motor by use of superconducting MgB2 cage windings is carried out based on analysis and experiment. Current transport properties of the produced monofilamentary MgB2 wires are firstly characterized, and then utilized for the determination of the current carrying capacity of the rotor bars. Then, the motor model is designed and fabricated with the aid of conventional (copper) stator windings. We successfully observe the synchronous rotation of the fabricated motor at a rotation speed range from 300 to 1800 rpm. We can also realize an almost constant torque versus speed curve, and this characteristic is explained from the steep take-off of the electric field versus the current density curve, based on the nonlinear electrical equivalent circuit. These results are promising for the practical applications of a high efficiency motor for a liquid hydrogen circulation pump.

Nakamura, T.; Yamada, Y.; Nishio, H.; Kajikawa, K.; Sugano, M.; Amemiya, N.; Wakuda, T.; Takahashi, M.; Okada, M.

2012-01-01

411

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

412

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

413

Hybrid Pwm Switching Strategy for a Three-Level Inverter Fed Induction Motor Drive with Open-End Windings  

NASA Astrophysics Data System (ADS)

A dual two-level inverter fed induction motor with open-end windings is capable of generating a three-level output voltage. Several, sine-triangle and space vector pulse width modulation (PWM) switching strategies are presented for the dual-inverter scheme either using space-vector or carrier-based implementation. In this paper, a hybrid PWM switching strategy for the dual-inverter scheme is proposed employing sine-triangle PWM (SPWM) and space vector PWM (SVPWM) for the individual inverters. SPWM is theoretically analyzed and space vector based implementation of SPWM is presented using a simple offset-time concept. This is exploited to implement the hybrid PWM switching strategy for the dual two-level inverter. The implementation of the hybrid PWM switching strategy proposed in this paper do not require any look-up tables, the switching is totally automatic obviating the time-consuming task of sector identification. The implementation of the hybrid PWM scheme requires only the three instantaneous phase reference voltages corresponding to the reference space vector. The third harmonic component in the voltage appearing across the motor phase windings in the induction motor is significantly reduced (by 50%) with the use of the proposed hybrid PWM scheme as compared to the use of the PWM scheme presented earlier. Also, the percentage weighted total harmonic distortion (%WTHD) of the output voltage is significantly reduced in the entire range of speed of the induction motor driven by the dual-inverter scheme.

Srinivas, S.; Ramachandrasekhar, K.

2010-06-01

414

Hardware Evolution of Analog Speed Controllers for a DC Motor  

NASA Technical Reports Server (NTRS)

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

Gwaltney, David A.; Ferguson, Michael I.

2003-01-01

415

Adaptive Fuzzy Control of a Direct Drive Motor: Experimental Aspects  

NASA Technical Reports Server (NTRS)

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

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

1998-01-01

416

Adaptive Fuzzy Control of a Direct Drive Motor  

NASA Technical Reports Server (NTRS)

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

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

1997-01-01

417

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

418

Closed loop power control of an induction furnace  

Microsoft Academic Search

In this paper, at first, an optimized resonant capacitor is designed for a practical induction furnace with parallel resonant inverter, by using Lagrange's method. Then, rectifier and inverter snubber circuits are designed. To access a control system, a passive linear controller is also designed. Meanwhile the whole system is started and load is changing, the controller, by changing firing angle

Arash Kiyoumarsi; Rahmat-o-Allah Houshmand; Rasoul Ali-Zargar; Mohammad-reza Hassanzadeh

2008-01-01

419

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

420

Brushless DC motor control using a general regression neural network  

Microsoft Academic Search

A general regression neural network (GRNN) is used to simulate the speed control of a brushless DC motor. The GRNN offers advantages over conventional controllers in terms of adaptability, robustness to parameter variation, and simplicity. Because of its capability to learn quickly, the GRNN is particularly suited to online learning of changing plant conditions

James B. Patton

1995-01-01

421

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

422

Instantaneous Power Control of Induction Machines  

Microsoft Academic Search

This paper presents a new algorithm for the control of AC machines based on the concept of controlling the instantaneous real and imaginary power. This strategy, called Instantaneous Power Control (IPC), allows decoupled control of the torque and flux in the machine. This paper outlines the basic algorithm and then presents simulation results of its performance.

R. E. Betz; B. J. Cook

423

Active Fault Tolerant Control for Ultrasonic Piezoelectric Motor  

NASA Astrophysics Data System (ADS)

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

Boukhnifer, Moussa

2012-07-01

424

Control of a wind-driven self-excited induction generator water-pumping system for maximum utilization efficiency  

SciTech Connect

This paper analyzes a stand-alone water-pumping system consisting of a motor-pump set supplied by a wind-driven self-excited induction generator. In order to achieve maximum utilization efficiency, the system designer is interested in optimally matching the system components together so that maximum energy available from the wind is absorbed and utilized all the time. Unfortunately, this optimal matching is speed-dependent and hence no single matching is valid for all wind speeds. Therefore the operating point of the system must vary with wind speed. In this paper, a control strategy is formulated which properly adjust the operating point of the system to coincide with the maximum power operating condition. The self-excited induction generator (SEIG) is basically an induction machine which is driven by a prime mover such as a wind turbine while a capacitor is connected across its stator terminals. The SEIG supplies an induction motor which is coupled to a water pump. The system need not operate continuously and water can be used directly for drinking and irrigation or it can be collected in a storage tank for later use. Due to the high cost of the wind turbine and equipment, the system designer is interested in maximizing the amount of pumped water per day. This can be achieved by proper selection and matching of the system components. However, proper matching of the system components together is not sufficient to guarantee maximum utilization since matching is dependent on wind speed. Therefore, certain system components must be controlled according to wind speed, such that matching is achieved all the time. This paper presents a control strategy to control the excitation capacitance of the induction generator such that its generated terminal voltage, which is applied to the induction motor, is kept constant as the rotor speed varies with wind speed.

Alghuwainem, S.M.

1998-07-01

425

Estimation of Control Parameters of Self-Excited Induction Generator  

Microsoft Academic Search

Operation of induction generator in self-excited mode is found to be useful in contrast to grid connected mode due to its ability to generate power for wide range of operating speeds. However such operations results in to a frequent variations in terminal voltage and frequency in the absence of any control strategy. Therefore such machines need a proper control to

K S Sandhu; Dheeraj Joshi

2009-01-01

426

Direct torque control of induction machines using space vector modulation  

Microsoft Academic Search

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

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

1992-01-01

427

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

428

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

429

Performance analysis of a PV powered dc motor driving a 3-phase self-excited induction generator  

SciTech Connect

Photovoltaic (PV) powered dc motors driving dedicated loads (e.g. water pumps) are increasingly used in the remote rural areas of many developing countries. The key to their success is simplicity (direct coupling, no dc-ac inversion, no storage batteries, etc.). In this paper a PV powered dc motor is used to drive an isolated three-phase self-excited induction generator (SEIG). It is found that due to the unique torque-speed characteristics of the SEIG, utilization efficiency is close to maximum at all insolation levels with no peak-power tracking. The proposed arrangement is useful as part of an integrated renewable energy system (IRES), which takes advantage of the inherent diversity of wind and insolation in most developing countries to improve power quality. The SEIG is driven by wind turbine, dc motor, or both. Performance of the system under different insolation conditions is analyzed.

Alghuwainem, S.M. [King Saud Univ., Riyadh (Saudi Arabia)] [King Saud Univ., Riyadh (Saudi Arabia)

1996-03-01

430

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

431

Detection and Isolation of Speed, DC-Link Voltage, and Current-Sensor Faults Based on an Adaptive Observer in Induction-Motor Drives  

Microsoft Academic Search

A sensor fault detection and isolation unit is consid- ered for induction-motor drives based on an adaptive observer with rotor-resistance estimation. Generally, closed-loop induction- motor drives with voltage-source inverters use a speed or position, a dc-link voltage, and two or three phase-current sensors. In the proposed fault-detection and isolation unit, the estimated phase currents and rotor resistance are sent to

Tooraj Abbasian Najafabadi; Farzad R. Salmasi; Parviz Jabehdar-Maralani

2011-01-01

432

Interior permanent magnet synchronous motor (IPMSM), with a developed brain emotional learning based intelligent controller (BELBIC)  

Microsoft Academic Search

In this paper, a modern intelligent control based on computational model of mammalian limbic system and emotional processes (BELBIC) is presented for speed control of interior magnet synchronous motor (IPMSM). In this work, a novel and simple model of IPMSM motor drive control plant is achieved by using the intelligent control system, which controls motor speed accurately, without needing to

E. Daryabeigi; G. A. Markadeh; C. Lucas

2009-01-01

433

Learning Motor Control by Dancing YMCA Rikke Amilde Lvlid  

E-print Network

a robot to extract salient features from a scene by imitating the gaze shifts of a human demonstrator [1]. Wood and Bryson used observations of an expert playing a computer game to make the agent learn whatLearning Motor Control by Dancing YMCA Rikke Amilde L�vlid Department of Computer and Information

Paris-Sud XI, Université de

434

Motor and Executive Control in Repetitive Timing of Brief Intervals  

ERIC Educational Resources Information Center

We investigated the causal role of executive control functions in the production of brief time intervals by means of a concurrent task paradigm. To isolate the influence of executive functions on timing from motor coordination effects, we dissociated executive load from the number of effectors used in the dual task situation. In 3 experiments,…

Holm, Linus; Ullen, Fredrik; Madison, Guy

2013-01-01

435

SPEED PERFORMANCE AND CONTROL OF A MICROMACHINED LINEAR BROWNIAN MOTOR  

E-print Network

SPEED PERFORMANCE AND CONTROL OF A MICROMACHINED LINEAR BROWNIAN MOTOR Ersin Altintas1 , Edin, The University of Tokyo, JAPAN 2 Department of Electrical Engineering, The University of Washington, Seattle, WA, USA contact: ersin@iis.u-tokyo.ac.jp ABSTRACT We report on fabrication and experimental

436

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

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

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

437

Induction of persistent changes in the organisation of the human motor cortex  

Microsoft Academic Search

Motor learning must involve changes in the organisation of the brain, and it seems axiomatic that afferent signals generated\\u000a during repeated motor practice contribute to this. In this study, motor-point stimulation of the first dorsal interosseous\\u000a (FDI) muscle was paired with transcranial magnetic stimulation of the human motor cortex on three successive days to determine\\u000a whether repeated stimulation sessions result

Darrin R. McKay; Michael C. Ridding; Philip D. Thompson; Timothy S. Miles

2002-01-01

438

Motor vehicle pollution control in China -- a strategy for progress  

SciTech Connect

China has a relatively small but rapidly growing motor vehicle population. In anticipation of potentially serious air pollution problems in the future as a result of these vehicles, a multi year effort was undertaken to develop a national strategy for motor vehicle pollution control. This effort entailed a definition of the problem today and in the future, a review of available technological and administrative options and an assessment of the relative cost effectiveness of different strategies. This paper will summarize the results of this project.

Pei, L.; Fu, L.; Walsh, M.P.

1998-12-31

439

Analysis of a three phase induction motor directly from Maxwell's equations  

NASA Astrophysics Data System (ADS)

The torque developed in a three phase AC squirrel cage motor is usually expressed in terms of resistances and reactances of the stator, the rotor, and the motor as a whole. We use Maxwell's equations to find the torque in terms of geometrical parameters. This formulation allows us to estimate the torque developed by a motor without knowing the details of its circuitry.

Bhattacharjee, Shayak

2012-01-01

440

The application of modern signal processing techniques for use in rotor fault detection and location within three-phase induction motors  

Microsoft Academic Search

A commonly used technique for the detection of faults which may occur in three-phase induction motors is to carry out a spectral analysis of the supply current to the motor under investigation. The presence of certain frequency components within the spectral analysis has been shown to be indicative of a fault condition (Hargis et al., 1982). Such techniques are becoming

R. Burnett; J. F. Watson; S. Elder

1996-01-01

441

Comparison of linearized versus nonlinear control of dc stepping motors  

NASA Astrophysics Data System (ADS)

Using state space analysis techniques, two control algorithms for the closed-loop operation of a hybrid dc stepping motor have been simulated by ACSL, and their performance compared. In the simple feedback algorithm employing a reduced-order linear state estimator and linear state variable feedback, the program is estimated to contain 210 bytes and execute in 169 microsec. In the feedback algorithm derived through optimization methods, the program is estimated to contain 1042 bytes and execute in 347 microsec. The nonlinear state estimator is found to provide higher accuracy and greater insensitivity to stepping motor variations, while the optimal control provides more effective use of the available control. The linear control system, however, has a considerably smaller and faster implementation within the digital processor.

Weckel, C.; Hamman, E.; Balas, M.; Lang, J.

442

Motor control strategies in a continuous task space.  

PubMed

Previous studies on sequential effects of human grasping behavior were restricted to binary grasp type selection. We asked whether two established motor control strategies, the end-state comfort effect and the hysteresis effect, would hold for sequential motor tasks with continuous solutions. To this end, participants were tested in a sequential (predictable) and a randomized (nonpredictable) perceptual-motor task, which offered a continuous range of posture solutions for each movement trial. Both the end-state comfort effect and the hysteresis effect were reproduced under predictable, continuous conditions, but only the end-state comfort effect was present under nonpredictable conditions. Experimental results further revealed a work range restriction effect, which was reproduced for the dominant and the nondominant hand. PMID:21878687

Schütz, Christoph; Weigelt, Matthias; Odekerken, Dennis; Klein-Soetebier, Timo; Schack, Thomas

2011-07-01

443

Microgravity induced changes in the control of motor units  

NASA Astrophysics Data System (ADS)

The goal of this project is to understand the effects of microgravity on the control of muscles. It is motivated by the notion that in order to adequately address microgravity-induced deterioration in the force generating capacity of muscles, one needs to understand the changes in the control aspects in addition to histochemical and morphological changes. The investigations into muscle control need to include the regulation of the firing activity of motor units that make up a muscle and the coordination of different muscles responsible for the control of a joint. In order to understand the effects of microgravity on these two aspects of muscle control, we will test astronauts before and after spaceflight. The investigations of the control of motor units will involve intramuscular EMG techniques developed in our laboratory. We will use a quadrifilar electrode to detect simultaneously three differential channels of EMG activity. These data will be decomposed accurately using a sophisticated set of algorithms constructed with artificial intelligence knowledge- based techniques. Particular attention will be paid to the firing rate and recruitment behavior of motor units and we will study the degree of cross-correlation of the firing rates. This approach will enable us to study the firing behavior of several (approx. 10) concurrently active motor units. This analysis will enable us to detect modifications in the control of motor units. We will perform these investigations in a hand muscle, which continues being used in prehensile tasks in space, and a leg muscle whose antigravity role is not needed in space. The comparison of the effects of weightlessness on these muscles will determine if continued use of muscles in space deters the possible deleterious effects of microgravity on the control of motor units, in addition to slowing down atrophy. We are particularly interested in comparing the results of this study to similar data already obtained from elderly subjects, because the deleterious effects of migrogravity on muscles is in many ways similar to that of aging. Additionally, we will employ surface EMG techniques to evaluate the effects of microgravity on the coordination of muscles controlling a joint. We will study if the relative contributions from the muscles around the knee joint are redistributed after exposure to microgravity. The insight to be gained from this study will be important in developing countermeasures for maintaining the force generating capacity of muscles in microgravity and rehabilitation programs for aiding in recovery upon return to earth.

de Luca, C.; Roy, S.

444

DSP based torque and speed controls of the permanent magnet hysteresis synchronous motor  

Microsoft Academic Search

This paper presents the detailed derivation of the permanent magnet hysteresis synchronous motor (PMHS) torque equation and the design of the digital speed controller for the DSP based PMHS motor vector control system. The torque control that regulates the speed of the PMHS motor, is provided by a quadrature axis current command developed by the speed controller. The digital speed

Ruifeng Qin; M. A. Rahman

1997-01-01

445

Inductively heated particulate matter filter regeneration control system  

SciTech Connect

A system includes a particulate matter (PM) filter with an upstream end for receiving exhaust gas, a downstream end and zones. The system also includes a heating element. A control module selectively activates the heating element to inductively heat one of the zones.

Gonze, Eugene V; Paratore Jr., Michael J; Kirby, Kevin W; Phelps, Amanda; Gregoire, Daniel J

2012-10-23

446

Control of cascaded induction generator systems  

NASA Astrophysics Data System (ADS)

This report documents an investigation of the stability and control of cascaded doubly fed machines (CDFM). These machines are brushless variable speed constant frequency electric power generators with potential for application in aircraft. A previous analytical study indicated the CDFM system would be controllable in the subsynchronous operating mode with a passive RL load. The present study contains two steps. First is an investigation of the machine operation in the supersynchronous mode. The second step is an investigation of machine operation with output capacitors providing excitation VARs for the machine and load. Step 1 results show that the machines exhibit stability characteristics in the supersynchronous mode similar to those observed in the subsynchronous mode. Step 2 results show that output capacitors degrade the system performance, particularly at light loads. The results show that output current feedback can be employed to improve the system performance.

Ortmeyer, T. H.

1984-12-01

447

Propulsion control of superconducting linear synchronous motor vehicle  

SciTech Connect

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

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

1997-09-01

448

Motor Control and Regulation for a Flywheel Energy Storage System  

NASA Technical Reports Server (NTRS)

This talk will focus on the motor control algorithms used to regulate the flywheel system at the NASA Glenn Research Center. First a discussion of the inner loop torque control technique will be given. It is based on the principle of field orientation and is implemented without a position or speed sensor (sensorless control). Then the outer loop charge and discharge algorithm will be presented. This algorithm controls the acceleration of the flywheel during charging and the deceleration while discharging. The algorithm also allows the flywheel system to regulate the DC bus voltage during the discharge cycle.

Kenny, Barbara; Lyons, Valerie

2003-01-01

449

Method for controlling a motor vehicle powertrain  

DOEpatents

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

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

1990-01-01

450

Redundancy, Self-Motion, and Motor Control  

PubMed Central

Outside the laboratory, human movement typically involves redundant effector systems. How the nervous system selects among the task-equivalent solutions may provide insights into how movement is controlled. We propose a process model of movement generation that accounts for the kinematics of goal-directed pointing movements performed with a redundant arm. The key element is a neuronal dynamics that generates a virtual joint trajectory. This dynamics receives input from a neuronal timer that paces end-effector motion along its path. Within this dynamics, virtual joint velocity vectors that move the end effector are dynamically decoupled from velocity vectors that do not. Moreover, the sensed real joint configuration is coupled back into this neuronal dynamics, updating the virtual trajectory so that it yields to task-equivalent deviations from the dynamic movement plan. Experimental data from participants who perform in the same task setting as the model are compared in detail to the model predictions. We discover that joint velocities contain a substantial amount of self-motion that does not move the end effector. This is caused by the low impedance of muscle joint systems and by coupling among muscle joint systems due to multiarticulatory muscles. Back-coupling amplifies the induced control errors. We establish a link between the amount of self-motion and how curved the end-effector path is. We show that models in which an inverse dynamics cancels interaction torques predict too little self-motion and too straight end-effector paths. PMID:19718817

Martin, V.; Scholz, J. P.; Schoner, G.

2011-01-01

451

Novel intelligent PID control of traveling wave ultrasonic motor.  

PubMed

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

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

2014-09-01

452

Mixed eccentricity diagnosis in Inverter-Fed Induction Motors via the Adaptive Slope Transform of transient stator currents  

NASA Astrophysics Data System (ADS)

This paper researches the detection of mixed eccentricity in Inverter-Fed Induction Motors. The classic FFT method cannot be applied when the stator current captured is not in steady state, which is very common in these motors. Therefore, a transform able to detect the time-frequency evolutions of the components present in the transient signal captured must be applied. In order to optimize the result, a method to calculate the theoretical time-frequency evolution of the stator current components is presented, using only the captured current. This previously obtained information enables the use of the proposed transform: the Adaptive Slope Transform, based on appropriately choosing the atom slope in each point analyzed. Thanks to its adaptive characteristics, the time-frequency evolution of the main components in a stator transient current is traced precisely and with high detail in the 2D time-frequency plot obtained. As a consequence, the time-frequency plane characteristic patterns produced by the Eccentricity Related Harmonics are easily and clearly identified enabling a reliable diagnosis. Moreover, the problem of quantifying the presence of the fault is solved presenting a simple and easy to apply method. The transform capabilities have been shown successfully diagnosing an Inverter-Fed Induction Motor with mixed eccentricity during a startup, a decrease in the assigned frequency, and a load variation with and without slip compensation.

Pons-Llinares, J.; Antonino-Daviu, J.; Roger-Folch, J.; Moríñigo-Sotelo, D.; Duque-Pérez, O.

2014-10-01

453

Infrared sensor-based temperature control for domestic induction cooktops.  

PubMed

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

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

2014-01-01

454

Infrared Sensor-Based Temperature Control for Domestic Induction Cooktops  

PubMed Central

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

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

2014-01-01

455

DETERMINING MOTOR INERTIA OF A STRESS-CONTROLLED RHEOMETER  

PubMed Central

Synopsis Viscoelastic measurements made with a stress-controlled rheometer are affected by system inertia. Of all contributors to system inertia, motor inertia is the largest. Its value is usually determined empirically and precision is rarely if ever specified. Inertia uncertainty has negligible effects on rheologic measurements below the coupled motor/plate/sample resonant frequency. But above the resonant frequency, G? values of soft viscoelastic materials such as dispersions, gels, biomaterials, and non-Newtonian polymers, err quadratically due to inertia uncertainty. In the present investigation, valid rheologic measurements were achieved near and above the coupled resonant frequency for a non-Newtonian reference material. At these elevated frequencies, accuracy in motor inertia is critical. Here we compare two methods for determining motor-inertia accurately. For the first (commercially-used) phase method, frequency responses of standard fluids were measured. Phase between G’ and G” was analyzed at 5–70 Hz for motor inertia values of 50–150% of the manufacturer’s nominal value. For a newly-devised two-plate method (10 mm and 60 mm parallel plates), dynamic measurements of a non-Newtonian standard were collected. Using a linear equation of motion with inertia, viscosity, and elasticity coefficients, G? expressions for both plates were equated and motor inertia was determined to be accurate (by comparison to the phase method) with a precision of ± 3%. The newly developed two-plate method had advantages of expressly eliminating dependence on gap, was explicitly derived from basic principles, quantified the error, and required fewer experiments than the commercially used phase method. PMID:20890378

Klemuk, Sarah A.; Titze, Ingo R.

2010-01-01

456

Optimization of Fuzzy Controller of Permanent Magnet Synchronous Motor  

NASA Astrophysics Data System (ADS)

Present study aims at discussing how to optimize the fuzzy controller of Permanent Magnet Synchronous Motor (PMSM). By reducing the influence of parameter changes of plant using Technique for Order Performance by Similarity to Ideal Solution (TOPSIS) of Taguchi Method and Multi-Criteria Decision Making (MCDM), it shall be possible to improve robust characteristics of control system, thus promoting the output quality and performance of PMSM plant. Meanwhile, an analytical model for the parameters and output quality of fuzzy controllers was set up and optimal parameters were designed using Genetic Algorithm (GA). Generally speaking, PMSM controller has a long-lasting infrastructure without complex computation, of which the Small-The-Better (STB) output features of PMSM include: Overshoot, rise time and settling time. In previous design of controllers, only individual quality characteristics were considered without overall output design of multiple quality characteristics. By using a controller based on fuzzy logic method in cooperation with parameterization method of TOPSIS, this study intended to discuss how to ensure optimum output quality and performance (overshoot, rise time and settling time) under different noise factors (speeds and loads, etc.). With a PC-based infrastructure that combines PC-based motor controller system and Matlab/Simulink software for simulation process, it seeks to obtain optimum parameters of controllers and implement a PMSM fuzzy control system with vector control function. The computer simulation results have proved the validity and feasibility of entire infrastructure with possible desirable effects.

Yu, Kuang-Cheng; Hsu, Shou-Ping; Hung, Yung-Hsiang

457

A new control method of bearingless switched reluctance motors using square-wave currents  

Microsoft Academic Search

Bearingless switched reluctance motors have the combined characteristics of synchronous motors and magnetic bearings. Radial force production for rotor shaft magnetic suspension is explained with differential stator windings composed of the motor main windings and radial force windings. In this paper, a new control method with square-wave currents in the motor main windings is proposed. Under every condition, from no

Masatsugu Takemoto; Akira Chiba; Tadashi Fukao

2000-01-01

458

Effects of muscle atrophy on motor control  

NASA Technical Reports Server (NTRS)

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

Stuart, D. G.

1985-01-01

459

Closed-loop step motor control using absolute encoders  

SciTech Connect

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

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

1997-08-01

460

A novel PID-based control approach for switched-reluctance motors  

E-print Network

; that of rotor angle estimation for permanent-magnet synchronous motors hence, was not used for tracking controlA novel PID-based control approach for switched-reluctance motors Antonio Lor�ia Gerardo Espinosa�P�erez Erik Chumacero Abstract-- We propose a control strategy for switched- reluctance motors with unknown

Paris-Sud XI, Université de

461

Control of Position\\/Velocity in a Mobile Robot Using DC Brushless Motors  

Microsoft Academic Search

This paper describes the construction of a differential mobile robot using a brushless DC motor coupled to each wheel. Considering that commercial controllers of brushless motors are expensive and they control only velocity, not position; we design and built 3-phase bridges, with N-mosfets, within a electronic circuitry to drive brushless motors. A PWM control scheme and the outputs of the

Leonardo Romero; Antonio Concha

2006-01-01

462

Gut motor function: immunological control in enteric infection and inflammation.  

PubMed

Alteration in gastrointestinal (GI) motility occurs in a variety of clinical settings which include acute enteritis, inflammatory bowel disease, intestinal pseudo-obstruction and irritable bowel syndrome (IBS). Most disorders affecting the GI tract arise as a result of noxious stimulation from the lumen via either microbes or chemicals. However, it is not clear how injurious processes initiated in the mucosa alter function in the deeper motor apparatus of the gut wall. Activation of immune cells may lead to changes in motor-sensory function in the gut resulting in the development of an efficient defence force which assists in the eviction of the noxious agent from the intestinal lumen. This review addresses the interface between immune and motor system in the context of host resistance based on the studies in murine model of enteric nematode parasite infection. These studies clearly demonstrate that the infection-induced T helper 2 type immune response is critical in producing the alterations of infection-induced intestinal muscle function in this infection and that this immune-mediated alteration in muscle function is associated with host defence mechanisms. In addition, by manipulating the host immune response, it is possible to modulate the accompanying muscle function, and this may have clinical relevance. These observations not only provide valuable information on the immunological control of gut motor function and its role in host defence in enteric infection, but also provide a basis for understanding pathophysiology of gastrointestinal motility disorders such as in IBS. PMID:16487236

Khan, W I; Collins, S M

2006-03-01

463

Control of air pollution from new motor vehicle and new motor vehicle engines: submission of altitude performance adjustments for motor vehicles  

SciTech Connect

This U.S. Environmental Protection Agency notice establishes final rules requiring manufacturers of 1981 and earlier model year motor vehicles and motor vehicle engines to submit altitude adjustment instructions for in-use motor vehicles and motor vehicle engines within one year of the effective date. Similar instructions must also be submitted for 1982 and later model year motor vehicles and motor vehicle engines within 30 days from the date on which a certificate of conformity is issued by EPA. These rules are intended to improve the emission control performance of 1981 and later model year light-duty vehicles and light-duty trucks and 1980 and later model year motorcycles that are not designed for operation at high altitude (over 4000 ft above sea level). The rules will become effective on 11/7/80.

Not Available

1980-10-08

464

Application of power spectrum, cepstrum, higher order spectrum and neural network analyses for induction motor fault diagnosis  

NASA Astrophysics Data System (ADS)

The power spectrum is defined as the square of the magnitude of the Fourier transform (FT) of a signal. The advantage of FT analysis is that it allows the decomposition of a signal into individual periodic frequency components and establishes the relative intensity of each component. It is the most commonly used signal processing technique today. If the same principle is applied for the detection of periodicity components in a Fourier spectrum, the process is called the cepstrum analysis. Cepstrum analysis is a very useful tool for detection families of harmonics with uniform spacing or the families of sidebands commonly found in gearbox, bearing and engine vibration fault spectra. Higher order spectra (HOS) (also known as polyspectra) consist of higher order moment of spectra which are able to detect non-linear interactions between frequency components. For HOS, the most commonly used is the bispectrum. The bispectrum is the third-order frequency domain measure, which contains information that standard power spectral analysis techniques cannot provide. It is well known that neural networks can represent complex non-linear relationships, and therefore they are extremely useful for fault identification and classification. This paper presents an application of power spectrum, cepstrum, bispectrum and neural network for fault pattern extraction of induction motors. The potential for using the power spectrum, cepstrum, bispectrum and neural network as a means for differentiating between healthy and faulty induction motor operation is examined. A series of experiments is done and the advantages and disadvantages between them are discussed. It has been found that a combination of power spectrum, cepstrum and bispectrum plus neural network analyses could be a very useful tool for condition monitoring and fault diagnosis of induction motors.

Liang, B.; Iwnicki, S. D.; Zhao, Y.

2013-08-01

465

Mechanisms of Motor Adaptation in Reactive Balance Control  

PubMed Central

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

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

2014-01-01

466

76 FR 17577 - Increased Scope of Coverage for Electric Motors  

Federal Register 2010, 2011, 2012, 2013

...cover squirrel- Motors. cage induction motors, and therefore, DOE believes...standards only cover squirrel- cage induction motors, and therefore, DOE believes...cover squirrel- Motors. cage induction motors, and therefore, DOE...

2011-03-30

467

Induction machine  

DOEpatents

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

Owen, Whitney H. (Ogden, UT)

1980-01-01

468

Improving Induction Motor Efficiency with Die-cast Copper Rotor Cages  

Microsoft Academic Search

This paper examines some of the electromagnetic considerations for achieving near optimum efficiency of a hypothetical 10-Hp industrial motor with a copper rotor cage. The loss budgets for the motor with an aluminum cage and that for a substituted copper cage are calculated using a Matlab program. Rotor bar shape is then varied to improve \\

J. L. Kirtley Jr; J. G. Cowie; D. T. Peters; R. Kimmich

2007-01-01

469

Vibration Suppression of a Flexible Shaft With a Simplified Bearingless Induction Motor Drive  

Microsoft Academic Search

In this paper, we present new strategies of vibration suppression in flexible shaft of a motor with active and passive magnetic forces. Shaft magnetic damping originates from the principle of a bearingless motor having a radial magnetic force generation. Radial force is used for shaft vibration suppression to go through the first critical speed. Simplifications are described in a suppression

Akira Chiba; Tadashi Fukao; M. Azizur Rahman

2008-01-01

470

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

SciTech Connect

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

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

1997-03-01

471

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

NSDL National Science Digital Library

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

Marshall, John

2009-09-22

472

Two-Degree-of-Freedom Self-Tuning Control for Motor Drives Using Pole-Zero Cancellation Method  

NASA Astrophysics Data System (ADS)

In this paper, we present an excellent method named pole-zero cancellation (PZC) for designing motor control systems. PZC is performed in the z plane. A control system consists of three controllers, i.e., a speed controller, a position controller, and an adaptive identifier. The speed controller has two degrees of freedom: disturbance suppression and tracking speed, both of which can be regulated. The pulse transfer function used for regulating the tracking speed has two poles and one zero. When one pole and one zero coincide and cancel each other, the pulse transfer function is of the first-order lag type, and overshoots do not appear. The adaptive controller determines the coefficients of the pulse transfer function and adjusts the speed controller automatically so that the poles and zeros coincide. The transfer function of the position controller also has one pole and one zero, which cancel another pole and zero; pole 1 in the closed loop is not cancelled, and hence, position overshoots do not appear. A 2.2-kW induction motor is tested. The motor torque is controlled using a rapid torque control method. In this paper, first, the tracking-speed characteristics and the tracking-position characteristics are presented. Next, the identified transient coefficients are given, and finally, the disturbance-suppression characteristics are discussed. The experimental results prove the usefulness of the proposed method.

Takano, Akio

473

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

NASA Technical Reports Server (NTRS)

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

Packard, D. T. (inventor)

1985-01-01

474

Voltage Controller Saves Energy, Prolongs Life of Motors  

NASA Technical Reports Server (NTRS)

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

2007-01-01

475

IEEE Transactions on Power Electronics, Vol. 21, No. 5, pp. 1496-1501, 2006. Digital anti-windup PI controllers for variable-speed motor drives using FPGA and  

E-print Network

are applied to the speed control of a field-oriented controlled induction motor drive using a hardware-in-the-loop-windup techniques. The improved speed responses measured from a hardware-in-the-loop test bench confirm-configurability, and direct hardware implementation, while maintaining high control performance. The developed controllers

Collins, Emmanuel

476

Two-Level Temperature Control in Induction Heating  

Microsoft Academic Search

When induction heating two-layer structures, such as a paint coated sheet steel, it is essential that the safe temperature limit of the paint shall not be exceeded. Only the outer surface, but not the paint¿steel interface¿is accessible to measurement.By controlling the constant temperature of the outer surface at two subsequent levels, it is possible to maintain a constant and known

Eugene Mittelmann

1975-01-01

477

The design of new low-voltage motor protection controller based on ARM technology  

Microsoft Academic Search

In this paper, the protection of a new low-voltage motor controller is introduced based on ARM technology, the LPC2136 is applied as motor control center. The composition of systems and signal processing are described in detail. The design makes full use of internal hardware resource, prevents motor damage effectively, and includes protection, measurement and all.

Ying Tang

2009-01-01

478

To appear in: M. Gazzaniga, (Ed.). The Cognitive Neurosciences. Cambridge, MA: MIT Press. Computational motor control  

E-print Network

. Computational motor control Michael I. Jordan Department of Brain and Cognitive Sciences Massachusetts Institute London Running Title: Computational motor control #12; Jordan & Wolpert 2 Abstract We discuss some computational #12; Jordan & Wolpert 3 schema in Figure 1. The first issue is that of motor planning, which we

Jordan, Michael I.

479

Analysis and microprocessor implementation of field oriented control for permanent magnet hysteresis synchronous motor  

Microsoft Academic Search

An analytical motor for a permanent magnet hysteresis hybrid synchronous motor has been developed. A microprocessor-based field oriented control scheme has been successfully experimented for a laboratory magnet hysteresis motor. A scheme for measuring the torque angle is proposed. The test results confirm the improvement of the dynamic performances using a field-oriented control strategy

J. Qian; M. Azizur Rahman

1991-01-01

480

Identification and robust control of an experimental servo motor.  

PubMed

In this work, the design of a robust controller for an experimental laboratory-scale position control system based on a dc motor drive as well as the corresponding identification and robust stability analysis are presented. In order to carry out the robust design procedure, first, a classic closed-loop identification technique is applied and then, the parametrization by internal model control is used. The model uncertainty is evaluated under both parametric and global representation. For the latter case, an interesting discussion about the conservativeness of this description is presented by means of a comparison between the uncertainty disk and the critical perturbation radius approaches. Finally, conclusions about the performance of the experimental system with the robust controller are discussed using comparative graphics of the controlled variable and the Nyquist stability margin as a robustness measurement. PMID:12071255

Adam, E J; Guestrin, E D

2002-04-01