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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 Astrophysics Data System (ADS)

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

Hansen, Irving G.

3

Induction motor control  

NASA Technical Reports Server (NTRS)

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

Hansen, Irving G.

1990-01-01

4

Induction Motor Control.  

National Technical Information Service (NTIS)

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 induc...

I. G. Hansen

1990-01-01

5

Adaptive decoupling control of induction motor drives  

Microsoft Academic Search

A novel control approach for a robust induction motor drive system with a voltage source inverter has been developed. In the scheme, the induction motor and its corresponding inverter gating signal are controlled using the decoupling control theory. In addition, an adaptive optimal speed regulator employing the model reference adaptive control (MRAC) is incorporated into the drive system to compensate

C. C. Chan; W. S. Leung; C. W. Ng

1990-01-01

6

Nonlinear control for sensorless induction motor drives  

Microsoft Academic Search

A original approach is presented for the problem of nonlinear control for sensorless induction motor drives. Two aspects are studied in this paper, the rotor flux and rotation speed simultaneous observation and the nonlinear control of the induction motor. The use of the Popov hyperstability theory permits to realize an adaptive state observer (MRAS technique). The speed and flux controllers

M. Pietrzak-David; B. de Fornel; M. A. Purwoadi

1998-01-01

7

On speed control of induction motors  

Microsoft Academic Search

In a recent paper [(Espinosa-Pérez and Ortega, 1994). State observers are unnecessary for induction motor control. Syst. & Control Lett., 23, 315–323] Espinosa and Ortega presented an output feedback globally stable speed tracking controller for induction motors. The performance of the scheme is limited by the fact that the convergence rate of the speed tracking errors is determined by the

Romeo Ortega; Per Johan Nicklasson; Gerardo Espinosa-Pérez

1996-01-01

8

Sensorless control of induction motor drives  

Microsoft Academic Search

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

JOACHIM HOLTZ

2002-01-01

9

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.

10

Four quadrant control of induction motors  

NASA Technical Reports Server (NTRS)

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

Hansen, Irving G.

1991-01-01

11

Field oriented control of induction motors  

NASA Technical Reports Server (NTRS)

Induction motors have always been known for their simple rugged construction, but until lately were not suitable for variable speed or servo drives due to the inherent complexity of the controls. With the advent of field oriented control (FOC), however, the induction motor has become an attractive option for these types of drive systems. An FOC system which utilizes the pulse population modulation method to synthesize the motor drive frequencies is examined. This system allows for a variable voltage to frequency ratio and enables the user to have independent control of both the speed and torque of an induction motor. A second generation of the control boards were developed and tested with the next point of focus being the minimization of the size and complexity of these controls. Many options were considered with the best approach being the use of a digital signal processor (DSP) due to its inherent ability to quickly evaluate control algorithms. The present test results of the system and the status of the optimization process using a DSP are discussed.

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

1990-01-01

12

Synergetic control approach for induction motor speed control  

Microsoft Academic Search

This paper presents the synergetic control approach for induction motor speed control using indirect vector control. Synergetic control theory has several advantages: it is well suited for digital control purpose and it operates at constant switching frequency, which simplifies filtering design, and reduces chattering, while maintaining the intrinsic robust features of sliding mode control. To verify the performance characteristics of

Young-Dae Son; Tae-Won Heo; Enrico Santi; Antonello MOnti

2004-01-01

13

Power factor control system for AC induction motors  

NASA Technical Reports Server (NTRS)

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

Nola, F. J. (inventor)

1977-01-01

14

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...

15

Fuzzy Logic Control of AC Induction Motors.  

National Technical Information Service (NTIS)

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. Electric motors use 60% of the electr...

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

1992-01-01

16

Predictive Direct Torque Control for Induction Motor Drive  

NASA Astrophysics Data System (ADS)

A predictive control combined with the direct torque control (DTC) to induction motor drive is presented. A new switching strategy is used in DTC, where the constant switching frequency is taken constant, and the speed tracking is done by a predictive controller. The scheme control is applied to induction motor drive in order to perform the dynamic responses of electromagnetic torque, stator flux and speed. A comparison between the PI controller and predictive controller for speed tracking is done. Results of simulation show that the performance of the proposed control scheme for induction motor drive is accurately achieved.

Benzaioua, A.; Ouhrouche, M.; Merabet, A.

2008-06-01

17

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

18

Decoupling control of induction motor drives  

Microsoft Academic Search

The decoupling control of induction machines is investigated. Three different schemes for decoupling-control methods based on stator flux, airgap flux, and rotor flux field regulation are developed. The control dynamics of each scheme are outlined and studied. Simulation results are presented to verify that these schemes provide decoupling control with excellent dynamic behavior. The transient and steady-state relationships between slip

EDWARD Y. Y. HO; P. C. Sen

1988-01-01

19

MIMO Indirect Adaptive Fuzzy Control of Induction Motors  

Microsoft Academic Search

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

Manal Wahba

2007-01-01

20

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

21

A single phase induction motor voltage controller with improved performance  

NASA Astrophysics Data System (ADS)

Induction motors inherently operate with nearly constant airgap flux and therefore almost constant iron losses. When the load does not require full flux, conventional voltage controllers utilize thyristors in series with the motor to reduce airgap flux by decreasing the applied voltage. Thereby, iron losses decrease and the overall efficiency increases. However, thyristor voltage controllers tend to introduce harmonics into the current waveform which not only reduces motor efficiency but also causes harmonic pollution of the power lines. An improved voltage controller and control strategy for efficiency improvement of single phase induction motors is presented. In particular, thyristor voltage control by dynamic switching of the winding configuration is presented. Laboratory data for a voltage controller, thus enhanced, demonstrates a significant decrease in input motor current distortion and increase in efficiency below one-quarter load.

Law, Joseph D.; Lipo, Thomas A.

1986-10-01

22

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

23

Efficiency Optimizing Control of Induction Motor Using Natural Variables  

Microsoft Academic Search

This paper presents a new approach of optimizing the efficiency of induction-motor drives through minimizing the copper and core losses. The induction-machine model, which accounts for the varying core-loss resistance and saturation dependent magnetizing inductance, uses natural and reference frame independent quantities as state variables. Utilization of the nonlinear geometric control methodology of input-output linearization with decoupling permits the implementation

Gan Dong; Olorunfemi Ojo

2006-01-01

24

Implementation of a new fuzzy vector control of induction motor.  

PubMed

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

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

2014-05-01

25

Sensorless Induction Motor Control Using Low-Cost Electrical Sensors  

Microsoft Academic Search

This paper presents a sensorless control strategy for induction motors using low cost electrical sensors. The main contribution is the use of low-cost electrical sensors. It is allowed thanks to the use of a linear Kalman filter. To achieve state estimates as close as possible to the optimal ones it is also presented a procedure to perform the tuning of

Rafael Cardoso; H. T. Camara; H. A. Grundling

2005-01-01

26

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

27

Direct Torque Control of Double-Star Induction Motors  

Microsoft Academic Search

The object of this paper is to study a new control structure for sensorless double-star induction motors (DSIM) dedicated to electrical drives using a two-level voltage source inverter (VSI). The output voltages of PWM inverter can be represented by 8 space vectors in (d , q) plane, two zero vectors and six non- zero vectors which divide the (d ,

R. Zaimeddine; E. M. Berkouk

2006-01-01

28

Braking methods of induction motor using direct torque control  

Microsoft Academic Search

This paper studies the performance of the three phase induction motor with different methods of braking, such as forward plugging, ac dynamic braking and reverse plugging braking using direct torque control (DTC). The simulation results are validated with the practical results under different conditions. The paper presents a solution to decrease the energy losses resulting from traditional methods of braking

G. M. A. Sowilam; M. I. Korfly; A. A. Hassan

2006-01-01

29

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

30

Networked based control and supervision of induction motor using OPC server and PLC  

Microsoft Academic Search

This paper presents the control of induction motor via PROFINET network including a remote control using the OPC (OLE for Process Control) standard. This system is composed of induction motor, encoder, frequency converter, PLC (Programmable Logic Controller) and two PCs (server and client). The motor control is PLC based with PID (Proportional-Integral-Derivative) controller, while PCs are used as HMI (Human

Jasmin Velagic; Admir Kaknjo; Nedim Osmic; Tarik Dzananovic

2011-01-01

31

PWM-CSI induction motor drive with phase angle control  

Microsoft Academic Search

The authors describe a pulse-width-modulated current-source inverter drive system using an induction motor. Its dominant feature is that it provides adequate control of either torque or speed over a wide range without requiring a shaft position or speed sensor. The capacitor-loaded current-source invertor system has the advantages of simplicity, low switching frequency, four-quadrant operation, overcurrent protection, and low harmonic content

Bin Wu; Gordon R. Slemon; Shashi B. Dewan

1991-01-01

32

Dynamic Model Based Vector Control of Linear Induction Motor.  

National Technical Information Service (NTIS)

Induction machines (IM) have been the workhorse of industry due to their robustness, simple and rugged structure, low cost and reliability. Traditionally, AC machines have been used in open-loop constant speed applications. The linear induction motor (LIM...

A. Rimmele Q. Dong S. Biswas V. Rafalko

2012-01-01

33

ANFIS based soft-starting and speed control of AC voltage controller fed induction motor  

Microsoft Academic Search

An intelligent AC voltage controller is proposed for the control of induction motor. It controls the motor speed by adjusting the firing angles of the thyristors. Adaptive network fuzzy inference system (ANFIS) based controller was designed for open-loop sensor less control. The results obtained were satisfactory and promising. In addition to simplicity, stability, and high accuracy such controller gives soft

Mohammad Ayyub

2006-01-01

34

Optimized neural network speed control of induction motor using genetic algorithm  

Microsoft Academic Search

For the high performance drives of induction motor, recurrent artificial neural network (RNN) based self tuning speed controller is proposed. RNN provides a nonlinear modeling of motor drive system and could give the information of the load variation, system noise and parameter variation of induction motor to the controller through the on-line estimated weights of corresponding RNN. Self tuning controller

W. S. Oh; K. M. Cho; S. Kim; H. J. Kim

2006-01-01

35

Discrete time direct torque control of induction motors using back-EMF measurement  

Microsoft Academic Search

The authors present a fixed switching frequency pulse width modulated (PWM) inverter based induction motor direct torque control. The proposed method controls motor torque and stator flux amplitude and is developed in discrete time to allow implementation on microcontrollers or digital signal processors (DSP). The proposed control requires knowledge of a small number of induction motor parameters, viz only stator

Jehudi Maes; Jan Melkebeek

1998-01-01

36

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

37

Dual-DSP sensorless speed control of an induction motor with adaptive voltage compensation  

Microsoft Academic Search

This paper presents a new sensorless speed control scheme for adjustable AC induction motor drives. In the proposed scheme, rotor flux oriented vector control is used to decouple nonlinearity of the induction motor and a stator flux-based flux estimator is used estimate the synchronous speed. The motor speed can be estimated using only the phase currents and DC-link voltage. An

Ying-Yu Tzou; Wen-Ao Lee; Shiu-Yung Lin

1996-01-01

38

Reduction control of mechanical vibration of an induction motor with fluctuated torque load using repetitive controller  

Microsoft Academic Search

Authors propose a method to reduce the vibration of the V\\/F controlled induction motor with a fluctuated torque load by repetitive control utilizing acceleration sensor. It is easy to install the acceleration sensor on the motor or load frame. Because the load torque varies periodically, the repetitive control is considered effective for reduction of the vibration. Approximate analysis is performed

Muneaki Ishida; Shinichi Higuchi; Takamasa Hori

1994-01-01

39

T-DOF PI Controller Design for a Speed Control of Induction Motor  

Microsoft Academic Search

This paper presents design and implements the T-DOF PI controller design for a speed control of induction motor. The voltage source inverter type space vector pulse width modulation technique is used the drive system. This scheme leads to be able to adjust the speed of the motor by control the frequency and amplitude of the input voltage. The ratio of

Tianchai Suksri

2007-01-01

40

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

Microsoft Academic Search

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

Min-Ho Park; Kyung-Seo Kim

1991-01-01

41

Induction Motor Speed Control with Static Inverter in the Rotor  

Microsoft Academic Search

A speed regulating scheme using a wound rotor induction motor and a static synchronous inverter is investigated. The purpose of the inverter is to receive the slip power from the rotor and to deliver it to the ac line.

A. Lavi; R. J. Polge

1966-01-01

42

Five-phase induction motor drives with DSP-based control system  

Microsoft Academic Search

This paper introduces two kinds of control schemes: vector control and direct torque control (DTC). These control schemes can be extensively applied to the operation of a five-phase induction motor using a fully digital implementation. Vector control of the five-phase induction motor not only achieves high drive performance, but also generates the desired nearly rectangular current waveforms and flux profile

Huangsheng Xu; Hamid A. Toliyat; Lynn J. Petersen

2002-01-01

43

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

44

Neural and Fuzzy Adaptive Control of Induction Motor Drives  

SciTech Connect

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

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

2008-06-12

45

Elimination of saturation effects in sensorless position controlled induction motors  

Microsoft Academic Search

Owing to the variable magnetic coupling between the stator windings and the discrete rotor bars of an induction motor, a quasi-continuous rotor position signal can be acquired by instantaneous measurement of the total leakage inductance of the three stator phases. The signals are sampled in synchronism with the regular commutations of the PWM process, thus making the injection of additional

Joachim Holtz; Hangwen Pan

2002-01-01

46

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

47

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

48

Modeling and control of V\\/f controlled induction motor using genetic-ANFIS algorithm  

Microsoft Academic Search

This paper deals with modeling and performance analysis of the voltage\\/frequency (V\\/f) control of induction motor drives. The V\\/f control, which realizes a low cost and simple design, is advantageous in the middle to high-speed range. Its torque response depends on the electrical time constant of the motor and adjustments of the control parameters are not need. Therefore, V\\/f control

Seydi Vakkas Ustun; Metin Demirtas

2009-01-01

49

Resilient current control of five-phase induction motor under asymmetrical fault conditions  

Microsoft Academic Search

This paper presents the resilient current control of a five-phase induction motor under asymmetrical fault conditions. This kind of control scheme ensures that the five-phase induction motor operates continuously and steadily without additional hardware connections in case of loss of up to two phases, which is of importance to some specific applications where fault tolerance and high reliability are required.

Huangsheng Xu; Hamid A. Toliyat; Lynn J. Petersen

2002-01-01

50

Application of Fuzzy Logic in the Phase-Locked Loop Speed Control of Induction Motor Drive  

Microsoft Academic Search

A phase-locked loop induction motor speed drive incorporating a fuzzy logic controller is presented. The proposed system combines the excellent speed regulation of the phaselocked loop techniques and the advantages of fuzzy logic (intuitiveness, simplicity, easy implementation, and minimal knowledge of system dynamics) to obtain a robust, fast, and precise control of induction motor speed. An experimental system is implemented

Mao-Fu Lai; Michio Nakano; Guan-Chyun Hsieh

1996-01-01

51

Direct Torque Control for Induction Motor Drives: A Model Predictive Control Approach Based on Feasibility  

Microsoft Academic Search

Abstract. In this paper, we present a new approach to the Direct Torque Control (DTC) problem of three-phase induction motor drives. This approach is based on Model Predictive Control (MPC) exploiting the specific structure of the DTC problem and using a systematic design procedure. Specifically, by observing that the DTC objectives, which re- quire the controlled variables to remain within

Tobias Geyer; Georgios Papafotiou

2005-01-01

52

Efficiency Optimization Control of AC Induction Motors: Initial Laboratory Results.  

National Technical Information Service (NTIS)

A fuzzy logic, energy optimizing controller has been developed to improve the efficiency of motor/drive combinations which operate at varying load and speed conditions. The energy optimizer is complemented by a sensorless speed controller which maintains ...

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

1996-01-01

53

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...

54

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

Microsoft Academic Search

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

C. C. Chan; HUAQIAN WANG

1990-01-01

55

Induction motor drive with intelligent controller and parameter adaption  

Microsoft Academic Search

A variable speed four-quadrant AC-motor drive using a robust and cost-effective induction machine with a current source inverter with gate turn-off thyristors (GTOs) was investigated. The essential advantage of this topology is the ability to produce currents and voltages in the machine with very low harmonic content in the whole operating range. Therefore, with this solution torque ripple, noise, and

D. Hintze; D. Schroder

1992-01-01

56

A Sliding Mode Speed Control of an Induction Motor  

Microsoft Academic Search

Field-oriented control was combined to robust sliding mode for motor speed control. A smooth continuous function was added in order to overcome chattering caused by Sliding Mode Controller (SMC). Simulation results showed that improvement made by our approach compared to classical PID control.

Kais JAMOUSSI; Mohamed OUALI; Hassen CHARRADI

2007-01-01

57

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

58

GA-Based Optimization of PI Speed Controller Coefficients for ANN-Modelled Vector Controlled Induction Motor  

NASA Astrophysics Data System (ADS)

This study proposes a new approach to indirect vector controlled induction motor drives. Induction motor drives for variable speed have many common industrial applications. An application of Artificial Neural Network (ANN) and genetic algorithms on vector control are carried out using space vector pulse width modulation in this study. Proportional plus derivative (PI) controller is used to control speed of induction motor. In this study, optimization of PI coefficients in vector control is carried out by ANN-Genetic. These controllers are applied to drive system with 0.55 kW induction motor. A Digital Signal Processor Controller (dsPIC30F6010) was used to carry out control applications. It is suitable to control induction motor as a soft starter and speed adjustment in compressors, blowers, fans, pumps and many other applications.

Vakkas Ustun, Seydi

59

Implementation of damped-oscillation crane control for existing AC induction motor-driven cranes.  

National Technical Information Service (NTIS)

The Oak Ridge National Laboratory (ORNL) has implemented damped-oscillation crane control on one of its existing ac induction motor-driven facility overhead cranes. The purpose of this engineering grade test has been to determine feasibility, determine co...

M. W. Noakes R. L. Kress G. T. Appleton

1993-01-01

60

Improvement of induction motor drive systems supplied by photovoltaic arrays with frequency control  

Microsoft Academic Search

The overall efficiency of an induction motor drive system, powered by a PV array, drops significantly when the insolation condition varies away from its nominal level. This problem can be overcame using a control method in which the frequency of the inverter's PWM control signal is adjusted according to the insolation and temperature conditions. The motor speed, and therefore, the

Y. Yao; P. Bustamante; R. S. Ramshaw

1994-01-01

61

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

62

Adaptative Variable Structure Control for an Online Tuning Direct Vector Controlled Induction Motor Drives  

NASA Astrophysics Data System (ADS)

This study demonstrates that high performance speed control can be obtained by using an adaptative sliding mode control method for a direct vector controlled Squirrel Cage Induction Motor (SCIM). In this study a new method of designing a simple and effective adaptative sliding mode rotational speed control law is developed. The design includes an accurate sliding mode flux observation from the measured stator terminals and rotor speed. The performance of the Direct Field-Orientation Control (DFOC) is ensured by online tuning based on a Model Reference Adaptative System (MRAS) rotor time constant estimator. The control strategy is derived in the sense of Lyapunov stability theory so that the stable tracking performance can be guaranteed under the occurrence of system uncertainties and external disturbances. The proposed scheme is a solution for a robust and high performance induction motor servo drives. Simulation results are provided to validate the effectiveness and robustness of the developed methodology.

Lasaad, Sbita; Dalila, Zaltni; Naceurq, Abdelkrim Mohamed

63

Hardware-in-Loop Simulation of Direct Torque Controlled Induction Motor  

Microsoft Academic Search

In this paper, a method for design and implementation of direct torque control (DTC) strategy of induction motor based on hardware-in-loop simulation (HIL) is proposed. The hardware in loop simulation offers the rapid prototyping by reducing time in development and cost. The DTC controller for induction motor is designed and simulation is carried out to test the performance in Simulink\\/MATLAB.

P. K. Gujarathi; M. V. Aware

2006-01-01

64

Direct Torque Control scheme for dual-three-phase induction motor  

Microsoft Academic Search

In this paper, Direct Torque Control (DTC) algorithms for dual three-phase induction motor fed by six phases Voltage Source Inverter (VSI) is described. The induction machine has two sets of three-phase stator windings spatially shifted by arbitrary angle. The machine dynamic model is based on the vector space decomposition theory. Optimal switching strategies to control the machine for different winding

R. Zaimeddine; T. Undeland

2010-01-01

65

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

Microsoft Academic Search

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

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

1967-01-01

66

Research on Direct Torque Control of Induction Motor Based on TMS320LF2407A  

NASA Astrophysics Data System (ADS)

The direct torque control of Induction Motor is one of the high performance control system, which was proposed after the vector control scheme. During the recent 20 years, It has been developed rapidly for its concise system scheme, excellent dynamic and static performances. DTC system directly controls the electromagnetic torque and stator flux, using the analyzing method of space vector and stator flux orientation. This paper establishes the mathematical model of direct torque control (DTC) system of induction motor, and direct torque control (DTC) scheme of induction motor based on TMS320LF2407A is introduced. The control scheme gets the switch control signal of inverter with the space voltage vector modulation technology. Finally the approach has been implemented on DSP in a 1.1 kW drive. The results show that the DTC with SVPWM has many merits such as simple realization, good running performance and high voltage utilization ratio.

Lufei, Xu; Guangqun, Nan

67

A Non-Standard Robust Adaptive Stator Current Control Strategy for Induction Motor Drives  

Microsoft Academic Search

This paper presents a new robust adaptive current control strategy for induction motor drive systems. This control scheme is based on an adaptive pole placement control strategy (APPC) integrated to a sliding mode control scheme (SMC). The proposed APPC employs the internal model principle for achieving a zero steady state tracking error of machine stator currents. Moreover, this current controller

R. L. A. Ribeiro; C. B. Jacobina; A. D. Araiijo; M. B. Santos; A. C. Oliveira

2007-01-01

68

Adaptive speed control of AC servo induction motors with on-line load estimation  

Microsoft Academic Search

An adaptive speed control with load torque compensation for AC servo induction motors is proposed. This adaptive control loop that precedes the field oriented control loop consists of a proportional plus integral (PI) controller and a load torque compensator. Their control gains are adjusted adaptively in terms of estimated parameters of an estimation model. The estimation model is a simple

Yee-Ping Yang; Chuan-Feng Fang

1994-01-01

69

Internal Model Controller of an ANN Speed Sensorless Controlled Induction Motor Drives  

NASA Astrophysics Data System (ADS)

This study deals with the performance analysis and implementation of a robust sensorless speed controller. The robustness is guaranteed by the use of the Internal Model Controller (IMC). An intelligent algorithm is evolved to eliminate the mechanical speed. It is based on the Artificial Neural Network (ANN) principle. Verification of the proposed robust sensorless controller is provided by experimental realistic tests on a scalar controlled induction motor drive. Sensorless robust speed control at low speeds and in field weakening region (high speeds) is studied in order to show the robustness of the speed controller under a wide range of load.

Hamed Mouna, Ben; Lassaad, Sbita

70

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

71

Study on an Application of Induction Motor Speed Sensorless Vector Control to Railway Vehicle Traction  

NASA Astrophysics Data System (ADS)

The Pulse Generators or PGs are equipped to detect the rotor frequency of induction traction motors for the torque control in railway vehicle traction field. Eliminating PGs are preferable from the view points of increasing the reliability of the traction system, reduction of the both initial and maintenance cost and down-sizing induction traction motors. Expecting those merits, we have been studying to apply a sensor less control method to induction traction motor control. Prior to some reports of studies and tests to apply speed sensor-less strategy to railway vehicle traction, we lunched the ideas to apply the speed sensor-less control strategy and results of the studies and the tests. In this paper, we present the novel control method for railway vehicle traction and some results of theoretical study and tests.

Kondo, Keiichiro; Yuki, Kazuaki

72

Robust Backstepping Control of Induction Motor Drives Using Artificial Neural Networks  

Microsoft Academic Search

In this paper, using the three-phase induction motor (IM) fifth order model in a stationary two axis reference frame with stator current and rotor flux as state variables, a conventional backstepping controller is designed first for speed and rotor flux control of an IM drive. Then in order to make the control system stable and robust against the parameter uncertainties

J. Soltani; R. Yazdanpanah

2006-01-01

73

Precise Control of a Three-Phase Squirrel-Cage Induction Motor Using a Practical Cycloconverter  

Microsoft Academic Search

The advent of the silicon controlled rectifier has permitted the design of a practical cycloconverter source of 3-phase electrical power which can be continuously controlled in frequency, from dc to approximately one-half the input power frequency, as required to control the speed of a 3-phase induction motor. The correspondence between the applied stator frequency, the resulting magnetic flux phase rotation,

Walter Slabiak; Louis J. Lawson

1966-01-01

74

Induction Motor Speed Control via Fuzzy Logic Modification of Reference Model  

Microsoft Academic Search

A novel model reference adaptive control scheme using reference model modification through fuzzy logic to control the speed of an induction motor is presented. This scheme is developed to cope with uncertainties and disturbances that the plant under control might undergo where a single reference model can not handle. The main concept of the proposed philosophy is to ensure automatic

Khalid S. Al-Olimat; Adel A. Ghandakly; Sukumar Kamalasadan

2007-01-01

75

Direct Torque Control for a Matrix Converter Based on Induction Motor Drive Systems  

Microsoft Academic Search

The paper proposes a direct torque control (DTC) scheme for a matrix-converter-fed induction motor drive system. DTC is a high performance motor control scheme with fast torque and flux responses. However, the main disadvantage of conventional DTC is electromagnetic torque ripple. Besides, the matrix converter is a single-stage ac-ac power conversion device without dc-link energy storage elements. Due to the

Der-Fa Chen; Chin-Wen Liao; Kai-Chao Yao

2007-01-01

76

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

77

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

PubMed Central

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

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

2012-01-01

78

Real-time sliding-mode observer and control of an induction motor  

Microsoft Academic Search

This paper deals with the control and observation of an induction motor using a sliding-mode technique. The authors' aim is to regulate the speed and the square of the rotor flux magnitude to specified references. Assuming that all the states are measured, sliding surfaces are proposed within a sliding-mode control framework. Then, the stator voltages are derived such that the

Abdelkrim Benchaib; Ahmed Rachid; Eric Audrezet; Mohamed Tadjine

1999-01-01

79

Output feedback control of current-fed induction motors with unknown rotor resistance  

Microsoft Academic Search

On the basis of a third-order reduced model of an induction motor (current-fed) the authors design an output feedback control (from rotor speed measurements) which guarantees global exponential tracking of speed and rotor flux modulus reference signals. An adaptive version is designed when load torque is constant and unknown. The rotor resistance, which is a crucial parameter for the control,

Riccardo Marino; Sergei Peresada; Patrizio Tomei

1996-01-01

80

Microprocessor-Based Field-Oriented Control of A CSI-Fed Induction Motor Drive  

Microsoft Academic Search

This paper describes the method of field orientation of the stator current vector with respect to the stator, mutual, and rotor flux vectors, for the control of an induction motor fed from a current source inverter (CSI). A control scheme using this principle is described for orienting the stator current with respect to the rotor flux, as this gives natural

S. Sathiakumar; S. K. Biswas; Joseph Vithayathil

1986-01-01

81

Efficiency-optimized control of a linear induction motor for railway traction  

Microsoft Academic Search

A new efficiency-optimized strategy of LIM (Linear Induction Motor) for Linear Metro is proposed in this paper. First, a dynamic mathematical model of LIM is derived based on analyzing the end effect. Then a field orientation control scheme with the actual parameters is developed. Based on the mathematical model of LIM, optimal flux control based on model is raised so

Yang Zhongping; Gu Yun; Liu Jianqiang; Trillion Zheng

2007-01-01

82

Speed control of induction motor without rotational transducers  

Microsoft Academic Search

This paper describes a newly developed speed sensorless drive based on neural networks. A backpropagation neural network is used to provide real-time adaptive identification of the motor speed. The estimation objective is the sum of squared errors between a target trajectory and the neural network model output. A backpropagation algorithm is used to adjust the motor speed, so that the

Lazhar Ben-Brahim; Susumu Tadakuma; Alper Akdag

1999-01-01

83

Smooth speed control of single-phase induction motors by integral-cycle switching  

Microsoft Academic Search

AC phase controlled switching is used for the speed control of single-phase induction motors but it introduces large high-order harmonics. Alternatively, an integral-cycle control method is also available but it introduces sub-harmonics in the line and the output voltage is adjustable in steps only. To mitigate these situations, a discontinuous phase-controlled switching technique is proposed. The voltage control is done

M. Syed Jarnil Asghar

1999-01-01

84

Improvement of induction motor drive systems supplied by photovoltaic arrays with frequency control  

SciTech Connect

The overall efficiency of an induction motor drive system, powered by a photovoltaic (PV) array, drops significantly when the insolation condition varies away from its nominal level. This problem can be overcome using a control method in which the frequency of the inverter's PWM control signal is adjusted according to the insolation and temperature conditions. The motor speed and, therefore, the power delivered to the load, are adjusted by controlling the inverter's frequency. This eliminates the mismatch between the maximum power that is available from the source and the power that is required by the load. Simulation results presented in this paper show that using the proposed control system allows the induction motor drive system to maintain its optimum efficiency and deliver consistently more power to the load when insolation and temperature vary from the nominal level. This method also offers an improvement in the system stability method.

Yao, Y.; Ramshaw, R.S. (Univ. of Waterloo, Ontario (Canada). Dept. of Electrical and Computer Engineering); Bustamante, P. (Novatronics Inc., Stratford, Ontario (Canada))

1994-06-01

85

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

86

A three level NPC inverter with neutral point voltage balancing for induction motors Direct Torque Control  

Microsoft Academic Search

In this paper, we present a new Direct Torque Control (DTC) scheme for induction motors using a three-level neutral point clamped (NPC) voltage source inverter (VSI). In order to develop high dynamic performances, we propose a new approach, in which we enhance the responses of the torque and the flux with optimal switching strategies. Serious problems caused by significant fluctuations

Hamza Alloui; Abderrahmane Berkani; Hacene Rezine

2010-01-01

87

Global adaptive output feedback control of induction motors with uncertain rotor resistance  

Microsoft Academic Search

The authors design a global adaptive output feedback control for a fifth-order model of induction motors, which guarantees asymptotic tracking of smooth speed references on the basis of speed and stator current measurements, for any initial condition and for any unknown constant value of torque load and rotor resistance. The proposed seventh-order nonlinear compensator generates estimates both for the unknown

Riccardo Marino; Sergei Peresada; Patrizio Tomei

1999-01-01

88

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

Microsoft Academic Search

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

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

1991-01-01

89

Nonlinear control of induction motors: torque tracking with unknown load disturbance  

Microsoft Academic Search

Ortega and Espinosa (1993) presented a globally stable controller for torque regulation of a complete induction motor model with partial state feedback, i.e., no assumption of flux measurement. The result was established under the assumptions that both the desired and load torques are constant, that the former does not exceed certain bounds which depend on the systems natural damping, and

Romeo Ortega; Carlos Canudas; Seleme I. Seleme

1993-01-01

90

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

91

Transition from slip-frequency control to vector control for induction motor drives of traction applications in Japan  

Microsoft Academic Search

AC motor drive systems for electric rolling stocks with variable-voltage, variable-frequency inverters have many features such as high performance, maintenance free, smaller size and light weight. This paper describes brief history on control methods for induction motor drives of railway traction applications in Japan. That is the transition from the slip-frequency control to the vector control. Furthermore the superiority of

M. Yano; Michio Iwahori

2003-01-01

92

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

Microsoft Academic Search

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

F. J. Nola

1975-01-01

93

Smooth speed control of three-phase induction motor by integral-cycle switching  

Microsoft Academic Search

The speed of three-phase induction motors can be controlled in steps by controlling the applied voltage using an integral-cycle switching method. However, the OFF period causes large pulsations in generated torque. Moreover the induced EMF in the windings and decelerating rotor during the OFF period, cause large reswitching currents as well as large transient-negative torques. They cause abnormal performance of

M. S. J. Asghar; M. M. Shees

1996-01-01

94

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

Microsoft Academic Search

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

Masato Koyama; Masao Yano; Isao Kamiyama; Sadanari Yano

1986-01-01

95

Speed control of three phase induction motor using single phase supply along with active power factor correction  

Microsoft Academic Search

Majority of industrial drives use electric motors, since they are controllable and readily available. In practice, most of these drives are based on ac induction motor because these motors are rugged, reliable, and relatively inexpensive. The proposed technique of single phase to three phase conversion has a wide range of applications in rural areas and also in industries where three

Pradeep M Patil; Sanjay L Kurkute

2006-01-01

96

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

Microsoft Academic Search

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

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

97

Takagi-Sugeno Fuzzy Fault-Tolerant Control of an Induction Motor  

Microsoft Academic Search

This paper demonstrates the application of a new fault-tolerant control scheme for a rail vehicle traction system using digital\\u000a signal processing hardware and a representative induction motor test-rig. The approach presented takes into account the stability\\u000a and design of non-linear fuzzy inference systems based on Takagi–Sugeno (T-S) fuzzy models. The paper derives the necessary\\u000a conditions for the assignability of eigenvalues

C. J. Lopez-toribio; Ron J. Patton; Steve Daley

2000-01-01

98

Speed sensorless field-oriented control of induction motor with rotor resistance adaptation  

Microsoft Academic Search

Several field-oriented induction motor drive methods without rotational transducers have been proposed. These methods have a disadvantage that the rotor resistance variation causes an estimation error of the motor speed. Therefore, simultaneous estimation of the motor speed and the rotor resistance is required. This paper presents a method of estimating simultaneously the motor speed and the rotor resistance of an

Hisao Kubota; Kouki Matsuse

1994-01-01

99

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

100

Load Effects of Nola-Type Induction Motor Power-Factor Controllers on Fuel-Cell Inverters.  

National Technical Information Service (NTIS)

This report covers tests performed on power inverters using Nola-type power factor controllers (PFC) and fractional horsepower single-phase induction motors as loading devices. The inverters were designed for integral operation with fuel cell power plants...

1982-01-01

101

Speed control of wound rotor induction motors by AC regulator based optimum voltage control  

Microsoft Academic Search

Wound-rotor induction motors are generally used for high torque and adjustable speed conditions. At lower speeds, either power is wasted in rotor resistances or power is pumped back from the rotor circuit to grid using different standard energy recovery methods. At low torque and low speed conditions, the power wastage in the rotor circuit becomes enormously high. Furthermore, if stator

M. S. Jamil Asghar; Haroon Ashfaq

2003-01-01

102

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

DOEpatents

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

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

1984-01-01

103

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

104

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

NASA Astrophysics Data System (ADS)

In this paper, sensorless control for synchronous reluctance motors (SynRMs) without signal injection and an inductance measurement for position estimation are proposed. In the case of SynRMs, accuracy of inductances is the most important thing to realize precise position estimation because inductances are largely varied by a magnetic saturation phenomenon. Therefore, the inductance measurement method, which can measure appropriate inductances for position estimation, is important as well as a sensorless control method. The inductance measurement based on the observer is discussed, and the measurement method and the parameter adjustment method for improvement in stability of the closed loop are proposed. The proposed method can measure inductances easily and be applied for permanent magnet synchronous motors, too. Finally, the proposed sensorless control method is verified by experiments.

Ichikawa, Shinji; Tomita, Mutuwo; Doki, Shinji; Okuma, Shigeru

105

Nonlinear control of induction motors: Torque tracking with unknown load disturbance  

NASA Astrophysics Data System (ADS)

In a recent note Ortega and Espinosa presented a globally stable controller for torque regulation of a complete induction motor model with partial state feedback, i.e., no assumption of flux measurements. In the present contributions we extend these results in several directions. First, by 'adding mechanical damping' to the closed-loop systems relax the upper bound condition on the desired torque. Second, we use a new controller structure that allows us to treat the case of time-varying desired torque. Finally, a new estimator is proposed to handle time-varying (linearly parametrized) unknown loads.

Ortega, Romeo; Canudas, Carlos; Seleme, Seleme I.

1993-11-01

106

A Variable Frequency Inverter for AC Induction Motors with Torque, Speed and Braking Control.  

National Technical Information Service (NTIS)

A variable frequency inverter is described 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 o...

F. J. Nola

1973-01-01

107

Fuzzy Logic Speed Control of D.C. Motors Fed by Single-Ended Primary Inductance Converters (SEPIC)  

Microsoft Academic Search

The paper presents a closed loop speed control of a separately excited D.C. motor. The D.C. motor is fed from an A.C. supply through a cascade combination of a diode bridge rectifier and a single-ended primary inductance converter (SEPIC). This converter offers both step-up and step-down characteristics of the motor terminal voltage as well as an approximately sinusoidal supply current

M. M. R. Ahmed; G. A. Putrus

2006-01-01

108

A sliding mode controller based DTC of 3 level NPC inverter fed induction motor employing space vector modulation technique  

Microsoft Academic Search

This paper presents the space vector modulation (SVM) based direct torque control (DTC) of induction motor fed by a three level neutral point clamped (NPC) inverter. The SVM DTC system avoids the use of the hysteresis controllers and the look up table which are usually used in the classical DTC scheme. A novel sliding mode controller (SMC) is proposed which

Thalakola Vamsee Kiran; Jinka Amarnath

2012-01-01

109

DSP-based speed adaptive flux observer of induction motor  

Microsoft Academic Search

A method of estimating the speed of an induction motor is presented. This method is based on the adaptive control theory. Experimental results of a direct field oriented induction motor control without speed sensors are presented

Hisao Kubota; Kouki Matsuse; Takayoshi Nakano

1991-01-01

110

Elimination of saturation effects in sensorless position-controlled induction motors  

Microsoft Academic Search

Owing to the variable magnetic coupling between the stator windings and the discrete rotor bars of an induction motor, a quasicontinuous rotor position signal can be acquired by instantaneous measurement of the total leakage inductance of the three stator phases. The signals are sampled in synchronism with the regular commutations of the pulsewidth-modulation process, thus making the injection of additional

Joachim Holtz; Hangwen Pan

2004-01-01

111

EMF Feedback Control Strategy of Induction Motor for Wide Speed Range  

Microsoft Academic Search

Variation of winding resistance, magnetic saturation and iron loss in the induction motor result in field angle estimation error, which causes detuning problems. Especially, in cases when the iron loss and change of inductance cannot be neglected, ordinary resistance identification methods may lead to incorrect results. To solve this problem, a new method to directly revise the observed field position

Haifeng Lu; Wenlong Qu; Xiaomeng Cheng; Yang Fan; Xing Zhang

2007-01-01

112

Decoupling Control of Secondary Flux and Secondary Current in Induction Motor Drive with Controlled Voltage Source and Its Comparison with Volts\\/Hertz Control  

Microsoft Academic Search

A concept of decoupling control in the strategy of the speed regulation of the squirrel cage induction motor with controlled voltage source is represented. The decoupling control intends to cancel out the cross terms between the secondary flux and the secondary current. Three necessary and sufficient conditions for the decoupling control are offered that correspond to taking into account the

Kouhei Ohnishi; Hideo Suzuki; Kunio Miyachi; Masayuki Terashima

1985-01-01

113

Suppression of saturation saliency effects for the sensorless position control of induction motor drives under loaded conditions  

Microsoft Academic Search

This paper presents an automated commissioning procedure used for the elimination of the saturation saliency effects in the sensorless position control of field-orientated cage induction motor drives. The position control itself is based on extracting a rotor position estimate from a high-frequency signal injection interacting with natural or engineered rotor position saliencies within the machine. The paper shows that this

Nikolas Teske; Greg M. Asher; Mark Sumner; Keith J. Bradley

2000-01-01

114

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

115

Fuzzy Self-Tuning Speed Control of an Indirect Field-Oriented Control Induction Motor Drive  

Microsoft Academic Search

The field-oriented control of induction machines is widely used in high-performance applications. However, detuning caused by parameter disturbances still limits the performance of these drives. In order to accomplish variable-speed operation, conventional PID-like controllers are commonly used. These controllers provide limited good performance over a wide range of operation, even under ideal field-oriented conditions. An alternate approach is to use

Mavungu Masiala; Behzad Vafakhah; John Salmon; Andrew M. Knight

2008-01-01

116

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

SciTech Connect

This paper contains an analysis of how the choice of energy optimal control of induction motors is influenced by motor construction, 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 throughout the paper, but through statistics on the use of motors and their efficiencies, the conclusions are widened to a broader range (0--50 kW). Energy optimal control strategies are reviewed and cos({phi}) control, a model-based control, and a search control are implemented in the laboratory in a vector and a scalar motor drive. The convergence speed for the strategies and their ability to reject disturbances are investigated by experiments. It is also shown experimentally that, for both standard and high-efficiency motors, motor energy-efficiency improvement is achievable by energy optimal control below 60% load torque. The energy savings using energy optimal control strategies are measured on a pump system with a certain load cycle. Model-based control is recommended for CT applications and cos({phi}) control for HVAC applications.

Abrahamsen, F.; Blaabjerg, F.; Pedersen, J.K. [Aalborg Univ. (Denmark). Inst. of Energy Technology] [Aalborg Univ. (Denmark). Inst. of Energy Technology; Grabowski, P.Z. [Warsaw Univ. of Technology (Poland). Inst. of Control and Industrial Electronics] [Warsaw Univ. of Technology (Poland). Inst. of Control and Industrial Electronics; Thoegersen, P. [Danfoss Drives A/S, Graasten (Denmark). Transmission Div.] [Danfoss Drives A/S, Graasten (Denmark). Transmission Div.

1998-07-01

117

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

118

Real-Time Speed and Flux Adaptive Control of Induction Motors Using Unknown Time-Varying Rotor Resistance and Load Torque  

Microsoft Academic Search

In this paper, an algorithm for direct speed and flux adaptive control of induction motors using unknown time-varying rotor resistance and load torque is described and validated with experimental results. This method is based on the variable structure theories and is potentially useful for adjusting online the induction motor controller unknown parameters (load torque and rotor resistance). The presented nonlinear

G. Kenne; Tarek Ahmed-Ali; Francoise Lamnabhi-Lagarrigue; A. Arzande

2009-01-01

119

Steady-State Characteristics of a Torque and Speed Control System of an Induction Motor Utilizing Rotor Slot Harmonics for Slip Frequency Sensing  

Microsoft Academic Search

A method is proposed to detect the slip frequency of a three phase squirrel-cage induction motor from rotor slot harmonics. A method of torque and speed control of the induction motor using the proposed slip frequency detector is presented. The torque and speed control system is realized considering characteristics of the slip frequency detector. Experimental results show that the proposed

Muneaki Ishida; Koji Iwata

1987-01-01

120

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

Microsoft Academic Search

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

Joachim Holtz; Juntao Quan

2002-01-01

121

A new induction motor V\\/f control method capable of high-performance regulation at low speeds  

Microsoft Academic Search

A novel open-loop speed control method for induction motors that provides high output torque and nearly zero steady-state speed error at any frequency is presented. The control scheme is based on the popular constant volts per hertz (V\\/f) method using low-cost open-loop current sensors. Only stator current measurements are needed to compensate for both stator resistance drop and slip frequency.

A. Munoz-Garcia; Thomas A. Lipo; Donald W. Novotny

1998-01-01

122

DTC control schemes for induction motor fed by three-level NPC-VSI using Space Vector Modulation  

Microsoft Academic Search

Switching Table based Direct Torque Control (ST-DTC) appears as a promising control technique to be applied to power converters in the industry. However, the ST-DTC presents some drawbacks as non constant switching frequency and high torque ripples. This work proposes a DTC schemes for an induction motor fed by three-level voltage source inverter (VSI), neutral point clamped topology (NPC), with

R. Zaimeddine; T. Undeland

2010-01-01

123

Artificial intelligence-based speed control of DTC induction motor drives—A comparative study  

Microsoft Academic Search

The design of the speed controller greatly affects the performance of an electric drive. A common strategy to control an induction machine is to use direct torque control combined with a PI speed controller. These schemes require proper and continuous tuning and therefore adaptive controllers are proposed to replace conventional PI controllers to improve the drive's performance. This paper presents

S. M. Gadoue; D. Giaouris; J. W. Finch

2009-01-01

124

Speed Control and a Full-Order State Observer for Efficiency Optimized Induction Motor  

Microsoft Academic Search

To improve the efficiency of an induction motor (IM), an algorithm has been developed in terms of slip frequency. A discrete-time multi-input and multi-output (MIMO) optimal regulator is proposed to achieve the desired speed with efficiency optimization. Furthermore, a full-order observer is proposed to estimate rotor flux and magnetizing current because these states of IM are feedback to design the

Mohammad Abdul Mannan; Toshiaki Murata; Junji Tamura; Takeshi Tsuchiya

2005-01-01

125

An 18Pulse AC-DC Converter for Power Quality Improvement in Vector Controlled Induction Motor Drives  

Microsoft Academic Search

This paper deals with a novel autotransformer based improved power quality eighteen-pulse ac-dc converter feeding vector controlled induction motor drives (VCIMD's). The design of the proposed autotransformer is presented along with the necessary modifications required for making it suitable for retrofit applications, where presently a 6-pulse diode bridge rectifier is used. The proposed ac-dc converter is found capable of improving

Bhim Singh; G. Bhuvaneswari; Vipin Garg

2006-01-01

126

Power-quality improvements in vector-controlled induction motor drive employing pulse multiplication in AC-DC converters  

Microsoft Academic Search

This paper deals with the pulse doubling in a 12-pulse ac-dc converter for improving power quality in vector-controlled induction motor drives (VCIMDs). The design of proposed magnetics shows the flexibility in varying the voltage ratio of the autotransformer for making it suitable for retrofit applications, where presently a six-pulse diode bridge rectifier is being used. The proposed ac-dc converter is

Bhim Singh; G. Bhuvaneswari; Vipin Garg

2006-01-01

127

Application of pulse multiplication in autotransformer based AC-DC converters for direct torque control induction motor drives  

Microsoft Academic Search

Power quality improvement has been achieved using a 24 pulse autotransformer based ac-dc converter. The idea is to use an autotransformer based 12-pulse ac-dc converter and incorporating pulse doubling method for improving power quality ac mains for feeding a direct torque controlled induction motor drive (DTCIMD) load. The scheme uses a star connected autotransformer to produce 12-pulses with flexibility to

S. Nakhaee; A. Jalilian

2010-01-01

128

Polygon-Connected Autotransformer-Based 24Pulse AC–DC Converter for Vector-Controlled Induction-Motor Drives  

Microsoft Academic Search

This paper presents a novel autotransformer-based 24-pulse AC-DC converter feeding vector-controlled induction motor drives (VCIMDs) for improving power quality at the point of common coupling. The DC-ripple-reinjection technique is used in achieving the pulse multiplication in a 12-pulse AC-DC converter. The design of the proposed autotransformer is given, and necessary modifications are made in it to provide the same output

Bhim Singh; Vipin Garg; G. Bhuvaneswari

2008-01-01

129

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

Microsoft Academic Search

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

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

2006-01-01

130

Direct torque control of induction motor: Simulation results using two-level and diode clamped multilevel inverter  

Microsoft Academic Search

Development in multilevel converters has provided better option as power converter for high-power applications. These converters synthesize the output voltage waveform from several steps of dc input source which approaches to sinusoidal waveform and minimizes the harmonic distortions. This paper presents the application of two-level inverter and diode clamped multilevel inverter for direct torque control of 3-phase induction motor drive.

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

2010-01-01

131

Optimization of Delayed-State Kalman-Filter-Based Algorithm via Differential Evolution for Sensorless Control of Induction Motors  

Microsoft Academic Search

This paper proposes the employment of the differential evolution (DE) to offline optimize the covariance matrices of a new reduced delayed-state Kalman-filter (DSKF)-based algorithm which estimates the stator-flux linkage components, in the stationary reference frame, to realize sensorless control of induction motors (IMs). The DSKF-based algorithm uses the derivatives of the stator-flux components as mathematical model and the stator-voltage equations

Nadia Salvatore; Andrea Caponio; Ferrante Neri; Silvio Stasi; Giuseppe Leonardo Cascella

2010-01-01

132

Representation of directly connected and drive-controlled induction motors. Part 1: Single-phase load models  

Microsoft Academic Search

This paper is part one of a two part series, which discusses steady state load models of directly connected and drive-controlled single-phase and three-phase induction motors. The presented analysis compares changes in their active and non-active power demand characteristics with the variations in supply system voltage and mechanical loading conditions. From the presented analysis, analytical expressions and equivalent load models

Charles Cresswell; S. Djokic

2008-01-01

133

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

NASA Astrophysics Data System (ADS)

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

1982-12-01

134

Development of Single Phase Induction Motor Adjustable Speed Control Using M68HC11E-9 Microcontroller  

Microsoft Academic Search

This study investigates the performance of single-phase induction motor using microcontroller M68HC11E-9. The microcontroller senses the speed's feedback signal and consequently provides the pulse width variation signal that sets the gate voltage of the chopper, which in turn provides the required voltage for the desired speed. A Buck chopper has been used to control the input voltage of a fully

Senan M. Bashi; I. Aris; S. H. Hamad

2005-01-01

135

FPGA implementation of space vector PWM for speed control of 3-phase induction motor  

Microsoft Academic Search

Advancements in solid state and Programmable Logic Devices have given a tremendous support to digital control techniques for speed control of motors. Space Vector PWM (SVPWM) is a sophisticated technique for generating a sine wave that provides a higher source voltage utilization and lower total harmonic distortion. Also, it is inherently suitable for digital implementation of vector control (Field Oriented

Aishanou Osha Rait; Praveen Bhosale

2011-01-01

136

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

137

Modified internal model control of induction motor variable frequency speed control system in v\\/f mode based on neural network generalized inverse  

Microsoft Academic Search

In order to improve the robustness and anti-interference ability of induction motor variable frequency speed control system (IMVFSCS), a modified internal model control (MIMC) method based on neural network generalized inverse (NNGI) was proposed. On the basis of reversibility analysis of original system, the generalized inverse model approximated by the dynamical BP neural network was cascaded with the original system.

Guohai Liu; Xiao Xiao; Chenglong Teng; Guanxue Yang; Yan Jiang; Yue Shen

2010-01-01

138

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

139

Implementing field oriented control of a voltage fed current regulated induction motor on a single transputer  

Microsoft Academic Search

Field oriented control (FOC) ensures high performance induction machine control. In particular, the indirect method of FOC is the most practical scheme since it does not require the measurement of magnetic fluxes within the machine, and consequently standard machines may be used. A typical FOC system contains high bandwidth current control loops which require fast and complex signal processing which

G. Diana; B. Hao; R. G. Harley; D. R. Woodward; D. C. Levy

1994-01-01

140

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

141

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

142

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

143

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

NASA Astrophysics Data System (ADS)

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

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

144

Steady state performance evaluation of saturated field oriented induction motors  

Microsoft Academic Search

Steady-state performance characteristics of the stator field oriented control, air-gap field oriented control and rotor field oriented control induction motor drives are compared. Effects of the magnetizing flux saturation on the magnetizing inductance and conductor temperature on the rotor resistance are rigorously included in the performance equations. Key performance indices, such as relative flux level, torque, motor efficiency, and input

Olorunfemi Ojo; Madhani Vipin

1990-01-01

145

Analysis and comparison of PM synchronous motor and induction motor type magnetic bearings  

Microsoft Academic Search

In this paper, a general solution of radial position control applicable to PM synchronous type and induction type rotating motors is presented. The rotor of the permanent magnet motor is assumed to have sinusoidally distributed magnetic poles along the axial surface, while the rotor of the induction type motor is assumed to have uniform magnetic property. The inner wall of

Yohji Okada; Kazutada Dejima; Tetsuo Ohishi

1995-01-01

146

Microprocessor-Controlled AC-Servo Drives with Synchronous or Induction Motors: Which is Preferable?  

Microsoft Academic Search

With the recent advances of power transistors and microprocessors it has become possible to design high-dynamic-performance ac-servo drives free of moving contacts using synchronous or asynchronous motors. Both schemes have their particular strengths. A general control principle, based on field or rotor orientation, is described which has been realized with a state-of-the-art microcomputer, where all the signal processing, including modulation

R. Lessmeier; W. Schumacher; W. Leonhard

1986-01-01

147

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

Microsoft Academic Search

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

Thomas A. Lipo; Loren H. Walker

1983-01-01

148

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

149

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

Microsoft Academic Search

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

Antti Kosonen; Markku Jokinen; Jero Ahola; Markku Niemelä

2006-01-01

150

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

151

Stability Analysis Methods for Digital Vector Control System of Induction Motor  

NASA Astrophysics Data System (ADS)

To perform the vector control, relatively complicated control algorythm is required. The digital sampling control system is apt to be unstable dependent on its sampling period. To equip with many functions under the limitation of lower cost, the longer sampling period is inevitable and the performance of the system becomes less stable. Therefore it is important to evaluate the permissible maximum sampling period of each system. To evaluate it, software simulation tools such as PSIM and EMTP can be used. However these tools require a long execution time even for the sole model under each circuit condition. Therefore simpler methods are necessary to investigate the stability rapidly for many cases of the circuit conditions. In this paper, we propose three kinds of stability judging methods using root loci in a z-plane. The first metod is the most practical one based on a simple approximated model. The second and third methods are based on detailed models each having continuously rotating axis and stepwise rotating axis of the motor coordinates. To evaluate the proposed analytical methods, these results are compared with those obtained from detailed simulation taking PWM control into account.

Tsuji, Mineo; Tsuboi, Katsutaka; Yamada, Eiji

152

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

153

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 ...

154

Fine motor control  

MedlinePLUS

... general) motor control. An example of gross motor control is waving an arm in greeting. Problems of the brain, spinal cord, peripheral nerves, muscles, or joints may all decrease fine motor control. The difficulty in speaking, eating, and writing in ...

155

Development of a slip and slide simulator for electric locomotive based on inverter-controlled induction motor  

Microsoft Academic Search

In this paper, a slip and slide simulator is proposed to simulate the dynamic behavior of the electric locomotive. The simulator consists of two inverter-controlled AC motors directly coupled with each other. One motor plays a role of traction motor of electric locomotive, other one is to use to simulate various driving characteristics of railway vehicle including adhesive characteristics, running

Kekang Wei; Jia Zhao; Xiaojie You; Trillion Q. Zheng

2009-01-01

156

Linear Induction Motor Research. Volume I. Introduction and Background.  

National Technical Information Service (NTIS)

A 2500-hp linear induction motor (LIM), a complete test vehicle, a propulsion control system, test instrumentation, and an onboard auxiliary power supply have been designed, fabricated, and checked out. The system was designed to operate at test speeds up...

J. Dannan G. O. D'Sena

1971-01-01

157

Linear Induction Motors and Devices: A Review.  

National Technical Information Service (NTIS)

The objectives of this study were to acquire, generate, transmit and apply knowledge and expertise in the field of Linear Induction Motors and devices. The report is in three parts. The history of development of linear induction motors and various applica...

C. S. Jha R. Arockiasamy V. N. Sharma

1980-01-01

158

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

159

Linear Induction Motor Research: Linear Induction Motor and Test Vehicle Design and Fabrication. Volume II, Book 2.  

National Technical Information Service (NTIS)

A 2500-hp linear induction motor (LIM), a complete test vehicle, a propulsion control system, test instrumentation, and an onboard auxiliary power supply have been designed, fabricated, and checked out. The system was designed to operate at test speeds up...

1971-01-01

160

Linear Induction Motor Research: Linear Induction Motor and Test Vehicle Design and Fabrication. Volume II, Book 1.  

National Technical Information Service (NTIS)

A 2500-hp linear induction motor (LIM), a complete test vehicle, a propulsion control system, test instrumentation, and an onboard auxiliary power supply have been designed, fabricated, and checked out. The system was designed to operate at test speeds up...

1971-01-01

161

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.

162

Sensorless position detection for vector controlled induction motor drives using an asymmetric outer-section cage  

Microsoft Academic Search

This paper describes a new method of obtaining a rotor position signal from a cage induction machine operating without a mechanical sensor. The method is based on introducing a circumferential variation in the resistance of the outer section of either a double cage or deep bar cage rotor. Simulation results for a linear double cage machine show that the method

J. Cilia; G. M. Asher; K. J. Bradley

1996-01-01

163

A control strategy for induction motors fed from single phase supply  

Microsoft Academic Search

It is often required that a three-phased asynchronous motor can run at variable speed, which makes it necessary to use a three-phase inverter driven from a DC-source. Today, most inverters are driven from the network using a simple diode bridge and an electrolytic capacitor. The problem with the simple diode bridge and the electrolytic capacitor is that current is only

L. Sondergaard

1993-01-01

164

Linear Motor Controller.  

National Technical Information Service (NTIS)

The controller interfaces up to two linear motors to either a manual control panel or a two channel computer. The control commands can emanate from either the computer (for both motors) or a combination of the computer (for one motor) and the linear motor...

R. D. Mohlere

1981-01-01

165

Design and Characteristics of a Rotor Flux Controlled High Speed Induction Motor Drive Applying Two-Level and Three-Level NPC Voltage Source Converters  

Microsoft Academic Search

This paper describes the field oriented control of a high speed induction motor (HSIM) and the design of a two-level voltage source converter (2L-VSC) and a three-level neutral point clamped voltage source converter (3L-NPC VSC) for a 420 V low voltage high speed drive. The proposed control system and both converters are simulated to determine the drive performance under two

Kamran Jalili; Dietmar Krug; Steffen Bernet; Mariusz Malinowski; Braz J. Cardoso Filho

2005-01-01

166

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

167

Transistorized PWM inverter-induction motor drive system  

NASA Astrophysics Data System (ADS)

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

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

1982-10-01

168

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

SciTech Connect

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

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

1992-01-01

169

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

Microsoft Academic Search

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

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

2007-01-01

170

Linear Induction Motor Electrical Braking Test.  

National Technical Information Service (NTIS)

This report describes the electrical braking characteristics of a 2500-hp (at 250 mph) linear induction motor (LIM), which is used to propel and brake the LIM research vehicle. Three methods of electrical braking were investigated: ac dynamic braking, dc ...

R. B. Powell

1976-01-01

171

Comparison of capabilities of reluctance synchronous motor and induction motor  

NASA Astrophysics Data System (ADS)

This paper compares the capabilities of a reluctance synchronous motor (RSM) with those of an induction motor (IM). An RSM and IM were designed and made, with the same rated power and speed. They differ only in the rotor portion while their stators, housings and cooling systems are identical. The capabilities of both motors in a variable speed drive are evaluated by comparison of the results obtained by magnetically nonlinear models and by measurements.

Štumberger, Gorazd; Hadžiselimovi?, Miralem; Štumberger, Bojan; Miljavec, Damijan; Dolinar, Drago; Zagradišnik, Ivan

2006-09-01

172

Vector-controlled induction motor drive with a self-commissioning scheme  

Microsoft Academic Search

Different vector-controlled structures are discussed, and their suitability for an economical and reliable industrial drive system is explored. From this, the design of a compact control hardware is derived, composed of an 80196 microcontroller and an ASIC (application-specific integrated circuit) for the generation of the pulsewidth modulation (PWM) signals. The drive system can be configured from a host computer or

Ashwin M. Khambadkone; Joachim Holtz

1991-01-01

173

Inrush current and speed regulation of induction motor drives  

Microsoft Academic Search

A linear suboptimal control technique is presented which is applied to a voltage source induction motor drive. The main functions of the controller are to counteract external disturbances and to reduce the magnitude of the inrush current during frequency and voltage perturbations and load fluctuations. It is also designed for speed control and regulation with time. Controller inputs are directly

MOHAHED AKHERRAZ

1991-01-01

174

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

175

The history of induction motors in America  

Microsoft Academic Search

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

P. L. Alger; R. E. Arnold

1976-01-01

176

Dual-inverter control strategy for high-speed operation of EV induction motors  

Microsoft Academic Search

An integrated starter\\/alternator (ISA) is normally designed to have high pole structure (10-14 poles) for high starting torque. However, its back electromotive force (EMF) at the peak revolutions per minute should be less than its battery voltage for the power flow control. For example, the back-EMF of a 12-pole ISA should be 42 V at 6000 r\\/min. These types of

Junha Kim; Jinhwan Jung; Kwanghee Nam

2004-01-01

177

Comparison of Linear Induction Motor Theories for the LIMRV and TLRV Motors.  

National Technical Information Service (NTIS)

The Oberretl, Yamamura, and Mosebach theories of the linear induction motor are described and also applied to predict performance characteristics of the TLRV & LIMRV linear induction motors. The effect of finite motor width and length on performance predi...

J. J. Stickler

1978-01-01

178

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

179

Pulsed linear induction motor concept for high-speed trains.  

National Technical Information Service (NTIS)

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 conventiona...

B. N. Turman B. M. Marder G. J. Rohwein D. P. Aeschliman J. B. Kelley

1995-01-01

180

Linear Induction Motor Electrical Performance Test.  

National Technical Information Service (NTIS)

This report describes the electrical performance characteristics of a 2500-hp (at 250 mph) linear induction motor (LIM), based on data acquired while propelling the LIM research vehicle over a 0-to-250-mph speed range. Pertinent LIM design information is ...

R. B. Powell

1976-01-01

181

Non-conventional supplying system for induction traction motors from Diesel locomotives  

Microsoft Academic Search

The evolution of the power electronic devices (with proper control strategies) enables the replacement of the DC traction motor with the more advantageous induction motor in railway application. The AC traction motors ask for expensive, intricate inverters with semiconductors working under high electric stress. For the Diesel-electric locomotives, the authors propose an original non-conventional supplying system for AC motor with

M. Huzau; R. Both; E. H. Dulf; V. Tulbure

2010-01-01

182

PWM-CSI inverter for induction motor drives  

Microsoft Academic Search

The authors discuss a number of issues involved in designing a current source inverter system for a large induction motor drive. Using two modulation techniques-selected harmonic elimination in the upper frequency range and trapezoidal modulation in the lower frequency range-control of voltage, current, and torque harmonics is achieved while limiting the GTO switching frequency to 180 Hz. Each modulation range

Bin Wu; Shashi B. Dewan; Gordon R. Slemon

1992-01-01

183

Observers for induction motor state and parameter estimation  

Microsoft Academic Search

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

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

1991-01-01

184

The dynamic braking of induction motors  

NASA Astrophysics Data System (ADS)

The dynamic braking of induction motors is investigated with particular emphasis on the use of zero-sequence connections. The braking performance using both ac and dc supplies is compared. A mathematical model is developed to predict both the transient and steady-state zero-sequence braking performance. To ensure accurate calculations, a model is constructed to allow for the variation of secondary parameters with frequency due to the skin effect. A method for determining the zero-sequence parameters using locked rotor variable frequency data is presented. To measure the transient acceleration torque of the machine, a rotational accelerometer is developed from a small single-phase induction motor. Good correlation between measured and calculated results is achieved during switching transients for both current and torque.

Hickman, B.

1985-03-01

185

Motor control for a brushless DC motor  

NASA Technical Reports Server (NTRS)

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

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

1985-01-01

186

Transient Voltage Protection for Induction Motors Including Electrical Submersible Pumps  

Microsoft Academic Search

Because it is not practical to build as much insulation into rotating equipment, induction motors are more susceptible to damage from lightning and system-induced surges than is stationary equipment. This is, unfortunately, true of submersible pump drive motors, where dimensional constraints further limit the amount of insulation that may be designed into the motor. The transient phenomena to which induction

Steve M. Dillard; Thomas D. Greiner

1987-01-01

187

Induction Motor Tradeoff for VSD Driven Pumps and Fans  

Microsoft Academic Search

In this paper a new approach in overall drive system choice for centrifugal applications is proposed. This approach lies in tradeoff between number of induction motor poles and overall system efficiency and investment. The proposed technique of induction motor and proper drive selection based on theoretical proof that high nominal speed motor have better efficiency at any operated speed that

T. Nickolayevsky; S. Singer

2006-01-01

188

Inverter-Induction Motor Drive for Transit Cars  

Microsoft Academic Search

The advent of large power semiconductors has made it possible to apply inverters and ac motors to traction applications. Either synchronous or induction motors and several types of power converters can be considered. The induction motor and the pulsewidth modulated (PWM) inverter are selected as favorable for application to a transit car drive. A general method of sizing the PWM

A. B. Plunkett; D. L. Plette

1977-01-01

189

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

190

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

191

Induction Motor Drive System using V-connection AC Chopper  

NASA Astrophysics Data System (ADS)

This paper proposes a novel induction motor drive system using a three-phase V-connection ac chopper that consists of two single-phase ac choppers. There are three new topics proposed in this paper. Firstly, this paper proves that the three-phase V-connection ac chopper can be operated properly only if the input and the output voltages are in synchronism . Secondly, a novel commutation method for ac chopper isproposed. The proposed commutation method combines the load current commutation and the input voltage commutation. Therefore, by applying the proposed commutation method, voltage and current surge around zero crossing of the input voltage and the load current do not occur. Thirdly, a novel high effciency control method for induction motor is proposed. The proposed control method does not require d-axis and q-axis current components, but uses only the magnitude ofthe primary current. The whole control system has a very simple structure. These new topics are confirmed by experimental results on a 750W general-purpose induction motor.

Ito, Jun-Ichi; Tajima, Hirokazu; Ohsawa, Hiroshi

192

Sensorless position detection for vector-controlled induction motor drives using an asymmetric outer-section cage  

Microsoft Academic Search

This paper describes a new method of obtaining a rotor position signal from a cage induction machine operating without a mechanical sensor. The method is based on introducing a circumferential variation in the resistance of a high-resistance outer-section cage of an induction-machine rotor. Simulation results using a linear “double-cage” machine equivalent show that the method is feasible and provides incremental

Joseph Cilia; Greg M. Asher; Keith J. Bradley; Mark Sumner

1997-01-01

193

Linear Induction Motor Research: Data Acquisition, Data Analyses, and Low-Speed Testing. Volume III.  

National Technical Information Service (NTIS)

A 2500-hp linear induction motor (LIM), a complete test vehicle, a propulsion control system, test instrumentation, and an onboard auxiliary power supply have been designed, fabricated, and checked out. The system was designed to operate at test speeds up...

1971-01-01

194

Model Reference Adaptive System Against Rotor Resistance Variation in Induction Motor Drive  

Microsoft Academic Search

The paper deals with a compensation method of the rotor-resistance variation in induction motor drives using high-performance slip-frequency control. Our proposed method is based on a discrete-type model reference adaptive system (MRAS), and it is implemented in an 8086 microprocessor. When an induction motor is driven by a controlled current source, the system sensitivity to the rotor resistance variation is

Kouhei Ohnishi; Youzou Ueda; Kunio Miyachi

1986-01-01

195

Optimal Operation of Induction Motors Based on Multi-Objective Particle Swarm Optimization (MOPSO)  

Microsoft Academic Search

This paper presents an optimization controller for three-phase induction motor. In this controller, Multi Objective Particle Swarm Optimization MOPSO is implemented to tackle all the conflicting goals that define the problem. This paper deals with two conflicting objective functions. These conflicting functions are: 1. Maximize the efficiency of the drive system, and 2. Maximize the power factor of the induction

R. H. A. Hamid; A. M. A. Amin; Refaat S. Ahmed; Adel A. A. El-Gammal

2007-01-01

196

Dual-Source Fed Multi-phase Induction Motor Drive for Fuel Cell Vehicles: Topology and Control  

Microsoft Academic Search

The paper introduces a new multi-source fed drive topology based on a multi-phase induction machine. The reference application is the hybrid fuel cell (FC) traction system (fuel cell and battery). The FC power and the battery power are directly added at the machine level, without any additional DC-DC converters. The proposed drive topology uses two three-phase inverters having different DC

R. Bojoi; A. Tenconi; F. Farina; F. Profumo

2005-01-01

197

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

SciTech Connect

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

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

1987-05-01

198

Synchronous Motor Railcar Propulsion  

Microsoft Academic Search

Development of ac motor drives for rail transit car has centered on the induction motor with pulsewidth modulated (PWM) inverter control. Interest in the induction motor as a replace for the series dc traction motor stems from the simplicity of the squirrel cage rotor of the induction motor. In this article, the short-comings of PWM inverter-induction motor transit car drive

Frank J. Bourbeau

1977-01-01

199

Modelling and Analysis of Dual-Stator Induction Motors  

NASA Astrophysics Data System (ADS)

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

Razik, Hubert; Rezzoug, Abderrezak; Hadiouche, Djafar

200

Power Factor Correction of Single-Phase Induction Motor Using Magnetic Energy Recovery Switch  

NASA Astrophysics Data System (ADS)

Magnetic energy recovery switch (MERS) has a function of automatic power factor correction of series connected load. The MERS is applied for a single-phase induction motor to improve the power factor. Two control methods of the MERS for power factor correction are described in this paper. Experiments were carried out and confirmed that the input power factor of a single-phase induction motor is improved.

Takaku, Taku; Narushima, Jun; Isobe, Takanori; Kitahara, Tadayuki; Shimada, Ryuichi

201

Traction system for an EV based on induction motor and 3-level NPC inverter multilevel converters  

Microsoft Academic Search

This work presents the modeling of the dynamics of an electric vehicle (EV). Then, by using a typical driving cycle, the parameters for the motor drive system and other drive train components are determined. The proposed drive system is based on an induction motor being supplied by a 3-level NPC inverter. The speed control is based on a constant V\\/Hz

M. A. Gonza?lez; M. F. Escalante

2010-01-01

202

Improvement of the efficiency of induction motors  

NASA Astrophysics Data System (ADS)

The electric motor as energy converter was studied for four groups of parameters: process, network, foundations, and environment. The feasibility of reducing the losses of asynchronous three phase motors with squirrel cage or with slip rings in the power output range from 100 to 1500kW, was investigated. Mechanical losses from the bearings, from air friction, and from fan electromagnetic losses in the iron and in the copper, and the most efficient way of heat elimination due to this losses effect of a nonsinusoidal energy source on losses use of electronic controlled energy sources where variable load and speed are necessary, were studied. It is proved that for the studied motor range a better conception of ventilation is very useful and that the most efficient losses reduction are achieved by optimizing the electromagnetic design and the insulation techniques. Thyristor-based voltage regulators can achieve remarkable energy savings especially in the field of elevator technique in the speed range up to 2m/sec and in hoisting equipment.

Falk, K.; Schoerner, J.

1982-07-01

203

An Induction Motor Based Wind Turbine Emulator  

NASA Astrophysics Data System (ADS)

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

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

2014-04-01

204

Advanced Motor and Motor Control Development.  

National Technical Information Service (NTIS)

The capability of operating a high-speed permanent-magnet brushless dc motor with electronic controller over a wide load and speed range was demonstrated. A centrifugal pump was used as the loading mechanism and hydraulic fluid was pumped in simulation of...

K. L. Wuertz E. D. Beauchamp

1988-01-01

205

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.

206

MRAS Sensorless Vector Control of an Induction Motor Using New Sliding-Mode and Fuzzy-Logic Adaptation Mechanisms  

Microsoft Academic Search

In this paper, two novel adaptation schemes are proposed to replace the classical PI controller used in model reference adaptive speed-estimation schemes that are based on rotor flux. The first proposed adaptation scheme is based on sliding-mode theory. A new speed-estimation adaptation law is derived using Lyapunov theory to ensure estimation stability, as well as fast error dynamics. The other

Shady M. Gadoue; Damian Giaouris; John W. Finch

2010-01-01

207

MATE Module 10: Control Systems: Motor Control  

NSDL National Science Digital Library

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

2013-07-05

208

Improvement of the Efficiency of Induction Motors.  

National Technical Information Service (NTIS)

The electric motor as energy converter was studied for four groups of parameters: process, network, foundations, and environment. The feasibility of reducing the losses of asynchronous three phase motors with squirrel cage or with slip rings in the power ...

K. Falk J. Schoerner

1982-01-01

209

Performance Analysis of Saturated Induction Motors by Virtual Tests  

ERIC Educational Resources Information Center

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

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

2012-01-01

210

Analysis of faulted induction motor fed with PWM inverter  

Microsoft Academic Search

The performance analysis of a faulted induction motor fed with a natural sampled pulse-width modulation (PWM) inverter is presented. Faults in both delta and star connections of the stator windings considered include open phase and backward phase connections. The influence of the zero-sequence current on the motor performance is taken into consideration. The average and pulsating torque components and the

Olorunfemi Ojo; Ishwar Bhat

1992-01-01

211

A multiaxle AC induction motor drive with current source inverter  

Microsoft Academic Search

Electric traction vehicles usually employ two or more axles to transmit the drive torque to the wheels. Several ac squirrel cage induction motors driven in parallel from a common inverter produce poor torque sharing and large motor derating even for very small (less than one percent) differences in the diameters of the wheel sets attached to different axles of the

S. Dewan; A. Joshi; G. Slemon

1979-01-01

212

Energy Saving Electrical Motor Control System.  

National Technical Information Service (NTIS)

An energy saving system in AC electrical motors which provides optimum control of the rriac control voltage supplied to different motors with which the system is used, despite the different characteristics of such motors is described. A three phase motor,...

T. M. Edge

1982-01-01

213

Variable speed induction motor operation from a 20-kHz power bus  

NASA Technical Reports Server (NTRS)

Induction motors are recognized for their simple rugged construction. To date, however, their application to variable speed or servo drives was hampered by limitations on their control. Induction motor drives tend to be complex and to display troublesome low speed characteristics due in part to nonsinusoidal driving voltages. A technique was developed which involves direct synthesis of sinusoidal driving voltages from a high frequency power bus and independent control of frequency and voltages. Separation of frequency and voltage allows independent control of rotor and stator flux, full four quadrant operation, and instantaneous torque control. Recent test results, current status of the technology, and proposed aerospace applications will be discussed.

Hansen, Irving G.

1989-01-01

214

Soft Computing Application in Fault Detection of Induction Motor  

SciTech Connect

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

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

2010-10-26

215

Improved Transistorized AC Motor Controller for Battery Powered Urban Electric Passenger Vehicles.  

National Technical Information Service (NTIS)

The objectives of this program for an improved ac motor controller for battery powered urban electric passenger vehicles were: the design, fabrication, test, evaluation and cost analysis of an engineering model controller for an ac induction motor drive s...

S. C. Peak

1982-01-01

216

Induction motor drive system for low-power applications  

Microsoft Academic Search

This paper investigates the utilization of three different configurations of induction motor drives to implement low-cost systems for low-power applications. The static power converter side is implemented by a single-phase rectifier cascaded with a four-switch inverter. Three different types of induction machines are supplied with the static power converter. In the first configuration, a standard three-phase induction machine is employed.

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

1999-01-01

217

Fault-Tolerant Operating Strategies Applied to Three-Phase Induction-Motor Drives  

Microsoft Academic Search

This paper presents a comparative analysis involving several fault-tolerant operating strategies, applied to three-phase induction-motor drives, that intend to compensate for inverter faults. The results presented show the advantages and the inconveniences of several fault-tolerant drive structures, under different control techniques, such as the field-oriented control and the direct torque control. Experimental results concerning the performance of the three-phase induction

André M. S. Mendes; A. J. Marques Cardoso

2006-01-01

218

Transient thermal analysis of induction motors  

Microsoft Academic Search

Induction machines transient thermal analysis has been a subject of interest for electric machine designers in their effort to improve machine reliability and in rotor design optimisation. The study of transient thermal behavior is useful to identify causes of failure in induction machines. This paper presents a 2-D transient analysis of induction machines using the available heat transfer coefficients in

M. S. Rajagopal; K. N. Seetharamu; P. A. Ashwathnarayana

1998-01-01

219

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

220

Identification of Plant Model of Linear Induction Motors for Traction System  

NASA Astrophysics Data System (ADS)

A linear induction motor (LIM) is suitable for use in trains; the motor can be used in both wheel-suspended and contact-less types such as Linear Metro and HSST trains in Japan. The LIM has the end winding as well as asymmetrical winding. The end-effect is a major problem in the LIM, and it makes the analysis, design, and control of motors difficult. In this paper, the combination method of numerical analysis and equivalent circuit of the LIM is described in order to design a high-performance controller of the LIM includeing the end effect. A sample basic field-oriented control scheme that is based on the plant model is applied to the LIM in order to check the control performance; the theory of rotary induction motor is used for the verification.

Nozaki, Yuichiro; Koseki, Takafumi

221

Vibration suppression of induction-motor-driven hybrid vehicle using wheel torque observer  

Microsoft Academic Search

The authors describe the vibration phenomenon occurring in indirect field-oriented control or vector control when induction motors drive inertia load through a spring under overload at high speed. The target system of this study is a hybrid vehicle consisting of a front engine-driven system and two rear motor-driven systems, which are designed to improve the driving stability. In this vehicle,

Katsuhiro Asano; Shigenobu Okada; N. Iwamam

1992-01-01

222

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

223

Torque control for electric motors  

NASA Technical Reports Server (NTRS)

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

Bernard, C. A.

1980-01-01

224

Harmonic analysis and performance improvement of slip energy recovery induction motor drives  

Microsoft Academic Search

Slip energy recovery induction motor drives are used in high power applications, in which by controlling the slip power a variable speed drive system is provided. However, poor power factor is a disadvantage of the system. Presence of sub-harmonics of the line frequency on the stator side is one of the special features of these drives. A phase-controlled inverter can

Jawad Faiz; H. Barati; Eyup Akpinar

2001-01-01

225

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

226

Bearing Fault Detection in Induction Motor-Gearbox Drivetrain  

NASA Astrophysics Data System (ADS)

The main contribution in the hereby presented paper is to investigate the fault detection capability of a motor current signature analysis by expanding its scope to include the gearbox, and not only the induction motor. Detecting bearing faults outside the induction motor through the stator current analysis represents an interesting alternative to traditional vibration analysis. Bearing faults cause changes in the stator current spectrum that can be used for fault diagnosis purposes. A time-domain simulation of the drivetrain model is developed. The drivetrain system consists of a loaded single stage gearbox driven by a line-fed induction motor. Three typical bearing faults in the gearbox are addressed, i.e. defects in the outer raceway, the inner raceway, and the rolling element. The interaction with the fault is modelled by means of kinematical and mechanical relations. The fault region is modelled in order to achieve gradual loss and gain of contact. A bearing fault generates an additional torque component that varies at the specific bearing defect frequency. The presented dynamic electromagnetic dq-model of an induction motor is adjusted for diagnostic purpose and considers such torque variations. The bearing fault is detected as a phase modulation of the stator current sine wave at the expected bearing defect frequency.

Cibulka, Jaroslav; Ebbesen, Morten K.; Robbersmyr, Kjell G.

2012-05-01

227

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

Microsoft Academic Search

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

Takahiro Yamada; Keisuke Fujisaki

2008-01-01

228

Inexpensive Universal Stepping Motor Controller.  

National Technical Information Service (NTIS)

Many instruments for scientific research and development employ one or more motors for control of some function, or to position, shafts, gratings, mirrors, recorders, etc. Use of this factor provides one of the most simple and economical methods of automa...

D. E. Wisnosky J. S. Solomon

1973-01-01

229

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

230

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

231

Supply-pollution (SP) loss in induction motor  

SciTech Connect

Power supply in the field is often noticeably polluted with various degrees of harmonics content and unbalanced voltages. In order to assess the energy loss caused by the supply pollution in the widely used induction motors, a method based on the air-gap torque power is discussed.

Hsu, J.S.

1995-07-01

232

Harmonic analysis of slip energy recovery induction motor drives  

Microsoft Academic Search

The impact of electric drives on the power system in terms of harmonic generation is becoming increasingly important. Slip energy recovery induction motor drives (SERIMDs) have the rectifier and inverter connected to the rotor instead of the stator (the case in most conventional drives). The harmonic content of the SERIMD is thus quite different and arguably, less onerous than conventional

L. Refoufi; P. Pillay

1994-01-01

233

Induction motors with minimum waste of magnetic iron  

Microsoft Academic Search

An induction motor with minimum waste of magnetic iron has been developed. The stator core is made of silicon-iron steel strip, its width equal to the core height, and wound on edge to form a stack. Stator slots closed on the bore side and open on the outside for winding are formed together with teeth separating them by corrugating a

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

1984-01-01

234

Calculation and experimental analysis of induction motor eccentricity  

Microsoft Academic Search

This paper presents electromagnetic FEM field calculations and measured data on a three-phase induction motor. This machine is on purpose adapted to allow moving its rotor and so imposing eccentricities. The influence of the eccentricity is investigated by calculations and verified by measurements with a newly designed magnetic sensor and electronic device.

M. Rigoni; N. Sadowski; N. J. Batistela; J. P. A. Bastos; S. L. Nau; A. Kost

2010-01-01

235

Time domain analysis of induction motor starting transients  

Microsoft Academic Search

A simplified time-domain analysis based on the equivalent circuit, differential equations and the Laplace transform is presented for the calculation of the starting current of an induction motor. The model provides a closed-form solution to the transient starting inrush current. The solution is realized by the superposition of natural and forced responses of the starting current components. The calculated transient

R. Natarajan; V. K. Misra; M. Oommen

1989-01-01

236

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

237

Dynamic Performance of Subway Vehicle with Linear Induction Motor System  

Microsoft Academic Search

The light rail vehicle with Linear Induction Motor (LIM) bogie, which is a new type of urban rail traffic tool, has the advantages of low costs, wide applicability, low noise, simple maintenance and better dynamic behavior. This kind of vehicle, supported and guided by the wheel and rail, is not driven by the wheel\\/rail adhesion force, but driven by the

Pingbo Wu; Ren Luo; Yan Hu; Jing Zeng

2010-01-01

238

Demonstration of Lenz's Law with an Induction Motor  

ERIC Educational Resources Information Center

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

Kraftmakher, Yaakov

2005-01-01

239

Fault Detection and Protection of Induction Motors Using Sensors  

Microsoft Academic Search

Protection of an induction motor (IM) against possible problems, such as overvoltage, overcurrent, overload, overtemperature, and undervoltage, occurring in the course of its operation is very important, because it is used intensively in industry as an actuator. IMs can be protected using some components, such as timers, contactors, voltage, and current relays. This method is known as the classical method

Ramazan Bayindir; I. Sefa; I. Colak; Askin Bektas

2008-01-01

240

State of art on condition monitoring of induction motors  

Microsoft Academic Search

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

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

2010-01-01

241

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

DOEpatents

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

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

2011-03-29

242

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

243

Eigenvalue sensitivity of a speed-sensorless CSI-fed induction motor system  

Microsoft Academic Search

The evaluation and interpretation of eigenvalue sensitivity for a speed-sensorless LCCSI-fed induction motor drive system are presented. It is well known that the sensitivity of the dynamic stability with respect to any parameter variations of the system matrix, A, can be characterized by the sensitivity of the eigenvalues with respect to the parameter variations. Based on a control system devised

Joong-Ho Song; Kwang-Bae Kim; Myung-Joong Youn

1993-01-01

244

A Wide-Range Static Inverter Suitable for AC Induction Motor Drives  

Microsoft Academic Search

A dc to ac, variable voltage, variable frequency, three-phase, external impulse commutated inverter, rated at 200 kVA, is described that controls the speed of an induction motor that is suitable for traction applications. The inverter is supplied from a variable voltage dc source for the load circuit and a fixed voltage dc source for the commutation circuit. Isolation between the

PAUL M. A. ESPELAGE; Jacob A. Chiera; Fred G. Turnbull

1969-01-01

245

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

246

Motor control as the control of perception.  

PubMed

This paper describes a test of Perceptual Control Theory (PCT), which views motor control as part of a process of controlling perceptual inputs rather than motor outputs. Sixteen undergraduate students (M age = 19.9 yr.) were asked to control one of three different perceptual aspects of an animated display--a shape, a motion or a sequence--using the same motor output, a key press. Animation rate was varied while quality of control was measured in terms of the proportion of time that the perception was maintained in the goal state. The results showed that increased animation rate made it hardest to control the more complex perceptions (motion and sequence) even though the same output was used to control all perceptions. This result is consistent with PCT, which predicts that the temporal constraints on control are ultimately a function of the type of perception controlled rather than the type of output used to control it. PMID:24422353

Marken, Richard S; Mansell, Warren; Khatib, Zahra

2013-08-01

247

Direct torque control of permanent magnet synchronous motor drive with a three-level inverter  

Microsoft Academic Search

The direct torque control (DTC) technique for a three-phase induction and synchronous motor is receiving increasing attention due to the important advantages as the elimination of the current controllers and the low dependence on motor parameters when compared with other motor control techniques. However high torque and stator linkage magnetic flux ripples and stator voltage and, stator current harmonic contents

K. E. B. Quindere; E. F. Ruppert; M. E. F. de Oliveira

2006-01-01

248

Simulation of electrical faults of three phase induction motor drive system  

Microsoft Academic Search

The simulation of a three-phase induction motor drive system is presented with emphasis on the electrical faults of the inverter and induction motor. Using the basic components of MATLAB SIMULINK toolboxes, the drive system is modeled. An induction motor with mechanical faults is modeled using the winding function method (WFM) and is integrated with the drive model using S-function. The

Zhongming Ye; Bin Wu

2001-01-01

249

Detection of broken rotor bars in induction motors using state and parameter estimation  

Microsoft Academic Search

The detection of broken rotor bars in induction motors is studied. The hypothesis on which detection is based is that the apparent rotor resistance of an induction motor will increase when a rotor bar breaks. Here, the apparent rotor resistance is that in the balanced steady-state single-phase electrical model of an induction motor. To detect broken rotor bars, measurements of

K. Rae Cho; J. H. Lang; S. D. Umans

1992-01-01

250

Thermal modelling for an induction motor  

NASA Astrophysics Data System (ADS)

The authors of this paper intend to achieve the study of the thermal behaviour in permanent rate of an asynchronous motor with a wounded rotor of a rated power of 4kW. 66 thermocouples have been settled in the stator at different places like the centers and the bottoms of the windings or the middle of the yoke. A design has been realized thanks to the magnetostatic modulus of the computation software with the finite elements method Flux2d converted in a resolution tool of the heat equation. Another originality of this study is to introduce areas including a contact thermal resistance phenomenon in some places of the motor to characterize the motor thermophysical parameters and to obtain the experimentation-calculation convergence. Les auteurs de cet article se proposent de réaliser l'étude du comportement thermique en régime permanent d'un moteur asynchrone de 4kW à rotor bobiné. 66 thermocouples ont été positionnés en différents lieux du stator tels que les milieux des bobinages, les fonds d'encoches ou encore le milieu des tôles. Un modèle a été réalisé à l'aide du logiciel de calculs magnétostatiques par éléments finis Flux2d converti en un outil de résolution de l'équation de la chaleur. Une autre originalité de cette étude a été d'introduire en certains endroits du moteur des zones où la notion de résistance thermique de contact est particulièrement importante. L'introduction de paramètres thermophysiques les caractérisant s'est avérée nécessaire pour obtenir la convergence expérimentation-simulation.

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

1993-09-01

251

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

252

Universal digital motor speed controllers  

Microsoft Academic Search

Approaches to motor speed control are reviewed. Universal add-on products that are now available for general industrial speed control applications are described, and their benefits are examined. In particular, it is shown how precision speed regulation and multimotor coordinated control can benefit textile manufacturers in stretch\\/draw, metering pump, and coating\\/finishing applications. Ordinary DC, regenerative DC, AC inverters, or clutch controllers

G. A. Gauvin

1989-01-01

253

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

NASA Astrophysics Data System (ADS)

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

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

254

Modeling and Simulating of Single Side Short Stator Linear Induction Motor with the End Effect  

NASA Astrophysics Data System (ADS)

Linear induction motors are under development for a variety of demanding applications including high speed ground transportation and specific industrial applications. These applications require machines that can produce large forces, operate at high speeds, and can be controlled precisely to meet performance requirements. The design and implementation of these systems require fast and accurate techniques for performing system simulation and control system design. In this paper, a mathematical model for a single side short stator linear induction motor with a consideration of the end effects is presented; and to study the dynamic performance of this linear motor, MATLAB/SIMULINK based simulations are carried out, and finally, the experimental results are compared to simulation results.

Hamzehbahmani, Hamed

2011-09-01

255

A simplified scheme for induction motor condition monitoring  

NASA Astrophysics Data System (ADS)

This work proposes a general scheme to detect induction motor fault by monitoring the motor current. The scheme is based on signal processing (predictive filters) and soft computing technique (fuzzy logic). The predictive filter is used in order to separate the fundamental component from the harmonic components. Fuzzy logic is used to identify the motor state. Finite element method (FEM) is utilised to generate virtual data that allows to test the proposed technique and foresee the change in the current under different motor conditions. A simple and reliable method for the detection of stator winding failures based on the phase current amplitudes is implemented and tested. The layout has been proved in MATLAB/SIMULINK, with both data from FEM motor simulation program and real measurements. The proposed method has the ability to work with variable speed drives and avoids the detailed spectral analysis of the motor current. This work shows the feasibility of spotting broken rotor bars, eccentricities and inter-turn short-circuit by monitoring the motor currents.

Rodríguez, Pedro Vicente Jover; Negrea, Marian; Arkkio, Antero

2008-07-01

256

Broken rotor symptoms in the sensorless control of induction machine  

Microsoft Academic Search

Purpose – The purpose of this paper is to investigate the need for a universal method for sensorless controlled induction motor drive diagnosis. The increasing number of sensorless control systems in industrial applications require a universal method for the drive diagnosis, which provides reliable diagnostic reasoning independent of control system structure and state variables measurement or estimation method. Design\\/methodology\\/approach –

Piotr Ko?odziejek; El?bieta Bogalecka

2012-01-01

257

Fault detection on a real three-phase induction motor: simulation and experimental results on residual generation  

Microsoft Academic Search

AC machines have become the industrial standard not only in high power-constant speed applications, but also in the medium and low power range. While most of the problems related to the feedback control of AC motors have been successfully solved, another crucial point emerged with the diffusion of induction motors: the condition monitoring and the detection of their most common

A. Contin; S. D'Orlando; G. Fenu; R. Menis; S. Milo; T. Parisini

2001-01-01

258

An Experimental Closed-Loop Variable Speed Drive Incorporating a Thyristor Driven Induction Motor  

Microsoft Academic Search

Closed-loop control of a 3-phase induction motor is investigated where the stator voltages are varied, at line frequency, by the controlled firing of silicon-controlled rectifiers (thyristors). Steady-state torque-speed curves are given and the transient response of the drive to step changes of reference signal is shown. The rapid transient response of the drive due to transistorized thyristor firing circuits is

William Shepherd; Jack Stanway

1967-01-01

259

A robust speed control of Ac motor drives based on fuzzy reasoning  

Microsoft Academic Search

Fuzzy-logic based control of an induction motor is discussed. The controller uses the indirect vector control method to decouple the motor current components. The fuzzy controller uses a simple rule set obtained by a modification of the parameters of a linear controller. Results obtained via simulation are reported, showing the excellent behavior of the fuzzy controller

E. Galvan; F. Barrero; M. A. Aguirre; A. Torralba; L. G. Franquelo

1993-01-01

260

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

Microsoft Academic Search

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

S. C. Peak

1982-01-01

261

Lightweight type linear induction motor and its characteristics  

SciTech Connect

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

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

1994-08-01

262

Voltage oscillatory instability caused by induction motor loads  

SciTech Connect

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

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

1996-08-01

263

Ac hysteresis loop measurement of stator-tooth in induction motor  

SciTech Connect

The properties of ac hysteresis loop of a stator tooth in a 5 hp induction motor was measured and analyzed. The load increase on the motor decreased magnetic induction, however increase the minor hysteresis loops in the high induction region. This effect caused increase in the core loss. Depending on condition of the motor, the core loss of the stator tooth can be 50% greater than the core loss under sinusoidal magnetic induction waveform.

Son, D.

1999-09-01

264

Sensorless Control of Induction Machines—With or Without Signal Injection?  

Microsoft Academic Search

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

Joachim Holtz

2006-01-01

265

Motor Controller System For Large Dynamic Range of Motor Operation  

NASA Technical Reports Server (NTRS)

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

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

2006-01-01

266

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

267

Speed sensorless field orientation control of the induction machine  

Microsoft Academic Search

A speed estimation method is proposed for an induction machine and its application to the flux observer based field orientation (FOFO) control system is discussed. The motor speed is estimated based on the difference between two flux estimators. Its convergence performance is estimated and the authors propose an assignment method. The speed estimator is applied to the FOFO controller. Experiments

H. Tajima; Y. Hori

1991-01-01

268

Induction Motor Drive with Reduced Speed Range  

Microsoft Academic Search

\\u000a Some mechanical loads, such as fans or centrifugal pumps, exhibit a strong dependence of the load torque on speed, so that\\u000a a limited speed control range suffices for achieving the desired effect. The same is true for rotating converters employing\\u000a a flywheel, Sect. 7.4; since the kinetic energy of the rotating masses varies with the square of the speed, there

Werner Leonhard

269

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

270

Analysis of insulation characteristics of low-voltage induction motor driven by IGBT PWM inverter  

Microsoft Academic Search

IGBT PWM inverter driven induction motors for variable speed applications have been widely used since their introduction. Recently, stator winding insulation failures have attracted much concern due to high dv\\/dt of IGBT inverter output. In this paper, the detailed insulation test results of 26 low-voltage induction motors are presented. Six different types of insulation techniques are applied to 26 motors.

Don-Ha Hwang; Doh-Young Park; Yong-Joo Kim; Dong-Hee Kim; Ja-Yoon Koo; Jin-Hong Kim

2000-01-01

271

Research on Reciprocal Power-fed Linear Induction Motor Drive Test Rig for Linear Metro  

Microsoft Academic Search

This paper presents a reciprocal power-fed linear induction motor (LIM) drive test rig for linear metro. Two inverter-fed linear induction motors on a common shaft are used in this test rig. One is as the drive motor, and the other is as the traction load. The DC links of both inverters are connected to each other to circulate the energy,

Jianqiang Liu; Zhiwen Ma; Zhongping Yang; Trillion Q. Zheng

2006-01-01

272

Inductance Calculation and New Modeling of a Synchronous Reluctance Motor Using Flux Linkages  

NASA Astrophysics Data System (ADS)

New modeling of a synchronous reluctance motor SynRM which has non-linear magnetic characteristics is proposed. And a control method of the SynRM using the new model is developed. The new model is based on the inductance data table or the flux linkage data table which is calculated with the flux linkages of the SynRM at each current (id, iq). Detailed calculation method of the inductances is described. The calculated torque TA with the inductance data table is compared with the torque Tfem which is calculated by FEM and the difference is less than 5% at the rated torque. Therefore the accuracy of the new model is certified. And the same method is applicable to an interior permanent magnet synchronous motor IPMSM. The high performance motor control is realized. The exact current commands (id, iq), the exact voltage feed-forward commands (FFd, FFq) and the adaptive current loop gain (Gd, Gq) are obtained using the FEM data of the motor.

Nashiki, Masayuki; Inoue, Yoshimitu; Kawai, Youichi; Okuma, Shigeru

273

Ultra-Compact Motor Controller  

NASA Technical Reports Server (NTRS)

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

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

2012-01-01

274

Application of Linear Induction Motor for Tension Supply and Heating to Thin Steel Sheet  

Microsoft Academic Search

A linear induction motor to be able to make an induction heating and a tension in thin steel sheet treatment process is researched. The major problems in the application of the linear induction motor are meandering of thin steel plate by the electromagnetic force in the normal direction, the heating characteristic and the evaluation of the thrust force as a

Takahiro Yamada; Keisuke Fujisaki

2007-01-01

275

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

276

Detection of stator short circuit faults in three-phase induction motors using motor current zero crossing instants  

Microsoft Academic Search

Stator faults typically have a significant share amongst the common type of faults in industrial three-phase induction (asynchronous) motors. This paper presents a motor current signature analysis (MCSA)-based diagnostics of the stator winding short circuit fault. This type of fault happens due to the destruction of the turn insulation, and can be very detrimental causing motor shutdown. Instead of traditional

Abhisek Ukil; Shuo Chen; Andrea Andenna

2011-01-01

277

Investigation of Motor Characteristics when Connected to a Nola Controller.  

National Technical Information Service (NTIS)

Tests performed on Nola-type power factor controllers for induction motors are described. Emphasis on energy conservation during the past two years has prompted many manufactuers to apply to NASA for licenses to produce both single-phase and three-phase c...

1982-01-01

278

An optimized algorithm for torque oscillation reduction in DTC-induction motor drives using 3-level NPC inverter  

Microsoft Academic Search

The paper presents a direct torque control DTC for induction motor drive using a 3-level NPC inverter. The control is optimized for torque oscillation reduction. The control is described evidencing the good performance validated by means of simulation. The results are reported and discussed in the paper.

G. Brando; R. Rizzo

2004-01-01

279

Motorized control for mirror mount apparatus  

DOEpatents

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

Cutburth, Ronald W. (Tracy, CA)

1989-01-01

280

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

281

Power quality improvement in DTC based induction motor drive using Minnesota rectifier  

Microsoft Academic Search

This paper presents power quality improvement at the utility interface for a Direct Torque Controlled (DTC) induction motor drive by making use of a Minnesota rectifier. The proposed Minnesota rectifier for a 2.2 kW drive is designed, modeled and simulated in MATLAB\\/Simulink platform. The design of the proposed Minnesota rectifier is developed along with the necessary modifications required for making

Bhim Singh; G. Bhuvaneswari; Sandeep Madishetti

2011-01-01

282

The rapid soft re-switching technology of three-phase induction motors  

Microsoft Academic Search

For induction motor rotating near the synchronous speed, re-switching of power supply could be realized by rapid soft re-switching technology which could eliminate or reduce the inrush current and torque. The intelligent hybrid switches(IHS) based on SCRs is used to implement the control strategy of rapid soft re-switching with series of firing angles. Aiming at the alternating state of soft

Xueshen Cui; Yingli Luo; Ling Wu; Yulei Yang; Zhenhua Zhou; Xiaofang Liu

2008-01-01

283

Modeling, simulation and implementation of a five-phase induction motor drive system  

Microsoft Academic Search

This paper presents a comprehensive simulation model of a five-phase induction motor drive system. Both open-loop and closed-loop control is elaborated. The complete component modeling is developed using `simpower system' blocksets of Matlab\\/Simulink. To address the real time implementation issues, dead banding of the inverter switches are also incorporated in the simulation model. To validate the modeling procedure, experimental implementation

Atif Iqbal; S. M. Ahmed; M. A. Khan; M. R. Khan; H. Abu-Rub

2010-01-01

284

Sensorless acquisition of the rotor position angle of induction motors with arbitrary stator windings  

Microsoft Academic Search

The anisotropy of a cage rotor is utilized to determine the angular position of the rotor in an induction machine. The switching transients generated by a pulsewidth-controlled inverter serve as test signals. The response of the three-inverter terminal currents is exploited to derive a quasi-instantaneous rotor position signal. The position is sensed at the inverter through the three-phase motor cable

Joachim Holtz; Jorge Juliet

2005-01-01

285

Low Speed Performance Operation of Induction Motors Drives Using Low-Resolution Speed Sensor  

Microsoft Academic Search

In this paper, indirect field oriented control (IFOC) of induction motor at very low speed range (1-5 rpm) using a low-count encoder is presented. To test the lowest possible pulse encoder that gives both satisfactory performance for IFOC algorithm and precise enough speed information, a low-count encoder implementation algorithm is developed. This algorithm converts high-resolution encoder data to various number

Bilal Akin; S. B. Ozturk; P. Niazi; H. A. Toliyat; A. Goodarzi

2006-01-01

286

Effects of Common-Mode Active Filtering in Induction Motor Drives for Electric Vehicles  

Microsoft Academic Search

This paper deals with the active common-mode (CM) voltage compensation in an induction motor drive where the inverter is supplied by a dc source, which is typical of vehicle applications. The CM voltage at motor terminals, creating a shaft voltage through the motor air gap with possible rise in bearing current, can endanger motor reliability and reduce its lifetime. Therefore,

Maria Carmela Di Piazza; Antonella Ragusa; Gianpaolo Vitale

2010-01-01

287

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

Microsoft Academic Search

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

Slobodan N. Vukosavic; Aleksandar M. Stankovic

2001-01-01

288

Implementation of direct torque control of induction machine utilising TMS320C31 digital signal processor  

Microsoft Academic Search

Digital signal processors (DSPs) are becoming more popular in the area of AC motor control, in particular the induction motor drives. The fast number crunching capabilities of DSPs which are traditionally meant for data processing tasks such as image processing and speech recognition, are being utilised to perform on-line calculation of the AC motor variables, such as electromagnetic torque, fluxes,

A. H. M. Yatim; N. R. N. Idris

2001-01-01

289

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

290

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

291

Three-phase induction motor loads on a variable frequency wind electric generator  

Microsoft Academic Search

The influence of three-phase induction motor loads on a variable-frequency wind electric generator is evaluated. An asynchronous wind electric generator is simulated by a dc motor driving an ac alternator. The output powers an air conditioning unit having a three-phase induction motor. It is found that the motors start and operate well for any frequency if the voltage is proportional

G. L. Johnson; H. S. Walker

1977-01-01

292

Study on fuzzy control of induction machine with direct torque control approach  

Microsoft Academic Search

Direct torque control (DTC) is a new method of induction motor control. The key issue of the DTC is the strategy of selecting proper stator voltage vectors to force stator flux and developed torque within a prescribed band. Due to the nature of hysteresis control adopted in DTC there is no difference in control action between a larger torque error

Yang Xia; Wardina Oghanna

1997-01-01

293

A novel dynamic overmodulation strategy for fast torque control of high saliency ratio AC motor  

Microsoft Academic Search

This paper describes the dynamic overmodulation strategies for the fast torque control of high saliency ratio AC motor. In the case of the high saliency ratio AC motor, the dynamic control of both d- and q-axis currents is required for the fast torque control with optimal efficiency. But because the stator inductance is designed large enough to generate desired reluctance

Bon-Ho Bae; Seung-Ki Sul

2002-01-01

294

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

295

Conditions for self-sustained oscillations in feedback control of AC motor speed by power electronic controllers  

Microsoft Academic Search

Speed control of AC induction motors by power electronic controllers is considered. The basic method of speed control is obtained by application of variable frequencies to the motor. Certain parameters are subject to modification by the user in the field. A model of the resulting operation is shown to contain a specific nonlinearity. In feedback applications the interaction of the

Robert L. Drake

2003-01-01

296

Implementation of a reduced order stator-flux observer for three level NPC inverter-fed induction motor drive  

Microsoft Academic Search

This paper presents a three-level neutral point clamped (NPC) inverter fed induction motor for high power traction applications in Indian Railway Technology. This drive is operated under direct torque control (DTC) method, and it is well known for faster torque and flux control system. This method is simple to implement but DTC do not show good performance in low speed

Ranjan K. Behera; S. K. Parida; S. Behera; S. P. Das

2010-01-01

297

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.

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

2012-01-01

298

New Motor Control Methods for Home VCR  

Microsoft Academic Search

The development of a new method of driving the brushless DC motor, called the QUASI-SINE WAVE method, reduces motor torque ripple to one quarter that of the conventional method. New methods for controlling the noiseless still and slow modes have also been developed; the former being to drive the capstan motor corresponding to the time interval between the noise band

Ryohei Uchida; Toshifumi Fujii; Tatsuo Yamasaki

1983-01-01

299

Performance analysis of three-phase capacitor motor in frequency control system  

Microsoft Academic Search

Three-phase capacitor motor with main winding and auxiliary winding vertically arranged in space can effectively weaken the harmonic MMF (magnetic motive force), and raise efficiency and power factor. In this paper, performance of new three-phase capacitor motor in frequency control system is analyzed. Through the contrast experiment between the new three-phase capacitor motor and three-phase induction motor, it has an

Zheng-Feng Ming; Guang-Zheng Ni; Bing-Zhong Yang

2010-01-01

300

Vector control of induction machines using wavenet based controller for traction applications  

Microsoft Academic Search

In this paper induction motor and its vector control are simulated and a novel artificial neural network based on wavelets is used as controller in order to make the system more robust. The data for training the NN is extracted from the process with several PID set controller to achieve the best operation for all regions of the system operations.

H. Moghbelli; A. Rahideh; A. A. Safavi

2003-01-01

301

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

302

The next generation motor control method, DTC direct torque control  

Microsoft Academic Search

Direct torque control (DTC) is the latest AC motor control method developed by ABB. ACS600 is the first application utilising DTC. DTC is a control method that embeds a motor and inverter together and controls them together in an optimal manner. In DTC, all switch changes are based directly on the electromagnetic state of the motor. Optimum switching is determined

P. Tiitinen; M. Surandra

1996-01-01

303

Torque and Rotational Speed Estimation with Parameter Identification of Line-Start Induction Motor for Motor-Operated Valves  

NASA Astrophysics Data System (ADS)

This paper presents a method for estimating the torque and rotational speed of line-start induction motors for motor-operated valves. Routine inspections of the valves are carried out because motor-operated valves are used in momentous plants such as power plants where securing, the reliability of the valves are very important. Movement environments in these plants are characterized by high temperature and humidity and therefore, it is difficult to position sensors near motors. In such a case, we must troubleshoot the system without using torque or speed sensors. The proposed method can estimate the torque and speed of an induction motor by using currents and voltages near the switchboard. Furthermore, we propose the parameter identification of mutual inductance by comparing the scalar and vector products between currents and voltages. The proposed method is validated by experimental results.

Takahashi, Akiko; Oguro, Ryuichi; Hanamoto, Tsuyoshi; Tanaka, Koji; Nagaiwa, Keiichiro

304

Programmable controller for multiphase stepper motor  

SciTech Connect

A programmable controller for a multiphase stepper motor is described that is designed for use in scanning devices of x-ray spectrometers and other physics apparatus. The system provides considerable memory economy with respect to total size and the number of bits, permits automatic development of stepper-motor control programs, and allows stepper motors with any number of phases to be controlled merely by changing the program stored in the memory unit.

Lozovoi, L.N.

1987-04-01

305

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.

306

Performance of induction motor driven submersible pump using Matlab\\/Simulink  

Microsoft Academic Search

This paper presents a generalized formulation for the computer-aided analysis of induction motor driving a submersible pump. A simple and more realistic MATLAB\\/SIMULINK model of the induction motor driven submersible pump has been developed. This paper proposes a simple algorithm to predict the performance of the system under various heads (H) at a given voltage (V) and frequency (f) which

V. Vivek; G. Uma; R. P. Kumudini Devi; C. Chellamuthu

2002-01-01

307

FPGA-Based Online Induction Motor Multiple-Fault Detection with Fused FFT and Wavelet Analysis  

Microsoft Academic Search

Online monitoring of rotary machines, like induction motors, can effectively diagnosis electrical and mechanical faults. The origin of most recurrent faults in rotary machines is in the components: bearings, stator, rotor and others. Different methodologies based on current and vibration monitoring have been proposed using FFT and wavelet analysis for preventive monitoring of induction motors resulting in countless techniques for

E. Cabal-Yepez; Roque A. Osornio-Rios; René de Jesús Romero-Troncoso; J. R. Razo-Hernandez; R. Lopez-Garcia

2009-01-01

308

Estimation of short circuit current due to a group of induction motors using an aggregation model  

Microsoft Academic Search

This paper presents generalized equations for determining an aggregation model to represent a group of induction motors connected in the same bus of industrial power systems. The model is employed in calculating short circuit current contribution with different types of faults from the group of induction motors. The simulation and analysis are performed using PSCAD\\/EMTDC. Various case studies are used

W. Suwanwej; A. Kunakorn

2004-01-01

309

Recent Developments in High Performance Variable Speed Multiphase Induction Motor Drives  

Microsoft Academic Search

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

Emil Levi

310

Electromechanical performance of induction motor/drive systems subjected to voltage sags  

NASA Astrophysics Data System (ADS)

Induction Motors are workhorses for many industries. They are extensively utilized in industrial variable-frequency drive (VFD) or adjustable-speed drive (ASD) applications as well as constant speed applications. Recent advances in power electronics have made AC motor drives an economically viable solution for ASD applications traditionally dominated by dc motor drives. In this study, electromechanical performance variables of an Induction Motor (IM) have been studied during the balanced voltage sags. For this purpose a laboratory prototype of an industrial mixer has been designed. IM has been coupled to a speed reducer that is worm gear type with a ratio 10 to 1. Then the reducer is vertically coupled to a food process mixer within a metal canister. The mixer represents a high friction load with practically zero inertia. Voltage, current, speed, and power measurements have been collected and compared with the simulation results from Simnon. An open-loop control Volts per Hertz boost strategy has been used in order to compensate the speed loss during the three-phase balanced voltage sags. Both compensated and uncompensated cases have been run and compared with simulation results. Results are verified with a reasonably good agreement that the total system modeling is successful and boost compensation circuit is effective.

Tunaboylu, Serdar N.

311

A COMPUTATIONAL NEUROANATOMY FOR MOTOR CONTROL  

PubMed Central

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

Shadmehr, Reza; Krakauer, John W.

2008-01-01

312

Evaluation of methods of speed estimation of asynchronous motor based on direct torque control (DTC)  

Microsoft Academic Search

In this paper two methods of speed estimation of a three phase induction motor system are analyzed. The method of direct torque control with no sensors was used to control the motor system. The mathematical models of the above mentioned methods are analyzed for every case. Following the estimation method analysis of open and closed loop the observation method of

G. Adamidis; M. Leibadaras

2010-01-01

313

Optomechanical control of molecular motors  

NASA Astrophysics Data System (ADS)

The majority of mechanisms that can be deployed for optical micromanipulation are not especially amenable for extension into the nanoscale. At the molecular level, the rich variety of schemes that have been proposed to achieve mechanical effect using light commonly exploit specific chemical structures; familiar examples are compounds that can fold by cis-trans isomerization, or the mechanically interlocked architectures of rotaxanes. However, such systems are synthetically highly challenging, and few of them can realistically form the basis for a true molecular motor. Developing the basis for a very different strategy based on programmed electronic excitation, this paper explores the possibility of producing controlled mechanical motion through optically induced modifications of intermolecular force fields, not involving the limitations associated with using photochemical change, nor the high intensities required to produce and manipulate optical binding forces between molecules. Calculations reveal that significant, rapidly responsive effects can be achieved in relatively simple systems. By the use of suitable laser pulse sequences, the possibilities include the generation of continuous rotary motion, the ultimate aim of molecular motor design.

Andrews, David L.; Dávila Romero, Luciana C.; Leeder, Jamie M.; Coles, Matt M.

2010-08-01

314

Optimal control of stepper motor stability program  

Microsoft Academic Search

In this study, a principal model of a stepper motor is described. Then it stability program was designed based on linear quadratic optimal control theory and the controllability and observability were studied. Then wardware design and the main routine flowpath chart are given. It has been observed that MCU can be useful in controlling stepper motor. Also the advantage of

Bo Chen; Yazhou Wang; Chibing Hu

2010-01-01

315

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

316

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

317

Fuzzy Control of Small Servo Motors.  

National Technical Information Service (NTIS)

To explore the benefits of fuzzy logic and understand the differences between the classical control methods and fuzzy control methods, the Togai InfraLogic applications engineering staff developed and implemented a motor control system for small servo mot...

R. Maor Y. Jani

1993-01-01

318

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

319

Field assessment of induction motor efficiency through air-gap torque  

SciTech Connect

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

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

1995-11-01

320

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

321

Induction motor vibrations in view of the API 541-4th edition  

Microsoft Academic Search

This paper discusses induction motor vibration, how API 541 views it, and what it means to the customer and manufacturer.Good motor performance depends on the electrical and mechanical design and the motor operating conditions. Sound mechanical design reduces the vibration levels and extends the life of the machine. To follow and understand the API 541 specification, this paper will discuss

R. Mistry; W. R. Finley; S. Kreitzer

2008-01-01

322

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

NASA Astrophysics Data System (ADS)

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

Kim, K.; Parlos, A. G.

2002-03-01

323

A computational neuroanatomy for motor control  

Microsoft Academic Search

The study of patients to infer normal brain function has a long tradition in neurology and psychology. More recently, the\\u000a motor system has been subject to quantitative and computational characterization. The purpose of this review is to argue that\\u000a the lesion approach and theoretical motor control can mutually inform each other. Specifically, one may identify distinct\\u000a motor control processes from

Reza ShadmehrÆJohn; John W. Krakauer

2008-01-01

324

Induction motors with minimum waste of magnetic iron  

NASA Astrophysics Data System (ADS)

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

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

1984-11-01

325

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

326

Dynamic performance of an induction motor driven trolleybus  

Microsoft Academic Search

This paper deals with the electromechanical dynamic performance of a trolleybus, whose electrical traction system is based on a voltage source inverter fed motor. The voltage source outputs the combined variable-AC-voltage and variable-frequency required by the different vehicle's control modes. The street DC catenary serves as a DC voltage source for the inverter. The authors depart from a brief presentation

A. Nave-Segura; J. Rodriguez-Rivas; J. Ortega-Cuevas; O. Diaz-Gonzalez

1999-01-01

327

Input power conditioning of a linearized induction motor drive using three level front-end converter and passive filter  

Microsoft Academic Search

This paper proposes a simple three phase, three level IGBT based ac-dc neutral point clamped converter with a shunt passive filter, at the front end of a PWM VSI feeding induction motor drive, to compensate reactive power, reduce harmonics in source current and to regulate dc link voltage. Mathematical model is used to design the control scheme for the front-end

Kanungo Barada Mohanty; Madhu Singh

2011-01-01

328

Method and apparatus for controlling multiple motors  

DOEpatents

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

Jones, R.G.; Kortegaard, B.L.; Jones, D.F.

1986-07-22

329

Fuzzy control of small servo motors  

NASA Technical Reports Server (NTRS)

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

Maor, Ron; Jani, Yashvant

1993-01-01

330

Investigation of motor characteristics when connected to a Nola controller  

NASA Astrophysics Data System (ADS)

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

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

1982-12-01

331

AC-fed universal motor with open loop speed control and PFC  

Microsoft Academic Search

A drive consisting of a series-wound motor, a CUK converter and an input bridge rectifier is presented. The power electronics provides sinusoidal input current. The field winding of the motor acts as the boost inductance. The armature winding is connected to the converter's output. The circuit is suitable to replace triac control of vacuum cleaners, washing machines, power tools etc.

Giinter Schroder; Joanna Bekiesch; Henrik Siebel

2003-01-01

332

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

333

Ultra-Compact Motor Controller  

NASA Technical Reports Server (NTRS)

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

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

2012-01-01

334

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

NASA Astrophysics Data System (ADS)

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

Yang, Bo-Suk; Kim, Kwang Jin

2006-02-01

335

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

336

Computerized Torque Control for Large dc Motors  

NASA Technical Reports Server (NTRS)

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

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

1987-01-01

337

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

338

Oscillation control system for electric motor drive  

DOEpatents

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

Slicker, J.M.; Sereshteh, A.

1988-08-30

339

Analysis of current source induction motor drive fed from photovoltaic energy source  

SciTech Connect

The transient and steady state analysis of an induction motor fed from a photovoltaic energy source through a current-source inverter is presented in this paper. It is shown that the steady state and dynamic behaviors of the motor differ considerably from the case in which it is fed from a perfect current source. In particular, the steady state capability of the motor is limited by the chopping ratio of the dc-dc converter and the switching frequency of the current-source inverter. Analysis of the small signal perturbation equations of the system shows that the system is lightly damped for operating voltages of the array that are less than that of the array voltage corresponding to array maximum output power. For some values of array voltage, it has a non-minimum phase characteristic due to the non-linear relationship between the array voltage and current. This non-minimum phase characteristic adds an inherent difficulty to the design of a robust closed loop feedback controller for the motor drive system.

Ojo, O. (Tennessee Technological Univ., Cookeville, TN (USA). Dept. of Electrical Engineering)

1991-03-01

340

Independent Position Controls of Two Permanent Magnet Synchronous Motors Fed by a Five-Leg Inverter  

Microsoft Academic Search

This paper presents the experimental test results of the independent vector control characteristics of two three-phase permanent magnet synchronous motors (PMSMs) fed by a five-leg inverter (FLI). Recently, the use of PMSM is more and more spreading in industrial field. It has the features of saving-weight and high-efficiency compared with DC motor and induction motor. The maximum feature of the

Hiroyuki Enokijima; Kazuo Oka; Kouki Matsuse

2010-01-01

341

Structured attachment of bacterial molecular motors for defined microflow induction  

NASA Astrophysics Data System (ADS)

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

Woerdemann, Mike; Hörner, Florian; Denz, Cornelia

2014-01-01

342

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

343

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

344

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

SciTech Connect

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

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

1999-09-01

345

Re-adhesion control of electric motor coach based on disturbance observer and sensor-less vector control  

Microsoft Academic Search

When the adhesion force coefficient between rail and driving wheel decreases, the electric motor coach has slip phenomena. We have already proposed the anti-slip re-adhesion control system based on a disturbance observer. This system has the fine torque response for one driving wheel driven by one inverter-fed induction motor. However, the bogie of an electric motor coach has four driving

Satoshi Kadowaki; Kiyoshi Ohishi; Ichiro Miyashita; Shinobu Yasukawa

2002-01-01

346

Line-Starting Three and Single-Phase Interior Permanent Magnet Synchronous Motors—Direct Comparison to Induction Motors  

Microsoft Academic Search

The performance comparison of three- and single-phase line-start interior permanent magnet synchronous motors (LSIPMSMs) and induction motors (IMs) with equal squirrel-cage design and symmetric four-pole stator windings is presented. The finite element method was employed in analysis of steady-state synchronous performance of LSIPMSMs. A magnetically linear lumped parameter model was employed in analysis of line-starting performance of LSIPMSMs, where the

Tine Marcic; Bojan Stumberger; Gorazd Stumberger; Miralem Hadziselimovic; Peter Virtic; Drago Dolinar

2008-01-01

347

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

348

A new method for the design optimization of three-phase induction motors  

SciTech Connect

The paper deals with the optimization problem of induction motors design. In particular a new global minimization algorithm is described; it tries to take into account all the features of these particular problems. A first numerical comparison between this new algorithm and a method widely used in the design optimization of induction motors has been performed. The obtained results show that the proposed approach is promising.

Daidone, A.; Parasiliti, F.; Villani, M. [Univ. dell`Aquila (Italy). Dipt. di Ingegneria Elettrica] [Univ. dell`Aquila (Italy). Dipt. di Ingegneria Elettrica; Lucidi, S. [Univ. di Roma La Sapienza (Italy). Dipt. di Informatica e Sistemistica] [Univ. di Roma La Sapienza (Italy). Dipt. di Informatica e Sistemistica

1998-09-01

349

Effect of electrical-utility-system voltage harmonics on induction motors  

NASA Astrophysics Data System (ADS)

Distortion of the electrical utility system voltage waveform can result in damage to or malfunction of user electrical equipment. An experiment was carried out to determine the effect of utility voltage harmonics on the temperature rise of single phase induction motors. The results suggest that utility voltage harmonics do not significantly affect the operating temperature of a single phase induction motor until the amplitudes of the harmonics are much larger than the amplitudes currently present in the U.S. utility system.

Rasmussen, N. E.

1981-03-01

350

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

351

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

352

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

Microsoft Academic Search

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

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

1992-01-01

353

Fault diagnosis in induction motors fed by PWM inverters  

Microsoft Academic Search

Motors have become critical components for many industries. A motor failure can result in the shutdown of a production line, or require that redundant equipment be utilised to circumvent the problem. By this way, the early detection of motor deterioration can increase plant availability and safety in an economical way. Many publications have investigated the detection of rotor and stator

Fernando Villada; Diego Cadavid; N. Munoz; D. Valencia; D. Parra

2003-01-01

354

Original benchmark for sensorless induction motor drives at low frequencies and validation of high gain observer  

Microsoft Academic Search

An original benchmark for the validation of sensorless induction motor observers is proposed to evaluate them particularly in the well-known case where the motor state could be unobservable. Due to the complexity of observation at low frequencies (specifically on our benchmark) we present an improvement of a high gain observer which has been tested and validated on the reference trajectories

Malek Ghanes; Alexis Girin; Tarik Saheb

2004-01-01

355

Design and application of Rogowski coil current sensor without integrator for fault detection in induction motors  

Microsoft Academic Search

This paper presents the study, design and application of a Rogowski coil current sensor without the integrator circuit that is typically used. This sensor is used as current probe for fault detection in induction motors by means of motor current signal analysis (MCSA).

O. Poncelas; J. A. Rosero; J. Cusido; J. A. Ortega; L. Romeral

2008-01-01

356

Voltage stresses on stator windings of induction motors driven by IGBT PWM inverters  

Microsoft Academic Search

In the IGBT PWM inverter, insulation breakdown and irregular voltage distribution on stator winding due to high rate of voltage rise (dv\\/dt) caused by high-frequency switching and impedance mismatches between inverter and motor have been treated as the main consideration. This paper describes the distribution characteristics of switching the surge voltage in the stator windings of an induction motor driven

Don-Ha Hwang; Ki-Chang Lee; Yong-Joo Kim; Sung-Woo Bae; Dong-Hee Kim; Chae-Gyun Ro

2003-01-01

357

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

358

A novel approach for broken-rotor-bar detection in cage induction motors  

Microsoft Academic Search

In this paper, a new approach is proposed to detect broken rotor bars in induction motors. The motor is disconnected from the supply, and the induced voltage in the stator due to only rotor flux is utilized to detect the fault. If there is any broken bar, it will directly affect the induced voltages in the stator windings. Using this

Jafar Milimonfared; H. M. Kelk; S. Nandi; A. D. Minassians; H. A. Toliyat

1999-01-01

359

Estimation of Induction Motor Operating Power Factor From Measured Current and Manufacturer Data  

Microsoft Academic Search

Three-phase induction (asynchronous) motors (IM) are industrial work-horses, making the protection of IM a very im- portant topic. IM protection devices typically monitor the motor current and\\/or voltage to provide the motor protection function- alities like current overload, over\\/under voltage, etc. One of the interesting parameters to monitor is the operating power factor (PF) of the IM, which provides better

Abhisek Ukil; Richard Bloch; Andrea Andenna

2011-01-01

360

Voltage stress on induction motors in medium voltage (2300 to 6900 V) PWM GTO CSI drives  

Microsoft Academic Search

This paper deals with voltage stress on induction motors in medium voltage PWM GTO current source inverter drives. The voltage stress on the motor in this transformerless drive is investigated. Analytical equations are derived for the calculation of the maximum peak line-to-ground voltage applied to the motor. It is demonstrated in the paper that this peak line-to-ground voltage could be

Bin Wu; F. DeWinter

1995-01-01

361

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

EPA Science Inventory

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

362

Chaos control by using Motor Maps.  

PubMed

In this paper a new method for chaos control is proposed, consisting of an unsupervised neural network, namely a Motor Map. In particular a feedback entrainment scheme is adopted: a chaotic system with a given parameter set generates the reference trajectory for another chaotic system with different parameters to be controlled: the Motor Map is required to provide the appropriate time-varying gain value for the feedback signal. The state of the controlled system is considered as input to the Motor Map. Particular efforts have been paid to the feasibility of the implementation. Indeed, the simulations performed have been oriented to design a Motor Map suitable for an hardware realization, thus some restrictive hypotheses, such as for example a low number of neurons, have been assumed. A huge number of simulations has been carried out by considering as system to be controlled a Double Scroll Chua Attractor as well as other chaotic attractors. Several reference trajectories have also been considered: a limit cycle generated by a Chua's circuit with different parameters values, a double scroll Chua attractor, a chaotic attractor of the family of the Chua's circuit attractors. In all the simulations instead of controlling the whole state space, only two state variables have been fed back. Good results in terms of settling time (namely, the period in which the map learns the control task) and steady state errors have been obtained with a few neurons. The Motor Map based adaptive controller offers high performances, specially in the case when the reference trajectory is switched into another one. In this case, a specialization of the neurons constituting the Motor Map is observed: while a group of neurons learns the appropriate control law for a reference trajectory, another group specializes itself to control the system when the other trajectory is used as a reference. A discrete components electronic realization of the Motor Map is presented and experimental results confirming the simulation results are shown. (c) 2002 American Institute of Physics. PMID:12779586

Arena, Paolo; Fortuna, Luigi; Frasca, Mattia

2002-09-01

363

Digital control of a brushless DC motor  

Microsoft Academic Search

The design of a high-performance capstan servo using a brushless DC motor is investigated. The implementation of the digital control uses classical control techniques with actual performance specifications used to design the controller. Details of hardware and software design are presented.

Sanaa Abdel-Azim; Jim A. Dreiling

1987-01-01

364

Motor controller design for hybrid electric vehicles  

Microsoft Academic Search

Motor and its control technology is one of main components of Hybrid Electric Vehicles (HEV). To meet the fast torque response demands of HEV, rotor flux-oriented based vector control algorithm with simulation model is concerned and modular design for hardware and software of controller is present in the paper. Series of anti-jamming and vibration isolation measurements are taken especially to

Yafu Zhou; Jing Lian; Dianting Cao; Wei Wang

2009-01-01

365

On the drive control strategy of permanent magnet linear synchronous motor  

Microsoft Academic Search

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

Hongliang Lu

2011-01-01

366

The neural optimal control hierarchy for motor control  

NASA Astrophysics Data System (ADS)

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

DeWolf, T.; Eliasmith, C.

2011-10-01

367

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

Microsoft Academic Search

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

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

2006-01-01

368

Behavior of three-phase induction motors with variable stator coil winding pitch  

NASA Astrophysics Data System (ADS)

A pulse-width modulation (PWM) inverter and sinusoidal output voltage supplies feeding four different chorded three-phase induction motors were tested for low-order odd voltage harmonic components and efficiency at different loads. The total harmonic distortion due to the third, fifth, and ninth harmonics was lowest in a motor with 160° coil pitch energized by both sinusoidal and PWM voltages. The efficiencies of the motor with the short-chorded winding were as much as 5% and 16% higher than that of the full-pitched motor under sinusoidal and PWM excitation, respectively, due to harmonic cancellation.

Deshmukh, R.; Moses, A. J.; Anayi, F.

2006-04-01

369

A universal simulation model for motor control based on SVPWM  

Microsoft Academic Search

Motors, such as three-phase asynchronous motors, DC generator motors, permanent magnet linear motors, etc. have penetrated almost all of the aspects of industry, agriculture, commerce and daily life nowadays. With the development of modern technology, the direction of control strategies tends to be more and more digitized and efficient. This paper introduces a basic and common control platform, adopting control

Xin Zhou; Jian Xun Jin

2011-01-01

370

Summary of electric vehicle dc motor-controller tests  

NASA Technical Reports Server (NTRS)

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

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

1982-01-01

371

TEFC induction motors thermal models: a parameter sensitivity analysis  

Microsoft Academic Search

With the increasing pressures on electric motor manufacturers to develop smaller and more efficient electric motors, there is a trend to carry out more thermal analysis in parallel with the traditional electromagnetic design. It has been found that attention to thermal design can be rewarded by major improvements in the overall performance. Thus, there is a requirement for accurate and

Aldo Boglietti; Andrea Cavagnino; David A. Staton

2005-01-01

372

Comparison of induction motor field efficiency evaluation methods  

SciTech Connect

Unlike testing motor efficiency in a laboratory, certain methods given in the IEEE-Std 112 cannot be used for motor efficiency in the field. For example, it is difficult to load a motor in the field with a dynamometer when the motor is already coupled to driven equipment. The motor efficiency field evaluation faces a different environment from that for which the IEEE-Std 112 is chiefly written. A field evaluation method consists of one or several basic methods according to their physical natures. Their intrusivenesses and accuracies are also discussed. This study is useful for field engineers to select or to establish a proper efficiency evaluation method by understanding the theories and error sources of the methods.

Hsu, J.S.; Kueck, J.D.; Olszewski, M.; Casada, D.A.; Otaduy, P.J.; Tolbert, L.M.

1996-10-01

373

Sensorless Control of Synchronous Reluctance Motors Based on Extended EMF Models Considering Magnetic Saturation With Online Parameter Identification  

Microsoft Academic Search

A sensorless control method based on novel extended electromotive force (EEMF) models considering magnetic saturation is proposed for synchronous reluctance motors (SynRMs). Since motor parameters, particularly inductances, vary largely in SynRMs, a precise sensorless control is necessary for fully considering such variations. In this paper, the EEMF model, taking into consideration magnetic saturation, is derived and is applied to a

Shinji Ichikawa; Mutuwo Tomita; Shinji Doki; Shigeru Okuma

2006-01-01

374

Electric motor servo control system and method  

SciTech Connect

This patent describes a system for maintaining the speed of a vehicle at a predetermined constant rate by controlling rotation of an electro-servo motor that is coupled to an element moveable between at least two positions by the servo motor for controlling the fuel-air mixture of the vehicle. The servo motor is responsive to a control current produced by a motor drive circuit to move the element. A means is included for interrupting the servo motor operation when the element is relatively immovable. The system comprises: element position indicating means operably coupled to the element for providing a signal having a value which varies with the position of the element; first circuit means for providing a first reference signal having a value representing when the element reaches a first extreme travel position, and for providing a second reference signal having a value representing when the element reaches a second extreme position of travel; and first comparator means operatively coupled to the element position indicating means and the first circuit means for comparing the value of the signal produced by the element position indicating means to the first reference signal and for providing a signal indicating whether the value of the signal from the element position indicating means exceeds the value of the first reference signal.

Burney, C.F.

1987-04-07

375

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

NASA Astrophysics Data System (ADS)

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

Peak, S. C.

1982-09-01

376

Calculation and Measurement of Coil Inductance Profile in Tubular Linear Reluctance Motor and its Validation by Three Dimensional FEM  

NASA Astrophysics Data System (ADS)

This paper reports a study of coil inductance profile in all positions of plunger in tubular linear reluctance motors (TLRMs) with open type magnetic circuits. In this paper, maximum inductance calculation methods in winding of tubular linear reluctance motors are described based on energy method. Furthermore, in order to calculate the maximum inductance, equivalent permeability is measured. Electromagnetic finite-element analysis for simulation and calculation of coil inductance in this motor is used. Simulation results of coil inductance calculation using 3-D FEM with coil current excitation is compared to theoretical and experimental results. The comparison yields a good agreement.

Mosallanejad, Ali; Shoulaie, Abbas

2011-07-01

377

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

378

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

379

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

380

On fuzzy logic speed control for vector controlled AC motors  

Microsoft Academic Search

The paper deals with the fuzzy logic control(ler) (FLC) application to the field-oriented AC motor drive. Some fundamentals of the FLC are illustrated. The aspects of major importance in the application to field-oriented AC motor drives are pointed out and discussed. A FLC field-oriented drive is designed, simulated and experimented in a speed control loop. The results are compared with

D. Fodor; Z. Katona; J. Vass

1996-01-01

381

Design and comparison of an optimized permanent magnet-assisted synchronous reluctance motor (PMa-SynRM) with an induction motor with identical NEMA Frame stators  

Microsoft Academic Search

The performance of a synchronous reluctance motor (SynRM) depends on the direct axis inductance (Ld) and the quadrature axis inductance (Lq) of the machine. To achieve high torque density and power factor, increasing the saliency ratio Ld\\/Lq and making the difference of these inductances (Ld-Lq) large enough are well known methods. Otherwise, the performance of the motor will remain below

Robert Vartanian; Hamid A. Toliyat

2009-01-01

382

Design method of a simplified speed observer for speed sensorless F.O. induction motor drives working at low speed in 4-quadrant mode  

Microsoft Academic Search

In this paper, a design method for a simplified speed observer for a speed sensorless field oriented (F.O.) controlled induction motor drive is proposed. The method is based on the stability analysis of the drive operation, on the torque vs. speed plane. A decoupling control is used to generate the voltage commands from the current commands instead of current regulators.

F. Profumo; G. Griva; A. Tenconi; M. Abrate; M. ChiadO Caponet

1998-01-01

383

Identifying three-phase induction motor faults using artificial neural networks  

PubMed

This paper presents an artificial neural network (ANN) based technique to identify faults in a three-phase induction motor. The main types of faults considered are overload, single phasing, unbalanced supply voltage, locked rotor, ground fault, over-voltage and under-voltage. Three-phase currents and voltages from the induction motor are used in the proposed approach. A feedforward layered neural network structure is used. The network is trained using the backpropagation algorithm. The trained network is tested with simulated fault current and voltage data. Fault detection is attempted in the no fault to fault transition period. Off-line testing results on a 3 HP induction motor model show that the proposed ANN based method is effective in identifying various types of faults. PMID:11106295

Kolla; Varatharasa

2000-01-01

384

Controllable homopolar motor-generator energy storage for application in a fusion power reactor  

Microsoft Academic Search

A scheme for a homopolar motor generator (HMG) with a controllable excitation field is proposed. Such a controlled field will enable the full volt-second capability of the induction coil to be utilized, so that in a Tokamak application one may achieve burn times twice as long compared to the case of a constant-excitation HMG. For a drum type HMG, it

W. Y. Chen; W. E. Toffolo; J. R. Purcell

1976-01-01

385

Simulation Study of AC Motor Speed Sensorless Vector Control System Based on SVPWM  

Microsoft Academic Search

The paper applies the space vector pulse width modulation (SVPWM) algorithm to speed sensorless vector control system according to the theory of space vector pulse width modulation, so as to enhance the stability and the performance of speed sensorless drives. The vector control strategy of the SVPWM voltage source inverter fed induction motor is studied. To testify the correctness and

Hui Jin; Yue-ling Zhao; Da-zhi Wang

2009-01-01

386

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

PubMed

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

Kolla, Sri R; Altman, Shawn D

2007-04-01

387

COMPARISON ON SENSORLESS CONTROL OF SYNCHRONOUS MOTORS  

Microsoft Academic Search

The paper compares two different methods for speed and position estimation in AC permanent magnet synchronous motors vector control applications. The first method implies two observer blocks — one for the speed, and the other for the electrical position, using the voltage equations in the ) q , d ( reference frames. The second method estimates the same variables starting

Radu GIUCLEA; Cristian BOGUS; Liviu KREINDLER

388

A three-phase multilevel converter for high-power induction motors  

Microsoft Academic Search

A new converter topology for drives is presented in this paper: a three-phase multilevel converter with separately regulated DC power supplies. The DC voltages are provided by medium-frequency DC-DC converters. The applications for the converter are especially high-power traction systems, where the voltage applied to the induction motor is bigger than 1 kV. The motor current is of a very

Nikolaus P. Schibli; Tung Nguyen; Alfred C. Rufer

1998-01-01

389

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

390

Novel high-speed induction motor for a commercial centrifugal compressor  

Microsoft Academic Search

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

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

2000-01-01

391

High-Frequency Loss Calculation in a Smooth Rotor Induction Motor Using FEM  

Microsoft Academic Search

In this paper, a new approach for the calculation of high-frequency losses in induction motors is presented. The input to the motors is assumed to be supplied from a sinusoidal voltage source. The method is based on the two-dimensional (2-D) field solutions of the magnetic circuit, obtained by using a nonlinear ldquoharmonicrdquo solution. Hence, the solution time is very short.

H. BÜlent Ertan; K. Leblebicioglu; B. Avenoglu; Murat Pirgaip

2007-01-01

392

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

393

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

394

Motor Control Theories and Their Applications  

PubMed Central

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

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

2010-01-01

395

A universal computer control system for motors  

NASA Technical Reports Server (NTRS)

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

Szakaly, Zoltan F. (inventor)

1991-01-01

396

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

DOEpatents

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

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

1982-01-01

397

Motor control in a Drosophila taste circuit.  

PubMed

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

Gordon, Michael D; Scott, Kristin

2009-02-12

398

Measurement and Real-Time Modeling of Inductance and Flux Linkage in Switched Reluctance Motors  

Microsoft Academic Search

This paper presents a real-time model to identify the inductance and the flux linkage of switched reluctance motors (SRMs). A dynamic measurement method is used for the real-time modeling. An artificial neural network (ANN), designed in accordance with the inductance and the flux linkage data obtained from the dynamic measurement method, is used to make the real-time model. Experimental studies

O. Ustun

2009-01-01

399

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

SciTech Connect

The objectives of this program for an improved ac motor controller for battery powered urban electric passenger vehicles were: the design, fabrication, test, evaluation and cost analysis of an engineering model controller for an ac induction motor drive system, the investigation of a power level expansion to a family of horsepower and battery system voltages, and the investigation of the applicability of the ac controller for use as an on-board battery charger and for providing the function of motor reversal. Additional vehicle specifications, e.g., acceleration and pulling out of potholes, were added to the NASA vehicle specifications. Then, 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 General Electric ac induction motor used in the drive is optimized to operate as a vehicle traction motor with a pulse width modulated (PWM) inverter as a power source. The motor is nominally rated 20 hp and 41 hp peak. The power inverter design is a three-phase transistorized bridge configuration with feedback diodes. The transistors are a special design General Electric high-power Darlington transistor rated 450 volts and 200 amps. The battery system voltage chosen was 108 volts. The control strategy is a constant torque profile by PWM operation to base speed and a constant horsepower profile by square-wave operation to maximum speed. A gear shifting transmission is not required. An advanced current-controlled PWM technique is used to control the motor voltage. The primary feedback control is a motor angle control, with voltage and torque outer loop controls.

Peak, S.C.

1982-09-01

400

Analysis of Fuzzy Control for Permanent Magnet Synchronous Motor  

Microsoft Academic Search

This paper presents the design, analysis and speed control of a permanent magnet synchronous (PMSM) motor with a speed controller to improve the performances of the motor. To reduce torque ripples and improve dynamic performance, a fuzzy controller for permanent magnet synchronous motor drive is presented, which replaces the conventional hysteresis controller. Results of simulation are provided to demonstrate that

H. Soleimani Bidgoli

401

Determination of radial-forces in relation to noise and vibration problems of squirrel-cage induction motors  

Microsoft Academic Search

The radial electromagnetic forces in induction motors play an important role in the production of audible noise and vibrations. The magnetic flux pulsations at the iron surfaces produce these radial forces, which act on the stator and rotor structures. An analysis for the calculation of the various field harmonics and radial forces in squirrel cage induction motors is presented in

S. P. Verma; A. Balan

1994-01-01

402

Detection of rotor slot and other eccentricity related harmonics in a three phase induction motor with different rotor cages  

Microsoft Academic Search

Detection of rotor slot and other eccentricity related harmonics in the line current of a three phase induction motor is important both from the viewpoint of sensorless speed estimation as well as eccentricity related fault detection. However, it is now clear that not all three phase induction motors are capable of generating such harmonics in the line current. Recent research

Subhasis Nandi; Shehab Ahmed; Hamid A. Toliyat

2001-01-01

403

A novel CSI-fed induction motor drive  

Microsoft Academic Search

Current source inverter (CSI) fed drives are employed in high power applications. The conventional CSI drives suffer from drawbacks such as harmonic resonance, unstable operation at low speed ranges, and torque pulsation. This paper presents a novel CSI drive which overcomes all these drawbacks and results in sinusoidal motor voltage and current even with CSI switching at fundamental frequency. The

Abdul Rahiman Beig; V. T. Ranganathan

2006-01-01

404

An Improved Phase Variable Model for Performance Analysis of a PM Claw Pole SMC Motor with Brushless DC Control  

Microsoft Academic Search

This paper presents an improved phase variable model for the performance analysis of a permanent magnet (PM) claw pole motor with soft magnetic composite (SMC) stator core under brushless DC control scheme. For accurate computation of key motor parameters such as back electromotive force (emf), winding inductance, cogging torque and core loss, magnetic field finite element analyses are conducted. The

Youguang Guo; Jiaxin Chen; Jianguo Zhu; Haiwei Lu; Haiyan Lu; Jianxun Jin

2007-01-01

405

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

SciTech Connect

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

Lawler, J.S.

2000-06-23

406

About the Power Generation Confirmation of the Induction Motor and the Influence on the Islanding Detection Device  

NASA Astrophysics Data System (ADS)

The photovoltaic generation system must have protection device and islanding detection devices to connect with utility line of the electric power company. It is regulated in the technological requirement guideline and the electric equipment technology standard that the country provides. The islanding detection device detected purpose install for blackout due to the accident occurrence of the earth fault and the short-circuit in the utility line. When the islanding detection device detects the power blackout, it is necessary to stop the photovoltaic generation system immediately. If the photovoltaic generation system is not stopped immediately, electricity comes to charge the utility power line very at risk. We had already known that the islanding detection device can't detect the islanding phenomenon, if is there the induction motor in the loads. Authors decided to investigate the influence that the induction motors gave to the islanding detection device. The result was the load condition that the induction motors changed generator the voltage is restraining. Moreover, it was clarified that the time of the islanding was long compared with the load condition of not changing into the state of the generator. The value changes into the reactance of the induction motors according to the frequency change after the supply of electric power line stops. The frequency after the supply of electric power line stops changes for the unbalance the reactive power by the effect of the power rate constancy control with PLL of the power conditioner. However, the induction motors is also to the changing frequency, makes amends for the amount of reactive power, and the change in the frequency after the supply of electric power line stops as a result is controlled. When the frequency changed after the supply of electric power line stopped, it was clarified of the action on the direction where it made amends from the change of the constant for the amount of an invalid electric power, and the possession of the characteristic in which the continuance of the individual operation was promoted.

Igarashi, Hironobu; Sato, Takashi; Miyamoto, Kazunori; Kurokawa, Kousuke

407

Induction motors thermal monitoring by means of rotor resistance identification  

Microsoft Academic Search

Rotor and stator temperature are of concern in both short-term machine protection and in longer term condition monitoring for large induction machines. Especially, when operating with overload cycles, it is necessary to monitor rotor bars and stator winding temperatures to make sure that the temperature remains below prescribed limits. The purpose of this paper is to present a thermal monitoring

R. Beguenane; M. E. H. Benbouzid

1999-01-01

408

Motor de Passo Circuito de Controle (Circuit for Actuation of a Stepping Motor).  

National Technical Information Service (NTIS)

A system of actuation and control of a stepping motor was developed for use in laboratory crystal growth and optical characterization of radiation sensors. A stepping motor (Digimotor Model DM27) was utilized. Its torque characteristics, velocity, and pos...

L. C. Russo

1988-01-01

409

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

410

A computer program to predict the performance of slip energy recovery induction motor drives  

Microsoft Academic Search

Details are provided, in the form of a flowchart, to permit the reconstruction of a computer program to predict the transient and steady-state performance of slip energy recovery induction motor (IM) drives. Slip energy recovery IM drives are different from most other drives in that the inverter is generally connected only after the machine has reached a predetermined speed. The

E. Akpinar; P. Pillay

1990-01-01

411

Calculation of slip energy recovery induction motor drive behavior using the equivalent circuit  

Microsoft Academic Search

A transformer-type equivalent circuit model for the calculation of the steady state performance of a slip energy recovery induction motor drive with a step down chopper in the DC link is described. Experimental data of RMS currents, power, reactive power and overall efficiency satisfactorily correlate with calculations over most of the operating speed range. Also, detailed calculations of rotor, stator

Pragasen Pillay; Larbi Refoufi

1994-01-01

412

Electric monorail system with magnetic levitations and linear induction motors for contactless delivery applications  

Microsoft Academic Search

In recent semiconductor and display manufac- turing processes, high clean-class delivery operation is required more and more for short working time and better product quality. Traditionally single-sided linear induction motor (SLIM) is widely used in the liner drive applications because of its simplicity in the rail structure. A magnetically levitated (Maglev) unmanned vehicle with SLIM traction, which is powered by

Ki-Chang Lee; Ji-Woo Moon; Min-Cheol Lee; Jong-Moo Kim; Ji-Won Kim; Dae-Hyun Koo

2011-01-01

413

Fuzzy Detection and Diagnosis of Fault Modes in a Voltage-Fed PWM Inverter Induction Motor  

Microsoft Academic Search

This paper describes a fuzzy-based method of fault detection and diagnosis in a PWM inverter feeding an induction motor. The proposed fuzzy approach is a sensor-based technique using the mains current measurement to detect intermittent loss of firing pulses in the inverter switches. A localization domain made with seven patterns is built with the stator Concordia current vector. One is

F. Zidani; D. Diallo; M. E. H. Benbouzid; R. Nait-Said

2005-01-01

414

Research of an Energy-Fed Induction Motor Driving Test Platform with Double Inverters for HEV  

Microsoft Academic Search

As conventional test platform of induction motor used in hybrid electric vehicle is deficient in energy consumption, this paper proposes a kind of energy-fed test platform with two inverters which are linked by DC bus. Analysis and evaluation are given from energy consumption ratio, power factor and additional equipment capacity, And validity of the test platform is proved by experiment.

Song Liwei; Li Zijian; Zhang Qianfan; Fu Jianfu; Wang Fuping

2007-01-01

415

A transputer-based speed identifier for induction motor drives using real-time adaptive filtering  

Microsoft Academic Search

A novel sensorless speed identifier for induction motor drives is proposed. It is based on the real-time calculation of rotor slot harmonics (RSHs) using an adaptive digital filter. It outperforms any other analogue or spectrum-based speed identifier in terms of accuracy and speed of response. The new identifier measures the speed, by processing two stator currents, with an accuracy better

A. Ferrah; K. J. Bradley; P. J. Hogben; M. S. Woolfson; G. M. Asher

1996-01-01

416

Computer-Aided Design of Linear Induction Motors With Edge Effects.  

National Technical Information Service (NTIS)

The design of linear induction motors on a digital computer is studied. Design equations are given and an equivalent circuit is derived to aid the design. Using the design equations, a computer program is written to calculate the parameters in the equival...

S. A. Nasar J. S. Nelsen

1970-01-01

417

Load modeling of an induction motor operated with a variable frequency drive  

Microsoft Academic Search

Knowledge of load characteristics and load modeling is a necessary tool for adequate voltage stability analysis. This paper presents experimental tests of an off-the-shelf variable frequency drive feeding an induction motor and shows how this load draws power from the grid and its effect on the voltage stability. A description and simulation of the drive is provided to understand the

León Max Vargas; Juri Jatskevich; José R. Martí

2008-01-01

418

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

PubMed Central

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

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

2012-01-01

419

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

420

Predetermination of Sound Pressure Levels of Magnetic Noise of Polyphase Induction Motors  

Microsoft Academic Search

This paper gives a general procedure for calculating in decibels the slot frequency sound pressure level produced by a polyphase induction motor operating at any arbitrary speed and load. To do this, it is necessary, first, to calculate the frequencies, pole numbers, and magnitudes of the important air-gap magnetic fields; second, to calculate from these the frequencies and magnitudes of

E. Erdelyi

1955-01-01

421

On-line stator and rotor resistance estimation for induction motors  

Microsoft Academic Search

A ninth-order estimation algorithm is designed which provides online exponentially convergent estimates of both rotor and stator resistance for induction motors, when persistency of excitation conditions are satisfied and the stator current integrals are bounded, on the basis of rotor speed, stator voltages, and stator current measurements. Rotor flux is also asymptotically recovered. Experimental tests are reported which show that:

Riccardo Marino; Sergei Peresada; Patrizio Tomei

2000-01-01

422

Induction motor fault diagnosis based on the k-NN and optimal feature selection  

Microsoft Academic Search

The k-nearest neighbour (k-NN) rule is applied to diagnose the conditions of induction motors. The features are extracted from the time vibration signals while the optimal features are selected by a genetic algorithm based on a distance criterion. A weight value is assigned to each feature to help select the best quality features. To improve the classification performance of the

Ngoc-Tu Nguyen; Hong-Hee Lee

2010-01-01

423

Stability Analysis of Speed and Stator Resistance Estimators for Sensorless Induction Motor Drives  

Microsoft Academic Search

This paper presents an analysis by which the stability of a multiple-input-multiple-output system of simultaneous speed and stator resistance estimators for sensorless induction motor drives can be successfully predicted. The instability problem of an adaptive flux observer (AFO) is deeply investigated. In order to achieve stability over a wide range of operation, a design of the observer feedback gain is

Mohamed S. Zaky

2012-01-01

424

Position control of a PM stepper motor by exact linearization  

Microsoft Academic Search

The authors consider the position control of a permanent magnet (PM) stepper motor using the exact linearization method. This nonlinear controller takes into account the full dynamics of the stepper motor. In particular, the phase shift between voltage and current in each phase is automatically taken into account. The feedback linearization controller makes the stepper motor into a fast accurate

M. Zribi; J. Chiasson

1991-01-01

425

Novel Control Strategies For Photovoltaic Powered PMDC Motor Drives  

Microsoft Academic Search

This paper presents a novel PID dual loop controller for a solar photovoltaic (PV) powered industrial type permanent magnet DC (PMDC) motor drive, which is modeled to include existing nonlinearities in motor plus load inertia (J) and viscous friction (B). The proposed dual loop includes a speed control as the dominant control loop and a supplementary motor current limiting loop

A. M. Sharaf; E. Elbakush; I. H. Altas

2007-01-01

426

Dual-circuit segmented rail phased induction motor  

DOEpatents

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

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

2002-01-01

427

Direct AC-AC converter and its applications to induction motor drives  

SciTech Connect

Several modulation schemes are used to reduce the harmonic content in a direct ac-ac converter. A new modulation scheme using a clipped sine reference is proposed and the harmonic content with this scheme is found to be lower. The performance of a three-phase induction motor fed by a direct ac-ac converter is analyzed using the equivalent-circuit model as well as the dynamic equations referred to a frame fixed to the stator. Operation of a bipolar direct ac-ac converter with high input utilization is studied. The performance of a single-phase induction motor fed by such a converter is analyzed using an equivalent-circuit model. The direct ac-ac converter makes us of several bilateral switches which enable both motoring and regeneration. A practical realization using power MOSFETs is given.

Khoei, A.

1989-01-01

428

Optimization of single-phase induction motor design. Part I: Formulation of the optimization technique  

SciTech Connect

The optimal design of the motor dimensions, the capacitance of the run capacitor, the winding distribution and the choice of the electrical steel are the most important sources for an improvement of the efficiency of modern single-phase induction motors for given performance and material cost constraints. The formulation of the techniques which realize this optimization is dealt with in Part I of this two part paper, based on nonlinear programming approaches. A comparative study for both the Method of Boundary Search Along Active Constraints and the Han-Powell Method is performed from a theoretical convergence and practical application point of view in order to develop the best method for the optimization of single-phase induction motor designs.

Huang, H.; Fuchs, E.F.; Zak, Z.

1988-06-01

429

Development of Inverters with Forced Commutation for AC Motor Speed Control up to the Megawatt Range  

Microsoft Academic Search

The stages of development of inverters with forced commutation up to the megawatt range are described. The significant circuit designs such as capacitor turnoff, feedback diodes, and commutation inductances are already known from the mercury-arc and thyratron era. With the development of inverter-type thyristors today, inverters up to several hundred kilowatts can be realized for speed control of ac motors.

Klemens Heumann

1969-01-01

430

Influence analysis of structural parameters and operating parameters on electromagnetic properties of HTS linear induction motor  

NASA Astrophysics Data System (ADS)

A novel High Temperature Superconductor Linear Induction Motor (HTS LIM) is researched in this paper. Since the critical current and the electromagnetic force of the motor are determined mainly by the primary slot leakage flux, the main magnetic flux and eddy current respectively, in order to research the influence of structural parameters and operating parameters on electromagnetic properties of HTS LIM, the motor was analyzed by 2D transient Finite Element Method (FEM). The properties of the motor, such as the maximum slot leakage flux density, motor thrust, motor vertical force and critical current are analyzed with different structural parameters and operating parameters. In addition, an experimental investigation was carried out on prototype HTS motor. Electrical parameters were deduced from these tests and also compared with the analysis results from FEM. AC losses of one HTS coil in the motor were measured and AC losses of all HTS coils in HTS LIM were estimated. The results in this paper could provide reference for the design and research on the HTS LIM.

Fang, J.; Sheng, L.; Li, D.; Zhao, J.; Li, Sh.; Qin, W.; Fan, Y.; Zheng, Q. L.; Zhang, W.

431

Function-Based Controller for Linear Motor Control Systems  

Microsoft Academic Search

This paper presents a new methodology for designing and implementing position control for permanent-magnet linear synchronous motor (PMLSM) systems. We utilize both a new function-based sliding-mode control (SMC) method and direct thrust control (DTC). It has been established that chattering is a problem in conventional SMC and stems from discontinuous control. However, the new function-based controller allows designers to employ

Yi-Sheng Huang; Cheng-Chung Sung

2010-01-01

432

Four Phase Switched Reluctance Motor Direct Torque Control  

Microsoft Academic Search

The three-phase switched reluctance motor direct torque control method mostly is a simple transplantation of the three-phase AC asynchronous motor direct torque control method, not suitable for arbitrary-phase switched reluctance motor. In this paper, the direct torque control method for the application of a wide range of four-phase switched reluctance motor will be researched, the structural methods of a four-

Wang Mianhua

2011-01-01

433

Comparison of Performance Characteristic of Squirrel Cage Induction Motor by Three Phase Sinusoidal and PWM Inverter Supply Using MATLAB Digital Simulation  

Microsoft Academic Search

Induction motors are the most widely used electric motors in industry. They offer reasonable performance, a manageable torque-speed curve, stable operation under load and satisfactory efficiency. The aim of the paper is to investigate the performance characteristic of available squirrel cage induction motor. Simulation and experimental results are presented and compared to validate the mathematical model of motor. The purpose

P. S. Chaudhari; Pradeep M. Patil; Sharad S. Patil; P. P. Kulkarni; R. M. Holmukhe

2010-01-01

434

Molecular Pathways Controlling Pancreas induction  

PubMed Central

Recent advances in generating pancreatic cell types from human pluripotent stem cells has depended on our knowledge of the developmental processes that regulate pancreas development in vivo. The developmental events between gastrulation and formation of the embryonic pancreatic primordia are both rapid and dynamic and studies in frog, fish, chick, and mouse have identified the molecular basis of how the pancreas develops from multipotent endoderm progenitors. Here, we review the current status of our understanding of molecular mechanisms that control endoderm formation, endoderm patterning, and pancreas specification and highlight how these discoveries have allowed for the development of robust methods to generate pancreatic cells from human pluripotent stem cells.

McCracken, Kyle W.; Wells, James M.

2012-01-01

435

Spinal motor control differences between the sexes.  

PubMed

Activity-related knee joint dysfunction is more prevalent in females than males. One explanation for the discrepancy is differences in movement patterns between the sexes. However, the underlying mechanisms responsible for these differences remain unidentified. This study tested spinal motor control mechanisms influencing motor neuron pool output and subsequent muscle activation in 17 males and 17 females. The following variables were assessed at the soleus: the gain of the unconditioned H-reflex, gain of both intrinsic pre-synaptic inhibition (IPI) and extrinsic pre-synaptic inhibition (EPI), the level of recurrent inhibition (RI), the level of supraspinal drive determined by the ratio of the Vmax:Mmax (V-wave), electromechanical delay (EMD) and the rate of force development (RFD). The Wilks Lambda multivariate test of overall differences among groups was significant (p = 0.031). Univariate between-subjects tests revealed males had greater RI (p = 0.042). However, the sexes did not differ on any of the other variables tested. In conclusion, the sexes differ on modulation of spinal motor control. Specifically, RI, a post-synaptic regulator of force output, was greater in males. PMID:22399160

Johnson, Samuel T; Kipp, Kristof; Hoffman, Mark A

2012-11-01

436

Balanced-Bridge Feedback Control Of Motor  

NASA Technical Reports Server (NTRS)

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

Lurie, Boris J.

1990-01-01

437

Position Sensorless Speed Estimation in Switched Reluctance Motor Drive with Direct Torque Control  

NASA Astrophysics Data System (ADS)

Feedback signals of rotor speed and motor torque are essential in most of Switched Reluctance (SR) motor control applications. An SR motor has highly nonlinear characteristic that does not allow to be modeled by simple equations. In Direct Torque Control (DTC) drive, which enables easy control of torque ripple in the SR motor, position sensor is employed to obtain the feedback signals. Position sensor causes DTC drive not only less reliable but also more expensive. Estimation of feedback signals is required in order to eliminate position sensor. This paper concerns about sensorless speed estimation under the DTC condition and presents a simple method. Simple sensorless speed estimation is proposed based on inductance vector angle. The inductance vector angle is obtained by applying ?-? transformation to the phase inductances. A relay triggers a speed calculation circuit according to its band limits and the inductance vector angle. Inside the circuit, triggering time is kept in a memory until the next triggering. Rotor pole pitch is divided by the time difference between two consecutive triggerings. Finally, the estimation circuit outputs the rotor speed. Sensorless speed estimation is simulated and verified experimentally to show its validity.

Kucuk, Fuat; Goto, Hiroki; Guo, Hai-Jiao; Ichinokura, Osamu

438

Hot gas thrust vector control motor  

NASA Astrophysics Data System (ADS)

A hot gas thrust vector control (HGTVC) motor developed in the framework of a Foreign Weapon Evaluation program is discussed. Two HGTVC versions were evaluated on the two nozzles of the program, normal injection with a blunt pintle and 10 deg upstream injection with a tapered pintle. The HGTVC system was tested on a modified ORBUS-1 motor which is based on two technologies, namely, a composite chamber polar boss (CPB) and a two-piece C-C nozzle which threads to the CPB and receives two HGVs embedded into its exit cone, 180 deg apart. It is concluded that the composite polar bosses and C-C nozzles performed successfully in both firings.

Berdoyes, Michel; Ellis, Russell A.

1992-07-01

439

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.

440

A simulation technique for a thyristor-controlled motor  

Microsoft Academic Search

A procedure for setting up and solving a digital model of a brushless motor controlled by semiconductor devices (thyristors), with the aid of tensor analysis, is outlined. The procedure can be extended to application to any kind of brushless motor under different sets of operating conditions and with different modes of asymmetry in control or in motor performance parameters. The

T. M. Kazi-Zade

1976-01-01

441

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

442

Mathematical Model Associated to Three-Phase Induction Servomotors in the Case of Scalar Control  

Microsoft Academic Search

Scalar control of induction servomotors was implemented on their steady-state model. If the machine is powered via a frequency and voltage converter, due to the presence in the motor input voltage wave of higher time harmonics, both its parameters and functional characteristic values will be more or less different comparing to the case of sinusoidal supply. The presence of these

SORIN MUSUROI; CIPRIAN SORANDARU; VALERIU-NICOLA OLARESCU; MARCUS SVOBODA

2009-01-01

443

Sensor fault tolerant control of doubly fed induction machines using multiple switching mechanisms  

Microsoft Academic Search

We propose a new strategy for sensor fault tolerant control of rotor wound induction motors operating as stand alone generators. The strategy employs three switching mechanisms that detect faults in, respectively, rotor current sensors, stator current sensors and stator voltage sensors. Each of the switching mechanisms receives measurements from the three phases and builds three residual quantities by combining these

Monica E. Romero; Maria M. Seron

2011-01-01

444

Direct torque control of PWM inverter-fed AC motors - a survey  

Microsoft Academic Search

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

Giuseppe S. Buja; Marian P. Kazmierkowski

2004-01-01

445

Spatial constancy mechanisms in motor control.  

PubMed

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

2011-02-27

446

Intelligent speed control of interior permanent magnet synchronous motors  

Microsoft Academic Search

Precise control of the permanent magnet synchronous motor over wide speed range is an engineering challenge. This paper considers the design and implementation of two novel techniques of speed control for an interior permanent magnet synchronous motor using hybrid current and artificial neural network controllers. The intelligent hybrid controller which is a combination of the hysteresis current controller for high

M. A. Rahman; M. N. Uddin; T. S. Radwan; M. A. Hoque

1998-01-01

447

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

448

An induction motor model for high-frequency torsional vibration analysis  

NASA Astrophysics Data System (ADS)

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

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

2006-03-01

449

A New Modulation Strategy for Unbalanced Two Phase Induction Motor Drives Using a Three-Leg Voltage Source Inverter  

NASA Astrophysics Data System (ADS)

This paper proposes a new modulation scheme providing unbalanced output terminal voltages of a standard three-leg voltage source inverter (VSI) for unsymmetrical type two-phase induction motors. This strategy allows a control method of the output voltages with typically constant V/Hz for a main winding and with voltage boost to compensate magnitude of current for an auxiliary winding. Harmonic voltage characteristics and the motor performance are investigated under a wide range of operating conditions. Practical verification is presented to confirm correctness and capabilities of the proposed technique. All results are compared to those of a conventional two-leg half bridge topology. The results show that the simulation results well agree with the experimental ones, and also the proposed scheme is superior to the conventional drive.

Sinthusonthishat, S.; Kinnares, V.

450

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

451

Fault analysis for condition monitoring of induction motors  

NASA Astrophysics Data System (ADS)

Recently, research has picked up a fervent pace in the area of fault diagnosis of electrical machines. Like adjustable speed drives, fault prognosis has become almost indispensable. The manufacturers of these drives are now keen to include diagnostic features in the software to decrease machine down time and improve salability. Prodigious improvement in signal processing hardware and software has made this possible. Primarily, these techniques depend upon locating specific harmonic components in the line current, also known as motor current signature analysis (MCSA). These harmonic components are usually different for different types of faults. However, with multiple faults or different varieties of drive schemes, MCSA can become an onerous task as different types of faults and time harmonics may end up generating similar signatures. Thus, other signals such as speed, torque, noise, vibration, etc., are also explored for their frequency contents. Sometimes, altogether different techniques such as thermal measurements, chemical analysis, etc., are also employed to find out the nature and the degree of the fault. It is indeed evident that this area is vast in scope. Going by the present trend, human involvement in the actual fault detection decision making is slowly being replaced by automated tools such as expert systems, neural networks, fuzzy logic based systems; to name a few. However, this cannot be achieved without detailed fault analysis and subsequent recognition of the fault pattern. Keeping this in mind, simulation studies of the broken bar and eccentricity related faults using MCSA have been taken up. Also, a common theoretical basis for the different types (static, dynamic and mixed) of eccentricity related faults which give different signatures for different pole and rotor bar combinations has been developed. This will be of great importance both from fault diagnosis as well as sensorless drive applications' viewpoint. Finally, the insight gained from the analysis of eccentricity related faults leads to a novel detection technique of stator inter-turn faults by analyzing the frequency content of the transient line to line voltage, after the motor is switched off.

Nandi, Subhasis

452

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

453

The Basal Ganglia and Adaptive Motor Control  

NASA Astrophysics Data System (ADS)

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

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

1994-09-01

454

Time-optimal control of a stepping motor  

Microsoft Academic Search

Time-optimal control for multiple stepping of a variable-reluctance type stepping motor is discussed. A controller with phase-position feedback is designed and built for the minimum-time control of the motor. Experimental results showed that the controlled motor is capable of traveling a prescribed number of steps in near minimum time by the injection of one or two single pulses and the

B. Kuo; R. Yackel; G. Singh

1969-01-01

455

Variable Rail Voltage Control of a Brushless DC (BLDC) Motor.  

National Technical Information Service (NTIS)

A brushless DC (BLDC) motor achieves higher energy efficiency and endures less wear and tear than a traditional brushed DC motor due to the lack of friction between current coils and motor brushes; it requires additional control logic, however, often impl...

J. Conroy W. Nothwang Y. Chen

2013-01-01

456

Modeling and Analysis of Human Motor Control and Learn ing  

Microsoft Academic Search

with an amazing repertoire of motor skills. Despite being outfitted with what by many engineering criterion are noisy signals, slow computation times, devastating transmission delays and marginal actuators, the human system exhibits motor control and, more impressively, motor learning that far surpass our best engineering efforts. We seek a better understanding of how this is accomplished. Motivation: With a clear

Max Berniker; Steve G. Massaquoi

457

Compliance control of an ultrasonic motor powered prosthetic forearm  

Microsoft Academic Search

The capability of a prosthetic device to mimic the response of the actual limb with respect to voluntary motor commands and to environmental loads should be addressed. This paper discusses the compliance control of an ultrasonic motor powered prosthetic forearm which utilizes cutaneously measured electromyogram (EMG) signals sensed with electrodes over the muscles as means of detecting motor commands sent

Mervin PECSON; Koji ITO; Zhi-Wei Luo; Atsuo KATO; Takashi AOYAMA; Masami ITO

1993-01-01

458

ACTIVE CONTROL STICK DRIVEN BY A PIEZO ELECTRIC MOTOR  

Microsoft Academic Search

An Active Control Stick (ACS) realized by a travelling wave type ultrasonic motor (USM) is presented. In contrast to the conventional side stick in modern aircrafts, which is only operated by a passive mechanic feedback, forces can be reproduced artificially by an active con- trol stick. Ultrasonic motors are more compact as conventional electrical geared motors and combine features such

T. Schulte; H. Grotstollen; H.-P. Schöner; J.-T. Audren

1999-01-01

459

Synchronous AC motors for process control over wide speed ranges  

Microsoft Academic Search

Applications of alternating current (AC) motors require precise speeds for control of certain processes such as synthetic fiber spinning, plastic sheet, films and glass manufacturing. Historically, the synchronous reluctance (SR) motor, with its aluminum die cast rotor, has served this need. In the past decade, selection of permanent magnet (PM) motors often yielded higher efficiencies and other performance advantages. Criteria

R. Pettit; P. Wagner; K. Shaw

1988-01-01

460

Split-phase induction motor operation from PWM voltage source inverter  

Microsoft Academic Search

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

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

1993-01-01

461

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

462

Design of single-sided linear induction motors for urban transit  

Microsoft Academic Search

A method of designing low-speed single-sided linear induction motors (SLIMs) for urban transit with maximum speed of 70 km\\/h is described. The SLIMs can be used not only for Maglev vehicles, but also for the vehicles of the LIM\\/wheel systems in which the SLIMs are used for propulsion and the wheels for suspension and guidance. The effects of varying principal

SAKUTARO NONAKA; TSUYOSHI HIGUCHI

1988-01-01

463

3-D electro-magnetic analyses of a cage induction motor with rotor skew  

Microsoft Academic Search

The paper studied the performance characteristics of a three-phase cage induction motor using a 3D finite element technique. Especially, the effects of rotor skew and the rotor end-rings and the distribution of the electromagnetic field toward the axial direction, which have not been able to be analyzed accurately by 2D analysis, were investigated. Since the 3D analysis enabled the analysis

H. Kometani; S. Sakabe; K. Nakanishi

1996-01-01

464

3-D Finite Element Analysis of Additional Eddy Current Losses in Induction Motors  

Microsoft Academic Search

In this paper, an approach based on the three-dimensional finite element analysis is proposed to evaluate additional eddy current losses in induction motors of several MW. Losses produced by induced eddy currents in the end-region of the machine (stator clamping-plates and clamping-fingers) and losses provoked by parasitic leakage fields in the housing and in the metal parts of the cooling-ducts

Andrej Stermecki; Oszkár Biro; Imam Bakhsh; Siegfried Rainer; Georg Ofner; Reinhard Ingruber

2012-01-01

465

Design of a back-to-back multilevel induction motor drive for traction systems  

Microsoft Academic Search

This paper deals with the design of a single phase AC\\/DC\\/AC converter feeding an induction motor for traction applications. A cascade of H-bridge cells has been used to obtain a multilevel conversion structure. The front-end rectifier should absorb current with low harmonic content to eliminate disturbances on the communication equipments and, more in general, to reduce electromagnetic pollution. Additional specification

A. Dell'Aquila; Marco Liserre; Vito G. Monopoli; C. Cecati

2003-01-01

466

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

467

Push-Pull Control of Motor Output  

PubMed Central

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

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

2012-01-01

468

DSP-based adaptive control of a brushless motor  

Microsoft Academic Search

The software control of a brushless DC motor with parameter identification is presented. Not only speed and current controls but also a real-time identification of the motor parameters can be implemented by software using the digital signal processor (DSP) TMS320C25. The unique current control is performed according to an instantaneous voltage equation of a d-q model of the motor. Because

N. Matsui; H. Ohashi

1992-01-01

469

Modeling and performance of slip energy recovery induction motor drives  

Microsoft Academic Search

This program can be used to examine the transient performance of slip energy recovery drives for the proper rating of semiconductor devices or to examine the effects of faults on the associated power system on the drive performance. Current and speed controllers designed using linear techniques can be evaluated using this program as well. A computer using a fourth-order Runga-Kutta

E. Akpinar; P. Pillary

1990-01-01

470

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

471

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.

472

A Reconfigurable Motor for Experimental Emulation of Stator Winding Interturn and Broken Bar Faults in Polyphase Induction Machines  

Microsoft Academic Search

The benefits and drawbacks of a 5-hp reconfigurable induction motor, which was designed for experimental emulation of stator winding interturn and broken rotor bar faults, are presented in this paper. It was perceived that this motor had the potential of quick and easy reconfiguration to produce the desired stator and rotor faults in a variety of different fault combinations. Hence,

Chia-Chou Yeh; Gennadi Y. Sizov; Ahmed Sayed-Ahmed; Nabeel A. O. Demerdash; Richard J. Povinelli; Edwin E. Yaz; Dan M. Ionel

2008-01-01

473

Motor controller for electrical submersible pumps  

Microsoft Academic Search

This patent describes a method for measuring differential pump fluid power output. It comprises: measuring pump motor power consumption at timed intervals; determining a recent pump motor power consumption from the measurements; determining a previous pump motor power consumption from the measurements; and shutting the pump down when the differential exceeds a predetermined amount for a predetermined length of time.

D. R. Jr. Snyder; J. H. Haws

1991-01-01

474

Motor controller for electrical submersible pumps  

SciTech Connect

This patent describes a method for measuring differential pump fluid power output. It comprises: measuring pump motor power consumption at timed intervals; determining a recent pump motor power consumption from the measurements; determining a previous pump motor power consumption from the measurements; and shutting the pump down when the differential exceeds a predetermined amount for a predetermined length of time.

Snyder, D.R. Jr.; Haws, J.H.

1991-05-14

475

An adaptive PID learning control of DC motors  

Microsoft Academic Search

With only the classical PID controller applied to control of a DC motor, a good (target) performance characteristic of the controller can be obtained, if all the model parameters of DC motor and operating conditions such as external load torque, disturbance, etc, are exactly known. However, in case when some of system parameters or operating conditions are uncertain or unknown,

Seung-Min Baek; Tae-Yong Kuc

1997-01-01

476

Sensorless control of AC motors at zero speed  

Microsoft Academic Search

The paper presents a review of the main approaches to sensorless control of AC motor drives, pointing out the problems related to zero speed operations. A general sensorless vector control technique able to drive different kinds of AC motors at low and zero speed is then presented. The proposed control scheme exploits the anisotropy of the machines and does not

Alfio Consoli; Giuseppe Scarcella; Antonio Testa

1999-01-01

477

Rotation speed controller for AC motor drives with frequency converters  

Microsoft Academic Search

The paper presents a controller for AC motor drives with frequency converters. It controls output frequency of the converter and in such a way-rotation speed of the motor according to the sensor signals to keep the given value of some parameter of the system, e.g. water pressure in water pump outlet, constant. The suggested controller is based on comparators and

A. Baskya; V. Gobia

1999-01-01

478

Application of nonlinear observers for rotor position detection on an induction motor using machine voltages and currents  

Microsoft Academic Search

The principles and operation of a unique, terminal properties-based speed and position sensing approach for induction machines are demonstrated. A closed-loop nonlinear observer is proposed which uses an analytical model to calculate, in real time, the mechanical states of rotor speed and position given the torque command to the system and the induction motor terminal voltages and line currents. The

Robert M. Cuzner; Robert D. Lorenz; Donald W. Novotny

1990-01-01

479

Identification of rotor position and speed of standard induction motors at low speed including zero stator frequency  

Microsoft Academic Search

The total leakage inductance as seen from the stator windings of standard induction motors varies with the rotor position angle. The effect is exploited to extract the rotor position, and speed, from measured stator voltages. The extraction algorithm is incorporated based on a modification of the pulsewidth modulator. Experimental results demonstrate accurate position measurement at high resolution and high bandwidth

Joachim Holtz; Jinsheng Jiang; Hangwen Pan

1997-01-01

480

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.

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

2014-01-01

481

Debris control design achievements of the booster separation motors  

NASA Technical Reports Server (NTRS)

The stringent debris control requirements imposed on the design of the Space Shuttle booster separation motor are described along with the verification program implemented to ensure compliance with debris control objectives. The principal areas emphasized in the design and development of the Booster Separation Motor (BSM) relative to debris control were the propellant formulation and nozzle closures which protect the motors from aerodynamic heating and moisture. A description of the motor design requirements, the propellant formulation and verification program, and the nozzle closures design and verification are presented.

Smith, G. W.; Chase, C. A.

1985-01-01

482

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

483

75 FR 11878 - California State Motor Vehicle Pollution Control Standards; Amendments to the California Zero...  

Federal Register 2010, 2011, 2012, 2013

...relating to the control of emissions from new motor vehicles or new motor vehicle...relating to the control of emissions from any new motor vehicle or new motor vehicle...for the control of emissions from new motor vehicles or new motor...

2010-03-12

484

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

485

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

486

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

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

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

487

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

488

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

489

Proprioception and motor control in Parkinson's disease.  

PubMed

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 is structured around 4 themes: (a) It examines whether the sensitivity of kinaesthetic perception, which is based on proprioceptive inputs, is actually altered in PD. (b) It discusses whether failed processes of proprioceptive-motor integration are central to the motor problems in PD. (c) It presents recent findings focusing on the link between the proprioception and the balance problems in PD. And (d) it discusses the current state of knowledge of how levodopa medication and deep brain stimulation affect proprioceptive and motor function in PD. The authors conclude that a failure to evaluate and to map proprioceptive information onto voluntary and reflexive motor commands is an integral part of the observed motor symptoms in PD. PMID:19592360

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

2009-11-01

490

Motor control, habits, complex motor stereotypies, and Tourette syndrome.  

PubMed

Tourette syndrome (TS) and primary complex motor stereotypies (CMS) are two relatively common, distinctly different movement disorders of childhood. Despite their frequency, the precise underlying pathophysiological mechanism(s) for tics and stereotypies remains unknown. Both are likely to involve cortical-striatal-th