• Title/Summary/Keyword: Flux weakening

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A New Robust SPMSM Control to Parameter Variations in Flux Weakening Region (약계자 영역에서 전동기 상수변동에 둔감한 SPMSM의 새로운 약계자 제어기)

  • Kim, Jang-Mok;Song, Jong-Hwan;Seol, Seung-Gi
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.48 no.5
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    • pp.264-268
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    • 1999
  • A new implementation strategy for the flux weakening control of a Surface Mounted Permanent Magnet Synchronous Motor (SPMSM) is proposed. It is implemented based on the output of the synchronous PI current regulator-reference voltage to PWM inverter. The onset of flux weakening and the level of the d-axis current are adjusted by the outer voltage regulation loop to prevent the saturation of the current regulator. The characteristics of this flux weakening scheme include no dependency on the machine parameters, the guarantee of current regulation on any operating condition, and fast transition into and out of the flux weakening mode. Experimental results at various operating conditions including 4-quadrant operation are presented to verify the feasibility of the proposed control scheme.

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A Study on Boost/Flux-Weakening Controller for Wide Speed Operation Range having Engine and IPMSG for Special Equipment Vehicle (특수차량용 엔진 직결형 IPMSG의 넓은 속도운전 범위를 위한 부스트/약자속 제어기에 관한 연구)

  • Lee, Sang-Geon;Kim, Sung-An;Cho, Yun-Hyun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.8
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    • pp.54-61
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    • 2014
  • This paper proposes a boost/flux-weakening controller (BFWC) for wide speed operation range having engine and interior permanent magnet synchronous generator (IPMSG) for special equipment vehicle. The proposed BFWC exploits direct torque/flux control (DTFC) scheme based on space vector modulation method to control the constant DC voltage output within the entire speed operation range of engine. And, to improve the response characteristics of maximum torque per ampere (MTPA) operation and flux-weakening operation, the MTPA and flux-weakening feed-forward controllers are applied. To estimate feasibility and usefulness of the proposed controller, the simulation and experimental results are compared.

Maximum Torque Operation of Interior Permanent Magnet Synchronous Motor in Flux-Weakening Control

  • Kim, Jan-Mok;Rhew, Hong-Woo;Kwon, Jung-Lock;Sul, Seung-Ki
    • Journal of Electrical Engineering and information Science
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    • v.3 no.1
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    • pp.103-109
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    • 1998
  • A new flux-weakening scheme for an Interior Permanent Magnet Synchronous Motor (IPMSM) is proposed. This control scheme enables the maximum torque operation for the fast acceleration in the constant power region according to the current and voltage limit condition. Especially the dynamic performance of the braking in the flux-weakening region is improved with the compensation of the stator resistance. Also since the onset of the flux weakening operation is adjusted according to the load conditions, the machine parameters, and whether motoring or braking region, the stable and precise transition operation into or out of the flux weakening region can be achieved. The effectiveness of the proposed scheme is verified through experiments with an IPMSM drive system.

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Flux Weakening Control for Surface Mounted Permanent Magnet Synchronous Machine Driven by Dual Inverter (이중 인버터를 이용한 표면 부착형 영구자석 동기전동기의 약자속 제어)

  • Kim, Youngnam;Lee, Yongjae;Ha, Jung-Ik
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.5
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    • pp.437-442
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    • 2013
  • For open-end permanent magnet synchronous machine(PMSM) with dual inverter system, where one inverter is connected to the source and the other is flying, the dc link voltage of the flying inverter can be boosted through the machine. For this reason, when compared with single inverter drive system, higher voltage can be applied to PMSM, and higher torque can be generated in the flux weakening region. In this case, however, active and reactive powers are separately supplied by each inverter to maintain the dc link voltage of flying inverter. Therefore, the required flux weakening control is different from the conventional method for a single inverter drive system. This paper proposes the novel flux weakening control method which maximizes the active voltage component in a dual inverter PMSM drive system. The proposed method was demonstrated and verified through experimental results.

A Driving Torque Prediction of Brushless DC Motor by Using the Measured Current Data (전류측정 데이터를 이용한 브러쉬 없는 직류전동기의 구동토크 예측)

  • 변영철;전혁수
    • Journal of the Korea Institute of Military Science and Technology
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    • v.2 no.2
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    • pp.242-250
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    • 1999
  • This paper presents an estimation scheme of the external torque applied on the motor by using measured motor input current when the IPM(Interior Permanent Magnet) rotor type BLDC motor operates with constant speed. In general, the BLDC motor is controlled by vector control method. If it could be operated at over critical speed, the control scheme must be modified to flux-weakening control method. The external torque applied on the motor using flux-weakening control method could not be calculated by conventional torque equation because the demagnetizing current Id exists in the motor input current. In this paper, the commonly used flux-weakening control method is studied and the modified torque estimation scheme is suggested. The estimation scheme has been verified by the simulations and experimental results.

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The Study of the method of calculating Maximum voltage in Flux-Weakening Region (약계자 영역에서 최대전압 설정에 관한 연구)

  • 김장목;임익헌;류홍우
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.26-30
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    • 1999
  • The constraint condition is the stator voltage and the stator current to operate the motor in the flux weakening region. The maximum current is limited by the inverter current rating and the machine thermal rating. Given DC link voltage to control the motor in the flux weakening the maximum voltage is determined by considering PWM strategy, dead time, voltage drop of the inverter switching device, and the margin of the voltage for current forcing. In this paper, the new method to determine the available maximum voltage is derived by the analythic method and by considering the factors of the voltage drop. So Determining the maximum voltage is very useful to enlarge the speed operation region in the flux weakening operation, the utility of the maximum voltage is increased.

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Study of the Method of Calculating Maximum Voltage for Flux-Weakening Operation of Interior Permanent Magnet Synchronous Motor (매입형 영구자석 동기전동기의 약계자 제어를 위한 최대전압 선정에 관한 연구)

  • Kim, Jang-Mok;Kim, Su-Yeol;Ryu, Ho-Seon;An, Yong Ho;Yoon, Gi Gab;Lim, Ik-Hun;Jun, Hyang-Sig
    • Journal of the Korean Society of Safety
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    • v.15 no.2
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    • pp.63-69
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    • 2000
  • The constraint conditions are the stator voltage and the stator current to operate the motor in the flux weakening region. The maximum current is limited by the inverter current rating and the machine thermal rating. Given DC link voltage to control the motor in the flux weakening the maximum voltage is determined by considering PWM strategy, dead time, voltage drop of the inverter switching device, and the margin of the voltage for current forcing. In this paper, the new method to determine the available maximum voltage is derived by the quantitative method and by considering the factors of the voltage drop. The proposed method to determine the maximum voltage is very useful to improve the stability of the motor system and to enlarge the speed operation region in the flux weakening operation. Therefore the utility of the maximum voltage is increased.

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NON CONVENTIONAL METHOD FOR SOFT STARTING OF THREE PHASE INDUCTION MOTORS

  • Ahmed Nabil A.;Kim Sung-Jun;Suh Ki-Young;Kown Soon-Kurl;Lee Hyun-Woo
    • Proceedings of the KIPE Conference
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    • 2004.11a
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    • pp.27-31
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    • 2004
  • This paper presents a nonconventional method for oft starting of three-phase induction motors, which achieved by flux weakening technique. flux weakening is not done by reducing the applied voltage as in the conventional methods, Flus weakening is achieved y increasing the supply frequency over the rated value while the voltage amplitude is kept constant. This method has advantage of reducing the stress on the electrical and mechanical systems. The feasibility of this basic idea has been confirmed through investigating the starting transient corresponding to this mode of operation. For this purpose, a rigorous state space mathematical model has been developed and simulated. The validity of the proposed method through the results from the mathematical model have been confirmed experimentally.

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Outer Voltage Regulation Loop for Maximum Torque Operation of Interior Permanent Magnet Synchronous Motor in the Flux (약계자 영역에서 외부 전압제어 루프에 의한 매입형 영구자석 동기전동기의 최대 토오크 운전)

  • Kim, Jang-Mok;Sul, Seung-Ki
    • Proceedings of the KIEE Conference
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    • 1997.07a
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    • pp.121-123
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    • 1997
  • A novel flux-weakening scheme for the Interior Permanent Magnet Synchronous Motor (IPMSM) is proposed. This is implemented based on the output of the synchronous PI current regulator-reference voltage to the PWM inverter. Attractive features of this flux weakening scheme include no dependency on the machine parameters, the guarantee of current regulation at any operating condition, and smooth and fast transition into and out of the flux weakening mode without a discontinuity. Experimental results are presented to verify the feasibility of the proposed control scheme.

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Development of an 80[kW] IPMSM Drive System for an Electric Vehicle (전기자동차용 80[kW] IPMSM 구동 시스템 개발)

  • Kim, Sang-Hoon;Park, Nae-Chun
    • Journal of Industrial Technology
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    • v.33 no.A
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    • pp.61-66
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    • 2013
  • This paper is about the development of 80[kW] IPMSM(Interior Permanent Magnet Synchronous Motor) drive system for an electric vehicle. MTPA(Maximum Torque per Ampere) operation and flux-weakening operation for the optimal torque control of the IPMSM are presented. In this system, the torque control of the IPMSM is achieved by using the look-up table, which gives d- and q-aixs current references for the given torque command in the MTPA operation and flux-weakening operation regions. This look-up table is made by current injection tests, and from which the motor parameters are also estimated. The proposed system is verified by the experiment on the electric vehicle drive system, which consists of an 80[kW] IPMSM and an IGBT inverter.

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