• Title/Summary/Keyword: Field weakening

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Voltage Control Strategy for Maximum Torque Operation of Field Oriented Induction Machine in the Field Weakening Region (전압 궤환 제어를 위한 약계자 영역에서의 벡터 제어 유도전동기의 최대 토오크 운전)

  • 김상훈;설승기
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.43 no.7
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    • pp.1084-1092
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    • 1994
  • An induction machine can be operated in the constant power region over an extended high speed range by means of field weakening. A conventional field weakening method is to set the flux reference inversely proportional to the rotor speed. With this method, however, the machines can't yield the maximum torque over the entire high speed range. In this paper, a new field weakening method for the field oriented induction machine drive by the voltage control strategy is presented. The proposed scheme ensures not only producting the maximum torque over the entire field weakening region but also the robust control independent on machine parameters. Also the smooth transition into the field weakening operation and fast dynamic response during transient operation can be obtained. Simulation and experimental results from a 3hp laboratory induction motor drive system are done to confirm the proposed control algorithm.

Advanced Field Weakening Control for Squirrel-Cage Induction Motor in Wide Range of DC-Link Voltage Conditions

  • Son, Yung-Deug;Jung, Jun-Hyung;Kim, Jang-Mok
    • Journal of Electrical Engineering and Technology
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    • v.12 no.2
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    • pp.665-673
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    • 2017
  • This paper proposes a field weakening control method for operating an induction motor with a variable DC input voltage condition. In the variable DC voltage condition such as a battery, the field weakening method are required for the maximum output power. The conventional field weakening control methods can be used for operating the induction motor over the rated speed in a constant DC-link voltage condition. However, the conventional methods for operating the motor with the variable DC voltage is not suitable for the maximum output power. To overcome this problem, this paper proposes the optimized field weakening control method to extend the operating range of the induction motor with a rated power in a limited thermal and a wide DC input voltage conditions. The optimized d-axis and q-axis current equations are derived according to the field weakening region I and II to extend the operating region. The experimental results are presented to verify the effectiveness of the proposed method.

Transient Torque Maximizing Strantegy of Induction Machine in Field Weakening Region (약계자 영역에서의 유도전동기 과도 토오크 최대화 기법)

  • 송승호;최종우;설승기
    • The Transactions of the Korean Institute of Power Electronics
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    • v.4 no.5
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    • pp.474-482
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    • 1999
  • In this paper, a new field weakening algorithm which maximizes the output torque not only in steady state b but also in transient state is proposed. Considering both voltage and current limit of system, analytic solutions f for optimal torque utilization in field weakening region I and region II are obtained. This algorithm finds optimal currents considering dynamic vol떠ge limit based on flux and speed. So the maximum usage of stator v voltage even in transient state results in the maximum torque and fast response time. Simulation and e experimental results show the effectiveness of the proposed field weakening scheme.

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Maximum Torque Operation of an Induction Machine in the field weakening regoin (약계자 영역에서 유도전동기의 최대 토오크 운전)

  • 김상훈;설승기;박민호
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.43 no.2
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    • pp.225-232
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    • 1994
  • In this paper, a new approach for the induction machine control whih ensures producing maximum torque per ampere over the entire field weakening region is presented. In addition, the relation of the output torque capability with the leakage factor of the machine is examined. Also the smooth and precise transition into the field weakening operation can be achieved by adjusting the base speed for the field weakening operation according to the flux level, the current limit and the voltage limit. The proposed is verified through simulation and experiment for a 5hp laboratory induction motor drive system.

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Voltage Control Strategy for Maximum Torque Operation of Stator-Flux-Oriented Induction Machine Drive in the Field-Weakening Region (약계자 영역에서 유도 전동기의 고정자 자속 기준 최대 토크 운전을 위한 전압 제어 기법)

  • Kim, H.J.;Yu, J.S.;Won, C.Y.;Kim, E.J.;Jo, H.K.;Kim, S.H.
    • Proceedings of the KIPE Conference
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    • 2005.07a
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    • pp.30-32
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    • 2005
  • In this paper, voltage control strategy for maximum torque operation of stator flux-oriented induction machine drive in the field-weakening region is proposed. In a conventional stator flux-oriented (SFO) induction machine drive system of the maximum torque capability cannot be obtained. The field-weakening method is used to vary the stator-flux reference in proportion to the inverse of the rotor speed. The proposed algorithm, based on the voltage control strategy, ensures the maximum torque operation over the field-weakening region. The proposed algorithm, voltage control strategy for maximum torque operation of capability, which is insensitive to the variation of machine parameters In the field-weakening region. The proposed algorithm is verified by simulation.

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A study on Field-Weakening Control for Permanent Magnet Synchronous Motor (영구자석형 동기전동기의 약계자제어에 관한 연구)

  • Lee, Cheol-Gyun;Won, Jong-Soo
    • Proceedings of the KIEE Conference
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    • 1990.11a
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    • pp.5-9
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    • 1990
  • A permanent magnet synchronous motor(PMSM) differs from an ordinary synchronous motor in that the former has no field winding and the field flux can not be controlled by field current. A field-weakening control of PMSM utilizing the demagnetization due to d-axis armature reaction is equivalent to reducing the field current. In this paper, the armature resistance is considered for the optimum field-weakening control.

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Study on The Electromagnetism of Interior Permanent Magnet Synchronous Motor due to Field Weakening (매입형 영구자석 동기전동기의 약계자 제어에 따른 전자기적 특성 연구)

  • Kwon, Soon-O
    • Journal of the Institute of Electronics and Information Engineers
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    • v.50 no.1
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    • pp.254-260
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    • 2013
  • This paper deals with electromagnetic characteristics of IPMSM (Interior Permanent Magnet Synchronous motor) caused by field weakening current control. In order to extend operation speed, field weakening current control is generally used in IPMSM operation. During field weakening, distorted linkage fluxes are resulted by saturation of core material. Therefore, distorted input voltage waveform is required for sinusoidal current input. As the current vector angle increases for field weakening, distortion of linkage flux and back-emf becomes significant. This situation is analyzed by 2-dimensional finite element analysis and verified by experiment. With the results, it is concluded that motor parameters, such as linkage flux by permanent magnet, phase resistance, d-q axis inductance, are insufficient for estimating required voltage for given speed especially in field weakening and additional considerations for increased harmonics of voltage are required.

Maximum Torque Control Of Induction Machines in Field Weakening Region (약계자 영역에서 유도전동기의 최대 토오크 운전)

  • Kim, Sang-Hoon;Sul, Seung-Ki
    • Proceedings of the KIEE Conference
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    • 1994.07a
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    • pp.277-279
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    • 1994
  • In this paper, a novel field weakening scheme for the induction machine by the voltage control strategy is presented. The proposed algorithm ensures producing the maximum torque over the entire field weakening legion. Also by introducing the direct field-oriented control in the field weakening legion with large variation in machine parameters, the drive system can obtain the robustness to machine parameter variation. Moreover, by using estimated speed, sensorless speed control can be possible in very high speed lesion. Experimental results for a laboratory induction motor drive system confirm the validity or the proposed control algorithm.

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Sensorless Vector Control for Maximum Torque of SynRM in the Field Weakening Region (약계자 영역에서 SynRM의 최대 토크제어를 위한 센서리스 벡터제어)

  • Lee, Jung-Chul;Chung, Dong-Hwa
    • Journal of the Korean Society of Safety
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    • v.17 no.2
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    • pp.32-38
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    • 2002
  • In this paper, a new approach for the SynRM(Synchronous Reluctance Motor) control which ensures producing MTPA(Maximum Torque per Ampere) over the entire field weakening region is presented. In addition, this paper presents a speed sensorless control scheme of SynRM using flux observer. Also, by adjusting the base speed for the field weakening operation according to the flux level, the current and voltage limit, the smooth and precise transition into the field weakening operation can be achieved. The validity of the proposed scheme is verified through simulation.

Field-weakening control driving characteristics of Interior Permanent Magnet Synchronous Motor (매입형 영구자석 동기전동기의 약계자 제어시 운전 특성)

  • Bang, Tae-Kyoung;Shin, Kyung-Hun;Lee, Seung-Han;Cho, Han-Wook
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.83-84
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    • 2015
  • In order to use the high-speed range of Interior Permanent Magnet Synchronous Motor(same as IPMSM above), the motor should be at flux weakening control status. High-speed range is called field weakening control region or constant power region, and explain the basic theory of flux weakening control used in the constant power region. Back electromotive force of IPMSM is measured. and field weakening conrtrol driving characteristics is configurated verification test. Through experimentation speed-torque characteristic curve, the efficiency variation corresponding to the current phase angl,the efficiency map were produced.

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