• Title/Summary/Keyword: Commutation

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Design of Sliding Mode Observer for Switched Reluctance Motor

  • Hwang, Young-Seong;Kim, Jin-Young;Choi, Jae-Dong;Kim, Kab-Dong;Seong, Se-Jin
    • Proceedings of the KIPE Conference
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    • 2001.10a
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    • pp.434-437
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    • 2001
  • Generally, a switched reluctance motor (SRM) drive requires a rotor position sensor for commutation and current control. However, this position sensor causes an increase for cost and size of motor drive. In this paper, a sliding mode observer is proposed for indirect position sensing in SRM drive. This estimated rotor position is used for the electric commutation of the machine phases. The paper includes a design approach and operating performance based on the proposed sliding mode observer.

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Dynamic Coordination Strategies between HVDC and STATCOM

  • Kim, Chan-Ki;Sood, Vijay;Lee, Seok-Jin
    • Journal of Power Electronics
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    • v.9 no.6
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    • pp.892-902
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    • 2009
  • This paper deals with the dynamic voltage control problem at the inverter end of a HVDC link when connected to a weak AC system which has the potential for harmonic instability and commutation failures. The dynamic voltage control problem is tackled with a STATCOM (Static Compensator), which not only provides a rapid recovery from harmonic instability and commutation failures but also offers a lower cost filter design for HVDC systems. PSCAD/EMTDC simulations are presented to validate the proposed topology and to demonstrate its robust performance.

교류전동기구동을 위한 광역전류원콘버어터 1

  • 조규형
    • 전기의세계
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    • v.29 no.11
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    • pp.733-741
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    • 1980
  • A novel six-step current source inverter (CSI) with DC-side commutation and energy rebound capability is presented with detailed explanation of the circuit operation. The prposed inverter can operate in a very wide range of frequency and load variation by employing DC-side commutation. Also, the energy rebound makes the use of low voltage SCR's possible and increases the inverter efficiency. Motor operation is also possible in four quadrants in this proposed current source inverter. The advantages of the proposed CSI over conventional ones are described and experimental results are given in oscillograms.

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A New Current Control Method for Torque Ripple Reduction on Brushless DC Motor (Brushless DC Motor에서 토크리플 저감을 위한 새로운 전류제어 기법)

  • Kwon K.J.;Kim S.H.
    • Proceedings of the KIPE Conference
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    • 2003.07b
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    • pp.575-578
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    • 2003
  • This paper presents a new current control method to reduce torque ripple of Brushless DC Motor during commutation. In the proposed control strategy, the current slopes of rising and decaying phase during commutation is equalized by the compensation voltage. By adding the compensation voltage for it to the current controller output, the reduced torque ripple can be obtained. The simulation and experimental results show that the proposed method reduces the torque and the current ripples significantly.

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A Commutation Strategy for Torque Ripple Reduction of Sensorless Drive for BLDC for BLDC Motors (BLDC 전동기용 센서리스 드라이브의 토크 리플 저감을 위한 전유 방법)

  • 여형기;김태형;박정배;이광운;유지윤
    • Proceedings of the KIPE Conference
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    • 1998.07a
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    • pp.337-341
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    • 1998
  • Brushless DC motors have trapezoidal back emf waveform. Generally, because it is drived by a voltage source inverter, the ideal rectangular phase current is not available and therefore produce torque ripple. In this paper, the torque ripple due to commutation is analysed and the practical method that can reduce the torque ripple is proposed. Simulation and experimental results show the effectiveness of the proposed method.

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A Study on the Current Control Method for Torque Ripple Reduction of Brushless DC Motor (브러시리스 직류 전동기의 토크 맥동 저감을 위한 전류 제어 방식에 관한 연구)

  • 이광운;홍희정;박정배;여형기;유지윤
    • Proceedings of the KIPE Conference
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    • 1998.07a
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    • pp.342-346
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    • 1998
  • The brushless DC motor with trapezoidal back emfs has torque ripple due to phase commutation. The torque ripple generates noise and vibration and cause errors in position control so this makes the brushless DC motor less suitable for high performance servo applications. In this paper, we propose a new current control method to reduce the torque ripple due to commutation, when the unipolar PWM method is applied for the phase current control of brushless DC motor.

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유동 전동기 구동을 위한 광역 전류원 콘버어터 2

  • 조규형;박송배
    • 전기의세계
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    • v.30 no.1
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    • pp.41-46
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    • 1981
  • In the current source inverters (CSI), which are widely used recently in many applications, in order to reduce the harmonic contents in the output line current, twelve-step waveform is synthesized usually by a phase-shifted addition of the output currents of two single CSI's. In this paper a new method of synthesis of the 12-step current waveform is suggested which employes a main and a new auxiliary inverters having lower capacity, and thus is economically advantageous over the conventional scheme. DC-side commutation and energy rebond circuit as described in Part I are also employed in this proposed twelve-step CIS for effective commutation and high reliability. Experimental results are also given in oscillgrams.

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An Improved Torque Ripple Minimization of Brushless DC Motor (개선된 Brushless DC Motor의 토크리플 최소화)

  • Chung, Jin-Hwa;Chung, Sun-Tae
    • Proceedings of the KIEE Conference
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    • 1994.07a
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    • pp.298-302
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    • 1994
  • Brushless DC motors have a trapezoidal back EMF wave form and are fed with rectangular stator currents. Under these conditions, the torque produced is theoretcally constant. However, in practice, torque ripple may exist, one major cause of which conies from phase current commutation. In this paper we propose an improved method of reducing the torque ripple due to phase current commutation of indirectly restricting the uncommutated current through control of the other phase currents. Simulation results are present.

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Solving the commutation problem of single-phase PWM AC-AC converter using basic switching cell (스위칭 셀을 이용하여 커뮤테이션 문제를 해결한 단상 PWM AC-AC 컨버터)

  • Shin, Hyunhak;Cha, Honnyong;Kim, Heung-Geun
    • Proceedings of the KIPE Conference
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    • 2013.07a
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    • pp.194-195
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    • 2013
  • This paper presents novel single-phase PWM AC-AC converters that can solve commutation problem in single-phase direct AC-AC converter without sensing input voltage polarity. By using the basic switching cell concept and coupled inductor, the proposed converter can be short and open-circuit without damping switching devices. A 120 W prototype is built and tested to verify performance of the proposed converter.

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A Study on the Phase Shift With the Thyrtisors Utilized (Thyristor를 이용한 Phase shift에 관한 연구)

  • 박민호;김민수
    • 전기의세계
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    • v.27 no.6
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    • pp.63-68
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    • 1978
  • To convert into multiphase from single phase are often necessary for industry field. In oder to convert of phase, phase shifted voltages are first buileded by single phase and then must combine with these voltages adequately. This paper aims at the description of the way of phase shift by means of turning on or turning off through natural commutation and forced commutation methods with firing angle of thyristor pating a role of switching controlled adequately. Experimental result of the Phase Shift with the Thyristors Utilized has been turned out to shift the phase to 60.deg., 90.deg., 120.deg., and other angles.

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