• Title/Summary/Keyword: switched reluctance motor (SRM)

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Vibration and Acoustic Noise Reduction Method of SRM Using Auxiliary Winding (보조권선 활용에 의한 SRM의 진동 및 소음 저감 방안)

  • 정태욱
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.52 no.11
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    • pp.548-556
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    • 2003
  • Switched reluctance motor(SRM) has simple magnetic structure, and needs simple power electronic driving circuit. It is very useful for wide range adjustable speed drive system. But, SRM drive generates large vibration and acoustic noise because it is commutated individually by step pulse m.m.f of each phase. In the vibration and acoustic noise characteristics. the considerable vibration and noise is induced by radial deforming of stator, so the frequency of dominant vibration and noise is coincident with the frequency of natural frequency of mechanical structure. This radial vibration force is generated by abrupt change of radial magnetic force in the phase commutation region. This paper studied about simple electromagnetic structure of SRM using auxiliary compensating winding for the reduction of noise and vibration. This auxiliary winding is coupled with all phase windings electromagnetically and absorb and transfer magnetic energy variation from phase to other phase. By this interaction of phase windings and compensating winding can reduce abrupt radial force change and vibration and acoustic noise. In this paper the improvement effect is examined by the test of prototype machine.

A Design Method of Bearingless SRM For Suspension Power and Starting Torque (부상력 및 기동 토오크틀 고려한 Bearingless SRM의 기본 설계)

  • Lee, Chan-Gyo;Oh, Ju-Hwan;Kwon, Byung-Il
    • Proceedings of the KIEE Conference
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    • 2006.07b
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    • pp.865-866
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    • 2006
  • Bearingless Switched Reluctance Motor(SRM) have combined characteristics of SRM and magnetic bearing. Production of radial force for rotor shaft magnetic suspension is explained with differential stator windings. Bearingless SRM is simple structurally because the permanent magnet does not exist and bearing does not take the influence at the environment because it does not exist and has strong torque, and loss of bearing by bearing current has the advantage not to exist. In this paper, a design method of bearingless SRM for suspension power and starting torque is proposed. The design model is implement by maxwell.

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Computation of theoretical design parameter of sin91e Phase SRM for a blower drives (송풍기 구동용 단상 SRM의 이론적 설계파라미터 산정)

  • Lee, Jong-Han;Lee, Chung-Won;Lee, Eun-Woong;Oh, Young-Woong
    • Proceedings of the KIEE Conference
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    • 2003.04a
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    • pp.88-90
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    • 2003
  • SRM has a characteristic of a robust, simple structure and wide operating ranges. So, recently it has studied and developed in many kinds and forms with the technology of power electronics and analysis and design by use of computer. Also, It is used in a very wide range of industrial applications. In particular, single phase switched reluctance motor has a merit in practical use because it has simple operating drives and control systems, very high energy density per unit volume comparing with three phase SRM. But it must have a starting device. In this paper design procedures of single phase SRM development for blower drives are presented. It is selected the design parameters by compared with design theory of general electric machine and poly phase SRM. Also it is simulated the designed prototype model by FEM for the prediction of characteristics.

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Multi-level Inverter for the Excitation Control of an SRM (SRM의 여자제어를 위한 멀티레벨 인버터)

  • 이상훈;박성준;안진우
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.52 no.4
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    • pp.161-169
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    • 2003
  • The applications of SRM(Switched Reluctance motor) are dramatically increasing due to a simple mechanical structure, a high efficiency and a high speed drive characteristics. Energy recovery in the regenerative region is very important when SRM is used in traction drive. This is to reduce energy loss during mechanical braking and/or to have a high efficiency drive. To control excitation voltage during motoring and regenerating voltage in the generator operation in the SRM, multi-level voltage control is effective. This paper suggests multi-level inverter which is useful for motoring and regenerative operation. The proposed method is verified through simulations and experiments.

A New Current Sharing Strategy of SRM Using Parallel Winding Method (병렬권선 방식에 의한 SRM의 부하전류분담)

  • 박성준;이동희;안진우;안영주
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.52 no.4
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    • pp.154-160
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    • 2003
  • The switched reluctance motor(SRM) has a considerable potential for industrial applications because of its high reliability as a result of the absence of rotor windings. In some applications with SRM, a parallel switching strategy is often used for cost saving, increasing of current capacity and system reliability. This paper proposes a new parallel switching strategy of SRM using parallel winding. While conventional parallel switching devices are connected in a phase winding, power devices are connected in the parallel windings wound in each pole of stator in the proposed method. Paralleling strategy for current sharing in the proposed method can be easily determined without considerations of any nonlinear characteristics of power devices such as conduction resistance, threshold voltage and gain factor. The proposed paralleling strategy is verified by the mathematical analysis and experimental results.

Multi-level Inverter for the Excitation Control of an SRM (SRM의 여자제어를 위한 멀티레벨 인버터)

  • 이상훈;박성준;안진우
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.4
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    • pp.161-161
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    • 2003
  • The applications of SRM(Switched Reluctance motor) are dramatically increasing due to a simple mechanical structure, a high efficiency and a high speed drive characteristics. Energy recovery in the regenerative region is very important when SRM is used in traction drive. This is to reduce energy loss during mechanical braking and/or to have a high efficiency drive. To control excitation voltage during motoring and regenerating voltage in the generator operation in the SRM, multi-level voltage control is effective. This paper suggests multi-level inverter which is useful for motoring and regenerative operation. The proposed method is verified through simulations and experiments.

New Switching Pattern for the Paralleling of SRM Low Voltage Inverter (저전압형 SRM 인버터의 병렬운전 위한 새로운 스위칭)

  • 이상훈;박성준;원태현;안진우;이만형
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.6
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    • pp.359-367
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    • 2004
  • The switched reluctance motor(SRM) has considerable potential for industrial applications because of its high result lily as a result of the absence of rotor windings. In some applications with SRM, paralleling strategy is often used for cost saving, increasing of current capacity and system reliability. A SRM inverter has very low ,switching frequency. This results in reducing the burden for a high-speed of the gate-amp interface circuit. and the linearity of optocoupler is used to protect the instantaneous peak current for the stable operation. In this paper, series resistor is used to equal the current sharing of each switching device and a linear gate-amp is proposed to protect the instantaneous peak current which occurs in transient state. The proposed paralleling strategy is verified by experimental results.

Characteristics Analysis of Double Stator Axial Field 12/10 SRM (이중 고정자 횡축 12/10 SRM의 특성 해석)

  • Son, Dong-Ho;Lee, Dong-Hee;Ahn, Jin-Woo
    • Proceedings of the KIPE Conference
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    • 2017.07a
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    • pp.146-147
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    • 2017
  • 본 논문은 새로운 구조의 이중 고정자 횡축 12/10 Switched Reluctance Motor(SRM)을 설계에 관한연구이다. 자동차 냉각팬에 적용하기 위해 Conventional 12/8과 Single Stator AF(Axial Field) SRM이 검토되었다. Axial Field의 장점은 기존의 방사형 보다 짧은 자속 경로를 가져 높은 토크와 효율을 가지지만 Single Stator AF SRM은 하나의 고정자와 회전자로 이루어져 있어 편심등 기구적으로 불안정하다는 단점이 있다. 이중 고정자 횡축 12/10 SRM은 두 고정자 사이에 회전자가 위치에 있어 Single Stator AF의 단점을 보안 할 수 있으며, 전기적인 특성 및 영향을 검토하기 위해 유한요소해석(FEA)을 수행하였다.

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Development of Low Noise SRM Drive for EV Application (소음저감을 위한 EV용 SRM 및 제어기의 개발)

  • Song, Hyun-Soo;Park, Sung-Jun;Ahn, Jin-Woo
    • Proceedings of the KIEE Conference
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    • 2003.07b
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    • pp.753-755
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    • 2003
  • The switched reluctance motor(SRM) drive system provides a good adjustable speed and torque characteristics. SRM has the possibility of maintaining full power over a wide speed range. So, many attempts are being done from home appliances to industrial machinery and tools. Especially, a traction drive of an SRM is one of a good application for it's DC-series characteristic. However, because of the switching mechanism, it has some disadvantage of noise and vibration. It is difficult to adopt to an appliance demanding silency. A noise simulation of 6/4 and 12/8 SRM was done in order to compare each other, and the design was done carefully.

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Performance Estimation Method for a Switched Reluctance Motor without the Design Process of the Torque Controller (토크 제어기 설계가 필요 없는 SRM의 성능 평가 방법)

  • Choi, Chang-Hwan;Lee, Dae-Ok;Park, Kyi-Hwan
    • Proceedings of the KIEE Conference
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    • 2000.11b
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    • pp.235-237
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    • 2000
  • 본 연구에서는 SRM의 설계 단계에서 일반적으로 얻을 수 있는 자속 쇄교-전류 곡선으로부터 SRM의 토크-속도 특성 곡선을 예측하는 방법을 제시한다. B-스플라인 함수를 이용하여 SRM에 가해질 수 있는 상전류 파형을 모두 모델링하고 각각의 회전자의 속도에서 최대의 토크를 낼 수 있는 전류 파형을 구한다. 제안된 방법은 상전류 제어뿐만 아니라 스위칭 각도 제어까지 고려한 모든 상전류 파형을 표현할 수 있기 때문에 SRM이 최적으로 동작하는 상황에서의 토크-속도 특성임을 보장할 수 있다. 제안된 방법은 SRM의 설계 단계에서 별도의 제어기 설계 없이 간단히 성능을 평가할 수 있는 방법이다.

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