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Research on Reduction of EMI Produced by a Valiable-Speed Motor Drive System with a PWM invester

Research Project

Project/Area Number 08650336
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 電力工学・電気機器工学
Research InstitutionOkayama University

Principal Investigator

OGASAWARA Satoshi  Okayama University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (40160733)

Co-Investigator(Kenkyū-buntansha) FUJITA Hideaki  Okayama University, Faculty of Engineering, Research Associate, 工学部, 助手 (40238580)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1997: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1996: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsEMI / EMC / leakage current / PWM inverter / common-mode transformer / CMT / normal-mode filter (NMF) / active common-noise canceler / ACC
Research Abstract

This research aimes to clarify mechanism of generating both radiative and conductive noises and to develop reduction methods of the noises, in variabile-speed AC motor drive system using a voltage-source PWM inverter.
First of all, for a three-phase AC motor, we have proposed a high-frequency equivalent consisting of only three capacitors each of which connects between a motor terminal and a motor frame. Experiment using an induction motor drive system (3.7 kW) and simulation using a circuit simulator have demonstrated that the proposed high-frequency equivalent circuit can simulate both common- and normal-mode currents caused by switching operation of the PWM inverter with enough accuracy. Moreove, based on the proposed equivalent circuit, we have developed "common-mode transformer (CMT), " which acts as a resistance only to the common-mode current, and "normal mode filter (NMF), " which can dump the high-frequency oscillating current flowing between two phase of the motor, and design … More methods for these components have been studied in detail. In addition, it has been shown theoretically and experimentally that the CMT and NMF can reduce not only EMI but also serge voltage appearing on a motor terminal at a switching instant of the inveter.
On the other hand, we have proposed an "active common noise canceler (ACC)" which can cancel the common-mode voltage using an active element, in contrast to the conventional components. The operation and effect have been confirmed by some experiments, and the design method has been studied in detail. The patent applications for the ACC have been made to Japan and United States through the Japan Society for the Promotion of Science. The patent applications for the ACC have been made to Japan and United States through the Japan Society for the Promotion of Science.
Finaly, we believe that the results obtained by this research contribute to advancement of theoretical and systematic research of EMI/EMC occurring in power electronics apparatus. Less

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 小笠原 悟司 他1名: "Modeling and Damping of High-Frequency Leakage Currents in PWM Inverter-Fed AC Motor Drive Systems" IEEE Transactions on Industry Applications. Vol.32 No.5. 1105-1114 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小笠原 悟司 他2名: "PWMインバータを用いた交流電動機駆動システムが発生するEMIの測定とその低減法" 電気学会論文誌D. 116巻,12号. 1211-1219 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小笠原 悟司 他2名: "電圧形PWMインバータが発生するコモンモード電圧のアクティブキャンセレーション" 電気学会論文誌D. 117巻,5号. 565-571 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ogasawara and H.Akagi: "Modeling and Damping of High-Frequency Leakage Currents in PWM Inverter-Fed AC Motor Drive Systems" IEEE Trans.on IA. Vol.32, No.5. 1105-1114 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Satoshi Ogasawara, Hideki Ayano and Hirofumi Akagi: "Measurement and Reduction of EMI Radiated by a PWM Inverter-Fed AC Motor Drive System" Trans.IEE of Japan. Vol.116-D,No.12. 1211-1219 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Satoshi Ogaswara, Hideki Ayano and Hirofumi Akagi: "Active Cancellation of the Common-Mode Voltage Produced by a Voltage-Source PWM Inverter" Trans.IEE of Japan. Vol.117-D,No.5. 565-571 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary

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Published: 1996-04-01   Modified: 2016-04-21  

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