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Derivation of torque equation for magnetic-geared motors considering magnetic interaction and application to small-scale electric vehicles

Research Project

Project/Area Number 21H01302
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 21010:Power engineering-related
Research InstitutionTohoku University

Principal Investigator

Nakamura Kenji  東北大学, 工学研究科, 教授 (70323061)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
Fiscal Year 2023: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
Fiscal Year 2022: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2021: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Keywords磁気ギヤードモータ / 磁気的相互作用 / 電気自動車 / インホイールドライブ方式 / インホールドライブ方式
Outline of Research at the Start

本研究では、磁気ギヤードモータを用いたインホイールドライブ方式の小型電気自動車の実現を目指し、以下の3つの項目について検討を行う。
①磁気的相互作用を考慮した磁気ギヤードモータのトルクの理論式の導出と妥当性の検証
②上記トルクの理論式に基づく新しい制御法の提案
③定格容量が数kW程度の磁気ギヤードモータの設計・試作と、小型電気自動車への実装および走行試験の実施

Outline of Final Research Achievements

The magnetic-geared motors, which integrate a permanent magnet (PM) motor with a magnetic gear, are suitable for small and flat structures and can achieve high torque at low speeds. Thus, it is expected to be applied to in-wheel drive electric vehicles. In this study, a torque equation that takes into account the magnetic interaction between the PM motor and the magnetic gear is derived to clarify the drive method that can improve torque and efficiency. Moreover, analytical design and prototype tests of a large-scale 500 N-m class magnetic-geared motor for application to small-scale electric vehicles are conducted. Torque density of 83 N-m/L was achieved by the prototype magnetic-geared motor.

Academic Significance and Societal Importance of the Research Achievements

磁気的相互作用を考慮した磁気ギヤードモータのトルク式導出し、トルクや効率を向上可能な駆動方法を明らかにしたことは、今後の磁気ギヤードモータの分野のさらなる発展につながるため、学術的意義は高いと判断できる。また、小型電気自動車への応用を想定した500N・m級の大型の磁気ギヤードモータの実証実験が成功したことは、今後の産業応用につながる成果であるため、社会的意義も極めて高いと考える。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (15 results)

All 2023 2022 2021

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 3 results) Presentation (10 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Proposal of In-Wheel Type Magnetic-Geared SR Motor for Compact EV2023

    • Author(s)
      伊藤亘輝、中村健二
    • Journal Title

      Transaction of the Magnetics Society of Japan Special Issues

      Volume: 7 Issue: 1 Pages: 55-60

    • DOI

      10.20819/msjtmsj.23TR506

    • ISSN
      2432-0471
    • Year and Date
      2023-05-01
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A Novel Magnetic-Geared Motor Combining Magnetic Gear and SR Motor2023

    • Author(s)
      Iwaki Keigo、Ito Koki、Nakamura Kenji
    • Journal Title

      IEEE Transactions on Magnetics

      Volume: 59 Issue: 11 Pages: 1-5

    • DOI

      10.1109/tmag.2023.3276873

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Experimental Verification of Torque Density Improvement by Magnetic Interaction in 500 N・m IPM-Type Magnetic-Geared Motor2023

    • Author(s)
      Iwaki Keigo、Ito Koki、Nakamura Kenji
    • Journal Title

      IEEE Transactions on Magnetics

      Volume: 59 Issue: 11 Pages: 1-5

    • DOI

      10.1109/tmag.2023.3291372

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A Consideration of Efficiency and Power Factor of IPM-type Magnetic-Geared Motor2022

    • Author(s)
      Ito K.、Nakamura K.
    • Journal Title

      Journal of the Magnetics Society of Japan

      Volume: 46 Issue: 1 Pages: 16-21

    • DOI

      10.3379/msjmag.2201R004

    • NAID

      130008139198

    • ISSN
      1882-2924, 1882-2932
    • Year and Date
      2022-01-01
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Proposal and Verification of Torque Equation of IPM-Type Magnetic-Geared Motor2021

    • Author(s)
      Ito Koki、Nakamura Kenji
    • Journal Title

      IEEJ Journal of Industry Applications

      Volume: 10 Issue: 6 Pages: 612-617

    • DOI

      10.1541/ieejjia.20012813

    • NAID

      130008110485

    • ISSN
      2187-1094, 2187-1108
    • Year and Date
      2021-11-01
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Experimental Verification of Increasing Torque Density by Magnetic Interaction in 500 N・m Class IPM-Type Magnetic-Geared Motor2023

    • Author(s)
      K. Iwaki, K. Ito, K. Nakamura
    • Organizer
      INTERMAG 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Novel Magnetic-Geared Motor Combining Magnetic Gear and SR Motor2023

    • Author(s)
      K. Iwaki, K. Ito, K. Nakamura
    • Organizer
      INTERMAG 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 小型EV用インホイール磁気ギヤードSRモータの設計2023

    • Author(s)
      岩城圭悟,中村健二
    • Organizer
      スピニクス特別研究会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 非接触磁気ギヤ・磁気ギヤード機の高性能化2023

    • Author(s)
      中村健二
    • Organizer
      日本磁気学会 第246回研究会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 小型EV用インホイール磁気ギヤードSRモータの提案2022

    • Author(s)
      伊藤亘輝,中村健二
    • Organizer
      日本磁気学会学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 500 N・m級磁気ギヤードモータの試作試験2022

    • Author(s)
      伊藤亘輝,中村健二,伊藤 誠,高畑良一,高橋暁史
    • Organizer
      電気学会回転機研究会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 磁気ギヤとSRモータを融合一体化した磁気ギヤードモータ2022

    • Author(s)
      伊藤亘輝,中村健二
    • Organizer
      電気学会MAG/MD/LD合同研究会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Influence of Magnetic Interaction on Power Factor and Efficiency of IPM-Type Magnetic-Geared Motor2021

    • Author(s)
      K. Ito, K. Nakamura
    • Organizer
      INTERMAG 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 埋込磁石型磁気ギヤードモータの力率・効率に関する一考察2021

    • Author(s)
      伊藤亘輝,中村健二
    • Organizer
      日本磁気学会学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 磁気的相互作用が埋込磁石型磁気ギヤードモータの特性に与える影響2021

    • Author(s)
      伊藤亘輝,中村健二
    • Organizer
      電気学会回転機研究会
    • Related Report
      2021 Annual Research Report

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Published: 2021-04-28   Modified: 2025-01-30  

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