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Development of an Axial Gap Motor for Traction Applications Achieving Both High Performance and Low Cost

Research Project

Project/Area Number 22K20429
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0302:Electrical and electronic engineering and related fields
Research InstitutionOkayama University

Principal Investigator

Tsunata Ren  岡山大学, 環境生命自然科学学域, 研究准教授 (40965646)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords省エネルギー / 自動車駆動用モータ / 電気自動車(EV) / アキシャルギャップモータ / 低コスト / 高効率 / フェライト磁石 / 高効率化 / 実機検証 / 低消費電力 / 低コスト化 / 高性能化と低コスト化の両立 / 丸線
Outline of Research at the Start

本研究では,自動車駆動用のアキシャルギャップモータにおいて,低価格なフェライト磁石と丸銅線を用いながらも,市販のモータと同等以上の性能を実現し,『高性能化と低コスト化を両立した自動車駆動用モータ』を実現する。申請者はこれまでに,磁場解析で上記の実現可能性を検証し,解析においては市販モータに対し,同等以上の性能を達成できる新構造を提案している。本課題における目的は,提案モータを試作し,実機検証で有用性を明らかにすると同時に,その結果に基づいた改良設計を実施し,実用化に向けた更なる性能向上を実現することである。

Outline of Final Research Achievements

In recent years, the production volume of permanent magnet synchronous motors, which serve as the drive source for electric vehicles, is expected to increase significantly. Therefore, there is a need not only for higher performance motors, but also for lower costs. However, in order to achieve high performance, many current motors use expensive neodymium sintered permanent magnets and rectangular copper wire. Therefore, in this research, I proposed a new rotor structure and optimized the stator tip shape for an axial gap motor, thereby achieving performance equivalent to or better than conventional motors while using low-cost ferrite permanent magnets and round copper wire. We have succeeded in developing a "traction motor that achieves both high performance and low cost.'' Finally, I developed a prototype of the proposed axial gap motor and demonstrated its effectiveness through experiments.

Academic Significance and Societal Importance of the Research Achievements

近年,世界中で自動車の電動化の動きが活発になっており,自動車の駆動源がエンジンからモータに変わりつつある。経済産業省によると,我が国でも2030年にはモータを駆動源としたEV等の販売台数を全体の約50~70%にするための政策が進められている。以上より,自動車駆動用モータの生産台数が飛躍的に増加することが予想されており,今後の駆動用モータは高性能でありながら,「低コスト」で生産できることが重要である。本研究の提案モータは「フェライト磁石」と「丸銅線」という低価格な材料で一般的な駆動用モータと同等以上の性能を実現できるため,将来的に自動車駆動用モータの有力な選択肢となる可能性を持っている。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (10 results)

All 2024 2023 2022

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (7 results) (of which Int'l Joint Research: 5 results)

  • [Journal Article] Designing and Prototyping an Axial-Flux Machine Using Ferrite PM and Round Wire for Traction Applications: Comparison with a Radial-Flux Machine Using Nd-Fe-B PM and Rectangular Wire2024

    • Author(s)
      Tsunata Ren、Izumiya Kosuke、Takemoto Masatsugu、Imai Jun、Saito Tatsuya、Ueno Tomoyuki
    • Journal Title

      IEEE Transactions on Industry Applications

      Volume: - Issue: 3 Pages: 1-15

    • DOI

      10.1109/tia.2024.3371959

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A Proposal of an Axial-Flux Permanent-Magnet Machine Employing SMC Core With Tooth-Tips Constructed by One-Pressing Process: Improving Torque and Manufacturability2023

    • Author(s)
      Tsunata Ren、Takemoto Masatsugu、Imai Jun、Saito Tatsuya、Ueno Tomoyuki
    • Journal Title

      IEEE Access

      Volume: 11 Pages: 109435-109447

    • DOI

      10.1109/access.2023.3321829

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Comparison of Thermal Characteristics in Various Aspect Ratios for Radial-Flux and Axial-Flux Permanent Magnet Machines2023

    • Author(s)
      Tsunata Ren、Takemoto Masatsugu、Imai Jun、Saito Tatsuya、Ueno Tomoyuki
    • Journal Title

      IEEE Transactions on Industry Applications

      Volume: 59 Issue: 3 Pages: 3353-3367

    • DOI

      10.1109/tia.2023.3255845

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed
  • [Presentation] The Superiority of Efficiency Considering Harmonic Current caused by PWM inverter in Axial-Flux PM Machine Using Ferrite PM for Traction applications: Compasiron to Radial-Flux PM Machines Using NdFeB PM2023

    • Author(s)
      Tsunata Ren、Takemoto Masatsugu、Imai Jun、Saito Tatsuya、Ueno Tomoyuki
    • Organizer
      IEEE ENERGY CONVERSION CONGRESS and EXPO. (ECCE2023)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Teaching Method for Electrical Machines Focusing on Differences Between Simulation and Experimental Verification2023

    • Author(s)
      Tsunata Ren、Takemoto Masatsugu
    • Organizer
      2023 IEEE 10th International Conference on E-Learning in Industrial Electronics (ICELIE)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] PWM駆動時における自動車駆動用アキシャルギャップモータのラジアルギャップモータに対する効率優位性の検証2023

    • Author(s)
      綱田錬,竹本真紹,今井純,齋藤達哉,上野友之
    • Organizer
      令和5年電気学会産業応用部門大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] The Superiority of Efficiency Considering Harmonic Current caused by PWM inverter in Axial-Flux PM Machine Using Ferrite PM for Traction applications: Compasiron to Radial-Flux PM Machines Using NdFeB PM2023

    • Author(s)
      R. Tsunata, M. Takemoto, J. Imai, T. Saito and T. Ueno
    • Organizer
      IEEE ENERGY CONVERSION CONGRESS and EXPO. (ECCE2023)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Axial-Flux Machine Using Ferrite PM and Round Wire Competitive to Radial-Flux Machine Using Nd-Fe-B PM for HEV Traction2022

    • Author(s)
      K. Izumiya, R. Tsunata, M. Takemoto, J. Imai, T. Saito and T. Ueno
    • Organizer
      IEEE International Conference of Electrical Machines (ICEM2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] フェライト磁石と丸線を採用した自動車駆動用アキシャルギャップモータにおける高出力密度化及び高効率化のための検討2022

    • Author(s)
      和泉谷洸輔,綱田錬,竹本真紹,今井純,齋藤達哉,上野友之
    • Organizer
      令和4年電気学会産業応用部門大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Comparison of Thermal Characteristic in Various Aspect Ratios of Radial-Flux and Axial-Flux Permanent Magnet Machines2022

    • Author(s)
      R. Tsunata, M. Takemoto, J. Imai, T. Saito and T. Ueno
    • Organizer
      IEEE ENERGY CONVERSION CONGRESS and EXPO. (ECCE2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

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Published: 2022-09-01   Modified: 2025-01-30  

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