Development of SR Motor Driving Method Based on New Control Theory for Rare Earth Free Electric Vehicles

• Project/Area Number: 15K18021
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: Okayama University
• Principal Investigator: Umetani Kazuhiro 岡山大学, 自然科学研究科, 助教 (60749323)
• Project Period (FY): 2015-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 電気自動車 / ハイブリッド自動車 / 同期モータ / インバータ / トルクリップル / スイッチトリラクタンスモータ / モータ理論 / トルクリプル / 電源電流リプル / 解析力学 / 駆動方法 / スイッチドリラクタンスモータ / 解析モデル

Outline of Final Research Achievements

Switched reluctance motors (SR motor) are excellent in durability and low cost because permanent magnets are not required. On the other hand, there are problems such as large torque ripple which causes noise, large power supply current ripple generated in the power supply current of the inverter which drives the motor, and difficulty in high-speed drive. To solve this problems simultaneously, this paper proposed a driving method of the SR motor using a new phase current waveform. In addition, this paper elucidated the optimum structure of SR motor suitable for this driving method in order to minimize the increase of phase current, which is a drawback of this driving method.

Academic Significance and Societal Importance of the Research Achievements

近年、環境負荷が少ない電動自動車としてEVやHVが急速に普及し始めている.このような自動車の駆動には，小型・高出力なモータが必要であり，その観点から現在，埋め込み磁石同期モータを広く用いている．ところが，このモータはレアアースを主成分とするネオジウム磁石を多用するために，レアアースの供給不安定の影響を受けやすく，価格が高くなりやすい．本研究では，埋め込み磁石同期モータを，レアアースを用いないスイッチトリラクタンスモータに置き換えることために必要な新しい駆動方法を，世界に先駆けて開発することができた．本成果を活用することで，EVやHVの安定的な普及が可能になると期待している．

Research Products

• [Presentation] Core Loss Modeling Based on Equivalent Circuit for Switched Reluctance Motors (2019)
  • Author(s): 楠見隆行, 小林皓祐, 原拓斗, 梅谷 和弘, 平木 英治
  • Organizer: IEEE International Conference on Industrial Technology
  • Int'l Joint Research
• [Presentation] Rotor configuration which reduces copper loss of switched reluctance motors with suppression of torque ripple and input current ripple (2018)
  • Author(s): 楠見隆行, 原拓斗, 梅谷 和弘, 平木 英治
  • Organizer: IEEE Energy Conversion Congress and Expositions
  • Int'l Joint Research
• [Presentation] Theoretical derivation of phase current profile for switched reluctance motors to suppress radial force ripple and torque ripple (2018)
  • Author(s): 楠見隆行, 原拓斗, 梅谷 和弘, 平木 英治
  • Organizer: IEEE International Symposium of Industrial Electronics
  • Int'l Joint Research
• [Presentation] 電気自動車用スイッチトリラクタンスモータにおけるトルクリップルと電源電流リップルを抑制するための相電流プロファイルと磁気抵抗プロファイルの導出 (2017)
  • Author(s): 楠見隆行, 原拓斗, 梅谷 和弘, 平木 英治
  • Organizer: 電気学会回転機研究会
• [Presentation] Simple Analytical Derivation of Magnetic Flux Profile Eliminating Source Current Ripple and Torque Ripple of Switched Reluctance Motors for Electric Vehicle Propulsion (2017)
  • Author(s): 楠見隆行，原拓斗，梅谷和弘，平木英治
  • Organizer: IEEE Applied Power Electronics Conference and Exposition 2017
  • Place of Presentation: 米国・タンパ
  • Int'l Joint Research
• [Presentation] A Simple Behavior Model for Switched Reluctance Motors Based on Magnetic Energy (2016)
  • Author(s): 原 拓斗, 楠見 隆行, 梅谷 和弘, 平木 英治
  • Organizer: IEEE International Power Electronics and Motion Control Conference (IPEMC2016)
  • Place of Presentation: 中華人民共和国, 合肥市
  • Year and Date: 2016-05-21
  • Int'l Joint Research
• [Presentation] Simple Control Technique to Eliminate Source Current Ripple and Torque Ripple of Switched Reluctance Motors for Electric Vehicle Propulsion (2016)
  • Author(s): 楠見隆行，原拓斗，梅谷和弘，平木英治
  • Organizer: IEEE Industrial Electronics Conference 2016
  • Place of Presentation: イタリア・フィレンツェ
  • Int'l Joint Research