A design method to improve space harmonic distribution of fractional-slot concentrated winding motors with magnetic saturation

• Project/Area Number: 18K13745
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 21010:Power engineering-related
• Research Institution: Nagasaki University
• Principal Investigator: YOKOI Yuichi 長崎大学, 工学研究科, 准教授 (80610469)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2019: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
• Keywords: モータ / 分数スロット集中巻 / 磁気飽和 / 可変磁束 / 集中巻 / 分数スロット巻線 / 空間高調波 / 逆起電力 / 集中巻き

Outline of Final Research Achievements

This research establishes and verify the design method to improve the performance of fractional-slot concentrated winding motors with magnetic saturation in iron cores. The magnetic saturation is suppressed in conventional motor designs because the phenomenon gives rise to undesirable effects on the motor performances. This research clarifies that the performance of fractional-slot concentrated winding motors can be improved by the variation of d- and q-axis inductances with magnetic saturation theoretically and numerically through a finite-element method analysis and determines the efficacy through experiments with a prototype.

Academic Significance and Societal Importance of the Research Achievements

本研究の提案設計は，多くの分数スロット集中巻モータの設計に容易に応用できるため，学術的のみならず産業界への波及効果は大きいと考えられる．また，この提案設計が従来設計にとらわれない新たな設計によって特性向上を目指すという考えに基づいていることを踏まえ，既存の設計理論の適用が適切かどうかわからない分数スロット集中巻モータなどに対する設計を抜本的に見なす研究開発の流れに寄与する．

Research Products

• [Journal Article] Design of slit width to improve space harmonic distribution in a slit stator motor (2019)
  • Author(s): Yokoi Yuichi、Hashizume Ryuta、Higuchi Tsuyoshi
  • Journal Title: IET Electric Power Applications Volume: 13 Issue: 8 Pages: 1125-1130
  • DOI: 10.1049/iet-epa.2018.5289
  • NAID: 120006988432
  • Peer Reviewed
• [Presentation] A Study on Air-Gap Flux Density Distribution of Bridged Slit-Stator Motors (2020)
  • Author(s): Y. Ikeda, Y. Yokoi, T. Higuchi
  • Organizer: The 23rd International Conference on Electrical Machines and Systems
  • Int'l Joint Research
• [Presentation] 磁気飽和を活用した集中巻構成可変磁束モータの実験的検討 (2019)
  • Author(s): 山田 大門，荒木 遼太，横井 裕一，樋口 剛
  • Organizer: 電気学会産業応用部門大会
• [Presentation] 鉄心材料の特性を考慮した集中巻モータの設計 (2019)
  • Author(s): 横井 裕一、樋口 剛
  • Organizer: 電気学会全国大会
• [Presentation] 磁気飽和を活用した集中巻構成可変速モータの一検討 (2018)
  • Author(s): 山田 大門、横井 裕一、樋口 剛
  • Organizer: 電気学会回転機研究会