Magnetic flux filtering rotors in fractional-slot concentrated winding induction motors

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04006
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• 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): 2021-04-01 – 2024-03-31
• Keywords: 誘導モータ / 分数スロット集中巻 / 磁気フィルタ回転子 / 波型回転子

Outline of Final Research Achievements

This research proposed a rotor winding configuration to filter space harmonics in rotating magnetic field (RMF) owing to stator fractional-slot concentrated winding (FSCW) configurations for induction motors. Stator FSCW configurations generate a specific harmonic that produces the drive-torque and several other harmonics as the dominant components in the stator RMF. Conventional squirrel-cage winding rotors generate torques derived from all the dominant stator RMF harmonics. This prevents the production of adequate drive-torque and line-start capability. The proposed wave-winding rotor traps the driving RMF harmonic and completely eliminates the effects of the other dominant RMF harmonics. This filtering effect on the stator RMF harmonics leads to the production of an adequate drive-torque and line-start capability. The efficacy of the proposed rotor winding configuration is determined theoretically, numerically, and experimentally.

Free Research Field

電力工学・電力変換・電気機器

Academic Significance and Societal Importance of the Research Achievements

本研究で提案する設計法の確立は，多くの分数スロット集中巻誘導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直す研究開発の流れに寄与する．