Development of a Variable-Flux Permanent Magnet Motor for EVs Using Flux Modulation Principle

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04359
• 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: Kanazawa Institute of Technology
• Principal Investigator: Tadashi Fukami 金沢工業大学, 工学部, 教授 (60247434)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 回転機 / モータ / 電気自動車

Outline of Final Research Achievements

A new type of variable-flux permanent magnet motor, called the flux-modulating hybrid field motor (FHM), has been developed. The FHM consists of two stators (the armature and field poles) and one rotor incorporating iron pieces. The field poles comprise permanent magnets and electromagnets, and the magnetic flux of the electromagnets can be adjusted by changing the field current. In this study, a 0.8 kW prototype machine was fabricated, and the validity of the FHM's principle was confirmed through experiments and 3-D finite element analysis (3-D FEA). The influence of the relative position of the two stators on the machine constants was also clarified by 3-D FEA. These findings are useful for future designs of FHMs and their control systems.

Free Research Field

電気機器

Academic Significance and Societal Importance of the Research Achievements

本研究では，磁極から出る磁束を変化させ運転範囲を拡大できる新構造の永久磁石モータを開発し，その原理と設計法を与えている。EV向けトラクションモータの高効率化に寄与し，カーボンニュートラル実現に貢献できる。