Variable-Flux Outer-Rotor Permanent Magnet Synchronous Motor for In-Wheel Direct-Drive Applications

Chinese Journal of Electrical Engineering ›› 2018, Vol. 4 ›› Issue (1): 28-35.

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Variable-Flux Outer-Rotor Permanent Magnet Synchronous Motor for In-Wheel Direct-Drive Applications

Yaojing Feng^*, Fang Li, Shoudao Huang, Ning Yang

College of Electrical and Information Engineering, Hunan University, Changsha 410082, China

Online:2018-03-25 Published:2019-10-31
Contact: *E-mail: fengyaojing@hnu.edu.cn.
About author:Yaojing Feng was born in Hunan Province, China, in 1985. She received the Ph.D. degree in electrical engineering fro m Huazhong University of Science and Technology, Wuhan, China, in 2012. She is currently an Assistant Professor of electrical engineering with the College of Electrical and Information Engineering, Hunan University, Changsha, China. Her main research interests include permanent magnet machines, design and control of electrical motors, and electric vehicle (EV) drive systems. Fang Li was born in Hunan Province, China, in 1992. She received the B.S. degree from Huaqiao University, Quanzhou, China, in 2015. She is currently working towards the M.S. degree in electrical engineering from the College of Electrical and Information Engineering, Hunan University, Changsha, China. Her research area is design and analysis of permanent magnet machines for electric vehicles. Shoudao Huang was born in Hunan Province, China, in 1962. He received the Ph.D. degree in electrical engineering from Hunan University, Changsha, China, in 2005. He is currently a Professor of electrical engineering with the College of Electrical and Information Engineering, Hunan University, Changsha, China. His main interests include motor system and control, energy storage and energy saving, power electronics, and wind power technology. Ning Yang was born in Hunan Province, China, in 1994. He received the B.S. degree in electrical engineering from Hunan University of Science and Technology, Xiangtan, China, in 2016. He is currently working toward the M.S. degree in electrical engineering from the College of Electrical and Information Engineering, Hunan University, Changsha, China. His research area is design and control of electrical machines.
Supported by:
Supported by the National Natural Science Foundation of China under Grant 51407064.

Abstract

Abstract: In-wheel direct-drive is the most efficient driving mode for electric vehicles, and it is the trend for applications in the future. In this paper, a novel variable-flux outer-rotor permanent magnet synchronous motor with a hybrid magnetic structure design is developed. Due to the hybrid magnetic pole with Nd-Fe-B and Al-Ni-Co permanent magnet(PM), the air-gap flux can be adjusted by changing the magnetization states of Al-Ni-Co PM, which is beneficial to realize a wide range of speeds and loads from the electromagnetic structure design. Firstly, basic structure features of the motor and the flux-adjusting principle are introduced. The design and calculation method of the PM dimensions is derived based on magnetic circuit analysis. Then the Preisach hysteresis model of Al-Ni-Co PM is described and is adopted to analyze the motor performance with the coupling of the time step finite element method(FEM), and the magnetization are investigated. Finally, the operational performance of the proposed motor is obtained by simulation, which verifies the design.

Key words: Outer-rotor permanent magnet synchronous motor, variable flux, in-wheel direct-drive, magnetization, finite element method

Yaojing Feng, Fang Li, Shoudao Huang, Ning Yang. Variable-Flux Outer-Rotor Permanent Magnet Synchronous Motor for In-Wheel Direct-Drive Applications[J]. Chinese Journal of Electrical Engineering, 2018, 4(1): 28-35.

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Variable-Flux Outer-Rotor Permanent Magnet Synchronous Motor for In-Wheel Direct-Drive Applications

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