Design and Analysis of a Permanent Magnet Vernier Machine with Non-Uniform Tooth Distribution

Fei Zhao, Mengzhu Cao, Encheng Tao and Liyi Li
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Fei Zhao: Power Electronics and Electrical Drives Center, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
Mengzhu Cao: Power Electronics and Electrical Drives Center, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
Encheng Tao: Power Electronics and Electrical Drives Center, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
Liyi Li: Institute of Electromagnetic and Electronic Technology, Harbin Institute of Technology, Harbin 150001, China

Energies, 2021, vol. 14, issue 22, 1-16

Abstract: To improve the torque performance of the permanent magnet vernier machine in the direct-drive system for Unmanned Aerial Vehicle (UAV), this paper proposes the topology of non-uniform tooth distribution. This distribution, considering the additional flux harmonics, aims to contribute to torque improvement, whereas the cogging torque also increases at the same time. A phasors method is proposed to solve the issue caused by the non-uniform structure, adjusting the mechanic angle of each tooth reasonably to restrict the cogging torque. In addition, the non-uniform design is illustrated in detail, which includes the method of grouping the teeth, considering the factors of series pole ratio and winding layout. By using the three-dimensional finite element method, torque is significantly increased without additional torque ripple, which satisfies the desired design target.

Keywords: cogging torque; magnetic flux harmonic; non-uniform tooth distribution; permanent magnet vernier machine (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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