Title: Research on magnet structure design and torque performance optimisation of permanent magnet synchronous motors

Authors: Zhiqiang Wang; Chenxu Chen; Rui Dong; Xu Zhao; Salvinder Singh Karam Singh; Beilin Han

Addresses: School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 10336, China ' School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 10336, China ' School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 10336, China ' School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 10336, China ' Department of Mechanical and Manufacturing Engineering, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia ' School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 10336, China

Abstract: Based on the issues of substantial torque fluctuation, severe magnetic leakage, and low efficiency in conventional rectangular embedded permanent magnet synchronous motors (PMSM), this paper introduces an arc-trapezoidal magnet (ATM) structure aimed at enhancing the torque performance of the motor. Through comprehensive simulation analysis and experimental validation, the design parameters are optimised via orthogonal experimental, leading to the identification of the optimal parameter set. Experimental results reveal a 26.8% increase in average motor torque, a 51.2% reduction in torque fluctuation, and a significant improvement in the motor's output torque performance.

Keywords: permanent magnet synchronous motor; magnet structure design; torque performance optimisation; orthogonal experiment design.

DOI: 10.1504/IJHM.2026.154220

International Journal of Hydromechatronics, 2026 Vol.9 No.2, pp.155 - 186

Received: 21 Apr 2025
Accepted: 28 Aug 2025
Published online: 17 Jun 2026 *

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