Design and analysis of a high-performance surface inset permanent magnet motor with asymmetrical rotor

Issue title: Selected papers from the International Symposium on Applied Electromagnetics and Mechanics - ISEM 2019

Guest editors: Jinhao Qiu, Ke Xiong and Hongli Ji

Article type: Research Article

Authors: Zhao, Wenliang^a; | Liu, Cong^a | Li, Yujing^a | Fan, Xue^{a; b} | Wang, Xiuhe^a

Affiliations: [a] School of Electrical Engineering, Shandong University, Jinan, China | [b] School of Information Science and Engineering, University of Jinan, Jinan, China

Correspondence: [*] Corresponding author: Wenliang Zhao, School of Electrical Engineering, Shandong University, No. 17923, Jingshi Road, Jinan, 250061, Shandong, China. Tel: +86 13953135625; E-mail: wlzhao@sdu.edu.cn

Abstract: This paper presents a novel design strategy for surface inset permanent magnet (SIPM) motors to suppress torque pulsations and maintain the high output torque by integrating the magnet skewing and asymmetrical rotor configurations. The magnet skewing is implemented within one magnet pole pitch to reduce cogging torque by avoiding excessive torque degradation, and the asymmetrical rotor is designed to improve the utilization of the torque components, thus to compensate the decreased torque due to the magnet skewing. To highlight the advantages of the proposed motor, a conventional SIPM motor is adopted for performance comparison with the aid of the finite element method. As a result, the proposed SIPM motor highly reduced the cogging torque (−79.7%) and torque ripple (−54.7%) while maintaining a high average torque when compared to the conventional SIPM motor.

Keywords: Asymmetrical rotor, finite element method, magnet skewing, surface inset permanent magnet motors, torque pulsations

DOI: 10.3233/JAE-209324

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 64, no. 1-4, pp. 211-220, 2020