Permanent Magnet Assisted Synchronous Reluctance Motor with Asymmetric Rotor for High Torque Performance

Chengwu Diao1; Wenliang Zhao1; Yan Liu2; Xiuhe Wang1

1. Shandong University, Jinan, China

2. China Aviation Control System Research Institute, Wuxi, China

C. Diao, W. Zhao, Y. Liu and X. Wang, "Permanent Magnet Assisted Synchronous Reluctance Motor with Asymmetric Rotor for High Torque Performance," in CES Transactions on Electrical Machines and Systems, vol. 7, no. 2, pp. 179-186, June 2023, doi: 10.30941/CESTEMS.2023.00016.

摘 要

永磁辅助同步磁阻电机（PMA-SYNRM）是现代工业中广泛应用的一种高转矩密度能量转换装置。本文基于PMA-SYNRM的基本拓扑结构，提出了一种新型的位置偏置磁铁非对称转子PMA-SYNRM。采用位置偏置磁铁的非对称转子设计，实现了磁力线在电机气隙中的集中，获得较高的电磁转矩，并使磁阻转矩在相同的电流相位角处均达到峰值。用空间矢量图对非对称转子构型进行了理论说明，验证了电机高转矩性能的可行性。通过有限元仿真，分析了转子非对称设计下侧壁对输出转矩和Mises应力的影响。然后计算了基本PMA-SYNRMS和提出的PMA-SYNRMS的电机特性，包括气隙磁通密度、反电动势、磁转矩、磁阻转矩、转矩脉动、损耗和效率。结果表明，所提出的PMA-SYNRM比基本拓扑具有更高的转矩和效率。此外，采用谐波电流注入的方法减小了PMA-SYNRM的转矩脉动，并对整个电流周期的转矩特性进行了分析。最后，根据永磁体剩磁计算，确定了避免永磁体退磁的耐久性。

Abstract

Permanent magnet assisted synchronous reluctance motor (PMA-SynRM) is a kind of high torque density energy conversion device widely used in modern industry. In this paper, based on the basic topology of PMA-SynRM, a novel PMA-SynRM of asymmetric rotor with position-biased magnet is proposed. The asymmetric rotor design with position-biased magnet realizes the concentration of magnetic field lines in the motor air gap to obtain higher electromagnetic torque, and makes both of magnetic and reluctance torque obtain the peak value at the same current phase angle. The asymmetric rotor configuration is theoretically illustrated by space vector diagram, and the feasibility of high torque performance of the motor is verified. Through the finite element simulation, the effect of the side barrier on output torque and the Mises stress under the rotor asymmetrical design are analyzed. Then the motor characteristics including airgap flux density, back EMF, magnetic torque, reluctance torque, torque ripple, losses, and efficiency are calculated for both the basic and proposed PMA-SynRMs. The results show that the proposed PMA-SynRM has higher torque and efficiency than the basic topology. Moreover, the torque ripple of the proposed PMA-SynRM is reduced by the method with harmonic current injection, and the torque characteristics in the whole current cycle are analyzed. Finally, the endurance to avoid PM demagnetization is confirmed based on the PM remanence calculation.

作者信息

Chengwu Diaowas born in China on April 1995. He received the B.S. degree and M.E degree in electrical engineering from Shenyang University of Technology, Shenyang, China, in 2018 and 2021. He is currently working toward the Ph.D. degree in the School of Electrical Engineering, Shandong University, Jinan, China. His current research interests include design, analysis and control of electrical machines.

Wenliang Zhao(S'14–M'16) was born in China on May 1987. He received the B.S. degree in control science and engineering from Harbin Institute of Technology, China, in 2011, and the Ph.D. degree in electronic systems engineering from Hanyang University, South Korea, in 2015. From 2015 to 2016, he was a Postdoctoral Fellow with Hanyang University, South Korea. In 2016, he joined the School of Electrical Engineering, Shandong University, as a Research Professor. Since 2020, he has been a Full Professor of Shandong University. He has authored or coauthored more than 100 papers on the topics of his research interests, which include design, analysis and control of electrical machines and power transformers.

Yan Liuwas born in China on November 1994. He received the B.S. degree from China University of Mining and Technology, Xuzhou, China, in 2018, and M.E degree from Shandong University, Jinan, China, in 2021. He is currently working in China Aviation Control System Research Institute, mainly engaged in the field of motor design.

Xiuhe Wangwas born in China on July 1967. He received the B.E. and M.E. degrees from Shandong University, Jinan, China, in 1989 and 1993, respectively, and the PhD degree from Shenyang University of Technology, Shenyang, China, in 1996. From 2001 to 2002, he was a Postdoctoral Fellow with Seoul National University, Seoul, South Korea. He is currently a Professor of electrical engineering and the Vice Head of the School of Electrical Engineering, Shandong University. His research interests include permanent magnet machines, energy-efficient machines, theoretical analysis and calculation of electromagnetic devices, and their application on electrical machines. He has authored/co-authored more than 100 papers on these topics.

《中国电工技术学会电机与系统学报（英文）》(CES TEMS)是中国电工技术学会和中国科学院电工研究所共同主办、IEEE PELS学会技术支持的英文学术期刊。期刊发表国内外有关高性能电机系统、电机驱动、电力电子、可再生能源系统、电气化交通等研发及应用领域中原创、前沿学术论文。中国工程院院士马伟明担任主编，IEEE的执委Don Tan博士为国际主编。目前已被Scopus、 Inspec、Google scholar、IEEE Xplore、中国科学引文数据库(CSCD) 核心版、DOAJ、CSTPCD、知网、万方、维普等数据库收录。

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