Analysis of Radial Force, Vibration, and Noise in Low-Speed, High-Torque Density Spoke-Type PMSMs with Symmetric and Asymmetric Assisted Poles Designs

Sayyed Haleem Shah;Yun-Chong Wang;Dan Shi;Jian-Xin Shen
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Abstract

This article investigates the radial electromagnetic force, vibration, and noise phenomenon in a low-speed, high-torque density spoke-type permanent magnet synchronous machine (ST-PMSM) designed with assisted poles having symmetric and asymmetric topologies. Firstly, an analytical expression for the machine radial electromagnetic force (REMF) is derived to quickly estimate the REMF characteristics for the ST-PMSM with assisted poles having symmetric and asymmetric topologies. The 2D-Fourier decomposition method is applied to investigate the radial electromagnetic force harmonics (REMFHs). Secondly, Finite element (FE) models are designed for the machine structural analysis. Subsequently, the FE models and modal analysis are explored for different design cases of the analyzed machine. Lastly, vibration and noise behavior are investigated using an FE approach for the machine designs under symmetric and asymmetric assisted poles topologies. The findings indicate an increase in the richness of REMFHs, alongside a decrease in both the fundamental frequency and the lowest nonzero order of REMF, attributed to the presence of asymmetric assisted poles. Consequently, it is investigated that while considering the vibration and noise response in ST-PMSMs designed with asymmetric assisted poles topologies, it is essential to thoroughly account for induced nonzero low-order harmonics and their optimization for better vibration and noise performance.
低速、高转矩密度辐条式永磁同步电机对称和非对称辅助杆设计的径向力、振动和噪声分析
本文研究了具有对称和非对称拓扑结构的辅助磁极设计的低速、高转矩密度辐条式永磁同步电机(ST-PMSM)的径向电磁力、振动和噪声现象。首先,推导了具有对称和非对称两种拓扑结构的辅助极的ST-PMSM径向电磁力的解析表达式,以快速估计其径向电磁力特性。采用二维傅里叶分解方法研究了径向电磁力谐波。其次,设计了机械结构有限元模型;随后,针对所分析机床的不同设计情况,进行了有限元模型和模态分析。最后,利用有限元方法研究了对称和非对称辅助极点拓扑下机械设计的振动和噪声特性。研究结果表明,由于不对称辅助极的存在,REMF的丰富度增加,同时基频和最低非零阶REMF的减少。因此,在考虑采用非对称辅助极点拓扑设计的st - pmsm的振动和噪声响应时,有必要彻底考虑诱导的非零低阶谐波及其优化,以获得更好的振动和噪声性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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