Investigation of Eccentric PM on High-Frequency Vibration in FSCW PM Machine Considering Force Modulation Effect

Q1 Engineering Chinese Journal of Electrical Engineering Pub Date : 2024-06-01 DOI:10.23919/CJEE.2024.000063

Jinghua Ji;Weizhi Jiang;Wenxiang Zhao;Tong Liu

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Abstract

This study investigates the negative influence of an eccentric permanent-magnet (PM) design on high-frequency electromagnetic vibration in fractional-slot concentrated-winding (FSCW) PM machines. First, an analytical expression for the sideband current harmonics was derived using the double Fourier series expansion method. Then, the characteristics of the flux-density harmonics are studied from the perspective of the space-time distribution and initial phase relationship. The influence of the eccentric PM design on high-frequency electromagnetic and concentrated forces was studied based on the electromagnetic force modulation effect. Consequently, an eccentric PM design is not conducive to reducing the $2p^{\text{th}}$ -order high-frequency electromagnetic forces. Finally, two FSCW PM machines with conventional and eccentric PM designs are manufactured and tested to verify the theoretical analysis. The results show that the eccentric PM design worsens high-frequency vibrations.

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考虑力调制效应的偏心永磁对 FSCW 永磁机械高频振动的影响研究

本研究探讨了偏心永磁（PM）设计对分数槽集中绕组（FSCW）永磁机械高频电磁振动的负面影响。首先，使用双傅里叶级数展开法得出了边带电流谐波的分析表达式。然后，从时空分布和初始相位关系的角度研究了磁通密度谐波的特性。基于电磁力调制效应，研究了偏心永磁设计对高频电磁力和集中力的影响。结果表明，偏心永磁设计不利于降低 2p^{\text{th}}$ 阶高频电磁力。最后，我们制造并测试了两台采用传统永磁设计和偏心永磁设计的 FSCW 永磁机械，以验证理论分析。结果表明，偏心永磁设计会加剧高频振动。

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