Thrust Ripple Analysis and Precise Modeling of 12/13 Slot-Pole Linear Flux-Switching Permanent Magnet Motors

CES Transactions on Electrical Machines and Systems Pub Date : 2025-12-01 DOI:10.30941/CESTEMS.2025.00036

Qi Wang;Ke Wang;Dihui Zeng;Lu Zhao;Wei Xu;Yaohua Li

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Abstract

Linear flux-switching permanent magnet motors (LFSPMs) have been proposed for long stator applications such as rail transit. However, the conventional linear permanent magnet synchronous motor (LPMSM) suffers from thrust ripple, which degrades the motor performance. The thrust ripple in LFSPMs is mainly caused by detent force and asymmetric electromagnetic parameters, excluding external disturbances. Moreover, the 12/13 slot-pole LFSPM exhibits unique inductance characteristics, which lead to different effects on thrust ripple. First, the detent force in the LFSPM is analyzed through finite element method (FEM). In addition, new finite element (FE) models are proposed for further analysis of the cogging force in LFSPMs. Second, the unique inductance characteristics of the 12/13 slot-pole LFSPM are investigated, and then the thrust ripple caused by asymmetric electromagnetic parameters is calculated by the virtual displacement method. Third, the mathematical model considering the thrust ripple is established for the LFSPM, which provides a foundation for subsequent research on thrust ripple suppression control strategies. Finally, the thrust ripple analysis is validated by comparing FEM results, modeling simulations, and experimental data.

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12/13槽极线性磁通开关永磁电机推力脉动分析及精确建模

线性磁通开关永磁电机（LFSPMs）已被提出用于长定子应用，如轨道交通。然而，传统的直线永磁同步电机存在推力脉动问题，影响了电机的性能。LFSPMs的推力脉动主要是由制动力和非对称电磁参数引起的，不包括外部干扰。此外，12/13槽极LFSPM具有独特的电感特性，从而对推力脉动产生不同的影响。首先，采用有限元法对LFSPM的缓冲力进行分析。此外，还提出了一种新的有限元模型，用于进一步分析lfspm的齿槽力。其次，研究了12/13槽极LFSPM独特的电感特性，利用虚位移法计算了非对称电磁参数引起的推力脉动。第三，建立了考虑推力脉动的LFSPM数学模型，为后续推力脉动抑制控制策略的研究奠定了基础。最后，通过对比有限元分析结果、模型仿真结果和实验数据，验证了推力脉动分析的正确性。

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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CES Transactions on Electrical Machines and Systems

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