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<p>This paper presents a spoke-type permanent magnet linear synchronous machine (PMLSM) with an asymmetric mover structure designed to reduce detent force and thrust ripple. The proposed design incorporates three techniques: an asymmetric magnet arrangement to induce harmonic phase cancellation, magnet skewing for spatial harmonic suppression, and a magnet overhang structure to compensate for thrust reduction. The proposed design was applied to two pole-slot combinations, 6-pole/9-slot and 12-pole/9-slot, for performance comparison under identical operating conditions. The electromagnetic performance of the proposed mover was evaluated in detail using a three-dimensional finite element method (3D FEM) analysis. The results show that, for the 6-pole/9-slot model, the detent force and thrust ripple were reduced by 92.17% and 82.87%, respectively, compared with the symmetric baseline model, while for the 12-pole/9-slot model, the reductions were 92.11% and 91.5%, respectively. In both cases, the average thrust was maintained at a level comparable to that of the symmetric baseline model.</p>

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Asymmetric Mover Design for Mitigating Detent Force and Thrust Ripple of Spoke-Type Permanent Magnet Linear Synchronous Machine

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Hyeon-Taek Oh,
  • Jong-Seok Seon,
  • Han-Kyeol Yeo

摘要

This paper presents a spoke-type permanent magnet linear synchronous machine (PMLSM) with an asymmetric mover structure designed to reduce detent force and thrust ripple. The proposed design incorporates three techniques: an asymmetric magnet arrangement to induce harmonic phase cancellation, magnet skewing for spatial harmonic suppression, and a magnet overhang structure to compensate for thrust reduction. The proposed design was applied to two pole-slot combinations, 6-pole/9-slot and 12-pole/9-slot, for performance comparison under identical operating conditions. The electromagnetic performance of the proposed mover was evaluated in detail using a three-dimensional finite element method (3D FEM) analysis. The results show that, for the 6-pole/9-slot model, the detent force and thrust ripple were reduced by 92.17% and 82.87%, respectively, compared with the symmetric baseline model, while for the 12-pole/9-slot model, the reductions were 92.11% and 91.5%, respectively. In both cases, the average thrust was maintained at a level comparable to that of the symmetric baseline model.