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<p>Thrust ripple in Permanent Magnet Linear Synchronous Motors (PMLSMs), caused by detent forces and harmonics in the Permanent Magnet (PM) flux linkage, is conventionally analyzed under no-load conditions, which neglects the critical effects of magnetic saturation that occur during on-load operation. To address this gap, this study employs the Frozen Permeability Method (FPM) to investigate the behavior of detent force and PM flux linkage under saturated, on-load conditions. For a comprehensive analysis, this study decomposes the detent force into cogging and end forces using two distinct analysis models. Based on this analysis, an improved model is proposed that utilizes three design variables to simultaneously suppress both the detent force and the harmonics in the PM flux linkage. The effectiveness of the proposed design is validated through Finite Element Method (FEM) simulations, demonstrating a 50.42% reduction in on-load thrust ripple and enhanced robustness against load variations compared to the base model.</p>

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Improvement of Thrust Ripple in PMLSMs Considering Magnetic Saturation Using the Frozen Permeability Method

  • 期刊论文

  • 发表日期：

    2026年1月28日

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  • In-Seok Song,
  • Taek-Hyo Nam,
  • Young-Ho Hwang,
  • Hyung-Woo Kim,
  • Seok-Won Jung,
  • Sang-Yong Jung

摘要

Thrust ripple in Permanent Magnet Linear Synchronous Motors (PMLSMs), caused by detent forces and harmonics in the Permanent Magnet (PM) flux linkage, is conventionally analyzed under no-load conditions, which neglects the critical effects of magnetic saturation that occur during on-load operation. To address this gap, this study employs the Frozen Permeability Method (FPM) to investigate the behavior of detent force and PM flux linkage under saturated, on-load conditions. For a comprehensive analysis, this study decomposes the detent force into cogging and end forces using two distinct analysis models. Based on this analysis, an improved model is proposed that utilizes three design variables to simultaneously suppress both the detent force and the harmonics in the PM flux linkage. The effectiveness of the proposed design is validated through Finite Element Method (FEM) simulations, demonstrating a 50.42% reduction in on-load thrust ripple and enhanced robustness against load variations compared to the base model.