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This paper investigates the torque quality of permanent magnet motors in electric power steering (EPS) systems, conducting a detailed analysis of cogging torque and load torque ripple characteristics. Comparing two optimisation strategies—permanent magnet eccentric pole shaping and segmented skewed poles on the rotor—it examines the suppression effects of varying eccentric pole offsets, the number of skewed pole segments, and skewed pole angles on cogging torque and torque ripple. The research demonstrates that both eccentric pole-slotting and segmented skewed poles effectively reduce cogging torque and diminish torque ripple. Through eccentric pole-slotting and a four-segment axial skewed pole configuration (with a skew angle of 23°), the optimised EPS motor achieves a cogging torque of 3 mNm, a load torque ripple of 0.76%, and significantly suppressed air gap magnetic flux density harmonics.

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Electromagnetic Design of High Torque Quality EPS Motor

  • 会议论文

  • 发表日期：

    2026年

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  • Hairuo Hu,
  • Xingxi Li,
  • Daofu Zhuang,
  • Ying Dai

摘要

This paper investigates the torque quality of permanent magnet motors in electric power steering (EPS) systems, conducting a detailed analysis of cogging torque and load torque ripple characteristics. Comparing two optimisation strategies—permanent magnet eccentric pole shaping and segmented skewed poles on the rotor—it examines the suppression effects of varying eccentric pole offsets, the number of skewed pole segments, and skewed pole angles on cogging torque and torque ripple. The research demonstrates that both eccentric pole-slotting and segmented skewed poles effectively reduce cogging torque and diminish torque ripple. Through eccentric pole-slotting and a four-segment axial skewed pole configuration (with a skew angle of 23°), the optimised EPS motor achieves a cogging torque of 3 mNm, a load torque ripple of 0.76%, and significantly suppressed air gap magnetic flux density harmonics.