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<p>For a 48-slot, 8-pole permanent magnet synchronous motor (PMSM) in automotive applications, the eighth-order force wave, as the most prominent low-order harmonic apart from the 0th-order, is a significant source of noise, vibration, and harshness (NVH) issues. This paper elucidates the generation mechanism of this eighth-order force wave, establishing its relationship with harmonic orders and time–frequency characteristics. A systematic analysis of the roles of both the eighth-order radial and tangential force waves is conducted, revealing that the tangential component is more influential in exciting the eighth-order spatial NVH mode. Furthermore, the corresponding eighth-order modal shape of the stator is investigated. To suppress the NVH induced by this force wave, an improved design featuring concave structures on the stator teeth is proposed. The effectiveness of this method is validated experimentally.</p>

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The mechanism and improvement of the effect of nonzero-order low eighth-order force waves on NVH of permanent magnet synchronous motor

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Kai Zhao,
  • Zhihui Jin,
  • Jian Luo

摘要

For a 48-slot, 8-pole permanent magnet synchronous motor (PMSM) in automotive applications, the eighth-order force wave, as the most prominent low-order harmonic apart from the 0th-order, is a significant source of noise, vibration, and harshness (NVH) issues. This paper elucidates the generation mechanism of this eighth-order force wave, establishing its relationship with harmonic orders and time–frequency characteristics. A systematic analysis of the roles of both the eighth-order radial and tangential force waves is conducted, revealing that the tangential component is more influential in exciting the eighth-order spatial NVH mode. Furthermore, the corresponding eighth-order modal shape of the stator is investigated. To suppress the NVH induced by this force wave, an improved design featuring concave structures on the stator teeth is proposed. The effectiveness of this method is validated experimentally.