Slot–pole Matching Selection for Magnetic Field Decoupling in Bearingless Permanent Magnet Slice Motors

WANG Haohui; WANG Yu

doi:10.13334/j.0258-8013.pcsee.241954

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Slot–pole Matching Selection for Magnetic Field Decoupling in Bearingless Permanent Magnet Slice Motors

更新时间：2026-07-13

- Slot–pole Matching Selection for Magnetic Field Decoupling in Bearingless Permanent Magnet Slice Motors
- Vol. 45, Issue 19, Pages: 7766-7775(2025)
- 作者机构：
  
  南京航空航天大学自动化学院,江苏省,南京市,211106
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.241954
  CLC：
- Published：2025
- 稿件说明：
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WANG Haohui, WANG Yu. Slot–pole Matching Selection for Magnetic Field Decoupling in Bearingless Permanent Magnet Slice Motors[J]. 2025, 45(19): 7766-7775.
DOI：

WANG Haohui, WANG Yu. Slot–pole Matching Selection for Magnetic Field Decoupling in Bearingless Permanent Magnet Slice Motors[J]. 2025, 45(19): 7766-7775. DOI： 10.13334/j.0258-8013.pcsee.241954.

摘要

无轴承永磁薄片电机(bearingless permanent magnet slice motor，BPMSM)的稳定运行需确保转子所受径向悬浮力平稳可控。现有BPMSM极槽配合选择方法未考虑磁场谐波间的耦合，导致悬浮磁场基波与永磁体相差一对极时仍存在悬浮力脉动。为解决该问题，该文首先基于磁场调制效应，对径向悬浮力的产生机理进行分析，确定两谐波产生悬浮力脉动需满足的条件；其次，对悬浮力脉动的产生原因进行分类，推导出高悬浮性能BPMSM极槽配合应满足的3个约束条件；随后，进行仿真验证，给出能够消除耦合关系的极槽配合，并从中选取一台6槽2极BPMSM加工和实验，验证该文所提出的极槽配合选择方法能够降低悬浮力脉动，提高悬浮性能。

Abstract

The stable operation of a bearingless permanent magnet slice motor (BPMSM) requires smooth and controllable radial suspension force. However

existing methods for slot/pole quantity selection cannot consider the coupling between magnetic field harmonics

leading to suspension force ripples when the fundamental wave of the suspension field harmonics differed from the permanent magnets by a pair of poles. To overcome this limitation

the generation mechanism of radial suspension force is analyzed based on the magnetic field modulation effect

and the conditions required for harmonic-induced ripples are determined. The causes of suspension force ripples are classified

and three constraints for selecting the slot/pole quantities to achieve high suspension performance are derived. Simulations are then conducted to identify feasible slot/pole matching selection that eliminates harmonic coupling. Finally

a 6-slot/2-pole BPMSM is manufactured and experimentally tested. Both simulation and experimental results verify that the proposed method can effectively reduce suspension force ripples and enhance the suspension performance of BPMSMs.

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