Eccentricity Fault Analysis of Permanent Magnet Synchronous Motors Based on Airgap Field Modulation Theory

DING Shichuan; JIN Daichen; HANG Jun; CHENG Ming; LI Ya; SUN Le

doi:10.13334/j.0258-8013.pcsee.242173

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Eccentricity Fault Analysis of Permanent Magnet Synchronous Motors Based on Airgap Field Modulation Theory

更新时间：2026-02-28

- Eccentricity Fault Analysis of Permanent Magnet Synchronous Motors Based on Airgap Field Modulation Theory
- Vol. 46, Issue 4, Pages: 1640-1650(2026)
- 作者机构：
  
  1. 安徽大学电气工程与自动化学院,安徽省,合肥市,230601
  2. 东南大学电气工程学院,江苏省,南京市,210096
  3. 南京理工大学自动化学院,江苏省,南京市,210094
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.242173
  CLC：
- Published：2026
- 稿件说明：
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DING Shichuan, JIN Daichen, HANG Jun, et al. Eccentricity Fault Analysis of Permanent Magnet Synchronous Motors Based on Airgap Field Modulation Theory[J]. 2026, 46(4): 1640-1650.
DOI：

DING Shichuan, JIN Daichen, HANG Jun, et al. Eccentricity Fault Analysis of Permanent Magnet Synchronous Motors Based on Airgap Field Modulation Theory[J]. 2026, 46(4): 1640-1650. DOI： 10.13334/j.0258-8013.pcsee.242173.

摘要

该文基于气隙磁场调制理论实现了对永磁同步电机发生偏心故障时的电磁性能统一性分析，丰富和发展了气隙磁场调制理论。将偏心故障对气隙的改变抽象成“调制器”，并定义“偏心调制算子”，以体现偏心故障对电机气隙的影响，进而研究偏心故障对气隙磁场的调制作用，分析偏心故障对永磁同步电机空载反电势、电磁转矩、径向电磁力波、不平衡磁拉力及电感的影响。有限元仿真与实验结果表明，偏心故障产生的谐波对空载反电势几乎无有影响，但会产生转矩脉动，对电机的径向电磁力波和不平衡磁拉力会有严重影响，同时，气隙的变化也会造成电感变化。

Abstract

In this paper

the uniform analysis of the electromagnetic performance of the permanent magnet synchronous motor with eccentricity fault is realized based on the airgap field modulation theory

and the theory is enriched and developed. The air gap variation resulting from the eccentricity fault is abstracted as the “modulator”

and the “eccentricity modulation operator” is defined to reflect the influence of eccentric fault on the air gap of the motor. On this basis

the modulating effect of eccentricity fault on air gap magnetic field is studied

and the influence of eccentricity fault on back electromotive force

electromagnetic torque

radial electromagnetic wave

unbalanced magnetic pull

and inductance of permanent magnet synchronous motor is analyzed. The finite element simulation and experiment results show that the harmonics generated by eccentricity fault have almost no effect on the back electromotive force

but can produce torque pulsation

which has a serious impact on the radial electromagnetic force wave and the unbalanced magnetic pull of the motor. The change of air gap will also cause the inductance change.

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