永磁同步电机不对称运行负序分量特性分析

Negative Sequence Component Characteristics Analysis of PMSM under Asymmetry Operation Condition

定子故障、转子故障以及其它原因均有可能引起永磁同步电机定子不对称运行,以往文献更多关注于常规电机某种故障下的负序电流分量,并未对负序分量进行全面的分析。以电动汽车驱动用永磁同步电机作为研究对象,建立了其仿真模型和实验平台,对定子绕组三相不平衡故障引起的不对称运行状态下的负序电流和负序阻抗进行了较为深入的研究。实验和仿真分析结果表明,随着故障不平衡度的增加,非故障相之间的夹角越来越偏离120°;故障状态下的负序电流远大于正常运行时的负序电流;故障状态下的负序阻抗远小于正常运行时的负序阻抗,且具有一定的鲁棒性。这些结论的获得为基于负序分量的永磁同步电机故障下的诊断提供了研究基础。

Stator fault, rotor fault and other faults are likely to cause permanent magnet synchronous motor（PMSM） asymmetric operation, which results negative sequence component. In the existing literatures, they focus more on negative sequence current resulting from a certain fault of the conventional motor fault, and focus little on a comprehensive analysis of the negative sequence component. In this paper, the simulation model and experimental platform of the electric vehicle drive motor is established as the research object, in order to further study negative sequence current and negative sequence impedance under asymmetry operation condition caused by the stator windings of three phase unbalanced. The experimental and simulation results show that the angle between non-fauh phase deviates more from 120~ along with the increase of PMSM unbalanced degree; the negative sequence current under fault condition is far greater than the negative sequence current during normal operation; the negative sequence impedance under fault condition is far less than the normal operation and have more robustness. These conclusions provide the basis for the study of permanent magnet synchronous motor fault diagnosis based on negative sequence component.