In the three-phase permanent magnet synchronous motor (PMSM) and its control system, the fault of the open or short circuit of the power semiconductor device, loss of the driving signal and the issue of the open circuit for cable connecting the PMSM and the inverter may often occur. This article proposes a fault-tolerant control strategy for the PMSM based on the four-leg inverter, which can maintain the stable operation of PMSM if there is a certain phase fault in the power semiconductor device, driving signal or stator winding. In the healthy mode, the 3D-SVM method is adopted to make four legs put into operation, and the neutral line current is used to compensate for the fault-tolerant operation of the PMSM in case of a certain phase fault. This article treats the PMSM, four-leg inverter and fault-tolerant control strategy as a system for simulation and analysis, which can obtain the variation rules of the internal magnetic field, loss and temperature field of the PMSM before and after fault tolerance. Furthermore, this article focuses on investigating whether the fault-tolerant operating condition will bring the potential negative impact of the PMSM thermal failure. Finally, the correctness of the analysis in this article is verified through experiments.

中文翻译：

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基于四腿逆变器容错控制的永磁同步电机电磁场和温度场计算与分析

在三相永磁同步电机（PMSM）及其控制系统中，功率半导体器件开路或短路故障、驱动信号丢失以及连接永磁同步电机和电机的电缆断路问题。逆变器可能经常发生。本文提出了一种基于四桥臂逆变器的永磁同步电机容错控制策略，当功率半导体器件、驱动信号或定子绕组出现一定相位故障时，可以保持永磁同步电机稳定运行。在健康模式下，采用3D-SVM方法使四支路投入运行，利用中性线电流补偿PMSM在某一相故障情况下的容错运行。本文讨论 PMSM，四桥臂逆变器和容错控制策略作为系统进行仿真分析，可以获得容错前后永磁同步电机内部磁场、损耗和温度场的变化规律。此外，本文重点研究容错运行条件是否会带来 PMSM 热故障的潜在负面影响。最后通过实验验证了本文分析的正确性。