基于相电流平均值改进算法的九相永磁同步电机系统开路故障诊断

An Improved Mean Phase Currents Method of Open-circuited Faults Diagnosis for Nine-phase Permanent Synchronous Motor Systems

开路故障是多相永磁同步电机系统常见的电气故障,需要及时检测并精确定位,以保证多相电机系统及时切换至容错运行模式。该文针对H桥供电的多相永磁同步电机桥臂开路和绕组断相等常见开路故障,提出一种改进型相电流平均值算法。该方法将故障诊断变量由范围值改进为恒定值,无需再借助阈值辅助判断,同时有效避免了传统检测方法在空载及加载运行时的误诊断问题。最后,通过一台9kW九相永磁同步电机系统不同开路故障实验,验证了所提诊断方法的有效性。

The open-circuited faults are inevitable for the multi-phase permanent synchronous motor( PMSM) systems. It is necessary to detect and locate faults in time to switch to fault-tolerant mode. In this paper, an improved mean phase currents method is proposed to diagnose open-circuited faults of IGBT and phase for multi-phase PMSM systems. The fault diagnosis indices are improved from the range value to fixed value, without the aid of thresholds, and effectively avoids the misdiagnosis of traditional methods in no-load and load running conditions. Finally, the validity of the proposed method is verified by different open-circuited contrastive experiments of a 9kW nine-phase PMSM system.