线间补偿型匝间短路故障自动容错永磁同步电机故障位置检测方法

Fault Location Detection Method for Inter-Line Compensation Permanent Magnet Synchronous Motor with Automatic Inter-Turn Short Circuit Fault Tolerance

定子绕组匝间短路故障是永磁同步电机(PMSM)最常见的故障之一。该故障会造成三相电流不平衡,输出转矩剧烈波动,输出能力下降。故障严重时,过大的短路电流会烧毁绕组。为了解决匝间短路故障产生的问题,课题组此前提出了一种具有匝间短路故障自动容错能力的PMSM。针对该特种电机,提出了一种匝间短路故障位置的检测方法。介绍了电机的特殊结构,并通过数学模型推导出利用电机漏磁路特性和原有定子线圈判别故障线圈所在相的方法。使用ANSYS软件建立电机有限元模型,对电机不同匝间短路情况进行仿真,验证了该检测方法的正确性。

The stator winding inter-turn short circuit fault is one of the most common faults of permanent magnet synchronous motor(PMSM).This fault will cause unbalanced three-phase currents,leading to violent fluctuation of output torque and decreasing the output capacity.When the fault is serious,excessive short-circuit current will burn the winding.In order to solve the above problems caused by inter-turn short circuit faults,a PMSM with automatic inter-turn short circuit fault tolerance has been proposed.A detection method for inter-turn short circuit fault location is proposed for this special motor.The special structure of the motor is introduced,and then the method of judging the phase of the fault coil by the characteristics of the magnetic leakage circuit and the original stator coil is deduced through the mathematical model.Finally,the finite element model of the motor is established by ANSYS software,and the simulation of different inter-turn short circuit cases of the motor verifies the correctness of the detection method.