摘  要：针对笼型异步电动机的断相故障，以一台三相鼠笼异步电动机为例，建立了电动机的场路耦合时步有限元计算模型。通过对电动机带额定负载起动至稳态再到A相断相运行的整个过程进行仿真计算，分析研究了断相工况，讨论了断相对电机转矩、转速、定转子电流及损耗的影响。
关键词：异步电动机；断相；场路耦合；时步有限元分析

Abstract: Researched the open-phase failure of squirrel cage induction motor,estblished the field-circuit coupling time-stepping FEM model.Calculated and analysed the whole process from start up with rated load to openphase after steady condition.Discussed the torque,the speed,the current and the loss of the motor.
Key Words: Induction motor；Open-phase；Field-circuit coupling；Time-stepping FEM