摘  要：分析了用于城市轨道交通的直线感应电机的结构特征及其等效电路，阐述了相关参数的计算方法，包括电机励磁电抗、效率、功率因素等，并应用Ansoft有限元软件，对一台直线感应电机样机进行了电磁分析。通过有限元仿真与分析，得出了电机内部电磁场的分布特点和规律，研究结果为直线感应电机电磁设计提供了理论基础。同时，仿真结果对今后电机控制系统的设计有着重要意义。
关键词：直线感应电机；等效电路；有限元分析法；推力；法向力；磁通线

Abstract: This paper discussed the structural characteristics of a linear induction motor(LIM)for urban rail transit as well as its equivalent circuit.After elaborating the calculation of some correlation parameter, including magnetizing reactance,efficiency and power factor,the author did an electromagnetic analysis with a sample LIM.The distribution characteristics of electromagnetic field was acquired by finite element simulation and it provided theoretical basis on electromagnetic design for LIM.Meanwhile,the simulation result would also be a significant reference to the future design of motor control system.
Key Words: Linear induction motor；Equivalent circuit；Finite element analysis；Thrust force；Normal force； Flux lines