中低速磁浮列车速度对直线感应电机牵引力影响

Effect of Train Speed on Traction of Linear Induction Motor for Medium-low Speed Maglev Train

摘要:

结合中低速磁浮列车工程应用的电机结构参数，基于准一维理论建立气隙磁场数学模型，分析运行速度与电机气隙磁场之间的关系，然后采用有限元仿真从气隙磁场、次级涡流和牵引力3个方面对数学模型进行验证。结果表明，列车速度会影响电机的纵向动态端部效应（LDEE），导致气隙磁场产生畸变，并在次级感应板上的电机入端、出端区域产生涡流，使电机推力下降、效率降低。对比电机端部半填充槽结构和全填充槽结构的纵向动态端部效应，半填充槽结构的电机牵引力受速度影响更严重。

Abstract:

Based on the quasi one-dimensional theory， the mathematical model of air-gap magnetic field was established with the actual motor parameters of medium-low speed maglev train to analyze the relationship between the running speed and the air-gap magnetic field of the motor. Then the mathematical model is verified from three aspects of air-gap magnetic field， secondary eddy current and traction by using finite element simulation. It is shown that the train speed affects the longitudinal dynamic end effect（LDEE） of the motor to distort the air-gap magnetic field. And the eddy current is generated at the entrance and exit regions of the motor on the secondary induction plate， which reduces the thrust and efficiency of the motor. By comparing the longitudinal dynamic end effect of half-filled slot structure and full-filled slot structure， the traction force of the half-filled slot structure is more seriously affected by the speed.