Abstract：Since the problem of lateral offset of primary and secondary linear motor will cause distortion of air-gap magnetic flux density, eddy current and force, the linear induction motor is studied and a three dimensional finite element model of linear induction motor is established. In order to analyze the influence of lateral offset，the distribution of eddy current in secondary aluminum and electromagnetic field in the motor are accurately calculated by the finite element method, so as to obtain the distribution of magnetic field, eddy current and stress on the plate surface. It is concluded that the degree of distortion increses greatly while offset increases. In order to quantify the degree of distortion, the distortion rate of longitudinal component of current density, the distortion rate of normal component of magnetic density and that of lateral force are put forward, and these rates are calculated and analyzed. Finally, a qualitative analysis is conducted on the reason why longitudinal torque will appear on the motor when the lateral offset occurs. Simulation results show that the degree of distortion of the above variables increases approximately linearly with the change of offset.
林庸,吕刚,周桐,张贤. 初级横向偏移时直线电机的特性分析[J]. 北京交通大学学报, 2018, 42(6): 104-.
LIN Yong, LYU Gang, ZHOU Tong, ZHANG Xian. Analysis of characteristics of linear motor with primary lateral offset. Beijing Jiaotong University, 2018, 42(6): 104-.