基于周期性半模型的中低速磁浮用直线电机的性能计算分析

Periodic Half Model Based Performance Analysis of Linear Motor on Medium and Low Speed Maglev Train

中低速磁浮列车直线感应电机磁路不对称且受纵向及横向边端效应的影响,性能计算困难。文章分别采用磁路法、二维有限元法及三维有限元法进行了直线电机的牵引力及法向力计算,在全模型三维有限元仿真基础上提出采用周期性半模型有限元仿真方法进行电机性能仿真,并搭建了中低速磁浮列车直线电机静态测试平台进行测试验证。通过对比测试发现,周期性半模型三维瞬态有限元仿真测试的牵引力与平台测试结果偏差3.9%,与全模型有限元仿真结果一致;但与全模型方法相比,采用周期性半模型方法的计算时间可缩短约40%,这样既兼顾了电机特性计算的准确性,又提高了计算速度。基于周期性半模型方法可以在直线感应电机设计阶段实现计算的最高准确性,从而降低直线感应电机因无法进行台架性能测试所带来的设计风险。

Performance analysis of linear induction motor on medium and low speed maglev train is difficult because of its asymmetric magnetic circuit, longitudinal edge end effect and lateral side end effect. In this paper, traction force and normal force of linear induction motor of medium-low speed maglev train are calculated by magnetic circuit method, two-dimensional finite element method and three-dimensional finite element method respectively. Based on a full model three-dimensional finite element simulation, a periodic semi model finite element simulation is proposed, and a static test platform of medium and low speed maglev linear motor is built. Test results show that the deviation of traction force between periodic semi-model finite simulation results and test results is 3.9%, which is consistent with the full model finite element simulations results. Using the periodic half model method,the simulation time can be reduced by 40%, which not only gives consideration to derivation accuracy, but also increases calculation speed. Based on this method, the maximum accuracy of calculation can be achieved in design stage, and the design risk caused by the failure of dynamic performance test of linear induction motor can be reduced.