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

Abstract

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.

Keywords

• linear induction motor
• maglev train
• fem
• magnetic circuit method
• periodic half model