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

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.