关键词: 长定子直线同步电机, 磁悬浮列车, 磁路饱和, 电磁计算, 遗传算法

Abstract: In order to improve the efficiency and accuracy of LLSM design, the influence of magnetic saturation on
magnetic field and winding inductance was analyzed based on the erected parametric FEA model, and then the magnetic
leakage coefficient and armature winding inductance parameters were obtained based on fitting method. The air gap flux
density was obtained based on equivalent magnetic circuit considering magnetic saturation, after that the modified analytical
expressions of thrust force and levitation force with considering the magnetic saturation are obtained. In the same time, the
thrust ripple component caused by load was analyzed. The electromagnetic performances were calculated based on the
voltage state equation. The optimization design of LLSM was carried out by adopting improved genetic algorithm, and then
a design of high thrust force and low thrust ripple component caused by load was obtained.

Key words: long-stator linear synchronous motor ( LLSM ), maglev train, magnetic saturation, electromagnetic
calculation, genetic algorithm