Design and Optimization of Permanent Magnet Linear Synchronous Motor for Direct Drive Multi-car Elevator Variable Rail System

In order to meet the needs of multi-car operation of long-stroke ropeless elevator, this paper uses 22-pole 24-slot permanent magnet linear synchronous motor (PMLSM ) as the driving source to determine the multi-car rail change scheme of elevator and the motor parameters that meet the operation requirements. The boot-type end teeth are added on both sides of the motor to improve the end effect of the motor and improve the operating stability to meet the requirements of the smooth operation of the motor. In order to maximize the effect of suppressing the end effect of the boot-shaped end teeth, the multi-objective optimization method of response surface method (RSM) combined with particle swarm optimization (PSM) is used to optimize the boot-shaped end teeth with thrust, thrust fluctuation and magnetic resistance as the optimization objectives. The electromagnetic characteristics of the motor are analyzed by finite element comparison, and the optimization results are verified by prototype experiments. The results show that the electromagnetic performance index of the optimized PMLSM is improved, and it can be better applied to the direct drive rail changing occasions.