U型永磁开关磁链直线电机特性分析及优化

Characteristic analysis and optimization of U-type permanentmagnet flux-switching linear motor

针对长行程无绳提升系统提出一种U型永磁开关磁链直线电机(UPM-FSLM)的拓扑结构,通过改变永磁体的位置排列、初级槽型与次级齿形,提高推力密度与功率因数,降低推力波动。首先介绍了UPM-FSLM的基本参数尺寸设计和工作机理。然后建立有限元仿真模型,分析静态磁场分布、反电动势、电磁推力、推力波动、效率及功率因数等电磁特性并与传统永磁开关磁链直线电机(PMFSLM)电磁性能进行对比研究。最后有限元仿真结果表明:相较于PMFSLM,UPM-FSLM具有高推力密度、低推力波动、高结构强度以及高电磁兼容性能等优势,更适合用于长行程的无绳提升系统。

In this paper,a U-shaped permanent magnet flux-switching linear motor(UPM-FSLM)topology is proposed for long-stroke ropless elevator systems.It changed the positional arrangement of the permanent magnets and the slotted shape of the stator,and improved the thrust density and power factor of this motor.The operation principle and basic parameter size design of UPM-FSLM are introduced.By establishing a 2D finite element simulation model,it analyzed electromagnetic characteristics such as static magnetic field distribution,No-load back-EMF,electromagnetic thrust,magnetic resistance,and thrust fluctuations.It was compared with the electromagnetic performance of a permanent magnet flux-switching linear motor(PMFSLM).The simulation results by means of finite-element analysis(FEA)verify that UPM-FSLM is with higher thrust density,lower thrust fluctuation,and higher structural strength,and especially suitable for long-stroke ropless elevator systems.