基于等效次级的直线感应电机的电磁分析与参数辨识

摘要

This paper proposes a method of no-load test for the LIM based on equivalent secondary:back soft ferrite substitutes for back iron to eliminate secondary eddy current while the magnetizing inductance keeps constant.A two-dimensional model of electromagnetic field has been established so as to derive the impact of relative permeability on magnetizing inductance.Keeping the magnetizing inductance constant,the equivalent secondary is designed according to the equation between the relative permeability of the back plate and the magnetizing inductance.The proposed method has been validated via finite element calculation and experimentations.Moreover,the equation of magnetizing inductance has been simplified to some extend in mathematics which can fit the control strategy of the LIM.%提出一种基于等效次级的直线感应电机空载试验的方法:采用软磁铁氧体材料模拟次级背铁,达到电机次级电流为零、但励磁电感保持不变的空载试验要求.建立电磁场二维模型,解析计算次级材料相对磁导率对励磁电感的影响;在励磁电感不变的前提下,根据次级背板相对磁导率和励磁电感的解析式,设计等效次级的几何参数,通过有限元计算与试验测量进行验证.该文在数学上对励磁电感的表达式做了适当化简,使其能够适用于直线感应电机的控制.