永磁直线同步电机非线性电感与推力波动的分析和补偿  

Analysis and compensation of the nonlinear inductance and thrust ripple in permanent magnet linear synchronous machine

作　　者：刘成颖[1] 沈祥明[1] 王昊[2] 

机构地区：[1]清华大学精密仪器与机械学系,北京100084 [2]北京理工大学机械与车辆工程学院,北京100081

出　　处：《清华大学学报（自然科学版）》2010年第12期1968-1973,共6页Journal of Tsinghua University(Science and Technology)

基　　金：国家"十一五"科技支撑计划(2006BAF01B09-05)

摘　　要：直线电机绕组电感的非线性特征会引起理想驱动电流下的输出推力波动,构成了一种扰动力并会降低位置跟踪精度。该文基于电机磁链理论进行计算和仿真,推导分析磁链和推力关于电感及电流的表达式和规律,设计实验测量恒定电流下的电机推力随位置的变化规律并进行对比验证,设计电流环补偿方法来改善电机的输出力波动。磁链和推力波动分析结果表明:采用THIII型样机在额定电流下推力波动最高可达2.9%;补偿仿真实验将非线性电感造成的推力波动的影响降至1 N以下,可见电流补偿后的推力谐波得到有效抑制。The evolution of the rotary motor into a linear motor has brought about excellent performance except for the asymmetric nonlinear inductance which causes extra thrust ripple which acts as disturbing force and leads to tracking errors.This paper presents a theoretical analysis and simulations based on magnetic linkage theory to analyze this phenomenon,with experiments to measure the thrust ripple and a compensation method.The analytical results for the linkage and thrust ripple shows that the ripple amplitude in the sample motor THIII was as high as 2.9%.The compensation simulation then reduced the ripple amplitude to less than 1 N.Thus,the effect of the nonlinear inductance on the thrust can be successfully compensated.

关 键 词：永磁直线电机 非线性电感 电枢反应反电势 推力波动 

分 类 号：TH705[机械工程—仪器科学与技术]