初级横向偏移时直线感应电机磁场与推力的有限元分析  

Magnetic field and thrust analysis for linear induction motor with lateral displacement

作　　者：吕刚[1] 曾迪晖[1] 周桐[1] 刘志明[2] 孙守光[2] 

机构地区：[1]北京交通大学电气工程学院,北京100044 [2]北京交通大学机械与电子控制工程学院,北京100044

出　　处：《电机与控制学报》2016年第4期64-68,77,共6页Electric Machines and Control

基　　金：国家自然科学基金(51377009;U1134201)

摘　　要：由于振动以及弯道等原因,直线感应电机初级和次级经常处于横向偏移状态。考虑在此种工况下,电机拓扑结构和电气结构两个方面均为不对称情况,使用3-D有限元法,分析了直线感应电机的磁场以及推力的变化。首先,给出了直线感应电机的数值计算方法和边界条件,并建立了完整3-D模型来考虑纵/横向边缘效应、初级绕组端部与次级伸出缘等参数。其次,在此3-D模型基础上,计算了不同偏移量时纵/横向的磁场分布,以及讨论了半添槽对直线感应电机出力的影响,提出了纵向和横向磁场的畸变系数,用于量化不对称的程度。最后,计算了推力在对中和横向偏移情况下的变化,并分析了该变化对实际行车中牵引力和控制系统的影响。The single-sides linear induction motor（ SLIM） has been applied to the metro vehicle. When the vehicle runs on the turning rails,primary is displaced sideways from a symmetrical position. A full 3-D model,which considering the longitudinal and transverse end effects,overhangs of the primary windings and secondary,as well as lateral displacement,is developed. The air-gap flux densities along longitudinal and transverse direction with different lateral displacements are obtained. Then,influences of half-filled slots on the performance of the SLIM are analyzed,and distortion coefficients of the air gap flux density are proposed to calculate the asymmetry. Finally,thrusts of the SLIM are calculated when the asymmetry between the primary and secondary occurred,and the influence of the thrust variation on the train are debated.

关 键 词：直线感应电机 横向偏移 磁场畸变率 纵向边缘效应 横向边缘效应 三维有限元模型 

分 类 号：TM351[电气工程—电机] TP273[自动化与计算机技术—检测技术与自动化装置]