一种优化直流接触器电动斥力的改进方法  

An improved method for optimizing the electric repulsion of DC contactors

作　　者：夏林 迟长春(指导)[1] 陈晋生 XIA Lin;CHI Changchun;CHEN Jinsheng(School of Electrical Engineering,Shanghai Dianji University,Shanghai 201306,China)

机构地区：[1]上海电机学院电气学院,上海201306

出　　处：《上海电机学院学报》2022年第5期265-270,共6页Journal of Shanghai Dianji University

摘　　要：为了提高直流接触器的电动力稳定性,以电动汽车充电站直流接触器NDZ3T的触头系统在短路电流下受到的电动斥力作为研究对象,利用软件ANSYS仿真电动斥力,确定不同位置下圆形触头导电桥对电动斥力的影响,并在动触头之间添加不同厚度方形隔磁块以实现对电动斥力的优化。根据动触板上的磁场强度设计U形隔磁块,并对比其与方形隔磁块的优化效果。结果表明:隔磁块越厚,电动斥力越小,但优化效果逐渐降低;厚度一样的条件下,U形隔磁块对电动斥力的降幅影响比方形隔磁块至少多10%。仿真结果可为后续同类型不同功率的直流接触器提高短时耐受电流能力的研究提供参考依据。To improve the electrodynamic stability of the DC contactor,the electrodynamic repulsion of the contact system of the DC contactor NDZ3T used in the electric vehicle charging station under short-circuit current is taken as the research object.The software ANSYS is used to simulate the electric repulsion,determine the influence of the conductive bridge of the circular contact on the electric repulsion at different positions,and add square magnetic isolation blocks with different thicknesses between the movable contacts to realize the optimization of the electric repulsion.The U-shaped magnetic isolation block is designed according to the magnetic field strength on the movable contact board,and the optimization effect of the U-shaped magnetic isolation block is compared with that of the square one.The results show that the thicker the magnetic isolation block,the smaller the electric repulsion,but the optimization effect gradually decreases.Under the condition of the same thickness,the U-shaped magnetic isolation block has at least 10%more influence on the reduction of electric repulsion than the square magnetic isolation block.The experimental results can provide a reference for the subsequent research on improving the short-term withstand current capability of DC contactors of the same type and different powers.

关 键 词：直流接触器 电动斥力 隔磁块 

分 类 号：TM561[电气工程—电器]