单稳态永磁真空断路器铁芯动态电磁力计算方法研究

Study on Dynamic Electromagnetic Force Calculation Method of Iron Core in Monostable Permanent Magnet Vacuum Circuit Breaker

永磁操动机构的分合闸运动是由动铁芯所受电磁力、部件重力及各种反力的共同作用引起的,其中动铁芯所受的电磁力呈现非线性变化,给断路器的分合闸控制研究带来了困难。计算并分析动铁芯运动过程中的动态电磁力,对于断路器智能控制研究有着重要意义。在ANSYS Maxwell中搭建永磁操动机构的电磁模型,计算并保存时刻场,分别用麦克斯韦张量法和虚功法对铁芯动态电磁力进行计算,对比两种方法的计算结果,验证其可行性,并对结果进行分析。

The closing and opening movement of the permanent magnet actuator(PMA)is caused by the combined action of the electromagnetic force,the gravity of the component and various reaction forces for the moving iron core.The electromagnetic force received by the moving iron core exhibits a nonlinear change,which brings difficulties to the research on the closing and opening control of the circuit breaker.It′s of great significance for the intelligent control research of circuit breakers to calculate and analyze the dynamic electromagnetic force during the movement of the moving iron core.The electromagnetic model of PMA is built by ANSYS Maxwell software,and the time field is calculated and saved.The dynamic electromagnetic force of the iron core was calculated by using the Maxwell tensor method and the virtual work method respectively.The results of the two methods are compared to verify its feasibility,and the results are analyzed.