为了深入研究直线旋转永磁作动器(linear and rotarypermanent magnet actuator,LRPMA)的参数对其力学和电磁性能的影响,基于磁标量位的磁场解析计算方法,对LRPMA进行了分析。采用曲率系数法和圆弧直线等效模型,对LRPMA的磁场分布进行了解析计算,采用三维有限元方法进行了验证。基于解析结果,得到不同的极弧系数和槽宽槽距比条件下LRPMA的直线定位力、旋转定位力矩、定子绕组磁链的基波分量和谐波分布云图。实验制作了LRPMA样机,样机的试验结果与解析计算优化结果基本一致,有效验证了所提解析方法的正确性和有效性。
This paper reports a new application of permanent magnet actuator for vacuum contactors.A novel permanent magnet(PM) actuator to drive a vacuum contactor with intrinsically safe and low supply voltage is proposed.PM is mounted on the static iron of the contactor to enhance its holding force and reliability.While only one coil is used to break the vacuum contactor,two series coils are deployed to yield a high magnetomotive force to realize the making operation.The electrical circuit equation,mechanical equation and magnetic field are all coupled in the simulation.A prototype is manufactured and tested to validate and showcase the performance of the contactor which is equipped with the proposed PM actuator.
