确定自起动永磁电机最小转矩的时步有限元仿真实验方法

自起动永磁电机的最小转矩是评价其启动能力的一个重要指标，根据解析方法所得的光滑转矩-转速（T-s）曲线虽然可得到其具体数值，但其计算条件与实际起动过程差别很大；能够准确反映诸多实际影响因素的时步有限元计算得到的T-s曲线是急剧波动的曲线，据此难以获得最小转矩的具体数值。该文研究工作的目的在于，不对该转矩曲线进行人为处理而获得最小转矩。首先研究在什么计算条件下能得到反映出最小转矩影响的转矩曲线，揭示了在某些计算条件下可能出现的最小转矩被“淹没”的现象；进而提出用以确定最小转矩的优化加载时步有限元仿真实验方法。通过将实例计算所得转矩曲线与实测曲线对比，表明计算结果可信。

Time-stepping Finite Element Simulation Experimental Method of Determining Line-start Permanent Magnet Motor Minimal Torque

The minimal torque(Tmin) of a line-start permanent magnet motor(LSPMM) is one of the most important indexes evaluating self-startup ability.The value of minimal torque can be obtained from smooth torque-speed curve(T-s) according to approach method;but there are many differences between the calculation condition and the actual condition in the starting process;The finite element method(FEM) which can consider the many practical factors could give a much more accurate T-s curve,but it is difficult to obtain ...