定子斜槽月球车驱动电机性能的快速计算

通常采用3--D有限元方法分析斜槽电机的性能,但3--D模型剖分单元数目庞大、计算时间极长,对计算机性能要求也较高.为快速且准确地预测月表极限温度下月球车车轮驱动用斜槽电机的性能,提出了2--D几何模型耦合恒流源电路模型处理多截面模型中分段电机同槽导体电流相等以及定子斜槽的方法,并研究了计算精度的影响因素.针对一套永磁无刷直流电机方案,计算了齿槽转矩、空载感应电势和电磁转矩,并结合转子典型位置下气隙磁场沿电机轴向的分布特征以及谐波分析结果评估了计算精度.该方法的计算量较小,计算结果与3--D模型仿真结果、实测结果的比较表明了该方法的有效性.

Fast computation of the performance of lunar rover driving motor with skewed slots

The 3--D finite element method is adopted to study the performance of skewed slot motors conventionally. The number of meshed elements in 3--D finite element model is huge and the simulation progress is time-consuming. In order to predict the performance of skewed slot motors for lunar rover driving wheels in extreme temperatures on lunar surface, a circuit model with constant current source is coupled with the 2--D geometric model to make the conductor currents in the same slot equal to each other for segmentation motors in the multi-slice model; and the affecting factors of calculation accuracy including skew angle and segmentation number are analyzed. The cogging torque, no-load back-EMF, and electromagnetic torque are calculated for prototype parameters of a permanent magnet brushless DC motor. The calculation accuracy is evaluated on the basis of distribution characteristics and harmonic analysis of no-load and loaded air-gap magnetic field at typical rotor positions in the axial direction. The amount of calculation work in this method is small. The comparison of computing results with 3--D simulation results and experimental results indicate the effectiveness of the method.