高转矩永磁轮毂电机电感参数研究

Research on Inductance Parameters of High Torque Permanent Magnet In-wheel Motor

针对高转矩永磁轮毂电机,提出一种基于电机稳态运行的电感参数实验研究方法。为提高稳态下电感参数计算的准确性,给出了考虑铁耗因素的数学模型。对电感模型的敏感性分析表明,该方法在电流较大时具有较精确的测量结果;在电流较小时因对参数扰动较为敏感而误差较大。采用有限元法对一台12槽10极永磁轮毂电机的电感参数进行了计算,并在稳态下进行了实验研究。不同负载点的敏感性比较结果与理论分析相符,电感的实测结果与计算结果较为一致,验证了模型的正确性及方法的可行性。

A research method for inductance parameters was proposed based on a steady-state operation for high torque permanent magnet in-wheel motors. In order to improve calculation accuracy of the inductance under steady-state conditions,a mathematical model for inductance parameters considering iron losses was presented. The sensitivity analysis for inductances model showed that with this method,higher accuracy could be achieved under higher currents; and bigger errors could be generated under lower currents due to the inductance sensitivity to parameter disturbance. The inductances were analyzed by finite element method for a permanent magnet in-wheel motor with 12 slots and 10 poles,and the inductances of a prototype motor were investigated under steady-state conditions. The results of sensitivity comparisons under different load operation points accorded with the theoretical analysis. The experimental results were in agreement with the calculated results for inductance and the accuracy of the inductance model and the feasibility of the approach were also verified with experiment results.