基于转子再设计的电动汽车永磁同步电机再制造研究

随着电动汽车的发展,淘汰替换的旧电机越来越多,对旧电机的再制造研究也越发必要。通过对转子外圆优化以减小饱和磁密面积和优化气隙结构来提升电机性能,分析了不同偏心圆对电机齿槽转矩的影响规律,对比了旧电机和再制造电机的性能变化,研究了不同倒角圆对电机磁密谐波和齿槽转矩的影响趋势。结果表明电机齿槽转矩随着偏心圆的增大先增大后减小,不同倒角圆对再制造电机谐波影响较小;在额定情况下,再制造电机偏心圆为36 mm、倒角圆为4 mm时,再制造电机铁心损耗下降6.55 W/kg,再制造电机效率提高0.05%,输出转矩收缩4%,再制造电机在减小损耗提高效率的同时减小了输出转矩。

Remanufacturing of Permanent Magnet Synchronous Motor forElectric Vehicle Based on Rotor Redesign

With the development of electric vehicle, there were more and more old motor which would be replaced and obsoleted, it was also necessary to study the remanufacturing of the old motor. In order to improve the performance of the motor, the optimization of the outer circle of the rotor was used to reduce the saturation magnetic density area and optimize the air gap structure. How different eccentric circle effect on cogging torque was analyzed, the changes of performance of the old motor and the remanufacturing motor were compared. The magnetic flux density of motor harmonic and cogging torque trend with the different of chamfering circle was researched. The result showed that the cogging torque increased first and then decreased with eccentric circle increasing, chamfering circle had little influence on harmonic. Under the rated conditions, when the eccentric circle of remanufacturing motor was 36 mm and the chamfering circle was 4 mm, core loss of remanufacturing motor decreased by 6.55 W/kg, efficiency increased by 0.05% and output torque was reduced by 4%. The remanufacturing motor was made to reduce the loss and increase the efficiency, the output torque was reduced.