轮毂电机油冷却结构设计及分析

Design and Analysis of Oil Cooling Structure in Wheel Hub Motors

随着全球温室效应严重,电动车使用轮毂电机应用越来越广,对电机功率密度气压逐渐增加,电机尺寸并没有加大,电机越来越紧凑,体积小,重量轻尤为重要,散热困难,普通空冷已无法满足要求,导致电机温升增加,最终影响电机使用性能,因此现以196kW永磁轮毂同步轮毂电机为例,通过软件计算温度场,并通过不同油位下温度场进行分析,得出最佳的油位参数,评估电机性能。

Because of the serious global greenhouse effect,the wheel hub motor for electric vehicle is more and more widely used,and the power density requirement of which is gradually increased.The size of the motor has not increased,and the motor is more and more compact.It is particularly important for the motor with small size and light weight.The heat dissipation of the motor is difficult,so the ordinary air cooling has been unable to meet the requirements,which results in an temperature-rise increase of the motor and ultimately affects the performance of the motor.Therefore,this paper takes a 196kW permanent magnet synchronous wheel hub motor as an example to calculates the temperature field through software,analyzes the temperature field under different oil levels,obtains the best oil level parameters,and then evaluates the performance of the motor.