牵引电机轴向空冷通风冷却温度场分析

Temperature Field Analysis of Axial Air Cooling Ventilation Cooling of Traction Motor

重型装备尤其是采矿、农业、施工和材料处理行业使用的机器,其复杂性正在迅速提升,永磁材料和电机制造技术的进步,永磁无刷直流电机的功率密度不断提高。这意味着电机的电磁负载不断增加,热负载急剧上升,电机的热设计变得越来越重要。本文以某大型矿用电动车轮牵引电机为例,基于流体力学以及传热学理论,结合电机通轴向风性能以及结构特点,建立了电机三维流动与传热耦合求解的有限元模型;并给出基本假设与相应的边界条件,通过计算电机内部的电磁场和温度场,采用有限体积法对三维流体场和温度场控制方程进行耦合,不需要假定模型之间的换热系数边界条件,能够获得更加精确的温升及冷却结果。在此基础上,分析了不同工况下的电机温度场。这种新的分析方法将有助于电机的散热优化设计,为更大功率的电机综合物理场的准确计算提供了理论依据。

The complexity of heavy equipment,particularly machines used in the mining,agricultural,construction and material handling industries,is rapidly increasing.With permanent magnetic materials and motor manufacturing technique progressing,permanent magnet brushless DC motor power density enhances unceasingly.This means that the electromagnetic loads of the motor are continuously increasing,and the heat load is soaring.The motor thermal design is becoming more and more important.a large mine electric wheel traction motor was taken as an example.On the basis of hydromechanics and heat transfer theory,the basic assumptions and corresponding boundary conditions were given.The governing equation of electromagnetic field and temperature field was calculated coupled using finite volume method.The finite volume method was used to couple the governing equations of three-dimensional fluid field and temperature field,and it is not necessary to assume the boundary conditions of heat transfer coefficient between models,so more accurate temperature rise and cooling results can be obtained.On this basis,the motor temperature field under different working conditions was analyzed.This new analysis method will help to optimize the heat dissipation design of the motor and provide a theoretical basis for the accurate calculation of the integrated physical field of the higher power motor.