混合动力车用皮带驱动式分块转子开关磁阻起动/发电机的稳态热分析

Steady-thermal analysis of a belt-driven switched reluctance starter/generator(SRS/G) with segmental rotors for hybrid electric vehicles

热分析是设计电机的重要环节之一,因为绕组及定转子铁心温度过高将导致绕组绝缘层的破坏,进而使得电机运行失败,缩短电机使用寿命.以一种混合动力车用皮带驱动式分块转子开关磁阻起动/发电机为对象,研究此电机在峰值功率、额定功率和最高转速等3种不同工况下的稳态温度分布情况.首先利用电磁场有限元软件ANSOFT,计算电机定转子铁损以及绕组铜损,然后将其转化为生热率加载到ANSYS Workbench的稳态热分析模块中.为了更加精确地模拟电机温度场分布情况,给出了绕组的等效导热系数及电机各部件的表面对流换热系数.通过对有限元计算结果的分析,得出一些有益结论,为设计安全可靠的皮带驱动式分块转子开关磁阻起动/发电机奠定了一定理论基础.

Thermal analysis is an important step for designing the motor,for overheated windings and cores could lead to the deterioration of insulation and failure of the motor.Based on a belt-driven switched reluctance starter/generator(SRS/G)with segmental rotors for hybrid electric vehicles,finite-element analysis tools have been used to simulate the steady-state-thermal distribution in three working conditions,i.e.,peak power condition,rated power condition and maximum speed condition.Electromagnetic finite element software is firstly used to calculate the core and copper losses,and then these losses are added to the module of steady-state-thermal in ANSYS Workbench.Furthermore,to exactly simulate the thermal distribution,equivalent thermal conductivity factor of stator windings and convection coefficient in each surface of the motor are taken into account.Simulation results are presented in various working conditions,which lays a theoretical foundation for the safe and reliable design of the belt-driven SRS/G with segmental rotors.