基于12/8磁阻电机极性分布对电机损耗及温度场的影响

Influence of Polarity Distribution on Motor Loss andTemperature Field Based on 12/8 Reluctance Motor

开关磁阻电机(switched reluctance motor,SRM)结构简单、坚固和转子上无永磁体与绕组,具有体积小、功率低和轴向利用率高的优点,可用于电动汽车驱动领域。而紧凑的结构绕组散热面积小和热负荷高,使得准确计算电机的损耗与温升变得十分重要。以12/8 SRM电机为例,推导电机各部分铁损模型,分析不同接线方式下电机磁极分布对电机铁损以及温升的影响。通过有限元计算电机的铁损验证模型计算结果,利用磁-热单向耦合方法对SRM进行温度场分析,分析电机各主要部件的分布规律,为SRM的温度预估以及散热提供依据。

Switched reluctance motor(SRM)has the advantages of simple and strong structure,no permanent magnet and winding on the rotor,small size,low power and high axial utilization,which can be used in the field of electric vehicle drive.However,its compact structure has small heat dissipation area and high thermal load,so it is very important to accurately calculate the loss and temperature rise of the motor.Taking 12/8 SRM motor as an example,the core loss model of each part of the motor was deduced,and the influence of different motor pole distribution on core loss and temperature rise of the motor under different connection modes was analyzed.Using the finite element method,the core loss verification model of the motor was calculated;the temperature field of SRM was analyzed by using the magnetic thermal unidirectional coupling method,and the distribution law of the main parts of the motor was found out,which provides the basis for the temperature prediction and heat dissipation measures of the SRM.