基于等效热网络法和CFD法高速永磁同步电机热计算研究  

Thermal calculation of high speed permanent magnet synchronous motor based on equivalent thermal network and CFD method

作　　者：吴胜男 郝大全 佟文明[2] WU Sheng-nan;HAO Da-quan;TONG Wen-ming(School of Electrical Engineering,Shenyang University of Technology,Shenyang,110870,China;National Engineering Research Center for Rare-earth Permanent Magnetic Machines,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学电气工程学院,辽宁沈阳110870 [2]沈阳工业大学国家稀土永磁电机工程技术研究中心,辽宁沈阳110870

出　　处：《电机与控制学报》2022年第7期29-36,共8页Electric Machines and Control

基　　金：国家自然科学基金(51907129);辽宁省科技厅项目(2021-MS-236)。

摘　　要：针对高速永磁同步电机的温度场计算准确性问题,采用等效热网络法和流固耦合的数值方法,对一台水冷非晶合金定子电机进行了热计算。建立了电机的流固耦合模型,考虑电机内空气温度分布不均匀对密度、比热容、动力粘度以及导热系数的影响。基于最小二乘法原理,得到了空气物理属性随温度变化的表达式,对电机内空气施加变温物理属性,并与恒温下电机内空气恒定物理属性的温度场计算结果和转子外表面的空气摩擦损耗计算结果进行对比分析。结果表明:对机内空气施加变温物理属性后,转子高温区域面积增加,温升计算值更接近实际,并且转子外表面空气摩擦损耗降低了4.0%。最后,搭建了样机温升实验平台进行温升实验,验证了等效热网络和流固耦合法计算结果的准确性。Aiming at accuracy of temperature field calculation of high-speed permanent magnet synchronous motor, the equivalent thermal network method and fluid structure coupling numerical method were used to calculate the thermal performance of a water-cooled amorphous alloy stator motor. The fluid structure coupling model of the motor was established, and the effects of uneven air temperature distribution in the motor on density, specific heat capacity, dynamic viscosity and thermal conductivity were considered. Based on the principle of least square method, the expression of air physical properties changing with temperature was obtained. The variable temperature physical properties were applied to the air in the motor, and compared with the temperature field calculation results of the constant temperature physical properties of the air in the motor and the air friction loss calculation results of the outer surface of the rotor. The results show that after the variable temperature physical property is applied to the air inside the machine, the area of the high temperature area of the rotor increases, the calculated value of the temperature rise is closer to the reality, and the air friction loss on the outer surface of the rotor decreases by 4.0%. Finally, the temperature rise experiment platform of the prototype was built to verify accuracy of the calculation results of the equivalent thermal network and fluid solid coupling method.

关 键 词：高速永磁同步电机 等效热网络 流固耦合 热计算 空气变温物理属性 空气摩擦损耗 

分 类 号：TM351[电气工程—电机]