等效热网络法和有限元法在轮毂电机温度场计算中的应用

轮毂电机温度场的准确计算对于轮毂电机的安全运行和性能提升至关重要。根据一般电动汽车用轮毂电机样机的结构,建立了等效热网络温度场分析模型和3D有限元模型。基于等效热网络法,编写了轮毂电机温度场计算程序,计算了额定工况下的稳态节点温度。通过有限元法,计算了轮毂电机额定工况下的稳态温度场分布和瞬态温升曲线。根据轮毂电机的温升实验,对比分析了两种方法的计算结果,验证了等效热网络分析模型和3D有限元模型的有效性,说明了等效热网络法和有限元法对于轮毂电机温度场计算的适应性和兼容性。

Application of Equivalent Thermal Network Method and Finite Element Method in Temperature Calculation of in-Wheel Motor

The accurate thermal analysis of in-wheel motor is quite important to its safety operation and performance improvement. According to the structure of in-wheel motor used in electric vehicles, the equivalent thermal network model and the 3D finite element model were established in this paper. The calculating program was written based on the equivalent thermal network method. The steady temperatures of thermal network nodes at rated operation state were calculated. Moreover, the steady temperature field distribution and the transient temperature-rising curve of in-wheel motor at rated operation state were calculated based on the finite element method. With measuring the dynamic temperature change of in-wheel motor, the calculating results were compared with the experimental data. The validity of the two models were verified. The results also show that the two methods are adaptable and compatible to calculate the temperature field of motor.