新能源汽车的需求使得永磁同步电机( PMSM)向高功率密度方向发展，温升成为其中的一个关键问题，因此对散热系统的研究显得尤为重要。以一台额定功率30 kW的强制液冷PMSM为例，通过正交试验法，结合仿真软件的数值模拟，对电机散热系统性能及其影响因素进行研究。根据相关文献和工程经验，确定电机壳体材料、冷却管道结构、冷却介质和管道数目是影响电机散热效果的主要因素。通过对仿真试验结果的极差分析。确定电机散热性能影响因素的主次顺序，得出冷却介质对最高温度影响最大，冷却结构是对管道压降影响最显著的因素。最后从由结果分析给出了较好的方案组合。%The demand for clean-energy vehicles made permanent magnet synchronous motor ( PMSM) develop in the direction of high power density and the study of the cooling system was particularly important for the temperature rise was one of the key problems. A 30 kW forced liquid-cooled PMSM was set as an example. By orthogonal experiment and numerical simulation software, the motor cooling system properties and its influence factors were studied. According to the relevant literature and engineering experience, the housing materials, the cooling structure, the cooling medium and the number of pipelines were determined as the main factors affecting the motor cooling effect. The primary and secondary order of these factors were determined by the range analysis of the simulation results and it showed that the cooling medium and the cooling structure were, respectively, the most significant factor of the temperature rise and pressure drop. Simultaneously the results of the analysis also gave a better combination.
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