Abstract: Taking the cooling channel of switched reluctance motor as the research object, an improved parallel channel was proposed on the basis of the traditional parallel flow channel, which had the advantages of low requirement for cooling system, good cooling effect and simple manufacturing process. The 3D numerical simulation model of the motor was established and a comparative investigation on the cooling performance was carried out, between traditional and improved parallel channels with variations of fluid flow rate, ambient temperature, and initial temperature of fluid under condition of the transformer oil as medium. Then, the influence of fluid medium on the temperature rise of the improved parallel channel motor was further analyzed. The researches show that: under different fluid flow rates, the heat dissipation performance of the improved parallel channel is better than that of the traditional parallel channel, and it is not easy to be affected by the environment, so it has better thermal stability; when the flow rate is 2L/min, the maximum temperature difference between the two flow channels is 5.9℃. By comparing the influence of different cooling media on the heat dissipation performance of the improved parallel channel of switched reluctance motor, the following conclusions are drawn: compared with transformer oil and ethylene glycol mixture solution, the liquid water cooling effect is the best, and among the three media, the transformer oil channel pressure difference is the smallest. The fluid flow rate has the greatest influence on the cooling effect of transformer oil and the least influence on the pressure difference of channel. When the volume concentration of ethylene glycol increases, the cooling effect of the mixed solution of ethylene glycol becomes worse and the channel pressure difference increases.

Key words: mechanical and electrical engineering, switched reluctance motor, liquid cooling, improved parallel channel, heat dissipation

摘要： 以开关磁阻电机冷却流道为研究对象，在传统并联流道基础上提出一种改进型并联流道，该流道具有对冷却系统要求低、冷却效果好、制造工艺简单的特点。通过建立电机三维数值仿真模型，以流体流量、外界环境温度、流体初始温度作为影响因素对比研究了传统并联流道与改进型并联流道在变压器油作为流体介质下的冷却性能，并进一步分析了流体介质对改进型并联流道电机温升的影响。研究表明：在不同流体流量下改进型并联流道散热性能均优于传统并联流道，且不易受环境的影响，具有更好的热稳定性；在流量为2 L/min时的2种流道下电机最高温度相差5.9 ℃。通过比较不同冷却介质对改进型并联流道开关磁阻电机散热性能的影响，得出如下结论：与变压器油、乙二醇混合液相比，液体水冷却效果最好，而这3者之中，变压器油流道压差最小；流体流量对变压器油冷却效果影响最大而对其流道压差影响最小；随着乙二醇体积浓度的升高乙二醇混合液冷却效果变差，流道压差升高。

关键词: 机电工程, 开关磁阻电机, 液冷, 改进型并联流道：散热