中文摘要：

短时工作制高功率密度永磁电机具有工作电密高、电枢绕组发热大、温升高的特点。对电机的三维温度场计算尤其是绕组端部温升的准确计算成为高功率密度电机设计的重要部分。该文对高功率密度电机的损耗进行了准确计算,着重分析端部绕组的电阻和铜损耗。在电机的三维温度场计算模型中对端部绕组进行了分层等效,计算和实验结果表明分层等效模型能够提高绕组温升计算的准确性。为降低高功率密度电机中电枢绕组的温升水平,对电机端部绕组进行导热优化,减小了端部绕组的传热热阻,电枢绕组的最高温升从80℃降至69℃。最后通过样机实验验证了理论计算的正确性。

英文摘要：

The short-time duty permanent magnet motor with high power density has the characteristics of high current density and high temperature rise of armature winding. The accurate calculation of the 3D temperature field is huge important to the design of high power density motor. Firstly, the loss of high power density motor was calculated carefully, and the resistance and copper loss of end winding were also analyzed especially. Secondly, in the calculation model of the 3D temperature field, a layered equivalent model of the armature-winding end was defined and the experimental results show that the layered equivalent model can improve the accuracy of the winding temperature calculation. Thirdly, in order to reduce the winding-temperature rise of high power density motor, we chose a technique for optimizing the heat conduction of the winding end, which can reduce the thermal resistance between the winding end and the housing. Then the highest temperature of winding dropped from 80 degrees to 69 degrees on the Celsius scale. Finally, the correctness of the theoretical calculation is verified by the prototype experiments.