Taking a rated power of 60 kW PMSM as the research object, the air gap equivalent thermal conductivity coefficient was used to deal with the heat exchange between the stator and rotor. The equivalent thermal model of the stator windings was given. Considering temperature effect on stator winding resistance in winding copper loss calculation, the thermal resistance between the housing and the stator core due to the assembly gap was test. On this basis, the finite element model of 3D global transient temperature field of PMSM was established, and the temperature field of motor at peak speed was calculated and verified by experiment. The optimization of channel width ratio, channel number and fin was carried out to find out the optimal solution. The results showed that the maximum temperature of the motor was decreased by 9.8 C after the channel was optimized, which had a certain guiding significance for the structural design of the motor channel.%以额定功率为60 kW永磁同步电机(PMSM)为研究对象,采用气隙等效导热系数处理定转子间的热交换问题.给出散下线定子绕组的等效热模型.在进行绕组铜耗计算时考虑温升对定子绕组阻值的影响,试验测定壳体与定子铁心间因装配间隙而产生的热阻值.在此基础上建立PMSM三维全域瞬态温度场有限元模型,计算电机在峰值转速运行时的温度场变化,并进行试验验证.对水道宽度比、水道数和翅片进行优化计算,找出最优解.结果表明,水道优化后电机最高温度下降9.8 ℃,对电机水道结构设计具有一定的指导意义.
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