压缩机用内置式永磁同步电机(IPMSM)由于工作场合空间的限制，需要满足更高的功率密度要求，其温升成为亟待解决的问题。以一台7.5 kW IPMSM为例，基于计算流体力学和流固耦合传热理论，设计并分析了一种轴向通风式的冷却结构。在机壳开有通风槽、转子安装风刺并开有通风孔的情况下，研究了电机内部的流体流动特性，分析了进风口数目对流体流动的影响。得出了电机各部件温升分布规律，并比较了有无风刺以及增加进风口数目对电机散热的影响。最后制作了一台12极54槽轴向通风IPMSM，通过样机试验数据验证了此冷却结构的有效性。

Due to the space limitation of the working place, the interior permanent magnet synchronous motor(IPMSM) for compressors has higher requirements on the power density and its temperature rise has become an urgent problem to be solved. Taking a 7.5 kW IPMSM as an example, the axial ventilation cooling structure is designed and analyzed based on computational fluid dynamics(CFD) and fluid-solid coupling heat transfer theory.The fluid flow characteristics inside the motor are analyzed under the condition that the casing has ventilation slots and the rotor is installed with wafters and ventilation vents. The influence of the number of air inlets on fluid flow is studied. The temperature rise distribution of each part of the motor is obtained. The effects of wafters and number of air inlets on the heat dissipation of the motor are compared. Finally, a 12-pole 54-slot axial ventilation IPMSM is manufactured, and the effectiveness of this cooling structure is verified by the experimental data of prototype.

国家自然科学基金资助项目（51877140）