针对真空干泵驱动用电机在极端真空环境下工作时发热严重的问题，以一台4.5 kW磁通切换永磁同步电机(FSPMSM)为研究对象，分析了其冷却结构，并进行了温度场仿真计算。通过有限元软件建立FSPMSM三维温度场仿真计算模型，设定边界条件和热源激励，得到电机内部各部件的温度分布情况，并分析了水道截面直径、水道圈数对电机温度变化的影响。与一台技术要求相同的永磁同步电机(PMSM)在同等冷却条件下进行温度场对比分析，结果表明本电机设计合理。相比于真空干泵常用的传统PMSM，本电机能更好地减少损耗并降低温升，为开发真空干泵用FSPMSM新产品提供了一定的参考。

Aiming at the problem that the motor for vacuum dry pump drive is seriously heated when working in extreme vacuum environment, a 4.5 kW flux switching permanent magnet synchronous motor (FSPMSM) is taken as the research object to analyze its cooling structure, and the temperature field simulation calculation is carried out. The three-dimensional temperature field simulation calculation model of the FSPMSM is established by finite element software. The boundary conditions and heat source excitation are set to obtain the temperature distribution of each component inside the motor. The influence of the diameter of the water channel section and the number of water channel turns on the temperature change of the motor is analyzed. The temperature field comparison analysis with a permanent magnet synchronous motor (PMSM) with the same technical requirements under the same cooling conditions shows that the motor design is reasonable. Compared with the traditional PMSM commonly used in vacuum dry pump, this motor can better reduce the loss and reduce the temperature rise, which provides a certain reference for the development of new products of FSPMSM for vacuum dry pump.

辽宁省“揭榜挂帅”科技重大专项项目（2022JH1/10400038）