真空泵用屏蔽式永磁同步电机发热严重，因此在设计阶段准确预测其温度对于真空泵系统的安全稳定运行具有重要意义。针对当前电机电磁场温度场双向耦合计算方法只能考虑温度对电机材料物理性质参数的影响，提出了一种电机电磁场温度场互相迭代计算方法。该方法不仅能够考虑温度对电机损耗和永磁体磁性能的影响，还能够考虑温度对电机部件材料导热能力和散热能力的影响，使电机电磁场和温度场预测更加符合实际情况。以一台1.5 kW屏蔽式永磁同步电机作为研究对象，基于提出的方法对电机的电磁性能和温度特性进行分析，并将分析结果与电磁热双向耦合计算结果进行了对比。此外还利用提出的互相迭代法分析了环境温度对电机温升的影响。该研究不仅可以为屏蔽式永磁同步电机优化设计提供理论依据，还可以为其运行安全性和可靠性提供参考。

The shielded permanent magnet synchronous motor for vacuum pump is seriously heated, so it is of great significance to accurately predict its temperature at the design stage for the safe and stable operation of the vacuum pump system. In view of the fact that the current two-way coupling calculation method of electromagnetic field-temperature field of motor can only consider the influence of temperature on the physical properties of motor materials, a mutual iterative calculation method of electromagnetic field-temperature field of motor is proposed. This method can not only consider the influence of temperature on the loss of motor and the magnetic properties of permanent magnet, but also consider the influence of temperature on the thermal conductivity and heat dissipation capacity of motor components, so that the prediction of electromagnetic field and temperature field of motor is more in line with the actual situation. Taking a 1.5 kW shielded permanent magnet synchronous motor as the research object, the electromagnetic performance and temperature characteristics of the motor are analyzed by using the proposed method, and the analysis results are compared with the electromagnetic thermal two-way coupling calculation results. In addition, the influence of ambient temperature on the temperature rise of the motor is studied by using the proposed mutual iteration method. This study can not only provide a theoretical basis for the optimal design of the shielded permanent magnet synchronous motor, but also provide a reference for its operational safety and reliability.

国家自然科学基金项目(61773074)