真空泵用定子永磁型与转子永磁型电机热性能对比

Comparison of Thermal Performance of Stator Permanent Magnet Motor andRotor Permanent Magnet Motor for Vacuum Pumps

针对真空泵用驱动电机在额定运行过程中转子热膨胀积累导致轴承抱死的工程问题,根据实际真空泵驱动工况要求,设计了1台磁通切换永磁同步电机(FSPMSM)。利用有限元软件,分析对比了具有相同技术要求的FSPMSM,表贴式永磁同步电机(SPMSM)和内置式永磁同步电机(IPMSM)的电磁场、温度场及热应力场。综合分析了上述3种电机的性能差异,研究表明:FSPMSM的转子温升、轴承热形变等均优于2台转子永磁型电机。验证了FSPMSM相比于传统转子永磁型电机能更好地减小运行时的转子损耗与温升,为永磁电机拓扑结构的选择和新产品研发提供了科学的参考依据。

The drive motor for the vacuum pump has the engineering problem of the accumulation of thermal expansion of the rotor during the rated operation.According to the actual driving conditions of the vacuum pump,a flux switching stator permanent magnet synchronous motor(FSPMSM)is designed.The electromagnetic field,the temperature field and the thermal stress field of FSPMSM,surface permanent magnet synchronous motor(SPMSM)and interior permanent magnet synchronous motor(IPMSM)with the same technical requirements are compared and analyzed using finite element software.Comprehensive analysis of the performance differences of the three types of motors shows that the temperature rise and the thermal deformation of the FSPMSM are better than the rotor permanent magnet motor.It is verified that FSPMSM can better reduce the rotor loss and temperature rise during operation compared with the traditional rotor permanent magnet motor,which provides a scientific reference for the choice of topology of permanent magnet motor and the development of new products.