真空泵用反凸极永磁同步电机设计与性能分析

Design and Performance Analysis of Negative Salient Pole Permanent Magnet Synchronous Motor for Vacuum Pump

针对真空泵用驱动电机运行过程中存在转子温度高、散热难的问题,根据真空泵驱动工况的实际要求,设计了一台反凸极永磁同步电机和一台常规永磁同步电机。首先,利用有限元软件,分析了转子磁障尺寸对电机转矩的影响以及磁障层数对电感的影响,从而得出了转子磁障尺寸和磁障层数的合适值;其次,对两台电机的气隙磁密波形、空载反电动势和损耗等电磁性能进行了对比分析;最后,通过仿真对比分析了两台电机的温度场以及两者转子和转轴处的温升。结果表明,相比于常规永磁同步电机,反凸极永磁同步电机的转矩性能更好、转子损耗和转子温升更小,为新产品研发提供了科学的参考依据。

Aiming at the problems of high rotor temperature and difficult heat dissipation during the operation of the drive motor for vacuum pump,a negative salient pole permanent magnet synchronous motor and a conventional permanent magnet synchronous motor are designed according to the actual requirements of the driving conditions of vacuum pump.Firstly,the impact of the size of the rotor magnetic barrier on the motor torque and the impact of the number of magnetic barrier layers on the inductance are analyzed using finite element software,so the suitable values of the rotor magnetic barrier size and the number of magnetic barrier layers are obtained.Secondly,the electromagnetic performances of the two motors,such as the air gap magnetic density waveforms,no-load back electromotive force and losses are comparatively analyzed.Finally,the temperature fields of the two motors as well as the temperature rises at the rotors and shafts of the two motors are analyzed by simulation comparison.The results show that compared with the conventional permanent magnet synchronous motor,the negative salient pole permanent magnet synchronous motor has better torque performance,smaller rotor loss and rotor temperature rise,which provides a scientific reference for the development of new products.