充磁导致的超高速永磁同步电机不平衡磁拉力

转子永磁体充磁角度偏差导致的不平衡磁拉力对微型燃气轮机发电系统用超高速永磁同步电机的安全稳定运行有很大的影响.采用有限元数值分析方法,分别在不考虑转子偏心和考虑转子偏心的情况下,对由充磁角度偏差导致的超高速永磁同步电机不平衡磁拉力进行了计算和分析;将不平衡磁拉力的计算结果作为载荷,获得了超高速永磁同步电机空气轴承-转子系统的固有频率及振动特性.研究结果表明:转子系统在740 Hz附近发生共振,共振幅值随着转子磁芯充磁偏差角度的增大而增大;要保证转子系统安全可靠的工作,需要将磁芯的充磁角度偏差限制在5°以内.

Unbalanced magnetic pull due to the magnetizing in super high speed permanent magnet synchronous machine

The unbalanced magnetic pull (UMP) due to the magnetizing angle deviation has a great impact on the safety and stability of the super high speed permanent magnet synchronous machine (PMSM) used in the microturbine generation system. Utilizing the numerical finite element method (FEM), the UMP due to the magnetizing angle deviation with and without the rotor eccentricity was analyzed respectively. Using the calculation results as loads, the natural frequencies and the vibration characteristics of the rotor supported by foil air bearing were obtained. The results show that the resonance frequency is near 740 Hz, and the resonance amplitude increases with the increase of the magnetizing angle deviation. To ensure the safety and reliability of the rotor system, the magnetizing angle deviation of the permanent magnet should be limited to less than 5 degrees.