Analysis of Stiffness and Critical Speed of High Speed Permanent Magnet Motor Rotor System

In this paper, the stiffness analysis and critical speed calculation of the whole rotor system including the rotor and rotor shaft of high-speed permanent magnet motor are carried out. Firstly, based on analytical method and finite element method, it is verified whether the rigidity of the rotor system meets the requirements. Secondly, the finite element method is used to carry out the rotor system. The modal analysis is used to calculate the natural frequency and critical speed of the rotor. Finally, the influence of the rotor system structure on the critical speed of the rotor is analyzed.