Analysis on the Impact Factors of Auxiliary Bearing in Vertical Magnetic Bearing

Auxiliary bearing is used to support the high-speed falling rotor in the active magnetic bearing. Its impact resistance directly affects the safety and reliability of the active magnetic bearing. In order to study the impact resistance of the auxiliary bearing in the vertical active magnetic bearing, full angular contact hybrid ceramic ball bearing was used as the auxiliary bearing, and ADAMS was used to simulate the impact force of the auxiliary bearing when the balanced rotor was fell on the auxiliary bearing. The influence of friction factor, axial protection clearance, rotor mass and rotor drop speed on the initial axial impact force of the vertical balanced rotor falling to the auxiliary bearing is analyzed. The results show that the initial axial impact force on the auxiliary bearing is the maximum axial impact force. The initial axial impact force on the protected bearing decreases with the increase of dynamic friction factor. It increases with the increase of axial protection clearance and rotor mass. Unchanged with the increase of falling speed. The influence of axial impact on the bearing can be reduced by increasing the friction factor, reducing the clearance of axial protection and the mass of rotor appropriately.