Performance Analysis of Auxiliary Bearing Based on Four-contact-point Ball Bearing

The performance of auxiliary bearings based on fourcontact- point ball bearings is studied. Firstly, based on Hertz contact theory, the static model of bearing is established to analyse the influence of structural parameters on stress and strain of the contact part, and the selection range of the optimal parameters is given. Then, the mechanical analysis of fourcontact- point ball bearing under different loads is carried out, and the variation law of load distribution is studied by theoretical calculation. Finally, the dynamic model of rotor dropping is established to compare the protection effect between four-contact-point ball bearing and angular contact bearing. A test rig is built to carry out the rotor drop experiment under different bearing protection. The results could be referenced for the design of auxiliary bearings in active magnetic bearing system.