What bearings are there on the three-phase asynchronous motor? What are their respective roles?

Bearings of three-phase asynchronous motors are generally divided into three types: one is to bear radial force: deep groove radial ball bearings; Radial cylindrical bearing; (309, NU3 19, etc. ) a kind of radial and axial force: centripetal thrust ball bearing, (73 19, etc. ) and another bearing axial force: thrust ball bearing (5 1222, etc. ) has a clear function and plays a role no matter what force is exerted.