Electric motor having a spherical bearing

摘要

An electric motor includes a stator frame carrying a coil, and a rotor bushing carrying a magnet. The coil rotates the rotor bushing relative to the stator housing about a vertical axis. The stator frame and rotor bushing together form a cavity in which a spherical bearing is disposed. The rotor bushing includes a contact member engaging an upper portio of the spherical bearing with a point contact, to transfer the weight of the rotor bushing to the spherical bearing. The axis passes through the cavity and the spherical bearing. An outer cylindrical surface of the rotor bushing faces a cylindrical inner surface of the cavity and has grooves formed therein for drawing-in air.