Patent ID: 9273723
Filing Date: 2016-03-01
CPC Classification: F16C

Claim Text:
1. A composite magnetic bearing of a radial type having an auxiliary bearing coupled around a rotor for reducing friction, comprising: a magnetic bearing including a rotor core attached to a circumference of the rotor, a plurality of stator cores arranged around the rotor core in a radial direction to form an empty space therein, a plurality of permanent magnets respectively provided to an outermost side of the stator cores, and a plurality of coils provided to the stator cores to surround the permanent magnets to place the permanent magnets at a center thereof, respectively; and an auxiliary bearing provided in the empty space, the auxiliary bearing is disposed inner side of a position the coils and the permanent magnets are provided thereto, wherein the auxiliary bearing is a rolling type bearing including a ball bearing and a roller bearing, and the auxiliary bearing is held and supported by an auxiliary bearing housing fixed and coupled to the stator cores.