Patent ID: 7315101

Claim:
A magnetic bearing apparatus comprising: a rotatable rotary shaft to which a radial magnetic bearing rotor and an axial magnetic bearing disc are secured; electromagnets which are arranged with forming a small gap with respect to said radial magnetic bearing rotor and said axial magnetic bearing disc; and a case housing them, wherein said apparatus further comprises: cooling wind producing means that produces cooling wind of a low temperature, and that has: fins which are disposed on said axial magnetic bearing disc, and which produces an air flow directed in an outer radial direction of said axial magnetic bearing disc; a supply port which is positioned in an outer circumferential portion of said fins, and through which the air flow produced by said fins is introduced and ejected as a high-speed air flow in the outer radial direction; a generator which converts the high-speed air flow ejected from said supply port, to a vortex flow; an air flow path through which the high-speed vortex flow produced by said generator is to flow; and a control valve which is disposed on a side of said air flow path opposite to said generator; and a cooling wind flow path through which the low-temperature cooling wind produced by said cooling wind producing means is to flow into said magnetic bearing apparatus.