Patent ID: 7224094
Filing Date: 2007-05-29
Classification: B23Q,F16C,H02K

Abstract:
1. A magnetic bearing spindle comprising: a rotation shaft that is (1) fixed with a radial magnetic bearing rotor, an axial magnetic bearing rotor, and a main shaft motor rotor, and (2) held rotatably, wherein an outer peripheral portion of the axial magnetic bearing rotor is formed into a triangular shape or a shape corresponding to a triangular shape; a radial magnetic bearing stator that is disposed around the radial magnetic bearing rotor; an axial magnetic bearing stator that is disposed in an operational vicinity of the axial magnetic bearing rotor and has an axial direction positioning member, wherein an outer peripheral portion of the axial direction positioning member has a plurality of through holes; and a casing that accommodates the rotation shaft, the radial magnetic bearing stator, the axial magnetic bearing stator, and the main shaft stator and includes an air passage to pass cooling air from outside to the through holes.