The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 2007
Filed:
Jul. 12, 2002
Akihiro Shimada, Tokyo, JP;
Akihiro Shimada, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A magnetic bearing spindle includes a radial magnetic bearing rotor fabricated by laminating a ring-like plate made of electromagnetic steel sheet, an axial magnetic bearing rotor made of magnetic material, and a main shaft motor rotor. A rotation shaft is fit rotatably in these rotors and a plurality of electromagnets are disposed around the rotation shaft. A bracket is provided with a cooling air supply port, and an air passage is provided in a frame. An outer peripheral portion of the axial magnetic bearing rotor is provided with a triangular portion. An outer peripheral portion of an axial direction positioning collar of an axial magnetic bearing stator is provided with through holes. Cooling air is supplied from the through holes.