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:
Dec. 17, 1991
Filed:
Jul. 27, 1990
Applicant:
Inventor:
Akira Yamamura, Tokyo, JP;
Assignee:
Nippon Ferrofluidics Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310 905 ;
Abstract
The invention discloses a magnetic bearing device having a rotary main shaft, an armature disk mounted on the rotary main shaft, and a pair of bearing elements disposed on opposite sides in axial direction of the armature disk. Each of bearing elements includes a control coil provided with a pair of pole pieces, wherein a top end of each of the pole pieces is disposed near to the armature disk, and the pole pieces are mounted with a sensor coil at a position nearer to a front end side of the control coil.