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:
Jun. 15, 1999
Filed:
May. 08, 1997
Applicant:
Inventors:
Assignee:
NTN Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01B / ;
U.S. Cl.
CPC ...
415118 ; 415900 ;
Abstract
Permanent magnets are buried on one side of an impeller, and a rotor having permanent magnets buried opposite thereto is provided to form a passive bearing. On the other side of the impeller, three electromagnet coils and three position sensors are circumferentially provided at equal distances to form an active bearing, the outputs of the three position sensors are operated to produce impeller displacements, which are fed back to drive the coils.