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:
Jan. 18, 2000
Filed:
Dec. 16, 1997
Applicant:
Inventors:
Minoru Suzuki, Shizuoka, JP;
Toshihiko Nojiri, Kanagawa, JP;
Assignee:
NTN Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04B / ; H02K / ;
U.S. Cl.
CPC ...
41742312 ; 310 905 ;
Abstract
In order to enable speedy and simple exchanging operation of impeller and casing by eliminating setting operation, a sensor output when the impeller is not floating is measured by an automatic neutral position setting circuit at the activation of an electromagnet as an active magnetic bearing, the sensor output is compared with a predetermined set value and difference therebetween is calculated, which difference is used for adjusting the sensor output.