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:
Aug. 25, 1998
Filed:
Jan. 16, 1997
Applicant:
Inventors:
Tsugito Nakazeki, Shizuoka, JP;
Toshihiko Nojiri, Kanagawa, JP;
Assignee:
NTN Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
73 5428 ; 73 5435 ; 73 5423 ;
Abstract
A rotor is magnetically suspended in liquid by a non-active magnetic bearing with opposed permanent magnets, a step shaped signal at constant voltage is generated from a signal generator, and supplied to an electromagnet of an active magnetic bearing, the response of the rotor at the time is detected by a position sensor, and viscosity equivalent to an damping coefficient is calculated by a CPU.