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:
Jul. 10, 2001
Filed:
Nov. 15, 1999
Hiromasa Fukuyama, Kanagawa, JP;
Takeshi Takizawa, Kanagawa, JP;
NSK Ltd., Tokyo, JP;
Abstract
A magnetic bearing system includes a rotor shaft,, stationary electromagnetic pole, a radial displacement sensor,for detecting the position of the rotor shaft,with respect to the electromagnetic polarity, and a control circuit,which supplies a control current in accordance with an output from the radial displacement sensor,. A permanent magnet,is disposed in the magnetic bearing so as to constitute a portion of a magnetic member,which forms a magnetic circuit between the rotor shaft,and the electromagnetic pole. The position where a balance exists between an attraction force developed in the permanent magnet,and static force, which acts on the rotor shaft,when no load is imposed on the rotor shaft,, is set as a target position for the rotor shaft