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. 19, 2012
Filed:
Feb. 07, 2008
Gen Kuwata, Tokyo, JP;
Gen Kuwata, Tokyo, JP;
IHI Corporation, Tokyo, JP;
Abstract
An electromagnetic attraction type magnetic bearing includes at least a pair of electromagnets () arranged to face each other, a float () arranged between the electromagnets and held at the middle position thereof, a sensor () for detecting the displacement of the float () from a balance position, and/or the speed thereof, and a controller () for controlling the electromagnets (). The controller () determines a variable Z proportional to acceleration in the control direction from the displacement and speed of the float (), and operates to set the control current of one of the electromagnets to zero and to control only the control current of the other of the electromagnets, depending on the positive and negative values of the variable.