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, 2010
Filed:
Aug. 30, 2007
Atsushi Oyama, Tokyo, JP;
Atsushi Oyama, Tokyo, JP;
Ebara Corporation, Tokyo, JP;
Abstract
Problem of the present invention is to enable elimination or reduction of a signal wire in a dedicated cable for a magnetic bearing device for supplied an electric power from a control device to a magnetic bearing main unit via the dedicated cable. A magnetic bearing deviceaccording to the present invention has a magnetic bearing main unithaving an electromagnetM for magnetically levitating and rotatably supporting a magnetic rotating bodyand functioning as a magnetic bearing, a control devicehaving a compensating circuitfor generating a control signal for controlling a levitation position of the magnetic rotating body, and an electricity supply lineL for supplying an electric power from the control deviceto the magnetic bearing main unit. The magnetic bearing main unithas a modulation carrier circuitfor generating a modulated wave and a first alternating-current coupling sectionA for transmitting the generated modulated wave to the control deviceby the alternating-current coupling with the electricity supply lineL. The control devicehas a second alternating-current coupling sectionB for separating the modulated wave alternating-current coupled from the electricity supply lineL and a carrier wave demodulating circuitfor detecting the separated carrier signal wave.