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:
Oct. 28, 2003
Filed:
Mar. 04, 2002
Akira Shimoyama, Numazu, JP;
Kokusan Denki Co., Ltd., Shizuoka-ken, JP;
Abstract
A method of controlling a DC servomotor for driving a driven member coupled by a wire to an operation member of a valve, wherein, at the start of a control, the motor is driven first to rotate the operation shaft of the valve to a limit position after the motor stops, a driving current of the motor is gradually reduced to return slowly the driven member by a tension of the wire, and a position of the driven member when the driving current of the motor becomes zero is stored as a final stop position, thereafter, a rotational range of the driven member is limited to the range between these final stop positions when the position of the driven member is controlled to coincide with a target position.