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:
May. 07, 1991
Filed:
Jul. 18, 1989
Applicant:
Inventor:
Shinji Wakui, Tokyo, JP;
Assignee:
Seiko Instruments Inc., , JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G05B / ; F16C / ;
U.S. Cl.
CPC ...
318632 ; 318621 ; 318625 ; 310 905 ; 32420712 ;
Abstract
A control device for controlling displacement of a magnetically supported moving member according to a command. A feedback circuit detects the displacement of the moving member to servo-control the same to thereby ensure stability and robustness of magnetic supporting. A feedforward circuit has an input terminal receptive of a command and an output terminal connected to the feedback circuit, and cooperates with the feedback circuit while not disturbing the stability and robustness of the magnetic suppporting for controlling the displacement of the moving member according to the command.