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:
Feb. 01, 2000
Filed:
Oct. 19, 1998
Applicant:
Inventor:
Takaji Yasui, Nagano, JP;
Assignee:
Tamagawa Seiki Kabushiki Kaisha, Nagano-ken, JP;
Primary Examiner:
Int. Cl.
CPC ...
G05B / ;
U.S. Cl.
CPC ...
318561 ; 318569 ; 318600 ; 318615 ;
Abstract
A conventional method for driving a servo-motor is carried out by means of a current feedback loop, using a current sensor and an A/D converter. In this conventional set-up, the number of parts was great, cost reduction was difficult and it was difficult to avoid control errors caused by errors in the precision of the current sensor. A method for driving a servo-motor of the present invention comprises freely setting the current control response of a servo-motor (4) by changing the time-constant .tau. using a calculation system Ra+Las, which is opposite with respect to the calculation system of the servo-motor (4), and a primary delay element 1/1+.tau.s.