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:
Mar. 29, 2011
Filed:
Mar. 03, 2010
Yasusuke Iwashita, Minamitsuru-gun, JP;
Tadashi Okita, Minamitsuru-gun, JP;
Yukio Toyozawa, Minamitsuru-gun, JP;
Kazuomi Maeda, Minamitsuru-gun, JP;
Yasusuke Iwashita, Minamitsuru-gun, JP;
Tadashi Okita, Minamitsuru-gun, JP;
Yukio Toyozawa, Minamitsuru-gun, JP;
Kazuomi Maeda, Minamitsuru-gun, JP;
Fanuc Ltd, Minamitsuru-gun, Yamanashi, JP;
Abstract
A servo control apparatus that performs dual-position feedback control and thereby achieves a reduction in position error according to the purpose of machining. The servo control apparatus includes: a first position detector for detecting the position of a motor; a second position detector for detecting the position of a driven load; a first position error calculator for calculating a first position error based on a position command and motor position feedback; a second position error calculator for calculating a second position error based on the position command and driven load position feedback; a third position error calculator for calculating a third position error to be used for position control, by adding to the first position error a difference taken between the first position error and the second position error and passed through a time constant circuit; a selector for selecting either the second position error or the third position error for output; and a learning controller for learning an output of the selector, and for outputting an amount of compensation to be applied to the third position error.