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:
Dec. 20, 1994
Filed:
Nov. 18, 1992
Yoram Koren, Ann Arbor, MI (US);
Chih-Ching Lo, Miaoli Hsien, TW;
University of Michigan, The Board of Regents acting . . ., Ann Arbor, MI (US);
Abstract
A system for compensating for the effects of friction and other forces reting from repeatable disturbances in a servo system or a numerically controlled machine employs a software-based mathematical model which has certain parameters associated therewith. The parameters are calibrated for the specific characteristics of the system using either off-line or on-line methods, and include dynamic correction for continuous correction, as would be required to compensate for forces which disturb a desired motion. The compensation model is implemented in two stages: (i) building a calibrated mathematical model that describes a repeatable disturbance force, such as friction, and (ii) using the model in real time to compensate for the disturbance force. The model provides a compensation signal which is combined with the original controller signal to yield a compensated control signal. The compensation may be in the form of a position offset. This compensation system is general in its application and can compensate for any deterministic repeatable action that disturbs or acts against the motion of a numerically controlled, or servo, system.