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:
Apr. 28, 1981
Filed:
Mar. 12, 1979
Lee E Cannon, Bozeman, MT (US);
Daniel R Cheever, Bozeman, MT (US);
Dana Corporation, Toledo, OH (US);
Abstract
An encoder interface circuit is responsive to command direction signals and pulsed command incremental rotation signals and to actual direction signals and pulsed actual incremental rotation signals to generate an error signal to a motor driver for controlling the movement of a servo motor. A position encoder is mechanically coupled to the servo motor for generating the actual direction and incremental rotation signals. The interface circuit generates a reference pulse train and an error pulse train, both at a relatively high frequency. The error pulse train is phase modulated by adding or subtracting the pulsed actual and command incremental signals according to the state of the corresponding direction signals. The reference and phase modulated error pulse trains are then compared to generate the error signal to the motor driver.