Browse Prior Art Database

Digital Speed Control of DC Motor

IP.com Disclosure Number: IPCOM000052062D
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11

Publishing Venue

IBM

Related People

Authors:
Sjostedt, J Stalberg, N [+details]

Abstract

A circuit is provided where the motor speed is controlled by a differen amplifier having a first input from a motor tacho-generator and a second input from a digitally stepped counter. The amplifier compares and synchronizes the motor speed with the electronic frequency of the input signals to the counter. The circuit provided is preferably used to synchronize the clock rate of an optical character reader system with the document driving speed.