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ACCELEROMETER FEEDBACK FOR CLOSED-LOOP STEPPER MOTOR CONTROL

IP.com Disclosure Number: IPCOM000025252D
Original Publication Date: 1984-Apr-30
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal

Abstract

Closed loop control of stepper motors has been shown to offer superior per-formance, particularly in the accomplishment of faster settling times, and better, more accurate motion control with less overshoot. However, one drawback of most closed loop motor systems is the relatively high cost of the motion encoder that is required. In the case of drive systems for document scanners which typically have movable scanning optics or platen, the final motion sought to be achieved in systems of this kind is a linear motion which is derived from the rotary motion of the step motor. But here as well, linear motion encoders having sufficient accuracy for the closed loop control are very expensive.