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AUTOMATIC DC OFFSET ADJUSTMENT FOR A STEPPER MOTOR CONTROLLER

IP.com Disclosure Number: IPCOM000026636D
Original Publication Date: 1993-Feb-28
Included in the Prior Art Database: 2004-Apr-06

Publishing Venue

Xerox Disclosure Journal

Abstract

In the controller for the stepper motor of a raster input scanner, a SETPOINT SIGNAL specifies the desired current that is to be maintained in the motor phase winding. Using a closed loop current control, the motor is stepped by varying the SETPOINT in a prescribed manner. In the ensuing discussion, the SETPOINT waveforms (and thus the actual current) for the phase windings are sinusoids in quadrature.