AUTOMATIC DC OFFSET ADJUSTMENT FOR A STEPPER MOTOR CONTROLLER
Original Publication Date: 1993-Feb-28
Included in the Prior Art Database: 2004-Apr-06
Xerox Disclosure Journal
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.