Stepper Motor Control
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
A technique is described whereby an IBM Personal Computer (PC), or similar microcomputers, can control up to 32 stepper motors from a single circuit card added to the computer. The concept is unique in that it enables one computer to control many automated applications which use stepper motors, while still allowing card slots in the computer to be available for other functions. This is accomplished by using the digital output (DO) portion of a digital input/digital output (DI/DO) circuit board to control the stepper motors. The implementation of the controls through the DO circuits provides the ability to generate three signals for each stepper motor - pulse, direction and mode. A square wave on the pulse signal line instructs the motor to advance one step.