This paper introduces the control system of a two-phase stepper motor composed of an Intel 80C196KC single-chip microcomputer and two PBL3717A motor driver chips, including the hardware circuit design of the motor driver based on the PBL3717A chip and the software control program of the stepper motor. The system outputs control pulses through the 80C196KC high-speed output port HSO, occupies very little CPU resources, and realizes the rotation, locking, speed control and software subdivision control of the stepper motor. Keywords: PBL3717 80C196KC stepper motor The stepper motor is a pure digital control motor that converts electrical pulse signals into angular displacement. By changing the frequency and number of output pulse signals, speed and position control can be achieved. It has good low-speed operation characteristics and a wide speed regulation range. It is simple to control, low cost, has no cumulative error, and can accurately move and position [1]. PBL3717A is a dedicated driver chip for single-phase winding of stepper motor produced by SGS-THOMSON. Two PBL3717A chips and a small number of passive circuit components can form a complete control and drive circuit for two-phase stepper motor. 80C196KC is a high-performance CHMOS 16-bit single-chip microcomputer in the INTEL MCS96 series. Using 80C196KC and PBL3717 can well realize the operation, torque subdivision, speed change and locking control of two-phase hybrid stepper motor.
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