本设计选用第三种方案，用PMM8713三相或四相步进电机的脉冲分配器、SI-7300A两相或四相功率驱动器，组成四相步进电机功率驱动电路，以提高集成度和-The third program of this design choice, and PMM8713 or three-phase four-phase stepper motor pulse distributor, SI-7300A Two-phase or four-phase drive power to form a four-phase stepper motor driver circuit power to improve the integration and