步进电机是一种进行精确步进运动的机电执行元件，它广泛应用于工业机械的数字控制，为使系统的可靠性、通用性、可维护性以及性价比最优，根据控制系统功能要求及步进电机应用环境，确定了设计系统硬件和软件的功能划分，从而实现了基于8051单片机的四相步进电机的开环控制系统-Stepping motor is a kind of electromechanical precision stepper movement of the actuator, it is widely used in industrial machinery, digital control, in order to make the system reliability, universality, maintainability and the optimal cost, according to the functions of control system and step motor application environment, the function design of system hardware and software and so as to realize the open loop control system of 8051 single chip microcomputer four phase stepping motor based on