| The advantages of stepping motor are regulating-rate, quickly rise-stop, positive- reverse controlling and brake etc by changing the frequency of pulse. The stepping motor opening-ring system is simple, cheap, stable and reliable, therefore its application is very extensive in many realm.Only when it is connected to a special equipment—stepping motor driver, stepping motors can work properly. Microstep have to be considered when smaller step angle, better resolving ability is needed or to solve the problem of vibrancy, noise and so on. Microstep technique can make the step-angle smaller, improve the resolving ability and solve the problem of vibrancy, noise. As a result, it makes stepping motor more suitable to be used in advanced control system.The thesis develops a SCM-based subdivided control system for two-phase hybrid stepping motor. This system is mainly constructed from an AT89C2051 SCM which is used as the core of control parts and a full-bridge driver L6203 which is used as driving parts. Combined with other circuits and apparatus, the system fulfills the subdivided control of two-phase hybrid stepping motor.As the development of power electronics, the function of single chip computer becomes more powerful and the price becomes cheaper. The thesis analyses the theory of two-phase hybrid stepping motor and sets up its mathematics model. Through the chopper with constant frequency PWM and constant current combined with variable subdivision, by means of PWM control to the phrase winding current in order to adjust its amplitude and direction in the principle of ladder sinusoid form, we can fractionize the step-angle to Microstep.The driver controller is composed of two parts, the subdivision part is realized by hardware, and another part is control idea which is realized by SCM and software. In addition, the driver controller is put into experiment research and the result shows that the driver controller could fulfill the control task of two-phase hybrid stepping motor greatly.
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