Although stepper motor has been widely used, but stepper motor can not be like ordinary DC motor, AC Motor in the conventional use. It must be composed of two-ring pulse signal, power-driven circuit and other components of the control system to be used. Therefore, the use of a good stepper motor is not easy, it involves mechanical, electrical, electronic and computer and many other professional knowledge. As an actuator, stepper motor is one of the key products of electromechanical integration, which is widely used in various automatic control systems. With the development of microelectronics and computer technology, the demand of stepper motor is increasing, and it is applied in every national economy field.