The biggest difference between stepper motor and other control motors is that it receives digital control signal (electric pulse signal) and converts it into corresponding angular displacement or linear displacement. It is itself an executive element to complete digital mode conversion. The angular displacement of the stepping motor is strictly proportional to the number of input pulses, and is synchronized with the pulse in time. Therefore, as long as the number and frequency of pulses and the phase sequence of motor winding are controlled, the required angle, speed and direction can be obtained.