There are many structural forms and classification methods of stepping motors, which are generally divided into three types according to excitation mode: reluctance type, permanent magnet type and mixed magnet type; According to the number of phases, it can be divided into single-phase, two-phase, three-phase and multi-equivalent forms. The starting frequency characteristic of the stepping motor makes it impossible to reach the operating frequency directly when the stepping motor starts, but there should be a starting process, that is, gradually increasing the speed from a low speed to the operating speed.

Stepping motor is a kind of motor that converts electric pulse signal into corresponding angular displacement or linear displacement. Each time a pulse signal is input, the rotor will turn an angle or move forward. Its output angular displacement or linear displacement is proportional to the number of input pulses, and the speed is proportional to the pulse frequency. Therefore, stepping motor is also called pulse motor.