Stepper motor is a kind of motor dedicated to controlling precision displacement and large-scale speed regulation. Its rotation is operated step by step according to its inherent step angle (determined by the mechanical structure of the rotor and stator). It is characterized by each rotation. In one step, the step angle is always the same, maintaining a precise and accurate position. So no matter how many times of rotation, there is no accumulation error. Because of the simple control method and low cost, it is widely used in various open loop control.

       The operation of the stepper motor requires a power-type electronic device with pulse distribution, which is the stepper motor driver. It receives the pulse signal from the control system, distributes the pulses in sequence according to the structural characteristics of the stepper motor, and realizes the control angular displacement, rotational speed, rotation direction, brake loading state, and free state. Each time the control system sends a pulse signal, the stepper motor can be driven to rotate by one step angle. The speed of the stepper motor is proportional to the frequency of the pulse signal. The angular displacement is related to the number of pulses. When the stepper motor stops rotating, it can produce two states: the brake load can generate the maximum or partial holding torque (commonly called brake hold, no electromagnetic brake or mechanical brake) and the rotor is in a free state (can be externally thrusted) Drives easy rotation).

       The stepper motor driver must match the model of the stepper motor. Otherwise, the stepper motor and driver will be damaged.