The stepper motor driver is mainly composed of a microprocessor, a power amplifier, a drive circuit and a protection circuit. The microprocessor is responsible for receiving input signals, processing control algorithms and outputting control signals; the power amplifier amplifies the control signal of the microprocessor into the drive current required by the motor; the drive circuit connects the microprocessor and the power amplifier to realize signal transmission; the protection circuit ensures the safe and stable operation of the motor under various working conditions. ‌