ZLTECH closed-loop stepper driver 2S86 controls DSP chip and closed-loop control technology, so as to completely overcome the problem of step loss of open-loop stepper motor. Under light load, it can significantly improve the high-speed performance of the motor, reduce the heating degree of the motor and reduce the vibration of the motor, so as to improve the processing speed and accuracy of the machine and reduce the energy consumption of the machine. In addition, when the motor is continuously overloaded, the driver will output an alarm signal, which has the same reliability as the AC servo system.