The closed-loop stepper motor combines the advantages of stepper motor and servo motor technology. It runs quieter and has less resonance than standard stepper motors. At the same time, it can realize position feedback and position control. It has short start-up time and vibration attenuation time, and it no longer loses step. Closed-loop stepper motors can replace standard stepper motors to meet the requirements of energy saving, quiet operation and load bearing. Compared with servo motors, closed-loop stepper motors have the following advantages: high torque can be achieved at low speeds, short start-up times, accurate positioning without subsequent swings, usually smaller sizes, and lower prices.