The servo motor can control the speed and position accuracy. The servo motor can convert the voltage signal into torque and speed to drive the control object. The rotor speed of the servo motor is controlled by the input signal and can respond quickly. In the automatic control system, it is used as an actuator. The resulting electrical signal is converted into an angular displacement or angular velocity output on the motor shaft. Divided into DC and AC servo motors, the main feature is that when the signal voltage is zero, there is no rotation, and the speed decreases uniformly with the increase of torque.