In the servo system, the engine that controls the operation of mechanical components is called servo motor, which is a kind of subsidized motor indirect variable speed device that can control the speed, so that the position of the object and the orientation, state and other output controlled quantities can follow the input target (or a given value) of any change, and the position accuracy of the servo motor is very high, and it can convert the voltage signal into torque and speed to drive the control object, but how does a servo motor control work?