There are two definitions of servo systems. (1) Servo is an automatic control system that enables the output of the position, orientation, and state of the object to change with any change in the input amount (or given value). (2) In the automatic control system, the system that can respond to the control signal with a certain accuracy is collectively referred to as the servo system, also known as the servo system. In fact, from the definition of servo system, we can understand it as an automatic control system. Now the development of many mechanical equipment is toward automation, intelligent development, so today there are many mechanical equipment will be applied to the servo system, such as magnetic core servo forming machine.