Servo system is a system for measuring mechanical controls to meet the requirements of the position change and pre-programmed speed.

The method of control: open loop (step motor), half-closed and closed-loop (AC, DC Servo)
Servo systems including Servo motor, controller and your router.
Servo motor: The biggest difference between servo motor and a conventional engine is that it has detected the speed and location of Roto.
The controller type analog input: control the rotation speed of the rotor according to the value preset number of rounds that is proportional to voltage analog signal input (control signal).
Positioner
Locator: feedback signals of position and speed to bring to the controller