A servo is essentially an automatic control system whose output variable constantly changes in response to a given value. For those of us already familiar with servo cables and servo motors, understanding servo motor cables requires grasping the crucial concepts of servo and servo system .
As an automatic control system, a servo outputs control quantities including the position, orientation, and state of an object. Generally, its task is simply to amplify, transform, or adjust power according to requirements, thereby enabling more flexible control of the output of the drive device. The word "servo" actually means "slave" in Greek, indicating that servo mechanisms were originally created as tools to meet people's needs, all aimed at making their work more efficient. Therefore, servo mechanisms always perform related actions according to the requirements of the control signal. Once the control signal is lost, it will remain stationary until the control signal is transmitted again. Later, based on the characteristics of servo mechanisms, the concept of a " servo system " was derived.
A servo system , also known as a follow-up system, is a feedback control system used to precisely follow or reproduce a process. The controlled variable in a servo system, i.e., the system's output, generally refers specifically to mechanical displacement, acceleration, or velocity; it's a feedback system designed for these. Its function is to ensure that the output angle or mechanical displacement effectively and accurately tracks the input angle or mechanical displacement. Structurally, a servo system is not fundamentally different from other types of feedback control systems. Furthermore, the function of a servo system is quite clear: primarily used to control high-power loads with low-power signals, to control remote output axes from input axes without mechanical connection, and to ensure that the output mechanical displacement accurately tracks electrical signals; for example, indicating instruments function this way.
