"Servo" - the word derives from the Greece word for "slave". People want to treat the "servo mechanism" as a handy tame thing, and act in accordance with the requirements of the control signal. The rotor stands still until the signal comes; As soon as the signal arrives, the rotor rolls; When the signal disappears, the rotor stops on its own. Because of its "servo" function, it got its name - servo system.
1. Servo system: It is an automatic control system that enables the output of the object's orientation, orientation, and condition to change with any change in the input quantity (or given value).
2. In the automatic control system, the system that can echo the control signal with a certain accuracy is called the follow-up system, also known as the servo system.
The main task of the servo is to expand, convert and control the power according to the requirements of the control command, so that the torque, speed and azimuth output by the drive device can be controlled very flexibly and conveniently.
3. Classification and composition of servo system
According to the architecture, the servo system can be divided into open-loop servo system, closed-loop servo system, semi-closed-loop system, and composite control system. The closed-loop automatic control system with feedback is composed of a bearing detection part, an error amplification part, an execution part and a controlled object.
4. Functional requirements of servo system
It is necessary for the servo system to have the fundamental functions of good controllability, high stability and strong adaptability. To illustrate, good controllability means that after the signal disappears, it can stop on its own immediately; High stability means that the torque decreases uniformly with the addition of speed; Adaptability refers to fast response, sensitivity, and loudness
5. Varieties of servo system
It is usually classified according to the variety of servo drives, and there are three types: electrical, hydraulic or electrical-hydraulic.
If the servo system is divided according to function, there are metering servo and power servo system; analog servo and power servo systems; Azimuth servo and acceleration servo system, etc.
According to the electrical signal, the electric servo system can be divided into two categories: DC servo system and AC communication servo system. There are two kinds of AC communication servo system: asynchronous motor servo system and synchronous motor servo system.
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