What is the servo system _ basic requirements of the servo system _ basic components of the servo system
Servochanism, also known as servo system, is a feedback control system used to accurately follow or reproduce a process. The servo system enables an automatic control system in which the output control amount of the object, such as the position, orientation, state, etc., can follow any change in the input target (or given value). Its main task is to control the power, to transform, transform and control the power according to the requirements of the control command, so that the torque, speed and position control of the drive device are very flexible and convenient. In many cases, the servo system refers to a feedback control system in which the controlled amount (output of the system) is mechanical displacement or displacement velocity and acceleration, and its function is to make the mechanical displacement (or rotation angle) of the output accurately track the displacement of the input ( Or corners), the structural composition and other forms of feedback control systems are not in principle different. The servo system was originally used for defense military, such as the control of artillery, the automatic driving of ships, aircraft, and missile launches. Later, it was gradually extended to many departments of the national economy, such as automatic machine tools and wireless tracking control. 1. Control the high power load with a small power command signal; 2. In the absence of mechanical connection, the output shaft located at a distance is controlled by the input shaft to realize remote synchronous transmission; 3. Make the output mechanical displacement accurately track electrical signals, such as recording and indicating instruments. From the nature of the components of the system, there are electrical servo systems, hydraulic servo systems and electric-hydraulic servo systems and electrical-electrical servo systems; From the physical properties of the system output, there are speed or acceleration servo systems and position servo systems; From the characteristics of the components and signal characteristics contained in the system, there are analog servo systems and digital servo systems; From the structural characteristics of the system, there are single-return servo system, multi-feed servo system, open-loop servo system, and closed-loop servo system. The servo system is divided according to its driving components, and there are a step servo system, a DC motor (referred to as a DC motor) servo system, and an AC motor (referred to as an AC motor) servo system. (1) Good stability: Stability means that the system can reach new or return to the original equilibrium state after a short adjustment process under the given input or external disturbance. (2) High precision: The accuracy of the servo system refers to the accuracy with which the output can follow the input. As a precision machined CNC machine tool, the required positioning accuracy or contour machining accuracy is usually high, and the allowable deviation is generally between 0.01 and 0.001 mm. (3) Good responsiveness: Fast response is one of the signs of the dynamic quality of the servo system, that is, the response of the tracking command signal is required to be fast, and the transition process time is required to be short, generally within 200ms or even less than tens of milliseconds; On the other hand, in order to meet the overshoot requirement, the leading edge of the transition process is required to be steep, that is, the rate of increase is large.
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