What is a servo?
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There is a servo on the electric actuator. I would like to ask whether it is used to amplify signals or for feedback purposes. I hope experienced users can explain its working principle as well as other applications in which it might be used; I’m eager to learn more about it
It’s actually just a signal amplifier
The servo amplifier is a supporting device for electric actuators, and it is one of the essential core components in automatic control systems. Working in conjunction with electric actuators, it receives control signals from instruments such as regulators, industrial computers, DCS systems, and computers, and uses these signals to operate the electric actuators to carry out adjustment tasks. It is widely used in industries such as power generation, chemicals, petroleum, metallurgy, and light industry. Products from different manufacturers, with various nameplates and series codes, have similar internal structures and working principles, and their terminal definitions are exactly the same (meaning that they can be used interchangeably across different brands). http://www.eefocus.com/html/08-12/4996325101243CcON.shtml The article provides quite detailed information, mainly focusing on various issues related to electronic circuits. These days, electric actuators are all electronic in nature, more intelligent, and integrated; servo amplifiers are no longer used. This post was last edited by chmyh on 2009-3-3 11:31]
Servo mechanism A servo mechanism is a type of servo system in which the quantity being controlled is the mechanical position or the derivative of the mechanical position with respect to time. A servomechanism is a system that achieves control over the position, speed, or acceleration of a mechanical system through closed-loop control. History of Development Servomechanism theory originated during World War II, when the U.S. military, in order to develop radar tracking systems with automatic control capabilities, commissioned MIT to work on closed-loop control techniques for control mechanical systems, thereby improving the accuracy of guided weapons such as cruise missiles. This development laid the foundation for subsequent theories related to servomechanisms. The continuous advancement of microprocessors and integrated circuits has not only driven the development of the information industry but also indirectly contributed to the progress of servo drive technology. Structure A servo system typically consists of several components, including the plant, actuator, sensor, and controller. A controlled system refers to the object that is being controlled, such as a robotic arm or a mechanical work platform. The function of an actuator is to provide power to the controlled object, and it can be driven by air pressure, hydraulic pressure, or electricity; if hydraulic pressure is used for driving, it is a hydraulic servo system. At present, the vast majority of servo systems use electric drive mechanisms; the actuator consists of a motor and a power amplifier. Motors that are specifically designed for use in servo systems are called servo motors, and such motors include position feedback devices such as optical encoders or resolvers. A traditional servo mechanism system consists of a servo drive, which mainly includes a power amplifier and a servo controller. Taking a servo motor as an example, its servo controller usually includes a speed controller and a torque controller. The motor typically provides an analog speed feedback signal, and the control interface uses ±10V analog signals; through analog commands from an external circuit, it is possible to directly control the motor’s speed or torque. With this type of servo driver, a position controller usually has to be added as well in order to achieve position control. Servo motors currently used in the industrial sector include DC servo motors, permanent magnet AC servo motors, and induction AC servo motors, among which permanent magnet AC servo motors account for the vast majority. The function of the controller is to provide closed-loop control for the entire servo system, such as torque control, speed control, and position control. Currently, general industrial servo drives typically consist of a controller and a power amplifier. The servo driver includes a servo controller and a power amplifier, while the servo motor provides resolution feedback signals from a photoelectric encoder. For reference only!
Positioning, closed-loop control. It’s the one with a feedback signal
So what is the principle behind a servo level gauge?