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A servomechanism, usually shortened to just servo, is a device used to provide mechanical control at a distance. For example, a servo can be used at a remote location to proportionally follow the angular position of a control knob. The connection between the two is not mechanical, but electrical or wireless, for example.

The most common type of servo is that mentioned, which gives positional control. Servos are commonly electrical or partially electronic in nature, using an electric motor as the primary means of creating mechanical force, though other types that use hydraulics, pneumatics or magnetic principles are available. Usually, servos operate on the principle of negative feedback, where the control input is compared to the actual position of the mechanical system as measured by some sort of transducer at the output. Any difference between the actual and wanted values (an "error signal") is amplified and used to drive the system in the direction necessary to reduce or eliminate the error. A whole science of this type of system has been developed, known as control theory.

Servos are found in many applications. They operate the throttle of engines that use a cruise control. CNC machines use servos to make the motion axes of a machine tool follow the desired tool path. Fly-by-wire systems in aircraft use servos to actuate the control surfaces that control the aircraft. Radio-controlled airplanes use servos for the same purpose. Many autofocus cameras also use a servomechanism to accurately move the focus.

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Related Questions

Difference between servo valve proportional valve?

What is the difference between servo valves and proportional valvesThere are no strict rules between Servo valves and proportional valves, because the proportional valve"s performance is getting better, gradually close to the servo valve, so in recent years there has been proportional servo valve. The difference between servo and proportional valve can be divided into the following points: 1. Drive different.2. Different performance parameters.3. Different valve structure and precision.4. Function in different types.5. Valve rated pressure drop are different.So people can choose the different kinds of valves on the basic of you require.Angad kumar pandey


What is the difference between solenoid valve and control valve?

I believe that servo is motorized and solenoid is magnetically activated.


What is the definition of a servo pressure regulators?

it is a regulator of servoing and pressure control to oversee the valve


How does servo valve works?

A Servo Valves is a device that meters the flow of oil in response to an electrical input signal or command to control position, velocity, pressure or force in some type of machine or device (usually through a piston or cylinder).


Can drum brakes be servo or non servo?

They are either servo type or non servo type, they can't be both types.


What is a Micro Servo?

A micro servo is a small servo. The term can be used to describe any servo that is smaller than a "typical" servo. For example a servo that is about 1.5" x 1.5" x 0.5" would probably be called a micro servo. Most servos use the same signals and voltages, so usually a micro servo can be plugged into any servo controller or radio receiver that a regular servo can be plugged into.


What is brake servo?

A brake servo is a servo that is used for brakes That's all folks


What is the birth name of Piero Servo?

Piero Servo's birth name is Servo, Giampiero.


What does the Finnish word servo mean?

Servo in Finnish is a loan-word from the English word servomechanism or servo.


What the different between the servo brake and non-servo brake?

why are air brakes considered non-servo


How do servo motors alter the RPM?

servo motors change their rpm as instructed servo motors recieve instructions from a controller to do some action servo motors generally have feedback so the controller can see where they need to go servo motors can be electric air or hydrolic powered an example: cars have a cruse control you set a desired speed of travel the vacuum powered servo motor controls the throttle of the gas engine the transmission controls the ratio of gearing so the engine is not overloaded at some point when conditions are satisified you will get the correct speed ... if you go over the desired speed the vacuum powered servo motor backs off which eventually controls the differential driving rpm of the rear wheels here again the servo motor can be considered to be the valve on the vacuum bladder or the entire drive train


What is dual brake servo?

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