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A servomechanism, or
servo is an automatic device which uses
... A common type of
servo provides position control.
Servos are commonly electrical or
...en.wikipedia.orgSpecializing in Hitec and Futaba
servos, radio systems, and related electronics.
www.servocity.comWe offer four different gear materials in our Hitec line of
servos. Nylon is the base and is great for standard applications and offers excellent wear
...www.servocity.comServos are extremely useful in robotics. The motors are small, as you can see
... So, how does a
servo work? The
servo motor has some control circuits and a
...www.seattlerobotics.org
There are several types of
servo motors but I'll just deal with a simple DC type here.
... RC
servos normally have 3 wires: +v, ground, control.
...www.arrickrobotics.comServos are extremely popular with robot, RC plane, and RC boat builders.
... Since
servos contain DC motors, please read my DC motor tutorial to learn about
...www.societyofrobots.com
A giant cross reference of
servos used in radio control modelling.
www.fatlion.comRobot
Servos · S3003
Servo Ball Bearing Conversion Kit · SR10 Dual
Servo Reverser ·
Servo Gear Sets ·
Servo Case Sets ·
Servo Horns
...www.futaba-rc.com
Wikipedia
Servomechanism
From Wikipedia, the free encyclopedia
(Redirected from Servos)
It has been suggested that Servo drive be merged into this article or section. (Discuss)
For other uses, see servo.
Industrial servomotor
The grey/green cylinder is the brush-type DC motor. The black section at the bottom contains the planetary reduction gear, and the black object atop the motor is the optical encoder for position feedback. This is the steering actuator of a large robot vehicle.
A servomechanism, or servo is an automatic device which uses error-sensing feedback to correct the performance of a mechanism. The term correctly applies only to systems where the feedback or error-correction signals help control mechanical position or other parameters. For example an automotive power window control is not a servomechanism, as there is no automatic feedback which controls position—the operator does this by observation. By contrast the car's cruise control uses closed loop feedback, which classifies it as a servomechanism.
Servomechanisms may or may not use a servomotor. For example a household furnace controlled by thermostat is a servomechanism, yet there is no closed-loop control of a servomotor.
A common type of servo provides position control. Servos are commonly electrical or partially electronic in nature, using an electric motor as the primary means of creating mechanical force. Other types of servos use hydraulics, pneumatics, or magnetic principles. 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. An entire science known as control theory has been developed on this type of system.
Servomechanisms were first used in military fire-control and marine navigation equipment. Today servomechanisms are used in automatic machine tools, satellite-tracking antennas, automatic navigation systems on boats and planes, and antiaircraft-gun control systems. Other examples are fly-by-wire systems in aircraft which use servos to actuate the aircraft's control surfaces, and radio-controlled models which use RC servos for the same purpose. Many autofocus cameras also use a servomechanism to accurately move the lens, and thus adjust the focus. A modern hard disk drive has a magnetic servo system with sub-micrometre positioning accuracy.
Typical servos give a rotary (angular) output. Linear types are common as well, using a screw thread or a linear motor to give linear motion.
Another device commonly referred to as a servo is used in automobiles to amplify the steering or braking force applied by the driver. However, these devices are not true servos, but rather mechanical amplifiers. (See also Power steering or Vacuum servo.)
In industrial machines, servos are used to perform complex motion.
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