A

David

Darling

servomechanism

A servomechanism is an automatic control device which controls the position, velocity, or acceleration of a high-power output device by means of a command signal from a low-power reference device. By feedback, the error between the actual output state and the state commanded is measured, amplified and made to drive a servomotor which corrects the output. The drive may be electrical, hydraulic, or pneumatic. See also actuator.