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.
Related category TECHNOLOGY
Home • About • Copyright © The Worlds of David Darling • Encyclopedia of Alternative Energy • Contact