An
actuator is a type of motor for moving or controlling a mechanism or
system. It is operated by a source of energy, typically electric
current, hydraulic fluid pressure, or pneumatic pressure, and converts
that energy into motion. An actuator is
the mechanism by which a control system acts upon an environment. The
control system can be simple (a fixed mechanical or electronic system),
software-based (e.g. a printer driver, robot control system), or a human
or other agent.
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