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What is an actuator?

What is an actuator? Here are some definitions.

Noun
  1. Something that actuates something else, especially a usually electric device that causes a mechanical device (i.e. a mechanism) to be switched on or off, for example an electric motor that opens and closes a valve
  2. (computing) The mechanism that moves the head assembly on a disk drive
  3. (electrical) A relay that controls the flow of electricity
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Separation of the speed trim actuator from the swash plate would result in the loss of longitudinal cyclic control of the aft rotor head.
This means that when the actuator moves, all of the heads move together in a synchronized fashion.
The housing is made of metal, and the actuator head is made of glass-fiber-reinforced, noncombustible plastic or metal.
If that actuator starts to move unexpectedly, it acts as a generator and the short provides an electrical load that slows the motor down.
The device was integrated with a 6 mm ratchet wheel and rotary solenoid actuator.
The Army conducted extensive testing of the trailer, with a modified brake actuator mechanism and strengthened trailer chassis and tow bar.

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