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rotary actuator
A rotary actuator is an actuator that produces a rotary motion or torque.
The simplest actuator is purely mechanical, where linear motion in one direction gives rise to rotation. The most common actuators though are electrically powered. Other actuators may be powered by pneumatic or hydraulic power, or may use energy stored internally through springs.
The motion produced by an actuator may be either continuous rotation, as for an electric motor, or movement to a fixed angular position as for servomotors and stepper motors. A further form, the torque motor, does not necessarily produce any rotation but merely generates a precise torque which then either causes rotation, or is balanced by some opposing torque.
== Actuator power sources ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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