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 spr...
[n] - (computer science) the actuator that moves a read/write head to the proper data track
positioner noun (computer science) the actuator that moves a read/write head to the proper data track