Linear actuator

Actuator that creates motion in a straight line / From Wikipedia, the free encyclopedia

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A linear actuator is an actuator that creates motion in a straight line, in contrast to the circular motion of a conventional electric motor. Linear actuators are used in machine tools and industrial machinery, in computer peripherals such as disk drives and printers, in valves and dampers, and in many other places where linear motion is required. Hydraulic or pneumatic cylinders inherently produce linear motion. Many other mechanisms are used to generate linear motion from a rotating motor.

Conceptual design of a basic traveling-nut linear actuator. In this example the lead screw (gray) rotates while the lead nut (yellow) and tube (red) do not.
DVD drive with leadscrew and stepper motor.
Floppy disc drive with leadscrew and stepper motor.