What is a Linear Actuator?

A linear actuator is any device that generates work by converting nonlinear energy in linear motion. There are many primary energy sources used in linear actuators, from electric motors to fluid and air pressure and thermal expansion. Each type or category of actuator is suitable for different applications according to its size, output, potential and power requirements.
These requirements include door openers, heavy-duty machine actuators and miniature precision process controllers. Machinists usually rely on pneumatic tools with actuators, including pneumatic wrenches, knives and screwdrivers.