actuator
AK-choo-ey-ter
/ˈæktʃueɪtər/
A component of a machine that is responsible for moving and controlling a mechanism or system (the physical 'doer').
An actuator takes an electrical control signal and converts it into physical, mechanical motion (like sliding, turning, or lifting).
The story behind the word. The word 'actuator' comes from the Latin verb 'agere', meaning 'to set in motion' or 'to do'. The past participle 'actus' gave rise to 'actuate' (to put into action) in the 17th century. By the mid-20th century, engineers adopted 'actuator' to describe the physical component that translates electrical commands into physical deeds.
Word relationships
- motor: A motor is a general device that creates rotational motion, whereas an actuator is a complete system (often including a motor and gears) designed to execute a specific, controlled physical movement.
- driver: In engineering, a driver can refer to a software component or an electronic circuit, whereas an actuator is always a physical, mechanical component.
- sensor: A sensor detects physical changes and sends data, while an actuator receives data and creates physical changes.
Commonly confused with
- sensor: A sensor is the 'eye' that gathers information, while an actuator is the 'muscle' that performs the physical action.
Word family
- actuate (verb): To cause a machine or device to operate or move.
- actuation (noun): The action of causing something to operate or the state of being operated.
Collocations
- linear actuator
- electric actuator
- hydraulic actuator
- valve actuator
Example sentences
- "The smart lock uses a tiny electric actuator to slide the heavy metal deadbolt into place when you tap your phone." Smart lock mechanism
- "Each joint of the robotic arm is powered by a high-precision actuator that allows for incredibly delicate movements." Robotics engineering
Memory hook
Think of an 'actor' on stage who performs physical 'actions'. An 'actuator' is the mechanical 'actor' that physically moves. Actuators act out the physical commands.
When not to use
Do not use 'actuator' for software-only actions. An actuator must involve physical, mechanical movement in the real world.
Fun facts
- Your smart phone contains a tiny, specialized actuator called a resonant linear actuator, which is responsible for creating the precise haptic vibrations you feel when typing.
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