Actuator
Contents |
[edit] Introduction
An actuator is a component of a machine that is responsible for moving or controlling a mechanism or system, by converting energy into motion. It is the mechanism by which a control system acts upon an environment. It can be a simple system, such as fixed or electronic, or software-based, such as robot control.
Actuators are often used in manufacturing or industrial applications, and in devices such as pumps, switches, and valves. They have also been used in innovative adaptive structures.
Motion is usually created by air, electricity, or liquid. The types of motion created by actuators are linear, rotary, or oscillatory.
The most common types of actuator are as follows:
[edit] Pneumatic
Pneumatic actuators convert energy formed by a vacuum or compressed air at high pressure into either linear or rotary motion. The advantage of this type of actuator is that has a quick response time as the power source doesn’t need to be stored in reserve. Large forces can be produced from relatively small pressure changes.
[edit] Hydraulic
Hydraulic actuators consist of a cylinder or fluid motor that uses hydraulic power to drive mechanical operation. The motion output can be linear, rotary, or oscillatory. The cylinder consists of a hollow tube along which a piston can slide. Despite having limited acceleration, a hydraulic actuator can exert considerable force as liquids are virtually impossible to compress.
Hydraulic actuators can be either single-acting – when fluid pressure is applied to one side of the piston only – or double-acting – where pressure is applied on both sides.
[edit] Electric
An electric actuator is powered by electrical energy converted by a motor. Electrical energy is used to actuate equipment such as multi-turn valves. Its advantage is that it is one of the cleanest forms of actuator as no oil is required.
[edit] Thermal or magnetic
These actuators tend to be compact, lightweight, and with high power density. They are actuated by applying thermal or magnetic energy.
[edit] Mechanical
A mechanical actuator functions by converting rotary motion into linear motion to execute movement. It involves gears, rails, pulleys, chains, and other devices to operate. An example is a rack and pinion mechanism.
NB Guide to Controls (BG 83/2023) written by John Marrow and published by BSRIA in June 2023, defines an actuator as: ‘An electromechanical device which moves the position of a valve or damper in response to a control signal.’
[edit] Other
Other types of actuator include:
- Electronically positioned actuators.
- Linear actuators.
- Power fail actuators.
- Pulsed input actuators.
- Rotary actuators.
- Spring actuators.
- Thermoelectric actuators.
[edit] External links
- https://www.bsria.com/uk/news/article/new_detailed_us_field_device_study_released/
- https://www.bsria.com/uk/news/article/growth-in-euro4-billion-european-hydronic-controls-market-led-by-rapid-uptake-of-picvs/
- https://www.bsria.com/uk/news/article/queens-building/
- https://www.bsria.com/uk/news/article/centre-for-mathematical-sciences/
[edit] Related articles on Designing Buildings
- Adaptive structures.
- Air source heat pumps.
- BSRIA announces 2021 European HVAC field device study.
- Cantilever.
- Electric motor.
- Exhaust air heat pump.
- Flange.
- Gasket.
- Institution of Mechanical Engineers.
- Key qualities of springs.
- Mechanical and electrical.
- Mechanical engineer.
- Mechanical ventilation.
- Valves.
Featured articles and news
The UK's Modern Industrial Strategy: A 10 year plan
Previous consultation criticism, current key elements and general support with some persisting reservations.
Building Safety Regulator reforms
New roles, new staff and a new fast track service pave the way for a single construction regulator.
Architectural Technologist CPDs and Communications
CIAT CPD… and how you can do it!
Cooling centres and cool spaces
Managing extreme heat in cities by directing the public to places for heat stress relief and water sources.
Winter gardens: A brief history and warm variations
Extending the season with glass in different forms and terms.
Restoring Great Yarmouth's Winter Gardens
Transforming one of the least sustainable constructions imaginable.
Construction Skills Mission Board launch sector drive
Newly formed government and industry collaboration set strategy for recruiting an additional 100,000 construction workers a year.
New Architects Code comes into effect in September 2025
ARB Architects Code of Conduct and Practice available with ongoing consultation regarding guidance.
Welsh Skills Body (Medr) launches ambitious plan
The new skills body brings together funding and regulation of tertiary education and research for the devolved nation.
Paul Gandy FCIOB announced as next CIOB President
Former Tilbury Douglas CEO takes helm.
UK Infrastructure: A 10 Year Strategy. In brief with reactions
With the National Infrastructure and Service Transformation Authority (NISTA).
Ebenezer Howard: inventor of the garden city. Book review.
The Grenfell Tower fire, eight years on
A time to pause and reflect as Dubai tower block fire reported just before anniversary.
Airtightness Topic Guide BSRIA TG 27/2025
Explaining the basics of airtightness, what it is, why it's important, when it's required and how it's carried out.
Construction contract awards hit lowest point of 2025
Plummeting for second consecutive month, intensifying concerns for housing and infrastructure goals.
Understanding Mental Health in the Built Environment 2025
Examining the state of mental health in construction, shedding light on levels of stress, anxiety and depression.
The benefits of engaging with insulation manufacturers
When considering ground floor constructions.
Lighting Industry endorses Blueprint for Electrification
The Lighting Industry Association fully supports the ECA Blueprint as a timely, urgent call to action.