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Actuators are types of motors that are responsible for the motion of a mechanism or in controlling a mechanism or system. It is powered by a source of energy specifically electric current, hydraulic fluid pressure or pneumatic pressure. This source of energy is converted into motion. Therefore, it can be said that when a systematic action takes place by acting on a surrounding phenomenon by a control system it is termed actuator.

The control system can be electronic system, fixed mechanical system, a human or any other type of inputs. One of such input is the electric actuators (electric motor) which is type of actuator. Examples of actuators includes: electroactive polymer, hydraulic cylinder, pneumatic actuators, thermal bimorph, electric motors (electric actuators), digital micro mirror device and screw jack.

Electric actuators are electrical machines that convert electrical energy into mechanical energy and vice versa. Electric actuators operate on three (3) different principles, namely;

· Magnetic

· Electrostic

· Piezoelectric

The most common one amongst three mentioned above is the magnetic which applies the motoring mode. In this mode there is interaction between an electric motor’s magnetic field and winding currents to generate a linear or rotary force within the electric actuators. In electronic engineering, electric actuators are subdivision of transducers. Electric actuators can be powered by direct current (DC) or alternating current (AC)

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