WHAT IS AN ACTUATOR

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Actuators
An actuator is an electromechanical device which converts energy into mechanical work (or motion).  For robots, actuators are like muscles that perform work. The work can be either to induce motion, or to object motion; i.e. either to start a movement, or to stop it. There are different types of actuators available and most of them either create rotational motion, or linear motion. (Oscillatory motion is rarely used, and even if required can be created using a linear or a rotary actuator)