What is the primary function of an actuator in a control system?

The primary function of an actuator in a control system is to convert control signals into physical action. Actuators play a crucial role in executing the decisions made by the control system by physically responding to the control signals they receive. This may involve moving mechanical components, adjusting valves, or activating motors, which allows the control system to implement changes necessary for regulating processes or maintaining system stability.

In a control system, the actuator acts as the interface between the control signals generated by the controller and the actual physical changes required in the process. This conversion is vital for the efficacy of the control loop, as it ensures that the desired actions are taken in response to the system's operating conditions. By providing this translation from control logic to physical movement or action, actuators enable systems to function effectively and respond to changes in the environment or operational goals.