Closed-loop controller: Difference between revisions

Revision as of 01:04, 12 March 2023

Revision as of 20:48, 26 March 2023

Line 1:

[[File:Industrial control loop.jpg|thumb|300px|Example of a single industrial control loop; showing continuously modulated control of process flow.]]

A '''closed-loop controller''' or '''feedback controller''' is a [[control loop]] which incorporates [[feedback]], in contrast to aan ''[[open-loop controller]]'' or ''[[non-feedback controller]]''.

A closed-loop controller uses feedback to control [[state (controls)|states]] or [[Negative feedback#Overview|outputs]] of a [[dynamical system]]. Its name comes from the information path in the system: process inputs (e.g., [[voltage]] applied to an [[electric motor]]) have an effect on the process outputs (e.g., speed or torque of the motor), which is measured with [[sensor]]s and processed by the controller; the result (the control signal) is "fed back" as input to the process, closing the loop.