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REGULATOR

REGULATOR

REGULATOR: -
 A REGULATOR IS A FEED BACK CONTROL SYSTEM IN WHICH THE OUTPUT IS MAINTAINED AT A PRESET VALUE IRRESPECTIVE OF EXTERNAL LOAD ON THE PLANT. THE REFERENCE INPUT OR COMMAND SIGNAL, ALTHOUGH ADJUSTABLE, IS HELD CONSTANT FOR LONG PERIODS OF TIME. THE PRIMARY TASK IS THEN TO MAINTAIN THE OUTPUT AT THE DESIRED VALUE IN THE PRESENCE OF DISTURBANCES. EXAMPLES OF AN AUTOMATIC REGULATOR ARE; REGULATION OF STEAM SUPPLY IN STEAM ENGINES BY THE FLY BALL GOVERNOR; THERMOSTAT CONTROL OF HOME HEATING SYSTEM; CONTROL OF PRESSURE AND OF ELECTRICAL QUANTITIES SUCH AS VOLTAGE, CURRENT AND FREQUENCY.

IN GENERAL, A CONTROL SYSTEM THAT REGULATES A VARIABLE IN RESPONSE TO A FIXED COMMAND SIGNAL IS KNOWN AS A REGULATOR SYSTEM WHEREAS CONTROL SYSTEM THAT ACCURATELY FOLLOWS CHANGES IN THE COMMAND SIGNAL IS REFERRED TO AS FOLLOW UP SYSTEM.


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