Characteristics curve of porter governor between speed and height
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EXPERIMENT 2
PORTER GOVERNOR
AIM:
To determine the controlling force, friction force and effort of governor and to draw thecharacteristic curves.
THEORY:
The function of a governor is to maintain the speed of an engine within specified limits wheneverthere is a variation of load. It maintains speed within set limits from no load on the engine to fullrated load on the engine. If a governor is to regulate satisfactorily it must posses certainfundamental qualities. In the first instance a governor must be so designed that the engine candevelop maximum power when the sleeve reaches the bottom of its travel. Further if the engineload is suddenly removed, the sleeve must reach the top of its travel before the speed isexcessively increased. Under normal running conditions this sleeve should float steadily in amean position between these extreme limits i.e., the governor must be stable. In addition, it must be sensitive, i.e., it must respond readily to speed change. Lastly, it must be capable of exertingsufficient effort at the sleeve to operate the control mechanism.Porter Governor
Controlling Force
:The constraining forces, which control the movement of the balls in a centrifugalgovernor, in whatever manner they may be applied, can be regarded as equivalent to a singleinward radially force F acting at the center of each ball. This force
F
is called the ControllingForce.

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