PPT: Governors | Theory of Machines (TOM) - Mechanical Engineering PDF Download

 Page 1


INTRODUCTION
• The  function of a governor is to regulate the 
mean speed of an engine, when there are 
variations in the load 
• For example, when the load on an engine 
increases, its speed decreases, therefore it 
becomes necessary to increase the supply of 
working fluid.
• On the other hand, when the load on the engine 
decreases, its speed increases and thus less 
working fluid is required.
Page 2


INTRODUCTION
• The  function of a governor is to regulate the 
mean speed of an engine, when there are 
variations in the load 
• For example, when the load on an engine 
increases, its speed decreases, therefore it 
becomes necessary to increase the supply of 
working fluid.
• On the other hand, when the load on the engine 
decreases, its speed increases and thus less 
working fluid is required.
• The governor automatically controls the 
supply of working fluid to the engine with the 
varying load condition and keeps the mean 
speed within certain limits.
• A little consideration will show that, when the 
load increases, the configuration of the 
governor changes and a value is moved to 
increase the supply of the working fluid ; 
conversely, when the load decreases, the 
engine speed increases and the governor 
decreases the supply of working fluid.
Page 3


INTRODUCTION
• The  function of a governor is to regulate the 
mean speed of an engine, when there are 
variations in the load 
• For example, when the load on an engine 
increases, its speed decreases, therefore it 
becomes necessary to increase the supply of 
working fluid.
• On the other hand, when the load on the engine 
decreases, its speed increases and thus less 
working fluid is required.
• The governor automatically controls the 
supply of working fluid to the engine with the 
varying load condition and keeps the mean 
speed within certain limits.
• A little consideration will show that, when the 
load increases, the configuration of the 
governor changes and a value is moved to 
increase the supply of the working fluid ; 
conversely, when the load decreases, the 
engine speed increases and the governor 
decreases the supply of working fluid.
• The function of a flywheel in an engine is entirely 
different from that of a governor.
• It controls the speed variation caused by the 
fluctuation of the engine turning moment during 
each cycle of operation.
• It does not control the speed variation caused by 
a varying load.
• The varying demand for power is met by the 
governor regulating the supply of working fluid.
Page 4


INTRODUCTION
• The  function of a governor is to regulate the 
mean speed of an engine, when there are 
variations in the load 
• For example, when the load on an engine 
increases, its speed decreases, therefore it 
becomes necessary to increase the supply of 
working fluid.
• On the other hand, when the load on the engine 
decreases, its speed increases and thus less 
working fluid is required.
• The governor automatically controls the 
supply of working fluid to the engine with the 
varying load condition and keeps the mean 
speed within certain limits.
• A little consideration will show that, when the 
load increases, the configuration of the 
governor changes and a value is moved to 
increase the supply of the working fluid ; 
conversely, when the load decreases, the 
engine speed increases and the governor 
decreases the supply of working fluid.
• The function of a flywheel in an engine is entirely 
different from that of a governor.
• It controls the speed variation caused by the 
fluctuation of the engine turning moment during 
each cycle of operation.
• It does not control the speed variation caused by 
a varying load.
• The varying demand for power is met by the 
governor regulating the supply of working fluid.
Type of governor
• The governors may, broadly. Be classified as
1. Centrifugal governor
2. Inertia governor
Page 5


INTRODUCTION
• The  function of a governor is to regulate the 
mean speed of an engine, when there are 
variations in the load 
• For example, when the load on an engine 
increases, its speed decreases, therefore it 
becomes necessary to increase the supply of 
working fluid.
• On the other hand, when the load on the engine 
decreases, its speed increases and thus less 
working fluid is required.
• The governor automatically controls the 
supply of working fluid to the engine with the 
varying load condition and keeps the mean 
speed within certain limits.
• A little consideration will show that, when the 
load increases, the configuration of the 
governor changes and a value is moved to 
increase the supply of the working fluid ; 
conversely, when the load decreases, the 
engine speed increases and the governor 
decreases the supply of working fluid.
• The function of a flywheel in an engine is entirely 
different from that of a governor.
• It controls the speed variation caused by the 
fluctuation of the engine turning moment during 
each cycle of operation.
• It does not control the speed variation caused by 
a varying load.
• The varying demand for power is met by the 
governor regulating the supply of working fluid.
Type of governor
• The governors may, broadly. Be classified as
1. Centrifugal governor
2. Inertia governor
CENTRIFUGAL GOVERNOR