00:01
In this question we need to explain how to control the terminal voltage of a separately excited dc generator and that for a dc shunned generator.
00:09
So first let us draw the diagram for the separately excited dc generator.
00:16
So this is the schematic diagram of the excited dc generated separately.
00:22
So we know that the emf generated for this super excised dc generator is.
00:38
Given by this formula.
00:40
Epsilon is equal to pi z into n into p by 60a.
00:46
So here as you can see the epsilon the amf generated is directly proportional to the 5 and we know the formula for the voltage v is equal to epsilon minus ia into ra so here we can also say that voltage is directly proportional to the epsilon from this given equation.
01:08
So from these two equations we can say that epsilon is directly proportional to the 5 and v is directly proportional to epsilon so combining these two equations you will see that voltage is directly proportional to the epsilon so as a result we can say that the terminant voltage of separately excited dc generator is controlled by changing supply voltage of the external source so terminated voltage can be controlled by controlling the field excitation for a separately excited dc generator so whereas in case of dc shent generator dc shent generator so this is the schematic diagram for the dc shunt generator and the formula for calculating the emf epsilon is equal to 5 znp by 60a so in this from this formula as you can see epsilon is directly proportional to 5 epsilon is directly proportional to the speed and ethl is direction of the p and z, p and i.
02:16
So the terminal voltage of the self -excited machine can be varied by changing the excitation provided to the armature...