note on construction,working and properties of DC generator
Answers
1.Magnetic Field System of DC Generator
2 .Magnetic Frame and Yoke
3 .Pole Core and Pole Shoes
4 .Field or Exciting Coils
5.Armature of DC Generator
6.Armature Core
7.Armature Windings
8.Commutator in DC Generator
9.Brushes
10.End Housings
11.Bearings
12.Shaft
WORKING:
According to Fleming’s right hand rule, the direction of induced current changes whenever the direction of motion of the conductor changes. Let’s consider an armature rotating clockwise and a conductor at the left is moving upward. When the armature completes a half rotation, the direction of motion of that particular conductor will be reversed to downward. Hence, the direction of current in every armature conductor will be alternating. If you look at the above figure, you will know how the direction of the induced current is alternating in an armature conductor. But with a split ring commutator, connections of the armature conductors also gets reversed when the current reversal occurs. And therefore, we get unidirectional current at the terminals.
