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TOPIC : CONSTRUCTION OF DC GENERATOR.
AIM:-
To observe the emf released in an armature coil, between two field bar magnets.
METHOD OF STUDY:-
Take some thin gauged, insulated copper wire and a soft iron piece and wound the copper wire on the soft iron piece (approx 500 turns) and two split rings are fixed with two sides of the soft iron. And the two leads of the wires are soldered on two split rings. And two brushes are also fixed touching the split rings. Terminals of the brushes are connected to a LED.
Two field magnets are placed on two sides of the fixed armature coil, and pulley is fixed on the axial of armature and a narrow belt is put on the pulley.
Picture1
COLLECTED DATA:-
Here the AC induced in the armature coil is converted into DC in the external circuit by an arrangement called split ring commutator.
The flux cut in the first half of the rotation is in one direction and in the opposite direction during the second half rotation. Hence the direction of flow of current in the armature coil changes.
When the direction of the current in the armature coil changes during the successive half rotations, the contact of one half of the split ring shifts from one brush to the other. So the direction of the current in the external circuit does not change.
Picture2
CONCLUSION
Electromagnetic induction is the basis of a DC Generator. When the speed of the rotation is increased, the current is increased.
SUGGESTIONS
- The number of turns of the armature coil is increased.
- The speed of rotation of the armature coil increased, the e m f is increased.
- When power magnets are used, the e m f is increased.
REFERENCES:-
Arjun books, NCERT text.
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| Author: sridhar.v | Member Level: Silver | Revenue Score:  |
very good explanation about the DC genarator.....
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