The armature of DC generator is laminated to
The armature of DC generator is laminated to
Right Answer is:
Reduce eddy current loss
SOLUTION
Why is Armature of DC Generator Laminated?
- Eddy Current is the form of power loss and magnetic loss.
- Eddy current loss produce heat and decrease motor efficiency.
- Eddy current losses are directly proportional to the area of the armature or more precisely the path of motion.
- Consider an armature with a single piece of iron.
Eddy current losses without Lamination - In this case, the eddy current losses are represented by Red lines.
- Now consider lamination armature, a complete lamination is made up of four or six or even eight segment lamination.
Eddy current losses with Lamination
- These laminations are insulated from each other by the thin coating of varnish or any other insulating material.
- These individual, thin pieces have lesser area and higher resistance than one solid piece, and therefore, produce fewer eddy currents.
- With laminated armature, eddy current losses are reduced to very less
NOTE = Thinner the laminations, greater is the Resistance offered to induced e.m.f. Therefore smaller the current hence lesser eddy current loss.
- That is why armature of DC machines (either motor or generator) is laminated.