Looking for classes? Ksquare Career Institute, Bengaluru →
Transformer: Energy Losses
Concepts tested here
- Eddy current loss
All Questions
2006 AIPMT-PRE 1 question
-
The core of a transformer is laminated because :-The alternating magnetic flux in the iron core of a transformer induces circulating currents in the body of the core, called eddy currents.
These currents heat up the core ($I^2R$ loss) and waste energy.
To reduce them, the core is made of thin sheets (laminations) of soft iron, insulated from one another by a layer of varnish, instead of one solid block.
The laminations break the paths of the eddy currents and increase the resistance offered to them, so the eddy currents and the heat produced become very small.
Lamination does not change the weight appreciably, does not prevent rusting and does not affect the voltage ratio, which depends only on the turns ratio.
So the core is laminated so that energy losses due to eddy currents may be minimised.