A. Reduce hysteresis loss
B. Reduce hysteresis & eddy current loss
C. Minimize eddy current loss
D. Copper loss
Answer: C. Minimize eddy current loss
Explanation:
n a transformer, the eddy current loss is proportional to the square of the diameter of the core.
Larger the diameter, the more the eddy current loss.
In eddy current, the magnetic field that induces a voltage in the secondary of a transformer also induces a voltage in the core.
This causes circulating (or eddy currents) in the core.
Making the laminations as thin as possible reduces this loss.
The laminations are coated with a thin insulating material to prevent current from flowing between them.
Hence the transformer core is laminated so that the net effective diameter of the transformer core reduces and thus eddy current loss can be minimized.
High resistivity conducting path: To minimize any ‘eddy currents’ (circulating currents) resulting from undesirable voltages induced into the core; eddy currents are further minimized by manufacturing the core from laminations.