How eddy current losses in transformer are proportional to square of the thickness of the lamination?

1. Resistivity of the core and
2. Length of the path of the circulating currents for a given cross section.

The eddy currents can be expressed as

P_e= k_ef²B²W/m3
k_e= k_e'd²/p

Where,

d is the thickness of the lamination
p is the resistivity of material of the core

P_e= k_e'd²f²B²/p W/m3

Hence from the above equations it is evident that Eddy current loss is directly proportional to the square of the thickness of the lamination and that of the frequency of supply voltage.

Thanks & Regards

Saurabh Singh,

askIITians Faculty

B.Tech.

IIT Kanpur