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

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

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1 Answers

Saurabh Singh
askIITians Faculty 49 Points
10 years ago

When the magentic core flux varies in a magnetic core with respect to time, voltage is induced in all possible paths enclosing the flux. This will result in the production of circulating currents in the transformer core. These currents are known as eddy currents. These eddy currents leads to power loss called Eddy current loss. This loss depends upon two major factors. The factors affecting the eddy currents are:

  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

Pe= kef2B2W/m3
ke= ke'd2/p

Where,

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

Pe= ke'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

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