Eddy Currents

“Eddy Currents”, are currents induced by conductors from a changing magnetic field according to Faraday’s law of induction. Basically, a time-varying magnetic field induces an emf which causes loops of currents. They are closed-loop and perpendicular to the plane of its inducing magnetic field. The eddy currents and the resistance of the core material produces an $I^{2}R$ loss.

Power Loss

$P_{eddy}=K_{e}V{\left(B_{\max }tf\right)}^2$

Reducing Eddy Currents

To reduce eddy currents, you can layer ferromagnetic materials for the code with laminations in between them