Question

Explain Eddy Currents. How it be reduced?

Answer 1

Answer:

The magnitude of the current can be reduced by splitting the solid core into thin sheets called laminations, in the plane parallel to the magnetic field. ... As the area through which the current is passed is smaller, the resistance of eddy current path increases.

Answer 2

Explanation:

The eddy current loss is significant only in AC power applications; the higher the frequency the greater the eddy current loss can be. Especially in a transformer core, if the core is solid metal (usually iron), the eddy currents are expansive, in counter to the coil current. To reduce the eddy current loss, the first way is by laminating the core -- that's why you usually see transformers having many layers or stripes on the sides. An even better way is to design a ferrite core made of fine grains of iron oxide, manganese-zinc ferrite [Mn(0.5)Zn(0.5)Fe2O4], or nickel-zinc ferrite [Ni(0.5)Zn(0.5)Fe2O4)] embedded in ceramic or epoxy. Thus the eddy currents are restricted to a microscopic domain, and are more easily reversible with the high-frequency AC current.