Eddy currents are those which are produced or induced in the mass of metal whenever the metal are moved in magnetic field of the magnetic field is moved across the mass metal so as to link it. The direction of this eddy current is always in opposite direction to the cause to produce them as per lenz’s law.
Eddy current can be calculated by following equation
We = k Bmax2 f2 t2 v watt.
Where k – Constant
Bmax – Maximum flux density
f – frequency of magnetic reversal
t – thickness of each lamination
v – volume if the armature core or mass metal.
Development of eddy current is made use in energy meters to provide controlling torque and also in form of automatic starters in moving coil measuring instruments.
