Why Do Large Eddy Currents Occur In The Core Of A Constant Voltage Transformer?

The 3 phase constant voltage transformer iron core is essentially a material that can conduct both magnetism and electricity. When the iron core is exposed to alternating magnetic flux, an induced electromotive force (EMF) perpendicular to the magnetic flux appears inside the core. This EMF drives the formation of closed current loops within the conductor, and the current flows back and forth like vortices; this current is called eddy current.

Eddy currents flow inside the iron core but do not participate in the output of electrical energy. They convert electromagnetic energy into heat energy, causing the iron core temperature to rise; this loss is called eddy current loss.

If the constant voltage transformer for home iron core is a solid, integral structure, the eddy current loops are large and continuous, resulting in better conductivity and a greater tendency to form large eddy currents. Under conditions of higher alternating magnetic field frequency or higher magnetic flux density, the induced EMF is stronger, the eddy currents are larger, and the heat loss is more significant.