In the beginning the transformer
was a simple electromagnetic device, generally presenting
a low performance, as its core was made of soft iron,
arisen a high degree of magnetization or inductance. In
order to keep these core losses as lower as possible it
was arranged in a pile of stacked insulated thin plates.
A part of these core losses, which increase with the frequency,
were formed by Eddy Current losses, which are caused by
currents perpendicular to the alternating field of the
core. The continuous improvement in the electrical circuits
used in the several electronic fields such as: television,
radio broadcasting, audio, etc, generally by operating
in high frequencies required even more better types of
transformers. In this way due continuous evolution of
the material science, it gave birth of new kind of magnetic
materials such as the Ferrite, Alnico and the Ferroxcube
which soon were used to manufacture better and reliable
transformers. |