Calculation of iron losses in ferrite toroids using FEM and complex vectors

In this paper the FEM based approach is used to analyse the electromagnetic field distribution in a ferrimagnetic core with rectangular cross section. This numerical method provides a way to accurately visualise the field dis tribution. The iron losses which consist of magnetic loss, dielectric loss and eddy current loss are calculated separately based upon the electromagne tic field distribution. From these calculated results, it is found that at low frequency the magnetic loss is the major contributor to the total losse s, but when frequency reaches the MHz range the dielectric loss becomes sig nificant and can't be neglected. The calculated results are also compared w ith measured results and good agreement between the two values is achieved.