On the excess loss in FeSiAl soft magnetic composites

Aiming at the issue of inconsistent theoretical expression of excess loss in soft magnetic composites, the irrational linear frequency dependence of excess loss W ex is analyzed. By comparing and analyzing the experimental data of magnetic loss of FeSiAl core under different transverse magnetic fields with the theoretical results, it is determined that the excess loss of FeSiAl composite is proportional to the 1/2th power of the frequency. Meanwhile, it is experimentally discovered that there is a positive correlation between the hysteresis loss and the excess loss of FeSiAl magnetic core, which might provide an effective approach to reduce the excess loss of FeSiAl magnetic core.