Broadband magnetic losses in Fe-Si and Fe-Co laminations

We discuss comprehensive broadband (DC – 10 kHz) investigations on magnetic losses in Fe-(3 wt%)Si and Fe-Co laminations. In this range of frequencies, the prediction of loss is not easy, because skin effect can be quite important. The theoretical approach generally relies on a dynamic hysteresis model in association with a diffusion equation, but it imposes heavy computational burden. We present here a computationally efficient dynamic hysteresis model based on the Dynamic Preisach Model (DPM), by which one can achieve fast and precise solution of the diffusion equation taking into account the hysteretic constitutive equation of the material. This is achieved at a greatly reduced computational cost with respect to the standard DPM. The loss results provided by this simplified model are at all frequencies in very good agreement with the prediction by the full DPM and with the experiments.