電磁鋼板における高周波磁気特性のモデリング  [in Japanese] Modeling of the High-Frequency Magnetic Properties of Electrical Steel Sheets  [in Japanese]

The magnetic properties of electrical steel sheets at high frequency can be estimated from the skin effect. Thepermeability deteriorates, and the eddy current loss becomes smaller than the values calculated from those at low frequency, owing to the skin effect. However, hysteresis loss increases, and cannot be neglected even at high frequency, because the skin effect increases the flux density at the surface. Consequently, the ratio of hysteresis loss to eddy current loss becomes constant, and both losses have the same frequency dependences. At higher frequency, the skin effect becomes stronger, magnetic saturation at the surface increases, and the frequency depedences of losses become similar to those at low frequency.