1995 Volume 19 Issue 1 Pages 39-44
The frequency dependence in the equivalent circuit of an electrical steel sheet core was improved by the use of a new equivalent circuit, in which each parallel circuit consists of a real inductance, an imaginary inductance, and a resist- ance, which are related to a permeability, a hysteresis loss, and an eddy current loss, respectively. The parallel circuits are connected in series in order to represent the distribu- tion of magnetic properties in an electrical steel sheet as regards their polycrystal and texture. The distribution coefficients of both hysteresis loss and eddy current loss are 0.6-1 for non-oriented electrical steel sheets, and 0.1-0.6 for grain-oriented electrical steel sheets. The frequency dependence of the impedance of a new equivalent circuit is consistent with those of the permeability and iron loss of an electrical steel sheet, measured with a modified Hay bridge.
