Hysteresis and Excess Power Loss Components Properties in Grain-Oriented Electrical Sheets

Abstract

The most popular loss model for electrical steel sheets is the three-component model, which divides the specific total loss into hysteresis, classical eddy current, and excess components. The latter component is defined as the difference between the measured loss and the loss calculated using Maxwell's equations. The origin of the excess component has been a subject of debate for many years. Initially, it was associated with hysteresis loss and later with micro-eddy currents. Furthermore, the interdependence of the components complicates their modeling. This paper presents the results of research and analysis of loss components for the three-component model, taking into account the phenomenon of magnetic anisotropy. The studies were conducted on samples of conventional grain-oriented electrical steel sheet for several selected magnetization directions. The results indicate a correlation between the hysteresis and excess components for different magnetization directions. The paper proposes combining both components in a loss model for electrical sheets.