Magnetic Property Modelling of Laminated Silicon Steel Sheets under DC-Biasing Magnetization

The excitation conditions of electrical steel are generally sinusoidal but, with the advent power electronics in recent years, dc-biased excitation is sometimes experienced. In this paper, an efficient method for modeling the global magnetic properties of the silicon steel under dc-biased condition was proposed. The measurement was carried out based on a laminated core model of product level which was designed and made by the authors. However, the DC bias magnetic flux can not be measured directly in the experiment, and then a simulated method was presented to calculate the dc magnetic flux in the iron core. The calculation program was developed based on MATLAB, thus the hysteresis loops of the iron core under biasing magnetization were obtained. In addition, the experimental study on the iron loss of silicon steel was carried out. The different iron loss curves under various dc-biased magnetic field strength were determined. They are necessary for the analysis of dc bias magnetic field and electromagnetic design of products.