Abstract
Ultra-thin Fe-6.5 wt. % Si ribbons of 35 μm in thickness were prepared by melt-spinning. The magnetic properties were investigated before and after annealing at 1000 °C. The DC properties and low-frequency (400 Hz~10 kHz) iron losses significantly improved after heat treatment. A simplified formula— P t = k t B m N —based on the Steinmetz law, which can be used to predict the AC iron loss, is presented. The symbols “kt” and “N” are defined as functions of microstructure and frequency. According to the tested results of iron loss, the values of “kt” and “N” can be fitted and therefore the simplified formula can be determined. The extent of AC iron losses can be predicted according to the formula. The results obtained from the formula predict AC iron loss to a good degree. The method developed in this work could be extended to other magnetic materials for predicting AC iron loss with greater ease.
Highlights
Silicon steels are mainly used in transformers, power generators, and motors as important soft magnetic materials
The direct current (DC) properties of Fe-6.5 wt. % Si ribbons are shown in Table 1, and it is evident that the DC
After being subjected to 1000 ◦ C for 0.5 h, each grain extends through the entire thickness, and the grain size increases from a few microns to about
Summary
Silicon steels are mainly used in transformers, power generators, and motors as important soft magnetic materials. Core loss occurs due to hysteresis and eddy current circulation during usage, wherein the hysteresis loss is proportional to the frequency, and the eddy current loss is proportional to the square of the frequency. Eddy current loss accounts for a large proportion in high-frequency use. Compared with ordinary silicon steel, Fe-6.5 wt. % Si (high silicon steel) alloy has many advantages in terms of magnetic properties, such as its properties of near-zero magnetostriction, high permeability, high resistivity, and low core loss [1]. The high resistivity aids in the suppression of the eddy current and leads to a significant reduction in eddy current loss. Due to the brittleness of Fe-6.5 wt.
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