What is it about?
Electrical steel sheets with excellent soft magnetic properties are important materials used as the iron core of transformers and motors. Recently, new electrical steel sheets have been developed by the CVD (Chemical Vapour Deposition) method. In particular, the Si-gradient steel sheet having the silicon concentration gradient in the thickness direction has unique characteristics different from the conventional materials. In this study, we discussed its magnetization mechanism.
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Why is it important?
In the Si-gradient steel sheet produced by the CVD method, internal stress is distributed such that tensile occurs in the surface layer and compressive occurs in the inner layer. The stress induced magnetic anisotropy is presumed to play an important role in the magnetization process of the Si-gradient steel sheet. The low eddy current losses of the Si-gradient steel sheet can be explained as the skin effect of magnetic flux caused by the internal stress.
Perspectives
A new function can be imparted to the material by Si concentration gradient control. This technology is extremely effective for reducing the high frequency iron loss of electrical steel sheets, and we hope that it will contribute to effective use of electric power and conservation of the global environment.
Tatsuhiko Hiratani
Read the Original
This page is a summary of: Magnetization Mechanism of Si-Gradient Steel Sheet Manufactured by CVD Siliconizing Process, Electrical Engineering in Japan, July 2015, Wiley,
DOI: 10.1002/eej.22740.
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