Abstract
This paper focuses on an evaluation of core losses in laminated magnetic block cores assembled with a high Bs nanocrystalline alloy in high magnetic flux density region. To discuss the soft magnetic properties of the high Bs block cores, the comparison with amorphous (SA1) block cores is also performed. In the high Bs block core, both low core losses and high saturation flux densities Bs are satisfied in the low frequency region. Furthermore, in the laminated block core made of the high Bs alloy, the rate of increase of iron losses as a function of the magnetic flux density remains small up to around 1.6 T, which cannot be realized in conventional laminated block cores based on amorphous alloy. The block core made of the high Bs alloy exhibits comparable core loss with that of amorphous alloy core in the high-frequency region. Thus, it is expected that this laminated high Bs block core can achieve low core losses and high saturation flux densities in the high-frequency region.
Highlights
Soft magnetic materials such as Si-steels, Fe-based amorphous alloys, conventional nanocrystalline alloys (Fe-Si-B-Cu-Nb, FT-3M),[1] and high Bs nanocrystalline alloys[2] have been developed for use as electrical power devices such as transformers, inductors, and motors
In the high Bs block core, both low core losses and high saturation flux densities Bs are satisfied in the low frequency region compared to the case of the amorphous block core
This work examines for the first time the laminated magnetic block core assembled with the high Bs alloy in high magnetic flux density region
Summary
Soft magnetic materials such as Si-steels, Fe-based amorphous alloys, conventional nanocrystalline alloys (Fe-Si-B-Cu-Nb, FT-3M),[1] and high Bs nanocrystalline alloys[2] have been developed for use as electrical power devices such as transformers, inductors, and motors. For these electronics applications, to achieve high effectiveness, efficiency, and miniaturization, both low core losses and higher saturation flux densities Bs are required. The authors have published a paper[14] in a conference to discuss a part of the experimental results of this work
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