Development of Block Cores Comprising High- $B_{s}$ Nanocrystalline Alloy Ribbon

Soft magnetic properties of block cores comprising Fe bal. Cu 1 Mo 0.2 Si 4 B 14 nanocrystalline alloy ribbons (HBN core) were investigated. The HBN core shows a magnetic flux density at 2000 A/m (B 2000 ) of 1.73 T, which is about 0.2 T higher than that of the core comprising Fe-based amorphous alloy ribbons (Fe-AM core). The core loss at 200 mT and 10 kHz is 8.5 W/kg, two thirds of that of the Fe-AM core. The coefficient of the excess eddy current loss for the HBN core is one half of that of the Fe-AM core; the difference in core loss is prominent at higher frequencies.