Patent ID: 6646532
Filing Date: 2003-11-11
Classification: H01F

Abstract:
A powder core which is obtained by preparing alloy powder comprising 3.0-8.0 wt % Si, 0.1-1.0 wt % O, 0-2.0 wt % (0 being exclusive) of at least one element selected from Mn, Al, V, Cr, and Ti, and balance Fe and having a particle size substantially equal to 150 &mgr;m or less, mixing the alloy powder and a binder to form a mixture, and press-forming the mixture by the use of a die and which has a 20 kHz a.c. permeability equal to 20 or more under an applied d.c. magnetic field of 12000 A/m, a core loss characteristic of 1000 kW/m3 or less under the conditions of 20 kHz and 0.1 T. saturation magnetization of 10000 G or more, and coercive force of 3.0 Oe or less.