Powder core and reactor using the same
AssigneeNEC Tokin Corporation
InventorsTeruhiko Fujiwara, Masayoshi Ishii, Yoshitaka Saito
Life of this patent
Estimating the term…
Abstract
Preparation is made of 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 μm or less. A binder is mixed with the alloy powder to form a mixture. The mixture is compaction-formed by the use of a die. Thus, a powder core is obtained 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 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.
Claims7
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 μm 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.
Dependencies are inferred from the claim text.