Wound magnetic core, alloy core, and method for manufacturing wound magnetic core
Provided herein is a method for manufacturing a wound magnetic core of a nanocrystalline soft magnetic alloy ribbon.
1 . A wound magnetic core of a nanocrystalline soft magnetic alloy ribbon,
wherein the wound magnetic core has a non-circular shape, and an impedance relative magnetic permeability μrz at 100 kHz of the wound magnetic core is 45000 or more; and wherein the wound magnetic core has no portion where the nanocrystalline soft magnetic alloy ribbon is spaced apart by 0.1t or more from a nanocrystalline soft magnetic alloy ribbon that is adjacent thereto in a stacking direction, wherein t is a thickness of the wound magnetic core in the stacking direction, and
wherein the nanocrystalline soft magnetic alloy ribbon has a composition represented by (Fe 1-a M a ) 100-x-y-z-α-β-γ Cu x Si y B z M′ α M″ β X γ (atom %),
where M is at least one element selected from Co and Ni, M′ is at least one element selected from Nb, Mo, Ta, Ti, Zr, Hf, V, Cr, Mn and W, M″ is at least one element selected from Al, platinum group elements, Sc, rare earth elements, Zn, Sn and Re, and X is at least one element selected from C, Ge, P, Ga, Sb, In, Be and As,
a, x, y, z, α, β and γ, which define the composition ratio, can satisfy the following relationships;
0≤a<0.5,
0.1≤x≤3,
10≤y≤20,
5≤z≤10,
0.1≤α≤5,
0≤β≤10, and
0≤γ≤10.
2 . The wound magnetic core of a nanocrystalline soft magnetic alloy ribbon according to claim 1 , wherein the wound magnetic core has a racetrack shape or has a racetrack shape with a concave/convex portion along at least one straight portion of the racetrack shape.
3 . The wound magnetic core of a nanocrystalline soft magnetic alloy ribbon according to claim 1 , wherein in a state where an AC magnetic field of frequency f=10 kHz and amplitude H=0.05 A/m is applied, the wound magnetic core has a relative magnetic permeability μ (10 kHz) of 80,000 or more, as measured at room temperature, a direct-current BH loop squareness ratio Br/Bm of 50% or less and a coercive force of 1.1 A/m or less.
4 . An alloy core comprising:
the wound magnetic core of a nanocrystalline soft magnetic alloy ribbon according to claim 1 ; and
a resin with which the wound magnetic core is impregnated.