Patent ID: 6507262
Filing Date: 2003-01-14
Classification: H01F

Abstract:
Magnetic core suitable for use in a current transformer, characterized in thatit consists of a wound band (B) made of an amorphous, ferromagnetic alloy, in which at least 50% of the volume of the alloy is occupied by fine crystalline particles with an average particle size of 100 nm or less (nanocrystalline alloy), it has a permeability which is larger than 12,000 and smaller than 300,000, it has a saturation magnetostriction whose amount is smaller than 1 ppm, it is essentially free from mechanical stress, it has an anisotropy axis (A) along which the magnetization of the magnetic core (M) aligns itself particularly easily and which is orthogonal to a plane in which a center line of the band (B) runs, the alloy has a composition which essentially consists of the formula FeaCobCucSidBeMf wherein M is at least one of the elements V, Nb, Ta, Ti, Mo, W, Zr, and Hf, a, b, c, d, e, f are indicated in atom %, and a, b, c, d, e, and f meet the following conditions:0.5&lE;c&lE;2; 6.5&lE;d&lE;18; 5&lE;e&lE;14; 1&lE;f&lE;6; with d+e>18 and 0&lE;b&lE;15, whereby a+b+c+d+e+f=100.