Inductive component and method for the production thereof
View Patent ↗The invention relates to an inductive component ( 10 ) whose soft magnetic core ( 11 ) is produced by pouring a casting resin into a mold ( 1 a ) filled with a soft magnetic alloy powder and by subsequently hardening the casting resin with the alloy powder in order to form a solid soft magnetic core. Contrary to conventional injection molding methods, this technique prevents the surface insulation of the alloy particles from becoming damaged so that the formation of bulk eddy currents in the resulting soft magnetic cores can be prevented to a large extent. This enables a distinct reduction in the electric loss of the inductive component.
1. Inductive component having at least one coil and a magnetic soft core made from a ferromagnetic powder composite; said ferromagnetic powder composite comprising an alloy powder from a nano-crystalline alloy and a casting resin and said at least one coil being embedded in said ferromagnetic powder composite, wherein the alloy powder is not exposed to a mechanical load during processing.
2. Inductive component in accordance with claim 1 , wherein the alloy powder consists of alloy particles of an average particle size of <2 mm.
3. Inductive component in accordance with claim 2 , wherein the average thickness of the alloy particles ranges between 0.04 mm and 0.5 mm.
4. Inductive component in accordance with claim 2 , wherein the alloy particles are surface oxidized.
5. Inductive component in accordance with claim 2 , wherein the alloy particles are coated with a plastic.
6. Inductive component in accordance with claim 5 , wherein the plastic is silane.
7. Inductive component in accordance with claim 1 , wherein the powder composite shows a saturation magnetization of B S ≧0.5 tesla, and a permeability of 10≦μ≦200.
8. Inductive component in accordance with claim 1 , wherein a polyamide or a polyacrylate is provided as casting resin.
9. Inductive component in accordance with claim 1 , further comprising a casing.
10. Inductive component in accordance with claim 1 , whereby the alloy powder's portion in the powder composite exceeds 55 percent by volume.