US 9,812,237 B2
Soft magnetic core with position-dependent permeability
Jivan Kapoor, Wiesbaden (DE); and Christian Polak, Blankenbach (DE)
Assigned to VACUUMSCHMELZE GMBH & CO. KG, Hanau (DE)
Appl. No. 14/394,841
Filed by Vacuumschmelze GmbH & Co. KG, Hanau (DE)
PCT Filed Apr. 12, 2013, PCT No. PCT/EP2013/057652
§ 371(c)(1), (2) Date Oct. 16, 2014,
PCT Pub. No. WO2013/156397, PCT Pub. Date Oct. 24, 2013.
Claims priority of application No. 10 2012 206 225 (DE), filed on Apr. 16, 2012.
Prior Publication US 2015/0070124 A1, Mar. 12, 2015
Int. Cl. H01F 27/28 (2006.01); H01F 3/00 (2006.01); H01F 3/10 (2006.01); H01F 17/06 (2006.01); H01F 41/02 (2006.01); H01F 3/04 (2006.01); H01F 3/08 (2006.01); H01F 1/153 (2006.01)
CPC H01F 3/00 (2013.01) [H01F 3/04 (2013.01); H01F 3/08 (2013.01); H01F 3/10 (2013.01); H01F 17/06 (2013.01); H01F 27/28 (2013.01); H01F 41/0213 (2013.01); H01F 41/0246 (2013.01); H01F 1/15333 (2013.01); H01F 2003/106 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A soft magnetic core, comprising at least a first portion having a first magnetic permeability and a second portion having a second magnetic permeability which is different from said first magnetic permeability and wherein a ratio of said first magnetic permeability to said second magnetic permeability is 1:1.1 or greater, and wherein said core comprises a soft magnetic tape and wherein said soft magnetic tape has a length and wherein a magnetic permeability of said tape increases over said length as said tape is radially wound from an interior of said core outwardly so that said magnetic permeability of said core increases in a radial direction moving outward from said interior of said core.