Magnetic Core

• US 20080074220A1
• Filed: 09/28/2007
• Published: 03/27/2008
• Est. Priority Date: 04/01/2005
• Status: Active Grant

• Current Assignee: Vacuumschmelze GmbH & Company KG (Vectra Corp.)
• Original Assignee: Vacuumschmelze GmbH & Company KG (Vectra Corp.)
• Inventors: Guenther, Wulf
• Granted Patent: US 7,782,169 B2
• Time in Patent Office: Days
• US Class Current: 335/297
• CPC Class Codes: H01F 1/153 Amorphous metallic alloys, e.g. glassy metals making ferrous amorphous alloys C22C33/003
• CPC Class Codes: H01F 1/15333 containing nanocrystallites, e.g. obtained by annealing
• CPC Class Codes: H01F 17/0006 Printed inductances printed coils for dynamo-electric machines H02K3/26; printed circuits H05K
• CPC Class Codes: H01F 2017/0066 with a magnetic layer
• CPC Class Codes: H01F 3/04 made from strips or ribbons

Abstract

A magnetic core (1, 1′, 20, 28, 29, 58, 61, 70, 70′, 80, 80′, 90) for a magnetic component has a longitudinal axis parallel to which a magnetic current is to be substantially guided inside the magnetic core. The magnetic core consists of a plurality of magnetic elements (2, 3, 4, 5, 6, 7, 8, 29, 30, 35, 36, 38, 39, 40, 48, 49, 52, 53) shaped like bars or strips arranged parallel to one another, at least one of the magnetic elements (2, 3, 4, 5, 6, 7, 8, 29, 30, 35, 36, 38, 39, 40, 48, 49, 52, 53) is different from the other magnetic elements in one or several of the following characteristics: permeability of material, curvature, length, shape and/or size of surface area, presence, type and location of notches in the magnetic elements.

Claims

1. A magnetic core made of metallic alloy having a linear or curved longitudinal axis, parallel to which a magnetic flux is to be guided essentially inside the magnetic core, the magnetic core being assembled from multiple rod-shaped or strip-shaped magnetic elements implemented parallel to one another, wherein at least one of the magnetic elements differs from the others in one or more of the following features:

material permeability,

curvature,

length,

shape and/or size of the cross-sectional area,

presence, type, and position of notches in the magnetic elements.

2. The magnetic core according to claim 1, wherein multiple of the magnetic elements differ from other magnetic elements in regard to one of the features as a function of their position within the magnetic core.

3. The magnetic core according to claim 1, wherein the multiple magnetic elements are symmetrically distributed among the other magnetic elements in regard to the cross-section of the magnetic core in relation to a central axis or a central plane.

4. The magnetic core according to claim 1, wherein, viewed from the longitudinal axis running in the center of the magnetic core outward toward at least one side, the magnetic elements have, with increasing distance

a decreasing material permeability and/or

a decreasing length and/or

an increasing curvature away from the longitudinal axis and/or

a thickness which becomes smaller and/or

an increasing number and/or growing depth of notches.

5. The magnetic core according to claim 4, wherein the magnetic core is constructed mirror symmetric in relation to a central plane which contains the longitudinal axis.

6. The magnetic core according to claim 4, wherein the magnetic core is constructed radially symmetric in relation to its longitudinal axis.

7. The magnetic core according to claim 1, wherein the magnetic elements laid on one or more lateral faces of the magnetic core differ from the other magnetic elements in regard to at least one of the features.

8. The magnetic core according to claim 7, wherein a continuous or step-by-step transition in regard to the extent of the differences in relation to one of the features is provided between the magnetic elements laid on the lateral faces of the magnetic core and the longitudinal axis of the magnetic core.

9. The magnetic core according to claim 1, wherein the magnetic elements laid directly on a lateral face of the magnetic core are curved away at their ends from the longitudinal axis of the magnetic core.

10. The magnetic core according to claim 1, wherein the magnetic elements are implemented as strip-shaped, and at least the outer magnetic elements of the magnetic core have one or more notches, which run parallel to one another and completely penetrate the particular magnetic element, and which extend from the end of the particular magnetic element therein and divide it in width.

11. The magnetic core according to claim 1, wherein the magnetic elements comprise a soft-magnetic material, in particular a nanocrystalline material or a glass-like magnetic material produced by rapid solidification technology.

12. The magnetic core according to claim 1, wherein some of the magnetic elements have an enlarged cross-sectional area toward their ends, and in particular others of the magnetic elements have a reduced cross-sectional area toward their ends.

13. The magnetic core according to claim 12, wherein those magnetic elements which have enlarged cross-sectional areas toward their ends are situated in the center of the magnetic core, while magnetic elements having a cross-sectional area remaining uniform over their length or decreasing toward the ends are situated on the exterior sides of the magnetic core.

14. A configuration having a magnetic core according to claim 1, wherein the configuration further comprises an electrically conductive winding enclosing the magnetic core, wherein the turn density increases toward at least one of the ends of the magnetic core.

15. A configuration having a magnetic core according to claim 1, wherein the configuration further comprises an electrically conductive winding enclosing the magnetic core, wherein the winding extends axially beyond its end on at least one end of the magnetic core.

16. A configuration having a magnetic core according to claim 1, wherein the configuration further comprises an electrically conductive winding enclosing the magnetic core, wherein the turn density increases toward at least one end of the magnetic core and the winding extends axially beyond its end on at least one end of the magnetic core.

17. A configuration having a magnetic core according to claim 1, comprising an additional magnetically active body, due to whose presence the magnetic flux enters and/or exits the magnetic core asymmetrically.

18. The configuration according to claim 15, wherein the body is an electrically conductive body.

19. The configuration according to claim 17, wherein the body comprises a material having a magnetic permeability >

1.

20. The configuration according to claim 17, wherein the magnetic core is implemented and situated in such a way that the magnetic flux predominantly exits at edges of the magnetic elements.