Core for inductive element, and inductive element

Patent metadata

Field	Value
Publication number	US-12033781-B2
Application number	US-201916967011-A
Country	US
Kind code	B2
Filing date	Oct 9, 2019
Priority date	Oct 22, 2018
Publication date	Jul 9, 2024
Grant date	Jul 9, 2024

Abstract

The invention concerns a core for an inductive element with at least a first side part, a middle part and a second side part, wherein the middle part has a central portion, a first edge portion arranged parallel to the central portion, and a second edge portion arranged parallel to the central portion, wherein the central portion is arranged between the first and second edge portions, wherein at least one plastic component is provided which is provided at least between the central portion and the first edge portion and/or at least between the central portion and the second edge portion, in order to adjust a stray capacitance of the inductive element and influence a secondary magnetic flux of the inductive element.

First claim

The invention claimed is:

1. A core for an inductive element, comprising
at least a first side part, a middle part and a second side part,
the middle part including a central portion defining a central portion axis, a first edge portion extending parallel to the central portion axis, and a second edge portion extending parallel to the central portion axis, wherein the central portion is between the first and second edge portions,
further wherein the first side part, the middle part and the second side part are positioned in order along the central portion axis; and

at least one plastic component configured to receive the first edge portion, the second edge portion and the middle portion therethrough such that the plastic component is at least between the central portion and the first edge portion and/or at least between the central portion and the second edge portion, in order to adjust a stray capacitance of the inductive element by suitable choice of the dielectric constant ε r of the plastic used for the plastic component and to influence a secondary magnetic flux of the inductive element by suitable choice of the relative permeability μ r of the plastic used for the plastic component,
wherein the plastic component is formed as a plate-like or board-like web arranged perpendicularly to the central portion of the middle part, the first edge portion and the second edge portion, and comprises three passage openings for receiving the central portion of the middle part, the first edge portion and the second edge portion.

2. A core according to claim 1 , characterized in that a dielectric constant of the plastic component lies in the range from 1 to 50, in particular in the range 1 to 10.

3. A core according to claim 1 , characterized in that the plastic component is formed from a plastic with low magnetic permeability.

4. A core according to claim 1 , wherein the plastic component is made from silicone, polyamide, isoprene or latex.

5. A core according to claim 1 , wherein the plastic contains an admixture of carbon, glass granulate, a ceramic compound and/or viscose.

6. A core according to claim 1 , wherein the plastic component fixes the central portion, the first edge portion and the second edge portion in a defined position relative to each other.

7. A core according to claim 1 , wherein the plastic component surrounds the central portion of the middle part at least over part of the length of the central portion.

8. A core according to claim 1 , wherein a first of the three passage openings is adapted to the cross-section of the central portion of the middle part, a second of the three passage openings is adapted to the cross-section of the first edge portion, and a third of the three passage openings is adapted to the cross-section of the second edge portion.

9. A core according to claim 8 , wherein the central portion of the middle part, the first edge portion and/or the second edge portion are fixed by clamping in the respective passage opening.

10. A core according to claim 1 , wherein the first side part and the second side part generally have a cross-section of similar form to the letter E.

11. A core according to claim 10 , wherein the first side part and the second side part are formed as an E core, PQ core, ETD core or RM core.

12. A core according to claim 1 , wherein the plastic component has a base plate from which a plate-like or board-like web protrudes perpendicularly, wherein the base plate is provided for fixing the first side part and the second side part of the core.

13. A core according to claim 12 , wherein on its side facing away from the plate-like or board-like web, the base plate is provided with fixing means, in particular latching means or clamping means.

14. An inductive component with a core according to claim 1 and at least one coil which at least partially surrounds the central portion of the middle part.

15. An inductive component according to claim 14 , wherein a dielectric constant of the plastic of the plastic component is matched to an inductance of the coil in order to obtain a defined resonant frequency of the inductive component.

Assignees

• Wuerth Elektronik Eisos Gmbh & Co Kg

Inventors

• Stark Markus

Classifications

• H01F27/346

  Preventing or reducing leakage fields (using magnetic shields H01F27/36; using auxiliary windings H01F27/38) · CPC title

• H01F27/266

  Fastening or mounting the core on casing or support (on coil H01F27/30) · CPC title

• H01F27/24 Primary

  Magnetic cores · CPC title

• H01F3/12 Primary

  Magnetic shunt paths · CPC title