Method for producing an inductive component and inductive component

Patent metadata

Field	Value
Publication number	US-12327677-B2
Application number	US-202016937122-A
Country	US
Kind code	B2
Filing date	Jul 23, 2020
Priority date	Jul 31, 2019
Publication date	Jun 10, 2025
Grant date	Jun 10, 2025

Abstract

In a method for producing an inductive component, a basic body, which includes a magnetic material, is sintered and subsequently comminuted. The comminuting has the effect of creating sintered particles, which are mixed with a binder to form at least one mixture. The at least one mixture and at least one coil are arranged in a mould and subsequently the binder is activated, so that the sintered particles form with the binder at least one magnetic core, which at least partially surrounds the at least one coil. The method allows easy and low-cost production of the inductive component with improved electromagnetic properties.

First claim

What is claimed is:

1. A method for producing an inductive component with the steps of:
providing a basic body comprising a magnetic material;
sintering the basic body;
comminuting the sintered basic body to form sintered particles;
producing at least one mixture from the sintered particles and a binder, wherein, before producing the at least one mixture, the sintered particles are separated into a first fraction with first sintered particles and into a second fraction with second sintered particles, wherein the first sintered particles and the second sintered particles differ in at least one of a particle form and a particle size;
arranging the at least one mixture and at least one coil in a mold; and
activating the binder in the at least one mixture, so that the sintered particles form with the binder at least one magnetic core, which at least partially surrounds the at least one coil, wherein a first magnetic core is produced with the first sintered particles and a second magnetic core is produced with the second sintered particles, wherein at least 70% of the sintered particles used for producing the at least one mixture have a respective minimum dimension A min , for which the following applies: 10 μm≤A min ≤1000 μm.

2. The method according to claim 1 , wherein the magnetic material comprises at least one ferrite material.

3. The method according to claim 1 , wherein the sintering is performed at a temperature T S , where: T S ≥1000° C.

4. The method according to claim 1 , wherein the sintered particles have a respective aspect ratio and, before producing the at least one mixture, the aspect ratios are at least partially reduced.

5. The method according to claim 1 , wherein, before producing the at least one mixture, the sintered particles are worked by means of a ball mill.

6. The method according to claim 1 , wherein at least 70% of the sintered particles used for producing the at least one mixture have a respective aspect ratio A, for which the following applies: 0.5≤A≤1.

7. The method according to claim 1 , wherein the binder is activated by increasing at least one of the group comprising a temperature and by increasing a pressure.

8. The method according to claim 1 , wherein the at least one mixture is produced in such a way that the following applies for a mass ratio m of the sintered particles to the binder: 75/25≤m≤99/1.

9. The method according claim 1 , wherein the basic body is provided by pressing the magnetic material.

10. A method for producing an inductive component with the steps of:
providing a basic body comprising a magnetic material;
sintering the basic body;
comminuting the sintered basic body to form sintered particles;
producing at least one mixture from the sintered particles and a binder, wherein, before producing the at least one mixture, the sintered particles are separated into a first fraction with first sintered particles and into a second fraction with second sintered particles, wherein the first sintered particles and the second sintered particles differ in at least one of a particle form and a particle size;
arranging the at least one mixture and at least one coil in a mold; and
activating the binder in the at least one mixture, so that the sintered particles form with the binder at least one magnetic core, which at least partially surrounds the at least one coil, wherein a first magnetic core is produced with the first sintered particles and a second magnetic core is produced with the second sintered particles, wherein at least 70% of the first sintered particles have a respective minimum dimension A 1min and at least 70% of the second sintered particles have a respective minimum dimension A 2min , for which the following applies: 500 μm≤A 1min ≤1000 μm and 10 μm≤A 2min ≤500 μm.

11. The method according to claim 10 , wherein for the minimum dimension A 2min of the second sintered particles applies: 100 μm≤A 2min ≤500 μm.

Assignees

• Wuerth Elektronik Eisos Gmbh & Co Kg

Inventors

• Patel Arpankumar

Classifications

• H01F27/28

  Coils; Windings; Conductive connections · CPC title

• H01F27/255

  made from particles (H01F27/26 takes precedence) · CPC title

• H01F17/04

  with magnetic core · CPC title

• H01F1/34

  non-metallic substances, e.g. ferrites · CPC title

• H01F1/22

  pressed, sintered, or bound together · CPC title