Method of manufacturing soft magnetic dust core
US-2021031268-A1 · Feb 4, 2021 · US
Method of manufacturing a dust core and the dust core
US12567538B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12567538-B2 |
| Application number | US-202118028667-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 28, 2021 |
| Priority date | Sep 30, 2020 |
| Publication date | Mar 3, 2026 |
| Grant date | Mar 3, 2026 |
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- Title
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- Abstract
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- First independent claim
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- CPC / IPC classifications
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Abstract
Official abstract text for this publication.
A dust core is manufactured by compacting magnetic particles in a metal die while heating the magnetic particles at a predetermined temperature in the metal die. At least some of the magnetic particles are coated with coating material. The metal die comprises a die, an upper punch and a lower punch. The upper punch is positioned above the lower punch in an up-down direction. The metal die is provided with a low-temperature portion and a high-temperature portion. A temperature of the low-temperature portion is less than a temperature of the high-temperature portion by 10° C. or more.
First claim
Opening claim text (preview).
The invention claimed is: 1 . A dust core including magnetic particles at least some of which are coated with coating material, wherein: the magnetic particles include nanocrystals; the dust core has a first surface, a second surface and a peripheral surface; the first surface faces in a first orientation of a predetermined direction; the second surface faces in a second orientation opposite to the first orientation; the peripheral surface intersects with a perpendicular direction perpendicular to the predetermined direction; and max(C1, C2, C)−min(C1, C2, C)≥1, where, C1 is a degree of crystallinity of the first surface, C2 is a degree of crystallinity of the second surface, and C is a degree of crystallinity of the peripheral surface. 2 . The dust core as recited in claim 1 , wherein max(C1, C2, C)=C.
Assignees
Inventors
Classifications
the particles being insulated · CPC title
Amorphous metallic alloys, e.g. glassy metals {(making ferrous amorphous alloys C22C33/003)} · CPC title
using polymers · CPC title
made from powder (powder coatings on sheets H01F3/02; on strips or ribbons H01F3/04; on wires H01F3/06) · CPC title
containing nanocrystallites, e.g. obtained by annealing · CPC title
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Frequently asked questions
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- What does patent US12567538B2 cover?
- A dust core is manufactured by compacting magnetic particles in a metal die while heating the magnetic particles at a predetermined temperature in the metal die. At least some of the magnetic particles are coated with coating material. The metal die comprises a die, an upper punch and a lower punch. The upper punch is positioned above the lower punch in an up-down direction. The metal die is pr…
- Who is the assignee on this patent?
- Tokin Corp
- What technology area does this patent fall under?
- Primary CPC classification H01F41/0246. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 03 2026 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).