公开(公告)号：US20210350962A1

公开(公告)日：2021-11-11

申请号：US17379666

申请日：2021-07-19

Applicant: Alps Alpine Co., Ltd.

Inventor： Akio HANADA ,  Koichi FUJITA ,  Seiichi ABIKO ,  Hisato KOSHIBA

IPC: H01F1/153 ,  H01F41/02 ,  H01F27/255 ,  C22C45/02 ,  B22F3/02 ,  B22F3/24

Abstract: A powder magnetic core containing a magnetic particle of an Fe-based Cr-containing amorphous alloy and an organic binding substance is provided as a powder magnetic core with a small loss and high initial permeability. The depth profile of the composition determined from the surface of the magnetic particle in the powder magnetic core has the following characteristics. (1) An oxygen-containing region with an O/Fe ratio of 0.1 or more can be defined from the surface of the magnetic particle, and the oxygen-containing region has a depth of 35 nm or less from the surface. (2) A carbon-containing region with a C/O ratio of 1 or more can be defined from the surface of the magnetic particle, and the carbon-containing region has a depth of 5 nm or less from the surface. (3) The oxygen-containing region has a Cr-concentrated portion with a bulk Cr ratio of more than 1.

公开(公告)号：US20230207179A1

公开(公告)日：2023-06-29

申请号：US18172542

申请日：2023-02-22

Applicant: Alps Alpine Co., Ltd.

Inventor： Shokan YAMASHITA ,  Akio HANADA ,  Munemitsu ABE

IPC: H01F27/25 ,  H01F1/153 ,  H02K1/02

CPC classification number: H01F27/25 ,  H01F1/15333 ,  H02K1/02

Abstract: In a magnetic core including a core assembly having a structure that multiple thin strip blocks are arranged, the thin strip blocks being formed of multiple laminates of nanocrystalline thin strips made of a nanocrystal-containing alloy material, the thin strip block includes a fixedly joined portion in which the nanocrystalline thin strips adjacent to each other in a lamination direction are fixedly joined together. The fixedly joined portion may include side surfaces of the nanocrystalline thin strips and may be a laser welded portion.

公开(公告)号：US20230208219A1

公开(公告)日：2023-06-29

申请号：US18172550

申请日：2023-02-22

Applicant: Alps Alpine Co, Ltd.

Inventor： Munemitsu ABE ,  Akio HANADA ,  Shokan YAMASHITA ,  Tatsuya OBA

IPC: H02K1/22 ,  H02K1/12 ,  H02K15/02

CPC classification number: H02K1/22 ,  H02K1/12 ,  H02K15/02

Abstract: In a magnetic core including a core assembly formed of multiple arranged thin strip blocks, each of the thin strip blocks has a structure that multiple nanocrystalline thin strips having a bcc-Fe phase as a main phase are laminated one above another, and an iron loss in the nanocrystalline thin strip positioned at a center of the thin strip block in a thickness direction thereof is lower than an iron loss in the nanocrystalline thin strip positioned in a surface layer of the thin strip block. The nanocrystalline thin strip may be a heat-treated product of an amorphous thin strip made of an amorphous alloy material, and the thin strip block may include a fixedly joined portion in which the nanocrystalline thin strips adjacent to each other in a lamination direction are fixedly joined together.

公开(公告)号：US20230208213A1

公开(公告)日：2023-06-29

申请号：US18172883

申请日：2023-02-22

Applicant: Alps Alpine Co., Ltd.

Inventor： Munemitsu ABE ,  Akio HANADA ,  Shokan YAMASHITA ,  Tatsuya OBA

IPC: H02K1/02 ,  H02K15/02 ,  B23K26/21

CPC classification number: H02K1/02 ,  H02K15/02 ,  B23K26/21 ,  B23K2101/36

Abstract: In a magnetic core including a laminated core in which multiple core thin strips are laminated, the magnetic core includes a cutting mark region formed by cutting tie sticks 212, connected to the core thin strips 511, in a lamination direction of the core thin strips 511, and the cutting mark region 51C is positioned on an inner side than outer peripheries of the core thin strips 511. The core thin strip 511 may include a portion made of a nanocrystal-containing alloy material that is obtained by nano-crystallizing an amorphous alloy material with heat treatment.