公开(公告)号：US20230290551A1

公开(公告)日：2023-09-14

申请号：US18019518

申请日：2021-05-11

Applicant: Hitachi, Ltd.

Inventor： Matahiro KOMURO ,  Yusuke ASARI ,  Kazuya SHINAGAWA ,  Shinya TAMURA ,  Tomohiro TABATA ,  Shohei TERADA

IPC: H01F1/16 ,  H02K1/02 ,  C21D3/08 ,  C21D1/76 ,  C21D1/18 ,  C21D9/46 ,  C22C38/00 ,  C22C38/10 ,  C22C38/12 ,  C21D6/00

CPC classification number: H01F1/16 ,  H02K1/02 ,  C21D3/08 ,  C21D1/76 ,  C21D1/18 ,  C21D9/46 ,  C22C38/001 ,  C22C38/10 ,  C22C38/12 ,  C21D6/007 ,  C21D2211/001 ,  C22C2202/02

Abstract: The present invention provides a soft magnetic iron sheet exhibiting a high saturation magnetic flux density and a low iron loss as compared with an electromagnetic pure iron sheet, a method for producing the soft magnetic iron sheet, and, an iron core and a dynamo-electric machine, each using the soft magnetic iron sheet. The soft magnetic iron sheet according to the present invention includes: iron as a main component; and nitrogen, in which the soft magnetic iron sheet includes, along a thickness direction of the soft magnetic iron sheet: a high nitrogen concentration layer having a nitrogen concentration of 2 at. % to 11 at. %; a low nitrogen concentration layer having a nitrogen concentration of half or less of the nitrogen concentration of the high nitrogen concentration layer; and a nitrogen concentration transition layer connecting the nitrogen concentration of the high nitrogen concentration layer and the nitrogen concentration of the low nitrogen concentration layer, and wherein a surface layer region including at least both main surfaces of the soft magnetic iron sheet is the low nitrogen concentration layer.

公开(公告)号：US20220328225A1

公开(公告)日：2022-10-13

申请号：US17779158

申请日：2020-08-28

Applicant: Hitachi, Ltd.

Inventor： Matahiro KOMURO ,  Shohei TERADA ,  Yusuke ASARI

IPC: H01F1/16 ,  H01F1/147 ,  H02K1/02 ,  C23C8/26

Abstract: The present invention aims at providing an iron-nitrogen-based soft magnetic steel sheet having a saturation magnetic flux density higher than that of pure iron, a method for manufacturing the soft magnetic steel sheet, and a core and a dynamo-electric machine in which the soft magnetic steel sheet is used. The soft magnetic steel sheet according to the present invention includes C, N, and the balance of Fe and inevitable impurities and is comprised of an α phase, an α′ phase, an α″ phase, and a γ phase. The α phase serves as a main phase, a volume ratio of the α″ phase is 10% or more, and a volume ratio of the γ phase is 5% or less. The core according to the present invention includes a laminated body of the soft magnetic steel sheets.

公开(公告)号：US20240233993A9

公开(公告)日：2024-07-11

申请号：US18278477

申请日：2021-09-28

Applicant: Hitachi, Ltd.

Inventor： Tomohiro TABATA ,  Matahiro KOMURO ,  Yusuke ASARI ,  Shinya TAMURA ,  Shohei TERADA

IPC: H01F1/16 ,  C21D9/46 ,  C22C38/00 ,  C22C38/10 ,  C22C38/12

CPC classification number: H01F1/16 ,  C21D9/46 ,  C22C38/001 ,  C22C38/10 ,  C22C38/12 ,  C21D2211/005 ,  C22C2202/02

Abstract: A soft magnetic iron alloy sheet has a saturation magnetic flux density comparable to that of Permendur, with the same iron loss as electromagnetic pure iron, and a lower cost than Permendur. The soft magnetic iron alloy sheet includes, as a chemical composition, 30 at % or less of Co, 0.1 at % or more and 11 at % or less of N, and 1.2 at % or less of vanadium, with the remainder being Fe and impurities. In a thickness direction of the soft magnetic iron alloy sheet, a surface layer region has an average nitrogen concentration of 1 at % or more and 15 at % or less and an internal region has a lower average nitrogen concentration than the surface layer region. In the surface layer region, a thickness is 1% or more and 30% or less from both main surfaces of the sheet and iron-nitride martensite having a tetragonal structure is formed.

公开(公告)号：US20240194383A1

公开(公告)日：2024-06-13

申请号：US18286240

申请日：2022-02-18

Applicant: Hitachi, Ltd.

Inventor： Matahiro KOMURO ,  Tomohiro TABATA ,  Shinya TAMURA ,  Yusuke ASARI ,  Shohei TERADA

IPC: H01F1/20 ,  C21D1/18 ,  C21D1/76 ,  C21D3/08 ,  C21D6/00 ,  C21D6/04 ,  C21D9/46 ,  C22C38/00 ,  C22C38/10

CPC classification number: H01F1/20 ,  C21D1/18 ,  C21D1/76 ,  C21D3/08 ,  C21D6/007 ,  C21D6/04 ,  C21D9/46 ,  C22C38/001 ,  C22C38/10 ,  C21D2211/008 ,  C22C2202/02

Abstract: A soft magnetic iron alloy plate having saturation magnetic flux density higher than that of an electromagnetic pure iron plate without an excessive increase in an iron loss, a method for manufacturing the soft magnetic iron alloy plate, and an iron core and a rotating electric machine using the soft magnetic iron alloy plate are provided. A soft magnetic iron alloy plate according to the present invention includes chemical composition containing 2 to 10 at. % of N, 0 to 30 at. % of Co, 0 to 1.2 at. % of V, and a remaining portion including Fe and impurities, and in a thickness direction of the soft magnetic iron alloy plate, an outer nitrogen concentration transition region where N concentration on a main surface is 1 to 4 at. % and N concentration increases toward the inner side from the main surface, a high nitrogen concentration region where maximum N concentration is higher than N concentration of the main surface and less than 11 at. %, and a variation range of N concentration is within 1 at. %, and an inner nitrogen concentration transition region where N concentration decreases toward the inner side from the high nitrogen concentration region and minimum N concentration is lower than N concentration in the high nitrogen concentration region and is 1 at. % or more.

公开(公告)号：US20240136096A1

公开(公告)日：2024-04-25

申请号：US18278477

申请日：2021-09-27

Applicant: Hitachi, Ltd.

Inventor： Tomohiro TABATA ,  Matahiro KOMURO ,  Yusuke ASARI ,  Shinya TAMURA ,  Shohei TERADA

IPC: H01F1/16 ,  C21D9/46 ,  C22C38/00 ,  C22C38/10 ,  C22C38/12

CPC classification number: H01F1/16 ,  C21D9/46 ,  C22C38/001 ,  C22C38/10 ,  C22C38/12 ,  C21D2211/005 ,  C22C2202/02

Abstract: A soft magnetic iron alloy sheet has a saturation magnetic flux density comparable to that of Permendur, with the same iron loss as electromagnetic pure iron, and a lower cost than Permendur. The soft magnetic iron alloy sheet includes, as a chemical composition, 30 at % or less of Co, 0.1 at % or more and 11 at % or less of N, and 1.2 at % or less of vanadium, with the remainder being Fe and impurities. In a thickness direction of the soft magnetic iron alloy sheet, a surface layer region has an average nitrogen concentration of 1 at % or more and 15 at % or less and an internal region has a lower average nitrogen concentration than the surface layer region. In the surface layer region, a thickness is 1% or more and 30% or less from both main surfaces of the sheet and iron-nitride martensite having a tetragonal structure is formed.

公开(公告)号：US20230287546A1

公开(公告)日：2023-09-14

申请号：US18019897

申请日：2021-06-01

Applicant: Hitachi, Ltd.

Inventor： Kazuya SHINAGAWA ,  Matahiro KOMURO ,  Yusuke ASARI ,  Shohei TERADA

IPC: C22C38/10 ,  H01F1/20 ,  H02K1/02 ,  B22F1/142 ,  B22F1/054

CPC classification number: C22C38/105 ,  H01F1/20 ,  H02K1/02 ,  B22F1/142 ,  B22F1/054 ,  B22F2301/35 ,  B22F2304/054 ,  B22F2302/20 ,  C22C2202/02

Abstract: Provided are a soft magnetic material capable of achieving a high saturation density by reducing Co among soft magnetic materials made of a FeCo-based alloy, a method for producing a soft magnetic material, and an electric motor.
The soft magnetic material of the present invention is a soft magnetic material containing Fe and Co in a total amount of 90 mass % or more, in which: contained components are 50 mass % or more of Fe, 40 mass % or less of Co, 0.1 mass % or less of C, 2.0 mass % or less of Ni, 0.2 mass % or less of Mn, Si, Cr, Ti, Nb, and V, and inevitable impurities; and



the soft magnetic material contains a precipitate of a compound of iron and nitrogen. The precipitate is created by tension annealing a raw material of the soft magnetic material.

公开(公告)号：US20250055329A1

公开(公告)日：2025-02-13

申请号：US18718678

申请日：2022-11-14

Applicant: Hitachi, Ltd.

Inventor： Matahiro KOMURO ,  Tomohiro TABATA ,  Yusuke ASARI ,  Shohei TERADA

IPC: H02K1/02

Abstract: Provided are a laminated iron core that can reduce excessive increase in an iron loss while exhibiting saturation magnetic flux density higher than that of an electromagnetic pure iron plate, and can be made at lower cost than permendur, and a rotating electric machine using the laminated iron core. A laminated iron core according to the present invention is a laminated iron core in which a plurality of types of soft magnetic iron plates are laminated. The plurality of types of the soft magnetic iron plates include a first soft magnetic iron plate and a second soft magnetic iron plate, the first soft magnetic iron plate and the second soft magnetic iron plate are alternately laminated, the first soft magnetic iron plate has higher nitrogen content and higher saturation magnetic flux density than the second soft magnetic iron plate, and the second soft magnetic iron plate has lower coercive force than the first soft magnetic iron plate.

公开(公告)号：US20250037911A1

公开(公告)日：2025-01-30

申请号：US18717102

申请日：2022-11-18

Applicant: Hitachi, Ltd.

Inventor： Tomohiro TABATA ,  Matahiro KOMURO ,  Yusuke ASARI ,  Shohei TERADA

IPC: H01F1/147 ,  C22C38/00 ,  C22C38/24 ,  C22C38/30 ,  H02K1/02

Abstract: Provided are a soft magnetic iron alloy plate that can suppress an excessive increase in Pi while exhibiting Bs higher than that of an electromagnetic pure iron plate and reduce the cost as compared with permendur, an iron core using the soft magnetic iron alloy plate, and a rotating electric machine. The soft magnetic iron alloy plate according to the present invention includes a chemical composition containing Co by 1 to 30 atom %, N by 0.2 to 10 atom %, an M component that can form an MN-type nitride by 0.5 to 5 atom %, with the balance being Fe and impurities, and when a cross section of the soft magnetic iron alloy plate is observed, nitride particles of the M component are deposited with an average particle size of 0.5 μm or less and a number density of 50 particles/100 μm2 or less.

公开(公告)号：US20240186841A1

公开(公告)日：2024-06-06

申请号：US18287723

申请日：2022-04-05

Applicant: Hitachi, Ltd.

Inventor： Yusuke ASARI ,  Tomohiro TABATA ,  Shinya TAMURA ,  Matahiro KOMURO ,  Shohei TERADA

IPC: H02K1/02 ,  H01F1/16 ,  H01F27/245

CPC classification number: H02K1/02 ,  H01F1/16 ,  H01F27/245

Abstract: A magnetic material includes body-centered tetragonal (bct) crystal including iron and nitrogen, in which a molar ratio of iron to nitrogen in the crystal exceeds 8. An iron core includes soft magnetic steel sheets stacked together, in which a part or the entirety of the soft magnetic steel sheets is formed of the magnetic material which includes body-centered tetragonal (bct) crystal including iron and nitrogen and has a molar ratio of iron to nitrogen in the crystal exceeds 8. A rotating electric machine includes an iron core including soft magnetic steel sheets stacked together, in which a part or the entirety of the soft magnetic steel sheets is formed of the magnetic material which includes body-centered tetragonal (bct) crystal including iron and nitrogen and has a molar ratio of iron to nitrogen in the crystal exceeds 8.