公开(公告)号：US12215410B2

公开(公告)日：2025-02-04

申请号：US17422517

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro Tanaka ,  Takashi Kataoka ,  Kazutoshi Takeda ,  Tomoya Suenaga ,  Yuki Kunita

IPC: C22C38/06 ,  C21D3/04 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  H01F1/147

Abstract: A grain oriented electrical steel sheet includes a base steel sheet, an oxide layer, and a tension-insulation coating. When the iron oxide layer is analyzed by a fourier transform infrared spectroscopy, an absorbance A650 at 650 cm−1 and an absorbance A1250 at 1250 cm−1 satisfy 0.2≤A650/A1250≤5.0. Moreover, a magnetic flux density B8 in a rolling direction of the grain oriented electrical steel sheet is 1.90 T or more.

公开(公告)号：US12031191B2

公开(公告)日：2024-07-09

申请号：US17415816

申请日：2019-12-24

Applicant: NIPPON STEEL CORPORATION

Inventor： Satoshi Arai ,  Hideyuki Hamamura ,  Kazutoshi Takeda ,  Takeo Aramaki ,  Hirotoshi Tada

IPC: H01F1/147 ,  C21D3/04 ,  C21D8/00 ,  C21D8/12 ,  C21D9/46 ,  C23C22/07 ,  C23C22/82

CPC classification number: C21D9/46 ,  C21D3/04 ,  C21D8/005 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1288 ,  C23C22/07 ,  C23C22/82 ,  H01F1/147

Abstract: This grain-oriented electrical steel sheet includes a base steel sheet, a forsterite-based primary film disposed on a surface of the base steel sheet, and a phosphate-based tension-imparting film containing no chromium, which is disposed on a surface of the primary film. In a case where a Ti content and a S content are respectively expressed as XTi and XS, by mass %, the forsterite-based primary film satisfies Expression (1) and Expression (2). A strain-introduced magnetic domain control is performed on the grain-oriented electrical steel sheet

0.10≤XTi/XS≤10.00  Expression (1)

XTi+XS≥0.10 mass %.  Expression (2)

公开(公告)号：US12005487B2

公开(公告)日：2024-06-11

申请号：US17800851

申请日：2021-06-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro Tanaka ,  Kazutoshi Takeda ,  Minako Fukuchi ,  Shinsuke Takatani ,  Shuichi Yamazaki

IPC: B21D28/14 ,  H01F41/02 ,  H02K15/02

CPC classification number: B21D28/14 ,  H01F41/02 ,  H02K15/02 ,  H02K15/024

Abstract: Provided is a method of manufacturing a laminated core by punching electrical steel strips including an insulation coating to obtain core single sheets and laminating the core single sheets, the method including: pressurizing two or more electrical steel strips using a guide roller to temporarily bond the electrical steel strips immediately before the punching; and obtaining the core single sheets by performing the punching after inserting the two or more electrical steel strips after the temporary bonding into a punching die.

公开(公告)号：US11979059B2

公开(公告)日：2024-05-07

申请号：US17299886

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Yasuo Ohsugi ,  Ryu Hirayama ,  Kazutoshi Takeda

IPC: H02K1/18 ,  C09J133/08 ,  H02K1/12 ,  H02K1/14

CPC classification number: H02K1/185 ,  C09J133/08 ,  H02K1/12 ,  H02K1/146 ,  H02K1/18

Abstract: A laminated core includes a plurality of electrical steel sheets stacked in a thickness direction, each of the electrical steel sheets includes an annular core back part; a plurality of fastening parts are provided in the core back part at intervals in a circumferential direction; an adhesion region is formed on an outer circumferential side from the fastening parts in the core back part; and a non-adhesion region is formed on an inner circumferential side from the fastening parts in the core back part.

公开(公告)号：US11710990B2

公开(公告)日：2023-07-25

申请号：US17413121

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Yasuo Ohsugi ,  Ryu Hirayama ,  Kazutoshi Takeda

IPC: H02K1/12

CPC classification number: H02K1/12

Abstract: A laminated core includes a plurality of electrical steel sheets stacked in a thickness direction, the electrical steel sheet includes an annular core back part and a plurality of tooth parts that protrude from the core back part in a radial direction and are disposed at intervals in a circumferential direction of the core back part, a fastening part is provided in a portion of the core back part corresponding to the tooth part, and an adhesion part is provided in the tooth part.

公开(公告)号：US12266971B2

公开(公告)日：2025-04-01

申请号：US17299226

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi Takeda ,  Hiroyasu Fujii ,  Shinsuke Takatani

IPC: H02K1/16 ,  H02K15/02

Abstract: Provided is an electric motor which includes an adhesively-laminated core for a stator having excellent productivity and high mechanical strength and that is thus capable of reducing vibration and noise of an electric motor and suppressing iron loss. The adhesively-laminated core for a stator includes electrical steel sheets laminated on each other and each coated on both sides with an insulation coating, and an adhesion part disposed between the electrical steel sheets adjacent to each other in a stacking direction and configured to cause the electrical steel sheets to be adhered to each other. All sets of the electrical steel sheets adjacent to each other in the stacking direction are adhered by the adhesion part, an adhesive forming the adhesion part includes a fast-curing type adhesive and a thermosetting adhesive, and the adhesion part is partially provided between the electrical steel sheets adjacent to each other in the stacking direction.

公开(公告)号：US12215399B2

公开(公告)日：2025-02-04

申请号：US17440646

申请日：2020-04-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyasu Fujii ,  Jun Maki ,  Kazutoshi Takeda ,  Hiroyuki Mimura ,  Yusuke Kanto ,  Shuichi Yamazaki

IPC: C21D8/12 ,  H01F1/18

Abstract: A non-oriented electrical steel sheet according to one embodiment of this invention includes a base metal steel sheet and a composite coating film composed of a Zn-containing phosphate and an organic resin, the composite coating film being formed on a surface of the base metal steel sheet. A molar ratio of Zn to all metal components in the composite coating film is 10 mol % or more, and after the non-oriented electrical steel sheet is boiled for 20 minutes in boiled distilled water, an amount of soluble Zn in the distilled water is 1.0 mg/m2 or more. The method for determining the amount of soluble Zn is in accordance with JIS K 0102: 2016 “Testing Methods for Industrial Wastewater”, 53.3 “ICP Emission Spectroscopy”.

公开(公告)号：US12084750B2

公开(公告)日：2024-09-10

申请号：US18277548

申请日：2022-03-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi Takeda ,  Minako Fukuchi ,  Shinsuke Takatani

IPC: C22C38/02 ,  B05D3/02 ,  B05D7/14 ,  C21D8/12 ,  C22C38/04 ,  C22C38/06 ,  C23C22/12 ,  C23C22/20

CPC classification number: C22C38/02 ,  B05D3/0254 ,  B05D7/14 ,  C21D8/1283 ,  C22C38/04 ,  C22C38/06 ,  C23C22/20 ,  B05D2202/10

Abstract: This non-oriented electrical steel sheet includes: a base steel sheet; and an insulation coating formed on a surface of the base steel sheet, in which the insulation coating contains a metal phosphate and an organic resin, a moisture content of the insulation coating is 0.003 to 0.03 wt %, and a contact angle of water on the insulation coating is 55° to 85°.

公开(公告)号：US11866812B2

公开(公告)日：2024-01-09

申请号：US17427535

申请日：2020-02-07

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro Tanaka ,  Takashi Kataoka ,  Kazutoshi Takeda ,  Masamitsu Kubota ,  Hirotoshi Tada

IPC: C22C38/20 ,  C22C38/34 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C21D9/46 ,  C21D8/02 ,  C21D3/04 ,  C23G1/08 ,  C22C38/60

CPC classification number: C22C38/20 ,  C21D3/04 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/04 ,  C22C38/06 ,  C22C38/34 ,  C22C38/60 ,  C23G1/081 ,  C21D2201/05

Abstract: A grain oriented electrical steel sheet includes a base steel sheet, an oxide layer, and a tension-insulation coating. When a glow discharge spectroscopy is conducted in a region from a surface of the tension-insulation coating to an inside of the base steel sheet, a sputtering time Fe0.5 at which a Fe emission intensity becomes 0.5 times as compared with a saturation value thereof and a sputtering time Fe0.05 at which a Fe emission intensity becomes 0.05 times as compared with the saturation value satisfy (Fe0.5−Fe0.05)/Fe0.5≥0.35. A maximal point of a Cr emission intensity is included between the Fe0.05 and the Fesat. Moreover, a magnetic flux density B8 in a rolling direction of the grain oriented electrical steel sheet is 1.90 T or more.

公开(公告)号：US11863017B2

公开(公告)日：2024-01-02

申请号：US17293795

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Masahito Kamikawabata ,  Ryu Hirayama ,  Kazutoshi Takeda

IPC: H02K1/18 ,  H02K1/02

CPC classification number: H02K1/185 ,  H02K1/02 ,  H02K2213/03

Abstract: A laminated core includes a plurality of electrical steel sheets stacked on each other, and an adhesion part provided between electrical steel sheets adjacent to each other in a stacking direction and configured to adhere the electrical steel sheets to each other, wherein the adhesion part partially adheres the electrical steel sheets adjacent to each other in the stacking direction, and the adhesion parts adjacent to each other in the stacking direction have different arrangement regions in a plan view seen in the stacking direction.