公开(公告)号：US20220037939A1

公开(公告)日：2022-02-03

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：US20210381072A1

公开(公告)日：2021-12-09

申请号：US17283208

申请日：2019-10-02

Applicant: NIPPON STEEL CORPORATION

Inventor： Shuichi YAMAZAKI ,  Shinsuke TAKATANI ,  Hiroyasu FUJII ,  Kazutoshi TAKEDA

IPC: C21D8/12 ,  C21D9/46 ,  H01F1/153 ,  H01F1/147 ,  C23C22/50 ,  C23C22/76 ,  C23C22/78

Abstract: [Problem] To provide: a coating liquid for forming an insulation coating for grain-oriented electrical steel sheets, which enables the achievement of excellent coating properties including high coating tension and excellent corrosion resistance even without using a chromium compound; a grain-oriented electrical steel sheet; and a method for producing a grain-oriented electrical steel sheet. [Solution] A coating liquid for forming an insulation coating for grain-oriented electrical steel sheets, which contains boric acid and hydrated silicate particles containing aluminum.

公开(公告)号：US20210317542A1

公开(公告)日：2021-10-14

申请号：US17256891

申请日：2018-07-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Shuichi NAKAMURA ,  Seiki TAKEBAYASHI ,  Yoshiyuki USHIGAMI ,  Shinsuke TAKATANI ,  Hiroyasu FUJII

IPC: C21D9/46 ,  C23C8/02 ,  C21D8/12 ,  C23C8/18 ,  C22C38/02 ,  C22C38/00

Abstract: In a base sheet for a grain-oriented electrical steel sheet of the present invention, an amount of surface oxygen x per one surface of the base sheet and a value y of a peak (ΔR/R0 @1250 cm−1) of SiO2 on the surface of the base sheet obtained by infrared reflection spectroscopy satisfy y≥1500x2.5 and y≥0.24. A method of manufacturing the base sheet for a grain-oriented electrical steel sheet of the present invention includes: adjusting the amount of surface oxygen per one surface of a final-annealed grain-oriented silicon steel sheet to more than 0.01 g/m2 and 0.05 g/m2 or less, or more than 0.05 g/m2 and 0.10 g/m2 or less; and performing thermal oxidation annealing in an atmosphere in which an oxidation potential represented by a ratio PH2O/PH2 of water vapor pressure to hydrogen pressure is 0.0081 or less in a case where the amount of surface oxygen is more than 0.01 g/m2 and 0.05 g/m2 or less, or in an atmosphere in which the oxidation potential is 0.005 or less in a case where the amount of surface oxygen is more than 0.05 g/m2 and 0.10 g/m2 or less, at a soaking temperature of 1000° C. or lower to form an externally oxidized layer on a surface of the grain-oriented silicon steel sheet.

公开(公告)号：US20250109452A1

公开(公告)日：2025-04-03

申请号：US18978989

申请日：2024-12-12

Applicant: NIPPON STEEL CORPORATION

Inventor： Shuichi YAMAZAKI ,  Shinsuke TAKATANI ,  Hiroyasu FUJII ,  Kazutoshi TAKEDA

IPC: C21D8/12 ,  C21D9/46 ,  C23C22/50 ,  C23C22/76 ,  C23C22/78 ,  H01F1/147 ,  H01F1/153

Abstract: A coating liquid for forming an insulation coating for grain-oriented electrical steel sheets, which contains boric acid and hydrated silicate particles containing aluminum, a method for producing a grain-oriented electrical steel sheet comprising applying the coating liquid to a grain-oriented electrical steel sheet after final annealing, and then performing a baking treatment, and a grain-oriented electrical steel sheet.

公开(公告)号：US20240379265A1

公开(公告)日：2024-11-14

申请号：US18688684

申请日：2022-09-02

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Minako FUKUCHI ,  Yoshiaki NATORI ,  Hiroyasu FUJII ,  Shinsuke TAKATANI

IPC: H01F1/147 ,  C21D6/00 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

Abstract: A non-oriented electrical steel sheet 1 of the present embodiment is provided with a base metal steel sheet 10 and an insulating coating film 20 formed on the surface of the base metal steel sheet 10. The insulating coating film 20 contains metal phosphate, organic resin, and nitrite. The insulating coating film 20 has a nitrogen content of 0.05-5.00% by mass.

公开(公告)号：US20240183012A1

公开(公告)日：2024-06-06

申请号：US18285451

申请日：2022-04-06

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Takashi KATAOKA ,  Shinsuke TAKATANI ,  Yuuki KOGAKURA ,  Yuki KUNITA

IPC: C22C38/02 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06

CPC classification number: C22C38/02 ,  C21D6/008 ,  C21D8/1272 ,  C21D8/1283 ,  C21D8/1288 ,  C22C38/001 ,  C22C38/004 ,  C22C38/04 ,  C22C38/06 ,  C21D2201/05

Abstract: This grain-oriented electrical steel sheet includes: a base steel sheet; and an insulating coating formed on a surface of the base steel sheet, in which the insulating coating includes an intermediate layer formed on a base steel sheet side and containing a crystalline metal phosphate, and a tension coating layer formed on a surface side of the insulating coating, an average thickness of the intermediate layer is 0.3 to 10.0 μm, an average thickness of the insulating coating is 2.0 to 10.0 μm, the crystalline metal phosphate of the intermediate layer is one or two or more of zinc phosphate, manganese phosphate, iron phosphate, and zinc calcium phosphate, the tension coating layer contains a metal phosphate and silica, and an amount of the silica in the tension coating layer is 20 to 60 mass %.

公开(公告)号：US20230257622A1

公开(公告)日：2023-08-17

申请号：US18010555

申请日：2021-06-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Shinsuke TAKATANI ,  Minako FUKUCHI ,  Ichiro TANAKA

IPC: C09D163/00 ,  C09D5/00 ,  H01F1/18 ,  H02K1/02 ,  H02K1/06 ,  B32B15/18 ,  B32B15/04 ,  B32B7/12

CPC classification number: C09D163/00 ,  C09D5/00 ,  H01F1/18 ,  H02K1/02 ,  H02K1/06 ,  B32B15/18 ,  B32B15/043 ,  B32B7/12 ,  B32B2255/06 ,  B32B2255/26 ,  B32B2603/00

Abstract: An electrical steel sheet used for a laminated core is an electrical steel sheet including an insulation coating 3 on a surface of a base steel sheet 2, the insulation coating being coated with a coating composition for an electrical steel sheet. The coating composition for an electrical steel sheet contains an epoxy resin, a first curing agent including an alkylphenol, and a second curing agent including either one or both of a phenol resol resin and a phenol novolac resin formulated in specific proportions.

公开(公告)号：US20230257621A1

公开(公告)日：2023-08-17

申请号：US18009889

申请日：2021-06-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Shinsuke TAKATANI ,  Minako FUKUCHI ,  Ichiro TANAKA

IPC: C09D163/00 ,  C09D5/23 ,  C09D5/18

CPC classification number: C09D163/00 ,  C09D5/18 ,  C09D5/23

Abstract: A coating composition for an electrical steel sheet including an epoxy resin, an epoxy resin by latent curing agent, and a thermoplastic elastomer, wherein the thermoplastic elastomer has a melting point of 100° C. or higher and 200° C. or lower and a bending elastic modulus of more than 5 MPa and 100 MPa or less, and wherein the amount of the thermoplastic elastomer with respect to a total amount of 100 parts by mass of the epoxy resin and the epoxy resin by latent curing agent is 10 parts by mass or more and less than 40 parts by mass.

公开(公告)号：US20230080376A1

公开(公告)日：2023-03-16

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 ,  H02K15/02 ,  H01F41/02

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：US20220081746A1

公开(公告)日：2022-03-17

申请号：US17421771

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinsuke TAKATANI ,  Yoshiyuki USHIGAMI

IPC: C22C38/54 ,  C22C38/00 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/46 ,  C22C38/50 ,  C21D9/46 ,  C21D8/02

Abstract: A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled and pickling is conducted after decreasing temperature, an annealing separator applying process where a mass ratio of MgO and Al2O3 in an annealing separator is controlled, a final annealing process where an oxidation degree is controlled when atmosphere includes hydrogen or a dew point is controlled when atmosphere consists of inert gas, an annealing separator removing process where water-washing is conducted using solution with inhibitor, and an insulation coating forming process where a mass ratio of phosphoric acid and metal compound in insulation coating forming solution is controlled.