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.