公开(公告)号：US11749431B2

公开(公告)日：2023-09-05

申请号：US17795432

申请日：2021-06-17

Applicant: NIPPON STEEL CORPORATION

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

IPC: H01F1/18 ,  H01F41/02 ,  B32B15/01

CPC classification number: H01F1/18 ,  B32B15/011 ,  H01F41/0206

Abstract: This electrical steel sheet includes a base steel sheet, a first insulation coating formed on a first surface of the base steel sheet and having adhesiveness, and a second insulation coating formed on a second surface of the base steel sheet which is a back surface to the first surface and having adhesiveness, in which an average pencil hardness of the first insulation coating is HB or higher and 3 H or lower, and an average pencil hardness of the second insulation coating is higher than the average pencil hardness of the first insulation coating.

公开(公告)号：US11603575B2

公开(公告)日：2023-03-14

申请号：US16979110

申请日：2019-03-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Takashi Kataoka ,  Nobusato Morishige ,  Haruhiko Atsumi ,  Kazutoshi Takeda ,  Shin Furutaku ,  Hirotoshi Tada ,  Ryosuke Tomioka

IPC: C21D9/46 ,  C21D8/12 ,  C21D6/00 ,  C22C38/34 ,  C22C38/20 ,  C22C38/04 ,  C22C38/00 ,  C22C38/06

Abstract: A grain-oriented electrical steel sheet includes: a silicon steel sheet including Si and Mn; a glass film arranged on a surface of the silicon steel sheet; and an insulation coating arranged on a surface of the glass film, wherein the glass film includes a Mn-containing oxide.

公开(公告)号：US11499055B2

公开(公告)日：2022-11-15

申请号：US16760254

申请日：2018-11-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Shuichi Yamazaki ,  Hiroyasu Fujii ,  Kazutoshi Takeda

IPC: C09D1/02 ,  C23C24/00 ,  H01F1/18 ,  H01F41/32 ,  C09D7/40 ,  C09D5/00 ,  C09D7/61

Abstract: A coating solution for forming an insulating film for a grain-oriented electrical steel sheet which contains one or more types of hydrous silicate powders having an average particle size of 2 μm or less, and one or more types of phosphoric acids and phosphates satisfying a relation of ΣniMi/ΣPi≤0.5, and satisfies (Formula 1). 1.5≤(ΣniMi+Σn′jM′j)/ΣPi≤15  (Formula 1) (P represents the number of moles of phosphorus, M represents the number of moles of metal ions derived from the phosphate, n represents the valence of the metal ions derived from the phosphate, i represents the number of types of phosphates, M′ represents the number of moles of metal elements in the hydrous silicate, n′ represents the valence of the metal elements in the hydrous silicate, and j represents the number of types of hydrous silicates).

公开(公告)号：US12261482B2

公开(公告)日：2025-03-25

申请号：US17294202

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Ryu Hirayama ,  Kazutoshi Takeda

IPC: H02K1/16 ,  H01F27/245 ,  H02K1/14 ,  H02K15/02

Abstract: A laminated core including a plurality of electrical steel sheets stacked on each other, and adhesion parts which are provided between the electrical steel sheets adjacent to each other in an axial direction thereof and adhering the electrical steel sheets to each other, in which each of the electrical steel sheets includes an annular core back part, and a plurality of tooth parts which extend from the core back part in a radial direction of the core back part and are disposed at intervals in a circumferential direction of the core back part, and each of the tooth parts of the electrical steel sheets has an adhesion region provided with the adhesion part having a belt shape extending in the circumferential direction.

公开(公告)号：US12173377B2

公开(公告)日：2024-12-24

申请号：US17421845

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

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

IPC: C21D9/46 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  C23C22/18 ,  C23C22/20 ,  C23C22/74 ,  C23C28/04 ,  C23G1/08

Abstract: The grain-oriented electrical steel sheet is a grain-oriented electrical steel sheet which does not have an inorganic coating containing forsterite as a main component, including a base steel sheet having a predetermined chemical component, a silicon-containing oxide layer provided on the base steel sheet, an iron-based oxide layer provided on the silicon-containing oxide layer, and a tension-insulation coating provided on the iron-based oxide layer, having a thickness of 1 to 3 μm, and containing phosphate and colloidal silica as main components. When elemental analysis is performed from a surface of the tension-insulation coating in a sheet thickness direction by glow discharge optical emission spectrometry, predetermined requirements are satisfied.

公开(公告)号：US12154711B2

公开(公告)日：2024-11-26

申请号：US17294519

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi Takeda ,  Ryu Hirayama

IPC: H01F27/245 ,  H01F41/02 ,  H02K1/18 ,  H02K15/02

Abstract: Provided is an adhesively-laminated core for a stator including: a plurality of electrical steel sheets which have phosphate-based insulation coatings on surfaces thereof and are overlapped coaxially with each other; and adhesion parts provided between the respective electrical steel sheets, an average thickness of the insulation coatings is 0.3 μm to 1.2 μm, an average thickness of the adhesion parts is 1.0 μm to 3.0 μm, and in a case where the average thickness of the insulation coating is defined as t1 in a unit of μm, and the average thickness of the adhesion parts is defined as t2 in a unit of μm, the following Equation 1 is satisfied. −4.3×t1+3.6≤t2≤−4.3×t1+6.9  (Equation 1)

公开(公告)号：US12148555B2

公开(公告)日：2024-11-19

申请号：US17259837

申请日：2019-11-01

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyoshi Yashiki ,  Yoshiaki Natori ,  Miho Tomita ,  Kazutoshi Takeda ,  Takuya Matsumoto

IPC: H01F1/147 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/60

Abstract: This non-oriented electrical steel sheet includes a base metal having a predetermined chemical composition satisfying the expression [Si+sol. Al+0.5×Mn≥4.3], and an average grain size of the base metal is more than 40 μm and 120 μm or less.

公开(公告)号：US12037511B2

公开(公告)日：2024-07-16

申请号：US17923531

申请日：2021-06-17

Applicant: NIPPON STEEL CORPORATION

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

IPC: C09D163/00 ,  C09D7/40 ,  C09D7/61

CPC classification number: C09D163/00 ,  C09D7/61 ,  C09D7/66

Abstract: This coating composition for an electrical steel sheet is a coating composition for an electrical steel sheet containing an epoxy resin, a high-temperature curing agent, and inorganic fine particles, wherein a content of the high-temperature curing agent with respect to 100 parts by mass of the epoxy resin is 5 to 30 parts by mass, wherein the inorganic fine particles are one or more selected from metal hydroxides, metal oxides that react with water at 25° C. to become metal hydroxides and silicate minerals having a hydroxyl group, wherein the volume average particle diameter of the inorganic fine particles is 0.05 to 2.0 μm, wherein a content of the epoxy resin with respect to a total mass of the coating composition for an electrical steel sheet is 45 mass % or more, and wherein a content of the inorganic fine particles with respect to 100 parts by mass of the epoxy resin is 1 to 100 parts by mass.

公开(公告)号：US12033776B2

公开(公告)日：2024-07-09

申请号：US18276857

申请日：2022-03-30

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 ,  C23C22/03

CPC classification number: H01F1/14783 ,  C21D6/005 ,  C21D6/008 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C22/03 ,  C22C2202/02

Abstract: This non-oriented electrical steel sheet includes a base steel sheet (10); and an insulation coating (20) formed on a surface of the base steel sheet (10), in which the insulation coating (20) contains a metal phosphate and an organic resin, an arithmetic mean of a center line average roughness Ra75 of the insulation coating (20) in a rolling direction of the base steel sheet (10) and a center line average roughness Ra75 of the insulation coating (20) in a direction perpendicular to the rolling direction is 0.20 to 0.50 μm, and the amount of nitrogen in the insulation coating (20) is 0.05 to 5.00 mass %.

公开(公告)号：US11990795B2

公开(公告)日：2024-05-21

申请号：US17413556

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi Takeda ,  Hiroyasu Fujii ,  Shinsuke Takatani

IPC: H02K1/18 ,  C09J163/00 ,  H01F27/245

CPC classification number: H02K1/185 ,  C09J163/00 ,  H01F27/245

Abstract: An adhesively-laminated core for a stator capable of suppressing an iron loss of an electric motor and also having excellent productivity is provided. The adhesively-laminated core for a stator includes a plurality of electrical steel sheets which are stacked on one another and of which both surfaces are coated with insulation coatings, and adhesion parts which are disposed between the electrical steel sheets adjacent to each other in a stacking direction and 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 via the adhesion parts. An adhesive forming the adhesion parts is a two-agent type acrylic-based adhesive (SGA) which includes an acrylic-based compound, an oxidizer, and a reducer and in which a portion of the acrylic-based compound and the oxidizer are assigned to a first agent and the remaining portion of the acrylic-based compound and the reducer are assigned to a second agent. The adhesion parts are partially provided between the electrical steel sheets adjacent to each other in the stacking direction.