公开(公告)号：US20240096531A1

公开(公告)日：2024-03-21

申请号：US18277015

申请日：2022-03-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro TANAKA ,  Takeaki WAKISAKA ,  Tesshu MURAKAWA ,  Yoshiaki NATORI ,  Hiroshi FUJIMURA

IPC: H01F1/147 ,  B32B15/01 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/16 ,  C22C38/20 ,  C22C38/32 ,  C22C38/34 ,  C22C38/60

CPC classification number: H01F1/14791 ,  B32B15/011 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1272 ,  C21D8/1283 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/16 ,  C22C38/20 ,  C22C38/32 ,  C22C38/34 ,  C22C38/60 ,  C22C2202/02

Abstract: There is provided a non-oriented electrical steel sheet having a predetermined chemical composition, in which an area fraction of a crystal structure A composed of crystal grains having a grain size of 100 μm or more is 1% to 30% in a cross section parallel to a rolled plane of the non-oriented electrical steel sheet, an average grain size of a crystal structure B which is a crystal structure other than the crystal structure A is 40 μm or less, and a Vickers hardness HvA of the crystal structure A and a Vickers hardness HvB of the crystal structure B satisfy Equation 1 ((HvA2+HvB2)/2−(HvA+HvB)2/4≤7.0).

公开(公告)号：US20220385119A1

公开(公告)日：2022-12-01

申请号：US17775754

申请日：2020-11-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Masahito KAMIKAWABATA ,  Miho TOMITA ,  Tesshu MURAKAWA

IPC: H02K1/02 ,  C22C38/60 ,  C22C38/16 ,  C22C38/10 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

Abstract: The present invention is a stator core (21) including a plurality of split cores (30), in which the plurality of split cores (30) are configured by laminating core pieces (40) made of an electrical steel sheet, the electrical steel sheet is a predetermined electrical steel sheet, and, in the core pieces (40) of at least one split core (30) in the plurality of split cores (30), the radial directions of teeth (41) and extension directions of core backs (42) are all along a direction in which magnetic characteristics of the electrical steel sheet are excellent.

公开(公告)号：US20220385118A1

公开(公告)日：2022-12-01

申请号：US17775728

申请日：2020-11-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Masahito KAMIKAWABATA ,  Miho TOMITA ,  Tesshu MURAKAWA

IPC: H02K1/02 ,  C22C38/60 ,  C22C38/16 ,  C22C38/10 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/08

Abstract: An electrical steel sheet (300) is formed such that centerlines of four magnetic poles (salient poles) of a rotor core (111) coincide with a direction of easy magnetization (ED1) or (ED2). In addition, the electrical steel sheets (300) are laminated such that the directions of easy magnetization (ED1) and (ED2) are aligned.

公开(公告)号：US20210108296A1

公开(公告)日：2021-04-15

申请号：US16970573

申请日：2019-03-25

Applicant: NIPPON STEEL CORPORATION

Inventor： Tesshu MURAKAWA ,  Hiroshi FUJIMURA ,  Satoshi KANO

IPC: C22C38/42 ,  C22C38/34 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C21D9/46 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  H01F1/147

Abstract: A non-oriented electrical steel sheet includes, as a chemical composition, by mass %: C: 0.0030% or less; Si: 2.00% to 4.00%; Al: 0.01% to 3.00%; Mn: 0.10% to 2.00%; P: 0.005% to 0.200%; S: 0.0030% or less; Cu: more than 1.0% and 3.0% or less; Ni: 0.10% to 3.0%; one or more coarse precipitate forming element: more than 0.0005% and 0.0100% or less in total; a parameter Q (Q=[Si]+2[Al]−[Mn]) where a Si content (mass %) is set as [Si], an Al content (mass %) is set as [Al], and a Mn content (mass %) is set as [Mn]: 2.00 or more; Sn: 0.00% to 0.40%; Cr: 0.0% to 10.0%, and a remainder: Fe and impurities, in which a number of particles of a simple Cu having a diameter of less than 100 nm is 5 or more per 10 μm2, a {100} crystal orientation intensity is 2.4 or more, a thickness is 0.10 mm to 0.60 mm, and an average grain size is 70 μm to 200 μm.