Patents by Inventor Miho Tomita
Miho Tomita has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 12211633Abstract: What is provided is a non-oriented electrical steel sheet having a chemical composition in which, by mass %, C: 0.010% or less, Si: 1.50% to 4.00%, sol. Al: 0.0001% to 1.0%, S: 0.010% or less, N: 0.010% or less and one or a plurality of elements selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu and Au: 2.50% to 5.00% in total with a remainder including Fe and impurities, in which a recrystallization rate is 1% to 99% in a metallographic structure, a sheet thickness is 0.50 mm or less, and, in the case of measuring a magnetic flux density B50 after annealing the non-oriented electrical steel sheet at 800° C. for two hours, a magnetic flux density B50 in a 45° direction with respect to a rolling direction is 1.75 T or more.Type: GrantFiled: November 13, 2020Date of Patent: January 28, 2025Assignee: NIPPON STEEL CORPORATIONInventors: Tesshu Murakawa, Miho Tomita, Hiroshi Fujimura, Satoshi Kano
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Patent number: 12195831Abstract: What is provided is a non-oriented electrical steel sheet having a chemical composition in which, by mass %, C: 0.010% or less, Si: 1.50% to 4.00%, sol. Al: 0.0001% to 1.0%, S: 0.010% or less, N: 0.010% or less, one or a plurality of elements selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu and Au: 2.50% to 5.00% in total are contained and a remainder includes Fe and impurities, in which a sheet thickness is 0.50 mm or less, and, in an arbitrary cross section, when an area ratio of {100} crystal grains is indicated by Sac, an area ratio of {110} crystal grains is indicated by Sag, and an area ratio of the {100} crystal grains in a region of up to 20% from a side where a KAM value is high is indicated by Sbc, Sac>Sbc>Sag and 0.05>Sag are satisfied.Type: GrantFiled: November 13, 2020Date of Patent: January 14, 2025Assignee: NIPPON STEEL CORPORATIONInventors: Tesshu Murakawa, Miho Tomita, Hiroshi Fujimura, Satoshi Kano
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Patent number: 12148555Abstract: 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 ?m and 120 ?m or less.Type: GrantFiled: November 1, 2019Date of Patent: November 19, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Hiroyoshi Yashiki, Yoshiaki Natori, Miho Tomita, Kazutoshi Takeda, Takuya Matsumoto
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Patent number: 12142966Abstract: 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.Type: GrantFiled: November 13, 2020Date of Patent: November 12, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Masahito Kamikawabata, Miho Tomita, Tesshu Murakawa
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Publication number: 20240047105Abstract: What is provided is a non-oriented electrical steel sheet having a chemical composition in which, by mass %, C: 0.010% or less, Si: 1.50% to 4.00%, sol. Al: 0.0001% to 1.0%, S: 0.010% or less, N: 0.010% or less and one or a plurality of elements selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu and Au: 2.50% to 5.00% in total with a remainder including Fe and impurities, in which a recrystallization rate is 1% to 99% in a metallographic structure, a sheet thickness is 0.50 mm or less, and, in the case of measuring a magnetic flux density B50 after annealing the non-oriented electrical steel sheet at 800° C. for two hours, a magnetic flux density B50 in a 45° direction with respect to a rolling direction is 1.75 T or more.Type: ApplicationFiled: November 13, 2020Publication date: February 8, 2024Applicant: NIPPON STEEL CORPORATIONInventors: Tesshu MURAKAWA, Miho TOMITA, Hiroshi FUJIMURA, Satoshi KANO
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Patent number: 11866797Abstract: This non-oriented electrical steel sheet includes a base metal having a predetermined chemical composition satisfying the expression [Si+0.5×Mn?4.3], and an average grain size of the base metal is more than 40 ?m and 120 ?m or less.Type: GrantFiled: November 1, 2019Date of Patent: January 9, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Hiroyoshi Yashiki, Yoshiaki Natori, Miho Tomita, Kazutoshi Takeda, Takuya Matsumoto
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Patent number: 11795518Abstract: Provided are a non-oriented electrical steel sheet with which it is possible to improve steel sheet transferability even when punching is performed successively at high speed, and a method of manufacturing a stacked core using the same. The non-oriented electrical steel sheet contains, by mass percent, Si: 2.0 to 5.0%, Mn: 0.4 to 5.0%, Al?3.0%, C: 0.0008 to 0.0100%, N?0.0030%, S?0.0030%, and Ti?0.0060%, wherein the product of the contents of Mn and C is 0.004 to 0.05 mass %2, the yield strength in rolling direction is more than or equal to 600 MPa, and the Young's modulus is more than or equal to 200 GPa. In the method of manufacturing a stacked core, when manufacturing a stacked core using a progressive die, the steel sheet transfer speed V (m/s) satisfies expression (1). V: VMIN to VMAX (1) VMAX=( 1/25)?(t2×E×YS) (2) VMIN=( 1/25)?(t2×120000) (3) t: Steel sheet thickness (mm), E: Young's ratio (GPa), YS: Yield strength (MPa).Type: GrantFiled: October 24, 2019Date of Patent: October 24, 2023Assignee: NIPPON STEEL CORPORATIONInventors: Hiroshi Fujimura, Satoshi Kano, Miho Tomita
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Publication number: 20230139246Abstract: A non-oriented electrical steel sheet including a base metal that has a chemical composition including, in mass%, C: 0.0010 to 0.0040%, Si: 4.0 to 5.0%, Mn: 0.20% or less Al: 0.010% or more and less than 0.050%, P: 0.030% or less, S: 0.0030% or less, N: 0.0005 to 0.0030%, O: 0.0100 to 0.0400%, Ca: less than 0.0010%, Ti: less than 0.0050%, Nb: less than 0.0050%, Zr: less than 0.0050%, V: less than 0.0050%, Cu: less than 0.20%, Ni: less than 0.50%, Sn: 0 to 0.05%, Sb: 0 to 0.05%, and a balance: Fe and impurities, in which the base metal has an O content of less than 0.0050% in a region excluding a portion from a surface of the base metal to a position of 10 µm in a depth direction of the base metal.Type: ApplicationFiled: April 16, 2021Publication date: May 4, 2023Inventors: Hiroyoshi YASHIKI, Yoshiaki NATORI, Miho TOMITA, Kazutoshi TAKEDA, Takuya MATSUMOTO
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Publication number: 20230137498Abstract: A non-oriented electrical steel sheet including a base metal that has a chemical composition including, in mass %, C: 0.0010 to 0.0040%, Si: 3.5 to 4.9%, Mn: 0.05 to 0.20%, Al: 0.05 to 0.45%, P: 0.030% or less, S: 0.0030% or less, N: 0.0030% or less, O: 0.0100 to 0.0400%, Ca: less than 0.0010%, Ti: less than 0.0050%, Nb: less than 0.0050%, Zr: less than 0.0050%, V: less than 0.0050%, Cu: less than 0.20%, Ni: less than 0.50%, Sn: 0 to 0.05%, Sb: 0 to 0.05%, and a balance: Fe and impurities, and satisfying [4.0?Si+Al?5.0], in which the base metal has an O content of less than 0.0050% in a region excluding a portion from a surface of the base metal to a position of 10 ?m in a depth direction of the base metal.Type: ApplicationFiled: April 16, 2021Publication date: May 4, 2023Inventors: Hiroyoshi YASHIKI, Yoshiaki NATORI, Miho TOMITA, Kazutoshi TAKEDA, Takuya MATSUMOTO
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Publication number: 20230104017Abstract: A chemical composition of a base metal of a non-oriented electrical steel sheet contains, by mass %, C: 0.0050% or less, Si: 3.8% to 5.0%, Mn: exceeding 0.2% and less than 2.0%, P: 0.030% or less, S: 0.0030% or less, Al: 0.005% or more and less than 0.050%, N: 0.0005% to 0.0030%, Ti: less than 0.0050%, Nb: less than 0.0050%, Zr: less than 0.0050%, V: less than 0.0050%, Cu: less than 0.20%, Ni: less than 0.50%, Sn: 0% to 0.10%, Sb: 0% to 0.10%, a remainder: Fe and impurities. [Si+0.5×Mn?4.3] is satisfied and the average grain size of the base metal is in a range of 10 to 80 ?m.Type: ApplicationFiled: April 2, 2020Publication date: April 6, 2023Applicant: NIPPON STEEL CORPORATIONInventors: Hiroyoshi YASHIKI, Yoshiaki NATORI, Miho TOMITA, Kazutoshi TAKEDA, Takuya MATSUMOTO
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Publication number: 20230106818Abstract: A non-oriented electrical steel sheet has a predetermined chemical composition. The chemical composition satisfies (2×[Mn]+2.5×[Ni]+[Cu])?([Si]+2×[sol.Al]+4×[P])?1.50%. In a case where Ahkl-uvw represents the area ratio of crystal grains in an {hkl}<uvw> orientation to the entire visual field when a plane at a depth of ½ of a sheet thickness from a surface parallel to a rolled surface is measured by SEM-EBSD, A411-011 is 15.0% or more, and the average grain size is 50 ?m to 150 ?m.Type: ApplicationFiled: March 24, 2021Publication date: April 6, 2023Applicant: NIPPON STEEL CORPORATIONInventors: Minako FUKUCHI, Ichiro TANAKA, Miho TOMITA, Tesshu MURAKAWA
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Publication number: 20220407371Abstract: The present invention is a stator core having a plurality of laminated electrical steel sheets, in which, among a plurality of teeth (121a to 121p) of the stator core, a width of teeth along a direction in which magnetic characteristics are excellent may be narrower than a width of teeth along a direction in which the magnetic characteristics are poor.Type: ApplicationFiled: November 13, 2020Publication date: December 22, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Yasuo OHSUGI, Miho TOMITA, Tesshu MURAKAWA
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Publication number: 20220385119Abstract: 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.Type: ApplicationFiled: November 13, 2020Publication date: December 1, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Masahito KAMIKAWABATA, Miho TOMITA, Tesshu MURAKAWA
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Publication number: 20220385118Abstract: 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.Type: ApplicationFiled: November 13, 2020Publication date: December 1, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Masahito KAMIKAWABATA, Miho TOMITA, Tesshu MURAKAWA
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Publication number: 20220384085Abstract: A laminated core (100) has a plurality of legs having an extension direction in a direction perpendicular to a lamination direction of electrical steel sheets and a plurality of yokes having an extension direction in a direction orthogonal to the lamination direction of the electrical steel sheets and the extension direction of the legs, and, in the same position of the electrical steel sheet in the lamination direction, at least a partial region of the legs and at least a partial region of the yokes are configured by the same electrical steel sheet. The electrical steel sheet is disposed such that a first direction of directions of easy magnetization of the electrical steel sheet is along the extension direction of the legs and a second direction of the directions of easy magnetization of the electrical steel sheet is along the extension direction of the yokes.Type: ApplicationFiled: November 13, 2020Publication date: December 1, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Ryu HIRAYAMA, Tesshu MURAKAWA, Miho TOMITA
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Publication number: 20220356549Abstract: What is provided is a non-oriented electrical steel sheet having a chemical composition in which, by mass %, C: 0.010% or less, Si: 1.50% to 4.00%, sol. Al: 0.0001% to 1.0%, S: 0.010% or less, N: 0.010% or less, one or a plurality of elements selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu and Au: 2.50% to 5.00% in total are contained and a remainder includes Fe and impurities, in which a sheet thickness is 0.50 mm or less, and, in an arbitrary cross section, when an area ratio of {100} crystal grains is indicated by Sac, an area ratio of {110} crystal grains is indicated by Sag, and an area ratio of the {100} crystal grains in a region of up to 20% from a side where a KAM value is high is indicated by Sbc, Sac>Sbc>Sag and 0.05>Sag are satisfied.Type: ApplicationFiled: November 13, 2020Publication date: November 10, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Tesshu MURAKAWA, Miho TOMITA, Hiroshi FUJIMURA, Satoshi KANO
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Publication number: 20220349037Abstract: A method for manufacturing a non-oriented electrical steel sheet includes a step of obtaining a hot-rolled steel sheet by performing hot rolling on a steel material having a predetermined chemical composition, a step of performing first cold rolling on the hot-rolled steel sheet, and a step of performing first annealing after the first cold rolling. A final pass of finish rolling is performed in a temperature range equal to or higher than an Ar1 temperature, and cooling of which an average cooling rate is in a range of 50 to 500° C./sec is started in 0.1 sec from completion of rolling of the final pass of the finish rolling and is performed up to a temperature range higher than 250° C. and equal to or lower than 700° C.Type: ApplicationFiled: November 13, 2020Publication date: November 3, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Tesshu MURAKAWA, Miho TOMITA, Satoshi KANO
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Publication number: 20220186336Abstract: This electrical steel sheet contains, as a chemical composition, by mass %, C: 0.0035% or less, Si: 2.00% to 3.50%, Mn: 2.00% to 5.00%, P: 0.050% or less, S: 0.0070% or less, Al: 0.15% or less, N: 0.0030% or less, Ni: 0% to 1.00%, Cu: 0% to 0.10%, and a remainder: Fe and impurities, in which an X-ray random intensity ratio in a {100} <011> crystal orientation on a sheet surface is 15.0 to 50.0, and magnetic flux densities in 0°, 22.5°, and 45° directions from a rolling direction each satisfy [1.005×(B50 (0°)+B50 (45°))/2?B50 (22.5°)].Type: ApplicationFiled: April 1, 2020Publication date: June 16, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Miho TOMITA, Yoshiaki NATORI, Hiroyoshi YASHIKI, Hiroshi FUJIMURA
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Patent number: 11279985Abstract: A non-oriented electrical steel sheet includes, as a chemical composition, by mass %: C: 0.0015% to 0.0040%; Si: 3.5% to 4.5%; Al: 0.65% or less; Mn: 0.2% to 2.0%; Sn: 0% to 0.20%; Sb: 0% to 0.20%; P: 0.005% to 0.150%; S: 0.0001% to 0.0030%; Ti: 0.0030% or less; Nb: 0.0050% or less; Zr: 0.0030% or less; Mo: 0.030% or less; V: 0.0030% or less; N: 0.0010% to 0.0030%; O: 0.0010% to 0.0500%; Cu: less than 0.10%; Ni: less than 0.50%; and a remainder including Fe and impurities, in which a product sheet thickness is 0.10 mm to 0.30 mm, an average grain size is 10 ?m to 40 ?m, an iron loss W10/800 is 50 W/Kg or less, a tensile strength is 580 MPa to 700 MPa, and a yield ratio is 0.82 or more.Type: GrantFiled: July 19, 2018Date of Patent: March 22, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Yoshiaki Natori, Kazutoshi Takeda, Hiroyoshi Yashiki, Miho Tomita, Hiroshi Fujimura, Takeaki Wakisaka, Tesshu Murakawa, Takuya Matsumoto, Hiroki Hori, Yuuya Gohmoto, O Uyama
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Publication number: 20220021248Abstract: A non-oriented electrical steel sheet has a chemical composition containing, in terms of % by mass, C: 0.0015% or less and Si: 2.5 to 4.0% and having an average crystal grain size of 10 to 40 ?m, and an internal oxidation layer having a thickness of 0.5 to 3.0 ?m present in a sheet thickness direction of a surface thereof.Type: ApplicationFiled: January 17, 2020Publication date: January 20, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Yoshiaki NATORI, Hiroyoshi YASHIKI, Miho TOMITA