Patents by Inventor Tesshu Murakawa
Tesshu Murakawa 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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Publication number: 20240158896Abstract: This non-oriented electrical steel sheet has a predetermined chemical composition, when EBSD observation is performed on a surface parallel to a steel sheet surface, in a case where a total area is indicated by Stot, an area of {100} orientated grains is indicated by S100, an area of orientated grains in which a Taylor factor M becomes more than 2.8 is indicated by Styl, a total area of orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by Stra, an average KAM value of the {100} orientated grains is indicated by K100, and an average KAM value of the orientated grains in which the Taylor factor M becomes more than 2.8 is indicated by Ktyl, 0.20?Styl/Stot?0.85, 0.05?S100/Stot?0.80, S100/Stot?0.5, and K100/Ktyl?0.990 are satisfied.Type: ApplicationFiled: March 18, 2022Publication date: May 16, 2024Applicant: NIPPON STEEL CORPORATIONInventors: Tesshu MURAKAWA, Satoshi KANO
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Publication number: 20240153683Abstract: This non-oriented electrical steel sheet has a predetermined chemical composition, when EBSD observation is performed on a surface parallel to a steel sheet surface, in a case where a total area is indicated by Stot, an area of {411} orientated grains is indicated by S411, an area of orientated grains in which a Taylor factor M becomes more than 2.8 is indicated by Styl, a total area of orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by Stra, an average KAM value of the {411} orientated grains is indicated by K411, and an average KAM value of the orientated grains in which the Taylor factor M becomes more than 2.8 is indicated by Ktyl, 0.20?Styl/Stot?0.85, 0.05?S411/Stot?0.80, S411/Stra?0.50, and K411/Ktyl?0.990 are satisfied.Type: ApplicationFiled: March 18, 2022Publication date: May 9, 2024Applicant: NIPPON STEEL CORPORATIONInventor: Tesshu MURAKAWA
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Publication number: 20240154472Abstract: The rotating electrical machine includes a stator, a rotor, and a casing that accommodates the stator and the rotor, in which at least one of the following conditions 1 and 2 is satisfied. Condition 1: a thermal conductivity A of a non-oriented electrical steel sheet that is used for a core of the stator is in a range of 12 to 35 W/(m·K), a thermal conductivity B of a non-oriented electrical steel sheet that is used for a core of the rotor is in a range of 10 to 33 W/(m·K), and both the thermal conductivities have a relationship of an expression (1) of A>B Condition 2: a thermal diffusivity A1 of the non-oriented electrical steel sheet that is used for the core of the stator is in a range of 3.0×10?6 to 9.0×10?6 m2/sW/(m·K), a thermal diffusivity B1 of the non-oriented electrical steel sheet that is used for the core of the rotor is in a range of 2.5×10?6 to 8.Type: ApplicationFiled: March 30, 2022Publication date: May 9, 2024Applicant: NIPPON STEEL CORPORATIONInventors: Tesshu MURAKAWA, Yoshiaki NATORI
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Publication number: 20240141463Abstract: This non-oriented electrical steel sheet has a predetermined chemical composition, one or more particles that are a precipitate of a sulfide or an oxysulfide of one or more selected from the group consisting of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd or both the sulfide and the oxysulfide and have a diameter of more than 0.5 ?m are present in a visual field of 10000 ?m2, and, when EBSD observation is performed on a surface parallel to a steel sheet surface, in a case where a total area is indicated by Stot, an area of {100} orientated grains is indicated by S100, an area of orientated grains in which a Taylor factor M becomes more than 2.8 is indicated by Styl, a total area of orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by Stra, an average KAM value of the {100} orientated grains is indicated by K100, and an average KAM value of the orientated grains in which the Taylor factor M becomes more than 2.8 is indicated by Ktyl, 0.20?Styl/Stot?0.85, 0.05?S100/Stot?0.Type: ApplicationFiled: March 18, 2022Publication date: May 2, 2024Applicant: NIPPON STEEL CORPORATIONInventors: Tesshu MURAKAWA, Minako FUKUCHI
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Patent number: 11952641Abstract: A non oriented electrical steel sheet consists of a silicon steel sheet and an insulation coating. The silicon steel sheet includes an internally oxidized layer containing SiO2 in a surface thereof, an average thickness of the internally oxidized layer is 0.10 to 5.0 ?m, and a Vickers hardness in the internally oxidized layer is 1.15 to 1.5 times as compared with a Vickers hardness in a thickness central area.Type: GrantFiled: March 20, 2019Date of Patent: April 9, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Masaru Takahashi, Takeru Ichie, Tesshu Murakawa, Shinichi Matsui, Fuminobu Murakami
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Patent number: 11942246Abstract: A non-oriented electrical steel sheet of the present invention has a chemical composition capable of causing ?-? transformation, and contains 0.0005% to 0.0050% of Ti, in which, in a case where an area ratio of grains having a crystal orientation of an {hkl}<uvw> orientation (within a tolerance of 10°) when measured by EBSD is denoted as Ahkl-uvw, A411-011 is 15.0% or more, and the non-oriented electrical steel sheet has an average grain size of 10.0 ?m to 40.0 ?m.Type: GrantFiled: March 31, 2022Date of Patent: March 26, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Minako Fukuchi, Yoshiaki Natori, Tesshu Murakawa
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Publication number: 20240096531Abstract: 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 ?m 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 ?m 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).Type: ApplicationFiled: March 28, 2022Publication date: March 21, 2024Applicant: NIPPON STEEL CORPORATIONInventors: Ichiro TANAKA, Takeaki WAKISAKA, Tesshu MURAKAWA, Yoshiaki NATORI, Hiroshi FUJIMURA
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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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Publication number: 20240047106Abstract: A non-oriented electrical steel sheet of the present invention has a chemical composition capable of causing ?-? transformation, and contains 0.0005% to 0.0050% of Ti, in which, in a case where an area ratio of grains having a crystal orientation of an {hkl}<uvw> orientation (within a tolerance of 10°) when measured by EBSD is denoted as Ahkl-uvw, A411-011 is 15.0% or more, and the non-oriented electrical steel sheet has an average grain size of 10.0 ?m to 40.0 ?m.Type: ApplicationFiled: March 31, 2022Publication date: February 8, 2024Applicant: NIPPON STEEL CORPORATIONInventors: Minako FUKUCHI, Yoshiaki NATORI, Tesshu MURAKAWA
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Publication number: 20240043970Abstract: A non-oriented electrical steel sheet of the present invention has a chemical composition capable of causing ?-? transformation, in which, in a case where an area ratio of grains having a crystal orientation of an {hkl}<uvw>orientation (within a tolerance of 10°) when measured by EBSD is denoted as Ahkl-uvw, A411?011 is 15.0% or more, and the non-oriented electrical steel sheet has an average grain size of 10.0 ?m to 40.0 ?m.Type: ApplicationFiled: March 31, 2022Publication date: February 8, 2024Applicant: NIPPON STEEL CORPORATIONInventors: Minako FUKUCHI, Yoshiaki NATORI, Tesshu MURAKAWA
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Publication number: 20240035130Abstract: A non-oriented electrical steel sheet according to the present invention has a chemical composition in which ?-? transformation can occur and which contains at least, in terms of mass %, at most 0.010% of C, 1.50% to 4.00% of Si, 0.0001% to 1.0% of sol. Al, at most 0.010% of S, at most 0.010% of N, and a total of 2.50% to 5.00% of at least one selected from the group consisting of Mn, Ni, and Cu, with the balance including Fe and impurities, wherein when an average grain size of {411} crystal grains is defined as d411 and an average grain size of {111} crystal grains is defined as d111, d411/d111?1.10.Type: ApplicationFiled: March 31, 2022Publication date: February 1, 2024Applicant: NIPPON STEEL CORPORATIONInventors: Minako FUKUCHI, Yoshiaki NATORI, Tesshu MURAKAWA
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Publication number: 20230353023Abstract: A rotating electrical machine includes a stator, a rotor, and a casing that accommodates the stator and the rotor, in which a {111}<211> orientation intensity (A) of a core material of the stator is in a range of 2 to 30, a {111}<211> orientation intensity (B) of a core material of the rotor is in a range of 1 to 15, and both the orientation intensities satisfy a relationship of an expression (1) A>B.Type: ApplicationFiled: March 30, 2022Publication date: November 2, 2023Applicant: NIPPON STEEL CORPORATIONInventors: Tesshu MURAKAWA, Yoshiaki NATORI
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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: 20220396846Abstract: A method for manufacturing a non-oriented electrical steel sheet includes a step of performing hot rolling on a steel material having a predetermined chemical composition, a step of performing first cold rolling, a step of performing process annealing, a step of performing second cold rolling, and a step of performing any one or both of final annealing and stress relief annealing. A final pass of finish rolling is performed in a temperature range equal to or higher than an Ar1 temperature, the steel sheet is held for 2 hours or less in a temperature range lower than an Ac1 temperature in the final annealing, and the steel sheet is held for 1200 sec or more in a temperature range equal to or higher than 600° C. and lower than the Ac1 temperature in the stress relief annealing.Type: ApplicationFiled: November 13, 2020Publication date: December 15, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Tesshu MURAKAWA, Hiroshi FUJIMURA
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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: 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: 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: 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