Patents by Inventor Kazutoshi Takeda

Kazutoshi Takeda 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).

  • Patent number: 11441215
    Abstract: A grain-oriented electrical steel sheet includes: a base steel sheet including, as a chemical composition, by mass %, C: 0.010% or less, Si: 2.50% to 4.00%, Mn: 0.050% to 1.000%, S+Se: 0.005% or less in total, Sol. Al: 0.005% or less, N: 0.005% or less, Bi+Te+Pb: 0% to 0.0300% in total, Sb: 0% to 0.50%, Sn: 0% to 0.50%, Cr: 0% to 0.50%, Cu: 0% to 1.0%, and a remainder of Fe and impurities; and a tension-applying insulation coating provided on a surface of the base steel sheet, in which, on the surface of the base steel sheet, an arithmetic average roughness Ra along a rolling 90° direction that is a direction perpendicular to a rolling direction is 0.60 ?m or less, and when a cross section of the base steel sheet is observed along the rolling 90° direction, recessed parts having a depth of 0.1 ?m or more and 2.0 ?m or less are present on the surface of the base steel sheet in 1.0/100 ?m or more and 6.0/100 ?m or less.
    Type: Grant
    Filed: March 22, 2019
    Date of Patent: September 13, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Ichiro Tanaka, Takashi Kataoka, Noriyoshi Kubota, Kazutoshi Takeda
  • Patent number: 11440846
    Abstract: A solution for forming an insulation coating of grain-oriented electrical steel sheet includes an aqueous solution prepared by mixing a phosphate solution and colloidal silica. Chromium is not added to the aqueous solution. The colloidal silica includes silica particles surface-modified by an aluminate or is prepared by adding an aluminate to colloidal silica such as conventional colloidal silica.
    Type: Grant
    Filed: May 27, 2013
    Date of Patent: September 13, 2022
    Assignee: Nippon Steel Corporation
    Inventors: Regis Lemaitre, Ludger Lahn, Carsten Schepers, Shuichi Yamazaki, Kazutoshi Takeda, Masaru Takahashi, Hirohiko Sato, Koji Kanehashi
  • Publication number: 20220243315
    Abstract: A grain oriented electrical steel sheet includes a base steel sheet, an oxide layer, and a tension-insulation coating. When a glow discharge spectroscopy is conducted in a region from a surface of the tension-insulation coating to an inside of the base steel sheet, a sputtering time Fe0.5 at which a Fe emission intensity becomes 0.5 times as compared with a saturation value thereof and a sputtering time Fe0.05 at which a Fe emission intensity becomes 0.05 times as compared with the saturation value satisfy 0.01<(Fe0.5?Fe0.05)/Fe0.5<0.35. Moreover, a magnetic flux density B8 in a rolling direction of the grain oriented electrical steel sheet is 1.90 T or more.
    Type: Application
    Filed: February 7, 2020
    Publication date: August 4, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Ichiro TANAKA, Takashi KATAOKA, Kazutoshi TAKEDA, Masamitsu KUBOTA, Hirotoshi TADA
  • Patent number: 11377569
    Abstract: An electrical steel sheet (10) is provided with a base iron (1) and an insulating film (2) formed on a surface of the base iron (1). The insulating film (2) contains: a first component: 100 parts by mass, the first component containing: a metal phosphate: 100 parts by mass; and one kind selected from a group consisting of an acrylic resin, an epoxy resin and a polyester resin which have an average particle size of 0.05 ?m to 0.50 ?m, or a mixture or copolymer of two or three kinds selected from the group: 1 part by mass to 50 parts by mass; and a second component composed of dispersion or powder of a fluorine resin having an average particle size of 0.05 ?m to 0.35 ?m: 0.5 parts by mass to 10 parts by mass.
    Type: Grant
    Filed: July 15, 2011
    Date of Patent: July 5, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Kazutoshi Takeda, Kenji Kosuge, Tatsuya Takase, Kohji Muneda
  • Publication number: 20220209592
    Abstract: What is disclosed is a core block, a plurality thereof constituting a laminated core by being connected in an annular shape, the core block including: a plurality of electrical steel sheet pieces stacked to each other; and an adhesion part which is provided between the electrical steel sheet pieces adjacent in a stacking direction and adheres the electrical steel sheet pieces to each other, in which an adhesion area ratio of the electrical steel sheet piece by the adhesion part is 1% or more and 60% or less.
    Type: Application
    Filed: June 22, 2020
    Publication date: June 30, 2022
    Inventors: Ryu HIRAYAMA, Kazutoshi TAKEDA
  • Patent number: 11332831
    Abstract: An insulating coating for an electrical steel sheet is provided that is formed on a surface of a base metal of the electrical steel sheet and that contains a polyvalent metal phosphate of one or more elements selected from Al, Zn, Mg and Ca, and has an enriched layer of a divalent metal at an interface with the surface of the base metal. An enrichment of the divalent metal contained in the enriched layer is 0.01 g/m2 or more and less than 0.2 g/m2.
    Type: Grant
    Filed: April 25, 2016
    Date of Patent: May 17, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Shuichi Yamazaki, Masaru Takahashi, Kazutoshi Takeda, Hiroyasu Fujii, Akira Akagi, Hiroki Hori
  • Patent number: 11295881
    Abstract: A non-oriented electrical steel sheet has a predetermined chemical composition, and when an average value of Mn concentrations in a range from a surface of a base iron to a position where a depth from the surface of the base iron is 2 ?m is set to [Mn2], and an Mn concentration at a position where a depth from the surface of the base iron is 10 ?m is set to [Mn10], the base iron satisfies the following expression 1. 0.1?[Mn2]/[Mn10]?0.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: April 5, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Yoshiaki Natori, Hiroyoshi Yashiki, Masaru Takahashi, Kazutoshi Takeda, Takuya Matsumoto
  • Publication number: 20220098692
    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 ?m, 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.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 31, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Kazutoshi TAKEDA, Ichiro TANAKA, Tomoya SUENAGA, Takashi KATAOKA, Yuki KUNITA
  • Publication number: 20220090242
    Abstract: A grain oriented electrical steel sheet includes a base steel sheet, an oxide layer, and a tension-insulation coating. When a glow discharge spectroscopy is conducted in a region from a surface of the tension-insulation coating to an inside of the base steel sheet, a sputtering time Fe0.5 at which a Fe emission intensity becomes 0.5 times as compared with a saturation value thereof and a sputtering time Fe0.05 at which a Fe emission intensity becomes 0.05 times as compared with the saturation value satisfy (Fe0.5?Fe0.05)/Fe0.5?0.35. A maximal point of a Cr emission intensity is included between the Fe0.05 and the Fesat. Moreover, a magnetic flux density B8 in a rolling direction of the grain oriented electrical steel sheet is 1.90 T or more.
    Type: Application
    Filed: February 7, 2020
    Publication date: March 24, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Ichiro TANAKA, Takashi KATAOKA, Kazutoshi TAKEDA, Masamitsu KUBOTA, Hirotoshi TADA
  • Publication number: 20220090241
    Abstract: A grain oriented electrical steel sheet includes a base steel sheet, an oxide layer, and a tension-insulation coating. When the iron oxide layer is analyzed by a fourier transform infrared spectroscopy, an absorbance A650 at 650 cm?1 and an absorbance A1250 at 1250 cm?1 satisfy 0.2?A650/A1250?5.0. Moreover, a magnetic flux density B8 in a rolling direction of the grain oriented electrical steel sheet is 1.90 T or more.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 24, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Ichiro TANAKA, Takashi KATAOKA, Kazutoshi TAKEDA, Tomoya SUENAGA, Yuki KUNITA
  • Publication number: 20220090239
    Abstract: A 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 and which includes: a base steel sheet containing a prescribed 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 ?m, and containing phosphate and colloidal silica as main components. When the tension-insulation coating undergoes elemental analysis using a glow discharge optical emission spectrometry in a sheet thickness direction from a surface of the tension-insulation coating, a peak Si emission intensity satisfies a prescribed requirement.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 24, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Kazutoshi TAKEDA, Ichiro TANAKA, Takashi KATAOKA, Tomoya SUENAGA, Yuki KUNITA
  • Publication number: 20220094218
    Abstract: A laminated core includes a plurality of electrical steel sheets stacked in a thickness direction, each of the electrical steel sheets includes an annular core back part; a plurality of fastening parts are provided in the core back part at intervals in a circumferential direction; an adhesion region is formed on an outer circumferential side from the fastening parts in the core back part; and a non-adhesion region is formed on an inner circumferential side from the fastening parts in the core back part.
    Type: Application
    Filed: December 17, 2019
    Publication date: March 24, 2022
    Inventors: Yasuo OHSUGI, Ryu HIRAYAMA, Kazutoshi TAKEDA
  • Patent number: 11279985
    Abstract: 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: Grant
    Filed: July 19, 2018
    Date of Patent: March 22, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Yoshiaki Natori, Kazutoshi Takeda, Hiroyoshi Yashiki, Miho Tomita, Hiroshi Fujimura, Takeaki Wakisaka, Tesshu Murakawa, Takuya Matsumoto, Hiroki Hori, Yuuya Gohmoto, O Uyama
  • Publication number: 20220069640
    Abstract: A laminated core includes a plurality of electrical steel sheets stacked in a thickness direction, the electrical steel sheet includes an annular core back part and a plurality of tooth parts that protrude from the core back part in a radial direction and are disposed at intervals in a circumferential direction of the core back part, a fastening part is provided in a portion of the core back part corresponding to the tooth part, and an adhesion part is provided in the tooth part.
    Type: Application
    Filed: December 17, 2019
    Publication date: March 3, 2022
    Inventors: Yasuo OHSUGI, Ryu HIRAYAMA, Kazutoshi TAKEDA
  • Publication number: 20220052570
    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.
    Type: Application
    Filed: December 17, 2019
    Publication date: February 17, 2022
    Inventors: Kazutoshi TAKEDA, Hiroyasu FUJII, Shinsuke TAKATANI
  • Publication number: 20220042136
    Abstract: This grain-oriented electrical steel sheet includes a base steel sheet, a forsterite-based primary film disposed on a surface of the base steel sheet, and a phosphate-based tension-imparting film containing no chromium, which is disposed on a surface of the primary film. In a case where a Ti content and a S content are respectively expressed as XTi and XS, by mass %, the forsterite-based primary film satisfies Expression (1) and Expression (2). A strain-introduced magnetic domain control is performed on the grain-oriented electrical steel sheet. 0.10?XTi/XS?10.00 ??Expression (1) XTi+XS?0.10 mass %.
    Type: Application
    Filed: December 24, 2019
    Publication date: February 10, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Satoshi ARAI, Hideyuki HAMAMURA, Kazutoshi TAKEDA, Takeo ARAMAKI, Hirotoshi TADA
  • Publication number: 20220037939
    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.
    Type: Application
    Filed: December 17, 2019
    Publication date: February 3, 2022
    Inventors: Kazutoshi TAKEDA, Hiroyasu FUJII, Shinsuke TAKATANI
  • Publication number: 20220025228
    Abstract: Provided is an electric motor using a laminated core in which punched electrical steel sheets are adhered to each other with a high adhesion strength. The laminated core includes: a plurality of electrical steel sheets which are stacked on each other and of which both surfaces are coated with an insulation coating; and an adhesion part which is disposed between the electrical steel sheets adjacent to each other in a stacking direction and adheres the electrical steel sheets to each other, wherein all sets of the electrical steel sheets adjacent to each other in the stacking direction are adhered to each other by the adhesion parts, wherein the adhesion parts are provided at a plurality of positions between the electrical steel sheets, and wherein the adhesion part is a layer made of an adhesive containing any one or both of an acrylic resin and an epoxy resin and having an SP value of 7.8 to 10.7 (cal/cm3)1/2.
    Type: Application
    Filed: December 17, 2019
    Publication date: January 27, 2022
    Inventors: Shinsuke TAKATANI, Hiroyasu FUJII, Kazutoshi TAKEDA
  • Publication number: 20220029478
    Abstract: A laminated core includes a plurality of electrical steel sheets which are stacked on each other and of each of which both surfaces are coated with an insulation coating; and an adhesion part which is provided between the electrical steel sheets adjacent in the stacking direction and adheres the electrical steel sheets to each other, wherein an adhesive for forming the adhesion part includes a first phase and a second phase, wherein the adhesion part has a sea-island structure of the first phase which is a sea structure portion and the second phase which is an island structure portion, wherein the first phase contains an epoxy resin, an acrylic resin, and a curing agent, wherein the first phase has an SP value of 8.5 to 10.7 (cal/cm3)1/2, wherein the second phase contains an elastomer, and wherein the second phase has an SP value of 7.5 to 8.4 (cal/cm3)1/2.
    Type: Application
    Filed: December 17, 2019
    Publication date: January 27, 2022
    Inventors: Shinsuke TAKATANI, Hiroyasu FUJII, Kazutoshi TAKEDA
  • Publication number: 20220028607
    Abstract: A laminated core includes a plurality of electrical steel sheets stacked on each other, and an adhesion part which is provided between the electrical steel sheets adjacent to each other in a stacking direction and adheres the electrical steel sheets to each other, in which the electrical steel sheet include 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, an adhesion region in which the adhesion part is provided is formed in the core back part of the electrical steel sheet, and the adhesion region extends in a direction along a magnetic flux passing through a region of the electrical steel sheet in contact with the adhesion region.
    Type: Application
    Filed: December 17, 2019
    Publication date: January 27, 2022
    Inventors: Ryu HIRAYAMA, Kazutoshi TAKEDA