Patents by Inventor Shigeho Tanigawa
Shigeho Tanigawa 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: 11562836Abstract: The present invention is intended to increase the critical current density of a wire rod having a shape with good symmetry such as a round wire or a square wire by making use of mechanical milling method. The production method of the present invention for the MgB2 superconducting wire rod comprises a mixing process of preparing a powder by adding a solid organic compound to a magnesium powder and a boron powder and then applying an impact to the powder to prepare a mixture of the powder in which boron particles are dispersed inside magnesium particles, a filling process of filling a metal tube with the mixture, an elongation process of elongating the metal tube filled with the mixture and a heat treatment process of heat-treating the metal tube to synthesize MgB2.Type: GrantFiled: March 10, 2017Date of Patent: January 24, 2023Assignee: HITACHI, LTD.Inventors: Motomune Kodama, Shigeho Tanigawa, Hiroshi Kotaki, Hideki Tanaka, Kazuya Nishi, Takaaki Suzuki
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Publication number: 20200090835Abstract: The present invention is intended to increase the critical current density of a wire rod having a shape with good symmetry such as a round wire or a square wire by making use of mechanical milling method. The production method of the present invention for the MgB2 superconducting wire rod comprises a mixing process of preparing a powder by adding a solid organic compound to a magnesium powder and a boron powder and then applying an impact to the powder to prepare a mixture of the powder in which boron particles are dispersed inside magnesium particles, a filling process of filling a metal tube with the mixture, an elongation process of elongating the metal tube filled with the mixture and a heat treatment process of heat-treating the metal tube to synthesize MgB2.Type: ApplicationFiled: March 10, 2017Publication date: March 19, 2020Inventors: Motomune KODAMA, Shigeho TANIGAWA, Hiroshi KOTAKI, Hideki TANAKA, Kazuya NISHI, Takaaki SUZUKI
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Patent number: 9553495Abstract: A wound core formed of a magnetic thin band, an electromagnetic component and a manufacturing method therefor and electromagnetic equipment in which iron loss and cost reduction can be achieved are provided. The wound core is a wound core formed by winding a magnetic thin band in the axial direction. A cutout portion is formed from place to place on an end face of the thin band in the axial direction and the cutout portions are arranged in random directions in the direction of the radius of the wound core.Type: GrantFiled: February 6, 2012Date of Patent: January 24, 2017Assignee: HITACHI METALS, LTD.Inventors: Zhuonan Wang, Yuji Enomoto, Shigeho Tanigawa
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Patent number: 9449752Abstract: It is an objective of the invention to provide a dust core made of an Fe-based amorphous metal powder having excellent magnetic properties, in which the dust core has a higher-than-conventional density, excellent magnetic properties and a high mechanical strength. There is provided a dust core including a mixture powder compacted, the mixture powder including: an Fe-based amorphous metal powder having a crystallization temperature Tx (unit: K), the Fe-based amorphous metal powder being plastically deformed, the plastically deformed metal Fe-based amorphous metal powder having a filling factor in the dust core higher than 80% and not higher than 99%; and a resin binder having a melting point Tm (unit: K), in which the Tx and Tm satisfy a relationship of “Tm/Tx?0.70”.Type: GrantFiled: October 23, 2014Date of Patent: September 20, 2016Assignee: Hitachi Metals, Ltd.Inventors: Masami Taguchi, Shigeho Tanigawa, Shin Noguchi
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Patent number: 9054572Abstract: A wound core formed of a magnetic thin band, an electromagnetic component and a manufacturing method therefor and electromagnetic equipment in which iron loss and cost reduction can be achieved are provided. The wound core is a wound core formed by winding a magnetic thin band in the axial direction. A cutout portion is formed from place to place on an end face of the thin band in the axial direction and the cutout portions are arranged in random directions in the direction of the radius of the wound core.Type: GrantFiled: February 6, 2012Date of Patent: June 9, 2015Assignee: HITACHI METALS, LTD.Inventors: Zhuonan Wang, Yuji Enomoto, Shigeho Tanigawa
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Publication number: 20150115766Abstract: It is an objective of the invention to provide a dust core made of an Fe-based amorphous metal powder having excellent magnetic properties, in which the dust core has a higher-than-conventional density, excellent magnetic properties and a high mechanical strength. There is provided a dust core including a mixture powder compacted, the mixture powder including: an Fe-based amorphous metal powder having a crystallization temperature Tx (unit: K), the Fe-based amorphous metal powder being plastically deformed, the plastically deformed metal Fe-based amorphous metal powder having a filling factor in the dust core higher than 80% and not higher than 99%; and a resin binder having a melting point Tm (unit: K), in which the Tx and Tm satisfy a relationship of “Tm/Tx?0.70”.Type: ApplicationFiled: October 23, 2014Publication date: April 30, 2015Inventors: Masami TAGUCHI, Shigeho TANIGAWA, Shin NOGUCHI
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Patent number: 8680736Abstract: An armature core includes a core portion formed of a lamination of plural non-crystalline metallic foil bands, wherein the armature core is provided with at least two cut surfaces with respect to the lamination layers. Amorphous metal is used as the iron base of the non-crystalline metallic foil bands. The cut surfaces are perpendicular to the lamination layers of the non-crystalline foil bands. Still further, the stator includes a stator core holding member in a disc form, the stator having a plurality of holes or recessions that are substantially in the same shape as a cross-sectional shape of the stator cores and wherein the stator cores are inserted in the holes or recessions of the stator core holding member and held by fixing in vicinities of respective central portions thereof, the central portions being with respect to the axial direction thereof.Type: GrantFiled: November 10, 2009Date of Patent: March 25, 2014Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Zhuonan Wang, Yuji Enomoto, Shigeki Morinaga, Ryoso Masaki, Shigeho Tanigawa, Hiromitsu Itabashi, Motoya Ito
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Publication number: 20120248930Abstract: A wound core formed of a magnetic thin band, an electromagnetic component and a manufacturing method therefor and electromagnetic equipment in which iron loss and cost reduction can be achieved are provided. The wound core is a wound core formed by winding a magnetic thin band in the axial direction. A cutout portion is formed from place to place on an end face of the thin band in the axial direction and the cutout portions are arranged in random directions in the direction of the radius of the wound core.Type: ApplicationFiled: February 6, 2012Publication date: October 4, 2012Inventors: Zhuonan WANG, Yuji ENOMOTO, Shigeho TANIGAWA
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Patent number: 7981359Abstract: A rotor comprising bonded magnet portions mainly composed of magnet powder and a binder, which are embedded in a soft magnetic portion mainly composed of soft magnetic powder and a binder, the rotor being produced by a compression-molding method, and the magnetic pole surfaces of the bonded magnet portions being embedded in the soft magnetic portion.Type: GrantFiled: December 7, 2004Date of Patent: July 19, 2011Assignee: Hitachi Metals, Ltd.Inventors: Masahiro Masuzawa, Shigeho Tanigawa, Masahiro Mita, Keiko Kikuchi
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Patent number: 7847460Abstract: This invention provides a soft magnetic yoke-integrated bonded magnet in which a soft magnetic yoke has been integrally compression molded in such a state that the soft magnetic yoke is engaged in a joined face formed by bringing a binding material-containing magnetic powder into contact with a binding material-containing soft magnetic powder. The soft magnetic yoke part and the bonded magnetic part are constructed so that, when the soft magnetic yoke part and the bonded magnet part are compression molded separately from each other, the spring back level is identical upon the release of the compression force.Type: GrantFiled: February 28, 2007Date of Patent: December 7, 2010Assignee: Hitachi Metals, Ltd.Inventors: Masahiro Masuzawa, Masahiro Mita, Shigeho Tanigawa, Kyohei Aimuta
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Patent number: 7815752Abstract: Disclosed is a novel process for producing an NaZn13 magnetic alloy which enables to obtain a magnetic alloy having higher characteristics than ever before. Specifically disclosed is a magnetic alloy represented by the following composition formula: (La1?xRx)a(A1?yTMy)bHcNd (wherein R represents at least one or more elements selected from rare earth elements including Y; A represents Si, or Si and at least one or more elements selected from the group consisting of Al, Ga, Ge and Sn; TM represents Fe, or Fe and at least one or more elements selected from the group consisting of Sc, Ti, V, Cr, Mn, Co, Ni, Cu and Zn; and x, y, a, b, c and d respectively satisfy, in atomic percent, the following relations: 0?x?0.2, 0.75?y?0.92, 5.5 ?a?7.5, 73?b?85, 1.7?c?14 and 0.07?d<5.0; with unavoidable impurities being included).Type: GrantFiled: April 4, 2006Date of Patent: October 19, 2010Assignee: Hitachi Metals, Ltd.Inventor: Shigeho Tanigawa
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Publication number: 20100148611Abstract: An armature core includes a core portion formed of a lamination of plural noncrystalline metallic foil bands and resin for bond-fixing the non-crystalline metallic foil bands, wherein the armature core is provided with at least two cut surfaces with respect to the lamination layers. Amorphous metal is used as the iron base of the non-crystalline metallic foil bands. The cut surfaces are perpendicular to the lamination-layers of the non-crystalline foil bands. For the amorphous core, a resin mold is formed. The contact portions between winding wires and amorphous are provided with edge roundness. Further, an axial gap motor using cut cores of amorphous lamination as stator cores is provided.Type: ApplicationFiled: November 10, 2009Publication date: June 17, 2010Inventors: Zhuonan Wang, Yuji ENOMOTO, Shigeki MORINAGA, Ryoso MASAKI, Shigeho TANIGAWA, Hiromitsu ITABASHI, Motoya ITO
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Publication number: 20090194202Abstract: Disclosed is a novel process for producing an NaZn13 magnetic alloy which enables to obtain a magnetic alloy having higher characteristics than ever before. Specifically disclosed is a magnetic alloy represented by the following composition formula: (La1-xRx)a(A1-yTMy)bHcNd (wherein R represents at least one or more elements selected from rare earth elements including Y; A represents Si, or Si and at least one or more elements selected from the group consisting of Al, Ga, Ge and Sn; TM represents Fe, or Fe and at least one or more elements selected from the group consisting of Sc, Ti, V, Cr, Mn, Co, Ni, Cu and Zn; and x, y, a, b, c and d respectively satisfy, in atomic percent, the following relations: 0?x?0.2, 0.75?y?0.92, 5.5?a?7.5, 73?b?85, 1.7?c?14 and 0.07?d <5.0; with unavoidable impurities being included).Type: ApplicationFiled: April 4, 2006Publication date: August 6, 2009Applicant: HITACHI METALS, LTD.Inventor: Shigeho Tanigawa
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Publication number: 20090085416Abstract: This invention provides a soft magnetic yoke-integrated bonded magnet in which a soft magnetic yoke has been integrally compression molded in such a state that the soft magnetic yoke is engaged in a joined face formed by bringing a binding material-containing magnetic powder into contact with a binding material-containing soft magnetic powder. The soft magnetic yoke part and the bonded magnetic part are constructed so that, when the soft magnetic yoke part and the bonded magnet part are compression molded separately from each other, the spring back level is identical upon the release of the compression force.Type: ApplicationFiled: February 28, 2007Publication date: April 2, 2009Applicant: HITACHI METALS, LTD.Inventors: Masahiro Masuzawa, Masahiro Mita, Shigeho Tanigawa, Kyohei Aimuta
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Publication number: 20060170301Abstract: A rotor comprising bonded magnet portions mainly composed of magnet powder and a binder, which are embedded in a soft magnetic portion mainly composed of soft magnetic powder and a binder, the rotor being produced by a compression-molding method, and the magnetic pole surfaces of the bonded magnet portions being embedded in the soft magnetic portion.Type: ApplicationFiled: December 7, 2004Publication date: August 3, 2006Inventors: Masahiro Masuzawa, Shigeho Tanigawa, Masahiro Mita, Keiko Kikuchi
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Patent number: 5913255Abstract: A method of producing a radially anisotropic sintered R-Fe-B-based magnet wherein R is at least one rare earth element including Y, in which a green body stack comprising a plurality of compact bodies are formed in series by the same die. The density of the compact body is regulated to 3.1 g/cm.sup.3 or more, and increased at the final compacting step to a density at least 0.2 g/cm.sup.3 higher than that before the final compacting step. By so regulating the density of the green body, the cracking during the sintering process at the binding portion, an interface between the stacked compact bodies, can be minimized while retaining high magnetic properties of the resulting magnet.Type: GrantFiled: August 7, 1997Date of Patent: June 15, 1999Assignee: Hitachi Metals Ltd.Inventors: Akira Kikuchi, Shigeho Tanigawa
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Patent number: 5472525Abstract: Disclosed is a Nd-Fe-B system magnet having coercive force iHc of 12 KOe or more and high maximum energy product (BH)max of 42 MGOe or more.The permanent magnet consists of 28 to 32 wt. % of Nd and Dy (Dy ranges from 0.4 to 3 wt. %), 6 wt. % or less of Co, 0.5 wt. % or less of Al, 0.9 to 1.3 wt. % of B, at least one of 0.05 to 2.0 wt. % of Nb and 0.05 to 2.0 wt. % of V, 0.02 to 0.5 wt. % of Ga, Fe and unavoidable impurities, having coercive force iHc of 12 KOe or more and maximum energy product (BH)max of 42 MGOe or more.Type: GrantFiled: January 28, 1994Date of Patent: December 5, 1995Assignee: Hitachi Metals, Ltd.Inventors: Masaaki Tokunaga, Shigeho Tanigawa, Masahiro Takahashi
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Patent number: 5292380Abstract: A permanent magnet having superior resistance to radioactive deterioration of magnetic properties. The magnet has a composition represented by the formula R.sub.a Fe.sub.bal. Co.sub.b B.sub.c Ga.sub. M.sub.e, in which the R denotes at least one element selected from the group consisting of Nd, Pr, Dy, Tb, Ho, and Ce, and the M denotes at least one element selected from the group consisting of Al, Si, Nb, Ta, Ti, Zr, Hf, and W, with the proviso that 12.ltoreq.a.ltoreq.18, 0.ltoreq.b.ltoreq.30, 4.ltoreq.c.ltoreq.10, 0.01.ltoreq.d.ltoreq.3 and 0.ltoreq.e.ltoreq.2 in terms of atomic percent. The permanent magnet has fine crystal grains provided with magnetic anisotropy.Type: GrantFiled: September 9, 1988Date of Patent: March 8, 1994Assignee: Hitachi Metals, Ltd.Inventors: Shigeho Tanigawa, Kimio Uchida
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Patent number: 5286308Abstract: A magnetically anistropic R-T-B magnet having crystal grains having aspect ratios of 2 or more and showing a substantially uniform maximum energy product distribution is produced by (a) rapidly quenching an alloy melt; (b) finely pulverizing the rapidly quenched alloy to provide magnetic powder; (c) mixing the magnetic powder with a carbon-containing additive; (d) coating the resulting mixture with a protective layer of a first lubricant such as BN substantially unreactive with the alloy components; (e) compressing it; (f) further coating the resulting compressed body with a second lubricant such as graphite or graphite+glass; and (g) further compressing it.Type: GrantFiled: July 13, 1992Date of Patent: February 15, 1994Assignee: Hitachi Metals Ltd.Inventors: Makoto Shinoda, Katsunori Iwasaki, Shigeho Tanigawa, Masaaki Tokunaga
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Patent number: RE38042Abstract: A the magnetically anisotropic magnetic powder having an average particle size of 1-1000 &mgr;m and made from a magnetically anisotropic R-TM-B-Ga or R-TM-B-Ga-M alloy having an average crystal grain size of 0.01-0.5 &mgr;m, wherein R represents one or more rare earth elements including Y, TM represents Fe which may be partially substituted by Co, B boron, Ga gallium, and M one or more elements selected from the group consisting of Nb, W, V, Ta, Mo, Si, Al, Zr, Hf, P, C and Zn. This is useful for anisotropic resin-bonded magnet with high magnetic properties.Type: GrantFiled: November 2, 2001Date of Patent: March 25, 2003Assignee: Hitachi Metals, Ltd.Inventors: Minoru Endoh, Yasuto Nozawa, Katsunori Iwasaki, Shigeho Tanigawa, Masaaki Tokunaga