Patents by Inventor Masataka Iwakuma
Masataka Iwakuma 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: 20220216779Abstract: An object of the invention is to provide a superconducting induction rotating machine that is smaller, more power-saving for its operation, and widely applicable as a propulsion generation system.Type: ApplicationFiled: April 24, 2020Publication date: July 7, 2022Inventors: Masataka IWAKUMA, Teruo IZUMI
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Patent number: 8880135Abstract: The present invention is configured such that, in a low AC loss oxide superconductor constituted by providing an oxide superconducting layer 6 on a substrate 1, said oxide superconducting layer 6 is separated into a plurality of filament conductors 2 in parallel to the lengthwise direction of said substrate 1 by dividing grooves 3 plurally formed in the widthwise direction of said substrate, and a high-resistance oxide 8 is formed in said dividing grooves 3. Because of the invention, it is possible to increase the insulation properties of individually divided mated filament conductors, and to obtain an oxide superconductor that has low AC loss.Type: GrantFiled: November 16, 2006Date of Patent: November 4, 2014Assignees: Railway Technical Research Institute, International Superconductivity Technology Center, the Juridical Foundation, Kyushu University, National University CorporationInventors: Kenji Suzuki, Saburo Hoshi, Junko Matsuda, Teruo Izumi, Yuh Shiohara, Masataka Iwakuma
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Publication number: 20120035055Abstract: Problem: To provide an REBCO superconductor which has electromagnetic properties of an extremely small magnetization in a DC magnetic field or an extremely small pinning loss in a fluctuating magnetic field and thereby enable production of a REBCO superconducting wire with an extremely small magnetization and pinning loss. Solution to Problem: A RE1Ba2Cu3O7-z superconductor characterized by having a magnetization-zero-region on its magnetization curve, wherein in the magnetization-zero-region a rate of change of magnetization remains at about zero near zero magnetization, the magnetization curve is formed when an external magnetic field turns from an increase to a decrease or from a decrease to an increase, and RE is one or more of Y, Gd, Nd, Sm, Eu, Yb, Pr, and Ho.Type: ApplicationFiled: June 7, 2011Publication date: February 9, 2012Inventors: Masataka IWAKUMA, Akira Ibi, Teruo Izumi, Yuh Shiohara
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Patent number: 7777602Abstract: Tape-shaped superconducting wires, and a superconducting coil formed from said wires, wherein a plurality of electrically separated superconducting film parts, each having a rectangular cross section and arranged in parallel, form parallel conductors, providing superconducting wires capable of containing losses incurred in the presence of alternating current (A/C). A superconducting coil is made by winding the superconducting wires, wherein the coil structure contains at least a part wherein perpendicular interlinkage magnetic fluxes acting among conductor elements of the parallel conductors by the distribution of magnetic fields generated by the superconducting coils cancel mutually in order to contain circulating current within the wires and to make shunt current uniform, thereby providing a low-loss A/C superconducting coil.Type: GrantFiled: October 3, 2008Date of Patent: August 17, 2010Assignees: International Superconductivity Technology Center, Juridical Foundation, Fuji Electric Systems Co., Ltd., Fujikura Ltd.Inventors: Kazuo Funaki, Masataka Iwakuma, Takanobu Kisu, Akira Tomioka, Toshio Uede, Hiroshi Fuji, Teruo Izumi, Yuh Shiohara
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Publication number: 20090170708Abstract: Tape-shaped superconducting wires, and a superconducting coil formed from said wires, wherein a plurality of electrically separated superconducting film parts, each having a rectangular cross section and arranged in parallel, form parallel conductors, providing superconducting wires capable of containing losses incurred in the presence of alternating current (A/C). A superconducting coil is made by winding the superconducting wires, wherein the coil structure contains at least a part wherein perpendicular interlinkage magnetic fluxes acting among conductor elements of the parallel conductors by the distribution of magnetic fields generated by the superconducting coils cancel mutually in order to contain circulating current within the wires and to make shunt current uniform, thereby providing a low-loss A/C superconducting coil.Type: ApplicationFiled: October 3, 2008Publication date: July 2, 2009Applicants: INTERNATIONAL SUPERCONDUCTIVITY TECHNOLOGY CENTER, THE JURIDICIAL FOUNDATION, FUJI ELECTRIC SYSTEMS CO., LTD., FUJIKURA LTD., KAZUO FUNAKI, MASATAKA IWAKUMA, TAKANOBU KISUInventors: Kazuo Funaki, Masataka Iwakuma, Takanobu Kisu, Akira Tomioka, Toshio Uede, Hiroshi Fuji, Teruo Izumi, Yuh Shiohara
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Patent number: 7453340Abstract: Tape-shaped superconducting wires, and a superconducting coil formed from said wires, wherein a plurality of electrically separated superconducting film parts, each having a rectangular cross section and arranged in parallel, form parallel conductors, providing superconducting wires capable of containing losses incurred in the presence of alternating current (A/C). A superconducting coil is made by winding the superconducting wires, wherein the coil structure contains at least a part wherein perpendicular interlinkage magnetic fluxes acting among conductor elements of the parallel conductors by the distribution of magnetic fields generated by the superconducting coils cancel mutually in order to contain circulating current within the wires and to make shunt current uniform, thereby providing a low-loss A/C superconducting coil.Type: GrantFiled: July 13, 2004Date of Patent: November 18, 2008Assignees: International Superconductivity Technology Center, The Juridical Foundation, Fuji Electric Systems Co., Ltd., Fujikura Ltd.Inventors: Kazuo Funaki, Masataka Iwakuma, Takanobu Kisu, Akira Tomioka, Toshio Uede, Hiroshi Fuji, Teruo Izumi, Yuh Shiohara
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Patent number: 7394338Abstract: In one embodiment, a superconducting coil includes a tertiary parallel superconductor unit (60) composed of superposed in parallel a plurality of layers of secondary parallel superconductor units (50). The layers of secondary parallel superconductor units include a plurality of superconductor elements (40) arranged in parallel along the axial direction of the coil, forming a superconducting conductor unit. The tertiary parallel superconductor unit is wound on a bobbin (55). In another embodiment, the superconducting coil includes one or more layers of the secondary parallel superconductor unit wound on the bobbin. In both embodiments, the secondary parallel superconductor unit can include at least one non-superconducting conductor element (70). The layer of the secondary parallel superconductor unit forming an outer side of the tertiary parallel superconductor unit can include at least one non-superconducting conductor element.Type: GrantFiled: January 12, 2006Date of Patent: July 1, 2008Assignees: Fuji Electric Systems Co., Ltd., Fujikura Ltd., Railway Technical Research Institute, Superconductivity Research Laboratory, International Superconductivity Technology Center, The Juridical Foundation, Kyushu Electric Power Co., Inc.Inventors: Masataka Iwakuma, Akira Tomioka, Masayuki Konno, Hiroshi Fuji, Kenji Suzuki, Teruo Izumi, Yuh Shiohara, Hidemi Hayashi
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Publication number: 20070145100Abstract: The present invention is configured such that, in a low AC loss oxide superconductor constituted by providing an oxide superconducting layer 6 on a substrate 1, said oxide superconducting layer 6 is separated into a plurality of filament conductors 2 in parallel to the lengthwise direction of said substrate 1 by dividing grooves 3 plurally formed in the widthwise direction of said substrate, and a high-resistance oxide 8 is formed in said dividing grooves 3. Because of the invention, it is possible to increase the insulation properties of individually divided mated filament conductors, and to obtain an oxide superconductor that has low AC loss.Type: ApplicationFiled: November 16, 2006Publication date: June 28, 2007Applicants: RAILWAY TECHNICAL RESEARCH INSTITUTE, International Superconductivity Technology Center, the Juridical Foundation Eishin Kaihatsu BLDG, Kyushu University, National University CorporationInventors: Kenji Suzuki, Saburo Hoshi, Junko Matsuda, Teruo Izumi, Yuh Shiohara, Masataka Iwakuma
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Publication number: 20060238928Abstract: In one embodiment, a superconducting coil includes a tertiary parallel superconductor unit (60) composed of superposed in parallel a plurality of layers of secondary parallel superconductor units (50). The layers of secondary parallel superconductor units include a plurality of superconductor elements (40) arranged in parallel along the axial direction of the coil, forming a superconducting conductor unit. The tertiary parallel superconductor unit is wound on a bobbin (55). In another embodiment, the superconducting coil includes one or more layers of the secondary parallel superconductor unit wound on the bobbin. In both embodiments, the secondary parallel superconductor unit can include at least one non-superconducting conductor element (70). The layer of the secondary parallel superconductor unit forming an outer side of the tertiary parallel superconductor unit can include at least one non-superconducting conductor element.Type: ApplicationFiled: January 12, 2006Publication date: October 26, 2006Applicants: Fuji Electric Systems Co., Ltd., Fujikura Ltd., Railway Technical Research Institute, The Juridical Foundation, Kyushu Electric Power Co., Inc.Inventors: Masataka Iwakuma, Akira Tomioka, Masayuki Konno, Hiroshi Fuji, Kenji Suzuki, Teruo Izumi, Yuh Shiohara, Hidemi Hayashi
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Publication number: 20060077025Abstract: Tape-shaped superconducting wires are made by forming a superconducting film on the substrate. At least the superconducting film is slit, electrically separated into a plurality of superconducting film parts each having a rectangular cross section and arranged in parallel to form parallel conductors. This provides superconducting wires capable of containing AC loss. A superconducting coil is made by winding the superconducting wires described above, wherein the provision of a coil structure containing at least partially a part wherein the perpendicular interlinkage magnetic flux acting among various conductor elements of the parallel conductors by the distribution of the magnetic field generated by the superconducting coils cancel mutually enables a simple structure without transposition to cancel mutually the interlinkage magnetic flux by the perpendicular magnetic field against wires, to contain circulating current within the wires by the perpendicular magnetic field and to make shunt current uniform.Type: ApplicationFiled: July 13, 2004Publication date: April 13, 2006Inventors: Kazuo Funaki, Masataka Iwakuma, Takanobu Kisu, Akira Tomioka, Toshio Uede, Hiroshi Fuji, Teruo Izumi, Yuh Shiohara