Patents by Inventor Hiroyasu Yumura
Hiroyasu Yumura 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: 7614243Abstract: A method of operating a superconducting cable using a conductor cooled by a refrigerant to transmit electric power causes a change in the refrigerant temperature to change the transmission capacity of a superconducting cable(110, 120, 130). Since superconducting materials are capable of increasing the value of their critical current as the temperature decreases, the refrigerant temperature may be changed to change the transmission capacity of the superconducting cable (110, 120, 130) without overdesigning of cabling or an additional cable.Type: GrantFiled: September 9, 2004Date of Patent: November 10, 2009Assignee: Sumitomo Electric Industries, Ltd.Inventors: Takato Masuda, Hiroyasu Yumura
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Patent number: 7598458Abstract: A superconducting cable according to the present invention includes a former, a superconducting conductor layer formed around the outer circumference of the former, an electric insulating layer formed around the outer circumference of the conductor layer, a shield layer formed around the outer circumferential of the insulating layer, and a normal-conducting metal layer formed between the insulating layer and the shield layer. The normal-conducting metal layer existing inside shield layer has an inductance greater than that of the shield layer, which can suppress a rise in temperature in the event of accidents such as short-circuits, and also can reduce AC losses since currents flow through shield layer during the passage of normal currents.Type: GrantFiled: September 9, 2004Date of Patent: October 6, 2009Assignee: Sumitomo Electric Industries, Ltd.Inventors: Hiroyasu Yumura, Masanobu Nishimura
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Patent number: 7439448Abstract: A phase split structure of a superconducting cable includes three cable cores each having a shield layer provided around a superconductor, a splitter box housing the three cable cores extending from an assembly portion where the three cable cores are assembled into the cable, in a state in which the cable cores are spaced apart from each other, and an electrically-conductive connecting portion connecting respective shield layers of the cable cores to each other within the splitter box. In this way, occurrence of a large magnetic field outside the cable cores can effectively be reduced.Type: GrantFiled: May 7, 2004Date of Patent: October 21, 2008Assignees: Sumitomo Electric Industries, Ltd., The Tokyo Electric Power Company IncorporatedInventors: Takato Masuda, Hiroyasu Yumura, Yoshihisa Takahashi, Kimiyoshi Matsuo, Shoichi Honjo, Tomoo Mimura
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Patent number: 7211723Abstract: A phase separation jig (100) for a superconducting cable includes: a cable holder (10) maintaining each core (80) of a multi-core superconducting cable (2) in a predetermined tolerable bending manner; and a coupler (20, 30) holding the cable holder (10) for each core (80) at a predetermined spacing with each other. Each core (80) is spaced apart from each other and maintained in a tolerable bending manner by the holder (10). Accordingly, a phase separation structure can be obtained which can regulate deformation of the cable and prevent abnormal deformation even for a superconducting cable.Type: GrantFiled: June 21, 2002Date of Patent: May 1, 2007Assignees: Sumitomo Electric Industries, Ltd., The Tokyo Electric Power Company IncorporatedInventors: Masayuki Hirose, Hiroyasu Yumura, Takeshi Kato, Yoshihisa Takahashi, Kimiyoshi Matsuo, Shoichi Honjo, Tomoo Mimura
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Patent number: 7166804Abstract: The present invention provides a terminal structure of a superconducting cable including a cable core having a superconducting shield layer and an electrical insulation layer. The superconducting shield layer has a radially outer portion provided with by a connection electrode and the superconducting shield layer and the connection electrode are connected together with a low melting solder. The connection electrode has a ground wire connected thereto to ground the superconducting shield layer. For a multiphase cable including a plurality of cable cores, connection electrodes are linked by a conductive coupling member to short circuit superconducting shield layers. The superconducting shield layer can be grounded without impaired insulating property of the electrical insulation layer.Type: GrantFiled: September 23, 2004Date of Patent: January 23, 2007Assignee: Sumitomo Electric Industries, Ltd.Inventors: Hiroyasu Yumura, Yoshihisa Takahashi, Kimiyoshi Matsuo, Shoichi Honjo, Tomoo Mimura
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Patent number: 7148423Abstract: A phase split structure of a superconducting cable includes three cable cores each having a shield layer provided around a superconductor, a splitter box housing the three cable cores extending from an assembly portion where the three cable cores are assembled into the cable, in a state in which the cable cores are spaced apart from each other, and a shield connecting portion connecting respective shield layers of the cable cores to each other within the splitter box. The shield connecting portion allows the cable cores to have their respective shield layers connected together with low resistance and each shield layer can pass a current substantially equal in magnitude to that which each superconductor passes. Thus in each shield layer a magnetic field can be formed having a level that can cancel a magnetic field generated from each superconductor. The structure can thus effectively prevent a large magnetic field external to the cable core.Type: GrantFiled: June 8, 2004Date of Patent: December 12, 2006Assignees: Sumitomo Electric Industries, Ltd, The Tokyo Electric Power Company IncorporatedInventors: Takato Masuda, Hiroyasu Yumura, Yoshihisa Takahashi, Shoichi Honjo, Keisuke Etoh
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Publication number: 20060180328Abstract: A method of operating a superconducting cable using a conductor cooled by a refrigerant to transmit electric power causes a change in the refrigerant temperature to change the transmission capacity of a superconducting cable. Since superconducting materials are capable of increasing the value of their critical current as the temperature decreases, the refrigerant temperature may be changed to change the transmission capacity of the superconducting cable without overdesigning of cabling or an additional cable.Type: ApplicationFiled: September 9, 2004Publication date: August 17, 2006Inventors: Takato Masuda, Hiroyasu Yumura
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Patent number: 7091423Abstract: A superconducting cable has a plurality of superconducting wires wound around a core material (former) in a multilayered manner. The superconducting wires employ a twisted filament type superconducting wire having spiral superconducting filaments and an untwisted filament type superconducting wire having straight superconducting filaments. The layer in which an applied magnetic field is large and of which the low loss effect is expected is formed of twisted filament type superconducting wires, and the other layers are formed using the untwisted filament type superconducting wires; thus the AC loss can be reduced effectively. Thus, in the superconducting cable, the AC loss can be effectively reduced while a degradation of the current characteristics and the increase of cost are suppressed.Type: GrantFiled: April 7, 2004Date of Patent: August 15, 2006Assignee: Sumitomo Electric Industries, Ltd.Inventors: Hiroyasu Yumura, Naoki Ayai
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Publication number: 20060175078Abstract: A superconducting cable according to the present invention includes a former, a superconducting conductor layer formed around the outer circumference of the former, an electric insulating layer formed around the outer circumference of the conductor layer, a shield layer formed around the outer circumferential of the insulating layer, and a normal-conducting metal layer formed between the insulating layer and the shield layer. The normal-conducting metal layer existing inside shield layer has an inductance greater than that of the shield layer, which can suppress a rise in temperature in the event of accidents such as short-circuits, and also can reduce AC losses since currents flow through shield layer during the passage of normal currents.Type: ApplicationFiled: September 9, 2004Publication date: August 10, 2006Inventors: Hiroyasu Yumura, Masanobu Nishimura
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Publication number: 20050061537Abstract: The present invention provides a terminal structure of a superconducting cable including a cable core having a superconducting shield layer and an electrical insulation layer. The superconducting shield layer has a radially outer portion provided with by a connection electrode and the superconducting shield layer and the connection electrode are connected together with a low melting solder. The connection electrode has a ground wire connected thereto to ground the superconducting shield layer. For a multiphase cable including a plurality of cable cores, connection electrodes are linked by a conductive coupling member to short circuit superconducting shield layers. The superconducting shield layer can be grounded without impaired insulating property of the electrical insulation layer.Type: ApplicationFiled: September 23, 2004Publication date: March 24, 2005Inventors: Hiroyasu Yumura, Yoshihisa Takahashi, Kimiyoshi Matsuo, Shoichi Honjo, Tomoo Mimura
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Publication number: 20040256142Abstract: A phase split structure of a superconducting cable includes three cable cores each having a shield layer provided around a superconductor, a splitter box housing the three cable cores extending from an assembly portion where the three cable cores are assembled into the cable, in a state in which the cable cores are spaced apart from each other, and an electrically-conductive connecting portion connecting respective shield layers of the cable cores to each other within the splitter box. In this way, occurrence of a large magnetic field outside the cable cores can effectively be reduced.Type: ApplicationFiled: May 7, 2004Publication date: December 23, 2004Applicants: Sumitomo Electric Industries, Ltd., The Tokyo Electric Power Company, IncorporatedInventors: Takato Masuda, Hiroyasu Yumura, Yoshihisa Takahashi, Kimiyoshi Matsuo, Shoichi Honjo, Tomoo Mimura
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Publication number: 20040256144Abstract: A phase split structure of a superconducting cable includes three cable cores each having a shield layer provided around a superconductor, a splitter box housing the three cable cores extending from an assembly portion where the three cable cores are assembled into the cable, in a state in which the cable cores are spaced apart from each other, and a shield connecting portion connecting respective shield layers of the cable cores to each other within the splitter box. The shield connecting portion allows the cable cores to have their respective shield layers connected together with low resistance and each shield layer can pass a current substantially equal in magnitude to that which each superconductor passes. Thus in each shield layer a magnetic field can be formed having a level that can cancel a magnetic field generated from each superconductor. The structure can thus effectively prevent a large magnetic field external to the cable core.Type: ApplicationFiled: June 8, 2004Publication date: December 23, 2004Applicants: Sumitomo Electric Industries, Ltd., The Tokyo Electric Power Company, IncorporatedInventors: Takato Masuda, Hiroyasu Yumura, Yoshihisa Takahashi, Shoichi Honjo, Keisuke Etoh
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Publication number: 20040200637Abstract: A superconducting cable has a plurality of superconducting wires wound around a core material (former) in a multilayered manner. The superconducting wires employ a twisted filament type superconducting wire having spiral superconducting filaments and an untwisted filament type superconducting wire having straight superconducting filaments. The layer in which an applied magnetic field is large and of which the low loss effect is expected is formed of twisted filament type superconducting wires, and the other layers are formed using the untwisted filament type superconducting wires; thus the AC loss can be reduced effectively. Thus, in the superconducting cable, the AC loss can be effectively reduced while a degradation of the current characteristics and the increase of cost are suppressed.Type: ApplicationFiled: April 7, 2004Publication date: October 14, 2004Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Hiroyasu Yumura, Naoki Ayai
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Publication number: 20040173365Abstract: A phase separation jig (100) for a superconducting cable includes: a cable holder (10) maintaining each core (80) of a multi-core superconducting cable (2) in a predetermined tolerable bending manner; and a coupler (20, 30) holding the cable holder (10) for each core (80) at a predetermined spacing with each other. Each core (80) is spaced apart from each other and maintained in a tolerable bending manner by the holder (10). Accordingly, a phase separation structure can be obtained which can regulate deformation of the cable and prevent abnormal deformation even for a superconducting cable.Type: ApplicationFiled: December 18, 2003Publication date: September 9, 2004Inventors: Masayuki Hirose, Hiroyasu Yumura, Takeshi Kato, Yoshihisa Takahashi, Kimiyoshi Matsuo, Shoichi Honjo, Tomoo Mimura
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Patent number: 6552260Abstract: A superconducting cable includes a core material, conductor layers formed by means of helically winding superconducting wires around the core material, electrically insulating layers, and magnetic shielding layers formed by means of helically winding superconducting wires around each of the electrically shielding layers. The superconducting wire is wound at the shortest pitch on the outermost conductor layer and is wound at the longest pitch on the outermost magnetic shielding layer.Type: GrantFiled: January 12, 2001Date of Patent: April 22, 2003Assignees: Sumitomo Electric Industries, Ltd., Tokyo Electric Power CompanyInventors: Jun Fujikami, Toru Okazaki, Takato Masuda, Takeshi Kato, Hiroyasu Yumura, Yoshihisa Takahashi, Kimiyoshi Matsuo, Shoichi Honjo, Tomoo Mimura
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Publication number: 20010054509Abstract: A superconducting cable includes a core material, conductor layers formed by means of helically winding superconducting wires around the core material, electrically insulating layers, and magnetic shielding layers formed by means of helically winding superconducting wires around each of the electrically shielding layers. The superconducting wire is wound at the shortest pitch on the outermost conductor layer and is wound at the longest pitch on the outermost magnetic shielding layer.Type: ApplicationFiled: January 12, 2001Publication date: December 27, 2001Inventors: Jun Fujikami, Toru Okazaki, Takato Masuda, Takeshi Kato, Hiroyasu Yumura, Yoshihisa Takahashi, Kimiyoshi Matsuo, Shoichi Honjo, Tomoo Mimura