Patents by Inventor Tetsuo Fujigaki
Tetsuo Fujigaki 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: 10658898Abstract: A method for manufacturing a neutral ring includes connecting a cut-off neutral ring to an arc-shaped connection element. The method also includes filling an insulator between the cut-off neutral ring and a connection element. The neutral ring shunts the rotor coil in three phases.Type: GrantFiled: June 19, 2018Date of Patent: May 19, 2020Assignee: Hitachi Industrial Products, Ltd.Inventors: Yasushi Hayasaka, Masanori Matsumoto, Yasunori Otsuki, Tetsuo Fujigaki, Yoshihiro Yasui, Motonobu Iizuka, Masaaki Endou, Atsushi Fukunaga, Takeshi Nakayama
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Patent number: 10389194Abstract: A permanent magnet electrical rotating machine is provided which is capable of contributing to protected permanent magnets and increased cooling performance during operation. The permanent magnet electrical rotating machine includes: permanent magnets; rotor cores that have the permanent magnets mounted thereto and are laminated in a rotating axis direction; spacers that are placed between adjacent rotor cores; and permanent magnet protection members that are installed between the permanent magnets and the rotor cores and also placed to maintain radial continuity in space partitioned by the spacers between the rotor cores.Type: GrantFiled: December 3, 2014Date of Patent: August 20, 2019Assignee: Hitachi, Ltd.Inventors: Mamoru Kimura, Masahiro Hori, Youichi Matsumoto, Tetsuo Fujigaki, Motonobu Iiduka, Yoshihiro Yasui, Eiichirou Tokizaki, Masanori Matsumoto
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Patent number: 10177621Abstract: A rotating electric machine comprises a field winding provided on a rotor iron core and a neutral ring supported independently of the field winding, wherein: the field winding and the neutral ring are electrically connected to each other through a connecting wire; the neutral ring is disposed spaced with respect to the rotor iron core; and the connecting wire absorbs the stress difference between the field winding and the neutral ring when a centrifugal stress is applied.Type: GrantFiled: August 6, 2014Date of Patent: January 8, 2019Assignee: Hitachi, Ltd.Inventors: Naoki Kunihiro, Daisuke Kori, Motonobu Iizuka, Tetsuo Fujigaki, Atsushi Fukunaga, Yasunori Otsuki, Masakatsu Sato, Masanori Matsumoto, Takeshi Nakayama, Masaaki Endo, Yoshihiro Yasui, Yasushi Hayasaka
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Publication number: 20180301952Abstract: A method for manufacturing a neutral ring includes connecting a cut-off neutral ring to an arc-shaped connection element. The method also includes filling an insulator between the cut-off neutral ring and a connection element. The neutral ring shunts the rotor coil in three phases.Type: ApplicationFiled: June 19, 2018Publication date: October 18, 2018Inventors: Yasushi HAYASAKA, Masanori MATSUMOTO, Yasunori OTSUKI, Tetsuo FUJIGAKI, Yoshihiro YASUI, Motonobu IIZUKA, Masaaki ENDOU, Atsushi FUKUNAGA, Takeshi NAKAYAMA
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Patent number: 10033237Abstract: A rotating electrical machine includes a rotor core, a rotor shaft, a coil, a bind, a lead-out wire of which one end is connected to the coil and the other end is connected to a neutral ring. A filling is filled between the coil and the neutral ring. The neutral ring is formed with a plurality of members that are connected with one another to have flexibility.Type: GrantFiled: June 30, 2015Date of Patent: July 24, 2018Assignee: Hitachi, Ltd.Inventors: Yasushi Hayasaka, Masanori Matsumoto, Yasunori Otsuki, Tetsuo Fujigaki, Yoshihiro Yasui, Motonobu Iizuka, Masaaki Endou, Atsushi Fukunaga, Takeshi Nakayama
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Patent number: 9935512Abstract: In a permanent magnet rotating electrical machine including a stator, a rotor obtained by stacking a plurality of rotor cores arranged with magnet insertion holes in layers with gaps, and permanent magnets inserted to the magnet insertion holes, the magnet insertion holes are formed on both sides of the duct piece so as to depart from the duct piece disposed between the rotor cores as the magnet insertion holes extend from the side of the center of the rotor core to the outer circumference side, the magnet insertion holes are disposed so as to shift from the duct piece in the circumferential direction of the rotor, and inner circumference side voids having the length in the circumferential direction wider than the thickness in the circumferential direction of the permanent magnets are provided from the inner circumference side ends of the permanent magnets toward the duct piece.Type: GrantFiled: December 2, 2014Date of Patent: April 3, 2018Assignee: Hitachi, Ltd.Inventors: Mamoru Kimura, Masahiro Hori, Tetsuo Fujigaki, Youichi Matsumoto, Motonobu Iiduka
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Publication number: 20170155292Abstract: A permanent magnet electrical rotating machine is provided which is capable of contributing to protected permanent magnets and increased cooling performance during operation. The permanent magnet electrical rotating machine includes: permanent magnets; rotor cores that have the permanent magnets mounted thereto and are laminated in a rotating axis direction; spacers that are placed between adjacent rotor cores; and permanent magnet protection members that are installed between the permanent magnets and the rotor cores and also placed to maintain radial continuity in space partitioned by the spacers between the rotor cores.Type: ApplicationFiled: December 3, 2014Publication date: June 1, 2017Inventors: Mamoru KIMURA, Masahiro HORI, Youichi MATSUMOTO, Tetsuo FUJIGAKI, Motonobu IIDUKA, Yoshihiro YASUI, Eiichirou TOKIZAKI, Masanori MATSUMOTO
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Publication number: 20170117769Abstract: A rotating electric machine comprises a field winding provided on a rotor iron core and a neutral ring supported independently of the field winding, wherein: the field winding and the neutral ring are electrically connected to each other through a connecting wire; the neutral ring is disposed spaced with respect to the rotor iron core; and the connecting wire absorbs the stress difference between the field winding and the neutral ring when a centrifugal stress is applied.Type: ApplicationFiled: August 6, 2014Publication date: April 27, 2017Inventors: Naoki KUNIHIRO, Daisuke KORI, Motonobu IIZUKA, Tetsuo FUJIGAKI, Atsushi FUKUNAGA, Yasunori OTSUKI, Masakatsu SATO, Masanori MATSUMOTO, Takeshi NAKAYAMA, Masaaki ENDO, Yoshihiro YASUI, Yasushi HAYASAKA
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Patent number: 9484793Abstract: An electrical rotating machine system that can be easily maintained and can provide improved power generation efficiency. The electrical rotating machine system includes: a first electrical rotating machine having a first stator that has first stator windings, and a first rotor that has first rotor windings and is disposed on the internal diameter side of the first stator so as to have a gap between the internal diameter side of the first stator and the first rotor itself; a second electrical rotating machine having a second stator that has second stator windings, and a second rotor that has second rotor windings and is disposed on the internal diameter side of the second stator so as to have a gap between the internal diameter side of the second stator and the second rotor itself; and at least one power converter that is electrically connected to the first rotor windings and the second rotor windings, and configured to rotate when the first rotor rotates.Type: GrantFiled: October 24, 2012Date of Patent: November 1, 2016Assignee: Hitachi, Ltd.Inventors: Mamoru Kimura, Nobuhiro Kusuno, Tomomichi Ito, Tetsuo Fujigaki, Daisuke Kori, Motonobu Iizuka, Akiyoshi Komura
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Publication number: 20160043603Abstract: A rotating electrical machine includes a rotor core, a rotor shaft, a coil, a bind, a lead-out wire of which one end is connected to the coil and the other end is connected to a neutral ring. A filling is filled between the coil and the neutral ring. The neutral ring is formed with a plurality of members that are connected with one another to have flexibility.Type: ApplicationFiled: June 30, 2015Publication date: February 11, 2016Inventors: Yasushi HAYASAKA, Masanori MATSUMOTO, Yasunori OTSUKI, Tetsuo FUJIGAKI, Yoshihiro YASUI, Motonobu IIZUKA, Masaaki ENDOU, Atsushi FUKUNAGA, Takeshi NAKAYAMA
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Patent number: 9225213Abstract: An electrical rotating machine includes: a rotating shaft; a rotor, equipped with permanent magnets, and formed to rotate with the rotating shaft, a stator disposed in opposition on an outside-diametral side and via a clearance with respect to the rotor; and anti-demagnetization conductors extending in the axial direction of the shaft, the conductors each being disposed inside the rotor, wherein: the anti-demagnetization conductors are provided in pairs of two for each of magnetic poles of the rotor; the two anti-demagnetization conductors forming a pair are electrically interconnected; and, inside the rotor, the two paired anti-demagnetization conductors are disposed at different-polarity sides of two corresponding permanent magnets in a circumferential direction of the rotor, the different-polarity sides each being more adjacent to the circumferential direction of the rotor than to an end portion of one of the two corresponding permanent magnets existing close to each other in one magnetic pole.Type: GrantFiled: June 27, 2013Date of Patent: December 29, 2015Assignee: Hitachi, Ltd.Inventors: Mamoru Kimura, Akiyoshi Komura, Daisuke Kori, Tetsuo Fujigaki, Motonobu Iizuka
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Publication number: 20150194851Abstract: In a permanent magnet rotating electrical machine including a stator, a rotor obtained by stacking a plurality of rotor cores arranged with magnet insertion holes in layers with gaps, and permanent magnets inserted to the magnet insertion holes, the magnet insertion holes are formed on both sides of the duct piece so as to depart from the duct piece disposed between the rotor cores as the magnet insertion holes extend from the side of the center of the rotor core to the outer circumference side, the magnet insertion holes are disposed so as to shift from the duct piece in the circumferential direction of the rotor, and inner circumference side voids having the length in the circumferential direction wider than the thickness in the circumferential direction of the permanent magnets are provided from the inner circumference side ends of the permanent magnets toward the duct piece.Type: ApplicationFiled: December 2, 2014Publication date: July 9, 2015Inventors: Mamoru KIMURA, Masahiro HORI, Tetsuo FUJIGAKI, Youichi MATSUMOTO, Motonobu IIDUKA
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Patent number: 8653703Abstract: The permanent magnet rotating electric machine comprising a stator with a stator coil wound on a stator iron core, a rotor with a plurality of permanent magnets disposed in the circumferential direction in a rotor iron core, which is disposed opposite to the stator iron core of the stator with a predetermined spacing therebetween and is fixed to a shaft, a water-cooling unit disposed around the outer circumference of the stator iron core, and a fan fixed to the shaft on the same side as at least one axial end of the rotor iron core to circulate cooling air in the permanent magnet rotating electric machine; further comprising ventilation paths, through which the cooling air flows, formed around the outer circumference of the water-cooling unit; wherein after the cooling air has been circulated by the fan in the machine for cooling, the cooling air is led to the ventilation paths to perform heat exchange between the cooling air flowing in the ventilation paths and the water-cooling unit, after which the coolType: GrantFiled: February 17, 2011Date of Patent: February 18, 2014Assignee: Hitachi, Ltd.Inventors: Daisuke Kori, Shogo Serita, Tetsuo Fujigaki, Masaaki Endo, Yoshihiro Yasui, Ai Nagano, Mamoru Kimura, Motonobu Iizuka, Akiyoshi Komura
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Publication number: 20140001912Abstract: An electrical rotating machine includes: a rotating shaft; a rotor, equipped with permanent magnets, and formed to rotate with the rotating shaft, a stator disposed in opposition on an outside-diametral side and via a clearance with respect to the rotor; and anti-demagnetization conductors extending in the axial direction of the shaft, the conductors each being disposed inside the rotor, wherein: the anti-demagnetization conductors are provided in pairs of two for each of magnetic poles of the rotor; the two anti-demagnetization conductors forming a pair are electrically interconnected; and, inside the rotor, the two paired anti-demagnetization conductors are disposed at different-polarity sides of two corresponding permanent magnets in a circumferential direction of the rotor, the different-polarity sides each being more adjacent to the circumferential direction of the rotor than to an end portion of one of the two corresponding permanent magnets existing close to each other in one magnetic pole.Type: ApplicationFiled: June 27, 2013Publication date: January 2, 2014Inventors: Mamoru KIMURA, Akiyoshi KOMURA, Daisuke KORI, Tetsuo FUJIGAKI, Motonobu IIZUKA
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Publication number: 20130340256Abstract: A bearing replacement method for a rotating machine of the present invention includes the steps of: when at least one bearing of a rotating machine is to be replaced with a new one, mounting at an end portion of the rotating machine a plurality of bendable arms for removing a first bearing covering part, a power supply unit outer frame, and a slipring, respectively; removing with the arms the first bearing covering part, the power supply unit outer frame, and the slipring, respectively; and thereafter replacing the at least one bearing with a new one.Type: ApplicationFiled: June 18, 2013Publication date: December 26, 2013Inventors: Osamu TSUCHITANI, Motonobu IIZUKA, Shuji MIZUTANI, Tetsuo FUJIGAKI, Masaaki ENDO, Yoshihiro YASUI, Shogo SERITA, Masakazu SHINDEN
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Patent number: 8546991Abstract: A synchronous generator 1 including a rotor having a field winding placed in the slots thereof and a stator having an armature winding placed in the slots thereof, wherein the value of the number of slots per two poles in stator minus the number of slots per two poles in rotor is equal to or greater than +9, or equal to or smaller than ?9.Type: GrantFiled: July 22, 2009Date of Patent: October 1, 2013Assignee: Hitachi, Ltd.Inventors: Masanori Sawahata, Kazuo Nishihama, Hiroyuki Mikami, Tetsuo Fujigaki, Motonobu Iizuka, Shuji Mizutani
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Publication number: 20110241350Abstract: The permanent magnet rotating electric machine comprising a stator with a stator coil wound on a stator iron core, a rotor with a plurality of permanent magnets disposed in the circumferential direction in a rotor iron core, which is disposed opposite to the stator iron core of the stator with a predetermined spacing therebetween and is fixed to a shaft, a water-cooling unit disposed around the outer circumference of the stator iron core, and a fan fixed to the shaft on the same side as at least one axial end of the rotor iron core to circulate cooling air in the permanent magnet rotating electric machine; further comprising ventilation paths, through which the cooling air flows, formed around the outer circumference of the water-cooling unit; wherein after the cooling air has been circulated by the fan in the machine for cooling, the cooling air is led to the ventilation paths to perform heat exchange between the cooling air flowing in the ventilation paths and the water-cooling unit, after which the coolingType: ApplicationFiled: February 17, 2011Publication date: October 6, 2011Inventors: Daisuke KORI, Shogo Serita, Tetsuo Fujigaki, Masaaki Endo, Yoshihiro Yasui, Ai Nagano, Mamoru Kimura, Motonobu Ilzuka, Akiyoshi Komura
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Patent number: 7994666Abstract: A permanent magnet electrical rotating machine having a permanent magnet rotor and a stator, wherein: a plurality of permanent magnets are disposed in a rotor iron core of the permanent magnet rotor along a periphery of the rotor iron core, polarities thereof being alternately changed; a cooling airflow channel is formed between each pair of adjacent opposite poles on the rotor iron core; and the cooling airflow channel has an approximately trapezoidal shape on an outer periphery side of the rotor iron core; and extends from an end on a central side in a radial direction of the approximately trapezoidal shape to a radial center.Type: GrantFiled: November 21, 2007Date of Patent: August 9, 2011Assignee: Hitachi, Ltd.Inventors: Daisuke Kori, Tetsuo Fujigaki, Shuji Aizawa, Motonobu Iizuka, Yasushi Iwai, Hiroyuki Mikami, Mamoru Kimura
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Patent number: 7847456Abstract: A permanent magnet electrical rotating machine having a permanent magnet rotor and a stator, wherein: a plurality of permanent magnets are disposed in a rotor iron core of the permanent magnet rotor along a periphery of the rotor iron core, polarities thereof being alternately changed; a cooling airflow channel is formed between each pair of adjacent opposite poles on the rotor iron core; and the cooling airflow channel has an approximately trapezoidal shape on an outer periphery side of the rotor iron core; and extends from an end on a central side in a radial direction of the approximately trapezoidal shape to a radial center.Type: GrantFiled: April 5, 2010Date of Patent: December 7, 2010Assignee: Hitachi, Ltd.Inventors: Daisuke Kori, Tetsuo Fujigaki, Shuji Aizawa, Motonobu Iizuka, Yasushi Iwai, Hiroyuki Mikami, Mamoru Kimura
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Publication number: 20100194221Abstract: A permanent magnet electrical rotating machine having a permanent magnet rotor and a stator, wherein: a plurality of permanent magnets are disposed in a rotor iron core of the permanent magnet rotor along a periphery of the rotor iron core, polarities thereof being alternately changed; a cooling airflow channel is formed between each pair of adjacent opposite poles on the rotor iron core; and the cooling airflow channel has an approximately trapezoidal shape on an outer periphery side of the rotor iron core; and extends from an end on a central side in a radial direction of the approximately trapezoidal shape to a radial center.Type: ApplicationFiled: April 5, 2010Publication date: August 5, 2010Inventors: Daisuke KORI, Tetsuo Fujigaki, Shuji Aizawa, Motonobu Iizuka, Yasushi Iwai, Hiroyuki Mikami, Mamoru Kimura