Patents by Inventor Motonobu Iizuka
Motonobu Iizuka 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: 11598694Abstract: The present invention provides an abnormality diagnosis system capable of identifying an abnormality occurrence site in a rotary electric machine by use of output of sensors mounted to a bearing of the rotary electric machine. The abnormality diagnosis system includes: a rotary electric machine that has a main shaft secured to a center of a rotor and supported by a bearing; a vibration sensor that measures a vibration value of the bearing; a speed sensor that measures a rotational speed value of the main shaft; and an abnormality diagnosis apparatus that diagnoses abnormality in the rotary electric machine based on the vibration value and the rotational speed value.Type: GrantFiled: January 15, 2020Date of Patent: March 7, 2023Assignee: Hitachi Industrial Products, Ltd.Inventors: Shuhei Ayukawa, Yasushi Hayasaka, Motonobu Iizuka, Takeki Hara, Masaaki Endo, Atsushi Fukunaga
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Publication number: 20220074814Abstract: The present invention provides an abnormality diagnosis system capable of identifying an abnormality occurrence site in a rotary electric machine by use of output of sensors mounted to a bearing of the rotary electric machine. The abnormality diagnosis system includes: a rotary electric machine that has a main shaft secured to a center of a rotor and supported by a bearing; a vibration sensor that measures a vibration value of the bearing; a speed sensor that measures a rotational speed value of the main shaft; and an abnormality diagnosis apparatus that diagnoses abnormality in the rotary electric machine based on the vibration value and the rotational speed value.Type: ApplicationFiled: January 15, 2020Publication date: March 10, 2022Inventors: Shuhei AYUKAWA, Yasushi HAYASAKA, Motonobu IIZUKA, Takeki HARA, Masaaki ENDO, Atsushi FUKUNAGA
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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: 10243430Abstract: The invention provides a rotating electrical machine system in which an air volume of a refrigerant is increased near the center of a rotating electrical machine in the axial direction is improved. The rotating electrical machine includes a rotor and a stator, in which the stator core, laminated electromagnetic steel sheets formed by laminating a plurality of electromagnetic steel sheets in the axial direction are divided into a plurality of sets of packet cores, and between one of the packet cores of the plurality of sets and another packet core adjacent to it, there is formed a duct providing a flow channel of the stator, and in a duct situated at the center side from both ends in the axial direction among the duct, there is a portion of two packet cores facing each other across the duct, a diameter direction length of the two packet cores becoming long.Type: GrantFiled: December 16, 2016Date of Patent: March 26, 2019Assignee: Hitachi, Ltd.Inventors: Daisuke Kori, Ryuichiro Iwano, Masanori Sawahata, Kazuo Nishihama, Motonobu Iizuka, Takayuki Koyama, Kenichi Sugimoto
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Patent number: 10199900Abstract: The present invention provides a rotating machine which can maintain good contact state between the brush and the metal rotating body. A rotating machine of the present invention includes a stator including a stator winding, a rotor including a rotor winding and rotatably disposed apart from the stator with a gap, a metal rotating body electrically coupled with the rotor winding, a brush in contact with the metal rotating body, and a pressing mechanism for increasing pressure to press the brush against the metal rotating body when contact failure occurs between the metal rotating body and the brush.Type: GrantFiled: October 22, 2015Date of Patent: February 5, 2019Assignee: Hitachi, Ltd.Inventors: Takeshi Iwata, Hiroaki Kojima, Motonobu Iizuka
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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: 10097059Abstract: A coil support structure including a coil spacer, a yoke spacer, and a support formed between the coil spacer and the yoke spacer. And the support has laterally protruding parts.Type: GrantFiled: February 14, 2017Date of Patent: October 9, 2018Assignee: Hitachi, Ltd.Inventors: Makoto Imura, Takayuki Koyama, Shigeki Nakae, Motonobu Iizuka, Masanori Matsumoto, Hideyuki Ootaka
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Patent number: 10075112Abstract: A field winding type synchronous machine connects to a DC line and includes a rotor; a stator; an exciter that passes a current through a field winding of the rotor; and a rectification circuit that rectifies an output from the exciter and provides the output to the DC line. The synchronous machine includes the field winding being connected in parallel to a first circuit in which a parallel circuit including a rectifier element and a first switchgear is connected in series to a discharge resistor, a second switchgear being connected in series to the DC line that connects the first circuit to the rectification circuit, and a capacitor being provided between the discharge resistor and the input side of an electric power source element for gating the first switchgear.Type: GrantFiled: February 14, 2017Date of Patent: September 11, 2018Assignee: Hitachi, Ltd.Inventors: Daisuke Kori, Motonobu Iizuka, Takayuki Koyama
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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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Publication number: 20170250636Abstract: A field winding type synchronous machine connects to a DC line and includes a rotor; a stator; an exciter that passes a current through a field winding of the rotor; and a rectification circuit that rectifies an output from the exciter and provides the output to the DC line. The synchronous machine includes the field winding being connected in parallel to a first circuit in which a parallel circuit including a rectifier element and a first switchgear is connected in series to a discharge resistor, a second switchgear being connected in series to the DC line that connects the first circuit to the rectification circuit, and a capacitor being provided between the discharge resistor and the input side of an electric power source element for gating the first switchgear.Type: ApplicationFiled: February 14, 2017Publication date: August 31, 2017Inventors: Daisuke KORI, Motonobu IIZUKA, Takayuki KOYAMA
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Publication number: 20170187264Abstract: The invention provides a rotating electrical machine system in which an air volume of a refrigerant is increased near the center of a rotating electrical machine in the axial direction is improved. The rotating electrical machine includes a rotor and a stator, in which the stator core, laminated electromagnetic steel sheets formed by laminating a plurality of electromagnetic steel sheets in the axial direction are divided into a plurality of sets of packet cores, and between one of the packet cores of the plurality of sets and another packet core adjacent to it, there is formed a duct providing a flow channel of the stator, and in a duct situated at the center side from both ends in the axial direction among the duct, there is a portion of two packet cores facing each other across the duct, a diameter direction length of the two packet cores becoming long.Type: ApplicationFiled: December 16, 2016Publication date: June 29, 2017Inventors: Daisuke KORI, Ryuichiro IWANO, Masanori SAWAHATA, Kazuo NISHIHAMA, Motonobu IIZUKA, Takayuki KOYAMA, Kenichi SUGIMOTO
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Publication number: 20170163116Abstract: A coil support structure including a coil spacer, a yoke spacer, and a support formed between the coil spacer and the yoke spacer. And the support has laterally protruding parts.Type: ApplicationFiled: February 14, 2017Publication date: June 8, 2017Inventors: Makoto IMURA, Takayuki KOYAMA, Shigeki NAKAE, Motonobu IIZUKA, Masanori MATSUMOTO, Hideyuki OOTAKA
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Publication number: 20170126098Abstract: The present invention provides a rotating electric machine comprising: a stator; a rotor disposed in such a manner that the outer peripheral surface of the rotor faces the inner peripheral surface of the stator; and a plurality of coil supports that support between poles of a coil forming the rotor, wherein the coil supports are detachably configured with respect to the rotor, at least one of the coil supports is provided with a fin formed of a member different from that of the coil support, and the fin is provided in such a manner that a windway through which a swirl flow occurring with the rotation of the rotor passes is formed between the coil and the fin.Type: ApplicationFiled: October 28, 2016Publication date: May 4, 2017Inventors: Youko FURUKAWA, Ryuuichirou IWANO, Daisuke KORI, Motonobu IIZUKA, Takayuki KOYAMA, Kazuhiro OGAWA, Shigeki NAKAE
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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: 20160118867Abstract: The present invention provides a rotating machine which can maintain good contact state between the brush and the metal rotating body. A rotating machine of the present invention includes a stator including a stator winding, a rotor including a rotor winding and rotatably disposed apart from the stator with a gap, a metal rotating body electrically coupled with the rotor winding, a brush in contact with the metal rotating body, and a pressing mechanism for increasing pressure to press the brush against the metal rotating body when contact failure occurs between the metal rotating body and the brush.Type: ApplicationFiled: October 22, 2015Publication date: April 28, 2016Inventors: Takeshi IWATA, Hiroaki KOJIMA, Motonobu IIZUKA
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Patent number: 9276506Abstract: A field winding type synchronous motor comprises a stator, a rotor with field windings, a brushless exciter, and a rectification circuit rectifying an output of the brushless exciter. A first circuit in parallel with the field windings includes a discharge resistor and a first switching device with a backward diode. The discharge resistor and the first switching device are connected in series. A second switching device is provided in one of the DC lines connecting the first circuit and the rectification circuit. The first switching device is controlled by a potential obtained by resistor dividing of an induced voltage in the field windings and a connection from the potential via a diode to anode adjacent to the rectification circuit on the one of the DC lines with the second switching device thereon. The second switching device is closed in a synchronous speed.Type: GrantFiled: July 30, 2014Date of Patent: March 1, 2016Assignee: Hitachi, Ltd.Inventors: Daisuke Kori, Motonobu Iizuka, Takayuki Koyama
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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