Patents by Inventor Ryouichi Takahata
Ryouichi Takahata 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: 10808968Abstract: A thermoacoustic cooling device includes a tube in which a working fluid is enclosed; a first stack that generates acoustic waves in the working fluid with use of a temperature gradient; a first high-temperature heat exchanger provided at a first side of the first stack to heat the first side of the first stack; a first low-temperature heat exchanger provided at a second side of the first stack; a second stack in which a temperature gradient is generated by the acoustic waves; a second high-temperature heat exchanger provided at a first side of the second stack, which has a high temperature; a second low-temperature heat exchanger provided at a second side of the second stack, which has a low temperature; and a heat transfer portion configured to connect the second low-temperature heat exchanger to the first low-temperature heat exchanger so as to transfer heat therebetween.Type: GrantFiled: August 8, 2017Date of Patent: October 20, 2020Assignees: JTEKT CORPORATION, PUBLIC UNIVERSITY CORPORATION OSAKA CITY UNIVERSITYInventors: Toshiyuki Saito, Ryouichi Takahata, Tomoyuki Takei, Osamu Ishikawa
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Patent number: 10739043Abstract: In a conveying device, a belt conveyer is equipped with a conveying portion that conveys an object from an upstream region to a downstream region. A heat source heats the conveyed object. A cooling portion is located downstream of a terminal end of the belt conveyor and cools the object. A first thermoacoustic cooling device cools the cooling portion. A first prime mover generates acoustic waves from heat transmitted from the first heat source. A first receiver generates, from the acoustic waves, cooling heat corresponding to a cooling temperature that is lower than a temperature of the heat source.Type: GrantFiled: September 15, 2017Date of Patent: August 11, 2020Assignee: JTEKT CORPORATIONInventors: Toshiyuki Saito, Ryouichi Takahata, Tomoyuki Takei, Masashi Hattori
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Patent number: 10712054Abstract: A thermoacoustic device includes a loop pipe, a first stack that is disposed in the loop pipe and that generates a sound wave in the loop pipe by way of a temperature gradient, a second stack that is disposed in the loop pipe and that generates a temperature gradient, a first high temperature side heat exchanger that is disposed at one end of the first stack and that makes the temperature of the one end of the first stack be higher than the other end, and a first low temperature side heat exchanger that is disposed at the other end of the first stack and that makes the temperature of the other end of the first stack be lower than the one end.Type: GrantFiled: October 18, 2017Date of Patent: July 14, 2020Assignees: JTEKT CORPORATION, UNIVERSITY PUBLIC CORPORATION OSAKAInventors: Toshiyuki Saito, Ryouichi Takahata, Tomoyuki Takei, Osamu Ishikawa
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Publication number: 20190242624Abstract: A thermoacoustic device includes a loop pipe, a first stack that is disposed in the loop pipe and that generates a sound wave in the loop pipe by way of a temperature gradient, a second stack that is disposed in the loop pipe and that generates a temperature gradient, a first high temperature side heat exchanger that is disposed at one end of the first stack and that makes the temperature of the one end of the first stack be higher than the other end, and a first low temperature side heat exchanger that is disposed at the other end of the first stack and that makes the temperature of the other end of the first stack be lower than the one end.Type: ApplicationFiled: October 18, 2017Publication date: August 8, 2019Applicants: JTEKT CORPORATION, UNIVERSITY PUBLIC CORPORATION OSAKAInventors: Toshiyuki SAITO, Ryouichi TAKAHATA, Tomoyuki TAKEI, Osamu ISHIKAWA
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Publication number: 20180073781Abstract: In a conveying device, a belt conveyer is equipped with a conveying portion that conveys an object from an upstream region to a downstream region. A heat source heats the conveyed object. A cooling portion is located downstream of a terminal end of the belt conveyor and cools the object. A first thermoacoustic cooling device cools the cooling portion. A first prime mover generates acoustic waves from heat transmitted from the first heat source. A first receiver generates, from the acoustic waves, cooling heat corresponding to a cooling temperature that is lower than a temperature of the heat source.Type: ApplicationFiled: September 15, 2017Publication date: March 15, 2018Applicants: JTEKT CORPORATION, Koyo Thermo Systems Co., Ltd.Inventors: Toshiyuki SAITO, Ryouichi TAKAHATA, Tomoyuki TAKEI, Masashi HATTORI
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Publication number: 20180045435Abstract: A thermoacoustic cooling device includes a tube in which a working fluid is enclosed; a first stack that generates acoustic waves in the working fluid with use of a temperature gradient; a first high-temperature heat exchanger provided at a first side of the first stack to heat the first side of the first stack; a first low-temperature heat exchanger provided at a second side of the first stack; a second stack in which a temperature gradient is generated by the acoustic waves; a second high-temperature heat exchanger provided at a first side of the second stack, which has a high temperature; a second low-temperature heat exchanger provided at a second side of the second stack, which has a low temperature; and a heat transfer portion configured to connect the second low-temperature heat exchanger to the first low-temperature heat exchanger so as to transfer heat therebetween.Type: ApplicationFiled: August 8, 2017Publication date: February 15, 2018Applicants: JTEKT CORPORATION, PUBLIC UNIVERSITY CORPORATION OSAKA CITY UNIVERSITYInventors: Toshiyuki SAITO, Ryouichi TAKAHATA, Tomoyuki TAKEI, Osamu ISHIKAWA
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Patent number: 9748887Abstract: A permanent magnet synchronous motor includes at least two series-connected windings for each phase, and is configured to be driven by selecting the windings using a multi-inverter driving device configured to switch between an inverter for low-speed drive and an inverter for high-speed drive. A ratio of an induced voltage constant of at least one group of windings constituting the windings for the high-speed drive and a d-axis inductance is larger than a ratio of an induced voltage constant of all the series-connected windings to the d-axis inductance.Type: GrantFiled: December 15, 2015Date of Patent: August 29, 2017Assignee: Hitachi, Ltd.Inventors: Yasuo Notohara, Eri Maruyama, Wataru Hatsuse, Ryouichi Takahata
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Publication number: 20170117762Abstract: A rotor is formed such that a concave section is formed on the q axis and a gap between the concave section and a tooth of a stator is larger than a gap between an outer circumferential section and the tooth on the d axis. The concave section is formed in a substantially trapezoidal shape and formed such that an opening degree ?p2 on an outer circumference side is large with respect to an opening degree ?p1 on an inner circumference side. The opening degree ?p2 is set within a range of approximately 60 degrees in the electrical angle. A slit is not formed near the d axis on the outer circumference side of the permanent magnet insertion hole and a plurality of slits are formed on left and right both sides a predetermined distance or more apart from the d axis.Type: ApplicationFiled: March 24, 2015Publication date: April 27, 2017Applicant: Hitachi Appliances, Inc.Inventors: Ryouichi TAKAHATA, Tsenghong LIN, Syuuji HASEGAWA, Satoshi NAKAMURA
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Publication number: 20160204728Abstract: A permanent magnet synchronous motor includes at least two series-connected windings for each phase, and is configured to be driven by selecting the windings using a multi-inverter driving device configured to switch between an inverter for low-speed drive and an inverter for high-speed drive. A ratio of an induced voltage constant of at least one group of windings constituting the windings for the high-speed drive and a d-axis inductance is larger than a ratio of an induced voltage constant of all the series-connected windings to the d-axis inductance.Type: ApplicationFiled: December 15, 2015Publication date: July 14, 2016Inventors: Yasuo NOTOHARA, Eri MARUYAMA, Wataru HATSUSE, Ryouichi TAKAHATA
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Publication number: 20160061288Abstract: A flywheel includes a wheel ring and a hub ring fitted into the wheel ring. A hub ring main body of the hub ring pressure-contacts an inner periphery of the wheel ring while the flywheel is rotating. The pressure contact of the hub ring with the inner periphery of the wheel ring allows compressive stress applied to the wheel ring in a radial direction to cancel a portion of tensile stress acting in the wheel ring in the radial direction. As a result, the stress in the wheel ring in the radial direction decreases.Type: ApplicationFiled: August 6, 2015Publication date: March 3, 2016Inventors: Daisuke OZAKI, Ryouichi TAKAHATA, Katsutoshi NISHIZAKI
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Patent number: 8833334Abstract: An oil pump apparatus in which an electrical pump can be easily disposed is provided. A mechanical pump including: an inner gear which is configured to be driven by an engine; and an outer gear which is configured to mesh with the inner gear, and an electrical pump including: an outer gear which is configured to be driven by a motor section; and an inner gear which is configured to mesh with the outer gear are installed adjacent to each other in the axial direction in a pump installation space of a pump housing having suction ports and ejection ports. A blocking plate which is configured to block communications between the suction ports and the ejection ports is disposed between the mechanical pump and the electrical pump.Type: GrantFiled: November 17, 2011Date of Patent: September 16, 2014Assignee: JTEKT CorporationInventors: Kentaro Watanabe, Motoyasu Yamamori, Ryouichi Takahata, Kazuya Ando, Naomasa Mukaide
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Publication number: 20130228148Abstract: An oil pump apparatus in which an electrical pump can be easily disposed is provided. A mechanical pump including: an inner gear which is configured to be driven by an engine; and an outer gear which is configured to mesh with the inner gear, and an electrical pump including: an outer gear which is configured to be driven by a motor section; and an inner gear which is configured to mesh with the outer gear are installed adjacent to each other in the axial direction in a pump installation space of a pump housing having suction ports and ejection ports. A blocking plate which is configured to block communications between the suction ports and the ejection ports is disposed between the mechanical pump and the electrical pump.Type: ApplicationFiled: November 17, 2011Publication date: September 5, 2013Applicant: JTEKT CORPORATIONInventors: Kentaro Watanabe, Motoyasu Yamamori, Ryouichi Takahata, Kazuya Ando, Naomasa Mukaide
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Publication number: 20060103249Abstract: A superconductive magnetic bearing 22 comprises a stationary bearing portion 23 having an annular superconductor unit 26 provided on a fixed portion 20, and a rotatable bearing portion 24 having annular permanent magnet units 28, 29 provided on a rotary portion 21 so as to be opposed to the superconductor unit 26. The rotary portion 21 is contactlessly supported relative to the fixed portion 20 by the pinning effect of a superconductor constituting the superconductor unit 26. The permanent magnet units 28, 29 each comprise a plurality of permanent magnet members arranged in superposed layers with an insulating layer provided between each adjacent pair of magnet members.Type: ApplicationFiled: August 2, 2002Publication date: May 18, 2006Applicants: KOYO SEIKO CO., LTD, KAZUYKI DEMACHIInventors: Kenzo Miya, Kazuyuki Demachi, Hironori Kameno, Ryouichi Takahata