Patents by Inventor Takaaki Matsuo

Takaaki Matsuo 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).

  • Publication number: 20240039427
    Abstract: A power converting apparatus includes a converter, a smoothing unit, inverters, and a control unit. The inverters are connected to the converter, the inverters being in parallel connection with each other. The inverter converts power output from the smoothing unit into a first alternating-current power, and outputs the first alternating-current power to a device in which a motor is installed. The inverter converts power outputted from the smoothing unit into a second alternating-current power, and outputs the second alternating-current power to a device in which a motor is installed. The control unit controls an operation of the converter and the inverters to reduce a current flowing in the smoothing unit and concurrently controls an operation of the inverter in accordance with an operation state of the inverter and a load unit including the device.
    Type: Application
    Filed: February 12, 2021
    Publication date: February 1, 2024
    Inventors: Koichi ARISAWA, Takaaki TAKAHARA, Haruka MATSUO, Keisuke UEMURA
  • Publication number: 20240014759
    Abstract: A control device controls operation of a power conversion apparatus including a converter, a smoothing capacitor, and an inverter. The control device includes a voltage command calculation unit, a torque ripple compensation command calculation unit, and a beat component compensation command calculation unit. The voltage command calculation unit calculates a voltage command including a first compensation command to reduce a first torque ripple pulsating at twice a frequency of a power-supply voltage. The torque ripple compensation command calculation unit calculates a second compensation command to reduce a second torque ripple pulsating at a rotational frequency of a motor. The beat component compensation command calculation unit calculates a third compensation command to reduce a third torque ripple caused by the first torque ripple and by the second torque ripple.
    Type: Application
    Filed: January 26, 2021
    Publication date: January 11, 2024
    Inventors: Haruka MATSUO, Takaaki TAKAHARA, Koichi ARISAWA, Keisuke UEMURA, Yosuke HACHIYA
  • Publication number: 20240006984
    Abstract: A power converter includes a converter, a smoothing capacitor, an inverter, and a controller. The converter rectifies a power supply voltage applied from an alternating-current power supply. The smoothing capacitor smooths a rectified voltage output from the converter into a direct-current voltage including a ripple. The inverter converts the direct-current voltage smoothed by the smoothing capacitor into an alternating-current voltage to be applied to a motor. The controller performs control such that a first physical quantity representing an operation state of the converter is equal to a second physical quantity representing an operation state of the inverter.
    Type: Application
    Filed: January 6, 2021
    Publication date: January 4, 2024
    Inventors: Haruka MATSUO, Takaaki TAKAHARA, Koichi ARISAWA, Keisuke UEMURA, Kenji TAKAHASHI
  • Publication number: 20240007019
    Abstract: A power converter includes a converter that rectifies an alternating-current voltage applied from an alternating-current power supply, a capacitor connected to output ends of the converter, an inverter connected both ends of the capacitor, and a controller that controls an operation of the inverter. A voltage output from the converter includes a ripple component due to a voltage fluctuation of the alternating-current voltage. When the controller performs acceleration and deceleration control on the motor, the controller changes a rotational speed command from a command value during the normal control, in a first period in which a rotational speed of the motor is in a first speed range.
    Type: Application
    Filed: January 6, 2021
    Publication date: January 4, 2024
    Inventors: Haruka MATSUO, Takaaki TAKAHARA, Koichi ARISAWA, Keisuke UEMURA, Yosuke HACHIYA
  • Patent number: 11855410
    Abstract: A semiconductor optical module includes a semiconductor laser element region having an active layer, a first cladding layer which is formed such that the active layer is embedded therein, a second cladding layer which is formed underneath the active layer and the first cladding layer, and a heater unit which produces a temperature change in a waveguide; an optical waveguide element region including a spot-size converter which converts a spot size of incident laser light, and an optical waveguide core layer which is formed such that the spot-size converter is embedded therein, the first cladding layer contains InP, the second cladding layer is made of a material lower in refractive index and higher in thermal conductivity than the first cladding layer, and a third cladding layer which is made of a material lower in refractive index and lower in thermal conductivity than the second cladding layer is formed underneath the spot-size converter and the heater unit.
    Type: Grant
    Filed: May 15, 2019
    Date of Patent: December 26, 2023
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Suguru Yamaoka, Ryo Nakao, Takaaki Kakitsuka, Shinji Matsuo
  • Publication number: 20230412093
    Abstract: A power converter includes a converter, a smoothing capacitor, an inverter, and a single calculator. The converter includes a switching element and rectifies a power supply voltage applied from an alternating-current power supply. The smoothing capacitor smooths a rectified voltage output from the converter into a direct-current voltage including a ripple. The inverter converts the direct-current voltage smoothed by the smoothing capacitor into an alternating-current voltage for a motor. The calculator performs control such that a first physical quantity representing an operation state of the converter is equal to a second physical quantity representing an operation state of the inverter.
    Type: Application
    Filed: January 6, 2021
    Publication date: December 21, 2023
    Inventors: Keisuke UEMURA, Tomohiro KUTSUKI, Haruka MATSUO, Koichi ARISAWA, Takaaki TAKAHARA, Kenji TAKAHASHI, Koyo MATSUZAKI
  • Publication number: 20230378867
    Abstract: A power conversion apparatus includes a rectification and boost unit that rectifies a first alternating-current power supplied from a commercial power supply and boosts voltage of the first alternating-current power; a capacitor connected to output terminals of the rectification and boost unit; an inverter that is connected across the capacitor, converts power output from the rectification and boost unit and the capacitor into a second alternating-current power, and outputs the second alternating-current power to a load including a motor; and a control unit that performs operation control on the rectification and boost unit, and performs operation control on the inverter to cause the second alternating-current power that includes a pulsation based on a pulsation of power that flows into the capacitor from the rectification and boost unit to be output from the inverter to the load, to restrain a current that flows into the capacitor.
    Type: Application
    Filed: October 26, 2020
    Publication date: November 23, 2023
    Inventors: Takaaki TAKAHARA, Koichi ARISAWA, Keisuke UEMURA, Haruka MATSUO, Koyo MATSUZAKI
  • Publication number: 20230336090
    Abstract: A power conversion apparatus includes a rectification unit that rectifies a first alternating-current power supplied from a commercial power supply; a capacitor connected to output terminals of the rectification unit; an inverter that is connected across the capacitor, converts power output from the rectification unit and the capacitor into a second alternating-current power and, outputs the second alternating-current power to a load including a motor; and a control unit that performs operation control on the inverter to cause the second alternating-current power that includes a pulsation based on a pulsation of power that flows into the capacitor from the rectification unit to be output from the inverter to the load, to restrain a current that flows into the capacitor.
    Type: Application
    Filed: October 26, 2020
    Publication date: October 19, 2023
    Inventors: Takaaki TAKAHARA, Koichi ARISAWA, Keisuke UEMURA, Haruka MATSUO, Koyo MATSUZAKI, Kenji TAKAHASHI, Akira SATAKE, Hajime TOYODA
  • Publication number: 20230318489
    Abstract: A power converter includes a converter circuit, a capacitor, and an inverter circuit. The converter circuit includes diodes that are connected in a half-bridge configuration. An alternating-current input end of the converter circuit is connected to one side of an alternating-current power supply. The inverter circuit includes semiconductor switching elements that are connected in a three-phase bridge configuration. An alternating-current output end of the inverter circuit is connected to a motor as a load, and an alternating-current output end is further connected to another side of the alternating-current power supply.
    Type: Application
    Filed: January 6, 2021
    Publication date: October 5, 2023
    Inventors: Keisuke UEMURA, Tomohiro KUTSUKI, Haruka MATSUO, Koichi ARISAWA, Takaaki TAKAHARA, Kazunori HATAKEYAMA
  • Publication number: 20230308025
    Abstract: A power conversion device includes a rectification unit that rectifies first alternating current (AC) power supplied from a commercial power supply, a capacitor connected to an output end of the rectification unit, an inverter that converts power output from the rectification unit and from the capacitor into second AC power, and outputs the second AC power to a load including a motor, which inverter is connected to both ends of the capacitor, and a control unit that controls operation of the inverter to output the second AC power from the inverter to the load to reduce current flowing to the capacitor, which second AC power includes a pulsation that depends on a pulsation of power flowing from the rectification unit to the capacitor. No discharge circuit and no overvoltage protection circuit are provided for the capacitor.
    Type: Application
    Filed: October 26, 2020
    Publication date: September 28, 2023
    Inventors: Takaaki TAKAHARA, Koichi ARISAWA, Keisuke UEMURA, Haruka MATSUO, Koyo MATSUZAKI
  • Patent number: 11747659
    Abstract: The optical modulator includes a lower cladding layer formed on a substrate, a core formed on the lower cladding layer, and an upper cladding layer formed on the core. The core is made of an InP-based semiconductor having a bandgap corresponding to a desired wavelength. Refractive indexes of the lower cladding layer and upper cladding layer are equal to or less than a refractive index of InP.
    Type: Grant
    Filed: February 8, 2019
    Date of Patent: September 5, 2023
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Tatsurou Hiraki, Takaaki Kakitsuka, Shinji Matsuo
  • Patent number: 11705693
    Abstract: An embodiment semiconductor optical device includes an optical waveguide including a core, and an active layer extending in the waveguide direction of the optical waveguide for a predetermined distance and arranged in a state in which the active layer can be optically coupled to the core. The core and the active layer are arranged in contact with each other. The core is formed of a material with a refractive index of about 1.5 to 2.2, such as SiN, for example. In addition, the core is formed to a thickness at which a higher-order mode appears. The higher-order mode is an E12 mode, for example.
    Type: Grant
    Filed: December 24, 2019
    Date of Patent: July 18, 2023
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Takuma Aihara, Shinji Matsuo, Takaaki Kakitsuka, Tai Tsuchizawa, Tatsuro Hiraki
  • Patent number: 11536162
    Abstract: An exhaust chamber of a steam turbine according to an embodiment includes an outer casing which includes an end wall part in an axial direction and an extension part extending upward in the axial direction from the end wall part, a first flow guide formed into an annular shape, the first flow guide forming an upstream region of a diffuser surface in a hub-side flow guide and being fixed to an upstream end portion of the extension part on a radially inner side of the diffuser surface, and a second flow guide formed into an annular shape, the second flow guide forming a downstream region of the diffuser surface at a position downstream of the first flow guide and on a radially outer side of the extension part, and being fixed to the extension part.
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: December 27, 2022
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Shoki Yamashita, Takaaki Matsuo, Soichiro Tabata
  • Publication number: 20210262365
    Abstract: An exhaust chamber of a steam turbine according to an embodiment includes an outer casing which includes an end wall part in an axial direction and an extension part extending upward in the axial direction from the end wall part, a first flow guide formed into an annular shape, the first flow guide forming an upstream region of a diffuser surface in a hub-side flow guide and being fixed to an upstream end portion of the extension part on a radially inner side of the diffuser surface, and a second flow guide formed into an annular shape, the second flow guide forming a downstream region of the diffuser surface at a position downstream of the first flow guide and on a radially outer side of the extension part, and being fixed to the extension part.
    Type: Application
    Filed: September 20, 2019
    Publication date: August 26, 2021
    Applicant: Mitsubishi Power, Ltd.
    Inventors: Shoki Yamashita, Takaaki Matsuo, Soichiro Tabata
  • Patent number: 10472723
    Abstract: Provided is a method of preventing reverse current flow through an ion exchange membrane electrolyzer, which method is capable of preventing a reverse current from being generated after stopping operation of the ion exchange membrane electrolyzer. A method of preventing reverse current flow through an ion exchange membrane electrolyzer 100, the ion exchange membrane electrolyzer 100 having an anode chamber 107 housing an anode, a cathode chamber 110 housing a cathode, an anode solution-supplying manifold 121 to feed anode solution to the anode chamber 107, and a cathode solution-supplying manifold 124 to feed cathode solution to the cathode chamber 110.
    Type: Grant
    Filed: January 6, 2015
    Date of Patent: November 12, 2019
    Assignee: THYSSENKRUPP UHDE CHLORINE ENGINEERS (JAPAN) LTD.
    Inventors: Kazuyuki Arai, Yoshinari Take, Terumi Hashimoto, Takaaki Matsuo, Toshikazu Hayashida
  • Patent number: 9551224
    Abstract: The turbine includes: a shaft body supported rotatably; a plurality of turbine blade members; a casing covering the shaft body and the turbine blade row; an outer ring member that is provided on an inner periphery of the casing and includes an inner peripheral portion in which a cross-section having a uneven shape is continuous in a circumferential direction; a plurality of turbine vane members that each has a shroud fitted into the inner peripheral portion of the outer ring member and a turbine vane main body extending from the shroud to a radially inward side; and a plate member that connects at least some of the plurality of turbine vane members and covers one side of the shrouds in the axial direction, thereby sealing a shroud gap formed between the shrouds adjacent to each other in the circumferential direction.
    Type: Grant
    Filed: October 28, 2011
    Date of Patent: January 24, 2017
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Tomoyuki Onishi, Yuichiro Waki, Shoki Yamashita, Takaaki Matsuo, Asaharu Matsuo
  • Publication number: 20160194769
    Abstract: Provided is a method of preventing reverse current flow through an ion exchange membrane electrolyzer, which method is capable of preventing a reverse current from being generated after stopping operation of the ion exchange membrane electrolyzer. A method of preventing reverse current flow through an ion exchange membrane electrolyzer 100, the ion exchange membrane electrolyzer 100 having an anode chamber 107 housing an anode, a cathode chamber 110 housing a cathode, an anode solution-supplying manifold 121 to feed anode solution to the anode chamber 107, and a cathode solution-supplying manifold 124 to feed cathode solution to the cathode chamber 110.
    Type: Application
    Filed: January 6, 2015
    Publication date: July 7, 2016
    Applicant: CHLORINE ENGINEERS CORP., LTD.
    Inventors: Kazuyuki ARAI, Yoshinari TAKE, Terumi HASHIMOTO, Takaaki MATSUO, Toshikazu HAYASHIDA
  • Patent number: 8702311
    Abstract: The present invention aims at providing a technique for providing a stepped structure separately to a rotating shaft in a later step of assembly for preventing oil leakage from a bearing box. To this end, the rotating machine of the present invention includes a rotating shaft having a rotating member, a bearing device including a rotating shaft insertion hole larger in diameter than the rotating shaft, an oil thrower provided between an outer circumferential portion of the rotating shaft insertion hole and the rotating shaft, and an additional ring attached to the rotating shaft between the oil thrower and the rotating shaft such as to protrude in a radial direction of the rotating shaft.
    Type: Grant
    Filed: March 5, 2009
    Date of Patent: April 22, 2014
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Takaaki Matsuo, Hideyuki Toda, Taku Ichiryu
  • Publication number: 20130149125
    Abstract: The turbine includes: a shaft body supported rotatably; a plurality of turbine blade members; a casing covering the shaft body and the turbine blade row; an outer ring member that is provided on an inner periphery of the casing and includes an inner peripheral portion in which a cross-section having a uneven shape is continuous in a circumferential direction; a plurality of turbine vane members that each has a shroud fitted into the inner peripheral portion of the outer ring member and a turbine vane main body extending from the shroud to a radially inward side; and a plate member that connects at least some of the plurality of turbine vane members and covers one side of the shrouds in the axial direction, thereby sealing a shroud gap formed between the shrouds adjacent to each other in the circumferential direction.
    Type: Application
    Filed: October 28, 2011
    Publication date: June 13, 2013
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Tomoyuki Onishi, Yuichiro Waki, Shoki Yamashita, Takaaki Matsuo, Asaharu Matsuo
  • Publication number: 20110014030
    Abstract: The present invention aims at providing a technique for providing a stepped structure separately to a rotating shaft in a later step of assembly for preventing oil leakage from a bearing box. To this end, the rotating machine of the present invention includes a rotating shaft having a rotating member, a bearing device including a rotating shaft insertion hole larger in diameter than the rotating shaft, an oil thrower provided between an outer circumferential portion of the rotating shaft insertion hole and the rotating shaft, and an additional ring attached to the rotating shaft between the oil thrower and the rotating shaft such as to protrude in a radial direction of the rotating shaft.
    Type: Application
    Filed: March 5, 2009
    Publication date: January 20, 2011
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Takaaki Matsuo, Hideyuki Toda, Taku Ichiryu