Patents by Inventor Takashi Yasuhara

Takashi Yasuhara 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: 20210070679
    Abstract: A process for producing one or both of tetrafluoroethylene and hexafluoropropylene, which includes pyrolyzing a low molecular weight fluorine compound by continuous reaction in a microreactor.
    Type: Application
    Filed: November 16, 2020
    Publication date: March 11, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Toshihiko OHTA, Hideki Nakaya, Mai Hirai, Takashi Yasuhara, Atsushi Noguchi
  • Patent number: 8388769
    Abstract: To mold a high-resistance magnet at low temperature, including room temperature, the magnet includes magnetic powders, metallic powders having a lower hardness than the magnetic powders and a high-resistance layer, wherein the magnetic powders occupy a larger volume than the metallic powders. In particular, the high-resistance layer contains a fluorine compound and is placed between the magnetic powder and the metallic powders.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: March 5, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Matahiro Komuro, Yuichi Satsu, Takashi Yasuhara
  • Publication number: 20120038236
    Abstract: A permanent magnet rotating electric machine comprises a stator having stator windings wound round a stator iron core and a permanent magnet rotor having a plurality of inserted permanent magnets in which the polarity is alternately arranged in the peripheral direction in the rotor iron core. The rotor iron core of the permanent magnets is composed of magnetic pole pieces, auxiliary magnetic poles, and a stator yoke, and furthermore has concavities formed on the air gap face of the magnetic pole pieces of the rotor iron core of the permanent magnets, gently tilting from the central part of the magnetic poles to the end thereof. In a permanent magnet rotating electric machine, effects of iron loss are reduced, and an electric car using highly efficient permanent magnet rotating electric machine are realized.
    Type: Application
    Filed: October 24, 2011
    Publication date: February 16, 2012
    Applicant: Hitachi, Ltd.
    Inventors: Fumio Tajima, Yutaka Matsunobu, Masashi Kitamura, Noriaki Hino, Takashi Kobayashi, Shigeru Kakugawa, Takashi Yasuhara
  • Patent number: 8067871
    Abstract: A permanent magnet rotating electric machine comprises a stator having stator windings wound round a stator iron core and a permanent magnet rotor having a plurality of inserted permanent magnets in which the polarity is alternately arranged in the peripheral direction in the rotor iron core. The rotor iron core of the permanent magnets is composed of magnetic pole pieces, auxiliary magnetic poles, and a stator yoke, and furthermore has concavities formed on the air gap face of the magnetic pole pieces of the rotor iron core of the permanent magnets, gently tilting from the central part of the magnetic poles to the end thereof. In a permanent magnet rotating electric machine, effects of iron loss are reduced, and an electric car using highly efficient permanent magnet rotating electric machine are realized.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: November 29, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Fumio Tajima, Yutaka Matsunobu, Masashi Kitamura, Noriaki Hino, Takashi Kobayashi, Shigeru Kakugawa, Takashi Yasuhara
  • Patent number: 7914695
    Abstract: The object of the present invention is to both reduce costs and improve magnetic characteristics of rare-earth bond magnets in which magnetic material is bound with a binding agent. In order to achieve this object, magnetic characteristics of a magnet are improved by performing cold forming on rare-earth magnetic powder by itself with no resin added. Then, in order to provide strength for the magnet, a low-viscosity SiO2 precursor is infiltrated and thermoset in the magnet shaped body. As a result, it is possible to obtain a rare-earth bond magnet in which magnetic characteristics are improved and costs are reduced.
    Type: Grant
    Filed: March 12, 2007
    Date of Patent: March 29, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Yuichi Satsu, Matahiro Komuro, Takao Imagawa, Takashi Yasuhara, Yutaka Matsunobu
  • Patent number: 7880357
    Abstract: A sintered magnet and a rotating machine equipped therewith are disclosed, which include: crystal grains of a ferromagnetic material consisting mainly of iron, and a fluoride compound or an oxyfluoride compound, containing at least one element selected from the group consisting of an alkali metal element, an alkaline earth metal element, and a rare earth element, the fluoride compound or the oxyfluoride compound being formed inside some of the crystal grains or in a part of a grain boundary part. The oxyfluoride compound or the fluoride compound contains carbon, and a grain boundary width of the ferromagnetic material is smaller than a grain boundary width of the ferromagnetic material in which the fluoride compound or the oxyfluoride compound is formed.
    Type: Grant
    Filed: August 18, 2009
    Date of Patent: February 1, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Hiroyuki Suzuki, Takao Imagawa, Yuichi Satsu, Matahiro Komuro, Takashi Yasuhara, Yutaka Matsunobu
  • Patent number: 7800271
    Abstract: The sintered magnet and the rotating machine equipped with the same are disclosed. The sintered magnet includes crystal grains of a ferromagnetic material consisting mainly of iron, and a fluoride compound or oxyfluoride compound layer containing at least one element selected from an alkali metal element, an alkali earth metal element, and a rare earth element. The layer is formed inside some of the crystal grains or in a part of a grain boundary part. An oxyfluoride compound or fluoride compound layer containing carbon in a stratified form is formed on an outermost surface of the crystal grains. The fluoride compound or oxyfluoride compound layer has a concentration gradient of carbon, contains at least one light rare earth element and at least one heavy rare earth element. The heavy rare earth element has a concentration lower than that of the light rare earth element.
    Type: Grant
    Filed: January 28, 2009
    Date of Patent: September 21, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Matahiro Komuro, Yuichi Satsu, Yutaka Matsunobu, Takashi Yasuhara
  • Patent number: 7764042
    Abstract: An inverter-driven rotating machine system is provided in which three-phase AC electric power of the inverter is supplied to a rear motor generator by using a cable. One end of an additional cable is connected to rotating machine terminals, namely motor input terminals of a motor case. The other end is connected to fixed voltage terminals, namely inverter additional terminals on an outer case of the inverter via resistors.
    Type: Grant
    Filed: June 25, 2007
    Date of Patent: July 27, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Koji Obata, Yutaka Matsunobu, Takashi Yasuhara, Takayuki Koizumi
  • Publication number: 20100163388
    Abstract: Regarding a key sheet having a plurality of key tops provided at a key base made of a transparent or translucent resin, and a key unit using the key sheet, in order to make the key sheet thinner and thereby make a device using the key sheet, e.g., a cellular phone, thinner, the key sheet comprises a key base made of a transparent or translucent resin; a plurality of key tops provided on said key base; and pressing elements or a pressing element sheet having pressing elements provided at a bottom surface thereof, provided at a bottom surface of said key base, wherein said key base is molded, into a sheet form, of a thermoplastic resin which is solid at a room temperature and obtains adhesive force only in a physical change of hot melting and cooling solidification.
    Type: Application
    Filed: May 8, 2008
    Publication date: July 1, 2010
    Applicant: SUNARROW LIMITED
    Inventor: Takashi YASUHARA
  • Publication number: 20100079025
    Abstract: A sintered magnet and a rotating machine equipped therewith are disclosed, which include: crystal grains of a ferromagnetic material consisting mainly of iron, and a fluoride compound or an oxyfluoride compound, containing at least one element selected from the group consisting of an alkali metal element, an alkaline earth metal element, and a rare earth element, the fluoride compound or the oxyfluoride compound being formed inside some of the crystal grains or in a part of a grain boundary part. The oxyfluoride compound or the fluoride compound contains carbon, and a grain boundary width of the ferromagnetic material is smaller than a grain boundary width of the ferromagnetic material in which the fluoride compound or the oxyfluoride compound is formed.
    Type: Application
    Filed: August 18, 2009
    Publication date: April 1, 2010
    Applicant: Hitachi, Ltd
    Inventors: Hiroyuki Suzuki, Takao Imagawa, Yuichi Satsu, Matahiro Komuro, Takashi Yasuhara, Yutaka Matsunobu
  • Patent number: 7659651
    Abstract: A rotating electric machine includes a stator core of a cylindrical shape, a rotor core coaxially rotating inside the stator core, and a plurality of coils each formed by winding magnet wires using a slot formed axially in either the stator core or the rotor core, or both: it is preferable that each of the coils be split into a plurality of coil groups, that starting sections of winding of the magnet wires in one of the coil groups be wound adjacently to ending sections of winding of the magnet wires in another of the coil groups, and that the starting sections and ending sections of winding of the magnet wires in the two coil groups be connected at respective outgoing wire ends to one another, outside the slots.
    Type: Grant
    Filed: August 10, 2007
    Date of Patent: February 9, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Koji Obata, Masaharu Senoo, Takeshi Obata, Akihiro Sekine, Mituru Itou, Takashi Yasuhara, Takayuki Koizumi
  • Publication number: 20100007232
    Abstract: Disclosed herein is a sintered magnet motor having a sintered magnet rotor, the rotor comprising: a ferromagnetic material comprising iron as a main ingredient to be sintered; a fluorine compound or an oxyfluoride compound formed in the inside of a crystal grain or to a portion of a grain boundary of the ferromagnetic material; and at least one of alkalis, alkaline earth elements, and rare earth elements contained in the fluorine compound or the oxyfluoride compound; a portion of the fluorine compound or the oxyfluoride compound being distributed with a concentration gradient established from the surface to the inside of the ferromagnetic material, and a rare earth element being distributed with a concentration gradient established between the grain boundary surface and the parent phase of the ferromagnetic material, wherein the concentration distribution of the fluorine compound is asymmetrical when viewed from the pole center of the sintered magnet rotor.
    Type: Application
    Filed: May 26, 2009
    Publication date: January 14, 2010
    Applicant: Hitachi Ltd.
    Inventors: Matahiro Komuro, Yuichi Satsu, Yutaka Matsunobu, Takashi Yasuhara
  • Publication number: 20100001609
    Abstract: An object of the present invention is to provide a compact, high-power rotating electric machine by downsizing coil ends on a distributed-wound stator using rectangular wires in comparison with the conventional one or by enhancing coil heat radiation from the coil ends or slot insertion portions. A stator (110) comprises a stator core (112), and stator coils (114) inserted into stator slots (112S) formed between a plurality of stator teeth (112T) formed on the stator core, and wound around the stator teeth in the form of distributed winding. Each stator coil (114) includes a plurality of rectangular wires having insulating coating, and the plurality of rectangular wires are inserted into the one stator slot. The direction of arrangement of the plurality of rectangular wires in the stator slot is different from that of the plurality of rectangular wires at both coil ends outside the stator slot.
    Type: Application
    Filed: August 15, 2006
    Publication date: January 7, 2010
    Applicant: HITACHI, LTD.
    Inventors: Takashi Ishigami, Satoshi Kikuchi, Takashi Naganawa, Takashi Yasuhara, Yutaka Matsunobu
  • Publication number: 20090224615
    Abstract: The sintered magnet and the rotating machine equipped with the same are disclosed. The sintered magnet includes crystal grains of a ferromagnetic material consisting mainly of iron, and a fluoride compound or oxyfluoride compound layer containing at least one element selected from an alkali metal element, an alkali earth metal element, and a rare earth element. The layer is formed inside some of the crystal grains or in a part of a grain boundary part. An oxyfluoride compound or fluoride compound layer containing carbon in a stratified form is formed on an outermost surface of the crystal grains. The fluoride compound or oxyfluoride compound layer has a concentration gradient of carbon, contains at least one light rare earth element and at least one heavy rare earth element. The heavy rare earth element has a concentration lower than that of the light rare earth element.
    Type: Application
    Filed: January 28, 2009
    Publication date: September 10, 2009
    Applicant: Hitachi, Ltd.
    Inventors: Matahiro KOMURO, Yuichi SATSU, Yutaka MATSUNOBU, Takashi YASUHARA
  • Patent number: 7569966
    Abstract: A stator coil, being a rectangular coil, is wound on a salient pole, striding across a plurality of slots, while being inserted sequentially through the inlet of a predetermined slot of the stator core. The stator coil comprises two slot inserts and to be inserted into the slot; two coil ends and located outside the end of the slot; and four twist sections arranged between the slot inserts and coil ends, processed by twisting. In the twist sections, twisting is applied to ensure that the surface of the rectangular coil in the second coil end will be opposite to the surface of the rectangular coil in the first coil end. The start of winding of the rectangular coil and the end of winding of the same coil are located on the same surface. Thereby, a rotating electrical machine with the large internal dimensions without increasing the external dimensions is achieved.
    Type: Grant
    Filed: August 10, 2005
    Date of Patent: August 4, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Yasuyuki Saito, Takashi Yasuhara, Hidemitsu Kobayashi
  • Publication number: 20090179518
    Abstract: A permanent magnet rotating electric machine comprises a stator having stator windings wound round a stator iron core and a permanent magnet rotor having a plurality of inserted permanent magnets in which the polarity is alternately arranged in the peripheral direction in the rotor iron core. The rotor iron core of the permanent magnets is composed of magnetic pole pieces, auxiliary magnetic poles, and a stator yoke, and furthermore has concavities formed on the air gap face of the magnetic pole pieces of the rotor iron core of the permanent magnets, gently tilting from the central part of the magnetic poles to the end thereof. In a permanent magnet rotating electric machine, effects of iron loss are reduced, and an electric car using highly efficient permanent magnet rotating electric machine are realized.
    Type: Application
    Filed: March 18, 2009
    Publication date: July 16, 2009
    Applicant: Hitachi, Ltd.
    Inventors: Fumio TAJIMA, Yutaka MATSUNOBU, Masashi KITAMURA, Noriaki HINO, Takashi KOBAYASHI, Shigeru KAKUGAWA, Takashi YASUHARA
  • Publication number: 20090174111
    Abstract: A method of manufacturing key tops for push button switches is provided, which method includes the step of embossing three dimensional shapes formed in a first mold and/or a second mold into a resin member heated to a predetermined temperature by using the first mold and the second mold to integrally form the resin member into a sheet-like resin member including three dimensionally shaped key tops, with a predetermined gap provided between a first face and a second face of the three dimensionally shaped key top, which respectively face the first mold and the second mold.
    Type: Application
    Filed: April 25, 2007
    Publication date: July 9, 2009
    Applicant: SUNARROW LIMITED
    Inventor: Takashi Yasuhara
  • Patent number: 7557483
    Abstract: A stator coil is configured of a first group of six turns of conductive wire, and a second group also of six turns, with the first group of six turns being wound on a spool, leaving a gap the same as the diameter of the conductive wire between winds. Upon completion of winding the first group, the winding is turned back, and the second group of six turns is wound in the gap, so as to be adjacent to the turns of the first group. The article is then inserted into a slot in a stator core of a stator, thereby configuring a stator coil. This provides for a rotating electrical machine and manufacturing method thereof with improved insulation resistivity regarding inverter surge voltage, and moreover high output can be obtained with a machine of comparable external dimensions with conventional machines.
    Type: Grant
    Filed: December 12, 2005
    Date of Patent: July 7, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Yasuhara, Takayuki Koizumi, Ryozo Takeuchi, Koji Obata, Hidemitsu Kobayashi
  • Patent number: 7521832
    Abstract: A permanent magnet rotating electric machine comprises a stator having stator windings wound round a stator iron core and a permanent magnet rotor having a plurality of inserted permanent magnets in which the polarity is alternately arranged in the peripheral direction in the rotor iron core. The rotor iron core of the permanent magnets is composed of magnetic pole pieces, auxiliary magnetic poles, and a stator yoke, and furthermore has concavities formed on the air gap face of the magnetic pole pieces of the rotor iron core of the permanent magnets, gently tilting from the central part of the magnetic poles to the end thereof. In a permanent magnet rotating electric machine, effects of iron loss are reduced, and an electric car using highly efficient permanent magnet rotating electric machine are realized.
    Type: Grant
    Filed: December 15, 2006
    Date of Patent: April 21, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Fumio Tajima, Yutaka Matsunobu, Masashi Kitamura, Noriaki Hino, Takashi Kobayashi, Shigeru Kakugawa, Takashi Yasuhara
  • Patent number: RE44037
    Abstract: A permanent magnet rotating electric machine comprises a stator having stator windings wound round a stator iron core and a permanent magnet rotor having a plurality of inserted permanent magnets in which the polarity is alternately arranged in the peripheral direction in the rotor iron core. The rotor iron core of the permanent magnets is composed of magnetic pole pieces, auxiliary magnetic poles, and a stator yoke, and furthermore has concavities formed on the air gap face of the magnetic pole pieces of the rotor iron core of the permanent magnets, gently tilting from the central part of the magnetic poles to the end thereof. In a permanent magnet rotating electric machine, effects of iron loss are reduced, and an electric car using highly efficient permanent magnet rotating electric machine are realized.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: March 5, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Fumio Tajima, Yutaka Matsunobu, Masashi Kitamura, Noriaki Hino, Takashi Kobayashi, Shigeru Kakugawa, Takashi Yasuhara