Patents by Inventor Shinsaku Hakuta
Shinsaku Hakuta 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: 6538351Abstract: A rotating machine having a stator core and coolers for cooling a cooling medium which is circulated inside the machine by the rotation of a fan installed near a rotating axis of the rotating machine. The coolers being installed in a ventilation passage for the cooling medium and including at least one cooler installed in one ventilation passage extending from an exhaust side of the fan to a suction side of the fan via the stator core, and at least another cooler installed in another ventilation passage extending from the exhaust side of the fan in the one ventilation passage to an inside of an inner surface of the stator core.Type: GrantFiled: March 18, 2002Date of Patent: March 25, 2003Assignee: Hitachi, Ltd.Inventors: Akitomi Semba, Tadashi Sonobe, Takashi Watanabe, Yasuomi Yagi, Junji Sato, Shinsaku Hakuta, Hideaki Mori, Eiji Tsuji, Kenichi Hattori, Atsushi Ishihara
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Publication number: 20020101121Abstract: A rotating machine having a stator core and coolers for cooling a cooling medium which is circulated inside the machine by the rotation of a fan installed near a rotating axis of the rotating machine. The coolers being installed in a ventilation passage for the cooling medium and including at least one cooler installed in one ventilation passage extending from an exhaust side of the fan to a suction side of the fan via the stator core, and at least another cooler installed in another ventilation passage extending from the exhaust side of the fan in the one ventilation passage to an inside of an inner surface of the stator core.Type: ApplicationFiled: March 18, 2002Publication date: August 1, 2002Inventors: Akitomi Semba, Tadashi Sonobe, Takashi Watanabe, Yasuomi Yagi, Junji Sato, Shinsaku Hakuta, Hideaki Mori, Eiji Tsuji, Kenichi Hattori, Atsushi Ishihara
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Patent number: 6359351Abstract: A rotating machine having a stator core and being equipped with coolers for cooling a cooling medium which is circulated inside the machine by the rotation of a fan installed near a rotating axis of the rotating machine. The coolers are installed in a ventilation passage for the cooling medium and include a primary cooler installed in a primary ventilation passage extending from an exhaust side of the fan to a suction side of the fan via the stator core, and a secondary cooler installed in a secondary ventilation passage extending from the exhaust side of the fan in the primary ventilation passage to an inside of an inner surface of the stator core via the stator core.Type: GrantFiled: June 4, 2001Date of Patent: March 19, 2002Assignee: Hitachi, Ltd.Inventors: Akitomi Semba, Tadashi Sonobe, Takashi Watanabe, Yasuomi Yagi, Junji Sato, Shinsaku Hakuta, Hideaki Mori, Eiji Tsuji, Kenichi Hattori, Atsushi Ishihara
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Patent number: 6265795Abstract: A rotating machine having a core and being equipped with coolers for cooling a cooling medium which is circulated inside the machine by the rotation of a fan installed near the rotating axis. The coolers are installed in a ventilation passage for the cooling medium and comprise a primary cooler installed in a primary ventilation passage extending from the exhaust side of a fan installed near the rotating axis to the suction side of said fan via the core, and a secondary cooler installed in a secondary passage that is branched from the primary ventilation passage.Type: GrantFiled: June 5, 2000Date of Patent: July 24, 2001Assignee: Hitachi, LTDInventors: Akitomi Semba, Tadashi Sonobe, Takashi Watanabe, Yasuomi Yagi, Junji Sato, Shinsaku Hakuta, Hideaki Mori, Eiji Tsuji, Kenichi Hattori, Atsushi Ishihara
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Patent number: 6262501Abstract: A rotating machine equipped with coolers for cooling a cooling medium which is circulated inside the machine by the rotation of a fan installed on the rotating axis. The coolers includes two or more coolers installed in a ventilation passage for the cooling medium. At least part of the cooling medium cooled by one cooler is further cooled by another cooler.Type: GrantFiled: June 5, 2000Date of Patent: July 17, 2001Assignee: Hitachi, LTDInventors: Akitomi Semba, Tadashi Sonobe, Takashi Watanabe, Yasuomi Yaji, Junji Sato, Shinsaku Hakuta, Hideaki Mori, Eiji Tsuji, Kenichi Hattori, Atsushi Ishihara
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Patent number: 6262502Abstract: A rotating machine having a stator core and being equipped with coolers for cooling a cooling medium which is circulated inside the machine by the rotation of a fan installed near the rotating axis. The coolers are installed in a ventilation passage for the cooling medium and comprise a primary cooler installed in a primary ventilation passage extending from the exhaust side of a fan installed near the rotating axis to the suction side of the fan via the stator core, and a secondary cooler installed in a secondary ventilation passage extending from the exhaust side of the fan in the primary ventilation passage to the inside of the inner surface of the stator core via the stator core.Type: GrantFiled: June 5, 2000Date of Patent: July 17, 2001Assignee: Hitachi, LTDInventors: Akitomi Semba, Tadashi Sonobe, Takashi Watanabe, Yasuomi Yagi, Junji Sato, Shinsaku Hakuta, Hideaki Mori, Eiji Tsuji, Kenichi Hattori, Atsushi Ishihara
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Patent number: 6201323Abstract: In order to provide a rotating machine in which the temperature increase distribution inside the machine can be equalized, not only is a primary cooler installed in the primary ventilation passage that extends from the exhaust side of the fans and installed on the rotating axis to the suction side of the fans and via the core, but a secondary cooler is installed in the secondary ventilation passage that is branched from the primary ventilation passage, thus making it possible to further cool part of the cooling medium, which has once been cooled by the primary cooler, by means of the secondary cooler, that is, to cool the cooling medium by circulating it through the coolers twice.Type: GrantFiled: November 18, 1999Date of Patent: March 13, 2001Assignee: Hitachi, Ltd.Inventors: Akitomi Semba, Tadashi Sonobe, Takashi Watanabe, Yasuomi Yagi, Junji Sato, Shinsaku Hakuta, Hideaki Mori, Eiji Tsuji, Kenichi Hattori, Atsushi Ishihara
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Patent number: 4926541Abstract: A method of assembling a wound rotor of a vertical type adjustable speed electric rotating machine at a power house of a hydroelectric power plant, with the method including a layer of a rotor body on its side into a pit in the power house with a top surface of an outer circumference of the rotor body extending from the pit to a height sufficient to facilitate a carrying out of field coiling assembling operations by working personnel from a foundation of the power house whereby it is possible to limit an increase in the height of the power house to a sum of an axial length of the assembled rotor body and a height of a crane lifting jig.Type: GrantFiled: August 10, 1989Date of Patent: May 22, 1990Assignee: Hitachi, Ltd.Inventors: Shinsaku Hakuta, Yasuhiro Yasaka, Osamu Nagura, Eiji Tsuji, Makoto Suzuki, Hirotaka Akagawa