Patents by Inventor Ken Nagakura
Ken Nagakura 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).
-
Patent number: 11346885Abstract: According to one embodiment, a winding interlayer short-circuit detection apparatus includes a processor configured to perform at least an interlayer short-circuit detecting process to detect, based on a difference between a measurement value of a field current in a field winding of a brushless exciter and a reference value, and based on a difference between a calculated value of an armature reaction voltage induced in the field winding of the brushless exciter and a reference value, a presence or absence of an interlayer short-circuit that may occur in any of the field winding of the brushless exciter, an armature winding of the brushless exciter, and a field winding of a rotary electric machine body.Type: GrantFiled: March 16, 2021Date of Patent: May 31, 2022Assignees: Kabushiki Kaisha Toshiba, Toshiba Energy Systems & Solutions CorporationInventors: Takahiro Sato, Masafumi Fujita, Norio Takahashi, Ken Nagakura, Koji Ando, Yoichi Tomoe
-
Publication number: 20220021277Abstract: In general, according to one embodiment, there is provided an abnormality detection system of a rotary electrical machine. The system includes a plurality of magnetic flux sensors disposed at intervals on a back of a stator core in a circumferential direction or an axial direction, and configured to detect a magnetic flux, and an abnormality detection apparatus configured to detect an abnormality of the stator core from a predetermined event that appears in a composite signal or a differential signal obtained from signals respectively output from at least two magnetic flux sensors of the plurality of magnetic flux sensors.Type: ApplicationFiled: June 28, 2021Publication date: January 20, 2022Applicants: KABUSHIKI KAISHA TOSHIBA, Toshiba Energy Systems & Solutions CorporationInventors: Norio Takahashi, Masafumi Fujita, Takahiro Sato, Takashi Ueda, Ken Nagakura, Masashi Kobayashi, Koji Ando
-
Patent number: 11165291Abstract: A stator core support device according to an embodiment includes plural types of support members that support a stator core on a stator frame disposed radially outward. These support members are combined so as to form a closed circuit portion. Then, an insulating part for electrically insulating part of the closed circuit portion is provided.Type: GrantFiled: July 31, 2018Date of Patent: November 2, 2021Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATIONInventors: Norio Takahashi, Masafumi Fujita, Takahiro Sato, Hideyuki Nakamura, Ken Nagakura, Kazuma Tsujikawa
-
Publication number: 20210293886Abstract: According to one embodiment, a winding interlayer short-circuit detection apparatus includes a processor configured to perform at least an interlayer short-circuit detecting process to detect, based on a difference between a measurement value of a field current in a field winding of a brushless exciter and a reference value, and based on a difference between a calculated value of an armature reaction voltage induced in the field winding of the brushless exciter and a reference value, a presence or absence of an interlayer short-circuit that may occur in any of the field winding of the brushless exciter, an armature winding of the brushless exciter, and a field winding of a rotary electric machine body.Type: ApplicationFiled: March 16, 2021Publication date: September 23, 2021Applicants: KABUSHIKI KAISHA TOSHIBA, Toshiba Energy Systems & Solutions CorporationInventors: Takahiro SATO, Masafumi FUJITA, Norio TAKAHASHI, Ken NAGAKURA, Koji ANDO, Yoichi TOMOE
-
Patent number: 11031832Abstract: According to one embodiment, a stator includes spacing strips disposed to be interposed in the electromagnetic steel plates for each predetermined set of plates of the electromagnetic steel plates, each of the spacing strips extending in a radial direction of the stator iron core to form ventilation ducts, a spacing strip attachment plate which is disposed between the spacing strips and the set of plates of the electromagnetic steel plates to fix the spacing strips, and an insulating layer which covers the entirety of the spacing strip attachment plate and the spacing strips fixed to the spacing strip attachment plate.Type: GrantFiled: April 8, 2019Date of Patent: June 8, 2021Assignees: KABUSHIKI KAISHA TOSHIBA, Toshiba Energy Systems & Solutions CorporationInventors: Shunsuke Ishizaki, Ken Nagakura, Yuichiro Gunji, Norio Takahashi, Masahiro Seki
-
Publication number: 20200028401Abstract: A rotary electric machine and a turbine system including a housing, and a hydrogen generator arranged into or on the housing. The hydrogen generator electrolytically generates hydrogen from water. The hydrogen generator supplies the hydrogen into the housing.Type: ApplicationFiled: July 2, 2019Publication date: January 23, 2020Applicants: Kabushiki Kaisha Toshiba, Toshiba Energy Systems & Solutions CorporationInventors: Tomoyuki Takahashi, Ken Nagakura, Hiroyuki Yoda, Daisuke Murata, Hiroshi Kawakami, Junichi Mori, Masahiro Seki
-
Publication number: 20190312472Abstract: According to one embodiment, a stator includes spacing strips disposed to be interposed in the electromagnetic steel plates for each predetermined set of plates of the electromagnetic steel plates, each of the spacing strips extending in a radial direction of the stator iron core to form ventilation ducts, a spacing strip attachment plate which is disposed between the spacing strips and the set of plates of the electromagnetic steel plates to fix the spacing strips, and an insulating layer which covers the entirety of the spacing strip attachment plate and the spacing strips fixed to the spacing strip attachment plate.Type: ApplicationFiled: April 8, 2019Publication date: October 10, 2019Applicants: KABUSHIKI KAISHA TOSHIBA, Toshiba Energy Systems & Solutions CorporationInventors: Shunsuke ISHIZAKI, Ken NAGAKURA, Yuichiro GUNJI, Norio TAKAHASHI, Masahiro SEKI
-
Publication number: 20190052134Abstract: A stator core support device according to an embodiment includes plural types of support members that support a stator core on a stator frame disposed radially outward. These support members are combined so as to form a closed circuit portion. Then, an insulating part for electrically insulating part of the closed circuit portion is provided.Type: ApplicationFiled: July 31, 2018Publication date: February 14, 2019Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATIONInventors: Norio TAKAHASHI, Masafumi FUJITA, Takahiro SATO, Hideyuki NAKAMURA, Ken NAGAKURA, Kazuma TSUJIKAWA
-
Patent number: 8421302Abstract: According to one embodiment, there is provided a rotating electrical machine including a core, a coil extending from the core, and an electromagnetic shield which is provided outside the core, and has a plurality of shoulders projecting toward the coil. The coil includes an insulator covering outside of a conductor, a resistance layer formed on a surface of the insulator and contacting the core, and at least one potential grading layer formed on a surface of the insulator adjacent to the resistance layer. A boundary between the resistance layer and potential grading layer is provided at a position farther from the core than a point on a surface of the coil, where a distance between the coil and a shoulder of the electromagnetic shield closest to the core is the shortest.Type: GrantFiled: September 28, 2010Date of Patent: April 16, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Takashi Harakawa, Tetsushi Okamoto, Yoshiyuki Inoue, Tooru Ootaka, Hiroshi Hatano, Mikio Kakiuchi, Toshihiko Shinoda, Makoto Kawahara, Masashi Kobayashi, Wataru Nakamura, Ken Nagakura, Masamitsu Sakuma
-
Patent number: 8138653Abstract: A rotating electric machine is provided, where a generator has an increased capacity and a reduced size achieved by electromagnetically effectively utilizing that parts of a rotor core which are outside the narrowest parts of magnetic poles of the rotor core to permit large field current and suppress an increase in temperature of rotor coils. The rotating electric machine includes a stator constructed by winding armature coils around a stator core (1), and a hollow circular cylindrical rotor. The rotor has at least one pair of magnetic poles (2), non-polar portions (3) between the magnetic poles, and interpolar portions (6) arranged in the non-polar portions. In the non-polar portions (3), a plurality of rotor slots (4) are arranged at predetermined intervals. Field windings are wound in each rotor slot (4).Type: GrantFiled: April 18, 2007Date of Patent: March 20, 2012Assignee: Kabushiki Kaisha ToshibaInventors: Yoshihiro Taniyama, Yasuo Kabata, Masafumi Fujita, Tadashi Tokumasu, Norio Takahashi, Masanori Arata, Ken Nagakura
-
Publication number: 20110074241Abstract: According to one embodiment, there is provided a rotating electrical machine including a core, a coil extending from the core, and an electromagnetic shield which is provided outside the core, and has a plurality of shoulders projecting toward the coil. The coil includes an insulator covering outside of a conductor, a resistance layer formed on a surface of the insulator and contacting the core, and at least one potential grading layer formed on a surface of the insulator adjacent to the resistance layer. A boundary between the resistance layer and potential grading layer is provided at a position farther from the core than a point on a surface of the coil, where a distance between the coil and a shoulder of the electromagnetic shield closest to the core is the shortest.Type: ApplicationFiled: September 28, 2010Publication date: March 31, 2011Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Takashi Harakawa, Tetsushi Okamoto, Yoshiyuki Inoue, Tooru Ootaka, Hiroshi Hatano, Mikio Kakiuchi, Toshihiko Shinoda, Makoto Kawahara, Masashi Kobayashi, Wataru Nakamura, Ken Nagakura, Masamitsu Sakuma
-
Patent number: 7863794Abstract: There is provided a 3-phase 2-layer armature winding of a rotating electrical machine. The lead-out connection conductor connected to the output terminal is connected to a coil piece positioned at least farther than a first coil piece inside the phase belt counted from the end of the each phase belt, and a coil piece positioned at the end of the phase belt is connected to a coil piece positioned at least farther than the n-th (n is an integer larger than 1) inside the phase belt counted from the other end of the phase belt in the same parallel circuit, by a jumper wire.Type: GrantFiled: July 12, 2010Date of Patent: January 4, 2011Assignee: Kabushiki Kaisha ToshibaInventors: Masafumi Fujita, Tadashi Tokumasu, Mikio Kakiuchi, Hiroshi Hatano, Takashi Ueda, Ken Nagakura
-
Publication number: 20100277029Abstract: There is provided a 3-phase 2-layer armature winding of a rotating electrical machine. The lead-out connection conductor connected to the output terminal is connected to a coil piece positioned at least farther than a first coil piece inside the phase belt counted from the end of the each phase belt, and a coil piece positioned at the end of the phase belt is connected to a coil piece positioned at least farther than the n-th (n is an integer larger than 1) inside the phase belt counted from the other end of the phase belt in the same parallel circuit, by a jumper wire.Type: ApplicationFiled: July 12, 2010Publication date: November 4, 2010Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Masafumi Fujita, Tadashi Tokumasu, Mikio Kakiuchi, Hiroshi Hatano, Takashi Ueda, Ken Nagakura
-
Publication number: 20100084942Abstract: A rotating electric machine is provided, where a generator has an increased capacity and a reduced size achieved by electromagnetically effectively utilizing that parts of a rotor core which are outside the narrowest parts of magnetic poles of the rotor core to permit large field current and suppress an increase in temperature of rotor coils. The rotating electric machine includes a stator constructed by winding armature coils around a stator core (1), and a hollow circular cylindrical rotor. The rotor has at least one pair of magnetic poles (2), non-polar portions (3) between the magnetic poles, and interpolar portions (6) arranged in the non-polar portions. In the non-polar portions (3), a plurality of rotor slots (4) are arranged at predetermined intervals. Field windings are wound in each rotor slot (4).Type: ApplicationFiled: April 18, 2007Publication date: April 8, 2010Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yoshihiro Taniyama, Yasuo Kabata, Masafumi Fujita, Tadashi Tokumasu, Norio Takahashi, Masanori Arata, Ken Nagakura