Patents by Inventor Yutaro KITAMORI

Yutaro KITAMORI 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).

  • Over-voltage prevention device and current rectifying circuit
    Patent number: 9548685
    Abstract: According to one embodiment, an over-voltage prevention device includes a first short-circuit device provided between a secondary side of a wound-rotor induction machine and a frequency converter configured to excite the secondary side by a three-phase AC current and having a function of short-circuiting between phases of the three-phase AC current, resistors each connected between the first short-circuit device and the frequency converter for each phase, and second short-circuit devices connected respectively to the resistors in parallel and having a function of short-circuiting between the frequency converter and the secondary side of the wound-rotor induction machine.
    Type: Grant
    Filed: January 26, 2015
    Date of Patent: January 17, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Ryuta Hasegawa, Teruyuki Ishizuki, Takashi Fujita, Takahisa Kageyama, Yutaro Kitamori, Sho Sato
  • Over-voltage prevention device
    Patent number: 9478972
    Abstract: According to one embodiment, an over-voltage prevention device is provided between a secondary-winding side of a wound-rotor induction machine and a frequency converter configured to excite the secondary-winding side of the wound-rotor induction machine through a three-phase excitation power supply line. The over-voltage prevention device includes a first short-circuit device having a function of short-circuiting between phases of the excitation power supply line, and a second short-circuit device having a function of short-circuiting between phases of the excitation power supply line with a short-circuit impedance greater than a short-circuit impedance of the first short-circuit device.
    Type: Grant
    Filed: February 6, 2015
    Date of Patent: October 25, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yutaro Kitamori, Takahisa Kageyama, Teruyuki Ishizuki, Takashi Fujita
  • OVER-VOLTAGE PREVENTION DEVICE
    Publication number: 20150229120
    Abstract: According to one embodiment, an over-voltage prevention device is provided between a secondary-winding side of a wound-rotor induction machine and a frequency converter configured to excite the secondary-winding side of the wound-rotor induction machine through a three-phase excitation power supply line. The over-voltage prevention device includes a first short-circuit device having a function of short-circuiting between phases of the excitation power supply line, and a second short-circuit device having a function of short-circuiting between phases of the excitation power supply line with a short-circuit impedance greater than a short-circuit impedance of the first short-circuit device.
    Type: Application
    Filed: February 6, 2015
    Publication date: August 13, 2015
    Inventors: Yutaro KITAMORI, Takahisa Kageyama, Teruyuki Ishizuki, Takashi Fujita
  • OVER-VOLTAGE PREVENTION DEVICE AND CURRENT RECTIFYING CIRCUIT
    Publication number: 20150214870
    Abstract: According to one embodiment, an over-voltage prevention device includes a first short-circuit device provided between a secondary side of a wound-rotor induction machine and a frequency converter configured to excite the secondary side by a three-phase AC current and having a function of short-circuiting between phases of the three-phase AC current, resistors each connected between the first short-circuit device and the frequency converter for each phase, and second short-circuit devices connected respectively to the resistors in parallel and having a function of short-circuiting between the frequency converter and the secondary side of the wound-rotor induction machine.
    Type: Application
    Filed: January 26, 2015
    Publication date: July 30, 2015
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Ryuta HASEGAWA, Teruyuki ISHIZUKI, Takashi FUJITA, Takahisa KAGEYAMA, Yutaro KITAMORI, Sho SATO