Patents by Inventor Shunya Morita

Shunya Morita 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).

  • Adjustable speed drive system for primary loop recirculation pump
    Patent number: 7692333
    Abstract: An adjustable speed drive system for a primary loop recirculation pump and method of control in which a first breaker is connected to an auxiliary power supply system, an inverter is connected to the first breaker, a second breaker is connected to an output of the inverter, a gate driver supplies a gate pulse to the inverter, and an inverter control portion drives the gate driver. The adjustable speed drive system is combined with a backup adjustable speed drive system. When a malfunction in a main adjustable speed drive circuit portion including the inverter and the gate driver in the adjustable speed drive system used in a normal operation is detected, the main adjustable speed drive circuit portion is switched to the backup adjustable speed drive system, and an operation of a recirculation pump motor for driving a recirculation pump that controls a flow of a reactor core is continued.
    Type: Grant
    Filed: September 15, 2008
    Date of Patent: April 6, 2010
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Yukihiro Katayama, Masashi Sugiyama, Shunya Morita, Hirohisa Satomi
  • Adjustable Speed Drive System For Primary Loop Recirculation Pump
    Publication number: 20090009000
    Abstract: An adjustable speed drive system for a primary loop recirculation pump and method of control in which a first breaker is connected to an auxiliary power supply system, an inverter is connected to the first breaker, a second breaker is connected to an output of the inverter, a gate driver supplies a gate pulse to the inverter, and an inverter control portion drives the gate driver. The adjustable speed drive system is combined with a backup adjustable speed drive system. When a malfunction in a main adjustable speed drive circuit portion including the inverter and the gate driver in the adjustable speed drive system used in a normal operation is detected, the main adjustable speed drive circuit portion is switched to the backup adjustable speed drive system, and an operation of a recirculation pump motor for driving a recirculation pump that controls a flow of a reactor core is continued.
    Type: Application
    Filed: September 15, 2008
    Publication date: January 8, 2009
    Inventors: Yukihiro Katayama, Masashi Sugiyama, Shunya Morita, Hirohisa Satomi
  • Adjustable speed drive system for primary loop recirculation pump
    Patent number: 7429807
    Abstract: An adjustable speed drive system for a primary loop recirculation pump capable of keeping a PLR pump operating even if a single malfunction occurred in a main adjustable speed drive circuit portion. The drive system for the primary loop recirculation pump has a backup main adjustable speed drive circuit portion, and a breaker for switching between an incoming destination and an outputting destination of the backup main adjustable speed drive circuit portion. A control signal of an inverter control portion is switched to control an inverter included in the backup main adjustable speed drive circuit portion, and when a malfunction occurred in the adjustable speed drive main circuit, by switching to the backup main adjustable speed drive circuit portion, the primary loop recirculation pump of a nuclear reactor is continuously controlled and operated.
    Type: Grant
    Filed: April 10, 2006
    Date of Patent: September 30, 2008
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Yukihiro Katayama, Masashi Sugiyama, Shunya Morita, Hirohisa Satomi
  • Adjustable speed drive system for primary loop recirculation pump
    Publication number: 20060256912
    Abstract: An adjustable speed drive system for a primary loop recirculation pump capable of keeping a PLR pump operating even if a single malfunction occurred in a main adjustable speed drive circuit portion. The drive system for the primary loop recirculation pump has a backup main adjustable speed drive circuit portion, and a breaker for switching between an incoming destination and an outputting destination of the backup main adjustable speed drive circuit portion. A control signal of an inverter control portion is switched to control an inverter included in the backup main adjustable speed drive circuit portion, and when a malfunction occurred in the adjustable speed drive main circuit, by switching to the backup main adjustable speed drive circuit portion, the primary loop recirculation pump of a nuclear reactor is continuously controlled and operated.
    Type: Application
    Filed: April 10, 2006
    Publication date: November 16, 2006
    Inventors: Yukihiro Katayama, Masashi Sugiyama, Shunya Morita, Hirohisa Satomi