Patents by Inventor Yasushi Momochi

Yasushi Momochi 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: 4245182
    Abstract: A field control apparatus for a generator having a field winding comprises a terminal voltage control unit for controlling a field current of the generator in accordance with a difference between a terminal voltage signal of the generator and a reference voltage signal, which control unit has at least one of a line drop compensation function, an under-excitation limitation function, an over-excitation limitation function, a power factor regulation function, an armature winding over-current compensation function and a cross-current compensation function. The field control apparatus includes a detector as a common signal source for detecting active power and reactive power components at an output terminal of the generator and means responsive to the output of the detector for performing scalar operation in accordance with a function of the added compensation/control function described above.
    Type: Grant
    Filed: March 28, 1978
    Date of Patent: January 13, 1981
    Assignees: Hitachi, Ltd., Hitachi Engineering Co., Ltd.
    Inventors: Hiroaki Aotsu, Akira Isono, Masuo Goto, Koichi Kimura, Yasushi Momochi, Takaaki Kai, Satoshi Kitamura, Akihisa Kaihara, Hirosi Okada
  • Patent number: 4129818
    Abstract: Disclosed is an apparatus for carrying out normal stop of a synchronous generator in an advantageous manner without use of a field breaker. The apparatus comprises a six-phase thyristor converter for controlling field excitation of the synchronous generator in dependence upon terminal voltage thereof, which converter exhibits not only a forward conversion function (power rectifier) but also backward conversion function (power inverter). When a generator operation stop command is produced, the operation of the converter in power rectifier mode is changed over to power inverter mode.
    Type: Grant
    Filed: June 15, 1977
    Date of Patent: December 12, 1978
    Assignee: Hitachi, Ltd.
    Inventors: Masuo Goto, Akira Isono, Yasushi Momochi, Takaaki Kai
  • Patent number: 4118749
    Abstract: An apparatus for protecting a synchronous machine from a field overvoltage is disclosed. The apparatus comprises a field excitation control circuit which is impressed with the armature voltage of the synchronous machine so as to provide a DC power supply for producing a DC output to excite the field winding of the synchronous machine, a first discharge circuit which is adapted to discharge the stored energy of the field winding when the synchronous machine is to be tripped under predetermined conditions, and a second discharge circuit for reducing the field voltage by allowing a field current to flow therethrough in response to generation of an overvoltage whose absolute value is higher than a predetermined level, across the field winding.
    Type: Grant
    Filed: March 30, 1977
    Date of Patent: October 3, 1978
    Assignee: Hitachi, Ltd.
    Inventors: Takeshi Matuzaki, Masuo Goto, Yasushi Momochi