Patents by Inventor Kouji Hamaoka

Kouji Hamaoka 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: 6014004
    Abstract: When a lock detector detects a locked state of a DC motor in a starting stage, a torque increasing circuit immediately selects a starting sequence pattern of an output torque that is greater in magnitude by one preselected step, and outputs the selected output torque to a starting sequence controller, so that a compressor can be restarted speedily without repeating starting failures. A compressor, driven by a DC motor, has a shell of an internal pressure approximately equal to the pressure of an inhalation gas. An inverter is provided to make the speed of the DC motor variable. A rotational frequency setting circuit sets the rotational frequency of the DC motor to a frequency that is not greater than the frequency of a commercial power source when the internal temperature of a refrigerator is stabilized. By this construction, the power consumption can be remarkably reduced.
    Type: Grant
    Filed: October 20, 1998
    Date of Patent: January 11, 2000
    Assignee: Matsushita Refrigeration Company
    Inventors: Kouji Hamaoka, Keiji Ogawa, Koyo Shibuya, Takashi Satomura, Hideharu Ogahara, Yasuhiro Tsujii, Kazunori Kurimoto
  • Patent number: 5970733
    Abstract: When a lock detector detects a locked state of a DC motor in a starting stage, a torque increasing circuit immediately selects a starting sequence pattern of an output torque that is greater in magnitude by one preselected step, and outputs the selected output torque to a starting sequence controller, so that a compressor can be restarted speedily without repeating starting failures. A compressor, driven by a DC motor, has a shell of an internal pressure approximately equal to the pressure of an inhalation gas. An inverter is provided to make the speed of the DC motor variable. A rotational frequency setting circuit sets the rotational frequency of the DC motor to a frequency that is not greater than the frequency of a commercial power source when the internal temperature of a refrigerator is stabilized. By this construction, the power consumption can be remarkably reduced.
    Type: Grant
    Filed: October 20, 1998
    Date of Patent: October 26, 1999
    Assignee: Matsushita Refrigeration Company
    Inventors: Kouji Hamaoka, Keiji Ogawa, Koyo Shibuya, Takashi Satomura, Hideharu Ogahara, Yasuhiro Tsujii, Kazunori Kurimoto
  • Patent number: 5857349
    Abstract: When a lock detector detects a locked state of a DC motor in a starting stage, a torque increasing circuit immediately selects a starting sequence pattern of an output torque that is greater in magnitude by one preselected step, and outputs the selected output torque to a starting sequence controller, so that a compressor can be restarted speedily without repeating starting failures. A compressor, driven by a DC motor, has a shell of an internal pressure approximately equal to the pressure of an inhalation gas. An inverter is provided to make the speed of the DC motor variable. A rotational frequency setting circuit sets the rotational frequency of the DC motor to a frequency that is not greater than the frequency of a commercial power source when the internal temperature of a refrigerator is stabilized. By this construction, the power consumption can be remarkably reduced.
    Type: Grant
    Filed: November 13, 1996
    Date of Patent: January 12, 1999
    Assignee: Matsushita Refrigeration Company
    Inventors: Kouji Hamaoka, Keiji Ogawa, Koyo Shibuya, Takashi Satomura, Hideharu Ogahara, Yasuhiro Tsujii, Kazunori Kurimoto
  • Patent number: 4888533
    Abstract: A brushless DC motor useful as a driving source of a refrigerant compressor of a refrigerating apparatus or a fan. A position detecting means generates a control signal by detecting the terminal voltage on input-output terminals current to three-phase rotor drive coils. Filters convert the detected terminal voltages to smoothed signals. A mixing means generates three kinds of mixed signal from the smoothed signal and comparing means generates the control signal for switching a current path to the three-phase coils by a signal made by comparing the mixed signal with the smoothed signal. The current path to the coils is switched by a switching-driving part in turn on the basis of the control signal of the position detecting means.The present invention provides a brushless DC motor wherein current flowing to the drive coils can be switched without special position detecting elements.
    Type: Grant
    Filed: February 22, 1988
    Date of Patent: December 19, 1989
    Inventors: Makoto Gotoh, Kouji Hamaoka