Patents by Inventor Kenichi Iizuka

Kenichi Iizuka 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).

  • Refrigerator control system
    Patent number: 4566289
    Abstract: A novel refrigerator control system is disclosed which comprises an inverter for driving a motor for a compressor, and a change-over device for driving the compressor directly with a commercial power supply when the compressor motor is not driven by the inverter.
    Type: Grant
    Filed: November 9, 1984
    Date of Patent: January 28, 1986
    Assignee: Hitachi, Ltd.
    Inventors: Kenichi Iizuka, Hideo Uzuhashi, Yoshihisa Uneyama, Michiya Matuda, Minoru Kobayashi
  • Control system for a brushless motor
    Patent number: 4051417
    Abstract: In a control system for a brushless motor comprising a power source, a plurality of driving coils and contactless switching elements for intermittently supplying voltage across the power source to the driving coils in response to rotor position signals, rotor position signals are chopped by a chopping signal in which a ratio of a high level period to a low level period can be changed, and a portion of the contactless switching elements is driven by the chopped rotor position signals, thereby controlling the rotating speed of the brushless motor.
    Type: Grant
    Filed: September 4, 1975
    Date of Patent: September 27, 1977
    Assignee: Hitachi, Ltd.
    Inventors: Masaaki Fujinawa, Kiyoo Takeyasu, Kenichi Iizuka, Motokazu Uchida, Hideo Uzuhashi