Patents by Inventor Keishiro Igarashi

Keishiro Igarashi 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).

  • Control apparatus for compressor with induction motor
    Patent number: 5506486
    Abstract: A control apparatus for compressor with induction motor includes a microcomputer which evaluates an optimum number of rotations at which an operation efficiency of a compressor becomes a maximum when a frequency of an alternating current electric power applied to an induction motor in accordance with a change of a load. An inverter circuit is controlled by the microcomputer, and therefore, a voltage outputted from the inverter circuit is adjusted such that the induction motor becomes the optimum number of rotations.
    Type: Grant
    Filed: August 20, 1993
    Date of Patent: April 9, 1996
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Norio Hayashi, Takashi Ogawa, Masaaki Takezawa, Keishiro Igarashi