Patents by Inventor Yamaha Yoshikazu

Yamaha Yoshikazu 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).

  • Scroll compressor with reverse rotation speed limiter
    Patent number: 5006045
    Abstract: Here is disclosed an air conditioner comprising a scroll type compressor and a brushless DC motor having a rotor provided with a permanent magnet and a stator provided with a sensor adapted to detect a relative position of said rotor and said stator. Here is additionally disclosed an air conditioner in which the rotor of the brushless DC motor comprises a permanent magnet basically made of rare earth elements inclusive of yttrium, transition metal and boron and a driving circuit for the motor includes a braking circuit adapted to excite coils of the motor to thereby reduce reverse rotation of the rotor.
    Type: Grant
    Filed: December 16, 1988
    Date of Patent: April 9, 1991
    Assignees: Seiko Epson Corporation, Diesel Kiki Co., Ltd.
    Inventors: Tatsuya Shimoda, Takeshi Seto, Kenichi Endo, Yamaha Yoshikazu, Nobukazu Takagi