Patents by Inventor Masahiko Hanazawa

Masahiko Hanazawa 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: 5656911
    Abstract: A driving device controls a permanent-magnet synchronous motor having a permanent magnet in its rotor using a voltage-type inverter supplying drive power for the synchronous motor, makes the torque of the synchronous motor and the d-axis current flowing in the synchronous motor in the direction of the magnetic flux generated by the permanent magnet approach their own command values, and performs weakening field control by decreasing the d-axis current. To perform the above described control without complicated d-axis current command value operations or temperature amendments to motor constants, the driving device includes a proportional controller for outputting a d-axis signal proportional to the deviation between a d-axis current detection value and a d-axis current command value for the motor.
    Type: Grant
    Filed: December 20, 1995
    Date of Patent: August 12, 1997
    Assignees: Fuji Electric Company, Nissan Motor Company
    Inventors: Tomoharu Nakayama, Koetsu Fujita, Shigenori Kinoshita, Takao Yanase, Masahiko Hanazawa, Shinichiro Kitada, Toshio Kikuchi, Takeshi Aso