Patents by Inventor Yasuo Takahasi

Yasuo Takahasi 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).

  • DC Motor control system
    Patent number: 4300079
    Abstract: A DC motor control system which has means for detecting the rise and fall of a drive command signal to generate an ON ACCELERATION/DECELERATION signal and means for generating a current limit signal for driving a DC motor by the ON ACCELERATION/DECELERATION signal to produce a rated output and for driving the DC motor to produce an output 1/n times the rated output when the DC motor is switched from an acceleration state to a stationary state. When the DC motor is accelerated or decelerated by the drive command signal, a current for obtaining the rated output is applied to the armature of the DC motor and, in the stationary state, even when a load on the DC motor is maximum a current for obtaining an output 1/n times the rated output is applied to the armature of the DC motor to reduce the output of the large-output DC motor, thereby providing an enlarged constant output DC motor range.
    Type: Grant
    Filed: April 23, 1979
    Date of Patent: November 10, 1981
    Assignee: Fujitsu Fanuc Limited
    Inventors: Shigeki Kawada, Yoshiki Fujioka, Naoto Ohta, Yasuo Takahasi