Patents by Inventor Shota Okai

Shota Okai 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: 6577092
    Abstract: A DC motor control apparatus includes Hall effect devices each generating a pulse each time a DC motor rotates a predetermined angle. When a control circuit judges, based on the pulse signals generated by the Hall effect devices, that the rotation rate of the motor has decreased below a predetermined rate, with a command to stop the motor given, the control circuit generates a servo command signal. When the servo command signal is generated, the control signal also generates, based on the pulse signals, a rotation direction indicating signal to indicate that the motor should be driven to rotate in the opposite direction. After generating the servo command signal, the control circuit generates and holds a braking force indicating signal indicating the braking force in accordance with the actual rotation rate of the motor. A driver drives the motor in the direction indicated by the rotation direction indicating signal with a braking force indicated by the braking force indicating signal.
    Type: Grant
    Filed: January 22, 2002
    Date of Patent: June 10, 2003
    Assignee: Itoh Electric Company, Limited
    Inventor: Shota Okai
  • Publication number: 20020101212
    Abstract: A DC motor control apparatus includes Hall effect devices each generating a pulse each time a DC motor rotates a predetermined angle. When a control circuit judges, based on the pulse signals generated by the Hall effect devices, that the rotation rate of the motor has decreased below a predetermined rate, with a command to stop the motor given, the control circuit generates a servo command signal. When the servo command signal is generated, the control signal also generates, based on the pulse signals, a rotation direction indicating signal to indicate that the motor should be driven to rotate in the opposite direction. After generating the servo command signal, the control circuit generates and holds a braking force indicating signal indicating the braking force in accordance with the actual rotation rate of the motor. A driver drives the motor in the direction indicated by the rotation direction indicating signal with a braking force indicated by the braking force indicating signal.
    Type: Application
    Filed: January 22, 2002
    Publication date: August 1, 2002
    Inventor: Shota Okai