Patents by Inventor David Rodal

David Rodal 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).

  • Adaptive digitally controlled motor drive system and method
    Patent number: 4749927
    Abstract: A digitally controlled motor drive system using a pulse width modulated motor drive receives a desired motor velocity signal and an actual motor velocity signal and it provides a corresponding velocity error signal. The velocity error signal is adjusted in response to a change in the value of a power voltage supplied to the motor. The velocity error signal may be compensated for back electromotive force and/or for static friction in the motor, if desired. The system is simple, reliable and cost effective.
    Type: Grant
    Filed: April 11, 1986
    Date of Patent: June 7, 1988
    Assignee: Ampex Corporation
    Inventors: David Rodal, Nathan Osborn, Robert Steele