Patents by Inventor Bruce Phillip Bushey

Bruce Phillip Bushey 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).

  • Back EMF actuator control
    Patent number: 7020576
    Abstract: A control system for estimating the approximate relative position of an electric linear actuator on a surface maintenance machine. The control system includes device for selectively coupling the electric motor of the linear actuator to the electric power source, device for measuring or estimating the current and voltage of the electric motor, device for estimating the motor speed based on the measured values of current and voltage, and storage device for storing values of estimated motor speed and integrating device for determining approximate linear actuator position, wherein the integrating device integrates the motor speed over time to determine the approximate position of the linear actuator position.
    Type: Grant
    Filed: May 26, 2004
    Date of Patent: March 28, 2006
    Assignee: Tennant Company
    Inventors: Musibau O. Alowonle, Bruce Phillip Bushey, Robert J. Erko, Paul Leonard Groschen, Jr., Richard F. Milun