Patents by Inventor Malcolm E. Greenway

Malcolm E. Greenway 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).

  • Mine winder or hoist drum electric motor control for preventing excitation of oscillation
    Patent number: 5377296
    Abstract: The invention provides a control system for an electric motor arranged to drive a rope drum of a mine winder or a hoist system which includes a conveyance supported by a rope and which forms an oscillating system. The control system includes load sensor which monitors the load in the rope and a rope length sensor which monitors the length of rope paid out from the rope drum. A motor control unit is responsive to signals from the sensors and calculates setpoints for speed, acceleration and jerk of the oscillating system. The control unit generates a control signal which is related to a natural oscillation mode of the oscillating system so as to prevent the excitation of oscillations in the system, and controls a motor drive in accordance with the control signal.
    Type: Grant
    Filed: September 18, 1991
    Date of Patent: December 27, 1994
    Inventors: Malcolm E. Greenway, Winfried E. Schmitt, Rodney S. Hamilton