Patents by Inventor Stephen J Worrall

Stephen J Worrall 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).

  • Dual ring dedicated drive control system for medium voltage variable frequency drives
    Patent number: 7944157
    Abstract: The present invention provides a motor drive system that is substantially more robust than those of the prior art. Generally, the motor drive system provides a redundant communication topology with the drives, thereby greatly reducing the chance of failure by a fault in the drive-to-drive communication link. Specifically, the motor drive system includes a plurality of motor drives joined by a communication media. Each motor drive has a motor control circuit configured to control the speed of an electric motor and a media access control unit having two communication modules. Each communications module includes a transmitter and a receiver joined to the communications media. A set of routing switches in the media access control unit joins the communication modules to connect the motor drives in an independent primary and a secondary ring communicating data for controlling the motor drives.
    Type: Grant
    Filed: January 14, 2008
    Date of Patent: May 17, 2011
    Assignee: Rockwell Automation Technologies, Inc.
    Inventor: Stephen J Worrall
  • DUAL RING DEDICATED DRIVE CONTROL SYSTEM FOR MEDIUM VOLTAGE VARIABLE FREQUENCY DRIVES
    Publication number: 20090179600
    Abstract: The present invention provides a motor drive system that is substantially more robust than those of the prior art. Generally, the motor drive system provides a redundant communication topology with the drives, thereby greatly reducing the chance of failure by a fault in the drive-to-drive communication link. Specifically, the motor drive system includes a plurality of motor drives joined by a communication media. Each motor drive has a motor control circuit configured to control the speed of an electric motor and a media access control unit having two communication modules. Each communications module includes a transmitter and a receiver joined to the communications media. A set of routing switches in the media access control unit joins the communication modules to connect the motor drives in an independent primary and a secondary ring communicating data for controlling the motor drives.
    Type: Application
    Filed: January 14, 2008
    Publication date: July 16, 2009
    Inventor: Stephen J. Worrall
  • SERIAL BACKPLANE FOR MEDIUM VOLTAGE MOTOR DRIVE SYSTEM
    Publication number: 20090066282
    Abstract: A hybrid backplane uses multiple, parallel serial communication channels to provide flexibility and robustness in a motor drive control requiring high-speed data communication for the real-time control of motor waveforms.
    Type: Application
    Filed: September 10, 2007
    Publication date: March 12, 2009
    Inventor: Stephen J. Worrall