Patents by Inventor Zoran V. Vrankovic

Zoran V. Vrankovic 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).

  • Method and apparatus for detecting a location of ground faults in a motor/motor drive combination
    Patent number: 8593150
    Abstract: A motor drive system provides for analysis of current flow in the DC bus to identify ground faults and their locations. Low-frequency positive polarity and negative polarity current differences indicate ground faults from the positive DC bus and negative DC bus respectively. High-frequency signals indicate ground faults in the motor windings and connecting leads.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: November 26, 2013
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Zoran V. Vrankovic, Lixiang Wei, Gary L. Skibinski, Craig R. Winterhalter
  • Ground fault detection system and method
    Patent number: 8433528
    Abstract: A ground fault detection system is provided. The ground fault detection system includes a magnetic core having first and second primary legs and a secondary leg disposed between the first and second primary legs. The ground fault detection system also includes first and second primary windings disposed around the first and second primary legs respectively and configured to introduce current in the first and second primary legs. Further, the ground fault detection system includes first and second secondary windings disposed around the first and second primary legs respectively and configured to detect a ground fault based upon a magnetic flux generated in response to the introduced current.
    Type: Grant
    Filed: December 18, 2009
    Date of Patent: April 30, 2013
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Craig R. Winterhalter, Lixiang Wei, Zoran V. Vrankovic
  • Ground Fault Detection and Location System and Method for Motor Drives
    Publication number: 20120112757
    Abstract: A motor drive system provides for analysis of current flow in the DC bus to identify ground faults and their locations. Low-frequency positive polarity and negative polarity current differences indicate ground faults from the positive DC bus and negative DC bus respectively. High-frequency signals indicate ground faults in the motor windings and connecting leads.
    Type: Application
    Filed: November 10, 2010
    Publication date: May 10, 2012
    Inventors: Zoran V. Vrankovic, Lixiang Wei, Gary L. Skibinski, Craig R. Winterhalter
  • GROUND FAULT DETECTION SYSTEM AND METHOD
    Publication number: 20110153234
    Abstract: A ground fault detection system is provided. The ground fault detection system includes a magnetic core having first and second primary legs and a secondary leg disposed between the first and second primary legs. The ground fault detection system also includes first and second primary windings disposed around the first and second primary legs respectively and configured to introduce current in the first and second primary legs. Further, the ground fault detection system includes first and second secondary windings disposed around the first and second primary legs respectively and configured to detect a ground fault based upon a magnetic flux generated in response to the introduced current.
    Type: Application
    Filed: December 18, 2009
    Publication date: June 23, 2011
    Applicant: Rockwell Automation Technologies, Inc.
    Inventors: Craig R. Winterhalter, Lixiang Wei, Zoran V. Vrankovic