Patents by Inventor Steven Hartig

Steven Hartig 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).

  • Voltage source inverter filter with resistor failure detection circuit
    Patent number: 10088517
    Abstract: A motor drive system output filter includes fault detection. A variable frequency drive (VFD) drives a three phase AC induction motor. A filter circuit is connected between the VFD and the AC induction motor. The filter circuit comprises a filter for each phase. Each filter comprises an inductor and a damping resistor connected in series with a blocking capacitor across the inductor. A plurality of detection circuits are provided, one for each phase. Each detection circuit is connected to the capacitor of the associated phase for detecting capacitor voltage to indicate a resistor fault condition.
    Type: Grant
    Filed: October 7, 2016
    Date of Patent: October 2, 2018
    Assignee: Yaskawa America, Inc.
    Inventors: Mahesh M. Swamy, Mark Baumgardner, Steven Hartig, Daniel Nitzsche
  • VOLTAGE SOURCE INVERTER FILTER WITH RESISTOR FAILURE DETECTION CIRCUIT
    Publication number: 20180100889
    Abstract: A motor drive system output filter includes fault detection. A variable frequency drive (VFD) drives a three phase AC induction motor. A filter circuit is connected between the VFD and the AC induction motor. The filter circuit comprises a filter for each phase. Each filter comprises an inductor and a damping resistor connected in series with a blocking capacitor across the inductor. A plurality of detection circuits are provided, one for each phase. Each detection circuit is connected to the capacitor of the associated phase for detecting capacitor voltage to indicate a resistor fault condition.
    Type: Application
    Filed: October 7, 2016
    Publication date: April 12, 2018
    Inventors: Mahesh M. Swamy, Mark Baumgardner, Steven Hartig, Daniel Nitzsche