Patents by Inventor Graham T. Fordyce

Graham T. Fordyce 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).

  • SYSTEMS AND METHODS FOR INDUCTIVELY COUPLED DAMPER FOR DIRECT CURRENT POWER SYSTEMS
    Publication number: 20140375405
    Abstract: An electrical system for generating a reliable power source for starting an engine, including a first interface to a direct current power source and a second interface to an inverter. The inverter is coupled to a generator. An inductive damper is coupled to the direct current power source via the first interface and to the inverter via the second interface. The inductive damper comprises a primary winding, a secondary winding, and a resistor coupled to the secondary winding. The inductive damper operates to galvanically isolate the resistor from the direct current power source during a startup operation of the generator. An associated method is also disclosed.
    Type: Application
    Filed: March 7, 2014
    Publication date: December 25, 2014
    Applicant: Hamilton Sundstrand Corporation
    Inventors: Kurt W. Duesterhoeft, Graham T. Fordyce
  • Inverter with high frequency isolation transformer
    Patent number: 8305781
    Abstract: An inverter receives a DC power supply and converts it into AC power to a primary coil of a high frequency transformer. The output of the high frequency transformer passes through two secondary coils, and each secondary coil is associated with a bus. The busses supply positive and negative AC power to a downstream output. The flow of the power from the two busses is alternatively controlled to provide a desired frequency on the output.
    Type: Grant
    Filed: April 30, 2008
    Date of Patent: November 6, 2012
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Gregory I. Rozman, Graham T. Fordyce
  • INVERTER WITH HIGH FREQUENCY ISOLATION TRANSFORMER
    Publication number: 20090273952
    Abstract: An inverter receives a DC power supply and converts it into AC power to a primary coil of a high frequency transformer. The output of the high frequency transformer passes through two secondary coils, and each secondary coil is associated with a bus. The busses supply positive and negative AC power to a downstream output. The flow of the power from the two busses is alternatively controlled to provide a desired frequency on the output.
    Type: Application
    Filed: April 30, 2008
    Publication date: November 5, 2009
    Inventors: Gregory I. Rozman, Graham T. Fordyce
  • Integrated inductive assembly
    Patent number: 6118362
    Abstract: An integrated inductive assembly includes first and second inductive elements each comprising a winding wherein winding axes of the windings are perpendicular to one another. In addition, the first and second inductive elements are carried adjacent one another by a bracket.
    Type: Grant
    Filed: January 24, 1997
    Date of Patent: September 12, 2000
    Assignee: Sundstrand Corporation
    Inventors: Ian Tinkler, Terry J. Milroy, Graham T. Fordyce
  • Relative angel estimation apparatus for a sensorless switched reluctance machine system
    Patent number: 5867004
    Abstract: A control for operating an inverter coupled to a switched reluctance machine includes a relative angle estimation circuit for estimating rotor angle for a phase in the switched reluctance machine. The relative angle estimation circuit estimates a phase voltage and thereby calculates phase flux linkage to estimate the rotor angle.
    Type: Grant
    Filed: April 9, 1996
    Date of Patent: February 2, 1999
    Assignee: Sundstrand Corporation
    Inventors: Barry T. Drager, Stephen R. Jones, Graham T. Fordyce