Patents by Inventor Andrew J. Forsyth

Andrew J. Forsyth 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).

  • Synchronous electrical machine
    Patent number: 8395346
    Abstract: A synchronous electrical machine having a plurality of phases, a detecting unit arranged to detect a fault in at least one of the phases of the synchronous electrical machine, an isolating unit arranged to isolate the at least one phase of the synchronous electrical machine with the fault, a phase shift unit arranged to produce a controlled phase shift between the voltage and the current within the remaining phases of the synchronous electrical machine to adjust the phase angle and magnitude of the second harmonic powers produced by the remaining phases of the synchronous electrical machine such that the vector sum of the second harmonic power vectors of the remaining phases of the synchronous electrical machine is zero.
    Type: Grant
    Filed: June 13, 2008
    Date of Patent: March 12, 2013
    Assignee: Rolls-Royce PLC
    Inventors: David R Trainer, John J A Cullen, Alan J Mitcham, Andrew M Cross, Andrew J Forsyth, Ahmed A-M Abdel-Hafez
  • SYNCHRONOUS ELECTRICAL MACHINE
    Publication number: 20100117569
    Abstract: A synchronous electrical machine comprising a plurality of phases, detecting means arranged to detect a fault in at least one of the phases of the synchronous electrical machine, isolating means arranged to isolate the at least one phase of the synchronous electrical machine with the fault, phase shift means arranged to produce a controlled phase shift between the voltage and the current within the remaining phases of the synchronous electrical machine to adjust the phase angle and magnitude of the second harmonic powers produced by the remaining phases of the synchronous electrical machine such that the vector sum of the second harmonic power vectors of the remaining phases of the synchronous electrical machine is zero.
    Type: Application
    Filed: June 13, 2008
    Publication date: May 13, 2010
    Applicant: Rolls-Royce PLC
    Inventors: David R. Trainer, John J.A. Cullen, Alan J. Mitcham, Andrew M. Cross, Andrew J. Forsyth, Ahmed A-M Abdel-Hafez
  • Multi-pulse converter circuits
    Patent number: 7148661
    Abstract: An AC to DC converter with harmonic suppression is provided. The harmonic suppression is provided by forcing an instantaneous current conflict between series connected rectifier bridges 54, 80, such that a voltage waveform at 6 times the AC supply frequency of the AC supply is automatically generated. This waveform is then injected via a injection circuit to give harmonic cancellation.
    Type: Grant
    Filed: October 20, 2004
    Date of Patent: December 12, 2006
    Assignee: Goodrich Control Systems Limited
    Inventors: David Trainer, Andrew J. Forsyth, Francisco J. Chivite-Zabalza