Patents by Inventor Geoffrey Thomas Brown

Geoffrey Thomas Brown 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).

  • Control of a switched reluctance machine
    Patent number: 5894210
    Abstract: A normalization circuit for a phase energization controller receives a rotor position value from a position encoder, and the normalization circuit obtains a normalized rotor position for each phase of a switched reluctance machine. Accordingly, the normalization circuit simplifies the detection of commutation positions for all the machine phases by reducing the commutation position determination to that of a single phase. Also, an initialization circuit for the phase energization controller energizes one or more phases of the switched reluctance motor to set the rotor of the switched reluctance motor to a preferred position to determine an offset value.
    Type: Grant
    Filed: July 19, 1996
    Date of Patent: April 13, 1999
    Assignee: Switched Reluctance Drives Ltd.
    Inventors: Geoffrey Thomas Brown, Michael James Turner, Pol Remi Avet
  • Compensation for input voltage variation in an electric motor drive
    Patent number: 5724477
    Abstract: The present invention employs digital circuitry to compensate for variations in DC link voltage transmitted to a switched reluctance machine. The digital voltage compensation system of the present invention periodically samples the DC link voltage and actual rotor speed, then supplies the samples in digital form to a microcontroller that derives a compensated speed signal to compensate for changes in DC link voltage.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: March 3, 1998
    Assignee: Switched Reluctance Drives, Ltd.
    Inventors: Paul Donald Webster, Geoffrey Thomas Brown, David Mark Sugden