Patents by Inventor Stephen Geoffrey Lund-lack

Stephen Geoffrey Lund-lack 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).

  • Driver for levitation coils of a magnetic bearing
    Patent number: 5649814
    Abstract: An apparatus for driving levitation coils of a magnetic bearing provided with a DC power source and a motor drive device powered by the power source. A DC motor is driven by the motor drive and the output from the motor is linked to a switching amplifier. The output from the amplifier is linked to the levitation coils of the magnetic bearing. A feedback control is provided from the magnetic bearing to the amplifier to position a rotor associated with the levitation coils in response to the amplifier output. The DC power source also directly powers the switching amplifier.
    Type: Grant
    Filed: May 3, 1995
    Date of Patent: July 22, 1997
    Assignee: The BOC Group plc
    Inventor: Stephen Geoffrey Lund-lack