Patents by Inventor Kevin Daffey

Kevin Daffey 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).

  • Patent number: 8216008
    Abstract: A mixed propulsion system for a seagoing vessel such as a liquid natural gas carrier including a gas turbine engine is described. The vessel has at least one electric propulsion drive and a plurality of prime movers of different types each coupled directly to drive an electrical generator. The outputs of the several generators are connected to at least two electricity distribution switchboards to supply the power requirements of the vessel, and each electric propulsion drive is cross-coupled to receive power selectively from either switchboard such that in the event of a single failure in a switchboard or prime mover or both power can be maintained to both propulsion drives.
    Type: Grant
    Filed: October 8, 2007
    Date of Patent: July 10, 2012
    Assignee: Rollys-Royce PLC
    Inventor: Kevin Daffey
  • Publication number: 20100320954
    Abstract: A system is provided for measuring the rotational velocity of the rotor of an electric motor or generator having (i) a stator with a plurality of circumferentially spaced pole pieces, each pole piece having a corresponding armature winding, and (ii) a rotor with a plurality of circumferentially spaced magnet portions, the armature windings interacting with the magnetic field produced by the magnet portions. The system includes one or more voltage sensing coils. The or each voltage sensing coil is adapted to encircle a respective pole piece of the stator such that a time-varying electromotive force is induced in the voltage sensing coil as the magnet portions of the rotor pass by the pole piece. The system further includes is a detector for detecting the time-varying electromotive force induced in the or each voltage sensing coil, and determining the rotational velocity of the rotor from the time between peaks in the induced electromotive force.
    Type: Application
    Filed: June 11, 2010
    Publication date: December 23, 2010
    Applicant: ROLLS-ROYCE PLC
    Inventors: Vincent A. Lowe, Kevin Daffey
  • Publication number: 20090215328
    Abstract: A mixed propulsion system for a seagoing vessel such as a liquid natural gas carrier including a gas turbine engine is described. The vessel has at least one electric propulsion drive and a plurality of prime movers of different types each coupled directly to drive an electrical generator. The outputs of the several generators are connected to at least two electricity distribution switchboards to supply the power requirements of the vessel, and each electric propulsion drive is cross-coupled to receive power selectively from either switchboard such that in the event of a single failure in a switchboard or prime mover or both power can be maintained to both propulsion drives.
    Type: Application
    Filed: October 8, 2007
    Publication date: August 27, 2009
    Applicant: ROLLS-ROYCE PLC
    Inventor: Kevin Daffey