Patents by Inventor Serg Poullain

Serg Poullain 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).

  • Method and a computer for determining the stopped angular position of a rotor, a control unit, and a system incorporating the computer
    Patent number: 6850863
    Abstract: The method of determining the stopped angular position of a rotor comprises the following steps: a) applying a sequence of successive voltage vectors to the terminals of the windings of the stator, said sequence including first and second voltage vectors adapted to modify the electrical characteristics of the windings and a third voltage vector adapted to cancel out the torque created by applying the first and second voltage vectors, b) determining a response signal from all of the windings to application of the first and second voltage vectors, and c) establishing the angular position of the rotor with an uncertainty of ±90° from the signals determined in the step b).
    Type: Grant
    Filed: September 3, 2003
    Date of Patent: February 1, 2005
    Assignee: Alstom
    Inventors: Abdelkrim Benchaib, Jean-Claude Alacoque, Serg Poullain, Jean-Luc Thomas