Patents by Inventor Vincent Dionnet

Vincent Dionnet 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 of controlling a rotary electrical machine, a servo-control system for implementing the method, and a rotary machine fitted with such a system
    Patent number: 6198248
    Abstract: A method of controlling the torque of a rotary machine powered by means of an inverter and servo-controlled by a system having sensors, an observer, and a computer which delivers controls to the switches of the inverter on the basis of values supplied to the observer by the sensors, in the form of sequences of three vectors to bring the torque &Ggr; and the stator flux &PHgr;S of the machine towards reference values for &Ggr;ref and &PHgr;Sref. The measurement sampling period is selected to be equal to the sequence period DTML which corresponds to half the switching period of the inverter.
    Type: Grant
    Filed: November 3, 1999
    Date of Patent: March 6, 2001
    Assignee: Alstom Enterprise SA
    Inventors: Jean-Luc Thomas, Vincent Dionnet, Serge Poullain
  • Method of manufacturing a fractal object by using steriolithography and a fractal object obtained by performing such a method
    Patent number: 5355318
    Abstract: The invention relates to methods of enabling fractal objects to be manufactured. In accordance with the invention, the method consists in performing repeated scaling reductions on a parent generator defined by means of three-dimensional coordinates, in storing the coordinates of each daughter object obtained by such a scaling reduction, and in repeating the scaling reduction until the dimensions of a daughter object become less than a given threshold value. The coordinates of the daughter objects are then supplied to stereolithographic apparatus which manufactures the fractal object defined by assembling together the daughter objects.
    Type: Grant
    Filed: June 2, 1993
    Date of Patent: October 11, 1994
    Assignee: Alcatel Alsthom Compagnie Generale d'Electricite
    Inventors: Vincent Dionnet, Frederic Heliodore, Alain R. P. Le Mehaute, Jean Claude Andre