Patents Assigned to GTI Electroproject B.V.
  • Method and device for controlling an electric load connected to a multiphase switchable DC/AC frequency convertor
    Patent number: 6864660
    Abstract: A method and a device for realizing an effective value of a quantity to be varied in an electrical load connected to a multi-phase switchable DC/AC frequency convertor comprising a plurality of controllable switches. The value is realized by varying a current or a voltage delivered by the DC/AC frequency convertor through suitable switching of the switches thereof, and wherein the quantity exhibits a load angle which, averaged in time, leads or lags the voltage or current being delivered.
    Type: Grant
    Filed: May 13, 2003
    Date of Patent: March 8, 2005
    Assignee: GTI Electroproject B.V.
    Inventor: Andre Veltman
  • Method and a device for sensorless estimating the relative angular position between the stator and rotor of a three-phase synchronous motor
    Patent number: 6552509
    Abstract: A method for sensorless estimation of the relative position between the stator and the rotor of a three-phase synchronous motor during operation. The method comprises the steps of low-pass filtering of the terminal voltage, low-pass filtering of the terminal current, high-pass filtering of the terminal current and determining the rotor speed. Next the relative angular position is determined from the filtered magnitudes and corrected with an angular correction derived from the rotor speed.
    Type: Grant
    Filed: May 10, 2001
    Date of Patent: April 22, 2003
    Assignee: GTI Electroproject B.V.
    Inventor: Andre Veltman