METHOD AND DEVICE FOR SENSORLESS ESTIMATION OF THE RELATIVE ANGLE POSITION OF THE ROTOR OF A THREE-PHASE SYNCHRONOUS MOTOR

摘要

A method and a device for sensorless estimation of the relative position () between the stator and the rotor of a three-phase synchronous motor during operation. Comprising the steps of low-pass filtering (1) of the terminal voltage, low-pass filtering (2) of the terminal current, high-pass filtering (3) 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 ( phi ) derived from the rotor speed ( omega ). IMAGE