METHOD AND DEVICE FOR THE SENSORLESS DETERMINATION OF A ROTOR POSITION OF AN ELECTRIC MOTOR

摘要

The invention relates to a method for the sensorless determination of a rotor position (fel) for operating an electronically commutated electric motor (2), comprising the following steps: determining an induced voltage (Uind) in coils of the electric motor (2) from one or more motor currents and motor voltages; and estimating the rotor position (fel) and/or speed information (?el) from a deviation (?Uind) of the inducted voltage (Uind) from an estimated induced voltage (Ûind).