Patent ID: 7521925

Claim:
A method for determining the rotor angular position of a rotating electrical machine, which machine has a set of stator windings and a set of rotor windings, in which method the set of stator windings is fed by an associated converter unit, wherein a set of stator windings is short-circuited at at least three predeterminable short-circuiting times by means of the converter unit within one revolution of the rotor given an assumed speed of the rotor, wherein a phase angle of the respective stator current is determined at each short-circuiting time, wherein a differential phase angle is formed from phase angles determined at in each case two temporally adjacent short-circuiting times, wherein a minimum differential phase angle is determined from the differential phase angles, and wherein, in an event of a negative minimum differential phase angle, a correction phase angle is added to a most recently determined phase angle, and, in an event of a positive minimum differential phase angle, the correction phase angle is subtracted from the most recently determined phase angle.