Abstract: A method for determining an offset of an angular position encoder is associated with a rotor of an electric machine, wherein a reference offset of a reference angular position encoder of a reference electric machine is known at a reference rotational speed and a reference current with a reference phase angle and a reference absolute value. The method includes the steps of applying a current having the reference absolute value; setting a phase angle of the current to achieve the reference rotational speed; comparing the phase angle with the reference phase angle and the reference offset; and determining the offset on the basis of this comparison.

Abstract: Method for determining a measuring offset of a rotor position sensor (2) assigned to a rotor (3) of an electric machine (5) comprising stator windings that are supplied by an inverter (6) converting a voltage at a DC link capacitor (7) into an AC current, wherein a candidate value for the measuring offset is determined, comprising the following steps: —controlling a power unit (9) of the inverter (6) to provide the current based on rotor position information (19) measured by the rotor position sensor (2) to the stator windings such that the DC link capacitor (7) of the inverter (6) is actively discharged, —evaluating a plausibility of the candidate value for the measuring offset based on a voltage of the DC link capacitor (7) detected while the power unit (9) is controlled to actively discharge the DC link capacitor (7), and —providing the candidate value as determined measuring offset, if a result of the evaluation is positive.

Abstract: Method for determining a measuring offset of a rotor position sensor (2) assigned to a rotor (3) of an electric machine (5) comprising stator windings that are supplied by an inverter (6) converting a voltage at a DC link capacitor (7) into an AC current, wherein a candidate value for the measuring offset is determined, comprising the following steps: —controlling a power unit (9) of the inverter (6) to provide the current based on rotor position information (19) measured by the rotor position sensor (2) to the stator windings such that the DC link capacitor (7) of the inverter (6) is actively discharged, —evaluating a plausibility of the candidate value for the measuring offset based on a voltage of the DC link capacitor (7) detected while the power unit (9) is controlled to actively discharge the DC link capacitor (7), and —providing the candidate value as determined measuring offset, if a result of the evaluation is positive.