Method and system for determining a noise signal and method for compensating for a beat signal

摘要

The invention relates to a method for determining at least one interference signal (Y), which acts on a sensor for detecting a rotation angle of a rotor of an electric machine, by using a Goertzel algorithm, which comprises a first part and a second part. The method comprises at least the steps of detecting an operating signal (Abtr) of the sensor; Calculating a reference signal (Aref) of the sensor; Calculating an error signal (Aerr) as the difference between the operating signal (Abtr) and the reference signal (Aref); Applying the first part of the Goertzel algorithm to calculate a current intermediate result from the error signal (Aerr) and two previous intermediate results; Apply the second part of the Goertzel algorithm to calculate the noise signal (Y) from the current intermediate result and from a previous intermediate result. The invention also relates to a system (10) for detecting at least one interference signal (Y) which acts on a sensor for detecting a rotation angle of a rotor of an electrical machine, by using a Goertzel algorithm comprising a first part and a second part. Furthermore, the invention relates to a method for compensating at least one heterodyne signal, which acts on a sensor for detecting a rotational angle of a rotor of an electric machine.