Method for determining mechanical rotation angle of rotor based on electrical angle

The invention relates to a method for determining a mechanical rotation angle of a rotor based on an electrical angle, in particular to a method for determining a real-time mechanical rotation angle of a rotor of an electric motor of at least one pole pair. An electrical rotation angle of electrical revolution is detected by using a sensor arrangement during rotation of the rotor; a further measurement signal is detected, wherein the further measurement signal has a phase determined by mechanical rotation of the rotor; a mechanical initial rotation angle of the rotor is determined by means of the further measurement signal; and the real-time mechanical rotation angle of the rotor is calculated by means of the measured electrical rotation angle based on the mechanical initial rotation angle.