Method for sensorless determination of a rotational angle position of a rotor of an electrical machine, electric machine and screw system

摘要

The invention relates to a method for sensorless determination of an angular position of a rotor of an electric machine with rotor and stator, the rotor position angle (φ _r ) being determined by means of a flow model (M) from a rotor flux (Ψ _αβ ), wherein in the flow model (M) is determined on the basis of the current flowing in the stator (I _αβ ), the voltage applied to the stator (U _αβ ), an ohmic resistance (R) of the stator and a leakage inductance (L) of the stator, the rotor flux (Ψ _αβ ), and wherein in Flow model (M) in the determination of the rotor flux (Ψ _αβ ) the voltage applied to the stator (U _αβ ) is corrected with a voltage correction _value (U _{αβ, korr} ), which in the context of a subordinate control taking into account the rotor position angle (φ _r ) and a theoretical value (Ψ _r ) of the rotor flux is determined.