Method and device for detecting the position of the rotor shaft of a permanent-magnet synchronous machine

摘要

The present invention relates to a method and a device for determining position information of the rotor shaft of an electric machine 12, based on a rotational angle assignable sensor signal and at least one input signal 13, 14 of the electric machine 12, wherein the determination is carried out by the following steps: detecting a the Rotation angle assignable sensor signal and the at least one input signal 13, 14 at a time tk; Determining the position information of the rotor shaft at a time tk from the detected sensor signal and the at least one input signal 13, 14; Detecting a sensor signal assignable to the rotation angle and the at least one input signal 13, 14 at a time tk + 1; Determining the position information of the rotor shaft at a time tk + 1 from the detected sensor signal and the at least one input signal 13, 14; wherein the position information of the rotor shaft between the times tk and tk + 1 by means of a Kalman filter 11, 44, based on the detected, the rotation angle assignable sensor signal and the at least one input signal 13, 14, is determined.