Method and device for determining backlash in an electric drive

Abstract

The invention relates to a method for determining backlash in an electric drive (1), wherein the electric drive (1) comprises: an electric machine (10), which has a stator, a rotor (11) and a rotation sensor (12) for sensing the rotational speed of the rotor (11); and a transmission (20), which has an input shaft (21) and an output shaft (22). The method is carried out when the output shaft (22) is not fixed, and has, inter alia, the following steps: - feeding a current that varies over time into the electric machine (10) in order to generate a torque (T) originating from the rotor (11), which torque has at least one zero crossing in the period of time, - detecting a rotational speed signal (v) by means of the rotation sensor (12), and - determining the backlash in the electric drive (1) by evaluating a peak in the rotational speed signal (v).

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