| 摘要 |
The invention relates to a method carried out with simple means for determining the position of the rotor in a sensorless and brushless multi-phase electric motor (1) in addition to a device particularly suitable for carrying out said method. According to said method, a phase voltage (Uv) on the clamping side on said motor phase is to be detected after clamping a first motor phase (V) from the reference potentials (UZ,M) of an intermediate circuit (7) during a detection period (TE), via which the detection period (TE) determines a peak value (Uv*) of the detected phase voltage (Uv), the peak values (Uv*) are to be compared to the comparative value (Uc), and a positon signal (SP) is to be produced when the peak value (Uv*) exceeds the comparative value (U0). The comparative value (Uc) is then determined digitally such that it corresponds to the value of the phase voltage (Uv) at a zero crossing of a voltage (UVind) induced in the first motor phase (V) or an increased or lowered value in relation to a predefined correction value (&Dgr;Q).
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