Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Wūrzburg

Siemems Ag

Karsten Lohse

Pietro De Filippis

Johannes Schwarzkopf

Eberhard Wünsch

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 () in addition to a device particularly suitable for carrying out said method. According to said method, a phase voltage (U) on the clamping side on said motor phase is to be detected after clamping a first motor phase (V) from the reference potentials (U,M) of an intermediate circuit () during a detection period (T), via which the detection period (T) determines a peak value (U*) of the detected phase voltage (U), the peak values (U*) are to be compared to the comparative value (U), and a positon signal (S) is to be produced when the peak value (U*) exceeds the comparative value (U0). The comparative value (U) is then determined digitally such that it corresponds to the value of the phase voltage (U) at a zero crossing of a voltage (U) induced in the first motor phase (V) or an increased or lowered value in relation to a predefined correction value (&#x394;Q).

Method and device for determining the position of a rotor of a brushless and sensorless electric motor

The invention relates to a circuit arrangement for self-commuting control of a brushless, permanently excited direct current motor. Said circuit arrangement determines the commutation interval by evaluating the induction signal of a signal phase. A capacitive interference suppression component is arranged between the signal phase and an adjacent motor phase in the commutation cycle in order to suppress interferences of the induction signal. The capacitive interference suppression component is dimensioned in such a way that interfering influences of the power-switch element upon the induction signal are compensated for. This makes it possible to more accurately determine the momentary rotating position of the rotor and, hence, a differentiated control or adjustment of performance-influencing manipulated variables during operation. This has positive effects upon the efficiency, the power/weight ration and energy consumption of the motor and enables stable operation.

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Würzburg, Germany

Karsten Lohse