Robert Boschgmbh

Johannes Rehagen

Ulrich Vollmer

Wolfgang Krauth

Michael Soellner

David Fricker

Armin Jerger

Ingo Dwertmann

Tankred Mueller

Dominik Denz

Eike Hermann Timm

Thomas Malich

Raphael Fruhauf

A method for operating an electrically commutated machine. In at least one method step, in particular in at least one method step of overmodulation operation of the electrically commutated machine, a precommutation angle of the electrically commutated machine is set depending on an efficiency of the electrically commutated machine.

Method for operating an electrically commutated machine

The invention relates to a method for positional recognition of a rotor of an electronically commutated electric machine, in particular an electric motor, in which a zero crossover of a voltage induced in a coil section of the rotor or stator is used for positional recognition. According to the invention, to determine the zero crossover the coil section is briefly powered down. A rotor/stator is used, comprising at least two coil sections, one of which has a lower inductance relative to the other one, and preferably only the coil section with the lower inductance is used for the positional recognition.

Positional recognition using BEMF zero crossover recognition of a rotor of an electronically commutated electric machine with two coil sections of different inductances

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Karlsruhe, Germany

Johannes Rehagen