Fault detection method for a drive assembly

摘要

The method involves measuring several phase currents (I1,I2) of the electric motor (1) at a defined point of the relevant period while simultaneously varying the associated voltages (U1,U2) on the corresponding phases and evaluating the phase current measurement values depending on the voltages on the corresponding phases. A fault in the current converter can be distinguished from an interruption of the current in a phase.