Magna Powertrain Gmbh & Co. Kg

Richard Remplbauer

Johannes Winklinger

Markus Kratzer

The invention relates to a method for determining a remaining service life of an electric machine using an insulation measuring device and an electric machine, the insulation measuring device having at least one electric voltage source and the at least one electric voltage source of the insulation measuring device being electrically conductively connected to a phase connection and an earth connection of the electric machine. An object, which is to be able to determine the remaining service life of the electric machine as well as possible, is achieved according to the invention, an electric AC voltage having an amplitude and a frequency being applied in a measuring step between the phase connection and the earth connection using the voltage source, an electric alternating current brought about by the applied electric AC voltage being detected in the phase connection in a subsequent detection step using the insulation measuring device, an impedance between the phase connection and the earth connection being calculated in a subsequent calculation step using the insulation measuring device, and the measuring step, the detection step and the calculation step being repeated with at least one further electric AC voltage having a different amplitude and/or a different frequency, so that a remaining service life of the electric machine can be determined with the aid of the calculated impedances.

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Neuhofen an der Krems, Austria

Richard Remplbauer