Signal-Bandwidth Evaluation for Power Measurements in Electric Automotive Drives


The determination of the efficiency of an electric motor or an inverter in an electric vehicle requires power measurements on the ac aspect of the inverter. Voltage and current signals arise there from the switching operation of the inverter and are thus hardly bandlimited. The finite bandwidth of measurement devices, like sensors or ADCs, yields to a bandwidth limitation of the measured signals. This limitation modifies the measured signals and has an impact on the calculated power. Measurement uncertainty concerns require the analysis of the relation between this bandwidth limitation and the ensuing error in the power measurement. This relation permits then for evaluating the significance of the spectral elements for the ability calculation and the decision which parts are relevant and should not be filtered out by a bandwidth limitation. This paper presents an evaluation methodology for determining the bandwidth limitation error and identifies crucial quantities during a numerical study.

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