Uncertainty propagation of iron loss from characterization measurements to computation of electrical machines

Abstract

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Uncertainty Propagation of Iron Loss from Characterization Measurements to Computation of Electrical MachinesAbstract-This paper presents the uncertainty propagation of iron losses from the material characterization measurements to the computed losses in an induction machine. The iron losses are modelled with an analytical loss model applied locally in finite element simulation. The uncertainty is taken into account by the decomposition into Polynomial Chaos Expansion, i.e., the spectral approach.The results of the simulations show that uncertainties in the measured losses propagate in different ways and to different parts of the machine depending on the measurement frequency and the nature of losses, i.e., hysteresis, eddy current or excess losses. The computations also show that the measurement uncertainties at low frequencies have negligible effect on the accuracy of computed losses whereas those at the supply frequency and higher ones affect very much this accuracy. It is also shown that the most important loss components are those related to the classical eddy current and alternating hysteresis losses especially in the tooth tips of the stator and rotor. The results suggest that more attention should be paid to the measurement and characterization of these sensitive components.

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