Uncertainty Quantification of Input Parameters in a 2-D Finite-Element Model for Broken Rotor Bar in an Induction Machine

Abstract

In this paper, a forward uncertainty propagation method is presented for a 2D finite-element model in an induction machine. This method is applied to quantify the uncertainty of input parameters, e.g., dimensions and material properties, and demonstrate their variability effect on harmonics related to the broken rotor bar faults. To show the most influential input parameters in the case of broken rotor bars harmonics, a global sensitivity analysis is performed from the polynomial chaos expansion approximation of the finite-element model. The results of this study indicate that broken rotor bars harmonics are highly sensitive to stator inner diameter, rotor outer diameter, rotor bar conductivity, and core materials. Moreover, the combined variability of these sensitive input parameters can attenuate the amplitude of the broken rotor bars harmonics 30-90% compared to the simulation results at nominal values of input parameters and closely match with measurement results.