Analysis of a structural failure mode arising in cage rotors of induction machines |
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Authors: | Luigi Beneduce Giovanni Caruso Diego Iannuzzi Franco Maceri Enrico Pagano Luigi Piegari |
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Affiliation: | 1.Ansaldobreda,Naples,Italy;2.Construction Technologies Institute,National Research Council,Rome,Italy;3.University of Naples “Federico II”,Naples,Italy;4.University of Rome “Tor Vergata”,Rome,Italy;5.Polytechnic of Milan,Milan,Italy |
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Abstract: | This study deals with the analysis of a typical failure mode of the induction machines used in high-speed motor drives, consisting
of cracks appearing at the junction between the bars and end-rings of a cage rotor. The cracks are generated by the fatigue
stress due to the end-ring oscillations, excited by tractive torque harmonics. The problem is investigated here by establishing
a simple model of a typical cage rotor, which is validated using experimental results. The model is employed for identifying
the eigenmodes and eigenfrequencies of the rotor and for evaluating the stress arising in the bars during service, either
for an undamaged or a damaged rotor, yielding physical insight on the failure mechanism. A practical and simple design solution
is presented and validated using the proposed model, with the goal of increasing the torsional stiffness of the rotor, thus
reducing the amplitude of the torsional vibrations. As a consequence, the fatigue stress arising at the junction between the
bars and end-rings during service are reduced as well, and the operative life of the rotor is prolonged. |
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