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Etudes des variations de la résistance électrique du contact Balai-Bague de l'alternateur

Abstract : The Alternator is an electrical generator especially designed to supply current to the vehicle electrical components. It is powered by the engine and takes off a part of its power. Currently, car makers are more than willing to minimize the power losses of this device in order to save fuel and reduce CO2 emissions, but the electrical need depend only on the vehicle equipment and use. Sometimes when the alternator runs at full load, the performance could be diminished by unpredictable resistance changes in the electrical sliding contacts of the excitation circuit. There was no theory capable of explaining these phenomena. The analysis limits were the impossibility to measure transfer film thickness and to determine the amount of graphite and the nature and volume of oxides into the film. We developed an experimental method adapted to contact resistance and friction measurements with the aim to find influencing parameters. A dedicated software has been created to extract data from these measurements. We appreciated the relevancy of oxidation hypothesis and we added a study on transfer film, gauging its contribution to contact resistance. Moreover we found a significant correlation between contact resistance and friction, meaning that there are some influent hidden parameters between brush and disc/ring.
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Submitted on : Wednesday, April 2, 2014 - 10:52:59 AM
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  • HAL Id : tel-00969169, version 1


Philippe Chazalon. Etudes des variations de la résistance électrique du contact Balai-Bague de l'alternateur. Autre. Ecole Centrale Paris, 2013. Français. ⟨NNT : 2013ECAP0023⟩. ⟨tel-00969169⟩



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