Contribution à la prise en compte de paramètres incertains dans la modélisation prédictive des impédances de Mode Commun et Différentiel d'une machine électrique à grand nombre de spires

In the context of more electric aircraft, the power density of electrical systems requires a significant improvement. EMC filtering systems, designed at the end of the design process, add significant mass to electrical chains, to comply with electromagnetic interference regulations. This thesis proposes a methodology for predicting the impedance of machine stator coils over a wide frequency range. This methodology, currently used in the state of the art for HF phenomena and the prediction of overvoltages within windings, has been enriched with a mechanical model for the placement of conductors within slots, as well as a thicknessdependent permittivity model for the slot insulating paper. These improvements, coupled with automation, have made possible evaluating the impact of three winding design variables. These results were studied in parallel with experimental measurements, demonstrating that significant variability appears between supposedly similar coils due to assembly contingencies. While the number of conductors has a significant impact on HF impedance, the other variables are largely indistinguishable from these discrepancies. An uncertainty study is therefore proposed, to predictively quantify generated variations by these three design variables. The validations show excellent prediction for CM impedances. DM results demonstrate that a deeper understanding of the exact conductor placement in motor slots is essential for good HF representation.