MODELISATION DU COUPLAGE MAGNETO-THERMIQUE APPLIQUÉE AUX RALENTISSEURS ÉLECTROMAGNÉTIQUES

La conception industrielle de systemes de freinage a courants induits passe par l'analyse des phenomenes mis en jeu lors de leur fonctionnement, et notamment les phenomenes couples magneto-thermiques. Une methode a base d'elements finis a ete developpee, qui consiste a coupler deux codes de calcul, l'un specialise en magnetisme, et l'autre en thermique. La partie electromagnetique du probleme a fait l'objet de developpements specifiques, tels : -la prise en compte de la dependance thermique des caracteristiques B(H) de l'acier, a l'aide d'un modele analytique : -la prise en compte d'ailettes de refroidissement pour le calcul du couple, a l'aide de techniques de pas-a-pas dans le temps avec mouvement, et, beaucoup plus rapides, d'homogeneisation ; -la prise en compte de deformations dues aux contraintes thermo-mecaniques, en utilisant des elements finis transformes plutot qu'un remaillage ; -un mode de calcul 3D des courants induits dus au mouvement, base sur la formulation T-Q., la methode de Petrov-Galerkine, une methode de Newton-Raphson relaxee de facon adaptative, et l'emploi d'elements de raccordement pyramidaux.

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