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, Arbre de défaillance La méthode utilisée est composée de trois étapes : l'analyse fonctionnelle, la FFMEA (Functional Failure Mode & Effects Analysis) et l'arbre de défaillance
, Le système étudié est un entrainement avec un onduleur et deux machines électriques. Les frontières du système sont les sources de tension (Bus-DC) qui alimentent le système, Premièrement, la définition des frontières du système étudié est indispensable pour la RIMM et 1 pour les HIMM et Pont-H) au niveau électrique les 2 MSAP à 6 phases. D'autres éléments composent le système : ? Des bras d'onduleur (12 pour les HIMM et RIMM et 24 pour la Pont-H)
, ? Un calculateur
, ? Des capteurs de courant (6 pour les HIMM et RIMM et 12 pour la Pont
, ? 2 capteurs de position
, arbre de défaillance est généré en utilisant les deux étapes précédentes, qui ont déjà été présentées dans la section 2.4.1. L'enchainement des pertes de fonctions respecte la hiérarchie de l'analyse fonctionnelle. Le taux de défaillance des modes de défaut de base sont ceux mentionnés dans la FFMEA, Pour toutes les autres pertes de fonctionnalité, le calcul est fait en sommant ou en multipliant les modes défauts qui génèrent une perte de la fonctionnalité
, Pour la topologie RIMM, il faut perdre le contrôle de deux phases pour que le système s'arrête. Puisque le système à 6 phases, on peut les grouper en 30 combinaisons de deux phases dont le contrôle a été perdu, l'ordre dont les phases tombent en panne est pris en compte. Donc
, Combinaisons de défauts pour perdre le contrôle de deux phases, Figure, vol.177
, Pour les calculer il faut prendre en compte les défauts qui peuvent survenir à une phase auxquels le système est tolérant. Dans cette analyse, la topologie RIMM est la seule topologie qui est tolérante à un défaut de court-circuit de transistor. Pour cela, la partie de l'arbre