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Theses

Extraction de modèles thermiques simplifiés des machines électriques à partir d’un calcul du champ de températures

Abstract : The temperature rise is one of the main parameters limiting the power of electrical machine. In fact in the stator windings the temperature rise decreases the performances of its insulation system and it can reduce the life time of the motors and it may even lead to the motor failure. Appropriate models of the windings are necessary to find the hot spot of the machine. The work proposed in this thesis focuses on the extraction of simplified thermal models in order to evaluate the temperature distribution. An approach based on a numerical method (Finite Integration Technique) has been developed allowing the identification of the thermal model parameters. As a first step the homogenization of the winding is necessary to obtain the thermal model of the stator slot which has a complex heterogeneous structure requiring careful modeling. The objective is then to replace the conductors and the resin by one homogenous material that reproduces a similar thermal behavior. Several homogenization techniques are used to determine the effective thermal conductivity of the composite material. We are also interested to study different configurations or distributions of the conductors in the slot to limit heat dissipation in the windings of electrical machines. The second part of this thesis presents a method, based on the Finite Integration Technique (FIT) for the discretization that gives us an equivalent thermal model allowing the evaluation of transient temperature evolutions in the slot with low calculation cost.
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Submitted on : Tuesday, January 31, 2012 - 11:53:09 AM
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  • HAL Id : tel-00664666, version 1

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Mohand Laïd Idoughi. Extraction de modèles thermiques simplifiés des machines électriques à partir d’un calcul du champ de températures. Autre [cond-mat.other]. Université Paris Sud - Paris XI, 2011. Français. ⟨NNT : 2011PA112291⟩. ⟨tel-00664666⟩

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