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Theses

CALCUL DES PERFORMANCES D'UNE MACHINE SYNCHRONE A POlES SAillANTS

Abstract : This thesis deals with the analysis of separately-excited synchronous machines (field winding). Mathematical expressions are derived under analytic forms for study and design stages (e.g. pre-calculation of wave shapes and iron losses). The first chapter introduces electric vehicles (E.V.) and drive-train particularities. This part shows the constraints which can affect magnetic values inside E.V. machines. The second chapter develops a calculation method relevant to this context. It allows the analysis of harmonic effects as a result of saliency and machine rotation. This method is based on the study of air-gap permeance (data are obtained once only from a numerical resolution) leading to either punctual or harmonic models of this zone. Complementary information is also given in order to apply the characterisation method to synchronous machines excited with permanent magnets. The next chapters are dedicated to the use and validation of the model forvarious machine operating points. Direct and quadrature-axis inductances are ca1culated for steady-state operation ; the instantaneous flux distribution during rotation is also determined. Cases of high speed with a large . armature reaction field can be investigated as weIl as cases of maximum torque. The analytic-model results have been compared to those obtained with all-numerical computations (finite elements). The model is able to reconstruct the different cases, with excellent accuracy, even for extensive-saturation cases (core non-linearity). These comparisons confirm the validity of the proposed concept.
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Jean-Yves Voyant. CALCUL DES PERFORMANCES D'UNE MACHINE SYNCHRONE A POlES SAillANTS. Sciences de l'ingénieur [physics]. Institut National Polytechnique de Grenoble - INPG, 1997. Français. ⟨tel-00912625⟩

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