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Theses

DISCRETION ELECTROMAGNETIQUE DES MACHINES ELECTRIQUES TOURNANTES

Abstract : Every electrical machine produces electromagnetic stray fields. Those fields have low values in term of classical electrotechnics, but in other applications they seem high, like for example in magnetic detection. In this way the aim of this thesis is the reduction of electromagnetic stray fields of electrical machines. An experimental set has been installed. It allows to study, with a great accuracy, the electromagnetic signature of machines and tbe influence of sorne elements as the presence of end shields, and the rotor. The effect of eccentricity has been shown in a purpose of machine safety and maintenance. Numerical models have been developed. The 2D model gives only qualitative results because of its hypothesis : end windings not taken Înto account and infinite length of the machine. The 3D model is able to represent physical phenomena outside the machine. A simple analytical model is also described in this thesis. It is based on the representation by equivalent magnetic dipoles. It helps to understand the signature of the machines. Finally, thanks to those models, solutions for stray fields reduction, as an active shielding, have been considered, after a review of the present usual solutions.
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Gwenaëlle Le Coat. DISCRETION ELECTROMAGNETIQUE DES MACHINES ELECTRIQUES TOURNANTES. Sciences de l'ingénieur [physics]. Institut National Polytechnique de Grenoble - INPG, 1997. Français. ⟨tel-00906722⟩

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