Moteur à Flux Axial à Aimants permanents et à Concentration de Flux : Réalisation, Mesure de Paramètres Statiques et Modèle Numérique 3D - PhDData

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Moteur à Flux Axial à Aimants permanents et à Concentration de Flux : Réalisation, Mesure de Paramètres Statiques et Modèle Numérique 3D

The thesis was published by Mrad, André, in October 2022, Institut National Polytechnique de Toulouse - INPT.

Abstract:

Green energy or sources with zero-carbon emissions plays a leading role in the worldwide electrification. Electric machinery field is a subject of attention leading to the green technology. These machines contribute mainly in the context of industrial applications as electric or hybrid cars. Avoiding the issue and price of rare-earth magnets, potential researches contribute particularly to non-rare-earth machines. For that reasons, this thesis studies the ferrite motor through the ‘Spoke Type Axial Flux Permanent Magnet’ (STAFPM) topology. One from the main interesting properties of this motor is the capability of the no-load magnetic flux concentration in its airgap. The properties of this motor with ferromagnetic poles in the rotor are not so-well known. The present thesis focuses on studying its performances. Achieving this goal, consists firstly by doing a review on the analytical and numerical sizing approaches applied for radial and axial flux machines based on the magnetic field models and as well as, a review on the experimental test benchmark for salient-pole machines which provide us the identification and computation of the electromechanical parameters. Finally, a revision takes place on the 3D magnetic field modeling for sizing purposes. Thus the first section is partially devoted to review the application of the 3D finite difference method for axial machines which is a main objective in this thesis. Afterwards, using a 1D analytical model, a performance comparison takes place between a single stator-single rotor STAFPM motor and a reference Surface Mounted Axial Flux Permanent Magnet (SMAFPM) motor. This comparison is made on the electromagnetic torque and at unified parameters. Consequently, new STAFPM prototype is sized by a consideration of some magnetic constraints. This prototype takes place on a test bench. An original method of the experimental identification of the parameters of the lumped parameter electromechanical model is developed. This method is based on the static torque measurement as a function of the rotor position. A 3D numerical magnetic field model of the STAFPM motor is proposed. This tool studies the no-load magnetic field as well as the armature reaction fields. An original flux calculation method in the framework of the magnetic scalar potential formulation is developed. This method allows the quick calculation of the parameters of the lumped electromechanical model. The calculated parameters are compared to the experimentally identified parameters.



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