Études théoriques et expérimentales d'accouplements magnétiques supraconducteurs

Abstract : Magnetic couplings (or couplers) are used to transmit torque from a prime mover to its load without mechanical contact. This contactless transmission allows to reduce noise and vibration, to increase reliability and ensure hermetic isolation in severe environments. When the prime mover is a superconducting motor, a coupler which uses superconducting materials has more torque transmission capabilities and enables to transmit torque between a cryogenic media (cryostat) and the ambient temperature. This work focuses on the study of magnetic couplers using high temperature superconductors (HTS) and permanent magnets. Radial and axial field magnetic couplings, for which we developed analytical and numerical design tools, are proposed. A 2D analytical model for calculating the magnetic field distribution in a flux focusing HTS coupling is developed and validated by finite element computations. This model is then embedded in a genetic algorithms optimization procedure. The aim is to find the dimensions of the coupling that maximize torque and minimize the overall length of the HTS wires. A prototype axial field HTS coupler has been also designed, constructed and tested. Several tests have been conducted to characterize the HTS coils. Results of magnetic field, critical current and torque measurements are presented
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Lamia Belguerras. Études théoriques et expérimentales d'accouplements magnétiques supraconducteurs. Autre. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0040⟩. ⟨tel-01750742⟩

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