An Optimization Method for Magnetic Field Generator
Résumé
We propose an optimization method to design an elongated three-axes magnetic field generator with given criteria specified over a large volume. The approach is based on the field expansion in Spherical Harmonics and Tchebychev polynomials, for noncircular symmetrical coils arrangement. We developed a specific tool, to get a “flat” or a given "equal-ripple" solution, over a chosen length. The parameters to be defined are: dimensions, coil positions and Amp-turns, associated with the different axes. Once these parameters have been computed, a program predicts the field for the whole structure. A major interest of using such a method lies on the fact that, once the true optimal solution is found, any deviation from theoretical results (for instance building inaccuracy) can be compensated by adjustment of any other design parameters (i.e. current), restoring the initial homogeneity. This method has been successfully applied to the simulator of the Magnetic Metrology Laboratory for Low Field (Laboratoire de Métrologie Magnétique en Champ Faible in French). The experimental results correspond to the theoretical computation.
Domaines
Energie électrique
Origine : Fichiers produits par l'(les) auteur(s)
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