Current mode switching for tri-state amplifiers in magnetic...

F - Mech Eng,Light,Heat,Weapons – 16 – C

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F16C 32/04 (2006.01) F16C 39/06 (2006.01) G05D 3/18 (2006.01)

Patent

CA 2202442

Active magnetic bearings are used to suspend shafts of rotating equipment subject to load spectra which vary with respect to time. Control of the position of the rotating assemblies of such equipment is effected by electromechanical systems which combine the use of feedback control to switching amplifiers. The output of these amplifiers must vary of the order of thousands of cycles per second in order to maintain or adjust the desired position for the practical application of such systems in industrial rotating machinery. Furthermore, the application demands that only switching amplifiers be used for reasons of efficiency. The invention comprises a new scheme of switching such amplifiers to result in a more efficient use of power, resulting in less generation of resistance losses which manifests itself as heat. The new switching scheme results in lower operating temperatures which extend the life expectancy and improve the reliability, of magnetic bearing systems.

Des paliers magnétiques actifs servent à soutenir les arbres de machines tournantes soumis à des spectres de charge variables dans le temps. Le réglage de position de ces ensembles tournants est réalisé au moyen de systèmes électro-mécaniques qui combinent la commande à rétroaction et des amplificateurs de commande. La sortie de ces amplificateurs doit varier d'une valeur de l'ordre milliers de cycles par seconde pour maintenir ou régler la position voulue de ces systèmes appliqués à la commande de machinerie industrielle tournante. De plus, l'application considérée impose d'utiliser uniquement la commutation d'amplificateurs de commande pour raisons d'efficacité. Cette invention prévoit un nouveau mode de commutation de ces amplificateurs débouchant sur une exploitation plus efficace de la puissance et une réduction des pertes par effet Joule, source d'échauffement. Partant, ce nouveau mode de commutation entraîne une baisse des températures de fonctionnement, un allongement de la durée utile et une amélioration de la fiabilité des systèmes de supportage magnétiques.

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