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149 results on '"Amara, Y."'

3. Résonateur reconfigurable à base de lignes couplées à éléments d'accord intégrés sur substrat silicium

Author

Amara, Y, Allanic, R, Le Berre, D, Quendo, C, Fourn, E, Université de Brest (UBO), Institut d'Electronique et de Télécommunications de Rennes (IETR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), and Region Bretagne et DATERAC

Subjects
[SPI]Engineering Sciences [physics], [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

International audience; This paper presents a particular technique of reconfiguration of coupled line resonators. The reconfigurability is obtained by doping one or more parts of the silicon substrate located at the level of the coupled lines, thus creating one or more distributed diodes. The entire circuit goes through a co-design offering great flexibility and a considerable reduction in losses linked to the interconnection between the passive and active element. A first two-state resonator is presented, it has a resonance frequency close to 2.5 GHz in the OFF state and a frequency of 1.5 GHz in the ON state; the latter being adjustable as a function of the position of the doped zone. A second three-state resonator is also presented, its resonant frequency switches from 2.5 GHz in the OFF state, to 1.62 GHz in the ON1 state then to 2.13 GHz in the ON2 state.; -Ce papier présente une technique particulière de reconfiguration de résonateurs à lignes couplées. La reconfigurabilité est obtenue par le dopage d'une ou plusieurs parties du substrat silicium situées au niveau des lignes couplées, créant ainsi une ou plusieurs diodes distribuées. L'intégralité du circuit passe par une coconception offrant une grande flexibilité et une réduction considérable des pertes liées à l'interconnexion entre l'élément passif et actif. Un premier résonateur deux états est présenté, il possède une fréquence de résonance proche de 2,5 GHz à l'état OFF et une fréquence de 1,5GHz à l'état ON ; cette dernière étant ajustable en fonction de la position de la zone dopée. Un deuxième résonateur trois états est également présenté, sa fréquence de résonance commute de 2,5 GHz à l'état OFF, à 1,62 GHz à l'état ON1 puis à 2,13 GHz à l'état ON2.

Published
2022

8. Hybrid Excited Synchronous Machines

Author

Hlioui, S., primary, Gabsi, M., additional, Ahmed, H. Ben, additional, Barakat, G., additional, Amara, Y., additional, Chabour, F., additional, and Paulides, J. J. H., additional

Published
2022
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32. Armature reaction field and inductances of tubular modular permanent magnet machines.

Author

Wang, J., Howe, D., and Amara, Y.

Abstract

The paper describes an analytical technique which has been developed to predict the armature reaction field of tubular modular permanent magnet (PM) machines in which the fundamental of the stator magnetomotive force (mmf) has fewer poles than that of the permanent magnet armature, the thrust force being developed by the interaction between a higher-order mmf harmonic with the permanent magnet field. The analytical solution also allows the prediction of the self- and mutual-winding inductances of a tubular modular machine in closed forms and facilitates dynamic modeling, as well as the evaluation of any partial irreversible demagnetization of the magnets which might occur under various operating conditions. The utility and accuracy of the developed technique are demonstrated by extensive finite element analyses and measurements on a nine-slot/ten-pole tubular modular PM machine. [ABSTRACT FROM AUTHOR]

Published
2005
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39. Stator iron loss of tubular permanent-magnet machines \ud

Author

Amara, Y., Wang, J.B., and Howe, D.

Abstract

While methods of determining the iron loss in rotating permanent-magnet (PM) machines have been investigated extensively, the study of iron loss in linear machines is relatively poorly documented. This paper describes a simple analytical method to predict flux density waveforms in discrete regions of the laminated stator of a tubular PM machine, and employs an established iron loss model to determine the iron loss components, on both no load and on load. Analytical predictions are compared with the iron loss deduced from finite-element analyses for two tubular PM machine designs, and it is shown that if a machine has a relatively high electrical loading, the on-load iron loss can be significantly higher than the no-load value.

Published
2005

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