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Adjustable flux three-phase AC machines with combined multiple-step star–delta winding connections / Cistelecan, M.V. in IEEE transactions on energy conversion, Vol. 25 N° 2 (Juin 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25 N° 2 (Juin 2010) . - pp. 348 - 355 Titre : Adjustable flux three-phase AC machines with combined multiple-step star–delta winding connections Type de document : texte imprimé Auteurs : Cistelecan, M.V., Auteur ; Ferreira, F.J.T.E., Auteur ; Popescu, M., Auteur Année de publication : 2010 Article en page(s) : pp. 348 - 355 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : AC  machines;  machine  control;  permanent  magnet  motors;  squirrel  cage  motors;  stators;  synchronous  generators Résumé : In this paper, a complete theory and analysis method for combined star-delta three-phase windings from the point of view of magnetomotive force spatial harmonics content and equivalent winding factors calculation is developed. The method allows for any spatial angle and any coils percentage distribution between star and delta balanced winding systems. It is proven that connecting the inner delta in the clockwise or counterclockwise direction leads to two different space angles between the star and delta systems and two different steps in the flux level control. It means that, compared to what is known and applied up to now, using n winding sections in each phase, it is possible to obtain 2 n steps (instead of n + 1) in the flux level. To check the analysis validity, two experimental tests are reported on both squirrel-cage, integer-winding, induction motor, and permanent magnet, low-speed, fractional-winding, synchronous generator with a specially designed stator winding, allowing multiple-step air-gap flux regulation. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5353678&sortType%3Das [...] [article] Adjustable flux three-phase AC machines with combined multiple-step star–delta winding connections [texte imprimé] / Cistelecan, M.V., Auteur ; Ferreira, F.J.T.E., Auteur ; Popescu, M., Auteur . - 2010 . - pp. 348 - 355. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25 N° 2 (Juin 2010) . - pp. 348 - 355 Mots-clés : AC  machines;  machine  control;  permanent  magnet  motors;  squirrel  cage  motors;  stators;  synchronous  generators Résumé : In this paper, a complete theory and analysis method for combined star-delta three-phase windings from the point of view of magnetomotive force spatial harmonics content and equivalent winding factors calculation is developed. The method allows for any spatial angle and any coils percentage distribution between star and delta balanced winding systems. It is proven that connecting the inner delta in the clockwise or counterclockwise direction leads to two different space angles between the star and delta systems and two different steps in the flux level control. It means that, compared to what is known and applied up to now, using n winding sections in each phase, it is possible to obtain 2 n steps (instead of n + 1) in the flux level. To check the analysis validity, two experimental tests are reported on both squirrel-cage, integer-winding, induction motor, and permanent magnet, low-speed, fractional-winding, synchronous generator with a specially designed stator winding, allowing multiple-step air-gap flux regulation. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5353678&sortType%3Das [...]