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Détail de l'auteur
Auteur Ferreira, F.J.T.E.
Documents disponibles écrits par cet auteur
Affiner la rechercheAdjustable 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)
[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 [...] Novel multiflux level, three-phase, squirrel-cage induction motor for efficiency and power factor maximization / Ferreira, F.J.T.E. in IEEE transactions on energy conversion, Vol. 23 N°1 (Mars 2008)
[article]
in IEEE transactions on energy conversion > Vol. 23 N°1 (Mars 2008) . - pp. 101 - 109
Titre : Novel multiflux level, three-phase, squirrel-cage induction motor for efficiency and power factor maximization Type de document : texte imprimé Auteurs : Ferreira, F.J.T.E., Auteur ; de Almeida, A.T., Auteur Année de publication : 2008 Article en page(s) : pp. 101 - 109 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Power factor; squirrel cage motors; stators Résumé : In the European Union, the average load factor of electric motors in both industrial and tertiary sectors is estimated to be less than 60%. However, in some industrial sectors, the average load factor for some motor power ranges can be as low as 25%. Most oversized three-phase induction motors operate with low efficiency and power factor, which is, by far, the most important cause for poor power factor in industrial installations. In the low-load operating periods, motor performance can be improved both in terms of efficiency and power factor if the magnetizing flux is properly regulated. In this paper, a multiflux level, three-phase, squirrel-cage induction motor is proposed, in which the efficiency and power factor can be both maximized as a function of load. This novel motor can be a surplus value in industry due to its flexibility, particularly, for variable load applications in which significant energy savings can be obtained, and can also be used as new or rewound general purpose spare motor (with several levels of voltage, magnetizing flux and/or power). The proposed motor has a stator winding with two sets of turns, sharing the same positions in the stator slots (which can be connected either in series or in parallel). Among all the possible stator winding connections, six modes were selected and analyzed (two of which are new). The basic principles for proper connection mode change are discussed. An electronic device and a contactor concept for automatic connection mode change are proposed. As far as the authors know, this concept is described and analyzed for the first time. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4453984&sortType%3Das [...] [article] Novel multiflux level, three-phase, squirrel-cage induction motor for efficiency and power factor maximization [texte imprimé] / Ferreira, F.J.T.E., Auteur ; de Almeida, A.T., Auteur . - 2008 . - pp. 101 - 109.
Energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 23 N°1 (Mars 2008) . - pp. 101 - 109
Mots-clés : Power factor; squirrel cage motors; stators Résumé : In the European Union, the average load factor of electric motors in both industrial and tertiary sectors is estimated to be less than 60%. However, in some industrial sectors, the average load factor for some motor power ranges can be as low as 25%. Most oversized three-phase induction motors operate with low efficiency and power factor, which is, by far, the most important cause for poor power factor in industrial installations. In the low-load operating periods, motor performance can be improved both in terms of efficiency and power factor if the magnetizing flux is properly regulated. In this paper, a multiflux level, three-phase, squirrel-cage induction motor is proposed, in which the efficiency and power factor can be both maximized as a function of load. This novel motor can be a surplus value in industry due to its flexibility, particularly, for variable load applications in which significant energy savings can be obtained, and can also be used as new or rewound general purpose spare motor (with several levels of voltage, magnetizing flux and/or power). The proposed motor has a stator winding with two sets of turns, sharing the same positions in the stator slots (which can be connected either in series or in parallel). Among all the possible stator winding connections, six modes were selected and analyzed (two of which are new). The basic principles for proper connection mode change are discussed. An electronic device and a contactor concept for automatic connection mode change are proposed. As far as the authors know, this concept is described and analyzed for the first time. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4453984&sortType%3Das [...]