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Impact of MMF space harmonic on rotor losses in fractional-slot permanent-magnet machines / Bianchi, N. in IEEE transactions on energy conversion, Vol. 24 N° 2 (Juin 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 323 - 328 Titre : Impact of MMF space harmonic on rotor losses in fractional-slot permanent-magnet machines Type de document : texte imprimé Auteurs : Bianchi, N., Auteur ; Fornasiero, E., Auteur Année de publication : 2009 Article en page(s) : pp. 323 - 328 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Air  gaps;  losses;  permanent  magnet  machines;  power  system  harmonics;  rotors;  torque Résumé : The fractional-slot permanent-magnet (PM) machines are used in many applications due to their high torque density, low torque ripple, and high efficiency. However, the fractional-slot machines are characterized by high contents of space harmonics in the air-gap MMF distribution. Such harmonics cause flux variation in the air gap, and the main consequence is the induced losses in the rotor. Depending on the combination of slots and poles of the machine, there are different harmonic contents and then rotor losses. By means of a simple model of the rotor losses, this paper investigates the link between the rotor losses and the combination of the slots and the poles of the fractional-slot PM machines. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4757261&sortType%3Das [...] [article] Impact of MMF space harmonic on rotor losses in fractional-slot permanent-magnet machines [texte imprimé] / Bianchi, N., Auteur ; Fornasiero, E., Auteur . - 2009 . - pp. 323 - 328. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 323 - 328 Mots-clés : Air  gaps;  losses;  permanent  magnet  machines;  power  system  harmonics;  rotors;  torque Résumé : The fractional-slot permanent-magnet (PM) machines are used in many applications due to their high torque density, low torque ripple, and high efficiency. However, the fractional-slot machines are characterized by high contents of space harmonics in the air-gap MMF distribution. Such harmonics cause flux variation in the air gap, and the main consequence is the induced losses in the rotor. Depending on the combination of slots and poles of the machine, there are different harmonic contents and then rotor losses. By means of a simple model of the rotor losses, this paper investigates the link between the rotor losses and the combination of the slots and the poles of the fractional-slot PM machines. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4757261&sortType%3Das [...]

Torque harmonic compensation in a synchronous reluctance motor / Bianchi, N. in IEEE transactions on energy conversion, Vol. 23 n°2 (Juin 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°2 (Juin 2008) . - pp. 466 - 473 Titre : Torque harmonic compensation in a synchronous reluctance motor Type de document : texte imprimé Auteurs : Bianchi, N., Auteur ; Bolognani, S., Auteur ; Bon, D., Auteur Année de publication : 2008 Article en page(s) : pp. 466 - 473 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Harmonics  suppression;  reluctance  motors;  torque Résumé : The torque behavior of a synchronous reluctance motor [including the permanent magnet (PM) assisted configuration] is deeply analyzed. An analytical model is developed, showing the dependence of the torque ripple on the rotor geometry. The results of this model allow to individuate the position of the flux--barrier ends so as to minimize the torque ripple. In addition, the proposed strategy to minimize the ripple is not only based on a suitable choice of the flux--barrier ends, but this choice is combined with the adoption of a rotor formed by two different laminations. This strategy allows an optimal compensation of the torque harmonics so that a smooth torque is achieved. Some motor prototypes have been manufactured and tested in a suitable testing bench. The torque versus position characteristics have been measured at very low speed, to avoid a reduction of the high-order torque harmonics. The experimental results confirm the effectiveness of the proposed strategy. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4457820&sortType%3Das [...] [article] Torque harmonic compensation in a synchronous reluctance motor [texte imprimé] / Bianchi, N., Auteur ; Bolognani, S., Auteur ; Bon, D., Auteur . - 2008 . - pp. 466 - 473. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°2 (Juin 2008) . - pp. 466 - 473 Mots-clés : Harmonics  suppression;  reluctance  motors;  torque Résumé : The torque behavior of a synchronous reluctance motor [including the permanent magnet (PM) assisted configuration] is deeply analyzed. An analytical model is developed, showing the dependence of the torque ripple on the rotor geometry. The results of this model allow to individuate the position of the flux--barrier ends so as to minimize the torque ripple. In addition, the proposed strategy to minimize the ripple is not only based on a suitable choice of the flux--barrier ends, but this choice is combined with the adoption of a rotor formed by two different laminations. This strategy allows an optimal compensation of the torque harmonics so that a smooth torque is achieved. Some motor prototypes have been manufactured and tested in a suitable testing bench. The torque versus position characteristics have been measured at very low speed, to avoid a reduction of the high-order torque harmonics. The experimental results confirm the effectiveness of the proposed strategy. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4457820&sortType%3Das [...]