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Reducing harmonic eddy-current losses in the stator teeth of interior permanent magnet synchronous machines during flux weakening / Seok-Hee Han 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. 441 - 449 Titre : Reducing harmonic eddy-current losses in the stator teeth of interior permanent magnet synchronous machines during flux weakening Type de document : texte imprimé Auteurs : Seok-Hee Han, Auteur ; Soong, W.L., Auteur ; Jahns, Thomas M., Auteur Année de publication : 2010 Article en page(s) : pp. 441 - 449 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : eddy  current  losses;  finite  element  analysis;  harmonics  suppression;  machine  theory;  permanent  magnet  machines;  synchronous  machines Résumé : Interior permanent magnet (IPM) synchronous machines can experience large harmonic eddy-current losses in the stator teeth under flux-weakening operation, significantly depressing the efficiency of these machines at high operating speeds. This paper presents a new analytical/finite-element hybrid design approach to reduce the harmonic eddy-current losses in IPM machine stator teeth during flux-weakening operation. The proposed technique achieves this objective by three steps: 1) developing an analytical index for the harmonic eddy-current losses in IPM machine stator teeth; 2) designing the spatial distribution of the rotor MMF to minimize the analytical index; and 3) synthesizing the rotor geometry to implement the desired rotor MMF function while maintaining the basic machine characteristics unchanged. It will be shown that two-layer rotors, if properly optimized, are significantly more effective than one-layer rotors for the purpose of reducing the harmonic eddy-current losses in IPM machine stator teeth during flux-weakening operation at high speeds. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5467352&sortType%3Das [...] [article] Reducing harmonic eddy-current losses in the stator teeth of interior permanent magnet synchronous machines during flux weakening [texte imprimé] / Seok-Hee Han, Auteur ; Soong, W.L., Auteur ; Jahns, Thomas M., Auteur . - 2010 . - pp. 441 - 449. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25 N° 2 (Juin 2010) . - pp. 441 - 449 Mots-clés : eddy  current  losses;  finite  element  analysis;  harmonics  suppression;  machine  theory;  permanent  magnet  machines;  synchronous  machines Résumé : Interior permanent magnet (IPM) synchronous machines can experience large harmonic eddy-current losses in the stator teeth under flux-weakening operation, significantly depressing the efficiency of these machines at high operating speeds. This paper presents a new analytical/finite-element hybrid design approach to reduce the harmonic eddy-current losses in IPM machine stator teeth during flux-weakening operation. The proposed technique achieves this objective by three steps: 1) developing an analytical index for the harmonic eddy-current losses in IPM machine stator teeth; 2) designing the spatial distribution of the rotor MMF to minimize the analytical index; and 3) synthesizing the rotor geometry to implement the desired rotor MMF function while maintaining the basic machine characteristics unchanged. It will be shown that two-layer rotors, if properly optimized, are significantly more effective than one-layer rotors for the purpose of reducing the harmonic eddy-current losses in IPM machine stator teeth during flux-weakening operation at high speeds. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5467352&sortType%3Das [...]

Torque ripple reduction in interior permanent magnet synchronous machines using stators with odd number of slots per pole pair / Seok-Hee Han in IEEE transactions on energy conversion, Vol. 25 N° 1 (Mars 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25 N° 1 (Mars 2010) . - pp. 118-127 Titre : Torque ripple reduction in interior permanent magnet synchronous machines using stators with odd number of slots per pole pair Type de document : texte imprimé Auteurs : Seok-Hee Han, Auteur ; Jahns, Thomas M., Auteur ; Soong, W.L., Auteur Année de publication : 2010 Article en page(s) : pp. 118-127 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : permanent  magnet  machines;  rotors;  stators;  synchronous  machines Résumé : This paper develops analytical principles for torque ripple reduction in interior permanent magnet (IPM) synchronous machines. The significance of slot harmonics and the benefits of stators with odd number of slots per pole pair are highlighted. Based on these valuable analytical insights, this paper proposes coordination of the selection of stators with odd number of slots per pole pair and IPM rotors with multiple layers of flux barriers in order to reduce torque ripple. The effectiveness of using stators with odd number of slots per pole pair in reducing torque ripple is validated by applying a finite-element-based Monte Carlo optimization method to four IPM machine topologies, which are combinations of two stator topologies (even or odd number of slots per pole pair) and two IPM rotor topologies (one- or two-layer). It is demonstrated that the torque ripple can be reduced to less than 5% by selecting a stator with an odd number of slots per pole pair and the IPM rotor with optimized barrier configurations, without using stator/rotor skewing or rotor pole shaping. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5401095&sortType%3Das [...] [article] Torque ripple reduction in interior permanent magnet synchronous machines using stators with odd number of slots per pole pair [texte imprimé] / Seok-Hee Han, Auteur ; Jahns, Thomas M., Auteur ; Soong, W.L., Auteur . - 2010 . - pp. 118-127. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25 N° 1 (Mars 2010) . - pp. 118-127 Mots-clés : permanent  magnet  machines;  rotors;  stators;  synchronous  machines Résumé : This paper develops analytical principles for torque ripple reduction in interior permanent magnet (IPM) synchronous machines. The significance of slot harmonics and the benefits of stators with odd number of slots per pole pair are highlighted. Based on these valuable analytical insights, this paper proposes coordination of the selection of stators with odd number of slots per pole pair and IPM rotors with multiple layers of flux barriers in order to reduce torque ripple. The effectiveness of using stators with odd number of slots per pole pair in reducing torque ripple is validated by applying a finite-element-based Monte Carlo optimization method to four IPM machine topologies, which are combinations of two stator topologies (even or odd number of slots per pole pair) and two IPM rotor topologies (one- or two-layer). It is demonstrated that the torque ripple can be reduced to less than 5% by selecting a stator with an odd number of slots per pole pair and the IPM rotor with optimized barrier configurations, without using stator/rotor skewing or rotor pole shaping. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5401095&sortType%3Das [...]