Analysis of negative-saliency permanent-magnet machines / Moncada, Roberto H. in IEEE transactions on industrial electronics, Vol. 57 N° 1 (Janvier 2010)  

Public ISBD [article]  inIEEE transactions on industrial electronics > Vol. 57 N° 1 (Janvier 2010) . - pp. 122 - 127 Titre : Analysis of negative-saliency permanent-magnet machines Type de document : texte imprimé Auteurs : Moncada, Roberto H., Auteur ; Tapia, Juan A., Auteur ; Jahns, Thomas M., Auteur Article en page(s) : pp. 122 - 127 Note générale : Génie électrique Langues : Anglais (eng) Mots-clés : Axial-flux machines Flux control weakening (FW) Inverse saliency Maximum torque per amp (MTPA) Permanent-magnet (PM) PM motors Vector Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : In this paper, a negative-saliency permanent-magnet (PM) synchronous machine analysis is presented. This particular saliency feature is achieved by replacing a portion of the magnet material by a soft iron piece over the rotor pole. In this manner, the d-axis inductance is increased, whereas the q-axis inductance is almost not affected, leading to the condition that Ld is higher than Lq (negative saliency) corresponding to the inverse condition of typical PM machines. An expression for the optimum pole configuration is derived. It is shown that, with appropriate control of the stator current based on the machine's saliency, the unfavorable effects of magnet reduction on torque production can be compensated. It is also shown that the machine saliency affects the location of the operating points when it operates under vector control. Finally, the theoretical analysis is validated with experimental results obtained from a prototype axial-flux PM machine that exhibits negative saliency. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5229193 [article] Analysis of negative-saliency permanent-magnet machines [texte imprimé] / Moncada, Roberto H., Auteur ; Tapia, Juan A., Auteur ; Jahns, Thomas M., Auteur . - pp. 122 - 127. Génie électrique Langues : Anglais (eng) in IEEE transactions on industrial electronics > Vol. 57 N° 1 (Janvier 2010) . - pp. 122 - 127 Mots-clés : Axial-flux machines Flux control weakening (FW) Inverse saliency Maximum torque per amp (MTPA) Permanent-magnet (PM) PM motors Vector Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : In this paper, a negative-saliency permanent-magnet (PM) synchronous machine analysis is presented. This particular saliency feature is achieved by replacing a portion of the magnet material by a soft iron piece over the rotor pole. In this manner, the d-axis inductance is increased, whereas the q-axis inductance is almost not affected, leading to the condition that Ld is higher than Lq (negative saliency) corresponding to the inverse condition of typical PM machines. An expression for the optimum pole configuration is derived. It is shown that, with appropriate control of the stator current based on the machine's saliency, the unfavorable effects of magnet reduction on torque production can be compensated. It is also shown that the machine saliency affects the location of the operating points when it operates under vector control. Finally, the theoretical analysis is validated with experimental results obtained from a prototype axial-flux PM machine that exhibits negative saliency. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5229193

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