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Détail de l'auteur
Auteur Jahns, Thomas M.
Documents disponibles écrits par cet auteur
Affiner la rechercheAnalysis of negative-saliency permanent-magnet machines / Moncada, Roberto H. in IEEE transactions on industrial electronics, Vol. 57 N° 1 (Janvier 2010)
in IEEE 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 Flux weakening (FW) Inverse saliency Maximum torque per amp (MTPA) Permanent-magnet (PM) machines PM motors Vector control 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 Flux weakening (FW) Inverse saliency Maximum torque per amp (MTPA) Permanent-magnet (PM) machines PM motors Vector control 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
in IEEE transactions on power electronics > Vol. 22 N°1 (Janvier 2007) . - 272-281 p.
Titre : A Current Control Technique for Induction Machine Drives Using Integrated Pilot Current Sensors in the Low-Side Switches Titre original : Une technique courante de commande pour des commandes de machine d'induction à l'aide des sondes courantes pilotes intégrées dans les commutateurs de Bas-Côté Type de document : texte imprimé Auteurs : Chakrabarti, Sibaprasad, Auteur ; Jahns, Thomas M., Auteur ; Lorenz, Robert D, Auteur Article en page(s) : 272-281 p. Note générale : Electronique Langues : Anglais (eng) Mots-clés : Indirect field-oriented control (IFOC) Commande champ-orientée indirecte Index. décimale : 621.31 Production,approvisionnement et contrôle de l'électricité.Machines et appareils électriques.Mesure électrique.Magnétisme et électrostatique appliquées
Résumé : A new current regulation algorithm is presented that achieves indirect field-oriented control (IFOC) for three-phase induction motor drives using current feedback information provided by three integrated pilot sensors in the three low-side inverter switches. A new regulator is required for this configuration of pilot sensors because each sensor can measure its phase current during only half of each fundamental frequency cycle. A technique has been developed to reconstruct the three phase currents during the intervals when they are not measured so that the phase current can be used to achieve FOC of the machine. Experimental results are provided to confirm the attractive performance characteristics of the proposed control technique during both steady-state and transient operation. Key application issues including the impact of errors in the estimated machine parameters are discussed.
On présente un nouvel algorithme de règlement courant qui réalise la commande champ-orientée indirecte (IFOC) pour les commandes triphasées de moteur à induction en utilisant l'information courante de rétroaction fournie par trois sondes pilotes intégrées dans les trois commutateurs d'inverseur de bas-côté. Un nouveau régulateur est exigé pour cette configuration des sondes pilotes parce que chaque sonde peut mesurer son courant de phase pendant seulement la moitié de chaque cycle de fréquence fondamentale. Une technique a été développée pour reconstruire les courants triphasés pendant les intervalles quand ils ne sont pas mesurés de sorte que le courant de phase puisse être employé pour réaliser FOC de la machine. Des résultats expérimentaux sont fournis pour confirmer les caractéristiques d'exécution attrayantes de la technique proposée de commande pendant l'opération équilibrée et passagère. Des questions principales d'application comprenant l'impact des erreurs dans les paramètres estimés de machine sont discutées.DEWEY : 621 ISSN : 0885-8993 RAMEAU : Machines asynchrones En ligne : sibaprasad.chakrabarti@gm.com, jahns@engr.wisc.edu, lorenz@engr.wisc.edu [article] A Current Control Technique for Induction Machine Drives Using Integrated Pilot Current Sensors in the Low-Side Switches = Une technique courante de commande pour des commandes de machine d'induction à l'aide des sondes courantes pilotes intégrées dans les commutateurs de Bas-Côté [texte imprimé] / Chakrabarti, Sibaprasad, Auteur ; Jahns, Thomas M., Auteur ; Lorenz, Robert D, Auteur . - 272-281 p.
Electronique
Langues : Anglais (eng)
in IEEE transactions on power electronics > Vol. 22 N°1 (Janvier 2007) . - 272-281 p.
Mots-clés : Indirect field-oriented control (IFOC) Commande champ-orientée indirecte Index. décimale : 621.31 Production,approvisionnement et contrôle de l'électricité.Machines et appareils électriques.Mesure électrique.Magnétisme et électrostatique appliquées
Résumé : A new current regulation algorithm is presented that achieves indirect field-oriented control (IFOC) for three-phase induction motor drives using current feedback information provided by three integrated pilot sensors in the three low-side inverter switches. A new regulator is required for this configuration of pilot sensors because each sensor can measure its phase current during only half of each fundamental frequency cycle. A technique has been developed to reconstruct the three phase currents during the intervals when they are not measured so that the phase current can be used to achieve FOC of the machine. Experimental results are provided to confirm the attractive performance characteristics of the proposed control technique during both steady-state and transient operation. Key application issues including the impact of errors in the estimated machine parameters are discussed.
On présente un nouvel algorithme de règlement courant qui réalise la commande champ-orientée indirecte (IFOC) pour les commandes triphasées de moteur à induction en utilisant l'information courante de rétroaction fournie par trois sondes pilotes intégrées dans les trois commutateurs d'inverseur de bas-côté. Un nouveau régulateur est exigé pour cette configuration des sondes pilotes parce que chaque sonde peut mesurer son courant de phase pendant seulement la moitié de chaque cycle de fréquence fondamentale. Une technique a été développée pour reconstruire les courants triphasés pendant les intervalles quand ils ne sont pas mesurés de sorte que le courant de phase puisse être employé pour réaliser FOC de la machine. Des résultats expérimentaux sont fournis pour confirmer les caractéristiques d'exécution attrayantes de la technique proposée de commande pendant l'opération équilibrée et passagère. Des questions principales d'application comprenant l'impact des erreurs dans les paramètres estimés de machine sont discutées.DEWEY : 621 ISSN : 0885-8993 RAMEAU : Machines asynchrones En ligne : sibaprasad.chakrabarti@gm.com, jahns@engr.wisc.edu, lorenz@engr.wisc.edu
in IEEE transactions on industrial electronics > Vol. 57 N° 6 (Juin 2010) . - pp. 2054 - 2065
Titre : New control method including state observer of voltage unbalance for grid voltage-source converters Type de document : texte imprimé Auteurs : Lee, Kevin, Auteur ; Jahns, Thomas M., Auteur ; Lipo, Thomas A., Auteur Article en page(s) : pp. 2054 - 2065 Note générale : Génie électrique Langues : Anglais (eng) Mots-clés : Disturbance observer Grid voltage-source converters (VSCs) Power quality Voltage unbalance Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : New observer-based disturbance-estimation and control algorithms are introduced in this paper that compensate source voltage unbalances. The algorithms are also designed to compensate the detrimental impact of delay effects caused by the digital-signal processing. Consequently, these techniques are appropriate for higher power systems with reduced pulsewidth modulation switching frequency and limited current-controller bandwidth. Analytical, simulation, and experimental results are presented to illustrate the effectiveness of the new observer-based control techniques. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5280263 [article] New control method including state observer of voltage unbalance for grid voltage-source converters [texte imprimé] / Lee, Kevin, Auteur ; Jahns, Thomas M., Auteur ; Lipo, Thomas A., Auteur . - pp. 2054 - 2065.
Génie électrique
Langues : Anglais (eng)
in IEEE transactions on industrial electronics > Vol. 57 N° 6 (Juin 2010) . - pp. 2054 - 2065
Mots-clés : Disturbance observer Grid voltage-source converters (VSCs) Power quality Voltage unbalance Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : New observer-based disturbance-estimation and control algorithms are introduced in this paper that compensate source voltage unbalances. The algorithms are also designed to compensate the detrimental impact of delay effects caused by the digital-signal processing. Consequently, these techniques are appropriate for higher power systems with reduced pulsewidth modulation switching frequency and limited current-controller bandwidth. Analytical, simulation, and experimental results are presented to illustrate the effectiveness of the new observer-based control techniques. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5280263
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 [...]
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 [...]
