Documents disponibles écrits par cet auteur

Average-value modeling of brushless DC motors with 120° voltage source inverter / Qiang, Han 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. 423 - 432 Titre : Average-value modeling of brushless DC motors with 120° voltage source inverter Type de document : texte imprimé Auteurs : Qiang, Han, Auteur ; Samoylenko, N., Auteur ; Jatskevich, J., Auteur Année de publication : 2008 Article en page(s) : pp. 423 - 432 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Brushless  DC  motors;  commutation;  invertors;  nonlinear  equations;  permanent  magnet  machines;  stators;  switching  convertors;  synchronous  machines Résumé : This paper describes average-value modeling of brushless dc (BLDC) motor-inverter systems, which is challenging due to the complicated switching patterns of the stator currents. A new average-value model (AVM) that appropriately includes commutation and conduction subintervals of the BLDC motor with a 120deg inverter is presented. The proposed model is explicit and uses a proper qd model of the permanent magnet synchronous machine. The required commutation angle is represented as a nonlinear algebraic function, which is readily obtained from the detailed simulation. The studies conducted are based on two typical industrial motors with different electrical time constants, and include hardware measurements, detailed simulation, and comparison with a previously published AVM. The proposed model is shown to be more accurate in terms of both large and small-signal analysis and is applicable to both types of motors. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4505390&sortType%3Das [...] [article] Average-value modeling of brushless DC motors with 120° voltage source inverter [texte imprimé] / Qiang, Han, Auteur ; Samoylenko, N., Auteur ; Jatskevich, J., Auteur . - 2008 . - pp. 423 - 432. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°2 (Juin 2008) . - pp. 423 - 432 Mots-clés : Brushless  DC  motors;  commutation;  invertors;  nonlinear  equations;  permanent  magnet  machines;  stators;  switching  convertors;  synchronous  machines Résumé : This paper describes average-value modeling of brushless dc (BLDC) motor-inverter systems, which is challenging due to the complicated switching patterns of the stator currents. A new average-value model (AVM) that appropriately includes commutation and conduction subintervals of the BLDC motor with a 120deg inverter is presented. The proposed model is explicit and uses a proper qd model of the permanent magnet synchronous machine. The required commutation angle is represented as a nonlinear algebraic function, which is readily obtained from the detailed simulation. The studies conducted are based on two typical industrial motors with different electrical time constants, and include hardware measurements, detailed simulation, and comparison with a previously published AVM. The proposed model is shown to be more accurate in terms of both large and small-signal analysis and is applicable to both types of motors. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4505390&sortType%3Das [...]

Dynamic performance of brushless DC motors with unbalanced hall sensors / Samoylenko, N. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 752 - 763 Titre : Dynamic performance of brushless DC motors with unbalanced hall sensors Type de document : texte imprimé Auteurs : Samoylenko, N., Auteur ; Qiang, Han, Auteur ; Jatskevich, J., Auteur Année de publication : 2008 Article en page(s) : pp. 752 - 763 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Hall  effect  transducers;  brushless  DC  motors;  torque Résumé : Brushless dc (BLDC) motors controlled by Hall-effect sensors are widely used in various applications and have been extensively researched in the literature, mainly under the assumption that the Hall sensors are ideally placed 120 electrical degrees apart. However, this assumption is not always valid; in fact, sensor placement may be significantly inaccurate, especially in medium- and low-precision BLDC machines. This paper shows that misplaced Hall sensors lead to unbalanced operation of the inverter and motor phases, which increases the low-frequency harmonics in torque ripple and degrades the overall drive performance. The paper also presents several average-filtering techniques that can be applied to the original Hall-sensor signals to mitigate the effect of unbalanced placement during steady-state and transient operations. The proposed methodology is demonstrated by modeling and hardware, and is shown to achieve dynamic performance similar to that of a BLDC motor with accurately positioned Hall sensors. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4537158&sortType%3Das [...] [article] Dynamic performance of brushless DC motors with unbalanced hall sensors [texte imprimé] / Samoylenko, N., Auteur ; Qiang, Han, Auteur ; Jatskevich, J., Auteur . - 2008 . - pp. 752 - 763. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 752 - 763 Mots-clés : Hall  effect  transducers;  brushless  DC  motors;  torque Résumé : Brushless dc (BLDC) motors controlled by Hall-effect sensors are widely used in various applications and have been extensively researched in the literature, mainly under the assumption that the Hall sensors are ideally placed 120 electrical degrees apart. However, this assumption is not always valid; in fact, sensor placement may be significantly inaccurate, especially in medium- and low-precision BLDC machines. This paper shows that misplaced Hall sensors lead to unbalanced operation of the inverter and motor phases, which increases the low-frequency harmonics in torque ripple and degrades the overall drive performance. The paper also presents several average-filtering techniques that can be applied to the original Hall-sensor signals to mitigate the effect of unbalanced placement during steady-state and transient operations. The proposed methodology is demonstrated by modeling and hardware, and is shown to achieve dynamic performance similar to that of a BLDC motor with accurately positioned Hall sensors. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4537158&sortType%3Das [...]

Modeling of induction machines using a voltage-behind-reactance formulation / Liwei, Wang 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. 382 - 392 Titre : Modeling of induction machines using a voltage-behind-reactance formulation Type de document : texte imprimé Auteurs : Liwei, Wang, Auteur ; Jatskevich, J., Auteur ; Pekarek, S.D., Auteur Année de publication : 2008 Article en page(s) : pp. 382 - 392 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous  machines;  power  convertors;  power  electronics Résumé : Over the past several years, there has been renewed interest in modeling electrical machines using phase (abc) variables. This paper considers modeling induction machines using phase variables in a voltage-behind-reactance (VBR) formulation. Specifically, three VBR models are proposed wherein the rotor electrical subsystem is modeled using flux linkages as state variables expressed in the qd reference frame. The stator electrical dynamics are represented in abc phase coordinates that enable direct interface of the machine model to an external network. Such a direct interface is advantageous when the machine is fed from a power electronic converter and/or when the modeling is carried out using circuit-based simulators. Computer studies of an induction machine demonstrate that the proposed VBR models achieve a 740% improvement in computational efficiency as compared with the traditional coupled-circuit phase-domain model. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4505399&sortType%3Das [...] [article] Modeling of induction machines using a voltage-behind-reactance formulation [texte imprimé] / Liwei, Wang, Auteur ; Jatskevich, J., Auteur ; Pekarek, S.D., Auteur . - 2008 . - pp. 382 - 392. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°2 (Juin 2008) . - pp. 382 - 392 Mots-clés : Asynchronous  machines;  power  convertors;  power  electronics Résumé : Over the past several years, there has been renewed interest in modeling electrical machines using phase (abc) variables. This paper considers modeling induction machines using phase variables in a voltage-behind-reactance (VBR) formulation. Specifically, three VBR models are proposed wherein the rotor electrical subsystem is modeled using flux linkages as state variables expressed in the qd reference frame. The stator electrical dynamics are represented in abc phase coordinates that enable direct interface of the machine model to an external network. Such a direct interface is advantageous when the machine is fed from a power electronic converter and/or when the modeling is carried out using circuit-based simulators. Computer studies of an induction machine demonstrate that the proposed VBR models achieve a 740% improvement in computational efficiency as compared with the traditional coupled-circuit phase-domain model. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4505399&sortType%3Das [...]

Numerical validation of parametric average-value modeling of synchronous machine–rectifier systems for variable frequency operation / Jatskevich, J. in IEEE transactions on energy conversion, Vol. 23 N°1 (Mars 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 N°1 (Mars 2008) . - pp. 342 - 344 Titre : Numerical validation of parametric average-value modeling of synchronous machine–rectifier systems for variable frequency operation Type de document : texte imprimé Auteurs : Jatskevich, J., Auteur ; Pekarek, S.D., Auteur Année de publication : 2008 Article en page(s) : pp. 342 - 344 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Nonlinear  functions;  rectifiers;  synchronous  machines Résumé : The derivation of accurate dynamic average-value models for synchronous machine-rectifier systems is challenging. A recently proposed parametric approach uses a computer-aided procedure for constructing the required averaged models, wherein the key nonlinear functions are extracted from a detailed (valve-by-valve) simulation. This letter shows that by using a judicious selection of parametric functions, a model obtained at a fixed generator speed is also valid for variable speeds. This is an important feature that makes this approach applicable to systems where electromechanical dynamics and variable speed operation is required. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4453986&sortType%3Das [...] [article] Numerical validation of parametric average-value modeling of synchronous machine–rectifier systems for variable frequency operation [texte imprimé] / Jatskevich, J., Auteur ; Pekarek, S.D., Auteur . - 2008 . - pp. 342 - 344. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 N°1 (Mars 2008) . - pp. 342 - 344 Mots-clés : Nonlinear  functions;  rectifiers;  synchronous  machines Résumé : The derivation of accurate dynamic average-value models for synchronous machine-rectifier systems is challenging. A recently proposed parametric approach uses a computer-aided procedure for constructing the required averaged models, wherein the key nonlinear functions are extracted from a detailed (valve-by-valve) simulation. This letter shows that by using a judicious selection of parametric functions, a model obtained at a fixed generator speed is also valid for variable speeds. This is an important feature that makes this approach applicable to systems where electromechanical dynamics and variable speed operation is required. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4453986&sortType%3Das [...]