Commande en Mode Dégradé d’un Drive avec Deux Machines 6 phases en Série

Dans le cadre d’une commande en mode dégradé d’un entrainement comprenant deux machines polyphasées connectées en série et pilotées de façon indépendante, l’article s’intéresse à analyser la performance de l’entrainement dans le cas d’un défaut de court-circuit d’un transistor. Deux reconfigurations modifiant l’algorithme de commande ont été présentées avec les objectifs d’éliminer l’ondulation de couple et de comparer la valeur de courant crête obtenue avec chaque stratégie en vue d’obtenir un dimensionnement de l’entrainement au plus juste.Thales Grou

Dual-Multiphase Motor Drives for Fault- Tolerant Applications: Power Electronic Structures and Control Strategies

This paper analyzes two fault-tolerant dualmultiphase motor drives, a series connected topology and a standard H-bridge topology. Previous studies have shown that the series connected topology is appropriate to an aerospace application and has lower peak current in degraded mode in comparison with the H-bridge topology, which may consequently diminish the system’s weight and cost. This paper extends the study to compare different control strategies of these structures under two fault conditions: short-circuit of an inverter’s switch and an open-phase of the machine. The control strategies analyzed in this paper do not impact the fundamental current or the torque generation, but the amplitudes of some harmonics in degraded mode are expected to be narrowed down in order to reduce the inverter’s size. Some analyses of maximum voltage and peak current in degraded mode have been used for inverter dimensioning. Experimental results are shown and compared to the simulated ones to confirm the validity of this study.Thales Avionics Electrical System

Commande en Mode Dégradé d’un Drive avec Deux Machines 6 phases en Série

Dans le cadre d’une commande en mode dégradé d’un entrainement comprenant deux machines polyphasées connectées en série et pilotées de façon indépendante, l’article s’intéresse à analyser la performance de l’entrainement dans le cas d’un défaut de court-circuit d’un transistor. Deux reconfigurations modifiant l’algorithme de commande ont été présentées avec les objectifs d’éliminer l’ondulation de couple et de comparer la valeur de courant crête obtenue avec chaque stratégie en vue d’obtenir un dimensionnement de l’entrainement au plus juste.Thales Grou

New Electrical Inversed-Series Connection for Even-Phase Symmetrical PMSMs

This paper presents an extension of previous methods in order to find electrical series-connections between multiphase machines allowing the independent control of each one of them. These new electrical series-connections explore the symmetrical disposition of the phases of even-multiphase machines, allowing the inversed connection of some of the phases, different from the direct connections as it was previously done. Therefore, electrical series-connections of two symmetrical 6- phase or of four symmetrical 10-phase machines are now possible. Besides that, this new solution ensures a natural independent control of permanent magnet synchronous machines even if the back-electromotive forces generated by the rotor are not sinusoidal, without need of special machine conception or supplementary control strategy. This control independency is mathematically proved using the decomposition of multiphase machines in fictitious diphase and homopolar machines. Experimental results are presented to show the functioning and the advantages of this new coupling for two symmetrical 6-phase permanent magnet synchronous machines.Thèse Cifre - Groupe Thales / Thales Avionics Electrical System

New Electrical Inversed-Series Connection for Even-Phase Symmetrical PMSMs

International audienceThis paper presents an extension of previous methods in order to find electrical series-connections between multiphase machines allowing the independent control of each one of them. These new electrical series-connections explore the symmetrical disposition of the phases of even-multiphase machines, allowing the inversed connection of some of the phases, different from the direct connections as it was previously done. Therefore, electrical series-connections of two symmetrical 6-phase or of four symmetrical 10-phase machines are now possible. Besides that, this new solution ensures a natural independent control of permanent magnet synchronous machines even if the back-electromotive forces generated by the rotor are not sinusoidal, without need of special machine conception or supplementary control strategy. This control independency ismathematically proved using the decomposition of multiphase machines in fictitious diphase and homopolar machines.Experimental results are presented to show the functioning and the advantages of this new coupling for two symmetrical 6-phasepermanent magnet synchronous machines

IEEE

This work is a part of a project CE2I supported by FEDER and by the regional council of Hauts de France Region. It has been also supported by Thales Alenia Space.This paper deals with the fault effects analysis and diagnosis in 6-Φ PMSM designed for aerospace applications. The addressed work aims to analyze the features offered by the space vector theory applied to these systems for fault detection and identification purposes. The paper starts with a presentation of the overall electric drive system structure and its control. Then, fault effects analysis under faulty operation mode of the 6-leg voltage source inverter is presented considering the space vector theory. Based on such analysis, an accurate FDI process is designed for these applications. All results are verified analytically and through simulation software using Matlab/Simulink.Thales Group and Regional Council of Hauts de Franc

IEEE

This work is a part of a project CE2I supported by FEDER and by the regional council of Hauts de France Region. It has been also supported by Thales Alenia Space.This paper deals with the fault effects analysis and diagnosis in 6-Φ PMSM designed for aerospace applications. The addressed work aims to analyze the features offered by the space vector theory applied to these systems for fault detection and identification purposes. The paper starts with a presentation of the overall electric drive system structure and its control. Then, fault effects analysis under faulty operation mode of the 6-leg voltage source inverter is presented considering the space vector theory. Based on such analysis, an accurate FDI process is designed for these applications. All results are verified analytically and through simulation software using Matlab/Simulink.Thales Group and Regional Council of Hauts de Franc