Academic literature on the topic 'Bobinages des machines électriques'
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Journal articles on the topic "Bobinages des machines électriques"
Tomsin, Philippe. "L’esthétique des machines électriques industrielles." Bulletin d'histoire de l'électricité 35, no. 1 (2000): 67–77. http://dx.doi.org/10.3406/helec.2000.1481.
Full text-BROCHET, Pascal. "Nouvelles tendances en conception de machines électriques." Revue de l'Electricité et de l'Electronique -, no. 10 (2006): 23. http://dx.doi.org/10.3845/ree.2006.094.
Full textKudarauskas, Sigitas. "Les machines oscillatoires et leur place dans l’ensemble des machines électriques." Revue internationale de génie électrique 4, no. 3-4 (December 30, 2001): 391–409. http://dx.doi.org/10.3166/rige.4.391-409.
Full textVan Hoecke, Denis, Sigird Jacobs, Bastien Weber, and Emmanuel Attrazic. "Caractérisation d’aciers électriques pour machines électriques soumises à de hauts niveaux de contrainte mécanique." European Journal of Electrical Engineering 16, no. 2 (April 30, 2013): 243–60. http://dx.doi.org/10.3166/ejee.16.243-260.
Full textFathallah, Mourad, Philippe Foussier, Francis Calmon, Jordi Carrabina, Vincent Grennerat, Xavier Jordà, Jean-Marie Rétif, and Christian Gontrand. "Exemples pratiques d’intégration d’algorithmes de commande pour les machines électriques." Revue internationale de génie électrique 5, no. 1 (March 30, 2002): 105–21. http://dx.doi.org/10.3166/rige.5.105-121.
Full textViarouge, Philippe, Jérôme Cros, and Ilhem Haouara. "Conception des machines électriques avec des matériaux composites fer-résine." Revue internationale de génie électrique 5, no. 2 (June 30, 2002): 299–310. http://dx.doi.org/10.3166/rige.5.299-310.
Full textRoye, D., and R. Perret. "Définitions des règles de modélisation thermique des machines électriques tournantes." Revue de Physique Appliquée 20, no. 3 (1985): 191–202. http://dx.doi.org/10.1051/rphysap:01985002003019100.
Full text-WERYNSKI, Piotr. "Vieillissement des diélectriques et surveillance in situ des machines électriques." Revue de l'Electricité et de l'Electronique -, no. 10 (2006): 37. http://dx.doi.org/10.3845/ree.2006.097.
Full textHubert, Arnaud, and Guy Friedrich. "Comportement vibratoire des machines électriques asynchrones alimentées par convertisseur statique P.W.M." Revue internationale de génie électrique 6, no. 1-2 (April 30, 2003): 225–54. http://dx.doi.org/10.3166/rige.6.225-254.
Full text-Henaux, C. "Enjeu des matériaux magnétiques composites pour les machines électriques du futur." Revue de l'Electricité et de l'Electronique -, no. 08 (2003): 29. http://dx.doi.org/10.3845/ree.2003.093.
Full textDissertations / Theses on the topic "Bobinages des machines électriques"
Marault, Jérôme. "Conception de machines asynchrones triphasées à bobinages statoriques dentaires." Thesis, Lille, 2021. http://www.theses.fr/2021LILUI007.
Full textSquirrel cage induction machines (IM) are reliable, robust and low cost manufacturing electrical machines. For historical and reliability reasons, they are mainly equipped with distributed stator windings. However, even if the latter ensure very satisfactory operation, they have significant end-coils lengths, which generate non-negligible Joule losses. Recently, different fractional slot concentrated windings (FSCW) with reduced end-coils have been used in synchronous machines with interesting performances. In addition to reducing stator Joule losses, these windings enable to design machines that are more compact and fault tolerant. Their use is less common in IM due to the problems induced by spatial harmonics in the magneto motive force when supplied. The aim of this work is to find the best way to use FSCW windings in IM while ensuring good performances. A detailed analysis is first carried out to precisely understand the physical phenomena associated with the use of FSCW in induction machines both in steady state and during start-up. A parametric analytical model of a squirrel cage induction machine was then developed. This model enables to design FSCW windings with a controlled spatial harmonic content but also rotors with different numbers of bars that are equidistant or not. On the basis of this tool, optimizations were carried out both on the stator and its winding and on the rotor structure, showing that it is possible to achieve "uncommon" structures with satisfactory performance. Finally, a fractional slot concentrated winding IM with an innovative rotor cage was developed. Its performance in terms of the developed torque was evaluated through numerical simulations and tests carried out on a prototype
Rouached, Bouali, and Bouali Rouached. "Contribution à la modélisation des défauts de bobinages des machines électriques et à leur détection par des mesures au rotor." Doctoral thesis, Université Laval, 2021. http://hdl.handle.net/20.500.11794/69310.
Full textCe travail de thèse traite de la détection des défauts de bobinages au stator dans les machines électriques contenant une structure d'amortissement. Les courts-circuits entre spires d'un même enroulement sont souvent la prémisse de l'apparition d'autres défauts de bobinages dont les conséquences sont plus sévères. La précocité de détection est donc essentielle pour préserver les machines et leur environnement humain ou matériel. Dans cet ouvrage, nous proposons une solution innovante de discrimination des courts-circuits basée sur la redondance de signaux mesurés au rotor. Pour définir celle-ci, une modélisation d'ordre élevé combinant l'approche des éléments finis et celle des circuits couplés a été employée. La première est utilisée pour déterminer les paramètres (couplages magnétiques) exploités par la seconde qui n'est autre que le modèle comportemental. Comme l'inconvénient de cette combinaison d'approches est le temps utile à l'identification des couplages magnétiques et sachant que diverses configurations de bobinage doivent être modélisées, une nouvelle méthodologie d'identification a été développée. Après une première identification (éléments finis) à temps réduit, celle-ci offre la possibilité d'estimer les paramètres d'une configuration de bobinage souhaitée sans réutilisation de la résolution par éléments finis. En plus de son exploitation pour mettre en œuvre le procédé de détection présenté, cette méthodologie d'identification est un générateur de paramètres utiles pour des détections basées sur « l'estimation paramétrique ». La modélisation des circuits couplés présente un excellent rapport précision/temps de calcul et une bonne efficacité dans la représentation des phénomènes spatiotemporels. L'intégration d'un défaut de bobinage nécessite de faire évoluer les équations de circuits du modèle. À des fins d'atteindre l'objectif de cette thèse, la structure du modèle a été modifiée pour introduire les courts-circuits entre spires au stator. En dehors de l'application présentée, l'association de la méthode d'identification avec le modèle comportemental permet la reproduction rapide de forme d'onde multiple, notamment exploitable dans les approches de détection orientée « signal ». Enfin, à partir de l'outil résultant des travaux précédents, le procédé de diagnostic a pu être déterminé. La sensibilité de détection est le critère principal pour la définition de la technique instrumentale et des traitements de signaux du procédé. L'influence des conditions de fonctionnement sur la sensibilité de détection est évaluée et est considérée pour le choix des solutions retenues. Ce procédé a été validé expérimentalement sur un alternateur synchrone à rotor bobiné de 5.4KVA.
This thesis deals with the detection of stator winding faults in electrical machines containing a damping structure. Short-circuits between turns of the same winding are often the premise for the appearance of other winding faults, the consequences of which are more severe. Early detection is therefore essential to preserve machines and their human or material environment. In this book, we propose an innovative solution to short-circuit discrimination based on the redundancy of signals measured at the rotor. To define this, high-order modelling combining the finite element approach and that of coupled circuits was used. The first is used to determine the parameters (magnetic couplings) exploited by the second which is none other than the behavioural model. As the downside of this combination of approach is the time taken to identify magnetic couplings and the knowledge that various coil configurations must be modelled, a new identification methodology was developed. After an initial identification (finite elements) at short notice, this offers the possibility of estimating the parameters of a desired winding configuration without reusing the finite element resolution. In addition to its use to implement the detection method presented, this identification methodology is a generator of useful parameters for detections based on "parametric estimation". The modelling of coupled circuits presents an excellent precision / calculation time ratio and a good efficiency in the representation of spatial-temporal phenomena. Integrating a winding fault requires changing the model's circuit equations. In order to achieve the objective of this thesis, the structure of the model has been modified to introduce the short circuits between turns at the stator. Apart from the application presented, the association of the identification method with the behavioural model allows the rapid production of multiple waveforms, particularly usable in "signal" oriented detection approaches. Finally, from the tool resulting from the previous work, the diagnostic process could be determined. The detection sensitivity is the main criterion for the definition of the instrumental technique and the signal processing of the process. The influence of the operating conditions on the detection sensitivity is evaluated and is considered for the choice of the solutions adopted. This process has been validated experimentally on a synchronous alternator with wound rotor of 5.4KVA.
This thesis deals with the detection of stator winding faults in electrical machines containing a damping structure. Short-circuits between turns of the same winding are often the premise for the appearance of other winding faults, the consequences of which are more severe. Early detection is therefore essential to preserve machines and their human or material environment. In this book, we propose an innovative solution to short-circuit discrimination based on the redundancy of signals measured at the rotor. To define this, high-order modelling combining the finite element approach and that of coupled circuits was used. The first is used to determine the parameters (magnetic couplings) exploited by the second which is none other than the behavioural model. As the downside of this combination of approach is the time taken to identify magnetic couplings and the knowledge that various coil configurations must be modelled, a new identification methodology was developed. After an initial identification (finite elements) at short notice, this offers the possibility of estimating the parameters of a desired winding configuration without reusing the finite element resolution. In addition to its use to implement the detection method presented, this identification methodology is a generator of useful parameters for detections based on "parametric estimation". The modelling of coupled circuits presents an excellent precision / calculation time ratio and a good efficiency in the representation of spatial-temporal phenomena. Integrating a winding fault requires changing the model's circuit equations. In order to achieve the objective of this thesis, the structure of the model has been modified to introduce the short circuits between turns at the stator. Apart from the application presented, the association of the identification method with the behavioural model allows the rapid production of multiple waveforms, particularly usable in "signal" oriented detection approaches. Finally, from the tool resulting from the previous work, the diagnostic process could be determined. The detection sensitivity is the main criterion for the definition of the instrumental technique and the signal processing of the process. The influence of the operating conditions on the detection sensitivity is evaluated and is considered for the choice of the solutions adopted. This process has been validated experimentally on a synchronous alternator with wound rotor of 5.4KVA.
Rouached, Bouali. "Contribution à la modélisation des défauts de bobinages des machines électriques et à leur détection par des mesures au rotor." Doctoral thesis, Université Laval, 2021. http://hdl.handle.net/20.500.11794/69310.
Full textThis thesis deals with the detection of stator winding faults in electrical machines containing a damping structure. Short-circuits between turns of the same winding are often the premise for the appearance of other winding faults, the consequences of which are more severe. Early detection is therefore essential to preserve machines and their human or material environment. In this book, we propose an innovative solution to short-circuit discrimination based on the redundancy of signals measured at the rotor. To define this, high-order modelling combining the finite element approach and that of coupled circuits was used. The first is used to determine the parameters (magnetic couplings) exploited by the second which is none other than the behavioural model. As the downside of this combination of approach is the time taken to identify magnetic couplings and the knowledge that various coil configurations must be modelled, a new identification methodology was developed. After an initial identification (finite elements) at short notice, this offers the possibility of estimating the parameters of adesired winding configuration without reusing the finite element resolution. In addition to its use to implement the detection method presented, this identification methodology is a generator of useful parameters for detections based on "parametric estimation". The modelling of coupled circuits presents an excellent precision/ calculation time ratio and a good efficiency in the representation of spatial-temporal phenomena. Integrating awinding fault requires changing the model's circuit equations. In order to achieve the objective of this thesis, the structure of the model has been modified to introduce the short circuits between turns at the stator. Apart from the application presented, the association of the identification method with the behavioural model allows therapid production of multiple waveforms, particularly usable in "signal" oriented detection approaches. Finally, from the tool resulting from the previous work, the diagnostic process could be determined. The detection sensitivity is the main criterion for the definition of the instrumental technique and the signal processing of the process. The influence of the operating conditions on the detection sensitivity is evaluated and is considered forthe choice of the solutions adopted. This process has been validated experimentally on a synchronous alternator with wound rotor of 5.4KVA.
Toudji, Mustapha. "Développement de méthodes d'analyse des contraintes sur les isolants inter-spires des bobinages des machines électriques." Thesis, Artois, 2017. http://www.theses.fr/2017ARTO0212.
Full textThe transition to a higher DC voltage network is the most suitable solution to meet with the steady increase in the need/requirement for power flowing in the networks. Today, the control of embedded electric actuators involves the massive use of electronic converters that impose sudden voltage variations. The latter, when applied to an electrical machine windings, generates high electric field levels between the insulators, exceeding sometimes the partial discharge inception voltage (PDIV). Exceeding this threshold leads to the appearance of partial discharges, which are particularly harmful to the turn-to-turn insulation and are responsible for a very rapid deterioration of the electrical insulation system.This physical phenomenon is the main element of the problem on which these research works are based. In this thesis, a numerical tool was developed, which allows prior to the electrical machine design, to predict the electrical stresses applied to the machine's insulation system. This tool should allow the development of new solutions in the various research axes on the aging problem of electric actuators. It involves the development of an RLC lumped element equivalent circuit whose parameters were computed by means of a finite elements analysis considering both the geometry of turns and its location in the coil. Firstly, this tool is used to analyse the electrical stresses applied to the inter-turns insulation of the windings in order to localize the critical zones in the electrical windings. A method based on a simulation of the distribution of the electric field in the windings as a function of time has been developed. The visualization and analysis of electric field maps over a defined time interval allow to determine and to localize the maximum electrical stresses applied to the turn-to-turn insulation. Secondly, to study the aging of the electrical insulation system and to improve the detection methods, a diagnosis assistance tool is proposed. This tool is based on a calculation of the the resonance frequencies’ variations which are most sensitive to the ΔC indicator tested in the laboratory. In order to refine the possibilities of diagnosis, new correlations have been sought, analysed and highlighted
Moeneclaey, Julien. "Méthode de conception des bobinages des actionneurs électriques adaptés aux nouvelles contraintes de l'avionique." Thesis, Artois, 2015. http://www.theses.fr/2015ARTO0201/document.
Full textThe More Electric Aircraft development is reflected by a bigger use of the electrical actuators, which replace the hydraulic or pneumatic system existing or they can also answer to new needs. The energy distribution on board is based on a high voltage continuous bus of 540V connected to electrical power converter. The electric power wide band gap components (SiC, GaN) improve the converters performances but very steep of voltage edge is imposed on the windings of the electric actuators. Each edge excites a transitory regime including an important surge which corresponds to intense electric fields in the inter-turns insulation of coils. When this repetitive electrical constraint exceeds the partial discharges inception voltage (PDIV), the life time of the organic layer between the turns is strongly reduced. The detailed study of the partial discharges (PD) in the area which separate the enamel wire of the windings allows to locate the area where the PD appears. The use of thermo-bonding, with a bonding thickness adapted, allows to raise PDIV beyond the repetitive edge of voltage for the actuators which work in the pressurized parts of the planes. The orderly windings solutions were tested on impregnated cylindrical coils. This analysis shows that the impregnation increases slightly the PDIV from the inter-turns insulation in proportions that do not totally correspond to the intrinsic characteristics of the used varnish. Therefore, the impregnated coils must be conceived on the basis of the primary insulation performance of the enamelled wire. The turn’s arrangement in an orderly coil allows to distribute the constraints and so to conceive the windings which can resist the compulsory repetitive of voltage spikes by the inverter in low pressures corresponding to not pressurized zones in a plane during the flight. A model, based on HF equivalent schema taking in consideration the first two resonances of the elementary coils, allows to analyse the constraints distribution between the coils connected in series of a machine phase
Mihaila, Vasile. "Nouvelle conception des bobinages statoriques des machines à courant alternatif pour réduire les effets négatifs des dV/dt." Thesis, Artois, 2011. http://www.theses.fr/2011ARTO0212/document.
Full textThe emergence of the concept of a more electric aircraft requires a major overhaul of onboard grid. The main developed axis is based on an increase in the grid voltage and a switch to DC bus. In this context, the onboard electric actuators are supplied through power electronic converters that will impose very fast voltage fronts and particular constraints in the windings of the machines. The transient over-voltages that follow the steep-fronted pulses are the source of intense electric fields which may exceed the partial discharge inception voltage (PDIV) and cause a rapid deterioration of polymer based insulators. This thesis focuses on the study of a new design method of the windings in order to reduce problems of partial discharges. An experimental device developed in this framework reproduces the constraints of modern converters and allows measuring the turn-to-turn voltages of a coil. The experimental study shows the phenomena to be considered with this type of power supply and gives an idea of possible areas for optimization. A predictive model able to give the distribution of turn-to-turn voltages, in response to a steep-fronted voltage, helps to identify critical points. The constitutive parameters of this model were determined using analytical, experimental and numerical methods. Given the complexity of the model, an automated numerical tool has been developed in order to simulate the model of studied coils. Several types of coil have been analyzed and optimized successfully. This optimization consists in reducing the turn-to-turn voltages by acting on the arrangement of the wires in the slots. The use of optimized coils with this method allows envisaging a significantimprovement in the reliability of electrical machines
Benmamas, Loucif. "Méthodes d’évaluation du risque de décharges partielles dans le bobinage de machines électriques destinées à la traction automobile." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS451/document.
Full textElectrical machine used in variable speed drives are usually fed by a converter using fast switching power electronics devices. Thus, each stator winding of the machine is subjected to steep-fronted voltage pulses whose distribution over its various turns depends on the parasitic capacitances between turns or between turns and slot walls. Therefore, local areas of high electric field appear within the coil, often resulting in partial discharges activity. This thesis aims to provide accurate and quantified information regarding partial discharge inception when various parameters related to the machine power supply and winding topology so as to help develop expertise with respect to problems related to partial discharges, as well as to deduce machine design rules in this regard
Al, Eit Moustafa. "Application de la réduction du modèle dans les analyses par éléments finis pour l’optimisation du bobinage des machines électriques." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS579/document.
Full textThe switched reluctance machine can be used in hybrid or electric vehicle where, for autonomy considerations, energy efficiency is crucial. Because of the strong stray field in the air-gap region of the switched reluctance machine due to its salient pole geometry, the copper losses can become substantial. It is firmly recommended therefore not to place the coil conductors near the air-gap region. Nevertheless, concrete instructions for optimal winding design are missing. The copper losses in electrical machines are subdivided into classical DC ohmic losses and additional eddy current losses occurring due to the time varying magnetic fields penetrating the copper conductors. Based on the fact that the DC losses are constant at a given operating point, the optimization is focused on reducing the eddy current losses by modifying the winding geometry configuration. In the case of tedious repetitive calculations, met for example during design and optimization processes of electrical machine windings, there is a significant interest in reducing the computation time. This work suggests three model reduction techniques and their applications in the finite element analyses.Besides the frequency of the excitation current and the cross section of the coil conductors, several factors related to the winding configuration can affect the addition al eddy current losses:i) the coil conductor position in the winding slot especially near the stator pole or close to the air gapii) the disposition of the coil conductor against the two-dimensional flux lines in the slot windingiii) the subdivision of the solid conductor into multiple parallel strands swapping their positions periodically in the conductor cross section throughout the length of the machine winding.This thesis mainly studies the influence of the geometric coils disposition in the slot windings and the type of the conductor used whether it is solid or stranded, with Litz or twisted wires.The eddy current losses exit through the strong electro-magnetic coupling between the electric current density and the time dependent magnetic flux lines penetrating the conductors; it is described mathematically by a partial differential equation that cannot be solved easily. The analytical approach, which is used practically for a quick resolution of the strong electro-magnetic coupling equation, is only possible under certain simplifying assumptions that deteriorate brutally the reliability of the copper losses calculation. The finite element modeling as for it, allows taking into account the rotor motion and the non-linear behavior of the magnetic circuit, thus ensuring a higher accuracy. However, it leads under these conditions to a substantial calculation time and requires large storage capacity. These constraints are critical and may hinder therefore any process of conception or optimization. In this thesis, we suggest three different model reduction techniques that can be effective in reducing the size of large scale complete finite element models and enable therefore to shorten the computational time:i) the spatial reduction avoiding the 3D modeling which seems required in the case of twisted and Litz wires and suggesting an alternative satisfactory 2D modeling.ii) the perturbation technique.iii) the model order reduction using the proper orthogonal decomposition combined with the discrete empirical interpolation method.The comparison between the reduced model solutions to that of the complete finite element model has proved the effectiveness of the proposed model reduction techniques; they allow shrinking the required computational time while staying below an acceptable error of accuracy
Savin, Serghei. "Nouvel indicateur de vieillissement de l'isolation inter-spires des machines électriques utilisées en aéronautique." Thesis, Artois, 2013. http://www.theses.fr/2013ARTO0201/document.
Full textFor modern aircrafts, the onboard electrical grid becomes the main energy transmission system apart from energy reserved for propulsion. Electrical systems are gradually replacing hydraulic and air systems providing respectively flight controls and cabin comfort in current aircrafts. To transmit higher electrical power without increasing the conductors’ masses, a new standard has been set, the grid of more electrical aircrafts will be 540 VDC. As a result, static converters will systematically be used to drive the electrical actuators. Substantially higher electrical constraints will be applied to electrical machine windings, in addition to those inherent in aeronautics. To obtain the required operational safety, the monitoring of the insulation for onboard electrical embedded machines has become indispensable. This thesis work is focused on the definition of a new aging indicator for the electrical insulation of machine used in aeronautics. The new delta-C indicator is based on the correlation between the increase in the turn-to-turn winding capacitance and reduction of performance mainly characterized by the decrease of Partial Discharge Inception Voltage (PDIV). The experimental part of this work is considerable; the thesis gives the results of accelerated aging tests on a large number of enameled wire standard samples. These results make it possible to define critical threshold for the new delta-C indicator depending on the mission profile of the actuator. The new delta-C indicator is correlated with an easily measurable parameter on an operating electrical machine, i.e. the resonance frequencies of the winding. A numerical tool was developed to determine the resonance frequencies to be monitored according to the geometry and the technology of the winding machine. The prediction frequencies determined by the developed numerical tool have been verified by measurements on artificially aged coils. The study has been extended to the influence of the supply cable of the electrical machine. The operating limits of the proposed monitoring system are defined for various distances between the electrical machine and the connection point of the measurement systems
Jarrot, Damien. "Contribution au développement d'outils de conception de machines synchrones à aimants permanents en vue de l'intégration convertisseur-machine : étude des machines électriques double étoile à coupleur magnétique intégré pour une application aéronautique." Phd thesis, Toulouse, INPT, 2016. http://oatao.univ-toulouse.fr/17868/1/Jarrot_Damien.pdf.
Full textBooks on the topic "Bobinages des machines électriques"
Chatelain, Jean. Machines électriques. 2nd ed. Lausanne: Presses Polytechniques Romandes, 1989.
Find full textLasne, Luc. Exercices et problèmes d'électrotechnique: Notions de base, réseaux et machines électriques. 2nd ed. Paris: Dunod, 2011.
Find full textEl-Hawary, M. E. Principles of electric machines with power electronic applications. 2nd ed. Piscataway, NJ: IEEE Press, 2002.
Find full textElectrical machines, drives, and power systems. 3rd ed. Englewood Cliffs, NJ: Prentice Hall International, 1997.
Find full textWildi, Theodore. Electrical machines, drives, and power systems. 2nd ed. Englewood Cliffs, N.J: Prentice Hall, 1991.
Find full textElectrical machines, drives, and power systems. 3rd ed. Upper Saddle River, N.J: Prentice Hall, 1997.
Find full textWildi, Théodore. Électrotechnique. 4th ed. Sainte-Foy, Qué: Presses de l'Université Laval, 2005.
Find full textGwyther, H. F. G. Solving problems in electrical power and power electronics. Harlow, Essex, England: Longman Scientific & Technical, 1988.
Find full textChiasson, John Nelson. Modeling and High Performance Control of Electric Machines. New York: John Wiley & Sons, Ltd., 2005.
Find full textModeling and high performance control of electric machines. Hoboken, NJ: John Wiley, 2005.
Find full textBook chapters on the topic "Bobinages des machines électriques"
"Considérations générales sur l’asservissement des machines électriques." In Entraînements à courant continu, 1–6. Presses de l'Université du Québec, 1986. http://dx.doi.org/10.2307/j.ctv18pgv8c.5.
Full textEdelman, Nicole. "Des machines à guérir : le baquet de Mesmer et les premières machines électriques (fin XVIIIe-fin XIXe siècle)." In Corps et machines à l'âge industriel, 25–40. Presses universitaires de Rennes, 2011. http://dx.doi.org/10.4000/books.pur.109272.
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