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Approche Electromagnetique Haute Frequence Des Machines Electriques
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Book Synopsis Approche électromagnétique Haute Fréquence des machines électriques by : Stéphane Duchesne
Download or read book Approche électromagnétique Haute Fréquence des machines électriques written by Stéphane Duchesne and published by . This book was released on 2013 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Résumé : "Ce travail met en avant trois thématiques fortement liées autour de l’amélioration de la qualité de fabrication des machines électriques et de la surveillance de leur vieillissement. Tout d’abord des méthodes d’analyse permettant d’aller chercher les informations les plus pertinentes dans le champ rayonné par une machine mais également sur les mécanismes permettant de relier les champs mesurés à l’extérieur aux grandeurs internes qui sont à leur origine sont présentées. Le circuit magnétique et le Système d’Isolation Electrique ont été étudiés. Les développements relatifs aux circuits magnétiques feuilletés ont mis en évidence l’impact notable des courts-circuits interlaminaires, dus aux bavures de coupe, sur les pertes totales lorsque leur nombre devient important. De nouvelles méthodes ont permis d’estimer la population des courts-circuits et de localiser les plus sévères en vue d’une réparation éventuelle. Lorsque les machines sont alimentées par un variateur de vitesse, la durée de vie des isolants organiques se réduit fortement lorsque les pics de tensions excèdent le seuil d’apparition des décharges partielles qui sont très agressives pour les isolants organiques. Une première méthode propose d’optimiser la conception de la machine pour limiter les contraintes subies par l’isolation inter-spire afin d’augmenter significativement leur durée de vie en travaillant sur les arrangements des spires dans les encoches. Une seconde consiste à utiliser des isolations inorganiques au sein des machines basse tension. Les contraintes de mise en œuvre importantes imposées par ces matériaux imposent de réviser les méthodes classiques de conception des machines. "
Book Synopsis Machines électriques by : Jean Chatelain
Download or read book Machines électriques written by Jean Chatelain and published by EPFL Press. This book was released on 1989-01-01 with total page 689 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce volume consacré aux machines électriques englobe également l'étude du trans- formateur. Si la construction et le dimensionnement des machines électriques restent l'apanage d'un nombre restreint de spécialistes, leur emploi dans de multiples domaines et dans une gamme de puissances étalée de quelques mW à plusieurs centaines de MW touche un large public d'ingénieurs et de techniciens de diverses disciplines. Pour cette raison le Département d'Electricité de l'Ecole polytechnique fédérale de Lausanne conti- nue d'attribuer une large place à l'enseignement de cette matière. Le présent volume, tout en constituant un ouvrage de référence pour l'homme du métier, se veut à vocation essentiellement didactique à l'usage des candidats- ingénieurs en électrotechnique. Si certains développements peuvent apparaître exagérément détaillés, compte tenu de la littérature scientifique existante, leur inclu- sion dans l'ouvrage résulte de l'expérience acquise par l'auteur, confronté pendant 25 ans d'enseignement à des difficultés d'assimilation de la part des étudiants relati- ves à certains phénomènes de base (champ tournant, origine du couple électromagné- tique) ou certaines méthodes de calcul (matrices de transformation, théorie à deux axes, etc.). Le but assigné étant la présentation de la théorie de fonctionnement des machines électriques en régime transitoire ou permanent, les indications sur les maté- riaux et la morphologie ont été réduites au minimum nécessaire à la compréhension de la constitution spécifique de chaque type. De même, les essais n'ont fait l'objet que d'une description succincte. Afin de conserver à l'ouvrage une taille raisonnable, on a renoncé à un traite- ment complet des phénomènes transitoires par la transformation de Laplace ou les méthodes de calcul numérique et retenu seulement, à titre d'application des relations de base, le calcul détaillé des valeurs initiales de courants et de couples de court-circuit. La méthode consistant à négliger, dans un premier temps, l'amortissement est intéres- sante au plan pédagogique par l'entraînement qu'elle procure au bon choix d'hypothèses simplificatrices. La solution exacte tenant compte des amortissements a été fournie sans démonstration, afin de pouvoir définir les différentes constantes de temps (cf. chap. 6,7 et 8). La matière du volume X s'appuie sur les notions générales de l'électrotechnique (vol. I) et de l'électromécanique (vol. IX), sur certaines propriétés des matériaux (vol. II) et sur l'électromagnétisme en régime quasi-statique (vol. III). Elle fait appel égale- ment à des notions développées en électronique de puissance et de réglage (vol. XV et XVI) et en haute tension (vol. XXII).
Book Synopsis Machines électriques non conventionnelles by : EL-HADI Zaim Mohammed, REZZOUG Abderrezak
Download or read book Machines électriques non conventionnelles written by EL-HADI Zaim Mohammed, REZZOUG Abderrezak and published by Lavoisier. This book was released on 2011-04-01 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Étude électromagnétique générale des machines électriques by : Richard Langlois-Berthelot
Download or read book Étude électromagnétique générale des machines électriques written by Richard Langlois-Berthelot and published by . This book was released on 1949 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis La Production des courants à haute fréquence par des machines dynamo-électriques by : Marius Latour
Download or read book La Production des courants à haute fréquence par des machines dynamo-électriques written by Marius Latour and published by . This book was released on 1922 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pénétration des ondes électromagnétiques haute fréquence dans des systèmes by : Isabelle Junqua
Download or read book Pénétration des ondes électromagnétiques haute fréquence dans des systèmes written by Isabelle Junqua and published by . This book was released on 2010 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail de thèse s'intéresse à l'analyse et à l'évaluation de la pénétration des ondes électromagnétiques haute fréquence dans un système complexe surdimensionné, par l'approche dite Power Balance (PWB). La méthode développée dans ces travaux consiste à modéliser les interactions électromagnétiques du problème initial en appliquant les principes de la topologieélectromagnétique et lui adjoignant un formalisme basé sur des considérations énergétiques et macroscopiques de ces interactions. Dans un premier temps, on rappelle les fondements théoriques de la topologie électromagnétique, puis les principes de caractérisation de l'environnement électromagnétique dans une cavité surdimensionnée complexe par un modèle semi-probabiliste dérivé des techniques de chambres réverbérantes. En couplant ces 2 approches et en supposant les mécanismes de dissipation et/ ou de transfert d'énergie dans le système indépendants, on montre que les équations BLT de latopologie électromagnétique permettent de régir les interactions dans le système. Dans un second temps, des modèles PWB élémentaires de sections efficaces de couplage moyenne qui caractérisent ces mécanismes, comme les pertes par effet joule dans les matériaux, les couplages sur câbles ou les transferts par ouvertures, ont été développés et validés par desréférences bibliographiques ou par expérimentations. Finalement, l'approche PWB a été validée sur 3 exemples de systèmes de complexité croissante: une structure générique cylindrique, un équipement avionique et la zone centrale d'un avion rafale. Ainsi, la potentialité de la méthodologie PWB a été démontrée.
Book Synopsis History of Nonlinear Oscillations Theory in France (1880-1940) by : Jean-Marc Ginoux
Download or read book History of Nonlinear Oscillations Theory in France (1880-1940) written by Jean-Marc Ginoux and published by Springer. This book was released on 2017-04-18 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reveals the French scientific contribution to the mathematical theory of nonlinear oscillations and its development. The work offers a critical examination of sources with a focus on the twentieth century, especially the period between the wars. Readers will see that, contrary to what is often written, France's role has been significant. Important contributions were made through both the work of French scholars from within diverse disciplines (mathematicians, physicists, engineers), and through the geographical crossroads that France provided to scientific communication at the time. This study includes an examination of the period before the First World War which is vital to understanding the work of the later period. By examining literature sources such as periodicals on the topic of electricity from that era, the author has unearthed a very important text by Henri Poincaré, dating from 1908. In this work Poincaré applied the concept of limit cycle (which he had introduced in 1882 through his own works) to study the stability of the oscillations of a device for radio engineering. The “discovery” of this text means that the classical perspective of the historiography of this mathematical theory must be modified. Credit was hitherto attributed to the Russian mathematician Andronov, from correspondence dating to 1929. In the newly discovered Poincaré text there appears to be a strong interaction between science and technology or, more precisely, between mathematical analysis and radio engineering. This feature is one of the main components of the process of developing the theory of nonlinear oscillations. Indeed it is a feature of many of the texts referred to in these chapters, as they trace the significant developments to which France contributed. Scholars in the fields of the history of mathematics and the history of science, and anyone with an interest in the philosophical underpinnings of science will find this a particularly engaging account of scientific discovery and scholarly communication from an era full of exciting developments.
Book Synopsis Safety and Reliability 92 by : K.E. Peterson
Download or read book Safety and Reliability 92 written by K.E. Peterson and published by CRC Press. This book was released on 1992-05-01 with total page 1226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Electric Machines by : S. A. Nasar
Download or read book Handbook of Electric Machines written by S. A. Nasar and published by McGraw-Hill Companies. This book was released on 1987 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Physical Control Methods in Plant Protection by : Charles Vincent
Download or read book Physical Control Methods in Plant Protection written by Charles Vincent and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Jointly published with INRA, Paris. Pesticide resistance is becoming more frequent and widespread with more than 500 insect species known to have become resistant to synthetic insecticides. On the other hand, consumers increasingly demand agricultural products without any pesticide residues. This book, for the first time, shows the alternative: solely physical methods for plant protection by means of thermal, electromagnetic, mechanical and vacuum processes. A glossary rounds up this extremely valuable book.
Book Synopsis Quantum Mechanics, Volume 3 by : Claude Cohen-Tannoudji
Download or read book Quantum Mechanics, Volume 3 written by Claude Cohen-Tannoudji and published by John Wiley & Sons. This book was released on 2019-12-16 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.
Download or read book Kompass Belgium written by and published by . This book was released on 1991 with total page 2084 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Induction and Direct Resistance Heating by : Sergio Lupi
Download or read book Induction and Direct Resistance Heating written by Sergio Lupi and published by Springer. This book was released on 2014-12-02 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers broad, detailed coverage of theoretical developments in induction and direct resistance heating and presents new material on the solution of problems in the application of such heating. The physical basis of induction and conduction heating processes is explained and electromagnetic phenomena in direct resistance and induction heating of flat workpieces and cylindrical bodies are examined in depth. The calculation of electrical and energetic characteristics of induction and conduction heating systems is then thoroughly reviewed. The final two chapters consider analytical solutions and numerical modeling of problems in the application of induction and direct resistance heating, providing industrial engineers with the knowledge needed in order to use numerical tools in the modern design of installations. Other engineers, scientists and technologists will find the book to be an invaluable reference that will assist in the efficient utilization of electrical energy.
Download or read book Kompass written by and published by . This book was released on 1997 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dictionary of Building and Civil Engineering by : Don Montague
Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
Book Synopsis Hysteresis in Magnetism by : Giorgio Bertotti
Download or read book Hysteresis in Magnetism written by Giorgio Bertotti and published by Academic Press. This book was released on 1998-05-21 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive treatment of the physics of hysteresis in magnetism and of the mathematical tools used to describe it. Hysteresis in Magnetism discusses from a unified viewpoint the relationsof hysteresis to Maxwells equations, equilibrium and non-equilibrium thermodynamics, non-linear system dynamics, micromagnetics, and domain theory. These aspects are then applied to the interpretation of magnetization reversal mechanisms: coherent rotation and switching in magnetic particles, stochastic domain wall motion and the Barkhausen effect, coercivity mechanisms and magnetic viscosity, rate-dependent hysteresis and eddy-current losses. The book emphasizes the connection between basic physical ideas and phenomenological models of interest to applications, and, in particular, to the conceptual path going from Maxwells equations and thermodynamics to micromagnetics and to Preisach hysteresis modeling. The reader will get insight into the importance and role of hysteresis in magnetism; In particular, he will learn: which are the fingerprints of hysteresis in magnetism which are the situations in which hysteresis may appear how to describe mathematically these situations how to apply these descriptions to magnetic materials how to interpret and predict magnetic hysteresis phenomena observed experimentally
Book Synopsis Hydrogen and Fuel Cells by : International Energy Agency
Download or read book Hydrogen and Fuel Cells written by International Energy Agency and published by Simon and Schuster. This book was released on 2004 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrogen and fuel cells are vital technologies to ensure a secure and CO2-free energy future. Their development will take decades of extensive public and private effort to achieve technology breakthroughs and commercial maturity. Government research programs are indispensable for catalyzing the development process. This report maps the IEA countries' current efforts to research, develop and deploy the interlocking elements that constitute a "hydrogen economy", including CO2 capture and storage when hydrogen is produced out of fossil fuels. It provides an overview of what is being done, and by whom, covering an extensive complexity of national government R & D programs. The survey highlights the potential for exploiting the benefits of the international cooperation. This book draws primarily upon information contributed by IEA governments. In virtually all the IEA countries, important R & D and policy efforts on hydrogen and fuel cells are in place and expanding. Some are fully-integrated, government-funded programs, some are a key element in an overall strategy spread among multiple public and private efforts. The large amount of information provided in this publication reflects the vast array of technologies and logistics required to build the "hydrogen economy."--Publisher description.
