Contribution à la modélisation des systèmes statiques à aimants permanents PDF Download

Author: Joël Chavanne (auteur en génie électrique).)
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0

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MODELISATION ELECTROMAGNETIQUE DU COMPORTEMENT DES AIMANTS PERMANENTS EN FONCTION DE LEUR POSITION DANS UN CHAMP EXTERNE.

Author: Gérard Meunier
Publisher: John Wiley & Sons
ISBN: 0470393807
Category : Science
Languages : en
Pages : 618

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Book Description
Written by specialists of modeling in electromagnetism, this book provides a comprehensive review of the finite element method for low frequency applications. Fundamentals of the method as well as new advances in the field are described in detail. Chapters 1 to 4 present general 2D and 3D static and dynamic formulations by the use of scalar and vector unknowns and adapted interpolations for the fields (nodal, edge, face or volume). Chapter 5 is dedicated to the presentation of different macroscopic behavior laws of materials and their implementation in a finite element context: anisotropy and hysteretic properties for magnetic sheets, iron losses, non-linear permanent magnets and superconductors. More specific formulations are then proposed: the modeling of thin regions when finite elements become misfit (Chapter 6), infinite domains by using geometrical transformations (Chapter 7), the coupling of 2D and 3D formulations with circuit equations (Chapter 8), taking into account the movement, particularly in the presence of Eddy currents (Chapter 9) and an original approach for the treatment of geometrical symmetries when the sources are not symmetric (Chapter 10). Chapters 11 to 13 are devoted to coupled problems: magneto-thermal coupling for induction heating, magneto-mechanical coupling by introducing the notion of strong and weak coupling and magneto-hydrodynamical coupling focusing on electromagnetic instabilities in fluid conductors. Chapter 14 presents different meshing methods in the context of electromagnetism (presence of air) and introduces self-adaptive mesh refinement procedures. Optimization techniques are then covered in Chapter 15, with the adaptation of deterministic and probabilistic methods to the numerical finite element environment. Chapter 16 presents a variational approach of electromagnetism, showing how Maxwell equations are derived from thermodynamic principles.

Author: Hervé Roisse
Publisher:
ISBN:
Category :
Languages : fr
Pages : 256

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Book Description
De nos jours, la prediction des performances des machines electriques est tres importante. Dans un premier temps, les concepteurs, dans un soucis d'etre competitif, ne realisent pas de prototype, mais commence leur etude par une modelisation numerique. Ils ont le choix entre une multitude de methodes, mais la plus efficace est la methode des elements finis. Cette derniere est consideree comme la reference pour la precision des resultats en depit d'un temps de calcul prohibitif. Celui-ci devient un handicap lorsque la machine modelisee est de grande taille ou lors d'une simulation en regime dynamique. Dans le but d'assurer un bon compromis entre le temps de calcul et la precision des resultats, nous proposons une methode fondee sur la modelisation par reseaux de permeances couples aux circuits electriques, reposant sur une decomposition du circuit magnetique en un nombre restreint d'elements. Dans le cadre de notre etude, chacun de ces elements peut prendre en compte, soit la saturation des materiaux magnetiques, soit le mouvement du rotor vis a vis du stator ou la modelisation des aimants permanents. Afin de rendre cette methode applicable a un grand nombre de machines, lors de leur utilisation en regime dynamique et pour differents cas de charge, nous avons elabore un couplage magnetique-electrique fort. Les mises en equations des differentes parties et de leur couplage sont realisees par l'intermediaire d'un logiciel de simulation (sirepce) que nous avons developpe. La validation de ce dernier a ete realisee lors de la modelisation d'un alternateur tetrapolaire et d'un alternateur a griffes. De meme, cette methode a ete appliquee plus en details et avec succes, a deux machines synchrones a aimants permanents de forte puissance, nous permettant de concilier a la fois des resultats proches de l'experience et un temps de calcul raisonnable. Enfin une derniere voie d'investigation a ete ouverte pour la prise en compte des courant de foucault dans les aimants.

Author: Xavier Roboam
Publisher: John Wiley & Sons
ISBN: 1118569679
Category : Technology & Engineering
Languages : en
Pages : 290

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Book Description
This book proposes systemic design methodologies applied to electrical energy systems, in particular analysis and system management, modeling and sizing tools. It includes 8 chapters: after an introduction to the systemic approach (history, basics & fundamental issues, index terms) for designing energy systems, this book presents two different graphical formalisms especially dedicated to multidisciplinary devices modeling, synthesis and analysis: Bond Graph and COG/EMR. Other systemic analysis approaches for quality and stability of systems, as well as for safety and robustness analysis tools are also proposed. One chapter is dedicated to energy management and another is focused on Monte Carlo algorithms for electrical systems and networks sizing. The aim of this book is to summarize design methodologies based in particular on a systemic viewpoint, by considering the system as a whole. These methods and tools are proposed by the most important French research laboratories, which have many scientific partnerships with other European and international research institutions. Scientists and engineers in the field of electrical engineering, especially teachers/researchers because of the focus on methodological issues, will find this book extremely useful, as will PhD and Masters students in this field.

Author:
Publisher:
ISBN:
Category : Fluids
Languages : fr
Pages : 720

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Book Description

Author: Sven Boermeester
Publisher:
ISBN: 9781949677072
Category :
Languages : en
Pages :

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Book Description
Innovate Bristol highlights and celebrates those companies and individuals that are actively working at building a better tomorrow for all. Innovation Ecosystems thrive through the involvement and support of companies and individuals from all industries, which is why the Innovate series not only focuses on the innovators but also those people whom the Innovation Ecosystem, would not be able to thrive without.

Author: Hassan Haes Alhelou
Publisher: Springer Nature
ISBN: 3030542750
Category : Technology & Engineering
Languages : en
Pages : 614

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Book Description
This book proposes new control and protection schemes to improve the overall stability and security of future wide-area power systems. It focuses on the high penetration levels of renewable energy sources and distributed generation, particularly with the trend towards smart grids. The control methods discussed can improve the overall stability in normal and abnormal operation conditions, while the protection methods presented can be used to ensure the secure operation of systems under most severe contingencies. Presenting stability, security, and protection methods for power systems in one concise volume, this book takes the reader on a journey from concepts and fundamentals to the latest and future trends in each topic covered, making it an informative and intriguing read for researchers, graduate students, and practitioners alike.

Author: Carolyn Côté-Lussier
Publisher: University of Ottawa Press
ISBN: 0776628720
Category : Social Science
Languages : en
Pages : 396

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Book Description
Contemporary Criminological Issues tackles some of today’s most pressing social issues, from the criminalization of Indigenous peoples to interpersonal violence, border control, and armed conflicts. This book advances cutting-edge theories and methods, with the aim of moving beyond the scholarship that reproduces insecurity and exclusion. The breadth of approaches encompasses much of the current critical criminological scholarship, serving as a counterpoint to the growth of managerial and administrative criminologies and the rise of explicitly exclusionary and punitive state policies and practices with respect to ‘crime’ and ‘security.’ This edited collection featuring two books, one in English and one in French, includes important contributions to knowledge and public policy by eminent experts and emerging scholars. This book is published in English.

Author: Duane C. Hanselman
Publisher:
ISBN: 9781932133639
Category : Electric motors, Brushless
Languages : en
Pages : 0

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Book Description
Explaining techniques for magnetic modelling and circuit analysis, this book shows how magnetic circuit analysis applies to motor design. It describes the major aspects of motor operation and design, and develops design equations for radial flux and axial flux motors. It is intended for electrical, electronics and mechanical engineers.

Author: Ulrich Flogel
Publisher: CRC Press
ISBN: 1315340933
Category : Medical
Languages : en
Pages : 426

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Book Description
Over the past decade, fluorine (19F) magnetic resonance imaging (MRI) has garnered significant scientific interest in the biomedical research community owing to the unique properties of fluorinated materials and the 19F nucleus. Fluorine has an intrinsically sensitive nucleus for MRI. There is negligible endogenous 19F in the body and thus there is no background signal. Fluorine-containing compounds are ideal tracer labels for a wide variety of MRI applications. Moreover, the chemical shift and nuclear relaxation rate can be made responsive to physiology via creative molecular design. This book is an interdisciplinary compendium that details cutting-edge science and medical research in the emerging field of 19F MRI. Edited by Ulrich Flögel and Eric Ahrens, two prominent MRI researchers, this book will appeal to investigators involved in MRI, biomedicine, immunology, pharmacology, probe chemistry, and imaging physics.