Multiobjective Shape Design in Electricity and Magnetism
Multiobjective Shape Design in Electricity and Magnetism is entirely focused on electric and magnetic field synthesis, with special emphasis on the optimal shape design of devices when conflicting objectives are to be fulfilled. Direct problems are s
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Lecture Notes in Electrical Engineering Volume 47
For further volumes: http://www.springer.com/series/7818
Paolo Di Barba
Multiobjective Shape Design in Electricity and Magnetism
Paolo Di Barba Ph.D Professor University of Pavia Dept. of Electrical Engineering Via Ferrata, 1 27100 Pavia Italy [email protected]
ISBN 978-90-481-3079-5 e-ISBN 978-90-481-3080-1 DOI 10.1007/978-90-481-3080-1 Springer Dordrecht Heidelberg London New York Library of Congress Control Number: 2009929637 # Springer Science+Business Media B.V. 2010 No part of this work may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, microfilming, recording or otherwise, without written permission from the Publisher, with the exception of any material supplied specifically for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work. Cover design: eStudioCalamar Figueres, Berlin Printed on acid-free paper Springer is part of Springer Science+Business Media (www.springer.com)
To Guia Angelica, my beloved wife
Preface
Electromagnetic devices are crucial to the operation of modern society. They are used to convert energy from mechanical or thermal to an electrical form that may be easily transported over great distances; they can convert electrical energy into mechanical work through the medium of an electric motor; and they can be used to send and receive information around the globe. At this point in time, with issues of energy efficiency and production costs being crucial to the success of a product and becoming more important daily as a growing part of the world’s energy is consumed by electromagnetic systems, designers of these systems need to both understand and have access to effective design techniques and tools. The basic theory underlying the operation of these devices was developed in the nineteenth century and culminated in the work of Maxwell in 1873. The equations he proposed describe the basis of the operation of an electromagnetic system. The main problem has been in the solution of these equations in the presence of the geometries, boundary conditions, excitations and material properties which are found in real devices. Over the past half century, the development of digital computers and the numerical systems needed to compute the field accurately for arbitrary devices has meant that physical prototypes can largely be replaced with computer models and performance results obtained which are, usually, as good as those achieved through experimental systems. However, the reason for performing the analysis often seems to have been forgotten – many times, it appears to be an end in itself. The prediction of performance is just one of the steps that a design engineer needs to execute as part of the process of creating and validating a device intended to meet a set of specifications. In fact, it could be argued that the real work that needs implementing is that related to searching a large space of pos
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