The front cover depicts a behavioural model of an EMI filter in Simulink (inspiration from the painting Victory Boogie-Woogie (1944), Piet Mondriaan).Copyright © 2012 by Anne Roc'h All Rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise without the prior written consent of the copyright owner.
Summary
Behavioural Models of Common Mode EMI filtersEMC is defined as the "ability of an equipment or system to function satisfactorily in its electromagnetic environment without producing intolerable electromagnetic disturbances to anything in that environment". EMC means that equipment shall be designed and manufactured, in such way that:-The electromagnetic disturbance generated does not exceed the level above which radio and telecommunication equipment or other equipment cannot operate as intended.-It has a level of immunity to the electromagnetic disturbance to be expected in its environment which allows it to operate without unacceptable degradation of its indented use.Electric motors convert electrical power into mechanical power within a motor-driven system. Electric motors and the systems they drive are the single largest electrical energy consumer, more than twice as much as lighting, the next largest energy consumer, and represent close to 70% of the electrical energy consumption in the industrial sector worldwide [1]. One of the major problems faced by motor drives is Electromagnetic Interference (EMI) which produces unwanted effects on surrounding electronic devices. A traditional way to control EMI in motor drives is the introduction of EMI filters. However a successful and first-time-right design is a 'done thing' only to a few experienced designers. The filter though is often not optimized in terms of weight, cost and EMI reduction abilities. Enhancing these performance criteria and supporting a first-time-design at the early stages of development, are the objectives of the work presented in this thesis.Behavioural models have been chosen as the modelling technique because they relates the designable parameters of the EMI filter to its final performance placed in the motor drive and respect the underlying physics involved.viThe thesis starts with a description of the generation mechanisms of EMI in motor drives when no precautionary action is taken to reduce them. A focus is made on common mode current as they are the main cause of conducted and radiated electromagnetic emission.Behavioural models of the common mode EMI filter involve the complete motor drive. It has been modelled step by step, starting from a component point of view towards a global approach. It combines functional parameters together with the EMI ones.The constitutive components of the filter are the Y-capacitors and the Common Mode Choke (CMC). A new equivalent circuit of this latter component has been developed. The choice of the proper material is a trade off between cost, size and perfo...