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Compatibilité Electromagnétiue

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Cour de Compatibilité Electromagnétique

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April 19, 2021
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2014/2015
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ITI – ENSEA Année 2014 -2015
DUPERRIER


COMPATIBILITE ELECTROMAGNETIQUE (CEM)




NOTIONS DE BASE:
-LE MAGNETISME
-LES CHAMPS ELECTROMAGNETIQUES

,Notions basiques

Qu’est ce qu’un champ ?
À proximité du feu, chacun peut ressentir la chaleur dégagée mais ne la voit
pas. En s'éloignant progressivement du feu, on perçoit de moins en moins la
chaleur. Il s'agit ici d'un champ thermique. C'est exactement la même chose
pour les champs électriques et magnétiques : l'intensité du champ est grande à
proximité de la source et diminue rapidement lorsqu'on s'en écarte.

Champ électrique / Induction magnétique

r r
E B

Pas de courant Courant
(lampe éteinte) (lampe allumée)

CEM-ITI-Année 2014-2015 DUPERRIER 2

, Force de Lorentz

Une particule (q) se déplaçant dans une région où règne un champ électrique (E) et un
champ magnétique (B) est soumis e à une force électromagnétique (Force de Lorentz)

F=q(E+v∧B)




q>0
Cette force a deux composantes :

- Force électrostatique F=qE
- Force magnétique Fm =qv∧B

CEM-ITI-Année 2014-2015 DUPERRIER 3
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