Les applications des électro-aimants sont très nombreuses. Citons les plus importantes : • relais et contacteurs ;. • embrayages et freins ;. • électro-aimants de ...Missing:
/HVpOHFWURDLPDQWV « Il n’y a rien d’incompréhensible » Isidore Ducasse, dit Comte De Lautréamont in « Poésies »
Résumé La création d’une force, dite de Laplace, issue des grandeurs magnétiques permet d’envisager une application essentielle en électromécanique, les électro-aimants. Une série d’hypothèses simplificatrices basées sur celles des circuits magnétiques parfaits permet de déterminer l’expression générale de la force apparaissant lors d’un mouvement de translation. Ce résultat est ensuite étendu au couple. On envisage ensuite le comportement des circuit magnétiques déformables en régime continu pour exprimer la force portante exercée sur l’armature mobile. En régime sinusoïdal, la force portante est la superposition d’une composante constante et d’une autre variable dans le dans. Les inconvénients de ce résultat sont analysés pour élaborer une solution qui assure une force portante la plus constante possible en évitant son annulation pour diminuer les vibrations des électro-aimants en alternatif. Dans une dernière partie, un aperçu général montre les structures technologiques des électro-aimants les plus rencontrés.
Sommaire I. Introduction : définition .......................................................................................... 2 II. Détermination de la force d’attraction (ou du couple) ........................................... 2 II.1. II.2. II.3. II.4. II.5.
Principe....................................................................................................................................2 Hypothèses..............................................................................................................................2 Détermination de l’énergie magnétique (cas de la translation).................................................2 Détermination de l’expression générale de la force.................................................................3 Expression de la force (principe similaire pour le couple)........................................................3
III. Comportement des électro-aimants en régime continu ......................................... 4 III.1. Expression de la force portante...............................................................................................4 III.2. Analyse et conséquences technologiques ...............................................................................4
IV. Comportement des électro-aimants en alternatif (souvent sinusoïdal)................. 4 IV.1. Montage de base.....................................................................................................................4 IV.2. Obtention d’une force constante..............................................................................................5
V. Structures et domaines d’application des électro-aimants.................................... 6 V.1. Généralités...............................................................................................................................6 V.2. Principales structures...............................................................................................................6 V.2.1. V.2.2. V.2.3. V.2.4.
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With the advent of high-quality multichannel consumer music formats, 5.1-channel music producers may benefit from a standardized set of production practices.
With the advent of high-quality multichannel consumer music formats, 5.1-channel music producers may benefit from a standardized set of production practices.
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Dolby Surround. Mixing Manual. Part No. 91536. Issue 2 ... Issue 2. Confidential information for Dolby Laboratories Licensees only. Unauthorized use, sale, or ...
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