{"id":22977,"date":"2026-03-18T14:13:20","date_gmt":"2026-03-18T06:13:20","guid":{"rendered":"https:\/\/www.cndailymag.com\/?p=22977"},"modified":"2026-03-18T14:41:30","modified_gmt":"2026-03-18T06:41:30","slug":"quelles-sont-quelques-structures-de-circuits-magnetiques-courantes","status":"publish","type":"post","link":"https:\/\/www.cndailymag.com\/fr\/quelles-sont-quelques-structures-de-circuits-magnetiques-courantes\/","title":{"rendered":"Quelles sont quelques structures de circuits magn\u00e9tiques courantes\u00a0?"},"content":{"rendered":"

Les applications des aimants permanents au n\u00e9odyme-fer-bore peuvent \u00eatre globalement class\u00e9es en quatre cat\u00e9gories\u00a0: adsorption, r\u00e9pulsion, induction et conversion \u00e9lectromagn\u00e9tique. Le champ magn\u00e9tique requis varie selon l\u2019application.<\/p>\n

\ud83d\udd39 L'espace limit\u00e9 dans les produits 3C, associ\u00e9 \u00e0 la n\u00e9cessit\u00e9 d'une forte adsorption, emp\u00eache d'augmenter significativement la taille des aimants. Par cons\u00e9quent, la conception du circuit magn\u00e9tique est cruciale pour renforcer le champ magn\u00e9tique.<\/p>\n

\ud83d\udd39 Dans les applications n\u00e9cessitant la d\u00e9tection de champs magn\u00e9tiques, des lignes de force magn\u00e9tiques trop diffuses peuvent provoquer des d\u00e9clenchements intempestifs des capteurs \u00e0 effet Hall. La conception du circuit magn\u00e9tique est donc essentielle pour contr\u00f4ler la plage du champ magn\u00e9tique.<\/p>\n

\ud83d\udd39 Dans les situations o\u00f9 une face de l'aimant requiert une forte adsorption tandis que l'autre doit \u00eatre prot\u00e9g\u00e9e du champ magn\u00e9tique, une intensit\u00e9 de champ magn\u00e9tique excessive sur la face de protection peut perturber le fonctionnement des composants \u00e9lectroniques. La conception du circuit magn\u00e9tique doit donc tenir compte de ce probl\u00e8me.<\/p>\n

\ud83d\udd39 Les applications n\u00e9cessitant un positionnement pr\u00e9cis, des champs magn\u00e9tiques uniformes, etc., pr\u00e9sentent \u00e9galement des d\u00e9fis.<\/p>\n

Dans tous ces cas, l'utilisation d'un seul aimant est insuffisante. De plus, le prix \u00e9lev\u00e9 des terres rares influe consid\u00e9rablement sur le co\u00fbt du produit, compte tenu de la taille et du nombre d'aimants n\u00e9cessaires. Par cons\u00e9quent, tout en respectant les exigences d'adsorption ou en assurant un fonctionnement normal, la structure du circuit magn\u00e9tique peut \u00eatre modifi\u00e9e pour s'adapter \u00e0 diff\u00e9rentes applications, tout en r\u00e9duisant le nombre d'aimants utilis\u00e9s afin de diminuer les co\u00fbts.<\/p>\n

Les circuits magn\u00e9tiques courants peuvent \u00eatre class\u00e9s en plusieurs cat\u00e9gories\u00a0: r\u00e9seaux de Halbach, circuits magn\u00e9tiques multipolaires, circuits magn\u00e9tiques focalis\u00e9s, circuits avec ajout de mat\u00e9riaux magn\u00e9tiques, transmission flexible, aimants unilat\u00e9raux et structures de focalisation magn\u00e9tique. Chacune de ces cat\u00e9gories sera pr\u00e9sent\u00e9e en d\u00e9tail ci-dessous\u00a0:<\/p>\n

RAYON HALBACH<\/strong><\/p>\n

Il s'agit d'une structure id\u00e9ale d'un point de vue technique, con\u00e7ue pour g\u00e9n\u00e9rer le champ magn\u00e9tique le plus intense possible avec un nombre minimal d'aimants. Gr\u00e2ce \u00e0 la structure particuli\u00e8re du circuit magn\u00e9tique du r\u00e9seau de Halbach, la majeure partie de la boucle de champ magn\u00e9tique circule \u00e0 l'int\u00e9rieur des dispositifs magn\u00e9tiques, r\u00e9duisant ainsi les fuites de flux et permettant une concentration magn\u00e9tique. Ceci assure un blindage naturel dans les zones non actives. Avec une conception optimis\u00e9e du circuit magn\u00e9tique toro\u00efdal du r\u00e9seau de Halbach, un blindage d'au moins 100% peut \u00eatre obtenu dans ces zones. Comme illustr\u00e9 sur la figure, les lignes de champ magn\u00e9tique d'un circuit magn\u00e9tique conventionnel sont sym\u00e9triquement divergentes, tandis que celles du r\u00e9seau de Halbach sont majoritairement concentr\u00e9es dans la zone active, renfor\u00e7ant ainsi l'attraction magn\u00e9tique.<\/p>\n

\u00c0 gauche : Circuit magn\u00e9tique conventionnel. \u00c0 droite : R\u00e9seau de Halbach.<\/em><\/p>\n

\"\"

 <\/p>\n

Circuits magn\u00e9tiques multipolaires<\/strong><\/p>\n

Les circuits magn\u00e9tiques multipolaires exploitent principalement la propri\u00e9t\u00e9 des lignes de champ magn\u00e9tique de se diriger pr\u00e9f\u00e9rentiellement vers le p\u00f4le oppos\u00e9 le plus proche pour former une boucle magn\u00e9tique. Compar\u00e9es aux aimants monopolaires classiques, les lignes de champ magn\u00e9tique (champ magn\u00e9tique) des circuits multipolaires sont plus concentr\u00e9es en surface, notamment lorsque le nombre de p\u00f4les est plus \u00e9lev\u00e9. Il existe deux types de circuits magn\u00e9tiques multipolaires\u00a0: l\u2019un utilise un aimant unique \u00e0 plusieurs p\u00f4les, et l\u2019autre plusieurs aimants monopolaires adsorb\u00e9s ensemble. La diff\u00e9rence entre ces deux m\u00e9thodes r\u00e9side dans le co\u00fbt\u00a0; leur fonction est identique. Les circuits magn\u00e9tiques multipolaires pr\u00e9sentent un avantage consid\u00e9rable pour l\u2019attraction d\u2019objets situ\u00e9s \u00e0 proximit\u00e9 les uns des autres.<\/p>\n

\"\"

 <\/p>\n

Circuit magn\u00e9tique focalis\u00e9<\/strong><\/p>\n

Un circuit magn\u00e9tique focalis\u00e9 utilise un chemin magn\u00e9tique sp\u00e9cial pour concentrer le champ magn\u00e9tique dans une petite zone, rendant le champ magn\u00e9tique dans cette zone tr\u00e8s puissant, pouvant m\u00eame atteindre 1 T. Ceci est tr\u00e8s utile pour un positionnement pr\u00e9cis et une induction locale.<\/p>\n

\"\"

 <\/p>\n

mat\u00e9riaux magn\u00e9tiques<\/strong><\/p>\n

Les mat\u00e9riaux magn\u00e9tiques exploitent le principe selon lequel les circuits de champ magn\u00e9tique empruntent pr\u00e9f\u00e9rentiellement le chemin de moindre r\u00e9sistance magn\u00e9tique. L'utilisation de mat\u00e9riaux \u00e0 haute perm\u00e9abilit\u00e9 (SUS430, SPCC, DT4, etc.) dans le circuit magn\u00e9tique permet de guider efficacement le champ magn\u00e9tique, assurant ainsi une concentration magn\u00e9tique locale et une isolation magn\u00e9tique.<\/p>\n

\u00c0 gauche : Circuit magn\u00e9tique conventionnel. \u00c0 droite : Circuit magn\u00e9tique apr\u00e8s ajout de mat\u00e9riau magn\u00e9tique.<\/em><\/p>\n

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Circuit magn\u00e9tique apr\u00e8s ajout de mat\u00e9riau magn\u00e9tique 2<\/em>\"\"

 <\/p>\n

Transmission flexible<\/strong><\/p>\n

La transmission flexible se caract\u00e9rise par une transmission sans contact, obtenue gr\u00e2ce aux forces d'attraction et de r\u00e9pulsion g\u00e9n\u00e9r\u00e9es par des aimants. De petite taille et de structure simple, elle offre un couple variable selon le volume de l'aimant et l'entrefer, permettant ainsi une large plage de r\u00e9glage.<\/p>\n

\"\"

 <\/p>\n

Magn\u00e9tisme unilat\u00e9ral<\/strong><\/p>\n

Le magn\u00e9tisme unilat\u00e9ral se caract\u00e9rise par le masquage d'une face de l'aimant, l'autre restant polaris\u00e9e. L'attraction directe est forte, mais la force magn\u00e9tique diminue consid\u00e9rablement avec la distance.<\/p>\n

\"\"

 <\/p>\n

Structure de concentration magn\u00e9tique<\/strong><\/p>\n

Cette structure est compos\u00e9e d'aimants et d'un noyau en fer dispos\u00e9s avec des polarit\u00e9s oppos\u00e9es. Plus le rapport entre l'\u00e9paisseur de l'aimant et celle du noyau est \u00e9lev\u00e9, plus la divergence des lignes de champ magn\u00e9tique est faible. Les structures \u00e0 concentration magn\u00e9tique peuvent \u00eatre con\u00e7ues avec pr\u00e9cision en fonction de l'entrefer afin d'obtenir des r\u00e9sultats optimaux, permettant ainsi de r\u00e9duire le nombre d'aimants et de produire une distribution uniforme du champ magn\u00e9tique le long du noyau. Cependant, cette structure pr\u00e9sente l'inconv\u00e9nient d'un co\u00fbt d'assemblage plus \u00e9lev\u00e9.<\/p>\n

\"\"

 <\/p>\n

Dailymag U<\/strong>Aimants d'ancrage sous-marins<\/strong><\/a> est Circuit magn\u00e9tique focalis\u00e9<\/strong><\/p>\n

\"\"

The applications of neodymium iron boron permanent magnets can be broadly categorized into adsorption, repulsion, induction, and electromagnetic conversion. The required magnetic field varies depending on the specific application. \ud83d\udd39 The limited space in 3C products, coupled with the need for high adsorption strength, prevents significant increases in magnet size. Therefore, magnetic circuit design is…<\/p>","protected":false},"author":15,"featured_media":22978,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-22977","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical"],"acf":[],"yoast_head":"\nWhat are some common magnetic circuit structures? - Dailymag Technology | Magnet, NdFeB Magnet, Magnetic Assembly, Permanent Magnet, Linear Actuator, Sharps Container<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cndailymag.com\/fr\/quelles-sont-quelques-structures-de-circuits-magnetiques-courantes\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What are some common magnetic circuit structures? - Dailymag Technology | Magnet, NdFeB Magnet, Magnetic Assembly, Permanent Magnet, Linear Actuator, Sharps Container\" \/>\n<meta property=\"og:description\" content=\"The applications of neodymium iron boron permanent magnets can be broadly categorized into adsorption, repulsion, induction, and electromagnetic conversion. 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