{"id":76791,"date":"2020-04-04T19:42:31","date_gmt":"2020-04-04T17:42:31","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/amerikanczy-predlozhili-sobirat-energiyu-dlya-interneta-veshhej-iz-magnitnyh-polej-blizhajshej-elektroprovodki"},"modified":"2020-04-04T19:42:31","modified_gmt":"2020-04-04T17:42:31","slug":"amerikanczy-predlozhili-sobirat-energiyu-dlya-interneta-veshhej-iz-magnitnyh-polej-blizhajshej-elektroprovodki","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/amerikanczy-predlozhili-sobirat-energiyu-dlya-interneta-veshhej-iz-magnitnyh-polej-blizhajshej-elektroprovodki","title":{"rendered":"Des chercheurs am\u00e9ricains proposent de r\u00e9colter de l'\u00e9nergie pour l'Internet des objets \u00e0 partir de champs magn\u00e9tiques des lignes \u00e9lectriques les plus proches","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Le th\u00e8me de la g\u00e9n\u00e9ration d'\u00e9lectricit\u00e9 \u00e0 partir de l'\u00ab air \u00bb \u2013 du bruit \u00e9lectromagn\u00e9tique, des vibrations, de la lumi\u00e8re, de l'humidit\u00e9 et bien d'autres choses \u2013 int\u00e9resse \u00e0 la fois les chercheurs civils et leurs coll\u00e8gues en uniforme. Ils apportent leur contribution \u00e0 ce sujet Des scientifiques<\/a><\/noindex> de l'Universit\u00e9 d'\u00c9tat de Pennsylvanie. Ils ont pu extraire de l'\u00e9lectricit\u00e9 d'une puissance de quelques milliwatts \u00e0 partir des champs magn\u00e9tiques des fils \u00e9lectriques \u00e0 proximit\u00e9, ce qui est suffisant, par exemple, pour alimenter directement un r\u00e9veil num\u00e9rique.<\/p>\n

\"Des<\/p>\n

Dans un article publi\u00e9 dans le journal Energy & Environmental Science<\/a><\/noindex> , les chercheurs ont expliqu\u00e9 leurs calculs et la fabrication de convertisseurs sp\u00e9ciaux de champs \u00e9lectromagn\u00e9tiques en courant \u00e9lectrique. L'\u00e9l\u00e9ment de production est con\u00e7u sous la forme d'une fine plaque multicouche avec unaimant permanent \u00e0 une extr\u00e9mit\u00e9 libre (l'autre extr\u00e9mit\u00e9 de la plaque est solidement fix\u00e9e). La plaque elle-m\u00eame est compos\u00e9e d'une couche de pi\u00e9zo\u00e9lectrique et d'une couche de mat\u00e9riau magn\u00e9tostrictif<\/a><\/noindex> (Fe85B5Si10 Metglas).<\/p>\n

Le mat\u00e9riau magn\u00e9tostrictif est int\u00e9ressant car, lorsqu'on modifie son \u00e9tat de magn\u00e9tisation, son volume et ses dimensions lin\u00e9aires changent. Le bourdonnement aga\u00e7ant des bobines dans les cartes graphiques est g\u00e9n\u00e9ralement d\u00fb \u00e0 des changements magn\u00e9tostrictifs dans les noyaux. Dans un champ magn\u00e9tique alternatif d'un c\u00e2blage classique \u00e0 une fr\u00e9quence de 50 ou 60 Hz, la plaque en Metglas commence \u00e0 vibrer et \u00e0 d\u00e9former la plaque en pi\u00e9zo\u00e9lectrique qui y est coll\u00e9e. Un courant commence \u00e0 circuler dans le circuit connect\u00e9 aux plaques.<\/p>\n

\"Des<\/p>\n

Cependant, le mat\u00e9riau magn\u00e9to-strictif associ\u00e9 \u00e0 un pi\u00e9zo\u00e9lectrique ne produit que jusqu'\u00e0 16 % de l'\u00e9lectricit\u00e9 g\u00e9n\u00e9r\u00e9e par l'\u00e9l\u00e9ment. La principale production d'\u00e9nergie provient de l'oscillation d'un aimant permanent dans un champ \u00e9lectromagn\u00e9tique. On affirme que la tension pico sur l'\u00e9l\u00e9ment atteint 80 V dans un champ de 300 \u00b5T. Mais ce qui est le plus pr\u00e9cieux, c'est que l'\u00e9l\u00e9ment d\u00e9velopp\u00e9 pouvait produire suffisamment d'\u00e9nergie pour alimenter directement une horloge num\u00e9rique dans un champ de moins de 50 \u00b5T \u00e0 une distance de 20 cm du c\u00e2blage \u00e9lectrique.<\/p>\n

<\/center><\/p>\n

Les chercheurs de l'Universit\u00e9 d'\u00c9tat de Pennsylvanie ont men\u00e9 leurs \u00e9tudes en collaboration avec des chercheurs de Virginia Tech et un groupe du Commandement de d\u00e9veloppement des capacit\u00e9s de combat de l'arm\u00e9e des \u00c9tats-Unis.<\/p>\n

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Source : 3dnews.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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