{"id":3048,"date":"2023-03-06T07:53:13","date_gmt":"2023-03-06T07:53:13","guid":{"rendered":"https:\/\/hsmagnet.com\/?page_id=3048"},"modified":"2025-08-13T02:18:56","modified_gmt":"2025-08-13T02:18:56","slug":"ima-de-alto-falante","status":"publish","type":"page","link":"https:\/\/hsmagnet.com\/pt\/magnetic-applications\/loudspeaker-magnet\/","title":{"rendered":"\u00cdm\u00e3 de alto-falante"},"content":{"rendered":"<h2>O que \u00e9 \u00edm\u00e3 de alto-falante?<\/h2>\n<p>Um alto-falante \u00e9 um dispositivo que converte um sinal el\u00e9trico de \u00e1udio em som. Ele faz isso movendo um cone (geralmente feito de papel) para frente e para tr\u00e1s na frente de uma bobina de fio, o que gera uma corrente alternada. Essa corrente flui atrav\u00e9s do \u00edm\u00e3 e cria um campo magn\u00e9tico ao seu redor. Isso faz com que o ferro dentro da bobina se mova, o que tamb\u00e9m cria uma corrente el\u00e9trica na bobina, completando o circuito e fazendo a eletricidade fluir atrav\u00e9s dele. As correntes el\u00e9tricas criam campos magn\u00e9ticos que se empurram para criar uma \u00e1rea entre eles onde s\u00e3o \u00edm\u00e3s muito fortes (o Polo Norte e o Polo Sul). Quanto mais fortes esses \u00edm\u00e3s ficam, mais forte \u00e9 a for\u00e7a deles um contra o outro para tornar essa \u00e1rea menor porque quando eles atingem seu ponto m\u00e1ximo, semelhante atrai semelhante. Quanto mais pr\u00f3ximos esses dois \u00edm\u00e3s se unem, for\u00e7a as part\u00edculas de ar entre eles para fora, fazendo com que sejam empurradas para longe uma da outra, bem como empurrando as part\u00edculas de ar em ambos os lados deles para tr\u00e1s\/para fora. O alto-falante move esse cone para frente e para tr\u00e1s em alta velocidade com energia ac\u00fastica criada a partir do espa\u00e7o entre essas duas for\u00e7as opostas que se empurram, o que come\u00e7a a criar vibra\u00e7\u00e3o em toda a sua estrutura, o que faz com que ondas sonoras sejam criadas pela press\u00e3o em nossos t\u00edmpanos.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3050\" src=\"https:\/\/hsmagnet.com\/wp-content\/uploads\/2023\/03\/Speaker-Cross-Section.jpg\" alt=\"Se\u00e7\u00e3o transversal do alto-falante\" width=\"413\" height=\"307\" srcset=\"https:\/\/hsmagnet.com\/wp-content\/uploads\/2023\/03\/Speaker-Cross-Section.jpg 413w, https:\/\/hsmagnet.com\/wp-content\/uploads\/2023\/03\/Speaker-Cross-Section-300x223.jpg 300w\" sizes=\"auto, (max-width: 413px) 100vw, 413px\" \/><\/p>\n<h2>Material magn\u00e9tico para \u00edm\u00e3 de alto-falante<\/h2>\n<h3>\u00cdm\u00e3 de ferrite<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-2832 size-medium\" src=\"https:\/\/hsmagnet.com\/wp-content\/uploads\/2023\/02\/ring-D60xd32x83-300x298.jpg\" alt=\"\u00edm\u00e3 de alto-falante \u00edm\u00e3 de ferrite\" width=\"300\" height=\"298\" \/>UM <a href=\"https:\/\/hsmagnet.com\/pt\/materiais-magneticos\/imas-de-ferrite\/\">\u00cdm\u00e3 de ferrite<\/a> \u00e9 um \u00edm\u00e3 feito de ferrite, um composto \u00e0 base de ferro. \u00c9 um tipo de cer\u00e2mica e \u00e9 frequentemente usado em alto-falantes porque tem alta permeabilidade magn\u00e9tica, mas baixa coercividade. A palavra &quot;ferrite&quot; vem do min\u00e9rio de ferro que cont\u00e9m um alto n\u00edvel de \u00f3xido de ferro. Os \u00edm\u00e3s de ferrite s\u00e3o geralmente baratos, mas t\u00eam desempenho inferior a outros tipos de \u00edm\u00e3s, como \u00edm\u00e3s de terras raras de neod\u00edmio. Eles tamb\u00e9m t\u00eam menor resist\u00eancia \u00e0 desmagnetiza\u00e7\u00e3o, o que significa que podem precisar ser substitu\u00eddos com mais frequ\u00eancia em algumas aplica\u00e7\u00f5es. O uso mais comum para ferrites \u00e9 em alto-falantes porque eles t\u00eam boas propriedades de permeabilidade magn\u00e9tica que resultam em boa qualidade de som; no entanto, sua baixa coercividade normalmente os limita ao uso em frequ\u00eancias de \u00e1udio apenas com n\u00edveis de pot\u00eancia inferiores a 10 watts ou mais a 8 ohms de imped\u00e2ncia.<\/p>\n<h3>\u00cdm\u00e3 de Alnico<\/h3>\n<p>Um <a href=\"https:\/\/hsmagnet.com\/pt\/materiais-magneticos\/imas-de-alnico\/\">\u00cdm\u00e3 de alnico<\/a> \u00c9 um tipo de \u00edm\u00e3 permanente feito de uma liga de alum\u00ednio, n\u00edquel e cobalto, em uso h\u00e1 mais de 50 anos. O \u00edm\u00e3 de Alnico pode ser usado em alto-falantes, mas n\u00e3o normalmente. Na ind\u00fastria de som, os \u00edm\u00e3s de Alnico s\u00e3o amplamente utilizados em captadores de guitarra e fones de ouvido. \u00c9 muito mais caro do que os \u00edm\u00e3s de ferrite e tem desempenho magn\u00e9tico inferior ao dos materiais magn\u00e9ticos de aterramento traseiro, especialmente porque a energia magn\u00e9tica por unidade de peso n\u00e3o \u00e9 t\u00e3o forte, o \u00edm\u00e3 m\u00f3vel n\u00e3o pode ser movido pela bobina magn\u00e9tica.<\/p>\n<h3>\u00cdm\u00e3 SmCo<\/h3>\n<p>Comparando o \u00edm\u00e3 de ferrite e o \u00edm\u00e3 de alnico, o <a href=\"https:\/\/hsmagnet.com\/pt\/materiais-magneticos\/imas-smco\/\">\u00cdm\u00e3 SmCo<\/a> apresenta desempenho muito melhor em propriedades magn\u00e9ticas. H\u00e1 muito se reconhece que a bobina m\u00f3vel poderia ser estacion\u00e1ria e o \u00edm\u00e3 permanente usado para vibrar o cone do alto-falante. No entanto, os \u00edm\u00e3s permanentes anteriormente dispon\u00edveis tinham massa excessiva por unidade de for\u00e7a magn\u00e9tica para funcionar satisfatoriamente como \u00edm\u00e3s m\u00f3veis em um alto-falante. At\u00e9 mesmo os \u00edm\u00e3s de alnico eram muito massivos por unidade de for\u00e7a magn\u00e9tica para servir como \u00edm\u00e3s m\u00f3veis em um alto-falante. O \u00edm\u00e3 de SmCo resolve esse problema.<\/p>\n<h3>\u00cdm\u00e3 de neod\u00edmio<\/h3>\n<p>Neod\u00edmio \u00e9 um tipo de metal de terras raras usado em \u00edm\u00e3s de alto-falantes. <a href=\"https:\/\/hsmagnet.com\/pt\/materiais-magneticos\/imas-ndfeb\/\">\u00cdm\u00e3s de neod\u00edmio<\/a> S\u00e3o os \u00edm\u00e3s permanentes mais fortes dispon\u00edveis comercialmente e t\u00eam uma ampla gama de utiliza\u00e7\u00f5es, incluindo motores de carros el\u00e9tricos, turbinas e\u00f3licas e dispositivos como iPods. O neod\u00edmio \u00e9 o \u00edm\u00e3 mais potente j\u00e1 desenvolvido. Tornou-se amplamente utilizado porque comprovadamente \u00e9 resistente \u00e0 degrada\u00e7\u00e3o pelo calor e oferece mais energia do que qualquer outro \u00edm\u00e3 no mercado atualmente. Assim, os \u00edm\u00e3s de neod\u00edmio s\u00e3o encontrados em muitos eletr\u00f4nicos comuns, como iPods, Blackberrys e laptops. Por exemplo, uma empresa que fabrica alto-falantes de neod\u00edmio afirma que seu produto produz um som tr\u00eas vezes melhor do que os alto-falantes anteriores com n\u00facleos de ferro.<\/p>","protected":false},"excerpt":{"rendered":"<p>What Is Speaker Magnet? A loudspeaker is a device that converts an electrical audio signal into sound. It does so by moving a cone (usually made of paper) back and forth in front of a coil of wire, which generates an alternating current. This current flows through the magnet and creates a magnetic field around [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":927,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_eb_attr":"","footnotes":""},"class_list":["post-3048","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>loudspeaker magnet - magnet applications -permanent magnet<\/title>\n<meta name=\"description\" content=\"loudspeaker magnet is an important application of permanent magnets ferrite magnet is the most popular because of low price SmCo magnet\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hsmagnet.com\/pt\/aplicacoes-magneticas\/ima-de-alto-falante\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"loudspeaker magnet - 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