{"id":451,"date":"2018-01-06T08:22:09","date_gmt":"2018-01-06T11:22:09","guid":{"rendered":"https:\/\/museuweg.net\/blog\/?p=451"},"modified":"2026-02-09T15:45:03","modified_gmt":"2026-02-09T18:45:03","slug":"a-historia-do-motor-eletrico","status":"publish","type":"post","link":"https:\/\/museuweg.net\/blog\/a-historia-do-motor-eletrico\/","title":{"rendered":"A hist\u00f3ria do motor el\u00e9trico que voc\u00ea precisa conhecer"},"content":{"rendered":"<p>No mundo atual, repleto de tecnologias e constantes inova\u00e7\u00f5es, fica at\u00e9 dif\u00edcil imaginar a vida longe dos motores el\u00e9tricos e todas as facilidades que eles trouxeram, do dia a dia dom\u00e9stico \u00e0s ind\u00fastrias. Mas se hoje tudo isso parece t\u00e3o simples como ter um liquidificador, saiba que atingir esse est\u00e1gio foi um processo lento e gradativo.<\/p>\n<p>Levou quase tr\u00eas s\u00e9culos entre os primeiros estudos, pesquisas e inven\u00e7\u00f5es at\u00e9 o surgimento dos motores el\u00e9tricos, propriamente, em 1886. A descoberta \u00e9 atribu\u00edda ao cientista alem\u00e3o Werner Siemens, inventor do primeiro gerador de corrente cont\u00ednua auto induzido.<\/p>\n<p><strong>Voltando no tempo&#8230;<\/strong><\/p>\n<p>Em 1600 o cientista ingl\u00eas William Gilbert publicou uma obra descrevendo a for\u00e7a de atra\u00e7\u00e3o magn\u00e9tica. A primeira m\u00e1quina eletrost\u00e1tica foi constru\u00edda em 1663, pelo alem\u00e3o Otto Guericke, e aperfei\u00e7oada em 1774 pelo su\u00ed\u00e7o Martin Planta.<\/p>\n<p>J\u00e1 o professor de Medicina italiano Aloiso Galvani notou, em 1786, que ao tocar com o bisturi em coxas de r\u00e3s que estavam penduradas numa grade de ferro, estas apresentavam uma contra\u00e7\u00e3o, a qual chamou \u201celetricidade animal\u201d. Outro italiano, Alessandro Volta, descobriu que entre dois metais diferentes, imersos em l\u00edquido condutor, surgia uma tens\u00e3o el\u00e9trica.<\/p>\n<p>Em 1799 ele desenvolveu uma fonte de energia que chamou de \u201ccoluna de Volta\u201d, que podia fornecer corrente el\u00e9trica. O f\u00edsico dinamarqu\u00eas Hans Christian Oersted, em 1820, verificou por acaso que a agulha magn\u00e9tica de uma b\u00fassola era desviada de sua posi\u00e7\u00e3o norte-sul quando passava perto de um condutor no qual circulava corrente el\u00e9trica. Essa observa\u00e7\u00e3o foi o primeiro passo em dire\u00e7\u00e3o ao desenvolvimento do motor el\u00e9trico.<\/p>\n<p>O f\u00edsico e matem\u00e1tico Andr\u00e9-Marie Amp\u00e8re, com base nesses e outros estudos e constata\u00e7\u00f5es, construiu o primeiro eletro\u00edm\u00e3. Esse dispositivo foi fundamental para a inven\u00e7\u00e3o de v\u00e1rios aparelhos, como o telefone, o microfone, o alto-falante, o tel\u00e9grafo. Depois, o ingl\u00eas Michael Faraday descobriu, em 1831, a indu\u00e7\u00e3o eletromagn\u00e9tica.<\/p>\n<p>Em 1832 o cientista italiano S. Dal Negro construiu a primeira m\u00e1quina de corrente alternada com movimento de vaiv\u00e9m. No ano seguinte, o ingl\u00eas W. Ritchie inventou o comutador, construindo um pequeno motor el\u00e9trico em que o n\u00facleo de ferro enrolado girava em torno de um \u00edm\u00e3 permanente. Para dar uma rota\u00e7\u00e3o completa, a polaridade do eletro\u00edm\u00e3 era alternada a cada meia volta, atrav\u00e9s do comutador.<\/p>\n<p>O professor alem\u00e3o Moritz Hermann von Jacobi, em 1838, desenvolveu um motor el\u00e9trico e aplicou-o a uma lancha. A aplica\u00e7\u00e3o pr\u00e1tica da energia el\u00e9trica em trabalho mec\u00e2nico ficou assim comprovada. Entretanto, toda a energia provinha de baterias, que eram caras e de uso restrito. A preocupa\u00e7\u00e3o, ent\u00e3o, voltou-se \u00e0 gera\u00e7\u00e3o de energia el\u00e9trica de baixo custo.<\/p>\n<p><strong>A era Siemens<\/strong><\/p>\n<p>Em 1856 o eletrot\u00e9cnico Werner Siemens relatou o sucesso obtido na constru\u00e7\u00e3o de um gerador de corrente, magn\u00e9tico, com induzido T duplo. Mas esse aparelho n\u00e3o podia gerar energia suficiente para alimentar ind\u00fastrias e equipamentos dom\u00e9sticos. Os \u00edm\u00e3s permanentes eram de a\u00e7\u00e3o restrita.<\/p>\n<p>Somente dez anos depois Siemens construiu um gerador sem \u00edm\u00e3 permanente, provando que a tens\u00e3o necess\u00e1ria para o magnetismo podia ser retirada do pr\u00f3prio enrolamento do rotor, isso \u00e9, que a m\u00e1quina podia auto excitar-se. O primeiro d\u00ednamo de Werner Siemens possu\u00eda uma pot\u00eancia de aproximadamente 30 watts e uma rota\u00e7\u00e3o de 1.200 rpm. A m\u00e1quina tamb\u00e9m podia funcionar como motor, desde que se aplicasse uma corrente cont\u00ednua aos seus bornes.<\/p>\n<p><a href=\"https:\/\/museuweg.net\/blog\/wp-content\/uploads\/2017\/12\/motor-el\u00e9trico-2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-454 size-full\" src=\"https:\/\/museuweg.net\/blog\/wp-content\/uploads\/2017\/12\/motor-el\u00e9trico-2.jpg\" alt=\"motor-el\u00e9trico-2\" width=\"1100\" height=\"400\" srcset=\"https:\/\/museuweg.net\/blog\/wp-content\/uploads\/2017\/12\/motor-el\u00e9trico-2.jpg 1100w, https:\/\/museuweg.net\/blog\/wp-content\/uploads\/2017\/12\/motor-el\u00e9trico-2-300x109.jpg 300w\" sizes=\"auto, (max-width: 1100px) 100vw, 1100px\" \/><\/a><\/p>\n<p>Em 1879 a firma Siemens &amp; Halske apresentou a primeira locomotiva el\u00e9trica, com pot\u00eancia de 2 kW. Mas a m\u00e1quina tinha alto custo e era vulner\u00e1vel em servi\u00e7o, exigindo o desenvolvimento de um motor mais barato, robusto e de menor custo de manuten\u00e7\u00e3o.<\/p>\n<p><a href=\"https:\/\/museuweg.net\/blog\/wp-content\/uploads\/2017\/12\/motor-el\u00e9trico-3.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-455 size-full\" src=\"https:\/\/museuweg.net\/blog\/wp-content\/uploads\/2017\/12\/motor-el\u00e9trico-3.jpg\" alt=\"motor-el\u00e9trico-3\" width=\"1100\" height=\"400\" srcset=\"https:\/\/museuweg.net\/blog\/wp-content\/uploads\/2017\/12\/motor-el\u00e9trico-3.jpg 1100w, https:\/\/museuweg.net\/blog\/wp-content\/uploads\/2017\/12\/motor-el\u00e9trico-3-300x109.jpg 300w\" sizes=\"auto, (max-width: 1100px) 100vw, 1100px\" \/><\/a><\/p>\n<p><strong>Mais avan\u00e7os<\/strong><\/p>\n<p><strong>1885:<\/strong> o engenheiro eletricista italiano Galileu Ferraris construiu um motor de corrente alternada de duas fases.<br \/>\n1887: o iugoslavo Nicola Tesla apresentou um pequeno prot\u00f3tipo de motor de indu\u00e7\u00e3o bif\u00e1sico com rotor em curto-circuito.<\/p>\n<p><strong>1889:<\/strong> o engenheiro eletricista russo Michael von Dolivo Dobrowolsky, da firma AEG, de Berlim, persistindo na pesquisa do motor de corrente alternada, entrou com pedido de patente de um motor trif\u00e1sico com rotor de gaiola. Ele era simples, silencioso, tinha menos manuten\u00e7\u00e3o e alta seguran\u00e7a em opera\u00e7\u00e3o.<\/p>\n<p><strong>1891:<\/strong> Dobrowolsky iniciou a fabrica\u00e7\u00e3o em s\u00e9rie de motores ass\u00edncronos, nas pot\u00eancias de 0,4 a 7,5 kW.<\/p>\n<p><a href=\"https:\/\/museuweg.net\/blog\/wp-content\/uploads\/2017\/12\/motor-el\u00e9trico-4.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-452 size-full\" src=\"https:\/\/museuweg.net\/blog\/wp-content\/uploads\/2017\/12\/motor-el\u00e9trico-4.jpg\" alt=\"motor-el\u00e9trico-4\" width=\"1100\" height=\"400\" srcset=\"https:\/\/museuweg.net\/blog\/wp-content\/uploads\/2017\/12\/motor-el\u00e9trico-4.jpg 1100w, https:\/\/museuweg.net\/blog\/wp-content\/uploads\/2017\/12\/motor-el\u00e9trico-4-300x109.jpg 300w\" sizes=\"auto, (max-width: 1100px) 100vw, 1100px\" \/><\/a><\/p>\n<p>Em resumo, cientistas, f\u00edsicos e outros profissionais nem sempre ligados \u00e0 ci\u00eancia contribu\u00edram para a descoberta do motor el\u00e9trico, que acelerou a industrializa\u00e7\u00e3o mundial e transformou radicalmente o modo de vida das pessoas. Essa hist\u00f3ria, de forma completa, est\u00e1 dispon\u00edvel no livro \u201cO Motor El\u00e9trico\u201d que est\u00e1 dispon\u00edvel no site do Museu WEG.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>No mundo atual, repleto de tecnologias e constantes inova\u00e7\u00f5es, fica at\u00e9 dif\u00edcil imaginar a vida longe dos motores el\u00e9tricos e&#8230;<\/p>\n","protected":false},"author":4,"featured_media":453,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,4],"tags":[102,103,56,48,98,99,8,97,22,101,100],"class_list":["post-451","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-eletricidade","category-weg","tag-ampere","tag-corrente","tag-historia","tag-historia-do-motor","tag-historia-do-motor-eletrico","tag-invencao-do-motor","tag-motor","tag-motor-eletrico","tag-museu-weg","tag-siemens","tag-werner-siemens"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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