{"id":1464,"date":"2025-02-17T08:41:23","date_gmt":"2025-02-17T08:41:23","guid":{"rendered":"https:\/\/nbaem.com\/?p=1464"},"modified":"2025-02-17T08:42:29","modified_gmt":"2025-02-17T08:42:29","slug":"ferrite-magnet-vs-neodymium","status":"publish","type":"post","link":"https:\/\/nbaem.com\/cs\/ferrite-magnet-vs-neodymium\/","title":{"rendered":"Ferritov\u00fd magnet vs neodymiov\u00fd magnet"},"content":{"rendered":"

 <\/p>\n

Neodymov\u00e9 magnety, tak\u00e9 naz\u00fdvan\u00e9 magnety vz\u00e1cn\u00fdch zemin, se staly velmi popul\u00e1rn\u00edmi, proto\u017ee jsou tak siln\u00e9. Jsou mnohem siln\u011bj\u0161\u00ed ne\u017e ferritov\u00e9 magnety, i kdy\u017e jsou velmi mal\u00e9. Ale ka\u017ed\u00fd m\u00e1 sv\u00e9 v\u00fdhody a nev\u00fdhody, tak\u017ee jsou vhodn\u011bj\u0161\u00ed pro r\u016fzn\u00e9 \u00fa\u010dely.<\/p>\n

 <\/p>\n

Typy magnet\u016f<\/strong><\/span><\/h2>\n

Magnety vytv\u00e1\u0159ej\u00ed magnetick\u00e9 pole, kter\u00e9 p\u0159itahuje ur\u010dit\u00e9 kovy. Toto pole m\u016f\u017ee poch\u00e1zet z p\u0159irozen\u00e9ho magnetu nebo z vyroben\u00e9ho magnetu. Dva z nejb\u011b\u017en\u011bj\u0161\u00edch um\u011bl\u00fdch magnet\u016f jsou ferrit a neodym. Oba se naz\u00fdvaj\u00ed \u201epermanentn\u00ed\u201c magnety, proto\u017ee z\u016fstanou magnety nav\u017edy, pokud nejsou po\u0161kozeny nebo demagnetizov\u00e1ny. Ale neodymov\u00e9 magnety jsou mnohem siln\u011bj\u0161\u00ed ne\u017e ferritov\u00e9 magnety, tak\u017ee se dnes pou\u017e\u00edvaj\u00ed v mnoha dal\u0161\u00edch v\u011bcech.<\/p>\n

 <\/p>\n

Ferritov\u00e9 magnety<\/a>: Star\u00e9 \u0161koln\u00ed, levn\u00e9, ale slab\u00e9<\/strong><\/span><\/h2>\n

\"ferritov\u00fd<\/p>\n

Ferritov\u00e9 magnety jsou na trhu od 50. let 20. stolet\u00ed a st\u00e1le se hodn\u011b pou\u017e\u00edvaj\u00ed, proto\u017ee jsou levn\u00e9. Vyrob\u00ed se sm\u00edch\u00e1n\u00edm ferritov\u00fdch materi\u00e1l\u016f, jako je strontium nebo barium ferrit. M\u016f\u017eete je tvarovat do jak\u00e9hokoliv tvaru. Jsou tak\u00e9 velmi odoln\u00e9 v\u016f\u010di korozi, tak\u017ee na nich nen\u00ed t\u0159eba \u017e\u00e1dn\u00fd povlak, pokud budou pou\u017e\u00edv\u00e1ny v mokr\u00e9m prost\u0159ed\u00ed. Tak\u00e9 neztr\u00e1cej\u00ed svou magnetizaci tak rychle p\u0159i vysok\u00fdch teplot\u00e1ch. Hlavn\u00ed nev\u00fdhodou ferritov\u00fdch magnet\u016f je, \u017ee nejsou p\u0159\u00edli\u0161 siln\u00e9.<\/p>\n

\u00a0<\/strong><\/p>\n

Neodymov\u00e9 magnety<\/a>: Siln\u00e9, ale drah\u00e9<\/strong><\/span><\/h2>\n

\"\"<\/p>\n

Neodymov\u00e9 magnety byly vyvinuty v 70. letech 20. stolet\u00ed. Pat\u0159\u00ed do rodiny magnet\u016f vz\u00e1cn\u00fdch zemin a jsou opravdu siln\u00e9. Jsou dra\u017e\u0161\u00ed ne\u017e ferritov\u00e9 magnety, ale jsou mnohem siln\u011bj\u0161\u00ed. Nejlep\u0161\u00ed neodymov\u00e9 magnety (jako N52) jsou 6,5kr\u00e1t siln\u011bj\u0161\u00ed ne\u017e nejlep\u0161\u00ed ferritov\u00e9 magnety (jako C8). Proto se neodymov\u00e9 magnety pou\u017e\u00edvaj\u00ed tam, kde je pot\u0159eba mal\u00fd magnet s velkou p\u0159ita\u017elivost\u00ed. Najdete je v motorech, pevn\u00fdch disc\u00edch a \u0161pi\u010dkov\u00e9 elektronice.<\/p>\n

Ale existuj\u00ed i n\u011bkter\u00e9 nev\u00fdhody neodymov\u00fdch magnet\u016f. Jsou n\u00e1chyln\u011bj\u0161\u00ed ke korozi ne\u017e ferritov\u00e9 magnety, tak\u017ee na nich mus\u00ed b\u00fdt n\u011bjak\u00fd ochrann\u00fd povlak. M\u016f\u017ee to b\u00fdt nikl nebo epoxid. Mus\u00edte s nimi b\u00fdt opatrn\u00ed, proto\u017ee jsou k\u0159ehk\u00e9 a mohou se rozb\u00edt, pokud na sebe naraz\u00ed. A nemaj\u00ed r\u00e1dy vysok\u00e9 teploty. V\u011bt\u0161ina t\u0159\u00edd neodymov\u00fdch magnet\u016f ztr\u00e1c\u00ed svou magnetizaci, pokud se p\u0159\u00edli\u0161 zah\u0159ej\u00ed.<\/p>\n

 <\/p>\n

Ferritov\u00fd magnet vs Neodym <\/strong><\/span><\/h2>\n

P\u0159i srovn\u00e1n\u00ed ferritov\u00fdch magnet\u016f s neodymov\u00fdmi magnety je t\u0159eba zv\u00e1\u017eit n\u00e1sleduj\u00edc\u00ed v\u011bci:<\/p>\n

Magnetick\u00e1 s\u00edla (BHmax): Neodymov\u00e9 magnety jsou mnohem siln\u011bj\u0161\u00ed. Nejlep\u0161\u00ed neodymov\u00fd magnet (N52) je asi 6,5kr\u00e1t siln\u011bj\u0161\u00ed ne\u017e nejlep\u0161\u00ed ferritov\u00fd magnet (C8).<\/p>\n

Koercitivn\u00ed s\u00edla: Neodymov\u00e9 magnety jsou odoln\u011bj\u0161\u00ed v\u016f\u010di demagnetizaci ne\u017e ferritov\u00e9 magnety. Siln\u00fd neodymov\u00fd magnet m\u016f\u017ee demagnetizovat ferritov\u00fd magnet.<\/p>\n

Maxim\u00e1ln\u00ed provozn\u00ed teplota: Ferritov\u00e9 magnety snesou vy\u0161\u0161\u00ed teploty (a\u017e do 250\u00b0C) bez v\u00fdrazn\u00e9 ztr\u00e1ty magnetismu. Neodymov\u00e9 magnety maj\u00ed ni\u017e\u0161\u00ed maxim\u00e1ln\u00ed provozn\u00ed teploty, ale existuj\u00ed i t\u0159\u00eddy s vysokou teplotn\u00ed odolnost\u00ed, kter\u00e9 snesou a\u017e 220\u00b0C.<\/p>\n

Odolnost v\u016f\u010di korozi: Ferritov\u00e9 magnety jsou l\u00e9pe odoln\u00e9 v\u016f\u010di korozi a obvykle nepot\u0159ebuj\u00ed \u017e\u00e1dn\u00e9 povlaky. Neodymov\u00e9 magnety mus\u00ed m\u00edt povlaky (nikl, epoxid, plast), proto\u017ee jsou p\u0159ev\u00e1\u017en\u011b z \u017eeleza.<\/p>\n

 <\/p>\n

Kdy co pou\u017e\u00edvat: Cena vs. V\u00fdkon<\/strong><\/span><\/h2>\n

Pokud jde o cenu, ferritov\u00e9 magnety jsou nejlevn\u011bj\u0161\u00ed. Pokud chcete u\u0161et\u0159it pen\u00edze, ferritov\u00e9 magnety jsou spr\u00e1vn\u00e1 volba. Ale pokud porovn\u00e1te, kolik ta\u017en\u00e9 s\u00edly dostanete za korunu, neodymov\u00e9 magnety v\u00e1m obvykle poskytnou v\u00edce ta\u017en\u00e9 s\u00edly za va\u0161e pen\u00edze. Nap\u0159\u00edklad neodymov\u00fd magnet s ta\u017enou silou 2,9 kg m\u016f\u017ee st\u00e1t 25 K\u010d, zat\u00edmco ferritov\u00fd magnet s ta\u017enou silou 0,45 kg m\u016f\u017ee st\u00e1t 8 K\u010d. Kdy\u017e porovn\u00e1te s\u00edlu na korunu, neodymov\u00e9 magnety jsou v\u00fdhodn\u011bj\u0161\u00ed.<\/p>\n

\u00a0<\/strong><\/p>\n

Odolnost a dlouhov\u011bkost<\/strong><\/span><\/h2>\n

Neodymov\u00e9 magnety si udr\u017e\u00ed svou magnetizaci po dlouhou dobu. Pokud je nezah\u0159ejete p\u0159\u00edli\u0161 nebo nezni\u010d\u00edte, ztrat\u00ed p\u0159ibli\u017en\u011b 11 % sv\u00e9 magnetizace za desetilet\u00ed. Ferritov\u00e9 magnety maj\u00ed v\u011bt\u0161\u00ed pravd\u011bpodobnost ztr\u00e1ty magnetizace v pr\u016fb\u011bhu \u010dasu a mohou b\u00fdt pot\u0159eba je znovu magnetizovat.<\/p>\n

 <\/p>\n

Pro\u010d zvolit neodymov\u00e9 magnety?<\/strong><\/span><\/h2>\n

Ferritov\u00e9 magnety jsou levn\u00e9 a skv\u011ble funguj\u00ed pro mnoho v\u011bc\u00ed. Ale pokud pot\u0159ebujete n\u011bco opravdu siln\u00e9ho, velmi mal\u00e9ho a s dlouhou \u017eivotnost\u00ed, pot\u0159ebujete neodymov\u00fd magnet. Neodymov\u00e9 magnety jsou d\u016fvodem, pro\u010d dnes m\u016f\u017eeme vyr\u00e1b\u011bt tak mal\u00e9 a efektivn\u00ed v\u011bci. Nev\u00fdhodou je, \u017ee jsou dra\u017e\u0161\u00ed a pot\u0159ebuj\u00ed povlaky. V\u00fdhodou je, \u017ee jsou opravdu siln\u00e9 a vydr\u017e\u00ed nav\u017edy, pokud je nezah\u0159ejete p\u0159\u00edli\u0161 nebo nezni\u010d\u00edte. Pokud pou\u017e\u00edv\u00e1te ferritov\u00e9 magnety a chcete v\u011bd\u011bt, jestli m\u016f\u017eete m\u00edsto nich pou\u017e\u00edt neodymov\u00fd magnet, pora\u010fte se s in\u017een\u00fdrem. M\u016f\u017ee v\u00e1m pomoci dos\u00e1hnout lep\u0161\u00edho v\u00fdkonu va\u0161eho produktu.<\/p>","protected":false},"excerpt":{"rendered":"

  Neodymov\u00e9 magnety, tak\u00e9 naz\u00fdvan\u00e9 vz\u00e1cn\u00e9 zeminy, se staly velmi popul\u00e1rn\u00edmi, proto\u017ee jsou tak siln\u00e9. Jsou mnohem siln\u011bj\u0161\u00ed ne\u017e ferritov\u00e9 magnety, i kdy\u017e jsou velmi mal\u00e9. Ale existuj\u00ed ur\u010dit\u00e9 v\u00fdhody a nev\u00fdhody u ka\u017ed\u00e9ho, tak\u017ee jsou vhodn\u011bj\u0161\u00ed pro r\u016fzn\u00e9 \u00fa\u010dely. Typy magnet\u016f [...]<\/p>","protected":false},"author":1,"featured_media":640,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_mi_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1464","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"jetpack_featured_media_url":"https:\/\/nbaem.com\/wp-content\/uploads\/2022\/06\/ferrite-arc-magnet-\u4e3b\u56fe.png","_links":{"self":[{"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/posts\/1464","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/comments?post=1464"}],"version-history":[{"count":1,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/posts\/1464\/revisions"}],"predecessor-version":[{"id":1465,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/posts\/1464\/revisions\/1465"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/media\/640"}],"wp:attachment":[{"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/media?parent=1464"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/categories?post=1464"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/tags?post=1464"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}