{"id":1583,"date":"2025-05-12T03:02:42","date_gmt":"2025-05-12T03:02:42","guid":{"rendered":"https:\/\/nbaem.com\/?p=1583"},"modified":"2025-05-12T03:03:22","modified_gmt":"2025-05-12T03:03:22","slug":"magnets-strongest","status":"publish","type":"post","link":"https:\/\/nbaem.com\/cs\/magnets-strongest\/","title":{"rendered":"Nejsiln\u011bj\u0161\u00ed permanentn\u00ed magnet \u2013 Neodymov\u00fd magnet"},"content":{"rendered":"

Nejv\u00fdkonn\u011bj\u0161\u00ed trval\u00fd magnet \u2013 Neodymov\u00fd magnet<\/h1>\n\n

Magnety jsou v\u0161ude, ale m\u00e1lo lid\u00ed v\u00ed, kter\u00fd z nich je skute\u010dn\u011b nejv\u00fdkonn\u011bj\u0161\u00ed.<\/p>\n

Neodymov\u00e9 magnety jsou nejsiln\u011bj\u0161\u00ed trval\u00e9 magnety dostupn\u00e9 dnes, p\u0159ekon\u00e1vaj\u00ed v\u0161echny ostatn\u00ed typy jak v magnetick\u00e9 s\u00edle, tak v hustot\u011b energie.<\/strong><\/p>\n

\"neodymov\u00fd

prstencov\u00fd magnet \u2013 blokov\u00fd magnet \u2013 v\u00e1lcov\u00fd magnet \u2013 magnet s otvorem<\/p><\/div>\n

Neodymov\u00e9 magnety zm\u011bnily n\u00e1\u0161 pohled na magnetickou s\u00edlu. Jejich mal\u00e1 velikost skr\u00fdv\u00e1 neuv\u011b\u0159itelnou s\u00edlu. Poj\u010fme prozkoumat, co je \u010din\u00ed tak \u00fa\u010dinn\u00fdmi \u2013 a pro\u010d z\u016fst\u00e1vaj\u00ed nep\u0159ekonan\u00e9 na trhu.<\/p>\n

Jak\u00e1 je nejvy\u0161\u0161\u00ed magnetick\u00e1 s\u00edla?<\/h2>\n

V\u011bt\u0161ina lid\u00ed si mysl\u00ed, \u017ee velk\u00e9 magnety mus\u00ed b\u00fdt nejsiln\u011bj\u0161\u00ed. To nen\u00ed v\u017edy pravda.<\/p>\n

Nejvy\u0161\u0161\u00ed magnetick\u00e1 s\u00edla poch\u00e1z\u00ed z neodymov\u00fdch magnet\u016f, konkr\u00e9tn\u011b t\u011bch s t\u0159\u00eddami jako N52, kter\u00e9 maj\u00ed energetick\u00e9 produkty p\u0159es 50 MGOe. M\u00e1me tak\u00e9 N54, N55. <\/strong><\/p>\n

\"\"<\/p>\n

Porozum\u011bn\u00ed magnetick\u00e9 s\u00edle v re\u00e1ln\u00fdch term\u00ednech<\/h3>\n

Pro pochopen\u00ed magnetick\u00e9 s\u00edly v\u017edy sleduji maxim\u00e1ln\u00ed energetick\u00fd produkt, nebo (BH)max. Tato hodnota n\u00e1m \u0159\u00edk\u00e1, kolik magnetick\u00e9 energie m\u016f\u017ee materi\u00e1l ulo\u017eit. Vy\u0161\u0161\u00ed hodnoty znamenaj\u00ed siln\u011bj\u0161\u00ed magnety. Neodymov\u00e9 magnety se obvykle pohybuj\u00ed od 30 do 55 MGOe, v z\u00e1vislosti na t\u0159\u00edd\u011b.<\/p>\n

Zde je rychl\u00e1 srovn\u00e1vac\u00ed tabulka:<\/p>\n\n\n\n\n\n\n\n\n
Typ magnetu<\/th>\n(BH)max Rozsah (MGOe)<\/th>\nRelativn\u00ed s\u00edla<\/th>\n<\/tr>\n<\/thead>\n
Ferrit (keramick\u00fd)<\/a><\/span><\/td>\n3 \u2013 4<\/td>\nN\u00edzk\u00e1<\/td>\n<\/tr>\n
Alnico<\/a><\/span><\/td>\n5 \u2013 9<\/td>\nM\u00edrn\u00e1<\/td>\n<\/tr>\n
Samarium Kobalt<\/a><\/span><\/td>\n18 \u2013 30<\/td>\nVysok\u00e1<\/td>\n<\/tr>\n
Neodym (NdFeB<\/span><\/a>)<\/span><\/td>\n30 \u2013 55<\/td>\nVelmi vysok\u00e1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

N55 je nejsiln\u011bj\u0161\u00ed t\u0159\u00edda b\u011b\u017en\u011b pou\u017e\u00edvan\u00e1 dnes. N\u011bkter\u00e1 laborato\u0159 vytvo\u0159ila vy\u0161\u0161\u00ed t\u0159\u00eddy, ale nejsou \u0161iroce dostupn\u00e9 kv\u016fli n\u00e1klad\u016fm a ot\u00e1zk\u00e1m stability.<\/p>\n

Co \u010din\u00ed magnet siln\u011bj\u0161\u00edm?<\/h2>\n

N\u011bkter\u00e9 magnety vypadaj\u00ed stejn\u011b, ale funguj\u00ed velmi odli\u0161n\u011b.<\/p>\n

S\u00edla magnetu z\u00e1vis\u00ed na jeho slo\u017een\u00ed materi\u00e1lu, vnit\u0159n\u00ed struktu\u0159e, v\u00fdrobn\u00edm procesu a t\u0159\u00edd\u011b.<\/strong><\/p>\n

\"Tok

Proces v\u00fdroby neodymov\u00fdch magnet\u016f<\/p><\/div>\n

V\u011bda za silou magnetu<\/h3>\n

Existuj\u00ed \u010dty\u0159i kl\u00ed\u010dov\u00e9 faktory, kter\u00e9 ovliv\u0148uj\u00ed magnetickou s\u00edlu:<\/p>\n

1. Slo\u017een\u00ed<\/h4>\n

Neodymov\u00e9 magnety jsou vyrobeny z sm\u011bsi neodymu, \u017eeleza a boru (Nd\u2082Fe\u2081\u2084B). Tato kombinace vytv\u00e1\u0159\u00ed velmi hust\u00e9 magnetick\u00e9 pole. Ferritov\u00e9 magnety, naopak, pou\u017e\u00edvaj\u00ed strontium nebo barium a nab\u00edzej\u00ed mnohem men\u0161\u00ed s\u00edlu.<\/p>\n

2. Krystalick\u00e1 struktura<\/h4>\n

D\u016fle\u017eit\u00e1 je uspo\u0159\u00e1d\u00e1n\u00ed atom\u016f uvnit\u0159 magnetu. Neodymov\u00e9 magnety maj\u00ed tetragon\u00e1ln\u00ed krystalickou strukturu, kter\u00e1 podporuje vysokou magnetizaci. Tato struktura pom\u00e1h\u00e1 uzamknout magnetick\u00e9 pole a odol\u00e1v\u00e1 demagnetizaci.<\/p>\n

\"Krystalick\u00e1

Tetragon\u00e1ln\u00ed krystalick\u00e1 struktura Nd\u2082Fe\u2081\u2084B<\/p><\/div>\n

3. T\u0159\u00edda<\/h4>\n

T\u0159\u00edda (nap\u0159\u00edklad N35, N42, N55) n\u00e1m \u0159\u00edk\u00e1, jak je magnet siln\u00fd. Vy\u0161\u0161\u00ed t\u0159\u00eddy maj\u00ed v\u00edce magnetick\u00e9 energie na jednotku objemu. Ale magnety s vy\u0161\u0161\u00ed t\u0159\u00eddou jsou tak\u00e9 k\u0159eh\u010d\u00ed a citliv\u011bj\u0161\u00ed na teplo.<\/p>\n

4. Kvalita v\u00fdroby<\/h4>\n

Sinterov\u00e1n\u00ed, lisov\u00e1n\u00ed a povrchov\u00e9 \u00fapravy ovliv\u0148uj\u00ed v\u00fdkon fin\u00e1ln\u00edho magnetu. Pokud je v\u00fdrobn\u00ed proces nekonzistentn\u00ed, m\u016f\u017ee magnet \u0161patn\u011b fungovat nebo se rychle zhor\u0161it.<\/p>\n

Porovn\u00e1n\u00ed t\u011bchto faktor\u016f:<\/p>\n\n\n\n\n\n\n\n\n
Faktor<\/th>\nVliv na s\u00edlu<\/th>\nPozn\u00e1mky<\/th>\n<\/tr>\n<\/thead>\n
Slo\u017een\u00ed<\/td>\nVelmi vysok\u00e1<\/td>\nNdFeB je nejlep\u0161\u00ed<\/td>\n<\/tr>\n
Krystalick\u00e1 struktura<\/td>\nVysok\u00e1<\/td>\nVy\u017eaduje p\u0159\u00edsnou kontrolu b\u011bhem v\u00fdroby<\/td>\n<\/tr>\n
T\u0159\u00edda<\/td>\nVelmi vysok\u00e1<\/td>\nN55 nejvy\u0161\u0161\u00ed dostupn\u00e1 \u0161iroce<\/td>\n<\/tr>\n
Kvalita procesu<\/td>\nM\u00edrn\u00e1 a\u017e vysok\u00e1<\/td>\nOvliv\u0148uje stabilitu a odolnost<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Pracoval jsem s mnoha dodavateli. Nejlep\u0161\u00ed z nich v\u017edy kontroluj\u00ed tyto \u010dty\u0159i faktory p\u0159\u00edsn\u00fdmi normami QC.<\/p>\n

Kter\u00fd magnet je nejsiln\u011bj\u0161\u00ed?<\/h2>\n

Ne v\u0161echny magnety jsou stejn\u00e9 \u2014 i uvnit\u0159 stejn\u00e9ho typu.<\/p>\n

Neodymov\u00e9 magnety jsou nejsiln\u011bj\u0161\u00ed a mezi nimi nab\u00edz\u00ed t\u0159\u00edda N55 nejvy\u0161\u0161\u00ed magnetick\u00fd v\u00fdkon.<\/strong><\/p>\n

Porovn\u00e1n\u00ed neodymov\u00fdch t\u0159\u00edd<\/h3>\n

Dovolte mi sd\u00edlet n\u011bco ze sv\u00e9 ka\u017edodenn\u00ed pr\u00e1ce. Kdy\u017e z\u00e1kazn\u00edci po\u017eaduj\u00ed \u201enejsiln\u011bj\u0161\u00ed magnet\u201c, obvykle jim ukazuji neodymov\u00e9 magnety N55. Ty poskytuj\u00ed nejvy\u0161\u0161\u00ed tahovou s\u00edlu v nejmen\u0161\u00ed velikosti.<\/p>\n

Ale N55 nen\u00ed nejlep\u0161\u00ed pro ka\u017ed\u00e9 pou\u017eit\u00ed. M\u016f\u017ee se snadno od\u0161t\u00edpnout a ztr\u00e1c\u00ed s\u00edlu p\u0159i vysok\u00fdch teplot\u00e1ch. Proto \u010dasto doporu\u010duji N42 nebo N48 pro venkovn\u00ed nebo motorov\u00e9 aplikace.<\/p>\n\n\n\n\n\n\n\n
T\u0159\u00edda<\/th>\n(BH)max (MGOe)<\/th>\nS\u00edla<\/th>\nOdolnost v\u016f\u010di teplu<\/th>\nCena<\/th>\n<\/tr>\n<\/thead>\n
N35<\/td>\n~35<\/td>\nSt\u0159edn\u00ed<\/td>\nDobr\u00e1<\/td>\nN\u00edzk\u00e1<\/td>\n<\/tr>\n
N42<\/td>\n~42<\/td>\nVysok\u00e1<\/td>\nLep\u0161\u00ed<\/td>\nSt\u0159edn\u00ed<\/td>\n<\/tr>\n
N55<\/td>\n~55<\/td>\nNejvy\u0161\u0161\u00ed<\/td>\nN\u00edzk\u00e1<\/td>\nVysok\u00e1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Pokud je va\u0161\u00edm jedin\u00fdm c\u00edlem s\u00edla, zvolte N55. Ale pokud pot\u0159ebujete rovnov\u00e1hu, N42 je skv\u011blou volbou.<\/p>\n

Pro\u010d jsou vz\u00e1cn\u00e9 zem\u011b magnety tak siln\u00e9?<\/h2>\n

V\u011bt\u0161ina lid\u00ed nev\u00ed, pro\u010d vz\u00e1cn\u00e9 zeminy magnety tak snadno p\u0159ekon\u00e1vaj\u00ed ostatn\u00ed.<\/p>\n

Magn\u00e9ty neodymiov\u00e9 a samariov\u00e9 pou\u017e\u00edvaj\u00ed prvky jako neodym a samarium, kter\u00e9 maj\u00ed nep\u00e1rov\u00e9 elektrony, je\u017e vytv\u00e1\u0159ej\u00ed siln\u00e1 magnetick\u00e1 pole.<\/strong><\/p>\n

Tajemstv\u00ed spo\u010d\u00edv\u00e1 v atomov\u00e9m chov\u00e1n\u00ed<\/h3>\n

Prvky vz\u00e1cn\u00fdch zemin, zejm\u00e9na neodym, maj\u00ed jedine\u010dn\u00e9 elektronov\u00e9 struktury. Maj\u00ed mnoho nep\u00e1rov\u00fdch elektron\u016f ve sv\u00e9 vn\u011bj\u0161\u00ed vrstv\u011b. To umo\u017e\u0148uje velmi siln\u00e9 magnetick\u00e9 dom\u00e9ny. Kdy\u017e jsou zarovn\u00e1ny, tyto dom\u00e9ny generuj\u00ed vysok\u00fd magnetick\u00fd tok.<\/p>\n

Existuj\u00ed dva hlavn\u00ed typy magnet\u016f vz\u00e1cn\u00fdch zemin:<\/p>\n

    \n
  • Magn\u00e9ty neodymiov\u00e9 (NdFeB)<\/strong>: Nejpevn\u011bj\u0161\u00ed, ale citliv\u00e9 na teplo a korozi.<\/li>\n
  • Magn\u00e9ty samarium-kobalt (SmCo)<\/strong>: Siln\u00e9 a stabiln\u00ed p\u0159i vysok\u00fdch teplot\u00e1ch, ale dra\u017e\u0161\u00ed.<\/li>\n<\/ul>\n\n\n\n\n\n\n
    Magnet vz\u00e1cn\u00fdch zemin<\/th>\nMaxim\u00e1ln\u00ed energie (MGOe)<\/th>\nOdolnost v\u016f\u010di teplot\u00e1m<\/th>\nOdolnost proti korozi<\/th>\n<\/tr>\n<\/thead>\n
    NdFeB<\/td>\nA\u017e 52<\/td>\nN\u00edzk\u00e1<\/td>\nN\u00edzk\u00e1<\/td>\n<\/tr>\n
    SmCo<\/td>\nA\u017e 32<\/td>\nVysok\u00e1<\/td>\nVysok\u00e1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Vid\u011bl jsem, jak mnoho pr\u016fmyslov\u00fdch odv\u011btv\u00ed p\u0159ech\u00e1z\u00ed na magnety vz\u00e1cn\u00fdch zemin, aby sn\u00ed\u017eilo velikost a zv\u00fd\u0161ilo \u00fa\u010dinnost, od motor\u016f po l\u00e9ka\u0159sk\u00e9 n\u00e1stroje.<\/p>\n

    Z\u00e1v\u011br<\/h2>\n

    Magn\u00e9ty neodymiov\u00e9 z\u016fst\u00e1vaj\u00ed nep\u0159ekonan\u00e9 v s\u00edle, co\u017e je \u010din\u00ed nejlep\u0161\u00ed volbou pro magnetick\u00e9 aplikace s vysok\u00fdm v\u00fdkonem.<\/p>","protected":false},"excerpt":{"rendered":"

    Nejsiln\u011bj\u0161\u00ed permanentn\u00ed magnet \u2013 Neodymov\u00fd magnet Magnety jsou v\u0161ude, ale jen m\u00e1lo lid\u00ed v\u00ed, kter\u00fd z nich je skute\u010dn\u011b nejv\u00fdkonn\u011bj\u0161\u00ed. Neodymov\u00e9 magnety jsou nejsiln\u011bj\u0161\u00ed permanentn\u00ed magnety dostupn\u00e9 dnes, p\u0159ekon\u00e1vaj\u00ed v\u0161echny ostatn\u00ed typy jak v magnetick\u00e9 s\u00edle, tak v hustot\u011b energie. Neodymov\u00e9 magnety zm\u011bnily n\u00e1\u0161 pohled na magnetismus [\u2026]<\/p>","protected":false},"author":1,"featured_media":1590,"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-1583","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"jetpack_featured_media_url":"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/05\/Xnip2025-05-12_10-40-53.jpg","_links":{"self":[{"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/posts\/1583","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=1583"}],"version-history":[{"count":7,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/posts\/1583\/revisions"}],"predecessor-version":[{"id":1596,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/posts\/1583\/revisions\/1596"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/media\/1590"}],"wp:attachment":[{"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/media?parent=1583"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/categories?post=1583"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/tags?post=1583"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}