{"id":3766,"date":"2026-04-01T07:01:25","date_gmt":"2026-04-01T07:01:25","guid":{"rendered":"https:\/\/nbaem.com\/?p=3766"},"modified":"2026-03-30T07:43:56","modified_gmt":"2026-03-30T07:43:56","slug":"ndfeb-magnets-uh-grade","status":"publish","type":"post","link":"https:\/\/nbaem.com\/cs\/ndfeb-magnets-uh-grade\/","title":{"rendered":"NdFeB magnety UH t\u0159\u00edda pr\u016fvodce specifikace vysokoteplotn\u00ed v\u00fdkon"},"content":{"rendered":"

Mo\u017en\u00e1 u\u017e v\u00edte, \u017ee therm\u00e1ln\u00ed demagnetizace je nejv\u011bt\u0161\u00ed hrozba pro vysoce v\u00fdkonn\u00e9 in\u017een\u00fdrstv\u00ed\u2026<\/p>\n

Ale jak j\u00ed p\u0159edch\u00e1zet, ani\u017e byste zbyte\u010dn\u011b utr\u00e1celi za materi\u00e1ly?<\/p>\n

No, m\u00e1te tu lah\u016fdku, proto\u017ee jsem p\u0159ipravil kompletn\u00ed p\u0159\u00edru\u010dku pro in\u017een\u00fdry NdFeB magnety (UH t\u0159\u00edda)<\/strong>.<\/p>\n

Jako odborn\u00edk na magnetick\u00e1 \u0159e\u0161en\u00ed v\u00edm, \u017ee spr\u00e1vn\u00e9 specifikov\u00e1n\u00ed sinetovan\u00fdch neodymov\u00fdch magnet\u016f<\/strong> je kl\u00ed\u010dov\u00e9 pro \u00fasp\u011bch vysoce teplotn\u00edch aplikac\u00ed, jako jsou motor\u016f EV s vysokou rychlost\u00ed, kosmick\u00e9 komponenty a pr\u016fmyslov\u00e9 senzory.<\/p>\n

V tomto p\u0159\u00edsp\u011bvku se p\u0159esn\u011b nau\u010d\u00edte, jak vyhodnotit Ultra High intrinsic koercivita<\/a> (Hci)<\/strong> a proj\u00edt p\u0159\u00edsn\u00fdm limitem maxim\u00e1ln\u00ed provozn\u00ed teploty 180 \u00b0C<\/strong> bez sn\u00ed\u017een\u00ed celkov\u00e9 magnetick\u00e9 s\u00edly.<\/p>\n

A\u0165 u\u017e se sna\u017e\u00edte vyv\u00e1\u017eit n\u00e1klady a v\u00fdkon nebo hled\u00e1te optimalizovat va\u0161i dal\u0161\u00ed zak\u00e1zkovou magnetickou soustavu, tato p\u0159\u00edru\u010dka je pro v\u00e1s.<\/p>\n

Poj\u010fme se rovnou pustit do toho.<\/p>\n

Ztr\u00e1cej\u00ed va\u0161e trval\u00e9 magnety s\u00edlu v prost\u0159ed\u00edch s vysok\u00fdmi teplotami? P\u0159i n\u00e1vrhu t\u011b\u017ek\u00fdch motor\u016f nebo senzor\u016f, kter\u00e9 tla\u010d\u00ed tepeln\u00e1 omezen\u00ed, standardn\u00ed sinterovan\u00e9 neodymov\u00e9 magnety se nevyhnuteln\u011b zhor\u0161\u00ed. Pot\u0159ebujete \u0159e\u0161en\u00ed navr\u017een\u00e9 pro vynikaj\u00edc\u00ed odolnost v\u016f\u010di demagnetizaci p\u0159i vysok\u00e9 teplot\u011b. Nechte m\u011b p\u0159esn\u011b vysv\u011btlit, co d\u011bl\u00e1 NdFeB magnety (UH t\u0159\u00edda)<\/strong> definitivn\u00ed volbu pro extr\u00e9mn\u00ed podm\u00ednky.<\/p>\n

Dek\u00f3dov\u00e1n\u00ed specifikac\u00ed magnet\u016f NdFeB (UH t\u0159\u00edda)<\/h2>\n

Rozbor stup\u0148\u016f magnet\u016f NdFeB<\/h3>\n

Pochopen\u00ed n\u00e1zvov\u00e9ho syst\u00e9mu vz\u00e1cn\u00fdch zemin pro trval\u00e9 magnety je va\u0161\u00edm prvn\u00edm krokem k efektivn\u00ed optimalizaci magnetick\u00e9ho obvodu. Pod\u00edvejme se na anatomii standardn\u00ed formulace t\u0159\u00eddy, nap\u0159\u00edklad N42UH<\/strong>:<\/p>\n\n\n\n\n\n\n\n
N\u00e1zev prvku<\/th>\nTechnick\u00fd v\u00fdznam<\/th>\nPraktick\u00e9 pou\u017eit\u00ed<\/th>\n<\/tr>\n<\/thead>\n
N<\/strong><\/td>\nNeodym (NdFeB)<\/td>\nIdentifikuje z\u00e1kladn\u00ed materi\u00e1l jako sinterovan\u00e9 neodymov\u00e9 magnety.<\/td>\n<\/tr>\n
42<\/strong><\/td>\nMaxim\u00e1ln\u00ed energetick\u00fd produkt (BHmax)<\/td>\nP\u0159edstavuje celkovou s\u00edlu magnetick\u00e9ho pole (nap\u0159. 42 MGOe).<\/td>\n<\/tr>\n
UH<\/strong><\/td>\nTeplotn\u00ed hodnocen\u00ed<\/td>\nNazna\u010duje klasifikaci \u201eUltra High\u201c odolnosti v\u016f\u010di teplot\u011b.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Ultra High Vnit\u0159n\u00ed Koercivita (Hci)<\/h3>\n

Abychom zabr\u00e1nili nevratn\u00e9 demagnetizaci v poli, magnety t\u0159\u00eddy UH vy\u017eaduj\u00ed v\u00fdjime\u010dnou koercivitu. Navrhujeme tyto magnety tak, aby spl\u0148ovaly p\u0159\u00edsn\u00e9 Po\u017eadavky na vnit\u0159n\u00ed koercivitu (Hci) \u2265 25 000 Oe<\/strong>. N\u00e1vrh s touto t\u0159\u00eddou vy\u017eaduje p\u0159esnou rovnov\u00e1hu: mus\u00edme maximalizovat Remanenci (Br) a Maxim\u00e1ln\u00ed produkt energie (BHmax) bez ob\u011btov\u00e1n\u00ed vysok\u00e9 koercivity pot\u0159ebn\u00e9 k p\u0159e\u017eit\u00ed v nep\u0159\u00edzniv\u00fdch pr\u016fmyslov\u00fdch prost\u0159ed\u00edch.<\/p>\n

Maxim\u00e1ln\u00ed provozn\u00ed teplota 180 \u00b0C<\/h3>\n

Ozna\u010den\u00ed \u201eUH\u201c zaru\u010duje limitem maxim\u00e1ln\u00ed provozn\u00ed teploty 180 \u00b0C<\/strong>, av\u0161ak to nen\u00ed pln\u011b plug-and-play metrika. Skute\u010dn\u00fd v\u00fdkon v prost\u0159ed\u00ed z\u00e1vis\u00ed v\u00fdrazn\u011b na tom, jak je magnet integrov\u00e1n do va\u0161eho syst\u00e9mu. Aby nedo\u0161lo k selh\u00e1n\u00ed p\u0159i \u0161pi\u010dkov\u00e9m zah\u0159\u00e1t\u00ed, mus\u00edte vz\u00edt v \u00favahu:<\/p>\n