{"id":1597,"date":"2025-05-14T01:56:19","date_gmt":"2025-05-14T01:56:19","guid":{"rendered":"https:\/\/nbaem.com\/?p=1597"},"modified":"2025-09-18T05:03:28","modified_gmt":"2025-09-18T05:03:28","slug":"how-ceramic-magnets-works","status":"publish","type":"post","link":"https:\/\/nbaem.com\/vi\/how-ceramic-magnets-works\/","title":{"rendered":"C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a nam ch\u00e2m ceramic"},"content":{"rendered":"
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Magnets g\u1ed1m l\u00e0 g\u00ec<\/h2>\n

Nam ch\u00e2m g\u1ed1m<\/strong><\/span><\/a>, c\u00f2n g\u1ecdi l\u00e0 nam ch\u00e2m ferrite, l\u00e0 m\u1ed9t lo\u1ea1i nam ch\u00e2m v\u0129nh c\u1eedu ph\u1ed5 bi\u1ebfn \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb oxit s\u1eaft pha tr\u1ed9n v\u1edbi c\u00e1c nguy\u00ean t\u1ed1 kim lo\u1ea1i kh\u00e1c. C\u00e1c v\u1eadt li\u1ec7u ph\u1ed5 bi\u1ebfn nh\u1ea5t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0\u00a0ferrite strontium<\/strong>\u00a0v\u00e0\u00a0ferrite bari<\/strong>. Nh\u1eefng v\u1eadt li\u1ec7u n\u00e0y t\u1ea1o ra \u0111\u1eb7c t\u00ednh t\u1eeb m\u1ea1nh m\u1ebd trong khi gi\u1eef chi ph\u00ed th\u1ea5p, khi\u1ebfn nam ch\u00e2m g\u1ed1m \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u ng\u00e0nh c\u00f4ng nghi\u1ec7p.<\/p>\n

Nam ch\u00e2m g\u1ed1m th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t v\u1edbi nhi\u1ec1u h\u00ecnh d\u1ea1ng kh\u00e1c nhau \u0111\u1ec3 \u0111\u00e1p \u1ee9ng c\u00e1c nhu c\u1ea7u kh\u00e1c nhau, bao g\u1ed3m\u00a0\u0111\u0129a, kh\u1ed1i, v\u00f2ng, v\u00e0 h\u00ecnh tr\u1ee5<\/strong>. S\u1ef1 linh ho\u1ea1t trong thi\u1ebft k\u1ebf n\u00e0y cho ph\u00e9p ch\u00fang ph\u00f9 h\u1ee3p v\u1edbi nhi\u1ec1u \u1ee9ng d\u1ee5ng, t\u1eeb c\u1ea3m bi\u1ebfn nh\u1ecf \u0111\u1ebfn \u0111\u1ed9ng c\u01a1 l\u1edbn. Kh\u1ea3 n\u0103ng duy tr\u00ec s\u1ee9c m\u1ea1nh m\u00e0 kh\u00f4ng c\u1ea7n v\u1eadt li\u1ec7u \u0111\u1eaft ti\u1ec1n khi\u1ebfn ch\u00fang tr\u1edf th\u00e0nh l\u1ef1a ch\u1ecdn \u0111\u00e1ng tin c\u1eady trong nhi\u1ec1u s\u1ea3n ph\u1ea9m h\u00e0ng ng\u00e0y v\u00e0 c\u00f4ng nghi\u1ec7p.<\/p>\n

Nguy\u00ean l\u00fd khoa h\u1ecdc \u0111\u1eb1ng sau nam ch\u00e2m g\u1ed1m<\/h2>\n

 <\/p>\n

Nam ch\u00e2m g\u1ed1m, c\u00f2n g\u1ecdi l\u00e0 nam ch\u00e2m ferrite, ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean c\u00e1ch c\u00e1c v\u00f9ng t\u1eeb nh\u1ecf c\u1ee7a ch\u00fang \u2014 g\u1ecdi l\u00e0 mi\u1ec1n t\u1eeb \u2014 x\u1ebfp h\u00e0ng. Khi c\u00e1c mi\u1ec1n n\u00e0y ch\u1ec9 v\u1ec1 c\u00f9ng m\u1ed9t h\u01b0\u1edbng, nam ch\u00e2m t\u1ea1o ra m\u1ed9t tr\u01b0\u1eddng t\u1eeb. C\u00e1c v\u1eadt li\u1ec7u ch\u00ednh, ferrite strontium v\u00e0 ferrite bari, mang l\u1ea1i s\u1ee9c m\u1ea1nh t\u1eeb cho nam ch\u00e2m g\u1ed1m b\u1eb1ng c\u00e1ch \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1ch c\u00e1c mi\u1ec1n n\u00e0y ho\u1ea1t \u0111\u1ed9ng.<\/p>\n

Hai \u0111\u1eb7c t\u00ednh quan tr\u1ecdng x\u00e1c \u0111\u1ecbnh nam ch\u00e2m g\u1ed1m:<\/p>\n

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  • Kh\u1ea3 n\u0103ng ch\u1ed1ng m\u1ea5t t\u1eeb<\/strong>: \u0110\u00e2y l\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u1ea5t t\u1eeb c\u1ee7a nam ch\u00e2m khi ti\u1ebfp x\u00fac v\u1edbi c\u00e1c tr\u01b0\u1eddng t\u1eeb b\u00ean ngo\u00e0i ho\u1eb7c nhi\u1ec7t \u0111\u1ed9. Nam ch\u00e2m g\u1ed1m c\u00f3 \u0111\u1ed9 c\u01b0\u1ee1ng t\u1eeb cao, v\u00ec v\u1eady ch\u00fang gi\u1eef \u0111\u01b0\u1ee3c s\u1ee9c m\u1ea1nh theo th\u1eddi gian.<\/li>\n
  • \u0110\u1ed9 gi\u1eef t\u1eeb<\/strong>: \u0110o l\u01b0\u1eddng tr\u01b0\u1eddng t\u1eeb c\u00f2n l\u1ea1i c\u1ee7a nam ch\u00e2m sau khi l\u1ef1c t\u1eeb b\u00ean ngo\u00e0i b\u1ecb lo\u1ea1i b\u1ecf. Nam ch\u00e2m g\u1ed1m c\u00f3 \u0111\u1ed9 t\u1eeb d\u01b0 trung b\u00ecnh, ngh\u0129a l\u00e0 ch\u00fang gi\u1eef \u0111\u01b0\u1ee3c t\u1eeb t\u00ednh kh\u00e1 t\u1ed1t nh\u01b0ng kh\u00f4ng m\u1ea1nh b\u1eb1ng m\u1ed9t s\u1ed1 nam ch\u00e2m \u0111\u1ea5t hi\u1ebfm.<\/li>\n<\/ul>\n

    D\u01b0\u1edbi \u0111\u00e2y l\u00e0 so s\u00e1nh nhanh v\u1edbi c\u00e1c lo\u1ea1i nam ch\u00e2m ph\u1ed5 bi\u1ebfn kh\u00e1c:<\/p>\n

    \n\n\n\n\n\n\n\n
    Lo\u1ea1i nam ch\u00e2m<\/th>\n\u0110\u1ed9 c\u01b0\u1ee1ng t\u1eeb (Kh\u00e1ng t\u1eeb m\u1ea5t t\u1eeb)<\/th>\n\u0110\u1ed9 t\u1eeb d\u01b0 (S\u1ee9c m\u1ea1nh t\u1eeb)<\/th>\nC\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng ch\u00ednh<\/th>\n<\/tr>\n<\/thead>\n
    G\u1ed1m (Ferrite)<\/td>\nCao<\/td>\nV\u1eeba ph\u1ea3i<\/td>\n\u0110\u1ed9ng c\u01a1, c\u1ea3m bi\u1ebfn, nam ch\u00e2m loa<\/td>\n<\/tr>\n
    Neodymi<\/td>\nV\u1eeba ph\u1ea3i \u0111\u1ebfn th\u1ea5p<\/td>\nR\u1ea5t cao<\/td>\nThi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed, d\u1ee5ng c\u1ee5 c\u00f3 \u0111\u1ed9 m\u1ea1nh cao<\/td>\n<\/tr>\n
    Alnico<\/td>\nTh\u1ea5p<\/td>\nCao<\/td>\nC\u1ea3m bi\u1ebfn, h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5, b\u1ed9 thu<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    Kh\u00e1c v\u1edbi nam ch\u00e2m neodymium ho\u1eb7c alnico, nam ch\u00e2m g\u1ed1m s\u1ee9 ch\u1ee7 y\u1ebfu l\u1ea5y s\u1ee9c m\u1ea1nh t\u1eeb th\u00e0nh ph\u1ea7n ferrite v\u00e0 s\u1ef1 s\u1eafp x\u1ebfp mi\u1ec1n c\u1ee7a ch\u00fang, kh\u00f4ng ph\u1ea3i t\u1eeb c\u00e1c nguy\u00ean t\u1ed1 \u0111\u1ea5t hi\u1ebfm. \u0110i\u1ec1u n\u00e0y gi\u00fap ch\u00fang c\u00f3 \u0111\u1ed9 b\u1ec1n t\u1ed1t, \u0111\u1eb7c bi\u1ec7t trong m\u00f4i tr\u01b0\u1eddng kh\u1eafc nghi\u1ec7t, nh\u01b0ng v\u1edbi s\u1ee9c m\u1ea1nh t\u1eeb tr\u01b0\u1eddng h\u01a1i th\u1ea5p h\u01a1n.<\/p>\n

    C\u00e1ch Nam ch\u00e2m G\u1ed1m S\u1ee9 T\u1ea1o Ra Tr\u01b0\u1eddng T\u1eeb<\/h2>\n

     <\/p>\n

    Nam ch\u00e2m g\u1ed1m s\u1ee9 t\u1ea1o ra tr\u01b0\u1eddng t\u1eeb th\u00f4ng qua s\u1ef1 s\u1eafp x\u1ebfp c\u1ee7a c\u00e1c v\u00f9ng t\u1eeb nh\u1ecf g\u1ecdi l\u00e0 mi\u1ec1n. B\u00ean trong nam ch\u00e2m, electron c\u00f3 thu\u1ed9c t\u00ednh g\u1ecdi l\u00e0 spin, ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t nam ch\u00e2m nh\u1ecf. Khi nhi\u1ec1u spin electron c\u00f9ng h\u01b0\u1edbng trong c\u00e1c mi\u1ec1n n\u00e0y, hi\u1ec7u \u1ee9ng t\u1eeb c\u1ee7a ch\u00fang c\u1ed9ng l\u1ea1i, t\u1ea1o ra m\u1ed9t tr\u01b0\u1eddng t\u1eeb m\u1ea1nh t\u1ed5ng th\u1ec3.<\/p>\n

    Qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t \u0111\u00f3ng vai tr\u00f2 l\u1edbn trong vi\u1ec7c x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 m\u1ea1nh c\u1ee7a tr\u01b0\u1eddng t\u1eeb n\u00e0y. Sau khi \u0111\u1ecbnh h\u00ecnh nam ch\u00e2m g\u1ed1m s\u1ee9\u2014th\u01b0\u1eddng t\u1eeb c\u00e1c v\u1eadt li\u1ec7u nh\u01b0 ferrite strontium\u2014nam ch\u00e2m s\u1ebd tr\u1ea3i qua b\u01b0\u1edbc magnet h\u00f3a. \u0110i\u1ec1u n\u00e0y bao g\u1ed3m vi\u1ec7c ph\u01a1i n\u00f3 d\u01b0\u1edbi m\u1ed9t tr\u01b0\u1eddng t\u1eeb ngo\u00e0i m\u1ea1nh, bu\u1ed9c h\u1ea7u h\u1ebft c\u00e1c mi\u1ec1n ph\u1ea3i h\u01b0\u1edbng c\u00f9ng m\u1ed9t chi\u1ec1u. S\u1ef1 s\u1eafp x\u1ebfp t\u1ed1t h\u01a1n s\u1ebd l\u00e0m nam ch\u00e2m m\u1ea1nh h\u01a1n v\u00e0 \u1ed5n \u0111\u1ecbnh h\u01a1n.<\/p>\n

    Nam ch\u00e2m g\u1ed1m s\u1ee9 gi\u1eef \u0111\u01b0\u1ee3c t\u1eeb t\u00ednh theo th\u1eddi gian ch\u1ee7 y\u1ebfu nh\u1edd thu\u1ed9c t\u00ednh g\u1ecdi l\u00e0 \u0111\u1ed9 c\u1ea3n t\u1eeb (coercivity). \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 c\u00e1c mi\u1ec1n t\u1eeb ch\u1ed1ng l\u1ea1i s\u1ef1 thay \u0111\u1ed5i ngay c\u1ea3 khi b\u1ecb t\u00e1c \u0111\u1ed9ng b\u1edfi nhi\u1ec7t ho\u1eb7c l\u1ef1c t\u1eeb ngo\u00e0i. \u0110\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao nam ch\u00e2m g\u1ed1m s\u1ee9 ph\u1ed5 bi\u1ebfn trong c\u00e1c \u1ee9ng d\u1ee5ng c\u1ea7n nam ch\u00e2m l\u00e2u d\u00e0i, \u1ed5n \u0111\u1ecbnh m\u00e0 kh\u00f4ng lo gi\u1ea3m s\u1ee9c m\u1ea1nh nhanh.<\/p>\n

    Thu\u1ed9c t\u00ednh v\u00e0 \u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a Nam ch\u00e2m G\u1ed1m S\u1ee9<\/h2>\n

    \"T\u00ednh<\/p>\n

    Nam ch\u00e2m g\u1ed1m s\u1ee9, c\u00f2n g\u1ecdi l\u00e0 nam ch\u00e2m ferrite, cung c\u1ea5p s\u1ee9c m\u1ea1nh t\u1eeb \u1ed5n \u0111\u1ecbnh v\u00e0 \u0111\u00e1ng tin c\u1eady. M\u1eb7c d\u00f9 kh\u00f4ng ph\u1ea3i l\u00e0 lo\u1ea1i nam ch\u00e2m m\u1ea1nh nh\u1ea5t, nh\u01b0ng c\u00e1c \u0111\u1eb7c t\u00ednh t\u1eeb c\u1ee7a ch\u00fang duy tr\u00ec \u1ed5n \u0111\u1ecbnh theo th\u1eddi gian m\u00e0 kh\u00f4ng m\u1ea5t nhi\u1ec1u. \u0110i\u1ec1u n\u00e0y khi\u1ebfn ch\u00fang tr\u1edf th\u00e0nh l\u1ef1a ch\u1ecdn v\u1eefng ch\u1eafc khi hi\u1ec7u su\u1ea5t nh\u1ea5t qu\u00e1n l\u00e0 quan tr\u1ecdng.<\/p>\n

    V\u1ec1 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t, nam ch\u00e2m g\u1ed1m s\u1ee9 x\u1eed l\u00fd nhi\u1ec7t \u0111\u1ed9 trung b\u00ecnh t\u1ed1t, th\u01b0\u1eddng l\u00ean \u0111\u1ebfn kho\u1ea3ng 120\u00b0C (250\u00b0F). V\u01b0\u1ee3t qu\u00e1 m\u1ee9c n\u00e0y, s\u1ee9c m\u1ea1nh t\u1eeb c\u1ee7a ch\u00fang b\u1eaft \u0111\u1ea7u gi\u1ea3m. V\u00ec v\u1eady, ch\u00fang ph\u00f9 h\u1ee3p v\u1edbi m\u00f4i tr\u01b0\u1eddng h\u00e0ng ng\u00e0y nh\u01b0ng kh\u00f4ng l\u00fd t\u01b0\u1edfng cho c\u00e1c \u1ee9ng d\u1ee5ng nhi\u1ec7t \u0111\u1ed9 cao.<\/p>\n

    M\u1ed9t l\u1ee3i th\u1ebf l\u1edbn l\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n xu\u1ea5t s\u1eafc. Kh\u00e1c v\u1edbi m\u1ed9t s\u1ed1 nam ch\u00e2m kim lo\u1ea1i c\u00f3 th\u1ec3 b\u1ecb r\u1ec9 s\u00e9t ho\u1eb7c ph\u00e2n h\u1ee7y, nam ch\u00e2m g\u1ed1m s\u1ee9 t\u1ef1 nhi\u00ean ch\u1ed1ng \u0103n m\u00f2n. \u0110i\u1ec1u n\u00e0y l\u00e0m cho ch\u00fang ph\u00f9 h\u1ee3p cho \u0111i\u1ec1u ki\u1ec7n ngo\u00e0i tr\u1eddi ho\u1eb7c \u1ea9m \u01b0\u1edbt m\u00e0 kh\u00f4ng c\u1ea7n l\u1edbp ph\u1ee7 b\u1ed5 sung.<\/p>\n

    Ng\u01b0\u1ee3c l\u1ea1i, nam ch\u00e2m g\u1ed1m s\u1ee9 c\u1ee9ng v\u1ec1 m\u1eb7t c\u01a1 h\u1ecdc nh\u01b0ng d\u1ec5 v\u1ee1. Ch\u00fang c\u00f3 th\u1ec3 ch\u1ecbu m\u00e0i m\u00f2n \u0111\u1ebfn m\u1ee9c \u0111\u1ed9 nh\u1ea5t \u0111\u1ecbnh, nh\u01b0ng d\u1ec5 b\u1ecb s\u1ee9t m\u1ebb ho\u1eb7c n\u1ee9t n\u1ebfu b\u1ecb r\u01a1i ho\u1eb7c va \u0111\u1eadp m\u1ea1nh. \u0110\u00e2y l\u00e0 \u0111i\u1ec1u c\u1ea7n l\u01b0u \u00fd cho c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u \u0111\u1ed9 b\u1ec1n d\u01b0\u1edbi t\u00e1c \u0111\u1ed9ng.<\/p>\n

    Trong, nam ch\u00e2m g\u1ed1m s\u1ee9 c\u00e2n b\u1eb1ng gi\u1eefa s\u1ee9c m\u1ea1nh t\u1eeb kh\u00e1 t\u1ed1t v\u00e0 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh, kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t t\u1ed1t cho h\u1ea7u h\u1ebft c\u00e1c m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng, kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n cao v\u00e0 \u0111\u1ed9 c\u1ee9ng c\u01a1 h\u1ecdc\u2014nh\u01b0ng c\u1ea7n x\u1eed l\u00fd c\u1ea9n th\u1eadn \u0111\u1ec3 tr\u00e1nh v\u1ee1.<\/p>\n

    C\u00e1c \u1ee8ng d\u1ee5ng Ph\u1ed5 bi\u1ebfn c\u1ee7a Nam ch\u00e2m G\u1ed1m S\u1ee9<\/h2>\n

    Nam ch\u00e2m g\u1ed1m s\u1ee9 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i nh\u1edd v\u00e0o s\u1ee9c m\u1ea1nh t\u1eeb \u1ed5n \u0111\u1ecbnh v\u00e0 \u0111\u1ed9 b\u1ec1n c\u1ee7a ch\u00fang. Trong ng\u00e0nh c\u00f4ng nghi\u1ec7p, b\u1ea1n th\u01b0\u1eddng th\u1ea5y ch\u00fang trong \u0111\u1ed9ng c\u01a1, c\u1ea3m bi\u1ebfn v\u00e0 loa. Kh\u1ea3 n\u0103ng duy tr\u00ec t\u1eeb t\u00ednh d\u01b0\u1edbi nhi\u1ec7t v\u00e0 \u0103n m\u00f2n khi\u1ebfn ch\u00fang l\u00fd t\u01b0\u1edfng cho c\u00e1c m\u00f4i tr\u01b0\u1eddng \u0111\u00f2i h\u1ecfi n\u00e0y.<\/p>\n

    Trong c\u00e1c s\u1ea3n ph\u1ea9m ti\u00eau d\u00f9ng h\u00e0ng ng\u00e0y, nam ch\u00e2m g\u1ed1m s\u1ee9 xu\u1ea5t hi\u1ec7n trong nam ch\u00e2m t\u1ee7 l\u1ea1nh, d\u1ee5ng c\u1ee5 t\u1eeb v\u00e0 th\u1eadm ch\u00ed m\u1ed9t s\u1ed1 lo\u1ea1i gi\u00e1 \u0111\u1ee1 t\u1eeb. Ch\u00fang ti\u1ebft ki\u1ec7m chi ph\u00ed v\u00e0 c\u00f3 tu\u1ed5i th\u1ecd cao, \u0111\u00f3 l\u00e0 l\u00fd do ch\u00fang \u0111\u01b0\u1ee3c \u01b0a chu\u1ed9ng trong s\u1eed d\u1ee5ng gia \u0111\u00ecnh.<\/p>\n

    \u01afu \u0111i\u1ec3m v\u00e0 H\u1ea1n ch\u1ebf c\u1ee7a Nam ch\u00e2m G\u1ed1m S\u1ee9<\/h2>\n

    Nam ch\u00e2m g\u1ed1m s\u1ee9 mang l\u1ea1i nhi\u1ec1u l\u1ee3i \u00edch khi\u1ebfn ch\u00fang ph\u1ed5 bi\u1ebfn trong c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p kh\u00e1c nhau. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 nh\u1eefng \u0111i\u1ec3m n\u1ed5i b\u1eadt:<\/p>\n

    \u01afu \u0111i\u1ec3m<\/h3>\n

    Ti\u1ebft ki\u1ec7m chi ph\u00ed: L\u00e0m t\u1eeb c\u00e1c v\u1eadt li\u1ec7u gi\u00e1 r\u1ebb nh\u01b0 ferrite strontium v\u00e0 ferrite bari, nam ch\u00e2m g\u1ed1m s\u1ee9 ph\u00f9 h\u1ee3p t\u00fai ti\u1ec1n so v\u1edbi nam ch\u00e2m \u0111\u1ea5t hi\u1ebfm.
    \nCh\u1ed1ng \u0103n m\u00f2n: Ch\u00fang ch\u1ed1ng l\u1ea1i \u0111\u1ed9 \u1ea9m v\u00e0 r\u1ec9 s\u00e9t t\u1ed1t m\u00e0 kh\u00f4ng c\u1ea7n l\u1edbp ph\u1ee7 b\u1ed5 sung, ph\u00f9 h\u1ee3p cho s\u1eed d\u1ee5ng l\u00e2u d\u00e0i.
    \nS\u1ee9c m\u1ea1nh t\u1eeb t\u1ed1t: M\u1eb7c d\u00f9 kh\u00f4ng ph\u1ea3i lo\u1ea1i nam ch\u00e2m m\u1ea1nh nh\u1ea5t, nh\u01b0ng nam ch\u00e2m g\u1ed1m s\u1ee9 cung c\u1ea5p s\u1ee9c m\u1ea1nh t\u1eeb \u0111\u00e1ng tin c\u1eady ph\u00f9 h\u1ee3p v\u1edbi nhi\u1ec1u \u1ee9ng d\u1ee5ng h\u00e0ng ng\u00e0y.<\/p>\n

    Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/p>\n

    N\u1eb7ng h\u01a1n: Nam ch\u00e2m g\u1ed1m s\u1ee9 c\u00f3 xu h\u01b0\u1edbng d\u00e0y \u0111\u1eb7c h\u01a1n, g\u00e2y tr\u1ecdng l\u01b0\u1ee3ng l\u1edbn h\u01a1n so v\u1edbi c\u00e1c l\u1ef1a ch\u1ecdn nh\u1eb9 nh\u01b0 nam ch\u00e2m neodymium.
    \nGi\u00f2n: Ch\u00fang c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng v\u1ee1 ho\u1eb7c m\u1ebb n\u1ebfu b\u1ecb r\u01a1i ho\u1eb7c ch\u1ecbu t\u00e1c \u0111\u1ed9ng do t\u00ednh ch\u1ea5t g\u1ed1m c\u1ee7a ch\u00fang.
    \nC\u01b0\u1eddng \u0111\u1ed9 t\u1eeb y\u1ebfu h\u01a1n: So v\u1edbi nam ch\u00e2m \u0111\u1ea5t hi\u1ebfm nh\u01b0 neodymium, nam ch\u00e2m g\u1ed1m t\u1ea1o ra tr\u01b0\u1eddng t\u1eeb y\u1ebfu h\u01a1n, h\u1ea1n ch\u1ebf s\u1eed d\u1ee5ng trong c\u00e1c m\u00f4i tr\u01b0\u1eddng hi\u1ec7u su\u1ea5t cao.<\/p>\n

    H\u01b0\u1edbng d\u1eabn ph\u00f9 h\u1ee3p<\/p>\n

    Nam ch\u00e2m g\u1ed1m ho\u1ea1t \u0111\u1ed9ng t\u1ed1t nh\u1ea5t khi b\u1ea1n c\u1ea7n kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n m\u1ea1nh v\u00e0 t\u00ednh ch\u1ea5t t\u1eeb \u1ed5n \u0111\u1ecbnh m\u00e0 kh\u00f4ng c\u1ea7n chi ph\u00ed qu\u00e1 cao. Ch\u00fang l\u00fd t\u01b0\u1edfng cho:<\/p>\n

      \n
    • \u0110\u1ed9ng c\u01a1 c\u00f4ng nghi\u1ec7p v\u00e0 c\u1ea3m bi\u1ebfn n\u01a1i \u0111\u1ed9 b\u1ec1n l\u00e0 y\u1ebfu t\u1ed1 quan tr\u1ecdng<\/li>\n
    • C\u00e1c v\u1eadt d\u1ee5ng gia \u0111\u00ecnh nh\u01b0 nam ch\u00e2m t\u1ee7 l\u1ea1nh v\u00e0 d\u1ee5ng c\u1ee5 t\u1eeb<\/li>\n
    • C\u00e1c \u1ee9ng d\u1ee5ng m\u00e0 tr\u1ecdng l\u01b0\u1ee3ng \u00edt quan tr\u1ecdng h\u01a1n nh\u01b0ng chi ph\u00ed v\u00e0 tu\u1ed5i th\u1ecd l\u00e0 \u01b0u ti\u00ean h\u00e0ng \u0111\u1ea7u<\/li>\n<\/ul>\n

      \u0110\u1ed1i v\u1edbi c\u00e1c d\u1ef1 \u00e1n y\u00eau c\u1ea7u tr\u01b0\u1eddng t\u1eeb c\u1ef1c m\u1ea1nh ho\u1eb7c v\u1eadt li\u1ec7u nh\u1eb9, b\u1ea1n c\u00f3 th\u1ec3 xem x\u00e9t c\u00e1c l\u1ef1a ch\u1ecdn \u0111\u1ea5t hi\u1ebfm thay th\u1ebf. Nh\u01b0ng \u0111\u1ec3 c\u00f3 t\u1eeb t\u00ednh \u1ed5n \u0111\u1ecbnh, \u0111\u00e1ng tin c\u1eady v\u00e0 ti\u1ebft ki\u1ec7m chi ph\u00ed, nam ch\u00e2m g\u1ed1m v\u1eabn l\u00e0 l\u1ef1a ch\u1ecdn v\u1eefng ch\u1eafc tr\u00ean th\u1ecb tr\u01b0\u1eddng.<\/p>\n<\/div>\n<\/div>\n