{"id":1855,"date":"2025-08-11T02:42:21","date_gmt":"2025-08-11T02:42:21","guid":{"rendered":"https:\/\/nbaem.com\/?p=1855"},"modified":"2025-08-11T04:15:51","modified_gmt":"2025-08-11T04:15:51","slug":"what-is-bar-magnet","status":"publish","type":"post","link":"https:\/\/nbaem.com\/vi\/what-is-bar-magnet\/","title":{"rendered":"Nam ch\u00e2m thanh bar l\u00e0 g\u00ec"},"content":{"rendered":"<p>B\u1ea1n c\u00f3 t\u00f2 m\u00f2 v\u1ec1 <strong>nam ch\u00e2m thanh l\u00e0 g\u00ec<\/strong> v\u00e0 t\u1ea1i sao n\u00f3 l\u1ea1i quan tr\u1ecdng trong c\u1ea3 \u0111\u1eddi s\u1ed1ng h\u00e0ng ng\u00e0y v\u00e0 c\u00f4ng nghi\u1ec7p? D\u00f9 b\u1ea1n l\u00e0 h\u1ecdc sinh c\u1ed1 g\u1eafng hi\u1ec3u c\u00e1c kh\u00e1i ni\u1ec7m v\u1eadt l\u00fd c\u01a1 b\u1ea3n hay l\u00e0 chuy\u00ean gia mu\u1ed1n hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 v\u1eadt li\u1ec7u t\u1eeb, h\u01b0\u1edbng d\u1eabn n\u00e0y d\u00e0nh cho b\u1ea1n. Nam ch\u00e2m thanh l\u00e0 m\u1ed9t trong nh\u1eefng lo\u1ea1i nam ch\u00e2m v\u0129nh c\u1eedu \u0111\u01a1n gi\u1ea3n nh\u01b0ng h\u1ea5p d\u1eabn nh\u1ea5t, \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng t\u1eeb c\u00e1c th\u00ed nghi\u1ec7m trong l\u1edbp h\u1ecdc \u0111\u1ebfn c\u00e1c quy tr\u00ecnh s\u1ea3n xu\u1ea5t ti\u00ean ti\u1ebfn.<\/p>\n<p>Trong blog n\u00e0y, b\u1ea1n s\u1ebd kh\u00e1m ph\u00e1 m\u1ed9t gi\u1ea3i th\u00edch r\u00f5 r\u00e0ng v\u1ec1 <strong>nam ch\u00e2m thanh<\/strong>, c\u00e1c \u0111\u1eb7c t\u00ednh \u0111\u1ed9c \u0111\u00e1o c\u1ee7a ch\u00fang, c\u00e1ch ch\u00fang ho\u1ea1t \u0111\u1ed9ng, v\u00e0 nhi\u1ec1u \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a ch\u00fang. Th\u00eam v\u00e0o \u0111\u00f3, v\u1edbi vai tr\u00f2 l\u00e0 m\u1ed9t chuy\u00ean gia \u0111\u00e1ng tin c\u1eady v\u1ec1 v\u1eadt li\u1ec7u t\u1eeb, NBAEM s\u1ebd cho b\u1ea1n th\u1ea5y t\u1ea1i sao vi\u1ec7c hi\u1ec3u bi\u1ebft v\u1ec1 c\u00e1c nam ch\u00e2m n\u00e0y l\u1ea1i quan tr\u1ecdng\u2014v\u00e0 c\u00e1ch c\u00e1c s\u1ea3n ph\u1ea9m ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a ch\u00fang t\u00f4i c\u00f3 th\u1ec3 \u0111\u00e1p \u1ee9ng nhu c\u1ea7u c\u1ee7a b\u1ea1n. S\u1eb5n s\u00e0ng kh\u00e1m ph\u00e1 th\u1ebf gi\u1edbi t\u1eeb tr\u01b0\u1eddng ch\u01b0a? H\u00e3y b\u1eaft \u0111\u1ea7u n\u00e0o!<\/p>\n<h2><img decoding=\"async\" class=\"alignnone  wp-image-1495\" src=\"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/03\/60ff697a1bf06.png\" alt=\"\" width=\"477\" height=\"477\" srcset=\"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/03\/60ff697a1bf06-66x66.png 66w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/03\/60ff697a1bf06-150x150.png 150w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/03\/60ff697a1bf06-200x200.png 200w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/03\/60ff697a1bf06-300x300.png 300w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/03\/60ff697a1bf06-400x400.png 400w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/03\/60ff697a1bf06-600x600.png 600w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/03\/60ff697a1bf06.png 635w\" sizes=\"(max-width: 477px) 100vw, 477px\" \/><\/h2>\n<h2>H\u1ea1t nam ch\u00e2m h\u00ecnh thanh l\u00e0 g\u00ec<\/h2>\n<p><strong>Nam ch\u00e2m h\u00ecnh thanh l\u00e0 m\u1ed9t nam ch\u00e2m v\u0129nh c\u1eedu th\u1eb3ng, h\u00ecnh ch\u1eef nh\u1eadt, t\u1ea1o ra m\u1ed9t tr\u01b0\u1eddng t\u1eeb \u1ed5n \u0111\u1ecbnh xung quanh n\u00f3. T\u00f4i ngh\u0129 n\u00f3 nh\u01b0 m\u1ed9t nam ch\u00e2m \u0111\u01a1n gi\u1ea3n, ti\u1ec7n l\u1ee3i m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 c\u1ea7m trong m\u1ed9t tay \u2014 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong l\u1edbp h\u1ecdc, ph\u00f2ng th\u00ed nghi\u1ec7m v\u00e0 nhi\u1ec1u m\u00f4i tr\u01b0\u1eddng c\u00f4ng nghi\u1ec7p \u0111\u1ec3 tr\u00ecnh di\u1ec5n v\u00e0 ch\u1ee9ng minh c\u00e1c hi\u1ec7u \u1ee9ng t\u1eeb c\u01a1 b\u1ea3n.<\/strong><\/p>\n<h3>\u0110\u1eb7c \u0111i\u1ec3m v\u1eadt l\u00fd<\/h3>\n<ul>\n<li>H\u00ecnh d\u1ea1ng v\u00e0 k\u00edch th\u01b0\u1edbc\n<ul>\n<li>Th\u00f4ng th\u01b0\u1eddng l\u00e0 m\u1ed9t kh\u1ed1i ho\u1eb7c h\u00ecnh l\u0103ng tr\u1ee5 d\u00e0i h\u00ecnh ch\u1eef nh\u1eadt.<\/li>\n<li>K\u00edch th\u01b0\u1edbc dao \u0111\u1ed9ng t\u1eeb v\u00e0i milimet (nam ch\u00e2m ph\u00f2ng th\u00ed nghi\u1ec7m nh\u1ecf) \u0111\u1ebfn v\u00e0i inch ho\u1eb7c d\u00e0i h\u01a1n cho c\u00e1c thanh c\u00f4ng nghi\u1ec7p.<\/li>\n<li>S\u1ef1 t\u1eeb h\u00f3a th\u01b0\u1eddng theo chi\u1ec1u d\u00e0i c\u1ee7a thanh, v\u00ec v\u1eady hai \u0111\u1ea7u \u0111\u00f3ng vai tr\u00f2 l\u00e0 c\u00e1c c\u1ef1c ch\u00ednh.<\/li>\n<\/ul>\n<\/li>\n<li>Th\u00e0nh ph\u1ea7n\n<ul>\n<li>\u0110\u01b0\u1ee3c l\u00e0m t\u1eeb c\u00e1c v\u1eadt li\u1ec7u ferromagnetic th\u01b0\u1eddng \u0111\u01b0\u1ee3c t\u1eeb h\u00f3a v\u00e0 gi\u1eef t\u1eeb t\u00ednh:\n<ul>\n<li>Alnico (nh\u00f4m, niken, coban)<\/li>\n<li>G\u1ed1m (s\u1ee9)<br \/>\nh\u1ee3p kim \u0111\u1ea5t hi\u1ebfm nh\u01b0 neodymium (NdFeB)<\/li>\n<li>Th\u00e9p ho\u1eb7c s\u1eaft c\u1ee9ng trong c\u00e1c thanh c\u0169 ho\u1eb7c \u0111\u1eb7c bi\u1ec7t<\/li>\n<\/ul>\n<\/li>\n<li>L\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 m\u1ea1nh, kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t v\u00e0 chi ph\u00ed.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>C\u00e1ch c\u00e1c nam ch\u00e2m h\u00ecnh thanh t\u1ea1o ra tr\u01b0\u1eddng t\u1eeb tr\u01b0\u1eddng<\/h3>\n<p>Tr\u01b0\u1eddng t\u1eeb c\u1ee7a nam ch\u00e2m h\u00ecnh thanh xu\u1ea5t ph\u00e1t t\u1eeb s\u1ef1 s\u1eafp x\u1ebfp c\u1ee7a c\u00e1c moment t\u1eeb vi m\u00f4 b\u00ean trong v\u1eadt li\u1ec7u. C\u00e1c nguy\u00ean t\u1eed c\u00f3 c\u00e1c moment t\u1eeb nh\u1ecf b\u00e9 do spin electron v\u00e0 chuy\u1ec3n \u0111\u1ed9ng qu\u1ef9 \u0111\u1ea1o t\u1ea1o ra. Trong c\u00e1c v\u1eadt li\u1ec7u ferromagnetic, c\u00e1c moment n\u00e0y t\u1eadp h\u1ee3p th\u00e0nh c\u00e1c v\u00f9ng g\u1ecdi l\u00e0 mi\u1ec1n. Khi ph\u1ea7n l\u1edbn c\u00e1c mi\u1ec1n h\u01b0\u1edbng c\u00f9ng m\u1ed9t chi\u1ec1u, tr\u01b0\u1eddng c\u1ee7a ch\u00fang c\u1ed9ng l\u1ea1i v\u00e0 thanh t\u1ea1o ra m\u1ed9t tr\u01b0\u1eddng t\u1eeb m\u1ea1nh, r\u00f5 r\u00e0ng. B\u1ea1n c\u00f3 th\u1ec3 h\u00ecnh dung nh\u01b0 nhi\u1ec1u kim ch\u1ec9 nam nh\u1ecf x\u00edu \u0111\u1ec1u x\u1ebfp h\u00e0ng trong thanh.<\/p>\n<h3>C\u00e1c c\u1ef1c t\u1eeb B\u1eafc v\u00e0 Nam<\/h3>\n<ul>\n<li>M\u1ed7i nam ch\u00e2m h\u00ecnh thanh c\u00f3 c\u00e1c c\u1ef1c: B\u1eafc (N) v\u00e0 Nam (S).<\/li>\n<li>C\u00e1c \u0111\u01b0\u1eddng t\u1eeb tr\u01b0\u1eddng r\u1eddi kh\u1ecfi c\u1ef1c B\u1eafc v\u00e0 \u0111i v\u00e0o c\u1ef1c Nam, t\u1ea1o th\u00e0nh m\u1ed9t v\u00f2ng qua kh\u00f4ng gian v\u00e0 tr\u1edf l\u1ea1i qua b\u00ean trong nam ch\u00e2m.<\/li>\n<li>Tr\u01b0\u1eddng t\u1eeb m\u1ea1nh nh\u1ea5t g\u1ea7n c\u00e1c c\u1ef1c, \u0111\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao nam ch\u00e2m h\u00ecnh thanh h\u00fat c\u00e1c v\u1eadt s\u1eaft hi\u1ec7u qu\u1ea3 nh\u1ea5t t\u1ea1i c\u00e1c c\u1ef1c c\u1ee7a n\u00f3.<\/li>\n<li>N\u1ebfu b\u1ea1n c\u1eaft m\u1ed9t nam ch\u00e2m h\u00ecnh thanh th\u00e0nh hai, m\u1ed7i ph\u1ea7n tr\u1edf th\u00e0nh m\u1ed9t nam ch\u00e2m nh\u1ecf h\u01a1n v\u1edbi c\u1ef1c B\u1eafc v\u00e0 c\u1ef1c Nam ri\u00eang c\u1ee7a n\u00f3 \u2014 b\u1ea1n kh\u00f4ng bao gi\u1edd thu \u0111\u01b0\u1ee3c m\u1ed9t c\u1ef1c \u0111\u01a1n l\u1ebb.<\/li>\n<\/ul>\n<h2>Thu\u1ed9c t\u00ednh c\u1ee7a nam ch\u00e2m h\u00ecnh thanh<\/h2>\n<h3>Tr\u01b0\u1eddng t\u1eeb v\u00e0 c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb<\/h3>\n<p>Nam ch\u00e2m h\u00ecnh thanh t\u1ea1o ra m\u1ed9t tr\u01b0\u1eddng t\u1eeb xung quanh n\u00f3. T\u00f4i m\u00f4 t\u1ea3 \u0111\u01a1n gi\u1ea3n: c\u00e1c \u0111\u01b0\u1eddng tr\u01b0\u1eddng ch\u1ea3y t\u1eeb c\u1ef1c B\u1eafc c\u1ee7a nam ch\u00e2m \u0111\u1ebfn c\u1ef1c Nam c\u1ee7a n\u00f3 b\u00ean ngo\u00e0i nam ch\u00e2m v\u00e0 tr\u1edf l\u1ea1i qua b\u00ean trong nam ch\u00e2m.<\/p>\n<ul>\n<li><strong>Tr\u01b0\u1eddng m\u1ea1nh nh\u1ea5t t\u1ea1i c\u00e1c c\u1ef1c.<\/strong> \u0110\u00f3 l\u00e0 n\u01a1i kim nam ch\u00e2m ph\u1ea3n \u1ee9ng m\u1ea1nh nh\u1ea5t.<\/li>\n<li>B\u1ea1n c\u00f3 th\u1ec3 h\u00ecnh dung c\u00e1c \u0111\u01b0\u1eddng t\u1eeb b\u1eb1ng c\u00e1ch d\u00f9ng v\u1ee5n s\u1eaft ho\u1eb7c la b\u00e0n \u2014 ch\u00fang cho th\u1ea5y r\u00f5 tr\u01b0\u1eddng t\u1eeb c\u1ee7a m\u1ed9t nam ch\u00e2m th\u1eb3ng.<\/li>\n<\/ul>\n<h3>H\u00e0nh vi h\u00fat v\u00e0 \u0111\u1ea9y<\/h3>\n<p>Nam ch\u00e2m th\u1eb3ng tu\u00e2n theo quy t\u1eafc c\u01a1 b\u1ea3n: <strong>\u0111\u1ea7u c\u00f9ng c\u1ef1c gi\u1ed1ng nhau \u0111\u1ea9y nhau, kh\u00e1c nhau h\u00fat nhau<\/strong>.<\/p>\n<ul>\n<li>C\u00e1c c\u1ef1c \u0111\u1ed1i di\u1ec7n (B\u1eafc v\u00e0 Nam) k\u00e9o nhau l\u1ea1i.<\/li>\n<li>C\u00e1c c\u1ef1c c\u00f9ng lo\u1ea1i (B\u1eafc\u2013B\u1eafc ho\u1eb7c Nam\u2013Nam) \u0111\u1ea9y nhau ra.<\/li>\n<li>Khi m\u1ed9t nam ch\u00e2m th\u1eb3ng g\u1eb7p c\u00e1c v\u1eadt li\u1ec7u ferromagnetic (s\u1eaft, niken, coban), n\u00f3 h\u00fat v\u00e0 c\u00f3 th\u1ec3 g\u00e2y ra t\u1eeb t\u00ednh t\u1ea1m th\u1eddi trong ch\u00fang \u2014 \u0111\u00f3 l\u00e0 l\u00fd do v\u00ec sao k\u1eb9p gi\u1ea5y d\u00ednh v\u00e0o.<\/li>\n<\/ul>\n<h3>\u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a nam ch\u00e2m v\u0129nh c\u1eedu so v\u1edbi nam ch\u00e2m t\u1ea1m th\u1eddi<\/h3>\n<p>H\u1ea7u h\u1ebft c\u00e1c nam ch\u00e2m th\u1eb3ng l\u00e0 <strong>nam ch\u00e2m v\u0129nh c\u1eedu<\/strong>, ngh\u0129a l\u00e0 ch\u00fang gi\u1eef t\u1eeb t\u00ednh c\u1ee7a m\u00ecnh m\u00e0 kh\u00f4ng c\u1ea7n ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng. T\u00f4i s\u1ebd l\u00e0m r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t:<\/p>\n<ul>\n<li>Nam ch\u00e2m v\u0129nh c\u1eedu (v\u00ed d\u1ee5, neodymium, ferrite, Alnico) gi\u1eef tr\u01b0\u1eddng t\u1eeb l\u00e2u d\u00e0i.<\/li>\n<li>Nam ch\u00e2m t\u1ea1m th\u1eddi (c\u00e1c m\u1ea3nh s\u1eaft m\u1ec1m) ch\u1ec9 tr\u1edf th\u00e0nh t\u1eeb khi g\u1ea7n nam ch\u00e2m ho\u1eb7c d\u00f2ng \u0111i\u1ec7n v\u00e0 m\u1ea5t \u0111i nhanh ch\u00f3ng.<\/li>\n<li>Nam ch\u00e2m v\u0129nh c\u1eedu c\u00f3 <strong>kh\u00e1ng t\u1eeb<\/strong> (kh\u00e1ng l\u1ea1i qu\u00e1 tr\u00ecnh m\u1ea5t t\u1eeb); c\u00e1c v\u1eadt li\u1ec7u c\u00f3 kh\u00e1ng t\u1eeb cao gi\u1eef tr\u01b0\u1eddng t\u1ed1t h\u01a1n.<\/li>\n<\/ul>\n<h3>C\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u01b0\u1eddng \u0111\u1ed9 t\u1eeb tr\u01b0\u1eddng<\/h3>\n<p>\u0110\u1ed9 m\u1ea1nh t\u1eeb c\u1ee7a m\u1ed9t nam ch\u00e2m th\u1eb3ng ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec1u y\u1ebfu t\u1ed1 th\u1ef1c t\u1ebf:<\/p>\n<table>\n<thead>\n<tr>\n<th>Y\u1ebfu t\u1ed1<\/th>\n<th>\u1ea2nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 m\u1ea1nh<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Th\u00e0nh ph\u1ea7n v\u1eadt li\u1ec7u<\/td>\n<td>NdFeB (neodymium) = r\u1ea5t m\u1ea1nh, Alnico = ph\u00f9 h\u1ee3p nhi\u1ec7t \u0111\u1ed9 cao, ferrite = \u0111\u1ed9 m\u1ea1nh th\u1ea5p h\u01a1n nh\u01b0ng r\u1ebb h\u01a1n<\/td>\n<\/tr>\n<tr>\n<td>K\u00edch th\u01b0\u1edbc v\u00e0 h\u00ecnh d\u1ea1ng<\/td>\n<td>Th\u1ec3 t\u00edch l\u1edbn h\u01a1n ho\u1eb7c di\u1ec7n t\u00edch c\u1ef1c c\u1ee7a c\u1ef1c l\u1edbn h\u01a1n th\u01b0\u1eddng c\u00f3 ngh\u0129a l\u00e0 l\u1ef1c h\u00fat m\u1ea1nh h\u01a1n; chi\u1ec1u d\u00e0i d\u00e0i h\u01a1n c\u00f3 th\u1ec3 ph\u00e2n t\u00e1n tr\u01b0\u1eddng<\/td>\n<\/tr>\n<tr>\n<td>Qu\u00e1 tr\u00ecnh t\u1eeb tr\u01b0\u1eddng<\/td>\n<td>C\u00e1ch n\u00f3 \u0111\u01b0\u1ee3c t\u1eeb h\u00f3a (m\u1ee9c \u0111\u1ed9 tr\u01b0\u1eddng trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t) x\u00e1c \u0111\u1ecbnh tr\u01b0\u1eddng t\u1ed1i \u0111a<\/td>\n<\/tr>\n<tr>\n<td>Nhi\u1ec7t \u0111\u1ed9<\/td>\n<td>Nhi\u1ec7t \u0111\u1ed9 cao c\u00f3 th\u1ec3 l\u00e0m y\u1ebfu ho\u1eb7c l\u00e0m m\u1ea5t t\u1eeb t\u00ednh v\u0129nh vi\u1ec5n c\u1ee7a m\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u<\/td>\n<\/tr>\n<tr>\n<td>S\u1ed1c c\u01a1 h\u1ecdc v\u00e0 \u0103n m\u00f2n<\/td>\n<td>R\u01a1i ho\u1eb7c r\u1ec9 s\u00e9t c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m s\u1ee9c m\u1ea1nh t\u1eeb c\u1ee7a v\u1eadt li\u1ec7u theo th\u1eddi gian<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>M\u1eb9o th\u1ef1c t\u1ebf t\u00f4i s\u1eed d\u1ee5ng: ch\u1ecdn neodymium cho nhu c\u1ea7u nh\u1ecf g\u1ecdn, c\u01b0\u1eddng \u0111\u1ed9 cao; ch\u1ecdn ferrite \u0111\u1ec3 ti\u1ebft ki\u1ec7m chi ph\u00ed v\u00e0 ch\u1ed1ng \u0103n m\u00f2n; s\u1eed d\u1ee5ng Alnico khi c\u1ea7n \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh \u1edf nhi\u1ec7t \u0111\u1ed9 cao. \u0110\u1ec3 ki\u1ec3m tra \u0111\u1ed9 m\u1ea1nh, s\u1eed d\u1ee5ng m\u00e1y \u0111o gauss ho\u1eb7c so s\u00e1nh kh\u1ea3 n\u0103ng n\u00e2ng c\u1ee7a tr\u1ecdng l\u01b0\u1ee3ng \u0111\u00e3 bi\u1ebft.<\/p>\n<h2>C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a nam ch\u00e2m h\u00ecnh thanh, nam ch\u00e2m h\u00ecnh thanh l\u00e0 g\u00ec<\/h2>\n<p>T\u00f4i s\u1ebd ph\u00e2n t\u00edch c\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a nam ch\u00e2m th\u1eb3ng theo c\u00e1ch \u0111\u01a1n gi\u1ea3n. \u1ede c\u1ed1t l\u00f5i, m\u1ed9t nam ch\u00e2m th\u1eb3ng t\u1ea1o ra tr\u01b0\u1eddng t\u1eeb nh\u1edd nhi\u1ec1u v\u00f9ng nh\u1ecf t\u1eeb t\u00ednh b\u00ean trong n\u00f3 x\u1ebfp h\u00e0ng v\u00e0 ho\u1ea1t \u0111\u1ed9ng c\u00f9ng nhau.<\/p>\n<h3>V\u1eadt l\u00fd c\u01a1 b\u1ea3n \u0111\u1eb1ng sau t\u1eeb t\u00ednh trong nam ch\u00e2m h\u00ecnh thanh<\/h3>\n<ul>\n<li>Nguy\u00ean t\u1eed c\u00f3 nh\u1eefng moment t\u1eeb nh\u1ecf t\u1eeb spin electron v\u00e0 qu\u1ef9 \u0111\u1ea1o. Trong h\u1ea7u h\u1ebft c\u00e1c v\u1eadt li\u1ec7u, nh\u1eefng moment n\u00e0y ch\u1ec9 h\u01b0\u1edbng ng\u1eabu nhi\u00ean v\u00e0 tri\u1ec7t ti\u00eau l\u1eabn nhau.<\/li>\n<li>Trong m\u1ed9t nam ch\u00e2m th\u1eb3ng \u0111\u00e3 t\u1eeb h\u00f3a, nh\u1eefng moment n\u00e0y c\u1ed9ng l\u1ea1i v\u00ec c\u00e1c nh\u00f3m nguy\u00ean t\u1eed, g\u1ecdi l\u00e0 mi\u1ec1n t\u1eeb, x\u1ebfp c\u00f9ng h\u01b0\u1edbng, t\u1ea1o ra m\u1ed9t tr\u01b0\u1eddng t\u1eeb t\u1ed5ng h\u1ee3p.<\/li>\n<li>Tr\u01b0\u1eddng t\u1eeb c\u1ee7a nam ch\u00e2m th\u1eb3ng ch\u1ea3y t\u1eeb c\u1ef1c B\u1eafc \u0111\u1ebfn c\u1ef1c Nam b\u00ean ngo\u00e0i nam ch\u00e2m v\u00e0 \u0111\u00f3ng l\u1ea1i b\u00ean trong nam ch\u00e2m, t\u1ea1o th\u00e0nh c\u00e1c \u0111\u01b0\u1eddng l\u1ef1c r\u00f5 r\u00e0ng n\u1ebfu b\u1ea1n v\u1ebd ch\u00fang b\u1eb1ng b\u1ee5i s\u1eaft.<\/li>\n<\/ul>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam v\u1ec1 h\u00e0nh vi t\u1eeb t\u00ednh v\u0129nh vi\u1ec5n, xem trang c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 kh\u00e1i ni\u1ec7m nam ch\u00e2m v\u0129nh vi\u1ec5n.<\/p>\n<h3>S\u1ef1 s\u1eafp x\u1ebfp c\u1ee7a c\u00e1c mi\u1ec1n t\u1eeb<\/h3>\n<ul>\n<li>Mi\u1ec1n l\u00e0 c\u00e1c v\u00f9ng nh\u1ecf c\u00f3 c\u00e1c nguy\u00ean t\u1eed t\u1eeb x\u1ebfp h\u00e0ng theo c\u00f9ng h\u01b0\u1edbng. Trong kim lo\u1ea1i ch\u01b0a t\u1eeb h\u00f3a, ch\u00fang ch\u1ec9 h\u01b0\u1edbng kh\u00e1c nhau; trong nam ch\u00e2m th\u1eb3ng, h\u1ea7u h\u1ebft c\u00e1c mi\u1ec1n \u0111\u1ec1u h\u01b0\u1edbng gi\u1ed1ng nhau.<\/li>\n<li>T\u1eeb h\u00f3a x\u1ea3y ra trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t (x\u1eed l\u00fd nhi\u1ec7t, t\u1ea1o tr\u01b0\u1eddng t\u1eeb m\u1ea1nh) ho\u1eb7c b\u1eb1ng c\u00e1ch ch\u00e0 x\u00e1t m\u1ed9t nam ch\u00e2m qua nam ch\u00e2m kh\u00e1c. C\u00e1c v\u1eadt li\u1ec7u c\u00f3 \u0111\u1ed9 c\u01b0\u1ee1ng t\u1eeb cao gi\u1eef cho c\u00e1c mi\u1ec1n lu\u00f4n x\u1ebfp h\u00e0ng v\u00e0 duy tr\u00ec t\u1eeb t\u00ednh.<\/li>\n<li>N\u1ebfu c\u00e1c mi\u1ec1n b\u1ecb l\u1ec7ch h\u01b0\u1edbng (nhi\u1ec7t \u0111\u1ed9 cao, tr\u01b0\u1eddng \u0111\u1ed1i l\u1eadp m\u1ea1nh, s\u1ed1c c\u01a1 h\u1ecdc) nam ch\u00e2m th\u1eb3ng c\u00f3 th\u1ec3 y\u1ebfu \u0111i ho\u1eb7c m\u1ea5t t\u1eeb t\u00ednh.<\/li>\n<\/ul>\n<h3>T\u01b0\u01a1ng t\u00e1c v\u1edbi c\u00e1c v\u1eadt li\u1ec7u ferromagnetic<\/h3>\n<ul>\n<li>Nam ch\u00e2m th\u1eb3ng h\u00fat c\u00e1c kim lo\u1ea1i ferromagnetic nh\u01b0 s\u1eaft, niken, cobalt. C\u00e1c mi\u1ec1n c\u1ee7a nh\u1eefng kim lo\u1ea1i n\u00e0y d\u1ec5 d\u00e0ng t\u00e1i \u0111\u1ecbnh h\u01b0\u1edbng, do \u0111\u00f3 ch\u00fang tr\u1edf th\u00e0nh t\u1ea1m th\u1eddi t\u1eeb h\u00f3a khi g\u1ea7n nam ch\u00e2m th\u1eb3ng.<\/li>\n<li>T\u1eeb t\u00ednh g\u00e2y ra n\u00e0y t\u1ea1o ra c\u00e1c c\u1ef1c \u0111\u1ed1i l\u1eadp trong kim lo\u1ea1i g\u1ea7n \u0111\u00f3 v\u00e0 g\u00e2y ra l\u1ef1c h\u00fat. \u0110\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao nam ch\u00e2m th\u1eb3ng c\u00f3 th\u1ec3 nh\u1eb7t ghim gi\u1ea5y ho\u1eb7c k\u00e9o m\u1ed9t v\u00edt th\u00e9p.<\/li>\n<li>\u0110\u1ec3 bi\u1ebft r\u00f5 h\u01a1n v\u1ec1 nh\u1eefng v\u1eadt b\u1ecb nam ch\u00e2m h\u00fat, xem h\u01b0\u1edbng d\u1eabn c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 c\u00e1c v\u1eadt b\u1ecb nam ch\u00e2m h\u00fat.<\/li>\n<\/ul>\n<h3>C\u00e1c th\u00ed nghi\u1ec7m th\u1ef1c t\u1ebf<\/h3>\n<ul>\n<li>Th\u1eed nghi\u1ec7m ghim gi\u1ea5y: \u0111\u01b0a nam ch\u00e2m th\u1eb3ng g\u1ea7n m\u1ed9t \u0111\u1ed1ng ghim gi\u1ea5y. C\u00e1c ghim t\u1ea1m th\u1eddi b\u1ecb t\u1eeb h\u00f3a v\u00e0 d\u00ednh v\u00e0o nam ch\u00e2m \u2014 d\u1ea5u hi\u1ec7u r\u00f5 r\u00e0ng c\u1ee7a t\u1eeb t\u00ednh g\u00e2y ra.<\/li>\n<li>Th\u1eed nghi\u1ec7m la b\u00e0n: \u0111\u1eb7t m\u1ed9t chi\u1ebfc la b\u00e0n g\u1ea7n nam ch\u00e2m th\u1eb3ng. Kim la b\u00e0n (ch\u00ednh n\u00f3 l\u00e0 m\u1ed9t nam ch\u00e2m nh\u1ecf) quay \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi tr\u01b0\u1eddng t\u1eeb \u0111\u1ecba ph\u01b0\u01a1ng. N\u1ebfu c\u1ef1c B\u1eafc c\u1ee7a nam ch\u00e2m th\u1eb3ng h\u01b0\u1edbng v\u1ec1 ph\u00eda c\u1ef1c B\u1eafc c\u1ee7a kim la b\u00e0n, kim s\u1ebd quay \u0111i (\u0111\u1ea9y); c\u00e1c c\u1ef1c \u0111\u1ed1i l\u1eadp g\u00e2y ra l\u1ef1c h\u00fat.<\/li>\n<li>C\u1ef1c nam v\u00e0 c\u1ef1c b\u1eafc c\u1ee7a nam ch\u00e2m: gi\u1eef hai thanh nam ch\u00e2m g\u1ea7n nhau. C\u1ef1c c\u00f9ng (B\u1eafc-B\u1eafc ho\u1eb7c Nam-Nam) \u0111\u1ea9y nhau; c\u1ef1c kh\u00e1c (B\u1eafc-Nam) h\u00fat nhau. \u0110i\u1ec1u n\u00e0y th\u1ec3 hi\u1ec7n ho\u1ea1t \u0111\u1ed9ng c\u1ee7a c\u00e1c c\u1ef1c t\u1eeb tr\u00ean nam ch\u00e2m th\u1eb3ng.<\/li>\n<\/ul>\n<h2>Nam ch\u00e2m h\u00ecnh thanh l\u00e0 g\u00ec, \u1ee9ng d\u1ee5ng ph\u1ed5 bi\u1ebfn v\u00e0 c\u00f4ng d\u1ee5ng<\/h2>\n<p>T\u00f4i s\u1eed d\u1ee5ng nam ch\u00e2m th\u1eb3ng h\u00e0ng ng\u00e0y trong c\u00e1c bu\u1ed5i tr\u00ecnh di\u1ec5n v\u00e0 thi\u1ebft l\u1eadp trong c\u1eeda h\u00e0ng v\u00ec ch\u00fang \u0111\u01a1n gi\u1ea3n v\u00e0 \u0111\u00e1ng tin c\u1eady. \u0110\u00e2y l\u00e0 n\u01a1i nam ch\u00e2m th\u1eb3ng xu\u1ea5t hi\u1ec7n nhi\u1ec1u nh\u1ea5t v\u00e0 l\u00fd do t\u1ea1i sao ch\u00fang quan tr\u1ecdng.<\/p>\n<h3>C\u00e1c c\u00f4ng c\u1ee5 gi\u00e1o d\u1ee5c v\u00e0 th\u00ed nghi\u1ec7m<\/h3>\n<ul>\n<li>Tr\u01b0\u1eddng h\u1ecdc v\u00e0 h\u1ed9i ch\u1ee3 khoa h\u1ecdc: tr\u00ecnh di\u1ec5n c\u00e1c \u0111\u01b0\u1eddng t\u1eeb tr\u01b0\u1eddng b\u1eb1ng b\u1ee5i s\u1eaft ho\u1eb7c la b\u00e0n, th\u1ec3 hi\u1ec7n s\u1ef1 h\u00fat v\u00e0 \u0111\u1ea9y, d\u1ea1y v\u1ec1 c\u00e1c c\u1ef1c t\u1eeb tr\u00ean nam ch\u00e2m th\u1eb3ng.<\/li>\n<li>B\u1ed9 d\u1ee5ng c\u1ee5 ph\u00f2ng th\u00ed nghi\u1ec7m v\u00e0 d\u1ef1 \u00e1n STEM: l\u00fd t\u01b0\u1edfng cho c\u00e1c b\u00e0i h\u1ecdc th\u1ef1c h\u00e0nh v\u1ec1 tr\u01b0\u1eddng t\u1eeb c\u1ee7a nam ch\u00e2m th\u1eb3ng v\u00e0 c\u00e1c \u0111\u1eb7c t\u00ednh c\u1ee7a nam ch\u00e2m th\u1eb3ng.<\/li>\n<li>C\u00e1c bu\u1ed5i tr\u00ecnh di\u1ec5n d\u1ec5 d\u00e0ng: nh\u1eb7t k\u1eb9p gi\u1ea5y, di chuy\u1ec3n kim la b\u00e0n, ho\u1eb7c h\u00ecnh dung s\u1ef1 s\u1eafp x\u1ebfp c\u1ee7a c\u00e1c mi\u1ec1n t\u1eeb.<\/li>\n<\/ul>\n<h3>S\u1eed d\u1ee5ng h\u00e0ng ng\u00e0y trong gia \u0111\u00ecnh<\/h3>\n<ul>\n<li>Nam ch\u00e2m v\u00e0 k\u1eb9p d\u00e1n t\u1ee7 l\u1ea1nh: gi\u1eef ghi ch\u00fa v\u00e0 \u1ea3nh (l\u00e0m t\u1eeb ferrite ho\u1eb7c v\u1eadt li\u1ec7u li\u00ean k\u1ebft).<\/li>\n<li>Kh\u00f3a v\u00e0 m\u00f3c t\u1eeb: v\u00ed, t\u1ee7 v\u00e0 c\u00e1c kh\u00f3a nh\u1ecf s\u1eed d\u1ee5ng nam ch\u00e2m d\u1ea1ng thanh nh\u1ecf g\u1ecdn.<\/li>\n<li>Gi\u00e1 \u0111\u1ee1 d\u1ee5ng c\u1ee5, m\u00f3c t\u1eeb v\u00e0 t\u1ed5 ch\u1ee9c gara: gi\u1ea3i ph\u00e1p nhanh ch\u00f3ng, b\u1ec1n v\u1eefng cho c\u00e1c x\u01b0\u1edfng t\u1ea1i nh\u00e0.<\/li>\n<\/ul>\n<h3>\u1ee8ng d\u1ee5ng c\u00f4ng nghi\u1ec7p v\u00e0 c\u00f4ng ngh\u1ec7<\/h3>\n<ul>\n<li>\u0110\u1ed9ng c\u01a1 v\u00e0 b\u1ed9 truy\u1ec1n \u0111\u1ed9ng nguy\u00ean m\u1eabu: c\u00e1c thanh nam ch\u00e2m v\u0129nh c\u1eedu ho\u1ea1t \u0111\u1ed9ng t\u1ed1t cho c\u00e1c d\u1ef1 \u00e1n \u0111\u1ed9ng c\u01a1 nh\u1ecf v\u00e0 thi\u1ebft b\u1ecb th\u1eed nghi\u1ec7m.<\/li>\n<li>C\u1ea3m bi\u1ebfn v\u00e0 c\u00f4ng t\u1eafc: s\u1eed d\u1ee5ng v\u1edbi c\u00e1c c\u00f4ng t\u1eafc reed, c\u1ea3m bi\u1ebfn Hall, v\u00e0 c\u1ea3m bi\u1ebfn g\u1ea7n \u0111\u1ec3 k\u00edch ho\u1ea1t ho\u1eb7c hi\u1ec7u ch\u1ec9nh thi\u1ebft b\u1ecb - L\u01b0u tr\u1eef d\u1eef li\u1ec7u v\u00e0 b\u1ed9 truy\u1ec1n \u0111\u1ed9ng: nam ch\u00e2m v\u0129nh c\u1eedu \u0111\u00f3ng vai tr\u00f2 trong c\u00e1c th\u00e0nh ph\u1ea7n b\u1ed9 truy\u1ec1n \u0111\u1ed9ng v\u00e0 h\u1ec7 th\u1ed1ng \u0111\u1ecbnh v\u1ecb (th\u01b0\u1eddng d\u00f9ng nam ch\u00e2m th\u1eb3ng trong c\u00e1c thi\u1ebft b\u1ecb c\u1ed1 \u0111\u1ecbnh v\u00e0 nguy\u00ean m\u1eabu thay v\u00ec trong \u0111\u1ea7u ghi h\u00ecnh).<\/li>\n<\/ul>\n<h3>Vai tr\u00f2 trong c\u00e1c m\u00e1y t\u00e1ch t\u1eeb v\u00e0 m\u00e1y m\u00f3c s\u1ea3n xu\u1ea5t<\/h3>\n<ul>\n<li>M\u00e1y t\u00e1ch t\u1eeb v\u00e0 b\u1ed9 qu\u00e9t: nam ch\u00e2m th\u1eb3ng \u0111\u01b0\u1ee3c nh\u00fang trong v\u1ecf b\u0103ng chuy\u1ec1n, t\u1ea5m b\u1eaft v\u00e0 b\u1ed9 t\u00e1ch ng\u0103n k\u00e9o \u0111\u1ec3 lo\u1ea1i b\u1ecf kim lo\u1ea1i s\u1eaft kh\u1ecfi v\u1eadt li\u1ec7u h\u00e0ng lo\u1ea1t.<\/li>\n<li>M\u00e1y n\u00e2ng v\u00e0 gi\u1eef t\u1eeb: c\u00e1c b\u1ed9 nam ch\u00e2m th\u1eb3ng \u0111\u01a1n gi\u1ea3n n\u00e2ng ho\u1eb7c gi\u1eef c\u00e1c b\u1ed9 ph\u1eadn s\u1eaft trong d\u00e2y chuy\u1ec1n s\u1ea3n xu\u1ea5t.<\/li>\n<li>H\u1ed7 tr\u1ee3 ch\u1ebf t\u1ea1o: s\u1eed d\u1ee5ng trong c\u00e1c jig, thi\u1ebft b\u1ecb c\u1ed1 \u0111\u1ecbnh v\u00e0 k\u1eb9p t\u1eeb trong h\u00e0n v\u00e0 l\u1eafp r\u00e1p.<\/li>\n<\/ul>\n<h3>C\u00e1c v\u00ed d\u1ee5 th\u1ef1c t\u1ebf<\/h3>\n<ul>\n<li>K\u1eb9p gi\u1ea5y v\u00e0 ch\u00eca kh\u00f3a: tr\u00ecnh di\u1ec5n nh\u1eb7t nhanh.<\/li>\n<li>T\u01b0\u01a1ng t\u00e1c v\u1edbi la b\u00e0n: th\u1ec3 hi\u1ec7n c\u00e1c c\u1ef1c b\u1eafc v\u00e0 c\u1ef1c nam.<\/li>\n<li>M\u00e1y qu\u00e9t t\u1eeb v\u00e0 t\u1ea5m t\u00e1ch t\u1eeb: gi\u1eef cho v\u1eadt li\u1ec7u s\u1ea1ch trong c\u00e1c nh\u00e0 m\u00e1y th\u1ef1c ph\u1ea9m v\u00e0 t\u00e1i ch\u1ebf.<\/li>\n<\/ul>\n<p>Li\u00ean quan s\u1ea3n ph\u1ea9m NBAEM<br \/>\nT\u1ea1i NBAEM, ch\u00fang t\u00f4i cung c\u1ea5p nhi\u1ec1u lo\u1ea1i nam ch\u00e2m th\u1eb3ng ph\u00f9 h\u1ee3p cho c\u00e1c tr\u01b0\u1eddng h\u1ecdc, c\u1eeda h\u00e0ng v\u00e0 nh\u00e0 s\u1ea3n xu\u1ea5t t\u1ea1i Vi\u1ec7t Nam:<\/p>\n<ul>\n<li>Ch\u1ea5t li\u1ec7u: ferrite, ferrite li\u00ean k\u1ebft, Alnico v\u00e0 NdFe ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c nhu c\u1ea7u v\u1ec1 \u0111\u1ed9 m\u1ea1nh v\u00e0 chi ph\u00ed kh\u00e1c nhau.<\/li>\n<li>K\u00edch th\u01b0\u1edbc t\u00f9y ch\u1ec9nh v\u00e0 m\u1eabu nam ch\u00e2m h\u00f3a: c\u00e1c thanh c\u1eaft v\u00e0 nam ch\u00e2m h\u00f3a ph\u00f9 h\u1ee3p \u0111\u1ec3 l\u1eafp \u0111\u1eb7t v\u00e0o b\u1ed9 t\u00e1ch, thi\u1ebft b\u1ecb c\u1ed1 \u0111\u1ecbnh ho\u1eb7c b\u1ed9 d\u1ee5ng c\u1ee5 gi\u00e1o d\u1ee5c.<\/li>\n<li>L\u1edbp ph\u1ee7 v\u00e0 c\u00e1ch l\u1eafp \u0111\u1eb7t: c\u00e1c t\u00f9y ch\u1ecdn \u0111\u1ec3 ch\u1ed1ng \u0103n m\u00f2n ho\u1eb7c s\u1eed d\u1ee5ng an to\u00e0n cho th\u1ef1c ph\u1ea9m khi c\u1ea7n thi\u1ebft.<\/li>\n<li>H\u1ed7 tr\u1ee3: T\u00f4i c\u00f3 th\u1ec3 gi\u00fap ph\u00f9 h\u1ee3p m\u1ed9t nam ch\u00e2m que v\u1edbi \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n, d\u00f9 \u0111\u00f3 l\u00e0 tr\u00ecnh di\u1ec5n trong l\u1edbp h\u1ecdc, m\u00f4 h\u00ecnh \u0111\u1ed9ng c\u01a1 m\u1eabu, hay b\u1ed9 ph\u00e2n lo\u1ea1i t\u1eeb trong d\u00e2y chuy\u1ec1n s\u1ea3n xu\u1ea5t.<\/li>\n<\/ul>\n<h2>C\u00e1c lo\u1ea1i nam ch\u00e2m so s\u00e1nh v\u1edbi nam ch\u00e2m thanh<\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 so s\u00e1nh r\u00f5 r\u00e0ng c\u00e1c lo\u1ea1i nam ch\u00e2m ph\u1ed5 bi\u1ebfn \u0111\u1ec3 b\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y v\u1ecb tr\u00ed c\u1ee7a nam ch\u00e2m que.<\/p>\n<h3>Nh\u00ecn nhanh c\u00e1c lo\u1ea1i nam ch\u00e2m ph\u1ed5 bi\u1ebfn<\/h3>\n<ul>\n<li>Nam ch\u00e2m que\n<ul>\n<li>H\u00ecnh d\u1ea1ng h\u00ecnh ch\u1eef nh\u1eadt th\u1eb3ng, c\u00f3 c\u1ef1c B\u1eafc v\u00e0 c\u1ef1c Nam r\u00f5 r\u00e0ng d\u1ecdc theo c\u00e1c \u0111\u1ea7u. Th\u01b0\u1eddng l\u00e0 lo\u1ea1i v\u0129nh c\u1eedu ph\u1ed5 bi\u1ebfn \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong ph\u00f2ng th\u00ed nghi\u1ec7m v\u00e0 c\u00e1c thi\u1ebft b\u1ecb \u0111\u01a1n gi\u1ea3n.<\/li>\n<\/ul>\n<\/li>\n<li>Nam ch\u00e2m h\u00ecnh m\u00f3ng ng\u1ef1a\n<ul>\n<li>H\u00ecnh d\u1ea1ng ch\u1eef U, c\u00e1c c\u1ef1c g\u1ea7n nhau \u0111\u1ec3 t\u1eadp trung tr\u01b0\u1eddng t\u1eeb, t\u1ea1o l\u1ef1c n\u00e2ng m\u1ea1nh h\u01a1n \u1edf c\u00e1c \u0111\u1ea7u m\u00fat.<\/li>\n<\/ul>\n<\/li>\n<li>T\u1eeb tr\u01b0\u1eddng\n<ul>\n<li>Cu\u1ed9n d\u00e2y kim lo\u1ea1i tr\u1edf th\u00e0nh nam ch\u00e2m khi d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua. C\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh v\u00e0 c\u00f3 th\u1ec3 t\u1eaft.<\/li>\n<\/ul>\n<\/li>\n<li>Nam ch\u00e2m \u0111\u0129a\n<ul>\n<li>H\u00ecnh d\u1ea1ng ph\u1eb3ng, tr\u00f2n, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u1ea3m bi\u1ebfn, loa v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng l\u1eafp \u0111\u1eb7t.<\/li>\n<\/ul>\n<\/li>\n<li>Nam ch\u00e2m Neodymium\n<ul>\n<li>Nam ch\u00e2m v\u0129nh c\u1eedu r\u1ea5t m\u1ea1nh th\u01b0\u1eddng \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o th\u00e0nh d\u1ea1ng que, \u0111\u0129a ho\u1eb7c kh\u1ed1i. T\u00ecm hi\u1ec3u th\u00eam v\u1ec1 c\u00e1c lo\u1ea1i nam ch\u00e2m neodymium v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a ch\u00fang t\u1ea1i \u0111\u00e2y: <a href=\"https:\/\/nbaem.com\/vi\/what-a-neodymium-magnet\/\">https:\/\/nbaem.com\/what-a-neodymium-magnet\/<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>B\u1ea1n c\u0169ng c\u00f3 th\u1ec3 \u0111\u1ecdc v\u1ec1 c\u00e1c v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c lo\u1ea1i n\u00e0y t\u1ea1i \u0111\u00e2y <a href=\"https:\/\/nbaem.com\/vi\/what-are-magnets-made-of\/\">https:\/\/nbaem.com\/what-are-magnets-made-of\/<\/a><\/p>\n<h3>So s\u00e1nh \u0111\u1ed1i chi\u1ebfu<\/h3>\n<table>\n<thead>\n<tr>\n<th>\u0110\u1eb7c \u0111i\u1ec3m<\/th>\n<th>Nam ch\u00e2m que<\/th>\n<th style=\"text-align: right;\">H\u00ecnh m\u00f3ng ng\u1ef1a<\/th>\n<th style=\"text-align: right;\">T\u1eeb tr\u01b0\u1eddng<\/th>\n<th style=\"text-align: right;\">Nam ch\u00e2m \u0111\u0129a<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>H\u00ecnh d\u1ea1ng tr\u01b0\u1eddng<\/td>\n<td>\u0110i\u1ec3m c\u1ef1c th\u1eb3ng h\u00e0ng<\/td>\n<td style=\"text-align: right;\">T\u1eadp trung gi\u1eefa c\u00e1c c\u1ef1c<\/td>\n<td style=\"text-align: right;\">\u0110i\u1ec1u khi\u1ec3n b\u1eb1ng cu\u1ed9n d\u00e2y<\/td>\n<td style=\"text-align: right;\">H\u00ecnh tr\u00f2n\/ph\u1eb3ng<\/td>\n<\/tr>\n<tr>\n<td>Ph\u00f9 h\u1ee3p nh\u1ea5t cho<\/td>\n<td>Tr\u00ecnh di\u1ec5n c\u01a1 b\u1ea3n, gi\u1eef ch\u1eb7t<\/td>\n<td style=\"text-align: right;\">N\u00e2ng t\u1ea3i nh\u1ecf, k\u1eb9p ch\u1eb7t<\/td>\n<td style=\"text-align: right;\">N\u00e2ng n\u1eb7ng, c\u00f4ng t\u1eafc, \u0111i\u1ec1u khi\u1ec3n bi\u1ebfn \u0111\u1ed5i<\/td>\n<td style=\"text-align: right;\">C\u1ea3m bi\u1ebfn, loa, gi\u00e1 \u0111\u1ee1<\/td>\n<\/tr>\n<tr>\n<td>Ph\u1ea1m vi l\u1ef1c<\/td>\n<td>Th\u1ea5p \u0111\u1ebfn trung b\u00ecnh (t\u00f9y thu\u1ed9c v\u00e0o v\u1eadt li\u1ec7u)<\/td>\n<td style=\"text-align: right;\">Trung b\u00ecnh<\/td>\n<td style=\"text-align: right;\">Th\u1ea5p \u0111\u1ebfn cao<\/td>\n<td style=\"text-align: right;\">Th\u1ea5p \u0111\u1ebfn cao (\u0111\u0129a neodymium m\u1ea1nh)<\/td>\n<\/tr>\n<tr>\n<td>\u0110i\u1ec1u khi\u1ec3n b\u1eadt\/t\u1eaft<\/td>\n<td>No<\/td>\n<td style=\"text-align: right;\">No<\/td>\n<td style=\"text-align: right;\">C\u00f3<\/td>\n<td style=\"text-align: right;\">No<\/td>\n<\/tr>\n<tr>\n<td>Gi\u00e1 th\u00e0nh<\/td>\n<td>Th\u1ea5p<\/td>\n<td style=\"text-align: right;\">Th\u1ea5p\u2013trung b\u00ecnh<\/td>\n<td style=\"text-align: right;\">Trung cao (t\u00f9y thu\u1ed9c)<\/td>\n<td style=\"text-align: right;\">Th\u1ea5p\u2013trung b\u00ecnh<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u01afu \u0111i\u1ec3m c\u1ee7a nam ch\u00e2m thanh<\/h3>\n<ul>\n<li>M\u1eabu tr\u01b0\u1eddng t\u1eeb tr\u01b0\u1eddng \u0111\u01a1n gi\u1ea3n v\u00e0 d\u1ef1 \u0111o\u00e1n \u0111\u01b0\u1ee3c (h\u1eefu \u00edch \u0111\u1ec3 d\u1ea1y c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb).<\/li>\n<li>Ngu\u1ed3n r\u1ebb v\u00e0 d\u1ec5 d\u00e0ng cho c\u00e1c tr\u01b0\u1eddng h\u1ecdc, s\u1edf th\u00edch c\u00e1 nh\u00e2n, v\u00e0 s\u1eed d\u1ee5ng c\u00f4ng nghi\u1ec7p nh\u1eb9.<\/li>\n<li>Kh\u00f4ng c\u1ea7n ngu\u1ed3n \u0111i\u1ec7n, kh\u00f4ng \u0111i\u1ec1u khi\u1ec3n, b\u1ec1n l\u00e2u nh\u01b0 nam ch\u00e2m v\u0129nh c\u1eedu.<\/li>\n<li>C\u00f3 s\u1eb5n nhi\u1ec1u v\u1eadt li\u1ec7u v\u00e0 c\u1ea5p \u0111\u1ed9, bao g\u1ed3m neodymium v\u00e0 ferrite.<\/li>\n<\/ul>\n<h3>Nh\u01b0\u1ee3c \u0111i\u1ec3m so v\u1edbi c\u00e1c lo\u1ea1i nam ch\u00e2m kh\u00e1c<\/h3>\n<ul>\n<li>\u00cdt t\u1eadp trung tr\u01b0\u1eddng h\u01a1n so v\u1edbi nam ch\u00e2m h\u00ecnh m\u00f3ng ng\u1ef1a \u2014 l\u1ef1c n\u00e2ng y\u1ebfu h\u01a1n t\u1ea1i m\u1ed9t \u0111i\u1ec3m duy nh\u1ea5t.<\/li>\n<li>Kh\u00f4ng c\u00f3 \u0111i\u1ec1u khi\u1ec3n b\u1eadt\/t\u1eaft nh\u01b0 electromagnet n\u00ean kh\u00f4ng ph\u00f9 h\u1ee3p n\u01a1i c\u1ea7n t\u1eeb t\u00ednh t\u1ea1m th\u1eddi.<\/li>\n<li>K\u00edch th\u01b0\u1edbc c\u00f3 th\u1ec3 gi\u1edbi h\u1ea1n s\u1ee9c m\u1ea1nh \u2014 \u0111\u1ec3 c\u00f3 tr\u01b0\u1eddng m\u1ea1nh h\u01a1n, c\u1ea7n v\u1eadt li\u1ec7u l\u1edbn h\u01a1n ho\u1eb7c c\u1ea5p \u0111\u1ed9 cao h\u01a1n (thanh neodymium l\u00e0 ngo\u1ea1i l\u1ec7).<\/li>\n<li>H\u00ecnh d\u1ea1ng c\u00f3 th\u1ec3 kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng nh\u1ecf g\u1ecdn ho\u1eb7c \u0111\u1eb7c th\u00f9 n\u01a1i h\u00ecnh d\u1ea1ng \u0111\u0129a ho\u1eb7c t\u00f9y ch\u1ec9nh ph\u00f9 h\u1ee3p h\u01a1n.<\/li>\n<\/ul>\n<p>T\u00f4i th\u01b0\u1eddng khuy\u00ean d\u00f9ng nam ch\u00e2m thanh khi b\u1ea1n c\u1ea7n m\u1ed9t nam ch\u00e2m v\u0129nh c\u1eedu r\u1ebb ti\u1ec1n, \u0111\u00e1ng tin c\u1eady \u0111\u1ec3 tr\u00ecnh di\u1ec5n, c\u1ed1 \u0111\u1ecbnh ho\u1eb7c c\u00f4ng vi\u1ec7c nh\u1eb9. N\u1ebfu b\u1ea1n c\u1ea7n l\u1ef1c t\u1eadp trung, tr\u01b0\u1eddng c\u00f3 th\u1ec3 chuy\u1ec3n \u0111\u1ed5i ho\u1eb7c h\u00ecnh d\u1ea1ng nh\u1ecf g\u1ecdn, h\u00e3y xem x\u00e9t c\u00e1c l\u1ef1a ch\u1ecdn h\u00ecnh m\u00f3ng ng\u1ef1a, electromagnet ho\u1eb7c \u0111\u0129a thay th\u1ebf.<\/p>\n<h2>Ch\u0103m s\u00f3c v\u00e0 x\u1eed l\u00fd nam ch\u00e2m thanh<\/h2>\n<h3>M\u1eb9o b\u1ea3o qu\u1ea3n t\u1eeb t\u00ednh<\/h3>\n<ul>\n<li>T\u00f4i l\u01b0u tr\u1eef nam ch\u00e2m xa kh\u1ecfi nhi\u1ec7t v\u00e0 c\u00e1c tr\u01b0\u1eddng xoay chi\u1ec1u m\u1ea1nh \u2014 nhi\u1ec7t \u0111\u1ed9 v\u00e0 tr\u01b0\u1eddng xoay chi\u1ec1u l\u00e0 nh\u1eefng c\u00e1ch nhanh nh\u1ea5t \u0111\u1ec3 l\u00e0m y\u1ebfu nam ch\u00e2m h\u00ecnh thanh.<\/li>\n<li>Gi\u1eef c\u00e1c nam ch\u00e2m gh\u00e9p \u0111\u00f4i v\u1edbi c\u00e1c c\u1ef1c \u0111\u1ed1i di\u1ec7n ch\u1ea1m nhau ho\u1eb7c s\u1eed d\u1ee5ng b\u1ed9 gi\u1eef m\u1ec1m s\u1eaft \u0111\u1ec3 \u0111\u00f3ng m\u1ea1ch t\u1eeb c\u1ee7a c\u00e1c nam ch\u00e2m v\u0129nh c\u1eedu c\u0169; \u0111i\u1ec1u n\u00e0y gi\u00fap duy tr\u00ec tr\u01b0\u1eddng t\u1eeb.<\/li>\n<li>X\u1eed l\u00fd nam ch\u00e2m nh\u1eb9 nh\u00e0ng; va \u0111\u1eadp ho\u1eb7c r\u01a1i nhi\u1ec1u l\u1ea7n c\u00f3 th\u1ec3 l\u00e0m r\u1ed1i lo\u1ea1n c\u00e1c mi\u1ec1n t\u1eeb v\u00e0 gi\u1ea3m s\u1ee9c m\u1ea1nh t\u1eeb.<\/li>\n<\/ul>\n<h3>Tr\u00e1nh m\u1ea5t t\u1eeb t\u00ednh<\/h3>\n<ul>\n<li>Kh\u00f4ng \u0111\u1ec3 nam ch\u00e2m h\u00ecnh thanh ti\u1ebfp x\u00fac v\u1edbi nhi\u1ec7t \u0111\u1ed9 g\u1ea7n ho\u1eb7c tr\u00ean \u0111i\u1ec3m Curie c\u1ee7a ch\u00fang \u2014 th\u1eadm ch\u00ed ti\u1ebfp x\u00fac ng\u1eafn v\u1edbi nhi\u1ec7t \u0111\u1ed9 cao c\u0169ng c\u00f3 th\u1ec3 g\u00e2y m\u1ea5t t\u1eeb v\u0129nh vi\u1ec5n.<\/li>\n<li>Tr\u00e1nh c\u00e1c tr\u01b0\u1eddng t\u1eeb \u0111\u1ed1i l\u1eadp m\u1ea1nh (\u0111i\u1ec7n t\u1eeb l\u1edbn ho\u1eb7c c\u00e1c nam ch\u00e2m c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 cao kh\u00e1c) c\u00f3 th\u1ec3 l\u00e0m \u0111\u1ea3o chi\u1ec1u m\u1ed9t ph\u1ea7n ho\u1eb7c ho\u00e0n to\u00e0n c\u1ef1c t\u00ednh c\u1ee7a nam ch\u00e2m c\u1ee7a b\u1ea1n.<\/li>\n<li>Kh\u00f4ng d\u00f9ng b\u00faa, u\u1ed1n cong ho\u1eb7c g\u00e2y s\u1ed1c c\u01a1 h\u1ecdc cho nam ch\u00e2m \u2014 \u00e1p l\u1ef1c v\u1eadt l\u00fd c\u00f3 th\u1ec3 l\u00e0m m\u1ea5t t\u1eeb t\u00ednh theo th\u1eddi gian.<\/li>\n<\/ul>\n<h3>Th\u1ef1c h\u00e0nh l\u01b0u tr\u1eef v\u00e0 x\u1eed l\u00fd an to\u00e0n<\/h3>\n<ul>\n<li>S\u1eed d\u1ee5ng bao b\u00ec ch\u00ednh h\u00e3ng ho\u1eb7c c\u00e1c b\u1ed9 ph\u00e2n c\u00e1ch \u0111\u1ec7m \u0111\u1ec3 gi\u1eef nam ch\u00e2m kh\u00f4ng d\u00ednh ch\u1eb7t v\u00e0o nhau \u2014 \u0111\u1ed1i v\u1edbi nam ch\u00e2m m\u1ea1nh, t\u00f4i th\u00eam c\u00e1c b\u1ed9 ph\u00e2n c\u00e1ch ho\u1eb7c b\u00eca c\u1ee9ng gi\u1eefa c\u00e1c \u0111\u01a1n v\u1ecb.<\/li>\n<li>G\u1eafn nh\u00e3n khu v\u1ef1c l\u01b0u tr\u1eef v\u00e0 gi\u1eef nam ch\u00e2m xa kh\u1ecfi th\u1ebb t\u00edn d\u1ee5ng, \u1ed5 c\u1ee9ng HDD, thi\u1ebft b\u1ecb y t\u1ebf nh\u01b0 m\u00e1y t\u1ea1o nh\u1ecbp tim v\u00e0 c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed nh\u1ea1y c\u1ea3m ph\u1ed5 bi\u1ebfn trong c\u00e1c gia \u0111\u00ecnh v\u00e0 c\u1eeda h\u00e0ng t\u1ea1i Vi\u1ec7t Nam.<\/li>\n<li>L\u01b0u tr\u1eef tr\u00ean k\u1ec7 kh\u00f4ng t\u1eeb ho\u1eb7c trong h\u1ed9p g\u1ed7; tr\u00e1nh x\u1ebfp ch\u1ed3ng nam ch\u00e2m tr\u1ef1c ti\u1ebfp tr\u00ean c\u00e1c b\u1ec1 m\u1eb7t kim lo\u1ea1i.<\/li>\n<li>Khi di chuy\u1ec3n nam ch\u00e2m h\u00ecnh thanh m\u1ea1nh, \u0111eo g\u0103ng tay v\u00e0 \u0111eo k\u00ednh, di chuy\u1ec3n ch\u1eadm \u0111\u1ec3 tr\u00e1nh b\u1ecb k\u1eb9p.<\/li>\n<\/ul>\n<p>T\u00f4i tu\u00e2n th\u1ee7 c\u00e1c b\u01b0\u1edbc \u0111\u01a1n gi\u1ea3n n\u00e0y v\u00e0 khuy\u00ean kh\u00e1ch h\u00e0ng \u1edf Vi\u1ec7t Nam \u2014 ch\u00fang gi\u00fap duy tr\u00ec hi\u1ec7u su\u1ea5t c\u1ee7a nam ch\u00e2m \u0111\u00e1ng tin c\u1eady v\u00e0 an to\u00e0n khi x\u1eed l\u00fd.<\/p>\n<h2>T\u1ea1i sao ch\u1ecdn EM cho v\u1eadt li\u1ec7u t\u1eeb v\u00e0 nam ch\u00e2m thanh<\/h2>\n<p>Ch\u00fang t\u00f4i s\u1ea3n xu\u1ea5t nam ch\u00e2m cho kh\u00e1ch h\u00e0ng t\u1ea1i Vi\u1ec7t Nam c\u1ea7n hi\u1ec7u su\u1ea5t \u0111\u00e1ng tin c\u1eady, th\u1eddi gian ph\u1ea3n h\u1ed3i nhanh v\u00e0 d\u1ec5 t\u00f9y ch\u1ec9nh. \u0110\u00e2y l\u00e0 l\u00fd do kh\u00e1ch h\u00e0ng ch\u1ecdn NBAEM cho nam ch\u00e2m h\u00ecnh thanh v\u00e0 c\u00e1c v\u1eadt li\u1ec7u t\u1eeb kh\u00e1c.<\/p>\n<p>Nh\u1eefng g\u00ec ch\u00fang t\u00f4i mang l\u1ea1i<\/p>\n<ul>\n<li>Chuy\u00ean m\u00f4n s\u1ea3n xu\u1ea5t \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng minh\n<ul>\n<li>Nhi\u1ec1u n\u0103m kinh nghi\u1ec7m s\u1ea3n xu\u1ea5t nam ch\u00e2m v\u0129nh c\u1eedu bao g\u1ed3m neodymium, ferrite v\u00e0 c\u00e1c lo\u1ea1i \u0111\u1eb7c bi\u1ec7t.<\/li>\n<li>D\u00e2y chuy\u1ec1n s\u1ea3n xu\u1ea5t hi\u1ec7n \u0111\u1ea1i v\u00e0 ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng \u0111\u1ec3 gi\u1eef \u0111\u1ed9 m\u1ea1nh c\u1ee7a nam ch\u00e2m lu\u00f4n \u1ed5n \u0111\u1ecbnh.<\/li>\n<li>Hi\u1ec3u r\u00f5 nhu c\u1ea7u cung \u1ee9ng t\u1ea1i Vi\u1ec7t Nam, logistics xu\u1ea5t kh\u1ea9u v\u00e0 c\u00e1c \u0111\u01a1n h\u00e0ng t\u1eeb nh\u1ecf \u0111\u1ebfn l\u1edbn.<\/li>\n<\/ul>\n<\/li>\n<li>Ch\u1ea5t li\u1ec7u v\u00e0 t\u00f9y ch\u1ecdn ch\u1ea5t l\u01b0\u1ee3ng cao\n<ul>\n<li>Ch\u00fang t\u00f4i l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c v\u1eadt li\u1ec7u nam ch\u00e2m h\u00e0ng \u0111\u1ea7u v\u00e0 c\u00f3 th\u1ec3 gi\u1ea3i th\u00edch c\u00e1c \u0111\u00e1nh \u0111\u1ed5i v\u1ec1 v\u1eadt li\u1ec7u \u2014 xem ghi ch\u00fa c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 c\u1ea5u t\u1ea1o c\u1ee7a nam ch\u00e2m \u0111\u1ec3 bi\u1ebft chi ti\u1ebft.<\/li>\n<li>K\u00edch th\u01b0\u1edbc t\u00f9y ch\u1ec9nh, l\u1edbp ph\u1ee7, m\u1eabu t\u1eeb t\u00ednh, v\u00e0 ki\u1ec3m so\u00e1t dung sai ph\u00f9 h\u1ee3p v\u1edbi \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n.<\/li>\n<li>Ki\u1ec3m tra ti\u00eau chu\u1ea9n ng\u00e0nh v\u00e0 t\u00e0i li\u1ec7u \u0111i k\u00e8m c\u00f3 s\u1eb5n theo y\u00eau c\u1ea7u (\u0111\u1ed9 m\u1ea1nh t\u1eeb tr\u01b0\u1eddng, \u0111\u1ed9 ghi nh\u1edb, \u0111\u1ed9 c\u01b0\u1ee1ng t\u1eeb).<\/li>\n<\/ul>\n<\/li>\n<li>H\u1ed7 tr\u1ee3 t\u00f9y ch\u1ec9nh v\u00e0 thi\u1ebft k\u1ebf\n<ul>\n<li>C\u1eaft, t\u1ea1o h\u00ecnh, t\u1eeb h\u00f3a, v\u00e0 l\u1eafp r\u00e1p theo y\u00eau c\u1ea7u c\u1ee7a b\u1ea1n \u2014 t\u1eeb nam ch\u00e2m thanh nh\u1ecf cho nguy\u00ean m\u1eabu \u0111\u1ebfn c\u00e1c l\u00f4 s\u1ea3n xu\u1ea5t cho nh\u00e0 s\u1ea3n xu\u1ea5t thi\u1ebft b\u1ecb g\u1ed1c (OEM).<\/li>\n<li>H\u1ed7 tr\u1ee3 k\u1ef9 thu\u1eadt trong vi\u1ec7c ch\u1ecdn lo\u1ea1i ph\u00f9 h\u1ee3p (v\u00ed d\u1ee5 nam ch\u00e2m neodymium) v\u00e0 t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t t\u1eeb cho thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n.<\/li>\n<\/ul>\n<\/li>\n<li>H\u1ed7 tr\u1ee3 kh\u00e1ch h\u00e0ng v\u00e0 \u0111\u1ed9 tin c\u1eady\n<ul>\n<li>H\u1ed7 tr\u1ee3 b\u00e1n h\u00e0ng v\u00e0 k\u1ef9 thu\u1eadt ph\u1ea3n h\u1ed3i nhanh, n\u00f3i ti\u1ebfng Vi\u1ec7t d\u1ec5 hi\u1ec3u v\u00e0 gi\u00fap \u0111\u1ee1 v\u1ec1 b\u00e1o gi\u00e1, m\u1eabu th\u1eed, v\u00e0 th\u1eddi gian giao h\u00e0ng.<\/li>\n<li>Ch\u1ea5t l\u01b0\u1ee3ng s\u1ea3n xu\u1ea5t nh\u1ea5t qu\u00e1n v\u00e0 kh\u1ea3 n\u0103ng truy xu\u1ea5t ngu\u1ed3n g\u1ed1c \u2014 ch\u00fang t\u00f4i h\u1ed7 tr\u1ee3 \u0111\u01a1n h\u00e0ng b\u1eb1ng t\u00e0i li\u1ec7u v\u00e0 l\u1eddi khuy\u00ean th\u1ef1c t\u1ebf cho kh\u00e1ch h\u00e0ng t\u1ea1i Vi\u1ec7t Nam.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>C\u00e1c b\u01b0\u1edbc h\u00e0nh \u0111\u1ed9ng nhanh ch\u00f3ng<\/p>\n<ul>\n<li>B\u1ea1n mu\u1ed1n bi\u1ebft th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt s\u1ea3n ph\u1ea9m ho\u1eb7c l\u1ea5y m\u1eabu th\u1eed? Li\u00ean h\u1ec7 \u0111\u1ed9i ng\u0169 b\u00e1n h\u00e0ng c\u1ee7a ch\u00fang t\u00f4i ho\u1eb7c y\u00eau c\u1ea7u catalog qua website.<\/li>\n<li>C\u00f3 c\u00e2u h\u1ecfi c\u1ee5 th\u1ec3 v\u1ec1 v\u1eadt li\u1ec7u? v\u1ec1 nam ch\u00e2m neodymium c\u1ee7a ch\u00fang t\u00f4i ho\u1eb7c t\u00ecm hi\u1ec3u nam ch\u00e2m l\u00e0m t\u1eeb g\u00ec \u0111\u1ec3 quy\u1ebft \u0111\u1ecbnh l\u1ef1a ch\u1ecdn t\u1ed1t nh\u1ea5t.<\/li>\n<\/ul>\n<p>Y\u00eau c\u1ea7u b\u00e1o gi\u00e1 ho\u1eb7c catalog ngay h\u00f4m nay v\u00e0 cho ch\u00fang t\u00f4i bi\u1ebft k\u00edch th\u01b0\u1edbc, v\u1eadt li\u1ec7u, v\u00e0 y\u00eau c\u1ea7u t\u1eeb h\u00f3a c\u1ee7a nam ch\u00e2m thanh \u2014 ch\u00fang t\u00f4i s\u1ebd ph\u1ea3n h\u1ed3i v\u1ec1 th\u1eddi gian giao h\u00e0ng v\u00e0 gi\u00e1 c\u1ea3.<\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 nam ch\u00e2m thanh<\/h2>\n<h3>Nam ch\u00e2m thanh \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb ch\u1ea5t li\u1ec7u g\u00ec<\/h3>\n<p>Nam ch\u00e2m thanh c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb nhi\u1ec1u lo\u1ea1i v\u1eadt li\u1ec7u nam ch\u00e2m v\u0129nh c\u1eedu. C\u00e1c l\u1ef1a ch\u1ecdn ph\u1ed5 bi\u1ebfn:<\/p>\n<ul>\n<li><strong>G\u1ed1m (s\u1ee9)<\/strong> \u2013 r\u1ebb, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i cho nam ch\u00e2m t\u1ee7 l\u1ea1nh v\u00e0 nam ch\u00e2m trong l\u1edbp h\u1ecdc.<\/li>\n<li><strong>Alnico<\/strong> \u2013 h\u1ed7n h\u1ee3p s\u1eaft, nh\u00f4m, niken, cobalt; \u1ed5n \u0111\u1ecbnh nhi\u1ec7t t\u1ed1t.<\/li>\n<li><strong>Neodymium (NdFeB)<\/strong> \u2013 r\u1ea5t m\u1ea1nh, d\u00f9ng n\u01a1i c\u1ea7n \u0111\u1ed9 c\u1ee9ng cao v\u00e0 nh\u1ecf g\u1ecdn.<\/li>\n<li><strong>Cobalt Samari (SmCo)<\/strong> \u2013 hi\u1ec7u su\u1ea5t cao v\u00e0 ch\u1ecbu nhi\u1ec7t t\u1ed1t.<\/li>\n<\/ul>\n<p>\u0110\u1ec3 xem x\u00e9t k\u1ef9 h\u01a1n v\u1ec1 v\u1eadt li\u1ec7u t\u1eeb t\u00ednh, xem nam ch\u00e2m l\u00e0m t\u1eeb g\u00ec.<\/p>\n<h3>Nam ch\u00e2m thanh c\u00f3 th\u1ec3 m\u1ea5t t\u1eeb t\u00ednh kh\u00f4ng<\/h3>\n<p>C\u00f3. Nam ch\u00e2m thanh c\u00f3 th\u1ec3 m\u1ea5t \u0111\u1ed9 m\u1ea1nh do:<\/p>\n<ul>\n<li><strong>Nhi\u1ec7t<\/strong> (tr\u00ean nhi\u1ec7t \u0111\u1ed9 Curie c\u1ee7a v\u1eadt li\u1ec7u)<\/li>\n<li><strong>S\u1ed1c c\u01a1 h\u1ecdc m\u1ea1nh ho\u1eb7c \u0111\u1eadp m\u1ea1nh<\/strong><\/li>\n<li><strong>Ti\u1ebfp x\u00fac v\u1edbi c\u00e1c tr\u01b0\u1eddng t\u1eeb \u0111\u1ed1i l\u1eadp<\/strong><\/li>\n<li><strong>Suy gi\u1ea3m d\u1ea7n theo th\u1eddi gian d\u00e0i<\/strong> (nh\u1ecf \u0111\u1ed1i v\u1edbi nam ch\u00e2m v\u0129nh c\u1eedu ch\u1ea5t l\u01b0\u1ee3ng t\u1ed1t)<\/li>\n<\/ul>\n<p>N\u1ebfu b\u1ea1n mu\u1ed1n hi\u1ec3u l\u00fd thuy\u1ebft v\u1ec1 m\u1ea5t v\u00e0 ph\u1ee5c h\u1ed3i t\u1eeb t\u00ednh, h\u00e3y ki\u1ec3m tra hi\u1ec7n t\u01b0\u1ee3ng qu\u00e1n t\u00ednh t\u1eeb.<\/p>\n<h3>C\u00e1ch l\u00e0m nam ch\u00e2m thanh<\/h3>\n<p>B\u1ea1n c\u00f3 th\u1ec3 t\u1eeb t\u00ednh m\u1ed9t thanh ferromagnetic theo m\u1ed9t s\u1ed1 c\u00e1ch:<\/p>\n<ul>\n<li><strong>Ph\u01b0\u01a1ng ph\u00e1p qu\u1eb9t<\/strong>: qu\u1eb9t li\u00ean t\u1ee5c thanh b\u1eb1ng m\u1ed9t nam ch\u00e2m v\u0129nh c\u1eedu m\u1ea1nh theo m\u1ed9t h\u01b0\u1edbng.<\/li>\n<li><strong>Cu\u1ed9n d\u00e2y \u0111i\u1ec7n<\/strong>: \u0111\u1eb7t thanh trong m\u1ed9t cu\u1ed9n d\u00e2y solenoid v\u00e0 ch\u1ea1y d\u00f2ng DC qua cu\u1ed9n \u0111\u1ec3 c\u0103n ch\u1ec9nh c\u00e1c mi\u1ec1n t\u1eeb.<\/li>\n<li><strong>N\u00f3ng v\u00e0 l\u00e0m l\u1ea1nh trong tr\u01b0\u1eddng t\u1eeb<\/strong>: \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong s\u1ea3n xu\u1ea5t ki\u1ec3m so\u00e1t.<\/li>\n<\/ul>\n<p>L\u01b0u \u00fd: ph\u01b0\u01a1ng ph\u00e1p t\u1ef1 l\u00e0m ph\u00f9 h\u1ee3p cho c\u00e1c d\u1ef1 \u00e1n nh\u1ecf; vi\u1ec7c t\u1eeb h\u00f3a c\u00f4ng nghi\u1ec7p c\u1ea7n thi\u1ebft b\u1ecb ph\u00f9 h\u1ee3p.<\/p>\n<h3>S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa nam ch\u00e2m thanh v\u00e0 nam ch\u00e2m \u0111i\u1ec7n<\/h3>\n<ul>\n<li><strong>Nam ch\u00e2m thanh<\/strong> l\u00e0 v\u0129nh c\u1eedu: c\u1ef1c t\u1eeb c\u1ed1 \u0111\u1ecbnh, kh\u00f4ng c\u1ea7n ngu\u1ed3n \u0111i\u1ec7n.<\/li>\n<li><strong>Nam ch\u00e2m \u0111i\u1ec7n<\/strong> s\u1eed d\u1ee5ng d\u00f2ng \u0111i\u1ec7n trong cu\u1ed9n d\u00e2y: b\u1ea1n c\u00f3 th\u1ec3 b\u1eadt\/t\u1eaft v\u00e0 \u0111i\u1ec1u ch\u1ec9nh c\u01b0\u1eddng \u0111\u1ed9 b\u1eb1ng d\u00f2ng \u0111i\u1ec7n.<\/li>\n<li><strong>C\u00e1c \u1ee9ng d\u1ee5ng<\/strong>: nam ch\u00e2m thanh \u0111\u01a1n gi\u1ea3n v\u00e0 kh\u00f4ng c\u1ea7n b\u1ea3o tr\u00ec; nam ch\u00e2m \u0111i\u1ec7n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng khi c\u1ea7n tr\u01b0\u1eddng t\u1eeb \u0111i\u1ec1u ch\u1ec9nh \u0111\u01b0\u1ee3c ho\u1eb7c c\u01b0\u1eddng \u0111\u1ed9 cao (c\u1ea9u, MRI, n\u00e2ng c\u00f4ng nghi\u1ec7p).<\/li>\n<\/ul>\n<h3>M\u1ee9c \u0111\u1ed9 m\u1ea1nh c\u1ee7a tr\u01b0\u1eddng t\u1eeb c\u1ee7a m\u1ed9t nam ch\u00e2m thanh \u0111i\u1ec3n h\u00ecnh<\/h3>\n<p>C\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng thay \u0111\u1ed5i t\u00f9y theo v\u1eadt li\u1ec7u v\u00e0 k\u00edch th\u01b0\u1edbc. \u01af\u1edbc t\u00ednh c\u01b0\u1eddng \u0111\u1ed9 b\u1ec1 m\u1eb7t \u0111i\u1ec3n h\u00ecnh:<\/p>\n<ul>\n<li><strong>Thanh nam ch\u00e2m ferrite\/alnico nh\u1ecf d\u00f9ng trong l\u1edbp h\u1ecdc<\/strong>: kho\u1ea3ng 5\u2013100 miliTesla (mT) t\u1ea1i b\u1ec1 m\u1eb7t c\u1ef1c nam ch\u00e2m.<\/li>\n<li><strong>Thanh nam ch\u00e2m neodymium nh\u1ecf<\/strong>: kho\u1ea3ng 200\u20131000 mT (0.2\u20131 Tesla) t\u1ea1i b\u1ec1 m\u1eb7t, t\u00f9y thu\u1ed9c v\u00e0o lo\u1ea1i c\u1ea5p \u0111\u1ed9.<\/li>\n<li><strong>Nam ch\u00e2m c\u00f4ng nghi\u1ec7p ho\u1eb7c l\u1edbn<\/strong>: c\u00f3 th\u1ec3 cao h\u01a1n v\u00e0 \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 b\u1edfi nh\u00e0 s\u1ea3n xu\u1ea5t.<\/li>\n<\/ul>\n<p>N\u1ebfu b\u1ea1n c\u1ea7n s\u1ed1 li\u1ec7u c\u1ee5 th\u1ec3 cho m\u1ed9t s\u1ea3n ph\u1ea9m, h\u00e3y ki\u1ec3m tra c\u1ea5p \u0111\u1ed9 v\u1eadt li\u1ec7u v\u00e0 k\u00edch th\u01b0\u1edbc\u2014\u0111i\u1ec1u n\u00e0y quy\u1ebft \u0111\u1ecbnh \u0111\u1ed9 m\u1ea1nh t\u1eeb tr\u01b0\u1eddng.<\/p>","protected":false},"excerpt":{"rendered":"<p>Nam ch\u00e2m thanh bar l\u00e0 g\u00ec? T\u00ecm hi\u1ec3u v\u1ec1 \u0111\u1ecbnh ngh\u0129a, v\u1eadt li\u1ec7u, k\u00edch th\u01b0\u1edbc, c\u1ef1c t\u1eeb, c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng, c\u00f4ng d\u1ee5ng v\u00e0 c\u00e1ch b\u1ea3o qu\u1ea3n t\u1eeb c\u00e1c chuy\u00ean gia v\u1eadt li\u1ec7u t\u1eeb c\u1ee7a NBAEM<\/p>","protected":false},"author":1,"featured_media":1495,"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-1855","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"jetpack_featured_media_url":"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/03\/60ff697a1bf06.png","_links":{"self":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1855","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/comments?post=1855"}],"version-history":[{"count":1,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1855\/revisions"}],"predecessor-version":[{"id":1860,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1855\/revisions\/1860"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media\/1495"}],"wp:attachment":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media?parent=1855"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/categories?post=1855"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/tags?post=1855"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}