{"id":1779,"date":"2025-08-06T05:40:38","date_gmt":"2025-08-06T05:40:38","guid":{"rendered":"https:\/\/nbaem.com\/whats-ld-ratio-in-magnet\/"},"modified":"2025-08-06T07:56:54","modified_gmt":"2025-08-06T07:56:54","slug":"whats-ld-ratio-in-magnet","status":"publish","type":"post","link":"https:\/\/nbaem.com\/vi\/whats-ld-ratio-in-magnet\/","title":{"rendered":"T\u1ef7 l\u1ec7 D\u00e0i\/\u0110\u01b0\u1eddng k\u00ednh trong Nam ch\u00e2m l\u00e0 g\u00ec? Gi\u1ea3i th\u00edch v\u1ec1 Chi\u1ec1u d\u00e0i, \u0110\u01b0\u1eddng k\u00ednh, \u1ea2nh h\u01b0\u1edfng"},"content":{"rendered":"<p>N\u1ebfu b\u1ea1n \u0111ang kh\u00e1m ph\u00e1 th\u1ebf gi\u1edbi c\u1ee7a nam ch\u00e2m, c\u00f3 th\u1ec3 b\u1ea1n \u0111\u00e3 g\u1eb7p thu\u1eadt ng\u1eef\u00a0<strong>t\u1ef7 l\u1ec7 L\/D<\/strong>\u00a0v\u00e0 t\u1ef1 h\u1ecfi t\u1ea1i sao n\u00f3 l\u1ea1i quan tr\u1ecdng \u0111\u1ebfn v\u1eady. N\u00f3i \u0111\u01a1n gi\u1ea3n, \u0111\u00f3 l\u00e0\u00a0<strong>t\u1ef7 l\u1ec7 L\/D<\/strong>\u2014ho\u1eb7c t\u1ef7 l\u1ec7 chi\u1ec1u d\u00e0i tr\u00ean \u0111\u01b0\u1eddng k\u00ednh\u2014l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 h\u00ecnh h\u1ecdc quan tr\u1ecdng x\u00e1c \u0111\u1ecbnh c\u00e1ch h\u00ecnh d\u1ea1ng c\u1ee7a nam ch\u00e2m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t t\u1eeb tr\u01b0\u1eddng c\u1ee7a n\u00f3. D\u00f9 b\u1ea1n l\u00e0 k\u1ef9 s\u01b0 thi\u1ebft k\u1ebf c\u00e1c th\u00e0nh ph\u1ea7n t\u1eeb tr\u01b0\u1eddng ch\u00ednh x\u00e1c, sinh vi\u00ean h\u1ecdc v\u1ec1 t\u1eeb tr\u01b0\u1eddng, hay nh\u00e0 ph\u00e1t tri\u1ec3n s\u1ea3n ph\u1ea9m ch\u1ecdn nam ch\u00e2m ph\u00f9 h\u1ee3p, vi\u1ec7c hi\u1ec3u r\u00f5\u00a0<strong>t\u1ef7 l\u1ec7 L\/D trong nam ch\u00e2m<\/strong>\u00a0l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a \u0111\u1ed9 m\u1ea1nh, hi\u1ec7u qu\u1ea3 v\u00e0 s\u1ef1 \u1ed5n \u0111\u1ecbnh.<\/p>\n<p>Trong b\u00e0i vi\u1ebft n\u00e0y, b\u1ea1n s\u1ebd c\u00f3 m\u1ed9t ph\u00e2n t\u00edch r\u00f5 r\u00e0ng v\u1ec1 \u00fd ngh\u0129a c\u1ee7a\u00a0<strong>t\u1ef7 l\u1ec7 L\/D<\/strong>\u00a0c\u00e1ch t\u00ednh to\u00e1n n\u00f3 cho c\u00e1c h\u00ecnh d\u1ea1ng nam ch\u00e2m kh\u00e1c nhau, v\u00e0 t\u1ea1i sao n\u00f3 \u0111\u00f3ng vai tr\u00f2 then ch\u1ed1t trong ph\u00e2n b\u1ed1 tr\u01b0\u1eddng t\u1eeb v\u00e0 h\u00e0nh vi v\u1eadt li\u1ec7u. S\u1eb5n s\u00e0ng \u0111\u1ec3 kh\u00e1m ph\u00e1 khoa h\u1ecdc \u0111\u1eb1ng sau thi\u1ebft k\u1ebf nam ch\u00e2m v\u00e0 c\u00e1ch m\u00e0\u00a0<strong>t\u1ef7 l\u1ec7 L\/D<\/strong>\u00a0c\u00f3 th\u1ec3 t\u1ea1o ra ho\u1eb7c ph\u00e1 v\u1ee1 \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n? H\u00e3y b\u1eaft \u0111\u1ea7u n\u00e0o!<\/p>\n<h2>T\u1ef7 l\u1ec7 L\/D trong nam ch\u00e2m l\u00e0 g\u00ec<\/h2>\n<p>Khi l\u00e0m vi\u1ec7c v\u1edbi nam ch\u00e2m, \u0111\u1eb7c bi\u1ec7t l\u00e0 nam ch\u00e2m h\u00ecnh tr\u1ee5, b\u1ea1n c\u00f3 th\u1ec3 nghe v\u1ec1 t\u1ef7 l\u1ec7 L\/D. V\u1eady ch\u00ednh x\u00e1c n\u00f3 l\u00e0 g\u00ec? T\u1ef7 l\u1ec7 L\/D \u0111\u1ea1i di\u1ec7n cho\u00a0<strong>t\u1ef7 l\u1ec7 chi\u1ec1u d\u00e0i tr\u00ean \u0111\u01b0\u1eddng k\u00ednh<\/strong>. \u0110\u00e2y l\u00e0 c\u00e1ch \u0111\u01a1n gi\u1ea3n \u0111\u1ec3 m\u00f4 t\u1ea3 h\u00ecnh d\u1ea1ng c\u1ee7a nam ch\u00e2m b\u1eb1ng c\u00e1ch so s\u00e1nh chi\u1ec1u d\u00e0i c\u1ee7a n\u00f3 (chi\u1ec1u d\u00e0i) v\u1edbi \u0111\u1ed9 r\u1ed9ng c\u1ee7a n\u00f3 (\u0111\u01b0\u1eddng k\u00ednh).<\/p>\n<h3>\u0110\u1ecbnh ngh\u0129a T\u1ef7 l\u1ec7 Chi\u1ec1u d\u00e0i tr\u00ean \u0110\u01b0\u1eddng k\u00ednh<\/h3>\n<ul>\n<li><strong>Chi\u1ec1u d\u00e0i (L):<\/strong>\u00a0\u0110\u00e2y l\u00e0 ph\u00e9p \u0111o t\u1eeb m\u1ed9t \u0111\u1ea7u c\u1ee7a nam ch\u00e2m \u0111\u1ebfn \u0111\u1ea7u kia, theo chi\u1ec1u d\u00e0i d\u00e0i nh\u1ea5t c\u1ee7a n\u00f3.<\/li>\n<li><strong>\u0110\u01b0\u1eddng k\u00ednh (D):<\/strong>\u00a0\u0110\u00e2y l\u00e0 \u0111\u1ed9 r\u1ed9ng qua trung t\u00e2m c\u1ee7a nam ch\u00e2m, \u0111o qua trung t\u00e2m n\u1ebfu n\u00f3 h\u00ecnh tr\u1ee5 ho\u1eb7c tr\u00f2n.<\/li>\n<\/ul>\n<p>T\u1ef7 l\u1ec7 L\/D \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00e1ch chia chi\u1ec1u d\u00e0i cho \u0111\u01b0\u1eddng k\u00ednh:<\/p>\n<p><strong>T\u1ef7 l\u1ec7 L\/D = Chi\u1ec1u d\u00e0i \u00f7 \u0110\u01b0\u1eddng k\u00ednh<\/strong><\/p>\n<h3>T\u00ednh to\u00e1n t\u1ef7 l\u1ec7 L\/D cho nam ch\u00e2m h\u00ecnh tr\u1ee5<\/h3>\n<p>\u0110\u1ed1i v\u1edbi\u00a0<strong>nam ch\u00e2m h\u00ecnh tr\u1ee5<\/strong>, \u0111i\u1ec1u n\u00e0y r\u1ea5t \u0111\u01a1n gi\u1ea3n:<\/p>\n<ul>\n<li>\u0110o chi\u1ec1u d\u00e0i c\u1ee7a nam ch\u00e2m b\u1eb1ng th\u01b0\u1edbc ho\u1eb7c th\u01b0\u1edbc c\u1eb7p.<\/li>\n<li>\u0110o \u0111\u01b0\u1eddng k\u00ednh (ph\u1ea7n r\u1ed9ng nh\u1ea5t qua m\u1eb7t ph\u1eb3ng tr\u00f2n).<\/li>\n<li>Chia chi\u1ec1u d\u00e0i cho \u0111\u01b0\u1eddng k\u00ednh.<\/li>\n<\/ul>\n<p>N\u1ebfu m\u1ed9t nam ch\u00e2m d\u00e0i 20 mm v\u00e0 \u0111\u01b0\u1eddng k\u00ednh 10 mm, t\u1ef7 l\u1ec7 L\/D l\u00e0 2 (20 \u00f7 10 = 2).<\/p>\n<h3>T\u1ef7 l\u1ec7 L\/D cho c\u00e1c h\u00ecnh d\u1ea1ng kh\u00e1c<\/h3>\n<p>Trong khi ph\u1ed5 bi\u1ebfn nh\u1ea5t l\u00e0 d\u00f9ng cho h\u00ecnh tr\u1ee5, kh\u00e1i ni\u1ec7m n\u00e0y c\u0169ng \u00e1p d\u1ee5ng cho c\u00e1c h\u00ecnh d\u1ea1ng kh\u00e1c:<\/p>\n<ul>\n<li><strong>Nam ch\u00e2m h\u00ecnh ch\u1eef nh\u1eadt:<\/strong>\u00a0Th\u01b0\u1eddng l\u00e0 t\u1ef7 l\u1ec7 chi\u1ec1u d\u00e0i so v\u1edbi chi\u1ec1u r\u1ed9ng.<\/li>\n<li><strong>Nam ch\u00e2m h\u00ecnh v\u00f2ng:<\/strong>\u00a0Xem x\u00e9t \u0111\u1ed9 d\u00e0y l\u00e0 chi\u1ec1u d\u00e0i v\u00e0 \u0111\u01b0\u1eddng k\u00ednh ngo\u00e0i \u0111\u1ec3 t\u00ednh t\u1ef7 l\u1ec7.<\/li>\n<li><strong>H\u00ecnh d\u1ea1ng t\u00f9y ch\u1ec9nh:<\/strong>\u00a0\u0110o k\u00edch th\u01b0\u1edbc ch\u00ednh t\u01b0\u01a1ng t\u1ef1 nh\u01b0 chi\u1ec1u d\u00e0i v\u00e0 di\u1ec7n t\u00edch m\u1eb7t c\u1eaft l\u1edbn nh\u1ea5t \u0111\u1ec3 l\u1ea5y \u0111\u01b0\u1eddng k\u00ednh.<\/li>\n<\/ul>\n<h3>H\u00ecnh dung t\u1ef7 l\u1ec7 L\/D<\/h3>\n<p>H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng m\u1ed9t h\u00ecnh tr\u1ee5 tr\u00f4ng cao v\u00e0 m\u1ea3nh h\u01a1n so v\u1edbi m\u1ed9t h\u00ecnh tr\u1ee5 ng\u1eafn v\u00e0 d\u00e0y h\u01a1n. Ng\u01b0\u1eddi cao, m\u1ea3nh c\u00f3\u00a0<strong>t\u1ef7 l\u1ec7 L\/D cao<\/strong>, v\u00e0 ng\u01b0\u1eddi ng\u1eafn, d\u00e0y c\u00f3\u00a0<strong>T\u1ef7 l\u1ec7 L\/D th\u1ea5p<\/strong>. T\u1ef7 l\u1ec7 \u0111\u01a1n gi\u1ea3n n\u00e0y ngay l\u1eadp t\u1ee9c cho b\u1ea1n bi\u1ebft li\u1ec7u nam ch\u00e2m c\u00f3 d\u00e0i ho\u1eb7c th\u1ea5p, \u0111i\u1ec1u n\u00e0y \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a n\u00f3.<\/p>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t t\u1ed5ng quan nhanh:<\/p>\n<div class=\"table-responsive\">\n<table class=\"table\">\n<thead>\n<tr>\n<th>H\u00ecnh d\u1ea1ng nam ch\u00e2m<\/th>\n<th>Chi\u1ec1u d\u00e0i (L)<\/th>\n<th>\u0110\u01b0\u1eddng k\u00ednh (D)<\/th>\n<th>T\u1ef7 l\u1ec7 L\/D (L \u00f7 D)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>H\u00ecnh tr\u1ee5 cao<\/td>\n<td>30 mm<\/td>\n<td>10 mm<\/td>\n<td>3<\/td>\n<\/tr>\n<tr>\n<td>H\u00ecnh tr\u1ee5 ng\u1eafn<\/td>\n<td>10 mm<\/td>\n<td>10 mm<\/td>\n<td>1<\/td>\n<\/tr>\n<tr>\n<td>H\u00ecnh tr\u1ee5 d\u00e0y<\/td>\n<td>10 mm<\/td>\n<td>20 mm<\/td>\n<td>0.5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Hi\u1ec3u r\u00f5 t\u1ef7 l\u1ec7 n\u00e0y l\u00e0 b\u01b0\u1edbc \u0111\u1ea7u \u0111\u1ec3 n\u1eafm b\u1eaft c\u00e1ch h\u00ecnh d\u1ea1ng c\u1ee7a nam ch\u00e2m \u0111\u00f3ng vai tr\u00f2 trong \u0111\u1eb7c t\u00ednh t\u1eeb v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a n\u00f3.<\/p>\n<h2>T\u1ea1i sao T\u1ef7 l\u1ec7 L\/D l\u1ea1i quan tr\u1ecdng trong v\u1eadt li\u1ec7u t\u1eeb<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/artseo.cn\/apis\/uploads\/20250806\/LD_Ratio_in_Magnetic_Materials_4F0.webp\" alt=\"T\u1ef7 l\u1ec7 L\/D trong V\u1eadt li\u1ec7u t\u1eeb\" \/><\/p>\n<p>T\u1ef7 l\u1ec7 L\/D, hay t\u1ef7 l\u1ec7 chi\u1ec1u d\u00e0i tr\u00ean \u0111\u01b0\u1eddng k\u00ednh, \u0111\u00f3ng vai tr\u00f2 l\u1edbn trong c\u00e1ch nam ch\u00e2m ho\u1ea1t \u0111\u1ed9ng. N\u00f3 \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn ph\u00e2n b\u1ed1 tr\u01b0\u1eddng t\u1eeb, ngh\u0129a l\u00e0 c\u00e1ch tr\u01b0\u1eddng t\u1eeb lan r\u1ed9ng t\u1eeb nam ch\u00e2m. T\u1ef7 l\u1ec7 L\/D cao ho\u1eb7c th\u1ea5p h\u01a1n thay \u0111\u1ed5i v\u1ecb tr\u00ed m\u1ea1nh nh\u1ea5t c\u1ee7a tr\u01b0\u1eddng t\u1eeb v\u00e0 m\u1ee9c \u0111\u1ed9 t\u1eadp trung c\u1ee7a n\u00f3.<\/p>\n<p>T\u1ef7 l\u1ec7 n\u00e0y c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c y\u1ebfu t\u1ed1 hi\u1ec7u su\u1ea5t ch\u00ednh nh\u01b0:<\/p>\n<ul>\n<li><strong>M\u1eadt \u0111\u1ed9 flux t\u1eeb<\/strong>: \u0110\u1ed9 m\u1ea1nh c\u1ee7a tr\u01b0\u1eddng t\u1eeb g\u1ea7n b\u1ec1 m\u1eb7t nam ch\u00e2m thay \u0111\u1ed5i theo c\u00e1c t\u1ef7 l\u1ec7 L\/D kh\u00e1c nhau.<\/li>\n<li><strong>Kh\u1ea3 n\u0103ng ch\u1ed1ng m\u1ea5t t\u1eeb<\/strong>: Kh\u1ea3 n\u0103ng ch\u1ed1ng m\u1ea5t t\u1eeb c\u1ee7a nam ch\u00e2m c\u00f3 th\u1ec3 ph\u1ee5 thu\u1ed9c v\u00e0o h\u00ecnh d\u1ea1ng v\u00e0 t\u1ef7 l\u1ec7 k\u00edch th\u01b0\u1edbc c\u1ee7a n\u00f3.<\/li>\n<li><strong>\u0110\u1ed9 gi\u1eef t\u1eeb<\/strong>: M\u1ee9c \u0111\u1ed9 t\u1eeb d\u01b0 c\u00f2n l\u1ea1i sau khi lo\u1ea1i b\u1ecf tr\u01b0\u1eddng t\u1eeb b\u00ean ngo\u00e0i b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi L\/D.<\/li>\n<\/ul>\n<p>T\u1ed1i \u01b0u h\u00f3a t\u1ef7 l\u1ec7 L\/D gi\u00fap l\u00e0m cho nam ch\u00e2m ho\u1ea1t \u0111\u1ed9ng t\u1ed1t h\u01a1n cho c\u00e1c m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng c\u1ee5 th\u1ec3. V\u00ed d\u1ee5, m\u1ed9t nam ch\u00e2m \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 gi\u1eef d\u1ee5ng c\u1ee5 c\u00f3 th\u1ec3 c\u1ea7n m\u1ed9t t\u1ef7 l\u1ec7 kh\u00e1c so v\u1edbi nam ch\u00e2m d\u00f9ng trong \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n. B\u1eb1ng c\u00e1ch \u0111i\u1ec1u ch\u1ec9nh t\u1ef7 l\u1ec7 L\/D, nh\u00e0 s\u1ea3n xu\u1ea5t c\u00f3 th\u1ec3 t\u00f9y ch\u1ec9nh c\u01b0\u1eddng \u0111\u1ed9 t\u1eeb tr\u01b0\u1eddng v\u00e0 hi\u1ec7u qu\u1ea3 \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi kh\u00f4ng gian v\u00e0 nhu c\u1ea7u hi\u1ec7u su\u1ea5t c\u1ee7a t\u1eebng \u1ee9ng d\u1ee5ng. Vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a h\u00ecnh d\u1ea1ng n\u00e0y c\u1ea3i thi\u1ec7n \u0111\u1ed9 tin c\u1eady v\u00e0 hi\u1ec7u qu\u1ea3 t\u1eeb tr\u01b0\u1eddng t\u1ed5ng th\u1ec3.<\/p>\n<h2>T\u00e1c \u0111\u1ed9ng c\u1ee7a T\u1ef7 l\u1ec7 L\/D \u0111\u1ed1i v\u1edbi c\u00e1c Lo\u1ea1i Nam ch\u00e2m<\/h2>\n<p>T\u1ef7 l\u1ec7 L\/D \u0111\u00f3ng vai tr\u00f2 kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o lo\u1ea1i nam ch\u00e2m b\u1ea1n \u0111ang l\u00e0m vi\u1ec7c c\u00f9ng. \u0110\u1ed1i v\u1edbi c\u00e1c lo\u1ea1i nam ch\u00e2m ph\u1ed5 bi\u1ebfn nh\u01b0 Neodymium, Ferrite v\u00e0 Alnico, t\u1ef7 l\u1ec7 chi\u1ec1u d\u00e0i so v\u1edbi \u0111\u01b0\u1eddng k\u00ednh \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh t\u1eeb tr\u01b0\u1eddng, hi\u1ec7u qu\u1ea3 v\u00e0 hi\u1ec7u su\u1ea5t t\u1ed5ng th\u1ec3 theo nh\u1eefng c\u00e1ch ri\u00eang bi\u1ec7t.<\/p>\n<h3>Nam ch\u00e2m Neodymium<\/h3>\n<ul>\n<li>Th\u01b0\u1eddng c\u00f3 t\u1ef7 l\u1ec7 L\/D nh\u1ecf h\u01a1n (kho\u1ea3ng 0.5 \u0111\u1ebfn 2) v\u00ec ch\u00fang m\u1ea1nh ngay c\u1ea3 khi nh\u1ecf g\u1ecdn.<\/li>\n<li>T\u1ef7 l\u1ec7 L\/D cao h\u01a1n \u1edf \u0111\u00e2y c\u00f3 th\u1ec3 t\u1eadp trung tr\u01b0\u1eddng t\u1eeb t\u1ed1t h\u01a1n nh\u01b0ng c\u00f3 th\u1ec3 gi\u1ea3m \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh c\u01a1 h\u1ecdc.<\/li>\n<li>S\u1eed d\u1ee5ng trong \u0111i\u1ec7n t\u1eed v\u00e0 d\u1ee5ng c\u1ee5 ch\u00ednh x\u00e1c n\u01a1i kh\u00f4ng gian v\u00e0 tr\u01b0\u1eddng m\u1ea1nh m\u1ebd quan tr\u1ecdng.<\/li>\n<\/ul>\n<h3>Nam ch\u00e2m ferrite<\/h3>\n<ul>\n<li>Th\u01b0\u1eddng c\u00f3 t\u1ef7 l\u1ec7 L\/D l\u1edbn h\u01a1n (1 \u0111\u1ebfn 5), v\u00ec s\u1ee9c m\u1ea1nh th\u1ea5p h\u01a1n c\u1ee7a ch\u00fang l\u1ee3i \u00edch t\u1eeb h\u00ecnh d\u1ea1ng d\u00e0i \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng m\u1eadt \u0111\u1ed9 flux t\u1eeb tr\u01b0\u1eddng.<\/li>\n<li>Hi\u1ec7u qu\u1ea3 h\u01a1n trong \u0111\u1ed9ng c\u01a1 v\u00e0 loa n\u01a1i c\u1ea7n m\u1ed9t tr\u01b0\u1eddng t\u1eeb \u1ed5n \u0111\u1ecbnh d\u1ecdc theo chi\u1ec1u d\u00e0i.<\/li>\n<\/ul>\n<h3>Nam Ch\u00e2m Alnico<\/h3>\n<ul>\n<li>C\u00f3 t\u1ef7 l\u1ec7 L\/D trung b\u00ecnh (kho\u1ea3ng 1 \u0111\u1ebfn 3) do c\u00e2n b\u1eb1ng gi\u1eefa c\u01b0\u1eddng \u0111\u1ed9 t\u1eeb tr\u01b0\u1eddng v\u00e0 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t.<\/li>\n<li>S\u1eed d\u1ee5ng trong c\u1ea3m bi\u1ebfn v\u00e0 b\u1ed9 thu n\u01a1i h\u00ecnh d\u1ea1ng v\u00e0 hi\u1ec7u su\u1ea5t nhi\u1ec7t \u0111\u1ec1u quan tr\u1ecdng.<\/li>\n<\/ul>\n<h3>V\u00ed d\u1ee5 trong ng\u00e0nh c\u00f4ng nghi\u1ec7p<\/h3>\n<ul>\n<li>Trong l\u0129nh v\u1ef1c \u00f4 t\u00f4, c\u1ea3m bi\u1ebfn t\u1ed1c \u0111\u1ed9 b\u00e1nh xe th\u01b0\u1eddng s\u1eed d\u1ee5ng nam ch\u00e2m c\u00f3 t\u1ef7 l\u1ec7 L\/D g\u1ea7n 1 \u0111\u1ec3 c\u00e2n b\u1eb1ng gi\u1eefa \u0111\u1ed9 m\u1ea1nh v\u00e0 k\u00edch th\u01b0\u1edbc.<\/li>\n<li>\u0110\u1ed1i v\u1edbi c\u00e1c b\u1ed9 truy\u1ec1n t\u1eeb, nam ch\u00e2m d\u00e0i h\u01a1n v\u1edbi t\u1ef7 l\u1ec7 L\/D cao h\u01a1n c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng b\u00e1m v\u00e0 truy\u1ec1n m\u00f4-men xo\u1eafn.<\/li>\n<li>Thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed ti\u00eau d\u00f9ng \u01b0a chu\u1ed9ng nam ch\u00e2m ng\u1eafn h\u01a1n, r\u1ed9ng h\u01a1n (t\u1ef7 l\u1ec7 L\/D th\u1ea5p) \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi kh\u00f4ng gian nh\u1ecf g\u1ecdn trong khi v\u1eabn duy tr\u00ec c\u00f4ng su\u1ea5t.<\/li>\n<\/ul>\n<h3>T\u00e1c \u0111\u1ed9ng \u0111\u1ebfn \u0110\u1ed9 \u1ed5n \u0111\u1ecbnh v\u00e0 Hi\u1ec7u qu\u1ea3<\/h3>\n<ul>\n<li>T\u1ef7 l\u1ec7 L\/D \u0111\u01b0\u1ee3c ch\u1ecdn ph\u00f9 h\u1ee3p gi\u00fap c\u1ea3i thi\u1ec7n \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh t\u1eeb tr\u01b0\u1eddng b\u1eb1ng c\u00e1ch gi\u1ea3m c\u00e1c tr\u01b0\u1eddng t\u1eeb m\u1ea5t kh\u1ea3 n\u0103ng t\u1eeb h\u00f3a.<\/li>\n<li>Hi\u1ec7u qu\u1ea3 t\u0103ng l\u00ean khi h\u00ecnh d\u1ea1ng nam ch\u00e2m ph\u00f9 h\u1ee3p v\u1edbi h\u01b0\u1edbng tr\u01b0\u1eddng v\u00e0 m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng.<\/li>\n<li>L\u1ef1a ch\u1ecdn t\u1ef7 l\u1ec7 L\/D kh\u00f4ng ph\u00f9 h\u1ee3p c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn l\u00e3ng ph\u00ed v\u1eadt li\u1ec7u ho\u1eb7c gi\u1ea3m s\u00fat hi\u1ec7u su\u1ea5t t\u1eeb tr\u01b0\u1eddng.<\/li>\n<\/ul>\n<p>Hi\u1ec3u r\u00f5 c\u00e1ch t\u1ef7 l\u1ec7 L\/D \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c lo\u1ea1i nam ch\u00e2m kh\u00e1c nhau gi\u00fap b\u1ea1n ch\u1ecdn h\u00ecnh d\u1ea1ng ph\u00f9 h\u1ee3p nh\u1ea5t cho d\u1ef1 \u00e1n c\u1ee7a m\u00ecnh, gi\u1ea3m chi ph\u00ed v\u00e0 n\u00e2ng cao hi\u1ec7u su\u1ea5t.<\/p>\n<h2>C\u00e1ch ch\u1ecdn T\u1ef7 l\u1ec7 L\/D ph\u00f9 h\u1ee3p cho \u1ee8ng d\u1ee5ng c\u1ee7a b\u1ea1n<\/h2>\n<p>Ch\u1ecdn t\u1ef7 l\u1ec7 L\/D ph\u00f9 h\u1ee3p cho nam ch\u00e2m c\u1ee7a b\u1ea1n ch\u1ee7 y\u1ebfu ph\u1ee5 thu\u1ed9c v\u00e0o nhu c\u1ea7u c\u1ee7a d\u1ef1 \u00e1n. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 nh\u1eefng \u0111i\u1ec1u c\u1ea7n ghi nh\u1edb:<\/p>\n<ul>\n<li>\n<h3>H\u1ea1n ch\u1ebf v\u1ec1 kh\u00f4ng gian<\/h3>\n<p>\u0110o k\u00edch th\u01b0\u1edbc kh\u00f4ng gian n\u01a1i nam ch\u00e2m s\u1ebd ph\u00f9 h\u1ee3p. T\u1ef7 l\u1ec7 L\/D cao c\u00f3 ngh\u0129a l\u00e0 nam ch\u00e2m d\u00e0i h\u01a1n, trong khi t\u1ef7 l\u1ec7 th\u1ea5p h\u01a1n l\u00e0 d\u1ea1ng th\u1ea5p h\u01a1n. \u0110\u1ea3m b\u1ea3o h\u00ecnh d\u1ea1ng nam ch\u00e2m ph\u00f9 h\u1ee3p v\u1edbi gi\u1edbi h\u1ea1n v\u1eadt l\u00fd c\u1ee7a b\u1ea1n.<\/li>\n<li>\n<h3>Y\u00eau c\u1ea7u v\u1ec1 tr\u01b0\u1eddng t\u1eeb<\/h3>\n<p>H\u00e3y suy ngh\u0129 v\u1ec1 m\u1ee9c \u0111\u1ed9 m\u1ea1nh v\u00e0 t\u1eadp trung c\u1ee7a tr\u01b0\u1eddng t\u1eeb m\u00e0 b\u1ea1n c\u1ea7n. Nam ch\u00e2m d\u00e0i h\u01a1n (t\u1ef7 l\u1ec7 L\/D cao h\u01a1n) th\u01b0\u1eddng t\u1ea1o ra c\u00e1c tr\u01b0\u1eddng h\u01b0\u1edbng h\u01b0\u1edbng nhi\u1ec1u h\u01a1n, trong khi nam ch\u00e2m ng\u1eafn h\u01a1n ph\u00e2n t\u00e1n tr\u01b0\u1eddng ra nhi\u1ec1u h\u01a1n.<\/li>\n<li>\n<h3>Nhu c\u1ea7u h\u01b0\u1edbng<\/h3>\n<p>N\u1ebfu b\u1ea1n mu\u1ed1n nam ch\u00e2m nh\u1eafm v\u00e0o m\u1ed9t khu v\u1ef1c ho\u1eb7c h\u01b0\u1edbng c\u1ee5 th\u1ec3, vi\u1ec7c ch\u1ecdn t\u1ef7 l\u1ec7 ph\u00f9 h\u1ee3p gi\u00fap t\u1ed1i \u01b0u h\u00f3a h\u00ecnh d\u1ea1ng v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a tr\u01b0\u1eddng.<\/li>\n<\/ul>\n<h3>V\u00ed d\u1ee5 th\u1ef1c t\u1ebf v\u1ec1 \u0111i\u1ec1u ch\u1ec9nh t\u1ef7 l\u1ec7 L\/D<\/h3>\n<ul>\n<li>Trong m\u1ed9t tr\u01b0\u1eddng h\u1ee3p, chuy\u1ec3n t\u1eeb t\u1ef7 l\u1ec7 L\/D 0.5 sang 2 tr\u00ean m\u1ed9t nam ch\u00e2m neodymium h\u00ecnh tr\u1ee5 \u0111\u00e3 c\u1ea3i thi\u1ec7n m\u1eadt \u0111\u1ed9 flux trong m\u1ed9t h\u1ec7 th\u1ed1ng c\u1ea3m bi\u1ebfn ch\u1eb7t ch\u1ebd, n\u00e2ng cao \u0111\u1ed9 ch\u00ednh x\u00e1c ph\u00e1t hi\u1ec7n m\u00e0 kh\u00f4ng l\u00e0m t\u0103ng k\u00edch th\u01b0\u1edbc.<\/li>\n<li>M\u1ed9t v\u00ed d\u1ee5 kh\u00e1c cho th\u1ea5y vi\u1ec7c gi\u1ea3m t\u1ef7 l\u1ec7 L\/D tr\u00ean nam ch\u00e2m Alnico \u0111\u00e3 gi\u1ea3m nhi\u1ec5u t\u1eeb trong m\u1ea1ch g\u1ea7n \u0111\u00f3, l\u00e0m h\u1ec7 th\u1ed1ng \u1ed5n \u0111\u1ecbnh h\u01a1n.<\/li>\n<\/ul>\n<h3>Khuy\u1ebfn ngh\u1ecb t\u1eeb c\u00e1c nh\u00e0 cung c\u1ea5p nam ch\u00e2m NBAEM<\/h3>\n<p>NBAEM, m\u1ed9t nh\u00e0 cung c\u1ea5p v\u1eadt li\u1ec7u t\u1eeb n\u1ed5i ti\u1ebfng c\u1ee7a Trung Qu\u1ed1c ph\u1ee5c v\u1ee5 th\u1ecb tr\u01b0\u1eddng Vi\u1ec7t Nam, \u0111\u1ec1 xu\u1ea5t:<\/p>\n<ul>\n<li><strong>Xem x\u00e9t m\u00f4i tr\u01b0\u1eddng \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n v\u00e0 \u0111i\u1ec1u ch\u1ec9nh t\u1ef7 l\u1ec7 L\/D ph\u00f9 h\u1ee3p<\/strong>\u00a0\u0111\u1ec3 c\u00e2n b\u1eb1ng gi\u1eefa kh\u00f4ng gian v\u00e0 \u0111\u1ea7u ra t\u1eeb tr\u01b0\u1eddng.<\/li>\n<li><strong>H\u1ee3p t\u00e1c ch\u1eb7t ch\u1ebd v\u1edbi c\u00e1c nh\u00e0 cung c\u1ea5p<\/strong>\u00a0nh\u01b0 NBAEM \u0111\u1ec3 t\u00f9y ch\u1ec9nh h\u00ecnh d\u1ea1ng nam ch\u00e2m d\u1ef1a tr\u00ean y\u00eau c\u1ea7u v\u1ec1 tr\u01b0\u1eddng v\u00e0 k\u00edch th\u01b0\u1edbc \u0111\u1eb7c th\u00f9 c\u1ee7a b\u1ea1n.<\/li>\n<li><strong>Th\u1eed nghi\u1ec7m c\u00e1c nguy\u00ean m\u1eabu v\u1edbi c\u00e1c t\u1ef7 l\u1ec7 L\/D kh\u00e1c nhau<\/strong>\u00a0\u0111\u1ec3 t\u00ecm ra \u0111i\u1ec3m t\u1ed1i \u01b0u cho thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n.<\/li>\n<\/ul>\n<p>Ch\u1ecdn t\u1ef7 l\u1ec7 L\/D ph\u00f9 h\u1ee3p kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t k\u00edch c\u1ee1 ph\u00f9 h\u1ee3p t\u1ea5t c\u1ea3. \u0110\u00f3 l\u00e0 vi\u1ec7c ph\u00f9 h\u1ee3p h\u00ecnh d\u1ea1ng nam ch\u00e2m v\u1edbi nhu c\u1ea7u th\u1ef1c t\u1ebf c\u1ee7a \u1ee9ng d\u1ee5ng \u0111\u1ec3 \u0111\u1ea1t hi\u1ec7u su\u1ea5t t\u1ed1t nh\u1ea5t.<\/p>\n<h2>K\u1ef9 thu\u1eadt t\u00ednh to\u00e1n v\u00e0 \u0111o l\u01b0\u1eddng t\u1ef7 l\u1ec7 L\/D<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/artseo.cn\/apis\/uploads\/20250806\/LD_Ratio_Measurement_Techniques_Guide_lHr.webp\" alt=\"H\u01b0\u1edbng d\u1eabn k\u1ef9 thu\u1eadt \u0111o l\u01b0\u1eddng T\u1ef7 l\u1ec7 L\/D\" \/><\/p>\n<p>\u0110o t\u1ef7 l\u1ec7 L\/D\u2014t\u1ef7 l\u1ec7 chi\u1ec1u d\u00e0i tr\u00ean \u0111\u01b0\u1eddng k\u00ednh\u2014r\u1ea5t \u0111\u01a1n gi\u1ea3n, nh\u01b0ng vi\u1ec7c l\u00e0m \u0111\u00fang r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi hi\u1ec7u su\u1ea5t c\u1ee7a nam ch\u00e2m c\u1ee7a b\u1ea1n. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1ch th\u1ef1c hi\u1ec7n v\u00e0 c\u00e1c c\u00f4ng c\u1ee5 m\u00e0 c\u00e1c chuy\u00ean gia s\u1eed d\u1ee5ng, \u0111\u1eb7c bi\u1ec7t trong ng\u00e0nh c\u00f4ng nghi\u1ec7p.<\/p>\n<h3>H\u01b0\u1edbng d\u1eabn t\u1eebng b\u01b0\u1edbc \u0111\u1ec3 \u0111o chi\u1ec1u d\u00e0i v\u00e0 \u0111\u01b0\u1eddng k\u00ednh<\/h3>\n<ol>\n<li><strong>\u0110o Chi\u1ec1u D\u00e0i (L)<\/strong>\n<ul>\n<li>S\u1eed d\u1ee5ng th\u01b0\u1edbc c\u1eb7p ho\u1eb7c micrometer \u0111\u1ec3 \u0111o chi\u1ec1u d\u00e0i c\u1ee7a nam ch\u00e2m t\u1eeb \u0111\u1ea7u ph\u1eb3ng n\u00e0y \u0111\u1ebfn \u0111\u1ea7u ph\u1eb3ng kia.<\/li>\n<li>\u0110\u1ea3m b\u1ea3o nam ch\u00e2m th\u1eb3ng v\u00e0 n\u1eb1m ph\u1eb3ng \u0111\u1ec3 c\u00f3 k\u1ebft qu\u1ea3 ch\u00ednh x\u00e1c.<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u0110o \u0110\u01b0\u1eddng K\u00ednh (D)<\/strong>\n<ul>\n<li>\u0110\u1ed1i v\u1edbi nam ch\u00e2m h\u00ecnh tr\u1ee5, \u0111o \u0111\u01b0\u1eddng k\u00ednh qua ph\u1ea7n r\u1ed9ng nh\u1ea5t c\u1ee7a m\u1eb7t tr\u00f2n.<\/li>\n<li>M\u1ed9t l\u1ea7n n\u1eefa, th\u01b0\u1edbc c\u1eb7p l\u00e0 c\u00f4ng c\u1ee5 t\u1ed1t nh\u1ea5t \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 ch\u00ednh x\u00e1c.<\/li>\n<\/ul>\n<\/li>\n<li><strong>T\u00ednh To\u00e1n T\u1ef7 L\u1ec7 L\/D<\/strong>\n<ul>\n<li>Chia chi\u1ec1u d\u00e0i cho \u0111\u01b0\u1eddng k\u00ednh (L \u00f7 D).<\/li>\n<li>V\u00ed d\u1ee5, n\u1ebfu h\u00ecnh tr\u1ee5 c\u1ee7a b\u1ea1n d\u00e0i 20 mm v\u00e0 r\u1ed9ng 10 mm, t\u1ef7 l\u1ec7 L\/D l\u00e0 2.0.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h3>C\u00e1c c\u00f4ng c\u1ee5 v\u00e0 ph\u01b0\u01a1ng ph\u00e1p \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong ng\u00e0nh c\u00f4ng nghi\u1ec7p<\/h3>\n<ul>\n<li><strong>Th\u01b0\u1edbc c\u1eb7p k\u1ef9 thu\u1eadt s\u1ed1<\/strong>: Ph\u1ed5 bi\u1ebfn nh\u1ea5t \u0111\u1ec3 \u0111o chi\u1ec1u d\u00e0i v\u00e0 \u0111\u01b0\u1eddng k\u00ednh nhanh ch\u00f3ng, ch\u00ednh x\u00e1c.<\/li>\n<li><strong>Micrometer<\/strong>: \u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1ea1t \u0111\u1ed9 ch\u00ednh x\u00e1c cao h\u01a1n, \u0111\u1eb7c bi\u1ec7t v\u1edbi k\u00edch th\u01b0\u1edbc nh\u1ecf h\u01a1n.<\/li>\n<li><strong>M\u00e1y \u0111o t\u1ecda \u0111\u1ed9 (CMM)<\/strong>: D\u00e0nh cho c\u00e1c h\u00ecnh d\u1ea1ng ph\u1ee9c t\u1ea1p v\u00e0 s\u1ea3n xu\u1ea5t h\u00e0ng lo\u1ea1t, \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 dung sai ch\u1eb7t ch\u1ebd.<\/li>\n<li><strong>H\u1ec7 th\u1ed1ng \u0111o quang h\u1ecdc<\/strong>: Qu\u00e9t laser gi\u00fap khi l\u00e0m vi\u1ec7c v\u1edbi nam ch\u00e2m m\u1ecfng manh ho\u1eb7c kh\u00f4ng ti\u00eau chu\u1ea9n.<\/li>\n<\/ul>\n<h3>Quy tr\u00ecnh \u0111\u1ea3m b\u1ea3o ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a NBAEM<\/h3>\n<p>NBAEM, nh\u00e0 cung c\u1ea5p v\u1eadt li\u1ec7u t\u1eeb t\u00ednh \u0111\u00e1ng tin c\u1eady t\u1eeb Trung Qu\u1ed1c, tu\u00e2n th\u1ee7 c\u00e1c b\u01b0\u1edbc QA nghi\u00eam ng\u1eb7t \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o k\u00edch th\u01b0\u1edbc nam ch\u00e2m v\u00e0 t\u1ef7 l\u1ec7 L\/D ph\u00f9 h\u1ee3p v\u1edbi y\u00eau c\u1ea7u c\u1ee7a b\u1ea1n:<\/p>\n<ul>\n<li><strong>Ki\u1ec3m tra ban \u0111\u1ea7u<\/strong>: C\u00e1c nam ch\u00e2m th\u00f4 \u0111\u01b0\u1ee3c ki\u1ec3m tra khi s\u1ea3n xu\u1ea5t \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ch\u00ednh x\u00e1c v\u1ec1 k\u00edch th\u01b0\u1edbc.<\/li>\n<li><strong>Ki\u1ec3m tra trong qu\u00e1 tr\u00ecnh<\/strong>: L\u1ea5y m\u1eabu \u0111\u1ecbnh k\u1ef3 trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n.<\/li>\n<li><strong>X\u00e1c nh\u1eadn cu\u1ed1i c\u00f9ng<\/strong>: B\u00e1o c\u00e1o \u0111o l\u01b0\u1eddng chi ti\u1ebft tr\u01b0\u1edbc khi \u0111\u00f3ng g\u00f3i v\u00e0 v\u1eadn chuy\u1ec3n.<\/li>\n<li><strong>T\u00e0i li\u1ec7u<\/strong>: Ch\u1ee9ng ch\u1ec9 v\u00e0 th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt \u0111\u01b0\u1ee3c cung c\u1ea5p \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o minh b\u1ea1ch v\u00e0 truy xu\u1ea5t ngu\u1ed3n g\u1ed1c.<\/li>\n<\/ul>\n<p>\u0110\u1ea3m b\u1ea3o t\u1ef7 l\u1ec7 L\/D ch\u00ednh x\u00e1c c\u00f3 ngh\u0129a l\u00e0 nam ch\u00e2m c\u1ee7a b\u1ea1n c\u00f3 ph\u00e2n b\u1ed1 tr\u01b0\u1eddng t\u1eeb v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 t\u1eeb ph\u00f9 h\u1ee3p cho d\u1ef1 \u00e1n c\u1ee7a b\u1ea1n. D\u00f9 b\u1ea1n \u0111ang l\u00e0m c\u1ea3m bi\u1ebfn, \u0111\u1ed9ng c\u01a1 hay b\u1ea5t k\u1ef3 thi\u1ebft b\u1ecb t\u1eeb t\u00ednh n\u00e0o, ph\u00e9p \u0111o \u0111\u01a1n gi\u1ea3n n\u00e0y gi\u00fap m\u1ecdi th\u1ee9 ho\u1ea1t \u0111\u1ed9ng tr\u01a1n tru.<\/p>\n<h2>Ch\u1ee7 \u0111\u1ec1 n\u00e2ng cao: T\u1ef7 l\u1ec7 L\/D v\u00e0 m\u00f4 h\u00ecnh h\u00f3a tr\u01b0\u1eddng t\u1eeb<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/artseo.cn\/apis\/uploads\/20250806\/LD_Ratio_in_Magnetostatics_Simulation_tTm.webp\" alt=\"T\u1ef7 l\u1ec7 L\/D trong M\u00f4 ph\u1ecfng t\u1eeb t\u00ednh\" \/><\/p>\n<p>T\u1ef7 l\u1ec7 L\/D \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng khi s\u1eed d\u1ee5ng ph\u1ea7n m\u1ec1m m\u00f4 ph\u1ecfng \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a tr\u01b0\u1eddng t\u1eeb. C\u00e1c k\u1ef9 s\u01b0 nh\u1eadp t\u1ef7 l\u1ec7 chi\u1ec1u d\u00e0i tr\u00ean \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a nam ch\u00e2m v\u00e0o c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh t\u1eeb t\u00ednh t\u0129nh \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n c\u00e1ch tr\u01b0\u1eddng t\u1eeb s\u1ebd ph\u00e2n b\u1ed1 v\u00e0 ho\u1ea1t \u0111\u1ed9ng. \u0110i\u1ec1u n\u00e0y gi\u00fap tinh ch\u1ec9nh thi\u1ebft k\u1ebf nam ch\u00e2m tr\u01b0\u1edbc khi t\u1ea1o m\u1eabu v\u1eadt l\u00fd, ti\u1ebft ki\u1ec7m th\u1eddi gian v\u00e0 chi ph\u00ed.<\/p>\n<p>B\u1eb1ng c\u00e1ch \u0111i\u1ec1u ch\u1ec9nh t\u1ef7 l\u1ec7 L\/D trong m\u00f4 ph\u1ecfng, b\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y h\u00ecnh d\u1ea1ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn:<\/p>\n<ul>\n<li>Ph\u00e2n b\u1ed1 m\u1eadt \u0111\u1ed9 flux t\u1eeb<\/li>\n<li>C\u01b0\u1eddng \u0111\u1ed9 v\u00e0 t\u1eadp trung c\u1ee7a tr\u01b0\u1eddng<\/li>\n<li>V\u00f9ng n\u00f3ng ho\u1eb7c v\u00f9ng y\u1ebfu trong nam ch\u00e2m<\/li>\n<\/ul>\n<p>Nh\u1eefng hi\u1ec3u bi\u1ebft n\u00e0y gi\u00fap nh\u00e0 s\u1ea3n xu\u1ea5t t\u1ed1i \u01b0u h\u00f3a nam ch\u00e2m \u0111\u1ec3 \u0111\u1ea1t \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh v\u00e0 hi\u1ec7u qu\u1ea3 t\u1ed1t h\u01a1n t\u00f9y theo \u1ee9ng d\u1ee5ng.<\/p>\n<p>Trong t\u01b0\u01a1ng lai, nghi\u00ean c\u1ee9u t\u1eadp trung nhi\u1ec1u h\u01a1n v\u00e0o c\u00e1ch nh\u1eefng thay \u0111\u1ed5i nh\u1ecf trong t\u1ef7 l\u1ec7 L\/D \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t t\u1eeb t\u00ednh \u1edf quy m\u00f4 nh\u1ecf h\u01a1n. C\u00e1c ti\u1ebfn b\u1ed9 trong c\u00f4ng c\u1ee5 m\u00f4 h\u00ecnh h\u00f3a gi\u00fap d\u1ec5 d\u00e0ng m\u00f4 ph\u1ecfng c\u00e1c h\u00ecnh d\u1ea1ng ph\u1ee9c t\u1ea1p v\u00e0 h\u00e0nh vi v\u1eadt li\u1ec7u, th\u00fac \u0111\u1ea9y \u0111\u1ed5i m\u1edbi trong thi\u1ebft k\u1ebf nam ch\u00e2m qua c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p.<\/p>\n<p>Trong th\u1ecb tr\u01b0\u1eddng Vi\u1ec7t Nam, vi\u1ec7c s\u1eed d\u1ee5ng ph\u1ea7n m\u1ec1m m\u00f4 h\u00ecnh h\u00f3a t\u1ef7 l\u1ec7 L\/D ti\u00ean ti\u1ebfn gi\u00fap b\u1ea1n c\u00f3 nh\u1eefng chi\u1ebfc nam ch\u00e2m ph\u00f9 h\u1ee3p ho\u00e0n h\u1ea3o v\u1edbi nhu c\u1ea7u, n\u00e2ng cao ch\u1ea5t l\u01b0\u1ee3ng v\u00e0 \u0111\u1ed9 tin c\u1eady c\u1ee7a s\u1ea3n ph\u1ea9m.<\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 T\u1ef7 l\u1ec7 L\/D trong nam ch\u00e2m<\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 c\u00e2u h\u1ecfi ph\u1ed5 bi\u1ebfn v\u1ec1 t\u1ef7 l\u1ec7 L\/D trong nam ch\u00e2m, \u0111\u01b0\u1ee3c tr\u1ea3 l\u1eddi r\u00f5 r\u00e0ng \u0111\u1ec3 gi\u00fap c\u1ea3 nh\u00e0 s\u1ea3n xu\u1ea5t v\u00e0 ng\u01b0\u1eddi d\u00f9ng:<\/p>\n<h3>T\u1ef7 l\u1ec7 L\/D trong nam ch\u00e2m c\u00f3 \u00fd ngh\u0129a g\u00ec?<\/h3>\n<p>T\u1ef7 l\u1ec7 L\/D \u0111\u1ea1i di\u1ec7n cho t\u1ef7 l\u1ec7 chi\u1ec1u d\u00e0i so v\u1edbi \u0111\u01b0\u1eddng k\u00ednh. N\u00f3 th\u1ec3 hi\u1ec7n t\u1ef7 l\u1ec7 gi\u1eefa chi\u1ec1u d\u00e0i v\u00e0 \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a nam ch\u00e2m, \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi nam ch\u00e2m h\u00ecnh tr\u1ee5.<\/p>\n<h3>T\u1ea1i sao t\u1ef7 l\u1ec7 L\/D l\u1ea1i quan tr\u1ecdng \u0111\u1ed1i v\u1edbi hi\u1ec7u su\u1ea5t t\u1eeb tr\u01b0\u1eddng?<\/h3>\n<p>T\u1ef7 l\u1ec7 L\/D \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn h\u00ecnh d\u1ea1ng v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a tr\u01b0\u1eddng t\u1eeb. M\u1ed9t t\u1ef7 l\u1ec7 L\/D cao ho\u1eb7c th\u1ea5p c\u00f3 th\u1ec3 thay \u0111\u1ed5i m\u1eadt \u0111\u1ed9 flux, \u0111\u1ed9 c\u01b0\u1ee1ng t\u1eeb v\u00e0 hi\u1ec7u qu\u1ea3 t\u1ed5ng th\u1ec3.<\/p>\n<h3>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 t\u00f4i t\u00ednh to\u00e1n t\u1ef7 l\u1ec7 L\/D cho nam ch\u00e2m c\u1ee7a m\u00ecnh?<\/h3>\n<p>\u0110o chi\u1ec1u d\u00e0i v\u00e0 \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a nam ch\u00e2m b\u1eb1ng th\u01b0\u1edbc c\u1eb7p, sau \u0111\u00f3 chia chi\u1ec1u d\u00e0i cho \u0111\u01b0\u1eddng k\u00ednh. V\u00ed d\u1ee5, n\u1ebfu chi\u1ec1u d\u00e0i = 20 mm v\u00e0 \u0111\u01b0\u1eddng k\u00ednh = 10 mm, th\u00ec L\/D = 2.<\/p>\n<h3>T\u1ef7 l\u1ec7 L\/D c\u00f3 \u1ea3nh h\u01b0\u1edfng nh\u01b0 nhau \u0111\u1ebfn t\u1ea5t c\u1ea3 c\u00e1c lo\u1ea1i nam ch\u00e2m kh\u00f4ng?<\/h3>\n<p>Kh\u00f4ng. V\u00ed d\u1ee5, nam ch\u00e2m Neodymium c\u00f3 th\u1ec3 c\u1ea7n c\u00e1c thi\u1ebft l\u1eadp L\/D kh\u00e1c so v\u1edbi nam ch\u00e2m Alnico ho\u1eb7c Ferrite, t\u00f9y thu\u1ed9c v\u00e0o \u0111\u1eb7c t\u00ednh t\u1eeb tr\u01b0\u1eddng v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3 c\u1ee7a ch\u00fang.<\/p>\n<h3>T\u00f4i c\u00f3 th\u1ec3 thay \u0111\u1ed5i t\u1ef7 l\u1ec7 L\/D \u0111\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t nam ch\u00e2m kh\u00f4ng?<\/h3>\n<p>C\u00f3. \u0110i\u1ec1u ch\u1ec9nh t\u1ef7 l\u1ec7 L\/D c\u00f3 th\u1ec3 t\u1ed1i \u01b0u h\u00f3a ph\u00e2n b\u1ed1 v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng t\u1eeb cho m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng c\u1ee7a b\u1ea1n, nh\u01b0 c\u1ea3m bi\u1ebfn, \u0111\u1ed9ng c\u01a1 ho\u1eb7c thi\u1ebft b\u1ecb gi\u1eef ch\u1eb7t.<\/p>\n<h3>C\u00e1c c\u00f4ng c\u1ee5 n\u00e0o \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb \u0111\u1ec3 \u0111o ch\u00ednh x\u00e1c t\u1ef7 l\u1ec7 L\/D?<\/h3>\n<p>Th\u01b0\u1edbc c\u1eb7p k\u1ef9 thu\u1eadt s\u1ed1 ho\u1eb7c micromet cung c\u1ea5p c\u00e1c ph\u00e9p \u0111o ch\u00ednh x\u00e1c. Vi\u1ec7c \u0111o l\u01b0\u1eddng nh\u1ea5t qu\u00e1n l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o c\u00e1c th\u00f4ng s\u1ed1 t\u1eeb tr\u01b0\u1eddng ph\u00f9 h\u1ee3p v\u1edbi y\u00eau c\u1ea7u thi\u1ebft k\u1ebf.<\/p>\n<p><strong>C\u00f3 m\u1eb9o kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 n\u00e0o n\u1ebfu nam ch\u00e2m c\u1ee7a t\u00f4i kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng nh\u01b0 mong \u0111\u1ee3i kh\u00f4ng?<\/strong><\/p>\n<ul>\n<li>Ki\u1ec3m tra xem t\u1ef7 l\u1ec7 L\/D c\u00f3 ph\u00f9 h\u1ee3p v\u1edbi th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt thi\u1ebft k\u1ebf kh\u00f4ng<\/li>\n<li>X\u00e1c nh\u1eadn kh\u00f4ng c\u00f3 l\u1ed7i s\u1ea3n xu\u1ea5t n\u00e0o l\u00e0m thay \u0111\u1ed5i h\u00ecnh d\u1ea1ng<\/li>\n<li>Th\u1eed nghi\u1ec7m c\u00e1c \u0111\u1eb7c t\u00ednh t\u1eeb tr\u01b0\u1eddng d\u01b0\u1edbi \u0111i\u1ec1u ki\u1ec7n ho\u1ea1t \u0111\u1ed9ng th\u1ef1c t\u1ebf<\/li>\n<li>Tham kh\u1ea3o \u00fd ki\u1ebfn nh\u00e0 cung c\u1ea5p nh\u01b0 NBAEM \u0111\u1ec3 \u0111\u01b0\u1ee3c h\u01b0\u1edbng d\u1eabn v\u1ec1 k\u00edch th\u01b0\u1edbc nam ch\u00e2m l\u00fd t\u01b0\u1edfng<\/li>\n<\/ul>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam chi ti\u1ebft v\u1ec1 t\u1ef7 l\u1ec7 L\/D v\u00e0 thi\u1ebft k\u1ebf nam ch\u00e2m, h\u00e3y truy c\u1eadp trang c\u1ee7a ch\u00fang t\u00f4i\u00a0<a href=\"https:\/\/nbaem.com\/vi\/whats-ld-ratio-in-magnet\/\">T\u1ef7 l\u1ec7 L\/D trong Nam ch\u00e2m<\/a>.<\/p>\n<p>N\u1ebfu b\u1ea1n \u0111ang kh\u00e1m ph\u00e1 c\u00e1ch h\u00ecnh d\u1ea1ng nam ch\u00e2m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf, h\u00e3y xem c\u00e1c hi\u1ec3u bi\u1ebft c\u1ee7a ch\u00fang t\u00f4i v\u1ec1\u00a0<a href=\"https:\/\/nbaem.com\/vi\/market-growth-and-innovationmagnetic-material-demand-market-conferences-elevator-traction-machinessmall-scale-wind-power-generation\/\">nhu c\u1ea7u v\u1eadt li\u1ec7u t\u1eeb v\u00e0 \u0111\u1ed5i m\u1edbi<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Kh\u00e1m ph\u00e1 \u00fd ngh\u0129a c\u1ee7a t\u1ef7 l\u1ec7 chi\u1ec1u d\u00e0i\/\u0111\u01b0\u1eddng k\u00ednh (L\/D) trong nam ch\u00e2m v\u00e0 c\u00e1ch t\u1ef7 l\u1ec7 chi\u1ec1u d\u00e0i so v\u1edbi \u0111\u01b0\u1eddng k\u00ednh \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u01b0\u1eddng \u0111\u1ed9 t\u1eeb v\u00e0 hi\u1ec7u su\u1ea5t trong c\u00e1c \u1ee9ng d\u1ee5ng kh\u00e1c nhau.<\/p>","protected":false},"author":1,"featured_media":1778,"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-1779","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"jetpack_featured_media_url":"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/08\/LD_Ratio_Impact_on_Magnet_Performance_eNx.webp","_links":{"self":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1779","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=1779"}],"version-history":[{"count":3,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1779\/revisions"}],"predecessor-version":[{"id":1816,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1779\/revisions\/1816"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media\/1778"}],"wp:attachment":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media?parent=1779"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/categories?post=1779"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/tags?post=1779"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}