{"id":3640,"date":"2026-01-15T09:50:34","date_gmt":"2026-01-15T09:50:34","guid":{"rendered":"https:\/\/nbaem.com\/?p=3640"},"modified":"2026-01-15T01:41:03","modified_gmt":"2026-01-15T01:41:03","slug":"what-is-the-strength-of-the-halbach-array-magnet-field","status":"publish","type":"post","link":"https:\/\/nbaem.com\/vi\/what-is-the-strength-of-the-halbach-array-magnet-field\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn C\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng Halbach Array \u2013 Tesla, Gauss Gi\u1ea3i th\u00edch"},"content":{"rendered":"<h2>Halbach Array l\u00e0 g\u00ec? T\u1ed5ng quan nhanh<\/h2>\n<p>Ban \u0111\u1ea7u \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n b\u1edfi nh\u00e0 v\u1eadt l\u00fd Klaus Halbach v\u00e0o th\u1eadp ni\u00ean 1980 \u0111\u1ec3 t\u1eadp trung ch\u00f9m trong gia t\u1ed1c gia t\u1ed1c,<a href=\"https:\/\/en.wikipedia.org\/wiki\/Halbach_array\" target=\"_blank\" rel=\"noopener\"> <strong>M\u1ea3ng Halbach<\/strong> <\/a>l\u00e0 m\u1ed9t s\u1eafp x\u1ebfp \u0111\u1eb7c bi\u1ec7t c\u1ee7a nam ch\u00e2m v\u0129nh c\u1eedu \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh l\u01b0u l\u01b0\u1ee3ng t\u1eeb tr\u01b0\u1eddng nh\u1eb1m \u0111\u1ea1t hi\u1ec7u qu\u1ea3 t\u1ed1i \u0111a. Kh\u00e1c v\u1edbi c\u00e1c t\u1ed5 h\u1ee3p nam ch\u00e2m ti\u00eau chu\u1ea9n n\u01a1i c\u1ef1c t\u1eeb ch\u1ec9 lu\u00e2n phi\u00ean, Halbach array utilizes m\u1ed9t m\u1eabu quay kh\u00f4ng gian.<\/p>\n<p>B\u1eb1ng c\u00e1ch quay h\u01b0\u1edbng t\u1eeb h\u00f3a c\u1ee7a m\u1ed7i \u0111o\u1ea1n k\u1ebf ti\u1ebfp 90\u00b0, ch\u00fang ta t\u1ea1o ra m\u1ed9t t\u01b0\u01a1ng t\u00e1c \u0111\u1ed9c \u0111\u00e1o gi\u1eefa c\u00e1c tr\u01b0\u1eddng t\u1eeb:<\/p>\n<ul>\n<li><strong>Giao thoa h\u1eefu \u00edch:<\/strong> \u1ede ph\u00eda \u201cho\u1ea1t \u0111\u1ed9ng\u201d, c\u00e1c tr\u01b0\u1eddng k\u1ebft h\u1ee3p l\u1ea1i, khu\u1ebfch \u0111\u1ea1i \u0111\u00e1ng k\u1ec3 <strong>gi\u00e1 tr\u1ecb m\u1eadt \u0111\u1ed9 flux t\u1eeb<\/strong>.<\/li>\n<li><strong>Giao thoa h\u1ee7y b\u1ecf:<\/strong> \u1ede ph\u00eda \u0111\u1ed1i di\u1ec7n \u201cy\u00ean t\u0129nh\u201d, c\u00e1c tr\u01b0\u1eddng tri\u1ec7t ti\u00eau l\u1eabn nhau, g\u00e2y ra tr\u01b0\u1eddng t\u1eeb g\u1ea7n nh\u01b0 b\u1eb1ng 0.<\/li>\n<\/ul>\n<p>Trong khi c\u00e1c m\u00f4 h\u00ecnh l\u00fd thuy\u1ebft th\u01b0\u1eddng cho th\u1ea5y s\u1ef1 t\u0103ng g\u1ea5p \u0111\u00f4i c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng, v\u1eadt l\u00fd th\u1ef1c t\u1ebf c\u00f3 m\u1ed9t s\u1ed1 t\u1ed5n th\u1ea5t. Trong kinh nghi\u1ec7m s\u1ea3n xu\u1ea5t t\u1ea1i NBAEM, m\u1ed9t <strong>m\u1ea3ng Halbach neodymium<\/strong> th\u01b0\u1eddng cung c\u1ea5p s\u1ef1 t\u0103ng c\u01b0\u1eddng tr\u01b0\u1eddng th\u1ef1c t\u1ebf t\u1eeb <strong>1.4x \u0111\u1ebfn 1.8x<\/strong> so v\u1edbi m\u1ed9t nam ch\u00e2m th\u00f4ng th\u01b0\u1eddng c\u00f9ng th\u1ec3 t\u00edch. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p c\u00e1c k\u1ef9 s\u01b0 \u0111\u1ea1t hi\u1ec7u su\u1ea5t cao h\u01a1n m\u00e0 kh\u00f4ng l\u00e0m t\u0103ng tr\u1ecdng l\u01b0\u1ee3ng h\u1ec7 th\u1ed1ng.<\/p>\n<h2>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u0111o l\u1ef1c tr\u01b0\u1eddng c\u1ee7a nam ch\u00e2m Halbach Array?<\/h2>\n<p>Khi ch\u00fang t\u00f4i thi\u1ebft k\u1ebf gi\u1ea3i ph\u00e1p t\u1ea1i NBAEM, \u0111\u1ecbnh l\u01b0\u1ee3ng s\u1ee9c m\u1ea1nh c\u1ee7a m\u1ed9t <strong>C\u1ea3m bi\u1ebfn t\u1eeb Halbach<\/strong> l\u00e0 b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t. C\u00e1c \u0111\u01a1n v\u1ecb ti\u00eau chu\u1ea9n trong ng\u00e0nh cho c\u00e1c \u0111o l\u01b0\u1eddng n\u00e0y l\u00e0 Tesla (T) v\u00e0 Gauss (G), v\u1edbi m\u1ed9t h\u1ec7 s\u1ed1 chuy\u1ec3n \u0111\u1ed5i \u0111\u01a1n gi\u1ea3n: <strong>1 Tesla b\u1eb1ng 10.000 Gauss<\/strong>. Trong khi nam ch\u00e2m N54 ti\u00eau chu\u1ea9n c\u00f3 s\u1ea3n ph\u1ea9m n\u0103ng l\u01b0\u1ee3ng t\u1ed1i \u0111a c\u1ed1 \u0111\u1ecbnh, vi\u1ec7c s\u1eafp x\u1ebfp n\u00f3 th\u00e0nh c\u1ea5u h\u00ecnh Halbach l\u00e0m thay \u0111\u1ed5i \u0111\u00e1ng k\u1ec3 c\u00e1ch ch\u00fang ta \u0111\u1ecdc c\u00e1c gi\u00e1 tr\u1ecb n\u00e0y do t\u00e1c \u0111\u1ed9ng t\u1eadp trung flux.<\/p>\n<p>\u0110\u00e1nh gi\u00e1 hi\u1ec7u qu\u1ea3 c\u1ee7a m\u1ed9t m\u1ea3ng, ch\u00fang ta t\u1eadp trung v\u00e0o m\u1ed9t s\u1ed1 ch\u1ec9 s\u1ed1 ch\u00ednh t\u00f9y thu\u1ed9c v\u00e0o \u1ee9ng d\u1ee5ng cu\u1ed1i c\u00f9ng:<\/p>\n<ul>\n<li><strong>Tr\u01b0\u1eddng b\u1ec1 m\u1eb7t:<\/strong> C\u01b0\u1eddng \u0111\u1ed9 t\u1eeb tr\u01b0\u1eddng \u0111o tr\u1ef1c ti\u1ebfp tr\u00ean m\u1eb7t \u201cho\u1ea1t \u0111\u1ed9ng\u201d c\u1ee7a t\u1ed5 h\u1ee3p.<\/li>\n<li><strong>M\u1eadt \u0111\u1ed9 t\u1eeb th\u00f4ng khe h\u1edf:<\/strong> \u0110\u1ed9 m\u1ea1nh c\u1ee7a tr\u01b0\u1eddng t\u1ea1i m\u1ed9t kho\u1ea3ng c\u00e1ch c\u1ee5 th\u1ec3 t\u1eeb b\u1ec1 m\u1eb7t, \u0111i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng cho c\u00e1c roto \u0111\u1ed9ng c\u01a1 v\u00e0 m\u00e1y ph\u00e1t.<\/li>\n<li><strong>Gi\u00e1 tr\u1ecb Trung t\u00e2m \u0110\u1ec9nh:<\/strong> \u0110\u1ed1i v\u1edbi c\u00e1c thi\u1ebft k\u1ebf h\u00ecnh tr\u1ee5, \u0111i\u1ec1u n\u00e0y \u0111o l\u01b0\u1eddng c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng t\u1ed1i \u0111a b\u00ean trong l\u1ed7.<\/li>\n<li><strong>L\u1ef1c h\u00fat:<\/strong> \u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng ch\u1ee7 y\u1ebfu cho c\u00e1c \u1ee9ng d\u1ee5ng k\u1eb9p ho\u1eb7c gi\u1eef \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 b\u00e1m c\u01a1 h\u1ecdc.<\/li>\n<\/ul>\n<p>R\u1ea5t quan tr\u1ecdng \u0111\u1ec3 hi\u1ec3u s\u1ef1 ph\u00e2n bi\u1ec7t k\u1ef9 thu\u1eadt gi\u1eefa t\u1ed5ng <a href=\"https:\/\/nbaem.com\/vi\/magnetic-flux-and-surface-gauss\/\" target=\"_blank\" rel=\"noopener\">Flux t\u1eeb tr\u01b0\u1eddng v\u00e0 gauss b\u1ec1 m\u1eb7t<\/a> \u0111\u1ea3m b\u1ea3o khung l\u1eafp r\u00e1p \u0111\u00e1p \u1ee9ng \u0111\u00fang y\u00eau c\u1ea7u m\u00f4-men xo\u1eafn ho\u1eb7c gi\u1eef c\u1ee7a b\u1ea1n. T\u1ea1i c\u01a1 s\u1edf c\u1ee7a ch\u00fang t\u00f4i, ch\u00fang t\u00f4i ki\u1ec3m tra c\u00e1c th\u00f4ng s\u1ed1 n\u00e0y b\u1eb1ng c\u00e1c Gaussmeter ch\u00ednh x\u00e1c cho d\u1eef li\u1ec7u \u0111i\u1ec3m v\u00e0 phim quan s\u00e1t t\u1eeb tr\u01b0\u1eddng \u0111\u1ec3 h\u00ecnh dung m\u00f4 h\u00ecnh t\u1eeb l\u01b0\u1ee3ng t\u1eeb t\u00ednh hai m\u1eb7t. \u0110\u1ed1i v\u1edbi c\u00e1c d\u1ef1 \u00e1n t\u00f9y ch\u1ec9nh ph\u1ee9c t\u1ea1p, ch\u00fang t\u00f4i s\u1eed d\u1ee5ng c\u00e1c m\u00f4 ph\u1ecfng Ph\u00e2n t\u00edch y\u1ebfu t\u1ed1 h\u1eefu h\u1ea1n (FEA) ti\u00ean ti\u1ebfn \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n <strong>h\u1ec7 Halbach flux<\/strong> v\u00e0 t\u1ed1i \u01b0u h\u00f3a h\u00ecnh h\u1ecdc tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u s\u1ea3n xu\u1ea5t.<\/p>\n<h2>C\u00e1c gi\u00e1 tr\u1ecb \u0111\u1ed9 m\u1ea1nh \u0111i\u1ec3n h\u00ecnh cho tr\u01b0\u1eddng magnet Halbach<\/h2>\n<p>T\u1ea1i NBAEM, ch\u00fang t\u00f4i thi\u1ebft k\u1ebf c\u00e1c t\u1ed5 h\u1ee3p t\u1eeb t\u00ednh \u0111\u1ec3 t\u1ed1i \u0111a h\u00f3a hi\u1ec7u su\u1ea5t tr\u00ean m\u1ed7i th\u1ec3 t\u00edch. M\u1ed9t ti\u00eau chu\u1ea9n <strong>C\u1ea3m bi\u1ebfn t\u1eeb Halbach<\/strong> th\u01b0\u1eddng \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1eadt \u0111\u1ed9 t\u1eeb <strong>t\u1eeb 1,4 \u0111\u1ebfn g\u1ea5p 2 l\u1ea7n m\u1ea1nh h\u01a1n<\/strong> \u1edf ph\u00eda ho\u1ea1t \u0111\u1ed9ng so v\u1edbi c\u00e1ch b\u1ed1 tr\u00ed nam ch\u00e2m th\u00f4ng th\u01b0\u1eddng b\u1eb1ng c\u00f9ng l\u01b0\u1ee3ng v\u1eadt li\u1ec7u. Trong khi m\u1ed9t nam ch\u00e2m v\u0129nh c\u1eedu ti\u00eau chu\u1ea9n c\u00f3 th\u1ec3 g\u1eb7p kh\u00f3 kh\u0103n trong vi\u1ec7c chi\u1ebfu m\u1ed9t tr\u01b0\u1eddng s\u00e2u, <strong>h\u1ec7 Halbach flux<\/strong> \u0111\u01b0\u1ee3c t\u1eadp trung ch\u00ednh x\u00e1c t\u1ea1i n\u01a1i \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n c\u1ea7n<\/p>\n<h3>Ph\u1ea1m vi c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng th\u1ef1c t\u1ebf<\/h3>\n<p>C\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c ph\u1ee5 thu\u1ed9c n\u1eb7ng v\u00e0o h\u00ecnh h\u1ecdc v\u00e0 lo\u1ea1i v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng, nh\u01b0 Neodymium sintered N55 c\u1ee7a ch\u00fang t\u00f4i. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 b\u1ea3ng ph\u00e2n t\u00edch c\u00e1c gi\u00e1 tr\u1ecb \u0111i\u1ec3n h\u00ecnh m\u00e0 ch\u00fang t\u00f4i th\u1ea5y trong c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p:<\/p>\n<ul>\n<li><strong>M\u1ea3ng nh\u1ecf &amp; DIY:<\/strong> <strong>0.2 T \u2013 0.8 T<\/strong> (2.000 \u2013 8.000 Gauss). Th\u01b0\u1eddng g\u1eb7p trong c\u00e1c thi\u1ebft b\u1ecb gi\u1eef \u0111\u01a1n gi\u1ea3n d\u00f9ng kh\u1ed1i N35 chu\u1ea9n.<\/li>\n<li><strong>M\u1ea3ng \u0110\u1ed3 th\u1ecb C\u01a1 h\u1ecdc C\u00f4ng nghi\u1ec7p theo D\u00f2ng v\u00e0 theo V\u00f2ng tr\u00f2n:<\/strong> <strong>1.0 T \u2013 1.5 T<\/strong> (10.000 \u2013 15.000 Gauss). \u0110\u00e2y l\u00e0 chu\u1ea9n cho rotor \u0111\u1ed9ng c\u01a1 hi\u1ec7u su\u1ea5t cao v\u00e0 c\u01a1 c\u1ea5u truy\u1ec1n \u0111\u1ed9ng tuy\u1ebfn t\u00ednh c\u1ee7a ch\u00fang t\u00f4i.<\/li>\n<li><strong>C\u00e1c B\u1ed9 l\u1eafp Cylindrical N\u00e2ng cao:<\/strong> <strong>1.5 T \u2013 2.0 T+<\/strong>. B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng h\u00ecnh h\u1ecdc t\u1ed1i \u01b0u v\u00e0 v\u1eadt li\u1ec7u ch\u1ea5t l\u01b0\u1ee3ng cao, ch\u00fang t\u00f4i c\u00f3 th\u1ec3 \u0111\u1ea9y gi\u1edbi h\u1ea1n cho nghi\u00ean c\u1ee9u chuy\u00ean s\u00e2u ho\u1eb7c y\u00eau c\u1ea7u m\u1eadt \u0111\u1ed9 m\u00f4-men xo\u1eafn cao.<\/li>\n<li><strong>C\u00e1c Thi\u1ebft k\u1ebf T\u1ed1i \u01b0u tr\u01b0\u1eddng t\u1eeb<\/strong> <strong>4.0 T \u2013 5.0 T<\/strong>. Nh\u1eefng gi\u00e1 tr\u1ecb c\u1ef1c \u0111oan n\u00e0y c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c trong c\u00e1c c\u1ea5u h\u00ecnh c\u1ea7u ho\u1eb7c dipole c\u1ef1c k\u1ef3 \u0111\u1eb7c bi\u1ec7t, th\u01b0\u1eddng y\u00eau c\u1ea7u <a href=\"https:\/\/nbaem.com\/vi\/what-is-high-performance-smco-magnets\/\" target=\"_blank\" rel=\"noopener\">nam ch\u00e2m SmCo hi\u1ec7u su\u1ea5t cao<\/a> \u0111\u1ec3 duy tr\u00ec \u1ed5n \u0111\u1ecbnh d\u01b0\u1edbi s\u1ef1 c\u0103ng th\u1eb3ng t\u1eeb t\u1eeb tr\u01b0\u1eddng nh\u01b0 v\u1eady.<\/li>\n<\/ul>\n<h3>So s\u00e1nh: Th\u00f4ng th\u01b0\u1eddng so v\u1edbi M\u1ea3ng Halbach<\/h3>\n<p>\u0110\u1ec3 hi\u1ec3u s\u1ef1 t\u0103ng hi\u1ec7u su\u1ea5t, ch\u00fang ta h\u00e3y so s\u00e1nh b\u1ed1 tr\u00ed c\u1ef1c xen k\u1ebd ti\u00eau chu\u1ea9n v\u1edbi m\u1ed9t <strong>m\u1ea3ng Halbach Neodymium<\/strong>.<\/p>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: left;\">\u0110\u1eb7c \u0111i\u1ec3m<\/th>\n<th style=\"text-align: left;\">L\u1eafp gh\u00e9p Nam ch\u00e2m Th\u00f4ng th\u01b0\u1eddng<\/th>\n<th style=\"text-align: left;\">C\u1ea5u h\u00ecnh M\u1ea3ng Halbach<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: left;\"><strong>Tr\u01b0\u1eddng b\u1ec1 m\u1eb7t t\u01b0\u01a1ng \u0111\u1ed1i<\/strong><\/td>\n<td style=\"text-align: left;\">C\u01a1 s\u1edf (1.0x)<\/td>\n<td style=\"text-align: left;\"><strong>T\u0103ng c\u01b0\u1eddng 1,4x \u2013 2,0x<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>R\u00f2 r\u1ec9 tr\u01b0\u1eddng<\/strong><\/td>\n<td style=\"text-align: left;\">Cao (Y\u00eau c\u1ea7u khung sau n\u1eb7ng)<\/td>\n<td style=\"text-align: left;\"><strong>G\u1ea7n b\u1eb1ng 0<\/strong> (T\u1ef1 b\u1ea3o v\u1ec7)<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Tr\u1ecdng l\u01b0\u1ee3ng h\u1ec7 th\u1ed1ng<\/strong><\/td>\n<td style=\"text-align: left;\">N\u1eb7ng (Do che ch\u1eafn b\u1eb1ng s\u1eaft)<\/td>\n<td style=\"text-align: left;\"><strong>Nh\u1eb9<\/strong> (~20% gi\u1ea3m)<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Hi\u1ec7u qu\u1ea3 v\u1eadt li\u1ec7u<\/strong><\/td>\n<td style=\"text-align: left;\">Ti\u00eau chu\u1ea9n<\/td>\n<td style=\"text-align: left;\">Cao (Nhi\u1ec1u flux, \u00edt kh\u1ed1i l\u01b0\u1ee3ng)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>B\u1eb1ng c\u00e1ch t\u1eadp trung n\u0103ng l\u01b0\u1ee3ng t\u1eeb t\u00ednh v\u00e0o m\u1ed9t m\u1eb7t nh\u1eb1m lo\u1ea1i b\u1ecf nhu c\u1ea7u s\u1eed d\u1ee5ng t\u1ea5m l\u01b0ng th\u00e9p n\u1eb7ng, ch\u00fang ta t\u1ea1o ra m\u1ed9t h\u1ec7 th\u1ed1ng nh\u1eb9 h\u01a1n v\u00e0 mang l\u1ea1i hi\u1ec7u su\u1ea5t v\u01b0\u1ee3t tr\u1ed9i <strong>M\u1ea3ng Halbach Tesla<\/strong> gi\u00e1 tr\u1ecb, tr\u1edf th\u00e0nh l\u1ef1a ch\u1ecdn \u01b0u ti\u00ean cho robotics hi\u1ec7n \u0111\u1ea1i, \u0111\u1ed9ng c\u01a1 \u00f4 t\u00f4, v\u00e0 c\u00e1c thi\u1ebft b\u1ecb y t\u1ebf chu\u1ea9n x\u00e1c.<\/p>\n<h2>C\u00e1c y\u1ebfu t\u1ed1 x\u00e1c \u0111\u1ecbnh c\u01b0\u1eddng \u0111\u1ed9 t\u1eeb tr\u01b0\u1eddng c\u1ee7a m\u1ea3ng Halbach<\/h2>\n<p>Khi kh\u00e1ch h\u00e0ng cho ch\u00fang t\u00f4i h\u1ecfi <strong>\u0111\u1ed9 m\u1ea1nh tr\u01b0\u1eddng c\u1ee7a\u1eeb Halbach array nam ch\u00e2m<\/strong> s\u1ebd d\u00e0nh cho \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3 c\u1ee7a h\u1ecd, c\u00e2u tr\u1ea3 l\u1eddi kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t s\u1ed1 c\u1ed1 \u0111\u1ecbnh duy nh\u1ea5t. N\u00f3 ph\u1ee5 thu\u1ed9c v\u00e0o s\u1ef1 k\u1ebft h\u1ee3p ch\u00ednh x\u00e1c gi\u1eefa khoa h\u1ecdc v\u1eadt li\u1ec7u v\u00e0 k\u1ef9 thu\u1eadt h\u00ecnh h\u1ecdc. V\u00e0i bi\u1ebfn quan tr\u1ecdng quy\u1ebft \u0111\u1ecbnh c\u00e1c m\u1ee9c Tesla ho\u1eb7c Gauss cu\u1ed1i c\u00f9ng m\u00e0 ch\u00fang ta c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c.<\/p>\n<h3>L\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u nam ch\u00e2m<\/h3>\n<p>N\u1ec1n t\u1ea3ng c\u1ee7a b\u1ea5t k\u1ef3 m\u1ea3ng hi\u1ec7u su\u1ea5t cao n\u00e0o c\u0169ng l\u00e0 nguy\u00ean li\u1ec7u th\u00f4. A <strong>m\u1ea3ng Halbach neodymium<\/strong> \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng v\u1edbi sintered NdFeB c\u1ea5p N52 ho\u1eb7c N55 s\u1ebd t\u1ef1 nhi\u00ean cho m\u1eadt \u0111\u1ed9 t\u1eeb d\u01b0 cao h\u01a1n \u0111\u00e1ng k\u1ec3 ($B_r$) so v\u1edbi lo\u1ea1i l\u00e0m t\u1eeb N35 ti\u00eau chu\u1ea9n.<\/p>\n<ul>\n<li><strong>Neodymium (NdFeB):<\/strong> T\u1ed1t nh\u1ea5t cho s\u1ee9c m\u1ea1nh \u1edf nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng t\u1ed1i \u0111a.<\/li>\n<li><strong>Samarium Cobalt (SmCo):<\/strong> Thi\u1ebft y\u1ebfu cho s\u1ef1 \u1ed5n \u0111\u1ecbnh \u1edf nhi\u1ec7t \u0111\u1ed9 cao, though slightly weaker than top-tier Neo.<\/li>\n<\/ul>\n<p>Hi\u1ec3u bi\u1ebft <a href=\"https:\/\/nbaem.com\/vi\/what-are-magnets-made-of\/\" target=\"_blank\" rel=\"noopener\">nam ch\u00e2m l\u00e0m b\u1eb1ng g\u00ec<\/a> l\u00e0 b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean \u0111\u1ec3 c\u00e2n b\u1eb1ng chi ph\u00ed v\u1edbi s\u1ee9c m\u1ea1nh t\u1eeb t\u00ednh th\u00f4 c\u1ea7n cho d\u1ef1 \u00e1n c\u1ee7a b\u1ea1n.<\/p>\n<h3>H\u00ecnh h\u1ecdc v\u00e0 C\u1ea5u h\u00ecnh<\/h3>\n<p>C\u00e1ch b\u1ed1 tr\u00ed v\u1eadt l\u00fd \u0111\u00f3ng vai tr\u00f2 l\u1edbn trong s\u1ef1 t\u1eadp trung flux.<\/p>\n<ul>\n<li><strong>D\u1ea3i tuy\u1ebfn t\u00ednh so v\u1edbi h\u00ecnh tr\u1ee5:<\/strong> M\u1ed9t m\u1ea3ng tuy\u1ebfn t\u00ednh t\u1eadp trung flux v\u00e0o m\u1ed9t m\u1eb7t ph\u1eb3ng, trong khi m\u1ed9t <strong>\u0111i\u1ec3m tr\u01b0\u1eddng Halbach h\u00ecnh tr\u1ee5<\/strong> \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi t\u1ef7 l\u1ec7 \u0111\u01b0\u1eddng k\u00ednh ngo\u00e0i v\u1edbi \u0111\u01b0\u1eddng k\u00ednh trong. C\u00e1c th\u00e0nh magnet d\u00e0y h\u01a1n th\u01b0\u1eddng t\u1ea1o tr\u01b0\u1eddng b\u00ean trong m\u1ea1nh h\u01a1n.<\/li>\n<li><strong>S\u1ed1 l\u01b0\u1ee3ng Segment:<\/strong> An <strong>thi\u1ebft k\u1ebf Halbach t\u1ed1i \u01b0u<\/strong> \u01b0\u1edbc l\u01b0\u1ee3ng m\u1ed9t vect\u01a1 t\u1eeb tr\u01b0\u1eddng li\u00ean t\u1ee5c quay. S\u1eed d\u1ee5ng nhi\u1ec1u segment r\u1eddi r\u1ea1c h\u01a1n cho m\u1ed7i c\u1ef1c (v\u00ed d\u1ee5 8 ho\u1eb7c 12 segment thay v\u00ec ch\u1ec9 4) t\u1ea1o ra tr\u01b0\u1eddng m\u01b0\u1ee3t h\u01a1n v\u00e0 \u0111\u1ea9y c\u01b0\u1eddng \u0111\u1ed9 \u0111\u1ec9nh g\u1ea7n gi\u1edbi h\u1ea1n l\u00fd thuy\u1ebft.<\/li>\n<\/ul>\n<h3>K\u00edch th\u01b0\u1edbc v\u00e0 Kho\u1ea3ng kh\u00f4ng kh\u00ed<\/h3>\n<p>\u0110\u1ed9 m\u1ea1nh c\u1ee7a tr\u01b0\u1eddng t\u1eeb gi\u1ea3m theo \u0111\u1ecbnh l\u00fd b\u00ecnh ph\u01b0\u01a1ng ngh\u1ecbch\u2014n\u00f3 gi\u1ea3m nhanh khi b\u1ea1n t\u0103ng kho\u1ea3ng c\u00e1ch t\u1eeb b\u1ec1 m\u1eb7t.<\/p>\n<ul>\n<li><strong>Kho\u1ea3ng h\u1edf t\u1eeb (Air Gap):<\/strong> Kho\u1ea3ng c\u00e1ch gi\u1eefa m\u1eb7t nam ch\u00e2m v\u00e0 m\u1ee5c ti\u00eau (stator, c\u1ea3m bi\u1ebfn ho\u1eb7c ch\u00f9m) ph\u1ea3i \u0111\u01b0\u1ee3c t\u1ed1i thi\u1ec3u h\u00f3a. Ng even m\u1ed9t s\u1ef1 t\u0103ng m\u1ed9t milimet such nh\u01b0 kh\u00f4ng \u0111\u00e1ng k\u1ec3 c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m \u0111\u00e1ng k\u1ec3 m\u1eadt \u0111\u1ed9 flux hi\u1ec7u d\u1ee5ng.<\/li>\n<li><strong>Kh\u1ed1i l\u01b0\u1ee3ng Nam ch\u00e2m (Magnet Volume):<\/strong> Nam ch\u00e2m l\u1edbn h\u01a1n cung c\u1ea5p nhi\u1ec1u \u201cnhi\u00ean li\u1ec7u\u201d cho tr\u01b0\u1eddng, nh\u01b0ng hi\u1ec7u su\u1ea5t s\u1ebd gi\u1ea3m n\u1ebfu h\u00ecnh h\u1ecdc kh\u00f4ng \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a.<\/li>\n<\/ul>\n<h3>Ch\u00ednh x\u00e1c trong s\u1ea3n xu\u1ea5t<\/h3>\n<p>Gi\u1ea3 thuy\u1ebft l\u00e0 kh\u00f4ng c\u00f3 g\u00ec n\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c th\u1ef1c thi. N\u1ebfu h\u01b0\u1edbng t\u1eeb h\u00f3a c\u1ee7a m\u1ed9t kh\u1ed1i \u0111\u01a1n v\u1ecb l\u1ec7ch v\u00e0i \u0111\u1ed9, s\u1ef1 nhi\u1ec5u t\u01b0\u01a1ng \u0111\u00f3ng g\u00f3p s\u1ebd th\u1ea5t b\u1ea1i, v\u00e0 \u0111\u1ed9 m\u1ea1nh tr\u01b0\u1eddng t\u1ed5ng c\u1ed9ng s\u1ebd gi\u1ea3m. Ch\u00fang ta d\u1ef1a v\u00e0o s\u1ef1 gh\u00e9p n\u1ed1i nghi\u00eam ng\u1eb7t <a href=\"https:\/\/nbaem.com\/vi\/quality-control\/\" target=\"_blank\" rel=\"noopener\">ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng<\/a> \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o tr\u1ee5c t\u1ef1 do c\u1ee7a t\u1eebng \u0111o\u1ea1n \u0111\u01b0\u1ee3c c\u0103n ch\u1ec9nh ho\u00e0n h\u1ea3o. L\u1eafp r\u00e1p \u0111\u1ed9 ch\u00ednh x\u00e1c cao l\u00e0 c\u00e1ch duy nh\u1ea5t \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o m\u1ea3ng ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang nh\u01b0 d\u1ef1 \u0111o\u00e1n trong m\u00f4 ph\u1ecfng.<\/p>\n<h2>\u1ee8ng d\u1ee5ng th\u1ef1c t\u1ebf v\u00e0 \u0111\u1ed9 m\u1ea1nh tr\u01b0\u1eddng \u0111\u1ea1t \u0111\u01b0\u1ee3c<\/h2>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-3609\" src=\"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/12\/Monopole_Halbach_Array_Magnets_Advantages_T6Pvifrz.webp\" alt=\"\" width=\"956\" height=\"307\" srcset=\"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/12\/Monopole_Halbach_Array_Magnets_Advantages_T6Pvifrz-18x6.webp 18w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/12\/Monopole_Halbach_Array_Magnets_Advantages_T6Pvifrz-200x64.webp 200w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/12\/Monopole_Halbach_Array_Magnets_Advantages_T6Pvifrz-300x96.webp 300w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/12\/Monopole_Halbach_Array_Magnets_Advantages_T6Pvifrz-400x128.webp 400w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/12\/Monopole_Halbach_Array_Magnets_Advantages_T6Pvifrz-600x193.webp 600w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/12\/Monopole_Halbach_Array_Magnets_Advantages_T6Pvifrz-768x247.webp 768w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/12\/Monopole_Halbach_Array_Magnets_Advantages_T6Pvifrz-800x257.webp 800w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/12\/Monopole_Halbach_Array_Magnets_Advantages_T6Pvifrz.webp 956w\" sizes=\"(max-width: 956px) 100vw, 956px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>T\u1ea1i NBAEM, ch\u00fang t\u00f4i thi\u1ebft k\u1ebf c\u00e1c t\u1ed5 h\u1ee3p Halbach chuy\u1ec3n \u0111\u1ed5i c\u00e1c nguy\u00ean l\u00fd t\u1eeb tr\u01b0\u1eddng t\u1eeb l\u00fd thuy\u1ebft th\u00e0nh hi\u1ec7u su\u1ea5t c\u00f4ng nghi\u1ec7p c\u00f3 th\u1ec3 \u0111o \u0111\u01b0\u1ee3c. B\u1eb1ng c\u00e1ch ki\u1ec3m so\u00e1t m\u1eadt \u0111\u1ed9 flux t\u1eeb th\u00f4ng qua \u0111\u1ecbnh h\u01b0\u1edbng ch\u00ednh x\u00e1c, ch\u00fang t\u00f4i \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 m\u1ea1nh tr\u01b0\u1eddng m\u00e0 c\u00e1c c\u1ea5u h\u00ecnh ti\u00eau chu\u1ea9n kh\u00f4ng th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u00e0 kh\u00f4ng l\u00e0m t\u0103ng \u0111\u00e1ng k\u1ec3 th\u1ec3 t\u00edch.<\/p>\n<h3>\u0110\u1ed9ng c\u01a1 \u0111i\u1ec7n v\u00e0 r\u00f4to<\/h3>\n<p>\u1ede c\u00e1c \u0111\u1ed9ng c\u01a1 BLDC hi\u1ec7u su\u1ea5t cao, <strong>m\u1ea3ng Halbach h\u00ecnh v\u00f2ng<\/strong> l\u00e0 chu\u1ea9n \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t. B\u1eb1ng c\u00e1ch t\u1eadp trung t\u1eeb tr\u01b0\u1eddng \u1edf \u0111\u01b0\u1eddng k\u00ednh trong (cho rotor), ch\u00fang t\u00f4i th\u01b0\u1eddng \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1eadt \u0111\u1ed9 flux khe h\u1edf gi\u1eefa <strong>1.2 T v\u00e0 1.8 T<\/strong>. S\u1ef1 t\u1eadp trung n\u00e0y cho ph\u00e9p cho m\u1ed9t <strong>15% gia t\u0103ng m\u1eadt \u0111\u1ed9 m\u00f4-men xo\u1eafn<\/strong> v\u00e0 c\u00f3 th\u1ec3 gi\u1ea3m tr\u1ecdng l\u01b0\u1ee3ng h\u1ec7 th\u1ed1ng t\u1ed5ng th\u1ec3 kho\u1ea3ng 20% v\u00ec kh\u00f4ng y\u00eau c\u1ea7u t\u1ea5m l\u01b0ng s\u1eaft n\u1eb7ng. Ch\u00fang t\u00f4i th\u01b0\u1eddng t\u00edch h\u1ee3p c\u00e1c m\u1ea3ng n\u00e0y v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c <a href=\"https:\/\/nbaem.com\/vi\/products\/lamination-core\/\" target=\"_blank\" rel=\"noopener\">l\u00f5i laminate<\/a> \u0111\u1ec3 gi\u1ea3m t\u1ed1i thi\u1ec3u t\u1ed5n th\u1ea5t d\u00f2ng xo\u00e1y v\u00e0 t\u1ed1i \u01b0u h\u00f3a \u0111\u1ea7u ra c\u1ee7a \u0111\u1ed9ng c\u01a1.<\/p>\n<h3>H\u00ecnh \u1ea3nh y t\u1ebf (MRI c\u1ea7m tay)<\/h3>\n<p>T\u00ednh ch\u1ea5t t\u1ef1 che ch\u1eafn c\u1ee7a \u1ed1ng Halbach l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00f4ng ngh\u1ec7 MRI c\u1ea7m tay. Ch\u00fang t\u00f4i thi\u1ebft k\u1ebf c\u00e1c m\u1ea3ng Halbach t\u1eeb gh\u00e9p \u0111,lip dipole t\u1ea1o ra tr\u01b0\u1eddng \u0111\u1ed3ng nh\u1ea5t cao dao \u0111\u1ed9ng t\u1eeb <strong>0.5 T \u0111\u1ebfn 1.5 T<\/strong>. Kh\u00f4ng gi\u1ed1ng nam ch\u00e2m si\u00eau d\u1eabn, c\u00e1c c\u1ee5m nam ch\u00e2m v\u0129nh vi\u1ec5n n\u00e0y kh\u00f4ng y\u00eau c\u1ea7u l\u00e0m l\u1ea1nh cryogenic, l\u00e0m cho ch\u00fang l\u00fd t\u01b0\u1edfng cho c\u00e1c thi\u1ebft b\u1ecb y t\u1ebf c\u1ee1 nh\u1ecf, t\u1ea1i ch\u1ed7.<\/p>\n<h3>Gia t\u1ed1c h\u1ea1t v\u00e0 ti\u00eau chu\u1ea9n ch\u00f9y beam<\/h3>\n<p>Quay tr\u1edf l\u1ea1i ngu\u1ed3n g\u1ed1c c\u1ee7a thi\u1ebft k\u1ebf, <strong>nam ch\u00e2m Halbach tr\u01b0\u1eddng m\u1ea1nh<\/strong> l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 h\u1ed9i t\u1ee5 ch\u00f9y h\u1ea1t. Trong c\u00e1c \u1ee9ng d\u1ee5ng n\u00e0y, t\u00ednh \u0111\u1ed3ng nh\u1ea5t c\u1ee7a tr\u01b0\u1eddng c\u0169ng quan tr\u1ecdng nh\u01b0 s\u1ee9c m\u1ea1nh th\u00f4 s\u01a1. Th\u00f4ng qua vi\u1ec7c s\u1eed d\u1ee5ng Neodymium N55 ch\u1ea5t l\u01b0\u1ee3ng cao ho\u1eb7c \u1ed5n \u0111\u1ecbnh nhi\u1ec7t <a href=\"https:\/\/nbaem.com\/vi\/what-is-high-performance-smco-magnets\/\" target=\"_blank\" rel=\"noopener\">nam ch\u00e2m SmCo hi\u1ec7u su\u1ea5t cao<\/a>, ch\u00fang ta c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c tr\u01b0\u1eddng m\u1ea1nh v\u01b0\u1ee3t qu\u00e1 <strong>1 T \u0111\u1ebfn 5 T<\/strong> trong c\u00e1c c\u1ea5u h\u00ecnh th\u00f4ng t\u1ee5 v\u00e0 undulator \u0111\u1eb7c bi\u1ec7t.<\/p>\n<h3>C\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng Typical theo \u1ee9ng d\u1ee5ng<\/h3>\n<ul>\n<li><strong>\u0110\u1ed9ng c\u01a1 \u0111i\u1ec7n:<\/strong> 1,2\u20131,8 T (Cao <strong>m\u00f4-men xo\u1eafn c\u1ee7a \u0111\u1ed9ng c\u01a1 m\u1ea3ng Halbach<\/strong>)<\/li>\n<li><strong>H\u1ec7 th\u1ed1ng t\u1eeb t\u00ednh t\u1eeb h\u00e0ng kh\u00f4ng:<\/strong> C\u00e1c l\u1ef1c t\u1eeb tr\u01b0\u1eddng n\u00e2ng \u0111\u1ee1 m\u1ea1nh v\u1edbi s\u1ef1 r\u00f2 r\u1ec9 g\u1ea7n nh\u01b0 b\u1eb1ng kh\u00f4ng \u1edf ph\u00eda h\u00e0nh kh\u00e1ch.<\/li>\n<li><strong>\u0110\u1ed9ng c\u01a1 Tr\u1ef1c ti\u1ebfp:<\/strong> 1.0\u20131.4 T utilizing linear Halbach arrays.<\/li>\n<li><strong>Thi\u1ebft b\u1ecb Khoa h\u1ecdc v\u00e0 C\u1ed1 \u0111\u1ecbnh:<\/strong> 1.0\u20135.0 T+ (Thi\u1ebft k\u1ebf t\u1ed1i \u01b0u h\u00f3a t\u00f9y ch\u1ec9nh).<\/li>\n<\/ul>\n<h2>\u01afu \u0111i\u1ec3m c\u1ee7a M\u1ea3ng Halbach cho C\u01b0\u1eddng \u0111\u1ed9 Tr\u01b0\u1eddng Cao<\/h2>\n<p>T\u1ea1i NBAEM, ch\u00fang t\u00f4i \u0111\u1ec1 xu\u1ea5t c\u1ea5u h\u00ecnh Halbach khi gi\u1ea3m tr\u1ecdng l\u01b0\u1ee3ng v\u00e0 t\u1ed1i \u0111a h\u00f3a tr\u01b0\u1eddng l\u00e0 c\u00e1c r\u00e0ng bu\u1ed9c d\u1ef1 \u00e1n then ch\u1ed1t. B\u1eb1ng c\u00e1ch \u0111i\u1ec1u ch\u1ec9nh h\u01b0\u1edbng t\u1eeb, c\u00e1c m\u1ea3ng n\u00e0y mang l\u1ea1i l\u1ee3i th\u1ebf k\u1ef9 thu\u1eadt ri\u00eang bi\u1ec7t so v\u1edbi nam ch\u00e2m v\u0129nh vi\u1ec5n ti\u00eau chu\u1ea9n.<\/p>\n<h3>Hi\u1ec7u qu\u1ea3 v\u1eadt li\u1ec7u v\u01b0\u1ee3t tr\u1ed9i<\/h3>\n<p>L\u1ee3i \u00edch ch\u00ednh c\u1ee7a m\u1ed9t <strong>tr\u01b0\u1eddng t\u1eeb Halbach<\/strong> l\u00e0 kh\u1ea3 n\u0103ng l\u00e0m \u0111\u01b0\u1ee3c nhi\u1ec1u h\u01a1n v\u1edbi \u00edt h\u01a1n. V\u00ec thi\u1ebft k\u1ebf t\u1eadp trung l\u1ef1c t\u1eeb l\u00ean m\u1eb7t ho\u1ea1t \u0111\u1ed9ng th\u00f4ng qua t\u01b0\u01a1ng t\u00e1c c\u1ed9ng h\u01b0\u1edfng, ch\u00fang ta c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ed9t m\u1ee9c cao h\u01a1n \u0111\u00e1ng k\u1ec3 <strong>h\u1ec7 Halbach flux<\/strong> m\u00e0 kh\u00f4ng l\u00e0m t\u0103ng th\u1ec3 t\u00edch v\u1eadt li\u1ec7u nam ch\u00e2m. Trong nhi\u1ec1u b\u1ed9 l\u1eafp r\u00e1p t\u00f9y ch\u1ec9nh c\u1ee7a ch\u00fang t\u00f4i, \u0111i\u1ec1u n\u00e0y cho ph\u00e9p gi\u1ea3m th\u1ec3 t\u00edch nam ch\u00e2m t\u1eeb <strong>20% xu\u1ed1ng 50%<\/strong> trong khi v\u1eabn \u0111\u1ea1t hi\u1ec7u su\u1ea5t c\u1ee7a m\u1ed9t nam ch\u00e2m l\u1edbn h\u01a1n v\u00e0 th\u00f4ng th\u01b0\u1eddng. Hi\u1ec7u qu\u1ea3 n\u00e0y tr\u1ef1c ti\u1ebfp chuy\u1ec3n \u0111\u1ed5i th\u00e0nh chi ph\u00ed v\u1eadt li\u1ec7u th\u1ea5p h\u01a1n v\u00e0 t\u1ed5ng th\u1ec3 l\u1eafp gh\u00e9p nh\u1eb9 h\u01a1n.<\/p>\n<h3>Kh\u1ea3 n\u0103ng t\u1ef1 che ch\u1eafn<\/h3>\n<p>A <strong>m\u1ea3ng Halbach t\u1ef1 che ch\u1eafn<\/strong> lo\u1ea1i b\u1ecf nhu c\u1ea7u cho c\u00e1c th\u00e0nh ph\u1ea7n che ch\u1eafn n\u1eb7ng. Trong m\u1ed9t <strong>so s\u00e1nh m\u1ea3ng Halbach v\u1edbi nam ch\u00e2m th\u00f4ng th\u01b0\u1eddng<\/strong> m\u1ed9t nam ch\u00e2m ti\u00eau chu\u1ea9n th\u01b0\u1eddng c\u1ea7n c\u00f3 b\u1ea3ng l\u01b0ng s\u1eaft n\u1eb7ng \u0111\u1ec3 \u0111i\u1ec1u h\u01b0\u1edbng flux v\u00e0 che ch\u1eafn ph\u00eda sau. C\u1ea5u h\u00ecnh Halbach t\u1ef1 nhi\u00ean h\u1ee7y b\u1ecf tr\u01b0\u1eddng t\u1eeb \u1edf ph\u00eda \u201cy\u00ean t\u0129nh\u201d, d\u1eabn \u0111\u1ebfn r\u00f2 r\u1ec9 g\u1ea7n b\u1eb1ng zero. \u0110i\u1ec1u n\u00e0y lo\u1ea1i b\u1ecf y\u00eau c\u1ea7u cho c\u00e1c l\u00f5i s\u1eaft ph\u00eda sau, l\u00e0m gi\u1ea3m \u0111\u00e1ng k\u1ec3 t\u1ed5ng tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a h\u1ec7 th\u1ed1ng\u2014m\u1ed9t y\u1ebfu t\u1ed1 s\u1ed1ng c\u00f2n cho rotor hi\u1ec7u su\u1ea5t cao v\u00e0 c\u00e1c thi\u1ebft b\u1ecb di \u0111\u1ed9ng.<\/p>\n<h3>T\u00edch h\u1ee3p nh\u1ecf g\u1ecdn v\u00e0 an to\u00e0n<\/h3>\n<p>S\u1ef1 ch\u1ee9a \u0111\u1ef1ng tr\u01b0\u1eddng t\u1eeb khi\u1ebfn c\u00e1c m\u1ea3ng n\u00e0y an to\u00e0n h\u01a1n khi t\u00edch h\u1ee3p v\u00e0o c\u00e1c h\u1ec7 th\u00f4ng ph\u1ee9c t\u1ea1p. V\u00ec tr\u01b0\u1eddng qu\u00e9t l\u1ec7ch r\u1ea5t nh\u1ecf \u1edf ph\u00eda kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng n\u00ean nguy c\u01a1 nhi\u1ec5u v\u1edbi c\u00e1c linh ki\u1ec7n \u0111i\u1ec7n t\u1eed nh\u1ea1y c\u1ea3m l\u00e2n c\u1eadn th\u1ea5p h\u01a1n.<\/p>\n<h2>Th\u00e1ch th\u1ee9c v\u00e0 h\u1ea1n ch\u1ebf \u0111\u1ea1t \u0111\u01b0\u1ee3c c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng cao<\/h2>\n<p>Trong khi <strong>tr\u01b0\u1eddng t\u1eeb Halbach<\/strong> t\u00edn hi\u1ec7u flux v\u01b0\u1ee3t tr\u1ed9i, \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 n\u00e0y \u0111\u00f2i h\u1ecfi c\u00e1c r\u00e0o c\u1ea3n k\u1ef9 thu\u1eadt \u0111\u00e1ng k\u1ec3. Hi\u1ec3u bi\u1ebft v\u1ec1 c\u00e1c gi\u1edbi h\u1ea1n n\u00e0y l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng \u0111\u1ec3 thi\u1ebft k\u1ebf c\u00e1c t\u1ed5 h\u1ee3p t\u1eeb an to\u00e0n v\u00e0 \u0111\u00e1ng tin c\u1eady.<\/p>\n<h3>Kh\u00f3 kh\u0103n l\u1eafp r\u00e1p v\u00e0 l\u1ef1c \u0111\u1ea9y ph\u1ea3n<\/h3>\n<p>Vi\u1ec7c ch\u1ebf t\u1ea1o m\u1ed9t h\u1ec7 th\u1ed1ng hi\u1ec7u su\u1ea5t cao <strong>m\u1ea3ng Halbach Neodymium<\/strong> l\u00e0 m\u1ed9t c\u00f4ng vi\u1ec7c \u0111\u00f2i h\u1ecfi th\u1ec3 ch\u1ea5t. B\u1edfi v\u00ec h\u01b0\u1edbng t\u1eeb h\u00f3a xoay 90\u00b0 gi\u1eefa c\u00e1c segment, c\u00e1c nam ch\u00e2m li\u1ec1n k\u1ec1 th\u01b0\u1eddng g\u00e2y ra l\u1ef1c \u0111\u1ea9y m\u1ea1nh l\u00ean nhau trong qu\u00e1 tr\u00ecnh l\u1eafp r\u00e1p.<\/p>\n<ul>\n<li><strong>R\u1ee7i ro An to\u00e0n:<\/strong> N\u1ebfu kh\u00f4ng c\u00f3 c\u00e1c khu\u00f4n l\u1eafp r\u00e1p chuy\u00ean d\u1ee5ng, c\u00e1c l\u1ef1c n\u00e0y c\u00f3 th\u1ec3 l\u00e0m nam ch\u00e2m b\u1eadt v\u00e0o nhau m\u1ed9t c\u00e1ch d\u1eef d\u1eb1n, d\u1eabn \u0111\u1ebfn s\u1ee9t m\u1ebb ho\u1eb7c v\u1ee1.<\/li>\n<li><strong>\u0110\u1ed9 to\u00e0n v\u1eb9n c\u1ea5u tr\u00fac:<\/strong> M\u1ea3ng ph\u1ea3i b\u1ecb h\u1ea1n ch\u1ebf m\u1ed9t c\u00e1ch c\u01a1 h\u1ecdc (th\u01b0\u1eddng b\u1eb1ng v\u1ecf ngo\u00e0i kh\u00f4ng t\u1eeb ho\u1eb7c keo) \u0111\u1ec3 ng\u0103n c\u00e1c nam ch\u00e2m b\u1ecb v\u0103ng ra kh\u1ecfi nhau d\u01b0\u1edbi l\u1ef1c c\u0103ng n\u1ed9i t\u1ea1i c\u1ee7a ch\u00fang.<\/li>\n<\/ul>\n<h3>S\u1ea3n xu\u1ea5t ch\u00ednh x\u00e1c v\u00e0 chi ph\u00ed<\/h3>\n<p>\u0110\u1ec3 t\u1ed1i \u0111a h\u00f3a <strong>h\u1ec7 Halbach flux<\/strong>, g\u00f3c t\u1eeb h\u00f3a c\u1ee7a t\u1eebng \u0111o\u1ea1n ph\u1ea3i ch\u00ednh x\u00e1c. Quay m\u1ed9t g\u00f3c 90\u00b0 ho\u00e0n h\u1ea3o l\u00e0 l\u00fd thuy\u1ebft; trong th\u1ef1c t\u1ebf, c\u00e1c sai l\u1ec7ch nh\u1ecf trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m hi\u1ec7u \u1ee9ng giao thoa t\u0103ng c\u01b0\u1eddng.<\/p>\n<ul>\n<li><strong>Dung sai:<\/strong> C\u00e1c m\u1ea3ng hi\u1ec7u su\u1ea5t cao \u0111\u00f2i h\u1ecfi sai s\u1ed1 h\u00ecnh h\u1ecdc ch\u1eb7t ch\u1ebd. Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng ngh\u1ec7 ti\u00ean ti\u1ebfn <a href=\"https:\/\/nbaem.com\/vi\/magnet-machining\/\" target=\"_blank\" rel=\"noopener\">kh\u1ea3 n\u0103ng gia c\u00f4ng nam ch\u00e2m<\/a> \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o m\u1ecdi ph\u00e2n \u0111o\u1ea1n v\u1eeba kh\u00edt ho\u00e0n h\u1ea3o, t\u1ed1i thi\u1ec3u h\u00f3a kho\u1ea3ng tr\u1ed1ng kh\u00f4ng kh\u00ed v\u1ed1n s\u1ebd l\u00e0m y\u1ebfu tr\u01b0\u1eddng.<\/li>\n<li><strong>C\u00e1c y\u1ebfu t\u1ed1 chi ph\u00ed:<\/strong> Nhu c\u1ea7u jigs magnet h\u00f3a t\u00f9y ch\u1ec9nh v\u00e0 gia c\u00f4ng ch\u00ednh x\u00e1c khi\u1ebfn c\u00e1c m\u1ea3ng n\u00e0y c\u00f3 gi\u00e1 s\u1ea3n xu\u1ea5t \u0111\u1eaft h\u01a1n so v\u1edbi nam ch\u00e2m dipole ti\u00eau chu\u1ea9n.<\/li>\n<\/ul>\n<h3>Nh\u1ea1y c\u1ea3m v\u1edbi nhi\u1ec7t \u0111\u1ed9<\/h3>\n<p>\"Vi\u1ec7c l\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u quy\u1ebft \u0111\u1ecbnh gi\u1edbi h\u1ea1n v\u1eadn h\u00e0nh c\u1ee7a m\u1ea3ng.\"<\/p>\n<ul>\n<li><strong>Neodymium (NdFeB):<\/strong> Cung c\u1ea5p m\u1ee9c \u0111\u1ed9 cao nh\u1ea5t <strong>\u0111\u1ed9 m\u1ea1nh tr\u01b0\u1eddng<\/strong> (\u0111\u1ebfn) 80\u00b0C cho c\u00e1c lo\u1ea1i th\u00f4ng th\u01b0\u1eddng.<\/li>\n<li><strong>Samarium Cobalt (SmCo):<\/strong> Thi\u1ebft y\u1ebfu cho c\u00e1c \u1ee9ng d\u1ee5ng \u1edf nhi\u1ec7t \u0111\u1ed9 cao. Trong khi SmCo cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng t\u1eeb t\u1eeb nam ch\u00e2m h\u01a1i th\u1ea5p h\u01a1n neodymium m\u1ea1nh nh\u1ea5t, n\u00f3 v\u1eabn duy tr\u00ec s\u1ef1 \u1ed5n \u0111\u1ecbnh cho \u0111\u1ebfn <strong>300\u00b0C\u2013350\u00b0C<\/strong>, ng\u0103n ch\u1eb7n s\u1ef1 m\u1ea5t t\u1eeb t\u00ednh kh\u00f4ng th\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c \u1edf nh\u1eefng m\u00f4i tr\u01b0\u1eddng n\u00f3ng nh\u01b0 rotor \u00f4 t\u00f4.<\/li>\n<\/ul>\n<h2>Nh\u01b0 th\u1ebf n\u00e0o NBAEM cung c\u1ea5p c\u00e1c m\u1ea3ng Halbach t\u00f9y ch\u1ec9nh v\u1edbi c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng t\u1ed1i \u01b0u<\/h2>\n<p>T\u1ea1i NBAEM, ch\u00fang t\u00f4i chuy\u00ean v\u1ec1 k\u1ef9 thu\u1eadt <strong>thi\u1ebft k\u1ebf Halbach t\u1ed1i \u01b0u<\/strong> nh\u1eb1m t\u1ed1i \u01b0u m\u1eadt \u0111\u1ed9 t\u1eeb th\u00f4ng cho c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p tr\u1ecdng y\u1ebfu. Ch\u00fang t\u00f4i kh\u00f4ng ch\u1ec9 cung c\u1ea5p nam ch\u00e2m; ch\u00fang t\u00f4i ch\u1ebf t\u1ea1o c\u00e1c l\u1eafp gh\u00e9p ho\u00e0n ch\u1ec9nh \u0111\u01b0\u1ee3c t\u00f9y bi\u1ebfn \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ee5c ti\u00eau c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng c\u1ee5 th\u1ec3, \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n ho\u1ea1t \u0111\u1ed9ng \u1edf hi\u1ec7u qu\u1ea3 t\u1ed1i \u0111a.<\/p>\n<h3>Kh\u1ea3 n\u0103ng s\u1ea3n xu\u1ea5t c\u1ee7a ch\u00fang t\u00f4i<\/h3>\n<p>Ch\u00fang t\u00f4i t\u1eadn d\u1ee5ng c\u00f4ng ngh\u1ec7 sintering v\u00e0 magnetization ti\u00ean ti\u1ebfn \u0111\u1ec3 s\u1ea3n xu\u1ea5t c\u00e1c l\u1eafp gh\u00e9p c\u00f3 tr\u01b0\u1eddng t\u1eeb. N\u0103ng l\u1ef1c c\u1ee7a ch\u00fang t\u00f4i bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>V\u1eadt li\u1ec7u cao c\u1ea5p:<\/strong> Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng c\u00e1c c\u1ea5p Neodymium \u0111\u01b0\u1ee3c sintered l\u00ean \u0111\u1ebfn <strong>N55<\/strong>\u00a0(BHmax 55 MGOe) cho s\u1ee9c m\u1ea1nh \u1edf nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng cao nh\u1ea5t c\u00f3 th\u1ec3. \u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u \u1ed5n \u0111\u1ecbnh trong m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 cao, ch\u00fang t\u00f4i t\u00edch h\u1ee3p <a href=\"https:\/\/nbaem.com\/pt_pt\/what-is-high-performance-smco-magnets\/\">nam ch\u00e2m SmCo hi\u1ec7u su\u1ea5t cao<\/a> \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ea7u ra tr\u01b0\u1eddng th\u1ed1ng nh\u1ea5t l\u00ean t\u1edbi 350\u00b0C.<\/li>\n<li><strong>\u0110\u1ecba h\u00ecnh Geometries ph\u1ee9c t\u1ea1p:<\/strong> C\u01a1 s\u1edf c\u1ee7a ch\u00fang t\u00f4i x\u1eed l\u00fd \u0111\u1ecbnh h\u01b0\u1edbng t\u1eeb t\u00ednh ch\u00ednh x\u00e1c \u1edf 90\u00b0 cho c\u00e1c m\u1ea3ng tuy\u1ebfn t\u00ednh, r\u00f4to tr\u00f2n (OD\/ID), v\u00e0 c\u00e1c c\u1ea5u h\u00ecnh 3D t\u00f9y ch\u1ec9nh.<\/li>\n<li><strong>H\u1ed7 tr\u1ee3 K\u1ef9 thu\u1eadt:<\/strong> Ch\u00fang t\u00f4i cung c\u1ea5p m\u00f4 h\u00ecnh ph\u00e2n t\u00edch ph\u1ea7n t\u1eed h\u1eefu h\u1ea1n (FEA) to\u00e0n di\u1ec7n <strong>FEA modeling<\/strong> v\u00e0 ki\u1ec3m tra nguy\u00ean m\u1eabu \u0111\u1ec3 x\u00e1c th\u1ef1c <strong>C\u1ea3m bi\u1ebfn t\u1eeb Halbach<\/strong> ph\u00e2n ph\u1ed1i tr\u01b0\u1edbc s\u1ea3n xu\u1ea5t quy m\u00f4 l\u1edbn.<\/li>\n<\/ul>\n<h3>L\u1ee3i \u00edch cho D\u1ef1 \u00e1n c\u1ee7a B\u1ea1n<\/h3>\n<p>K\u00fd k\u1ebft h\u1ee3p t\u00e1c v\u1edbi NBAEM cho ph\u00e9p b\u1ea1n chuy\u1ec3n t\u1eeb c\u00e1c thi\u1ebft k\u1ebf l\u00fd thuy\u1ebft sang ph\u1ea7n c\u1ee9ng th\u1ef1c t\u1ebf, hi\u1ec7u su\u1ea5t cao.<\/p>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: left;\">\u0110\u1eb7c \u0111i\u1ec3m<\/th>\n<th style=\"text-align: left;\">L\u1ee3i \u00edch Tr\u1ef1c ti\u1ebfp<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: left;\"><strong>Ph\u00e1t tri\u1ec3n Tr\u01b0\u1eddng v\u00f9ng t\u1eeb<\/strong><\/td>\n<td style=\"text-align: left;\">\u0110\u1ea1t \u0111\u01b0\u1ee3c <strong>1,4x \u0111\u1ebfn 2,0x<\/strong> tr\u01b0\u1eddng m\u1ea1nh h\u01a1n tr\u00ean m\u1eb7t ho\u1ea1t \u0111\u1ed9ng so v\u1edbi m\u1ea3ng ti\u00eau chu\u1ea9n.<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Gi\u1ea3m Tr\u1ecdng l\u01b0\u1ee3ng<\/strong><\/td>\n<td style=\"text-align: left;\">Gi\u1ea3m tr\u1ecdng l\u01b0\u1ee3ng h\u1ec7 th\u1ed1ng b\u1eb1ng <strong>~20%<\/strong> b\u1eb1ng c\u00e1ch lo\u1ea1i b\u1ecf nhu c\u1ea7u s\u1eed d\u1ee5ng l\u01b0ng b\u1ea3n s\u1eaft n\u1eb7ng.<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Hi\u1ec7u qu\u1ea3 v\u1eadt li\u1ec7u<\/strong><\/td>\n<td style=\"text-align: left;\">Gi\u1ea3m chi ph\u00ed d\u00e0i h\u1ea1n b\u1eb1ng c\u00e1ch \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u00f4-men xo\u1eafn ho\u1eb7c l\u1ef1c gi\u1eef cao h\u01a1n v\u1edbi th\u1ec3 t\u00edch t\u1eeb nh\u1ecf h\u01a1n.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e2u h\u1ecfi Th\u01b0\u1eddng g\u1eb7p v\u1ec1 C\u01b0\u1eddng \u0111\u1ed9 Tr\u01b0\u1eddng Halbach<\/h2>\n<p>L\u00e0 m\u1ed9t nh\u00e0 s\u1ea3n xu\u1ea5t h\u00e0ng \u0111\u1ea7u v\u1ec1 t\u1ed5 h\u1ee3p from t\u1eeb t\u00ednh ti\u00ean ti\u1ebfn, ch\u00fang t\u00f4i g\u1eb7p nhi\u1ec1u th\u1eafc m\u1eafc k\u1ef9 thu\u1eadt li\u00ean quan \u0111\u1ebfn gi\u1edbi h\u1ea1n hi\u1ec7u su\u1ea5t v\u00e0 v\u1eadt l\u00fd c\u1ee7a c\u00e1c c\u1ea5u h\u00ecnh \u0111\u1ed9c \u0111\u00e1o n\u00e0y. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e2u tr\u1ea3 l\u1eddi cho nh\u1eefng c\u00e2u h\u1ecfi ph\u1ed5 bi\u1ebfn nh\u1ea5t v\u1ec1 <strong>tr\u01b0\u1eddng t\u1eeb Halbach<\/strong> \u0111\u1eb7c \u0111i\u1ec3m.<\/p>\n<h3>\u0110i\u1ec3m t\u1eeb tr\u01b0\u1eddng t\u1ed1i \u0111a c\u1ee7a m\u1ed9t m\u1ea3ng Halbach l\u00e0 g\u00ec?<\/h3>\n<p>Gi\u1edbi h\u1ea1n l\u00fd thuy\u1ebft ph\u1ee5 thu\u1ed9c nhi\u1ec1u v\u00e0o h\u00ecnh h\u1ecdc v\u00e0 lo\u1ea1i v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. Trong khi m\u1ed9t <strong>m\u1ea3ng Halbach Neodymium<\/strong> kh\u1ed1i duy nh\u1ea5t b\u1ecb gi\u1edbi h\u1ea1n b\u1edfi d\u01b0 (Br) c\u1ee7a v\u1eadt li\u1ec7u (th\u00f4ng th\u01b0\u1eddng t\u1eeb 1.4\u20131.5 Tesla cho c\u1ea5p \u0111\u1ed9 N54), c\u00e1ch s\u1eafp x\u1ebfp h\u00ecnh h\u1ecdc cho ph\u00e9p t\u1eadp trung flux v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n n\u00e0y.<\/p>\n<ul>\n<li><strong>M\u1ea3ng ph\u1eb3ng (Planar Arrays):<\/strong> Th\u00f4ng th\u01b0\u1eddng \u0111\u1ea1t t\u1eeb 1.0 T \u0111\u1ebfn 1.4 T tr\u00ean b\u1ec1 m\u1eb7t.<\/li>\n<li><strong>M\u1ea3ng h\u00ecnh tr\u1ee5 (Halbach Cylinders):<\/strong> C\u00f3 th\u1ec3 t\u1eadp trung flux \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c <strong>1.5 T \u0111\u1ebfn 2.0 T<\/strong> t\u1ea1i l\u1ed7 r\u1ed7ng.<\/li>\n<li><strong>Thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t:<\/strong> Trong c\u00e1c thi\u1ebft l\u1eadp ph\u00f2ng th\u00ed nghi\u1ec7m ho\u1eb7c c\u00e1c thi\u1ebft k\u1ebf h\u00ecnh c\u1ea7u \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a cao, c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng c\u00f3 th\u1ec3 \u0111\u1ea1t t\u1edbi <strong>4 T \u0111\u1ebfn 5 T<\/strong>, m\u1eb7c d\u00f9 ch\u00fang ph\u1ee9c t\u1ea1p v\u00e0 \u0111\u1eaft \u0111\u1ec3 ch\u1ebf t\u1ea1o.<\/li>\n<\/ul>\n<h3>Halbach array m\u1ea1nh h\u01a1n bao nhi\u00eau so v\u1edbi nam ch\u00e2m ti\u00eau chu\u1ea9n?<\/h3>\n<p>M\u1ed9t b\u1ed9 Halbach \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u00fang c\u00e1ch \u0111i\u1ec3n h\u00ecnh t\u1ea1o ra m\u1ed9t tr\u01b0\u1eddng t\u1eeb <strong>t\u1eeb 1,4 \u0111\u1ebfn 2,0 l\u1ea7n m\u1ea1nh h\u01a1n<\/strong> \u1edf ph\u00eda ho\u1ea1t \u0111\u1ed9ng so v\u1edbi m\u1ed9t m\u1ea3ng nam ch\u00e2m th\u00f4ng th\u01b0\u1eddng c\u00f3 c\u00f9ng th\u1ec3 t\u00edch. S\u1ef1 t\u0103ng c\u01b0\u1eddng n\u00e0y x\u1ea5p x\u1ec9 b\u1eb1ng c\u0103n b\u1eadc hai c\u1ee7a 2 (\u22481,41) cho c\u00e1c thi\u1ebft k\u1ebf c\u01a1 b\u1ea3n. Hi\u1ec7u qu\u1ea3 n\u00e0y cho ph\u00e9p c\u00e1c k\u1ef9 s\u01b0 \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u1eeb tr\u01b0\u1eddng cao <strong>h\u1ec7 Halbach flux<\/strong> m\u00e0 kh\u00f4ng t\u0103ng t\u1ed5ng kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<h3>S\u1ed1 l\u01b0\u1ee3ng ph\u00e2n \u0111o\u1ea1n c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng t\u1eeb kh\u00f4ng?<\/h3>\n<p>C\u00f3, s\u1ed1 l\u01b0\u1ee3ng ph\u00e2n \u0111o\u1ea1n l\u00e0 r\u1ea5t then ch\u1ed1t. M\u1ed9t m\u1ea3ng Halbach l\u00fd t\u01b0\u1edfng v\u1ec1 m\u1eb7t l\u00fd thuy\u1ebft c\u00f3 vect\u01a1 t\u1eeb h\u00f3a li\u00ean t\u1ee5c quay. Trong th\u1ef1c t\u1ebf, ch\u00fang ta \u01b0\u1edbc l\u01b0\u1ee3ng \u0111i\u1ec1u n\u00e0y b\u1eb1ng c\u00e1c ph\u00e2n \u0111o\u1ea1n nam ch\u00e2m r\u1eddi r\u1ea1c (n\u00eam ho\u1eb7c kh\u1ed1i).<\/p>\n<ul>\n<li><strong>Nhi\u1ec1u Ph\u00e2n \u0111o\u1ea1n:<\/strong> T\u0103ng s\u1ed1 l\u01b0\u1ee3ng nam ch\u00e2m r\u1eddi r\u1ea1c tr\u00ean m\u1ed7i c\u1ef1c (v\u00ed d\u1ee5 8 ph\u00e2n \u0111o\u1ea1n so v\u1edbi 4 ph\u00e2n \u0111o\u1ea1n) t\u1ea1o ra m\u1ed9t tr\u01b0\u1eddng t\u1eeb m\u1ecbn h\u01a1n, b\u1eaft ch\u01b0\u1edbc g\u1ea7n \u0111\u00fang m\u1ed9t s\u00f3ng sin l\u00fd t\u01b0\u1edfng, d\u1eabn \u0111\u1ebfn c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng \u0111\u1ec9nh cao h\u01a1n m\u1ed9t ch\u00fat v\u00e0 gi\u1ea3m m\u00e9o h\u00e0i h\u00f2a.<\/li>\n<li><strong>Trade-off:<\/strong> M\u1eb7c d\u00f9 nhi\u1ec1u ph\u00e2n \u0111o\u1ea1n c\u1ea3i thi\u1ec7n <strong>c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng Halbach<\/strong>, ch\u00fang c\u0169ng l\u00e0m t\u0103ng ph\u1ee9c t\u1ea1p s\u1ea3n xu\u1ea5t v\u00e0 chi ph\u00ed l\u1eafp r\u00e1p.<\/li>\n<\/ul>\n<div id=\"references\" class=\"min-w-0 scroll-mt-8 overflow-hidden\">\n<div class=\"flex flex-col gap-2 text-sm leading-relaxed\">\n<div class=\"break-words text-[1em] leading-7\"><\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Kh\u00e1m ph\u00e1 c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng c\u1ee7a nam ch\u00e2m Halbach cho ph\u00e9p t\u1eeb th\u00f4ng m\u1ea1nh h\u01a1n 1,4 \u0111\u1ebfn 2 l\u1ea7n so v\u1edbi nam ch\u00e2m th\u00f4ng th\u01b0\u1eddng v\u1edbi thi\u1ebft k\u1ebf t\u1ed1i \u01b0u.<\/p>","protected":false},"author":1,"featured_media":3038,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3640","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/09\/Halbach_Array_Magnetic_Field_Enhancement_7lW9mSLV7.webp","_links":{"self":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/3640","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=3640"}],"version-history":[{"count":1,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/3640\/revisions"}],"predecessor-version":[{"id":3650,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/3640\/revisions\/3650"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media\/3038"}],"wp:attachment":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media?parent=3640"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/categories?post=3640"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/tags?post=3640"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}