{"id":3637,"date":"2026-01-12T07:44:07","date_gmt":"2026-01-12T07:44:07","guid":{"rendered":"https:\/\/nbaem.com\/?p=3637"},"modified":"2026-06-27T12:22:43","modified_gmt":"2026-06-27T12:22:43","slug":"what-magnet-materials-are-best-for-halbach-arrays","status":"publish","type":"post","link":"https:\/\/nbaem.com\/vi\/what-magnet-materials-are-best-for-halbach-arrays\/","title":{"rendered":"V\u1eadt li\u1ec7u nam ch\u00e2m t\u1ed1t nh\u1ea5t cho C\u00e1c M\u1ea3ng Halbach NdFeB vs SmCo H\u01b0\u1edbng d\u1eabn"},"content":{"rendered":"<p>B\u1ea1n \u0111ang v\u1eadt l\u1ed9n \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c <strong>lo\u1ea1i v\u1eadt li\u1ec7u nam ch\u00e2m n\u00e0o l\u00e0 t\u1ed1t nh\u1ea5t cho <a href=\"https:\/\/en.wikipedia.org\/wiki\/Halbach_array\" target=\"_blank\" rel=\"noopener\">c\u00e1c m\u1ea3ng Halbach<\/a><\/strong>?<\/p>\n<p>N\u1ebfu l\u00e0m sai \u0111i\u1ec1u n\u00e0y, l\u1eafp r\u00e1p c\u00f4ng ngh\u1ec7 cao c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 ph\u1ea3i ch\u1ecbu <strong>s\u1ef1 m\u1ea5t t\u1eeb t\u00ednh<\/strong>, b\u1ea5t \u1ed5n nhi\u1ec7t, ho\u1eb7c hi\u1ec7u qu\u1ea3 k\u00e9m.<\/p>\n<p>L\u00e0 m\u1ed9t chuy\u00ean gia nam ch\u00e2m t\u00f9y bi\u1ebfn, t\u00f4i bi\u1ebft r\u1eb1ng <strong>c\u1ea5u h\u00ecnh Halbach<\/strong> y\u00eau c\u1ea7u nhi\u1ec1u h\u01a1n vi\u1ec7c s\u1eed d\u1ee5ng nam ch\u00e2m ti\u00eau chu\u1ea9n\u2014ch\u00fang \u0111\u00f2i h\u1ecfi v\u1eadt li\u1ec7u c\u00f3 <strong>tr\u00ec ho\u00e3n t\u1eeb t\u00ednh tuy\u1ec7t \u0111\u1ed1i<\/strong> v\u00e0 <strong>t\u1eeb t\u00ednh c\u00f2n l\u1ea1i<\/strong> \u0111\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c c\u00e1c tr\u01b0\u1eddng \u0111\u1ed1i \u0111\u1ecbch m\u1ea1nh m\u1ebd.<\/p>\n<p>Trong h\u01b0\u1edbng d\u1eabn n\u00e0y, b\u1ea1n s\u1ebd kh\u00e1m ph\u00e1 l\u00fd do t\u1ea1i sao <a href=\"https:\/\/nbaem.com\/vi\/products\/neodymium-magnet\/\" target=\"_blank\" rel=\"noopener\"><strong>Neodymium Sintered (NdFeB)<\/strong> <\/a>v\u00e0<a href=\"https:\/\/nbaem.com\/vi\/products\/samarium-cobalt-magnets\/\" target=\"_blank\" rel=\"noopener\"> <strong>Cobalt Samari (SmCo)<\/strong><\/a> l\u00e0 ti\u00eau chu\u1ea9n ng\u00e0nh, v\u00e0 c\u00e1ch ch\u1ecdn c\u1ea5p \u0111\u1ed9 ho\u00e0n h\u1ea3o cho t\u1eebng tr\u01b0\u1eddng h\u1ee3p c\u1ee5 th\u1ec3 <strong>nhi\u1ec7t \u0111\u1ed9<\/strong> v\u00e0 <strong>hi\u1ec7u su\u1ea5t<\/strong> nhu c\u1ea7u.<\/p>\n<p>H\u00e3y \u0111i v\u00e0o l\u00f5i c\u1ee7a v\u1ea5n \u0111\u1ec1.<\/p>\n<h2>T\u1ea1i sao M\u1ea3ng Halbach \u0111\u00f2i h\u1ecfi v\u1eadt li\u1ec7u nam ch\u00e2m \u0111\u1eb7c bi\u1ec7t<\/h2>\n<p>Khi ch\u00fang ta thi\u1ebft k\u1ebf m\u1ed9t m\u1ea3ng Halbach, ch\u00fang ta kh\u00f4ng ch\u1ec9 gh\u00e9p ch\u1ed3ng c\u00e1c nam ch\u00e2m; ch\u00fang ta \u00e9p c\u00e1c tr\u01b0\u1eddng t\u1eeb tr\u1edf th\u00e0nh m\u1ed9t xung \u0111\u1ed9t m\u00e0 v\u1eadt l\u00fd t\u1ef1 nhi\u00ean ng\u0103n c\u1ea3n. C\u1ea5u tr\u00fac \u0111\u1eb7c bi\u1ec7t c\u1ee7a m\u1ed9t <strong>v\u00f2ng \u1ed1ng Halbach<\/strong> or <strong>m\u1ea3ng Halbach tuy\u1ebfn t\u00ednh<\/strong> d\u1ef1a v\u00e0o vi\u1ec7c quay h\u01b0\u1edbng ph\u00e2n c\u1ef1c 90\u00b0 gi\u1eefa c\u00e1c \u0111o\u1ea1n. Trong khi \u0111i\u1ec1u n\u00e0y th\u00e0nh c\u00f4ng \u0111\u1ec3 v\u00f4 hi\u1ec7u h\u00f3a tr\u01b0\u1eddng \u1edf m\u1ed9t ph\u00eda v\u00e0 khu\u1ebfch \u0111\u1ea1i n\u00f3 \u1edf ph\u00eda c\u00f2n l\u1ea1i, n\u00f3 t\u1ea1o ra m\u1ed9t m\u00f4i tr\u01b0\u1eddng th\u00f9 \u0111\u1ecbch cho v\u1eadt li\u1ec7u.<\/p>\n<h3>Hi\u1ec3u c\u00e1c tr\u01b0\u1eddng l\u00e0m m\u1ea5t t\u1eeb b\u00ean trong<\/h3>\n<p>Trong c\u00e1c l\u1eafp gh\u00e9p t\u1eeb th\u00f4ng ti\u00eau chu\u1ea9n, c\u00e1c c\u1ef1c th\u01b0\u1eddng c\u0103n ch\u1ec9nh \u0111\u1ec3 gi\u1ea3m thi\u1ec3u tr\u1edf l\u1ef1c. Trong c\u1ea5u h\u00ecnh Halbach, ch\u00fang ta \u00e9p nam ch\u00e2m ng\u1ed3i \u1edf \u0111\u1ed1i l\u1eadp tr\u1ef1c ti\u1ebfp v\u1edbi tr\u01b0\u1eddng c\u1ee7a c\u00e1c nam ch\u00e2m l\u00e2n c\u1eadn. \u0110i\u1ec1u n\u00e0y sinh ra nh\u1eefng <strong>\u00e1p l\u1ef1c l\u00e0m m\u1ea5t t\u1eeb c\u1ee7a m\u1ea3ng Halbach<\/strong> m\u1ea1nh. N\u1ebfu v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c ch\u1ecdn kh\u00f4ng ch\u1ecbu \u0111\u01b0\u1ee3c \u00e1p l\u1ef1c n\u1ed9i t\u1ea1i n\u00e0y, nam ch\u00e2m s\u1ebd th\u1ef1c s\u1ef1 \u201ct\u1ea5n c\u00f4ng\u201d l\u1eabn nhau, d\u1eabn \u0111\u1ebfn m\u1ea5t t\u1eeb t\u00ednh v\u0129nh vi\u1ec5n.<\/p>\n<h3>Vai tr\u00f2 c\u1ee7a t\u1eeb d\u01b0 (Br) v\u00e0 \u0111\u1ed9 t\u1eeb c\u01b0\u1ee1ng intrinsic (Hci)<\/h3>\n<p>\u0110\u1ec3 t\u1ed3n t\u1ea1i tr\u01b0\u1edbc cu\u1ed9c xung \u0111\u1ed9t t\u1eeb t\u00ednh n\u00e0y v\u00e0 \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ee9c t\u0103ng hi\u1ec7u su\u1ea5t t\u1eeb 1,4x \u0111\u1ebfn 2x nh\u01b0 ch\u00fang ta mong \u0111\u1ee3i t\u1eeb c\u00e1c t\u1ed5 h\u1ee3p NBAEM, ch\u00fang ta t\u1eadp trung v\u00e0o hai ch\u1ec9 s\u1ed1 then ch\u1ed1t:<\/p>\n<ul>\n<li><strong>S\u1ef1 t\u1eeb h\u00f3a t\u1eeb tr\u01b0\u1eddng (Br)<\/strong> \u0110i\u1ec1u n\u00e0y \u0111o s\u1ee9c m\u1ea1nh th\u00f4 c\u1ee7a tr\u01b0\u1eddng t\u1eeb xuy\u00ean. Br cao r\u1ea5t c\u1ea7n thi\u1ebft \u0111\u1ec3 t\u1ed1i \u0111a h\u00f3a m\u1ee9c \u0111\u1ed9. <strong>on-one-sided flux concentration<\/strong> hi\u1ec7u \u1ee9ng.<\/li>\n<li><strong>Ch\u1ecbu t\u1eeb n\u1ed9i t\u1ea1i (Hci):<\/strong> \u0110\u00e2y l\u00e0 kh\u1ea3 n\u0103ng c\u1ee7a nam ch\u00e2m ch\u1ed1ng b\u1ecb m\u1ea5t t\u1eeb. Trong c\u00e1c m\u1ea3ng Halbach, <strong>Tr\u1ecdng l\u1ef1c c\u1ee9ng n\u1ed9i t\u1ea1i Hci<\/strong> th\u01b0\u1eddng quan tr\u1ecdng h\u01a1n s\u1ee9c m\u1ea1nh th\u00f4. N\u1ebfu kh\u00f4ng c\u00f3 Hci cao, c\u00e1c tr\u01b0\u1eddng \u0111\u1ed1i \u0111\u1ecbch trong m\u1ea3ng s\u1ebd l\u00e0m c\u1ea1n ki\u1ec7t n\u0103ng l\u01b0\u1ee3ng c\u1ee7a nam ch\u00e2m v\u0129nh vi\u1ec5n.<\/li>\n<\/ul>\n<h3>T\u1ea1i sao Nam ch\u00e2m ti\u00eau chu\u1ea9n th\u1ea5t b\u1ea1i \u1edf h\u00ecnh h\u1ecdc n\u00e0y<\/h3>\n<p>Nam ch\u00e2m ti\u00eau chu\u1ea9n c\u1ea5p ti\u00eau d\u00f9ng th\u01b0\u1eddng thi\u1ebfu \u0111\u1eb7c t\u00ednh c\u1ee5 th\u1ec3 <strong>\u0111\u1ed9 c\u1ea3n t\u1eeb cao<\/strong> c\u1ea7n cho c\u00e1c t\u1ed5 h\u1ee3p ph\u1ee9c t\u1ea1p n\u00e0y. Khi \u0111\u01b0\u1ee3c \u0111\u1eb7t v\u00e0o m\u1ed9t m\u00f4 h\u00ecnh Halbach, v\u1eadt li\u1ec7u k\u00e9m ch\u1ea5t l\u01b0\u1ee3ng ch\u1ecbu s\u1ef1 m\u1ea5t t\u1eeb t\u00ednh kh\u00f4ng th\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c g\u1ea7n nh\u01b0 ngay l\u1eadp t\u1ee9c. \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o s\u1ef1 \u1ed5n \u0111\u1ecbnh v\u00e0 tu\u1ed5i th\u1ecd, ch\u00fang t\u00f4i ch\u1ec9 s\u1eed d\u1ee5ng t\u1eeb t\u00ednh ch\u1ea5t l\u01b0\u1ee3ng cao <strong>Nam ch\u00e2m v\u0129nh vi\u1ec5n \u0111\u1ea5t hi\u1ebfm<\/strong>\u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 duy tr\u00ec h\u01b0\u1edbng t\u1eeb c\u1ee7a ch\u00fang b\u1ea5t ch\u1ea5p c\u00e1c l\u1ef1c \u0111\u1ed1i kh\u00e1ng m\u00e3nh li\u1ec7t v\u1ed1n c\u00f3 trong thi\u1ebft k\u1ebf.<\/p>\n<h2>NdFeB C\u1ee9ng Sintered: L\u1ef1a ch\u1ecdn N\u0103ng l\u1ef1c h\u00e0ng \u0111\u1ea7u<\/h2>\n<p><img decoding=\"async\" class=\"alignnone  wp-image-1005\" src=\"https:\/\/nbaem.com\/wp-content\/uploads\/2022\/07\/Halbach-Array-Magnets-e1724637540523.png\" alt=\"Nam ch\u00e2m M\u1ea3ng Halbach\" width=\"521\" height=\"358\" \/><\/p>\n<p>Khi m\u1ee5c ti\u00eau l\u00e0 t\u1ed1i \u0111a h\u00f3a m\u1eadt \u0111\u1ed9 t\u1eeb tr\u01b0\u1eddng t\u1eeb trong m\u1ed9t footprint nh\u1ecf g\u1ecdn, <strong>Neodymium Sintered (NdFeB)<\/strong> l\u00e0 ng\u01b0\u1eddi d\u1eabn \u0111\u1ea7u kh\u00f4ng \u0111\u1ed1i th\u1ee7. Trong h\u01a1n 14 n\u0103m thi\u1ebft k\u1ebf c\u00e1c t\u1ed5 h\u1ee3p t\u00f9y ch\u1ec9nh, ch\u00fang t\u00f4i \u0111\u00e3 nh\u1eadn th\u1ea5y m\u1ed9t <strong>m\u1ea3ng Halbach Neodymium<\/strong> cung c\u1ea5p t\u1ef7 l\u1ec7 hi\u1ec7u su\u1ea5t tr\u00ean tr\u1ecdng l\u01b0\u1ee3ng cao nh\u1ea5t c\u00f3 s\u1eb5n. Nh\u1eefng <strong>pa\u0301t nam ch\u00e2m v\u0129nh vi\u1ec5n \u0111\u1ea5t hi\u1ebfm<\/strong> \u0111i\u1ec1u n\u00e0y s\u1edf h\u1eefu \u0111\u1ed9 t\u1eeb d\u01b0 c\u1ef1c cao (Br) c\u1ea7n thi\u1ebft \u0111\u1ec3 duy tr\u00ec c\u00e1c t\u01b0\u01a1ng t\u00e1c tr\u01b0\u1eddng ph\u1ee9c t\u1ea1p c\u1ee7a c\u1ea5u h\u00ecnh Halbach, mang l\u1ea1i k\u00fd hi\u1ec7u <strong>on-one-sided flux concentration<\/strong> l\u00e0 m\u1ea1nh h\u01a1n t\u1eeb 1,4x \u0111\u1ebfn 2x so v\u1edbi b\u1ed1 tr\u00ed th\u00f4ng th\u01b0\u1eddng.<\/p>\n<h3>T\u1ea1i sao NdFeB chi\u1ebfm \u01b0u th\u1ebf trong c\u00e1c m\u1ea3ng hi\u1ec7u su\u1ea5t cao<\/h3>\n<p>C\u1ea5u tr\u00fac h\u00ecnh h\u1ecdc c\u1ee7a m\u1ed9t m\u1ea3ng Halbach bu\u1ed9c tr\u01b0\u1eddng t\u1eeb \u0111\u1ed1i x\u1ee9ng n\u1ed9i b\u1ed9 v\u1edbi nhau. V\u1eadt li\u1ec7u y\u1ebfu s\u1ebd ch\u1ecbu \u0111\u1ef1ng \u00e1p l\u1ef1c n\u00e0y v\u00e0 m\u1ea5t t\u1eeb. NdFeB nung k\u1ebft \u00edt b\u1ecb m\u1ea5t t\u1eeb h\u01a1n h\u1ea7u h\u1ebft c\u00e1c v\u1eadt li\u1ec7u \u1edf nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng, l\u00e0m cho n\u00f3 tr\u1edf th\u00e0nh l\u1ef1a ch\u1ecdn ch\u00ednh cho \u0111\u1ed9ng c\u01a1 EV, robotics v\u00e0 m\u00e1y c\u00f4ng nghi\u1ec7p c\u00f4ng ngh\u1ec7 cao.<\/p>\n<h3>C\u00e1c c\u1ea5p \u0111\u1ed9 \u0111\u1ec1 ngh\u1ecb cho t\u1ed1i \u01b0u h\u00f3a<\/h3>\n<p>Ch\u1ecdn c\u1ea5p \u0111\u1ed9 ph\u00f9 h\u1ee3p r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 c\u00e2n b\u1eb1ng chi ph\u00ed v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng. Ch\u00fang t\u00f4i th\u01b0\u1eddng khuy\u1ebfn ngh\u1ecb c\u00e1c <strong>c\u1ea5p \u0111\u1ed9 NdFeB nung k\u1ebft N52<\/strong> v\u00e0 c\u00e1c c\u1ea5p \u0111\u1ed9 kh\u00e1c d\u1ef1a tr\u00ean \u1ee9ng d\u1ee5ng:<\/p>\n<ul>\n<li><strong>N50 \u2013 N54:<\/strong> S\u1ea3n ph\u1ea9m n\u0103ng l\u01b0\u1ee3ng cao nh\u1ea5t (l\u00ean \u0111\u1ebfn 52 MGOe). T\u1ed1t nh\u1ea5t cho c\u00e1c \u1ee9ng d\u1ee5ng gi\u1eef c\u1ed1 \u0111\u1ecbnh ho\u1eb7c khi gi\u1edbi h\u1ea1n k\u00edch th\u01b0\u1edbc r\u1ea5t nghi\u00eam ng\u1eb7t.<\/li>\n<li><strong>N42 \u2013 N45:<\/strong> Ng\u1ef1a l\u00e0m vi\u1ec7c c\u1ee7a ng\u00e0nh c\u00f4ng nghi\u1ec7p. Cung c\u1ea5p s\u1ef1 c\u00e2n b\u1eb1ng \u0111\u00e1ng tin c\u1eady gi\u1eefa \u0111\u1ed9 b\u1eabn cao v\u00e0 t\u00ednh kinh t\u1ebf cho \u1ee9ng d\u1ee5ng t\u1ed5ng qu\u00e1t <strong>m\u1ea3ng Halbach tuy\u1ebfn t\u00ednh<\/strong>.<\/li>\n<li><strong>N48H \/ N42SH:<\/strong> C\u00e1c lo\u1ea1i \u0111\u1ed9 c\u1ee9ng t\u1eeb t\u00ednh cao \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u1ed9ng nh\u01b0 rotor. Ch\u00fang ch\u1ed1ng b\u1ecb m\u1ea5t t\u1eeb khi t\u1ed5 h\u1ee3p n\u00f3ng l\u00ean trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh.<\/li>\n<\/ul>\n<p>\u0110\u1ec3 \u0111\u1ea3m b\u1ea3o m\u1ea3ng c\u1ee7a b\u1ea1n ho\u1ea1t \u0111\u1ed9ng theo d\u1ef1 \u0111o\u00e1n, x\u00e1c nh\u1eadn s\u1ef1 <a href=\"https:\/\/nbaem.com\/vi\/quality-of-neodymium-magnets\/\" target=\"_blank\" rel=\"noopener\">ch\u1ea5t l\u01b0\u1ee3ng nam ch\u00e2m Neodymium<\/a> l\u00e0 thi\u1ebft y\u1ebfu, v\u00ec s\u1ef1 kh\u00f4ng nh\u1ea5t qu\u00e1n trong c\u1ea5u tr\u00fac h\u1ea1t c\u00f3 th\u1ec3 l\u00e0m r\u1ed1i lo\u1ea1n \u0111\u1ed9 \u0111\u1ed3ng nh\u1ea5t tr\u01b0\u1eddng c\u1ea7n thi\u1ebft cho c\u00e1c c\u00e0i \u0111\u1eb7t Halbach.<\/p>\n<h3>Qu\u1ea3n l\u00fd gi\u1edbi h\u1ea1n nhi\u1ec7t \u0111\u1ed9 v\u00e0 l\u1edbp ph\u1ee7<\/h3>\n<p>M\u1eb7c d\u00f9 NdFeB m\u1ea1nh m\u1ebd, n\u00f3 c\u00f3 hai \u0111i\u1ec3m y\u1ebfu ch\u00ednh l\u00e0 nhi\u1ec7t v\u00e0 \u0103n m\u00f2n. C\u00e1c c\u1ea5p N ti\u00eau chu\u1ea9n b\u1eaft \u0111\u1ea7u gi\u1ea3m c\u00f4ng su\u1ea5t t\u1eeb t\u00ednh \u1edf nhi\u1ec7t \u0111\u1ed9 tr\u00ean 80\u00b0C. \u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng c\u00f3 ma s\u00e1t ho\u1eb7c \u0111i\u1ec7n tr\u1edf (nh\u01b0 stator \u0111\u1ed9ng c\u01a1), ch\u00fang t\u00f4i s\u1eed d\u1ee5ng c\u00e1c d\u00f2ng nhi\u1ec7t \u0111\u1ed9 cao (M, H, SH, UH, EH) ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh l\u00ean t\u1edbi 230\u00b0C.<\/p>\n<p>H\u01a1n n\u1eefa, NdFeB sinter ch\u1ee9a s\u1eaft, khi\u1ebfn n\u00f3 d\u1ec5 b\u1ecb g\u1ec9. Ch\u00fang t\u00f4i \u00e1p d\u1ee5ng c\u00e1c l\u1edbp x\u1eed l\u00fd b\u1ec1 m\u1eb7t chuy\u00ean bi\u1ec7t \u0111\u1ec3 b\u1ea3o v\u1ec7 t\u1ed5 h\u1ee3p:<\/p>\n<ul>\n<li><strong>Ni-Cu-Ni (Nickel):<\/strong> L\u1edbp ph\u1ee7 b\u1ec1n ti\u00eau chu\u1ea9n cho h\u1ea7u h\u1ebft c\u00e1c m\u00f4i tr\u01b0\u1eddng.<\/li>\n<li><strong>K\u1ebdm:<\/strong> Kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n t\u1ed1t h\u01a1n trong m\u1ed9t s\u1ed1 m\u00f4i tr\u01b0\u1eddng c\u00f4ng nghi\u1ec7p nh\u1ea5t \u0111\u1ecbnh.<\/li>\n<li><strong>epoxy<\/strong> L\u00fd t\u01b0\u1edfng khi nam ch\u00e2m ti\u1ebfp x\u00fac v\u1edbi \u0111\u1ed9 \u1ea9m ho\u1eb7c phun mu\u1ed1i.<\/li>\n<\/ul>\n<h2>Samarium Cobalt (SmCo): The Heat Survivor<\/h2>\n<div id=\"attachment_3648\" style=\"width: 479px\" class=\"wp-caption alignnone\"><img decoding=\"async\" aria-describedby=\"caption-attachment-3648\" class=\"wp-image-3648\" src=\"https:\/\/nbaem.com\/wp-content\/uploads\/2026\/01\/Xnip2026-01-12_12-12-03.jpg\" alt=\"M\u1ea3ng Halbach Samari-\u0110\u1ed3ng h\u1ed5 tr\u1ee3 b\u1eb1ng Samari-Coban\" width=\"469\" height=\"398\" srcset=\"https:\/\/nbaem.com\/wp-content\/uploads\/2026\/01\/Xnip2026-01-12_12-12-03-14x12.jpg 14w, https:\/\/nbaem.com\/wp-content\/uploads\/2026\/01\/Xnip2026-01-12_12-12-03-200x170.jpg 200w, https:\/\/nbaem.com\/wp-content\/uploads\/2026\/01\/Xnip2026-01-12_12-12-03-300x255.jpg 300w, https:\/\/nbaem.com\/wp-content\/uploads\/2026\/01\/Xnip2026-01-12_12-12-03-400x340.jpg 400w, https:\/\/nbaem.com\/wp-content\/uploads\/2026\/01\/Xnip2026-01-12_12-12-03-600x509.jpg 600w, https:\/\/nbaem.com\/wp-content\/uploads\/2026\/01\/Xnip2026-01-12_12-12-03.jpg 602w\" sizes=\"(max-width: 469px) 100vw, 469px\" \/><p id=\"caption-attachment-3648\" class=\"wp-caption-text\">M\u1ea3ng Halbach Samari-\u0110\u1ed3ng h\u1ed5 tr\u1ee3 b\u1eb1ng Samari-Coban<\/p><\/div>\n<p>Khi m\u00f4i tr\u01b0\u1eddng v\u1eadn h\u00e0nh qu\u00e1 n\u00f3ng \u0111\u1ed1i v\u1edbi Neodymium, ch\u00fang ta chuy\u1ec3n sang Samarium Cobalt (SmCo). A <strong>Samarium Cobalt Halbach<\/strong> m\u1ea3ng l\u00e0 ti\u00eau chu\u1ea9n ng\u00e0nh cho c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u hi\u1ec7u su\u1ea5t \u1ed5n \u0111\u1ecbnh d\u01b0\u1edbi nhi\u1ec7t \u0111\u1ed9 cao. Trong khi NdFeB m\u1ea5t s\u1ee9c m\u1ea1nh nhanh ch\u00f3ng \u1edf tr\u00ean 200\u00b0C, c\u00e1c c\u1ea5p \u0111\u1ed9 SmCo c\u1ee7a ch\u00fang t\u00f4i v\u1eabn duy tr\u00ec m\u1eadt \u0111\u1ed9 t\u1eeb tr\u01b0\u1eddng v\u00e0 ch\u1ed1ng m\u1ea5t t\u1eeb t\u00ednh \u1edf nhi\u1ec7t \u0111\u1ed9 l\u00ean t\u1edbi <strong>300\u00b0C \u0111\u1ebfn 350\u00b0C<\/strong>. \u0110i\u1ec1u n\u00e0y khi\u1ebfn ch\u00fang tr\u1edf n\u00ean thi\u1ebft y\u1ebfu cho c\u00e1c rotor h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5 t\u1ed1c \u0111\u1ed9 cao v\u00e0 \u0111\u1ed9ng c\u01a1 c\u00f4ng nghi\u1ec7p n\u01a1i s\u1ef1 sinh nhi\u1ec7t l\u00e0 kh\u00f4ng th\u1ec3 tr\u00e1nh kh\u1ecfi.<\/p>\n<h3>SmCo5 so v\u1edbi Sm2Co17: L\u1ef1a ch\u1ecdn c\u1ea5p \u0111\u1ed9 ph\u00f9 h\u1ee3p<\/h3>\n<p>Vi\u1ec7c ch\u1ecdn th\u00e0nh ph\u1ea7n h\u1ee3p kim c\u1ee5 th\u1ec3 l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c l\u1eafp r\u00e1p c\u1ee7a b\u1ea1n.<\/p>\n<ul>\n<li><strong>SmCo5 (D\u00e3y 1:5):<\/strong> Cung c\u1ea5p kh\u1ea3 n\u0103ng kh\u1ed1ng ch\u1ebf t\u1eeb t\u00ednh tuy\u1ec7t v\u1eddi nh\u01b0ng s\u1ea3n ph\u1ea9m n\u0103ng l\u01b0\u1ee3ng h\u01a1i th\u1ea5p h\u01a1n (th\u01b0\u1eddng l\u00e0 16-25 MGOe).<\/li>\n<li><strong>Sm2Co17 (D\u00e3y 2:17):<\/strong> L\u1ef1a ch\u1ecdn \u0111\u01b0\u1ee3c \u01b0a th\u00edch cho h\u1ea7u h\u1ebft c\u00e1c m\u1ea3ng hi\u1ec7u su\u1ea5t cao hi\u1ec7n \u0111\u1ea1i. N\u00f3 mang l\u1ea1i \u0111\u1ed9 m\u1ea1nh t\u1eeb cao h\u01a1n (l\u00ean t\u1edbi 32 MGOe) v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t t\u1ed1t h\u01a1n so v\u1edbi d\u00e3y 1:5.<\/li>\n<\/ul>\n<h3>Hi\u1ec7u su\u1ea5t trong m\u00f4i tr\u01b0\u1eddng \u0103n m\u00f2n<\/h3>\n<p>M\u1ed9t trong nh\u1eefng l\u1ee3i th\u1ebf l\u1edbn nh\u1ea5t c\u1ee7a SmCo l\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng oxy h\u00f3a t\u1ef1 nhi\u00ean c\u1ee7a n\u00f3. Kh\u00f4ng gi\u1ed1ng nh\u01b0 Neodymium, c\u1ea7n l\u1edbp ph\u1ee7 d\u00e0y, SmCo v\u1ed1n \u0111\u00e3 \u1ed5n \u0111\u1ecbnh.<\/p>\n<p>&nbsp;<\/p>\n<h2>V\u1eadt li\u1ec7u thay th\u1ebf: Khi n\u00e0o n\u00ean d\u00f9ng ch\u00fang<\/h2>\n<p>Trong khi nam ch\u00e2m hi\u1ebfm \u0111\u1ea5t sintered th\u1ed1ng tr\u1ecb c\u00e1c \u1ee9ng d\u1ee5ng hi\u1ec7u su\u1ea5t cao, c\u00e1c h\u1ea1n ch\u1ebf k\u1ef9 thu\u1eadt nh\u1ea5t \u0111\u1ecbnh \u0111\u00f4i khi ch\u1ec9 ch\u00fang ta v\u1ec1 c\u00e1c t\u00f9y ch\u1ecdn thay th\u1ebf t\u1eeb <a href=\"https:\/\/nbaem.com\/vi\/magnets-materials\/\" target=\"_blank\" rel=\"noopener\">d\u00f2ng v\u1eadt li\u1ec7u nam ch\u00e2m phong ph\u00fa c\u1ee7a ch\u00fang t\u00f4i<\/a>.<\/p>\n<h3>NdFeB Li\u00ean K\u1ebft cho C\u00e1c M\u1eabu H\u00ecnh Ph\u1ee9c T\u1ea1p<\/h3>\n<p>Khi m\u1ed9t thi\u1ebft k\u1ebf \u0111\u00f2i h\u1ecfi c\u00e1c h\u00ecnh h\u1ecdc ph\u1ee9c t\u1ea1p m\u00e0 c\u00e1c kh\u1ed1i sintered kh\u00f4ng th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c, NdFeB Li\u00ean K\u1ebft l\u00e0 gi\u1ea3i ph\u00e1p. V\u00ec ch\u00fang \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1eb1ng c\u00e1ch tr\u1ed9n b\u1ed9t t\u1eeb t\u00ednh v\u1edbi ch\u1ea5t k\u1ebft d\u00ednh polymer, ch\u00fang ta c\u00f3 th\u1ec3 \u0111\u00fac \u00e9p ch\u00fang th\u00e0nh c\u00e1c th\u00e0nh ph\u1ea7n ph\u1ee9c t\u1ea1p, d\u1ea1ng h\u00ecnh net. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t h\u1eefu \u00edch cho c\u00e1c m\u1ea3ng Halbach h\u00ecnh tr\u00f2n trong \u0111\u1ed9ng c\u01a1 ch\u00ednh x\u00e1c nh\u1ecf, n\u01a1i vi\u1ec7c l\u1eafp r\u00e1p c\u00e1c ph\u1ea7n gh\u00e9p d\u00e1n ri\u00eang l\u1ebb l\u00e0 b\u1ea5t kh\u1ea3 thi. M\u1eb7c d\u00f9 s\u1ea3n ph\u1ea9m n\u0103ng l\u01b0\u1ee3ng th\u1ea5p h\u01a1n so v\u1edbi c\u1ea5p sintered, kh\u1ea3 n\u0103ng t\u1ea1o m\u1eabu t\u1eeb t\u00ednh nhi\u1ec1u c\u1ef1c tr\u1ef1c ti\u1ebfp tr\u00ean m\u1ed9t v\u00e0nh duy nh\u1ea5t th\u01b0\u1eddng b\u00f9 \u0111\u1eafp cho thi\u1ebfu h\u1ee5t s\u1ee9c m\u1ea1nh th\u00f4 trong c\u00e1c thi\u1ebft b\u1ecb mini.<\/p>\n<h3>T\u1ea1i sao Ferrite v\u00e0 Alnico Hi\u1ebfm Khi Ph\u00f9 H\u1ee3p<\/h3>\n<p>Ch\u00fang t\u00f4i th\u01b0\u1eddng khuy\u00ean kh\u00f4ng n\u00ean s\u1eed d\u1ee5ng Ferrite (g\u1ed1m) ho\u1eb7c Alnico cho c\u00e1c c\u1ea5u h\u00ecnh Halbach tr\u1eeb khi c\u00f3 c\u00e1c bi\u1ebfn s\u1ed1 chi ph\u00ed th\u1ea5p ho\u1eb7c nhi\u1ec7t \u0111\u1ed9 cao \u0111\u1eb7c th\u00f9.<\/p>\n<ul>\n<li><strong>S\u1eaft t\u1eeb:<\/strong> V\u1edbi s\u1ea3n ph\u1ea9m n\u0103ng l\u01b0\u1ee3ng th\u1ea5p (kho\u1ea3ng 3.4\u20134.5 MGOe), nam ch\u00e2m Ferrite g\u1eb7p kh\u00f3 kh\u0103n trong vi\u1ec7c t\u1ea1o ra s\u1ef1 t\u1eadp trung flux m\u1ea1nh m\u1ebd \u0111\u1ecbnh ngh\u0129a m\u1ed9t m\u1ea3ng Halbach. L\u1ee3i th\u1ebf hi\u1ec7u n\u0103ng th\u01b0\u1eddng kh\u00f4ng bi\u1ec7n minh cho n\u1ed7 l\u1ef1c l\u1eafp r\u00e1p ph\u1ee9c t\u1ea1p.<\/li>\n<li><strong>Alnico:<\/strong> Trong khi Alnico c\u00f3 t\u1eeb d\u01b0 cao, \u0111\u1ed9 c\u01b0\u1ee1ng h\u1ed3i th\u1ea5p khi\u1ebfn n\u00f3 d\u1ec5 b\u1ecb kh\u1eed t\u1eeb. Trong m\u1ed9t m\u1ea3ng Halbach, nam ch\u00e2m b\u1ecb \u00e9p v\u00e0o \u0111\u1ed1i kh\u00e1ng; Alnico th\u01b0\u1eddng kh\u00f4ng th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c c\u00e1c tr\u01b0\u1eddng \u0111\u1ed1i kh\u00e1ng n\u1ed9i t\u1ea1i n\u00e0y m\u00e0 kh\u00f4ng m\u1ea5t \u0111i\u1ec7n t\u00edch.<\/li>\n<\/ul>\n<h3>C\u1ea1nh tranh v\u1ec1 Gi\u00e1 v\u00e0 Hi\u1ec7u Su\u1ea5t<\/h3>\n<p>L\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u ph\u00f9 h\u1ee3p l\u00e0 c\u00e2n b\u1eb1ng gi\u1eefa m\u1eadt \u0111\u1ed9 t\u1eeb th\u00f4ng v\u00e0 ng\u00e2n s\u00e1ch. Neodymium sintered mang l\u1ea1i hi\u1ec7u su\u1ea5t t\u1ed1t nh\u1ea5t tr\u00ean \u0111\u1ed3ng ti\u1ec1n cho c\u00e1c tr\u01b0\u1eddng m\u1ea1nh, trong khi Ferrite c\u00f3 chi ph\u00ed nguy\u00ean li\u1ec7u th\u1ea5p nh\u1ea5t nh\u01b0ng d\u1eabn t\u1edbi h\u1ec7 th\u1ed1ng to h\u01a1n v\u00e0 y\u1ebfu h\u01a1n \u0111\u00e1ng k\u1ec3. \u0110\u1ed1i v\u1edbi h\u1ea7u h\u1ebft kh\u00e1ch h\u00e0ng c\u1ea7n c\u00e1c m\u1ea3ng ng\u1eafn g\u1ecdn, hi\u1ec7u qu\u1ea3 cao, m\u1ee9c gi\u00e1 cho v\u1eadt li\u1ec7u \u0111\u1ea5t hi\u1ebfm l\u00e0 kho\u1ea3n \u0111\u1ea7u t\u01b0 c\u1ea7n thi\u1ebft \u0111\u1ec3 lo\u1ea1i b\u1ecf t\u1ea5m l\u01b0ng s\u1eaft n\u1eb7ng v\u00e0 t\u1ed1i \u0111a h\u00f3a t\u1ef7 l\u1ec7 c\u00f4ng su\u1ea5t\/tr\u1ecdng l\u01b0\u1ee3ng.<\/p>\n<h2>\u0110\u1ed1i \u0111\u1ea7u: NdFeB vs. SmCo<\/h2>\n<p>Khi ch\u00fang ta thi\u1ebft k\u1ebf hi\u1ec7u su\u1ea5t cao <a href=\"https:\/\/nbaem.com\/vi\/products\/magnet-assembly\/\" target=\"_blank\" rel=\"noopener\">c\u00e1c l\u1eafp gh\u00e9p nam ch\u00e2m<\/a>, l\u1ef1a ch\u1ecdn cho c\u00e1c c\u1ea5u h\u00ecnh Halbach h\u1ea7u nh\u01b0 lu\u00f4n thu h\u1eb9p xu\u1ed1ng c\u00f2n hai \u1ee9ng vi\u00ean: Neodymium sintered (NdFeB) v\u00e0 Samarium Cobalt (SmCo). Trong khi c\u1ea3 hai \u0111\u1ec1u l\u00e0 nam ch\u00e2m v\u0129nh vi\u1ec5n \u0111\u1ea5t hi\u1ebfm c\u00f3 th\u1ec3 duy tr\u00ec tr\u01b0\u1eddng t\u1eeb ph\u1ee9c t\u1ea1p c\u1ea7n cho m\u1ed9t m\u1ea3ng Halbach, ch\u00fang ph\u1ee5c v\u1ee5 c\u00e1c \u01b0u ti\u00ean k\u1ef9 thu\u1eadt kh\u00e1c nhau.<\/p>\n<h3>So s\u00e1nh S\u1ea3n ph\u1ea9m N\u0103ng L\u01b0\u1ee3ng T\u1ed1i \u0110a (MGOe)<\/h3>\n<p>Cho c\u00e1c \u1ee9ng d\u1ee5ng m\u00e0 k\u00edch th\u01b0\u1edbc v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng l\u00e0 h\u1ea1n ch\u1ebf ch\u00ednh, <strong>NdFeB vs Halbach c\u1ee7a SmCo<\/strong> so s\u00e1nh nghi\u00eang v\u1ec1 Neodymium m\u1ed9t c\u00e1ch m\u1ea1nh<\/p>\n<ul>\n<li><strong>NdFeB:<\/strong> \u0110\u00e2y l\u00e0 \u00f4ng vua b\u1ea5t ch\u1ea5p v\u1ec1 s\u1ee9c m\u1ea1nh. C\u00e1c c\u1ea5p N54 c\u1ee7a ch\u00fang t\u00f4i \u0111\u1ea1t s\u1ea3n ph\u1ea9m n\u0103ng l\u01b0\u1ee3ng l\u00ean t\u1edbi <strong>52 MGOe<\/strong>. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p ch\u00fang t\u00f4i x\u00e2y d\u1ef1ng c\u00e1c m\u1ea3ng nh\u1ecf g\u1ecdn cung c\u1ea5p m\u1eadt \u0111\u1ed9 flux l\u1edbn (t\u0103ng 1,4x \u0111\u1ebfn 2x trong c\u00e1c thi\u1ebft k\u1ebf Halbach c\u1ee7a ch\u00fang t\u00f4i).<\/li>\n<li><strong>SmCo:<\/strong> M\u1eb7c d\u00f9 c\u00f3 s\u1ee9c m\u1ea1nh, Samarium Cobalt \u0111\u1ea1t t\u1ed1i \u0111a kho\u1ea3ng <strong>32 MGOe<\/strong>. \u0110\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng t\u1eeb t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi m\u1ed9t m\u1ea3ng Neodymium, m\u1ed9t m\u1ea3ng SmCo s\u1ebd c\u1ea7n c\u00f3 k\u00edch th\u01b0\u1edbc v\u1eadt l\u00fd l\u1edbn h\u01a1n.<\/li>\n<\/ul>\n<h3>Ph\u00e2n t\u00edch chi ph\u00ed v\u00e0 Kh\u00e1ng Demagnetization<\/h3>\n<p>c\u1ea3 <strong>n\u0103ng l\u01b0\u1ee3ng t\u1eeb MGOe<\/strong> kh\u00f4ng ph\u1ea3i l\u00e0 y\u1ebfu t\u1ed1 duy nh\u1ea5t. <strong>\u00e1p l\u1ef1c l\u00e0m m\u1ea5t t\u1eeb c\u1ee7a m\u1ea3ng Halbach<\/strong> r\u1ee7i ro t\u0103ng l\u00ean \u0111\u00e1ng k\u1ec3 khi c\u00f3 nhi\u1ec7t.<\/p>\n<ul>\n<li><strong>\u1ed4n \u0111\u1ecbnh nhi\u1ec7t:<\/strong> SmCo l\u00e0 \u201cnh\u00e0 s\u1ed1ng s\u00f3t \u1edf nhi\u1ec7t.\u201d N\u00f3 duy tr\u00ec hi\u1ec7u su\u1ea5t cho \u0111\u1ebfn <strong>350\u00b0C<\/strong> v\u1edbi t\u1ed5n th\u1ea5t d\u1ecbch nh\u1ecf. NdFeB nh\u1ea1y c\u1ea3m h\u01a1n; c\u00e1c c\u1ea5p chu\u1ea9n m\u1ea5t c\u01b0\u1eddng \u0111\u1ed9 nhanh tr\u00ean 80\u00b0C, m\u1eb7c d\u00f9 c\u00e1c c\u1ea5p \u0111\u1eb7c bi\u1ec7t ch\u1ecbu nhi\u1ec7t cao c\u1ee7a ch\u00fang t\u00f4i c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u1ebfn 230\u00b0C.<\/li>\n<li><strong>Ng\u00e2n s\u00e1ch:<\/strong> NdFeB nh\u00ecn chung cung c\u1ea5p t\u1ef7 l\u1ec7 gi\u00e1-tr\u00ean-hi\u1ec7u su\u1ea5t t\u1ed1t h\u01a1n. SmCo \u0111\u1eaft h\u01a1n do chi ph\u00ed nguy\u00ean li\u1ec7u (Cobalt) v\u00e0 kh\u00f3 gia c\u00f4ng, khi\u1ebfn n\u00f3 l\u00e0 l\u1ef1a ch\u1ecdn cao c\u1ea5p d\u00e0nh cho m\u00f4i tr\u01b0\u1eddng kh\u1eafc nghi\u1ec7t.<\/li>\n<\/ul>\n<h3>Th\u00f4ng s\u1ed1 nhanh: H\u01b0\u1edbng d\u1eabn L\u1ef1a ch\u1ecdn V\u1eadt li\u1ec7u<\/h3>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: left;\">\u0110\u1eb7c \u0111i\u1ec3m<\/th>\n<th style=\"text-align: left;\">Neodymium Sintered (NdFeB)<\/th>\n<th style=\"text-align: left;\">Cobalt Samari (SmCo)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: left;\"><strong>\u0110\u1ed9 m\u1ea1nh t\u1eeb t\u00ednh<\/strong><\/td>\n<td style=\"text-align: left;\">R\u1ea5t Cao (33\u201352 MGOe)<\/td>\n<td style=\"text-align: left;\">Cao (16\u201332 MGOe)<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Nhi\u1ec7t \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng t\u1ed1i \u0111a<\/strong><\/td>\n<td style=\"text-align: left;\">80\u00b0C \u2013 230\u00b0C (Grade ph\u1ee5 thu\u1ed9c)<\/td>\n<td style=\"text-align: left;\">300\u00b0C \u2013 350\u00b0C<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Ch\u1ed1ng \u0103n m\u00f2n<\/strong><\/td>\n<td style=\"text-align: left;\">Th\u1ea5p (Y\u00eau c\u1ea7u ph\u1ee7 Ni\/Zn)<\/td>\n<td style=\"text-align: left;\">Xu\u1ea5t s\u1eafc (kh\u00f4ng c\u1ea7n l\u1edbp ph\u1ee7)<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Kh\u00e1ng demagnetization<\/strong><\/td>\n<td style=\"text-align: left;\">Cao (c\u00e1c d\u00f2ng Hci cao c\u00f3 s\u1eb5n)<\/td>\n<td style=\"text-align: left;\">R\u1ea5t Cao (V\u00f4 c\u00f9ng \u1ed5n \u0111\u1ecbnh)<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Ph\u00f9 h\u1ee3p cho<\/strong><\/td>\n<td style=\"text-align: left;\">\u0110\u1ed9ng c\u01a1 EV, Robotics, C\u00f4ng ngh\u1ec7 ti\u00eau d\u00f9ng<\/td>\n<td style=\"text-align: left;\">H\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5, Bi\u1ec3n, C\u00f4ng nghi\u1ec7p \u1edf nhi\u1ec7t \u0111\u1ed9 cao<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Ti\u00eau ch\u00ed l\u1ef1a ch\u1ecdn quan tr\u1ecdng cho d\u1ef1 \u00e1n c\u1ee7a b\u1ea1n<\/h2>\n<p>L\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u ph\u00f9 h\u1ee3p cho m\u1ed9t l\u1eafp gh\u00e9p Halbach t\u00f9y ch\u1ec9nh kh\u00f4ng ch\u1ec9 l\u00e0 picking nam ch\u00e2m m\u1ea1nh nh\u1ea5t tr\u00ean datasheet. Ch\u00fang t\u00f4i ti\u1ebfp c\u1eadn m\u1ecdi d\u1ef1 \u00e1n b\u1eb1ng c\u00e1ch c\u00e2n b\u1eb1ng ba y\u1ebfu t\u1ed1 kh\u00f4ng th\u1ec3 th\u01b0\u01a1ng l\u01b0\u1ee3ng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o m\u1ea3ng ho\u1ea1t \u0111\u1ed9ng \u0111\u00e1ng tin c\u1eady trong su\u1ed1t v\u00f2ng \u0111\u1eddi.<\/p>\n<h3>X\u00e1c \u0111\u1ecbnh ph\u1ea1m vi nhi\u1ec7t \u0111\u1ed9 v\u1eadn h\u00e0nh<\/h3>\n<p>\u1ed4n \u0111\u1ecbnh nhi\u1ec7t \u0111\u1ed9 l\u00e0 c\u00e2u h\u1ecfi \u0111\u1ea7u ti\u00ean ch\u00fang t\u00f4i \u0111\u1eb7t ra. Nam ch\u00e2m Neodymium ti\u00eau chu\u1ea9n m\u1ea5t hi\u1ec7u su\u1ea5t nhanh ch\u00f3ng n\u1ebfu nhi\u1ec7t \u0111\u1ed9 t\u0103ng v\u01b0\u1ee3t qu\u00e1 x\u1ebfp h\u1ea1ng c\u1ea5p c\u1ee7a ch\u00fang.<\/p>\n<ul>\n<li><strong>\u1ee8ng d\u1ee5ng ti\u00eau chu\u1ea9n:<\/strong> \u0110\u1ed1i v\u1edbi m\u00f4i tr\u01b0\u1eddng d\u01b0\u1edbi 80\u00b0C, NdFeB c\u1ea5p N ti\u00eau chu\u1ea9n mang l\u1ea1i t\u1ef7 l\u1ec7 c\u00f4ng su\u1ea5t tr\u00ean tr\u1ecdng l\u01b0\u1ee3ng t\u1ed1t nh\u1ea5t.<\/li>\n<li><strong>\u1ee8ng d\u1ee5ng ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao:<\/strong> N\u1ebfu \u0111\u1ed9ng c\u01a1 ho\u1eb7c b\u1ed9 gh\u00e9p c\u1ea3m bi\u1ebfn c\u1ee7a b\u1ea1n ho\u1ea1t \u0111\u1ed9ng \u1edf kho\u1ea3ng 150\u00b0C \u0111\u1ebfn 230\u00b0C, ch\u00fang t\u00f4i n\u00e2ng c\u1ea5p l\u00ean series Neodymium UH ho\u1eb7c EH.<\/li>\n<li><strong>Nhi\u1ec7t \u0111\u1ed9 c\u1ef1c cao:<\/strong> Khi v\u01b0\u1ee3t qua 300\u00b0C, ch\u00fang t\u00f4i chuy\u1ec3n ho\u00e0n to\u00e0n sang <a href=\"https:\/\/nbaem.com\/vi\/samarium-cobalt-magnet-data-sheet\/\" target=\"_blank\" rel=\"noopener\">Cobalt Samari (SmCo)<\/a>, \u0111i\u1ec1u n\u00e0y duy tr\u00ec s\u1ef1 \u1ed5n \u0111\u1ecbnh \u0111\u1ebfn 350\u00b0C m\u00e0 kh\u00f4ng m\u1ea5t t\u1eeb t\u00ednh m\u1ed9t c\u00e1ch kh\u00f4ng th\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c.<\/li>\n<\/ul>\n<h3>\u0110\u00e1nh gi\u00e1 c\u00e1c y\u1ebfu t\u1ed1 m\u00f4i tr\u01b0\u1eddng<\/h3>\n<p>M\u00f4i tr\u01b0\u1eddng v\u1eadt l\u00fd quy\u1ebft \u0111\u1ecbnh tu\u1ed5i th\u1ecd c\u1ee7a m\u1ea3ng. Neodymium gi\u00e0u s\u1eaft v\u00e0 d\u1ec5 \u0103n m\u00f2n trong \u0111i\u1ec1u ki\u1ec7n \u1ea9m \u01b0\u1edbt, \u0111\u00f2i h\u1ecfi l\u1edbp ph\u1ee7 m\u1ea1nh nh\u01b0 Nickel-Copper-Nickel, Zinc, ho\u1eb7c Epoxy. \u0110\u1ed1i v\u1edbi m\u00f4i tr\u01b0\u1eddng ch\u00e2n kh\u00f4ng ho\u1eb7c \u1ee9ng d\u1ee5ng h\u00e0ng h\u1ea3i n\u01a1i l\u1edbp ph\u1ee7 c\u00f3 th\u1ec3 b\u1ecb h\u1ecfng ho\u1eb7c tho\u00e1t kh\u00ed, SmCo v\u01b0\u1ee3t tr\u1ed9i v\u00ec n\u00f3 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n t\u1ef1 nhi\u00ean m\u00e0 kh\u00f4ng c\u1ea7n b\u1ea3o v\u1ec7 th\u00eam.<\/p>\n<h3>Y\u00eau c\u1ea7u C\u01b0\u1eddng \u0111\u1ed9 t\u1eeb tr\u01b0\u1eddng v\u00e0 \u0110\u1ed9 \u0111\u1ed3ng \u0111\u1ec1u<\/h3>\n<p>M\u1ea3ng Halbach \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 khu\u1ebfch \u0111\u1ea1i lu\u1ed3ng t\u1eeb \u1edf m\u1ed9t b\u00ean trong khi tri\u1ec7t ti\u00eau \u1edf ph\u00eda kia. \u0110\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ee9c t\u0103ng m\u1eadt \u0111\u1ed9 t\u1eeb tr\u01b0\u1eddng t\u1eeb 1.4x \u0111\u1ebfn 2x m\u00e0 ch\u00fang ta th\u01b0\u1eddng th\u1ea5y, s\u1ef1 \u0111\u1ed3ng \u0111\u1ec1u c\u1ee7a c\u00e1c \u0111\u1eb7c t\u00ednh t\u1eeb l\u00e0 r\u1ea5t quan tr\u1ecdng.<\/p>\n<ul>\n<li><strong>M\u1ea1nh nh\u1ea5t:<\/strong> N\u1ebfu m\u1ee5c ti\u00eau l\u00e0 l\u1ef1c gi\u1eef ho\u1eb7c m\u00f4-men xo\u1eafn l\u1edbn nh\u1ea5t c\u00f3 th\u1ec3 trong kh\u00f4ng gian nh\u1ecf, ch\u00fang t\u00f4i s\u1eed d\u1ee5ng NdFeB N52 ho\u1eb7c N54 ch\u1ea5t l\u01b0\u1ee3ng cao.<\/li>\n<li><strong>C\u00e1c tr\u01b0\u1eddng Ch\u00ednh x\u00e1c:<\/strong> \u0110\u1ed1i v\u1edbi c\u1ea3m bi\u1ebfn ho\u1eb7c b\u1ed9 gia t\u1ed1c h\u1ea1t \u0111\u00f2i h\u1ecfi s\u1ef1 \u1ed5n \u0111\u1ecbnh c\u1ef1c k\u1ef3 <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>, ch\u00fang t\u00f4i \u01b0u ti\u00ean v\u1eadt li\u1ec7u c\u00f3 \u0111\u1ed9 c\u01b0\u1ee1ng ch\u1ebf n\u1ed9i t\u1ea1i nh\u1ea5t qu\u00e1n (Hci) \u0111\u1ec3 ng\u0103n ng\u1eeba m\u1ea5t t\u1eeb c\u1ee5c b\u1ed9 trong c\u1ea5u tr\u00fac m\u1ea3ng.<\/li>\n<\/ul>\n<h2>\u1ee8ng d\u1ee5ng th\u1ef1c t\u1ebf v\u00e0 s\u1ef1 ph\u00f9 h\u1ee3p c\u1ee7a v\u1eadt li\u1ec7u<\/h2>\n<p>Ch\u1ecdn th\u00e0nh ph\u1ea7n nam ch\u00e2m ph\u00f9 h\u1ee3p kh\u00f4ng ch\u1ec9 d\u1ef1a v\u00e0o s\u1ee9c m\u1ea1nh th\u00f4; n\u00f3 c\u00f2n l\u00e0 s\u1ef1 ph\u1ed1i h\u1ee3p ph\u00f9 h\u1ee3p gi\u1eefa c\u00e1c y\u1ebfu t\u1ed1 \u0111\u1ec3 ... <strong>M\u1ea3ng Halbach<\/strong> \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u c\u1ee5 th\u1ec3 c\u1ee7a m\u00f4i tr\u01b0\u1eddng v\u1eadn h\u00e0nh. Ch\u00fang t\u00f4i thi\u1ebft k\u1ebf c\u00e1c t\u1ed5 h\u1ee3p nam ch\u00e2m t\u00f9y ch\u1ec9nh, n\u01a1i l\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u quy\u1ebft \u0111\u1ecbnh tu\u1ed5i th\u1ecd v\u00e0 hi\u1ec7u qu\u1ea3 c\u1ee7a h\u1ec7 th\u1ed1ng cu\u1ed1i c\u00f9ng.<\/p>\n<h3>\u0110\u1ed9ng c\u01a1 xe \u0111i\u1ec7n v\u00e0 drone (NdFeB)<\/h3>\n<p>Trong c\u00e1c ng\u00e0nh EV v\u00e0 drone, t\u1ef7 l\u1ec7 c\u00f4ng su\u1ea5t tr\u00ean tr\u1ecdng l\u01b0\u1ee3ng l\u00e0 y\u1ebfu t\u1ed1 quy\u1ebft \u0111\u1ecbnh. A <strong>m\u1ea3ng Halbach Neodymium<\/strong> l\u00e0 s\u1ef1 l\u1ef1a ch\u1ecdn chu\u1ea9n \u1edf \u0111\u00e2y v\u00ec n\u00f3 mang l\u1ea1i m\u1eadt \u0111\u1ed9 t\u1eeb th\u00f4ng t\u1eeb tr\u01b0\u1eddng cao nh\u1ea5t c\u00f3 s\u1eb5n\u2014l\u00ean t\u1edbi <strong>52 MGOe<\/strong>B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u1ea5u h\u00ecnh Halbach, ta c\u00f3 th\u1ec3 t\u1eadp trung t\u1eeb tr\u01b0\u1eddng t\u1eeb t\u00ednh ho\u00e0n to\u00e0n l\u00ean m\u1eb7t l\u00e0m vi\u1ec7c, th\u01b0\u1eddng lo\u1ea1i b\u1ecf nhu c\u1ea7u s\u1eed d\u1ee5ng t\u1ea5m l\u01b0ng b\u1eb1ng th\u00e9p n\u1eb7ng. \u0110i\u1ec1u n\u00e0y l\u00e0m gi\u1ea3m t\u1ed5ng tr\u1ecdng l\u01b0\u1ee3ng \u0111\u1ed9ng c\u01a1 l\u00ean t\u1edbi 20% \u0111\u1ed3ng th\u1eddi t\u0103ng m\u00f4-men xo\u1eafn.<\/p>\n<ul>\n<li><strong>V\u1eadt li\u1ec7u:<\/strong> N\u1ed9i sinh h\u1ecdc NdFeB (C\u1ea5p \u0111\u1ed9 N45SH, N52).<\/li>\n<li><strong>L\u1ee3i \u00edch:<\/strong> \u0110\u1ed9 \u0111\u1eb7c c\u1ef1c \u0111\u1ea1i c\u1ee7a m\u00f4-men xo\u1eafn v\u00e0 thi\u1ebft k\u1ebf nh\u1eb9 nh\u1ea5t<\/li>\n<li><strong>Tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng:<\/strong> V\u00f2ng quay t\u1ed1c \u0111\u1ed9 cao v\u00e0 <a href=\"https:\/\/nbaem.com\/vi\/magnets-used-in-industrial\/\">\u1ee9ng d\u1ee5ng nam ch\u00e2m c\u00f4ng nghi\u1ec7p<\/a> \u0111\u00f2i h\u1ecfi hi\u1ec7u qu\u1ea3 n\u00e9n g\u1ecdn<\/li>\n<\/ul>\n<h3>H\u1ec7 th\u1ed1ng h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5 v\u00e0 Qu\u1ed1c ph\u00f2ng (SmCo)<\/h3>\n<p>Khi thi\u1ebft b\u1ecb ph\u1ea3i ch\u1ecbu t\u1ea3i nhi\u1ec7t c\u1ef1c \u0111oan, nam ch\u00e2m ti\u00eau chu\u1ea9n s\u1ebd g\u1eb7p s\u1ef1 c\u1ed1. \u0110\u1ed1i v\u1edbi c\u00e1c b\u1ed9 truy\u1ec1n \u0111\u1ed9ng h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5 v\u00e0 h\u1ec7 th\u1ed1ng qu\u1ed1c ph\u00f2ng, ch\u00fang ta d\u1ef1a v\u00e0o <strong>Samarium Cobalt Halbach<\/strong> c\u00e1c t\u1ed5 h\u1ee3p. Nh\u1eefng v\u1eadt li\u1ec7u n\u00e0y duy tr\u00ec s\u1ef1 \u1ed5n \u0111\u1ecbnh t\u1eeb t\u00ednh \u1edf nhi\u1ec7t \u0111\u1ed9 dao \u0111\u1ed9ng t\u1eeb <strong>300\u00b0C \u0111\u1ebfn 350\u00b0C<\/strong>. Kh\u00e1c v\u1edbi Neodymium, SmCo c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n t\u1ef1 nhi\u00ean, l\u00e0m cho n\u00f3 thi\u1ebft y\u1ebfu cho c\u00e1c m\u00f4i tr\u01b0\u1eddng ph\u01a1i nhi\u1ec5m ho\u1eb7c ch\u00e2n kh\u00f4ng m\u00e0 l\u1edbp ph\u1ee7 b\u1ea3o v\u1ec7 c\u00f3 th\u1ec3 b\u1ecb xu\u1ed1ng c\u1ea5p.<\/p>\n<h3>Ch\u1ee5p \u1ea3nh y t\u1ebf v\u00e0 V\u00f2ng \u0111\u1ec7m t\u1eeb<\/h3>\n<p>\u0110\u1ed9 ch\u00ednh x\u00e1c l\u00e0 \u01b0u ti\u00ean h\u00e0ng \u0111\u1ea7u cho c\u00e1c thi\u1ebft b\u1ecb y t\u1ebf. <strong>C\u00e1c d\u00e3y Halbach tuy\u1ebfn t\u00ednh<\/strong> th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong v\u00f2ng \u0111\u1ec7m t\u1eeb v\u00e0 m\u00e1y gia t\u1ed1c h\u1ea1t \u0111\u1ec3 t\u1ea1o tr\u01b0\u1eddng m\u1ea1nh, \u0111\u1ed3ng nh\u1ea5t v\u00e0 t\u1ef1 che ch\u1eafn.<\/p>\n<ul>\n<li><strong>V\u00f2ng \u0111\u1ec7m t\u1eeb:<\/strong> S\u1eed d\u1ee5ng NdFeB cho kh\u1ea3 n\u0103ng ch\u1ecbu t\u1ea3i cao ho\u1eb7c SmCo cho s\u1ef1 \u1ed5n \u0111\u1ecbnh kh\u00e1ng ti\u1ec7t tr\u00f9ng.<\/li>\n<li><strong>Ch\u1ee5p \u1ea3nh:<\/strong> Y\u00eau c\u1ea7u s\u1ef1 thay \u0111\u1ed5i h\u01b0\u1edbng ch\u00ednh x\u00e1c \u1edf 90\u00b0 m\u00e0 \u0111\u1ed9i ng\u0169 k\u1ef9 thu\u1eadt c\u1ee7a ch\u00fang t\u00f4i cung c\u1ea5p \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o s\u1ef1 \u0111\u1ed3ng nh\u1ea5t c\u1ee7a tr\u01b0\u1eddng.<\/li>\n<\/ul>\n<p>Kh\u1edbp v\u1edbi v\u1eadt li\u1ec7u v\u1edbi \u1ee9ng d\u1ee5ng s\u1ebd \u0111\u1ea3m b\u1ea3o b\u1ea1n nh\u1eadn \u0111\u01b0\u1ee3c <strong>Hi\u1ec7u su\u1ea5t t\u0103ng t\u1eeb 1,4x \u0111\u1ebfn 2x<\/strong> r\u1eb1ng m\u1ed9t m\u1ea3ng Halbach \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u00fang s\u1ebd h\u1ee9a h\u1eb9n.<\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 v\u1eadt li\u1ec7u m\u1ea3ng Halbach<\/h2>\n<h3>T\u00f4i c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng nam ch\u00e2m ceramic cho m\u1ed9t m\u1ea3ng Halbach kh\u00f4ng?<\/h3>\n<p>V\u00e2ng, b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng <strong>nam ch\u00e2m g\u1ed1m (ferrite)<\/strong>, nh\u01b0ng ch\u00fang th\u01b0\u1eddng d\u00e0nh cho c\u00e1c \u1ee9ng d\u1ee5ng c\u00f3 chi ph\u00ed nh\u1ea1y c\u1ea3m n\u01a1i tr\u1ecdng l\u01b0\u1ee3ng v\u00e0 k\u00edch th\u01b0\u1edbc kh\u00f4ng ph\u1ea3i r\u00e0ng bu\u1ed9c quan tr\u1ecdng. Trong khi ferrite c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u1eb7ng v\u00e0 demagnetization t\u1ed1t, n\u00f3 <strong>N\u0103ng l\u01b0\u1ee3ng t\u1ed1i \u0111a (MGOe)<\/strong> th\u1ea5p h\u01a1n \u0111\u00e1ng k\u1ec3 (th\u00f4ng th\u01b0\u1eddng t\u1eeb 3,4\u20134,5 MGOe) so v\u1edbi c\u00e1c t\u00f9y ch\u1ecdn \u0111\u1ea5t hi\u1ebfm.<\/p>\n<p>N\u1ebfu d\u1ef1 \u00e1n c\u1ee7a b\u1ea1n y\u00eau c\u1ea7u thi\u1ebft k\u1ebf nh\u1ecf g\u1ecdn v\u1edbi l\u1ef1c gi\u1eef cao, ch\u00fang t\u00f4i th\u01b0\u1eddng \u0111\u1ec1 xu\u1ea5t n\u00e2ng c\u1ea5p v\u1eadt li\u1ec7u. B\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y kho\u1ea3ng c\u00e1ch hi\u1ec7u su\u1ea5t trong b\u1ea3ng ph\u00e2n t\u00edch chi ti\u1ebft c\u1ee7a ch\u00fang t\u00f4i <a href=\"https:\/\/nbaem.com\/vi\/ferrite-magnet-vs-neodymium\/\" target=\"_blank\" rel=\"noopener\">nam ch\u00e2m ferrite so v\u1edbi neodymium<\/a>, nh\u1ea5n m\u1ea1nh t\u1ea1i sao v\u1eadt li\u1ec7u \u0111\u1ea5t hi\u1ebfm l\u00e0 ti\u00eau chu\u1ea9n cho hi\u1ec7u su\u1ea5t cao <strong>m\u1ea3ng Halbach tuy\u1ebfn t\u00ednh<\/strong>.<\/p>\n<h3>H magnet-grade m\u1ea1nh nh\u1ea5t l\u00e0 g\u00ec cho Halbach?<\/h3>\n<p>\u0110\u1ec3 t\u1ed1i \u0111a h\u00f3a m\u1eadt \u0111\u1ed9 t\u1eeb tr\u01b0\u1eddng, <strong>Neodymium Sintered (NdFeB)<\/strong> l\u00e0 s\u1ef1 l\u1ef1a ch\u1ecdn \u01b0u vi\u1ec7t. T\u1ea1i NBAEM, ch\u00fang t\u00f4i s\u1ea3n xu\u1ea5t c\u00e1c lo\u1ea1i t\u1edbi <strong>N52 v\u00e0 N54<\/strong>, hi\u1ec7n nay cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng t\u1eeb t\u00ednh cao nh\u1ea5t c\u00f3 s\u1eb5n tr\u00ean th\u1ecb tr\u01b0\u1eddng.<\/p>\n<p>S\u1eed d\u1ee5ng c\u00e1c c\u1ea5p cao c\u1ea5p n\u00e0y trong m\u1ed9t <strong>m\u1ea3ng Halbach neodymium<\/strong> cho ph\u00e9p ch\u00fang t\u00f4i \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ef1 t\u1eadp trung t\u1eeb tr\u01b0\u1eddng l\u00e0 <strong>1,4x \u0111\u1ebfn 2x cao h\u01a1n<\/strong> so v\u1edbi c\u00e1c l\u1eafp gh\u00e9p nam ch\u00e2m th\u00f4ng th\u01b0\u1eddng. \u0110i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng cho c\u00e1c \u1ee9ng d\u1ee5ng nh\u01b0 rotor t\u1ed1c \u0111\u1ed9 cao ho\u1eb7c <strong>\u1ed5 \u0111\u1ee1 t\u1eeb tr\u01b0\u1eddng<\/strong> n\u01a1i b\u1ea1n c\u1ea7n tr\u01b0\u1eddng m\u1ea1nh nh\u1ea5t c\u00f3 th\u1ec3 trong bao b\u00ec nh\u1ecf nh\u1ea5t c\u00f3 th\u1ec3.<\/p>\n<h3>Nhi\u1ec7t \u1ea3nh h\u01b0\u1edfng nh\u01b0 th\u1ebf n\u00e0o \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a m\u1ea3ng Halbach?<\/h3>\n<p>Qu\u1ea3n l\u00fd nhi\u1ec7t r\u1ea5t quan tr\u1ecdng v\u00ec c\u00e1c tr\u01b0\u1eddng \u0111\u1ed1i ngh\u1ecbch ph\u1ee9c t\u1ea1p trong c\u1ea5u h\u00ecnh Halbach t\u1ea1o ra \u00e1p l\u1ef1c n\u1ed9i t\u1ea1i cao. N\u1ebfu nhi\u1ec7t \u0111\u1ed9 v\u1eadn h\u00e0nh v\u01b0\u1ee3t qu\u00e1 m\u1ee9c x\u1ebfp h\u1ea1ng c\u1ee7a nam ch\u00e2m, b\u1ea1n \u0111\u1ed1i m\u1eb7t v\u1edbi nguy c\u01a1 m\u1ea5t t\u1eeb t\u1eeb <strong>\u00e1p l\u1ef1c l\u00e0m m\u1ea5t t\u1eeb c\u1ee7a m\u1ea3ng Halbach<\/strong>.<\/p>\n<ul>\n<li><strong>NdFeB chu\u1ea9n:<\/strong> M\u1ea5t \u0111\u1ed9 b\u1ec1n nhanh ch\u00f3ng tr\u00ean 80\u00b0C (tr\u1eeb khi s\u1eed d\u1ee5ng c\u00e1c lo\u1ea1i c\u1ea5p cao nhi\u1ec7t nh\u01b0 UH ho\u1eb7c EH).<\/li>\n<li><strong>Samarium Cobalt (SmCo):<\/strong> Gi\u1eef \u1ed5n \u0111\u1ecbnh l\u00ean \u0111\u1ebfn <strong>300\u00b0C\u2013350\u00b0C<\/strong>.<\/li>\n<\/ul>\n<p>\u0110\u1ed1i v\u1edbi m\u00f4i tr\u01b0\u1eddng c\u00f3 nhi\u1ec7t \u0111\u1ed9 c\u1ef1c cao, nh\u01b0 turbine h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5 ho\u1eb7c \u0111\u1ed9ng c\u01a1 c\u00f4ng nghi\u1ec7p, ch\u00fang t\u00f4i \u01b0u ti\u00ean <strong>kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t c\u1ee7a m\u1ea3ng Halbach<\/strong> b\u1eb1ng c\u00e1ch ch\u1ec9 \u0111\u1ecbnh SmCo thay cho NdFeB \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u1ed5 h\u1ee3p gi\u1eef \u0111\u01b0\u1ee3c t\u00ednh ch\u1ea5t t\u1eeb theo th\u1eddi gian.<\/p>\n<div id=\"references\" class=\"min-w-0 scroll-mt-8 overflow-hidden\">\n<div class=\"text-[16px]\">\n<h2 id=\"references\" class=\"mb-2 mt-2 scroll-mt-24 font-serif text-[1.714286em] font-semibold border-border-l1 pb-1 border-b overflow-hidden\"><\/h2>\n<\/div>\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\u00e1c v\u1eadt li\u1ec7u nam ch\u00e2m t\u1ed1t nh\u1ea5t cho c\u00e1c m\u1ea3ng Halbach so s\u00e1nh NdFeB v\u00e0 SmCo v\u1ec1 s\u1ee9c m\u1ea1nh, \u1ed5n \u0111\u1ecbnh nhi\u1ec7t v\u00e0 nhu c\u1ea7u \u1ee9ng d\u1ee5ng<\/p>","protected":false},"author":1,"featured_media":3636,"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":[35],"tags":[],"class_list":["post-3637","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-halbach-array"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/nbaem.com\/wp-content\/uploads\/2026\/01\/what_magnet_materials_are_best_for_Halbach_arrays__1.webp","_links":{"self":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/3637","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=3637"}],"version-history":[{"count":1,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/3637\/revisions"}],"predecessor-version":[{"id":3649,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/3637\/revisions\/3649"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media\/3636"}],"wp:attachment":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media?parent=3637"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/categories?post=3637"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/tags?post=3637"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}