{"id":3726,"date":"2026-03-12T07:36:24","date_gmt":"2026-03-12T07:36:24","guid":{"rendered":"https:\/\/nbaem.com\/?p=3726"},"modified":"2026-03-11T05:46:19","modified_gmt":"2026-03-11T05:46:19","slug":"cause-demagnetization-in-permanent-magnet-motors","status":"publish","type":"post","link":"https:\/\/nbaem.com\/vi\/cause-demagnetization-in-permanent-magnet-motors\/","title":{"rendered":"Nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0o c\u00f3 th\u1ec3 g\u00e2y m\u1ea5t t\u1eeb t\u00ednh \u1edf \u0111\u1ed9ng c\u01a1 nam ch\u00e2m v\u0129nh c\u1eedu"},"content":{"rendered":"<h2>C\u01a1 h\u1ecdc c\u1ee7a m\u1ea5t t\u1eeb t\u1eeb t\u1eeb tr\u01b0\u1eddng: Hi\u1ec3u \u0111\u01b0\u1eddng cong B-H<\/h2>\n<div id=\"attachment_1663\" style=\"width: 1034px\" class=\"wp-caption alignnone\"><img decoding=\"async\" aria-describedby=\"caption-attachment-1663\" class=\"size-large wp-image-1663\" src=\"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/05\/35SH-BH-curve-1024x699.jpg\" alt=\"\u0110\u01b0\u1eddng cong BH 35SH\" width=\"1024\" height=\"699\" srcset=\"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/05\/35SH-BH-curve-200x137.jpg 200w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/05\/35SH-BH-curve-300x205.jpg 300w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/05\/35SH-BH-curve-400x273.jpg 400w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/05\/35SH-BH-curve-600x410.jpg 600w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/05\/35SH-BH-curve-768x525.jpg 768w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/05\/35SH-BH-curve-800x546.jpg 800w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/05\/35SH-BH-curve-1024x699.jpg 1024w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/05\/35SH-BH-curve-1200x820.jpg 1200w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/05\/35SH-BH-curve.jpg 1249w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><p id=\"caption-attachment-1663\" class=\"wp-caption-text\">\u0110\u01b0\u1eddng cong BH 35SH<\/p><\/div>\n<p>&nbsp;<\/p>\n<p>B\u1ea1n \u0111\u00e3 t\u1eebng \u0111\u1ed1i m\u1eb7t v\u1edbi m\u1ed9t \u0111\u1ed9ng c\u01a1 hi\u1ec7u su\u1ea5t k\u00e9m v\u00e0 t\u1ef1 h\u1ecfi ch\u00ednh x\u00e1c \u0111i\u1ec1u g\u00ec c\u00f3 th\u1ec3 g\u00e2y ra s\u1ef1 m\u1ea5t from t\u1eeb t\u00ednh trong \u0111\u1ed9ng c\u01a1 nam ch\u00e2m v\u0129nh c\u1eedu? \u0110\u1ec3 kh\u1eafc ph\u1ee5c hi\u1ec7u qu\u1ea3, ch\u00fang ta ph\u1ea3i xem tr\u01b0\u1edbc c\u00e1c v\u1eadt l\u00fd c\u01a1 b\u1ea3n c\u1ee7a v\u1eadt li\u1ec7u t\u1eeb t\u00ednh. C\u00e2u tr\u1ea3 l\u1eddi n\u1eb1m trong \u0111\u01b0\u1eddng cong m\u1ea5t t\u1eeb B-H.<\/p>\n<h3>Gi\u1ea3i m\u00e3 \u0110\u01b0\u1eddng cong M\u1ea5t t\u1eeb<\/h3>\n<p>Khi ph\u00e2n t\u00edch s\u1ef1 xu\u1ed1ng c\u1ea5p c\u1ee7a \u0111\u1ed9ng c\u01a1, c\u00e1c k\u1ef9 s\u01b0 xem x\u00e9t k\u1ef9 l\u01b0\u1ee1ng g\u00f3c th\u1ee9 hai c\u1ee7a \u0111\u01b0\u1eddng cong B-H. Ph\u1ea7n c\u1ee5 th\u1ec3 n\u00e0y, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u0111\u01b0\u1eddng cong m\u1ea5t t\u1eeb, m\u00f4 t\u1ea3 c\u00e1ch nam ch\u00e2m v\u0129nh c\u1eedu ph\u1ea3n \u1ee9ng khi ch\u1ecbu m\u1ed9t tr\u01b0\u1eddng t\u1eeb \u0111\u1ed1i l\u1eadp. N\u00f3 m\u00f4 ph\u1ecfng ch\u00ednh x\u00e1c ng\u01b0\u1ee1ng v\u00e0 \u0111i\u1ec1u ki\u1ec7n m\u00e0 khi \u0111\u00f3 nam ch\u00e2m s\u1ebd b\u1eaft \u0111\u1ea7u m\u1ea5t s\u1ee9c m\u1ea1nh v\u1eadn h\u00e0nh b\u00ean trong khe h gap c\u1ee7a \u0111\u1ed9ng c\u01a1.<\/p>\n<h3>C\u00e1c Ch\u1ec9 s\u1ed1 T\u1eeb t\u00ednh Ch\u00ednh<\/h3>\n<p>\u0110\u1ec3 \u0111\u00e1nh gi\u00e1 ch\u00ednh x\u00e1c r\u1ee7i ro m\u1ea5t t\u1eeb th\u00f4ng, ch\u00fang ta d\u1ef1a v\u00e0o hai t\u00ednh ch\u1ea5t v\u1eadt li\u1ec7u quan tr\u1ecdng:<\/p>\n<ul>\n<li><strong>\u0110\u1ed9 gi\u1eef t\u1eeb (Br):<\/strong> \u0110i\u1ec1u n\u00e0y \u0111\u1ecbnh ngh\u0129a m\u1eadt \u0111\u1ed9 t\u1eeb tr\u01b0\u1eddng d\u01b0 c\u00f2n l\u1ea1i b\u1ecb \u0111\u1ec3 l\u1ea1i trong v\u1eadt li\u1ec7u sau khi tr\u01b0\u1eddng t\u1eeb h\u00f3a b\u00ean ngo\u00e0i ban \u0111\u1ea7u b\u1ecb lo\u1ea1i b\u1ecf. N\u00f3i c\u00e1ch kh\u00e1c, n\u00f3 \u0111\u1ea1i di\u1ec7n cho s\u1ee9c m\u1ea1nh n\u1ec1n t\u1ed1i \u0111a c\u1ee7a nam ch\u00e2m.<\/li>\n<li><strong>L\u1ef1c c\u01b0\u1ee1ng Intrinsic (Hci):<\/strong> \u0110\u00e2y l\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u1ea5t t\u1eeb c\u1ee7a v\u1eadt li\u1ec7u \u1edf m\u1ee9c t\u1ed1i \u0111a. Hci c\u00e0ng cao cho th\u1ea5y nam ch\u00e2m c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c tr\u01b0\u1eddng t\u1eeb \u0111\u1ed1i kh\u00e1ng m\u1ea1nh h\u01a1n tr\u01b0\u1edbc khi b\u1ecb m\u1ea5t c\u1ef1 ly \u0111\u1ecbnh h\u01b0\u1edbng t\u1eeb b\u00ean trong m\u1ed9t c\u00e1ch v\u0129nh vi\u1ec5n.<\/li>\n<\/ul>\n<h3>Nguy c\u01a1 c\u1ee7a \u0110i\u1ec3m g\u1ed1i<\/h3>\n<p>T\u00ednh n\u0103ng d\u1ec5 b\u1ecb t\u1ed5n th\u01b0\u01a1ng nh\u1ea5t tr\u00ean \u0111\u01b0\u1eddng cong m\u1ea5t t\u1eeb B-H l\u00e0 \u201c\u0111i\u1ec3m g\u1ed1i\u201d. \u0110\u00e2y l\u00e0 v\u1ecb tr\u00ed ch\u00ednh x\u00e1c n\u01a1i ph\u1ea7n tuy\u1ebfn t\u00ednh c\u1ee7a \u0111\u01b0\u1eddng cong gi\u1ea3m m\u1ea1nh.<\/p>\n<p>Mi\u1ec5n l\u00e0 \u0111i\u1ec1u ki\u1ec7n v\u1eadn h\u00e0nh c\u1ee7a \u0111\u1ed9ng c\u01a1 gi\u1eef nam ch\u00e2m \u1edf tr\u00ean \u0111i\u1ec3m g\u1ed1i n\u00e0y, b\u1ea5t c\u1ee9 s\u1ef1 gi\u1ea3m \u0111\u1ed9t ng\u1ed9t flux n\u00e0o c\u0169ng c\u00f3 th\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c. Tuy nhi\u00ean, n\u1ebfu \u0111i\u1ec1u ki\u1ec7n c\u1ef1c \u0111oan \u0111\u1ea9y \u0111i\u1ec3m v\u1eadn h\u00e0nh xu\u1ed1ng d\u01b0\u1edbi g\u1ed1i, v\u1eadt li\u1ec7u s\u1ebd ch\u1ecbu <strong>m\u1ea5t t\u1eeb t\u00ednh v\u0129nh vi\u1ec5n<\/strong>. Khi m\u1ed9t \u0111i\u1ec3m v\u1eadn h\u00e0nh v\u01b0\u1ee3t qua ng\u01b0\u1ee1ng n\u00e0y, s\u1ef1 s\u1eafp x\u1ebfp c\u1ea5u tr\u00fac c\u1ee7a c\u00e1c mi\u1ec1n t\u1eeb t\u00ednh b\u1ecb ph\u00e1 v\u1ee1 v\u0129nh vi\u1ec5n. \u0110\u1ed9ng c\u01a1 s\u1ebd kh\u00f4ng ph\u1ee5c h\u1ed3i \u0111\u01b0\u1ee3c m\u00f4-men ho\u1eb7c hi\u1ec7u su\u1ea5t ban \u0111\u1ea7u k\u1ec3 c\u1ea3 khi l\u00e0m m\u00e1t ho\u1eb7c lo\u1ea1i b\u1ecf t\u1ea3i \u0111\u1ed1i kh\u00e1ng, d\u1eabn \u0111\u1ebfn suy gi\u1ea3m hi\u1ec7u su\u1ea5t v\u0129nh vi\u1ec5n.<\/p>\n<h2>Nh\u1eefng g\u00ec c\u00f3 th\u1ec3 g\u00e2y m\u1ea5t t\u1eeb t\u00ednh trong \u0111\u1ed9ng c\u01a1 nam ch\u00e2m v\u0129nh vi\u1ec5n?<\/h2>\n<p>Khi ch\u00fang ta x\u00e2y d\u1ef1ng v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 cho c\u00e1c h\u1ec7 d\u1eabn \u0111\u1ed9ng hi\u1ec7u su\u1ea5t cao, hi\u1ec3u \u0111\u01b0\u1ee3c ch\u00ednh x\u00e1c <strong>nh\u1eefng g\u00ec c\u00f3 th\u1ec3 g\u00e2y m\u1ea5t t\u1eeb t\u00ednh trong \u0111\u1ed9ng c\u01a1 nam ch\u00e2m v\u0129nh vi\u1ec5n<\/strong> l\u00e0 r\u1ea5t quan tr\u1ecdng. M\u1ed9t s\u1ef1 c\u1ed1 c\u1ee7a \u0111\u1ed9ng c\u01a1 \u0111\u1ed3ng b\u1ed9 nam ch\u00e2m v\u0129nh vi\u1ec5n (PMSM) th\u01b0\u1eddng g\u1eafn tr\u1ef1c ti\u1ebfp v\u1edbi m\u1ed9t v\u00e0i y\u1ebfu t\u1ed1 c\u0103ng th\u1eb3ng c\u1ed1t l\u00f5i \u0111\u00e3 ph\u00e1 h\u1ee7y m\u1ea1ch t\u1eeb. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 nh\u1eefng k\u1ebb g\u00e2y ra ch\u00ednh b\u1ea1n c\u1ea7n ch\u00fa \u00fd.<\/p>\n<h3>1. C\u0103ng th\u1eb3ng nhi\u1ec7t v\u00e0 qu\u00e1 nhi\u1ec7t<\/h3>\n<p>Nhi\u1ec7t l\u00e0 nguy\u00ean nh\u00e2n h\u00e0ng \u0111\u1ea7u c\u1ee7a <strong>m\u1ea5t t\u1eeb nhi\u1ec7t<\/strong>. Khi nhi\u1ec7t \u0111\u1ed9 b\u00ean trong t\u0103ng l\u00ean, \u0111\u1ed9ng n\u0103ng nguy\u00ean t\u1eed gia t\u0103ng, l\u00e0m cho s\u1ef1 c\u0103n ch\u1ec9nh \u0111\u1ecbnh h\u01b0\u1edbng c\u1ee7a c\u00e1c mi\u1ec1n t\u1eeb tr\u1edf n\u00ean r\u1ed1i lo\u1ea1n m\u1ed9t c\u00e1ch d\u1eef d\u1ed9i.<\/p>\n<p>Ch\u00fang t\u00f4i ph\u00e2n lo\u1ea1i s\u1ef1 h\u01b0 h\u1ecfng do nhi\u1ec7t th\u00e0nh hai lo\u1ea1i:<\/p>\n<ul>\n<li><strong>M\u1ea5t m\u00e1t c\u00f3 th\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c:<\/strong> Nam ch\u00e2m suy y\u1ebfu khi n\u00f3ng nh\u01b0ng ph\u1ee5c h\u1ed3i \u0111\u01b0\u1ee3c to\u00e0n b\u1ed9 s\u1ee9c m\u1ea1nh khi ngu\u1ed9i v\u1ec1 nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng.<\/li>\n<li><strong>M\u1ea5t t\u1eeb t\u00ednh b\u1ea5t h\u1ed3i<\/strong> Nhi\u1ec7t \u0111\u1ed9 v\u01b0\u1ee3t qua ng\u01b0\u1ee1ng t\u1edbi h\u1ea1n. Nam ch\u00e2m permanently m\u1ea5t s\u1ee9c m\u1ea1nh v\u00e0 y\u00eau c\u1ea7u Remagnetization ho\u00e0n to\u00e0n.<\/li>\n<\/ul>\n<p>B\u1ea1n ph\u1ea3i ph\u00e2n bi\u1ec7t gi\u1eefa nhi\u1ec7t \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng t\u1ed1i \u0111a c\u1ee7a nam ch\u00e2m v\u00e0 <strong>nhi\u1ec7t \u0111\u1ed9 Curie c\u1ee7a nam ch\u00e2m v\u0129nh vi\u1ec5n<\/strong> (Tc), \u0111\u00e2y l\u00e0 gi\u1edbi h\u1ea1n nhi\u1ec7t tuy\u1ec7t \u0111\u1ed1i n\u01a1i v\u1eadt li\u1ec7u m\u1ea5t \u0111i m\u1ecdi t\u1eeb t\u00ednh v\u0129nh vi\u1ec5n.<\/p>\n<p><strong>Samarium Cobalt so v\u1edbi Neodymium Gi\u1edbi h\u1ea1n Nhi\u1ec7t \u0111\u1ed9 Cao<\/strong><br \/>\n| V\u1eadt li\u1ec7u Nam ch\u00e2m | Nhi\u1ec7t \u0111\u1ed9 Ho\u1ea1t \u0111\u1ed9ng T\u1ed1i \u0111a | Nhi\u1ec7t \u0111\u1ed9 Curie ($T_c$) | S\u1ee9c b\u1ec1n M\u00f4i tr\u01b0\u1eddng |<br \/>\n| <strong>Standard NdFeB<\/strong> | 80\u00b0C \u2013 150\u00b0C | 310\u00b0C \u2013 350\u00b0C | S\u1ee9c m\u1ea1nh cao, \u0111\u1ed9 ch\u1ecbu nhi\u1ec7t th\u1ea5p |<br \/>\n| <strong>SmCo<\/strong> | 250\u00b0C \u2013 350\u00b0C | 700\u00b0C \u2013 800\u00b0C | S\u1ee9c m\u1ea1nh th\u1ea5p h\u01a1n, kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t c\u1ef1c cao |<\/p>\n<p>Hi\u1ec3u bi\u1ebft <a href=\"https:\/\/nbaem.com\/vi\/what-are-magnets-made-of\/\">nam ch\u00e2m l\u00e0m b\u1eb1ng g\u00ec<\/a> gi\u00fap b\u1ea1n ch\u1ecdn \u0111\u00fang v\u1eadt li\u1ec7u \u0111\u1ec3 tr\u00e1nh s\u1ef1 c\u1ed1 nhi\u1ec7t th\u1ea3i trong thi\u1ebft k\u1ebf \u0111\u1ed9ng c\u01a1 c\u1ee7a b\u1ea1n.<\/p>\n<h3>2. Tr\u01b0\u1eddng t\u1eeb ch\u1ed1ng l\u1ea1i<\/h3>\n<p>Trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh b\u00ecnh th\u01b0\u1eddng, cu\u1ed9n stator t\u1ea1o ra m\u1ed9t <strong>tr\u01b0\u1eddng t\u1eeb \u0111\u1ed1i kh\u00e1ng<\/strong>. Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y, t\u01b0\u01a1ng t\u1ef1 v\u1edbi <strong>ph\u1ea3n \u1ee9ng ph\u1ea7n \u1ee9ng trong \u0111\u1ed9ng c\u01a1 DC<\/strong>, t\u1ea1o ra m\u1ed9t l\u1ef1c \u0111\u1ea9y ng\u01b0\u1ee3c li\u00ean t\u1ee5c \u0111\u1ed1i v\u1edbi c\u00e1c nam ch\u00e2m v\u0129nh vi\u1ec5n.<\/p>\n<p>Tr\u1ea3 ng\u01b0\u1ee3c tr\u01b0\u1eddng tr\u1edf n\u00ean v\u00f4 c\u00f9ng ph\u00e1 h\u1ee7y trong \u0111i\u1ec1u ki\u1ec7n v\u1eadn h\u00e0nh b\u1ea5t th\u01b0\u1eddng:<\/p>\n<ul>\n<li>D\u1eebng quay m\u00e1y ho\u1eb7c kh\u00f3a roto<\/li>\n<li>Kh\u1edfi \u0111\u1ed9ng c\u1ee9ng, m\u00f4-men xo\u1eafn cao<\/li>\n<li>Qu\u00e1 t\u1ea3i c\u01a1 h\u1ecdc n\u1eb7ng<\/li>\n<li>B\u1ea5t ch\u1ee3t <strong>m\u1ea1ch ng\u1eafn stator c\u1ee7a \u0111\u1ed9ng c\u01a1<\/strong><\/li>\n<\/ul>\n<p>Nh\u1eefng s\u1ef1 ki\u1ec7n c\u1ef1c \u0111oan n\u00e0y k\u00edch ho\u1ea1t d\u00f2ng stator kh\u1ed5ng l\u1ed3. N\u1ebfu nh\u1eefng d\u00f2ng n\u00e0y \u0111\u1ea9y nam ch\u00e2m v\u01b0\u1ee3t qu\u00e1 <strong>l\u1ef1c kh\u00e1ng n\u1ed9i t\u1ea1i (Hci)<\/strong> , nam ch\u00e2m m\u1ea5t t\u1eeb t\u00ednh. R\u1ee7i ro n\u00e0y t\u0103ng v\u1ecdt n\u1ebfu \u0111\u1ed9ng c\u01a1 \u0111\u00e3 n\u00f3ng l\u00ean khi v\u1eadn h\u00e0nh.<\/p>\n<h3>3. Suy gi\u1ea3m v\u00e0 \u0103n m\u1ec9 m\u00f4i tr\u01b0\u1eddng<\/h3>\n<p><strong>S\u1ef1 suy gi\u1ea3m nam ch\u00e2m \u0111\u1ed9ng c\u01a1 xe \u0111i\u1ec7n<\/strong> th\u01b0\u1eddng b\u1eaft ngu\u1ed3n t\u1eeb s\u1ef1 b\u1ea3o v\u1ec7 m\u00f4i tr\u01b0\u1eddng k\u00e9m ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u1ed7i \u0111i\u1ec7n. Nh\u00f4m-nh\u00f4m (NdFeB) r\u1ea5t d\u1ec5 b\u1ecb oxy h\u00f3a v\u00e0 \u0111\u1ee9t g\u00e3y hydro.<\/p>\n<ul>\n<li><strong>Tr\u00f3c v\u1ecf v\u1eadt l\u00fd:<\/strong> Ti\u1ebfp x\u00fac v\u1edbi c\u00e1c h\u00f3a ch\u1ea5t c\u00f4ng nghi\u1ec7p, \u0111\u1ed9 \u1ea9m cao v\u00e0 kh\u00ed d\u1ec5 \u0103n m\u00f2n khi\u1ebfn nam ch\u00e2m m\u1ee5c v\u00e0 bong ra.<\/li>\n<li><strong>\u0110i\u1ec3m r\u1eddi g\u00f3c t\u1eeb tr\u01b0\u1eddng kh\u00f4ng kh\u00ed:<\/strong> B\u1ea5t k\u1ef3 t\u1ed5n th\u1ea5t th\u1ec3 t\u00edch v\u1eadt l\u00fd n\u00e0o t\u1eeb nam ch\u00e2m tr\u1ef1c ti\u1ebfp l\u00e0m gi\u1ea3m t\u1ed5ng \ufb02ux t\u1eeb xuy\u00ean qua kho\u1ea3ng kh\u00f4ng kh\u00ed c\u1ee7a \u0111\u1ed9ng c\u01a1, l\u00e0m m\u1ea5t m\u00f4-men xo\u1eafn.<\/li>\n<\/ul>\n<p>Tri\u1ec3n khai <strong>l\u1edbp ph\u1ee7 nam ch\u00e2m v\u00e0 \u0103n m\u1eeda<\/strong> s\u1ef1 kh\u00e1ng l\u1ea1i (nh\u01b0 Nickel-Copper-Nickel ho\u1eb7c l\u1edbp Ni-Quy epoxy b\u1ec1n) l\u00e0 v\u00f4 c\u00f9ng c\u1ea7n thi\u1ebft \u0111\u1ec3 ng\u0103n ch\u1eb7n s\u1ef1 xu\u1ed1ng c\u1ea5p ch\u1eadm n\u00e0y.<\/p>\n<h3>4. N\u0103ng l\u1ef1c ch\u1ecbu t\u1ea3i v\u00e0 \u1ea2nh h\u01b0\u1edfng l\u1eafp r\u00e1p<\/h3>\n<p>Nam ch\u00e2m n\u1ed5i ti\u1ebfng l\u00e0 d\u1ec5 v\u1ee1. C\u00e1c t\u00e1c \u0111\u1ed9ng v\u1eadt l\u00fd m\u1ea1nh, rung \u0111\u1ed9ng v\u1eadn h\u00e0nh kh\u1eafc nghi\u1ec7t ho\u1eb7c x\u1eed l\u00fd sai trong qu\u00e1 tr\u00ecnh l\u1eafp r\u00e1p t\u1ea1i nh\u00e0 m\u00e1y c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng l\u00e0m v\u1ee1 c\u00e1c v\u1eadt li\u1ec7u nh\u01b0 Ferrite ho\u1eb7c SmCo.<\/p>\n<ul>\n<li><strong>M\u00e0i m\u00f2n:<\/strong> Ngay c\u1ea3 m\u1ed9t v\u1ebft s\u1ee9t nh\u1ecf c\u0169ng l\u00e0m gi\u1ea3m th\u1ec3 t\u00edch t\u1ed5ng c\u1ee7a nam ch\u00e2m.<\/li>\n<li><strong>G\u00e2y r\u1ed1i m\u1ea1ch:<\/strong> Thi\u1ec7t h\u1ea1i v\u1eadt l\u00fd l\u00e0m bi\u1ebfn \u0111\u1ed5i m\u1ea1ch t\u1eeb \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n c\u1ea9n th\u1eadn, l\u00e0m m\u1ea5t c\u00e2n b\u1eb1ng \u0111\u1ed9ng c\u01a1 v\u0129nh vi\u1ec5n v\u00e0 l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t t\u1ed5ng th\u1ec3.<\/li>\n<\/ul>\n<h2>Ng\u0103n ch\u1eb7n m\u1ea5t t\u1eeb rotor trong thi\u1ebft k\u1ebf \u0111\u1ed9ng c\u01a1<\/h2>\n<p>\u0110\u1ec3 \u0111\u1ed1i ph\u00f3 hi\u1ec7u qu\u1ea3 <strong>nh\u1eefng g\u00ec c\u00f3 th\u1ec3 g\u00e2y m\u1ea5t t\u1eeb t\u00ednh trong \u0111\u1ed9ng c\u01a1 nam ch\u00e2m v\u0129nh vi\u1ec5n<\/strong>, ch\u00fang ta ph\u1ea3i gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 tr\u1ef1c ti\u1ebfp \u1edf c\u1ea5p \u0111\u1ed9 k\u1ef9 thu\u1eadt. X\u00e2y d\u1ef1ng c\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o v\u1ec7 v\u00e0o ki\u1ebfn tr\u00fac c\u1ee7a \u0111\u1ed9ng c\u01a1 l\u00e0 c\u00e1ch \u0111\u00e1ng tin c\u1eady nh\u1ea5t \u0111\u1ec3 ng\u0103n m\u1ea5t t\u1eeb rotor v\u00e0 duy tr\u00ec c\u00f4ng su\u1ea5t m\u00f4-men xo\u1eafn l\u00e2u d\u00e0i.<\/p>\n<p>\u0110\u00e2y l\u00e0 c\u00e1c chi\u1ebfn l\u01b0\u1ee3c thi\u1ebft k\u1ebf c\u1ed1t l\u00f5i ch\u00fang t\u00f4i s\u1eed d\u1ee5ng \u0111\u1ec3 b\u1ea3o v\u1ec7 m\u1ea1ch t\u1eeb:<\/p>\n<ul>\n<li><strong>T\u1ed1i \u01b0u h\u00f3a l\u00e0m m\u00e1t \u0111\u1ed9ng c\u01a1:<\/strong> Nhi\u1ec7t l\u00e0 m\u1ed1i \u0111e d\u1ecda l\u1edbn nh\u1ea5t \u0111\u1ed1i v\u1edbi s\u1ef1 \u1ed5n \u0111\u1ecbnh t\u1eeb. Ch\u00fang t\u00f4i khuy\u1ebfn ngh\u1ecb t\u00edch h\u1ee3p \u00e1o l\u00e0m m\u00e1t b\u1eb1ng ch\u1ea5t l\u1ecfng ho\u1eb7c thi\u1ebft k\u1ebf lu\u1ed3ng kh\u00ed t\u1ed1i \u01b0u th\u00f4ng qua v\u1ecf \u0111\u1ed9ng c\u01a1. Gi\u1eef nhi\u1ec7t l\u00f5i \u1edf m\u1ee9c d\u01b0\u1edbi gi\u1edbi h\u1ea1n nhi\u1ec7t \u0111\u1ed9 quan tr\u1ecdng l\u00e0 c\u00e1ch t\u1ed1t nh\u1ea5t \u0111\u1ec3 <a href=\"https:\/\/nbaem.com\/vi\/how-long-do-magnets-last\/\">k\u00e9o d\u00e0i th\u1eddi gian magnets t\u1ed3n t\u1ea1i<\/a> v\u00e0 tr\u00e1nh m\u1ea5t t\u1eeb tr\u01b0\u1eddng t\u1eeb t\u00ednh v\u0129nh vi\u1ec5n.<\/li>\n<li><strong>Chi\u1ebfn l\u01b0\u1ee3c ki\u1ec3m so\u00e1t ch\u1ee7 \u0111\u1ed9ng:<\/strong> Y\u00eau c\u1ea7u ph\u1ea7n c\u1ee9ng c\u00f3 ph\u1ea7n m\u1ec1m th\u00f4ng minh. B\u1eb1ng c\u00e1ch tri\u1ec3n khai c\u00e1c h\u1ec7 \u0111i\u1ec1u khi\u1ec3n \u0111\u1ed9ng c\u01a1 th\u00f4ng minh, ch\u00fang ta c\u00f3 th\u1ec3 gi\u1edbi h\u1ea1n t\u1eeb th\u00f4ng pha \u0111\u1ec9nh m\u1ed9t c\u00e1ch ch\u1ee7 \u0111\u1ed9ng. \u0110i\u1ec1u n\u00e0y ng\u0103n ng\u1eeba <strong>ph\u1ea3n \u1ee9ng ph\u1ea7n \u1ee9ng trong \u0111\u1ed9ng c\u01a1 DC<\/strong> v\u00e0 PMSMs, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong c\u00e1c t\u00ecnh hu\u1ed1ng r\u1ee7i ro cao nh\u01b0 \u0111i\u1ec1u ki\u1ec7n k\u1eb9t c\u1ee9ng kh\u00f3 kh\u0103n, qu\u00e1 t\u1ea3i n\u1eb7ng, ho\u1eb7c \u0111\u1ed9t <strong>m\u1ea1ch ng\u1eafn stator c\u1ee7a \u0111\u1ed9ng c\u01a1<\/strong>.<\/li>\n<li><strong>\u0110i\u1ec1u ch\u1ec9nh h\u00ecnh h\u1ecdc rotor:<\/strong> N\u01a1i b\u1ea1n \u0111\u1eb7t nam ch\u00e2m c\u00f3 \u1ea3nh h\u01b0\u1edfng. Thi\u1ebft k\u1ebf rotor v\u1edbi vi\u1ec7c ch\u00f4n nam ch\u00e2m s\u00e2u h\u01a1n\u2014th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c thi\u1ebft k\u1ebf \u0111\u1ed9ng c\u01a1 \u0111\u1ed3ng b\u1ed9 nam ch\u00e2m v\u0129nh vi\u1ec5n n\u1ed9i b\u1ed9 (PMSM)\u2014th\u00eam m\u1ed9t l\u1edbp b\u1ea3o v\u1ec7 v\u1eadt l\u00fd. \u0110\u1ecbnh h\u00ecnh n\u1ed9i b\u1ed9 n\u00e0y effectively b\u1ea3o v\u1ec7 nam ch\u00e2m kh\u1ecfi t\u00e1c \u0111\u1ed9ng tr\u1ef1c ti\u1ebfp c\u1ee7a c\u00e1c tr\u01b0\u1eddng t\u1eeb \u0111\u1ed1i l\u1eadp do cu\u1ed9n stator sinh ra.<\/li>\n<\/ul>\n<h2>Ch\u1ecdn v\u1eadt li\u1ec7u t\u1eeb ph\u00f9 h\u1ee3p v\u1edbi NBAEM<\/h2>\n<p>Ng\u0103n ng\u1eeba m\u1ea5t t\u1eeb b\u1eaft \u0111\u1ea7u ngay t\u1eeb ngu\u1ed3n. N\u1ebfu b\u1ea1n mu\u1ed1n <strong>ng\u0103n ng\u1eeba vi\u1ec7c m\u1ea5t t\u1eeb rotor<\/strong>, vi\u1ec7c ch\u1ecdn v\u1eadt li\u1ec7u th\u00f4 \u0111\u00fang l\u00e0 b\u1eaft bu\u1ed9c. T\u1ea1i NBAEM, ch\u00fang t\u00f4i x\u00e2y d\u1ef1ng s\u1ef1 b\u1ec1n b\u1ec9 v\u00e0o motor ngay t\u1eeb \u0111\u1ea7u \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o s\u1ef1 \u1ed5n \u0111\u1ecbnh l\u00e2u d\u00e0i.<\/p>\n<h3>Nam ch\u00e2m NdFeB c\u00f3 \u0111\u1ed9 c\u1ef1 tuy\u1ec7t cao so v\u1edbi SmCo<\/h3>\n<p>C\u00e1c v\u1eadt li\u1ec7u chu\u1ea9n th\u01b0\u1eddng th\u1ea5t b\u1ea1i d\u01b0\u1edbi t\u1ea3i tr\u1ecdng n\u1eb7ng v\u00e0 nhi\u1ec7t \u0111\u1ed9 cao. N\u00e2ng c\u1ea5p v\u1eadt li\u1ec7u t\u1eeb c\u1ee7a b\u1ea1n l\u00e0 c\u00e1ch tr\u1ef1c ti\u1ebfp nh\u1ea5t \u0111\u1ec3 ng\u0103n ch\u1eb7n s\u1ef1 m\u1ea5t t\u1eeb do nhi\u1ec7t \u1edf ngay hi\u1ec7n tr\u01b0\u1eddng.<\/p>\n<ul>\n<li><strong>N\u00e2ng c\u1ea5p NdFeB:<\/strong> Chuy\u1ec3n sang <strong>nam magnets NdFeB c\u00f3 khi\u1ebfu t\u1eeb t\u00ednh cao<\/strong> (gi\u1ed1ng nh\u01b0 d\u00f2ng UH, EH, ho\u1eb7c AH c\u1ee7a ch\u00fang t\u00f4i) n\u00e2ng gi\u1edbi h\u1ea1n nhi\u1ec7t l\u00ean \u0111\u00e1ng k\u1ec3. X\u00e1c minh <a href=\"https:\/\/nbaem.com\/vi\/quality-of-neodymium-magnets\/\">ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a nam ch\u00e2m neodymium<\/a> trong qu\u00e1 tr\u00ecnh mua h\u00e0ng l\u00e0 b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh, l\u00e2u d\u00e0i m\u00e0 kh\u00f4ng m\u1ea5t t\u1eeb th\u00f4ng b\u1ea5t ng\u1edd.<\/li>\n<li><strong>M\u00f4i tr\u01b0\u1eddng kh\u1eafc nghi\u1ec7t:<\/strong> Khi xem x\u00e9t <strong>samarium cobalt so v\u1edbi neodymium \u1edf nhi\u1ec7t \u0111\u1ed9 cao<\/strong> hi\u1ec7u su\u1ea5t, SmCo chi\u1ebfm \u01b0u th\u1ebf tuy\u1ec7t \u0111\u1ed1i. \u0110\u00e2y l\u00e0 l\u1ef1a ch\u1ecdn t\u1ed1i \u01b0u cho c\u00e1c \u1ee9ng d\u1ee5ng h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5 v\u00e0 ng\u0103n ng\u1eeba <strong>S\u1ef1 suy gi\u1ea3m nam ch\u00e2m \u0111\u1ed9ng c\u01a1 xe \u0111i\u1ec7n<\/strong> d\u01b0\u1edbi nhi\u1ec7t \u0111\u1ed9 c\u1ef1c \u0111oan, li\u00ean t\u1ee5c.<\/li>\n<\/ul>\n<h3>L\u1edbp ph\u1ee7 Nam ch\u00e2m v\u00e0 \u0103n m\u00f2n<\/h3>\n<p>Thi\u1ec7t h\u1ea1i m\u00f4i tr\u01b0\u1eddng \u00e2m th\u1ea7m ph\u00e1 h\u1ee7y t\u1eeb th\u00f4ng t\u1eeb. Nam ch\u00e2m th\u00f4 ti\u1ebfp x\u00fac v\u1edbi \u0111\u1ed9 \u1ea9m, h\u00f3a ch\u1ea5t c\u00f4ng nghi\u1ec7p ho\u1eb7c \u0111\u1ed9 \u1ea9m s\u1ebd suy gi\u1ea3m nhanh ch\u00f3ng. Ch\u00fang t\u00f4i \u00e1p d\u1ee5ng l\u1edbp ph\u1ee7 c\u00f4ng nghi\u1ec7p m\u1ea1nh\u2014c\u1ee5 th\u1ec3 Nickel-Copper-Nickel (Ni-Cu-Ni) v\u00e0 epoxy \u0111\u1ed9 b\u1ec1n cao\u2014\u0111\u1ec3 ho\u00e0n to\u00e0n kh\u00f3a ch\u1eb7t c\u00e1c y\u1ebfu t\u1ed1 \u0103n m\u00f2n. Gi\u1ea3i quy\u1ebft <strong>l\u1edbp ph\u1ee7 nam ch\u00e2m v\u00e0 \u0103n m\u1eeda<\/strong> s\u1edbm s\u1ebd lo\u1ea1i b\u1ecf s\u1edbm vi\u1ec7c bong tr\u00f3c v\u1eadt l\u00fd v\u00e0 m\u1ea5t th\u1ec3 t\u00edch l\u00e0m h\u1ecfng m\u1ea1ch t\u1eeb b\u00ean trong.<\/p>\n<h3>\u0110\u1ed9 c\u1ea1nh c\u1ee7a K\u1ef9 thu\u1eadt NBAEM<\/h3>\n<p>T\u00f4i bi\u1ebft ch\u00ednh x\u00e1c nh\u1eefng g\u00ec c\u1ea7n \u0111\u1ec3 ch\u1ebf t\u1ea1o \u0111\u1ed9ng c\u01a1 ch\u1ecbu \u0111\u01b0\u1ee3c c\u00e1c t\u00ecnh hu\u1ed1ng c\u00f4ng nghi\u1ec7p x\u1ea5u nh\u1ea5t. Ch\u00fang t\u00f4i backing v\u1eadt li\u1ec7u c\u1ee7a m\u00ecnh b\u1eb1ng h\u01a1n 14 n\u0103m kinh nghi\u1ec7m s\u1ea3n xu\u1ea5t th\u1ef1c t\u1ebf v\u00e0 ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng \u0111\u1ea1t chu\u1ea9n ISO\/TS16949 \u1edf m\u1ee9c \u00f4 t\u00f4.<\/p>\n<ul>\n<li><strong>Gi\u1ea3i ph\u00e1p \u0111\u01b0\u1ee3c t\u00f9y bi\u1ebfn:<\/strong> thi\u1ebft k\u1ebf nam ch\u00e2m t\u00f9y ch\u1ec9nh \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng \u0111\u1eb7c bi\u1ec7t cho l\u00f5i ferit EV ph\u1ee9c t\u1ea1p v\u00e0 \u0111\u1ed9ng c\u01a1 servo hi\u1ec7u su\u1ea5t cao.<\/li>\n<li><strong>Ti\u00eau chu\u1ea9n \u00f4 t\u00f4:<\/strong> Ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng nghi\u00eam ng\u1eb7t \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 x\u1eed l\u00fd tr\u01b0\u1eddng t\u1eeb \u0111\u1ed1i ng\u01b0\u1ee3c l\u1edbn v\u00e0 ng\u0103n ch\u1eb7n m\u1ea5t t\u1eeb t\u00ednh kh\u00f4ng th\u1ec3 ph\u1ee5c h\u1ed3i.<\/li>\n<li><strong>\u0110\u1ed9 tin c\u1eady \u0111\u01b0\u1ee3c ch\u1ee9ng minh:<\/strong> Xem x\u00e9t ch\u00fang t\u00f4i <a href=\"https:\/\/nbaem.com\/vi\/hot-pressed-magnet-data-sheet\/\">b\u1ea3ng d\u1eef li\u1ec7u nam ch\u00e2m n\u00e9n n\u00f3ng<\/a> \u0111\u1ec3 xem dung sai nhi\u1ec7t v\u00e0 ng\u01b0\u1ee1ng c\u01b0\u1ee1ng b\u1ee9c ch\u00ednh x\u00e1c m\u00e0 ch\u00fang t\u00f4i duy tr\u00ec \u0111\u1ea1t \u0111\u01b0\u1ee3c.<\/li>\n<\/ul>\n<p>B\u1eb1ng c\u00e1ch t\u00ecm ngu\u1ed3n \u0111\u00fang c\u1ea5p ch\u1ea5t l\u01b0\u1ee3ng v\u00e0 \u00e1p d\u1ee5ng b\u1ea3o v\u1ec7 c\u1ea5u tr\u00fac th\u00edch h\u1ee3p, b\u1ea1n lo\u1ea1i b\u1ecf v\u0129nh vi\u1ec5n c\u00e1c nguy\u00ean nh\u00e2n g\u1ed1c r\u1ec5 c\u1ee7a s\u1ef1 m\u1ea5t t\u1eeb t\u00ednh trong \u0111\u1ed9ng c\u01a1 nam ch\u00e2m v\u0129nh vi\u1ec5n.<\/p>\n<div id=\"references\" class=\"min-w-0 scroll-mt-8 overflow-hidden\">\n<div class=\"text-[16px]\"><\/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 nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3 g\u00e2y m\u1ea5t t\u1eeb t\u00ednh trong \u0111\u1ed9ng c\u01a1 nam ch\u00e2m v\u0129nh c\u1eedu v\u00e0 c\u00e1ch thi\u1ebft k\u1ebf v\u1eadt li\u1ec7u c\u00f9ng l\u00e0m m\u00e1t ng\u0103n m\u1ea5t d\u00f2ng t\u1eeb.<\/p>","protected":false},"author":1,"featured_media":902,"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-3726","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\/2022\/07\/magnetic-rotor.png","_links":{"self":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/3726","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=3726"}],"version-history":[{"count":2,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/3726\/revisions"}],"predecessor-version":[{"id":3728,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/3726\/revisions\/3728"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media\/902"}],"wp:attachment":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media?parent=3726"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/categories?post=3726"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/tags?post=3726"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}