{"id":1356,"date":"2024-10-10T02:37:10","date_gmt":"2024-10-10T02:37:10","guid":{"rendered":"https:\/\/nbaem.com\/?p=1356"},"modified":"2025-09-18T04:11:52","modified_gmt":"2025-09-18T04:11:52","slug":"what-is-magnetic-hysteresis","status":"publish","type":"post","link":"https:\/\/nbaem.com\/vi\/what-is-magnetic-hysteresis\/","title":{"rendered":"Hysteresis t\u1eeb l\u00e0 g\u00ec"},"content":{"rendered":"<h2>\u0110\u1ecbnh ngh\u0129a v\u1ec1 Hysteresis t\u1eeb<\/h2>\n<p>Hysteresis t\u1eeb l\u00e0 m\u1ed9t \u0111\u1eb7c t\u00ednh c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u ferromagnetic, trong \u0111\u00f3 ph\u1ea3n \u1ee9ng t\u1eeb c\u1ee7a v\u1eadt li\u1ec7u ph\u1ee5 thu\u1ed9c kh\u00f4ng ch\u1ec9 v\u00e0o t\u1eeb tr\u01b0\u1eddng hi\u1ec7n t\u1ea1i m\u00e0 c\u00f2n v\u00e0o qu\u00e1 tr\u00ecnh ti\u1ebfp x\u00fac tr\u01b0\u1edbc \u0111\u00f3 v\u1edbi c\u00e1c t\u1eeb tr\u01b0\u1eddng. N\u00f3i m\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n, khi b\u1ea1n \u00e1p d\u1ee5ng m\u1ed9t t\u1eeb tr\u01b0\u1eddng l\u00ean c\u00e1c v\u1eadt li\u1ec7u nh\u01b0 s\u1eaft, ch\u00fang tr\u1edf n\u00ean t\u1eeb h\u00f3a. Tuy nhi\u00ean, khi t\u1eeb tr\u01b0\u1eddng thay \u0111\u1ed5i ho\u1eb7c b\u1ecb lo\u1ea1i b\u1ecf, c\u00e1c v\u1eadt li\u1ec7u n\u00e0y kh\u00f4ng m\u1ea5t ngay l\u1eadp t\u1ee9c kh\u1ea3 n\u0103ng t\u1eeb h\u00f3a c\u1ee7a ch\u00fang. Thay v\u00e0o \u0111\u00f3, ch\u00fang gi\u1eef l\u1ea1i m\u1ed9t ph\u1ea7n k\u00fd \u1ee9c t\u1eeb, g\u00e2y ra s\u1ef1 ch\u1eadm tr\u1ec5 trong ph\u1ea3n \u1ee9ng c\u1ee7a ch\u00fang.<\/p>\n<p>H\u00e0nh vi ch\u1eadm tr\u1ec5 n\u00e0y \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch b\u1edfi v\u1eadt l\u00fd c\u1ee7a c\u00e1c mi\u1ec1n t\u1eeb\u2014nh\u1eefng v\u00f9ng nh\u1ecf b\u00ean trong v\u1eadt li\u1ec7u n\u01a1i c\u00e1c moment t\u1eeb \u0111\u01b0\u1ee3c c\u0103n ch\u1ec9nh theo c\u00f9ng m\u1ed9t h\u01b0\u1edbng. Khi m\u1ed9t t\u1eeb tr\u01b0\u1eddng b\u00ean ngo\u00e0i \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng, c\u00e1c mi\u1ec1n n\u00e0y ph\u00e1t tri\u1ec3n ho\u1eb7c co l\u1ea1i nh\u01b0ng kh\u00f4ng tr\u1edf v\u1ec1 tr\u1ea1ng th\u00e1i ban \u0111\u1ea7u ngay l\u1eadp t\u1ee9c khi t\u1eeb tr\u01b0\u1eddng thay \u0111\u1ed5i. \u0110i\u1ec1u n\u00e0y t\u1ea1o ra m\u1ed9t m\u00f4 h\u00ecnh v\u00f2ng l\u1eb7p g\u1ecdi l\u00e0 v\u00f2ng hysteresis t\u1eeb.<\/p>\n<p>\u0110\u1ed3 th\u1ecb v\u00f2ng hysteresis th\u1ec3 hi\u1ec7n tr\u1ef1c quan c\u00e1ch m\u00e0 \u0111\u1ed9 t\u1eeb c\u1ea3m (\u0111\u1ed9 c\u1ea3m t\u1eeb c\u1ee7a t\u1eeb tr\u01b0\u1eddng) c\u1ee7a m\u1ed9t v\u1eadt li\u1ec7u thay \u0111\u1ed5i theo c\u01b0\u1eddng \u0111\u1ed9 t\u1eeb tr\u01b0\u1eddng \u1ee9ng d\u1ee5ng (c\u01b0\u1eddng \u0111\u1ed9 t\u1eeb tr\u01b0\u1eddng). N\u00f3 ti\u1ebft l\u1ed9 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh nh\u01b0 \u0111\u1ed9 c\u1ee9ng t\u1eeb (kh\u00e1ng l\u1ea1i qu\u00e1 tr\u00ecnh m\u1ea5t t\u1eeb) v\u00e0 kh\u1ea3 n\u0103ng gi\u1eef t\u1eeb (t\u1eeb t\u00ednh c\u00f2n l\u1ea1i), r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 hi\u1ec3u v\u00e0 thi\u1ebft k\u1ebf c\u00e1c thi\u1ebft b\u1ecb t\u1eeb.<\/p>\n<h2>C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Hysteresis t\u1eeb<\/h2>\n<p><img decoding=\"async\" class=\"\" src=\"https:\/\/pub-36eea33d6f1540d281c285671ffb8664.r2.dev\/2025\/09\/18\/Magnetic_Hysteresis_Loop_Explanation_m7Jl41FaV.webp\" alt=\"Gi\u1ea3i th\u00edch v\u1ec1 \u0110\u01b0\u1eddng cong Hysteresis T\u1eeb\" width=\"510\" height=\"449\" \/><\/p>\n<p>Hysteresis t\u1eeb x\u1ea3y ra do c\u00e1ch c\u00e1c v\u1eadt li\u1ec7u t\u1eeb ph\u1ea3n \u1ee9ng khi b\u1ea1n t\u1eeb h\u00f3a r\u1ed3i phi t\u1eeb h\u00f3a ch\u00fang. Khi b\u1ea1n \u00e1p d\u1ee5ng m\u1ed9t t\u1eeb tr\u01b0\u1eddng, c\u00e1c v\u00f9ng nh\u1ecf t\u1eeb c\u1ee7a v\u1eadt li\u1ec7u, g\u1ecdi l\u00e0 mi\u1ec1n, b\u1eaft \u0111\u1ea7u c\u0103n ch\u1ec9nh theo t\u1eeb tr\u01b0\u1eddng \u0111\u00f3. S\u1ef1 c\u0103n ch\u1ec9nh n\u00e0y t\u1ea1o ra t\u1eeb c\u1ea3m. Nh\u01b0ng khi b\u1ea1n lo\u1ea1i b\u1ecf ho\u1eb7c \u0111\u1ea3o ng\u01b0\u1ee3c t\u1eeb tr\u01b0\u1eddng, c\u00e1c mi\u1ec1n n\u00e0y kh\u00f4ng tr\u1edf v\u1ec1 tr\u1ea1ng th\u00e1i ban \u0111\u1ea7u ngay l\u1eadp t\u1ee9c. S\u1ef1 ch\u1eadm tr\u1ec5 n\u00e0y ch\u00ednh l\u00e0 nguy\u00ean nh\u00e2n g\u00e2y ra hi\u1ec7u \u1ee9ng hysteresis.<\/p>\n<p>\u0110\u1ed3 th\u1ecb v\u00f2ng hysteresis t\u1eeb, hay \u0111\u01b0\u1eddng cong B-H, l\u00e0 m\u1ed9t bi\u1ec3u \u0111\u1ed3 th\u1ec3 hi\u1ec7n c\u00e1ch m\u00e0 \u0111\u1ed9 c\u1ea3m t\u1eeb c\u1ee7a v\u1eadt li\u1ec7u (B) thay \u0111\u1ed5i theo c\u01b0\u1eddng \u0111\u1ed9 t\u1eeb tr\u01b0\u1eddng \u1ee9ng d\u1ee5ng (H). C\u00e1c ph\u1ea7n quan tr\u1ecdng c\u1ee7a v\u00f2ng n\u00e0y bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>Kh\u1ea3 n\u0103ng ch\u1ed1ng m\u1ea5t t\u1eeb<\/strong>: T\u1eeb tr\u01b0\u1eddng ng\u01b0\u1ee3c c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u01b0a \u0111\u1ed9 t\u1eeb c\u1ea3m tr\u1edf v\u1ec1 b\u1eb1ng kh\u00f4ng. N\u00f3 cho th\u1ea5y \u0111\u1ed9 'b\u01b0\u1edbng b\u1ec9nh' c\u1ee7a nam ch\u00e2m trong vi\u1ec7c gi\u1eef t\u1eeb t\u00ednh c\u1ee7a m\u00ecnh.<\/li>\n<li><strong>Kh\u1ea3 n\u0103ng gi\u1eef t\u1eeb (ho\u1eb7c t\u1eeb d\u01b0)<\/strong>: L\u01b0\u1ee3ng t\u1eeb t\u00ednh c\u00f2n l\u1ea1i khi t\u1eeb tr\u01b0\u1eddng b\u00ean ngo\u00e0i b\u1ecb lo\u1ea1i b\u1ecf. \u0110i\u1ec1u n\u00e0y cho b\u1ea1n bi\u1ebft v\u1eadt li\u1ec7u gi\u1eef l\u1ea1i bao nhi\u00eau k\u00fd \u1ee9c t\u1eeb.<\/li>\n<li><strong>\u0110\u1ed9 t\u1eeb b\u00e3o h\u00f2a<\/strong>: \u0110\u1ed9 t\u1eeb c\u1ea3m t\u1ed1i \u0111a m\u00e0 m\u1ed9t v\u1eadt li\u1ec7u c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c khi t\u1ea5t c\u1ea3 c\u00e1c mi\u1ec1n \u0111\u1ec1u \u0111\u01b0\u1ee3c c\u0103n ch\u1ec9nh ho\u00e0n to\u00e0n.<\/li>\n<\/ul>\n<h2>C\u00e1c lo\u1ea1i v\u1eadt li\u1ec7u t\u1eeb v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m hysteresis c\u1ee7a ch\u00fang<\/h2>\n<p>V\u1eadt li\u1ec7u t\u1eeb ch\u1ee7 y\u1ebfu chia th\u00e0nh hai lo\u1ea1i:\u00a0<strong>v\u1eadt li\u1ec7u t\u1eeb m\u1ec1m<\/strong>\u00a0v\u00e0\u00a0<strong>v\u1eadt li\u1ec7u t\u1eeb c\u1ee9ng<\/strong>. M\u1ed7i lo\u1ea1i th\u1ec3 hi\u1ec7n h\u00e0nh vi hysteresis kh\u00e1c nhau, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a ch\u00fang.<\/p>\n<h3>V\u1eadt li\u1ec7u t\u1eeb m\u1ec1m<\/h3>\n<ul>\n<li>C\u00f3\u00a0<strong>v\u00f2ng hysteresis h\u1eb9p<\/strong><\/li>\n<li>\u0110\u1ed9 c\u1ee9ng t\u1eeb th\u1ea5p (d\u1ec5 t\u1eeb h\u00f3a v\u00e0 phi t\u1eeb h\u00f3a)<\/li>\n<li>Kh\u1ea3 n\u0103ng gi\u1eef t\u1eeb th\u1ea5p (kh\u00f4ng gi\u1eef t\u1eeb t\u1ed1t)<\/li>\n<li>L\u00fd t\u01b0\u1edfng cho c\u00e1c \u1ee9ng d\u1ee5ng c\u1ea7n ph\u1ea3n \u1ee9ng t\u1eeb nhanh v\u00e0 t\u1ed5n th\u1ea5t n\u0103ng l\u01b0\u1ee3ng t\u1ed1i thi\u1ec3u<\/li>\n<\/ul>\n<p><strong>V\u00ed d\u1ee5 ph\u1ed5 bi\u1ebfn:<\/strong><\/p>\n<ul>\n<li>Th\u00e9p silic<\/li>\n<li>Ferrite<\/li>\n<\/ul>\n<h3>V\u1eadt li\u1ec7u t\u1eeb c\u1ee9ng<\/h3>\n<ul>\n<li>Hi\u1ec3n th\u1ecb\u00a0<strong>chu k\u1ef3 n\u1ed9i \u1ee9ng r\u1ed9ng<\/strong><\/li>\n<li>Kh\u00e1ng t\u1eeb cao (kh\u00e1ng m\u1ea5t t\u1eeb)<\/li>\n<li>Kh\u1ea3 n\u0103ng gi\u1eef t\u1eeb l\u00e2u (gi\u1eef t\u1eeb tr\u01b0\u1eddng trong th\u1eddi gian d\u00e0i)<\/li>\n<li>S\u1eed d\u1ee5ng khi c\u1ea7n t\u1eeb tr\u01b0\u1eddng v\u0129nh vi\u1ec5n<\/li>\n<\/ul>\n<p><strong>V\u00ed d\u1ee5 ph\u1ed5 bi\u1ebfn:<\/strong><\/p>\n<ul>\n<li>Nam ch\u00e2m \u0111\u1ea5t hi\u1ebfm (nh\u01b0 neodymium v\u00e0 samarium-cobalt)<\/li>\n<\/ul>\n<div class=\"table-responsive\">\n<table class=\"table\">\n<thead>\n<tr>\n<th>Thu\u1ed9c t\u00ednh<\/th>\n<th>V\u1eadt li\u1ec7u t\u1eeb m\u1ec1m<\/th>\n<th>V\u1eadt li\u1ec7u t\u1eeb c\u1ee9ng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Kh\u1ea3 n\u0103ng ch\u1ed1ng m\u1ea5t t\u1eeb<\/td>\n<td>Th\u1ea5p<\/td>\n<td>Cao<\/td>\n<\/tr>\n<tr>\n<td>Kh\u1ea3 n\u0103ng gi\u1eef t\u1eeb<\/td>\n<td>Th\u1ea5p<\/td>\n<td>Cao<\/td>\n<\/tr>\n<tr>\n<td>Chu k\u1ef3 n\u1ed9i \u1ee9ng<\/td>\n<td>H\u1eb9p<\/td>\n<td>R\u1ed9ng<\/td>\n<\/tr>\n<tr>\n<td>M\u1ea5t n\u0103ng l\u01b0\u1ee3ng (M\u1ea5t n\u1ed9i \u1ee9ng)<\/td>\n<td>Th\u1ea5p<\/td>\n<td>Cao h\u01a1n<\/td>\n<\/tr>\n<tr>\n<td>\u1ee8ng d\u1ee5ng<\/td>\n<td>Bi\u1ebfn \u00e1p, cu\u1ed9n c\u1ea3m<\/td>\n<td>Nam ch\u00e2m v\u0129nh c\u1eedu, \u0111\u1ed9ng c\u01a1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Hi\u1ec3u r\u00f5 nh\u1eefng kh\u00e1c bi\u1ec7t n\u00e0y gi\u00fap l\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u ph\u00f9 h\u1ee3p d\u1ef1a tr\u00ean hi\u1ec7u qu\u1ea3, nhu c\u1ea7u l\u01b0u tr\u1eef t\u1eeb v\u00e0 ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng\u2014\u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng trong th\u1ecb tr\u01b0\u1eddng Vi\u1ec7t Nam cho c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p nh\u01b0 \u0111i\u1ec7n l\u1ef1c, \u0111i\u1ec7n t\u1eed v\u00e0 \u00f4 t\u00f4.<\/p>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam v\u1ec1 c\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a v\u1eadt li\u1ec7u t\u1eeb, h\u00e3y xem\u00a0<span style=\"color: #ff6600;\"><strong><a style=\"color: #ff6600;\" href=\"https:\/\/nbaem.com\/vi\/soft-magnetic-materials-vs-hard-magnetic-materials\/\" target=\"_blank\" rel=\"noopener\">v\u1eadt li\u1ec7u t\u1eeb m\u1ec1m so v\u1edbi v\u1eadt li\u1ec7u t\u1eeb c\u1ee9ng<\/a><\/strong><\/span>\u00a0h\u01b0\u1edbng d\u1eabn.<\/p>\n<p>&nbsp;<\/p>\n<h2>T\u1ea7m quan tr\u1ecdng c\u1ee7a n\u1ed9i \u1ee9ng t\u1eeb trong v\u1eadt li\u1ec7u t\u1eeb<\/h2>\n<p>N\u1ed9i \u1ee9ng t\u1eeb \u0111\u00f3ng vai tr\u00f2 l\u1edbn trong hi\u1ec7u su\u1ea5t c\u1ee7a v\u1eadt li\u1ec7u t\u1eeb, \u0111\u1eb7c bi\u1ec7t khi ch\u00fang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c thi\u1ebft b\u1ecb h\u00e0ng ng\u00e0y. M\u1ed9t v\u1ea5n \u0111\u1ec1 ch\u00ednh l\u00e0\u00a0<strong>m\u1ea5t n\u0103ng l\u01b0\u1ee3ng do n\u1ed9i \u1ee9ng<\/strong>, c\u00f2n g\u1ecdi l\u00e0 m\u1ea5t n\u1ed9i \u1ee9ng. M\u1ea5t n\u00e0y x\u1ea3y ra v\u00ec khi m\u1ed9t v\u1eadt li\u1ec7u t\u1eeb nh\u01b0 l\u00f5i bi\u1ebfn \u00e1p ho\u1eb7c d\u00e2y qu\u1ea5n \u0111\u1ed9ng c\u01a1 tr\u1ea3i qua qu\u00e1 tr\u00ecnh t\u1eeb h\u00f3a v\u00e0 phi t\u1eeb h\u00f3a (\u1ee9ng d\u1ee5ng xoay chi\u1ec1u), n\u00f3 ti\u00eau t\u1ed1n n\u0103ng l\u01b0\u1ee3ng d\u01b0\u1edbi d\u1ea1ng nhi\u1ec7t. \u0110i\u1ec1u n\u00e0y l\u00e0m gi\u1ea3m hi\u1ec7u qu\u1ea3 v\u00e0 c\u00f3 th\u1ec3 l\u00e0m t\u0103ng chi ph\u00ed v\u1eadn h\u00e0nh.<\/p>\n<p>Trong c\u00e1c bi\u1ebfn \u00e1p, cu\u1ed9n c\u1ea3m v\u00e0 \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n, m\u1ea5t n\u1ed9i \u1ee9ng gi\u1edbi h\u1ea1n kh\u1ea3 n\u0103ng chuy\u1ec3n \u0111\u1ed5i v\u00e0 truy\u1ec1n t\u1ea3i n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n c\u1ee7a thi\u1ebft b\u1ecb. Chu k\u1ef3 n\u1ed9i \u1ee9ng r\u00f5 r\u00e0ng h\u01a1n, n\u0103ng l\u01b0\u1ee3ng b\u1ecb m\u1ea5t nhi\u1ec1u h\u01a1n. \u0110\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao vi\u1ec7c ch\u1ecdn v\u1eadt li\u1ec7u c\u00f3 \u0111\u1ed9 c\u01b0\u1ee1ng b\u1ee9c th\u1ea5p v\u00e0 chu k\u1ef3 n\u1ed9i \u1ee9ng h\u1eb9p l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 n\u00e2ng cao hi\u1ec7u qu\u1ea3 c\u1ee7a thi\u1ebft b\u1ecb.<\/p>\n<p>Ngo\u00e0i c\u00e1c \u1ee9ng d\u1ee5ng v\u1ec1 \u0111i\u1ec7n n\u0103ng, n\u1ed9i \u1ee9ng t\u1eeb c\u00f2n quan tr\u1ecdng \u0111\u1ed1i v\u1edbi\u00a0<strong>thi\u1ebft b\u1ecb l\u01b0u tr\u1eef t\u1eeb v\u00e0 c\u1ea3m bi\u1ebfn<\/strong>. Kh\u1ea3 n\u0103ng gi\u1eef t\u1eeb\u2014kh\u1ea3 n\u0103ng c\u1ee7a v\u1eadt li\u1ec7u t\u1eeb \u0111\u1ec3 ghi nh\u1edb t\u1eeb tr\u01b0\u1eddng c\u1ee7a n\u00f3\u2014gi\u00fap l\u01b0u tr\u1eef d\u1eef li\u1ec7u trong \u1ed5 c\u1ee9ng ho\u1eb7c gi\u1eef c\u1ea3m bi\u1ebfn \u1ed5n \u0111\u1ecbnh v\u00e0 \u0111\u00e1ng tin c\u1eady. N\u1ebfu kh\u00f4ng c\u00f3 \u0111\u1eb7c t\u00ednh n\u1ed9i \u1ee9ng ki\u1ec3m so\u00e1t t\u1ed1t, c\u00e1c thi\u1ebft b\u1ecb n\u00e0y s\u1ebd kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng d\u1ef1 \u0111o\u00e1n ho\u1eb7c gi\u1eef th\u00f4ng tin t\u1ed1t.<\/p>\n<p>Hi\u1ec3u bi\u1ebft v\u00e0 qu\u1ea3n l\u00fd hi\u1ec7n t\u01b0\u1ee3ng m\u1ea5t t\u1eeb c\u1ee7a t\u1eeb tr\u01b0\u1eddng l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 thi\u1ebft k\u1ebf c\u00e1c th\u00e0nh ph\u1ea7n t\u1eeb tr\u01b0\u1eddng t\u1ed1t h\u01a1n, ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng h\u01a1n v\u00e0 c\u00f4ng ngh\u1ec7 d\u1eef li\u1ec7u \u0111\u00e1ng tin c\u1eady h\u01a1n.<\/p>\n<h2>\u1ee8ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a hi\u1ec7n t\u01b0\u1ee3ng m\u1ea5t t\u1eeb c\u1ee7a t\u1eeb tr\u01b0\u1eddng<\/h2>\n<p>Hi\u1ec7n t\u01b0\u1ee3ng m\u1ea5t t\u1eeb c\u1ee7a t\u1eeb tr\u01b0\u1eddng \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong nhi\u1ec1u c\u00f4ng ngh\u1ec7 th\u1ef1c t\u1ebf, \u0111\u1eb7c bi\u1ec7t trong k\u1ef9 thu\u1eadt \u0111i\u1ec7n. Trong bi\u1ebfn \u00e1p, \u0111\u1ed9ng c\u01a1 v\u00e0 m\u00e1y ph\u00e1t \u0111i\u1ec7n, ki\u1ec3m so\u00e1t m\u1ea5t t\u1eeb gi\u00fap c\u1ea3i thi\u1ec7n hi\u1ec7u qu\u1ea3 b\u1eb1ng c\u00e1ch gi\u1ea3m thi\u1ec3u t\u1ed5n th\u1ea5t n\u0103ng l\u01b0\u1ee3ng trong c\u00e1c chu k\u1ef3 t\u1eeb h\u00f3a. \u0110i\u1ec1u n\u00e0y \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn hi\u1ec7u su\u1ea5t v\u00e0 tu\u1ed5i th\u1ecd c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb n\u00e0y.<\/p>\n<p>Trong l\u01b0u tr\u1eef d\u1eef li\u1ec7u, hi\u1ec7n t\u01b0\u1ee3ng m\u1ea5t t\u1eeb c\u1ee7a t\u1eeb tr\u01b0\u1eddng l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a ghi d\u1eef li\u1ec7u t\u1eeb. C\u00e1c thi\u1ebft b\u1ecb nh\u01b0 \u1ed5 c\u1ee9ng d\u1ef1a tr\u00ean c\u00e1c v\u1eadt li\u1ec7u gi\u1eef tr\u1ea1ng th\u00e1i t\u1eeb (kh\u1ea3 n\u0103ng gi\u1eef t\u1eeb) \u0111\u1ec3 l\u01b0u tr\u1eef d\u1eef li\u1ec7u m\u1ed9t c\u00e1ch \u0111\u00e1ng tin c\u1eady theo th\u1eddi gian. C\u00e1c \u0111\u1eb7c t\u00ednh m\u1ea5t t\u1eeb \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u c\u00f2n nguy\u00ean v\u1eb9n cho \u0111\u1ebfn khi thay \u0111\u1ed5i c\u00f3 ch\u1ee7 \u00fd.<\/p>\n<p>C\u1ea3m bi\u1ebfn t\u1eeb v\u00e0 c\u00f4ng t\u1eafc t\u1eeb c\u0169ng ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ea5t t\u1eeb. C\u00e1c thi\u1ebft b\u1ecb n\u00e0y s\u1eed d\u1ee5ng hi\u1ec7u \u1ee9ng b\u1ed9 nh\u1edb t\u1eeb \u0111\u1ec3 ph\u00e1t hi\u1ec7n s\u1ef1 thay \u0111\u1ed5i trong tr\u01b0\u1eddng t\u1eeb ho\u1eb7c \u0111i\u1ec1u khi\u1ec3n m\u1ea1ch d\u1ef1a tr\u00ean tr\u1ea1ng th\u00e1i t\u1eeb. \u0110i\u1ec1u n\u00e0y khi\u1ebfn ch\u00fang tr\u1edf n\u00ean thi\u1ebft y\u1ebfu trong t\u1ef1 \u0111\u1ed9ng h\u00f3a v\u00e0 h\u1ec7 th\u1ed1ng an to\u00e0n.<\/p>\n<p>Cu\u1ed1i c\u00f9ng, hi\u1ec7n t\u01b0\u1ee3ng m\u1ea5t t\u1eeb c\u1ee7a t\u1eeb tr\u01b0\u1eddng gi\u00fap trong vi\u1ec7c che ch\u1eafn t\u1eeb v\u00e0 l\u1ecdc nhi\u1ec5u. C\u00e1c v\u1eadt li\u1ec7u c\u00f3 \u0111\u1eb7c t\u00ednh m\u1ea5t t\u1eeb c\u1ee5 th\u1ec3 c\u00f3 th\u1ec3 ch\u1eb7n ho\u1eb7c gi\u1ea3m thi\u1ec3u nhi\u1ec5u t\u1eeb kh\u00f4ng mong mu\u1ed1n, b\u1ea3o v\u1ec7 c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed nh\u1ea1y c\u1ea3m trong c\u00e1c thi\u1ebft b\u1ecb y t\u1ebf, h\u1ec7 th\u1ed1ng truy\u1ec1n th\u00f4ng v\u00e0 thi\u1ebft b\u1ecb c\u00f4ng nghi\u1ec7p.<\/p>\n<h2>\u0110o l\u01b0\u1eddng v\u00e0 ph\u00e2n t\u00edch hi\u1ec7n t\u01b0\u1ee3ng m\u1ea5t t\u1eeb c\u1ee7a t\u1eeb tr\u01b0\u1eddng<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/pub-36eea33d6f1540d281c285671ffb8664.r2.dev\/2025\/09\/18\/Magnetic_Hysteresis_Measurement_Techniques_AVzZz58.webp\" alt=\"K\u1ef9 thu\u1eadt \u0111o l\u01b0\u1eddng Hysteresis T\u1eeb\" \/><\/p>\n<p>\u0110\u1ec3 hi\u1ec3u v\u00e0 t\u1ed1i \u01b0u h\u00f3a hi\u1ec7n t\u01b0\u1ee3ng m\u1ea5t t\u1eeb c\u1ee7a t\u1eeb tr\u01b0\u1eddng, ch\u00fang ta d\u1ef1a v\u00e0o c\u00e1c thi\u1ebft b\u1ecb ch\u00ednh x\u00e1c \u0111o v\u00f2ng t\u1eeb c\u1ee7a t\u1eeb tr\u01b0\u1eddng, c\u00f2n g\u1ecdi l\u00e0 \u0111\u01b0\u1eddng cong B-H. Hai c\u00f4ng c\u1ee5 ph\u1ed5 bi\u1ebfn nh\u1ea5t l\u00e0:<\/p>\n<ul>\n<li><strong>M\u00e1y \u0111o t\u1eeb m\u1eabu dao \u0111\u1ed9ng (VSM):<\/strong>\u00a0\u0110o \u0111\u1eb7c t\u00ednh t\u1eeb c\u1ee7a v\u1eadt li\u1ec7u b\u1eb1ng c\u00e1ch rung m\u1eabu trong m\u1ed9t tr\u01b0\u1eddng t\u1eeb, ph\u00e1t hi\u1ec7n s\u1ef1 thay \u0111\u1ed5i trong qu\u00e1 tr\u00ecnh t\u1eeb h\u00f3a.<\/li>\n<li><strong>M\u00e1y theo d\u00f5i v\u00f2ng B-H:<\/strong>\u00a0Truy v\u1ebft tr\u1ef1c ti\u1ebfp v\u00f2ng m\u1ea5t t\u1eeb b\u1eb1ng c\u00e1ch \u0111o c\u01b0\u1eddng \u0111\u1ed9 tr\u01b0\u1eddng t\u1eeb (H) so v\u1edbi m\u1eadt \u0111\u1ed9 d\u00f2ng t\u1eeb (B).<\/li>\n<\/ul>\n<p>C\u00e1c c\u00f4ng c\u1ee5 n\u00e0y gi\u00fap thu th\u1eadp c\u00e1c tham s\u1ed1 ch\u00ednh t\u1eeb v\u00f2ng m\u1ea5t t\u1eeb:<\/p>\n<div class=\"table-responsive\">\n<table class=\"table\">\n<thead>\n<tr>\n<th>Tham s\u1ed1<\/th>\n<th>\u00dd ngh\u0129a c\u1ee7a n\u00f3<\/th>\n<th>T\u1ea1i sao \u0111i\u1ec1u n\u00e0y quan tr\u1ecdng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Kh\u1ea3 n\u0103ng ch\u1ed1ng m\u1ea5t t\u1eeb<\/td>\n<td>L\u1ef1c c\u1ea7n thi\u1ebft \u0111\u1ec3 gi\u1ea3m t\u1eeb h\u00f3a v\u1ec1 kh\u00f4ng<\/td>\n<td>Cho th\u1ea5y kh\u1ea3 n\u0103ng ch\u1ed1ng m\u1ea5t t\u1eeb c\u1ee7a v\u1eadt li\u1ec7u<\/td>\n<\/tr>\n<tr>\n<td>Kh\u1ea3 n\u0103ng gi\u1eef t\u1eeb<\/td>\n<td>T\u1eeb t\u00ednh c\u00f2n l\u1ea1i sau khi lo\u1ea1i b\u1ecf tr\u01b0\u1eddng<\/td>\n<td>Ch\u1ec9 ra m\u1ee9c \u0111\u1ed9 v\u1eadt li\u1ec7u ghi nh\u1edb tr\u1ea1ng th\u00e1i t\u1eeb<\/td>\n<\/tr>\n<tr>\n<td>T\u1eeb t\u00ednh b\u00e3o h\u00f2a<\/td>\n<td>M\u1ee9c \u0111\u1ed9 t\u1eeb t\u00ednh t\u1ed1i \u0111a m\u00e0 v\u1eadt li\u1ec7u c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c<\/td>\n<td>X\u00e1c \u0111\u1ecbnh kh\u1ea3 n\u0103ng t\u1eeb c\u1ee7a v\u1eadt li\u1ec7u<\/td>\n<\/tr>\n<tr>\n<td>M\u1ea5t m\u1ebb do qu\u00e1n t\u00ednh t\u1eeb<\/td>\n<td>Di\u1ec7n t\u00edch b\u00ean trong v\u00f2ng th\u1ec3 hi\u1ec7n n\u0103ng l\u01b0\u1ee3ng b\u1ecb m\u1ea5t<\/td>\n<td>R\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 hi\u1ec7u qu\u1ea3, \u0111\u1eb7c bi\u1ec7t trong s\u1eed d\u1ee5ng m\u00e1y \u0111i\u1ec1u h\u00f2a kh\u00f4ng kh\u00ed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>C\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t s\u1eed d\u1ee5ng c\u00e1c ph\u00e9p \u0111o n\u00e0y trong ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o v\u1eadt li\u1ec7u \u0111\u00e1p \u1ee9ng c\u00e1c ti\u00eau chu\u1ea9n v\u1ec1 hi\u1ec7u su\u1ea5t v\u00e0 hi\u1ec7u qu\u1ea3. S\u1ef1 nh\u1ea5t qu\u00e1n trong t\u00ednh ch\u1ea5t t\u1eeb c\u1ee7a ch\u00fang c\u00f3 ngh\u0129a l\u00e0 \u0111\u1ed9 tin c\u1eady t\u1ed1t h\u01a1n trong c\u00e1c bi\u1ebfn \u00e1p, \u0111\u1ed9ng c\u01a1 v\u00e0 thi\u1ebft b\u1ecb l\u01b0u tr\u1eef \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng tr\u00ean th\u1ecb tr\u01b0\u1eddng Vi\u1ec7t Nam.<\/p>\n<h2>Gi\u1ea3m thi\u1ec3u v\u00e0 ki\u1ec3m so\u00e1t t\u1ed5n th\u1ea5t Hysteresis<\/h2>\n<p>Gi\u1ea3m t\u1ed5n th\u1ea5t hysteresis b\u1eaft \u0111\u1ea7u b\u1eb1ng vi\u1ec7c ch\u1ecdn lo\u1ea1i v\u1eadt li\u1ec7u t\u1eeb ph\u00f9 h\u1ee3p.\u00a0<strong>V\u1eadt li\u1ec7u t\u1eeb m\u1ec1m<\/strong>\u00a0nh\u01b0 th\u00e9p silicon ho\u1eb7c ferrite c\u00f3 \u0111\u1ed9 c\u01b0\u1ee1ng t\u1eeb th\u1ea5p, c\u00f3 ngh\u0129a l\u00e0 ch\u00fang d\u1ec5 magnetize v\u00e0 demagnetize v\u1edbi t\u1ed5n th\u1ea5t n\u0103ng l\u01b0\u1ee3ng t\u1ed1i thi\u1ec3u. Nh\u1eefng v\u1eadt li\u1ec7u n\u00e0y l\u00fd t\u01b0\u1edfng cho bi\u1ebfn \u00e1p v\u00e0 cu\u1ed9n c\u1ea3m n\u01a1i x\u1ea3y ra c\u00e1c thay \u0111\u1ed5i t\u1eeb nhanh ch\u00f3ng. Ng\u01b0\u1ee3c l\u1ea1i,\u00a0<strong>v\u1eadt li\u1ec7u t\u1eeb c\u1ee9ng<\/strong>\u00a0v\u1edbi \u0111\u1ed9 c\u01b0\u1ee1ng t\u1eeb cao r\u1ea5t ph\u00f9 h\u1ee3p khi b\u1ea1n mu\u1ed1n m\u1ed9t nam ch\u00e2m v\u0129nh c\u1eedu nh\u01b0ng th\u01b0\u1eddng c\u00f3 t\u1ed5n th\u1ea5t hysteresis cao h\u01a1n.<\/p>\n<p>\u0110\u1ec3 ki\u1ec3m so\u00e1t th\u00eam t\u1ed5n th\u1ea5t hysteresis, c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t th\u01b0\u1eddng s\u1eed d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00fd nh\u01b0:<\/p>\n<ul>\n<li><strong>Nung<\/strong>: Nung v\u00e0 l\u00e0m ngu\u1ed9i ch\u1eadm c\u00e1c v\u1eadt li\u1ec7u gi\u00fap gi\u1ea3m thi\u1ec3u c\u0103ng th\u1eb3ng n\u1ed9i b\u1ed9, c\u1ea3i thi\u1ec7n t\u00ednh ch\u1ea5t t\u1eeb v\u00e0 gi\u1ea3m t\u1ed5n th\u1ea5t n\u0103ng l\u01b0\u1ee3ng.<\/li>\n<li><strong>H\u1ee3p kim h\u00f3a<\/strong>: Th\u00eam c\u00e1c nguy\u00ean t\u1ed1 nh\u01b0 nh\u00f4m, nickel ho\u1eb7c cobalt gi\u00fap \u0111i\u1ec1u ch\u1ec9nh h\u00e0nh vi t\u1eeb v\u00e0 gi\u1ea3m hysteresis.<\/li>\n<\/ul>\n<p>Cu\u1ed1i c\u00f9ng, thi\u1ebft k\u1ebf th\u00f4ng minh \u0111\u00f3ng vai tr\u00f2 l\u1edbn. C\u00e1c k\u1ef9 s\u01b0 t\u1ed1i \u01b0u h\u00f3a h\u00ecnh d\u1ea1ng thi\u1ebft b\u1ecb t\u1eeb, k\u00edch th\u01b0\u1edbc l\u00f5i v\u00e0 c\u1ea5u h\u00ecnh qu\u1ea5n \u0111\u1ec3 gi\u1ea3m thi\u1ec3u tr\u1edf kh\u00e1ng t\u1eeb kh\u00f4ng c\u1ea7n thi\u1ebft v\u00e0 l\u00e3ng ph\u00ed n\u0103ng l\u01b0\u1ee3ng. S\u1eed d\u1ee5ng l\u00f5i l\u00e1 ho\u1eb7c l\u00f5i b\u1ed9t c\u0169ng gi\u00fap h\u1ea1n ch\u1ebf d\u00f2ng xo\u00e1y, b\u1ed5 sung cho c\u00e1c n\u1ed7 l\u1ef1c gi\u1ea3m t\u1ed5n th\u1ea5t hysteresis.<\/p>\n<p>T\u1ea5t c\u1ea3 c\u00e1c chi\u1ebfn l\u01b0\u1ee3c n\u00e0y k\u1ebft h\u1ee3p l\u00e0m cho c\u00e1c th\u00e0nh ph\u1ea7n t\u1eeb tr\u1edf n\u00ean hi\u1ec7u qu\u1ea3 v\u00e0 \u0111\u00e1ng tin c\u1eady h\u01a1n, mang l\u1ea1i l\u1ee3i \u00edch cho m\u1ecdi th\u1ee9 t\u1eeb bi\u1ebfn \u00e1p \u0111\u1ebfn \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng tr\u00ean th\u1ecb tr\u01b0\u1eddng Vi\u1ec7t Nam.<\/p>","protected":false},"excerpt":{"rendered":"<p>\u0110\u1ecbnh ngh\u0129a c\u1ee7a Hysteresis t\u1eeb t\u00ednh Hysteresis t\u1eeb t\u00ednh l\u00e0 m\u1ed9t \u0111\u1eb7c t\u00ednh c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u ferromagnetic, trong \u0111\u00f3 ph\u1ea3n \u1ee9ng t\u1eeb c\u1ee7a v\u1eadt li\u1ec7u ph\u1ee5 thu\u1ed9c kh\u00f4ng ch\u1ec9 v\u00e0o t\u1eeb tr\u01b0\u1eddng hi\u1ec7n t\u1ea1i m\u00e0 c\u00f2n v\u00e0o qu\u00e1 tr\u00ecnh ti\u1ebfp x\u00fac tr\u01b0\u1edbc \u0111\u00f3 v\u1edbi c\u00e1c t\u1eeb tr\u01b0\u1eddng. N\u00f3i m\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n, khi b\u1ea1n \u00e1p d\u1ee5ng m\u1ed9t t\u1eeb tr\u01b0\u1eddng l\u00ean c\u00e1c v\u1eadt li\u1ec7u nh\u01b0 s\u1eaft, ch\u00fang tr\u1edf n\u00ean t\u1eeb h\u00f3a. [...]<\/p>","protected":false},"author":1,"featured_media":1354,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_mi_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1356","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"jetpack_featured_media_url":"https:\/\/nbaem.com\/wp-content\/uploads\/2024\/10\/magnetic-hysteresis.jpg","_links":{"self":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1356","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=1356"}],"version-history":[{"count":4,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1356\/revisions"}],"predecessor-version":[{"id":2890,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1356\/revisions\/2890"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media\/1354"}],"wp:attachment":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media?parent=1356"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/categories?post=1356"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/tags?post=1356"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}