{"id":1719,"date":"2025-07-04T06:04:59","date_gmt":"2025-07-04T06:04:59","guid":{"rendered":"https:\/\/nbaem.com\/?p=1719"},"modified":"2025-09-17T07:51:52","modified_gmt":"2025-09-17T07:51:52","slug":"what-is-permanent-magnetism","status":"publish","type":"post","link":"https:\/\/nbaem.com\/vi\/what-is-permanent-magnetism\/","title":{"rendered":"L\u00e0 g\u00ec t\u1eeb t\u00ednh v\u0129nh c\u1eedu"},"content":{"rendered":"<h1>L\u00e0 g\u00ec t\u1eeb t\u00ednh v\u0129nh c\u1eedu<\/h1>\n<p>Nam ch\u00e2m c\u00f3 v\u1ebb \u0111\u01a1n gi\u1ea3n, nh\u01b0ng s\u1ee9c m\u1ea1nh c\u1ee7a ch\u00fang n\u1eb1m \u1edf c\u00e1c l\u1ef1c v\u00f4 h\u00ecnh \u0111\u1ecbnh h\u00ecnh c\u00f4ng ngh\u1ec7 hi\u1ec7n \u0111\u1ea1i. T\u1eeb \u0111i\u1ec7n tho\u1ea1i c\u1ee7a b\u1ea1n \u0111\u1ebfn \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n, t\u1eeb tr\u01b0\u1eddng l\u00e0m m\u1ecdi th\u1ee9 tr\u1edf n\u00ean kh\u1ea3 thi.<\/p>\n<p><strong>H\u1ec7 t\u1eeb tr\u01b0\u1eddng v\u0129nh c\u1eedu \u0111\u1ec1 c\u1eadp \u0111\u1ebfn tr\u01b0\u1eddng t\u1eeb \u1ed5n \u0111\u1ecbnh do m\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u t\u1ea1o ra m\u00e0 kh\u00f4ng c\u1ea7n ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng b\u00ean ngo\u00e0i. N\u00f3 kh\u00e1c v\u1edbi t\u1eeb tr\u01b0\u1eddng c\u1ea3m \u1ee9ng, ch\u1ec9 x\u1ea3y ra khi c\u00f3 tr\u01b0\u1eddng b\u00ean ngo\u00e0i hi\u1ec7n di\u1ec7n.<\/strong><\/p>\n<figure>\n<p><div id=\"attachment_1721\" style=\"width: 477px\" class=\"wp-caption alignnone\"><img decoding=\"async\" aria-describedby=\"caption-attachment-1721\" class=\"wp-image-1721\" src=\"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/07\/magnet-field-lines.jpg\" alt=\"\u0111\u01b0\u1eddng t\u1eeb tr\u01b0\u1eddng\" width=\"467\" height=\"444\" srcset=\"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/07\/magnet-field-lines-200x190.jpg 200w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/07\/magnet-field-lines-300x285.jpg 300w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/07\/magnet-field-lines-400x381.jpg 400w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/07\/magnet-field-lines-600x571.jpg 600w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/07\/magnet-field-lines.jpg 639w\" sizes=\"(max-width: 467px) 100vw, 467px\" \/><p id=\"caption-attachment-1721\" class=\"wp-caption-text\">\u0111\u01b0\u1eddng s\u1ee9c t\u1eeb (\u1ea3nh t\u1eeb sciencefacts)<\/p><\/div><\/figure>\n<p>H\u00e3y kh\u00e1m ph\u00e1 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa t\u1eeb tr\u01b0\u1eddng v\u0129nh c\u1eedu v\u00e0 c\u1ea3m \u1ee9ng, c\u00e1ch t\u1ea1o ra nam ch\u00e2m v\u0129nh c\u1eedu, \u0111\u1eb7c t\u00ednh c\u1ee7a ch\u00fang v\u00e0 c\u00e1ch ch\u00fang \u0111\u1ecbnh h\u00ecnh c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p tr\u00ean to\u00e0n th\u1ebf gi\u1edbi.<\/p>\n<h2>H\u1ec7 t\u1eeb tr\u01b0\u1eddng v\u0129nh c\u1eedu v\u00e0 h\u1ec7 t\u1eeb c\u1ea3m \u1ee9ng l\u00e0 g\u00ec?<\/h2>\n<p>M\u1ed9t s\u1ed1 nam ch\u00e2m t\u1ed3n t\u1ea1i m\u00e3i m\u00e3i, trong khi nh\u1eefng nam ch\u00e2m kh\u00e1c c\u1ea7n s\u1ef1 tr\u1ee3 gi\u00fap \u0111\u1ec3 ho\u1ea1t \u0111\u1ed9ng. Hi\u1ec3u r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y ti\u1ebft l\u1ed9 nhi\u1ec1u \u0111i\u1ec1u v\u1ec1 c\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a t\u1eeb tr\u01b0\u1eddng trong th\u1ebf gi\u1edbi th\u1ef1c.<\/p>\n<p><strong>H\u1ec7 t\u1eeb tr\u01b0\u1eddng v\u0129nh c\u1eedu \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng s\u1eb5n v\u00e0 \u1ed5n \u0111\u1ecbnh, trong khi h\u1ec7 t\u1eeb c\u1ea3m \u1ee9ng l\u00e0 t\u1ea1m th\u1eddi v\u00e0 ph\u1ee5 thu\u1ed9c v\u00e0o \u1ea3nh h\u01b0\u1edfng t\u1eeb tr\u01b0\u1eddng b\u00ean ngo\u00e0i.<\/strong><\/p>\n<p>&nbsp;<\/p>\n<h3>S\u1ef1 kh\u00e1c bi\u1ec7t ch\u00ednh gi\u1eefa h\u1ec7 t\u1eeb tr\u01b0\u1eddng v\u0129nh c\u1eedu v\u00e0 c\u1ea3m \u1ee9ng<\/h3>\n<table>\n<thead>\n<tr>\n<th>\u0110\u1eb7c \u0111i\u1ec3m<\/th>\n<th>H\u1ec7 t\u1eeb tr\u01b0\u1eddng v\u0129nh c\u1eedu<\/th>\n<th>H\u1ec7 t\u1eeb c\u1ea3m \u1ee9ng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Ngu\u1ed3n t\u1eeb tr\u01b0\u1eddng<\/td>\n<td>Mi\u1ec1n t\u1eeb n\u1ed9i t\u1ea1i<\/td>\n<td>Tr\u01b0\u1eddng t\u1eeb b\u00ean ngo\u00e0i<\/td>\n<\/tr>\n<tr>\n<td>Th\u1eddi gian t\u1ed3n t\u1ea1i<\/td>\n<td>K\u00e9o d\u00e0i, th\u01b0\u1eddng l\u00e0 v\u0129nh c\u1eedu<\/td>\n<td>T\u1ea1m th\u1eddi, bi\u1ebfn m\u1ea5t khi tr\u01b0\u1eddng b\u1ecb lo\u1ea1i b\u1ecf<\/td>\n<\/tr>\n<tr>\n<td>V\u00ed d\u1ee5<\/td>\n<td>Nam ch\u00e2m Neodymium, Nam ch\u00e2m Ferrite<\/td>\n<td>\u0110inh s\u1eaft g\u1ea7n m\u1ed9t nam ch\u00e2m m\u1ea1nh<\/td>\n<\/tr>\n<tr>\n<td>S\u1eed d\u1ee5ng<\/td>\n<td>\u0110\u1ed9ng c\u01a1, c\u1ea3m bi\u1ebfn, loa<\/td>\n<td>L\u1edbp ch\u1eafn t\u1eeb, bi\u1ebfn \u00e1p<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a t\u1eebng lo\u1ea1i<\/h4>\n<p>T\u1eeb tr\u01b0\u1eddng v\u0129nh c\u1eedu l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a c\u00e1c mi\u1ec1n t\u1eeb b\u1ecb s\u1eafp x\u1ebfp theo h\u01b0\u1edbng trong m\u1ed9t v\u1eadt li\u1ec7u. C\u00e1c mi\u1ec1n n\u00e0y v\u1eabn duy tr\u00ec v\u1ecb tr\u00ed ngay c\u1ea3 khi t\u00e1c \u0111\u1ed9ng b\u00ean ngo\u00e0i b\u1ecb lo\u1ea1i b\u1ecf. Tr\u01b0\u1eddng t\u1ef1 duy tr\u00ec n\u00e0y c\u00f3 ngh\u0129a l\u00e0 v\u1eadt li\u1ec7u kh\u00f4ng c\u1ea7n ngu\u1ed3n \u0111i\u1ec7n.<\/p>\n<p>T\u1eeb tr\u01b0\u1eddng c\u1ea3m \u1ee9ng, ng\u01b0\u1ee3c l\u1ea1i, x\u1ea3y ra khi m\u1ed9t v\u1eadt th\u1ec3 b\u00ecnh th\u01b0\u1eddng kh\u00f4ng t\u1eeb tr\u1edf th\u00e0nh nam ch\u00e2m do g\u1ea7n m\u1ed9t tr\u01b0\u1eddng t\u1eeb. V\u1eadt th\u1ec3 ch\u1ec9 gi\u1eef t\u1eeb khi c\u00f2n ti\u1ebfp x\u00fac. Nguy\u00ean l\u00fd n\u00e0y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong nhi\u1ec1u \u1ee9ng d\u1ee5ng \u0111i\u1ec7n nh\u01b0 c\u1ea3m \u1ee9ng v\u00e0 nam ch\u00e2m \u0111i\u1ec7n.<\/p>\n<p><a href=\"https:\/\/nbaem.com\/vi\/magnets-materials\/\"><span style=\"color: #ff6600;\">Nam ch\u00e2m v\u0129nh c\u1eedu<\/span><\/a> l\u00e0 r\u1ea5t quan tr\u1ecdng trong thi\u1ebft k\u1ebf c\u00f4ng ngh\u1ec7. V\u00ed d\u1ee5, khi t\u00f4i l\u00e0m vi\u1ec7c v\u1ec1 <a href=\"https:\/\/nbaem.com\/vi\/products\/magnetic-motor-assembly\/\"><span style=\"color: #ff6600;\">b\u1ed9 \u0111\u1ed9ng c\u01a1<\/span><\/a> cho c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n \u0111i\u1ec7n nh\u1ecf, vi\u1ec7c ch\u1ecdn v\u1eadt li\u1ec7u nam ch\u00e2m v\u0129nh c\u1eedu ph\u00f9 h\u1ee3p \u0111\u00e3 ti\u1ebft ki\u1ec7m kh\u00f4ng gian v\u00e0 chi ph\u00ed \u0111\u00e1ng k\u1ec3. Trong khi \u0111\u00f3, ch\u00fang t\u00f4i s\u1eed d\u1ee5ng t\u1eeb tr\u01b0\u1eddng c\u1ea3m \u1ee9ng trong c\u00e1c \u1ee9ng d\u1ee5ng c\u1ea3m bi\u1ebfn n\u01a1i tr\u01b0\u1eddng ph\u1ea3i thay \u0111\u1ed5i theo \u0111\u1ea7u v\u00e0o.<\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>T\u1eeb tr\u01b0\u1eddng v\u0129nh c\u1eedu duy tr\u00ec \u1ed5n \u0111\u1ecbnh theo th\u1eddi gian m\u00e0 kh\u00f4ng c\u1ea7n t\u00e1c \u0111\u1ed9ng b\u00ean ngo\u00e0i, l\u00e0m cho n\u00f3 tr\u1edf n\u00ean thi\u1ebft y\u1ebfu trong \u0111i\u1ec7n t\u1eed, \u0111\u1ed9ng c\u01a1 v\u00e0 c\u00e1c thi\u1ebft b\u1ecb h\u00e0ng ng\u00e0y.<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>T\u1eeb tr\u01b0\u1eddng v\u0129nh c\u1eedu l\u00e0 g\u00ec? Nam ch\u00e2m c\u00f3 v\u1ebb \u0111\u01a1n gi\u1ea3n, nh\u01b0ng s\u1ee9c m\u1ea1nh c\u1ee7a ch\u00fang n\u1eb1m \u1edf c\u00e1c l\u1ef1c v\u00f4 h\u00ecnh t\u1ea1o n\u00ean c\u00f4ng ngh\u1ec7 hi\u1ec7n \u0111\u1ea1i. T\u1eeb \u0111i\u1ec7n tho\u1ea1i c\u1ee7a b\u1ea1n \u0111\u1ebfn \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n, t\u1eeb tr\u01b0\u1eddng gi\u00fap m\u1ecdi th\u1ee9 ho\u1ea1t \u0111\u1ed9ng. T\u1eeb tr\u01b0\u1eddng v\u0129nh c\u1eedu \u0111\u1ec1 c\u1eadp \u0111\u1ebfn tr\u01b0\u1eddng t\u1eeb \u1ed5n \u0111\u1ecbnh do m\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u t\u1ea1o ra m\u00e0 kh\u00f4ng c\u1ea7n ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng b\u00ean ngo\u00e0i. N\u00f3 [\u2026]<\/p>","protected":false},"author":1,"featured_media":1721,"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-1719","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"jetpack_featured_media_url":"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/07\/magnet-field-lines.jpg","_links":{"self":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1719","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=1719"}],"version-history":[{"count":6,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1719\/revisions"}],"predecessor-version":[{"id":2816,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1719\/revisions\/2816"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media\/1721"}],"wp:attachment":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media?parent=1719"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/categories?post=1719"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/tags?post=1719"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}