{"id":3988,"date":"2026-05-19T07:25:47","date_gmt":"2026-05-19T07:25:47","guid":{"rendered":"https:\/\/nexalmagnetics.com\/?p=3988"},"modified":"2026-05-19T09:56:29","modified_gmt":"2026-05-19T09:56:29","slug":"the-engineering-guide-to-preventing-magnet-demagnetization","status":"publish","type":"post","link":"https:\/\/nexalmagnetics.com\/zh\/the-engineering-guide-to-preventing-magnet-demagnetization\/","title":{"rendered":"\u9ad8\u626d\u77e9\u7535\u673a\u9632\u6b62\u78c1\u4f53\u9000\u78c1\u7684\u5de5\u7a0b\u6307\u5357"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"3988\" class=\"elementor elementor-3988\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b09f1a4 e-flex e-con-boxed e-con e-parent\" data-id=\"b09f1a4\" data-element_type=\"container\" data-e-type=\"container\" id=\"SingleCase\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div 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fill-rule=\"evenodd\" fill=\"#000000\" fill-opacity=\"1\"><\/path><\/g><\/svg>\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-835cfc0 elementor-widget elementor-widget-heading\" data-id=\"835cfc0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/nexalmagnetics.com\/zh\/market\/\">Back<\/a><\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1a1a51b e-con-full e-flex e-con e-child\" data-id=\"1a1a51b\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-e6a2359 e-con-full e-flex e-con e-child\" data-id=\"e6a2359\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7ddf715 elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"7ddf715\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">The Engineering Guide to Preventing Magnet Demagnetization in High-Torque Motors<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-98e3e14 elementor-widget elementor-widget-heading\" data-id=\"98e3e14\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><i>Quick Summary<\/i><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-feac8f3 elementor-widget elementor-widget-text-editor\" data-id=\"feac8f3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-path-to-node=\"8\">Irreversible demagnetization in high-torque motors isn&#8217;t just a material issue\u2014it&#8217;s heavily driven by <b data-path-to-node=\"6,0\" data-index-in-node=\"126\">micro-thermal hotspots<\/b> caused by uneven air gaps. Controlling physical tolerances within <b data-path-to-node=\"6,0\" data-index-in-node=\"215\"><span class=\"math-inline\" data-math=\"\\pm0.02\\text{mm}\" data-index-in-node=\"215\"><span class=\"katex\"><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\">\u00b1<\/span><span class=\"mord\">0.02<\/span><span class=\"mord text\"><span class=\"mord\">mm<\/span><\/span><\/span><\/span><\/span><\/span><\/b> is the unsung hero of thermal stability.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4c0b646 elementor-widget elementor-widget-image\" data-id=\"4c0b646\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1679\" height=\"842\" src=\"https:\/\/nexalmagnetics.com\/wp-content\/uploads\/2026\/05\/Tolerance1.jpg\" class=\"attachment-full size-full wp-image-4033\" alt=\"\" srcset=\"https:\/\/nexalmagnetics.com\/wp-content\/uploads\/2026\/05\/Tolerance1.jpg 1679w, https:\/\/nexalmagnetics.com\/wp-content\/uploads\/2026\/05\/Tolerance1-300x150.jpg 300w, https:\/\/nexalmagnetics.com\/wp-content\/uploads\/2026\/05\/Tolerance1-1024x514.jpg 1024w, https:\/\/nexalmagnetics.com\/wp-content\/uploads\/2026\/05\/Tolerance1-768x385.jpg 768w, https:\/\/nexalmagnetics.com\/wp-content\/uploads\/2026\/05\/Tolerance1-1536x770.jpg 1536w, https:\/\/nexalmagnetics.com\/wp-content\/uploads\/2026\/05\/Tolerance1-18x9.jpg 18w\" sizes=\"(max-width: 1679px) 100vw, 1679px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e5c980f elementor-widget elementor-widget-heading\" data-id=\"e5c980f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><i>1. The Dual Triggers of Failure<\/i><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a6938b9 elementor-widget elementor-widget-text-editor\" data-id=\"a6938b9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-path-to-node=\"12\">Demagnetization is rarely a single-factor event. It happens when two stresses collide:<\/p><ul data-path-to-node=\"10\"><li><p data-path-to-node=\"10,0,0\"><b data-path-to-node=\"10,0,0\" data-index-in-node=\"0\">Thermal Stress:<\/b> Operating temperatures exceed the magnet&#8217;s limit (<span class=\"math-inline\" data-math=\"T_{max}\" data-index-in-node=\"66\"><span class=\"katex\"><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mord mathnormal\">T<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mathnormal mtight\">ma<\/span><span class=\"mord mathnormal mtight\">x<\/span><\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>), dropping intrinsic coercivity (<span class=\"math-inline\" data-math=\"H_{cj}\" data-index-in-node=\"107\"><span class=\"katex\"><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mord mathnormal\">H<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mathnormal mtight\">c<\/span><span class=\"mord mathnormal mtight\">j<\/span><\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>).<\/p><\/li><li><p data-path-to-node=\"10,1,0\"><b data-path-to-node=\"10,1,0\" data-index-in-node=\"0\">Magnetic Stress:<\/b> Peak torque demands or short circuits generate massive <b data-path-to-node=\"10,1,0\" data-index-in-node=\"72\">reverse fields <\/b>(<span class=\"math-inline\" data-math=\"H_d\" data-index-in-node=\"88\"><span class=\"katex\"><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mord mathnormal\">H<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mathnormal mtight\">d<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>) from the stator, permanently flipping magnetic domains.<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f03192f elementor-widget elementor-widget-heading\" data-id=\"f03192f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><i>2. Material Matrix: Performance vs. Cost<\/i><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bca3528 elementor-widget elementor-widget-text-editor\" data-id=\"bca3528\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<table data-path-to-node=\"14\"><thead><tr><td><strong>Technology<\/strong><\/td><td><strong>Remanence (Br\u200b)<\/strong><\/td><td><strong>Coercivity (Hcj\u200b)<\/strong><\/td><td><strong>Raw Material Cost<\/strong><\/td><td><strong>Best For<\/strong><\/td><\/tr><\/thead><tbody><tr><td><span data-path-to-node=\"14,1,0,0\"><b data-path-to-node=\"14,1,0,0\" data-index-in-node=\"0\">Standard Heavy Alloy<\/b><\/span><\/td><td><span data-path-to-node=\"14,1,1,0\">Decreased<\/span><\/td><td><span data-path-to-node=\"14,1,2,0\">Increased<\/span><\/td><td><span data-path-to-node=\"14,1,3,0\">High (Heavy Rare Earths)<\/span><\/td><td><span data-path-to-node=\"14,1,4,0\">Legacy Designs<\/span><\/td><\/tr><tr><td><span data-path-to-node=\"14,2,0,0\"><b data-path-to-node=\"14,2,0,0\" data-index-in-node=\"0\">GBD Technology<\/b><\/span><\/td><td><span style=\"color: #0e55ac;\" data-path-to-node=\"14,2,1,0\"><b data-path-to-node=\"14,2,1,0\" data-index-in-node=\"0\">Preserved<\/b><\/span><\/td><td><span style=\"color: #0e55ac;\" data-path-to-node=\"14,2,2,0\"><b data-path-to-node=\"14,2,2,0\" data-index-in-node=\"0\">Drastically High<\/b><\/span><\/td><td><span style=\"color: #0e55ac;\"><strong>Optimized<\/strong><\/span><\/td><td><span style=\"color: #0e55ac;\"><strong>High-Torque \/ Cost-Sensitive<\/strong><\/span><\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cda0629 elementor-widget elementor-widget-heading\" data-id=\"cda0629\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><i>3. The Hidden Catalyst: Air Gap Uniformity<\/i><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7f895bc elementor-widget elementor-widget-text-editor\" data-id=\"7f895bc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-path-to-node=\"17\">Many motor designers overlook the direct link between <b data-path-to-node=\"17\" data-index-in-node=\"54\">mechanical tolerances<\/b> and <b data-path-to-node=\"17\" data-index-in-node=\"80\">magnetic stability<\/b>.<\/p><div class=\"code-block ng-tns-c2714810560-80 ng-animate-disabled ng-trigger ng-trigger-codeBlockRevealAnimation\" data-hveid=\"0\" data-ved=\"0CAAQhtANahgKEwjlkMrc2MSUAxUAAAAAHQAAAAAQigE\"><div class=\"formatted-code-block-internal-container ng-tns-c2714810560-80\"><div class=\"animated-opacity ng-tns-c2714810560-80\"><pre class=\"ng-tns-c2714810560-80\"><span style=\"color: #0e55ac;\"><em><code class=\"code-container formatted ng-tns-c2714810560-80 no-decoration-radius\" role=\"text\" data-test-id=\"code-content\">[Industry Standard: \u00b10.05mm] \u2794 [Uneven Air Gap] \u2794 [Localized Eddy Currents] \u2794 [Hidden Hotspots] \u2794 [Localized Demagnetization]\n<\/code><\/em><\/span><\/pre><\/div><\/div><\/div><p data-path-to-node=\"19\">When magnets have standard <span class=\"math-inline\" data-math=\"\\pm0.05\\text{mm}\" data-index-in-node=\"27\"><span class=\"katex\"><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\">\u00b1<\/span><span class=\"mord\">0.05<\/span><span class=\"mord text\"><span class=\"mord\">mm<\/span><\/span><\/span><\/span><\/span><\/span> variations, it creates an asymmetrical air gap. This distortion triggers localized <b data-path-to-node=\"19\" data-index-in-node=\"127\">eddy current losses<\/b>, creating hidden surface hotspots that push segments of the magnet past their thermal threshold.<\/p><p data-path-to-node=\"19\"><span style=\"color: #333333;\"><span style=\"color: #0e55ac;\"><b style=\"font-family: inherit; font-size: inherit; font-style: inherit; font-variant-caps: inherit; text-align: var(--text-align); letter-spacing: var(--theme-letter-spacing); text-transform: var(--theme-text-transform);\" data-path-to-node=\"20,0\" data-index-in-node=\"4\">The Nexal Solution:<\/b><\/span><span style=\"font-family: inherit; font-size: inherit; font-style: inherit; font-variant-caps: inherit; text-align: var(--text-align); letter-spacing: var(--theme-letter-spacing); text-transform: var(--theme-text-transform);\">\u00a0<\/span><strong><span style=\"font-family: inherit; font-size: inherit; font-style: inherit; font-variant-caps: inherit; text-align: var(--text-align); letter-spacing: var(--theme-letter-spacing); text-transform: var(--theme-text-transform);\">By holding geometric tolerances of custom shapes within <\/span><span class=\"math-inline\" data-math=\"\\pm0.02\\text{mm}\" data-index-in-node=\"80\"><span class=\"katex\"><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\">\u00b1<\/span><span class=\"mord\">0.02<\/span><span class=\"mord text\"><span class=\"mord\">mm<\/span><\/span><\/span><\/span><\/span><\/span><span style=\"font-family: inherit; font-size: inherit; font-style: inherit; font-variant-caps: inherit; text-align: var(--text-align); letter-spacing: var(--theme-letter-spacing); text-transform: var(--theme-text-transform);\">, Nexal ensures a perfectly uniform air gap, eliminating variance-induced thermal risks.<\/span><\/strong><\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b61c5b2 elementor-widget elementor-widget-heading\" data-id=\"b61c5b2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><i>4. Verification: 100% Automation vs. Sampling<\/i><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-64fe804 elementor-widget elementor-widget-text-editor\" data-id=\"64fe804\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-path-to-node=\"23\">In high-torque motors, a single weak magnet causes a 100% assembly failure. Standard batch sampling is no longer enough.<\/p><ul data-path-to-node=\"24\"><li><p data-path-to-node=\"24,0,0\"><b data-path-to-node=\"24,0,0\" data-index-in-node=\"0\">100% Automated Inspection:<\/b> Mapping surface magnetic flux on every single piece.<\/p><\/li><li><p data-path-to-node=\"24,1,0\"><b data-path-to-node=\"24,1,0\" data-index-in-node=\"0\">Angle Verification:<\/b> Eliminating manual guesswork before the product leaves the facility.<\/p><\/li><li><p data-path-to-node=\"24,2,0\"><b data-path-to-node=\"24,2,0\" data-index-in-node=\"0\">Full Traceability:<\/b> Certified to <b data-path-to-node=\"24,2,0\" data-index-in-node=\"32\">ISO 9001 &amp; IATF 16949<\/b> automotive standards.<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2eb958a elementor-widget elementor-widget-heading\" data-id=\"2eb958a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><i>Conclusion: Partner, Don't Just Source<\/i><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a2d853d elementor-widget elementor-widget-text-editor\" data-id=\"a2d853d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><b data-path-to-node=\"27\" data-index-in-node=\"0\">Looking to review a custom magnet drawing or run a thermal simulation?<\/b><\/p><p>Contact Nexal&#8217;s Engineering Team for a Zero-MOQ sample consultation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9ce5357 elementor-mobile-align-justify elementor-align-left elementor-widget elementor-widget-button\" data-id=\"9ce5357\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/nexalmagnetics.com\/zh\/contact\/\" id=\"back-to-applications\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Contact Us<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Back Quick Summary Irreversible demagnetization in high-torque motors isn&#8217;t just a material issue\u2014it&#8217;s heavily driven by micro-thermal hotspots caused by uneven air gaps. Controlling physical tolerances within \u00b10.02mm is the unsung hero of thermal stability. 1. The Dual Triggers of Failure Demagnetization is rarely a single-factor event. It happens when two stresses collide: Thermal Stress: [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":278,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3988","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/nexalmagnetics.com\/zh\/wp-json\/wp\/v2\/posts\/3988","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nexalmagnetics.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nexalmagnetics.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nexalmagnetics.com\/zh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nexalmagnetics.com\/zh\/wp-json\/wp\/v2\/comments?post=3988"}],"version-history":[{"count":16,"href":"https:\/\/nexalmagnetics.com\/zh\/wp-json\/wp\/v2\/posts\/3988\/revisions"}],"predecessor-version":[{"id":4040,"href":"https:\/\/nexalmagnetics.com\/zh\/wp-json\/wp\/v2\/posts\/3988\/revisions\/4040"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nexalmagnetics.com\/zh\/wp-json\/wp\/v2\/media\/278"}],"wp:attachment":[{"href":"https:\/\/nexalmagnetics.com\/zh\/wp-json\/wp\/v2\/media?parent=3988"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nexalmagnetics.com\/zh\/wp-json\/wp\/v2\/categories?post=3988"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nexalmagnetics.com\/zh\/wp-json\/wp\/v2\/tags?post=3988"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}