{"id":2569,"date":"2023-02-07T02:27:55","date_gmt":"2023-02-07T02:27:55","guid":{"rendered":"https:\/\/hsmagnet.com\/?p=2569"},"modified":"2025-09-03T06:40:33","modified_gmt":"2025-09-03T06:40:33","slug":"anwendungsprinzip-des-magneten-im-tachometer","status":"publish","type":"post","link":"https:\/\/hsmagnet.com\/de\/2023\/02\/07\/application-principle-of-magnet-in-speedometer\/","title":{"rendered":"Anwendungsprinzip des Magneten im Tachometer"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The speedometer, or speed meter, is an instrument used to measure and display the instantaneous speed of a vehicle. It was first introduced in the early 1900s as an optional device and became standard equipment around 1910. Today, speedometers are universally installed in automobiles, motorcycles, and adapted for other vehicles such as boats (pit log) and aircraft (airspeed indicator).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Magnets play a key role in the functioning of traditional analog speedometers, making them accurate, durable, and reliable.<\/p>\n\n\n\n<!--more-->\n\n\n<div class=\"root-eb-toc-gzl8s wp-block-essential-blocks-table-of-contents\"><div class=\"eb-parent-wrapper eb-parent-eb-toc-gzl8s \"><div class=\"eb-toc-container eb-toc-gzl8s  eb-toc-is-not-sticky eb-toc-not-collapsible eb-toc-initially-not-collapsed eb-toc-scrollToTop style-1 list-style-none\" data-scroll-top=\"false\" data-scroll-top-icon=\"fas fa-angle-up\" data-collapsible=\"false\" data-sticky-hide-mobile=\"false\" data-sticky=\"false\" data-scroll-target=\"scroll_to_toc\" data-copy-link=\"false\" data-editor-type=\"\" data-hide-desktop=\"false\" data-hide-tab=\"false\" data-hide-mobile=\"false\" data-itemcollapsed=\"false\" data-highlight-scroll=\"false\"><div class=\"eb-toc-header\"><h2 class=\"eb-toc-title\">Table of Contents<\/h2><\/div><div class=\"eb-toc-wrapper \" data-headers=\"[{&quot;level&quot;:3,&quot;content&quot;:&quot;How Does a Magnet Work in a Speedometer?&quot;,&quot;text&quot;:&quot;How Does a Magnet Work in a Speedometer?&quot;,&quot;link&quot;:&quot;how-does-a-magnet-work-in-a-speedometer&quot;},{&quot;level&quot;:3,&quot;content&quot;:&quot;Why Use Alnico Magnets in Speedometers?&quot;,&quot;text&quot;:&quot;Why Use Alnico Magnets in Speedometers?&quot;,&quot;link&quot;:&quot;why-use-alnico-magnets-in-speedometers&quot;},{&quot;level&quot;:3,&quot;content&quot;:&quot;Common Specifications of Alnico Magnets in Speedometers&quot;,&quot;text&quot;:&quot;Common Specifications of Alnico Magnets in Speedometers&quot;,&quot;link&quot;:&quot;common-specifications-of-alnico-magnets-in-speedometers&quot;},{&quot;level&quot;:3,&quot;content&quot;:&quot;Advantages of Magnetic Speedometers&quot;,&quot;text&quot;:&quot;Advantages of Magnetic Speedometers&quot;,&quot;link&quot;:&quot;advantages-of-magnetic-speedometers&quot;},{&quot;level&quot;:3,&quot;content&quot;:&quot;Conclusion&quot;,&quot;text&quot;:&quot;Conclusion&quot;,&quot;link&quot;:&quot;conclusion&quot;}]\" data-visible=\"[true,true,true,true,true,true]\" data-delete-headers=\"[{&quot;label&quot;:&quot;How Does a Magnet Work in a Speedometer?&quot;,&quot;value&quot;:&quot;how-does-a-magnet-work-in-a-speedometer&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;Why Use Alnico Magnets in Speedometers?&quot;,&quot;value&quot;:&quot;why-use-alnico-magnets-in-speedometers&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;Common Specifications of Alnico Magnets in Speedometers&quot;,&quot;value&quot;:&quot;common-specifications-of-alnico-magnets-in-speedometers&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;Advantages of Magnetic Speedometers&quot;,&quot;value&quot;:&quot;advantages-of-magnetic-speedometers&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;Conclusion&quot;,&quot;value&quot;:&quot;conclusion&quot;,&quot;isDelete&quot;:false}]\" data-smooth=\"true\" data-top-offset=\"\"><div class=\"eb-toc__list-wrap\"><ul class=\"eb-toc__list\"><li><a href=\"#how-does-a-magnet-work-in-a-speedometer\">How Does a Magnet Work in a Speedometer?<\/a><li><a href=\"#why-use-alnico-magnets-in-speedometers\">Why Use Alnico Magnets in Speedometers?<\/a><li><a href=\"#common-specifications-of-alnico-magnets-in-speedometers\">Common Specifications of Alnico Magnets in Speedometers<\/a><li><a href=\"#advantages-of-magnetic-speedometers\">Advantages of Magnetic Speedometers<\/a><li><a href=\"#conclusion\">Conclusion<\/a><\/ul><\/div><\/div><\/div><\/div><\/div>\n\n\n<h3 class=\"wp-block-heading\">How Does a Magnet Work in a Speedometer?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In mechanical speedometers, a <strong>permanent magnet<\/strong> is attached to the rotating speedometer cable, which is driven by the transmission. As the vehicle moves, the magnet rotates near an aluminum cup, also called a <em>speedcup<\/em>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The rotating magnet generates a <strong>changing magnetic field<\/strong>, which induces <strong>eddy currents<\/strong> in the aluminum cup.<\/li>\n\n\n\n<li>These eddy currents create a secondary magnetic field, exerting torque on the cup and causing it to rotate.<\/li>\n\n\n\n<li>The cup is connected to the pointer shaft, which moves across the dial to indicate speed.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">To ensure accuracy, a <strong>torsion spring<\/strong> resists the torque. The balance between the spring\u2019s resistance and the magnetic drag ensures that the pointer\u2019s deflection is directly proportional to vehicle speed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This principle allows a speedometer to measure speed <strong>without direct mechanical contact<\/strong>, reducing wear and improving longevity.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/hsmagnet.com\/wp-content\/uploads\/2023\/02\/Diagram-of-magnet-and-aluminum-cup-interaction-in-a-mechanical-speedometer-1024x683.webp\" alt=\"Diagram of magnet and aluminum cup interaction in a mechanical speedometer\" class=\"wp-image-13530\" srcset=\"https:\/\/hsmagnet.com\/wp-content\/uploads\/2023\/02\/Diagram-of-magnet-and-aluminum-cup-interaction-in-a-mechanical-speedometer-1024x683.webp 1024w, https:\/\/hsmagnet.com\/wp-content\/uploads\/2023\/02\/Diagram-of-magnet-and-aluminum-cup-interaction-in-a-mechanical-speedometer-300x200.webp 300w, https:\/\/hsmagnet.com\/wp-content\/uploads\/2023\/02\/Diagram-of-magnet-and-aluminum-cup-interaction-in-a-mechanical-speedometer-768x512.webp 768w, https:\/\/hsmagnet.com\/wp-content\/uploads\/2023\/02\/Diagram-of-magnet-and-aluminum-cup-interaction-in-a-mechanical-speedometer-600x400.webp 600w, https:\/\/hsmagnet.com\/wp-content\/uploads\/2023\/02\/Diagram-of-magnet-and-aluminum-cup-interaction-in-a-mechanical-speedometer.webp 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Why Use Alnico Magnets in Speedometers?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Alnico magnets (mainly Alnico 2 or Alnico 5) are widely used in analog speedometers due to their:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>High thermal stability<\/strong>: Reliable performance in varying engine and environmental temperatures.<\/li>\n\n\n\n<li><strong>Strong magnetic properties<\/strong>: Ensures consistent eddy current generation.<\/li>\n\n\n\n<li><strong>Long-lasting magnetism<\/strong>: Minimal loss of magnetic field strength over time.<\/li>\n\n\n\n<li><strong>Machinability<\/strong>: Can be manufactured in precise shapes and sizes required for speedometer assemblies.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Common Specifications of Alnico Magnets in Speedometers<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>23 \u00d7 13.5 \u00d7 3 mm<\/strong> without injection molding<\/li>\n\n\n\n<li><strong>2.3 \u00d7 6 \u00d7 (3.5\u20134) mm<\/strong> with 3, 4, or 6 molding holes<\/li>\n\n\n\n<li><strong>23 \u00d7 6 \u00d7 3.47 mm<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These sizes are optimized for compact instrument assemblies and can be customized based on OEM requirements.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/hsmagnet.com\/wp-content\/uploads\/2023\/02\/Alnico-magnets-used-in-analog-speedometers-with-standard-dimensions.webp\" alt=\"Alnico magnets used in analog speedometers with standard dimensions\" class=\"wp-image-13531\" srcset=\"https:\/\/hsmagnet.com\/wp-content\/uploads\/2023\/02\/Alnico-magnets-used-in-analog-speedometers-with-standard-dimensions.webp 800w, https:\/\/hsmagnet.com\/wp-content\/uploads\/2023\/02\/Alnico-magnets-used-in-analog-speedometers-with-standard-dimensions-300x300.webp 300w, https:\/\/hsmagnet.com\/wp-content\/uploads\/2023\/02\/Alnico-magnets-used-in-analog-speedometers-with-standard-dimensions-150x150.webp 150w, https:\/\/hsmagnet.com\/wp-content\/uploads\/2023\/02\/Alnico-magnets-used-in-analog-speedometers-with-standard-dimensions-768x768.webp 768w, https:\/\/hsmagnet.com\/wp-content\/uploads\/2023\/02\/Alnico-magnets-used-in-analog-speedometers-with-standard-dimensions-600x600.webp 600w, https:\/\/hsmagnet.com\/wp-content\/uploads\/2023\/02\/Alnico-magnets-used-in-analog-speedometers-with-standard-dimensions-100x100.webp 100w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Advantages of Magnetic Speedometers<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Durability<\/strong> \u2013 fewer mechanical contacts reduce wear and tear.<\/li>\n\n\n\n<li><strong>Accuracy<\/strong> \u2013 proportional movement ensures precise readings.<\/li>\n\n\n\n<li><strong>Reliability<\/strong> \u2013 stable magnetism guarantees consistent performance.<\/li>\n\n\n\n<li><strong>Cost-effectiveness<\/strong> \u2013 simple, proven design widely used in the automotive industry.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Conclusion<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Magnets, particularly <strong><a href=\"https:\/\/hsmagnet.com\/magnetic-materials\/alnico-magnets\/\">Alnico magnets<\/a><\/strong>, are the backbone of traditional analog speedometers. Their role in generating eddy currents and translating rotational speed into accurate readings ensures that speedometers remain both precise and durable. For automotive manufacturers and instrument suppliers, selecting the right magnet specifications is essential to maintaining performance and reliability.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The speedometer, or speed meter, is an instrument used to measure and display the instantaneous speed of a vehicle. It was first introduced in the early 1900s as an optional device and became standard equipment around 1910. Today, speedometers are universally installed in automobiles, motorcycles, and adapted for other vehicles such as boats (pit log) [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":13529,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_eb_attr":"","footnotes":""},"categories":[22],"tags":[],"class_list":["post-2569","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-magnetic-applicaitons"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Application Principle of Magnet in Speedometer | Alnico Magnet for Automotive Instruments<\/title>\n<meta name=\"description\" content=\"Discover how Alnico magnets are applied in speedometers to ensure accurate vehicle speed measurement. 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