{"id":3794,"date":"2019-06-13T13:30:05","date_gmt":"2019-06-13T13:30:05","guid":{"rendered":"https:\/\/novanta.com\/robotics-automation\/rvdt-rotary-variable-differential-transformer\/"},"modified":"2026-01-29T04:40:42","modified_gmt":"2026-01-29T04:40:42","slug":"rvdt-rotary-variable-differential-transformer","status":"publish","type":"page","link":"https:\/\/novanta.com\/robotics-automation\/rvdt-rotary-variable-differential-transformer\/","title":{"rendered":"Rotary Variable Differential Transformer (RVDT)"},"content":{"rendered":"\n\n\n<div class=\"wp-block-group alignwide is-layout-flow wp-block-group-is-layout-flow\" style=\"margin-top:var(--wp--preset--spacing--40);margin-bottom:var(--wp--preset--spacing--40)\">\n\t\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-fe9cc265 wp-block-group-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\"><p>RVDT \u2013 Rotary Variable Differential Transformers are a well-established form of rotary position sensor for non-contact measurement of angle. RVDTs have a solid reputation for robustness and reliability in harsh conditions, and equipment manufacturers in the <a href=\"https:\/\/novanta.com\/robotics-automation\/industries\/aerospace\/\" target=\"_blank\" rel=\"noopener noreferrer\">aerospace<\/a> and <a href=\"https:\/\/www.celeramotion.com\/applications\/industrial\/oil-gas-ssin-21\/\" target=\"_blank\" rel=\"noopener noreferrer\">oil &amp; gas<\/a> sectors typically consider RVDTs as the default choice for high reliability or safety-related applications such as missile seekers, precision avionics and high precision servo controls.<\/p>\n\n<h2 class=\"wp-block-heading\">Common Applications of RVDTs<\/h2>\n\n<p>Some of the most common areas RVDTs are used in include:<\/p>\n\n<ul class=\"wp-block-list\"><li style=\"font-weight: 400\">Aerospace <\/li><li style=\"font-weight: 400\">Industrial Automation<\/li><li style=\"font-weight: 400\">Robotics<\/li><li style=\"font-weight: 400\">Military Applications<\/li><\/ul>\n\n<h2 class=\"wp-block-heading\">Modern Alternative to RVDTs<\/h2>\n\n<p>However, RVDTs do have a number of disadvantages when compared with inductive encoders. Zettlex IncOders utilise the same physical principles as RVDTs and so exhibit similarly high levels of reliability, robustness and safety assurance within harsh environments. Whereas RVDTs are typically constructed from wire windings arranged as a transformer, Zettlex inductive encoders use printed circuit boards as their main components and, unlike RVDTs, there is no need for separate signal generation and processing electronics. This results in smaller, lighter and less costly sensor constructions, providing much greater design and integration flexibility.<\/p>\n\n<p>Zettlex <a href=\"https:\/\/www.celeramotion.com\/inductive-sensors\/products\/incoder-inductive-encoders\/\">inductive encoders<\/a> also offer higher accuracy than RVDTs of comparable diameter and are proven for providing reliable angular position and speed feedback within extreme environment applications. Zettlex inductive encoders are typically supplied with a DC power source and generate an absolute digital signal.<\/p><\/div>\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<figure class=\"wp-block-image size-full aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"863\" src=\"https:\/\/novanta.com\/robotics-automation\/wp-content\/uploads\/sites\/3\/2019\/06\/RVDT-variable.jpg\" alt=\"\" class=\"wp-image-3793\" srcset=\"https:\/\/novanta.com\/robotics-automation\/wp-content\/uploads\/sites\/3\/2019\/06\/RVDT-variable.jpg?quality=85&amp;strip=all 1000w, https:\/\/novanta.com\/robotics-automation\/wp-content\/uploads\/sites\/3\/2019\/06\/RVDT-variable.jpg?resize=320%2C276&amp;quality=85&amp;strip=all 320w, https:\/\/novanta.com\/robotics-automation\/wp-content\/uploads\/sites\/3\/2019\/06\/RVDT-variable.jpg?resize=400%2C345&amp;quality=85&amp;strip=all 400w, https:\/\/novanta.com\/robotics-automation\/wp-content\/uploads\/sites\/3\/2019\/06\/RVDT-variable.jpg?resize=840%2C725&amp;quality=85&amp;strip=all 840w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n<p><strong>Fig.1. <a href=\"https:\/\/www.celeramotion.com\/inductive-sensors\/inductive-encoder\/\">Zettlex Inductive Encoders<\/a> are smaller, lighter and less costly than RVDTs, providing much greater design and integration flexibility<\/strong><\/p>\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<div class=\"wp-block-button has-arrow\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.celeramotion.com\/inductive-sensors\/products\/incoder-inductive-encoders\/\">IncOder Technology<\/a><\/div>\n<\/div>\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<div class=\"wp-block-button has-arrow\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/novanta.com\/robotics-automation\/technical-paper\/inductive-sensors\/\">Zettlex Products<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><h2 class=\"wp-block-heading\">RVDT Vs LVDT<\/h2>\n\n<p>Both RVDTs and LVDTs are electromagnetic transducers used to measure position or displacement. There is however one key difference between the two, LVDTs are typically used for linear position sensing, whereas RVDTs are typically used for angular position sensing.<\/p>\n\n<h2 class=\"wp-block-heading\">RVTD Sensors FAQs <\/h2>\n\n<h3 class=\"wp-block-heading\">What is an RVDT sensor?<\/h3>\n\n<p><b>A Rotary Variable Differential Transformer (RVDT) is a sensor used to measure angular displacement.<\/b> It operates by converting rotary motion into a corresponding electrical signal, which can then be used to determine the angle of rotation. <\/p>\n\n<h3 class=\"wp-block-heading\">On what principle does RVDT work?<\/h3>\n\n<p>RVDT (Rotary Variable Differential Transformer) <b>works on the principle of electromagnetic induction<\/b>. It consists of a primary winding, two secondary windings, and a movable core. As the core rotates, it changes the magnetic coupling between the primary and secondary windings, generating differential voltages.<\/p>\n\n<h3 class=\"wp-block-heading\">Are RVDT Sensors reliable?<\/h3>\n\n<p><b>Yes, RVDT sensors are reliable.<\/b> They provide accurate, repeatable measurements, have a long lifespan due to their non-contact design, and perform well in harsh environments, making them suitable for critical applications.<\/p>\n\n<h3 class=\"wp-block-heading\">Is RVDT a passive or active transducer?<\/h3>\n\n<p><b>RVDT is a passive transducer.<\/b> It requires an external AC power source to operate and generate output signals based on changes in the magnetic field caused by the movement of its core.<\/p>\n\n<h2 class=\"wp-block-heading\">Contact us about RVTD Sensors<\/h2>\n\n<p>If you are interested in the RVTD Sensors that <a href=\"https:\/\/novanta.com\/robotics-automation\/wp-content\/uploads\/sites\/3\/2015\/04\/LMDxE57-85C.pdf\">Celara Motion<\/a> has to offer, then get in contact with us today to make an inquiry. All you have to do is simply fill out our form with some basic information about you and your business and enquire about our RVDT sensors. Our team of experts will then get back to you and offer all the information you need.<\/p>\n\n\n<div class=\"wp-block-button has-arrow\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.celeramotion.com\/contact\/\">Contact Us<\/a><\/div>\n\n\n<h3 class=\"wp-block-heading\">More Inductive Sensors from Celera<\/h3>\n\n<p>If you like the RVDT Sensors we have to offer, then make sure you check out some of our other precise and accurate <a href=\"https:\/\/novanta.com\/robotics-automation\/technical-paper\/inductive-sensors\/\">Inductive Sensors<\/a>. We have a wide range of sensors, so you can be sure you will find the inductive sensor solution which best suits your needs. Find some of our most popular products below:<\/p>\n\n<ul class=\"wp-block-list\"><li style=\"font-weight: 400\"><a href=\"https:\/\/www.celeramotion.com\/inductive-sensors\/products\/incoder-inductive-encoders\/\">IncOder Series<\/a> <\/li><li style=\"font-weight: 400\"><a href=\"https:\/\/www.celeramotion.com\/ultra-incoder\/\">Ultra IncOder Series<\/a><\/li><li style=\"font-weight: 400\"><a href=\"https:\/\/novanta.com\/robotics-automation\/post\/3965\">IncOder Core<\/a><\/li><li style=\"font-weight: 400\"><a href=\"https:\/\/www.celeramotion.com\/multiturn-incoder\/\">Multiturn IncOder<\/a><\/li><li style=\"font-weight: 400\"><a href=\"https:\/\/novanta.com\/robotics-automation\/post\/3976\">Shaft IncOder<\/a><\/li><li style=\"font-weight: 400\"><a href=\"https:\/\/www.celeramotion.com\/inductive-sensors\/products\/oem-rotary-position-sensors\/\">OEM Rotary<\/a><\/li><li style=\"font-weight: 400\"><a href=\"https:\/\/www.celeramotion.com\/inductive-sensors\/products\/oem-linear-position-sensors\/\">OEM Linear<\/a><\/li><li style=\"font-weight: 400\"><a href=\"https:\/\/www.celeramotion.com\/inductive-sensors\/custom-sensors\/\">Custom Position Sensors<\/a><\/li><\/ul>\n\n<p>We also provide full support for all of our Inductive sensors including, <a href=\"https:\/\/novanta.com\/robotics-automation\/support-3\/technical-papers\/\">technical papers<\/a>, FAQs for products and Documentation for our products.<\/p><\/div>\n<\/div>\n\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>RVDT \u2013 Rotary Variable Differential Transformers are a well-established form of rotary position sensor for non-contact measurement of angle. RVDTs have a solid reputation for robustness and reliability in harsh conditions, and equipment manufacturers in the aerospace and oil &amp; gas sectors typically consider RVDTs as the default choice for high reliability or safety-related applications [&hellip;]<\/p>\n","protected":false},"author":100,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-3794","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>RDVT Sensors | Zettlex Inductive Encoders | Celera Motion<\/title>\n<meta name=\"description\" content=\"RDVT sensors: Unlock unparalleled accuracy in rotary position sensing. 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