{"id":8990,"date":"2025-09-01T08:45:14","date_gmt":"2025-09-01T07:45:14","guid":{"rendered":"https:\/\/ojelectronics.com\/drives\/?p=8990"},"modified":"2026-08-10T13:55:59","modified_gmt":"2026-08-10T12:55:59","slug":"right-pulley-and-motor-size","status":"publish","type":"post","link":"https:\/\/ojelectronics.com\/drives\/news-heat-recovery\/right-pulley-and-motor-size\/","title":{"rendered":"Choosing the Right Pulley and Motor Size for Your Rotary Heat Exchanger"},"content":{"rendered":"Choosing the right pulley for your rotary heat exchanger can be trickier than you might think. It\u2019s not rocket science, but there are some calculations you\u2019ll need to make to get it right. This brief article takes you through the process, so you end up with the most cost-efficient setup possible.<h2><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-9069\" src=\"https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/rotary-heat-exchanger-new-249x300.png\" alt=\"\" width=\"500\" height=\"601\" srcset=\"https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/rotary-heat-exchanger-new-249x300.png 249w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/rotary-heat-exchanger-new-852x1024.png 852w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/rotary-heat-exchanger-new-768x924.png 768w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/rotary-heat-exchanger-new.png 1121w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/>Pulley and Motor Size<\/h2>\n<p>The important thing to keep in mind when thinking about pulley size is that you don\u2019t want to use a larger pulley than you need. Your actual pulley should be a little larger than the minimum size you calculate, but only the next size up.<\/p>\n<h2><\/h2>\n<h2>Here\u2019s How to Get There, Step by Step.<\/h2>\n<h3><strong>STEP 1\u00a0<\/strong><\/h3>\n<blockquote><p><strong>Determine Your Desired Rotor Speed<\/strong><\/p><\/blockquote>\n<p>The speed you\u2019ll want your rotor to turn at depends on the type of rotor you have chosen and other factors specific to your exact setup. If in doubt, we recommend talking to the manufacturer of your rotor.<\/p>\n<h3><\/h3>\n<h3><strong>STEP 2<\/strong><\/h3>\n<blockquote><p><strong>Calculate Your Ideal Speed Ratio<\/strong><\/p><\/blockquote>\n<p>Your ideal speed ratio, or gearing, is the ratio between your rotor speed and the speed at which you want the motor to run. To calculate this, divide your maximum desired rotor speed by the maximum speed at which you want your maximum desired motor speed.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-9282\" src=\"https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/calculation-step2-new-300x142.png\" alt=\"\" width=\"400\" height=\"189\" srcset=\"https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/calculation-step2-new-300x142.png 300w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/calculation-step2-new-1024x485.png 1024w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/calculation-step2-new-768x364.png 768w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/calculation-step2-new-1536x727.png 1536w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/calculation-step2-new-2048x970.png 2048w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<p style=\"text-align: left;\">The result is your optimal speed ratio.<\/p>\n<p>&nbsp;<\/p>\n<h3><\/h3>\n<h3><strong>STEP 3<\/strong><\/h3>\n<blockquote><p><strong>Determine Your Minimum Pulley Size<\/strong><\/p><\/blockquote>\n<p>To determine the minimum pulley size for your setup, you\u2019ll need to perform another calculation \u2013 this time dividing your rotor diameter by the speed ratio you arrived at under Step 2.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-9090\" src=\"https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/calculation-step3-new-300x131.png\" alt=\"\" width=\"400\" height=\"175\" srcset=\"https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/calculation-step3-new-300x131.png 300w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/calculation-step3-new-1024x447.png 1024w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/calculation-step3-new-768x335.png 768w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/calculation-step3-new-1536x670.png 1536w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/calculation-step3-new-2048x894.png 2048w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<h3><\/h3>\n<h3><strong>STEP 4<\/strong><\/h3>\n<blockquote><p><strong>Choose Your Pully Size and Recalculate Speed Ratio<\/strong><\/p><\/blockquote>\n<p>Pulleys come in fixed sizes, and you will always want to choose the next available size up from the minimum size you calculated in step 3. If you go any higher, your pulley will be too large, and this will cost you performance. Once you have chosen the next size up \u2013 let\u2019s say 75 mm based on your 67.6 minimum \u2013 you will want to recalculate your actual speed ratio.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-9031\" src=\"https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/08\/calculation-step4-300x139.png\" alt=\"\" width=\"400\" height=\"185\" srcset=\"https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/08\/calculation-step4-300x139.png 300w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/08\/calculation-step4-1024x474.png 1024w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/08\/calculation-step4-768x355.png 768w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/08\/calculation-step4-1536x711.png 1536w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/08\/calculation-step4-2048x948.png 2048w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<h4><strong>Congratulations!<\/strong><\/h4>\n<p>You now have your chosen pulley size \u2013 75 mm \u2013 and calculated your actual speed ratio. But while we\u2019re at it, let\u2019s look at one more factor \u2013 desired motor torque \u2013 and how to calculate your way to the right-sized <a href=\"https:\/\/ojelectronics.com\/drives\/products\/oj-mrhx-stepper-motor\/\">OJ MRHX motor<\/a> and <a href=\"https:\/\/ojelectronics.com\/drives\/products\/oj-drhx-modbus-control\/\">DRHX drive<\/a>.<\/p>\n<h3><\/h3>\n<h3><strong>STEP 5<\/strong><\/h3>\n<blockquote><p><strong>Determine How Much Torque Your Motor Should provide<\/strong><\/p><\/blockquote>\n<p>After you know your pulley size, you\u2019ll want to decide how much torque your motor needs to provide at a minimum. To do this, you\u2019ll need to calculate your desired rotor torque \u2013 and this is not always easy if you lack calculations from previous setups.<\/p>\n<p>If you have previous calculations, use them. If not, talk to OJ about the option of connecting a DRHX drive (must be large enough to drive the MRHX motor with certainty) and using OJ\u2019s DRHX PC Tool to make your selection.<\/p>\n<p>For a rough estimate of your required rotor torque, use the chart below.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-9065\" src=\"https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/required-rotor-torque-new-300x189.png\" alt=\"\" width=\"600\" height=\"379\" srcset=\"https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/required-rotor-torque-new-300x189.png 300w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/required-rotor-torque-new-1024x646.png 1024w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/required-rotor-torque-new-768x485.png 768w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/required-rotor-torque-new-1536x970.png 1536w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/09\/required-rotor-torque-new-2048x1293.png 2048w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>Once you have your required rotor torque, simply divide this by your actual speed ratio to calculate your minimum motor torque.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-9040 alignnone\" src=\"https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/08\/calculation-step5-300x140.png\" alt=\"\" width=\"400\" height=\"187\" srcset=\"https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/08\/calculation-step5-300x140.png 300w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/08\/calculation-step5-1024x479.png 1024w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/08\/calculation-step5-768x359.png 768w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/08\/calculation-step5-1536x718.png 1536w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2025\/08\/calculation-step5-2048x957.png 2048w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<h4>IMPORTANT!<\/h4>\n<p>Now you will need to add a margin \u2013 we recommend 25% \u2013 to the result to cover any torque variations you may experience. Then you\u2019ll be ready to choose the right OJ Electronics MRHX motor and DRHX drive.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7368 size-medium\" src=\"https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2023\/11\/mrhx-3200-4n-l-10cm-fritlagt-300x291.png\" alt=\"MRHX-3200 from OJ Electronics A\/S\" width=\"300\" height=\"291\" srcset=\"https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2023\/11\/mrhx-3200-4n-l-10cm-fritlagt-300x291.png 300w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2023\/11\/mrhx-3200-4n-l-10cm-fritlagt-1024x993.png 1024w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2023\/11\/mrhx-3200-4n-l-10cm-fritlagt-768x745.png 768w, https:\/\/ojelectronics.com\/drives\/wp-content\/uploads\/sites\/26\/2023\/11\/mrhx-3200-4n-l-10cm-fritlagt.png 1181w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>In our example, this means you will need a <strong>4 Nm motor<\/strong>.<\/p>\n<h3>Find out more about our <strong><a href=\"https:\/\/ojelectronics.com\/drives\/products\/oj-drhx-modbus-control\/\">DRHX drives<\/a><\/strong> and <a href=\"https:\/\/ojelectronics.com\/drives\/products\/oj-mrhx-stepper-motor\/\">MRHX motors<\/a>!<\/h3>\n","protected":false},"excerpt":{"rendered":"<p>Choosing the right pulley for your rotary heat exchanger can be trickier than you might think. It\u2019s not rocket science, but there are some calculations you\u2019ll need to make to get it right. This brief article takes you through the process, so you end up with the most cost-efficient setup possible.Pulley and Motor Size The &hellip;<\/p>\n","protected":false},"author":16,"featured_media":9015,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":"","footnotes":""},"categories":[264,11],"tags":[],"class_list":["post-8990","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-heat-recovery","category-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The Complete Guide to Choosing Rotary Heat Exchanger&#039;s Right Pulley and Motor Size - OJ Electronics<\/title>\n<meta name=\"description\" content=\"Learn to optimize your rotary heat exchanger by choosing the right pulley and motor size with our comprehensive guide. 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