{"id":3025,"date":"2019-01-31T21:51:53","date_gmt":"2019-01-31T21:51:53","guid":{"rendered":"https:\/\/www.bodine-electric.com\/blog\/?p=3025"},"modified":"2019-05-30T20:18:07","modified_gmt":"2019-05-30T20:18:07","slug":"safe-operating-area-soa-ratings-of-ac-inverter-duty-gearmotors-explained","status":"publish","type":"post","link":"https:\/\/www.bodine-electric.com\/blog\/safe-operating-area-soa-ratings-of-ac-inverter-duty-gearmotors-explained\/","title":{"rendered":"Safe Operating Area (SOA) Ratings of AC Inverter Duty Gearmotors Explained"},"content":{"rendered":"<h2 style=\"text-align: left;\"><strong>What is Safe Operating Torque and Speed?<\/strong><\/h2>\n<p><strong>We define SOA Torque<\/strong> as the maximum torque at which the motor still operates within Class F thermal limits, or as the maximum torque of a gearmotor when it is gear-strength limited. Continuous duty operation must be limited to the area below the SOA or gear-limited torque curves.<\/p>\n<p><a href=\"https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/Higher-SOA-Torque-Graph_01-31-19.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-3026 size-full\" src=\"https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/Higher-SOA-Torque-Graph_01-31-19.jpg\" alt=\"\" width=\"712\" height=\"655\" srcset=\"https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/Higher-SOA-Torque-Graph_01-31-19.jpg 712w, https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/Higher-SOA-Torque-Graph_01-31-19-300x276.jpg 300w\" sizes=\"auto, (max-width: 712px) 100vw, 712px\" \/><\/a><\/p>\n<p><strong>The SOA torque for synchronous motors<\/strong> is close to the pull-in torque; that is, the motor will pull out of synchronism if the required torque exceeds the SOA torque.<\/p>\n<h2>The Relationship Between SOA Torque and Speed<\/h2>\n<p><strong>The SOA speed<\/strong> of Bodine&#8217;s Pacesetter&#x2122; non-synchronous motors is <strong><em>below<\/em><\/strong> rated speed. For example, Bodine model 2295, a type 34R6BFPP motor has a rated torque of 148 oz-in. at a rated speed of 1700 rpm (60 Hz), but only a SOA speed of 1572 rpm (60 Hz) at 247 0z-in. SOA torque. Higher SOA torque is produced at the trade-off of motor speed. Starting currents may be different when the motors or gearmotors are operated with an inverter drive (VFD\/ASD). The SOA Graphs for Bodine Electric inverter duty, three-phase, AC induction motors and gearmotors were generated by performance-testing all standard models over the full rated speed\/frequency range. The SOA graphs provide the data needed to successfully apply these variable speed AC motors and gearmotors.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3032 size-full aligncenter\" src=\"https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019.jpg\" alt=\"\" width=\"707\" height=\"199\" srcset=\"https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019.jpg 707w, https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019-300x84.jpg 300w\" sizes=\"auto, (max-width: 707px) 100vw, 707px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3035\" src=\"https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019_1.jpg\" alt=\"\" width=\"1425\" height=\"582\" srcset=\"https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019_1.jpg 1425w, https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019_1-300x123.jpg 300w, https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019_1-768x314.jpg 768w, https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019_1-1024x418.jpg 1024w\" sizes=\"auto, (max-width: 1425px) 100vw, 1425px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3036\" src=\"https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019_2.jpg\" alt=\"\" width=\"1412\" height=\"521\" srcset=\"https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019_2.jpg 1412w, https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019_2-300x111.jpg 300w, https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019_2-768x283.jpg 768w, https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019_2-1024x378.jpg 1024w\" sizes=\"auto, (max-width: 1412px) 100vw, 1412px\" \/><\/p>\n<h2>Benefits<\/h2>\n<p>Inverter duty, three-phase gearmotors offer performance improvements over comparable single-phase units. When operated with and AC speed control (inverter), the motor or gearmotor speed can be easily matched to varying application loads. Pacesetter gearmotors and motors are more efficient than their single-phase counterparts, they are more compact, and provide higher output torques in the same size package. In addition, these variable-speed AC gearmotors and motors don&#8217;t require brush replacement or brush maintenance, and the gearheads are lubricated for life.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3038\" src=\"https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019_3.jpg\" alt=\"\" width=\"1446\" height=\"405\" srcset=\"https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019_3.jpg 1446w, https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019_3-300x84.jpg 300w, https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019_3-768x215.jpg 768w, https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/SOA-Blog_01-31-2019_3-1024x287.jpg 1024w\" sizes=\"auto, (max-width: 1446px) 100vw, 1446px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><strong>To download this blog article as a PDF, please <a href=\"https:\/\/www.bodine-electric.com\/blog\/wp-content\/uploads\/2019\/01\/BODINE-SOA-AC-Inverter-Duty-Gearmotors1.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"color: #800000;\">click here<\/span><\/a>.<\/strong><\/p>\n<p style=\"text-align: center;\">Copyright <a href=\"http:\/\/www.bodine-electric.com\" target=\"_blank\" rel=\"noopener noreferrer\">Bodine Electric Company<\/a> \u00a9 01\/2019. All rights reserved.<\/p>\n","protected":false},"excerpt":{"rendered":"What is Safe Operating Torque and Speed? We define SOA Torque as the maximum torque at which the motor still operates within Class F thermal limits, or as the maximum torque of a gearmotor when it is gear-strength limited. Continuous duty operation must be limited to the area below the SOA or gear-limited torque curves.<br \/><br \/><br \/><br \/><a class=\"view_link\" href=\"https:\/\/www.bodine-electric.com\/blog\/safe-operating-area-soa-ratings-of-ac-inverter-duty-gearmotors-explained\/\"> VIEW<\/a>","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,6,7],"tags":[13,14,15,21,34,35,36,40],"class_list":["post-3025","post","type-post","status-publish","format-standard","hentry","category-application-tips","category-engineering-talk","category-gearmotor-basics","tag-ac-gearmotor","tag-ac-gearmotors","tag-ac-induction-motors","tag-bodine-electric-company","tag-fractional-horsepower","tag-gearmotor","tag-gearmotors","tag-inverter-duty"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Safe Operating Area (SOA) Ratings of AC Inverter Duty Gearmotors Explained - Bodine - Gearmotor Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bodine-electric.com\/blog\/safe-operating-area-soa-ratings-of-ac-inverter-duty-gearmotors-explained\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Safe Operating Area (SOA) Ratings of AC Inverter Duty Gearmotors Explained - Bodine - Gearmotor Blog\" \/>\n<meta property=\"og:description\" content=\"What is Safe Operating Torque and Speed? We define SOA Torque as the maximum torque at which the motor still operates within Class F thermal limits, or as the maximum torque of a gearmotor when it is gear-strength limited. 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