{"id":1611,"date":"2020-06-04T13:02:51","date_gmt":"2020-06-04T13:02:51","guid":{"rendered":"http:\/\/localhost\/network\/test\/projects\/control-of-asymmetries-in-permanent-magnet-electrical-machines\/"},"modified":"2020-06-16T14:04:05","modified_gmt":"2020-06-16T13:04:05","slug":"control-of-asymmetries-in-permanent-magnet-electrical-machines","status":"publish","type":"page","link":"https:\/\/hub.salford.ac.uk\/sirc-engineering\/projects\/control-of-asymmetries-in-permanent-magnet-electrical-machines\/","title":{"rendered":"Control of asymmetries in permanent magnet electrical machines"},"content":{"rendered":"\n<p><strong>PhD project. Supervisor \u2013 Professor T X Mei<\/strong><\/p>\n\n\n\n<p>It is usually assumed that manufactured 3-phase rotary machines have symmetrical windings. However, because of tolerances in the manufacturing process, the asymmetries between phases may occur. The causes of phase asymmetries can be of mechanical or electromagnetic nature. Furthermore, linear machines&nbsp;&nbsp;with more than 2 phases have inherent asymmetries of phases, which are associated with increased reluctances of the flux paths at the ends of magnetic core.<\/p>\n\n\n\n<p>The dynamic analysis of 3-phase machines is usually carried out using the d-q model which assumes that the machine parameters (inductances) of different phases are symmetrical and almost all latest control systems are developed based on the assumption which can lead to significant torque ripples in&nbsp;&nbsp;the machines with substantial asymmetry properties.<\/p>\n\n\n\n<p>The main objectives of the project include: to develop appropriate modelling methods that take into account of the asymmetries in the electrical machines; to emulate the asymmetrical conditions with a standard permanent magnet motor to \u2018re-create\u2019 the torque ripples with the conventional&nbsp;&nbsp;control method; and to develop practical solutions for improved control performance.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PhD project. Supervisor \u2013 Professor T X Mei It is usually assumed that manufactured 3-phase rotary machines have symmetrical windings. However, because of tolerances in the manufacturing process, the asymmetries between phases may occur. The causes of phase asymmetries can be of mechanical or electromagnetic nature. Furthermore, linear machines&nbsp;&nbsp;with more than 2 phases have inherent [&hellip;]<\/p>\n","protected":false},"author":184,"featured_media":0,"parent":1608,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-1611","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Control of asymmetries in permanent magnet electrical machines | Engineering | University of Salford<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/hub.salford.ac.uk\/sirc-engineering\/projects\/control-of-asymmetries-in-permanent-magnet-electrical-machines\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Control of asymmetries in permanent magnet electrical machines | Engineering | University of Salford\" \/>\n<meta property=\"og:description\" content=\"PhD project. Supervisor \u2013 Professor T X Mei It is usually assumed that manufactured 3-phase rotary machines have symmetrical windings. However, because of tolerances in the manufacturing process, the asymmetries between phases may occur. The causes of phase asymmetries can be of mechanical or electromagnetic nature. Furthermore, linear machines&nbsp;&nbsp;with more than 2 phases have inherent [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"http:\/\/hub.salford.ac.uk\/sirc-engineering\/projects\/control-of-asymmetries-in-permanent-magnet-electrical-machines\/\" \/>\n<meta property=\"og:site_name\" content=\"Engineering\" \/>\n<meta property=\"article:modified_time\" content=\"2020-06-16T13:04:05+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"http:\\\/\\\/hub.salford.ac.uk\\\/sirc-engineering\\\/projects\\\/control-of-asymmetries-in-permanent-magnet-electrical-machines\\\/\",\"url\":\"http:\\\/\\\/hub.salford.ac.uk\\\/sirc-engineering\\\/projects\\\/control-of-asymmetries-in-permanent-magnet-electrical-machines\\\/\",\"name\":\"Control of asymmetries in permanent magnet electrical machines | Engineering | University of Salford\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/hub.salford.ac.uk\\\/sirc-engineering\\\/#website\"},\"datePublished\":\"2020-06-04T13:02:51+00:00\",\"dateModified\":\"2020-06-16T13:04:05+00:00\",\"breadcrumb\":{\"@id\":\"http:\\\/\\\/hub.salford.ac.uk\\\/sirc-engineering\\\/projects\\\/control-of-asymmetries-in-permanent-magnet-electrical-machines\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"http:\\\/\\\/hub.salford.ac.uk\\\/sirc-engineering\\\/projects\\\/control-of-asymmetries-in-permanent-magnet-electrical-machines\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"http:\\\/\\\/hub.salford.ac.uk\\\/sirc-engineering\\\/projects\\\/control-of-asymmetries-in-permanent-magnet-electrical-machines\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Projects\",\"item\":\"https:\\\/\\\/hub.salford.ac.uk\\\/sirc-engineering\\\/projects\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Control of asymmetries in permanent magnet electrical machines\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/hub.salford.ac.uk\\\/sirc-engineering\\\/#website\",\"url\":\"https:\\\/\\\/hub.salford.ac.uk\\\/sirc-engineering\\\/\",\"name\":\"Engineering\",\"description\":\"Salford Innovation Research Centre (SIRC)\",\"publisher\":{\"@id\":\"https:\\\/\\\/hub.salford.ac.uk\\\/sirc-engineering\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/hub.salford.ac.uk\\\/sirc-engineering\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/hub.salford.ac.uk\\\/sirc-engineering\\\/#organization\",\"name\":\"Engineering\",\"url\":\"https:\\\/\\\/hub.salford.ac.uk\\\/sirc-engineering\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/hub.salford.ac.uk\\\/sirc-engineering\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/hub.salford.ac.uk\\\/sirc-engineering\\\/wp-content\\\/uploads\\\/sites\\\/160\\\/2025\\\/02\\\/university-salford-logo-400x250-1.png\",\"contentUrl\":\"https:\\\/\\\/hub.salford.ac.uk\\\/sirc-engineering\\\/wp-content\\\/uploads\\\/sites\\\/160\\\/2025\\\/02\\\/university-salford-logo-400x250-1.png\",\"width\":400,\"height\":250,\"caption\":\"Engineering\"},\"image\":{\"@id\":\"https:\\\/\\\/hub.salford.ac.uk\\\/sirc-engineering\\\/#\\\/schema\\\/logo\\\/image\\\/\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Control of asymmetries in permanent magnet electrical machines | Engineering | University of Salford","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"http:\/\/hub.salford.ac.uk\/sirc-engineering\/projects\/control-of-asymmetries-in-permanent-magnet-electrical-machines\/","og_locale":"en_US","og_type":"article","og_title":"Control of asymmetries in permanent magnet electrical machines | Engineering | University of Salford","og_description":"PhD project. Supervisor \u2013 Professor T X Mei It is usually assumed that manufactured 3-phase rotary machines have symmetrical windings. However, because of tolerances in the manufacturing process, the asymmetries between phases may occur. The causes of phase asymmetries can be of mechanical or electromagnetic nature. 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