{"article":{"id":360000350014,"url":"https://maxonmotor.zendesk.com/api/v2/help_center/en-us/articles/360000350014.json","html_url":"https://support.maxongroup.com/hc/en-us/articles/360000350014-Continuous-operation-range-of-BLDC-EC-Motors","author_id":363224517894,"comments_disabled":true,"draft":false,"promoted":false,"position":4,"vote_sum":0,"vote_count":0,"upvote_count":0,"downvote_count":0,"section_id":360000877134,"created_at":"2018-01-25T12:58:35Z","updated_at":"2024-08-29T11:48:57Z","name":"Continuous operation range of BLDC (EC) Motors","title":"Continuous operation range of BLDC (EC) Motors","source_locale":"en-us","locale":"en-us","outdated":false,"outdated_locales":[],"edited_at":"2022-07-20T09:43:23Z","user_segment_id":null,"permission_group_id":247893,"content_tag_ids":[],"label_names":["motor","EC","BLDC","Dauerbetriebsbereich","Eisenverluste","Stromwärmeverluste","continuous operation range","Joule","power losses","iron","eddy current","losses","Verluste"],"body":"<h2>Topic:</h2>\n<ul>\n<li>Why is the border line of the continuous operation range of EC motors curved?</li>\n</ul>\n<h2>Technical Background &amp; Solution:</h2>\n<h3>Border continuous operation range </h3>\n<p>The border of the continuous operation range is given by</p>\n<ul>\n<li>the maximum winding temperature of 125°C</li>\n<li>and the ability of the motor to dissipate the produced heat.</li>\n</ul>\n<p>The winding of EC motors is heated up</p>\n<ul>\n<li>directly by <strong>Joule power losses</strong> (electrical resistance)</li>\n<li>indirectly by the speed dependent <strong>iron power losses</strong> in the magnetic return (hysteresis and eddy current losses).</li>\n</ul>\n<p>The <strong>eddy current losses</strong> increase with the square of the speed. At high speeds considerable heat is produced simply by the rotating magnet. Therefore, only a small amount of current can flow without overheating the motor.</p>\n<p>At <strong>higher speeds</strong> a <strong>smaller output torque</strong> is available.</p>\n<p><img src=\"https://support.maxongroup.com/hc/article_attachments/360007809693/OperatingRangeLossesEC-EN.jpg\" alt=\"OperatingRangeLossesEC-EN.jpg\" width=\"679\" height=\"349\"></p>"}}