{"id":238371,"date":"2022-10-21T15:40:51","date_gmt":"2022-10-21T15:40:51","guid":{"rendered":"\/forum\/forums\/topic\/current-shape-distorted-for-bldc-motor\/"},"modified":"2022-10-21T16:09:47","modified_gmt":"2022-10-21T16:09:47","slug":"current-shape-distorted-for-bldc-motor","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/current-shape-distorted-for-bldc-motor\/","title":{"rendered":"Current shape distorted for BLDC motor"},"content":{"rendered":"<p>I am trying to design a BLDC motor (Fig1) where the three phase windings are being excited by external circuit (fig 2). I am considering six step commutation process where I am specifying the commutation points based on back emf curve like that of fig 3. However I am getting a slight distorted current shape for stack length 52.85 mm (fig4) wherease I am getting a good current shape for stack length 51.5 mm (fig 5). I updated the phase resistance values for each case pror simulation. What can I do to get a good current shape like fig 5 for the case of stack length 52.85 mm (fig 4) ? If anyone has faced such issues please share your insight and solution if possible.<\/p>\n<p><a class=\"wp-colorbox-image cboxElement\" href=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/10\/21-10-2022-1666366594-mceclip0.png\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/10\/21-10-2022-1666366594-mceclip0.png\" width=\"192\" height=\"190\"><\/a> &nbsp; &nbsp;<\/p>\n<p>fig 1 : BLDC 2D FE model<a class=\"wp-colorbox-image cboxElement\" href=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/10\/21-10-2022-1666366657-mceclip2.png\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/10\/21-10-2022-1666366657-mceclip2.png\"><\/a><\/p>\n<p>fig 2 : External Circuit<\/p>\n<p><a class=\"wp-colorbox-image cboxElement\" href=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/10\/21-10-2022-1666366697-mceclip3.png\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/10\/21-10-2022-1666366697-mceclip3.png\" width=\"721\" height=\"382\"><\/a><\/p>\n<p>fig 3: Back Emf Curve<\/p>\n<p><a class=\"wp-colorbox-image cboxElement\" href=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/10\/21-10-2022-1666366740-mceclip4.png\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/10\/21-10-2022-1666366740-mceclip4.png\" width=\"1040\" height=\"288\"><\/a>FFig 4: Distorted Current Shape and Fig 5 : Desired Current shape<\/p>\n","protected":false},"template":"","class_list":["post-238371","topic","type-topic","status-closed","hentry","topic-tag-AnsysMaxwellelectronics-1","topic-tag-bldc-motor","topic-tag-commutation","topic-tag-maxwell","topic-tag-maxwell-circuit"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["255997","94"],"_bbp_author_ip":["23.48.209.109"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["576"],"_edit_lock":["1666368562:181947"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["238371"],"_bbp_forum_id":["27793"],"_bbp_engagement":["94","255997"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["283193"],"_bbp_last_active_id":["283193"],"_bbp_last_active_time":["2023-05-10 06:23:13"]},"test":"junaed-buetgmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/238371","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/238371\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=238371"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}