{"id":398186,"date":"2024-12-21T20:43:52","date_gmt":"2024-12-21T20:43:52","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/alnico-hysteresis-simulation\/"},"modified":"2024-12-21T20:43:52","modified_gmt":"2024-12-21T20:43:52","slug":"alnico-hysteresis-simulation","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/alnico-hysteresis-simulation\/","title":{"rendered":"AlNiCo hysteresis simulation"},"content":{"rendered":"<p>&lt;p&gt;I know this question has been asked many times, but sadly none of the previous discussions I encountered appear to contain a definitive answer on how to make this work.&lt;\/p&gt;&lt;p&gt;I have a very basic Maxwell 3D transient simulation setup with a cylindrical magnet and a coil wound around it. I apply a current pulse through the coil, which causes a strong magnetic field to be induced inside the magnet for a few microseconds. The field is sufficiently strong to reverse the magnetization of the cylinder. After the current is removed, I expect the cylinder to reverse its magnetization; however, it just returns to its original state. The behavior of this simple simulation setup does not match the behavior of an actual prototype I assembled on the bench; the reason the prototype was built is to validate the correctness of Maxwell predictions but right now it is failing that.&lt;\/p&gt;&lt;p&gt;The cylinder is made of LNG37 and the same material is selected in the simulation, taken from the RMxpert library; the material definition includes the correct BH curve spanning the first two quadrants, which should be sufficient to simulate the hysteresis effect according to what I read in the help and here on the forum.&lt;\/p&gt;&lt;p&gt;Below are the plots of the solenoid current over time and the magnetic flux magnitude; the magnitude starts from 50 mT and goes back to that as expected, but what is unexpected is that the original magnetization direction is restored.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/21-12-2024-1734813671-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;Can you please share any pointers what is it that I am doing wrong? Thanks!&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-398186","topic","type-topic","status-publish","hentry","topic-tag-ansys-maxwell","topic-tag-ansys-maxwell-3d","topic-tag-ansysmaxwelltransient","topic-tag-bh-curve-1","topic-tag-demagnetization","topic-tag-magnetization-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27793"],"_bbp_topic_id":["398186"],"_bbp_subscription":["492515","602"],"_bbp_author_ip":["195.50.210.145"],"_bbp_last_reply_id":["403446"],"_bbp_last_active_id":["403446"],"_bbp_last_active_time":["2025-01-03 18:51:18"],"_bbp_reply_count":["9"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["492515","602"],"_btv_view_count":["494"],"_bbp_topic_status":["unanswered"]},"test":"pavel-kirienkozubax-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/398186","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\/398186\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=398186"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}