{"id":436312,"date":"2025-07-08T15:39:59","date_gmt":"2025-07-08T15:39:59","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-simulate-losses-in-permanent-magnets-and-iron\/"},"modified":"2025-07-08T15:39:59","modified_gmt":"2025-07-08T15:39:59","slug":"how-to-simulate-losses-in-permanent-magnets-and-iron","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-simulate-losses-in-permanent-magnets-and-iron\/","title":{"rendered":"How to simulate losses in Permanent Magnets and Iron?"},"content":{"rendered":"<p>&lt;p data-start=&#8221;207&#8243; data-end=&#8221;581&#8243;&gt;In a transient 2D simulation involving permanent magnets and ferromagnetic cores in Ansys Maxwell, the common recommendation is to assign &lt;strong data-start=&#8221;345&#8243; data-end=&#8221;364&#8243;&gt;0 mA of current<\/strong> to the magnets and enable &lt;strong data-start=&#8221;391&#8243; data-end=&#8221;414&#8243;&gt;Eddy Current Losses<\/strong> in the &lt;em data-start=&#8221;422&#8243; data-end=&#8221;435&#8243;&gt;Excitations<\/em> section. Additionally, &lt;strong data-start=&#8221;459&#8243; data-end=&#8221;474&#8243;&gt;Core Losses<\/strong> should be activated when the core material includes loss data, allowing proper post-processing of results.&lt;\/p&gt;&lt;p data-start=&#8221;586&#8243; data-end=&#8221;931&#8243;&gt;However, I noticed that the &lt;strong data-start=&#8221;614&#8243; data-end=&#8221;644&#8243;&gt;loss curves obtained in 2D<\/strong>&mdash;with this configuration&mdash;are &lt;strong data-start=&#8221;673&#8243; data-end=&#8221;700&#8243;&gt;significantly different<\/strong> from those obtained in a &lt;strong data-start=&#8221;726&#8243; data-end=&#8221;753&#8243;&gt;3D transient simulation<\/strong>, even when following the same setup logic. In 3D simulations, it is &lt;strong data-start=&#8221;822&#8243; data-end=&#8221;858&#8243;&gt;not necessary to apply 0 current<\/strong> to the magnets, and doing so doesn&#8217;t affect the outcome in the same way.&lt;\/p&gt;&lt;p data-start=&#8221;936&#8243; data-end=&#8221;1026&#8243;&gt;\u2753 Why is this 0-current setup critical for 2D transient simulations but not for 3D ones?&lt;br&gt;Why the Eddy Current loss curve is completly different between 2D and 3D analysis?&nbsp;&lt;\/p&gt;&lt;p data-start=&#8221;1032&#8243; data-end=&#8221;1269&#8243;&gt;Also worth noting: in my case, &lt;strong data-start=&#8221;1063&#8243; data-end=&#8221;1120&#8243;&gt;Eddy Current Losses were only enabled for the magnets<\/strong>, not for the core material, which might lead to confusion when interpreting results&mdash;although core losses are indeed accounted for in the simulation.&lt;\/p&gt;&lt;p data-start=&#8221;1274&#8243; data-end=&#8221;1398&#8243;&gt;Any clarification on this discrepancy between 2D and 3D handling of losses in permanent magnets would be highly appreciated.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-436312","topic","type-topic","status-publish","hentry","topic-tag-AnsysMaxwellelectronics-1","topic-tag-3d-maxwell-simulation","topic-tag-ansys-electronic-1","topic-tag-ansys-maxwell-2d","topic-tag-consumer-electronics-communication","topic-tag-core-loss","topic-tag-coreloss-2","topic-tag-eddyloss-1","topic-tag-eddy-losses-1","topic-tag-electric-machines","topic-tag-electromagnetics","topic-tag-magnetic-b-h-curves-2","topic-tag-magnetic-transient-solver-2","topic-tag-motor-losses","topic-tag-permanent-magnet"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27793"],"_bbp_topic_id":["436312"],"_bbp_subscription":["525967","2400"],"_bbp_author_ip":["150.162.29.100"],"_bbp_last_reply_id":["436423"],"_bbp_last_active_id":["436423"],"_bbp_last_active_time":["2025-07-09 17:26:08"],"_bbp_reply_count":["2"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["525967","2400"],"_btv_view_count":["296"],"_bbp_topic_status":["unanswered"]},"test":"f733b6f7e8a3ba06162134e8d6163fcc998a4f0a"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/436312","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\/436312\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=436312"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}