{"id":453231,"date":"2026-02-25T06:18:30","date_gmt":"2026-02-25T06:18:30","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/meshing-transient-motor\/"},"modified":"2026-02-25T06:18:30","modified_gmt":"2026-02-25T06:18:30","slug":"meshing-transient-motor","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/meshing-transient-motor\/","title":{"rendered":"Meshing- Transient Motor"},"content":{"rendered":"<p>&lt;p&gt;Hi all, I&rsquo;m running a 3D Maxwell Transient simulation of an electrical motor (geometry is inherently 3D, so 2D is not an option). My model includes PMs + rotor steel, band (motion), outer\/inner regions, stator region ,stator steel, coils. My main issue is mesh quality \/ stability: I&rsquo;ve tried multiple meshes but I still see noise and extra harmonics in results (e.g., torque \/ back-EMF). I&rsquo;m not sure if this is expected physics\/numerics or if my meshing approach is wrong. Right now my &ldquo;quick&rdquo; approach is basically Length Based &rarr; Inside Selection applied to most parts with ~5 mm. What I&rsquo;m looking for (practical guidance): Mesh seeding strategy per part Where do you usually apply Length Based on faces vs inside volumes (PMs, rotor steel, stator teeth\/yoke, coils, regions)? Any advice on using surface approximation settings vs just length-based refinement? Meshing for rotating motion \/ band setup For motion, I understand the moving parts should be isolated with a band, and the re-meshed region is inside the band each timestep. What&rsquo;s the best practice for the band mesh operation and for stabilizing torque\/force results (to avoid mesh-driven noise)? Airgap modeling question (band + air regions) Do I need an explicit vacuum &ldquo;airgap volume&rdquo; object? In my geometry, the band sits in ~1\/3 of the airgap and the stator-side region is ~1\/3; the remaining ~1\/3 is currently just &ldquo;empty space&rdquo;. If I create an airgap volume it will touch\/overlap the band, so I left it. Is this a problem, and what&rsquo;s the recommended way to partition the airgap volumes around the band? If helpful, I can share screenshots of the band\/airgap layout + current mesh settings.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-453231","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27789"],"_bbp_topic_id":["453231"],"_bbp_subscription":["272570","82626"],"_bbp_author_ip":["193.28.36.80"],"_bbp_last_reply_id":["454988"],"_bbp_last_active_id":["454988"],"_bbp_last_active_time":["2026-03-23 07:14:22"],"_bbp_reply_count":["2"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["272570","82626"],"_btv_view_count":["203"],"_bbp_topic_status":["unanswered"]},"test":"f46b547cd1d39ad44b7cca20b9fd7c0dcbf4f435"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/453231","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\/453231\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=453231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}