{"id":407368,"date":"2025-01-28T10:30:05","date_gmt":"2025-01-28T10:30:05","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ansys-maxwell-transient-simulation-stationary-shell\/"},"modified":"2025-01-28T10:30:05","modified_gmt":"2025-01-28T10:30:05","slug":"ansys-maxwell-transient-simulation-stationary-shell","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ansys-maxwell-transient-simulation-stationary-shell\/","title":{"rendered":"Ansys Maxwell Transient Simulation Stationary Shell"},"content":{"rendered":"<p>&lt;p&gt;Hi,&lt;\/p&gt;&lt;h4&gt;<strong>Issue Summary:<\/strong>&lt;\/h4&gt;&lt;p&gt;I am trying to <strong>move ring-shaped permanent magnets (PM) and a ring-shaped weight<\/strong> up the shaft of a tube that contains an <strong>Iron Core on the inside<\/strong>. However, when I validate my simulation, I receive the following errors:&lt;\/p&gt;<\/p>\n<ul>\n<li><strong>&#8220;Moving objects touch the stationary shell.&#8221;<\/strong><\/li>\n<li><strong>&#8220;Motion setup (geometry) is not valid.&#8221;<\/strong><\/li>\n<\/ul>\n<p>&lt;p&gt;I would appreciate any guidance on how to resolve these issues.&lt;\/p&gt;&lt;h4&gt;<strong>Simulation Setup:<\/strong>&lt;\/h4&gt;<\/p>\n<ul>\n<li>&lt;p&gt;<strong>Moving Objects:<\/strong>&lt;\/p&gt;\n<ul>\n<li>A <strong>ring-shaped permanent magnet (PM)<\/strong> and a <strong>ring-shaped weight<\/strong>.<\/li>\n<li>These objects need to move <strong>upwards along the shaft<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<li>&lt;p&gt;<strong>Transient Motion Band (TransBand):<\/strong>&lt;\/p&gt;\n<ul>\n<li><strong>Outer radius:<\/strong> 1 mm larger than the PM and weight.<\/li>\n<li><strong>Inner radius:<\/strong> 1 mm smaller than the PM and weight.<\/li>\n<li>The TransBand fully encloses both the PM and the weight.<\/li>\n<\/ul>\n<\/li>\n<li>&lt;p&gt;<strong>Surrounding Components:<\/strong>&lt;\/p&gt;\n<ul>\n<li><strong>Iron Core<\/strong> inside the shaft. Not involved in motion and Ansys acknowledges this.<\/li>\n<li><strong>PVC Plastic Pipe<\/strong> surrounding the TransBand (with a 2 mm larger radius than the TransBand). Not involved in motion and Ansys acknowledges this.<\/li>\n<\/ul>\n<\/li>\n<li>&lt;p&gt;<strong>Subtraction Operation:<\/strong>&lt;\/p&gt;\n<ul>\n<li>The <strong>PM and weight are subtracted along the entire height of the shaft<\/strong>, ensuring they maintain their ring shape throughout their motion. I did a version where the subtraction was the same height as the outside radius and got the same error messages<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&lt;h4&gt;<strong>Observed Errors &amp; Debugging Attempts:<\/strong>&lt;\/h4&gt;<\/p>\n<ul>\n<li><strong>Checked that the PM and weight fit entirely within the TransBand.<\/strong><\/li>\n<li><strong>Ensured there is a gap between moving objects and the stationary shell.<\/strong><\/li>\n<li><strong>Verified motion setup settings in the Design List.<\/strong><\/li>\n<\/ul>\n<p>&lt;p&gt;However, I still receive errors when validating.&lt;\/p&gt;&lt;hr&gt;&lt;h3&gt;<strong>Questions:<\/strong>&lt;\/h3&gt;<\/p>\n<ol>\n<li>&lt;p&gt;<strong>What does &#8220;Moving objects touch the stationary shell&#8221; mean in this case?<\/strong>&lt;\/p&gt;\n<ul>\n<li>Could this mean my TransBand is incorrectly defined?<\/li>\n<li>Do I need a larger air gap between the TransBand and moving objects?<\/li>\n<\/ul>\n<\/li>\n<li>&lt;p&gt;<strong>Why is the &#8220;Motion setup (geometry) is not valid&#8221;?<\/strong>&lt;\/p&gt;\n<ul>\n<li>Should the transient band be adjusted differently?<\/li>\n<li>Is there a specific constraint on how motion bands should be created for ring-shaped moving objects?<\/li>\n<\/ul>\n<\/li>\n<li>&lt;p&gt;<strong>Are there specific best practices for defining motion bands for non-solid moving objects (like rings)?<\/strong>&lt;\/p&gt;<\/li>\n<\/ol>\n<p>&lt;p&gt;Any advice or troubleshooting steps would be greatly appreciated.&lt;\/p&gt;&lt;p&gt;Thanks in advance for your help!&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/28-01-2025-1738059514-mceclip0.png\" \/>&lt;br&gt;&lt;br&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/28-01-2025-1738059584-mceclip1.png\" \/>&lt;br&gt;&lt;br&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/28-01-2025-1738059915-mceclip2.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-407368","topic","type-topic","status-publish","hentry","topic-tag-AnsysMaxwellelectronics-1","topic-tag-ansysmaxwelltransient","topic-tag-electromagnetics-suite-1","topic-tag-magnet","topic-tag-magnetic-transient","topic-tag-maxwell-3d-transient","topic-tag-motion-band-1","topic-tag-motion-setup-1","topic-tag-transient"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27793"],"_bbp_topic_id":["407368"],"_bbp_subscription":["503006","602"],"_bbp_author_ip":["140.203.214.112"],"_bbp_last_reply_id":["407594"],"_bbp_last_active_id":["407594"],"_bbp_last_active_time":["2025-01-29 14:49:17"],"_bbp_reply_count":["8"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["503006","602"],"_btv_view_count":["613"],"_bbp_topic_status":["unanswered"],"_bbp_likes_count":["1"]},"test":"j-murphy104universityofgalway-ie"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/407368","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\/407368\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=407368"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}