{"id":388774,"date":"2024-10-09T13:52:38","date_gmt":"2024-10-09T13:52:38","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/388774\/"},"modified":"2024-10-09T13:52:38","modified_gmt":"2024-10-09T13:52:38","slug":"388774","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/388774\/","title":{"rendered":"Reply To: Adhesion factor in MotorCAD Mechanical stress analysis"},"content":{"rendered":"<p>&lt;p&gt;Thanks for the question. The &#8216;adhesion factor&#8217; is applied as a scaling factor to the magnet&#8217;s Young&#8217;s modulus for the magnet. If the adhesion factor is set to a low value, the magnet effectively becomes a mass loading on the rotor, without adding a stiffening effect. Because of the glue layer, this is normally a reasonable approximation, so we&#8217;d normally recommend a low value for this adhesion factor. You can also study the sensitivity of the stress to this, I&#8217;d expect a low sensitivity once you reach a reasonably low value for the adhesion factor.&lt;\/p&gt;&lt;p&gt;One option to increase the fidelity of the calculation is to set the adhesion factor to 1.0, ensure that there is a small gap on both sides of the magnet (&#8216;Mag Gap Inner&#8217; and &#8216;Mag Gap Outer&#8217; both non-zero), and setting the material in the rotor pocket (in the tab &#8216;Input data-&gt;Materials&#8217;, Rotor Pocket) to represent the adhesive material (for example &#8216;Epoxy&#8217;). This allows the compliance of the glue layer to be modelled directly.&lt;\/p&gt;&lt;p&gt;In any case, it is good to make sure that there is a gap modelled on at least one side of the magnet, as otherwise the FEA solution will represent a condition where the magnet &#8216;glues&#8217; the two sides of the pocket together, giving an unrealistic increase in stiffness (because the Motor-CAD mechanical FEA solver is linear, gap opening effects are not included). I think from your comments, you are already doing this.&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-388774","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Thanks for the question. The &#039;adhesion factor&#039; is applied as a scaling factor to the magnet&#039;s Young&#039;s modulus for the magnet. If the adhesion factor is set to a low value, the magnet effectively becomes a mass loading on the rotor, without adding a stiffening effect. Because of the glue layer, this is normally a\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/388774\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: Adhesion factor in MotorCAD Mechanical stress analysis | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Thanks for the question. The &#039;adhesion factor&#039; is applied as a scaling factor to the magnet&#039;s Young&#039;s modulus for the magnet. If the adhesion factor is set to a low value, the magnet effectively becomes a mass loading on the rotor, without adding a stiffening effect. Because of the glue layer, this is normally a\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/388774\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-10-09T13:52:38+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-10-09T13:52:38+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Adhesion factor in MotorCAD Mechanical stress analysis | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Thanks for the question. The &#039;adhesion factor&#039; is applied as a scaling factor to the magnet&#039;s Young&#039;s modulus for the magnet. 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The 'adhesion factor' is applied as a scaling factor to the magnet's Young's modulus for the magnet. If the adhesion factor is set to a low value, the magnet effectively becomes a mass loading on the rotor, without adding a stiffening effect. 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The 'adhesion factor' is applied as a scaling factor to the magnet's Young's modulus for the magnet. If the adhesion factor is set to a low value, the magnet effectively becomes a mass loading on the rotor, without adding a stiffening effect. 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If the adhesion factor is set to a low value, the magnet effectively becomes a mass loading on the rotor, without adding a stiffening effect. Because of the glue layer, this is normally a","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/388774\/","article:published_time":"2024-10-09T13:52:38+00:00","article:modified_time":"2024-10-09T13:52:38+00:00","twitter:card":"summary_large_image","twitter:title":"Reply To: Adhesion factor in MotorCAD Mechanical stress analysis | Ansys Learning Forum","twitter:description":"Thanks for the question. The 'adhesion factor' is applied as a scaling factor to the magnet's Young's modulus for the magnet. If the adhesion factor is set to a low value, the magnet effectively becomes a mass loading on the rotor, without adding a stiffening effect. 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