Learning Forum

[malhoss]

Hello. I am trying to do structural analysis of an outer rotor permanent magnet motor. I am considering the magnets are segmented and stacked one over another. I am watching unusually excessive high stress at a very small hotspot points which is not making sense. I am attaching the image below. Stress at other parts seems ok but there are 3 points in entire geometry where the the stress is very high. What can be the reason and how to resolve it?

 

[Akshay Singh]

Hi,

When you observe high stresses at specific points that do not seem to correlate with the expected physical behavior, it's important to consider the possibility of stress singularities or meshing issues.

You can compare averaged and unaveraged results at that location to check for any discrepancies.

Also, check the element quality metrics at that location and review the problematic elements and try to solve the analysis again with a refined mesh in the erroneous location.

[peteroznewman]

There are defects in the mesh that caused the stress spike.

I suggest you use Shared Topology on all the individual magnet bodies so that they share common corners and edges. This will ensure that there is only one node at the corner and you won't get defects in the mesh and so no stress spike.