Learning Forum

[hikim]

Hello,

I am currently testing a couple of things to run a harmonic analysis on an electric motor.

I imported all the harmonic force data from Maxwell into Mechanical, and below picture shows the applied loads in mechanical.

There are remote forces and moments, and to my understanding the imported remote forces are the resultant forces of radial and tangential components of electromagnetic forces.

This might be a dumb question, but what I don't understand is that why moments are applied to each stator tooth tip. My coworker is using Altair, and it seems that Altair only lets you export the resultant forces, not moments.

 

I looked it up online and in mechanical and maxwell ansys help as well, but I couldn't find anything that explains why these moments are needed or how they are calculated.

To me, it looks like the moments are applied about the center of each stator tip's surface, and it might be the case that ansys is trying to simulate the moment caused by force unbalance within the nodes of one stator tip?

Any help would be greatly appreciated.

[ErKo]

 

Hi

So say instead of object based hamronic force from Maxwell -> Mech., we used Element based (Surface).

That will result in some different forces over the 'tooth' face and the nodes there (it will not be a constant force only, the force will be changing along the surface of the tooth).

So if we would like to convert that to an object based force (remote force and moment), that would need to result in both a force and a moment in order to be equivlent to the element based surface distribution (just converting one to another needs that – just force would not be enough it will have to be both force and moment for a surface force distr.).

All the best

Erik

 

[hikim]

Thank you so much for the clarification!

Are there any references in ansys help that explains how Ansys calculates these remote moments? Or maybe a powerpoint file Ansys provides?