magnetic forces direction in post-processing

Hi all,

I have made a 2D simulation for the stress distribution due to magnetic forces in a synchronous reluctant machine, I want to show how the forces act on the boundaries of the stator teeth and the rotor outer diameter. I try to use the arrow and first principle stress but the stress and force arrows were distributed randomly around the domains of the machine parts.
Please, does any one have any idea that can help. thanks in advance.

Daniel