Hi Stephane,
Please note that the Ansys Q3D is a quasi-static solver and it does take the magnetic permeability of the material into account. There would be some issue in the simulation setup that is causing this effect. If you are new to Ansys Q3D then you can go through this video course for better understanding - Intro to Ansys Q3D | Ansys Innovation Course.
Kindly let us know your end goal and analysis that you want to do on a planar transformer so that we can serve in a better way.
Best regards,
Praneeth.
You are navigating away from the AIS Discovery experience