Hello Angel,
In the Ansys Electronics Desktop Student Version | Free Software Download you can find the Mesh element count limit under Product restrictions (see image below).
If you want to reduce the number of mesh elements in your models I would suggest:
1. 1. Model only the minimum periodic symmetry (for example 1/8 of the machine)
2. 2. Specify the surface approximation in the Maxwell 2D/ Mesh/ Initial mesh settings.
I hope this helps you. Ivonne
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