Sector symmetry on a 1/5 3D electro motor

Hi All,

i have a 3D model that shows only 1/5 of whole motor. It has 3 phase and 5 pool pairs. i'm using rotary machinery modul 3D.

if i disabled all continuity BC on the outer slice surface, it converge. but it cant be right.

if continuity BC are used, it wont be converged.

there is also sector symmetry. on the documentation there only some sentences about it. if i'm not mistaken, i need to define "sector" = 5 because i have only 1/5 of it.
has any body deal with this BC?

thx and happy new year!
akmal