@professor_shartsis please use some annotated figures to explain your case, otherwise whatever you write on this forum will generally be ignored.
I didn’t go into the details discussed above, but if the stator is directly mounted on the axle, then axial stresses beyond what the material is able to handle will lead to failure. And like @dani said, the torque doesn’t matter but the stress. If you use a larger dia axle, the stresses go down.
In case of direct drive( I am talking about eLofty) the stator applies torque on the 14 mm square shaft at the very back using a square hole.
