It's easier to just show you the pictures than to try to explain it. The stator is glued to a piece of plastic. The stator is perhaps powder coated. So, it's insulated. When put together the different thicknesses of spacer and stator makes the air gap of around 0.4 mm. There is about 1 mm of spacing between the outer diameter of the stator and inner diameter of the spacer.
9/20/14 at 9:15am