Normally with a dual-rotor axial the alternator has to be jacked apart to remove the stator.
With the stock designs, this means the turbine has to come down. It is may not be an issue with a small, say 10'ter, but with a heavier machine it is IMO. Ours is a 4.6m (15’) diameter rotor and it weighs about 180 kg (400#).
With a removable stator the rotors can be mounted to the hub, magnets gapped, and the magnet rotor/hub assy. positioned on the spindle; then the stator goes in. During disassembly, the blades are removed, then the stator. The remainder of the alternator, being the magnet rotors and hub can be lower to the ground leaving the yaw assembly, tail-boom, hinge, vane all up top.
The motivation is to have better serviceability, perhaps better cooling, longevity etc. And I suppose, if you had a serious rub, or were to repeat the design the stator can be replicated in whole, or parts using the same mold.
There also are no electrical connections that are imbedded in the stator, as with most cast designs.
I think if I were to do it again, I might consider reducing it to maybe three or four sections.
Best, ~ks
