Looks good in theory.
Before you finalise the design, it may be of interest to look carefully at the spooner,wu and co report again, and consider the effects of the iron loss to the IxIxR problem.
Really the only possible benefit of this design is that the end loops are shorter, and this helps the IxIxR losses, but at the lower power range, it looks like the resistive losses are outweighed by the iron losses. (the eddy current losses referred to in their table refers to the edddy currents in the copper coil as I understand it, the iron losses are the eddycurrents in the donut). Therefore it is important to understand your iron eddy currents and their effect on you output at lower wind speeds.
If you are trying to harvest the lower winds, then there is nothing to be gained by this technically more difficult design, as the wire losses by the "normal Danb" system are going to be far smaller than the iron loss at lower power.
If your design is faster in rpm for a given power than the 200 rpm/5000W spooner one, then iron loss will become more of a problem... so give this some serious thought. It may well be that the best design you can come up with, may well only win at the higher end of the generating range, and that you are at a disadvantage at the normal wind speed range.
That being said, I like the idea that you are going ahead anyway, but give some thought to the structure. Rotornuts has pointed out a difficulty about holding the concentric loops together.... you can probably use looped flat silicon steel, and do what they seem to do with most universal motors and a lot of big transformers nowdays...run a bead of weld across the plates to physically hold them. I would have thought that this would negate the use of the plates in the first instance, but it seems to be common practice nowdays.
The other thing to ponder, is the use of a radial setup, this could allow you to use large motor laminates as the plane will change from vertical integration to horizontal...this lends itself to easy procurement (stolen from large three phase motor or the like), and also easy assembly. The two drums supporting the Mags could be assembled before the stator had to be put in between the two drums. This would alleviate the axial thrust problems referred to in Spooner.
Must go now to help a neighbour erect an African Wind Power mill on top of the nearby mountains.....can't wait...
But do think about the percieved gains, and how to minimise the losses in the steel.
.............oztules
