The series parallel thing. I think that's a mistake if you mean the heaters are the same, but I don't know.
IE: it would only be 4 steps.
If each heater is 10 ohms, the resistance would go 50, 8, 4.3, 2.86, then 2 ohms.
Pretty large jumps?
The 6 heaters and 2 each of star and delta thing would have the steps a bit more reasonable?
Switching 6 heaters between 4 configurations isn't a problem. Just a few relays and a logic circuit.
Probably need a cut-off circuit so there is no load until at least 6MPH, and (if it was me) more like 8MPH.
The switching speed (RPM?) would need some play. Unloaded at 6MPH may be faster than loaded at 6MPH. If you know what I mean. Sorry if thats mostly pertenint to HAWTs, but my VAWTs never work much.
If the PMA had 12 wires out, then it would allow 4 voltages.
If one "coil" made 10V, the choices would be 10V, 17V, 20V, and 34V.
The available power would be the same, but the available power, voltage and resistance could be tweaked to match.
Might even be helpful if sometimes the sine wave was only half wave rectified.
That would bring the effective voltage coult up to 8.
For 30 combinations. Yea, I think it's 30 instead of 32. Didn't think it through. Kind of in a rush right now.
The PWM Stamp or Picaxe thing could fix some of the issues. Gizmo Glenn's site might have something related.
Seems like "low frequency", 500Hz to 5KHz?, could fix most of the issues, if someone (not me) understood those chips. And wind and TSR and loads and power available and PMA efficiency.
Myself?
I'll be happy with the 12V 10W my kind of fly-able thing dumps,
Smile,
Pay my gas bill,
And be happy the insulation is good.
With luck, someone posted something better that this while I was 1 fingered typing.
G-