hmmmm.
Your graph seems to be saying stall stall stall. You mention that you have upped the coil count by a factor of 10, so stall is inevitable if you clamp it to 12v.
You have several possibilities .
1. a 5 phase transformer to act as a impedance matching device (like the AWP in my diaries). You can use your rpm counter to switch in the tranny when you feel your up to your cut in if you want to use a pic.... use it to turn on 4 triacs or solid state relays to connect the ac phases to the transformer (the fifth phase can be left hooked to the transformer) This will allow you to use your high voltage to charge batteries........messy but would work and fairly simple.
2. use a buck converter to bring your 5 phase rectified power down to your 12v level. I'd use a analogue type but I assume you will use a pic for this. I have not built a buch in the power range you may require
3. Use a full blown push pull pwm to control the output. JW mentions in a previous post to you in your diary that you need a constant stable dc source for the pwm. This is not so. The one in my gallery http://www.anotherpower.com/gallery/album52 is multi kilowatt device, and steps 240vac rectified but not filtered (8uf only to keep the voltage alive during crossover at 0v) down to 50A@36v for traction pack battery charging.
It is analogue push pull design by Stanbury Scarfe in NZ. It tracks the output only, and drives the pulse width very hard when the waveform drops, and lightly when the waveform is at peak (relatively). This means no electro caps to fail, and the power factor is considerably better as almost full use of the sinewave is achieved, rather than only using the peaks of the waves and ignoring the rest (below capacitor level).
4. a very large resistor in the line and bugger all output.... but at least you could watch the blades run away from stall.... Of course you would need a decent brake to stop them disappearing over the horizon when the wind built up.....
5. The best choice.....simply build a new stator with a realistic no of turns to best match your prop. All the other choices provide answers of a kind, but none as simple and bulletproof as No.5..... go with the flow. There is a reason why people wind 12v stators....... to drive 12v loads.
I cant help but feel some wire and glass work is in order here.
Also when your designing your rpm counter using the ac waveform, test it under load, with the rectifier working. It sends out no noise until it starts conducting, but when it does, it's bloody noisy...and it gets worse as the power goes up. Flux offers useful information about noise filtering techniques.
.......comfortably numb
oztules
