Hi Dinges,
This will answer the above questions:
http://www.otherpower.com/images/scimages/5171/awp_1.htmlThis will give you a fair insight I think.
Dinges "W.r.t. conversions, this system could work without a rewind for a lower voltage, i.e. using stockwinding. Simply build a new rotor and transform to whatever voltage you desire (12, 24, 48, ...). Downside is, you now have to deal with both the iron losses of the machine and the transformer losses. But in a site that regularly yields 15-24 kWh/day, I'd accept those losses with glee."
Theory.... never mind the loss just put bigger blades to compensate and no problems.....
Practice.... problem with rewinds is that the pole number is usually small. This means bigger blades... lower freq, bigger tranny...... still do-able, but could get rather cumbersome transformers. However, still possible.
The beauty of the AWP is the 30 poles. low rpm, high voltage, high freq at these low rpms.
I'm sure you could add another foot to the prop and still have no freq problems.... (maybe furling problems and overunning etc, but no conversion problems)
The upside in transformer selection, is that while not very efficient at low freq, the power is low at this time as well. At cut in , only about 100w needs to flow through the tranny at low freq (25hz). As she gets more speed, the power increases and so to does the efficiency in the tranny as freq climbs to 80-90hz, so it all sort of dynamically matches itself.... if that makes sense.
With respect to drives...... thanks for your pdf, won't dilute this thread any further, but we should talk I think.
Maybe do a diary and ask for input from some smart folks here. think optoisolators and maybe 5 separate isolated (flyback with 6 output windings etc.) voltage sources for high side drives (3), low side drives, (1) and chip (1). for high current applications.
...........oztules