Would like to outline some important observed facts (data collected) relating to F&P stators output power potential.
As can be seen in the photo posted earlier I mainly use a Ozito HDR-5000 drill which produces up to 1200 W shaft power to drive my stators in test mode. There is some information missing from the published raw data.
Test 1: The maximum output power from any stator I've tested was 1032 W gained in direct drive mode with the drill at 912 RPM. Lets brake that down into some unpublished numbers. The input shaft power was 1200 W going into the stator. When we calculate the efficiency of the stator power transfer it comes out to 86 % which is pretty good.
Test 2: Adding a capacitor doubler to another stator (different configuration) tested in the lower gear on the drill (3 to 1 ratio) so 1200 RPM becomes 400 RPM on the shaft. The maximum output I reached was 710 W at 400 RPM. That is with the same 1200 W maximum input power. We are now down to only 59 % power transfer.
Test 3: Adding what I call "power factor correction capacitors" running a test again as above in lower gear on the drill I get 950 W peak at 395 RPM. With the same 1200 W maximum input power, we are now back up to 79 % power transfer.
The one big factor that I'm trying to point out here, when applied to wind turbine with a TSR of 7, 3 m blade diameter running at 9 m/s wind speed there should be 1 kW of output power available from a PMA at 400 RPM "if correctly set up".
With test 1 running at 912 RPM gain to get 1 kW we lack sufficient RPM to get that 1 kW output power potential.
With test 2 we match the 400 RPM, but the output is only 710 W so a bit down on an efficient match.
Now with test 3 we again come close with 395 RPM, but very close to the 1 kW power output potential reaching 950 W output.
It all comes down to optimization and my test results speak for them selves. Yes they have all been logged on the DC side of the rectifier as you have already picked up on.
I'm will now make an decent effort to make some measurements on the AC side within Delta windings to extract the data you chaps are after. This will be of much use to others to transfer the knowledge gained and to apply to other types of PMA's.
Also check out this video linked below and you will see a hint to why I'm achieving the results above, but with no gearing.
https://www.youtube.com/watch?v=8aPIEsnKb6oI'm no longer contributing to 'The Back Shed' if that is what you are referring to by making reference to a visit "down under".