Hi everyone.
After months of on-off works on my VAWT I'm about to finish this project in the coming weeks.
The turbine is a 3 blade (lenz 2) design (app 2 m diameter with 2 meter tall blades).
So far the wind turbine was turning without the generator attached to it and was performing quite well.
It's turning slowly even when I can't notice the wind, and Is quite resistant to strong gales (it won't do more than 3 rev per second, no matter how strong is the wind).
I also finished generator (app 500mm diameter axial flux design with 16 "N 38" magnets (12x25x50mm) on each side.
The stator consist of 12 coils wired with 1.8mm2 wire - 215 turns.
So far I have it fixed in my workshop in vice and I'm doing some testing.
With 1 rev per second I'm getting app. 4 - 4.5 Volts.
When I connect all 4 (same phase) coils in series I'm getting app 15-18V with app.1 rev/s.
I want to use the generated power to help heat the water in my water tank (300ltr).
I wonder which configuration would be more suitable for me delta or star?
I understand roughly the cons and pros of both connections, but would like to hear the pratical advice on what to choose (the length of power cable required from turbine to heater will be app.20-25m).
Additionaly I would appreciate clarification on connection of star and delta...
I found on the following page:
http://autonopedia.org/renewable_energy/Generators/pmg.htmldiagrams showing delta and star connections:
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I'm confused with the coils in invidual phases being connected (-) to (-) or (+) to (+)
Is it because of the magnet configuration?
I have my connected as (-) to (+) and so on - forming an open loop.
I would appreciate all the replies, as I want to finish this project ASAP.
Bye
Michal