winding with #15 awg

[Jason Wilkinson]

Hi  i want to try the 12 footer,24 volt turbine,every thing is done except the stator.The BOOK calls for 45 turns #14, 2 in hand, i'm unable to get the #14 wire so i bought #15 instead. 16" disk 16 2x1x1/2 n42 neos  how many turns of #15 should i use`

[Flux]

I don't have the book so I can't tell if you have changed anything else.

If the only change is from #14 to #15 wire then keep the same turns. It will stall a bit less and probably give a bit more out in modest winds. You will have to watch the furling as it will handle less current and may be a bit more inclined to make more.

If you have increased magnet disc size then there may be better ways of using your wire but I don't have enough details.

Flux

[Jason Wilkinson]

Thanks Flux,disc size is according to the book  my concern is the magnet strength when i order magnets i can't be sure of the grade.My 6ft blade (12 diam rotor )weight 31 1/2 lbs are they too heavy ? is there a way of lightening them ?made from 3 in planks of pine

[ibeweagle]

area wind 2 wound with #18 2h 70 turns but only with 12inch rotors so you should be able to get 2h #15 70 turns for 12 footer on a 16inch rotors they use round magnets on other powers and to close air gap flying for 2 yaers now have not seen over heating off stator should get 2.89vac reading from meter on one test coil with about .70-.75 air gap cheers ibeweagle

[Flux]

If you can't be sure of the magnet grade then just wind for the lowest grade. If you get higher grade ones you will have to increase the air gap to compensate.

With the smaller blades you will run a bit faster and even the worst grade would be ok.

If you knew you were getting a high grade you could reduce turns a bit and have lower resistance but the current rating is more affected by wire size than the actual power dissipated in the stator. Even with lower resistance of less turns you have less copper area to get rid of the heat.

Don't worry about blade weight. The only thing you can do to reduce it is make sure you keep to the correct blade thickness. If you are thicker then you may have more weight than you need. Weight as such doesn't matter much except for raising the turbine.The main thing is to keep things thin and light at the tips where excessive weight increases inertia and cf forces.

If the bearings were adequate for 17ft you will be ok at 16ft.

Flux

[Jason Wilkinson]

Thanks again flux  and others

 jason

[luv2weld]

Jason

Ref: 12 footer,24 volt turbine,every thing is done except the stator.

If everything is done except the stator, wind a test coil and use

the same number of turns that the book calls for and then adjust

up or down from there to get the output that you want.

Ralph