Stator

[watto24]

I have made my first wind generator and i have it now out in the wind , i am having a problem with the stator , i have connected the coils in series and spinning by hand i get up to 8v ac, now i have tried to three phase the coils in order to get more out of it but all i get across any two phase is about 3.7 volts ac. now this i much less than the single phase which should not be , what have i done wrong.

i have 12 coils #18 , 18 mags 1" each ,11" rotor , steel backed , saw blade laminated  .

[Flux]

"what have i done wrong."

Everything I suspect!

How on earth did you dream up that 18 magnet 12 coil idea. That doesn't work for single phase or three phase. I haven't the time to puzzle out in what form it is working.

Besides that why do you think 3 phase would give more volts than single phase even if you had a combination that could be connected for either.

With 18 poles your only simple option is single phase with 18 ( or 9 ) coils.

Don't try for 3 phase with pole numbers not divisible by 4 unless you want a strange winding.

Do some reading here and just don't pick silly coil and magnet numbers out of a hat. There are very few combinations that produce absolutely nothing but the results are not going to be much use.

Flux

[watto24]

ok thanks for your reply, what should i work with then , 12 coils 16 mag, 12 coils 12 mags or 12 coils 8 mags.

Thanks

be gently i am new to the business.

[Flux]

12. coil 16 magnet works for 3 phase.
    
12. coil 12 magnet works for single phase.
    
    

The other one, forget it.

You can get more POWER from 3 phase, but for a given number of turns per coil the single phase will give more volts.

The coils for the same voltage 3 phase will need more turns but that is not a disadvantage.

As this is a small machine you may find single phase satisfactory but generally I wouldn't touch it.

I think it is Hiker that has done several little machines with saw blades, have a look at his files.

Flux

[watto24]

Thanks Flux i will try it and let you know the results.

[finnsawyer]

I don't get it.  You have it in the wind and you are spinning it by hand.  How can you do both?  If you get 8 volt ac by spinning it by hand with the coils in series, you are on the threshold of charging a 12 volt battery.  So, put it on the mill and see what you get in a decent wind.  Since the output will be single phase you will need a single bridge rectifier to rectify the output.  The power out, if you get any, will depend on the resistance, which you don't specify.  In any case such experimentation will certainly help your "learning curve".