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#Post#: 3089--------------------------------------------------
Re: Seagull 175 Alternator
By: lynx wind Date: June 2, 2014, 1:59 pm
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I quickly tested the 175 alt. With the boost it starts charging
at 65 rpm. I will do some more testing this afternoon to see
where it hits certain voltages. I like the feel, it is a soft
thrumming feel instead of the bumpy single phase feel.
#Post#: 3091--------------------------------------------------
Re: Seagull 175 Alternator
By: happygolucky Date: June 2, 2014, 2:17 pm
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what was the voltage at 65 rpm.. with boost?
#Post#: 3093--------------------------------------------------
Re: Seagull 175 Alternator
By: lynx wind Date: June 2, 2014, 3:54 pm
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Here are the results of testing
The alternator is 50% efficient at 350 (1/2 hp) watts of input
and will output 175 watts and lose 175 watts in the stator
P=I*I*R, Power lost in stator is Amps squared X Resistance
This 350 watts input occurs right around 24 mph for the Seagull
175, so we can expect about 175 watts at 24 mph and around 275
rpm
Coils in parallel 12 volt charging 1.25 Ohms 100 turns (15 awg
equiv)
Boost 12 volt peaks at 30 rpm
Boost 12 volt rms at 50 rpm
w/o boost 12 volt peaks at 100 rpm
w/o boost 12 rms at 160 rpm
Coils in series 24 volt charging 5.00 Ohms 200 turns 18 awg
Boost 24 peaks at 30 rpm
Boost 24 volt rms at 50 rpm
w/o boost 24 volt peaks at 100 rpm
w/o boost 24 volt rms at 160 rpm
100 rpm is TSR 1.09 at 11 mph
160 rpm is TSR 1.28 at 15 mph
#Post#: 3094--------------------------------------------------
Re: Seagull 175 Alternator
By: nessprojects Date: June 2, 2014, 5:11 pm
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Those readings look very nice to me....Think you got a little
gem with that alt.....Very nice work and well impressed.
#Post#: 3095--------------------------------------------------
Re: Seagull 175 Alternator
By: lynx wind Date: June 2, 2014, 5:26 pm
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Thanks Ness. Since this was a first try, lets talk about what
could be changed.
What would you think about the alt having a lower resistance and
higher rpm cutin? Then rely on the boost for catching the low
watts in low winds. I thought that's what I was going to get
but the voltage is a bit higher than I expected. So perhaps
sneaking up to 16 awg wire same layout? Or backing off the
turns to 180 instead of 200?
Or should I leave this alone? Thoughts? You know more about
the boost than I.
#Post#: 3098--------------------------------------------------
Re: Seagull 175 Alternator
By: lynx wind Date: June 2, 2014, 5:54 pm
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Some more testing
100 rpm through boost there is 50ma or about 1 watt
120 rpm through boost there is 150ma or about 2 watts
160 rpm through boost there is .500ma or about 6 watts
w/o boost
120 rpm there is 50ma or about 1 watt
160 rpm there is .500ma or about 6 watts
Advice on capacitors? I am using the 220uf
#Post#: 3099--------------------------------------------------
Re: Seagull 175 Alternator
By: nessprojects Date: June 2, 2014, 6:08 pm
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@Lynx
Hmmm....Dropping back to 180 turns with same gauge I don't think
will gain too much but dropping wire size will always be a good
thing.
Could you squash thicker wire in allotted space and maybe
sacrifice a few turns ?.
You have a better idea of vawt characteristics and performance.
I think it really depends on the location the turbine will be
running.....Think they are good figures for a low wind area.
The booster can be adjusted to suit the turbine but should the
caps blow out you lost all low cut-in.
It is Kind of tricky because what is good in one location may be
rubbish in another. My average here is about 10-20mph.
I think it could be worth on you next one to drop the turns
slightly but with the thickest wire possible to get the 5 ohms
on 24v down a bit.
#Post#: 3100--------------------------------------------------
Re: Seagull 175 Alternator
By: nessprojects Date: June 2, 2014, 6:14 pm
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Yeah I thought the caps might be low, Parallel a couple more
220uf`s. best to start low.
220uf seem to top out at about 350ma.
#Post#: 3102--------------------------------------------------
Re: Seagull 175 Alternator
By: lynx wind Date: June 2, 2014, 7:06 pm
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Ness,
Thanks for the thoughts. I agree.
I am very pleased with this alt, just greedy for a few more
watts before hitting the 50% wall. I have enough wire for about
three alts. Lets experiment with this and maybe in the near
future I'll try 16 awg and go for 180 turns. That should drop
resistance by almost half and voltage just a bit.
#Post#: 3103--------------------------------------------------
Re: Seagull 175 Alternator
By: happygolucky Date: June 2, 2014, 7:31 pm
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what is the cut in speed ?
when you say the hit the wall what are you refereeing too..50%
wall you refer too the betz law?
lynx you said:
We don't want direct cut in below 1 tsr. At 12 mph wind the
Seagull 175 turbine needs to be doing 150 rpm to be at tsr 1.5
at 150 rpm voltage should be 9.9 volts rms with peaks of 14.85
volts. This means the turbine wont be loaded too much in winds
below 12 mph. The boost circuit will handle winds below 12 mph
where the watts are between 0-15.
@ness said drop the ohms on 24v side what would be ideal ohms?
change wire size for loss of voltage your happy lets play with
this so many questions.. i think it is right in the ball park of
what you thought it may be.... been comparing notes with
different stators an magnet set up numbers from other
sites..3-6-9 even a 10 coil 4-12 magnets etc ....seems there is
no real formula just hand me down recipes from experienced
builders with scars can't say there is not any formulas but it
is interesting ...great job to you both.... @ ness dose the
capacitor keep it from stalling ..?in low winds and building a
charge for low voltage increase..?
hgl
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