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#Post#: 498--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: October 3, 2013, 7:50 pm
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Now that's a great piece of information to use before I cast
the stator . will any batteries work like a 9 volt or do you
need to use a big 12 volt batteries ( car )
#Post#: 499--------------------------------------------------
Re: Seagull DIY Discussion
By: ldissing Date: October 3, 2013, 10:35 pm
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@Crazyguy
I should have thought of that...using a battery.
@Sut
You can use a 9V battery to do that test....you just need to
touch the coil to the battery briefly. You could just lay a
ceramic magnet on the coil and touch the leads to the battery.
If it flips, then you know what the polarity of the first coil
is, so leave the magnet on the side that is attracted and move
to the next coil, touch again, and it should not move...if the
coil is connected and oriented correclty. If it flips
again...you either connected the output to an output or flipped
the coil bottom to top.
#Post#: 505--------------------------------------------------
Cut In
By: ldissing Date: October 5, 2013, 8:29 am
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I assume "cut in" means when it would actually start charging a
12V battery.
@Lynx Wind
#Post#: 506--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: October 5, 2013, 9:10 am
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18 awg is really overkill for this turbine. Way too heavy.
You would be much better off with the 24 awg. Make sure to wind
the spools completely full. No need to count turns. You will
need to compress the coils to get them in, just don't use
anything sharp. I shoe horn mine in by tapping with a piece of
wood and then sandwiching with plywood and clamps to flatten
them down. 24 awg will probably give you a total resistance of
6-8 Ohms which wont hurt anything.
What will happen is the voltage spikes will be higher and the
sine wave lower frequency at the lower cutin rpm. So with
rectification charging will only occur with the spikes like
pulse charging. If there is only 10 watts in the wind for this
swept area you can't get more than about 3-4 watts out. That's
just the nature of energy conversion. With the 18 awg wire you
might not see charging until winds are 20-30 mph. Of course
your efficiency will be better, but if winds on average are 10
mph it would be better to use 24 awg and run efficiently.
I built an alternator once with 24 awg and expected the
efficiency to suffer in high winds due to resistance. That
little alt put out 150 watts at 22 mph.
#Post#: 507--------------------------------------------------
Re: Seagull DIY Discussion
By: ldissing Date: October 5, 2013, 11:14 am
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Okay, I'm trying to calculate the actual turns based on the
voltage I would like to have.
I have 200 turns on my coils now and I agree, that the wire is
too big (but I could not get 20 gauge quickly). Based on the
calculations for magnet area, turns and 300 rpm, it basically
says that I'm getting 6460 gauss out of the magnets (not very
good or maybe it is actually double that because I don't know if
it should be 6 or 3 passes per rev) which would depend on
distance from the magnets, etc. The magnets are N42s which
should be 13200 max, so double would be 12900 which seems more
reasonable.
So, based on this I need 800 turns of some gauge wire not to
exceed 9 ohms for cut in around 150 RPM (1/2 the speed double
the voltage). I'm sure I can get 800 turns of 24 gauge wire
into that area, but I'd have to figure the number of feet of
wire it will take so the resistance can be calculated....will
work on that.
@Lynx
Thanks, I'll just build with the 24 gauge wire....I don't really
have a choice unless I want to spend another $120 for 22 gauge
wire anyway.
Also, I know why the gauss appears to be low, because I built
coils that are 11/16th of an inch thick and those 1/4 inch
magnets probably don't reach to the bottom of the coil very
well. I'll make the base 3/8ths or put a spacer under the coil
and make the coils 3/8th of an inch thick, which means I may
need less than 800 turns, so I'll just fill up the spool and it
should be fine, but I'm gonna count, because I want to know how
many turns is on the coil.
#Post#: 510--------------------------------------------------
Re: Seagull DIY Discussion
By: ldissing Date: October 5, 2013, 3:52 pm
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If I were to put in a reed switch, I'd be able to charge with a
voltage pulse!
#Post#: 514--------------------------------------------------
Re: Seagull DIY Discussion
By: ldissing Date: October 5, 2013, 7:57 pm
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No, I did not see that post....I've known about it for a LONG
LONG time.
Timing is everything on the voltage spike you can get out of a
coil with current going through it.
#Post#: 518--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: October 7, 2013, 5:51 pm
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OK just took apart my old windmill to get at the magnet plate
and magnets!( what a pain to get the magnets off that plate )
This plate is 8 1/4 inches in dia. and 1/4 inch thick and had 12
neo magnets on it. My question is will this plate work since its
8 1/4 in in diameter or should I cut it down to match the
diameter specified in instructions for the diy 75 ?
#Post#: 520--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: October 7, 2013, 7:45 pm
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It'll work fine. Just make sure the magnets are in the correct
position in relation to the coils.
#Post#: 533--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: October 8, 2013, 9:34 am
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thx for the answer
Has anybody tried to make the wings out of aluminum flashing
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