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#Post#: 295--------------------------------------------------
Re: Seagull DIY Discussion
By: burnit0017 Date: August 28, 2013, 3:48 pm
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CG, looking good, great work. It is good to see you are still
working on it. When do you plan to test?
#Post#: 297--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: August 29, 2013, 8:40 am
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I see that the magnet spacing is the same but they are placed
out further on the disk! because the disk is larger in diameter,
so doesn't that cause the magnets to go across the coils at a
different spot ? (closer to the top of the coil )
#Post#: 299--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: August 29, 2013, 11:19 am
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Ideally magnets should pass by copper wire at a 90 degree angle.
But to achieve that perfectly would require the coils to be
much larger and therefore resistance would go up - bad. The 2"
long Neo magnets are just slightly longer than the ceramic
hardware magnets (1-7/8") and cover a bit more of the coils.
There is some compromise in the design of these alts that makes
them pretty darn good for a DIY project.
If you want you can modify your design so that the center of the
magnets are over the center of the coil leg.
Crazy Guy has made some modifications that I admire. It will be
nice someday soon to compare performance of different builds.
#Post#: 300--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: August 29, 2013, 7:16 pm
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Thx for the answer CG & LW now I understand ! I don't think I
will mod any plans (unless I run into unexpected complications
of my own doing . I think all the work going on here is
fantastic, and hope I can add some helpful information some day,
for now I am just trying to understand. I have built 2 windmills
1 vawt and one hawt and both have been just about useless as far
as making any usable power . I have the rare earth magnets that
will fit your design and the steel plate so all I have to do is
wind your coils and build the windmill . I will take my time
doing this so I don't make to many mistakes Thx again
#Post#: 301--------------------------------------------------
Re: Seagull DIY Discussion
By: burnit0017 Date: August 30, 2013, 2:51 am
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Hi sut, what is your average daily wind speed???
#Post#: 303--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: August 30, 2013, 7:45 am
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LOL that's one of the biggest problems I have, I live in an
area with a lot of trees ! and they are big and tall,but that
has not stopped me from trying to make a usable windmill. I get
quite a lot of mixed wind here that will turn my Hawt but the dc
motor is not up to the task . My Vawt is to big and to many
points that can come out of adjustment and throw things off
kilter. Now as far as my generator building skills well lets
just say unsuccessful. So I am glad I found this sight, I really
like the single phase design and the diy kit (so much to learn )
#Post#: 304--------------------------------------------------
Re: Seagull DIY Discussion
By: burnit0017 Date: August 30, 2013, 8:36 am
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Hi, are you familiar with MPPT technology? Basically it is a
buck converter with a variable duty cycle. It prevents the
turbine from stalling. The turbine will run at a higher RPM and
the circuit converts a high voltage with low current to a lower
voltage with higher current at the output.
#Post#: 367--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: September 8, 2013, 11:05 am
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Nicely done. Nice rpm.
Keep in mind you can't get out more watts than the turbine can
produce, which is maybe 40-45% at its peak in 8-10 mph. The
turbine will lose efficiency in higher winds, but of course
every time you double wind speed, power in the wind goes up by a
factor of eight.
The Seagull 75 was designed to operate at its best rpm across
the range using the stock alternator. You have a higher voltage
alternator which may require a 18-24v battery, otherwise the
turbine may not get above TSR 1 (tip speed ratio to windspeed).
It really needs to be turning at 1.5-2.5 TSR.
You might try powering a 110 volt LED bulb directly from your
circuit (without the rectifier).
#Post#: 369--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: September 8, 2013, 3:06 pm
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No, I understand that. Your voltage (no I-Kick) with a fan
blowing would indicate your alt may be a bit too high voltage,
but it may be close. You will be surprised what happens in real
wind, 7-9 mph where there is some power. That little 5.5 volts
turns into 7-9 volts with voltage spikes at 20-60 hz, plenty to
charge a 12 volt. At 10-12mph the amplitude and frequency
increases and so does the charge to the battery.
#Post#: 385--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: September 12, 2013, 11:00 am
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thx for that info! That' good to know! The steel plate I will
use on my gen.should be about 3 times the thickness of 1 saw
blade(if i remember correctly) I am not sure though, and since I
am not in same state as windmill parts I cant check. I am
keeping up to date with all that's going on here! can't wait to
get started on building mine. I have been thinking on replacing
the bushing on plans with a bearing, but that is going to
require more work with figuring out how to mount them and
placement becomes a little bit trickier( not to mention the
added cost) .
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