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#Post#: 3134--------------------------------------------------
Re: Seagull 175 Alternator
By: Otis Date: June 4, 2014, 12:35 am
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@np. Do bigger caps make any difference in startup? I tried a
few bigger sizes and once spinning I don't think my turbine
stalled, but Iwas worried that maybe it took more wind to start
.
#Post#: 3138--------------------------------------------------
Re: Seagull 175 Alternator
By: lynx wind Date: June 4, 2014, 7:25 am
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A couple things,
You don't want to draw more power than there is at a given
windspeed or the turbine will stall. I wouldn't want to draw
any power until tsr approaches 1 Better to extract power when
rpms are higher. The VAWTs that I design will act as drag
machines but there is far more power above tsr 1. HP = speed x
torque, HP equates to watts
In a perfect world you would design the alt to output along a
power curve that allows the turbine to run between 1.2-2.5 tsr.
In a 6 mph wind the 175 will need to turn at 60 rpm for a tsr of
1.2 Nessproject's boost circuit pretty much meters low wattage
at the slow speeds.
A stronger alt with big magnets and low resistance will act more
like a direct short and stop a turbine faster and harder. The
175 is just about impossible to turn by hand at 1/2 rpm when
shorted.
#Post#: 3139--------------------------------------------------
Re: Seagull 175 Alternator
By: lynx wind Date: June 4, 2014, 10:54 am
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I modeled 16 awg and I don't think there is enough room for the
geometry. Could try it someday.
17 awg will fit and drop resistance to
12 volt - .99 ohms
24 volt - 3.975 ohms
#Post#: 3142--------------------------------------------------
Re: Seagull 175 Alternator
By: happygolucky Date: June 4, 2014, 11:04 am
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thats good numbers.. it did lower them ..i'm impressed with @
ness knowledge an suggestion.. ! well done...
#Post#: 3145--------------------------------------------------
Re: Seagull 175 Alternator
By: nessprojects Date: June 4, 2014, 6:04 pm
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@Otis
Using larger caps should not impede start-up but you must be
careful that the turbine does not get 'stuck', this is when it
needs a large wind increase to give more charge current.
@lynx
The larger the wire the better in my opinion, only concern is in
high winds will tsr drop due to the power of the alt making it
stall ? (a sort of mismatch between alt and blade power).
#Post#: 3148--------------------------------------------------
Re: Seagull 175 Alternator
By: lynx wind Date: June 4, 2014, 7:28 pm
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@ ness
In my research I found that the Gull 160 (and all the VAWTs I
now make are similar) are 40%+ efficient at turning wind to
rotary motion even in high winds. I have only data logged up to
32 mph, but I saw no drop off. The killer of electrical output
at the top end of the power curve is the alternator and physics.
Darn laws of physics!
I am sure at some point the wind will see the spinning object as
a solid, but I don't know where that is yet.
#Post#: 3220--------------------------------------------------
Re: Seagull 175 Alternator
By: lynx wind Date: June 8, 2014, 11:42 am
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Here is a video of the prototype Gull 175 alternator. By
changing the wiring on the stator you can change voltage output
from 12 to 24 volts. Designed for low wind trickle charging
through the boost circuit and direct charging at 150 rpm.
It's tough to develop a lot of torque and rpm holding by hand
and with a 4" lever arm, but you get the idea.
HTML http://youtu.be/30nfwyaNxuo
HTML http://youtu.be/30nfwyaNxuo
#Post#: 3223--------------------------------------------------
Re: Seagull 175 Alternator
By: happygolucky Date: June 8, 2014, 4:51 pm
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very nice video.... an well made alternator..lynx! when can i
pick it up!
HGL
#Post#: 3237--------------------------------------------------
Re: Seagull 175 Alternator
By: Otis Date: June 9, 2014, 9:49 pm
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Great videolynx .. Are you using 220uf caps in the booster?
Nice mag disc too.
#Post#: 3300--------------------------------------------------
Re: Seagull 175 Alternator
By: admin Date: June 13, 2014, 8:19 am
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[member=61]Otis[/member],
In the video I am using 1000uf capacitors and 3 amp diodes. The
bridge rectifier can handle 35 amps and is mounted on an
aluminum heatsink. The turbine is strong enough to overcome a
1-2 amp load. I have burned through jumper wires when dead
shorted. I saw arcing in high winds between two stator
connectors one time. Build strong and light.
It is hard to hand crank an alternator with a 4" lever arm while
just holding the hub. Firmly mounted and with a 20" lever arm
it would be much easier. The most I have ever cranked by hand
is about 110 watts for a short period. People don't appreciate
just how much power things take. Because they just flip a
switch on and a toaster does its thing they don't realize that's
about 4 hp. When you start making power from scratch it becomes
so much more evident.
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