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#Post#: 3109--------------------------------------------------
Re: Seagull 175 Alternator
By: nessprojects Date: June 2, 2014, 8:19 pm
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@cg
Good to use schottky diodes but then you would have to make the
bridge from schottky diodes or the bridge would not take any
strain due to diode voltage drop differences (Theory only and
not tested by me).
@hgl
Cut-in speed is when it starts to charge a battery.
50% is in reference to the efficiency of the alt at the
particular speed.
hgl....we are not concerned with how many coils and magnets
(they have already been determined) we are trying to get the alt
to match the battery to the best we can. The lower the
resistance on the coils the better it will load into a battery.
the boost just makes it start charging in (Eg 7mph instead of
say 12mph), We are trying to get the best of both worlds.
#Post#: 3110--------------------------------------------------
Re: Seagull 175 Alternator
By: happygolucky Date: June 2, 2014, 8:22 pm
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very, good thank you .....@ness i was just curious what the cut
in speed is on the 175 was i will find out later....... i was on
a Hawt site form some of you guys may no each other... few names
appeared on both sights i recognized..... i'm not in
correspondence... just learning about how old PMA's where made
in the old days with thick wires .. using ferrite magnets
before neodm came along.. making all these big fancy
alternators was what i was referring too... to do the same thing
charge batteries an covert ac to dc..vawts seem so much more
efficient.. just trying to grasp the technology from the
foundation days..
#Post#: 3111--------------------------------------------------
Re: Seagull 175 Alternator
By: lynx wind Date: June 2, 2014, 8:58 pm
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Here a couple pics. Happygolucky made the steel disk. The
handcrank is just for testing. A hz meter is an easy way to
watch rpm. The four connectors protruding from the bottom are
start and end for each of the parallel coils. You can see the
coils through the plastic but that's Ok, because we want the
wind to cool the stator. There are 200 sqin of stator surface
to bleed off any heat. Thankfully all that surface area is in
the wind too. The indents on the bottom are coil positioners in
the mold.
#Post#: 3112--------------------------------------------------
Re: Seagull 175 Alternator
By: happygolucky Date: June 2, 2014, 9:17 pm
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nice picture tutorial definitely need to fill the whole stator
with urethane , i see what you mean now ......
#Post#: 3113--------------------------------------------------
Re: Seagull 175 Alternator
By: nessprojects Date: June 2, 2014, 9:26 pm
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There are only 2 separate 12v connections on the alternator.
12v in series with 12v =24v.
12v in parallel with 12v = 12v but at a higher amperage.
Nice pics Lynx.
#Post#: 3114--------------------------------------------------
Re: Seagull 175 Alternator
By: happygolucky Date: June 2, 2014, 9:39 pm
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thx.i was think'n 9 coils.. good night gentlemen an wise
men...sleep well..
#Post#: 3115--------------------------------------------------
Re: Seagull 175 Alternator
By: lynx wind Date: June 2, 2014, 9:50 pm
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There are 785 feet of wire in the 175 alt all totaled for 5 ohms
If I switch to 16 awg and 785 feet the ohms will drop to 3.14
(pie)
3 ohms is pretty close to the resistance (theoretical) of two 12
volt batteries
In parallel the ohms will drop to 0.75 Less than that of one
12 volt. That means the load will be getting hot before the
stator does - efficient!
I think it's possible to get the full turns of wire in. There
is more room on my former I didn't use. There is enough room in
the stator.
#Post#: 3119--------------------------------------------------
Re: Seagull 175 Alternator
By: Otis Date: June 3, 2014, 6:11 pm
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@np any idea how many ma 440uf low esr caps(two 220's from Radio
Shack in parallel ), would allow through on the cockcroft-
walton booster? Any formula for estimates?
#Post#: 3120--------------------------------------------------
Re: Seagull 175 Alternator
By: nessprojects Date: June 3, 2014, 6:19 pm
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@cg
Nice circuit board, Should work really good.
@Otis
I don't have any formula but at a guess I would say 600-800ma,
220uf seems to do around 350ma.
#Post#: 3128--------------------------------------------------
Re: Seagull 175 Alternator
By: Otis Date: June 3, 2014, 7:24 pm
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Thanks for response. It does sound like you expect it to
continue increasing in a straight forward way. Double the caps
that give you 350..Probably 700.tripple those caps maybe 1000 or
something...
Makes matching to particular alt or configuration much easier.
Thanks
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