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#Post#: 2454--------------------------------------------------
Re: 175 Watt Seagull DIY Kit
By: sut Date: April 27, 2014, 7:01 pm
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Now I am still way behind on wiring of single phase ,3 phase
(star and delta ) and how many coils you need and wire size. I
can see it in my brain,if you placed wire taps in the stator
when it was made I don't see why it couldn't place jumpers or
hookups to do all 3 different wiring configurations on the
outside of stator. That is an interesting thought I had never
even considered.
#Post#: 2456--------------------------------------------------
Re: 175 Watt Seagull DIY Kit
By: nessprojects Date: April 27, 2014, 7:33 pm
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well the decision has to be made up front before the stator is
built as to:-
single phase would have either 6 or 12 coils depending on how
you construct the stator. (12 magnets)
I would assume LW is going with the 6 coil for this model.
3 phase would have 9 coils (non overlapping) but the
configuration you connect these coils would either give 1.7
times the voltage(Star) or 1.7 times the current(Delta).
I don't see a way to have 3 phase and single from the same coil
configuration, not using 1 phase of the stator would work but
that becomes a waste of a set of coils.
So many options and possibilities but always best to confront
the best/cheapest/easiest options before its too late and the
wire is cast.
#Post#: 2457--------------------------------------------------
Re: 175 Watt Seagull DIY Kit
By: lynx wind Date: April 27, 2014, 7:44 pm
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Yes, the stator can be made with 9 coils for three phase or 6
coils for single phase. I still favor single phase because its
easier and I haven't seen a lot of difference in testing. There
are the choices with 3 phase however. Star (higher voltage)
Delta (higher amps) or even three separate phases which can add
up and give triple voltage with three separate rectifiers.
But with these high speed VAWTs the issue really isn't trying to
get voltage. Its more a matter of matching the alternator to
the best speed right at 1.1 TSR and above.
#Post#: 2458--------------------------------------------------
Re: 175 Watt Seagull DIY Kit
By: nessprojects Date: April 27, 2014, 8:12 pm
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Yes I think you are right, I seem to be trying to
over-complicate things (My head just seems to have gone into
hypa-drive). ;D
Just another thought is to split the 6 coils into 2 groups of 3
and bringing out the start and ends thus giving 12 or 24 volt
charging or even 2 separate 12v systems. Think this setup would
require lots of concentration though to ensure you got the coils
correctly wired or the whole thing would become a failure.
Sorry I am over-complicating again. ::)
#Post#: 2460--------------------------------------------------
Re: 175 Watt Seagull DIY Kit
By: nessprojects Date: April 27, 2014, 8:57 pm
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Well when we use the term 'spikey' what we are referring to is
basically a single phase waveform in which the wave goes up,
over then down to 0v but then goes down/under then up, this is 1
cycle and turbines can do this many times a second just like the
mains in your house.
when a turbine starts to charge it will only be clipping the top
and bottom sides of this waveform, now to charge a battery you
have to convert this ac wave to dc using a rectifier and now
instead of the waveform going below the 0v it is all above but
is still very bouncy.
The video you posted is more like a drag turbine than a high
speed, High speed refers to the blades travelling faster than
the speed of the wind and is known as TSR (Tip Speed Ratio).
Kind of hard to explain but hope it helps.
#Post#: 2461--------------------------------------------------
Re: 175 Watt Seagull DIY Kit
By: happygolucky Date: April 27, 2014, 9:15 pm
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. good explanation ...thanks
#Post#: 2475--------------------------------------------------
Re: 175 Watt Seagull DIY Kit
By: sut Date: April 29, 2014, 7:57 am
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Ok what if you put 2 bolts coming out at each coil 1 for the
start and one for the end of the coil ? then you could wire it
any way you wanted externally all on the outside of the stator
with just short jumpers .Just a thought !
#Post#: 2477--------------------------------------------------
Re: 175 Watt Seagull DIY Kit
By: lynx wind Date: April 29, 2014, 8:44 am
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@SUT,
Yes for a 3 phase stator that is a great idea. Then you can
choose all sorts of voltages. For a single phase there are just
two connections.
Happy,
A serpentine coil offers some advantages in a few instances. I
used to make USVAWT alternators this way with 4.5 Lbs of copper
and you couldn't see through the coils when pressed together.
The disadvantage is that is difficult to achieve as many turns
because the corners bend up high. The length of the wire is the
same as individual coils. An advantage is you can wind one
large coil fast. The disadvantage is it is very difficult
getting as much wire to shape.
To get a lot of turns into a serpentine three phase takes a
strong press mold and then it takes some special tools to get
the resin into the mold. But in some cases this is a great way
to go, especially if you are trying to get a low resistance high
voltage stator at low rpm. I gave up on this route when I
started hitting higher speeds with VAWTs. For guys trying to
make slow turning Lenz wind turbines and drag vawts it is
tougher to make power at low rpm.
#Post#: 2478--------------------------------------------------
Re: 175 Watt Seagull DIY Kit
By: happygolucky Date: April 29, 2014, 10:19 am
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i see your points ....
#Post#: 2479--------------------------------------------------
Re: 175 Watt Seagull DIY Kit
By: lynx wind Date: April 29, 2014, 10:53 am
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My critique was more about the cutting edge of efficiency. I
have made many simple serpentine stators. They are fun to make
and can be wound on a board with dowels for guides. Go ahead
and try it. My Haitian turbine used this type of alternator and
was very simple. The video you posted is very good and a good
guide to follow.
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