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#Post#: 4044--------------------------------------------------
Re: Seagull 175 Alternator
By: lynx wind Date: August 4, 2014, 10:37 am
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Yes, not a typo. If you take two strands of 20 awg together in
parallel it is equivalent to a single strand of 17 awg. If you
take four together in parallel it is equivalent to a single
strand of 14 awg.
The advantage to using smaller gauge in parallel is you can pack
more in to the same space. You can also output to separate
connections which would give you options for 12, 24, 48 volts.
You could up the turns to 55 and get more voltage, but achieving
a lower cutin speed may not be wise if it occurs below tsr 1.0
It might also be possible to use 19 awg instead of 20 awg and
lower resistance even more. I haven't tried that yet.
#Post#: 4050--------------------------------------------------
Re: Seagull 175 Alternator
By: Otis Date: August 4, 2014, 7:39 pm
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Sorry. My skull is pretty thick. So.. 100 turns of 15awg
equivalent to is same as 50 turns of 14awg equivalent?seems like
a big difference for one step of standard measurement scale. Or
did you lower turns of 18awg to be used?
#Post#: 4246--------------------------------------------------
Re: Seagull 175 Alternator
By: nessprojects Date: August 25, 2014, 5:14 pm
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Been doing a little bench test with the alternator I received
from Lynx....Connected a bridge and a 12v battery to the 12v
terminals + Rpm meter.
12v charge was reached at about 100 Rpm so I have a feeling this
thing will not need a booster.
#Post#: 4248--------------------------------------------------
Re: Seagull 175 Alternator
By: sut Date: August 26, 2014, 7:53 am
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What do you use for rpm counter is it your little raspberry
#Post#: 4252--------------------------------------------------
Re: Seagull 175 Alternator
By: nessprojects Date: August 26, 2014, 5:05 pm
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@sut
Yeah I just couple up the arduino to the battery and 2 wires to
the ac side of the alternator (It just has to sniff the
frequency). I only hand wound the alternator just to get a idea
of the 12v cut-in.
#Post#: 4253--------------------------------------------------
Re: Seagull 175 Alternator
By: happygolucky Date: August 26, 2014, 5:28 pm
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report 175 failure.. these are the facts!
my last report.... break dose not work on 175 alternator...
just had 65-70 mph wind blow about the 4th or 5th storm this
summer for about 5 min.. blew the 175 apart this time.... way to
poor/ weak of a design to heavy...wrong pole not sturdy
enough...it has 5 bolts in it now..aluminum airfoil sut blades
twisted an separated opened right up like an envelope .019
aluminum is to weak to use cannot take centrifugal force sorry
sut..gave it a bloody good try.. separated at all seams using
CG goop separated every where the weak link is the fiberglass
rod gives to much bowing ,flexing an twisted apart.. goop glue
did not hold up or stick to aluminum or wood ? top an bottom
former's also failed they split!!!!!!!!!! did see 150-175 watts
you can do the math... before complete destruction..
#Post#: 4254--------------------------------------------------
Re: Seagull 175 Alternator
By: happygolucky Date: August 26, 2014, 5:29 pm
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2nd half of report..
oh an rotor arms are bent down ward sagging started about 1 1/2
months ago, i should say warped.. a total failure!
now the alternator is still blistered bubbling de-laminating an
no brake like in video... i have great wind had been watch the
former's and air foil bulge, i snapped a pic an then took it
down i thought i would wait.... it was from twisting was waiting
for failure... i will now build it my way ...lasted the
summer..would never have made it threw the winter.. what 3
months?
a heavy duty HAWT is in the making for back up as i Begin to
redesign an build my new Vawt ...my solar has out preformed
everything...already have the magnet in the 100 amp PMA
alternator with neo magnets 500-1000 watts at 15-25 mph 80" wing
span start up 2-3 mph- schedule 80 pipe not EMT slip collar with
tie downs never build a wood rotor arms for VAWT..
my advice has always been be honest truthful an fair.. ....use
the best materials available you get what you pay for.. an do
not cut corners..build it cheap you get cheap..
hey CG you the big chief now... i only see your name..? same ole
crow of a few..on board..
hope you can do better..
hgl
#Post#: 4256--------------------------------------------------
Re: Seagull 175 Alternator
By: happygolucky Date: August 26, 2014, 8:20 pm
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ps.. CG i bet you are ! no hard feelings just karma.... an a
experiment that failed my beef was over bad used GTI's that
are fixed now..
i have a many a spare vawt parts.... have some made from
aircraft aluminum, lighter etc.. also the steel shaft on magnet
plate has some wear? or crust or galvanic corrosion or rubbing
aluminum, i suspect it may have been rubbing inside alum hub
hope it did not oblong ID should bore an have ss sleeve pressed
in alum hub threaded at the bottom for set screw... it has been
under a wind spin 80% of the time.. this summer. i have a nice
dc-dc 400 watt buck booster..drives from 3v in to 60v out with
meter... going to use it in low wind applications.. this vawt
will not do over 100 watt without failing.. as it was delivered
an built.. your best is 50-75 watts on a good day 25 mph
anything over an it will fail...
after a complete tear down i examined it further... a few of
the magnets separated from the epoxy you used LYNX what was it?
may just fill with epoxy resin an put in housing? very strange
it was out of alignment with other magnet i tapped it back in
line? what kind of epoxy did you use?...i like loctite on the
magnet plate, paint is rustoleum ... that magnet will have to
be re-cemented if the slot was machined in the magnet plate
it would not move hint hint!
i will make some changes an have another up an running...this
week!
#Post#: 4261--------------------------------------------------
Re: Seagull 175 Alternator
By: happygolucky Date: August 27, 2014, 10:53 am
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well sut.. i have completely disassembled the 175 for further
inspection.... nothing to salvage but magnet plate... i have to
re epoxy a few magnets, spars an straps ok.. it's all in pieces
wings bent an open as i described...but i can take pics of those
parts... getting ready for a rebuild.. if the weather breaks..
last night have some painting an redesign work to do... i did
not save any pics sorry thought i did... the wife, son an
neighbors an myself are my only witness.. did not save the
earlier pic's either sorry, LYNX knew what was going to happen
he said he was worried/afraid, quote un quote.. about it.... i
saw what was happening too after his event.. i expected failure
sorry that's physics......as far as balance it was balanced..
but no breaking system it will not stop under wind load ..... an
water did not penetrate any where until it opened up... it had
no effect unless... while spinning at high speed an driving
rain maybe rain did beat on it adding more stress?sure was
bending it was bending an bulging an twisting, we could see it
happen i was watching.. it was sealed tight as a drum with
silicone .. to much stress under max wind conditions weak
design links causing seam failure.. it started with a bulged at
the former bottom an top from fiber glass rod twisting an
bending an then bent in the middle opening the seams... the rest
is history.. sut... but i will see what i can do..
#Post#: 4262--------------------------------------------------
Re: Seagull 175 Alternator
By: lynx wind Date: August 27, 2014, 11:05 am
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This discussion is misplaced on this thread. The topic is the
Seagull 175 alternator.
But to add on, the Seagull 175 that SUT and I built is doing
great, rock solid and performing. Just no 15+ mph winds in
August except a few sporadic squalls. Yesterday's brief squall
had it working hard for about five minutes as the storm ran
through. Good winds come in the fall. I am sure we will get
good data from Nessprojects on performance and endurance.
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