DIR Return Create A Forum - Home
---------------------------------------------------------
Lynx Wind Forum
HTML https://lynxwindforumhtml.createaforum.com
---------------------------------------------------------
*****************************************************
DIR Return to: Wind Power
*****************************************************
#Post#: 587--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: October 15, 2013, 4:51 pm
---------------------------------------------------------
Idissing
Yes, you got it. Everything you are saying is correct. I made
the original Seagull for the builder with average skills, tools
and understanding. Then I tested it.
I do think it should be tested more and improved and tweaked for
better performance. I was trying to limit the number of magnets
and the overall complexity of the machine.
Voltage is a function of number of turns, poles and flux passes
per revolution. The current Seagull design is limited by having
only three coils and six poles which requires rpm or turns to
increase for an increase in voltage. At cut-in it is just the
spikes (minus diode drop) that starts charging. RMS is root
mean square which on a sine wave is about 2/3 up the spike.
The concept with the Seagull is that there is very little power
in the wind at 10 mph. So we are just using the peaks to charge
allowing the turbine to spinup faster to a point where the power
out equals power in.
My concern is that you aren't seeing this charging at 150 rpm.
I haven't counted the turns on my coils and Ohm readings are not
very accurate on my meter when we are talking about the
difference between a reading of 3.0-4.0 Ohms (total of 9 - 12
Ohms).
I do wind my coils tight and full with 20awg Essex wire. So I
may be getting twice as many turns as you are for twice the
voltage at 150 rpm.
The Seagull has a fairly small diameter so it can spin up to
1000 rpm. The Gull 40 with its 20" diameter will spin up to
1400 rpm in 30 mph winds.
#Post#: 588--------------------------------------------------
Re: Seagull DIY Discussion
By: ldissing Date: October 15, 2013, 6:01 pm
---------------------------------------------------------
@Lynx Wind:
Well, 9.4 volts at 300 rpm for a single coil would = 4.7V at 150
RPM. Multiply that by 3 and you'd get 14.1 volts which should
charge a 12V battery @ 12.5V.
So, I'm in the ball park with 24 gauge wire, but the ohms seems
high...but that isn't the issue, it is the voltage, right?
I'll wind two more and put them in a stator mold and test them
out.
Leroy
#Post#: 608--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: October 20, 2013, 7:17 am
---------------------------------------------------------
Good morning all
In reading through the instructions In making the diy 75 I
don't see anything about placing the magnets all with the same
pole facing up ! Does this not matter with a single phase alt
#Post#: 611--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: October 20, 2013, 10:29 am
---------------------------------------------------------
@cg thx for that information ! its been a while since I made a
alt and I forget lot of things, I don't want to make any
mistakes .
I have another Q I have all of my coils and I I took a ohm
reading 1st coil read 1.7, 2nd read 1.9, 3rd read 2.0 The 3rd
coil is bigger than the first 2 and am having trouble getting it
to fit in the form (even when I really shoe horn it in ) should
I take a couple of wraps of wire off the 2.0 ohm's coil to get
it to drop to 1.7 ohms 0r 1.8 and make it easier to get in the
form, Or make the 3rd coil form a little bigger? I also took a
reading with all coils hooked up in series and they Ohm at 5.4
thx again for all the help I am getting here! you guys are a
life saver
#Post#: 613--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: October 20, 2013, 11:46 am
---------------------------------------------------------
It's a tight fit. It's important to squeeze the coils side to
side so the coil legs are in the right spot relative to the
magnet spacing. Don't change the stator form!
I remember having to really squeeze them hard by putting them on
edge and pushing down. You really need the turns so you may
want to try getting the big one in first. If you can, then add
a few turns to the smaller one. Solder and insulate any join of
coil wire.
Function wise it wont matter if one coil has a few less turns
than another because they are all in series.
The coils will stand high once in and then when its time to
resin, you'll need to be ready with a plywood press and lots of
clamps to squeeze them down.
I have found the biggest mistake people make is not getting
enough turns in an area. It's amazing how much copper can fit
in a small space.
My first coils in series Ohm'd at 5.4.
#Post#: 614--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: October 20, 2013, 2:40 pm
---------------------------------------------------------
@lynx OK will do! Ill get bugger clamps to squeeze them
buggers in !! and thank you everybody for helping me
#Post#: 617--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: October 21, 2013, 2:38 pm
---------------------------------------------------------
Ok today I did a dry run of my alt, got it all wired and set in
form ready for resin . I placed my magnets on the plate with out
gluing them in place (take it from me those neo magnets do
cause cuts when they snap in place if your fingers are in the
way ). I used about 1/2 inch gap in between magnet plate and
stator (didn't want magnets to hit wires ) when I spun it with 1
finger I was getting about 6 volts ac, put in the rectifier and
got about the same volts dc . So it looks like everything is
wired correctly and all set for resin .Now all I have to do is
finish making wings and glass it all ( this is exciting getting
close ) !!!!!
I will try to make a video on my way of making the wings and
post in that section soon I hope
#Post#: 619--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: October 21, 2013, 6:50 pm
---------------------------------------------------------
@Sut
That is very good and also very interesting. I am glad things
are coming along and the test went well.
#Post#: 629--------------------------------------------------
Re: Seagull DIY Discussion
By: nessprojects Date: October 24, 2013, 8:06 pm
---------------------------------------------------------
Firstly this is my first post so many thanks to Lynx for the DIY
plans.
Just like to say that I am underway with the turbine nicely but
did make a slight alteration to the magnet plate that could be a
good thing or could be bad, will have to see.
Plate was cut from 4mm mild steel plate in a triangular
configuration with 300mm (12" for you guys as I am in the UK.)
per side. This allowed the blade tip straps to be connected to
the plate to give strength (On the triangle bit).
It also means that the local fab shop could cut it very easy
instead of trying to cut a circle.
Many thanks and keep up the good work.
#Post#: 631--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: October 24, 2013, 8:23 pm
---------------------------------------------------------
Just a quick welcome from Sut I am sure you will find
everybody here very willing to help!! I know I have been helped
many times
*****************************************************
DIR Previous Page
DIR Next Page