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Stator Burnout Wow!


By ibeweagle, Section Wind
Posted on Sun Nov 25th, 2007 at 05:19:20 PM MST
Stator Burnout...

Here is what happens when you put a to heavy tail on turbine magnets did not get dammaged and are all there thanks to magnet holder cut out of alum plate and epoxied enjoy will have more updates when fixed and changes first burnout in 3 years and learning P.S. pictures under my files uploaded
Stator Burnout Wow! | 20 comments (20 topical, 0 editorial)

Re: Stator Burnout Wow! (3.00 / 0) (#1)
by wdyasq on Sun Nov 25th, 2007 at 10:31:20 AM MST
(User Info)

Brilliant - files without extension names!

Ron
Adventure is just bad planning." -- Roald Amundsen



Re: Stator Burnout Wow! (3.00 / 0) (#4)
by wdyasq on Sun Nov 25th, 2007 at 12:32:21 PM MST
(User Info)





Adventure is just bad planning." -- Roald Amundsen
[ Parent ]


Re: Stator Burnout Wow! (3.00 / 0) (#5)
by wdyasq on Sun Nov 25th, 2007 at 12:34:40 PM MST
(User Info)
















Adventure is just bad planning." -- Roald Amundsen
[ Parent ]



Re: Stator Burnout Wow! (3.00 / 0) (#2)
by RogerAS (theropod at yahoo dot com) on Sun Nov 25th, 2007 at 11:09:27 AM MST
(User Info)

You must have a Mac. Some folks have trouble with files that don't have the .jpg or .gif file extension after the name.  Also those files are rather big, byte wise.

Still, I like the rotor pict. Is the aluminum sheet just floating with the steel back or is it bonded in some way?

Have fun.
RS
Roger AS
8 Years off-grid & counting



Re: Stator Burnout Wow! (3.00 / 0) (#14)
by wdyasq on Sun Nov 25th, 2007 at 07:26:50 PM MST
(User Info)

No, a real operating system, Linux. Any good OS won't open unknown files. (and, actually MAC uses a 'nix type system and is a good system.)

Ron
Adventure is just bad planning." -- Roald Amundsen
[ Parent ]



Re: Stator Burnout Wow! (3.00 / 0) (#3)
by etownlax on Sun Nov 25th, 2007 at 11:23:19 AM MST
(User Info)

Pretty Crazy...
 You see the Wires all the way around the thing. All but where they're suppose to be.lol.
It looked like it just demolished that stator. Fiberglass was just torn. prety crazy

-Randy



Re: Stator Burnout Wow! (3.00 / 0) (#6)
by Flux on Sun Nov 25th, 2007 at 12:44:56 PM MST
(User Info)

Yes that's quite impressive.

I suspect that that has been burnt out for months or even years and kept working until a loop of wire caught the magnets and ripped it apart.

Nearly all these machines are pushed too hard, I think someone should think about altering the tail pivot angle as nobody seems capable of making a tail light enough to furl safely with the suggested angle.  Using something other than half a sheet of plywood may work with the suggested angle but it seems to be the chosen material.

The heat goes down with the current squared so if you can get it to furl at 70% of the previous current it will probably survive indefinitely.

Flux

[ Parent ]



Re: Stator Burnout Wow! (3.00 / 0) (#7)
by richhagen (richhagen (a t) Juno.com) on Sun Nov 25th, 2007 at 01:07:35 PM MST
(User Info)

I was using some neodymium magnets as workpiece holders while welding.  They lose there field strength at modest temperatures.  You obviously had a bunch of wind while the stator was overheating, but still I would try to find a way to double check the strength of the magnets.  If it rubbed one or more at some point it would have likely gotten pretty hot.  Rich
'A Joule saved is a Joule made'


Re: Stator Burnout Wow! (3.00 / 0) (#9)
by Flux on Sun Nov 25th, 2007 at 02:06:36 PM MST
(User Info)

Rich I have a dreadful feeling that you will turn out to be correct. The saving grace may be that burn out has occurred over a significant time and unless the frictional heat from chewing up the copper has done more damage at the last moment the magnets may be ok.

Flux

[ Parent ]



Re: Stator Burnout Wow! (3.00 / 0) (#8)
by TomW on Sun Nov 25th, 2007 at 01:54:19 PM MST
(User Info)

All I can say is "OUCH"!

Cheers.

TomW

"Education consists mainly of what we have unlearned."--Mark Twain



Re: Stator Burnout Wow! (3.00 / 0) (#10)
by jmk on Sun Nov 25th, 2007 at 02:34:54 PM MST
(User Info)

 Ah, ooh, eh!
jmk
[ Parent ]


Re: Stator Burnout Wow! (3.00 / 0) (#11)
by cdog on Sun Nov 25th, 2007 at 03:32:08 PM MST
(User Info)

This is my worst nightmare!
After asking many stupid questions about furling, I decided to listen to Dan!
It took 9" of offset to get my tail to lift with 15lbs of force on the spindle!!!
Guess my tail must be heavy!!
I hope all goes well getting it back in action,
Cdog.


Re: Stator Burnout Wow! (3.00 / 0) (#12)
by vawtman (vawtman(at)charter(dot)net) on Sun Nov 25th, 2007 at 04:53:07 PM MST
(User Info)

Was this stator totally encapsulated with resin or a hybrid with the coil centers open for cooling.
I wouldnt think the coils would rip apart like that.
Sorry for your loss.


Re: Stator Burnout Wow! (3.00 / 0) (#13)
by Jon Miller (Fieldlines 'at' otherpower 'dot' co 'dot' uk) on Sun Nov 25th, 2007 at 05:07:14 PM MST
(User Info) http://www.otherpower.co.uk

From what I can see of the pictures, if the stator was fully encapsulated then the resin didnt penetrate into the coils much.  I reckon even super glue would have held the coils together more then in this case.

Sorry to here of the loss, lots of work :S
Jon M

www.otherpower.co.uk
[ Parent ]



Re: Stator Burnout Wow! (3.00 / 0) (#15)
by ibeweagle (ibeweagle@hotmail.com) on Sun Nov 25th, 2007 at 07:45:15 PM MST
(User Info)

update on magnets the pull on screwdriver on all magnets are the same so they are all ok or all bad but think they are ok will do more testing and pictures when I disasemble tommarow have new magnets of same grade to test out in comparison thanks Mike Johnson


Re: Stator Burnout Wow! (3.00 / 0) (#17)
by Flux on Mon Nov 26th, 2007 at 12:28:59 AM MST
(User Info)

That sounds encouraging. I think you might be lucky, it looks as though the stator disintegration was very rapid and complete and may have occurred in a few revs. When the stator stays in place and expands against the magnets then the frictional heating seems to murder them.

Flux

[ Parent ]



Re: Stator Burnout Wow! (3.00 / 0) (#16)
by coldspot on Sun Nov 25th, 2007 at 07:46:33 PM MST
(User Info)

WOW!
Bummer, sorry about your loss!!!  :(
Thanks for posting.
Please give us the offset length and tail weight & length. Blade Dia. Ect,ect.

"Using something other than half a sheet of plywood"
I'm trying much less than that at about 1.5' X 2.5' .125 thick wood painted and clear coated.(induction motor conversions 2HP)(83.5" Blades)
 Also planning on one tail built with our states, Red, White and Blue version license plates, starting with two in the front facing away from each other and then four then six. (maybe 8 at the end).
Might even start with the smaller bike/trailer ones then the full size auto ones for the rest of them.
 I think it would look pretty good and also be weather proof with light weight.  



Re: Stator Burnout Wow! (3.00 / 0) (#18)
by tecker on Mon Nov 26th, 2007 at 07:12:27 AM MST
(User Info)

When you get it back together loose that Indoor 4 spare box I'm shure it leaks big time . A dead short in that box could have put one or more phases in fuull shunt .


Re: Stator Burnout Wow! (3.00 / 0) (#19)
by tecker on Mon Nov 26th, 2007 at 07:16:30 AM MST
(User Info)

Looks like the insulation on that  pigtail from the stator to the box is deformed so good chance you had a short in that tap box .

[ Parent ]


Re: Stator Burnout Wow! (3.00 / 0) (#20)
by jmk on Mon Nov 26th, 2007 at 11:39:28 AM MST
(User Info)

{Hello all doing prototype wind turbine magnet rotors are 14 inch dual 16 magnets of 1x1x2 n40 need to fuigure out formula for turns needed for a 24 volt battery bank used Hughs formula for a 15' prop found out around 147 turns for cut in of 76.4rpm of the prop and a air gap of just over 1.125 thanks Mike ps star connected 4coils per phase}

 If this is what you went with for your alternator I would think you would need a lot more magnet flux. You are building basicly an alternator for a 12' machine except you added a lot more copper and put a 15' rotor on it. If you didn't furl real early you would have burned it up anyway. Looking at your test coil made with two in hand of #15 That is like one in hand of #13. My 12' alternator has the same magnets 32 total, but only 50 raps of #13 12 coils for 24 volts. I know you want to cut in earlier for a 15' rotor but what's to keep it from running away? Then again I don't know exactly what you did when you made your finished alternator. I am guessing from your files. It would work if your tail furls early and you don't get any heavy winds. Plus your air-gap is huge. Mine is only 11/16".
jmk



Stator Burnout Wow! | 20 comments (20 topical, 0 editorial)
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