Can This Rotor Work?

[dom]

Hi guys.

I am new here, its a great site.

I'm about to make with a friend this rotor for a vawt:

http://img136.imageshack.us/img136/6895/rotor1ate3.jpg

http://img132.imageshack.us/img132/525/rotor1bni5.jpg

http://img136.imageshack.us/img136/6591/rotor1czb0.jpg

Do u think it might work?

i already have the rings and the magnets.

Thanks.

[Tritium]

From the way it is drawn I take it is  a single phase machine?

Thurmond

[dom]

Yes.

It might be 3 phase too.

The question is, do we realy need the second (outer) ring?

With the second ring we try to increase flux.

We think we'll have cogging problems with the 2 rings.

Sorry for my poor English.

Jim

[ghurd]

The second ring adds a lot of power.

The design will not cog.  Unless there is iron in the coil ring.

G-

[SparWeb]

I was with you, until I saw the spindly arms holding it together.  Try something more solid to hold the rings together, big enough to resist torque, shocks, vibration, weather, etc.

Do you have a plan of how to make the stator hold the annulus of coils?  The stator, too, must be solid enough to withstand the motor's torque.

I bet you've been inspired by Vawtman?  (If not, FYI he's a fellow forum member.  Look him up, he's building something similar).

Good luck.

[dom]

Actualy, we had in mind something like my car wheel, something like this:

http://img212.imageshack.us/img212/7366/zantaee0.jpg

A few days ago i read some posts, some of them vawtman's posts and i learned much.

I'll try to find his posts.

We are making the rotor this way (double ring) trying to decrease the weight of it by not using

steel plates.

The metal pieces wich hold the rings together are very strong and the system is very

stable and light, hopfully it may turn easy.

The stator is not a problem.

We were looking here in this site for gap issues, gap between rings, dont know much how

to find the best gap, how to calculate it and we work with trial - error method.

I am new here, i'm sure some posts exist but its hard work digging posts.

Anyway, thanx for your answers.

[ghurd]

Forgive me V-Man.

Vawtman's photos that may be interesting.

G-

http://www.otherpower.com/images/scimages/5119/mags_on_2.jpg

http://www.otherpower.com/images/scimages/5119/mag_set.jpg

I believe those are popsicle sticks.

[vawtman]

 Hi Dom

 You should use steel for both bands but you can leave the outer band naked(no mags)and still work great.

 http://www.thebackshed.com/windmill/forum1/forum_posts.asp?TID=1218&PN=6&TPN=2

 The simulation is done for a .5in gap between the outer surface of the mags and the outer band that turns with the main rotor.No cogging and you can adjust the outer band to match the turbine the best you can.

 A great guy Peter(dinges) did a flux simulation for me awhile back.If the bands were aluminum you would see the flux lines jumping from mag to mag alot(leakage flux)I decided to go with 54pls over 66 to reduce leakage flux.Not sure how bigga deal it would be but cheaper :)Steel is very important in these either axial or radial.I like the flywheel effect from the extra weight in gusty conditions anywho.

 You say the stator is easy.I'm open to your thoughts for mounting.I have ideas of attaching it to the tower but not that far yet.

 Feel free to ask ?'s of me or the great members here.My paragraghs gotta bit messed up(sorry teacher)LOL

 Mark

[dom]

Thank you all for your help.

I have to read carefully the post you told me.

From a first view, Peter's job with the flux simulation answers most of my questions about gap.

Thanx Mark, about the stator we ll talk in a few days.

Merry Xmas to everybody.