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Vertical Wind turbine and 3Phase alternator 9 Coils / 12 magnets

by iZe Jun 30, 2015
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If I were to guess, simply adding one magnet to the top of each existing permanent magnet should increase the power generated and ought to be a quick-and-dirty modification. Technically, it wouldn't even have to be the same magnet as long as it's oriented the same. It could be held in place by magnetic attraction alone.

You didn't indicate if the magnets are arranged like N + S, S + N or anything. If this is the case and each pair of magnets is oriented one-up + one-down, then another add-on modification would be to add a horseshoe magnet to bind the two permanent magnets in each case together. Something like this 50-lb magnet is what I'm thinking here: http://thumbs3.ebaystatic.com/d/l225/m/meD8dgvhFZs8CXBAQ5-Awcg.jpg Granted, they're expensive at perhaps $60-$90 each. https://www.kjmagnetics.com/blog.asp?p=why-horseshoes Still assuming that your magnets are oriented like this, the horseshoe add-on works better than the air-gap version that you'd be running now.

Continuing along these lines, even if you don't buy lots of horseshoe magnets you can still add an arc of iron/steel to bridge the pairs of magnets. In effect, this creates a weaker version of a horseshoe magnet, if you think about it. Google "mounting magnet" if you want to see how people add a steel piece to a magnet so that in combination, the lines of flux are stronger. Basically, you're replacing an air-bridge for the lines of flux with something that has more mass to it plus it has pieces that can be readily reoriented, like a soft/ferrous metal.

Additionally, you might consider taping a steel plate below each coil. (Imagine the lines of flux from the horseshoe magnet creating a loop down to this plate and then back to the opposite pole of the horseshoe magnet... and your coil just happens to be in the way.) Right now, your looping lines of flux are using the air below each coil to find their way "back home", if you will. So a ferrous plate (or even a complimentary pair of permanent magnets below) is a better path than air.

You should also Google "MuMetal". You might be able to create those horseshoe bridging shapes with that.

Hi All
Just some news.

The generator works correctly
But the windmill has some design flows.

The space between the blades and the center or rotation are too small and these translate into low torque.
And the diameter of pole i used is too small and this cause the structure to wobble under wind.

in the future I'll design another version of this but for now if you plan to build one consider to changhe the design to adress these issues.

Sept. 4, 2016,
What is status? Field test? Interested in wind speed needed to generate stable power.

I find your idea of making windmill and motor printable very interessing.
Any news on the output of the wind turbine in amps or watts.

Would you get more power from the coils being perpendicular to the magnets and having the opposite polarity magnets on the other side of the coil. Instead of the flat and one side as you show?
What epoxy do you use to seal the coils in place? Hy-sol, UHU or others?

I have tried also the perpendicular configuration and was very difficiult to have the magnets near the coils.
To seal the coils I've used a dielettric resin designed to seal pcb.
In EU is around 13€ for 3KG, i used about 1,5Kg.


marvelous idea,
How about 3 phase alternator need 6 rectifiers to change to DC.
Look at a car alternator. there are 3 plus and 3 negative rectifiers to make DC current.
Reason not to use car alternator is it could use 40 watts just to magnify coils.
Permanent magnets will need some way to regulate voltage.
I am not telling you how to go forward with this project, but get you to studying how alternators work.
Then there are ready made generator stuff, like starter on Briggs and Straton lawnmower engines cheap. @$100.00 for a good used one.
They have powerful permanet magnets and ready made rotors.
I believe I would consider them, cheap and available. I also think 4 blades that air will go on thru to opposite blade
and use air 2 times. If you lived near S IN,USA, I have some starters I would be glad to donate to practice on. Oh and by the way starters would need extra cooling.
Take care, Live Long and Prosper.

Hi Wayne, many thanks for your comment and your offer, but I'm from Italy and the shipment + vat will cost me a lot :)

Sure there some low rpm alternator made for DIY wind turbine on the market that are cheap but the goal of my project is to make a full wind turbine 3d printable, probably I'll make a less efficient alternator in comparison with ones designed for wind turbines but this will be open source and mostly printable on a small surface printer.

About power generation from what I know the most efficient way to make Watts is to use a 3 phase alternator and a 3 phase full wave rectifier (like car alternators), the diodes inside the rectifier will induce a voltage loss but is less of what you lose on a DC motor used as generator.

About the voltage regulation, I plan to achieve a voltage higher than 15v (around 24v@60-120 RPM) and use an MPPT circuit to charge batteries, this also will solve the voltage issue, but probably the MPPT device will cost more than the wind turbine itself.

at first i thoght u needed to rotate the inner circle, but now i realize that is stationary and you are rotating the outer ring by the vertical blades? ..

Yes, the stator is stationary the bottom join with a 90mm PVC tube, inside the tube there are an adapter for a 47mm bearing, on top of the stator there a slot for another 47mm bearings.
The main shaft is hold by the two bearing.
On the shaft one plate attach and hold the rotor.
The blades will attach to the shaft.

what exactly is the bearing type, can i get a direct link to buy it?

in theory it looks interesting - but you may have some issues to consider.

Thanks freNRG, can you better explain about the issues ?
I'm going to assemby the generator in these days and if i can avoid issues before is better :)