Wind turbine, 3 or 5 blades?

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darwenn
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by darwenn » 15/08/09, 19:58

Too expensive ? a magnet costs barely two euros on the above site, at least for the ones I think I will use. I would have for a groin 30 euros at most, it's not too dramatic yet.
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darwenn
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by darwenn » 15/08/09, 20:42

Small question in passing, for my continuous motor which gives me 6 volts at 600 rpm, which is the average it produces, if I use a voltage tripler like this diagram
http://forums.futura-sciences.com/attac ... ipleur.jpg
can it work? if I have 6 volts, 6 amps in input, I will have 18 volts in output but with what power according to you? not enough to charge a battery? or can it not work?
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loop
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by loop » 15/08/09, 21:53

Bonsoir

Nothing is lost, nothing is created etc ...

If a system absorbs a power of 6v x 6A = 36W, it will not be able to output more than 36W even if the output voltage is changed

So the output intensity will be at most 36/18 = 2 A

For the behavior of the voltage tripler connected to a 12V battery, I do not see why it would not work but is it planned for that?
Place a diode anyway to ensure that the battery will not discharge in the device.

A+
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Alain G
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by Alain G » 15/08/09, 22:33

Darwenn

A tripler like the one in the picture must be powered by an AC generator to work, it cannot run on your DC motor
:|
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darwenn
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by darwenn » 15/08/09, 23:24

Yeah, that would have been too simple ...

It would be plugged in before my regulator anyway, but if it only works for an AC input, it's a failure for the tripler idea. I will look on google if I find something like this for direct current (it seems to be called step-up dc / dc converter ...)

I will have it one day, I will have it (in the meantime I finish rewinding my alternator stator) !!!!! .
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by chatelot16 » 16/08/09, 01:07

thanks for the link on the magnet

I see about 100euro / kg
It still seems expensive to me but less worse than I thought
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darwenn
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by darwenn » 16/08/09, 07:15

Well, it also exists in direct current, we call it a boost converter.
An example here, 12v input 24v output.
http://f6csx.free.fr/PROJETS/BOOST/boost.htm

But the easiest would have been with the alternative. I could have wound my rotor accordingly, but it's too late.

Other very interesting info on boost converters, here
http://www.sonelec-musique.com/electron ... antom.html
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darwenn
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by darwenn » 16/08/09, 21:54

Well, in any case I have just finished rewinding my stator! my god it was painful, i am now suffering from a sharp bobinitis and i reel whatever i find ... : Cheesy: . So 24 turns per coil instead of the 8 originally. Not enough room to put 32. I checked the phases, no short circuit everything is ok (phew). I'll take care of the rotor. Having another identical alternator, in case my rotor modification goes badly, I will take the rotor from the second and will try to use it with the original excitation while limiting the excitation with a series resistance, so to limit blocking. I had already noticed during my first tests with an alternator, that by connecting a bulb in series on the excication, that I limited the blocking while obtaining the adequate tension of the alternator, the concern will be that the excitation will always consume . Finally I will see that later, the ideal remaining the permanent magnet.

in the photo I still have to remove the small tie wires.
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darwenn
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by darwenn » 17/08/09, 18:06

Okay, now I think I'm going to crack. I finished the alternator and corrected the way I mounted the magnets. 1 magnet per pole of the rotor, with for each magnet 1 north pole and 1 south pole alternately. I did a test, so of course my rotor is a bit barbaric, but at 300 rpm I have barely 3 volts, so yes they are ferrite magnets for my tests, but I seriously ask myself the question if neodymium will give me more than 14 volts. My propeller only turns on average at 120 rpm, with a multiplier of 3 that gives me 360 ​​rpm. I believe that this alternator will never give 14 volts at less than 400 rpm. It will give me as much as my engine at 600 rpm (6 volts). So, will neodymium change my life? I doubt it that much. Is my propeller not turning fast enough? that's what I think and that's the basis of the problem I think. Your opinion ?

Image

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Alain G
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by Alain G » 17/08/09, 18:37

good evening darwenn!

Oh dear!

You will end up being depressed, the problem is not necessarily the magnets but the precision or the space between the rotor and the stator which must be very very close to each other for a maximum of magnetic flux, but if you are too close you will have magnetic coupling which is not desired either.

As long as your life complicated, why don't you make this kind of generator which will be the most efficient and easy to achieve.


http://www.nrjrealiste.fr/eole/eole_elec.html
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