Make a vertical wind turbine to generator

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MatEA57
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Registration: 31/03/11, 17:53




by MatEA57 » 14/05/11, 12:56

Yes, the alternators are not bad among Americans, it does less work to make your wind turbine!

The metal coil cores as you say, it's good against parasites, but is it more designed against heating :?:

Because I see on the photo that it exceeds on the outside of the startor!
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vinzman
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by vinzman » 14/05/11, 14:41

MatEA57 wrote:Yes, the alternators are not bad among Americans, it does less work to make your wind turbine!

The metal coil cores as you say, it's good against parasites, but is it more designed against heating :?:

Because I see on the photo that it exceeds on the outside of the startor!


heat, you will also find it with the discoid. Besides, Hugh Piggot talks about it in his book. What is analyzed is the thermal conductivity of the resin in which we put the coils.
Epoxy is less recommended because it badly conducts heat. NPG Resins are better in this respect and more robust.
You will all the more increase the temperature inside your discoid stator by the fact of possibly putting a piece of fiberglass fabric in order to solidify your stator even more.
As such, because the coils of the car alternator are not caught in the resin and because they are pressed against metal (it conducts heat very well), heat dissipation is therefore better.
Another super interesting option, in the case of one of these alternators, is that you can add a cooling fan, a fan that is normally used when used next to a car engine.
You can also subsequently enlarge the holes used to extract the air in the alternator.
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MatEA57
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by MatEA57 » 14/05/11, 16:33

I saw that there are several types of resin: polyester, epoxy, polyurethane, vinylester, gel-coat ...

: Shock: it goes from the composition for soft to rigid, which would be the best choice :?:

Those who tinker with alternators take industrial talk as a charge for the resin, but it is more to save on the resin or for a certain thermal conductivity :?:
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vinzman
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by vinzman » 15/05/11, 16:38

Vinylester because it conducts heat better and is more resistant.
If you want to further facilitate the cooling of your stator, put bits of aluminum in your stator when pouring the resin.
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MatEA57
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by MatEA57 » 16/05/11, 13:21

Thanks for the info, that's a good idea!
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dedeleco
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by dedeleco » 16/05/11, 15:45

With metallic conductors in the stator, pay attention to the eddy currents, because if badly arranged, touching, too big, similar to coils in short circuit, the alternator becomes an effective brake by eddy currents !!
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vinzman
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by vinzman » 17/05/11, 05:03

Yep.
Hugh Piggott advises to put aluminum dust.
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dedeleco
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by dedeleco » 17/05/11, 13:52

Diluted aluminum dust will not change this conductivity much.
Make a test by measuring the proportions Al and then the real thermal conductivity !!
Make a calculation of heat dissipation and associated heating.
Plastic or resin with very low conductivity between particles of Al completely limits this conductivity.
Well oriented wires or sheets without mutual electrical contact are better.
The copper of the coils is the best conductor and it is better to put it in thermal contact with a radiator of Al or Cu wires outside the magnetic field.
Measurements of the magnetic field and of the conductivity make it possible to avoid errors.
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vinzman
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by vinzman » 17/05/11, 17:51

It is clear but what would be the best orientation for these pieces of metal?
I had thought for mine, as I do not put it in a corner or winds of "tornadoes" make holes there with a drill to facilitate cooling.
The other thing I did, which does not concern the rotor, is that I made 2 steel discs as light as possible.
I will put a picture to you later.
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vinzman
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by vinzman » 17/05/11, 18:18

So, as I found that the conventional construction model which is attached to the 'Piggott' type wind turbines, is designed for blade diameters of 3 meters, i.e. monsters which face higher constraints that a Lenz type wind turbine of barely 1,30 meters, I decided to lighten the discs in order to eliminate as much as possible the effort necessary to overcome the inertia that the 2 discs created.

Here is what it looks like:


Image
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