Charge a battery with pc fans?

Renewable energies except solar electric or thermal (seeforums dedicated below): wind turbines, energy from the sea, hydraulic and hydroelectricity, biomass, biogas, deep geothermal energy ...
Tagor
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by Tagor » 16/01/08, 10:52

Christophe wrote:Ah ... I had always been taught that it was a DC generator ...

no it's alternative
here you will find everything for the use of this alternator
(including transformation into a wind turbine)
http://www.tunecharger.com/eclairage_velo_052.htm

and the link to a very efficient hub generator
which I link to, but it is on the site
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by Christophe » 16/01/08, 11:27

Pfff are really bad the teachers once ...
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by Tagor » 16/01/08, 11:40

Christophe wrote:Pfff are really bad the teachers once ...


yes more
they would be very surprised to see the experiences
on magnetic motors right now!
how would they explain this acceleration?
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by Christophe » 16/01/08, 11:45

Sorry I'm not the subject in detail ... :?

What are you talking about precisely (there are 3 on the magnetic motors that are running at the moment)?
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by Tagor » 16/01/08, 13:36

Christophe wrote:Sorry I'm not the subject in detail ... :?

What are you talking about precisely (there are 3 on the magnetic motors that are running at the moment)?


this is the principle of the OC MPMM engine

whose duplication is here fully described by CLaNZeR
day after day he mentions his improvements

http://peswiki.com/index.php/OS:MPMM:Re ... ns:CLaNZeR
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by Former Oceano » 16/01/08, 19:36

Going back to the frequency of the dynamo, 5Hz seems really too low.

I'm going to take my mountain bike. To study this, without oscilloscope or frequency meter, I will try to calculate this at best ...

The developed wheel is precisely 2,045 m (I measured it precisely to calibrate my electronic meter).

At 25 km / h, the wheel will make 25 / 000 / 2,045 = 3600 revolutions per second.

The diameter of the head of the dynamo is 2,02 cm (measured with the caliper). Each time it travels, it travels ft.D cm on the sidewall of the tire, or 6,346 cm per revolution.

It is applied on the sidewall at 32 cm from the axis of the wheel. One wheel revolution represents 2.pi.R or 2,011 m.

The head of the wheel therefore makes 201,1 / 6,346 = 31,7 revolutions per wheel revolution.

At 25 km / h, the dynamo rotates at 3,4x31,7 = 107,78 revolutions per second, roughly 108 revolutions per second.

The frequency can only be a multiple of 108 Hz depending on the number of elements making up the internal winding of the dynamo.

Either 108Hz or 216 Hz or n.108Hz ...

In short in the case of my ATV, the frequency would be:
(nv31,7) / (2,045.3,6) Hz where v = speed in km / h and n = nb coil elements, 1 2 or 3.

To do the 5 Hz announced with my dynamo and n = 1, my mountain bike should advance at 1,16 km / h.
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by Leo Maximus » 16/01/08, 19:51

FYI, the alternative signal provided by a standard bicycle dynamo:
Image
The bicycle dynamo is not very interesting as a generator because it is, by construction, self-limited in order to preserve the low-power tungsten lamps of bikes of 2,4 watts at the front and 0,6 watts at the back. Beyond 10 km / h the energy supplied is almost constant. One can nevertheless have a charging current of 0,4 to 0,5 amps at most which is interesting.

It would be better to use a modified car alternator by installing permanent magnets.
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by jonule » 17/01/08, 09:03

Leo Maximus wrote:It would be better to use a modified car alternator by installing permanent magnets.

Hello,
would you have a link on the procedure to follow?
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by Leo Maximus » 17/01/08, 11:12

jonule wrote:
Leo Maximus wrote:It would be better to use a modified car alternator by installing permanent magnets.

Hello,
would you have a link on the procedure to follow?

You should try to do a careful search on google in French, English, German, Japanese. Not too much time ...
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by loop » 17/01/08, 12:27

Hello

Jonule wrote
yes but it's still crazy time!

short for use for something that was not designed for (wind generator) better build it yourself



As I wrote in a previous post, I carried out the modification of a Bosch 50A alternator by replacing the rotor and by rewinding the stator
First tests soon
Jonule, should you know if that really interests you?
In this case I can post photos

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