Windmill production with auto alternator?

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dedeleco
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by dedeleco » 01/07/11, 16:37

Except that the voltage is proportional to the speed of passage of the magnets and therefore if rotation too slow with too few magnets, the voltage will be rikiki below that of the battery with that of the diode (0,7V) in addition! !
In this case it is necessary to increase the number of turns of the coil in the volume where the magnet gives a large field, with thinner wire which decreases the power.
So we have to carefully calculate everything , otherwise surprises and errors !!

On econology I gave answers to the calculations (induction law).

https://www.econologie.com/forums/post199142.html#199142
https://www.econologie.com/forums/post199084.html#199084

https://www.econologie.com/forums/post199360.html#199360
https://www.econologie.com/forums/post199829.html#199829
https://www.econologie.com/forums/post199711.html#199711
https://www.econologie.com/forums/post199638.html#199638
https://www.econologie.com/forums/post199430.html#199430


Job well done but different:
https://www.econologie.com/forums/post202480.html#202480


but to want to design yourself, you have to learn the basics, and do the necessary design work, a pretty big effort !!

Trying with tests on a coil and magnets and an oscilloscope, avoids errors.
Last edited by dedeleco the 01 / 07 / 11, 16: 55, 1 edited once.
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Gaston
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by Gaston » 01/07/11, 16:39

dedeleco wrote:Except that the voltage is proportional to the speed of passage of the magnets and therefore if rotation too slow with too few magnets, the voltage will be rikiki below that of the battery with that of the diode (0,7V) in addition! !
In this case it is necessary to increase the number of turns of the coil in the volume where the magnet gives a large field, with thinner wire which decreases the power.
So we have to carefully calculate everything , otherwise surprises and errors !!
Absolutely.
And as it is quite difficult like that, no need to add a frequency constraint ...
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val.du.12@hotmail.fr
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I learn econologic
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Registration: 09/06/11, 21:35
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by val.du.12@hotmail.fr » 01/07/11, 16:44

with its coil characteristics:
9 double drive bobbins
Wire = diam 0.81 mm
lap number 70
thickness 5mm

is it's loving:
http://www.supermagnete.fr/S-15-08-N

at around 200 rpm how much can we hope for power and volts? thank you
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dedeleco
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Registration: 16/01/10, 01:19
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by dedeleco » 01/07/11, 17:14

with its coil characteristics:
9 double drive bobbins
Wire = diam 0.81 mm
lap number 70
thickness 5mm

is it's loving:
http://www.supermagnete.fr/S-15-08-N

at around 200 rpm how much can we hope for power and volts? thank you

I gave the formulas and try to understand, instead of waiting for the chicken all roasted with false values, because the calculations are too simplistic, without taking into account the speed of the magnets (rotor diameter and number of magnets), coil diameter, its distance from the magnet (air gap), from value of the magnetic field as a function of the distance to the magnet and its axis, etc.

So it is also important to measure this voltage by quickly moving a test coil in front of the magnet and an oscilloscope.

If you do not make the effort to understand and do the necessary work (measurements also on oscilloscope), you will have only more or less valid advice, sometimes false, but nobody to tire you in your place.

Also check that your coil with its wire is not impossible to achieve for the volume of your magnet (D = 15) which has decreased !!


70 turns on D = 15 of 0,81mm wire on 5mm thick at the wrong point hardly achievable !!
Try !!
At best, many turns will be totally useless seeing a zero flow !!

Reason to be concrete with your feet on the ground with theory !!
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