Connecting a car alternator ...

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titiyador
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Connecting a car alternator ...




by titiyador » 26/01/09, 21:22

Hello everyone! What a pleasure to find a site like this one, devoting as much to renewable energies! Warmly thank their authors!

Well here, I am currently bored on one point: I try to build a mini wind turbine not necessarily by need (although it could be used to heat or light a small greenhouse where I breed critters ...), but more for fun challenge and taste of adventure.
I bought yesterday a car alternator (AX which I do not have the intensity, so I can not determine its power).

So we come to my problem: I do not know how to connect this alternator, ie what are the poles where we connect + and - son, and after, how to connect the energy produced batteries? I did not specify, but I am new to the subject and I hope to learn a lot thanks to you ...

I enclose a photo of the alternator in question, hoping that the quality (mediocre) is sufficient ... :-)

Thank you all in advance for your responses!!

Tim.

Image
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by Christophe » 26/01/09, 21:48

Ben not very complicated to connect: the more, the less and the excitement at the top (on the most battery to confirm). If it is not indicated, you take a voltmeter to test in rotation which is +/-

I do not know pkoi it's not connected internally ... I can say maybe stupid ...

But a car alternator is not the ideal solution for a wind turbine, here's what you should do: https://www.econologie.com/forums/alternateu ... t4674.html
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by titiyador » 26/01/09, 23:37

Thank you for your answer. But as I said above, I am a neophyte in the electrical field ...

So I did not understand much ...

As for the wind turbine, I will use a big multiplication ratio between the blades and the alternator with a set of pulleys and belts, so I will get a good number of rpm.

So I can connect the alternator (where is the most (left on the picture or right (threaded rod)? And the least is on the other threaded rod?)) Directly on the batteries without other equipment?

the batteries will not empty if they are connected to the alternator? because the alternator will also pump the batteries energy? (energy sent to the batteries can be returned to the alternator or not?)

What is the excitement of the alternator for? (to start it if I understood correctly)

how does one branch (if it is necessary to use it ...)
Would not a large number of alternator rpm be enough to produce electricity without using excitation?

Thank you for your answers and excuse my little electronic knowledge! but you have to start well, I ask all the questions that go through my head !!

Tim
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by Christophe » 26/01/09, 23:44

titiyador wrote:So I can connect the alternator (where is the most (left on the picture or right (threaded rod)? And the least is on the other threaded rod?)) Directly on the batteries without other equipment?


When you have identified the + and the - yes you can because the voltage regulator of the alternator is usually integrated into the alternator: you will never exceed the 14.5 Volts so ...

titiyador wrote:the batteries will not empty if they are connected to the alternator? because the alternator will also pump the batteries energy? (energy sent to the batteries can be returned to the alternator or not?)


Well no ... It's an alternator, not an engine ...

titiyador wrote:What is the excitement of the alternator for? (to start it if I understood correctly)


Not at all, it is used to create the inductive field on the rotor, in other words: to create a variable electromagnet

titiyador wrote:how does one branch (if it is necessary to use it ...) Would not a large number of rpm of the alternator be enough to produce electricity without using the excitation?


Without excitement, an alternator will never give you anything ...

Anyway it is included it is not a problem for you so ...

titiyador wrote:Thank you for your answers and excuse my little electronic knowledge! but you have to start well, I ask all the questions that go through my head !!


No need to apologize, I am also (re) learning all this ...

Cf: https://www.econologie.com/forums/tambour-de ... t6303.html
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Car alternator connection




by bobono » 27/01/09, 00:15

Answer that does not work.

The excitation of the rotor ends up blocking the alternator. On a car this does not happen because the speed of rotation is sufficient but on a wind turbine or the speed of rotation is not sufficient the blockage occurs.

It is quite easy to replicate the experience by driving the alternator with a drill and giving the + the excitement.
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by titiyador » 27/01/09, 08:41

A big thank you Christophe for your clarification! I went to see the link that you posted. Your project is very attractive !! How is it evolving? Did you succeed ?

Regarding the first link you proposed to me, this is a person who rewind an alternator? But despite all the sites that I could find on the subject, I found none that details the operation enough to guide me step by step. Otherwise I am quite ready to try (but I do not know the formulas, which wire to use ...)

Bobono, on your side, you say "it does not work". Are you talking about the alternator? What happens when the alternator hangs? Can it unlock if the wind turbine turns faster? (Because it will inevitably hang immediately (when starting the wind turbine, it does not turn fast enough)

If you know sites that detail the rewinding of alternators, I'm interested !!

Thank you very much !!!
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by Grelinette » 27/01/09, 09:25

Thank you titiyador for resting basic questions, simple and whose answers still remain unclear and uncertain !
For the rewinding of the alternator, it seems that it is not an operation as easy as that. Many specialists advise against it if you are not well equipped and with strong connoisseurs in the field. :|

To go back to the basic project, I think we should not skip the steps. Titiyador "trying to build a mini wind turbine not necessarily out of need…, but more for the pleasure of a challenge and a taste for adventure"and that's also my case and I'm not trying to build a mega-power plant either. : Cheesy:

Even if it's not the best of the best cream of the gratin of the best, can one still have a simple assembly to build an electrical production system from an alternator?
In a second time, if needed, the system can be optimized.

In short, to return to the alternator:

- identification of + and -? Not being a specialist (but possessor of an alternator and a wind turbine that I would like to couple : Cheesy: ), I just imagine connecting a simple voltmeter (a few euros in large area) on the terminals, rotate the alternator and see in what direction the needle moves the voltmeter ... Moreover a new question stupid but concrete: is there a direction of rotation of the alternator and the poles are reversed with the direction of rotation ????
it seems con as a question but for a neophyte is the BA BA. : Shock: (Of course I have to try and see you can tell me ... but one who knows is better than 10 looking! ...)

- I'm sorry to do the service ball :P but I still have not understood the story of the excitement of the alternator!
Christophe wrote:Without excitement, an alternator will never give you anything ... Anyway it is included it is not a problem for you so ...

Clearly, it works or it does not work?

Well, on that, I start: I will quickly rotate my alternator with a drill (in the direction 2) and see what he said to the voltmeter and come back to tell you ....
Last edited by Grelinette the 27 / 01 / 09, 09: 51, 1 edited once.
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by Grelinette » 27/01/09, 09:39

Result of my test: voltmeter connected to the alternator trained with a drill: nothing, total nothing, whatever the direction of rotation : Cry:

Image

but my alternator is perhaps HS, how to know it?

Moreover, finally, the first question to ask is how to simply test the running of an alternator?

help, help ...
Last edited by Grelinette the 27 / 01 / 09, 10: 08, 2 edited once.
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by titiyador » 27/01/09, 09:40

Hello Grelinette, thank you for your support : Cheesy: !!!

I am looking forward to the results of your measurements!
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by titiyador » 27/01/09, 10:13

Re Grelinette,

You answered faster than me !!

I have the same worries. Yesterday evening, I ran my alternator with a drill, and I connected a bulb 12 v, it did not give anything. Yet I tried everything: the threaded rods, the place where there is what is called the excitement of the device, but nothing.

So we are in the same case, either our alternators are both HS (it would be really bad luck), or we take it wrong! (I lean rather for this possibility ...)

If anyone knows about it, we welcome it with open arms !!

Goods.
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