Connecting a car alternator ...

[Christophe]

For the time being I believe that I will take the stock that he had to throw in the dumpster. On the lot (a good fifteen) there may be a simpler and less rebellious than the others. (it's stupid, when he told me to choose, I took the one that shone the most like choosing an apple. If I had known I would have taken the most rotten!).

Your "stock" could interest other members of the forums, for the shipping costs of course ...
You can use the Classifieds for this: https://www.econologie.com/pa/annonces/

Hihihih must always be wary of things that shine too bright ... There is a good example currently at the Elysée I think ...

[Obelix]

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

If you haven't fueled the excitement it's normal, see Obelix's explanations. I have the same model as titiyador and I was not sure it was 12V the excitement but I strongly suspected (red wire). It's funny because on these models the 2nd excitation card is "absent" as if it had been deleted after an evolution. I even thought at first that it was broken. I do not understand pkoi it is not looped "internally" since there is a + 12V which is connected in all cases (and without diode to the knowledge)?

Do you have an Obelix idea?

Bonobo I did not know that we risked a "blockage" in under speed?

My paddle wheel project is progressing very slowly and with each advancement I put a post on the subject and you know as much as I do ...

I abandoned the idea of ​​the alternator washing machine motor because too much counter torque, high RPM and poor performance. I have spent a fair amount of time experimenting on this point.

I went on tests with a wind turbine generator loaned to me by a member of the forums (Tigger).

Hello Tof!

You think for two minutes and you find out why it's not connected live!
How do you regulate the charging current? By changing the current in the excitation.
The resitance of the electromagnet windings remaining fixed to change the current you change the excitation voltage!
If you are connected directly to donf!
If you go through the variable voltage regulator and everyone is happy!

Obelix

[Christophe]

Hi Obé!

Ah I ignored this, I thought that the arousal was regulated "internally"?

Does this mean that an electrical excitation control unit should be added for mounting an unmodified alternator on a wind turbine?

All the more reason to abandon the idea of ​​using a car alternator and make the looping modification passing the excitation to permanent magnet:
https://www.econologie.com/forums/alternateu ... t4674.html

[loop]

Hello

To come back to rewinding the alternator, here is what you need to know:
The purpose of rewinding is to place a larger number of coils in the notches of the alternator
This has the effect of increasing the no-load voltage for a given speed of rotation and a given magnetic field
If it is necessary to reduce the section of the wire to place as much as possible (this is often the case) the resistance of the armature increases and the maximum power decreases accordingly.
Redoing a three-phase winding is preferable, and in complete coils (and not in half-turns like certain alternators).

I await your comments before continuing

A+

[Grelinette]

Thank you Looping for these details!
That said, true to one of my first remarks as soon as you tackled the technical aspects like this one:

Redoing a three-phase winding is preferable, and in complete coils (and not in half-turns like certain alternators).

... I think of titiyador and I (and surely many others) immediately get off the train and go straight into the background!

Do you think we can get started like this in:
1) disassembly of the alternator
2) unwinding of the original wire (it must be unsoldered)
3) Rewind with a longer and finer thread (and reweld)

Isn't investing in longer and thinner copper wire (besides where we find it?) Risky and expensive for neophytes like us.

Can't we go back to the basic idea:
How to operate the best a car alternator without modifying it ?

Especially since if I understood correctly, in the end, you dropped this solution to choose that of another commercial alternator (what if not a car?) More suitable for wind power! ...

[Christophe]

Am not a specialist but even transform the alternator as much pass it into permanent magnets to avoid any complications of the armature right?

[Alain G]

Hi friends

It's not complicated

You must use a car battery or others, connect the threaded terminal to the positive of the battery and the negative of the battery to
the alternator case, rotate the alternator and with another wire coming from the positive of the battery or the threaded terminal touch and remove one of the two fork terminals of the alternator and the excitation will be done.
Note that the two fork terminals are one for the amperage gauge and the other for the excitation.

Note also that varying the excitation will not change the load on the alternator since as soon as the excitation is started you can disconnect and the charge continues.

Here

So do not return your alternator without trying this.

Alain

[Grelinette]

Thank you Alain G. for this ultimate clarification.

It seems that we finally have a concrete methodology for operating a car alternator. It remains to test all of this and imagine a small mechanical system which performs the excitation contact as soon as the alternator starts to rotate, driven by a wind turbine for example.

You see a little: it took no less than 3 pages of answers to have the solution to a conundrum as simple as operating a car alternator ... It's not easy econology!

Fortunately, "From discussion springs light", as the saying goes. Provided that it is now from the alternator that the light can shine!

[Alain G]

Ha yes I forgot a very important thing which makes that nobody uses an alternator in generator on wind turbine.

The sudden shutdown of the wind turbine due to the high top load can be compensated by using a 12 volt bulb or a resistor between the battery and the alternator (in series, test with different power.

With a simple electronic circuit found on the web you can use the speed of rotation to engage several resistance in parallel to manage the speed and the load.

For Wind Turbine:
With a lap counter a relay can activate the excitation at 1000trm
2500trm engagement of the first resistance
2700trm engagement of the second resistance
2900trm engagement of the third resistance
3100trm engagement of the fourth resistance
Here is a variable load system.

for Christophe the load is stable therefore, use the right resistance (light) from the start.

Bonne chance.

[bobono]

Wiper motor you turn the crank by hand after connecting the two wires to a 12-volt pilot light bulb and you light up


A car alternator cannot work for wind turbines due to couning. Even with permanent magnets this poses problems in order to limit this problem. A difference between the number of coils and the number of permanent magnets is necessary.