Build a very low speed DC generator

[Christophe]

I said derivative in the "design" because at first glance they are similar for non-specialists (winding, brushes ...) ...

But we are not going to make a cheese on a () if?

[boubka]

a universal is a continuous series or parallel motor that we use in alternating as in continuous and the principle of reversibility is valid for him as for all the others ..... that's all

[boubka]

But we are not going to make a cheese on a () if?

no but the problem is that when everyone mixes everything we don't understand anything anymore.
it was to know what we are talking about ....

[Christophe]

I agree but I didn't say universal = asynchronous I said "derivative" ...

That's all...

[boubka]

I agree but I didn't say universal = asynchronous I said "derivative" ...

then you must say universal = synchronous "derivative" ...

[Christophe]

Okay! I promise I would do more!

[Alain G]

Hello everyone!

Christophe a universal motor is not designed to be generator, therefore the efficiency will not be there and in addition you must absolutely feed the excitation, just as you must use the stator on a DC motor which is not equipped with permanent magnets.

Why make it complicated when it can be simple?

I postpone my post on page 2 of this subject to benefit members of the forum

As I have already mentioned on some occasions when the alternator is excited once by a simple contact of 1 or 2 seconds between the excitation wire and the positive of the battery, after it produces without stopping until 'it stops spinning simply because the magnetic field is self-sustaining in AC

I hope I don't have to repeat myself over 100 times! LOL Mr. Green

The transformer solution that André raises can also be considered, by excluding the regulator but with three transformers for the three phases or by connecting 3 capacitors to the diode bridges (voltage tripler) as mentioned in response to Christophe above. Christophe your 5-6 volts can give you 15-18 volts which with a charge will drop to 14-14.5 depending on the couple which will regulate by itself.

Rewinding an alternator is an unnecessary waste of time, anyway as Elephant mentioned and he is right, rewinding will not give more watts at output but will convert amps into voltage.

Please stop thinking about it and believe everything that is said on the web, several solutions are possible but not always the simplest.

You don't have to be afraid to put a strap on it for the tests and thus be able to use the best output rpm. To make complicated to have the maximum output is to give up after a certain time because you will not have the desired yield.

So make it simple and less effective but use 2, 3, 4 or even more for a total return that will make you smile because you will have the satisfaction of saying: it almost cost me nothing and I did not invest my family in the same time if the yield is not TOP.

An alternator taken for scrap costs almost nothing and that is recovery, anyway it will end up at the scrap yard. You do like me by asking for a model which surely will not sell, I got mine for 20 $ Cdn without taxes. We can also put several to provide more power.

[Christophe]

Christophe a universal motor is not designed to be generator, therefore the efficiency will not be there and in addition you must absolutely feed the excitation, just as you must use the stator on a DC motor which is not equipped with permanent magnets.

Yes yes you are right, it was the conclusion of the 1st tests (which you had followed I believe): we had talked about 50% of generator output and in the best case 30% of the power is used for excitation ! So not good, see link above.

[the boulle]

it is true it must be understood that our primary force (wind or water) has a variable force therefore not good to spoil this force for the excitement which deplur risks causing the wind turbine or the wheel to stall ...

[Alain G]

The alternator, freed from its regulator associated with the correct torque, will self-regulate by itself without blocking it. If there is blockage it is that the proportion torque versus rpm is inadequate.