Hi malofito,
Other users here have commented and given you some good information. Most of them have built their own systems and they know what they are talking about, but I think that you are not yet able to understand it all.
I think that you are where some of us were many years ago. I remember when I first learned that passing a magnet over a coil could generate 'electricity', so I wound a coil and started moving a magnet over it, and I could see the needle in the old analog voltmeter jumping. That was exciting. We all have to start somewhere.
I am going to keep it simple. I hope that you will gain some knowledge from this.
Voltage from the coil depends on many things.
1 - Number of turns. If a coil has 50 turns and produces 1 volt, doubling the turns to 100 will produce 2 volts. That is only if the magnet is thick enough. Thin magnets, like the ones that you are using, will not double the voltage in the coil.
2 - The thickness of the coil wire affects only how much current (amps) can safely flow through it. Wire thickness doesn’t affect the voltage, only the number of turns does.
3 - The speed that the magnet passes over the coil affects the voltage. If the speed (RPM) is 100 and produces 1 volt, 200 RPM will produce 2 volts.
4 - Magnet strength. N-45 Neodymium is stronger than N-42. N-52 is very strong and produces the most voltage.
5 - Magnet area. If a magnet is 2 x 1, it will produce two times the voltage than a 1 x 1 magnet can produce.
6 - Magnet thickness. The thicker the magnet, up to a point, the more voltage it will induce in a coil. The flux from a thin magnet cannot reach all the way through the coil; therefore, it will not induce a lot a voltage. If the magnet is thin, adding more turns to the coil will have little effect on the voltage produced.
7 - Distance from magnet to coil. The closer the magnet passes over the coil, the higher the voltage will be.
On an axial flux alternator, you get the best performance when there are steel plates on both sides of the coil and both plates have magnets on them. You can reduce the cost by placing magnets on only one plate.
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If you have magnets on both plates, you will get be about 40% more power (watts), than having magnets on one plate only.
There has to be plates on both sides of the coil to complete the magnetic circuit. The plates must be steel (ferromagnetic). They cannot be stainless steel, aluminum or wood.
I hope that will get you started on your journey.
Ed