I'm trying to make my own alternator & study the physics behind it.
So I have a circle of magnets rotating over 4 coils, forming a square (90 degrees each).
When I remove 3 coils from the square and only rotate magnets over 1, the coil produces ~6 volts AC.
However, with 4 coils, each coil produces only ~3 volts AC.
I even tried with 8 coils (in a circle configuration), and they seem to generate each ~1.75 volts AC.
Why is that?
The coils are connected in parallel, not series.
Each coil has between 30-40 ohms of resistance.
They are very close to each other (~ 5 mm of distance between 2 coils).
Their winding are all in the same direction, and the magnets all have the same polarity.
The coils are NOT connected to a load, only to a multimeter (1 coil at a time).
To clarify: I test the voltage 1 coil at a time using 1 multimeter. Thus, the coil being tested is not connected to the circuit, only to the multi meter.