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i-lite Pardonthe english :-) This is a three-phase alternator, it generates three sine waves that are 120 degrees separated from each other. Separated means that if you think that a sine wave can be understood as turning a circle, the voltage going up on one side and down on the other, and when it reaches the highest or lowest point, it changes direction - just like a sine wave if you draw it traditionally on a timeline. Now, the separation of 120 degrees means that the three phases are evenly spread around the imaginary 360 deg. circle. That is why you have three similar wires, no plus or minus or ground at all. When the alternator turns, each wire receives one sine wave that reaches its peak voltage at one point of the turn and thus they together create three evenly pulsing voltages. The 3-phase current has to be rectified with the use of a suitable controller, as a simple solution. I hope this helps...

stéphane 25/04/2019
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