I think there is only one “magnet,” which pretty much encompasses the whole inner part of the flywheel center. As the N side of the magnet approaches one trigger coil, current builds in one direction. As it passes the coil, the current direction changes and it flows in the other. 180 degrees of flywheel rotation from this event, the same thing happens; but instead of the N pole approaching and passing, this time it is the S pole. The different pole means the current starts and finishes going in opposite directions from what the N pole would create. The switch box sees all this and has circuitry that will fire each coil, based on which way the change of direction occurs. My apologies; I am just a mechanic, not an engineer, by any stretch.I am sure an engineer could explain it better.
Long live American manufacturing!
