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If you have two magnetic fields in opposing direction and these are moved past a conducter they will produce current in opposite directions hence no electricity will be produced, it may produce a small current because differences in field strength and each magnets proximity to the coil.
Just a singular magnet in a coil will want to maintain it's position when the circuit is closed, the only issue is it would have strongest resistance in it's centre position and would lose strength as the field moves out of the coil ends.
Using a magnet between two coils may be the best idea, it could be a continuous coil but I think winding has to be reversed so current generated always flows in same direction, or each coil could go to bridge rectifier and then to a charge controller.
The biggest problem lies in the variability of voltage produced because of the infinite range of movements (speed and distance) possible, this is one of the biggest problems with usinging renewable energy sources effectively.
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