Kromrey device - Alternator

Kromrey Device could be an alternator for car use. It needs 4 poles rather than 3 pole which typically being used in alternator. The gap between the two coils is where the energy comes in. The stator must not be magnetic. It is very tempting to use 12V fan to become Kromrey device. But one has to aware that it should not have the magnetic flux from the magnet to loop back. Perhaps making 2 pole fan would be better.