Hello guys, I am trying to build a permanent magnet generator, I have 48 magnets and 18 coils, and I am hesitating betwen 2 configurations. Configuration A: 2 huge steel plates with 24 magnets on each and an 18 coil stator between them or Configuration B: 4 smaller plates stacked to sandwich 3 stators, same total number of magnets and coils. In theory, for both configurations, over 1 complete revolution the same number of magnets would pass over the same number of coils. Since voltage is proportional to the variation of flux in time, in config A the speed of the magnets being higher, a higher voltage is obtained, in an open circuit at least. But when I add a load current will start flowing and that would slow the rotor. In config A the force will be applied far away from the axis making it easier to slow down the rotor while in config B it will have a smaller impact since it is closer to the axis. Having said all that do you think that I would have the same efficiency for both configurations?