Axial flux alternator for a wind turbine arrangement includes at least one magnetic disk including magnets and at least one coil disk including electromagnetic assemblies. One or both disks are mounted to wind turbines such that adjacent disks rotate in opposite directions, or such that the magnets of a magnetic disk move relative to the electromagnetic assemblies of an adjacent coil disk which may move or be stationary, or vice versa. Between adjacent disks, rolling elements on one disk roll, slide or move on or against the surface of the opposite disk in order to fix and maintain air gaps between the magnets on a magnetic disk and magnetic cores of the electromagnetic assemblies on the coil disk, and thus enable continued motion and use of the alternator.