Abstract: In an electrical machine, in particular a three-phase generator, with a stator (10) fastened in a housing and with a claw pole rotor system, mounted on a shaft (2), with a first pole ring (4), configured as a magnet wheel half and tapering into claws (41), and a second pole ring (3), mechanically joined to the first pole ring (4) by a nonmagnetic joining means and tapering into claws (31), as a magnet wheel half, the respective tips of the claws (31,41) of the one pole ring (3,4) extending into the interstices between the claws (41,31) of the other pole ring (4,3), and with an exciter winding (25) associated with the pole rings (3,4) on the shaft side, in the interest of a strong, easily accessible welded join between the pole rings (3,4) the nonmagnetic joining means is a nonmagnetic plate (5) which adjoins the surface (42) of the first pole ring (4) facing away from the claws (41) of the first pole ring (4), and is joined to that surface and to the tips of the claws (31) of the second pole ring (3).

Abstract: A flywheel energy conversion device provides highly efficient conversion between kinetic and electrical energy. The flywheel produces increased output by providing armature coils in an air gap formed about the flywheel (both radial and axial embodiments are described). In preferred embodiments, field coils of a magnetic circuit are energized with DC drive current that creates homopolar flux within a rotating solid rotor having teeth cut from a flat disk. The total reluctance of the magnetic circuit and total flux remain substantially constant as the rotor rotates. The flux may travel radially outward and exit the flat disk through the teeth passing across an armature air gap. Airgap armature coils are preferably utilized in which the changing flux density (due to the rotating teeth) induces an output voltage in the coils.