Abstract: An alternator having a rotor which extends obliquely with respect to its axis of rotation between at least a pair of pole pieces having power windings disposed therein with the turns of the windings facing the pivotal axis of the rotor. Upon driving the rotor in rotation, the rotor due to its oblique configuration causes the flux extending with respect to the pole pieces to reciprocate with respect to the pivotal axis and the power windings, thereby producing two cycles of alternating current for each rotation of the rotor. The form of the rotor can substantially correspond to a portion of a cylinder having oppositely disposed face portions extending obliquely with respect to the central axis of the of the cylinder which is substantially coincident with the pivotal axis of the rotor. The periphery of the rotor thereby generates a cylindrical figure of revolution as the rotor is rotated.