Patent ID: 7325637

Claim:
A hybrid drive device, comprising: an internal combustion engine, an energy converter adapted to co-operate with an output shaft of the internal combustion engine and which comprises at least one electric machine having a first rotor connected to the output shaft of the internal combustion engine and a second rotor connected to a drive shaft, in which the rotors are adapted to co-operate with each other by transmitting power through magnetism, in which at least one of the rotors is provided with rotor windings, and in which the device comprises an energy source adapted to exchange electrical energy with said rotor windings through an alternating voltage in said rotor windings; wherein the electric machine has said two rotors arranged with surfaces for cooperation by transmitting power through magnetism directed substantially in the direction of the axis of rotation of the rotors for substantially axial magnetic flux between the rotors; and wherein the rotor windings are adapted to be connected to a multiple phase alternating voltage for generating axial magnetic flux, wherein these rotor windings are arranged in the form of poles being concentrically wound, with the rotor windings adapted for connection to different phases of said multiple phase alternating voltage separated from each other by being wound around different pole pieces and carried out substantially in planes substantially perpendicular to said axis of rotation.