Abstract: A polyphase electric turning machine such as an alternator or an alterno-starter, particularly for a motor vehicle. The machine comprises a stator surrounding a rotor inside a case; the stator comprises a three-phase star-shaped winding and a triangular three-phase winding whose outputs are connected to rectifier bridges which are parallel mounted between the ground and a common output terminal. The two windings are received together in the recesses of the stator. The number of star-shaped winding spires and triangular winding spires in the machine is selected in such a way that the number of spires of each winding is respectively 3.