Rotor axial flow type and Lundell motor vehicle alternator comprising a rotor as

The rotor (6) according to the invention is of axial flow type, and is intended for a rotary electrical machine. The rotor includes claws (9, 10) arranged around an axial core (17) by trays (13, 14). According to the invention, the claws, the trays and the axial core are a heterogeneous magnetic circuit. According to another feature, the axial core is formed of a first magnetic material having a first relative permeability greater than the second relative permeabilities of second magnetic materials forming the claws and the plates for the same given magnetic field. According to another feature, the first magnetic material has a first magnetic induction high saturation inductions second magnetic saturation of the second magnetic materials.