Rotor for a rotary electric machine and rotary electric machine comprising such a rotor

A rotor (1) of a rotary electrical machine, comprising:

• a plurality of alternating North (N) poles and South (S) poles formed from a plurality of permanent magnets (3) arranged in first recesses (4) which extend along an axis (X-X′) of said rotor (1), and are distributed regularly between a circumferential part (5) and a central part (6) of a magnetic body (2) of said rotor (1), defining a plurality of circumferential polar sections (7) Np with a predetermined polar pitch (Θp), the polar pitch being equal to 360°/Np,
• said permanent magnets (3) having a first polygonal radial section and a first axial plane of symmetry, and said circumferential polar sections (7) having a second radial section which forms a lobe (8) on the exterior and a second plane of axial symmetry, wherein the plurality of circumferential polar sections define a substantially circular radial cross section, with a plurality of said lobes (8) extending radially therefrom, wherein:
• said lobe (8) partially overlaps said permanent magnets (3) said circumferential polar sections (7) having a predetermined polar overlapping angle (Θr) with respect to said lobe, maximizing useful magnetic flux (ΦU) and minimizing magnetic leakage flux (ΦL), said polar overlapping angle (Θr) being a viewing angle defining the lobe (8) from a point of said axis (X-X′) of the rotor, said circumferential polar sections (7) having a predetermined overlapping ratio (R), said overlapping ratio (R) being equal to a ratio of said polar overlapping angle (Θr) to said predetermined polar pitch (Θp), and said overlapping ratio (R) is substantially contained between 0.35 and 0.50 and wherein said permanent magnets consist essentially of ferrite .