Rotor for an electric machine, the rotor comprising: - a rotor body, formed by a stack of laminations, which is preferably placed on a rotor shaft, and - N pairs of magnetic poles, each magnetic pole being made up of at least three magnets positioned in axial recesses, and - three asymmetric flux barriers which make up each magnetic pole, and which are an external flux barrier, a central flux barrier and an internal flux barrier, each flux barrier (9, 10, 11) comprising two inclined recesses positioned one on each side of each axial recess, the two inclined recesses making between them a divergence angle (θ1, θ2, θ3) which corresponds to the angle between two straight lines (Δ1, Δ2) each passing through the centre C of the rotor and through a midpoint positioned on an external face of the respective recesses of each flux barrier (9, 10, 11), P being the pole pitch of said rotor, defined in degrees as P = 360 2 × N; characterized in that said rotor comprises: - N primary magnetic poles each made up of an internal flux barrier having a divergence angle (θ1), of a central flux barrier having a divergence angle (θ2), and an external flux barrier having a divergence angle (θ3), such that the divergence angles (θ1, θ2, θ3) satisfy at least two of the following three equations: θ1 = (0.905 ± 0.027) × P, θ2 = (0.683 ± 0.027) × P, θ3 = (0.416 ± 0.027) × P, - N secondary magnetic poles each made up of an internal flux barrier having a divergence angle (θ1), of a central flux barrier having a divergence angle (θ2), and an external flux barrier having a divergence angle (θ3), such that the divergence angles (θ1, θ2, θ3) satisfy at least two of the following three equations: θ1 = (0.819 ± 0.027) × P, θ2 = (0.601 ± 0.027) × P, θ3 = (0.373 ± 0.027) × P, each secondary pole alternating with a primary pole. - a rotor body, formed by a stack of laminations, which is preferably placed on a rotor shaft, and - N pairs of magnetic poles, each magnetic pole being made up of at least three magnets positioned in axial recesses, and - three asymmetric flux barriers which make up each magnetic pole, and which are an external flux barrier, a central flux barrier and an internal flux barrier, each flux barrier (9, 10, 11) comprising two inclined recesses positioned one on each side of each axial recess, the two inclined recesses making between them a divergence angle (θ1, θ2, θ3) which corresponds to the angle between two straight lines (Δ1, Δ2) each passing through the centre C of the rotor and through a midpoint positioned on an external face of the respective recesses of each flux barrier (9, 10, 11), P being the pole pitch of said rotor, defined in degrees as P = 360 2 × N; - N primary magnetic poles each made up of an internal flux barrier having a divergence angle (θ1), of a central flux barrier having a divergence angle (θ2), and an external flux barrier having a divergence angle (θ3), such that the divergence angles (θ1, θ2, θ3) satisfy at least two of the following three equations: θ1 = (0.905 ± 0.027) × P, θ2 = (0.683 ± 0.027) × P, θ3 = (0.416 ± 0.027) × P, - N secondary magnetic poles each made up of an internal flux barrier having a divergence angle (θ1), of a central flux barrier having a divergence angle (θ2), and an external flux barrier having a divergence angle (θ3), such that the divergence angles (θ1, θ2, θ3) satisfy at least two of the following three equations: θ1 = (0.819 ± 0.027) × P, θ2 = (0.601 ± 0.027) × P, θ3 = (0.373 ± 0.027) × P, each secondary pole alternating with a primary pole.