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 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 (M) positioned on an external face of the respective recesses of each flux barrier , 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 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 (M) positioned on an external face of the respective recesses of each flux barrier , 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 . <EOS>