Rotor for electric machine, the rotor includes: - a rotor body , formed by a stack of sheets , placed on a rotor shaft and - eight magnetic poles, each magnetic pole is composed of at least three magnets positioned in axial recesses and - three asymmetric flux barriers which make up each magnetic pole including an external flux barrier , a central flux barrier and an internal flux barrier , each flux barrier (9, 10, 1 1) comprises two inclined recesses positioned on either side of each axial recess , the two inclined recesses form between them an opening angle (Θ1, Θ2, Θ3) which corresponds to the angle between two straight lines (Δ1, Δ2) each passing through the center C of the rotor and through a midpoint (M) positioned at aradially external face of the respective inclined recesses of each barrier stream ; characterized in that - the eight magnetic poles are divided into four primary magnetic poles and four secondary magnetic poles and - the four primary magnetic poles are each composed of an external flux barrier comprising an opening angle (Θ1) substantially equal to 43.1°, of a central flux barrier comprising an angle opening (Θ2) substantially equal to 33.1° and an internal flow barrier (1 1) comprising an opening angle (Θ3) substantially equal to 23.1° and - the four secondary magnetic poles are each composed of an external flux barrier comprising an opening angle (Θ1) substantially equal to 34.4°, of a central flux barrier comprising an angle opening (Θ2) substantially equal to 24.4° and an internal flow barrier comprising an opening angle (Θ3) substantially equal to 14.4° and - each secondary pole is alternated with a primary pole and - a difference between the opening angles (Θ1, Θ2, Θ3) of each respective flux barrier (9, 10, 1 1) from a primary magnetic pole to a secondary magnetic pole is equal to 8.7°. - a rotor body , formed by a stack of sheets , placed on a rotor shaft and - eight magnetic poles, each magnetic pole is composed of at least three magnets positioned in axial recesses and - three asymmetric flux barriers which make up each magnetic pole including an external flux barrier , a central flux barrier and an internal flux barrier , each flux barrier (9, 10, 1 1) comprises two inclined recesses positioned on either side of each axial recess , the two inclined recesses form between them an opening angle (Θ1, Θ2, Θ3) which corresponds to the angle between two straight lines (Δ1, Δ2) each passing through the center C of the rotor and through a midpoint (M) positioned at aradially external face of the respective inclined recesses of each barrier stream ; characterized in that - the eight magnetic poles are divided into four primary magnetic poles and four secondary magnetic poles and - the four primary magnetic poles are each composed of an external flux barrier comprising an opening angle (Θ1) substantially equal to 43.1°, of a central flux barrier comprising an angle opening (Θ2) substantially equal to 33.1° and an internal flow barrier (1 1) comprising an opening angle (Θ3) substantially equal to 23.1° and - the four secondary magnetic poles are each composed of an external flux barrier comprising an opening angle (Θ1) substantially equal to 34.4°, of a central flux barrier comprising an angle opening (Θ2) substantially equal to 24.4° and an internal flow barrier comprising an opening angle (Θ3) substantially equal to 14.4° and - each secondary pole is alternated with a primary pole and - a difference between the opening angles (Θ1, Θ2, Θ3) of each respective flux barrier (9, 10, 1 1) from a primary magnetic pole to a secondary magnetic pole is equal to 8.7°. <EOS>