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 positioned at aradially external face of the respective inclined recesses of each barrier stream (9, 10, 11); 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 positioned at aradially external face of the respective inclined recesses of each barrier stream (9, 10, 11); 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°.