A rotor of an electric motor with permanent magnets includes a pack of laminations made of ferromagnetic material with slots for the permanent magnets which are arranged radially with respect to the rotation axis and are extended parallel thereto. The permanent magnets are magnetized along a direction that is perpendicular to the radius of the rotor. Each lamination of the lamination pack further includes poles between the permanent magnets that are rotated in a given direction and by a given angle with respect to the corresponding poles of the adjacent laminations.