Reluctance rotor having a laminated core made of a plurality of reluctance rotor laminations and a shaft, which is circular cylindrical in shape and which is connected rotatably to the laminated core by friction locking only, wherein each reluctance rotor lamination is embodied such that - it is embodied in a circular disk shape and comprises one or more d-axes, wherein each d-axis has two d-axis halves separated by the centre of the reluctance rotor lamination, having - a central opening in the centre of the reluctance rotor lamination and - in each case a flux-conducting section extending radially from the central opening to a connecting ring located on the outer edge of the reluctance rotor lamination along each d-axis half, wherein - an opening (6, 42) is arranged in each flux-conducting section on the respective d-axis half such that a partial conducting section (36, 37) is formed on each of the two sides of the respective d-axis half in the respective flux-conducting section, and - the sum of the smallest cross-section of each of the two partial conducting sections (36, 37) is greater than or equal to the smallest cross-sectional area of the flux-conducting section (36, 37) perpendicular to the respective d-axis half radially further out from the opening, - the reluctance rotor laminations are connected to the shaft exclusively in the region of the central opening so that the torque is transmitted from the rotor to the shaft solely by means of friction locking, so that the reluctance rotor comprises a circular cylindrical through-opening which serves to receive the shaft, so that the through-opening of the reluctance rotor is formed by the central openings, in order to form a cylindrical press fit, characterised in that the opening (6, 42) is an opening for mechanical stress reduction. - it is embodied in a circular disk shape and comprises one or more d-axes, wherein each d-axis has two d-axis halves separated by the centre of the reluctance rotor lamination, having - a central opening in the centre of the reluctance rotor lamination and - in each case a flux-conducting section extending radially from the central opening to a connecting ring located on the outer edge of the reluctance rotor lamination along each d-axis half, - an opening (6, 42) is arranged in each flux-conducting section on the respective d-axis half such that a partial conducting section (36, 37) is formed on each of the two sides of the respective d-axis half in the respective flux-conducting section, and - the sum of the smallest cross-section of each of the two partial conducting sections (36, 37) is greater than or equal to the smallest cross-sectional area of the flux-conducting section (36, 37) perpendicular to the respective d-axis half radially further out from the opening, - the reluctance rotor laminations are connected to the shaft exclusively in the region of the central opening so that the torque is transmitted from the rotor to the shaft solely by means of friction locking, so that the reluctance rotor comprises a circular cylindrical through-opening which serves to receive the shaft, so that the through-opening of the reluctance rotor is formed by the central openings, in order to form a cylindrical press fit, characterised in that the opening (6, 42) is an opening for mechanical stress reduction.