An internal rotor for an electric motor, which internal rotor has a laminated rotor core (200; 600) with a multiplicity of rotor plates, which laminated rotor core (200; 600) has multiple pockets in each of which a rotor magnet (221; 621) is at least partially arranged, which rotor plates have first recesses (211; 611) for forming the pockets, which rotor plates have at least a first rotor plate having a first contour and at least a second rotor plate having a second contour, which first rotor plate has at least a second recess (230; 231-236; 631), which second recess (230; 231-236; 631) is associated with a first recess (211-216; 611), wherein the ratio of the angular extent (phi_R2) of the second recess (230; 231-236; 631) to the angular extent (phi_RM) of the associated rotor magnet (221; 621) is in the range of 0.4 to 0.8, and wherein, between the second recess (230; 231-236; 631) and the associated first recess (211-216; 611), a sprung web-shaped clamping element (291; 691) is formed, which clamping element (291; 691) is tensioned toward the second recess (231-236; 631) during insertion of the associated rotor magnet (221, 621) in the first recess, and which clamping element (291; 691) as a result applies a force to the associated rotor magnet (221; 621) toward the first recess (211-216; 611) in order to hold the associated rotor magnet (221; 621) in the pocket, wherein the second contour covers the first contour in the area of the second recess at least in sections, characterized in that the second rotor plate at least partially covers the clamping element (291; 691), in order to limit in this manner, in an arrangement of the second rotor plate on the first rotor plate, a movement of the clamping element (291; 691) of the first rotor plate in an axial direction toward the second rotor plate, while however allowing a movement of the clamping element (291; 691) in a direction perpendicular to the axial direction. which internal rotor has a laminated rotor core (200; 600) with a multiplicity of rotor plates, which laminated rotor core (200; 600) has multiple pockets in each of which a rotor magnet (221; 621) is at least partially arranged, which rotor plates have first recesses (211; 611) for forming the pockets, which rotor plates have at least a first rotor plate having a first contour and at least a second rotor plate having a second contour, which first rotor plate has at least a second recess (230; 231-236; 631), which second recess (230; 231-236; 631) is associated with a first recess (211-216; 611), wherein the ratio of the angular extent (phi_R2) of the second recess (230; 231-236; 631) to the angular extent (phi_RM) of the associated rotor magnet (221; 621) is in the range of 0.4 to 0.8, and wherein, between the second recess (230; 231-236; 631) and the associated first recess (211-216; 611), a sprung web-shaped clamping element (291; 691) is formed, which clamping element (291; 691) is tensioned toward the second recess (231-236; 631) during insertion of the associated rotor magnet (221, 621) in the first recess, and which clamping element (291; 691) as a result applies a force to the associated rotor magnet (221; 621) toward the first recess (211-216; 611) in order to hold the associated rotor magnet (221; 621) in the pocket, wherein the second contour covers the first contour in the area of the second recess at least in sections, characterized in that the second rotor plate at least partially covers the clamping element (291; 691), in order to limit in this manner, in an arrangement of the second rotor plate on the first rotor plate, a movement of the clamping element (291; 691) of the first rotor plate in an axial direction toward the second rotor plate, while however allowing a movement of the clamping element (291; 691) in a direction perpendicular to the axial direction.