is essential to the invention that the laminations 11 and 12 and the ends 14 and 15 alternate with one another as viewed in the circumferential direction of the commutator 10 so that one group of ends 14 terminate in a first plane 18 perpendicular to the longitudinal axis 13 of the commutator 10 while the other ends 15 of the laminations 12 terminate in a second plane 19 which is likewise disposed perpendicular to the longitudinal axis 13 of the commutator 10 since the two planes 18 and 19 are disposed parallel to one another one plane 18 is spaced apart farther on the winding side of the armature from the windings of the armature than the other plane 19 in fig2 a partly sectional view of the arrangement of laminations 11 and 12 is shown in which it can be seen that these laminations on their inside oriented toward the longitudinal axis 13 each have riblike portions 21 22 which on sides facing away from one another form pockets 23 and 24 the pockets 23 and 24 serve to receive reinforcing rings 25 in particular which serve to stiffen and radially secure the laminations 11 and 12 for the sake of simpler introduction or insertion of the reinforcing rings 25 in the assembly direction indicated by the arrow 26 it is advantageous if the inside circumference of the pockets 23 24 is larger than the outside diameter of the reinforcing rings 25 a structural unit completed to this point comprising.