Abstract: Rotor for electric motors, in which the laminations of two types and arranged alternately, are made in a manner that a first type is provided with a plurality of protrusions formed by respective protruding tabs, a plurality of perforations being punched in the lamination near the edge of a respective tab with the same orientation pattern thereof so as to create an alternate sequence of tabs and respective perforations, wherein a respective cavity is provided in the respective lamination in correspondence of the tabs of said first type, whereas the second type of laminations is provided with a plurality of different tabs adapted to engage the cavities formed by the association of said recesses corresponding to said first tabs with said respective perforations, wherein the tabs of the second type are produced without any removal of material.