Electric Machine Rotor and Related Electric Machine

A rotor of an electric machine comprising a drive shaft, a plurality of foils provided with an insertion seat at which they are coaxially keyed to the drive shaft at a keying portion. The foils have the shape of a circular sector extending from an outer edge, corresponding to an outer diameter of the rotor, and an inner edge, corresponding to a minimum or inner diameter delimiting the insertion seat which interfaces with the keying portion of the drive shaft. The keying portion includes a lateral surface which interfaces with the insertion seat of the foils. The foils include cavities passing through an axial thickness of the foil, which impart elasticity in a radial direction, perpendicular to the rotation axis, to blocking portions of the foils. The blocking portions include a central block, having a central radial thickness, and two lateral blocks, having an intermediate radial thickness and an end radial thickness which are lower than the central radial thickness of the central block.