Linear-induction electromagnetic machine with optimized magnetic flux distribution and use

A linear-induction electromagnetic machine including a substantially straight tubular duct intended to receive a conducting material which can circulate axially in the duct between an entry part and an exit part of the duct and an inductor comprising a magnetic circuit formed by magnetic sheet metal combs arranged around at least a part of a periphery of the duct and forming mutually parallel notches arranged along the combs in the axial direction of the duct and separated from each other along the axial direction by teeth of the combs of the inductor projecting radially towards an inside part of the duct, at least one winding being arranged in each of the notches and connected to one phase of a polyphase current source having successive phases, said inductor comprising two end parts respectively facing the entry and the exit parts of the duct and a central part between the end parts, wherein the teeth which are arranged in at least one of the end parts of the inductor have a length in the axial direction greater than a length in the axial direction of the teeth arranged in the central part of the inductor and wherein the notches of said combs in the central part of the inductor have a depth in the radial direction greater than the depth of the notches in the end parts of the inductor and enclose windings with a greater number of turns.