Electromagnetic linear drive device, comprising: - a ferromagnetic frame whose walls (10, 11) delimit an internal space comprising at least two magnetic air gaps (300, 310), - a mobile member comprising a plurality of magnetized masses (21, 22, 23), said member being suitable for sliding linearly in said air gaps, in a direction of displacement (X-X'), between two extreme positions, said magnetized masses being arranged on said mobile member so as to be able to pass through said magnetic air gaps, - at least two pairs of windings (30A, 30B, 31A, 31B) of electromagnetic turns positioned inside said internal space, said windings being aligned along the direction of displacement (X-X') of said mobile member, the windings of each so-called pair being positioned on either side of said mobile member, symmetrically relative to said direction of displacement, said windings being each mounted on a ferromagnetic core (300A, 300B, 310A, 310B) positioned in said internal space, at right angles to said direction of displacement, said ferromagnetic cores delimiting said air gaps (300, 310), said windings being juxtaposed side by side so as to exhibit adjacent areas (3A, 3B) arranged between the two so-called air gaps and in which the portions of turns are situated in at least one plane at right angles (P2, P3) to said direction of displacement, characterized in that: - at least one of the magnetized masses is dimensioned so as to have at least one portion constantly positioned facing said portions of turns situated in said adjacent areas (3A, 3B) when said mobile member is displaced between the two extreme positions, - the position of the magnetized masses (21, 22, 23) on the mobile member is such that each magnetic air gap (300, 310) is constantly passed through by at least one of said magnetized masses when said mobile member is displaced between the two extreme positions. - a ferromagnetic frame whose walls (10, 11) delimit an internal space comprising at least two magnetic air gaps (300, 310), - a mobile member comprising a plurality of magnetized masses (21, 22, 23), said member being suitable for sliding linearly in said air gaps, in a direction of displacement (X-X'), between two extreme positions, said magnetized masses being arranged on said mobile member so as to be able to pass through said magnetic air gaps, - at least two pairs of windings (30A, 30B, 31A, 31B) of electromagnetic turns positioned inside said internal space, said windings being aligned along the direction of displacement (X-X') of said mobile member, the windings of each so-called pair being positioned on either side of said mobile member, symmetrically relative to said direction of displacement, said windings being each mounted on a ferromagnetic core (300A, 300B, 310A, 310B) positioned in said internal space, at right angles to said direction of displacement, said ferromagnetic cores delimiting said air gaps (300, 310), said windings being juxtaposed side by side so as to exhibit adjacent areas (3A, 3B) arranged between the two so-called air gaps and in which the portions of turns are situated in at least one plane at right angles (P2, P3) to said direction of displacement, - at least one of the magnetized masses is dimensioned so as to have at least one portion constantly positioned facing said portions of turns situated in said adjacent areas (3A, 3B) when said mobile member is displaced between the two extreme positions, - the position of the magnetized masses (21, 22, 23) on the mobile member is such that each magnetic air gap (300, 310) is constantly passed through by at least one of said magnetized masses when said mobile member is displaced between the two extreme positions.