Reciprocating device for winding a yarn in the form of a package

A device for winding, at high speed, a yarn onto a rotating support and comprising a yarn delivery system including a depositing yarn guide, displaced so as to undergo a to-and-fro movement parallel to a surface of said support with rapid deceleration and acceleration at a point of reversal of the to-and-fro movement, the depositing yarn guide being displaced by means of a moving element or cursor associated with a magnetized plate of a linear motor, supplied with two-phase or three-phase current, wherein a stator of the linear motor is formed by at least one assembly of elementary modules placed either face to face or placed so that each lies in an extension of another, each having a plurality of C-shaped magnetic circuits that define, between ends of their separated legs, an airgap inside which the magnetized plate is positioned, comprising an alternation of North and South poles (N and S), which constitutes the moving element that displaces the cursor carrying the yarn guide and in which:

• the magnetic circuits of each elementary module are formed by a plurality of pairs of posts (P1, P2) placed opposite each other in each pair, each series of posts (P1 and P2) being associated with a coil in order to form a magnetic field in the airgap that they define, the spacing between two consecutive posts corresponding to twice the distance between two consecutive North/South poles (N/S) provided on the magnetized plate;
• posts of a module that are connected to one and the same phase of the electrical supply are offset relative to posts that are connected to the other phase or other phases by a value corresponding to the magnetic step divided by the number of phases;
• the magnetized plate has dimensions enabling it to be inserted into the airgap of at least one elementary module of each of the supply phases, especially a length in order to cover two aligned modules (with a two-phase supply) or three aligned modules (with a three-phase supply), or especially a width in order to cover two modules (with a two-phase supply) that are placed facing each other, said plate comprising, on these two phases, an alternation of North/South poles (N/S) spaced apart by a distance corresponding to at least the half-distance lying between two consecutive posts;
• and
• means are provided for keeping the magnetized plate strictly in a mid-plane of the airgap of the magnetic circuit.