Method for producing a rotary electric machine stator
A method of producing a stator for a rotary electrical machine comprising a body in which axial recesses are produced and comprising a plurality of conductors arranged in the recesses, which comprises a step of depositing conductors on a linear support that comprises transverse recesses, comprising a first phase of depositing conductors in the recesses in the support in order to form a first layer of conductors, and a second phase of depositing conductors in the recesses, in order to form a second layer of conductors that is arranged vertically above the first layer; the first deposition phase and the second deposition phase consists of depositing one and the same conductor on the linear support. The invention also proposes an arrangement of a set of conductors on a linear support obtained at the end of the deposition step.
1. A method for producing a stator for a rotary electrical machine comprising an annular body in the internal cylindrical face of which there are produced axial recesses and comprising a plurality of phase windings having conductors arranged in associated recesses in the annular body, wherein said method comprises the steps of:
a step of depositing conductors on a linear support of a principal longitudinal orientation, a top face of which comprises transverse recesses, comprising a first phase of depositing conductors in the recesses so as to form a first layer of conductors, and a second phase of depositing conductors in the recesses so as to form a second layer of conductors that is arranged vertically above the first layer,
transferring the conductors, from the linear support, onto an annular support with transverse principal axis whose external cylindrical face comprises transverse recesses distributed angularly about a transverse principal axis of the annular support, so that the two layers of conductors form two coaxial spirals on the annular support, and
transferring the conductors from the annular support onto the body of the stator,
in which, for each winding, a first deposition phase and a second deposition phase comprises depositing one and the same conductor on the linear support, so that a first portion of the conductor partly forms the first layer of conductors and a second portion of the conductor partly forms the second layer of conductors.
2. The method according to claim 1 , wherein said first deposition phase and the second deposition phase each consist, for each conductor, of successively filling the recesses in the linear support that are associated with the conductor, by introducing a roughly rectilinear transverse length of the conductor into an associated recess, folding and/or curving the conductor in order to form a longitudinal length that is situated transversely opposite a lateral vertical longitudinal face of the linear support, and introducing a consecutive transverse length into a consecutive associated recess, so that the conductor forms longitudinal undulations comprising a succession of transverse lengths that are received in the associated recesses and longitudinal lengths that are arranged alternately on each side of the linear support.
3. The method according to claim 1 , wherein for each conductor, the first deposition phase consists of successively filling the associated recesses from upstream to downstream and the second deposition phase consists of successively filling the associated recesses from downstream to upstream.
4. The method according to claim 3 , wherein said second deposition phase is implemented continuously after the first deposition phase, so that the two portions of the conductor are connected together at a downstream end of the linear support.
5. The method according to claim 4 , wherein during the deposition step, all the conductors associated with the windings are deposited simultaneously on the longitudinal support so that, at the end of the winding step, the first portions of the conductors that form the first layer of conductors are roughly parallel and the second portions of the conductors that form the second layer of conductors are roughly parallel.
6. The method according to claim 3 , wherein during the deposition step, all the conductors associated with the windings are deposited simultaneously on the longitudinal support so that, at the end of the winding step, the first portions of the conductors that form the first layer of conductors are roughly parallel and the second portions of the conductors that form the second layer of conductors are roughly parallel.
7. The method according to claim 1 , wherein during the deposition step, all the conductors associated with the windings are deposited simultaneously on the longitudinal support so that, at the end of the winding step, the first portions of the conductors that form the first layer of conductors are roughly parallel and the second portions of the conductors that form the second layer of conductors are roughly parallel.
8. The method according to claim 1 , wherein said first transfer step consists of successively transferring the transverse lengths that are received in the recesses in the linear support to the recesses in the annular support, by running the annular support onto the linear support,
characterized in that the first transfer step consists of progressively transferring the transverse lengths of the conductors from a downstream end recess of the linear support as far as an upstream end recess in the linear support.
9. The method according to claim 1 , wherein for each conductor, the deposition step consists of simultaneously depositing two electrically conductive wires on the linear support that form the conductor.