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Electric cable for use as phase winding for linear motors

  • US 4,785,138 A
  • Filed: 10/31/1986
  • Issued: 11/15/1988
  • Est. Priority Date: 12/06/1985
  • Status: Expired due to Term
First Claim
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1. In an electric cable for use as a phase winding in a three-phase alternating-current winding for linear motors in which the phase windings are fixed in a meander-like course in the grooves of an elongated inductor, the cable comprising a metallic conductor, an inner conductive layer surrounding the conductor, a layer of insulation disposed over said conductive layer, an outer conductive layer surrounding said insulation and a sheathing of electrically conductive material disposed over said outer conductive layer, the improvement whereinsaid conductor is a stranded conductor having at least two layers of individual wires, and the direction of lay of the individual wires of the stranded conductor differs between successive ones of said layer of wires;

  • said conductor is compacted in its entirety to about 90% of its original size during and annealed after a stranding operation to provide for substantially inelastic bending of the conductor;

    said inner conductive layer is formed on said stranded conductor by extrusion, fills up outer interstices between individual wires of an outer layer of the stranded conductor, and is firmly attached to said insulation surrounding the inner conductive layer;

    said outer conductive layer comprises a highly conductive flexible material which is firmly attached to said insulation; and

    the sheathing is of high electric conductivity and comprises a material of sufficient elasticity and sufficient mechanical strength to allow emplacement of the cable in grooves to be filled in said inductor, with substantially inelastic bending of the cable causing the cable to substantially retain the physical configuration of the grooves.

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