Electrical cable for a linear motor and winding produced from it

Abstract

An electrical cable ( 3 ) for a linear motor has an electrically highly conductive metallic conductor ( 6 ), an inner conductive layer ( 7 ) that surrounds the metallic conductor, an insulating layer ( 8 ) arranged above the inner conductive layer, an outer conductive layer ( 9 ) that surrounds the insulation, a sheath ( 10 ) made of insulating material, which has been rendered electrically conductive, arranged above the outer conductive layer, and an electrically conductive intermediate layer arranged between the outer conductive layer and the sheath. To allow simple adaptation to different operating voltages, the intermediate layer ( 11 ) includes of a nonwoven material that has a thickness of about 300-600 μm and an electrical resistance of about 150-500 Ω/m.

1 . Electrical cable for a linear motor, comprising: 
 an electrically highly conductive metallic conductor;    an inner conductive layer that surrounds the metallic conductor;    an insulating layer arranged above the inner conductive layer;    an outer conductive layer that surrounds the insulation;    a sheath made of insulating material, which has been rendered electrically conductive, arranged above the outer conductive layer; and    an electrically conductive intermediate layer arranged between the outer conductive layer and the sheath, wherein said intermediate layer is formed from nonwoven material that has a thickness of about 300-600 μm and an electrical resistance of about 150-500 Ω/m.    
   
   
       2 . Cable in accordance with  claim 1 , wherein the nonwoven material is formed from graphite fibers.  
   
   
       3 . Cable in accordance with  claim 1 , wherein the nonwoven material is formed from graphitized synthetic fibers.  
   
   
       4 . Cable in accordance with  claim 1 , wherein the nonwoven material is formed from a combination of graphite fibers and/or graphitized synthetic fibers and synthetic fibers.  
   
   
       5 . Cable in accordance with  claim 1 , wherein the nonwoven material is wound as a strip around the outer conductive layer.  
   
   
       6 . Cable in accordance with  claim 5 , wherein the strip is wound with overlapping edges.  
   
   
       7 . Cable in accordance with  claim 5 , wherein the strip is wound with abutting edges.  
   
   
       8 . Cable in accordance with  claim 5 , wherein the strip is wound with gaps.  
   
   
       9 . Cable in accordance with  claim 1 , wherein the nonwoven material is wrapped as a strip around the outer conductive layer in the longitudinal direction.  
   
   
       10 . Cable in accordance with  claim 9 , wherein the strip is wrapped with an overlap.  
   
   
       11 . Cable in accordance with  claim 9 , wherein the strip is wrapped with abutting edges.  
   
   
       12 . Cable in accordance with  claim 9 , wherein the strip is wrapped with a gap between the longitudinal edges.  
   
   
       13 . Winding for a linear motor, said winding comprising: 
 three electrical cables arranged in grooves of an elongated inductor, wherein the three electrical cables have an electrically conductive sheath and an electrically conductive intermediate layer arranged between the sheath and an outer conductive layer, and wherein at least one metal strand of an electrically highly conductive material that has electrically highly conductive contact with the conductive sheaths of the cable and serves as a grounding conductor is present over the whole length of the stator, said stator including the inductor and the three cables, which are connected to form a three-phase winding, wherein the value of the electrical resistance of the intermediate layer is greater than the corresponding resistance value of the strand used as the grounding conductor.