Squirrel-cage rotor

Abstract

The invention relates to a squirrel-cage rotor for an asynchronous machine, said squirrel-cage rotor having at least one laminated rotor core that comprises a plurality of grooves and said squirrel-cage rotor having at least one rotor cage comprising electrically conductive rotor bars that are embedded in the grooves of the laminated rotor core in such a manner that the rotor bars comprise at their two end regions an overlap beyond the laminated rotor core, and said rotor cage comprising short-circuit rings that are attached at the end face to the laminated rotor core and comprise a plurality of slots that are arranged in the region of their outer periphery and the end regions of the rotor bars protrude into said slots. The short-circuit rings comprise in each case at least two metal composite discs that comprise at least a first metal disc and a second metal disc that is connected in a planar manner to said first metal disc and is embodied from a different material thereto. Adjacent metal composite discs are arranged at least in part in such a manner that the first metal discs are facing one another. The rotor bars are bonded to the first metal discs in the region of the slots.

1 . Squirrel-cage rotor for an asynchronous machine, said squirrel-cage rotor having at least one laminated rotor core that comprises a plurality of grooves and said squirrel-cage rotor having at least one rotor cage comprising electrically conductive rotor bars that are embedded in the grooves of the laminated rotor core in such a manner that the rotor bars comprise at their two end regions an overlap beyond the laminated rotor core, and said rotor cage comprising short-circuit rings that are attached at the end face to the laminated rotor core and comprise a plurality of slots that are arranged in the region of their outer periphery and the end regions of the rotor bars protrude into said slots,
 characterized in   that the short-circuit rings comprise in each case at least two metal composite discs that comprise at least a first metal disc and a second metal disc that is connected in a planar manner to said first metal disc and is embodied from a different material thereto,   that adjacent metal composite discs are arranged at least in part in such a manner that the first metal discs are facing one another and   that the rotor bars are bonded to the first metal discs in the region of the slots.   
     
     
         2 . Squirrel-cage rotor according to  claim 1 , characterized in that the rotor bars are embodied at least in part from a material that can be easily welded to the material of the first metal disc. 
     
     
         3 . Squirrel-cage rotor according to  claim 2 , characterized in that the rotor bars are embodied at least in part from a material whose base material is identical to the base material of the first metal discs. 
     
     
         4 . Squirrel-cage rotor according to  claim 1 , characterized in that the first and second metal discs are connected one to the other in a planar manner by means of a plating process. 
     
     
         5 . Squirrel-cage rotor according to  claim 1 , characterized in that the first metal discs comprise on their outer periphery at least one bevel. 
     
     
         6 . Squirrel-cage rotor according to  claim 1 , characterized in that the first metal discs are embodied from aluminum or an aluminum alloy. 
     
     
         7 . Squirrel-cage rotor according to  claim 6 , characterized in that the thickness s 1  of the first metal discs is at least 60% of the thickness s of the metal composite discs. 
     
     
         8 . Squirrel-cage rotor according to  claim 1 , characterized in that the first metal discs are embodied from copper or a copper alloy.