Rotating electrical machine with slotless stator

Abstract

A slotless stator assembling two divided cores which jointly define a stator core into a cylindrical shape so as to contain therebetween a cylindrically shaped stator winding, wherein the stator winding has an outer diameter larger than an inner diameter of the stator core in the uncompressed condition of the winding. The stator winding is assembled inside the stator core in a radially inward compressed condition. Since the stator winding functions as a spring pressing the inside of the stator core so as to expand in the normal direction (the radial outward direction), the winding is mechanically secured by the resilient spring force to the inner periphery of the stator core. Hence there is no longer the need for a special fixation mechanism or adhesive when assembling the stator core winding and stator core together.

1 . A rotating electrical machine comprising a slotless stator, the slotless stator including a cylindrical stator core having no slots and a cylindrically shaped stator winding having a larger outer diameter than an inner diameter of said stator core, disposed within said stator core in a resiliently compressed condition, and said stator winding being secured to an inner periphery of said stator core by a resultant resilient force of said stator winding.  
     
     
         2 . A slotless stator comprising a cylindrical stator core having no slots and a cylindrically shaped stator winding having a larger outer diameter than an inner diameter of said stator core, disposed within said stator core in a resiliently compressed condition.  
     
     
         3 . A slotless stator according to  claim 6 , further comprising a resilient material inserted between said stator core and said stator winding.  
     
     
         4 . A slotless stator according to  claim 7 , wherein a silicone sheet is used as said resilient material.  
     
     
         5 . A slotless stator according to  claim 6 , further comprising resin, said resin being impregnated in said stator winding, in a condition with said stator winding secured to an inner periphery of said stator core.  
     
     
         6 . A rotating electrical machine according to  claim 1 , wherein said cylindrical stator core includes a plurality of divided cores which jointly define the cylindrical stator core when assembled together.  
     
     
         7 . A rotating electrical machine according to  claim 1 , further comprising a resilient insulating material inserted between said stator core and said stator winding.  
     
     
         8 . A rotating electrical machine according to  claim 7 , wherein a silicone sheet is used as said resilient, insulating material.  
     
     
         9 . A rotating electrical machine according to  claim 7 , further comprising resin, said resin being impregnated in said stator winding, in a condition with said stator winding secured to an inner periphery of said stator core.  
     
     
         10 . A slotless stator according to  claim 2 , wherein said cylindrical stator core includes a plurality of divided cores which jointly define the cylindrical stator core when assembled together.  
     
     
         11 . A slotless stator according to  claim 3 , further comprising resin, said resin being impregnated in said stator winding, in a condition with said stator winding secured to an inner periphery of said stator core.  
     
     
         12 . A rotating electrical machine comprising a slotless stator, the slotless stator including a plurality of approximately rhombic shape coil segments forming a hollow cylindrical shape winding, a resilient insulating sheet wrapped around the outer periphery of said cylindrical shape stator winding, two divided cores of a cylindrical core mounted each on one end of the cylindrical stator winding such that the stator winding pressed the inside of the assembled core in the normal direction and in a resiliently compressed condition, and varnish impregnated into the stator winding.  
     
     
         13 . A slotless stator according to  claim 12 , wherein an outer diameter of said stator winding in an uncompressed condition is larger than an inner diameter of said cylindrical core.