Rotary electrical machine provided with a stator

Abstract

A stator of a rotary electrical machine has a stator body formed by a stack of metal sheets. The stator body is delimited by inner and outer radial surfaces. Notches in the stator body extend axially. Each notch has a notch base and a notch opening, and the notch opening is on the side of the inner radial surface. A stator winding is supported by the stator body, and the winding has a plurality of winding parts. Each part is accommodated in one of the notches. Each of the notches at the notch opening has a closure element. Each winding par in a notch is retained between the notch base and the closure element. The closure elements are formed by offsetting at least one of the metal sheets of an adjacent notch in the direction of the notch.

1 . Stator ( 6 ) of a rotary electrical machine ( 1 ), comprising:
 a stator body ( 4 ) formed by a stack of metal sheets, said stator body being provided with an axis (X) and being delimited by an inner radial surface and an outer radial surface;   notches ( 44 ) provided in said stator body and extending axially, each of them having a notch base ( 48 ) and a notch opening ( 49 ), said notch opening being situated on the side of said inner radial surface;   a stator winding ( 5 ) supported by said stator body, said winding comprising a plurality of winding parts ( 51 ,  52 ,  53 ), each of them being accommodated in one of said notches,   
       wherein each of the notches ( 44 ,  41 ,  42 ,  43 ) is provided at the notch opening with at least one notch closure element ( 451 ,  452 ,  453 ,  454 ), such that the winding part which is accommodated in said notch is retained between the notch base and said closure element, and 
       wherein for each of the notches, said closure element is formed by offsetting ( 451 ,  452   a ,  452   b ,  453 ,  454 ) of at least one of the metal sheets of an adjacent notch in the direction of said notch. 
     
     
         2 . Stator according to  claim 1 , wherein one notch out of two comprises a number N of closure elements, N being a whole number equal to 2 or more, and the remaining notches comprising a number of closure elements strictly smaller than N. 
     
     
         3 . Stator according to  claim 2 , wherein two notches with a number N of closure elements are adjacent to both sides of a notch with a smaller number of closure elements. 
     
     
         4 . Stator according to  claim 1 , wherein with the notches being numbered according to the circumference of the stator, the notches with an even number comprise a number of closure elements different from that of the notches with an odd number. 
     
     
         5 . Stator according to  claim 1 , wherein the closure elements of the notches ( 42 ) are distributed axially along the axial length of the stator body. 
     
     
         6 . Stator according to  claim 5 , wherein at least one of the closure elements of a notch ( 41 ,  43 ) with a smaller number of closure elements is situated on a radial plane which passes via the middle of two adjacent closure elements of a notch ( 42 ) comprising the N closure elements. 
     
     
         7 . Stator according to  claim 1 , wherein, for a given notch ( 42 ), with the closure elements of this notch being situated respectively on first radial planes of the stator body, and the closure elements of the adjacent notch ( 41 ,  43 ) being situated respectively on second radial planes of the stator body, the first radial planes are different from the second radial planes. 
     
     
         8 . Stator according to  claim 7 , wherein the first radial planes and the second radial planes are spaced axially by a distance equal to at least two metal sheets. 
     
     
         9 . Stator according to  claim 1 , wherein a closure element ( 452 ) is formed firstly by the offsetting ( 452   a ) of at least one of the metal sheets of an adjacent notch to the right in the direction of said notch, and secondly by offsetting ( 452   b ) of at least one of the metal sheets of an adjacent notch to the left in the direction of said notch, the two offsettings being situated on the same radial plane. 
     
     
         10 . Stator according to  claim 1 , wherein a closure element ( 451 ,  452 ,  453 ,  454 ) is formed by offsetting of at least two contiguous metal sheets, such that the closure element has an axial height of at least two metal sheets. 
     
     
         11 . Stator according to  claim 1 , wherein, for each closure element of a notch ( 42 ), at least one of the two adjacent notches has traces of deformation by radial introduction of a tool ( 60 ) with an orthoradial dimension greater than the notch width. 
     
     
         12 . Stator according to  claim 1 , wherein, for each closure element of a notch ( 42 ), at least one of the two adjacent notches has traces of deformation by radial introduction of a tool ( 60 ) with a substantially spherical form. 
     
     
         13 . Stator according to  claim 11 , wherein the winding part ( 51 ,  52 ,  53 ) of a notch has traces of compacting by said radial introduction of the tool ( 60 ). 
     
     
         14 . Stator according to  claim 1 , wherein the winding part ( 51 ,  52 ,  53 ) of a notch comprises a plurality of wires aligned according to a column. 
     
     
         15 . Rotary electrical machine provided with a stator according to  claim 1 . 
     
     
         16 . Stator according to  claim 2 , wherein with the notches being numbered according to the circumference of the stator, the notches with an even number comprise a number of closure elements different from that of the notches with an odd number. 
     
     
         17 . Stator according to  claim 3 , wherein with the notches being numbered according to the circumference of the stator, the notches with an even number comprise a number of closure elements different from that of the notches with an odd number. 
     
     
         18 . Stator according to  claim 2 , wherein the closure elements of the notches ( 42 ) are distributed axially along the axial length of the stator body. 
     
     
         19 . Stator according to  claim 3 , wherein the closure elements of the notches ( 42 ) are distributed axially along the axial length of the stator body. 
     
     
         20 . Stator according to  claim 4 , wherein the closure elements of the notches ( 42 ) are distributed axially along the axial length of the stator body.