Stator of an electric machine
A stator of an electric machine having stator slots and conductor elements running through the stator slots in order to form an electric winding is already known, wherein the conductor elements protrude with their conductor ends out from the stator slots and form a winding head at each of the two end faces of the stator, the conductor ends of the conductor elements each having a cabinet portion running in the circumferential direction and a joining portion for contacting another of the conductor elements, each of the joining portions arranged adjacently to one another of two conductor elements being joined, for example welded, by means of a joint and in each case forming a conductor pair, the conductor pairs being arranged in the winding head in a specific radial winding head position in relation to a stator axis. The strength of the joints in the stator according to the invention is dependent on the mechanical connection of each conductor pair to the corresponding winding head. In accordance with the invention, conductor pairs ( 11 ) are provided in the winding head ( 6 ), the joint ( 10 ) of which conductor pairs has a greater strength, in particular a greater weld depth ( 14 ), greater seam width or a greater seam cross section ( 15 ), than the joint ( 10 ) of the other conductor pairs ( 11 ).
1. A stator of an electric machine, the stator comprising stator slots ( 3 ) and comprising conductor elements ( 4 ) which extend through the stator slots ( 3 ) to form an electrical plug-in winding, wherein the conductor elements ( 4 ) project with conductor ends ( 5 ) from the stator slots ( 3 ) and form a winding head ( 6 ) on each of two end faces of the stator ( 1 ), wherein the conductor ends ( 5 ) of the conductor elements ( 4 ) each comprise a skewed portion ( 5 . 1 ) which extends in a peripheral direction and a joining portion ( 5 . 2 ) for contacting another of the conductor elements ( 4 ), wherein respective abutting joining portions ( 5 . 2 ) of two conductor elements ( 4 ) are joined by means of by a joining connection ( 10 ) and respectively form a conductor pair ( 11 ), wherein the conductor pairs ( 11 ) lie in the winding head ( 6 ) in a specific radial winding head position with respect to a stator axis ( 12 ), wherein the winding head position includes a winding head outer position (AL), a winding head inner position (IL) and intermediate winding head intermediate positions (ZL), wherein a conductor pair ( 11 ), which is disposed in the winding head outer position (AL) or in the winding head inner position (IL) and in which none of the skewed portions ( 5 . 1 ) are crossed with one of the skewed portions ( 5 . 1 ) of other conductor pairs ( 11 ) to form an interlacing ( 13 ), forms a free-standing conductor pair (FLP),
wherein a conductor pair ( 11 ), which is disposed in the winding head outer position (AL) or in the winding head inner position (IL) and in which only one of the two skewed portions ( 5 . 1 ) is crossed with one of the skewed portions ( 5 . 1 ) of other conductor pairs ( 11 ) with mutual contact or support to form an interlacing ( 13 ), forms a one side-connected conductor pair (ELP),
wherein the interlacing ( 13 ) is provided with mutual contact or support at a specific interlacing height (VH) relative to an end face of the stator ( 1 ),
wherein a conductor pair ( 11 ), which is disposed in the winding head outer position (AL) or in the winding head inner position (IL) and the skewed portions ( 5 . 1 ) of which are crossed without contact to form an interlacing ( 13 ), form a contactlessly interlaced conductor pair (FLP), and
wherein conductor pairs ( 11 ) are provided in the winding head ( 6 ), the joining connections ( 10 ) of the conductor pairs in the winding head having greater strength than the joining connection ( 10 ) of the other conductor pairs ( 11 ).
2. The stator according to claim 1 , characterized in that the one side-connected conductor pairs (ELP), in which a ratio of the interlacing height (VH) to the height of the winding head (WH) is configured to be less than 0.5, and/or all free-standing conductor pairs (FLP) and/or all contactlessly interlaced conductor pairs (FLP) each comprise a joining connection ( 10 ) having greater strength.
3. The stator according to claim 1 , characterized in that the weld seam cross-section ( 15 ) of the joining connections ( 10 ) having the lesser strength is 30% to 50% smaller than the weld seam cross-section ( 15 ) of the joining connections ( 10 ) having the greater strength.
4. The stator according to claim 1 , characterized in that one of the two winding heads ( 6 ) is symmetrical and the other of the two winding heads ( 6 ) is asymmetrical, wherein the joining connections ( 10 ) having greater strength are provided in the asymmetrical winding head ( 6 ).
5. The stator according to claim 1 , characterized in that the conductor elements ( 4 ) of the electrical plug-in winding are configured as an I-pin or as a hairpin.
6. A stator of an electric machine, the stator comprising stator slots ( 3 ) and comprising conductor elements ( 4 ) which extend through the stator slots ( 3 ) to form an electrical plug-in winding, wherein the conductor elements ( 4 ) project with conductor ends ( 5 ) from the stator slots ( 3 ) and form a winding head ( 6 ) on each of two end faces of the stator ( 1 ), wherein the conductor ends ( 5 ) of the conductor elements ( 4 ) each comprise a skewed portion ( 5 . 1 ) which extends in a peripheral direction and a joining portion ( 5 . 2 ) for contacting another of the conductor elements ( 4 ), wherein respective abutting joining portions ( 5 . 2 ) of two conductor elements ( 4 ) are welded to form a joining connection ( 10 ) and respectively form a conductor pair ( 11 ), wherein the conductor pairs ( 11 ) lie in the winding head ( 6 ) in a specific radial winding head position with respect to a stator axis ( 12 ), wherein the winding head position includes a winding head outer position (AL), a winding head inner position (IL) and intermediate winding head intermediate positions (ZL), wherein a conductor pair ( 11 ), which is disposed in the winding head outer position (AL) or in the winding head inner position (IL) and in which none of the skewed portions ( 5 . 1 ) are crossed with one of the skewed portions ( 5 . 1 ) of other conductor pairs ( 11 ) to form an interlacing ( 13 ), forms a free-standing conductor pair (FLP),
wherein a conductor pair ( 11 ), which is disposed in the winding head outer position (AL) or in the winding head inner position (IL) and in which only one of the two skewed portions ( 5 . 1 ) is crossed with one of the skewed portions ( 5 . 1 ) of other conductor pairs ( 11 ) with mutual contact or support to form an interlacing ( 13 ), forms a one side-connected conductor pair (ELP),
wherein the interlacing ( 13 ) is provided with mutual contact or support at a specific interlacing height (VH) relative to an end face of the stator ( 1 ),
wherein a conductor pair ( 11 ), which is disposed in the winding head outer position (AL) or in the winding head inner position (IL) and the skewed portions ( 5 . 1 ) of which are crossed without contact to form an interlacing ( 13 ), form a contactlessly interlaced conductor pair (FLP), and
wherein conductor pairs ( 11 ) are provided in the winding head ( 6 ), the joining connections ( 10 ) of the conductor pairs in the winding head having a greater weld depth ( 14 ), greater weld seam width or a greater weld seam cross-section ( 15 ), than the joining connection ( 10 ) of the other conductor pairs ( 11 ).
7. The stator according to claim 6 , characterized in that the one side-connected conductor pairs (ELP), in which a ratio of the interlacing height (VH) to the height of the winding head (WH) is configured to be less than 0.5, and/or all free-standing conductor pairs (FLP) and/or all contactlessly interlaced conductor pairs (FLP) each comprise a joining connection ( 10 ) having greater strength.
8. The stator according to claim 6 , characterized in that the weld seam cross-section ( 15 ) of the joining connections ( 10 ) having the lesser strength is 30% to 50% smaller than the weld seam cross-section ( 15 ) of the joining connections ( 10 ) having the greater strength.
9. The stator according to claim 6 , characterized in that one of the two winding heads ( 6 ) is symmetrical and the other of the two winding heads ( 6 ) is asymmetrical, wherein the joining connections ( 10 ) having greater strength are provided in the asymmetrical winding head ( 6 ).
10. The stator according to claim 6 , characterized in that the conductor elements ( 4 ) of the electrical plug-in winding are configured as an I-pin or as a hairpin.
11. The stator according to claim 6 , characterized in that the joining connections ( 10 ) of the conductor pairs in the winding head having a greater weld depth ( 14 ) than the joining connection ( 10 ) of the other conductor pairs ( 11 ).
12. The stator according to claim 6 , characterized in that the joining connections ( 10 ) of the conductor pairs in the winding head having a greater weld seam width than the joining connection ( 10 ) of the other conductor pairs ( 11 ).
13. The stator according to claim 6 , characterized in that the joining connections ( 10 ) of the conductor pairs in the winding head having a greater weld seam cross-section ( 15 ) than the joining connection ( 10 ) of the other conductor pairs ( 11 ).
14. The stator according to claim 13 , characterized in that the weld seam cross-section ( 15 ) of the joining connections ( 10 ) having the lesser strength is 30% to 50% smaller than the weld seam cross-section ( 15 ) of the joining connections ( 10 ) having the greater strength.