Wire assembly for rotary electric machine and corresponding method to obtain the wire assembly
The invention relates to a wire assembly for electric rotary machine comprising a plurality of phase coils (P 1 -P 6 ), each phase coils (P 1 -P 6 ) being aimed to be inserted in a dedicated set of slots ( 18 ) of a stator ( 10 ), each phase coil (P 1 -P 6 ) comprising a first part ( 61 ) having an input (I 1 -I 6 ) and a second part ( 62 ) having an output (O 1 -O 6 ), the first part ( 61 ) and second part ( 62 ) constituting a distributed wave winding, wherein each phase coil (P 1 -P 6 ) comprises a U-turn part ( 63 ) linking the first ( 61 ) and the second ( 62 ) parts so that each phase coil (P 1 -P 6 ) is composed of a single wire ( 23 ).
1. A wire assembly ( 44 ) for an electric rotary machine comprising a plurality of phase coils (P 1 -P 6 ),
wherein each of the phase coils (P 1 -P 6 ) is configured to be inserted in a dedicated set of slots ( 18 ) of a stator ( 10 ),
wherein each of the phase coils (P 1 -P 6 ) comprises:
a first part ( 61 ) having an input (I 1 -I 6 );
a second part ( 62 ) having an output (O 1 -O 6 ), the first part ( 61 ) and the second part ( 62 ) constituting a distributed wave winding; and
a U-turn part ( 63 ) linking the first part ( 61 ) and the second part ( 62 ) so that each of the phase coils (P 1 -P 6 ) forms a single wire ( 23 ),
wherein, in the U-turn part ( 63 ), the single wire ( 23 ) comprises a slope portion ( 64 ) inclined in a thickness direction of the wire assembly ( 44 ), and wherein the slope portion ( 64 ) overlaps the single wire ( 23 ) positioned inside one of the slots ( 18 ) when viewed in the thickness direction of the wire assembly ( 44 ).
2. The wire assembly according to claim 1 , wherein the wire ( 23 ) of each of the phase coils (P 1 -P 6 ) comprises:
a plurality of straight portions ( 25 ) configured to be inserted into the slots ( 18 ) of the stator ( 10 ), and
a plurality of end-loop portions ( 26 ) linking the straight portions ( 25 ),
the end-loop portions ( 26 ) linking a plurality of consecutive straight portions ( 25 ) being positioned in a same layer (L 1 , L 2 ) of conductors.
3. The wire assembly according to claim 2 , wherein, in the first ( 61 ) and second ( 62 ) parts of each of the phase coils (P 1 -P 6 ), a given straight portion ( 25 ) is linked to two adjacent straight portions ( 25 ) disposed on two opposite sides of the given straight portion ( 25 ).
4. The wire assembly according to claim 2 , wherein, in the U-turn part ( 63 ), one of the straight portions portion ( 25 ) is linked to two of the straight portions ( 25 ) positioned on the same side through the end-loop portions ( 26 ).
5. The wire assembly according to claim 2 , wherein, in the U-turn part ( 63 ), the straight portion ( 25 ) comprises the slope portion ( 64 ).
6. The wire assembly according to claim 1 , wherein, in the first ( 61 ) and second ( 62 ) parts of each of the phase coils (P 1 -P 6 ), a given straight portion ( 25 ) is linked to two adjacent straight portions ( 25 ) disposed on two opposite sides of the given straight portion ( 25 ).
7. The wire assembly according to claim 6 , wherein, in the U-turn part ( 63 ), a straight portion ( 25 ) is linked to two straight portions ( 25 ) positioned on the same side through end-loop portions ( 26 ).
8. The wire assembly according to claim 6 , wherein, in the U-turn part ( 63 ), the straight portion ( 25 ) comprises the slope portion ( 64 ).
9. The wire assembly according to claim 1 , wherein, in the U-turn part ( 63 ), a straight portion ( 25 ) is linked to two straight portions ( 25 ) positioned on the same side through end-loop portions ( 26 ).
10. The wire assembly according to claim 4 , wherein, in the U-turn part ( 63 ), the straight portion ( 25 ) comprises the slope portion ( 64 ).
11. The wire assembly according to claim 1 , wherein the wire ( 23 ) of each of the phase coils (P 1 -P 6 ) comprises a plurality of straight portions ( 25 ) configured to be inserted into the slots ( 18 ) of the stator ( 10 ), and wherein, in the U-turn part ( 63 ), the straight portion ( 25 ) comprises the slope portion ( 64 ).
12. The wire assembly according to claim 1 , wherein a length of the wire assembly ( 44 ) is equal to N times the circumference of the stator ( 10 ), and wherein N is at least equal to two.
13. The wire assembly according to claim 1 , wherein there is a transversal offset between the first ( 61 ) and the second ( 62 ) parts of each of the phase coils (P 1 -P 6 ).