Terminals and connections between multi-set segmented hairpin windings
View Patent ↗An electric machine is disclosed herein comprising a core with a plurality of slots, the core including an insertion side and an opposing side. A winding arrangement is provided in the plurality of slots of the core. The winding arrangement is comprised of a plurality of differently shaped hairpin conductors. Each of the plurality of differently shaped hairpin conductors includes at least one leg inserted into one of the plurality of slots, with a leg end of the at least one leg extending from the opposing side of the core. All the leg ends extending from the opposing side of the core are bent the same number of slots and connected to immediately adjacent leg ends at the opposing side of the core. Thus, all connections between the differently shaped hairpin conductors are provided at the opposing side of the core.
1. An electric machine comprising:
a core comprising a plurality of slots, the core including an insertion side and an opposing side;
a winding arrangement provided in the plurality of slots of the core, the winding arrangement comprised of a plurality of differently shaped hairpin conductors, each of the plurality of differently shaped hairpin conductors including at least one leg inserted into one of the plurality of slots with a leg end of the at least one leg extending from the opposing side of the core;
wherein the plurality of differently shaped hairpin conductors form at least two winding sets, including a first winding set and a second winding set, the first winding set provided in a first conductor layer and a second conductor layer in the plurality of slots and the second winding set provided in a third conductor layer and a fourth conductor layer in the plurality of slots; and
wherein all the leg ends extending from the opposing side of the core for the winding arrangement are bent the same number of slots and connected to immediately adjacent leg ends at the opposing side of the core; and
wherein the connections between the differently shaped hairpin conductors are all provided at the opposing side of the core.
2. The electric machine of claim 1 wherein all of the plurality of differently shaped hairpin conductors, with the exception of hairpin conductors that provide terminal connections, include U-turn portions provided at the insertion side of the core and no connections between any hairpin conductors are made at the insertion side of the core.
3. The electric machine of claim 2 wherein all of the plurality of differently shaped hairpin conductors, with the exception of hairpin conductors that provide terminal connections, include at least two legs and a U-turn portion provided between at least two legs.
4. The electric machine of claim 1 wherein the first winding set and the second winding set are both multi-phase winding sets.
5. The electric machine of claim 1 wherein the plurality of differently shaped hairpin conductors that form the first set are mostly comprised of a first standard hairpin conductor having a U-turn portion spanning a predetermined number of slots in the first set, and wherein the plurality of differently shaped hairpin conductors that form the second set are mostly comprised of a second standard hairpin conductor having a U-turn portion spanning the predetermined number of slots in the second set.
6. The electric machine of claim 5 wherein the plurality of differently shaped hairpin conductors further comprise a plurality of hairpin conductors configured to connect phase windings of the same phase in series.
7. The electric machine of claim 5 wherein the plurality of differently shaped hairpin conductors further comprise a plurality of hairpin conductors configured to connect the first winding set and the second winding set.
8. The electric machine of claim 7 wherein each of the plurality of hairpin conductors configured to connect the first winding set and the second winding set each include a U-turn portion at the insertion side of the core that extends between a leg in the second conductor layer and a leg in the third conductor layer.
9. The electric machine of claim 6 wherein the plurality of differently shaped hairpin conductors further comprise a hairpin conductor configured to connect neutral connections between phase windings.
10. The electric machine of claim 6 wherein the plurality of differently shaped hairpin conductors further comprise terminal connections for the phase windings.
11. A winding arrangement provided on an electric machine core including a plurality of slots, an insertion side and an opposite side, the winding arrangement comprising:
a plurality of conductor segments positioned in the slots, each of the plurality of conductor segments bent into one of several shapes, the plurality of conductor segments connected together to form at least two winding sets, including a first winding set and a second winding set, wherein the first winding set and the second winding set are both multi-phase windings, each of the plurality of conductor segments comprising at least one leg end extending from the opposite side of the core and bent a predetermined number of slots, each leg end connected to an immediately adjacent leg end on the opposite side of the core;
wherein the plurality of conductor segments include at least one first conductor segment including two legs and a U-turn portion, the first conductor segment configured to connect same phase windings of the multi-phase windings in series; and
wherein the plurality of conductor segments include at least one second conductor segment including two legs and a U-turn portion, the second conductor segment configured to connect the first winding set and the second winding set.
12. The winding arrangement of claim 11 wherein none of the plurality of conductor segments are connected to another conductor segment at the insertion side of the core.
13. The winding arrangement of claim 11 wherein the legs extending from the opposite side of the core are arranged in radial rows, and each leg end in a radial row is connected to an adjacent leg end in the same radial row.
14. The winding arrangement of claim 11 wherein the first winding set is provided in a first conductor layer and a second conductor layer in the slots, the first winding layer adjacent to the second winding layer, and wherein the second winding set is provided in a third conductor layer and a fourth conductor layer in the slots, the third winding layer adjacent to the fourth winding layer.
15. The winding arrangement of claim 14 wherein the U-turn portion of the at least one second conductor segment extends between the second conductor layer and the third conductor layer on the insertion side of the core.
16. The winding arrangement of claim 11 wherein the plurality of conductor segments further include a third conductor segment configured to provide a neutral connection between the multi-phase windings, the third conductor comprising a first leg, a second leg and a third leg, and a first turn provided between the first leg and the second leg and a second turn provided between the second leg and the third leg, wherein the first turn and second turn of the third conductor segment extend from the insertion end and the first leg, the second leg and the third leg of the third conductor segment extending from the opposite end of the core.
17. The winding arrangement of claim 11 wherein the plurality of conductor segments further include a first terminal conductor segment, a second terminal conductor segment, and a third terminal conductor segment, each of the first, second and third terminal conductor segments comprising a leg with a first end extending from the insertion end of the core and a second end extending from the opposite end of the core, wherein the first terminal conductor segment is connected to a first winding phase, the second terminal conductor segment is connected to a second winding phase, and the third terminal conductor segment is connected to a third winding phase.
18. An electric machine comprising:
a core comprising a plurality of slots, the core including an insertion side and an opposing side;
a winding arrangement provided in the plurality of slots of the core, the winding arrangement comprising a plurality of differently shaped U-turn conductor segments configured to provide at least two three-phase winding sets, each of the plurality of differently shaped U-turn conductor segments including at least one U-turn portion extending between at least two slots on the insertion side of the core and at least two leg ends, each leg end extending from one of the at least two slots on the opposing side of the core; and
wherein all the leg ends extending from the opposing side of the core are bent the same number of slots and are connected to immediately adjacent leg ends on the opposing side of the core.
19. The electric machine of claim 18 wherein the winding arrangement consists of the plurality of differently shaped U-turn conductor segments and three single leg conductors, each of the single leg conductor positioned in one of the slots of the core and including a terminal end extending from the insertion side of the core and a leg end from the opposing side of the core, wherein the leg end of each single leg conductor is bent the same number of slots as the leg ends of the plurality of differently shaped U-turn conductor segments, and wherein the terminal end of each single leg conductor provides a terminal for one of the three winding phases.
20. The electric machine of claim 19 wherein one of the plurality of differently shaped U-turn conductor segments is a W-shaped conductor segment, the W-shaped conductor segment including a first U-turn portion connecting a first leg end and a second leg end and a second U-turn portion connecting the second leg end and a third leg end, wherein the W-shaped conductor segment provides a neutral connection between the three-phase winding sets.