Vehicle alternator stator winding having dual slot configuration
View Patent ↗A stator for an electric machine includes a stator core having a plurality of circumferentially-spaced and axially-extending core slots. The core slots extend between a first and a second end of the stator core and a stator winding having a plurality of phases is positioned therein. Each of the phases includes a first pair of conductors connected in parallel and a second pair of conductors connected in parallel, in turn connected to one another in series to define a single phase of the stator winding. The first pair of conductors and the second pair of conductors occupy adjacent slots such that each single phase of the stator winding occupies two adjacent slots within the stator core. Each conductor has a plurality of slot segments housed in the core slots that are alternately connected at the ends of the stator core by a plurality of end loop segments.
1. A stator for an electric machine, comprising:
a generally cylindrically-shaped stator core having a plurality of circumferentially-spaced and axially-extending core teeth that define a plurality of circumferentially-spaced and axially-extending core slots in a surface thereof, the core slots extending between a first and a second end of the stator core; and
a stator winding having a plurality of phases, each of the phases including a first set of conductors connected in parallel and a second set of conductors connected in parallel, the first set of conductors being connected in series to the second set conductors to define a single phase of the stator winding;
the first set of conductors and the second set of conductors occupying adjacent slots within the stator core such that each single phase of the stator winding occupies two adjacent slots within the stator core;
each individual conductor having a plurality of slot segments housed in the core slots, the slot segments alternately connected at the first and second ends of the stator core by a plurality of end loop segments.
2. The stator of claim 1 wherein the slot segments of the two conductors of each of the first and second sets of conductors alternate radial positions within respective slots within the stator core.
3. The stator according to claim 1 wherein the stator winding includes three phases, the three phases being connected to one another in a delta configuration.
4. The stator according to claim 3 wherein the three phase delta configuration is connected to a rectifier.
5. The stator according to claim 1 wherein the stator winding includes three phases connected to one another in a wye configuration having a single neutral point.
6. The stator according to claim 5 wherein the three phase wye configuration is connected to a rectifier.
7. The stator according to claim 1 wherein the stator winding includes three phases connected to one another in a wye configuration having two neutral points.
8. The stator according to claim 7 wherein the three phase wye configuration is connected to a rectifier.
9. The stator of claim 1 wherein at least half of the end loop segments connect a first slot segment housed in a radial position of a first core slot with a second slot segment housed in the same radial position of a second core slot.
10. The stator of claim 9 wherein at least half of the end loop segments each include at least one substantially sloped portion.
11. The stator of claim 10 wherein at least half of the end loop segments each include at least two radial adjustments.
12. The stator of claim 11 wherein at least half of the end loop segments have a pitch greater than three.
13. The stator of claim 12 wherein the conductors of the stator winding are cascaded.
14. The stator according to claim 1 wherein the slot segments housed in the core slots are aligned in a radial row and have a rectangular cross section.
15. The stator according to claim 1 wherein a width of the slot segments, including any insulation, fits closely to the width of the core slots, including any insulation.
16. The stator according to claim 1 wherein at least one of the conductors of a particular one of the phases is formed of a continuous conductor.
17. The stator according to claim 1 wherein the first set of conductors and the second set of conductors are shifted from one another by one slot such that the first set of conductors and the second set of conductors are out of phase with one another and define two phases of the stator core, the phases of the stator being connected in a delta configuration and connected to a rectifier.
18. The stator according to claim 1 wherein the first set of conductors and the second set of conductors are shifted from one another by one slot such that the first set of conductors and the second set of conductors are out of phase with one another and define two phases of the stator core, the phases of the stator being connected in a wye configuration and connected to a rectifier.