Dynamoelectric machine stator core with mini caps
A stator assembly for a dynamoelectric machine in accordance with the present invention includes a generally cylindrically-shaped stator core having a plurality of core slots formed along the inner surface thereof and defined by a radial depth and wherein a stator coil is disposed. The plurality of core slots defines a plurality of teeth therebetween, which have caps along the inner surface of the stator core and are connected to the stator core by a yoke portion. The plurality of core slots is lined along respective inner surfaces by a plurality of insulation slot liners. The teeth caps include projections along an inner diameter of the plurality of core slots. The slot openings are delimited by the projections along the stator inner diameter. These projections are substantially equal to a width of the slot liners, and are such that the delimited slot openings are substantially equal to a width of a conductor wire to be inserted into the lined core slots. A stator winding includes slot wire segments that are received by the slot liners, which may be formed in at least one row of slot wire segments.
1. A stator assembly for a dynamoelectric machine, comprising:
a generally cylindrically-shaped stator core having a plurality of circumferentially spaced radially-extending core teeth, adjacent core teeth defining core slots in a surface thereof and each having a respective radial depth and axial length, the core slots extending between a first and a second axial ends of the stator core; and
a stator winding having slot wire segments received by the core slots and the slot wire segments of the stator winding and the core slots being electrically insulated from one another by insulation members,
wherein the plurality of core teeth having projections that define slot openings between adjacent core teeth,
wherein the core slot openings have a width that allow for a radial insertion of the slot wire segments, and the width of the slot openings is less than a width of a main portion of the core slots, and
wherein the slot wire segments are aligned in a radial row in a plurality of core slots and whose widths, including corresponding slot wire segment insulation, closely fit to the width of the main portion of the core slots;
a surface area at the inner diameter of the core teeth including the projections is approximately equal to or less than 20% a surface area at the inner diameter of the core teeth excluding the projections.
2. The stator assembly according to claim 1 wherein a width of the projections is substantially equal to a width of the insulation member.
3. The stator assembly according to claim 1 wherein the slot wire segments have a substantially rectangular cross section.
4. The stator assembly according to claim 1 wherein the insulation member is made from one of a paper and a paper composite having electrically insulating properties.
5. The stator assembly according to claim 1 , wherein the insulation member is a coating which is applied to the inner surface of the core slots.
6. The stator assembly according to claim 1 , wherein the stator winding is varnished to fixedly or adhesively be bonded to the core slots.
7. The stator assembly according to claim 1 , wherein the core slots are rectangular shaped in cross section from a back end of the core slots to a radial outer edge of the projections.
8. The stator assembly according to claim 1 wherein a width of one of the projections is less than the width of the insulation member.
9. The stator assembly according to claim 1 wherein a ratio of the width of the slot openings to the width of the slot wire segments, including corresponding slot wire segment insulation, is approximately equal to or less than 1.33.
10. The stator assembly according to claim 1 wherein the slot wire segments are substantially radially inserted through the slot openings of the core slots.
11. The stator assembly according to claim 1 wherein a stator winding pattern consists of n phase conductors and at least one of the n phases is formed from a continuous conductor having corresponding slot wire segments located in the core slots and end loop segments that connect two adjacent slot wire segments belonging to the at least one of the n phases.
12. The stator according to claim 11 , wherein a substantially large subset of the end loop segments define at least one radial shift adjustment per end loop segment to form a cascade winding.
13. The stator assembly according to claim 1 , wherein the width of the insulation member is approximately equal to or less than 0.18 mm.
14. A stator assembly for a dynamoelectric machine, comprising:
a generally cylindrically-shaped stator core having a plurality of circumferentially spaced radially-extending core teeth, adjacent core teeth defining core slots in a surface thereof and each having a respective radial depth, an axial length and a core slot opening, the core slots extending between a first and a second axial ends of the stator core; and
a stator winding having slot wire segments received by the core slots and the slot wire segments of the stator winding and the core slots being electrically insulated from one another by insulation members,
wherein the core slot openings have a width that allow for a radial insertion of the slot wire segments, and the ratio of the width of the slot openings to the width of the slot wire segments, including corresponding slot wire segment insulation, is approximately equal to or less than 1.33,
wherein the slot wire segments are aligned in a radial row in a plurality of core slots, and whose widths, including corresponding slot wire segment insulation, closely fit to the width of a main portion of the core slots less the insulation members of the corresponding core slots.
15. The stator assembly according to claim 14 wherein the stator winding consists of n phase conductors and the phase conductors having corresponding slot wire segments located in the core slots and end loop segments that connect two adjacent slot wire segments belonging to the at least one of the n phases and a substantially large subset of the end loop segments define at least one radial shift adjustment per end loop segment to form a cascade winding.
16. The stator assembly according to claim 14 , wherein the width of the insulation member is approximately equal to or less than 0.18 mm.
17. The stator assembly according to claim 14 , wherein the slot wire segments are substantially radially inserted through the slot openings of the core slots.
18. A stator assembly for a dynamoelectric machine, comprising:
a generally cylindrically-shaped stator core having a plurality of circumferentially spaced radially-extending core teeth, adjacent core teeth defining core slots in a surface thereof and each having a respective radial depth, an axial length and a core slot opening, the core slots extending between a first and a second axial ends of the stator core; and
a stator winding having slot wire segments received by the core slots and the slot wire segments of the stator winding and the core slots being electrically insulated from one another by insulation members,
wherein the core slot openings have a width that allow for a radial insertion of the slot wire segments, and the ratio of the width of the slot openings to the width of the slot wire segments, including any slot wire segment insulation, is less than 1.33, the slot wire segments are aligned in a radial row in a plurality of core slots, and have a substantially rectangular cross section,
wherein the stator winding consists of n phase conductors and the phase conductors are formed having corresponding slot wire segments located in the core slots and end loop segments that connect two adjacent slot wire segments belonging to the at least one of the n phases, a substantially large subset of the end loop segments define at least one radial shift adjustment per end loop segment to form a cascade winding, and
wherein the width of the insulation member is approximately equal to or less than 0.18 mm.
19. The stator assembly according to claim 18 wherein the slot wire segments are substantially radially inserted through the slot openings of the core slots.
20. A stator assembly for a dynamoelectric machine, comprising:
a generally cylindrically-shaped stator core having a plurality of circumferentially spaced radially-extending core teeth, adjacent core teeth defining core slots in a surface thereof and each having a respective radial depth and axial length, the core slots extending between a first and a second axial ends of the stator core; and
a stator winding having slot wire segments received by the core slots and the slot wire segments of the stator winding and the core slots being electrically insulated from one another by insulation members, the stator winding including n phase conductors wherein at least one of the n phases is formed from a continuous conductor having corresponding slot wire segments located in the core slots and end loop segments that connect two adjacent slot wire segments belonging to the at least one of the n phases;
wherein the plurality of core teeth having projections that define slot openings between adjacent core teeth,
wherein the core slot openings have a width that allow for a radial insertion of the slot wire segments, and the width of the slot openings is less than a width of a main portion of the core slots, and
wherein the slot wire segments are aligned in a radial row in a plurality of core slots and whose widths, including corresponding slot wire segment insulation, the core slots without deforming or shifting.
21. The stator assembly according to claim 20 wherein a width of the projections is substantially equal to a width of the insulation member.
22. The stator assembly according to claim 20 wherein the slot wire segments have a substantially rectangular cross section.
23. The stator assembly according to claim 20 wherein the insulation member is made from one of a paper and a paper composite having electrically insulating properties.
24. The stator assembly according to claim 20 , wherein the insulation member is a coating which is applied to the inner surface of the core slots.
25. The stator assembly according to claim 20 , wherein the stator winding is varnished to fixedly or adhesively be bonded to the core slots.
26. The stator assembly according to claim 20 , wherein the core slots are rectangular shaped in cross section from a back end of the core slots to a radial outer edge of the projections.
27. The stator assembly according to claim 20 wherein a width of one of the projections is less than the width of the insulation member.
28. The stator assembly according to claim 20 wherein the slot wire segments are substantially radially inserted through the slot openings of the core slots.
29. The stator according to claim 20 , wherein a substantially large subset of the end loop segments define at least one radial shift adjustment per end loop segment to form a cascade winding.