Stator winding with increased power density

Patent metadata

Field	Value
Publication number	US-2020366148-A1
Application number	US-201816762128-A
Country	US
Kind code	A1
Filing date	Sep 21, 2018
Priority date	Nov 7, 2017
Publication date	Nov 19, 2020
Grant date	—

Abstract

A stator for an electric alternating current machine includes a stator winding arranged about a central axis and including conductor windings. The conductor windings are grouped to form electrical phases. The stator winding has winding layers. The conductor windings of a phase each have axially oriented conductor limbs that are connected to one another in two axial end regions in pairs by two winding heads. Individual coils are thus formed for each phase. As viewed in a circumferential direction, the axial conductor limbs of the individual phases follow one another in alternation in a uniform order. The winding heads of a given individual coil extend within a winding layer. A sequence of the axial conductor limbs of the respective phases and the distribution of the individual coils on the individual winding layers are chosen to avoid crossovers within the individual winding layers in the region of the winding heads.

First claim

1 . A stator for an electric alternating current machine, the stator comprising:
a stator winding arranged about a central axis and comprising a plurality of conductor windings, wherein the plurality of conductor windings are grouped to form a plurality of electrical phases, wherein the stator winding has a plurality of winding layers, wherein the conductor windings of a phase of the plurality of electrical phases each have a plurality of axially oriented conductor limbs that are connected to one another in two axial end regions in pairs by two winding heads, with the result that a plurality of individual coils are formed for each phase of the plurality of electrical phases, wherein, as viewed in a circumferential direction, the plurality of axially oriented conductor limbs of individual phases of the plurality of electrical phases follow one another in alternation in a uniform pattern, wherein the two winding heads of a given individual coil of the plurality of individual coils extend within a winding layer of the plurality of winding layers, and wherein a sequence of the plurality of axially oriented conductor limbs of the respective phases of the plurality of electrical phase and distribution of the individual coils on individual winding layers of the plurality of winding layers are chosen such that crossovers within the individual winding layers are avoided in a region of the two winding heads.

2 . The stator as claimed in of claim 1 , wherein all individual coils of the plurality of individual coils are each situated completely within a respectively assigned winding layer.

3 . The stator of claim 2 , wherein, for each selected individual coil of the plurality of individual coils that is situated in an assigned winding layer, an axial limb of the respective individual coil overlaps in radial projection with an inner region of another individual coil of the plurality of individual coils that is arranged in another winding layer.

4 . The stator of claim 1 , wherein the stator winding is configured as an air gap winding.

5 . The stator of claim 1 , wherein the plurality of axially oriented conductor limbs of the plurality of individual coils are distributed over a regular occupancy pattern of radial and azimuthal positions.

6 . The stator of claim 5 , wherein a plurality of positions are unoccupied in the regular occupancy pattern.

7 . The stator of claim 6 , wherein coolant ducts are arranged in a region of the plurality of unoccupied positions.

8 . The stator of claim 1 , wherein the stator winding has an even number of winding layers.

9 . The stator of claim 1 , wherein the two winding heads are of U-shaped configuration.

10 . The stator of claim 1 , wherein the two winding heads have bending radii that lie in a range between 5 mm and 100 mm.

11 . The stator of claim 1 , wherein each individual coil of the plurality of individual coils is configured as a saddle-shaped flat coil.

12 . The stator of claim 1 , wherein the stator winding is configured as an unchorded winding.

13 . The stator of claim 1 , wherein the stator winding is configured as a chorded winding.

14 . An electric alternating current machine comprising:
a stator for an electric alternating current machine, the stator comprising:
a stator winding arranged about a central axis and comprising a plurality of conductor windings, wherein the plurality of conductor windings are grouped to form a plurality of electrical phases,
wherein the stator winding has a plurality of winding layers, wherein the conductor windings of a phase of the plurality of electrical phases each have a plurality of axially oriented conductor limbs that are connected to one another in two axial end regions in pairs by two winding heads, with the result that a plurality of individual coils are formed for each phase of the plurality of electrical phases, wherein, as viewed in a circumferential direction, the plurality of axially oriented conductor limbs of individual phases of the plurality of electrical phases follow one another in alternation in a uniform pattern, wherein the two winding heads of a given individual coil of the plurality of individual coils extend within a winding layer of the plurality of winding layers, and wherein a sequence of the plurality of axially oriented conductor limbs of the respective phases of the plurality of electrical phase and distribution of the individual coils on individual winding layers of the plurality of winding layers are chosen such that crossovers within the individual winding layers are avoided in a region of the two winding heads.

15 . The electric machine of claim 14 , further comprising a rotor that is equipped with at least one superconducting excitation winding.

16 . The stator of claim 8 , wherein the even number of winding layers includes two or four winding layers.

Assignees

• Siemens Ag

Inventors

• Frank Michael
• Grundmann Jörn
• Wilke Markus

Classifications

• H02K9/197

  in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator · CPC title

• H02K55/02

  of the synchronous type · CPC title

• H02K3/487

  Slot-closing devices · CPC title

• H02K55/04

  with rotating field windings · CPC title

• H02K1/20

  with channels or ducts for flow of cooling medium · CPC title