A stator assembly

Patent metadata

Field	Value
Publication number	US-2025183761-A1
Application number	US-202318836673-A
Country	US
Kind code	A1
Filing date	Feb 7, 2023
Priority date	Feb 8, 2022
Publication date	Jun 5, 2025
Grant date	—

Abstract

A stator assembly includes a stator core including a plurality of teeth and at least one axially extending slot for receiving an electrical conductor disposed between adjacent teeth; and a sealing element extending around at least a part of the circumference of the stator to form at least one bridge portion extending over a radially oriented opening of the at least one slot, to form a fluidic seal over the radially oriented opening. The sealing element includes at least one tooth tip portion extending across at least a part of a substantially radially facing tip of at least one tooth of the stator; at least one bridge section extending circumferentially across the radially oriented opening of the at least one slot and extending radially into the at least one slot. A supplementary sealing element forms a second layer extending around at least part of the circumference of the stator.

First claim

1 . A stator assembly for an electrical machine, the stator assembly comprising:
a stator core comprising a plurality of stator teeth and at least one axially extending slot for receiving an electrical conductor disposed between adjacent stator teeth; and a sealing element forming a first layer extending around at least a part of the circumference of the stator to provide at least one bridge portion extending over a radially oriented opening of the at least one slot, to form a fluidic seal over the radially oriented opening; wherein the sealing element comprises:
at least one tooth tip portion extending across at least a part of a substantially radially facing tip of at least one of the stator teeth;
at least one bridge section extending circumferentially across the radially oriented opening of the at least one slot and extending radially into the at least one slot;
a supplementary sealing element forming a second layer extending around at least part of the circumference of the stator and co-operating with the sealing element to create at least one cavity between the bridge portion and the supplementary sealing element; and a filler material disposed within the at least one cavity formed by an inward extension of the bridge portion into the slot.

2 . The stator assembly of claim 1 , wherein the bridge section comprises at least one radial extension extending radially into the at least one slot of the stator; and/or at least one circumferentially extending bridge section extending circumferentially across the at least one slot.

3 . The stator assembly of claim 1 , wherein the at least one radial extension of the bridge section extends against a radially extending wall of the at least one slot.

4 . The stator assembly of claim 1 , wherein at least two bridge sections of the sealing element are formed continuously with the tooth tip portion of the sealing element therebetween.

5 . The stator assembly of claim 4 , wherein each bridge section of the sealing element is formed continuously with each adjacent bridge section and the tooth tip portion of the sealing element therebetween.

6 . The stator assembly of claim 1 , wherein the sealing element is formed of a single layer of material.

7 . The stator assembly of any claim 1 , wherein the sealing element comprises a composite material.

8 . The stator assembly of claim 7 , wherein the sealing element comprises a fibre-reinforced polymer composite.

9 . The stator assembly of claim 8 , wherein the sealing element comprises glass fibre.

10 . The stator assembly of claim 1 , wherein at least one support member is disposed within and extends across at least one slot of the stator core to support the bridge portion.

11 . (canceled)

12 . The stator assembly of claim 1 , wherein the filler material comprises an expandable material.

13 . The stator assembly of claim 12 , wherein the filler material comprises a syntactic foam.

14 . The stator assembly of claim 1 , further comprising a magnetically permeable material disposed within at least one cavity formed by the inward extension of the bridge portion into the slot.

15 . The stator assembly of claim 1 , wherein the supplementary sealing element is formed of a single layer of material.

16 . The stator assembly of claim 1 , wherein the supplementary sealing element comprises a composite material.

17 . The stator assembly of claim 16 , wherein the supplementary sealing element comprises a fibre-reinforced polymer composite.

18 . The stator assembly of claim 17 , wherein the supplementary sealing element comprises glass fibre.

19 . An electric machine comprising a stator assembly according to claim 1 .

20 . An aircraft comprising the electric machine of claim 19 .

21 . A method of forming a stator assembly for an electrical machine, comprising the steps of:
providing a stator core comprising a plurality of teeth and at least one axially extending slot for receiving an electrical conductor disposed between adjacent teeth; and providing a sealing element extending around at least a part of the circumference of the stator to form at least one bridge portion extending over a radially oriented opening of the at least one slot, to form a fluidic seal over the radially oriented opening, wherein the sealing element comprises: at least one tooth tip portion extending across at least a part of a substantially radially facing tip of at least one tooth of the stator; and at least one bridge section extending circumferentially across the radially oriented opening of the at least one slot and extending radially into the at least one slot; and providing a supplementary sealing element forming a second layer extending around at least part of the circumference of the stator and co-operating with the sealing element to create at least one cavity between the bridge portion and the supplementary sealing element; wherein the sealing element further comprises a filler material disposed within the at least one cavity formed by an inward extension of the bridge portion into the slot.

Assignees

• Safran Electrical & Power

Inventors

• Flower Paul David
• Indge Philip
• Capinha Joana
• Chastagnier Jean-Michel Bernard Paul
• Kelly Anthony

Classifications

• H02K7/1823

  structurally associated with turbines or similar engines · CPC title

• H02K3/24

  with channels or ducts for cooling medium between the conductors · CPC title

• B64D33/08

  of power plant cooling systems · CPC title

• H02K5/203

  specially adapted for liquids, e.g. cooling jackets · CPC title

• H02K9/197 Primary

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