Stator for a rotating electrical machine

Patent metadata

Field	Value
Publication number	US-12418218-B2
Application number	US-202217987201-A
Country	US
Kind code	B2
Filing date	Nov 15, 2022
Priority date	Nov 18, 2021
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

A rotary electric machine includes a stator housed in a housing, the stator having a stator body formed by a stack of stator laminations, the laminations are generally non-circular and being angularly offset with respect to each other, so as to form spaces with the housing, the housing having ducts for the flow of a coolant, and said spaces also being used for the flow of the coolant.

First claim

The invention claimed is:

1. A rotary electric machine, comprising:
a stator housed in a housing, the stator comprising a stator body formed by a stack of stator laminations, the laminations being generally non-circular and being angularly offset with respect to each other, so as to form spaces with the housing, the housing comprising ducts for the flow of a coolant, and said spaces also being used for the flow of the coolant, wherein the ducts comprise at least a portion that is situated radially external to the stator body and that is open radially towards the stator body, the portion being at least partially closed in a radial direction from an outside of the machine by a lateral wall of the housing.

2. The machine according to claim 1 , wherein the laminations are substantially polygonal.

3. The machine according to claim 2 , wherein the laminations have truncated corners.

4. The machine according to claim 1 , wherein the laminations of the stator body are coated with a protective coating.

5. The machine according to claim 1 , wherein the coolant is glycol water.

6. The machine according to claim 1 , wherein the stator comprises a winding embedded in resin.

7. The machine according to claim 6 , wherein a part of the winding facing a rotor and furthest from a central plane of the machine, perpendicular to the axis of rotation, is not coated in the resin.

8. The machine according to claim 6 , further comprising a conductive ring positioned between the winding of the stator and the housing.

9. The machine according to claim 6 , further comprising a rotor and a separating liner positioned between the stator winding and the rotor.

10. The machine according to claim 1 , further comprising at least one circuit forming a passage for the coolant around the winding.

11. The machine according claim 10 , wherein the circuit comprises at least one fin configured to send a cooling gas towards a rotor of the machine.

12. The machine according to claim 1 , wherein the housing forms an interior space of the machine, configured to be pressurized.

13. The machine according to claim 12 , wherein the machine comprises an inner fan, which is positioned on a shaft of the machine or on a rotor, on one side of the stator and the rotor, in the interior space of the machine.

14. The machine according to claim 1 , wherein the machine comprises a rotor forming an interior cooling circuit with at least one delivery passage and at least one return passage, through which a cooling gas can pass.

15. The machine according to claim 1 , further comprising at least one end flange, or two end flanges, at least one flange comprising passages for the flow of a coolant.

16. The machine according to claim 15 , wherein the end flange comprises the passages for the flow of a coolant, comprising a plate of material for redirecting a cooling gas coming from a delivery passage of a rotor towards the return passage of the rotor.

17. The machine according to claim 16 , wherein the machine comprises a diffuser insert fastened to the end flange comprising the passages for the flow of a coolant, configured to guide the cooling gas coming from the delivery passage of the rotor towards a plate of material.

18. The machine according to claim 1 , wherein the ducts comprise an inlet of the coolant towards the stator body and an outlet of the coolant.

19. The machine according to claim 1 , wherein the portion is an integral part of the lateral wall of the housing.

20. A rotary electric machine, comprising:
a stator housed in a housing, the stator comprising a stator body formed by a stack of stator laminations, the laminations being generally non-circular and being angularly offset with respect to each other, so as to form spaces with the housing, the housing comprising ducts for the flow of a coolant, and said spaces also being used for the flow of the coolant, wherein the ducts comprise at least a portion defined by a concavity on an internal surface of a lateral wall of the housing, the concavity forming a protrusion on an external surface of the housing, the protrusion being at least partially closed in a radial direction from an outside of the machine by the lateral wall of the housing.

21. The machine according to claim 20 , wherein the ducts comprise an inlet of the coolant towards the stator body and an outlet of the coolant.

22. The machine according to claim 20 , wherein the protrusion is an integral part of the lateral wall of the housing.

Assignees

• Leroy Somer Moteurs

Inventors

• Mcclelland Michael Leo
• Coupart Eric
• Chassara Thierry

Classifications

• H02K9/06

  with fans or impellers driven by the machine shaft · CPC title

• H02K5/20

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

• H02K5/15

  Mounting arrangements for bearing-shields or end plates · CPC title

• H02K1/20 Primary

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

• H02K7/003

  Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28) · CPC title