Stator assembly

• US 9,621,011 B2
• Filed: 02/28/2014
• Issued: 04/11/2017
• Est. Priority Date: 02/28/2014
• Status: Active Grant

• Current Assignee: GE Aviation Systems LLC (GE Aerospace)
• Original Assignee: GE Aviation Systems LLC (GE Aerospace)
• Inventors: Wirsch, Jr., Paul James, Koontz, Jr., Winfred Dwight, Mahle, James Patrick
• Primary Examiner(s): Mok, Alex W
• Application Number:
  US14/193,776
• Publication Number:
  US 20150249379A1
• Time in Patent Office: 1,138 Days
• Field of Search: 310 54, 310 52, 310 58
• CPC Class Codes: H02K 5/20 with channels or ducts for flow of cooling medium
• CPC Class Codes: H02K 5/203 specially adapted for liquids, e.g. cooling jackets

Abstract

An electric machine, such as a generator, providing for the generation of electricity and includes a rotor generating a magnetic field and a stator having stator windings. The interaction of the magnetic field with the stator windings generates current in the windings. The generator may provide the generated current to a power output of the generator, where it may be further transmitted to an electrical load to power the load.

Claims

1. A stator assembly for an electric machine comprising:

a stator core having multiple posts;

multiple windings, with a winding provided on each of the posts;

a stator sleeve located about the stator core and an inner surface confronting the windings and comprising;

a convection reservoir extending along and in a thermally conductive confronting relationship with at least a portion of the windings,

a delivery reservoir extending along at least a portion of the length of the convection, and

a plurality of transfer ports fluidly coupling the convection reservoir with the delivery reservoir; and

a thermally conductive sleeve defining the inner surface and confronting the stator core, and defining a second surface, spaced from the inner surface, confronting the stator sleeve, and defining at least a portion of the convection reservoir;

wherein the convection reservoir is located between the delivery reservoir and the inner surface, and the delivery reservoir has an inlet and the convection reservoir has an outlet to define a coolant flow path, whereby coolant can be provided to the inlet where it flows through the delivery reservoir, through the plurality of transfer ports to the convection reservoir, and out the outlet.

2. The stator assembly of claim 1 wherein the convection reservoir is in a thermal conductive relationship with at least one of the stator core or the windings, whereby coolant moving through the coolant flow path conducts heat generated by the windings away from the at least one of the stator core or the windings.

3. The stator assembly of claim 1 wherein the at least one transfer port further comprises at least one impingement port, whereby coolant moving through the at least one impingement port provides for the removal of heat generated by the windings via impingement cooling.

4. The stator assembly of claim 1 wherein the convection reservoir is in a thermal relationship with at least one of the stator core, the windings, or the thermally conductive sleeve, whereby coolant moving through the coolant flow path conducts heat generated by the windings away from the at least one of the stator core, the windings, or the thermally conductive sleeve.

5. The stator assembly of claim 1 wherein the stator sleeve further comprises an inner stator sleeve and an outer stator sleeve.

6. The stator assembly of claim 5 wherein the inner stator sleeve is radially defined by a third surface and a fourth surface spaced from the third surface, wherein the third surface confronts the second surface and defines at least another portion of the convection reservoir, and wherein the fourth surface confronts the outer stator sleeve and defines at least a portion of the delivery reservoir.

7. The stator assembly of claim 6 wherein the outer stator sleeve is radially defined by at least a fifth surface confronting the fourth surface and defining at least a portion of the delivery reservoir.

8. The stator assembly of claim 1 wherein the stator sleeve further comprises an inner stator sleeve and an outer stator sleeve.

9. The stator assembly of claim 8 wherein the inner stator sleeve is radially defined by a second surface and a third surface, spaced from the second surface, wherein the second surface confronts the inner surface and defines at least a portion of the convection reservoir, and wherein the third surface confronts the outer stator sleeve and defines at least a portion of the delivery reservoir.

10. The stator assembly of claim 9 wherein the outer stator sleeve is radially defined by at least a fourth surface confronting the third surface and defining at least a portion of the delivery reservoir.

11. The stator assembly of claim 1 wherein a plurality of transfer ports aligned axially along the length of the stator sleeve define a row of transfer ports.

12. The stator assembly of claim 11 wherein at least one row of transfer ports corresponds to at least one convection reservoir and at least one delivery reservoir.

13. The stator assembly of claim 11 wherein the transfer ports are arranged such that transfer ports of adjacent rows are staggered along the length of the stator sleeve.

14. The stator assembly of claim 1 wherein a cross-sectional area of the transfer ports, relative to the volume of delivery reservoir, is configured such that the delivery reservoir, subject to a given supply rate of coolant, is operably capable of distributing the coolant to all of the transfer ports.

15. A stator assembly for an electric machine comprising:

a stator core having multiple posts;

multiple windings, with a winding provided on each of the posts; and

a stator sleeve located about the stator core and an inner surface confronting the windings and comprising;

a convection reservoir extending along and in a thermally conductive confronting relationship with at least a portion of the windings,

a delivery reservoir extending along at least a portion of the length of the convection reservoir,

a plurality of transfer ports fluidly coupling the convection reservoir with the delivery reservoir, and

an inner stator sleeve and an outer stator sleeve, wherein the inner stator sleeve is radially defined by a second surface and a third surface, spaced from the second surface, wherein the second surface confronts the inner surface and defines at least a portion of the convection reservoir, and wherein the third surface confronts the outer stator sleeve and defines at least a portion of the delivery reservoir;

wherein the convection reservoir is located between the delivery reservoir and the inner surface, and the delivery reservoir has an inlet and the convection reservoir has an outlet to define a coolant flow path, whereby coolant can be provided to the inlet where it flows through the delivery reservoir, through the plurality of transfer ports to the convection reservoir, and out the outlet.

16. The stator assembly of claim 15, wherein the convection reservoir is in a thermal conductive relationship with at least one of the stator core or the windings, whereby coolant moving through the coolant flow path conducts heat generated by the windings away from the at least one of the stator core or the windings.

17. The stator assembly of claim 15, wherein the at least one transfer port further comprises at least one impingement port, whereby coolant moving through the at least one impingement port provides for the removal of heat generated by the windings via impingement cooling.

18. The stator assembly of claim 15, wherein the outer stator sleeve is radially defined by at least a fourth surface confronting the third surface and defining at least a portion of the delivery reservoir.

19. The stator assembly of claim 15, further comprising a thermally conductive sleeve defining the inner surface and confronting the stator core, and defining a second surface, spaced from the inner surface, confronting the stator sleeve, and defining at least a portion of the convection reservoir.

20. The stator assembly of claim 19, wherein the convection reservoir is in a thermal relationship with at least one of the stator core, the windings, or the thermally conductive sleeve, whereby coolant moving through the coolant flow path conducts heat generated by the windings away from the at least one of the stator core, the windings, or the thermally conductive sleeve.