Liquid cooled switched reluctance electric machine

• US 20060043801A1
• Filed: 08/27/2004
• Published: 03/02/2006
• Est. Priority Date: 08/27/2004
• Status: Abandoned Application

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Adra, Rodwan T.
• Application Number:
  US10/927,481
• Publication Number:
  US 20060043801A1
• Time in Patent Office: Days
• US Class Current: 310/54
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors
• CPC Class Codes: H02K 37/04 with rotors situated within the stators

Abstract

A switched reluctance electric machine has a shaft and a rotor connected to the shaft. The electric machine also has a stator axially aligned with the rotor and disposed radially outward from the rotor. The stator has a plurality of teeth, a winding of wire disposed around each of the plurality of teeth to form a plurality of poles, and at least one tube. The at least one tube is disposed between the windings of wire associated with adjacent poles of the plurality of poles and is configured to hold a heat-transferring medium. The switched reluctance electric machine further has a housing enclosing the shaft, rotor, and stator.

Claims

1. A switched reluctance electric machine, comprising:

a shaft;

a rotor connected to the shaft;

a stator axially aligned with the rotor and disposed radially outward from the rotor, the stator having;

a plurality of teeth having a rectangular portion;

a winding of wire disposed around each of the rectangular portions of the plurality of teeth to form a plurality of poles and a plurality of triangular voids, the voids being formed between adjacent windings about a radially outer portion of the stator; and

at least one tube disposed within the triangular voids between the windings of wire associated with adjacent poles of the plurality of poles and configured to hold a heat-transferring medium; and

a housing enclosing the shaft, rotor, and stator.

4. The switched reluctance electric machine of claim 1, wherein the at least one tube has a triangular cross-section.

5. The switched reluctance electric machine of claim 1, wherein the at least one tube includes a plurality of tubes, one of the plurality of tubes being disposed between the windings of wire associated with each of the plurality of poles.

6. The switched reluctance electric machine of claim 5, further including at least one manifold fluidly connected to an end of each of the plurality of tubes.

7. The switched reluctance electric machine of claim 6, wherein the at least one manifold is a first manifold and the electric machine further includes a second manifold fluidly connected to an opposite end of each of the plurality of tubes relative to the first manifold.

8. The switched reluctance electric machine of claim 7, further including:

an inlet port protruding from the housing and fluidly connected to first manifold; and

an outlet port protruding from the housing and fluidly connected to the second manifold.

9. The switched reluctance electric machine of claim 7, wherein at least one of the first and second manifolds is in substantial contact with of the winding of wire of each of the plurality of poles between axial ends of the windings.

10. The switched reluctance electric machine of claim 1, wherein the windings of wire and the at least one tube are bonded together during assembly.

11. The switched reluctance electric machine of claim 10, wherein the windings of wire and the at least one tube disposed therebetween are bonded with a thermally conductive epoxy material.

12. The switched reluctance electric machine of claim 1, further including a sleeve annularly surrounding the stator and having at least one fluid passageway, the sleeve configured to transfer heat with the stator.

2. A switched reluctance electric machine, comprising:

a shaft;

a rotor connected to the shaft;

a stator axially aligned with the rotor and disposed radially outward from the rotor, the stator having;

a Plurality of teeth;

a winding of wire disposed around each of the plurality of teeth to form a Plurality of poles; and

at least one tube disposed between the windings of wire associated with adjacent poles of the Plurality of poles and configured to hold a heat-transferring medium; and

a housing enclosing the shaft, wherein the at least one tube includes a single tube routed through the stator such that portions of the tube are disposed between the windings of wire associated with each of the plurality of poles.

3. The switched reluctance electric machine of claim 2, wherein the single tube includes a plurality of bends, each of the plurality of bends being in substantial contact with an end of the winding wire of each of the plurality of poles.

13. A method of operating a switched reluctance electric machine, comprising:

rotating a rotor within a stationary stator having a plurality of teeth having a rectangular portion;

a wire disposed around each of the rectangular portions of the teeth to form a plurality of poles;

forming a Plurality of triangular voids between adjacent windings about a radially outer portion of the stator; and

directing a heat-transferring medium through at least one tube disposed between the windings of wire associated with adjacent poles of the plurality of poles.

14. The method of claim 13, wherein the heat-transferring medium is cooled prior to direction through the at least one tube to remove heat from the stator.

15. The method of claim 13, wherein the heat-transferring medium is heated prior to direction through the at least one tube to add heat to the stator.

16. The method of claim 13, wherein the at least one tube includes a plurality of tubes and the heat-transferring medium is directed into the plurality of tubes in parallel relation, via an inlet manifold fluidly connected to each of the plurality of tubes.

17. The method of claim 16, further including directing the heat-transferring medium out of each of the plurality of tubes via an outlet manifold in fluid communication with each of the plurality of tubes, the outlet manifold being located on an end of the plurality of tubes opposite the inlet manifold.

18. The method of claim 13, further including directing the heat-transferring medium from the at least one tube to a cooling system to condition the heat-transferring medium.

19. The method of claim 13, further including directing the heat-transferring medium through at least one fluid passageway in a sleeve annularly surrounding the stator.

20. A power system, comprising:

a switched reluctance electric machine, including;

a shaft;

a rotor connected to the shaft;

a stator axially aligned with the rotor and disposed radially outward from the rotor, the stator having;

a plurality of teeth having a rectangular portion;

a winding of wire disposed around each of the rectangular portions of the plurality of teeth to form a plurality of poles and a plurality of triangular voids, the voids being formed between adjacent windings about a radially outer portion of the stator; and

at least one tube disposed within the triangular voids between the windings of wire associated with adjacent poles of the plurality of poles and configured to hold a heat-transferring medium; and

a housing enclosing the shaft, rotor, and stator; and

a cooling system fluidly connected to the at least one tube and configured to condition a heat-transferring medium directed through the at least one tube.

23. The power system of claim 20, wherein each of the plurality of tubes has a triangular cross-section.

24. The power system of claim 20, wherein the at least one tube includes a plurality of tubes, one of the plurality of tubes being disposed between the windings of wire associated with each of the plurality of poles.

25. The power system of claim 24, further including at least one manifold fluidly connected to an end of each of the plurality of tubes.

26. The power system of claim 25, wherein the at least one manifold is a first manifold and the electric machine further includes a second manifold fluidly connected to an opposite end of each of the plurality of tubes relative to the first manifold.

27. The power system electric machine of claim 26, wherein at least one of the first and second manifolds is in substantial contact with of the windings of wire of each of the plurality of poles between axial ends of the windings.

28. The power system of claim 26, further including:

an inlet port protruding from the housing and fluidly connected to one of the first and second manifolds; and

an outlet port protruding from the housing and fluidly connected to the other of the first and second manifolds.

29. The power system of claim 20, wherein the stator windings and the at least one tube disposed therebetween are bonded together during assembly.

30. The power system of claim 20, wherein the stator windings and the at least one tube are bonded with a thermally conductive epoxy material.

31. The power system of claim 20, wherein the electric machine further includes a sleeve annularly surrounding the stator and having at least one fluid passageway, the sleeve configured to transfer heat with the stator.

32. The power system of claim 20, wherein the cooling system is further connected to an internal combustion engine to condition a heat-transferring medium within the internal combustion engine.

21. A power system, comprising:

a switched reluctance electric machine, including;

a shaft;

a rotor connected to the shaft;

a stator axially aligned with the rotor and disposed radially outward from the rotor, the stator having;

a Plurality of teeth;

a winding of wire disposed around each of the plurality of teeth to form a plurality of poles; and

at least one tube disposed between the windings of wire associated with adjacent poles of the plurality of poles and configured to hold a heat-transferring medium; and

a housing enclosing the shaft, rotor, and stator; and

a cooling system fluidly connected to the at least one tube and configured to condition a heat-transferring medium directed through the at least one tube, wherein the at least one tube includes a single tube routed through the stator such that portions of the tube are disposed between the windings of wire associated with each of the plurality of poles.

22. The switched reluctance electric machine of claim 21, wherein the single tube includes a plurality of bends, each of the plurality of bends being in substantial contact with an end of the winding wire of each of the plurality of poles.