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1. (WO2007002216) ENHANCED ELECTRICAL MACHINE COOLING
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CLAIMS:

1. A stator lamination for an electrical machine, comprising:
a central aperture sized to receive a rotor;
a plurality of stator slots disposed about the central aperture and configured to receive a plurality of stator windings; and
a plurality of fins extending radially outward with respect to the stator lamination, the plurality of fins at least partially defining an outer periphery of the stator lamination.

2. The stator lamination as recited in claim 1, wherein radially outermost edges of the stator lamination define a generally polygonal outline.

3. The stator lamination as recited in claim 2, wherein adjacent fins on a side of the stator lamination are generally parallel to one another

4. The stator lamination as recited in claim 1, wherein the stator lamination, excluding the plurality of fins, has a generally circular cross-section defined by the outer periphery of the stator lamination.

5. The stator lamination as recited in claim 1, wherein the plurality of fins substantially surrounds the annular body.

6. An electrical machine, comprising:
a stator core comprising a central chamber and a plurality of stator
laminations, each stator lamination having a plurality of fins extending radially outward with respect to the stator lamination;
a plurality of electrical conductors extending axially through the stator core; a rotor disposed in the central chamber;
first and second endcaps disposed at opposite ends of the stator core; and
a cooling mechanism configured to produce airflow over an outer peripheral surface of the stator core.

7. The electrical machine as recited in claim 6, wherein the cooling mechanism is mechanically coupled to the rotor.

8. The electrical machine as recited in claim 6, wherein the electrical machine is a Totally Enclosed Fan Cooled (TEFC) assembly.

9. The electrical machine as recited in claim 6, wherein the electrical machine is configured for use as a generator.

10. The electrical machine as recited in claim 6, comprising a shroud coupled to the first endcap and configured to direct airflow toward the outer peripheral surface of the stator core.

11. The electrical machine as recited in claim 6, wherein the stator core, excluding the plurality of fins, has a generally cylindrical shape.

12. The electrical machine as recited in claim 6, the stator core having adjacent fins that are generally parallel to one another.

13. The electrical machine as recited in claim 6, wherein the rotor includes a permanent magnet material.

14. An electrical machine, comprising:
a stator core comprising a plurality of stator laminations, each stator lamination being cooperative with adjacent stator laminations to define a central chamber extending axially through the stator core, a plurality of slots disposed about the central chamber and extending axially through the stator core, and a plurality of fins extending radially outward with respect to the stator core, wherein the stator core at least partially defines an outer peripheral surface of the electrical machine;
a plurality of windings disposed in the plurality of slots;
a rotor disposed in the central chamber; and
first and second endcaps disposed at opposite ends of the stator core.

15. The electrical machine as recited in claim 14, comprising a fan configured to produce airflow over the outer peripheral surface of the stator core.

16. The electrical machine as recited in claim 15, wherein the fan is disposed on a rotor shaft of the rotor.

17. The electrical machine as recited in claim 14, wherein the electrical machine is a Totally Enclosed Fan Cooled (TEFC) assembly.

18. The electrical machine as recited in claim 14, wherein fins of the plurality of fins are generally parallel to one another.

19. The electrical machine as recited in claim 14, wherein the rotor comprises a permanent magnetic material.

20. A method for manufacturing a stator of an electrical machine, comprising:
forming a stator lamination having a plurality of fins extending radially outward with respect to the stator lamination and at least partially defining a outer periphery of the stator lamination, a central aperture sized to receive a rotor, and a plurality of slots disposed about the central aperture and configured to receive windings.

21. The method as recited in claim 20, comprising assembling the laminations with respect to one another such that adjacent laminations cooperate to define a central chamber configured to receive a rotor.

22. The method as recited in claim 20, wherein forming comprising stamping the lamination from a material blank.

23. A method of cooling an electrical machine having a stator core, comprising:
routing airflow over a plurality of fins extending radially outward from the stator core and at least partially defining the outer peripheral surface of the stator core.

24. A stator lamination for an electrical machine, comprising:
a central aperture sized to receive a rotor;
a plurality of slots disposed about the central aperture and configured to receive windings;
a outer periphery defining a cross-section of the stator lamination; and
a plurality of protrusions extending radially outward with respect to the stator lamination and at least partially defining the outer periphery, the plurality of protrusions increasing the length of the outer periphery of the lamination than if the stator lamination were generally circular or polygonal in shape.

25. The stator lamination as recited in claim 24, wherein the plurality of protrusions increase the length of the outer periphery by at least ten percent than if the stator lamination were generally circular or polygonal in shape.