Rotating electric machine including a cooling device for cooling a fluid in the rotating electric machine

1. A rotating electric machine comprising:

a rotor supported being rotationally movable;

a stator including an inner circumferential face opposing to an outer circumferential face of the rotor by means of a gap therebetween;

a frame accommodating in an interior thereof the rotor and the stator, and also sealing in the interior a cooling fluid that cools the rotor and the stator;

at least one cooling fluid duct mounted in a protruding portion on an outer periphery of the frame, communicating with an interior of the frame, the outer periphery facing away from an outer circumferential face of the stator; and

at least one cooling device placed in the at least one cooling fluid duct, for cooling the cooling fluid; the rotating electric machine characterized in that

the at least one cooling device includes a first end-face portion through which the cooling fluid flows into the at least one cooling device, and a second end-face portion formed at a position opposing to the first end-face portion, for flowing the cooling fluid, being cooled, out of the at least one cooling device; and

at least one of the following first item (1) and second item (2) is included:

(1) between the first end-face portion and the second end-face portion, at least one of the end-face portions is placed tilting with respect to a minimum-width's direction of the at least one cooling fluid duct adjacent to the at least one cooling device; and

(2) between the first end-face portion and the second end-face portion, at least one of the end-face portions is placed tilting with respect to at least one of an inflow direction of the cooling fluid and an outflow direction of the cooling fluid.

2. The rotating electric machine as set forth in claim 1 , wherein

the at least one cooling fluid duct comprises

a first cooling fluid duct placed, in an axis-line direction of the stator, in an upper portion of the frame and on one end portion side thereof, and

a second cooling fluid duct placed, being independent of the first cooling fluid duct in an axis-line direction of the stator, in an upper portion of the frame and on the other end portion side thereof;

the at least one cooling device comprises

a first cooling device placed in an internal space of the first cooling fluid duct, and

a second cooling device placed in an internal space of the second cooling fluid duct; and

the first and second cooling devices each include the first end-face portion and the second end-face portion:

between the first end-face portion and the second end-face portion of the first cooling device, one of the end-face portions is placed so as to oppose to an outer circumferential face side of the stator along a direction in which the axis line extends, and the other end-face portion is placed so as to oppose to an inner face portion of the first cooling fluid duct along a direction in which the axis line extends; and

between the first end-face portion and the second end-face portion of the second cooling device, one of the end-face portions is placed so as to oppose to an outer circumferential face side of the stator along a direction in which the axis line extends, and the other end-face portion is placed so as to oppose to an inner face portion of the second cooling fluid duct along a direction in which the axis line extends.

3. The rotating electric machine as set forth in claim 2 , wherein

the first cooling device is placed so that the first end-face portion opposes to the outer circumferential face side of the stator, and the second end-face portion opposes to the inner face portion of the first cooling fluid duct; and

the second cooling device is placed so that the first end-face portion opposes to the outer circumferential face side of the stator, and the second end-face portion opposes to the inner face portion of the second cooling fluid duct.

4. The rotating electric machine as set forth in claim 2 , wherein

the first cooling device is placed so that the second end-face portion opposes to the outer circumferential face side of the stator, and the first end-face portion opposes to the inner face portion of the first cooling fluid duct; and

the second cooling device is placed so that the second end-face portion opposes to the outer circumferential face side of the stator, and the first end-face portion opposes to the inner face portion of the second cooling fluid duct.

5. The rotating electric machine as set forth in claim 1 , wherein

the at least one cooling fluid duct is made of

a first cooling fluid duct continuously formed, in an axis-line direction of the stator, in an upper portion of the frame over a span between both end portions thereof;

the at least one cooling device comprises

first and second cooling devices arranged side by side in, being angled with respect to, a direction in which an axis-line of the stator extends; and

the first and second cooling devices each include the first end-face portion and the second end-face portion:

between the first end-face portion and the second end-face portion of the first and second cooling devices, one of the end-face portions is placed so as to oppose to an outer circumferential face side of the stator, and the other end-face portion is placed so as to oppose to an inner face portion of the first cooling fluid duct.

6. The rotating electric machine as set forth in claim 5 , wherein

the first cooling device is placed so that the first end-face portion opposes to the outer circumferential face side of the stator, and the second end-face portion opposes to the inner face portion of the first cooling fluid duct; and

the second cooling device is placed so that the first end-face portion opposes to the outer circumferential face side of the stator, and the second end-face portion opposes to the inner face portion of the first cooling fluid duct.

7. The rotating electric machine as set forth in claim 5 , wherein

the first cooling device is placed so that the second end-face portion opposes to the outer circumferential face side of the stator, and the first end-face portion opposes to the inner face portion of the first cooling fluid duct; and

the second cooling device is placed so that the second end-face portion opposes to the outer circumferential face side of the stator, and the first end-face portion opposes to the inner face portion of the first cooling fluid duct.

8. The rotating electric machine as set forth in claim 5 , wherein the first and second cooling devices are placed being separated to each other in a direction in which the axis-line extends.

9. The rotating electric machine as set forth in claim 1 , wherein

the at least one cooling fluid duct comprises

a first cooling fluid duct continuously formed, in an axis-line direction of the stator, in an upper portion of the frame over a span between both end portions thereof, and

a second cooling fluid duct continuously formed, in an axis-line direction of the stator, in a lower portion of the frame over a span between both end portions thereof;

the at least one cooling device comprises

first and second cooling devices placed in an internal space of the first cooling fluid duct, and arranged side by side in, being angled with respect to, a direction in which an axis-line of the stator extends, and

third and fourth cooling devices placed in an internal space of the second cooling fluid duct, and arranged side by side in, being angled with respect to, a direction in which an axis-line of the stator extends; and

the first through fourth cooling devices each include the first end-face portion and the second end-face portion:

between the first end-face portion and the second end-face portion of the respective first and second cooling devices, one of the end-face portions is placed so as to oppose to an outer circumferential face side of the stator along a direction in which the axis line extends, and the other end-face portion is placed so as to oppose to an inner face portion of the frame along a direction in which the axis line extends; and

between the first end-face portion and the second end-face portion of the respective third and fourth cooling devices, one of the end-face portions is placed so as to oppose to an outer circumferential face side of the stator along a direction in which the axis line extends, and the other end-face portion is placed so as to oppose to an inner face portion of the frame, or to a floor surface side on which the stator is mounted, along a direction in which the axis line extends.

10. The rotating electric machine as set forth in claim 9 , wherein

the first and second cooling devices is placed so that the first end-face portion opposes to the outer circumferential face side of the stator, and the second end-face portion opposes to an inner face portion of the first cooling fluid duct; and

the third and fourth cooling devices is placed so that the first end-face portion opposes to the outer circumferential face side of the stator, and the second end-face portion opposes to an inner face portion of the second cooling fluid duct, or to a floor surface side on which the stator is mounted.

11. The rotating electric machine as set forth in claim 9 , wherein

the first and second cooling devices is placed so that the second end-face portion opposes to the outer circumferential face side of the stator, and the first end-face portion opposes to an inner face portion of the first cooling fluid duct; and

the third and fourth cooling devices is placed so that the second end-face portion opposes to the outer circumferential face side of the stator, and the first end-face portion opposes to an inner face portion of the second cooling fluid duct, or to a floor surface side on which the stator is mounted.

12. The rotating electric machine as set forth in claim 1 , wherein

the at least one cooling fluid duct comprises

a first cooling fluid duct placed, in an axis-line direction of the stator, in an upper portion of the frame and on one end portion side thereof,

a second cooling fluid duct placed, in an axis-line direction of the stator, in an upper portion of the frame and on the other end portion side thereof,

a third cooling fluid duct placed, in an axis-line direction of the stator, in a lower portion of the frame and on one end portion side thereof, and

a fourth cooling fluid duct placed, in an axis-line direction of the stator, in a lower portion of the frame and on the other end portion side thereof;

the first through fourth cooling fluid ducts are independent of one another;

the at least one cooling device comprises

a first cooling device placed in an internal space of the first cooling fluid duct,

a second cooling device placed in an internal space of the second cooling fluid duct,

a third cooling device placed in an internal space of the third cooling fluid duct, and

a fourth cooling device placed in an internal space of the fourth cooling fluid duct; and

the first through fourth cooling devices each include the first end-face portion and the second end-face portion:

between the first end-face portion and the second end-face portion of the respective first and second cooling devices, one of the end-face portions is placed so as to oppose to an outer circumferential face side of the stator along a direction in which the axis line extends, and the other end-face portion is placed so as to oppose to an inner face portion of the frame along a direction in which the axis line extends; and

between the first end-face portion and the second end-face portion of the respective third and fourth cooling devices, one of the end-face portions is placed so as to oppose to an outer circumferential face side of the stator along a direction in which the axis line extends, and the other end-face portion is placed so as to oppose to an inner face portion of the frame, or to a floor surface side on which the stator is mounted, along a direction in which the axis line extends.

13. The rotating electric machine as set forth in claim 12 , wherein

the first cooling device is placed so that the second end-face portion opposes to the outer circumferential face side of the stator, and the first end-face portion opposes to an inner face portion of the first cooling fluid duct;

the second cooling device is placed so that the second end-face portion opposes to the outer circumferential face side of the stator, and the first end-face portion opposes to an inner face portion of the second cooling fluid duct;

the third cooling device is placed so that the second end-face portion opposes to the outer circumferential face side of the stator, and the first end-face portion opposes to an inner face portion of the third cooling fluid duct, or to a floor surface side on which the stator is mounted; and

the fourth cooling device is placed so that the second end-face portion opposes to the outer circumferential face side of the stator, and the first end-face portion opposes to an inner face portion of the fourth cooling fluid duct, or to a floor surface side on which the stator is mounted.

14. The rotating electric machine as set forth in claim 12 , wherein

the first cooling device is placed so that the first end-face portion opposes to the outer circumferential face side of the stator, and the second end-face portion opposes to an inner face portion of the first cooling fluid duct;

the second cooling device is placed so that the first end-face portion opposes to the outer circumferential face side of the stator, and the second end-face portion opposes to an inner face portion of the second cooling fluid duct;

the third cooling device is placed so that the first end-face portion opposes to the outer circumferential face side of the stator, and the second end-face portion opposes to an inner face portion of the third cooling fluid duct, or to a floor surface side on which the stator is mounted; and

the fourth cooling device is placed so that the first end-face portion opposes to the outer circumferential face side of the stator, and the second end-face portion opposes to an inner face portion of the fourth cooling fluid duct, or to a floor surface side on which the stator is mounted.

15. The rotating electric machine as set forth in claim 1 , wherein

the at least one cooling device comprises a plurality of cooling pipes through which a cooling medium is flowed to cool the cooling fluid, and

the plurality of cooling pipes is placed to extend along the first end-face portion and the second end-face portion, connecting therebetween.

16. The rotating electric machine as set forth in claim 1 , wherein

a rotor's shaft comprises a pair of cooling fans being mounted thereon to oppose to each other in both end portions of the rotor in an axial direction thereof;

the stator comprises a plurality of stator ducts extending in radial directions of the stator, and allowing the gap and an internal space of the frame to communicate with each other; and

the cooling fluid being transported under pressure by means of each of the cooling fans circulates through an interior of the frame, the gap, the plurality of stator ducts and the at least one cooling fluid duct.

17. The rotating electric machine as set forth in claim 1 , wherein an inner face portion of the at least one cooling fluid duct comprises a shape being curved in a direction in which an axis-line of the stator extends.

18. The rotating electric machine as set forth in claim 17 , wherein the at least one cooling fluid duct comprises an outer face portion of the same shape as the inner face portion.

19. The rotating electric machine as set forth in claim 1 , wherein

an inner face portion of the at least one cooling fluid duct comprises

a pair of planar inner lateral-face portions vertically extending and mutually opposing, and

a planar inner upper-face portion being interconnected at upper ends of the pair of inner lateral-face portions, and horizontally extending.

20. The rotating electric machine as set forth in claim 19 , wherein the at least one cooling fluid duct comprises an outer face portion of the same shape as the inner face portion.