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

Patent metadata

Field	Value
Publication number	US-9660504-B2
Application number	US-201214397368-A
Country	US
Kind code	B2
Filing date	Jul 19, 2012
Priority date	Jul 19, 2012
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

A cooling device mounted in a flow path formed by an internal space of a cooling fluid duct being mounted on the periphery of a frame of a rotating electric machine is configured in such a manner that at least one of the end-face portions between a first end-face portion through which a cooling fluid flows into the cooling device and a second end-face portion from which the cooling fluid flows out thereof is placed tilting with respect to at least one of a first orthogonal surface perpendicular to an inflow direction of the cooling fluid and a second orthogonal surface perpendicular to an outflow direction of the cooling fluid, or with respect to a flow-path-width's direction perpendicular to a direction in which an axis line of a stator extends.

First claim

What is claimed is:

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

Assignees

• Koga Kiyonori
• Akiyoshi Masao
• Mitsubishi Electric Corp

Inventors

• Koga Kiyonori
• Akiyoshi Masao

Classifications

• H02K9/19

  for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil · CPC title

• H02K9/08 Primary

  by gaseous cooling medium circulating wholly within the machine casing (H02K9/10 takes precedence) · CPC title

• H02K9/06 Primary

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

• H02K9/12 Primary

  wherein the cooling medium circulates freely within the casing · CPC title

• H02K9/00

  Arrangements for cooling or ventilating (channels or ducts in parts of the magnetic circuit H02K1/20, H02K1/32; channels or ducts in or between conductors H02K3/22, H02K3/24) · CPC title