JPH09117101A - Electric rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric rotating machine in which high flow rate can be ensured without increasing the size of wind tunnel while enhancing the cooling performance. SOLUTION: The interior of a wind tunnel 22 disposed above a stator frame 23 is partitioned by means of a partitioning plane 46. The right end face in the axial direction of an exhaust air introduction passage 48 in the wind tunnel 22 has upper half part serving as an exhaust port 45 and the lower half part closed by a right end plate 49. The right end plate 49 is bent to incline toward the inside of exhaust air introduction passage 48 and a part 49b extending axially from the upper end toward the partitioning plane 46 is formed integrally therewith. Consequently, the exhaust air introduction passage 48 is sectioned into upper and lower passages 50, 51. Since the upper half part 49a of right end plate 49 is inclining, cross-sectional area of upper passage 50 on the exhaust port 45 side increases gradually toward the exhaust port 45 and the exhaust loss is reduced when the cooling air is exhausted from the exhaust port 45.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric machine in which a wind tunnel is arranged above a stator frame, and the cooling wind is taken into the interior through the wind tunnel and the cooling wind is discharged to the outside.

[0002]

FIG. 9 shows an example of a drip-proof electric motor which is a drip-proof rotary electric machine of this type, for example, a drip-proof type electric machine. The drip-proof electric motor is composed of an electric motor main body 1 and a wind tunnel 2 arranged above the electric motor main body 1.
The electric motor main body 1 is configured by accommodating a stator 5 and a rotor 6 inside an outer shell composed of a stator frame 3 and bearing brackets 4 and 4 mounted on both ends of the stator frame 3. And the rotating shaft 7 of the rotor 6 is attached to the bearing brackets 4, 4
Is rotatably supported by bearings 8, 8 fitted inside the central portion of the. On the upper surface of the stator frame 3, an inflow port 9 is formed at the left end in the figure, and an outflow port 10 is formed at the right end. A cooling fan 11 is fixed to the right end of the rotating shaft 7 so as to face the outflow port 10. When the cooling fan 11 rotates integrally with the rotating shaft 7, the cooling fan 11 moves from the inflow port 9 to the inside of the motor body 1. The cooling air is taken in, and the cooling air is discharged from the outlet 10 to the outside.

The wind tunnel 2 has an intake port 12 formed on both axial end faces, in this case, an upper left end face, and an exhaust port 13 formed on an upper half portion of the right end face. The inside of the wind tunnel 2 is partitioned by a partition surface 14 that is perpendicular to the axial direction, whereby the intake port 12 side portion of the wind tunnel 2 is the intake air guide passage 15, and the exhaust port 13 side portion is the exhaust air guide passage. It is 16.

In the exhaust air guide passage 16, a lower half portion of the right end surface excluding the discharge port 13 is closed by a right end plate 17, and the right end plate 17 extends axially inward from the upper end. The partition 18 is integrally formed. The exhaust air guide passage 16 is divided into an upper passage 16a and a lower passage 16b by the partition portion 18, and the partition portion 18 is provided apart from the partition surface 14, so that the upper and lower passages 16a, 16a,
16b are communicated.

In the electric motor constructed as described above,
When the cooling fan 11 is rotated along with the rotation of the rotating shaft 7, cooling air is sucked from the suction port 12 and is guided to the inflow port 9 of the stator frame 3 through the intake air passage 15. . The cooling air that has flowed into the electric motor body 1 from the inflow port 9 passes through each space to remove the heat generated in each part of the electric motor body 1 and then flows out from the outflow port 10. Then, the cooling air flowing out from the outlet 10 is guided to the discharge port 13 through the exhaust air guide passage 16 and is discharged to the outside from the discharge port 13.

Since the cooling of the electric motor is mainly performed by radiating the cooling air flowing through the inside of the electric motor main body 1, increasing the amount of the cooling air leads to the improvement of the cooling performance. In the drip-proof electric motor, a wind tunnel 2 is provided on the stator frame 3 in order to prevent water droplets such as rain from entering the electric motor main body 1, and the cooling air flowing into the electric motor main body 1 from the outside is sucked. The cooling air taken in through the air guide passage 15 and flowing out from the inside of the electric motor body 1 is discharged to the outside through the exhaust air guide passage 16. Therefore, in order to increase the amount of cooling air flowing in the electric motor main body 1, it is necessary to increase the amount of cooling air flowing in the wind tunnel 2.

In the ventilation system in the wind tunnel 2, the following ventilation losses mainly occur. That is, when the outside cooling air passes through the suction port 12 and flows into the intake air guide passage 15, an inlet loss occurs. In addition, from the outlet 10 to the exhaust air duct 1
The air that has flowed into the inside 6 first flows through the lower passage 16b toward the left side along the stator frame 3. Eventually, this cooling air collides with the partition surface 14 or naturally changes the direction of the flow and enters the upper passage 16a, but when the direction of the flow of the cooling air changes, vortices are generated inside and outside the flow. Ventilation loss such as. Then, the cooling air that has entered the upper passage 16a is directed to the discharge port 13 and discharged from the discharge port 13 to the outside, but at this time, exhaust loss occurs.

In order to reduce such ventilation loss,
Although it suffices to increase the cross-sectional area of each flow path to reduce the flow velocity, in this case, enlarging the wind tunnel 2 causes enlarging of the entire electric motor.

Therefore, an object of the present invention is to provide a rotary electric machine which can obtain a high flow rate without increasing the size of the wind tunnel and can improve the cooling performance.

[0010]

In the rotating electric machine of the present invention, an inlet for introducing cooling air and an outlet for discharging the cooling air to the outside are provided on the upper surface portion at a distance in the axial direction. A stator frame and an air intake guide which is disposed on the upper part of the stator frame and has an intake port and an exhaust port on both end faces in the axial direction and guides cooling air sucked from the intake port to the inflow port of the stator frame. An exhaust air duct for guiding the cooling air exhausted from the outlet of the stator frame to the exhaust port, and the exhaust air duct of the wind tunnel has the exhaust air duct. The air passage is divided into a lower passage that communicates with the outlet and an upper passage that communicates with the discharge port, and a partition portion that connects both upper and lower passages at the end opposite to the discharge port is provided. At least the discharge port side of the upper surface of the portion is inclined or curved to form the upper portion. Having characterized in that the cross-sectional area of the outlet side of the road is constituted so as to gradually increase toward the exhaust outlet (claim 1).

At this time, it is preferable that a partition plate for partitioning the upper passage into a plurality of stages is provided along the partition on the exhaust port side of the upper passage of the exhaust air guide passage (claim 2). Then, of the upper surface of the partition portion of the exhaust air guide passage, the communication portion side between the upper passage and the lower passage may be formed into a convex curved surface (claim 3).
Alternatively, the upper corner portion of the upper passage in the communication passage may be formed into a concave curved surface (claim 4). Alternatively, it is preferable that the communicating portion side between the upper passage and the lower passage is formed into a convex curved surface and the upper corner portion of the upper passage in the communicating passage is formed into a concave curved surface (claim 5).

Further, the rotating electric machine of the present invention includes a stator frame having an inlet on which the cooling air is taken in and an outlet for discharging the cooling air to the outside, which is provided on the upper surface at a distance in the axial direction. ,
The intake air guide passage, which is arranged at the upper part of the stator frame and has an intake port and an exhaust port on both end faces in the axial direction, and which guides the cooling air sucked from the intake port to the inlet port of the stator frame, The wind tunnel is divided into an exhaust air guide for guiding the cooling air discharged from the outlet of the child frame to the outlet, and the inlet of the wind tunnel is formed in a tubular shape, and the cross-sectional area of the inlet is set to the wind. It is characterized in that it is configured so as to gradually increase toward the outside of the trunk (claim 6).

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment in which the present invention is applied to a drip-proof electric motor will be described below with reference to FIG. The drip-proof electric motor is composed of an electric motor main body 21 and a wind tunnel 22 arranged above the electric motor main body 21, and in FIG.
The lower half of the electric motor main body 21 is omitted.

First, the outer shell of the electric motor main body 21 is composed of a stator frame 23 made of a steel plate and bearing brackets 24, 24 attached to both ends of the stator frame 23. A bearing 25 is mounted inside the central portions of the bearing brackets 24, 24, and a rotary shaft 26 is rotatably supported by the bearing 25. The upper surface of the stator frame 23 is provided with an inflow port 27 at the left end portion in the drawing and an outflow port 28 at the right end portion in the drawing at a distance in the axial direction.

The inlet 27 is formed on the inner peripheral surface of the stator frame 23.
And a rib 29 which is located between the outflow port 28 and projects inward and extends in the axial direction. The stator 30 is moved toward the inflow port 27 side so as to be inscribed in the inner end portion of the rib 29. It is arranged. In this stator 30, an iron core block 31 and a large number of plate-shaped first spacers 32 extending in the radial direction and intermittently arranged in the circumferential direction are alternately arranged in the axial direction, and these are arranged in the stator. The pressing plate 33 is integrally configured. As a result, the stator 30 has a structure in which the first ventilation ducts 34 are formed between the iron core blocks 31 by the first spacers 32. Reference numeral 35 is a stator coil wound around the stator 30.

A rotor 36 is arranged inside the stator 30. The rotor 36 includes an iron core block 37,
A large number of second spacers 38 extending in the radial direction and intermittently arranged in the circumferential direction are alternately arranged in the axial direction, and these are integrated by a clamp (not shown). By this arrangement, each core block 37 is formed. Second ventilation duct 3 between
9 is formed.

In this case, the iron core block 37 of the rotor 36 is supported by the rotary shaft 26 via a large number of rib members 40 arranged so as to project radially around the rotary shaft 26. The member 40 forms an intake duct 41 that communicates with the second ventilation duct 39.
A partition member 42 is arranged between the rib members 40 so that the air that has flowed into the intake duct 41 from the end surface on the inlet 27 side (the left end surface in the drawing) is directed to the second ventilation duct 39.

A cooling fan 43 is fixed to the right end portion of the rotary shaft 26 so as to face the outlet 28 and rotates integrally with the rotary shaft 26. By the rotation of the cooling fan 43, the cooling air is taken into the electric motor main body 21 from the inflow port 27 and the cooling air flows out from the outflow port 28.

On the other hand, the wind tunnel 22 is disposed above the stator frame 23, and has axially opposite end faces, in this case, the stator frame 23.
Corresponding to the inlet 27 of the suction port 44 at the upper left end face,
A discharge port 45 is formed in the upper part of the right end face corresponding to the outflow port 28. Further, the inside of the wind tunnel 22 is partitioned by a partition surface 46 provided at a position which is perpendicular to the axial direction and substantially coincides with the end surface of the stator 30 on the inlet 27 side. As a result, the intake port 44 side portion of the wind tunnel 22 is the intake air guide passage 47, and the exhaust port 45 side portion is the exhaust air guide passage 48. In addition, the intake port 44 is provided at the intake port 44.
A cylindrical portion 44a extending in the axial direction toward the inside is provided.

In the exhaust air guide passage 48, the lower half of the axial right end surface except the above-described exhaust port 45 is closed by the right end plate 49. The right end plate 49 is bent such that an upper half portion 49a is inclined toward the inside of the exhaust air guide passage 48, and an extension portion 49b extending from the upper end toward the partition surface 46 in the axial direction is formed. It is formed integrally. As a result, the exhaust air guide passage 48 is divided into the upper passage 50 and the lower passage 51, and the extending portion 49b has a distance (hereinafter, this portion is referred to as the communicating portion 52) from the partition surface 46. By being provided, the upper passage 50 and the lower passage 51 communicate with each other. Therefore, the upper half portion 49a and the extending portion 49b of the right end plate 49 correspond to the partition portion in the present invention.

Next, the operation of this embodiment will be described. When the electric motor is activated, the rotor 36 rotates. When the cooling fan 43 rotates accordingly, the cooling air is sucked into the intake air guide path 47 from the suction port 44 by the fan action.
This cooling air flows toward the stator frame 23. continue,
The cooling air taken into the electric motor main body 21 from the inflow port 27 passes through each second ventilation duct 39 of the rotor 36 via the intake duct 41, and further reaches the air gap on the outer periphery of the rotor 36. Each first ventilation duct 34 of the stator 30
And flows into the space between the ribs 29. The cooling air that has flowed into the space between the stator 30 and the cooling fan 43 from the space between the ribs 29 is discharged from the outlet 28 to the exhaust air guide passage 48 by the fan action of the cooling fan 43. The stator 30 and the stator coil 35 are cooled by such circulation of the cooling air.

On the other hand, the cooling air discharged to the exhaust air guide passage 48 first flows through the lower passage 51 toward the partition surface 46. At this time, since the partition surface 46 is provided so as to substantially coincide with the end surface of the stator 30 on the inlet port 27 side, the cooling air flowing through the lower passage 51 fixes the portion where the rib 29 is disposed on the inner surface. The heat flows between the stator frame 23 and the upper surface of the child frame 23, and heat is exchanged with the stator frame 23. Eventually, the cooling air flowing through the lower passage 51 collides with the partition surface 46 or naturally changes its flow, passes through the communicating portion 52, and travels toward the upper passage 50. The cooling air that has entered the upper passage 50 flows toward the discharge port 45 and is discharged from the discharge port 45 to the outside. At this time, since the upper half portion 49a of the right end plate 49 is bent inward, the cross-sectional area of the upper passage 50 corresponding to the upper half portion 49a gradually increases toward the discharge port 45. Therefore, the average flow velocity of the cooling air before passing through the exhaust port 45 can be gradually reduced, and the exhaust loss, which is the pressure loss at the exhaust port 45, is reduced.

As described above, according to this embodiment, of the pressure loss generated in each flow path of the wind tunnel 22, the exhaust loss generated at the exhaust port 45 can be reduced, and the ventilation in the exhaust air guide passage 48 can be reduced accordingly. As a result, the amount of ventilation increases in the motor body 21 and the cooling performance improves. Therefore, it is possible to improve the cooling performance without increasing the size of the wind tunnel 22.

FIG. 2 shows a second embodiment of the present invention, which is different from the above-mentioned first embodiment in the following points.
That is, in the right end plate 61 of the exhaust air guide passage 48, the portion extending from the upper half portion 61a to the extending portion 61b is curved toward the upper passage 50 side. Therefore, in the present embodiment, the following operational effects are obtained in addition to the operational effects of the first embodiment described above. That is, since the cooling air flowing through the upper passage 50 can smoothly transition from the extended portion 61b portion to the upper half portion 61a, generation of vortices near the upper half portion 61a of the right end plate 61 is suppressed. As a result, ventilation loss is reduced and cooling performance can be improved.

FIG. 3 shows a third embodiment of the present invention, which is different from the above-described first embodiment in the following points.
That is, the exhaust port 45 of the upper passage 50 of the exhaust air guide passage 48.
That is, two partition plates 62 for partitioning the upper passage 50 into a plurality of upper and lower stages, in this case three stages, are provided on the side. These partition plates 62 have a shape conforming to the shapes of the upper half portion 49a and the extension portion 49b so as to equally divide the cross-sectional area of the upper passage 50, and the extension portion 49b of the right end plate 49 from the discharge port 45.
Is provided so as to extend to the vicinity of about one third of the length.

Increasing the cross-sectional area of the upper passage 50 in the vicinity of the exhaust port 45 reduces exhaust loss, but on the other hand, since the flow velocity of the cooling air flowing through this portion is reduced, the cooling air flows inside the upper passage 50. Ventilation loss increases due to flow disturbance such as separation from the wall surface and generation of vortices.

However, in the present embodiment, the cooling air passing through the portion of the upper passage 50 where the cross-sectional area gradually increases toward the discharge port 45, the inner wall surface and the partition plate 62 are cooled.
Since it flows along, the generation of vortices is reduced. as a result,
The ventilation loss can be reduced as compared with the first embodiment, which is more effective.

In this embodiment, the partition plate 62 is provided so as to evenly divide the cross-sectional area of the upper passage, but it may be provided so as to be not evenly divided. In short, the partition plate 62 serves to straighten the cooling air. It will be good if it comes to present.

FIG. 4 shows a fourth embodiment of the present invention,
The following points are different from the first embodiment described above. That is, in the extending portion 63 of the right end plate 49, the communicating portion 52 side and the upper passage 50 side are formed into a convex curved surface 63a. In this case, when the cooling air flows from the lower passage 51 through the communication portion 52 to the upper passage 50, in particular, the cooling air flowing inside (on the discharge port 45 side) smoothly flows along the curved surface 63 a of the extending portion 63. Since the direction of the flow can be changed, the generation of vortices on the discharge port 45 side of the communicating portion 52 is reduced as compared with the case of the first embodiment. Therefore, since the ventilation loss is reduced, the ventilation amount can be increased and the cooling performance is improved.

FIG. 5 shows a fifth embodiment of the present invention,
The following points are different from the first embodiment described above. That is, the upper corner portion 64 of the upper passage 50 in the communication portion 52.
Is formed on the concave curved surface 64a. In this case, particularly when the cooling air flows from the lower passage 51 through the communication portion 52 to the upper passage 50, the outside (the intake air guide passage 47
Since the cooling air flowing through (side) can smoothly change the flow direction along the curved surface 64a of the upper corner portion 64,
As compared with the case of the first embodiment, the generation of vortices outside the communicating portion 52 is reduced. Therefore, since the ventilation loss is reduced, the ventilation amount can be increased and the cooling performance is improved.

FIG. 6 shows a sixth embodiment of the present invention.
This embodiment is a combination of the above-described fourth and fifth embodiments, that is, in the extending portion 63 of the right end plate 49, the communicating surface 52 side and the upper passage 50 side are convex curved surfaces. 6
3a, the upper corner portion 64 of the upper passage 50 in the communicating portion 52 has a concave curved surface 64a.
Is formed. In this case, when the cooling air flows from the lower passage 51 through the communication portion 52 to the upper passage 50, the inside (the exhaust port 45 side) and the outside (the intake air guide passage 47 side) are formed.
Since the cooling air flowing in any of the above can smoothly change its direction along the curved surfaces 63a and 64a,
The generation of vortices is further reduced as compared with the case of the embodiment.
Therefore, since the ventilation loss is reduced, the ventilation amount can be increased and the cooling performance is improved.

FIG. 7 shows a seventh embodiment of the present invention,
The following points are different from the first embodiment described above. That is, the cylindrical portion 65 provided at the intake port 44 of the intake air guide passage 47.
That is, the cross-sectional area of is gradually increased toward the outside of the intake air guide passage 47. In this case, the outer portion of the tubular portion 65 is a tapered surface 65a. The shape of the corner of the suction port 44 has a great influence on the inlet loss,
When the angle of the inlet is sharp, the flow contracts at the inlet and then spreads again in the cylindrical portion 65, so that the inlet loss increases. However, in the present embodiment, since the angle of the suction port 44 becomes an obtuse angle due to the tapered surface 65a, the cooling air is cooled by the tapered surface 65a.
Since the air flows into the intake air guide path 47 along a, the inlet loss can be reduced. In this case, as in the case of the eighth embodiment shown in FIG. 8, if the outer surface of the tubular portion 65 is formed into a curved surface (bellmouth shape) 65b instead of the tapered surface 65a, the cooling air will flow even more smoothly. Since it flows in from 44, the inlet loss can be reduced.

The present invention is not limited to the embodiments described above and shown in the drawings, and the following expansions and modifications are possible. The structure in the wind tunnel 22 is not limited to the structure shown in the above-mentioned embodiment, and all the structures for reducing the pressure loss performed in each part of the intake air guide path 47 and the exhaust air guide path 48 may be combined. In this case, the pressure loss can be further reduced. Further, the present invention is not limited to the drip-proof type rotary electric machine, but can be widely applied to general rotary electric machines in which the wind tunnel is arranged above the stator.

[0034]

As is apparent from the above description, the rotating electric machine of the present invention has the following effects. By reducing the pressure loss generated when the cooling air flows through the wind tunnel arranged above the stator frame, the flow rate of the cooling air increases. As a result, the amount of cooling air taken into the stator frame increases, so that the cooling performance is improved without enlarging the wind tunnel.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of the overall configuration showing a first embodiment of the present invention.

FIG. 2 is a view corresponding to FIG. 1 showing a second embodiment.

FIG. 3 is a view corresponding to FIG. 1 showing a third embodiment.

FIG. 4 is a view corresponding to FIG. 1 showing a fourth embodiment.

FIG. 5 is a view corresponding to FIG. 1 showing a fifth embodiment.

FIG. 6 is a view corresponding to FIG. 1 showing a sixth embodiment.

FIG. 7 is a view corresponding to FIG. 1 showing a seventh embodiment.

FIG. 8 is a view corresponding to FIG. 1 showing an eighth embodiment.

FIG. 9 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

22 is a wind tunnel, 23 is a stator frame, 27 is an inlet, 28 is an outlet, 44 is an inlet, 44a and 65 are cylindrical portions, 45 is an outlet, 47 is an intake air guide passage, 48 is an exhaust air guide. Road, 49a, 6
1a is an upper half part (partition part), 49b, 61b, 63 are extended parts (partition part), 50 is an upper passage, 51 is a lower passage, 52
Is a communicating portion, 63a is a curved surface, 64 is an upper corner portion, 64a
Indicates a curved surface.

Claims (6)

[Claims] 1. A stator frame in which an inlet for taking in cooling air and an outlet for discharging the cooling air to the outside are provided on an upper surface portion at a distance in the axial direction, and an upper portion of the stator frame. Has an inlet and an outlet on both end faces in the axial direction, and guides cooling air sucked from the inlet to the inlet of the stator frame and the outlet of the stator frame. An exhaust air duct that guides the cooling air discharged from the exhaust port to an exhaust port, and a wind tunnel that is partitioned into an exhaust air duct of the wind tunnel, and a lower passage that connects the exhaust air duct to the outlet. And an upper passage communicating with the discharge port, and a partitioning part that connects the upper and lower passages to each other at the end opposite to the discharge port is provided, and at least the discharge port side of the upper surface of the partitioning part is provided. The cross-sectional area on the outlet side of the upper passage is inclined or curved so that Headed rotary electric machine, characterized by being configured to gradually increase. 2. The exhaust passage of the upper passage of the exhaust air duct is provided with:
The rotary electric machine according to claim 1, wherein a partition plate for partitioning the upper passage into a plurality of stages is provided along the partition portion. 3. A stator frame in which an inlet for taking in cooling air and an outlet for discharging the cooling air to the outside are provided on an upper surface portion at a distance in the axial direction, and an upper portion of the stator frame. Has an inlet and an outlet on both end faces in the axial direction, and guides cooling air sucked from the inlet to the inlet of the stator frame and the outlet of the stator frame. An exhaust air duct that guides the cooling air discharged from the exhaust port to an exhaust port, and a wind tunnel that is partitioned into an exhaust air duct of the wind tunnel, and a lower passage that connects the exhaust air duct to the outlet. And an upper passage communicating with the discharge port, and a partition is formed to form the communication passages of the upper and lower passages at the end opposite to the discharge port. A rotating electric machine, characterized in that the communication passage side is formed into a convex curved surface. 4. A stator frame in which an inlet for taking in cooling air and an outlet for discharging the cooling air to the outside are provided on an upper surface portion at a distance in the axial direction, and an upper portion of the stator frame. Has an inlet and an outlet on both end faces in the axial direction, and guides cooling air sucked from the inlet to the inlet of the stator frame and the outlet of the stator frame. An exhaust air duct for guiding the cooling air discharged from the exhaust port to an exhaust port, and a wind tunnel partitioned into an exhaust air duct, the exhaust air duct of the wind tunnel being a lower passage connecting the exhaust air duct to the outlet. And an upper passage communicating with the discharge port, the communication passages of the upper and lower passages are formed at the ends opposite to the discharge port, and the upper corner portion of the upper passage in the communication passage is formed into a concave shape. A rotating electric machine characterized by being formed on a curved surface. 5. A stator frame in which an inlet for taking in cooling air and an outlet for discharging the cooling air to the outside are provided on an upper surface portion at a distance in the axial direction, and an upper portion of the stator frame. Has an inlet and an outlet on both end faces in the axial direction, and guides cooling air sucked from the inlet to the inlet of the stator frame and the outlet of the stator frame. An exhaust air duct that guides the cooling air discharged from the exhaust port to an exhaust port, and a wind tunnel that is partitioned into an exhaust air duct of the wind tunnel, and a lower passage that connects the exhaust air duct to the outlet. And an upper passage communicating with the discharge port, and a partition is formed to form the communication passages of the upper and lower passages at the end opposite to the discharge port. The communicating passage side is formed into a convex curved surface, and the upper corner of the upper passage in the communicating passage is formed. Rotating electric machine, wherein a part formed in a concave curved surface. 6. A stator frame in which an inlet for taking in cooling air and an outlet for discharging the cooling air to the outside are provided on an upper surface portion at a distance in the axial direction, and an upper portion of the stator frame. Has an inlet and an outlet on both end faces in the axial direction, and guides cooling air sucked from the inlet to the inlet of the stator frame and the outlet of the stator frame. An air duct for guiding the cooling air exhausted from the air duct to the exhaust port, and a wind tunnel partitioned into the air duct, and the intake port of the wind tunnel is formed in a tubular shape, and its cross-sectional area is directed toward the outside of the wind tunnel. A rotating electric machine characterized by being configured so as to become gradually larger.