JP3465661B2 - Rotating electric machine - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a rotating electric machine,
In particular, the present invention relates to a rotating electric machine in which a cooler is installed in a ventilation passage through which a cooling medium flows.

[0002]

2. Description of the Related Art A conventional rotary electric machine is disclosed in, for example, Japanese Patent Laid-Open No. 60-16
As described in JP-A-2432, JP-A-2-70247, etc.,
A ventilation passage through which the cooling medium flows is formed line-symmetrically with respect to the rotation axis and an axis perpendicular to the rotation axis, and a cooler for cooling the cooling medium is line-symmetric with respect to the axis perpendicular to the rotation axis A plurality of them were installed on top of each other, and each cooling device had the same cooling capacity.

[0003]

However, in the conventional rotating electric machine in which the cooler is installed as described above, when the heat load increases with the increase in the power generation capacity, the rotating electric machine changes according to the distance from the cooler. A large temperature difference is generated in the cooling medium, and a local heat generating portion is generated inside the machine, particularly in a gap between the stator core and the rotor core, that is, an air gap. If a local heat-generating portion is generated in the air gap, uneven heat expansion may occur in the axial direction of the rotor, and the thermal vibration stroke of the rotor may be increased.

As a solution to the above problem, it is possible to increase the heat exchange capacity of the cooler, that is, increase the size of the cooler. However, with this solution, although the absolute value of the temperature rise distribution in the axial direction of the air gap and the local absolute value of heat generation can be reduced, simply increasing the heat exchange capacity of the cooler can reduce the axial direction of the air gap. It is not possible to equalize the temperature rise distribution. Further, in this solving means, since this portion is cooled even though it is sufficiently cooled and it is not necessary to cool it, it cannot be said that the cooling air is effectively utilized.

The present invention has been made in view of the above circumstances, and equalizes the temperature rise distribution in the machine, and causes non-uniform heat expansion in the axial direction of the rotor to increase the thermal vibration stroke of the rotor. The present invention provides a rotating electric machine that does not have any problems.

[0006]

The basic feature of the present invention is that a main cooler and a sub cooler are installed, and at least a part of the cooling medium cooled by the main cooler is further subordinated. It is configured to be cooled by the cooler. That is, the cooling medium is 2
It is configured to be cooled once. As a result, it is possible to supply a cooling medium that is sufficiently cooled in the axial direction of the gap between the stator and the rotor, the so-called air gap, and suppress local heat generation in the axial direction of the air gap. The temperature rise distribution in the axial direction of the gap can be equalized.

The sub-cooler is smaller than the main cooler, that is, has a smaller cooling capacity. That is, since a part of the cooling medium cooled by the main cooler is cooled, the cooling capacity thereof can be small, and the cooling efficiency is better. Further, the sub-cooler is arranged in the middle of the duct that branches from the exhaust side of the fan to the outer peripheral side of the stator core, that is, is arranged in a space smaller than the space in which the main cooler is arranged. Therefore, it cannot be placed unless it is small. Therefore, in view of the appearance of the rotary electric machine, a large-sized cooler, that is, a main cooler and a small-sized cooler, that is, a sub-cooler are arranged in a line in the axial direction.

The first aspect of the present invention is a rotary electric machine provided with a cooler for cooling a cooling medium enclosed in the machine, the coolers being arranged at both axial ends of the rotary electric machine. And a second cooler that is arranged between at least the first cooler and is smaller than the first cooler.

A second aspect of the present invention is a rotary electric machine provided with a cooler for cooling a cooling medium enclosed in a machine, wherein a plurality of the coolers are arranged in an axial direction of the rotary electric machine. One cooler and a second cooler arranged between each first cooler and smaller than the first cooler.

In the rotary electric machine according to the first or second aspect of the invention, the cooler is arranged above the rotary electric machine.

According to a third aspect of the present invention, a cooling medium is provided in a ventilation passage of a cooling medium which is circulated in the machine by the rotation of an axial fan which is provided on a rotary shaft and is arranged so as to flow air toward a central portion of the shaft. A rotating electric machine equipped with a cooler for cooling
Two or more such coolers are provided, and at least a part of the cooling medium cooled by one cooler is further cooled by another cooler.

According to a fourth aspect of the present invention, a cooling medium is provided in a ventilation passage of a cooling medium that is circulated in the machine by the rotation of an axial fan provided on the rotating shaft so that the air flows toward the central portion of the shaft. A rotating electric machine equipped with a cooler for cooling
The cooler is fixed from the exhaust side of the fan installed on the rotating shaft
The first air passage is installed in a first ventilation path that goes through the air gap between the child core and the rotary shaft, and further passes through the fixed iron core from the inner peripheral side to the outer peripheral side to the intake side of the fan. Cooler of the first
And a second cooler installed in a second air passage branched from the air passage.

According to a fifth aspect of the present invention, a cooling medium is provided in a ventilation passage of a cooling medium which is circulated in the machine by the rotation of an axial fan which is provided on a rotary shaft and is arranged so as to flow air toward a central portion of the shaft. A rotating electric machine equipped with a cooler for cooling
The cooler is fixed from the exhaust side of the fan installed on the rotating shaft
The first air passage is installed in a first ventilation path that goes through the air gap between the child core and the rotary shaft, and further passes through the fixed iron core from the inner peripheral side to the outer peripheral side to the intake side of the fan. Cooler of the first
And a second cooler installed at the confluent portion of the second ventilation passage where the other ventilation passage merges on the way.

According to a sixth aspect of the present invention, a cooling medium is provided in a ventilation passage of a cooling medium which is circulated in the machine by the rotation of an axial fan provided so as to flow air toward a central portion of the shaft. A rotating electric machine equipped with a cooler for cooling
The cooler is fixed from the exhaust side of the fan installed on the rotating shaft
The first air passage is installed in a first ventilation path that goes through the air gap between the child core and the rotary shaft, and further passes through the fixed iron core from the inner peripheral side to the outer peripheral side to the intake side of the fan. Cooler of the first
The second cooler installed at the confluence part of the second ventilation passage where it branches from the ventilation passage of No. 1 and another ventilation passage merges on the way, and another ventilation passage that branches from the first ventilation passage on the way Third to join
And a third cooler arranged at the confluent portion of the ventilation passage of the.

According to a seventh aspect of the present invention, a cooling medium is provided in a ventilation passage of a cooling medium which is circulated in the machine by the rotation of an axial fan which is provided on a rotary shaft and is arranged so as to flow air toward a central portion of the shaft. A rotating electric machine equipped with a cooler for cooling
The cooler is fixed from the exhaust side of the fan installed on the rotating shaft
The first air passage is installed in a first ventilation path that goes through the air gap between the child core and the rotary shaft, and further passes through the fixed iron core from the inner peripheral side to the outer peripheral side to the intake side of the fan. Cooler of the first
A second cooler installed in a second ventilation path from the exhaust side of the fan of the ventilation path of the fan to the inner peripheral side of the stator core from the outer peripheral side. Is.

According to an eighth aspect of the present invention, a cooling medium is provided in a ventilation passage of a cooling medium which is circulated in the machine by the rotation of an axial fan which is provided on a rotary shaft and is arranged so as to flow air toward a central portion of the shaft. A rotating electric machine equipped with a cooler for cooling
The cooler is fixed from the exhaust side of the fan installed on the rotating shaft
The first air passage is installed in a first ventilation path that goes through the air gap between the child core and the rotary shaft, and further passes through the fixed iron core from the inner peripheral side to the outer peripheral side to the intake side of the fan. Cooler of the first
From the exhaust side of the air passage of the fan stator core the other short of reaching the stator core with reaching the inner periphery of the stator core via <br/> from the outer circumferential side air passage second merging with the The second cooler is installed in the confluent portion of the ventilation passage.

According to a ninth aspect of the present invention, a cooling medium is provided in a ventilation passage of a cooling medium which is circulated in the machine by the rotation of an axial fan provided on the rotary shaft so as to flow the air toward the central portion of the shaft. A rotating electric machine equipped with a cooler for cooling
The cooler is fixed from the exhaust side of the fan installed on the rotating shaft
The first air passage is installed in a first ventilation path that goes through the air gap between the child core and the rotary shaft, and further passes through the fixed iron core from the inner peripheral side to the outer peripheral side to the intake side of the fan. Cooler of the first
The second cooler and the first cooler installed in the second ventilation passage extending from the fan exhaust side of the fan passage to the inner periphery of the stator core from the outer peripheral side . The third cooler is installed at the confluent portion of the third ventilation passage from the exhaust side of the fan of the ventilation passage via the stator core.

The seventh to ninth rotary electric machines are
The ventilation passage extending from the exhaust side of the fan of the first ventilation passage to the inner peripheral side of the stator core is thermally insulated. Also, the seventh
In the rotating electrical machines according to the ninth to ninth aspects, the stator core has a plurality of ventilation ducts in the axial direction in which the cooling medium flows in the radial direction, and the ventilation area per unit length of the ventilation duct is It is different according to the direction of ventilation.

According to a tenth aspect of the present invention, there is provided a ventilation passage for a cooling medium which is circulated in the machine by rotation of an axial fan which is provided on a rotary shaft and is arranged so as to flow air toward a central portion of the shaft. To
A rotary electric machine equipped with a cooler for cooling the cooling medium, the cooler being installed from the exhaust side of a fan provided on the rotary shaft.
Via the air gap between the stator core and the rotating shaft,
A first cooler installed in a first ventilation path extending from the inner peripheral side to the outer peripheral side of the stator core to the intake side of the fan;
The second cooler is installed in the second ventilation path extending from the front side of the first cooling path of the first ventilation path to the exhaust side of the fan via the side end of the stator core. .

According to a tenth aspect of the present invention, there is provided an air passage for a cooling medium which is circulated in the machine by the rotation of an axial fan provided on the rotating shaft so as to allow air to flow toward the central portion of the shaft. To
A rotating electric machine equipped with a cooler for cooling the cooling medium, wherein the cooler forms an air gap between the stator core and the rotary shaft from the exhaust side of the first fan provided at one end of the rotary shaft.
The first cooler installed in the first ventilation path from the inner peripheral side to the outer peripheral side of the stator core to the intake side of the first fan, and to the other end side of the rotating shaft. It was installed in the second ventilation passage, which has a shorter ventilation passage length than the first ventilation passage, from the exhaust side of the provided second fan to the intake side of the second fan via the stator core from the outer peripheral side . It is composed of a second cooler.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall configuration of the turbine generator according to the first embodiment, and FIG. 2 shows a cross section taken along the line II-II of FIG. In the figure, reference numeral 1 is a stator frame, and a stator core 2 is provided on the inner peripheral portion thereof. The stator core 2 has a cylindrical shape, and a plurality of axially continuous slots are formed on the inner peripheral surface side thereof to accommodate the stator winding 3. A plurality of ventilation ducts 4 which are continuous in the radial direction are provided in the stator core 2 at substantially equal intervals in the axial direction.

A rotor iron core 6 is provided in the inner peripheral portion of the stator iron core 2 through a so-called air gap 5. 7
Is a rotary shaft, and the rotary shaft 7 is integrally formed with the rotor core 6. The end bracket 8 extends axially from the center of both end faces of the rotor core 6 and closes both ends of the stator frame 1. Is supported by a bearing device provided on the inner peripheral portion of the. A plurality of axially continuous slots are formed on the outer peripheral surface side of the rotor core 6 to accommodate the rotor winding. Both ends of the rotor winding are fixed by retaining rings 9.

Fans 10 and 11 are provided at the end of the rotary shaft 7. The fans 10 and 11 rotate together with the rotary shaft 7,
A cooling medium enclosed in the machine, such as air or hydrogen gas, is circulated in the machine. A plurality of ventilation passages for guiding the circulation of the cooling medium are formed in the machine so as to be line-symmetric with respect to the rotating shaft 7 and an axis orthogonal to the rotating shaft 7. A plurality of coolers for cooling the cooling medium are installed in the air passage and above the generator. The configuration of the ventilation passage and the arrangement of the cooler differ depending on the ventilation system of the cooling medium. In the present embodiment, the cooling medium cooled by the cooler causes the ventilation duct 4 to move to the stator core 2
Flow in both directions between the outer peripheral side of the and the air gap 5,
The so-called multi-flow ventilation system is used.

Therefore, in the machine, there is an air passage 26 extending from the inner peripheral side of the stator frame 1 to the intake side of the fan 10, an air passage 29 extending from the intake side of the fan 10 to the air gap 5, an air gap 5, and an air duct. 4, from the ventilation passage 27 between the outer peripheral side of the stator core 2 including the space facing the outer peripheral side of the side end space of the stator core 2 and the inner peripheral side of the stator frame 1 to the first ventilation passage 1
4a is formed. A main cooler 12a is installed in the ventilation passage 27 facing the outer peripheral side of the fan 10.

Further, the fan 11 is arranged from the inner peripheral side of the stator frame 1.
The air passage 30 extending to the intake side of the fan 11, the air passage 32 extending from the intake side of the fan 11 to the air gap 5, the air gap 5, the ventilation duct 4, the space facing the outer peripheral side of the side end space of the stator core 2. A first ventilation passage 14b is formed from the ventilation passage 27 between the outer peripheral side of the stator core 2 and the inner peripheral side of the stator frame 1. A main cooler 12b is installed in the ventilation passage 27 facing the outer peripheral side of the fan 11.

Between the exhaust side of the fan 10 and the air gap 5, an air passage 28 formed by a side end space of the stator core 2 on the fan 10 side, and from the air passage 28 to the outer peripheral side of the stator core 2. A second ventilation path 15a including the ventilation path 33 and the ventilation duct 4 is formed. A sub-cooler 13a is installed in the air passage 33. Between the exhaust side of the fan 11 and the air gap 5, a ventilation passage 31, a ventilation passage 31 and a stator core 2 formed by a side end space of the stator core 2 on the fan 11 side.
2nd which consists of the ventilation passage 34 and the ventilation duct 4 which reach the outer peripheral side of the
Forming a ventilation path 15b. A sub-cooler 13b is installed in the middle of the ventilation passage 34.

First ventilation passage 14a and second ventilation passage 15a
The first ventilation passage 14b and the second ventilation passage 15b are line-symmetrical with respect to the axis perpendicular to the rotating shaft 7. The main cooler 12 and the sub-cooler 13 have different cooling capacities. In the present embodiment, the cooling capacity of the sub-cooler 13 is the same as that of the main cooler 12.
It is smaller than the cooling capacity of. Therefore, the sub-cooler 1
3 is smaller than the main cooler 12. The main cooler 12a and the main cooler 12b, and the sub-cooler 13a and the sub-cooler 13b are arranged in line symmetry with respect to an axis perpendicular to the rotating shaft 7. In addition, in terms of external configuration, the main cooler 12 and the sub-cooler 13
Are arranged in a row in the axial direction on the upper part of the machine body, the main coolers 12a and 12b are located at both ends in the axial direction, and the sub-coolers 13a and 13b are the main coolers 12a and 12b.
Located in between.

A cooling water supply pipe 37a for supplying cooling water and a cooling water discharge pipe 38a for discharging cooling water are connected to the main cooler 12a and the sub-cooler 13a. A cooling water supply pipe 37b for supplying the cooling water and a cooling water discharge pipe 38b for discharging the cooling water are connected to the main cooler 12b and the sub-cooler 13b.

In the present embodiment, the cooling water supply pipe 37
a and the cooling water discharge pipe 38a are commonly connected to the main cooler 12a and the sub-cooler 13a, and the cooling water supply pipe 37b and the cooling water discharge pipe 38b are connected to the main cooler 12b and the sub-cooler 1.
Although an example is shown in which the cooling water supply pipe and the cooling water discharge pipe are commonly connected to 3b, the cooling water supply pipe and the cooling water discharge pipe may be separately connected to each cooling device, or may be connected to the main cooling devices 12a and 12b. You may connect commonly to the subcoolers 13a and 13b.
Reference numeral 39 in the drawing is a current collector for supplying electric power to the rotor winding.

Next, the flow of the cooling medium will be described.
First, the cooling medium cooled by the main cooler 12a flows toward the intake side of the fan 10 while cooling the ventilation path 26 by the rotation of the fan 10, and on the exhaust side of the fan 10, the ventilation path 28 side and the ventilation path 29. Branch to the side. The cooling medium branched to the ventilation passage 29 ventilates the fan 10 side end of the rotor core 6 in the ventilation passage 29 and the inner peripheral side of the stator core 2 and the outer peripheral side of the rotor core 6 in the air gap 5. In the duct 4, the inside of the stator core 2 is connected to the ventilation passage 27.
In the above, the space between the stator core 2 and the stator frame 1 is sequentially cooled while flowing toward the main cooler 12a.

The cooling medium branched to the ventilation passage 28 side flows toward the ventilation passage 33 while cooling the side end of the stator core 2 on the fan 10 side and the end portion of the stator winding 3 in the ventilation passage 28. The cooling medium flowing through the ventilation passage 33 is cooled by the sub-cooler 13a on the way. The cooling medium cooled by the sub-cooler 13a reaches the outer peripheral side of the stator core 2, the inside of the stator core 2 in the ventilation duct 4, and the inner peripheral side of the stator core 2 and the rotor core 6 in the air gap 5. The outer peripheral side flows while cooling, merges with the cooling medium flowing from the ventilation passage 29 side, and flows toward the main cooler 12a.

On the other hand, the cooling medium cooled by the main cooler 12b flows toward the intake side of the fan 11 while cooling the ventilation passage 30 by the rotation of the fan 11.
On the exhaust side of No. 1, it branches into the ventilation passage 31 side and the ventilation passage 32 side. The cooling medium branched to the ventilation passage 32 vents the side end of the rotor core 6 on the fan 11 side in the ventilation passage 32, and the inner peripheral side of the stator core 2 and the outer peripheral side of the rotor core 6 in the air gap 5. In the duct 4, the inside of the stator core 2 is circulated toward the main cooler 12b while sequentially cooling the space between the stator core 2 and the stator frame 1 in the ventilation passage 27.

The cooling medium branched to the ventilation passage 31 side flows toward the ventilation passage 34 while cooling the side end of the stator core 2 on the fan 11 side and the end portion of the stator winding 3 in the ventilation passage 31. The cooling medium flowing through the ventilation passage 34 is cooled by the sub-cooler 13b on the way. The cooling medium cooled by the sub-cooler 13b reaches the outer peripheral side of the stator core 2, the inside of the stator core 2 in the ventilation duct 4, and the inner peripheral side of the stator core 2 and the rotor core 6 in the air gap 5. The outer peripheral side flows while cooling, merges with the cooling medium flowing from the ventilation passage 32 side, and flows toward the main cooler 12b.

According to the first embodiment, the main cooler 1 is provided in the middle of the second ventilation passage 15 branched from the first ventilation passage 14.
Since the sub-cooler 13 different from 2 is installed, the ventilation passage 29,
The temperature rise distribution in the axial direction of the air gap 5 including 32 can be equalized.

That is, in the rotary electric machine in which the cooling medium cooled by the coolers installed at both ends of the machine is circulated by the multi-flow ventilation system, when the heat load increases as the power generation capacity increases, the air gap Since the temperature of the cooling medium rises to some extent before the cooling medium reaches the vicinity of the center, the cooling effect of the portion deteriorates, and a local heat generating portion occurs in the axial direction of the air gap.

However, in the present embodiment, the main cooler 1 is provided in the middle of the second ventilation passage 15 branched from the first ventilation passage 14.
A sub-cooler 13 different from 2 is installed, and a part of the cooling medium cooled by the main cooler 12 is further cooled by the sub-cooler 13, that is, the cooler is passed through twice to cool, and the center of the air gap. Since the cooling medium that has been sufficiently cooled is also supplied to the vicinity, it is possible to suppress the generation of a local heat generating portion, and
The temperature rise distribution in the axial direction of the air gap 5 including 9, 32 can be equalized. Therefore, the thermal vibration stroke of the rotor due to the non-uniform thermal expansion of the rotor in the axial direction can be suppressed.

Further, according to the first embodiment, a small sub-cooler 13 having a smaller cooling capacity than the main cooler 12 is installed in the middle of the second ventilation passage 15. The small sub-cooler 13 having a smaller cooling capacity than the main cooler 12 is installed because the sub-cooler 13 cools a part of the cooling medium cooled by the main cooler 12. The cooling capacity may be small so as to match the capacity of the cooling medium flowing through the second ventilation passage 15, and the cooling efficiency is better in this case. Further, it is because there is an advantage that the cooling capacity of the main cooler 12 itself can be reduced by sharing the cooling. Further, the sub-cooler 13 is arranged in a space smaller than the space in which the main cooler is arranged, and therefore can be arranged only in a small size.

FIG. 3 is a drawing showing the structure of the turbine generator of the second embodiment, showing a modification of the first embodiment. In the present embodiment, the ventilation passage 33, which is a part of the second ventilation passage 15a, and the ventilation passage 34, which is a part of the second ventilation passage 15b, are joined together on the way, and at the joining portion. Has a sub-cooler 13. In terms of appearance, the main cooler 12 and the sub-cooler 13 are arranged in a line in the axial direction of the upper part of the machine body, and the main coolers 12a and 12b are arranged.
Are located at both ends in the axial direction, and the sub-cooler 13 is the main cooler 12
It is located between a and 12b.

According to the ventilation structure of the present embodiment having such a configuration, the cooling medium branched to the ventilation passage 28 side on the exhaust side of the fan 10 and the cooling branched to the ventilation passage 32 side on the exhaust side of the fan 11. The mediums merge before the outer peripheral side of the stator core 2 and are cooled by the sub-cooler 13. The cooled cooling medium reaches the air gap 5 from the outer peripheral side of the stator core 2 through the ventilation duct 4, branches to the ventilation passage 29 side and the ventilation passage 32 side, and the cooling medium branched to the ventilation passage 29 side is , And merges with the cooling medium flowing from the ventilation passage 29.
The cooling medium branched to the ventilation passage 32 side merges with the cooling medium flowing from the ventilation passage 32.

According to the second embodiment, the main cooler 1 is provided in the middle of the second ventilation passage 15 branched from the first ventilation passage 14.
A sub-cooler 13 different from 2 is installed, and a part of the cooling medium cooled by the main cooler 12 is further cooled by the sub-cooler 13, that is, the cooler is passed through twice to cool, and the center of the air gap. Since the cooling medium that has been sufficiently cooled is also supplied to the vicinity, it is possible to suppress the generation of a local heat generating portion, and
The temperature rise distribution in the axial direction of the air gap 5 including 9, 32 can be equalized. Therefore, as in the previous example, the thermal vibration stroke of the rotor due to the non-uniform thermal expansion of the rotor in the axial direction can be suppressed.

FIG. 4 is a drawing showing the structure of the turbine generator according to the third embodiment, that is, the first embodiment and the second embodiment.
The example of the combination which combined with the embodiment of is shown. In the present embodiment, the second ventilation passage 15 and the third ventilation passage 16 are branched from the exhaust side of the fan of the first ventilation passage 14.

More specifically, the fan 1 of the stator core 2 is provided between the exhaust side of the fan 10 and the air gap 5.
Ventilation path 28 consisting of a side end space on the 0 side, ventilation path 33 extending from ventilation path 28 to the outer peripheral side of stator core 2, ventilation duct 4
To form a second ventilation path 15a. Ventilation path 3
A sub-cooler 13a is installed in the middle of 3.

Between the exhaust side of the fan 11 and the air gap 5, the ventilation passage 31, which is formed by the side end space on the fan 11 side of the stator core 2, the ventilation passage 31 and the outer peripheral side of the stator core 2. Second ventilation passage 1 including ventilation passage 34 and ventilation duct 4
5b is formed. The sub-cooler 1 is provided in the middle of the ventilation passage 34.
3b is installed.

Further, between the exhaust side of the fan 10 and the air gap 5, an air passage 28 formed by a side end space of the stator core 2 on the fan 10 side, and from the air passage 28 to the outer peripheral side of the stator core 2. To form a third ventilation path 16a composed of the ventilation path 35 and the ventilation duct 4 extending between the exhaust side of the fan 11 and the air gap 5 from the side end space of the stator core 2 on the fan 11 side. Ventilation path 31, ventilation path 31 and stator core 2
3rd which consists of ventilation passage 36 and ventilation duct 4 which reach the outer peripheral side of
Forming a ventilation path 15b.

The ventilation passage 35 and the ventilation passage 36 join together on the way. A sub-cooler 13c is installed at the confluent portion. In terms of appearance, the main cooler 12 and the sub-cooler 13 are arranged in a line in the axial direction of the upper part of the machine body.
The main coolers 12a and 12b are located at both ends in the axial direction, and the sub-coolers 13a, 13b and 13c are located between the main coolers 12a and 12b.

According to the ventilation structure of the present embodiment configured as described above, the cooling medium branched to the ventilation passage 28 side on the exhaust side of the fan 10 is located in the ventilation passage 28 on the fan 10 side of the stator core 2. The end and the end portion of the stator winding 3 are circulated while cooling and branched on the outer peripheral side. One of the branched cooling media flows through the ventilation passage 33 and is cooled by the sub-cooler 13a on the way. The cooling medium cooled by the sub-cooler 13a reaches the outer peripheral side of the stator core 2,
The inside of the stator core 2 is cooled in the ventilation duct 4 and reaches the air gap 5.

The other branched cooling medium flows through the ventilation passage 35, joins the cooling medium flowing from the ventilation passage 36, which will be described later, and is cooled by the subcooler 13c.
The cooling medium cooled by the sub-cooler 13c cools the inside of the stator core 2 in the ventilation duct 4 and reaches the air gap 5.

On the other hand, the cooling medium branched to the ventilation passage 31 side on the exhaust side of the fan 11 has the stator core 2 in the ventilation passage 31.
The side end on the fan 11 side and the end part of the stator winding 3 flow while cooling, and branch on the outer peripheral side. One of the branched cooling media flows through the ventilation passage 34 and is cooled by the sub-cooler 13b on the way. The cooling medium cooled by the sub-cooler 13b reaches the outer peripheral side of the stator core 2, cools the inside of the stator core 2 in the ventilation duct 4, and reaches the air gap 5.

The other branched cooling medium flows through the ventilation passage 36, joins the cooling medium flowing through the ventilation passage 35 described above, and is cooled by the sub-cooler 13c.
The cooling medium cooled by the sub-cooler 13c cools the inside of the stator core 2 in the ventilation duct 4 and reaches the air gap 5.

Further, the cooling medium reaching the air gap 5 through the ventilation passage 33 and the ventilation duct 4 branches in the air gap 5, one of which joins the cooling medium flowing through the ventilation passage 29, and the other of which is the sub-cooling. It is cooled by the vessel 13c and merges with the cooling medium that has reached the air gap 5 via the ventilation duct 4. The cooling medium that has reached the air gap 5 through the ventilation passage 34 and the ventilation duct 4 branches in the air gap 5, one of which joins the cooling medium flowing through the ventilation passage 32, and the other of which is cooled by the sub-cooler 13c. It merges with the cooling medium reaching the air gap 5 through the ventilation duct 4.

A cooling medium in which the cooling medium reaching the air gap 5 via the ventilation passage 33 and the ventilation duct 4 and the cooling medium cooled by the sub-cooler 13c and reaching the air gap 5 via the ventilation duct 4 join together. , The cooling medium that has reached the air gap 5 via the ventilation passage 34 and the ventilation duct 4 and the cooling medium that has been cooled by the sub-cooler 13c and has reached the air gap 5 via the ventilation duct 4 are the cooling medium. 4 to the ventilation path 27.

According to the third embodiment, the main cooler 1 is provided in the middle of the second ventilation passage 15 branched from the first ventilation passage 14.
A sub-cooler 13 different from the main cooler 12 is installed in the middle of the third ventilation path 16 branched from the first ventilation path 14. A part of the cooling medium cooled in 12 is further cooled in the sub-cooler 13, that is, the cooling medium is passed through the cooler twice to supply the sufficiently cooled cooling medium to the vicinity of the center of the air gap. Therefore, it is possible to suppress the generation of a local heat generating portion,
The temperature rise distribution in the axial direction of the air gap 5 including 32 can be equalized. Therefore, as in the previous example, the thermal vibration stroke of the rotor due to the non-uniform thermal expansion of the rotor in the axial direction can be suppressed.

FIG. 5 is a drawing showing the structure of the turbine generator according to the fourth embodiment and shows a modification of the first embodiment. In the present embodiment, one of the cooling media cooled by the sub-cooler 13a and branched to the air gap 5 via the ventilation duct 4 and one of the cooling media cooled by the sub-cooler 13b to the air gap 5 via the ventilation duct 4 are branched. The third ventilation passage 16 is formed so as to merge with one of the cooling media and reach the ventilation passage 27 through the ventilation duct 4. The external structure is similar to that of the first embodiment.

According to the fourth embodiment, the main cooler 1 is provided in the middle of the second ventilation passage 15 branched from the first ventilation passage 14.
A sub-cooler 13 different from 2 is installed, and a part of the cooling medium cooled by the main cooler 12 is further cooled by the sub-cooler 13, that is, the cooler is passed through twice to cool, and the center of the air gap. Since the cooling medium that has been sufficiently cooled is also supplied to the vicinity, it is possible to suppress the generation of a local heat generating portion, and
The temperature rise distribution in the axial direction of the air gap 5 including 9, 32 can be equalized. Therefore, as in the previous example, the thermal vibration stroke of the rotor due to the non-uniform thermal expansion of the rotor in the axial direction can be suppressed.

FIG. 6 is a drawing showing a cross section of a turbine generator according to the fifth embodiment, and shows a modification of the fourth embodiment. In the present embodiment, the arrangement location and the number of the main coolers 12 are changed, and the main cooler 12a is provided in the ventilation passage portion from the ventilation duct 4 of the first ventilation passage 14a to the ventilation passage 27.
Is installed, and the main cooler 12b is installed in the ventilation passage portion extending from the ventilation duct 4 of the first ventilation passage 14b to the ventilation passage 27. In addition, from the ventilation duct 4 of the third ventilation passage to the ventilation passage 27
The main cooler 12c is newly installed in the ventilation path portion leading to. Incidentally, as in the fourth embodiment, the sub-cooler 13a is installed in the ventilation passage 33, and the sub-cooler 13b is installed in the ventilation passage 34. In terms of appearance, the main cooler 12 and the sub-cooler 13 are arranged so as to form one row in the axial direction on the upper part of the machine body, and the main coolers 12a, 12b, 12c are dispersed in the axial direction, and the sub-cooler 13a Is located between the main coolers 12a and 12c, and the sub-cooler 13b is located between the main coolers 12b and 12c.

According to the fifth embodiment, the main cooler 1 is provided in the middle of the second ventilation passage 15 branched from the first ventilation passage 14.
A sub-cooler 13 different from 2 is installed, and a part of the cooling medium cooled by the main cooler 12 is further cooled by the sub-cooler 13, that is, the cooler is passed through twice to cool, and the center of the air gap. Since the cooling medium that has been sufficiently cooled is also supplied to the vicinity, it is possible to suppress the generation of a local heat generating portion, and
The temperature rise distribution in the axial direction of the air gap 5 including 9, 32 can be equalized. Therefore, as in the previous example, the thermal vibration stroke of the rotor due to the non-uniform thermal expansion of the rotor in the axial direction can be suppressed.

FIG. 7 is a drawing showing the structure of the turbine generator according to the sixth embodiment and shows a modification of the second embodiment. In this embodiment, the ventilation passage 33 and the ventilation passage 34 are provided with thermal insulation 37. The heat insulation 37 is a heat insulating material such as glass wool, and is provided by being wound around the inner wall or the outer wall of the ventilation passage.

As described above, the heat insulation 37 is provided because the ventilation passages 33 and 34 are a cooling medium flowing through the ventilation duct 4 from the air gap 5 toward the outer peripheral side of the stator core 2.
That is, since it is provided in the ventilation passage of the high-temperature cooling medium that has finished cooling the stator core 2, the ventilation passage 33 and the ventilation passage 3 are provided.
The cooling medium flowing through 4 is heat-exchanged with the cooling medium flowing through the ventilation duct 4 from the air gap 5 toward the outer peripheral side of the stator core 2. When heat is exchanged, the sub-cooler 1 installed at the confluence of the ventilation passage 33 and the ventilation passage 34.
Therefore, the cooling effect due to 3 decreases, and the cooling effect near the center of the air gap 5 also decreases.

Therefore, in the present embodiment, thermal insulation 37 is provided on the inner wall or outer wall of the ventilation passage 33 and the ventilation passage 34, and the ventilation duct 4 extends from the air gap 5 toward the outer peripheral side of the stator core 2. The heat exchange with the circulating cooling medium is suppressed, and the effect of the second embodiment can be further enhanced.

Further, in the present embodiment, the axial intervals of the ventilation ducts 4 are made different depending on the flowing direction of the cooling medium. That is, in order to equalize the temperature rise distribution, it is important to effectively circulate the cooling medium in the local heat generating portion. In view of this, in the present embodiment, the axial gap of the ventilation ducts 4 through which the cooling medium flows from the air gap 5 toward the outer peripheral side of the stator core 2 is increased to provide an equivalent ventilation area per unit length. By making it small, the air volume of the cooling medium flowing on the outer peripheral side of the stator core 2 is suppressed.

Further, it is necessary to reduce the axial interval of the ventilation ducts 4 through which the cooling medium flows from the outer peripheral side of the stator core 2 toward the air gap 5 and increase the equivalent ventilation area per unit length. Thus, the air volume of the cooling medium flowing near the center of the air gap 5 is increased.

According to the present embodiment as described above, a large amount of cooling medium can be supplied to the vicinity of the center of the air gap 5 to cool it, so that the effect of the second embodiment can be further enhanced.

The structure of this embodiment is not limited to that of the second embodiment and may be adopted in other embodiments.

FIG. 8 shows the structure of the turbine generator according to the seventh embodiment. This embodiment employs a so-called single reverse flow ventilation method in which the cooling medium cooled by the cooler flows in the ventilation duct 4 in one direction from the outer peripheral side of the stator core 2 toward the air gap 5.

For this reason, in the machine, a ventilation path 17 extending from the exhaust side of the fan 10 to the inner peripheral side of the stator frame 1 and the stator core 2 are provided.
Between the outer peripheral side of the fan and the inner peripheral side of the stator frame 1, the air duct 5, the air gap 5, the air gap 5, the air passage 20 extending from the air gap 5 to the intake side of the fan 10, the first air passage 14
a is formed. A main cooler 12a is installed in the ventilation passage 25 facing the outer peripheral end of the stator core 2 on the fan 10 side.

Further, from the exhaust side of the fan 11, the stator frame 1
Ventilation path 21 extending to the inner circumference side of V, ventilation path 25 between the outer circumference side of stator core 2 and the inner circumference side of stator frame 1, ventilation duct 4,
The first air passage 14b is formed from the air passage 24 extending from the air gap 5, the air gap 5 to the intake side of the fan 11. A main cooler 12b is installed in the ventilation passage 25 facing the outer peripheral side end of the stator core 2 on the fan 11 side.

Between the main cooler 12a front side of the ventilation passage 17 and the ventilation passage 20, the ventilation passage 19 formed by the side end space of the stator core 2 on the fan 10 side, that is, the second ventilation passage 15 is formed.
a is formed. A sub-cooler 13a is installed on the outer peripheral side of the second ventilation passage 15a (the side branching from the ventilation passage 17). Between the front side of the main cooler 12b of the ventilation passage 21 and the ventilation passage 24, a ventilation passage 23 formed of a side end space of the stator core 2 on the fan 11 side, that is, a second ventilation passage 15a is formed. There is. A sub-cooler 13a is installed on the outer peripheral side of the second ventilation passage 15a (the side branching from the ventilation passage 21).

The first ventilation passage 14a and the first ventilation passage 14
b, the second ventilation passage 15a and the second ventilation passage 15b are line-symmetrical with respect to an axis perpendicular to the rotating shaft 7. The main cooler 12 and the sub-cooler 13 have different cooling capacities,
In the present embodiment, the cooling capacity of the sub-cooler 13 is set to the main cooler 1
It is smaller than the cooling capacity of 2. Therefore, the sub-cooler 13 is smaller than the main cooler 12. Main cooler 12a
And main cooler 12b and sub-cooler 13a and sub-cooler 13b
Are arranged in line symmetry with respect to an axis perpendicular to the rotation axis 7. In addition, in terms of external configuration, the main cooler 12 and the sub-cooler 13
Are arranged in a row in the axial direction on the upper part of the machine body, the sub-coolers 13a and 13b are located at both ends in the axial direction, and the main coolers 12a and 12b are the sub-coolers 13a and 13b.
Located in between. Since the other configurations are similar to those of the previous example, description thereof will be omitted.

Next, the flow of the cooling medium will be described.
First, the cooling medium cooled by the main cooler 12a circulates toward the intake side of the fan 10 due to the rotation of the fan 10, and in the ventilation passage 25, between the stator core 2 and the stator frame 1, the ventilation duct 4 At the inside of the stator core 2,
The inner circumferential side of the stator core 2 and the outer circumferential side of the rotor core 6 are sequentially cooled in the air gap 5, and the side end of the rotor core 6 on the fan 10 side in the ventilation passage 20 is sequentially cooled.

The cooling medium cooled by the sub-cooler 13a flows through the ventilation passage 19 toward the intake side of the fan 10, and the side end of the stator core 2 on the fan 10 side and the stator winding 3 are provided.
Cool the end of the. The cooling media that have been cooled and circulated by both coolers join together on the intake side of the fan 10, flow toward the main cooler 12a from the exhaust side of the fan 10 while cooling the ventilation passage 17, and in front of the main cooler 12a. Cooling medium flowing to the main cooler 12a side and sub-cooler 13a
The cooling medium is distributed to the side and distributed.

On the other hand, the cooling medium cooled by the main cooler 12b circulates toward the intake side of the fan 11 due to the rotation of the fan 11, and in the ventilation passage 25, between the stator core 2 and the stator frame 1. In the ventilation duct 4, the inside of the stator core 2 is arranged, in the air gap 5, the inner peripheral side of the stator core 2 and the outer peripheral side of the rotor core 6 are arranged, and in the ventilation passage 24, the side end of the rotor core 6 on the fan 11 side is arranged. Cool each one in turn.

The cooling medium cooled by the sub-cooler 13b circulates in the ventilation passage 23 toward the intake side of the fan 11, and the side end of the stator core 2 on the fan 11 side and the stator winding 3 are connected.
Cool the end of the. The cooling media that have been cooled and circulated by both coolers merge on the intake side of the fan 11, flow toward the main cooler 12b while cooling the ventilation passage 21 from the exhaust side of the fan 11, and in front of the main cooler 12b. Cooling medium flowing to the main cooler 12b side and sub-cooler 13b
The cooling medium is distributed to the side and distributed.

According to the seventh embodiment, the second ventilation passage 15 that branches off from the main cooler 12 in front of the first ventilation passage 14 is provided.
Since the sub-cooler 13 different from the main cooler 12 is installed on the branch side, the temperature rise distribution in the axial direction of the air gap 5 including the ventilation passages 20 and 24 can be equalized.

That is, in the rotating electric machine in which the cooling medium cooled by the coolers installed at the both ends of the machine is circulated by the single reverse flow ventilation system, when the heat load increases as the power generation capacity increases, Since the temperature of the cooling medium rises before the cooling medium reaches the vicinity of the intake side, the cooling effect of that portion deteriorates, and a local heat generating portion occurs in the axial direction of the air gap.

However, in the present embodiment, the second ventilation passage 15 branched from the front side of the main cooler 12 of the first ventilation passage 14 is branched.
Is formed, and a sub-cooler 13 different from the main cooler 12 is installed on the branch side thereof, so that the sufficiently cooled cooling medium is supplied also to the vicinity of the intake sides of the fans 10 and 11. It is possible to suppress the generation of a typical heat generation portion, and it is possible to equalize the temperature rise distribution in the axial direction of the air gap 5 including the ventilation passages 20 and 24. Therefore, the thermal vibration stroke of the rotor due to the non-uniform thermal expansion of the rotor in the axial direction can be suppressed.

Further, according to the seventh embodiment, a small sub-cooler 13 having a smaller cooling capacity than the main cooler 12 is installed in the middle of the second ventilation passage 15. The subcooler 13 having a smaller cooling capacity than that of the main cooler 12 is installed in this way because the subcooler 13 cools a part of the cooling medium cooled by the main cooler 12. The cooling capacity may be small so as to match the capacity of the cooling medium flowing through the second ventilation passage 15, and the cooling efficiency is better in this case. Further, it is because there is an advantage that the cooling capacity of the main cooler 12 itself can be reduced by sharing the cooling. Further, the sub-cooler 13 is arranged in a space smaller than the space in which the main cooler is arranged, and therefore can be arranged only in a small size.

FIG. 9 shows the structure of the turbine generator of the eighth embodiment. Similar to the seventh embodiment, the present embodiment is a so-called single, in which the cooling medium cooled by the cooler flows in one direction from the outer peripheral side of the stator core 2 toward the air gap 5 in the ventilation duct 4. The reverse flow ventilation system is adopted.

For this reason, in the machine, a ventilation path 17 extending from the exhaust side of the fan 10 to the inner peripheral side of the stator frame 1 and the stator core 2 are provided.
Ventilation path 18, ventilation duct 4, between the outer peripheral side of the stator core 2 including the outer peripheral side of the side end space and the inner peripheral side of the stator frame 1.
From the air passage 5 formed by the side end space of the stator core 2 on the fan 10 side, the air gap 5, the air gap 5 to the fan 1
The first ventilation passage 14 is formed from the ventilation passage 20 extending to the intake side of 0. Ventilation path 18 facing the outer peripheral side of the fan 10.
The main cooler 12 is installed in the part.

Further, from the exhaust side of the fan 11, the stator frame 1
Passage 21 extending to the inner peripheral side of the stator core, the ventilation passage 22 between the outer peripheral side of the stator core 2 including the outer peripheral side of the side end space of the stator core 2 and the inner peripheral side of the stator frame 1, and a ventilation duct 4, Stator core 2
The second ventilation passage 15 is formed from the ventilation passage 23 formed of the side end space on the fan 11 side, the air passage 5 extending from the air gap 5, the air gap 5 to the intake side of the fan 11.
A sub-cooler 13 is installed in a portion of the ventilation passage 22 facing the outer peripheral side of the fan 11.

The first ventilation passage 14 and the second ventilation passage 15 have different ventilation passage lengths. In the present embodiment, the ventilation passage length of the second ventilation passage 15 is the same as that of the first ventilation passage 14. It is shorter than the road length. Further, the main cooler 12 and the sub-cooler 13 have different cooling capacities, and in the present embodiment, the sub-cooler 1
The cooling capacity of No. 3 is smaller than that of the main cooler 12. Therefore, the sub-cooler 13 is smaller than the main cooler 12. Further, the main cooler 12 and the sub-cooler 13 are arranged in line symmetry with respect to an axis perpendicular to the rotating shaft 7. In terms of appearance, the main cooler 12 and the sub-cooler 13 are arranged so as to form one row in the axial direction at the upper part of the machine body, and the main cooler is located at one axial end and the sub-cooler is located. 13 is located at the other end in the axial direction. Since the other configurations are similar to those of the previous example, description thereof will be omitted.

Next, the flow of the cooling medium will be described.
First, the cooling medium cooled by the main cooler 12 is divided into the air passage 18 and the air passage 19 and flows by the rotation of the fan 10. The cooling medium flowing in the ventilation passage 18 is between the stator core 2 and the stator frame 1 in the ventilation passage 18, the inside of the stator core 2 in the ventilation duct 4, and the inner circumference of the stator core 2 in the air gap 5. Side and the outer peripheral side of the rotor core 6,
In the ventilation passage 20, the side ends of the rotor core 6 on the fan 10 side are sequentially cooled, and flow toward the intake side of the fan 10.

The cooling medium flowing in the ventilation passage 19 flows toward the intake side of the fan 10 while cooling the side end of the stator core 2 on the fan 10 side and the end portion of the stator winding 3.
Both cooling media merge on the intake side of the fan 10. The combined cooling medium flows from the exhaust side of the fan 10 toward the main cooler 12 while cooling the ventilation passage 17, and again the main cooler 12
Cooled by.

On the other hand, the cooling medium cooled by the sub-cooler 13 is rotated by the fan 11 so that the ventilation passage 22 and the ventilation passage 2 are cooled.
Divided into 3 and distributed. The cooling medium flowing in the ventilation passage 22 is between the stator core 2 and the stator frame 1 in the ventilation passage 22, the inside of the stator core 2 in the ventilation duct 4, and the inner circumference of the stator core 2 in the air gap 5. Side and the outer peripheral side of the rotor core 6 while sequentially cooling the side ends of the rotor core 6 on the fan 11 side in the ventilation passage 24, respectively.
Flow toward the intake side of.

The cooling medium flowing through the ventilation passage 23 flows toward the intake side of the fan 11 while cooling the side end of the stator core 2 on the fan 11 side and the end of the stator winding 3.
Both cooling media merge on the intake side of the fan 11. The combined cooling medium flows from the exhaust side of the fan 11 toward the sub-cooler 13 while cooling the ventilation passage 21, and again the sub-cooler 13
Cooled by.

According to the eighth embodiment, the second ventilation passage 15 having a shorter ventilation passage length than the first ventilation passage 14 is formed.
Since the sub-cooler 13 different from the main cooler 12 is installed on the way, the temperature rise distribution in the axial direction of the air gap 5 including the ventilation passages 20 and 24 can be leveled.

That is, in a rotary electric machine in which a cooling medium cooled by a cooler installed at one end of the machine is circulated by a single reverse flow ventilation method, when the heat load increases with the increase in power generation capacity, the cooling is performed. Since the temperature of the cooling medium rises before the cooling medium reaches the vicinity of the fan at the part away from the device (the other end of the machine), the cooling effect of that part deteriorates and the axial direction of the air gap is reduced. A local heat generation part will occur.

However, in the present embodiment, the second ventilation passage 15 having a shorter ventilation passage length than the first ventilation passage 14 is formed,
A sub-cooler 13 different from the main cooler 12 is installed there, and a sufficiently cooled cooling medium is supplied also to the vicinity of the fan in the part away from the main cooler 11, so that local heat generation is achieved. Generation of a portion can be suppressed, and the temperature rise distribution in the axial direction of the air gap 5 including the ventilation paths 20 and 24 can be leveled. Therefore, the thermal vibration stroke of the rotor due to the non-uniform thermal expansion of the rotor in the axial direction can be suppressed.

Further, according to the eighth embodiment, a small sub-cooler 13 having a smaller cooling capacity than the main cooler 12 is installed in the middle of the second ventilation passage 15. The small sub-cooler 13 having a smaller cooling capacity than the main cooler 12 is installed because the sub-cooler 13 has a ventilation length longer than that of the first ventilation path 14 in which the main cooler 12 is installed. This is for cooling the cooling medium flowing through the short second ventilation passage, and the cooling capacity may be small so as to correspond to the capacity of the cooling medium flowing through the second ventilation passage 15, and the cooling efficiency is better. Because.

[0089]

The rotating electric machine according to the present invention is provided with a main cooler and a sub cooler, and at least a part of the cooling medium cooled by the main cooler is further the sub cooler. Since it is configured to be cooled by the above, the temperature rise distribution inside the machine is leveled, and uneven thermal expansion in the axial direction of the rotor does not occur, and the thermal vibration stroke of the rotor does not increase.

[Brief description of drawings]

FIG. 1 is an external view showing an external configuration of a turbine generator that is a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a sectional view showing an internal configuration of a turbine generator that is a second embodiment of the present invention, showing an improved example of FIG.

FIG. 4 is a cross-sectional view showing an internal configuration of a turbine generator that is a third embodiment of the present invention, showing a combination example of FIGS. 2 and 3.

FIG. 5 is a cross-sectional view showing the internal configuration of a turbine generator that is a fourth embodiment of the present invention, showing an improved example of FIG.

FIG. 6 is a cross-sectional view showing an internal configuration of a turbine generator that is a fifth embodiment of the present invention, showing an improved example of FIG.

FIG. 7 is a cross-sectional view showing an internal configuration of a turbine generator that is a sixth embodiment of the present invention, showing an improved example of FIG.

FIG. 8 is a sectional view showing an internal configuration of a turbine generator that is a seventh embodiment of the present invention.

FIG. 9 is a sectional view showing an internal configuration of a turbine generator that is an eighth embodiment of the present invention.

[Explanation of symbols]

1 ... Stator frame, 2 ... Stator core, 3 ... Stator winding, 4 ...
Ventilation duct, 5 ... Air gap, 6 ... Rotor core, 7 ...
Rotation axis, 8 ... End bracket, 9 ... Retaining ring,
10, 11 ... Cooling fan, 12 ... Main cooler, 13 ... Sub-cooler, 14 ... First ventilation passage, 15 ... Second ventilation passage, 16
... third ventilation passage, 17, 18, 19, 20, 21, 21
2,23,24,25,26,27,28,29,3
0, 31, 32, 33, 34, 35, 36 ... Ventilation path, 3
7 ... Cooling water supply pipe, 38 ... Cooling water discharge pipe, 39 ... Current collector.

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuomi Yagi 3-1-1, Saiwaicho, Hitachi City, Ibaraki Hitachi Ltd. Hitachi factory inside (72) Inventor Junji Sato 3-chome, Saiwaicho, Hitachi City, Ibaraki No. 1 Hitachi Ltd. in the Hitachi factory (72) Inventor Shinsaku Shirata 3-1-1, Saiwaicho, Hitachi-shi, Ibaraki Hitachi Ltd. (72) Inventor Hideaki Mori 502 Kamimachi, Tsuchiura-shi, Ibaraki Prefecture Address, Hitachi, Ltd., Mechanical Research Laboratory (72) Inventor, Eiji Tsuji, 1-1, Sachimachi, Hitachi City, Ibaraki Prefecture Hitachi, Ltd., Hitachi, Ltd., (72) Inventor, Kenichi Hattori, 3-chome, Hitachi City, Hitachi, Ibaraki Prefecture No. 1 Hitachi, Ltd. Hitachi factory (72) Inventor Atsushi Ishihara 3-1-1, Saiwaicho, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi, Ltd. (56) References JP 10-146022 (JP, A) JP 7-177705 (JP, A) JP 8-331781 (JP, A) JP 60-162432 (JP, A) JP 52-1402 (JP, A) JP 52-1403 (JP, A) JP 58-121166 (JP, U) JP 57-42560 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 9/00-9/28

Claims (3)

(57) [Claims] 1. A rotary shaft is provided so that air flows toward the center of the shaft.
In a rotary electric machine provided with a cooler for cooling the cooling medium in a ventilation passage of a cooling medium circulating in the machine by the rotation of an axial fan installed as described above, the cooling device is an exhaust side of a fan provided on the rotating shaft. From the air between the stator core and the rotating shaft
Go through the gap and then move the stator core from the inner circumference to the outer circumference.
A first cooler installed in a first ventilation passage extending to the intake side of the fan via the side, and the stator core from the outer peripheral side from the exhaust side of the fan in the first ventilation passage. The second air passage installed in the second ventilation passage extending to the inner circumference side of the stator core.
A rotating electric machine, comprising: 2. A rotary shaft is provided so that air flows toward the center of the shaft.
In a rotary electric machine provided with a cooler for cooling the cooling medium in a ventilation passage of a cooling medium circulating in the machine by the rotation of an axial fan installed as described above, the cooling device is an exhaust side of a fan provided on the rotating shaft. From the air between the stator core and the rotating shaft
Go through the gap and then move the stator core from the inner circumference to the outer circumference.
A first cooler installed in a first ventilation passage extending to the intake side of the fan via the side, and the stator core from the outer peripheral side from the exhaust side of the fan in the first ventilation passage. And is installed at the confluence portion of the second ventilation passage that joins with other ventilation passages before reaching the stator iron core from the outer peripheral side to the inner peripheral side of the stator iron core. The second done
A rotating electric machine, comprising: 3. A rotary shaft is provided so that air flows toward the center of the shaft.
The ventilation path of the cooling medium flowing through the machine by the rotation of the axial fan and sea urchin installed in the rotary electric machine with a cooling device for cooling the cooling medium body, the cooler exhaust fan provided on the rotary shaft From the side between the stator core and the rotating shaft
Go through the gap and then move the stator core from the inner circumference to the outer circumference.
A first cooler installed in a first ventilation path extending to the intake side of the fan from the outer side of the fan from the exhaust side of the fan in the first ventilation path And a second cooler installed in a second ventilation path extending to the inner peripheral side of the stator core, and the stator core from the outer peripheral side from the exhaust side of the fan of the first ventilation path. A rotating electric machine comprising: a third cooler installed at a confluence portion of a third ventilation passage that joins another ventilation passage before reaching the inner peripheral side of the stator core.