JPH07245914A - Cooling air ventilation device for rotating electric machine - Google Patents

Abstract

(57) [Abstract] [Purpose] Wind pressure of the cooling air sent from the axial fan attached to the rotor to cool the rotor magnetic poles of the rotating electric machine, the stator core of the stator, and the stator coil. Higher,
Increase the application range of the self-ventilation method. [Structure] Axial fans 14 and 31 are provided on the outer peripheral surfaces of cylindrical fan bosses 15 and 30 attached to both end surfaces of a yoke 5 of a rotor center 6 of a rotor 1, respectively.
After cooling the cooling air which is boosted from the air and sent by the air cooler 20, the cooling air is sucked into the axial fan 31 through the ventilation holes 3 of the rotor 1 to boost the pressure, and the axial fans 14, 31 arranged in series.
Thus, the magnetic pressure, the stator core 11 and the stator coil 12 are cooled by increasing the air pressure higher than that of the conventional axial fan 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine for cooling a stator and a rotor of a rotating electric machine such as a generator or an electric motor by a cooling air blown by an axial fan attached to the rotor. A ventilation device.

[0002]

2. Description of the Related Art During operation of a rotating electric machine such as a generator or an electric motor,
Since heat is generated in the coils and iron cores of the stator and rotor, a fan and an air cooler are conventionally provided in the rotating electric machine, and the air sent by the fan is circulated in the machine and cooled by the air cooler. The wind cools the coils and iron cores of the stator and rotor to prevent the insulation resistance from decreasing.

As a rotary electric machine equipped with a cooling fan of this kind, one shown in FIG. 12 is known. In FIG. 12, a rotor 1 includes a shaft 2, a rotor center 6 including a ring 4 having a ventilation hole 3 attached to the shaft 2 and a yoke 5.
And a magnetic pole 7 attached to the outer peripheral surface of the yoke 5 of the rotor center 6. The stator 8 includes a stator frame 9 surrounding the rotor 1, a stator core 11 having a ventilation hole 10 attached to the inner peripheral surface of the stator frame 9, and a stator coil 12
It consists of and.

A casing 13 surrounds the rotor 1 together with a part of the stator frame 9, and a shaft 2 penetrates through the casing 13. Axial fan 1
4 is provided on a cylindrical fan boss 15 surrounding the shaft 2 attached to the end surface of the yoke 5 of the rotor center 6.
In addition, 16 and 17 are fan guides, 18 is a partition plate, and 20
Is an air cooler.

With this structure, when the rotor 1 rotates, the air blown by the axial fan 14 flows through the air cooler 20 to be cooled, and this cooling air passes through the ventilation holes 3 of the rotor center 6. After passing through, it flows between the ventilation holes 10 provided in the stator core 11 of the stator 8 and the magnetic poles 7, is sucked by the axial fan 14 and circulates in the machine. By the circulation of this cooling air,
During operation of the rotating electric machine, heat generated in the magnetic pole 7 of the rotor 1 and the stator core 11 and the stator coil 12 of the stator 8 is removed and cooled to prevent a decrease in insulation resistance.

FIG. 13 is a partial sectional view of a rotary electric machine provided with a cooling air ventilation device different from that shown in FIG. In FIG.
The electric blower 22 is installed separately from the rotor 1, and the fan guide 2
3, it is the same as FIG. 12 except that the mounting plate 24 and the partition plate 25 are provided. Such a configuration is adopted when the rotation speed of the rotor 1 is low, or when the axial flow fan has a small diameter and the wind pressure required to circulate the cooling air cannot be secured, and the electric blower 22 installed separately is used. By driving, cooling air having a required wind pressure is circulated in the machine, and the magnetic pole 7, the stator core 11 and the stator coil 12 are cooled in the same manner as described above.

[0007]

[Problems to be Solved by the Invention] As shown in FIG.
The self-ventilation type cooling method by the axial fan 14 attached to the rotor 1 is based on structural restrictions such as the rotation speed of the rotor and the diameter of the axial fan, and the required wind pressure due to the size of the ventilation resistance inside the machine. There is a problem in that there may be cases where it cannot be secured.

In order to solve such a problem, FIG.
As shown in (1), there is no choice but to install a separate electric blower and adopt a forced ventilation system so as to have a required wind pressure.
However, such a forced ventilation system naturally has a problem in that the number of auxiliary machines is increased, so that daily maintenance and inspection are increased and the cost is also increased.

Further, it was studied to reduce the ventilation resistance of the air duct for the cooling air circulating in the machine. Also,
Since the axial flow fan 14 is on the side where the cooling air cools the magnetic poles, the stator core and the stator coil and flows out, the cooling air sent from between the magnetic poles is agitated by the rotation of the rotor having the magnetic poles and swirled. Since a flow or vortex is generated and flows into the axial fan 14, there is a problem that ideal fan characteristics cannot be obtained.

Further, if the stator core has no ventilation holes for cooling air, there is a problem that the end portions of the stator coil are not sufficiently cooled. An object of the present invention is to provide a maintenance-free high wind pressure of cooling air, have a duct with low ventilation resistance, improve fan characteristics, and further, if the stator core has no ventilation holes for cooling air, the stator It is an object of the present invention to provide a cooling air ventilation device for a rotating electric machine of a self-ventilation type that can sufficiently cool the end portion of a coil.

[0011]

In order to solve the above-mentioned problems, according to the present invention, a magnetic pole provided on an outer peripheral surface of a rotor center attached to a shaft of a rotor and the rotor center portion are surrounded, A stator core and a stator coil provided in a stator frame attached to a casing through which a shaft passes, and an air cooler provided in the casing, and ventilation holes that pass cooling air through the air cooler and the rotor center. And a magnetic pole, a stator core, and a stator coil are circulated to cool the magnetic pole, the stator core, and the stator coil. A first axial-flow fan having a row of blades arranged on the outer peripheral surface of a cylindrical first fan boss surrounding the shaft provided on the end surface, and a cylindrical second fan surrounding the shaft provided on the other side surface. Place the blade row on the outer peripheral surface of the boss The blowing direction of the cooling air from the first axial flow fan is intended to comprise a second axial flow fan that is in the same direction.

Further, in the above-described cooling air ventilation device for a rotating electric machine, a blade row is arranged on the inner peripheral surface of the second fan boss,
Axial flow fan and cooling air are blown in opposite directions
And a cylindrical first fan guide that surrounds the outer circumference of the blade row of the second axial flow fan, a cylindrical second fan guide that surrounds the outer circumference of the blade row of the third axial flow fan, and Second and third axial fans, first and second facing the second fan boss
And an air duct including a side plate that closes an opening between the fan guide and the fan guide.

A plurality of divided air ducts in which the inside of the air duct faces the second and third axial flow fans and the second fan boss and is divided by a plurality of straightening plates arranged in the radial direction of the rotor shaft. Shall be formed. In addition, in the above cooling air ventilation device for a rotating electric machine, the length of the cylindrical second fan boss is increased so that the second fan boss is moved from the installation position of the second axial fan and the third axial fan. The distance to the end face of
The length of the cooling air flow can be rectified by preventing the occurrence of flow turbulence due to a sudden change in the flow direction due to the air supply and suction of the cooling air to the second and third axial fans. Is formed by a plurality of divided air ducts facing the second and third axial fans and divided by a plurality of flow straightening plates arranged in the radial direction of the rotor shaft, and the side plate of each divided air duct and the first air duct are formed. A curved air guide for guiding the flow of cooling air is provided at each corner formed by the second fan guide and the second fan guide.

Further, in the rotating electric machine having the first and second axial fans, the cooling air of the first and second axial fans cools the magnetic poles, the stator core and the stator coil and flows out. A guide plate for rectifying the cooling air flowing into the blade row of the axial fan is provided on the suction side of the axial fan on the side. In addition, the blades forming the blade row of the axial flow fan on the side where the cooling air cools the magnetic poles, the stator core and the stator coil and flows out are movable blades that can change the direction of the blades.

Further, a magnetic pole attached to the outer peripheral surface of a rotor center attached to the shaft of the rotor and a stator frame attached to a casing which surrounds the rotor center portion and through which the shaft penetrates are provided with ventilation holes. Equipped with a stator core and a stator coil that do not include an air cooler, and an air cooler provided in the casing, and an air cooler for cooling air, a ventilation hole penetrating the rotor center, a magnetic pole, a stator core, and a stator. In a cooling air ventilation device for a rotating electric machine, which circulates between a coil and a magnetic pole, a stator core, and a stator coil, a cylinder surrounding the shaft provided on one end surface of both end surfaces of the outer peripheral surface of the rotor center. A first axial fan provided with a blade row on the outer peripheral surface of the first fan boss and further attached to a casing, and having a first fan guide surrounding the outer periphery of the blade row, and provided on the other end surface Enclose the axis A blade row is arranged on the outer peripheral surface of the cylindrical second fan boss, and a second fan guide that is attached to the casing and surrounds the outer periphery of the blade row is provided, and the first axial fan and the cooling air The first and second fan guides are connected to the second axial fan having the same blowing direction and the first and second fan guides.
And an extraction hole that returns a part of the cooling air sent from each of the axial fans to the suction side.

[0016]

When the rotating electric machine is operated, the magnetic poles of the rotor, the stator core of the stator and the stator coil, which heat up due to heat generation, are fed by an axial fan attached to the rotor to rotate with the air cooler. Cooling is performed by cooling air that is cooled by an air cooler that circulates between the ventilation holes provided through the rotor center of the child, the magnetic poles, the stator core, and the stator coil.

In this case, the axial fan is attached to one of the two end surfaces of the rotor center, and the first row of blades is arranged on the outer peripheral surface of the cylindrical first fan boss surrounding the rotor shaft.
Of the axial fan and the first axial fan in which the blade rows are arranged on the outer peripheral surface of the cylindrical second fan boss that is attached to the other end surface and surrounds the shaft of the rotor, and the blowing direction is the same direction. By providing the second axial fan, the first and second axial fans are arranged in series, so that if the first and second axial fans have the same performance, the cooling air will have the same wind pressure. Is about doubled, and the magnetic pole, the stator core and the stator coil are cooled.

In the above, a row of blades is arranged on the inner peripheral surface of the second cylindrical fan boss, and a third axial fan whose blowing direction is opposite to that of the second axial fan is provided. The first cylindrical cylindrical fan guide that surrounds the outer peripheral surface of the blade row of the second axial fan, the second cylindrical cylindrical fan guide that surrounds the outer peripheral surface of the blade row of the third axial fan, and the second and third Axial fan,
A first axial fan, a third axial fan, a second axial fan, and a second axial fan are provided by providing an air duct which faces the second fan boss and closes an opening between the first and second fan guides. The axial fans will be arranged in series in this order. Here, the cooling air sent from the third axial fan changes its flow direction rapidly in the air duct, that is, U
When it turns, it is sucked into the second axial fan, the pressure is increased, and the air is sent.

As described above, the cooling winds sent by the first, third, and second axial fans arranged in series have the wind pressures of the first, second, and third axial fans. With the same performance, the magnetic pole, the stator core and the stator coil are cooled about three times as much as one axial fan. In the above case, the third
Of the axial flow fan, the flow direction changes rapidly in the air duct, that is, while the U-turn is made and the second axial flow fan sucks the air, a swirling flow in the rotational direction is generated by the rotation of the rotor. The suction efficiency of the second axial fan decreases. Therefore, the inside of the air duct faces the second and third axial fans and the second fan boss and is divided by a plurality of straightening plates arranged in the radial direction of the rotor shaft to form a plurality of divided air ducts. As a result, the swirling flow in the rotation direction is prevented, so that the reduction in fan efficiency is prevented.

Further, the length of the second fan boss is increased so that the distance from the installation position of the second and third axial fans to the end surface of the fan boss is fed from the third axial fan. The direction in which the cooling air flows in the air duct changes suddenly, that is, when a U-turn is made and the air is sucked into the second axial fan, the occurrence of turbulence due to the interference between the flow on the air supply side and the flow on the suction side is prevented, and cooling Of a curved surface for guiding the flow of U-turn of the cooling air to the corner portion formed by the cylindrical first and second fan guides and the side plate that configure the air duct, and having a length that can rectify the flow for the air flow. By providing the straightening vanes, the cooling air sent from the third axial fan flows into the air ducts in a straightened state, and the U-shaped ducts in the air ducts in the air ducts have smaller ventilation resistance with a smaller ventilation resistance. Turn,
Since it is sucked in the state of being rectified by the second axial fan,
Prevents reduction in fan efficiency.

Further, of the first and second axial fans, the cooling air is sucked into the axial fan (hereinafter referred to as axial fan I) on the side where the cooling air cools the magnetic pole, the stator core and the stator coil and flows out. The cooling air entrained is agitated by the rotation of the magnetic poles accompanying the rotation of the rotor, and swirling flow or vortex is generated. Therefore, by providing a guide plate on the suction side of the axial fan to rectify the cooling air flowing into the blade row of the fan, the agitated cooling air is rectified by the guide plate and sucked into the axial fan. An ideal fan characteristic can be obtained by arranging the axial fan I and the other axial fan in series.

The cooling air sucked into the axial fan I is rotated by using movable blades whose blade mounting angles can be changed so that the blades of the blade row of the axial fan I can be changed. The mounting angle of the blades of the movable blades is adjusted so that the cooling air is agitated by the rotation of the magnetic poles accompanying the rotation of the child and is sent out under the optimum conditions according to the flow of the cooling air, and the axial fan I and the other axial flow are adjusted. Ideal fan characteristics can be obtained by arranging the fan in series.

By the way, when the stator core is not provided with ventilation holes through which cooling air flows, a casing provided with a stator frame enclosing the outer circumferences of the blade rows of the first and second axial fans, respectively. Each of the first and second fan guides attached to the fan is provided with an extraction hole that returns a part of the cooling air sent by the first and second axial fans to the respective suction sides. Since a part of the cooling air sent from the fan is returned to the suction side in a circulating flow, the end of the stator coil is cooled by this circulating flow.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view of a rotary electric machine equipped with a cooling air ventilation device according to the first embodiment of the present invention. In addition, in FIG. 1 and FIGS.
2, the same parts as those of the conventional example of FIG. 13 are designated by the same reference numerals, and the description thereof will be omitted. 1 differs from the conventional example in that
The shaft 2 is attached to the end face of the yoke 5 on the opposite side of the cylindrical fan boss 15 attached to the yoke 5 of the rotor center 6 of the rotor 1.
A cylindrical fan boss 30 that surrounds the fan is provided, and a row of blades is arranged on the outer peripheral surface of the fan boss 30. The fan has the same performance as that of the axial fan 14, for example, an axial fan having the same blowing direction as the axial fan 14. The axial fan 31 is provided, and the axial fan 3 is further provided.
That is, the fan guide 32 surrounding the outer periphery of the blade row of No. 1 is provided.

With this structure, the cooling air sent from the axial fan 14 is cooled by the air cooler 20 and then sucked into the axial fan 31 through the ventilation holes 3 of the rotor center 6. Air pressure is increased and air is fed between the magnetic poles 7 and the stator core 1.
1, the magnetic pole 7, the stator core 11, and the stator coil 12 are cooled. The cooling air that has been cooled and raised in temperature is sucked into the axial fan 14 and circulates through the above-described path. Here, since the axial fans 14 and 31 are arranged in series, the air pressure sent from the axial fan 31 is about twice that of the conventional one. The amount of circulating cooling air is about 1.4 times that of the conventional one.

FIG. 2 is a partial sectional view of a rotary electric machine provided with a cooling air ventilation device according to the second embodiment of the present invention. In FIG. 2, an axial flow fan having blade rows arranged on the inner peripheral surface of a cylindrical fan boss 30 and having a direction opposite to the blowing direction of the axial flow fan 31, for example, an axial flow fan 33 having the same performance as the axial flow fan 14 is provided. And a cylindrical fan guide 34 that surrounds the outer periphery of the blade row of the axial fan 31, a cylindrical fan guide 35 that surrounds the outer periphery of the blade row of the axial fan 33, and the casing 1
3, except that an air duct 37 composed of 3 and 3 is provided.

FIG. 3 is a view taken in the direction of arrow P in FIG. 2 showing the arrangement of the blade rows of the axial fan 31 and the axial fan 33. In FIG. 3, the blades 38 of the blade row shown by the broken line of the axial fan 31 and the blades 39 of the blade row shown by the solid line of the axial fan 33 are arranged in opposite directions when seen in a plan view, and are arranged in the respective fan bosses 30. It is arranged on the inner peripheral surface and the outer peripheral surface. The solid and dashed arrows indicate the flow of cooling air. Reference numeral 40 is a mounting bolt for mounting the fan boss 30 to the yoke 5 of the rotor center 6.

With such a configuration, the cooling air that has been pressurized and sent from the axial flow fan 14 is cooled through the air cooler 20, and the cooled cooling air is provided in the ventilation hole 3 of the rotor center 6.
The cooling air that has been sucked into the axial flow fan 33 via the air flow and has been boosted and sent into the air duct 37 flows into the air duct 37 where it makes a U-turn and is sucked into the axial flow fan 31 to be boosted and sent to the magnetic pole 7 Between the magnetic poles 7, while flowing through the ventilation holes 10 of the stator core 11.
The stator core 11 and the stator coil 12 are cooled. The cooling air that has been cooled and raised in temperature is sucked into the axial fan 14 and circulates in the above-described path.

Due to the arrangement of three axial fans in series, the pressure of the cooling air sent from the axial fan 31 is
This is about three times that of the conventional axial flow fan 14 alone. Figure 4
5 is a partial cross-sectional view of a cooling air ventilation device for a rotary electric machine according to an embodiment of claim 3 of the present invention, and FIG. 5 is a partial cross-sectional view taken along line AA of FIG. In FIG. 4 and FIG. 5, a plurality of straightening vanes 41 are arranged inside the air duct 37 in the radial direction of the shaft 2 of the rotor 1.
Attached to the fan guides 34, 35 and the casing 13,
As shown in FIG. 5, it is formed by a plurality of segmented air ducts 42 partitioned by a current plate 41.

With this structure, the cooling air sent from the axial fan 33 makes a U-turn in each section air duct 42 and is sucked into the axial fan 31. During this flow, the rotor rotates. The swirling flow in the rotation direction due to is prevented by making a U-turn in each section air duct 42, and a decrease in fan efficiency is prevented. FIG. 6 is a partial cross-sectional view of a cooling air ventilation device for a rotating electric machine according to the fourth embodiment of the present invention. In FIG. 6, the length of the fan boss 43 provided with the axial fans 31, 33 is increased so that the axial fans 31, 33
The distance from the installation position of the fan to the end surface of the fan boss 43 is supplied from the axial fan 33 and makes a U-turn to make a U-turn.
When the air is sucked into 1, the direction of the flow of the cooling air changes abruptly, so that the occurrence of turbulence due to the interference between the flow of the cooling air to be sent and the flow of the cooling air to be sucked is prevented, and the flow of the cooling air is prevented. And the end surface of the fan boss 43 in the divided air duct 45 in which the air duct 37 is divided by the straightening plate 44 provided in the radial direction and the casing 1
The distance to 3 is set to the distance d.

Further, curved corner air guides 46 and 47 are provided at the corners of the segmented air duct 45 along the flow of the cooling air that makes a U-turn. With such a configuration, the cooling air sent from the axial fan 33 is rectified and flows along the inner peripheral surface of the fan boss 43 having the distance d, and flows into each section air duct 45. Then, it flows along the curved air guides 46 and 47 of the segmented air duct 45 and U
As it turns, it flows straightened along the outer peripheral surface of the fan boss 43 having a distance d, and is sucked into the axial fan 31, so that the cooling air sent from the axial fan 33 changes its flow direction rapidly. That is, the occurrence of turbulence caused by the interference between the flow on the air supply side and the flow on the suction side when U-turned and sucked by the axial fan 31 is prevented, and thus the reduction in fan efficiency is prevented,
Further, the ventilation resistance due to the U-turn of the cooling air is also reduced. 7 is a partial sectional view of a rotary electric machine provided with a cooling air ventilating device according to a fifth embodiment of the present invention, and FIG. 8 is a partial sectional development view of BB of FIG. In FIGS. 7 and 8, the axial flow fan 1 provided on the fan boss 15 on the side where the cooling air cools the magnetic pole 7, the stator core 11 and the stator coil 12 and is sent out.
4 is the same as that shown in FIG. 1 except that the guide plate 50 is provided on the suction side of the blade row and attached to the fan guide 16 surrounding the outer periphery of the blade row. Here, the guide plate 50 is provided with the same number of arc-shaped members as shown in FIG. 10 as the blades of the blade row of the axial fan 14. The number of guide plates 50 does not necessarily have to be the same as the number of blades in the blade row, and the guide plates 50 may have a linear shape.

With this structure, the cooling air sent from the axial fan 31 passes through the magnetic pole 7, the ventilation holes 10 of the stator core 11 and the stator coil 12 to cool them, and then the axial fan. 14 is sucked in and sent out. On this occasion,
Due to the rotation of the magnetic poles 7 accompanying the rotation of the rotor center 6, the cooling air flowing between the magnetic poles 7 and flowing out is agitated and flows out with a swirling flow or vortex. The cooling air thus agitated is rectified by the guide plate 50, sucked into the axial fan 14, and pressurized and delivered by the axial fan 14. Therefore, ideal fan characteristics can be obtained by arranging the axial fans 14 and 31 in series.

FIG. 9 is a partial sectional view of a rotary electric machine provided with a cooling air ventilation device according to a sixth embodiment of the present invention, and FIG. 10 is a partial sectional developed view of CC of FIG. In FIG. 9 and FIG. 10, a stem 52 having a screw at its tip is provided at the base of the blade 51 of the blade row of the axial fan 14 attached to the fan boss 15.
The stem 52 is installed in the hole of the fan boss 15 and fastened with the nut 53.
Is the same as that of FIG. 1 except that the movable wing whose direction is changed is used.

In FIGS. 9 and 10, the cooling air that flows out by cooling the magnetic pole 7, the stator core 11 and the stator coil 12 as described above is caused by the rotation of the magnetic pole 7 as the rotor center 6 rotates. However, the mounting angle of the blades 51 is adjusted to optimize the inflow of the cooling air into the axial fan 14 via the stem 52, and the direction of the blades 51 is changed. Then, by fastening with the nut 53, ideal fan characteristics due to the axial arrangement of the axial fans 14 and 31 are obtained.

FIG. 11 is a partial sectional view of a rotary electric machine provided with a cooling air ventilation device according to the seventh embodiment of the present invention.
11, the stator core 11 does not have the ventilation hole 10 shown in FIG. The fan guide 16 attached to the stator frame 9 surrounds the outer circumference of the blade row of the axial fan 14.
And enclosing the outer periphery of the blade row of the axial flow fan 31,
3 is the same as FIG. 1 except that a plurality of bleed holes 54 and 55 are provided in the fan guide 32 attached to the fan 3.

The size and quantity of the extraction holes 54, 55 are adjusted depending on the cooling condition of the ends of the stator coil 12 which will be described later. With such a configuration, part of the cooling air sent from the axial fans 14 and 31 passes through the extraction holes 54 and 55 of the fan guides 16 and 32, respectively.
It returns to the suction side of 31 and circulates. By circulating this cooling air, the end portions of the stator coil 12 can be cooled even if the ventilation holes 10 are not provided in the stator core 11.

[0037]

As is apparent from the above description, according to the present invention, the stator of the rotating electric machine and the cooling air for cooling the rotor are arranged in series according to the first aspect of the present invention.
Since the air is sent from the single axial fan, the wind pressure of the cooling air becomes higher than that of the conventional single axial fan.

In the second aspect, the cooling air for cooling the stator and the rotor of the rotating electric machine is sent by the three axial fans arranged in series, so that the two axial fans are used. Higher than the one. Therefore, according to claims 1 and 2, since the wind pressure of the cooling air becomes high, it can be adopted even if the ventilation resistance in the rotating electric machine becomes large, and the application range of the self-ventilation method is expanded.

In the third aspect of the present invention, cooling air is sent to the axial fan installed on the outer peripheral surface and the inner peripheral surface of the fan boss, respectively.
Since the divided air duct is provided in the air duct that makes a U-turn to suck in, the cooling air prevents the generation of a swirling flow in the rotation direction due to the rotation of the rotor, thereby preventing a decrease in fan efficiency. According to claim 4, the distance from the installation position of the axial fan provided on the outer peripheral surface and the inner peripheral surface of the fan boss to the end surface of the fan boss is increased, and the air guide is provided at the corner portion of the air duct. Cooling air is rectified and sent to and sucked into the axial fans provided on the inner peripheral surface respectively, and the U-turn of the cooling air in the air duct flows along the air guide, so that the fan efficiency is prevented from lowering and U Ventilation resistance during turns is also reduced.

In the fifth aspect, the cooling air is guided to the suction side of the axial fan provided on the side where the cooling air of the first and second axial fans cools and flows out the magnetic poles, the stator core and the stator coil. Since the plate is provided, the cooling air flowing out from between the magnetic poles is agitated by the rotation of the magnetic poles, but the cooling air flowing into the axial fan is rectified by the guide plate, so that the first and second axial fans are provided. Ideal fan characteristics can be obtained by arranging in series.

In the sixth aspect of the present invention, of the first and second axial flow fans, the direction of the blade of the blade row of the axial flow fan on the side where the cooling air cools the magnetic poles, the stator core and the stator coil and flows out. By changing the movable blades with different mounting angles, the cooling air flowing out between the magnetic poles is agitated by the rotation of the magnetic poles, but the moving airflow of the movable blades is optimized to optimize the inflow of the cooling air flowing into the axial fan. Since the orientation can be adjusted, ideal fan characteristics can be obtained by arranging the first and second axial fans in series.

According to a seventh aspect of the present invention, when there is no ventilation hole in the stator core, a part of the cooling air sent from each axial fan is extracted from the extraction holes provided in the fan guides of the first and second axial fans. Is returned to the suction side of each axial fan for circulation through the extraction holes, so that the end portion of the stator coil can be cooled by the circulating flow of the cooling air even if the stator iron core does not have a ventilation hole.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a rotating electric machine including a cooling air ventilation device according to an embodiment of claim 1 of the present invention.

FIG. 2 is a partial sectional view of a rotary electric machine provided with a cooling air ventilation device according to an embodiment of claim 2 of the present invention.

FIG. 3 is a partial view seen from an arrow P in FIG.

FIG. 4 is a partial cross-sectional view of a cooling air ventilation device for a rotating electric machine according to an embodiment of claim 3 of the present invention.

5 is a partial cross-sectional view taken along the line AA of FIG.

FIG. 6 is a partial cross-sectional view of a cooling air ventilation device for a rotating electric machine according to an embodiment of claim 4 of the present invention.

FIG. 7 is a partial cross-sectional view of a rotating electric machine including a cooling air ventilation device according to an embodiment of claim 5 of the present invention.

FIG. 8 is a partial cross-sectional development view of BB of FIG.

FIG. 9 is a partial cross-sectional view of a rotating electric machine including a cooling air ventilation device according to an embodiment of claim 6 of the present invention.

FIG. 10 is a partial cross-sectional development view of CC of FIG.

FIG. 11 is a partial cross-sectional view of a rotating electric machine including a cooling air ventilation device according to an embodiment of claim 7 of the present invention.

FIG. 12 is a partial cross-sectional view of a rotating electric machine including a conventional cooling air ventilation device.

FIG. 13 is a partial cross-sectional view of a rotating electric machine including different conventional cooling air ventilation devices.

[Explanation of symbols]

 1 Rotor 2 Axis 3 Ventilation Hole 6 Rotor Center 7 Magnetic Pole 8 Stator 9 Stator Frame 11 Stator Core 12 Stator Coil 13 Casing 14 Axial Fan 15 Fan Boss 16 Fan Guide 20 Air Cooler 30 Fan Boss 31 Shaft Flow fan 32 Fan guide 33 Axial flow fan 34 Fan guide 35 Fan guide 37 Air duct 41 Straightening plate 42 Division air duct 43 Fan boss 44 Straightening plate 45 Division air duct 46 Air guide 47 Air guide 50 Guide plate 54 Extraction hole 55 Extraction hole

Claims (7)

[Claims] 1. A magnetic core mounted on the outer peripheral surface of a rotor center mounted on a shaft of a rotor, and a stator core provided on a stator frame which is mounted on a casing which surrounds the rotor center portion and which penetrates the shaft. And a stator coil and an air cooler provided in the casing, and circulates cooling air between the air cooler, the ventilation holes penetrating the rotor center, the magnetic poles, the stator core and the stator coil. In the cooling air ventilation device of the rotating electric machine for cooling the magnetic pole, the stator core and the stator coil, the cylindrical first fan boss surrounding the shaft provided on one end face of both end faces of the rotor center. And a first axial flow fan having a row of blades arranged on the outer peripheral surface thereof, and a second row of fan bosses surrounding the shaft provided on the other end surface of the second blade boss having a row of blades arranged to form the first axial flow. The fan and cooling air are blown in the same direction. Cooling air ventilation device for a rotary electric machine, characterized in that a axial fan. 2. The third axial fan according to claim 1, wherein a blade row is arranged on the inner peripheral surface of the second fan boss, and the second axial fan has a blowing direction opposite to that of the second axial fan. A cylindrical first fan guide that surrounds the outer circumference of the second axial fan blade row, and a cylindrical second fan that surrounds the outer circumference of the third axial fan blade row
Fan guide, second and third axial fans, and an air duct comprising side plates closing an opening between the first and second fan guides facing the second fan boss. Cooling air ventilation device for rotating electric machines. 3. The plurality of air ducts according to claim 2, wherein the inside of the air duct faces the second and third axial fans and the second fan boss and is arranged in the radial direction of the rotor shaft. A cooling air ventilation device for a rotating electric machine, characterized in that it is formed by a plurality of divided air ducts divided by a current plate. 4. The second fan boss according to claim 2, wherein the length of the cylindrical second fan boss is increased, and the second fan boss is installed from the installation position of the second axial fan and the third axial fan. The distance to the end face of the cooling air is rectified by preventing the occurrence of flow turbulence due to a sudden change in the flow direction due to the air supply and suction of the cooling air to the second and third axial fans. The length of the air duct, and the inside of the air duct is formed by a plurality of divided air ducts that face the second and third axial fans and are divided by a plurality of straightening plates arranged in the radial direction of the rotor axis. A cooling air ventilation device for a rotary electric machine, wherein curved corner air guides for guiding the flow of cooling air are provided at respective corners formed by the side plates of the divided air ducts and the first and second fan guides. 5. The side according to claim 1, 2, 3 or 4, wherein the cooling air, of the first and second axial fans, cools the magnetic poles, the stator core and the stator coil and flows out. A cooling air ventilation device for a rotary electric machine, characterized in that a guide plate for rectifying the cooling air flowing into the blade row of the axial fan is provided on the suction side of the axial fan. 6. The cooling fan according to claim 1, 2, 3, 4 or 5, wherein the cooling air of the first and second axial fans cools the magnetic poles, the stator core and the stator coil and flows out. A cooling air ventilation device for a rotary electric machine, characterized in that the blades forming the blade row of the axial fan on the rotating side are movable blades that can change the direction of the blades. 7. A magnetic pole attached to an outer peripheral surface of a rotor center attached to a shaft of a rotor, and a stator frame attached to a casing which surrounds the rotor center portion and through which the shaft penetrates. A stator core and a stator coil not including, and an air cooler provided in the casing,
Cooling of a rotating electric machine that circulates cooling air between an air cooler, a ventilation hole penetrating the rotor center, and a magnetic pole, a stator core, and a stator coil to cool the magnetic pole, the stator core, and the stator coil. In the air ventilation device, a blade row is arranged on the outer peripheral surface of a cylindrical first fan boss that surrounds the shaft and is provided on one end surface of both end surfaces of the rotor center, and the blade row is attached to a casing. A first axial fan provided with a first fan guide that surrounds the outer circumference, and a blade row arranged on the outer circumferential surface of a cylindrical second fan boss that surrounds the shaft provided on the other end surface, and is further attached to the casing. A second axial guide provided with a second fan guide that surrounds the outer periphery of the blade row, and a first axial fan and a second axial fan in which cooling air is blown in the same direction;
Cooling air for a rotating electric machine, characterized in that the first and second fan guides are provided with bleed holes for returning a part of the cooling air respectively sent from the first and second axial fans to the suction side. Ventilation device.