JP6710673B2 - Rotating electric machine and rotating electric machine system - Google Patents

Description

The present invention relates to a rotary electric machine system having a rotary electric machine and an external cooling device for cooling a gas for cooling the rotary electric machine.

In a rotating electric machine, iron loss occurs in the stator core and the rotor core, copper loss in the stator winding, and copper loss in the rotor winding when the rotor winding is provided. Iron loss is due to hysteresis loss and eddy current loss. The copper loss is Joule heat. The heat generated by these losses raises the temperatures of the rotor and the stator and causes deterioration of insulation and the like. For this reason, in rotating electrical machines, cooling for removing these heats is important.

A fully-closed internal cooling type rotary electric machine usually has a cooling unit at an upper portion, a side portion, a lower portion or the like of a stator. The inside of the machine is ventilated by an internal fan attached to the rotor to cool the heat generating part and the inside air.

JP-A-57-189548 JP 64-35339 A

In the cooling unit, the cooling efficiency is higher than that of the cooling by the outside air, and therefore the cooling by the water cooler is often performed. When the water cooler is used, there is an advantage that the external fan is unnecessary and the noise is small, but a large and expensive cooling unit is required as compared with the cooling by the outside air. Further, when the cooling water leaks from the water cooler, there is a risk of causing a ground fault of the rotating electric machine, for example, and it is necessary to provide a reliable leak detection device (see Patent Documents 1 and 2).

Therefore, an object of the present invention is to reduce the size and cost of a rotating electric machine that requires cooling.

In order to achieve the above-mentioned object, the present invention provides a rotor shaft that extends in the axial direction and is rotatably supported, and a rotor shaft that is attached to an outer side in the radial direction of the rotor shaft and is spaced apart in the axial direction. A rotor having a rotor core in which a path is formed, and a cylindrical stator core that is provided radially outside of the rotor core and has radial passages formed at intervals in the axial direction. , A stator having a stator winding that penetrates the inside of the stator core in the axial direction and is connected to the axially outer side portions of the stator core, and to the outside in the radial direction of the stator. A frame that is arranged to house the rotor core and the stator; two bearings that support the rotor shaft on both sides of the rotor shaft in the axial direction with the rotor core interposed therebetween; Two bearing brackets that fixedly support the bearings and are connected to the axial end of the frame to form a closed space together with the frame, and a portion of the closed space together with the axial end of the stator core. A rotating electric machine comprising: a first partition plate and a second partition plate that are divided to accommodate the connection parts of the stator windings and form an inner first space and an inner second space, respectively. An air supply port for receiving the cooled cooling gas into the closed space is formed, and a flow path for communication from the air supply port to each of the inner first space and the inner second space is formed. A discharge port for discharging the working gas from the closed space is formed.

A rotating electrical machine system according to the present invention includes the rotating electrical machine of the above-described embodiment, and an external cooling device that cools a cooling gas of the rotating electrical machine, wherein the external cooling device includes an external cooler and the external cooling device. An external cooler and a fan that drives the cooling gas to be circulated in the rotary electric machine, a supply pipe that guides the cooling gas cooled by the external cooler to the rotary electric machine, and a fan that is discharged from the rotary electric machine An exhaust pipe for guiding the cooling gas to the external cooler.

According to the present invention, it is possible to reduce the size and cost of a rotating electric machine that requires cooling.

It is a longitudinal section showing the composition of the rotary electric machine system concerning a 1st embodiment. It is a longitudinal section showing the composition of the rotary electric machine system concerning a 2nd embodiment. It is a longitudinal cross-sectional view which shows the structure of the part related to cooling in the rotary electric machine which concerns on 2nd Embodiment. It is a fragmentary longitudinal section showing composition of a connecting structure of a rotary electric machine concerning a 2nd embodiment. It is a partial longitudinal cross-sectional view which shows the structure of the connection structure of the rotary electric machine which concerns on 3rd Embodiment.

Hereinafter, a rotary electric machine and a rotary electric machine system according to embodiments of the present invention will be described with reference to the drawings. Here, parts that are the same or similar to each other are designated by common reference numerals, and duplicate description will be omitted.

[First Embodiment]
FIG. 1 is a vertical cross-sectional view showing the configuration of the rotary electric machine system according to the first embodiment. The rotary electric machine system 200 includes a rotary electric machine 150 and an external cooling device 100.

The rotary electric machine 150 includes a rotor 10, a stator 20, a bearing 30, a frame 40, and a bearing bracket 45.

The rotor 10 penetrates through a rotor shaft 11 extending in a rotation axis direction (hereinafter, referred to as an axial direction), a cylindrical rotor core 15 attached to an outer side in a radial direction of the rotor shaft 11, and a rotor core 15. Rotor winding 17 for

The rotor shaft 11 is rotatably supported by bearings 30 on both outer sides of the rotor core 15 in the axial direction. No coupling portion is provided at one end portion (first end portion) of the rotor shaft 11, but at the other end portion (second end portion), the object of coupling, that is, the rotary electric machine 150 is a motor. In this case, the rotating electric machine 150 is a drive target, and when the rotating electric machine 150 is a generator, it is a prime mover. Hereinafter, in the rotary electric machine 150, the side where the coupling portion 11a is provided is referred to as a coupling side, and the opposite side is referred to as an anti-coupling side.

On the surface of the rotor shaft 11, an axial flow passage 11b is formed which is a flow passage extending in the axial direction between the rotor shaft 11 and the rotor core 15. The axial flow passage 11b can be formed by forming grooves extending in the axial direction at intervals on the surface of the rotor shaft 11 in the circumferential direction. Alternatively, a rib may be provided between the rotor shaft 11 and the rotor core 15, and an annular space formed by the rib and extending in the axial direction may be used as the axial flow passage.

The rotor core 15 is provided with a plurality of rotor core inner ducts 16 that are a plurality of radial flow paths and are spaced from each other along the axial direction. The rotor core inner duct 16 is a flow path that communicates from the radially inner side of the rotor core 15 to the radially outer side thereof.

The rotor winding 17 is connected to the outside of the rotor core 15 on the side opposite to the coupling portion in the axial direction and on the outside of the coupling portion, and is connected to each other or connected to the outside. Have.

The stator 20 has a stator core 21 and a stator winding 22. The stator core 21 is provided radially outside the rotor core 15 with a gap 18 in between, and has a cylindrical shape. The stator core 21 is provided with a plurality of stator core inner ducts 23 that are radial passages and are spaced from each other along the axial direction. The stator core inner duct 23 is a flow path that communicates from the radially inner side to the radially outer side of the stator core 21.

A plurality of slots (not shown) are formed on the radially inner surface of the stator core 21 so as to extend axially through the stator core 21 at intervals in the circumferential direction.

The stator windings 22 pass through the plurality of slots and are connected to each other or to the outside on the outer side of the stator core 21 on the side opposite to the coupling portion in the axial direction and on the outer side of the coupling portion side. The connecting portion 22a and the connecting portion 22b are provided.

The rotor core 15 and the stator 20 are housed in the frame 40. Bearing brackets 45 are provided on both ends of the frame 40 in the axial direction. Each of the bearing brackets 45 supports the bearing 30 stationary.

The frame 40 and the two bearing brackets 45 cooperate with each other to form a closed space 47. The frame 40 is formed with air supply ports 48c and 48d for receiving the cooling gas cooled from the outside. Here, the air supply ports 48c and 48d may be provided in either or both of the bearing brackets 45. Further, each of the two bearing brackets 45 is formed with a discharge port 49 for discharging the cooling gas in the rotary electric machine 150. The discharge port 49 may be provided only in one of the bearing brackets 45. Alternatively, it may be formed on the frame 40.

The closed space 47 is provided with a first partition plate 42a and a second partition plate 42b.

The first partition plate 42a surrounds the connection portion 17a on the anti-coupling side of the rotor winding 17, and the connection portion 22a on the anti-coupling side of the stator winding 22. The first partition plate 42a is rotationally symmetrical and has a shape in which one side in the axial direction is opened, and the end portion on the open side is connected to the end portion in the axial direction of the stator core 21, and The inner first space 47a is formed together with the axial end portion. An air supply communication pipe 48a, which is a flow path for communication, is provided between the inner first space 47a and the air supply port 48c, and the inner first space 47a and the air supply port 48c are connected to each other. Are in communication with each other.

The rotor shaft 11 penetrates through the center of the first partition plate 42a, and a cylindrical seal portion 43a is formed in the penetrating portion of the rotor shaft 11. The inner diameter of the seal portion 43a is formed so as to be larger than the outer diameter of the rotor shaft 11 by a margin considering vibration of the rotor shaft 11 in the radial direction and the like.

The second partition plate 42b surrounds the connection portion 17b on the coupling side of the rotor winding 17 and the connection portion 22b on the coupling side of the stator winding 22. The shape of the second partition plate 42b is similar to the shape of the first partition plate 42a, and together with the axial end portion of the stator core 21, an inner second space 47b is formed. A tubular seal portion 43b is formed in the penetrating portion of the rotor shaft 11. As a result, the second partition plate 42b forms the inner second space 47b in the closed space 47. An air supply communication pipe 48b, which is a flow path for communication, is provided between the inner second space 47b and the air supply port 48d, and the inner second space 47b and the air supply port 48d are connected to each other. Are in communication with each other.

Each of the first partition plate 42a and the second partition plate 42b may be a split structure that can be coupled to surround and mount the rotor shaft 11.

As described above, the closed space 47 is divided into three spaces, that is, the inner first space 47a, the inner second space 47b, and the outer partition space 47c outside these spaces.

In addition, the seal portions 43a and 43b are not simply cylindrical, and have a labyrinth structure that axially divides the space between the rotor shaft 11 and the rotor shaft 11, for example. A structure for suppressing leakage from the space 47a to the outer partition space 47c and leakage from the second inner space 47b to the outer partition space 47c may be used.

The external cooling device 100 includes an external cooler 101, a fan 102, a supply pipe 103, and an exhaust pipe 104.

The external cooler 101 cools the cooling gas that is the cooling gas in the rotating electric machine 150. The cooling medium for cooling the cooling gas of the external cooler 101 may be air or water. Further, it may be a non-contact type heat exchanger or a contact type heat exchanger. Appropriate ones can be used depending on the installation location. Further, depending on the case, an ordinary commercial product may be used.

The fan 102 circulates a cooling gas between the rotating electric machine 150 and the external cooler 101. Although FIG. 1 shows the case where the number of fans is one, it may be two or more.

The supply pipe 103 guides the cooling gas cooled by the external cooler 101 to the rotating electric machine 150. Further, the exhaust pipe 104 is connected to an exhaust port 49 formed in the rotating electric machine 150, cools the inside of the rotating electric machine 150, and guides the cooling gas discharged from the rotating electric machine 150 to the fan 102. The two exhaust pipes 104 are one upstream of the fan 102.

1 shows the case where the fan 102 is located upstream of the external cooler 101, the fan 102 may be located downstream of the external cooler 101.

Next, the flow of the cooling gas in the rotary electric machine system 200 according to the present embodiment will be described. The dashed arrow in FIG. 1 indicates the flow direction of the cooling gas.

First, the cooling gas is sent to the external cooler 101 by the fan 102, cooled by a cooling medium such as water, and sent to the rotary electric machine 150 by the supply pipe 103.

The cooling gas that has reached the rotating electric machine 150 first enters from the supply pipe 103 into the air supply port 48c formed in the frame 40, and passes through the air supply communication pipe 48a that communicates with the inner first space 47a. Flow into. The cooling gas flowing into the inner first space 47a passes through the inner first space 47a while cooling the connection portion 17a on the anti-coupling side of the rotor winding 17 and the connection portion 22a on the coupling side of the stator winding 22. Then, it flows into the axial flow path 11b formed in the rotor shaft 11 and the space 18 between the rotor core 15 and the stator core 21.

Further, the cooling gas that has entered the air supply port 48d formed in the frame 40 from the supply pipe 103 flows into the inner second space 47b via the air supply communication pipe 48b that communicates with this. The cooling gas flowing out into the inner second space 47b passes through the inner second space 47b while cooling the connection portion 17b on the coupling side of the rotor winding 17 and the connection portion 22b on the coupling side of the stator winding 22. Then, it flows into the axial flow path 11b formed in the rotor shaft 11 and the space 18 between the rotor core 15 and the stator core 21.

The cooling gas that has flowed into the axial flow path 11b is sequentially divided in the portion where the rotor core inner duct 16 is provided and flows into the rotor core inner duct 16. The cooling gas that has flowed into each of the plurality of rotor core inner ducts 16 passes through the rotor core inner duct 16 toward the outer side in the radial direction while cooling the rotor core 15 and the rotor windings 17. It flows out from the iron core 15 into the void 18.

The cooling gas flowing into the gap 18 flows from the gap 18 into a plurality of stator core inner ducts 23 formed in the stator core 21, and while cooling the stator core 21 and the stator windings 22, the stator It passes through the in-core duct 23 toward the outer side in the radial direction, and flows out from the stator core 21 to the outer partition space 47c on the outer side in the radial direction.

The cooling gas that has flown into the outer partition space 47c is divided into a coupling side and an anti-coupling side, and then flows out into the exhaust pipe 104 from the exhaust ports 49 formed in the respective bearing brackets 45. The cooling gas flowing out to the exhaust pipe 104 is sent to the external cooler 101 again by the fan 102.

In the present embodiment configured as described above, the rotor shaft 11 of the rotary electric machine 150 is not provided with the internal fan, and the axial length of the rotary electric machine 150 is shortened as compared with the case where the internal fan is provided. be able to. Further, the rotary electric machine 150 is not provided with a cooler for cooling the cooling gas. Therefore, the rotary electric machine 150 can be significantly downsized.

Further, since the external cooler 101 and the fan 102 only have to respectively secure the cooling function and the air blowing function independently of the structure of the rotating electric machine 150, depending on the case, respective standard products or the like may be used. It will be possible.

Furthermore, since the rotary electric machine system 200 can be divided into the rotary electric machine 150 and the external cooling device 100, restrictions on the arrangement are reduced, and the number of cases where the rotary electric machine system 200 can be installed even in a narrower space than the conventional case increases.

As described above, according to the present embodiment, it is possible to reduce the size of the rotating electric machine and reduce the manufacturing cost.

[Second Embodiment]
FIG. 2 is a vertical cross-sectional view showing the configuration of the rotary electric machine system according to the second embodiment. The second embodiment is a modification of the first embodiment.

In the rotary electric machine 150 according to the second embodiment, a flow path is formed inside the rotor shaft 11, and a connection structure 110 is provided at the first end portion of the rotor shaft 11 on the anti-coupling side. .. The supply pipe 103 is connected to the connection structure 110. As a result, the air supply port and the communication flow path are different from those in the first embodiment. The other points are similar to those of the first embodiment.

FIG. 3 is a vertical cross-sectional view showing a configuration of a portion related to cooling in the rotary electric machine. A broken line arrow in FIG. 3 indicates the flow direction of the cooling gas. The connection structure 110 having the air supply port will be described later with reference to FIG.

In the rotor shaft 11, an axial flow passage 12 is formed at an axial center position inside the rotor shaft 11 so as to extend in the axial direction from an end portion on the anti-coupling side to a midpoint of the rotor shaft 11. A plurality of flow channels branch from the axial flow channel 12. Specifically, at least one first branch flow channel 13a communicating from the axial flow channel 12 to the inner first space 47a, and at least one second branch flow communicating from the axial flow channel 12 to the inner second space 47b. A central branch flow passage 13c is formed that connects the passage 13b and the axial flow passage 12 to the rotor core inner duct 16.

Chuo branch channel 13c is provided in correspondence with the axial position of the rotor core duct 16 in a plurality of locations are provided in the axial direction.

Each of the first branch flow channel 13a, the second branch flow channel 13b, and the central branch flow channel 13c is a through hole extending from the axial flow channel 12 to the surface of the rotor shaft 11, and at the same axial position, in the circumferential direction. At least one is formed. In addition, a plurality of these may be provided at one axial position with a space therebetween in the circumferential direction.

As described above, in the second embodiment, the communication flow path for transferring the cooling gas received by the connection structure 110 to the inner first space 47a and the inner second space 47b is provided in the rotor shaft 11. Has been formed.

Next, the flow of the cooling gas in the rotary electric machine 150 will be described.

The cooling gas flowing into the rotating electric machine 150 first flows from the supply pipe 103 via the connection structure 110 into the axial flow passage 12 formed in the rotor shaft 11. The cooling gas that has flowed into the axial flow passage 12 sequentially branches to the first branch flow passage 13a, the central branch flow passage 13c, and the second branch flow passage 13b before reaching the end point of the axial flow passage 12. To go.

The cooling gas branched to the first branch flow path 13a flows out from the rotor shaft 11 into the inner first space 47a. The cooling gas flowing out into the inner first space 47a cools the connection part 17a on the anti-coupling side of the rotor winding 17 and the connection part 22a on the anti-coupling side of the stator winding 22 while cooling the inner connection part 47a. To flow into the void 18.

The cooling gas branched to the central branch flow passage 13c flows from the rotor shaft 11 into the plurality of rotor core inner ducts 16 formed in the rotor core 15. The cooling gas that has flowed into each of the plurality of rotor core inner ducts 16 formed in the rotor core 15 radially cools the rotor core inner duct 16 while cooling the rotor core 15 and the rotor winding 17. It passes toward the outside and flows out from the rotor core 15 into the gap 18.

The cooling gas flowing into the second branch flow path 13b flows out from the rotor shaft 11 into the inner second space 47b. The cooling gas flowing out into the inner second space 47b passes through the inner second space 47b while cooling the connection portion 17b on the coupling side of the rotor winding 17 and the connection portion 22b on the coupling side of the stator winding 22. And flows into the void 18.

As described above, the cooling gases that have passed through the three types of flow paths merge in the gap 18, flow into the plurality of stator core inner ducts 23 formed in the stator core 21 from the gap 18, and the stator core 21 While cooling the stator windings 22, the stator core inner duct 23 passes radially outward and flows from the stator core 21 to the partition outer space 47c radially outward.

The cooling gas that has flown into the outer partition space 47c is divided into a coupling side and an anti-coupling side, and then flows out into the exhaust pipe 104 from the exhaust ports 49 formed in the respective bearing brackets 45.

FIG. 4 is a partial vertical cross-sectional view showing the configuration of the connection structure of the rotary electric machine. The connection structure 110 has a connection pipe 111 and a seal member 112.

One end of the connection pipe 111 is an air supply port 48f. The air supply port 48f is provided with a flange 111a and can be connected to the supply pipe 103. The connection pipe 111 is fixedly supported by the support member 113 in a state where the other end is inserted into the axial flow path 12 of the rotor shaft 11.

The seal member 112 is attached to the outer surface of the connection pipe 111 so as to close the space between the outer surface of the connection pipe 111 and the inner surface of the rotor shaft 11 on the axial flow path 12 side. The seal member 112 is, for example, packing or O-ring. For example, graphite or the like can be used as the material.

In the present embodiment configured as described above, the rotor shaft 11 of the rotary electric machine 150 is not provided with the internal fan, and the axial length of the rotary electric machine 150 is shortened as compared with the case where the internal fan is provided. be able to. Further, the rotary electric machine 150 is not provided with a cooler for cooling the cooling gas. Therefore, the rotary electric machine 150 can be significantly downsized.

Further, since the external cooler 101 and the fan 102 only have to respectively secure the cooling function and the air blowing function independently of the structure of the rotating electric machine 150, depending on the case, respective standard products or the like may be used. It will be possible.

Furthermore, since the rotary electric machine system 200 can be divided into the rotary electric machine 150 and the external cooling device 100, restrictions on the arrangement are reduced, and the number of cases where the rotary electric machine system 200 can be installed even in a narrower space than the conventional case increases.

As described above, according to the present embodiment, it is possible to reduce the size of the rotating electric machine and reduce the manufacturing cost.

[Third Embodiment]
FIG. 5 is a partial vertical cross-sectional view showing the configuration of the connection structure for the rotary electric machine according to the third embodiment. The third embodiment is a modification of the second embodiment. In the third embodiment, the rotary electric machine system 200 has a connection structure 120 instead of the connection structure 110 in the second embodiment. The other points are similar to those of the second embodiment.

The connection structure 120 includes a connection pipe 121, a sliding member 122, and a flexible member 123.

The connection pipe 121 is arranged such that the first end thereof is coaxial with the flexible member 123 and faces the flexible member 123. A flange 121a is provided at the second end of the flange 121a and can be connected to the supply pipe 103. The connecting pipe 121 is fixed and supported by the supporting member 125.

The sliding member 122 has an annular shape, and one surface thereof is in contact with the end surface of the rotor shaft 11. The other surface of the sliding member 122 is joined to the flexible member 123. As the sliding member 122, for example, graphite or the like can be used. The outer periphery of the sliding member 122 is supported by a supporting member 124 so as to be movable only in the axial direction.

The flexible member 123 is, for example, a metal bellows. The flexible member 123 is provided between the sliding member 122 and the connection pipe 121 facing the sliding member and is compressed in the axial direction. As a result, the flexible member 123 is supported by the connection pipe 121 and presses the sliding member 122 against the end surface of the rotor shaft 11.

In addition, in this embodiment. The axial flow path 12 does not necessarily have to be coaxial with the rotation center of the rotor shaft 11, and a plurality of axial flow paths 12 may be provided instead of one, and in that respect, the degree of freedom in designing as a rotary electric machine increases.

In the connection structure 120 of the present embodiment configured as described above, the sliding member 122 is removable, the state can be easily confirmed during inspection, and the sliding member 122 can be easily replaced. As a result, maintenance becomes easy.

[Other Embodiments]
Although the embodiments of the present invention have been described above, the embodiments are presented as examples and are not intended to limit the scope of the invention. For example, in the embodiment, the case of the fully-closed rotating electric machine has been described as an example, but the invention is not limited to the fully-closed type. That is, it may be an open type.

In the first embodiment, the case where the axial flow path 11b extending in the axial direction is formed between the rotor shaft 11 and the rotor core 15 has been described as an example. Even if the winding is provided, the axial flow passage 11b does not have to be provided when the rotor core does not need to be directly cooled, such as when the heat generated in the rotor is small. In this case, it is not necessary to form the rotor core inner duct 16 in the rotor core 15.

Furthermore, the embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. The embodiments and the modifications thereof are included in the invention described in the claims and equivalents thereof, as well as included in the scope and the gist of the invention.

10... Rotor, 11... Rotor shaft, 11a... Coupling part, 11b... Axial flow path, 12... Axial flow path, 13a... 1st branch flow path, 13b... 2nd branch flow path, 13c... Central branch flow Path, 15... Rotor core, 16... Rotor core inner duct (flow path), 17... Rotor winding, 17a, 17b... Connection part, 18... Air gap, 20... Stator, 21... Stator core, 22 ... Stator winding, 22a, 22b ... Connection part, 23 ... Stator core inner duct (flow path), 30 ... Bearing, 40 ... Frame, 42a ... First partition plate, 42b ... Second partition plate, 43a , 43b... Seal part, 45... Bearing bracket, 47... Closed space, 47a... Inner first space, 47b... Inner second space, 47c... Partition outer space, 48a, 48b... Air supply communication pipe (flow passage), 48c , 48d, 48f... Air inlet, 49... Outlet, 100... External cooling device, 101... External cooler, 102... Fan, 103... Supply pipe, 104... Exhaust pipe, 110... Connection structure, 111... Connection pipe, 111a... Flange, 112... Seal member, 113... Support member, 120... Connection structure, 121... Connection pipe, 121a... Flange, 122... Sliding member, 123... Flexible member, 124, 125... Support member, 150... Rotation Electric machine, 200... Rotating electric machine system

Claims (6)

Rotation having a rotor shaft extending in the axial direction and rotatably supported, and a rotor core mounted radially outside the rotor shaft and having radial passages formed at intervals in the axial direction With a child
A cylindrical stator core provided radially outside the rotor core and having a radial flow path formed at a distance in the axial direction, and penetrates the inside of the stator core in the axial direction. A stator having stator windings to which the axial outer portions of the stator core are respectively connected;
A frame arranged radially outside the stator to accommodate the rotor core and the stator;
Two bearings that support the rotor shaft on both sides of the rotor shaft in the axial direction with the rotor core interposed therebetween;
Two bearing brackets that fixedly support the two bearings and connect to the axial ends of the frame to form a closed space together with the frame;
A first partition plate that divides a part of the closed space together with the axial end portion of the stator core to accommodate the connection portions of the stator windings and form an inner first space and an inner second space, respectively. And a second partition plate,
A rotating electric machine comprising:
An air supply port for receiving the cooled cooling gas into the closed space is formed,
A flow path for communication from the air supply port to each of the inner first space and the inner second space is formed,
An outlet is formed for discharging the cooling gas from the closed space,
A rotating electric machine characterized by the above. The rotating electrical machine according to claim 1, wherein the communication-class flow path, and having a feed Killen pipe.
The rotor shaft includes
An axial flow path for passing the cooling gas received,
A first branch flow path and a second branch flow path that respectively communicate from the axial flow path to the inner first space and the inner second space;
A central branch flow passage that communicates with the rotor core from the axial flow passage,
Has been formed,
The rotor shaft further has a connection structure for connecting the first end of the rotor shaft and a supply pipe of the external cooling device in order to receive the cooling gas from the external cooling device.
The rotary electric machine according to claim 1, wherein The connection structure is
One end of the rotor shaft is inserted into the axial flow path of the rotor shaft at a first end of the rotor shaft, and the other end of the connection pipe is formed so as to be connectable to the supply pipe and statically supported.
A seal member attached to the outer surface of the connection pipe so as to close the space between the outer surface of the connection pipe and the inner surface of the rotor shaft,
The rotating electric machine according to claim 3, further comprising: The connection structure is
An annular sliding member, which is arranged so as to come into contact with the end surface of the rotor shaft at the first end portion of the rotor shaft and is statically supported,
The first end of the connection is opposed to the slide member with a gap from the slide member, and the second end of the connection is formed so as to be connectable to the supply pipe and is supported stationary coaxially with the rotor shaft. With a tube,
A flexible member coaxially attached to the tip of the first end of the connecting pipe so as to press the sliding member against the first end of the rotor shaft;
The rotating electric machine according to claim 3, further comprising: A rotating electric machine according to any one of claims 1 to 5,
An external cooling device for cooling the cooling gas of the rotating electric machine,
Equipped with,
The external cooling device is
An external cooler,
A fan that drives the cooling gas circulated in the external cooler and the rotating electric machine;
A supply pipe for guiding the cooling gas cooled by the external cooler to the rotating electric machine,
An exhaust pipe for guiding the cooling gas discharged from the rotating electric machine to the external cooler,
A rotating electrical machine system comprising:

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