JP2019103275A - Rotary electric machine and rotary electric machine system - Google Patents

Abstract

To provide a rotary electric machine which requires cooling, capable of reducing the size and the cost.SOLUTION: A rotary electric machine 150 comprises: a rotator 10 having a rotor iron core 15 in which a rotor shaft 11 and a flow channel 16 in a radial direction are formed; a stator 20 having a stator iron core 21 and a stator winding 22 in which the a flow channel 23 in the radial direction is formed; a frame 40; a bearing 30; a bearing bracket 45; and a first separation board 42a and a second separation board 42b each housing wire connection parts 22a and 22b of the stator winding 22 by dividing a part of a close space 47 with an axial direction end part of the stator iron core 21, and each forming an inner side first space 47a and an inner side second space 47b. In the rotary electric machine 150, air supply ports 48c and 48d receiving a cooling air cooled and an exhaust port 49 are formed, flow channels 48a and 48b for the communication reached to each of the inner side first space 47a and the inner side second space 47b from the air supply ports 48c and 48d are formed.SELECTED DRAWING: Figure 1

Description

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

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

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

Japanese Patent Application Laid-Open No. 57-189548 Japanese Patent Application Laid-Open No. 64-35339

  In the cooling unit, since the cooling efficiency is better than the cooling by the outside air, the cooling by the water cooler is often performed. The use of a water cooler has the advantage of less noise because it does not require an external fan, but it requires a large and expensive cooling unit compared to cooling by the outside air. Further, when the cooling water leaks from the water cooler, for example, there is a risk that a ground fault or the like of the rotating electrical machine may occur, and it is necessary to provide a reliable leak detection device (see Patent Documents 1 and 2).

  Then, an object of the present invention is to achieve downsizing and cost reduction of a rotating electrical machine requiring cooling.

  In order to achieve the above-mentioned object, the present invention provides an axially extending and rotatably supported rotor shaft, and an axially spaced radial flow attached to the radially outer side of the rotor shaft. A rotor having a rotor core on which a path is formed; and a cylindrical stator core provided radially outward of the rotor core and having a radial flow path formed at intervals in the axial direction. A stator having a stator winding which penetrates the inside of the stator core in the axial direction and the axial outer portions of the stator core are respectively connected, and a stator outer side of the stator in the radial direction A frame that is disposed 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 across the rotor core, and the two bearings Fix each bearing Two bearing brackets connected to the axial end of the frame and forming a closed space with the frame, and a part of the closed space with the axial end of the stator core divided A rotary electric machine comprising: a first partition plate and a second partition plate that respectively accommodate the axial outer connection portions of the stator winding and form an inner first space and an inner second space; An air supply port for receiving the cooled cooling gas into the closed space, and a flow path for communication from the air supply port to each of the inner first space and the inner second space; An outlet for discharging the cooling gas from the closed space is formed.

  A rotating electrical machine system according to the present invention includes the rotating electrical machine according to the above-described embodiment and an external cooling device for cooling a gas for cooling the rotating electrical machine, the external cooling device being an external cooler, and An external cooler, a fan for driving the cooling gas to be circulated in the rotating electric machine, a supply pipe for leading the cooling gas cooled by the external cooler to the rotating electric machine, and a discharge from the rotating electric machine And exhaust piping for leading the cooling gas to the external cooler.

  According to the present invention, downsizing and cost reduction of a rotating electrical machine requiring cooling can be achieved.

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

  Hereinafter, a rotating electrical machine and a rotating electrical machine system according to an embodiment of the present invention will be described with reference to the drawings. Here, parts that are the same as or similar to each other are given the same reference numerals, and duplicate explanations are omitted.

First Embodiment
FIG. 1 is a longitudinal sectional view showing the configuration of the rotary electric machine system according to the first embodiment. The rotating electrical machine system 200 includes a rotating electrical machine 150 and an external cooling device 100.

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

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

  The rotor shaft 11 is rotatably supported by bearings 30 at both axial outer sides of the rotor core 15. Although one end (first end) of the rotor shaft 11 is not provided with a coupling part, the other end (second end) has a coupling object, that is, the rotating electric machine 150 is an electric motor. In the case where the rotary electric machine 150 is a generator, it is a prime mover, but a coupling portion 11a for coupling with the coupling object is provided. Hereinafter, in the rotary electric machine 150, the side on which the coupling portion 11a is provided is referred to as the coupling side, and the opposite side is referred to as the non-coupling side.

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

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

  Rotor winding 17 is connected to each other on the outside on the side opposite to the axial direction of rotor core 15 at the non-coupling side and at the outside on the coupling side, or 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 on the radially outer side of the rotor core 15 via the air gap 18 and has a cylindrical shape. The stator core 21 is provided with a plurality of stator core inner ducts 23 which are radial flow paths spaced from each other along the axial direction. The stator core inner duct 23 is a flow path that leads from the radially inner side to the radial direction outer side of the stator core 21.

  The radially inner surface of the stator core 21 is formed with a plurality of slots (not shown) axially penetrating the stator core 21 at intervals in the circumferential direction.

  The stator winding 22 passes through the plurality of slots, and is connected to each other or connected to the outside on the outside on the side opposite to the axial end of the stator core 21 and the outside on the side of the joint. Connection 22a and connection 22b.

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

  The frame 40 and the two bearing brackets 45 together form a closed space 47. In the frame 40, air supply ports 48c, 48d for receiving the cooling gas cooled from the outside are formed. Here, the air supply ports 48 c and 48 d may be provided in either or both of the bearing brackets 45. Further, in each of the two bearing brackets 45, an exhaust port 49 for exhausting the cooling gas in the rotary electric machine 150 is formed. The discharge port 49 may be present only in any one of the bearing brackets 45. Alternatively, the frame 40 may be formed.

  In the closed space 47, a first partition plate 42a and a second partition plate 42b are provided.

  The first partition plate 42 a surrounds the connection 17 a on the non-coupling side of the rotor winding 17 and the connection 22 a on the non-connection side of the stator winding 22. The first partition plate 42 a is rotationally symmetric and has a shape in which one of the axial directions is open, and the open end is coupled to the axial end of the stator core 21. Together with the axial end, an inner first space 47a is formed. 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 the air supply communication pipe 48a. Communicate with each other.

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

  The second partition plate 42 b surrounds the connecting portion 17 b on the coupling side of the rotor winding 17 and the connecting portion 22 b on the coupling side of the stator winding 22. The shape of the second partition plate 42b is the same as the shape of the first partition plate 42a, and together with the axial end of the stator core 21, form an inner second space 47b. A cylindrical seal portion 43 b is formed in the penetrating portion of the rotor shaft 11. As a result, the second partition plate 42 b forms an inner second space 47 b in the closed space 47. An air supply communication pipe 48b, which is a flow passage 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 the air supply communication pipe 48b. Communicate with each other.

  The first partition 42 a and the second partition 42 b may each be a split structure that can be combined to surround and attach the rotor shaft 11.

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

  The seal portions 43a and 43b are not simply cylindrical but, for example, have a labyrinth structure that divides the space between the rotor shaft 11 and the rotor shaft 11 in the axial direction together with the rotor shaft 11, etc. A structure for suppressing leakage from the space 47a to the partition outside space 47c and leakage from the inner second space 47b to the partition outside space 47c as much as possible 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 a cooling gas which is a cooling gas in the rotary 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 noncontact heat exchanger or a contact heat exchanger. Depending on the installation location, appropriate ones can be used. Also, in some cases, it may be a normal commercial product.

  The fan 102 circulates a cooling gas between the rotating electrical machine 150 and the external cooler 101. Further, although the number of fans is one in FIG. 1, it may be two or more.

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

  Although FIG. 1 shows the case where the fan 102 is upstream of the external cooler 101, the fan 102 may be 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. Arrows in FIG. 1 indicate 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 rotary electric machine 150 first enters the air supply port 48c formed in the frame 40 from the supply pipe 103, and passes through the air supply communication pipe 48a communicated with the inside to form the first inner 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 non-coupling side of the rotor winding 17 and the connection portion 22a on the coupling side of the stator winding 22. And flows into the space 18 between the axial flow passage 11 b formed in the rotor shaft 11 and 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 in communication with the air supply port 48d. The cooling gas that has flowed out into the inner second space 47b passes through the inner second space 47b while cooling the connection portion 17b on the connection side of the rotor winding 17 and the connection portion 22b on the connection side of the stator winding 22. And flows into the space 18 between the axial flow passage 11 b formed in the rotor shaft 11 and the rotor core 15 and the stator core 21.

  The cooling gas that has flowed into the axial flow passage 11 b is sequentially divided at the portion where the rotor core intra-core duct 16 is provided, and flows into the rotor core intra-core duct 16. The cooling gas flowing into each of the plurality of rotor core intra-core ducts 16 passes the rotor core intra-core duct 16 radially outward while cooling the rotor core 15 and the rotor winding 17, and the rotor The iron core 15 flows out into the air gap 18.

  The cooling gas having flowed into the air gap 18 flows from the air gap 18 into the plurality of stator core intra-core ducts 23 formed in the stator core 21 to cool the stator core 21 and the stator winding 22, The air passes through the core duct 23 radially outward, and flows out of the stator core 21 into the radially outer partition space 47 c.

  The cooling gas that has flowed out to the partition external space 47 c is divided into the coupled side and the non-coupled side, and then flows out to the exhaust pipe 104 from the exhaust port 49 formed in each of the bearing brackets 45. The cooling gas that has flowed out to the exhaust pipe 104 is again sent to the external cooler 101 by the fan 102.

  In the present embodiment configured as described above, the inner shaft is not provided on the rotor shaft 11 of the rotary electric machine 150, and the axial length of the rotary electric machine 150 is reduced compared to the case where the inner fan is provided. be able to. Further, the rotary electric machine 150 is not provided with a cooler for cooling the cooling gas. For this reason, the rotary electric machine 150 can be miniaturized significantly.

  In addition, since the external cooler 101 and the fan 102 only need to secure the cooling function and the air blowing function independently of the structure of the rotary electric machine 150, depending on the case, it may be possible to use respective standard products etc. It becomes possible.

  Furthermore, since the rotary electric machine system 200 can be divided into the rotary electric machine 150 and the external cooling device 100, the restriction on the arrangement is reduced, and there are more cases that can be installed even in a place narrower than the conventional case.

  As described above, according to the present embodiment, downsizing of the rotating electrical machine and cost reduction of manufacturing can be achieved.

Second Embodiment
FIG. 2 is a longitudinal 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 of the rotor shaft 11 on the non-coupling side. . The supply pipe 103 is connected to the connection structure 110. As a result, the air supply port and the flow path for communication are different from those in the first embodiment. The other points are the same as in the first embodiment.

  FIG. 3 is a longitudinal cross-sectional view showing the configuration of a portion related to cooling in the rotating electrical machine. Arrows in FIG. 3 indicate the flow direction of the cooling gas. The connection structure 110 in which the air supply port is formed will be described later with reference to FIG.

  In the rotor shaft 11, an axial flow passage 12 axially extending from the end on the opposite side to the middle of the rotor shaft 11 is formed at a position of axial center inside the rotor shaft 11. A plurality of flow paths are branched from the axial flow path 12. Specifically, the first branch flow channel 13a communicating with the axial first flow channel 12 to the inner first space 47a, the second branch flow channel 13b communicating with the axial flow channel 12 to the inner second space 47b, and the axial direction A central branch flow channel 13 c communicating with the flow passage 12 and the inner duct 16 of the rotor core is formed.

  The first branch flow channel 13a and the second branch flow channel 13b are at least one in the axial direction, and the central branch flow channel 13c is at the axial position where the rotor core intra-core ducts 16 are provided in the axial direction. It is provided correspondingly.

  The first branch flow channel 13a, the second branch flow channel 13b, and the central branch flow channel 13c are through holes extending from the axial flow channel 12 to the surface of the rotor shaft 11, respectively, and circumferentially at the same axial position. At least one is formed in Further, a plurality of these may be provided at intervals in the circumferential direction at one axial position.

  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 47 a and the inner second space 47 b is in the rotor shaft 11. It is formed.

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

  The cooling gas flowing into the rotary electric machine 150 first flows from the supply pipe 103 through the connection structure 110 into the axial flow passage 12 formed in the rotor shaft 11. The cooling gas having flowed into the axial flow passage 12 sequentially branches into 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 into the first branch flow channel 13 a flows out of the rotor shaft 11 into the inner first space 47 a. The cooling gas that has flowed out into the inner first space 47 a cools the wiring portion 17 a on the non-coupling side of the rotor winding 17 and the wiring portion 22 a on the non-coupling side of the stator winding 22 while cooling the inner first space 47 a. And flow into the air gap 18.

  The cooling gas branched into the central branch flow path 13 c flows from the rotor shaft 11 into a plurality of rotor core inner-core ducts 16 formed in the rotor core 15. The cooling gas flowing into each of the plurality of rotor core intra-core ducts 16 formed in the rotor core 15 radially cools the rotor core intra-core duct 16 while cooling the rotor core 15 and the rotor winding 17 It passes outward and flows out of the rotor core 15 into the air gap 18.

  The cooling gas branched into the second branch flow channel 13 b flows out of the rotor shaft 11 into the inner second space 47 b. The cooling gas that has flowed out into the inner second space 47b passes through the inner second space 47b while cooling the connection portion 17b on the connection side of the rotor winding 17 and the connection portion 22b on the connection side of the stator winding 22. Flow into the air gap 18.

  As described above, the cooling gases having passed through the three types of flow paths join at the air gap 18 and flow from the air gap 18 into the plurality of stator iron core ducts 23 formed in the stator iron core 21. And while cooling the stator winding 22, it passes through the stator core inner duct 23 radially outward, and flows out from the stator core 21 to the radially outer partition outside space 47c.

  The cooling gas that has flowed out to the partition external space 47 c is divided into the coupled side and the non-coupled side, and then flows out to the exhaust pipe 104 from the exhaust port 49 formed in each of the bearing brackets 45.

  FIG. 4 is a partial longitudinal sectional view showing the configuration of the connection structure of the rotating electrical 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 48 f. The air supply port 48 f is provided with a flange 111 a and can be connected to the supply pipe 103. The connection pipe 111 is fixed and 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 a gap between the outer surface of the connection pipe 111 and the inner surface on the axial flow passage 12 side of the rotor shaft 11. The seal member 112 is, for example, a packing, an O-ring, or the like. As a material, for example, graphite can be used.

  In the present embodiment configured as described above, the inner shaft is not provided on the rotor shaft 11 of the rotary electric machine 150, and the axial length of the rotary electric machine 150 is reduced compared to the case where the inner fan is provided. be able to. Further, the rotary electric machine 150 is not provided with a cooler for cooling the cooling gas. For this reason, the rotary electric machine 150 can be miniaturized significantly.

  In addition, since the external cooler 101 and the fan 102 only need to secure the cooling function and the air blowing function independently of the structure of the rotary electric machine 150, depending on the case, it may be possible to use respective standard products etc. It becomes possible.

  Furthermore, since the rotary electric machine system 200 can be divided into the rotary electric machine 150 and the external cooling device 100, the restriction on the arrangement is reduced, and there are more cases that can be installed even in a place narrower than the conventional case.

  As described above, according to the present embodiment, downsizing of the rotating electrical machine and cost reduction of manufacturing can be achieved.

Third Embodiment
FIG. 5 is a partial longitudinal sectional view showing the configuration of the connection structure of the rotating electrical 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 the same as in the second embodiment.

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

  The connecting pipe 121 is disposed such that its first end faces the flexible member 123 coaxially with the flexible member 123. Further, a flange 121 a is provided at the second end, and can be connected to the supply pipe 103. The connection pipe 121 is fixed and supported by a support member 125.

  The slide member 122 is annular, and one surface is in contact with the end surface of the rotor shaft 11. The other surface of the slide member 122 is coupled to the flexible member 123. For example, graphite can be used as the sliding member 122. The sliding member 122 is supported by the supporting member 124 so as to be movable only in the axial direction on the outer periphery.

  The flexible member 123 is, for example, a metal bellows. The flexible member 123 is provided between the slide member 122 and the connection pipe 121 opposed to the slide member, in a state of being compressed in the axial direction. As a result, the flexible member 123 is supported by the connection pipe 121 and presses the slide member 122 against the end face of the rotor shaft 11.

  In the present embodiment, The axial flow passage 12 does not necessarily have to be coaxial with the rotation center of the rotor shaft 11, and may be a plurality instead of one, and in that respect, the design freedom as a rotating electric machine is increased.

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

Other Embodiments
While 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 type rotating electric machine is shown as an example, but the present 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 passage 11b extending in the axial direction is formed between the rotor shaft 11 and the rotor core 11 is shown as an example in the surface of the rotor shaft 11. Even if the winding is provided, the axial flow passage 11b may not be provided if direct cooling of the rotor core portion is not necessary because heat generation in the rotor is small. In this case, it is not necessary to form the rotor inner core duct 16 in the rotor core 15.

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

  DESCRIPTION OF SYMBOLS 10 ... Rotor 11, 11 ... Rotor shaft, 11a ... Coupling part, 11b ... Axial direction flow path, 12 ... Axial direction flow path, 13a ... 1st branch flow path, 13b ... 2nd branch flow path, 13c ... Central branch flow Path 15 15 Rotor core, 16 Rotor core inner duct (flow path) 17 Rotor winding 17a, 17b Connection portion 18 Gap 20 Stator 21 Stator core 22 ... Stator winding, 22a, 22b ... Connection portion, 23 ... Stator core inner duct (flow path), 30 ... Bearing, 40 ... Frame, 42a ... First partition plate, 42b ... Second partition plate, 43a , 43b: seal portion, 45: bearing bracket, 47: closed space, 47a: inner first space, 47b: inner second space, 47c: partition external space, 48a, 48b: air supply communication pipe (flow path), 48c , 48d, 48f ... air supply port, 49 ... exhaust port, 100 ... outside Cooling device, 101: external cooler, 102: fan, 103: supply piping, 104: exhaust piping, 110: connection structure, 111: connection pipe, 111a: flange, 112: seal member, 113: support member, 120: connection Structure 121 121 connecting pipe 121a flange 122 sliding member 123 flexible member 124, 125 support member 150 rotating electric machine 200 rotating electric machine system

Claims (6)

A rotary shaft having an axially extending and rotatably supported rotor shaft, and a rotor core attached to the radially outer side of the rotor shaft and having the axially spaced apart radial flow paths. With the child,
A cylindrical stator core provided radially outward of the rotor core and having a radial flow path formed at intervals in the axial direction, and penetrates the inside of the stator core in the axial direction. A stator having a stator winding to which the axially outer portions of the stator core are respectively connected;
A frame disposed radially outward of the stator and housing the rotor core and the stator;
Two bearings for supporting the rotor shaft on both sides of the rotor shaft in the axial direction sandwiching the rotor core;
Two bearing brackets respectively fixedly supporting the two bearings and connected to the axial end of the frame and forming a closed space with the frame;
A part of the closed space is divided together with the axial end of the stator core, and the axially outer connection portions of the stator winding are accommodated to form an inner first space and an inner second space, respectively. A first partition plate and a second partition plate,
A rotating electric machine equipped with
An air inlet is formed to receive the cooled cooling gas into the closed space,
A flow passage for communication from the air supply port to each of the first inner space and the second inner space is formed,
An outlet for discharging the cooling gas from the closed space is formed.
A rotating electrical machine characterized by   The rotary electric machine according to claim 1, further comprising an air supply communication pipe extending from the air supply port to each of the inner first space and the inner second space as the flow path for communication. The rotor shaft is
An axial flow passage for passing the received cooling gas;
A first branch channel and a second branch channel respectively communicating with the inner first space and the inner second space from the axial channel;
A central branch channel communicating with the rotor core from the axial channel;
Is formed,
The rotor shaft further includes a connection structure connecting the first end of the rotor shaft and a supply pipe of the external cooling device to receive a cooling gas from the external cooling device.
The rotary electric machine according to claim 1, characterized in that: The connection structure is
A connecting pipe whose one end is inserted into the axial flow path of the rotor shaft at a first end of the rotor shaft, and whose other end is formed connectably with the supply pipe,
A seal member attached to the outer surface of the connecting pipe so as to close a gap between the outer surface of the connecting pipe and the inner surface of the rotor shaft;
The rotary electric machine according to claim 3, characterized in that: The connection structure is
An annular sliding member disposed in stationary contact with and supported at an end face of the rotor shaft at a first end of the rotor shaft;
A first end of the connection faces the slide member at a distance from the slide member, and a second end of the connection is formed so as to be connectable to the supply pipe and is coaxially supported coaxially with the rotor shaft. With the tube,
A flexible member coaxially mounted at the distal end of the first end of the connecting tube to press the sliding member against the first end of the rotor shaft;
The rotary electric machine according to claim 3, characterized in that: A rotating electrical machine according to any one of claims 1 to 5;
An external cooling device for cooling a cooling gas of the rotating electrical machine;
Equipped with
The external cooling device is
An external cooler,
A fan for driving the cooling gas circulated in the external cooler and the rotating electric machine;
Supply piping for guiding the cooling gas cooled by the external cooler to the rotating electrical machine;
An exhaust pipe for guiding the cooling gas discharged from the rotating electrical machine to the external cooler;
An electric rotating machine system comprising:

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