JP2016036234A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine which achieves downsizing and weight reduction of a stator frame by improving a cooler structure and arrangement of the rotary electric machine while maintaining the cooling performance and achieves low costs.SOLUTION: The rotary electric machine includes: a rotor core 9; a stator core 2; a stator frame 1; a rotor shaft 11; a bearing bracket 12; a bearing device 13; a cooling medium circulation passage 19; and coolers 14. The cooling medium circulation passage 19 has: air ducts 7 which are formed in the rotor core 9 and the stator core 2 and circulate the cooling medium; an outer periphery ventilation flue 19a provided along the stator frame 1; and both ends ventilation flues 19b1 and 19b2 formed between the bearing bracket 12 and a screen board 15. The coolers 14 are provided in the middle of the cooling medium circulation passage 19 and respectively installed at both ends ventilation flues 19b1, 19b2 in an oblique manner with respect to a direction perpendicular to the rotor shaft 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating electrical machine.

  Some rotary electric machines have a cooler disposed in a ventilation path through which a cooling medium for cooling the inside of the machine flows. As an example of a rotating electrical machine provided with a cooler for cooling the cooling medium, a cooling device and a ventilation path are provided above or below the rotating electrical machine, and the cooling medium whose temperature has been increased by heat generation in the rotating electrical machine is passed through the ventilation path. There is something that leads to a cooler to cool.

  Further, there has been proposed a plurality of coolers arranged in the circumferential direction at the same axial position between a stator core and a stator frame of a rotating electrical machine.

  In a rotating electrical machine having a cooler, the ventilation path serves to connect between the ventilation sections in the machine in order to distribute the cooling medium in the machine, and the cooling medium flows in the radial direction and the circumferential direction in the ventilation section. Yes.

  By the way, if there is a part in the rotating electrical machine where the flow of the cooling medium is hindered, the part may become locally hot and may be damaged. Therefore, it is necessary to arrange the ventilation path and the cooler so as not to disturb the flow of the cooling medium in the ventilation section.

  As an example of arranging a ventilation path and a cooler so as not to disturb the flow of the cooling medium in the ventilation section, a top dome type rotary electric machine provided with a cooler and a ventilation path above the rotary electric machine, or both sides of the rotary electric machine There are four vertical rotating electrical machines provided with a cooler and a ventilation path.

  In a rotating electrical machine, a rotor core with a rotor winding and a stator core with a stator winding are placed in a stator frame in a state of facing each other through an air gap. Has been. The stator core is provided with a plurality of ventilation ducts in the radial direction.

  In a top dome type rotating electrical machine, two coolers are provided in the axial direction on the rotating electrical machine. Two coolers are provided in series upstream and downstream of one flow path. Then, the cooling medium sealed in the stator frame is passed through the stator core and the rotor core, which are heat sources, to cool the stator core and the rotor core. The cooling medium heated by heat exchange with the stator core, the rotor core, etc. is cooled by a cooler provided at two locations in the upper part of the rotating electrical machine and in the axial direction, and then again through the ventilation passage, the stator core And it is sent to the rotor iron core.

  Further, in the four-vertical rotating electric machine, four coolers are provided on both sides of the rotating electric machine. Four coolers are provided independently in each flow path, and each cooler has a parallel structure. The cooling medium heated by cooling the stator core and the rotor core is cooled by four coolers provided on both sides of the rotating electrical machine, and then again through the ventilation path, the stator core and the rotor core. I send it to etc.

  In recent years, large-capacity rotating electrical machines have been manufactured by adopting a water-cooling rotating electrical machine in which a stator winding is cooled with water and a stator iron core is cooled with hydrogen. This method is inferior in efficiency to the indirect hydrogen cooling method (a method in which the stator winding and the stator core are cooled with hydrogen) adopted in a rotating electric machine having a smaller output. Therefore, it is required to expand the corresponding output range of rotating electrical machines that employ the indirect hydrogen cooling method.

International Publication No. 01/018943 Pamphlet JP 2007-282366 A

  However, when the indirect hydrogen cooling method is applied to a large capacity rotating electrical machine, the outer diameter of the stator core is larger than that of the water cooler. Therefore, when the cooler and the ventilation path are provided on both sides of the rotating electric machine as in the above-described four-vertical rotating electric machine, the width of the rotating electric machine increases, resulting in disadvantages such as an increase in cost and an increase in transportation costs. . In addition, when a configuration in which a cooler and a ventilation path are provided above as in the above-described top dome type rotating electrical machine, an increase in the width of the rotating electrical machine can be suppressed, but the cooler can be connected in series to the cooling medium. For this reason, it is difficult to use the cooler effectively, and there are disadvantages such as large windage loss. Since the size of the rotating electrical machine is related to transportation restrictions, it is desirable that the rotating electrical machine be as small and light as possible.

  The problem of the embodiment is to provide a rotating electrical machine in which the stator frame is reduced in size and weight by improving the cooler structure and arrangement of the rotating electrical machine while maintaining the cooling capacity, thereby reducing the cost.

  According to the embodiment, the rotation includes a rotor core, a stator core, a stator frame, a rotor shaft, a closing member, a bearing device, a flow path for a cooling medium, and a cooler. Electric. A cooling medium flow passage is formed in the rotor core and the rotor core, and has an internal flow path for circulating a cooling medium for cooling the inside of the machine, along the stator frame in the axial direction of the stator core. Formed between the outer peripheral ventilation path provided along the outer periphery and the partition member provided to be separated from the inner side of the closure member, and the outer peripheral ventilation path and the end at the axial ends of the stator frame. It has a both-ends ventilation path which connects between air gaps. The cooler is provided in the middle of the flow path of the cooling medium, and is installed obliquely with respect to the direction perpendicular to the rotor axis in the both-end air passages.

The longitudinal cross-sectional view which shows the schematic structure of the whole turbine generator of 1st Embodiment. II-II sectional view taken on the line of FIG. The side view which shows the cooling piping structure of the cooler of 1st Embodiment in a partial cross section. The perspective view which shows the cooling water path | route of the cooler by 2nd Embodiment. The perspective view which shows the thin-plate structure of the cooler by 3rd Embodiment. The perspective view which shows the cooling water path | route of the cooler by 4th Embodiment. The side view for showing the guide vane in the both-ends ventilation path in a 5th embodiment. The side view for showing the arrangement | positioning state of the cooler in the both-ends ventilation path in 6th Embodiment.

[First Embodiment]
(Constitution)
1 to 3 show a first embodiment. FIG. 1 is a longitudinal sectional view showing a schematic configuration of an entire turbine generator as an example of the rotating electrical machine according to the first embodiment. The turbine generator of the present embodiment is a hermetic type in which the inside of the machine is cooled by a cooling medium such as hydrogen enclosed in the machine.

  In FIG. 1, reference numeral 1 denotes a cylindrical stator frame constituting a casing of a rotating electrical machine. A cylindrical stator (stator) iron core 2 is provided inside the stator frame 1. A plurality of axially continuous slots 5 are formed in the inner peripheral portion of the stator core 2 at predetermined intervals in the circumferential direction. A stator winding 6 is accommodated in the slot 5. The stator core 2 is formed with a radial flow type internal flow path in which a plurality of ventilation ducts 7 extending radially in the radial direction are formed at equal intervals in the axial direction. The arrangement of the ventilation duct 7 may be unequal.

  As shown in FIG. 2, a rotor (rotor) core 9 is disposed on the inner peripheral side of the stator core 2 via a gas gap 8. A plurality of slots (not shown) continuous in the axial direction are formed on the outer peripheral portion of the rotor core 9 at predetermined intervals in the circumferential direction. A rotor winding (not shown) is accommodated in the slot of the rotor core 9. Cylindrical retaining rings 10 that press both ends of the rotor winding are provided at both ends of the rotor core 9. On the central axis of the rotor core 9, a rotor shaft 11 that extends toward both ends in the axial direction is provided integrally with the rotor core 9.

  Bearing brackets 12, which are annular closing members, are provided at both axial ends of the stator frame 1. A bearing device 13 that rotatably supports the rotor shaft 11 is provided on the inner peripheral side of the bearing bracket 12. At one end of the rotor shaft 11 (outside of the bearing device 13), a current collector 20 that supplies power to the rotating rotor winding is provided. The current collecting device 20 is configured to electrically connect the fixed side and the rotating side by pressing a carbon brush against a current collecting ring provided at one end of the rotor shaft 11 (outside the bearing device 13). It is. At the other end of the rotor shaft 11 (outside the bearing device 13), a connecting portion with a turbine that is a rotation source of the rotating electrical machine is formed.

  Further, an outer peripheral ventilation path 19 a is provided along the stator frame 1 along the axial direction of the stator core 2 at the outer peripheral portion of the stator frame 1. Further, a partition plate 15 is provided inside the stator frame 1 so as to be separated from the inside of the bearing bracket 12. At both ends in the axial direction of the stator frame 1, both-end air passages 19 b 1 and 19 b 2 are formed between the bearing bracket 12 and the partition plate 15, respectively.

  The rotor shaft 11 is provided with an axial fan 17 outside the retaining rings 10 on both sides. A fan nozzle ring 18 is attached to the end of the partition plate 15 on the hollow portion side. The fan nozzle ring 18 is curved from the end on the hollow portion side of the partition plate 15 toward the axial center of the stator core 2 to form a throttle shape. The curved portion of the fan nozzle ring 18 is disposed so as to pass near the tip of the axial fan 17 viewed from the rotor shaft 11.

  When the rotor shaft 11 rotates, the cooling medium sealed in the machine is pressurized by the rotation of the axial fan 17 and circulates in the machine. At this time, the discharge air from the axial fan 17 flows in the gas gap 8 from the outside toward the inside along the axial direction of the rotor shaft 11. Further, the gas flows from the gas gap 8 through the ventilation duct 7 of the stator core 2 to the outer peripheral ventilation path 19a side of the stator core 2. Subsequently, a cooling medium flow passage 19 that flows from both sides of the outer ventilation passage 19a through the both-end ventilation passages 19b1 and 19b2 to the axial flow fan 17 side is formed. A ventilation duct (not shown) is also formed on the rotor core 9 side, and the cooling medium enclosed in the machine circulates also on the rotor core 9 side by the rotation of the axial fan 17.

  Further, in the present embodiment, a cooler 14 for cooling the cooling medium is provided in the both-end ventilation paths 19b1 and 19b2 in the middle of the cooling medium flow path 19. FIG. 3 is a side view showing a cooling pipe structure of the cooler 14 with a partial cross section. The main body 14a of the cooler 14 includes a heat exchanging unit 31, a first cooling water box 23a, and a second cooling water box 23b. The heat exchange unit 31 includes a plurality of cooling pipes 21 and a plurality of thin plate-like fins 22.

  The plurality of cooling pipes 21 are water supply pipes that are arranged in parallel and pass cooling water for cooling the cooling medium. The plurality of thin plate-like fins 22 are mounted side by side in the axial direction of the pipe 21 at a predetermined interval and spread in the radial direction of the cooling pipe 21. The first cooling water box 23 a is disposed on one end side of the heat exchange unit 31 and communicates with each cooling pipe 21. The second cooling water box 23 b is disposed on the other end side of the heat exchanging portion 31, communicates with each cooling pipe 21, and has a cooling water inlet portion 32 and a cooling water outlet portion 33. Then, in the cooler 14, the cooling water enters the cooling pipe 21 from the cooling water inlet portion 32 of the second cooling water box 23b, reverses in the first cooling water box 23a, enters the cooling pipe 21, and is cooled. Return to the water outlet 33.

  Moreover, in this Embodiment, as shown in FIG. 1, the cooler 14 is each installed in the connection part with the outer periphery ventilation path 19a in the both-end ventilation path 19b1 and 19b2 diagonally with respect to the direction orthogonal to the rotor axis | shaft 11. Has been. Thereby, the flow path of the cooling gas 16 cooled by the cooler 14 is formed in the rotating electrical machine along the direction from the cooler 14 toward the rotor core 9.

(Action / Effect)
According to the turbine generator of the present embodiment, the cooler 14 is installed in the both-end ventilation paths 19b1 and 19b2 between the bearing bracket 12 and the partition plate 15, thereby effectively using the radial ventilation path. This makes it possible to reduce the size of the generator. Therefore, since it is not influenced by the increase in the outer diameter of the stator core 2, even a large-capacity rotating electrical machine is a rotating electrical machine that is smaller and lighter than the conventional one.

  Furthermore, by installing the cooler 14 obliquely at a location where the flow path changes from the outer peripheral ventilation path 19a in which the cooling medium flows in the axial direction to the both-end ventilation paths 19b1 and 19b2 in which the cooling medium flows in the radial direction, the wind loss is reduced. The above-described downsizing and weight reduction can be achieved while maintaining the cooling capacity. According to the present embodiment, since the cooler 14 can effectively use the radial air passages in the both-end air passages 19b1 and 19b2, a linear cooler as shown in FIG. It is good also as a structure which has arrange | positioned the cooler of shape, such as a letter shape or an arch shape.

[Second Embodiment]
(Constitution)
FIG. 4 shows a second embodiment. The present embodiment is a modification in which the configuration of the turbine generator of the first embodiment (see FIGS. 1 to 3) is changed as follows. 4 that are the same as those in FIGS. 1 to 3 are marked with the same symbols and descriptions of them will be omitted.

  In the present embodiment, the cooler 14 includes a temperature distribution adjusting unit 41 that equalizes the flow of the cooling medium flowing through the heat exchange unit 31 and the temperature distribution. In the temperature distribution adjusting means 41 of the present embodiment, the cooling water inlet portion 32 to the cooler 14 is provided on the side where the cooling medium flow rate is large (the inner diameter side or the outer diameter side) in the both-end ventilation paths 19b1 and 19b2. Is. In FIG. 4, the solid line arrows indicate the ventilation amount of the cooling medium in the both-end ventilation paths 19 b 1 and 19 b 2.

(Action / Effect)
In the present embodiment, as shown in FIG. 1, the cooler 14 is disposed at the connecting portion of the both-end ventilation passages 19b1 and 19b2 with the outer peripheral ventilation passage 19a, so that the cooling medium in the both-end ventilation passages 19b1 and 19b2 Ventilation is uneven. Therefore, by disposing the cooling water inlet 32 to the cooler 14 on the side where the cooling medium ventilation amount is large in the both-end ventilation paths 19b1 and 19b2, the ventilation volume (flow rate) of the cooling medium in the both-end ventilation paths 19b1 and 19b2. ) Cooler cooling water can be passed through the side with more.

  By adopting such a configuration of the present embodiment, it is possible to achieve the same effect as that of the first embodiment described above, and of course, the air flow rate of the cooler 14 with respect to the cooling medium whose flow is not uniformized. Efficient cooling can be performed by passing cooler cooling water through the higher side.

[Third Embodiment]
(Constitution)
FIG. 5 shows a third embodiment. The present embodiment is a modification in which the configuration of the turbine generator of the first embodiment (see FIGS. 1 to 3) is changed as follows. 5, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted.

  In the present embodiment, the fin pitch between the fins 22 is changed in the heat exchanging portion 31 of the cooler 14, and the first region 42 where the fin pitch between the fins 22 is smaller and the fin pitch between the fins 22 is larger. The second region 43 is provided. Then, as the temperature distribution adjusting means 41, the first region 42 is arranged on the side where the flow rate of the cooling medium flowing through the heat exchanging section 31 is large.

(Action / Effect)
In the cooler 14 of the present embodiment, the thin plate-like fins 22 that extend in the radial direction on the cooling pipe 21 are arranged in parallel in the axial direction of the pipe 21 at predetermined intervals as described above. The cooling medium in the rotating electrical machine is cooled by flowing between the thin plate-like fins 22. According to the present embodiment, the cooling medium flowing non-uniformly from the ventilation path 19 to the cooler 14 can be rectified by changing the interval between the thin plate-like fins 22. In the present embodiment, since the first region 42 is arranged on the side where the flow rate of the cooling medium flowing through the heat exchanging section 31 is large as the temperature distribution adjusting means 41, the flow of the cooling medium after passing through the cooler 14 is changed. The temperature distribution can be made uniform. Therefore, the cooling efficiency in the rotating electrical machine can be improved, and the efficiency of the entire rotating electrical machine can be improved.

[Fourth Embodiment]
(Constitution)
FIG. 6 shows a fourth embodiment. The present embodiment is a modification in which the configuration of the turbine generator of the first embodiment (see FIGS. 1 to 3) is changed as follows. In FIG. 6, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted.

  In the present embodiment, the arrangement and the number of the cooling pipes 21 are changed between the forward path and the return path of the cooling water in the cooler 14 in the heat exchanging section 31 of the cooler 14. That is, the heat exchange part 31 of the cooler 14 is provided with a first region 44 having a larger number of arranged cooling pipes 21 and a second region 45 having a smaller number of arranged cooling pipes 21. Then, as the temperature distribution adjusting means 41, the first region 44 is arranged on the side where the flow rate of the cooling medium flowing through the heat exchanging section 31 is large.

(Action / Effect)
As described above, the cooler 14 according to the present embodiment increases or decreases the arrangement and number of the cooling pipes 21 in the cooler 14, thereby reducing the cooling medium that flows non-uniformly from the ventilation path 19 to the cooler 14. Can be rectified. Further, since the first region 44 is arranged as the temperature distribution adjusting means 41 on the side where the flow rate of the cooling medium flowing through the heat exchanging section 31 is large, the temperature distribution of the flow of the cooling medium after passing through the cooler 14 is made uniform. can do. Therefore, the cooling efficiency in the rotating electrical machine can be improved, and the efficiency of the entire rotating electrical machine can be improved.
be able to.

[Fifth Embodiment]
(Constitution)
FIG. 7 shows a fifth embodiment. The present embodiment is a modification in which the configuration of the turbine generator of the first embodiment (see FIGS. 1 to 3) is changed as follows. In FIG. 7, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted.

  In the turbine generator of the present embodiment, a plurality of guide vanes 24 that guide the ventilation of the cooling medium are provided before and after the cooler 14 in the both-end ventilation paths 19b1 and 19b2. Each guide vane 24 has a shape that does not cause ventilation resistance. Flow distribution adjustment for uniformizing the non-uniform flow distribution flowing into the cooler 14 by providing a plurality of guide vanes 24 at equal intervals or non-uniform intervals along the direction orthogonal to the ventilation direction of the both-end ventilation paths 19b1, 19b2. The means 46 is comprised.

(Action / Effect)
In the present embodiment, the flow rate of the cooling medium flowing into and out of the cooler 14 is uniformly corrected by the guide vanes 24 in the circumferential direction of the bearing bracket 12. As described above, by providing the guide vanes 24 as in the present embodiment, the flow of the cooling medium from the ventilation path 19 is guided to the cooler 14, and the lengths and gaps are not evenly arranged by the guide vanes 24. The incoming cooling medium can be rectified. Further, a further rectifying effect can be expected by the guide vanes 24 downstream of the cooler 14, and the temperature distribution of the downstream of the cooler 14 can be made uniform, so that the cooling efficiency in the rotating electrical machine can be improved. Thus, the efficiency of the entire rotating electrical machine can be improved.

[Sixth Embodiment]
(Constitution)
FIG. 8 shows a fourth embodiment of the present invention. The present embodiment is a modification in which the configuration of the turbine generator of the first embodiment (see FIGS. 1 to 3) is changed as follows. In FIG. 8, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted.

  In the present embodiment, a plurality of coolers 14 are arranged in series on the upstream side and the downstream side of the ventilation in the both-end ventilation paths 19b1 and 19b2 between the bearing bracket 12 and the partition plate 15. In the present embodiment, an upstream side cooler 14b1 having a small capacity is disposed on the upstream side of the ventilation paths 19b1 and 19b2, and a downstream side cooler 14b2 having a large capacity is disposed on the downstream side. In addition, you may make it the structure by which the downstream cooler 14b2 with a large capacity | capacitance is arrange | positioned in the upstream of the ventilation path of both-end ventilation path 19b1, 19b2, and the upstream cooler 14b1 with a small capacity | capacitance is arrange | positioned downstream.

(Action / Effect)
In the present embodiment, the upstream-side cooler 14b1 and the downstream-side cooler 14b2 are installed in series on the both-end ventilation passages 19b1 and 19b2 between the bearing bracket 12 and the partition plate 15, thereby providing a radial ventilation passage. 19 can be used effectively. Further, the generator can be downsized by the serial arrangement of the upstream cooler 14b1 and the downstream cooler 14b2.
In the above embodiment, a configuration in which a radial flow type internal flow path is formed in the stator core 2 is shown, but a configuration in which a diagonal flow type internal flow path is formed in the stator core 2 is adopted. Also good.

  According to these embodiments, while maintaining the cooling capacity of the rotating electrical machine, a cooler is disposed without increasing the width or height of the rotating electrical machine, thereby obtaining a hydrogen indirect cooling type rotating electrical machine that is reduced in size and weight. It is possible to provide a rotating electrical machine that can be used.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

    DESCRIPTION OF SYMBOLS 1 ... Stator frame, 2 ... Stator iron core, 7 ... Ventilation duct (internal flow path), 8 ... Gas gap, 9 ... Rotor iron core, 10 ... Retaining ring, 11 ... Rotor shaft, 12 ... Bearing bracket ( (Blocking member), 13 ... bearing device, 14 ... cooler, 15 ... partition plate, 16 ... cooling gas, 17 ... axial fan, 18 ... fan nozzle ring, 19 ... flow passage, 19a ... outer peripheral ventilation path, 19b1, 19b2 ... Both ends ventilation path, 21 ... Cooling piping, 22 ... Fin, 23a ... First water box, 23b ... Second water box.

Claims (8)

A rotor core with a rotor winding;
A stator core disposed opposite to the rotor core via an air gap and provided with a stator winding;
A stator frame for storing these,
A rotor shaft provided integrally with the rotor core on the central axis of the rotor core and extending to both axial ends;
An annular closing member disposed at both axial ends of the stator frame;
A bearing device that is arranged on the inner peripheral side of the closing member and rotatably supports the rotor shaft;
An inner flow path formed inside the rotor core and the rotor core and through which a cooling medium for cooling the inside of the machine flows, and an outer draft provided along the stator frame along the axial direction of the stator core A passage, and a closing plate provided between the closing member and the inner side of the closing member, and communicates between the outer circumferential air passage and the air gap at both axial ends of the stator frame. A flow path of the cooling medium having both ends of the ventilation path,
A cooler that is provided in the middle of the flow path of the cooling medium and cools the cooling medium,
The rotating electric machine according to claim 1, wherein the coolers are respectively installed obliquely with respect to a direction perpendicular to the rotor axis in the both-end air passages. The cooler is
A plurality of cooling pipes that are arranged in parallel and that pass cooling water for cooling the cooling medium, and a plurality of thin plate-shaped pipes that are arranged in parallel in the axial direction of the pipe at predetermined intervals and spread in the radial direction of the cooling pipe. A heat exchanging section comprising fins,
A first cooling water box disposed on one end side of the heat exchanging portion and communicating with each cooling pipe;
A second cooling water box disposed on the other end side of the heat exchanging portion, communicating with each cooling pipe, and having a cooling water inlet portion and a cooling water outlet portion;
The rotating electrical machine according to claim 1, comprising:   The rotating electrical machine according to claim 2, wherein the cooler includes a temperature distribution adjusting unit that uniformizes a flow and a temperature distribution of the cooling medium flowing through the heat exchange unit.   4. The rotating electrical machine according to claim 3, wherein the temperature distribution adjusting unit has the cooling water inlet portion arranged on a side where a flow rate of the cooling medium flowing through the heat exchange portion is large. The temperature distribution adjusting means changes a fin pitch between the fins of the cooler, and includes a first region having a smaller fin pitch between the fins, and a second region having a larger fin pitch between the fins. , And
4. The rotating electrical machine according to claim 3, wherein the first region is arranged on a side where the flow rate of the cooling medium flowing through the heat exchange unit is large. The temperature distribution adjusting means increases or decreases the arrangement and number of the cooling pipes in the cooler,
A first region having a larger number of arrangements of the cooling pipes and a second region having a smaller number of arrangements of the cooling pipes,
4. The rotating electrical machine according to claim 3, wherein the first region is arranged on a side where the flow rate of the cooling medium flowing through the heat exchange unit is large. The both-end ventilation path has a shape that does not become ventilation resistance, and a guide vane that guides a cooling medium to the cooler is provided,
A flow distribution adjusting means for providing a uniform non-uniform flow distribution flowing into the cooler by providing a plurality of the guide vanes at equal intervals or non-uniform intervals along a direction orthogonal to the ventilation direction of the both-end ventilation paths; The rotating electrical machine according to claim 1, comprising:   The rotating electric machine according to any one of claims 1 to 7, wherein the both-end air passages are configured such that the coolers are installed in series on an upstream side and a downstream side in a ventilation direction.

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