WO2000055958A1

WO2000055958A1 - Dynamo-electric machine

Info

Publication number: WO2000055958A1
Application number: PCT/JP1999/001315
Authority: WO
Inventors: Hideaki Mori; Ryoichi Shiobara; Kenichi Hattori; Masayuki Kaiho; Akiyoshi Iida; Shigekazu Kieda; Toshio Ootaguro; Shingo Yokoyama
Original assignee: Hitachi, Ltd.
Priority date: 1999-03-17
Filing date: 1999-03-17
Publication date: 2000-09-21

Abstract

A dynamo-electric machine provided with a winding-carrying rotor in a winding slot, wherein axial flow passages in which a cooling fluid is made to flow axially to the portion of the rotor winding which is positioned on the inner side of a ring for retaining an end portion of the rotor winding are provided, the axial flow passages communicating with flow passages extending in the radial direction of the rotor winding, whereby a compact dynamo-electric machine capable of being manufactured inexpensively, obtaining a high reliability and increasing an output level can be attained.

Description

Specification

Rotating electrical machinery

The present invention relates to a rotating electric machine, and is particularly suitable for a large-capacity gas direct cooling type rotating electric machine, for example, a turbine generator. Background art

Generators, especially turbine generators, have a plurality of rotor windings and an axially formed winding slot in which the windings are arranged. The winding slots are provided on the outer peripheral surface of the rotor on both sides of the magnetic pole portion of the rotor body at intervals, and a plurality of rotor windings constituting the same magnetic pole are arranged concentrically around the magnetic pole. ing. This rotor winding is formed by stacking a plurality of winding conductors in the radial direction in a radial direction, and an insulating layer is provided between the turns. When an electric current is applied to the rotor winding from the outside, an electromagnetic field required for each magnetic pole is generated. The rotor winding is firmly edged inside the winding slot in the rotor so that the rotor winding is not jumped in the outer diameter direction of the winding due to the strong centrifugal force caused by the rotation of the rotor. The rotor is fixed and is held at the rotor end by a cylindrical holding ring provided so as to be in contact with the outer periphery of the winding.

When heat is applied to the rotor windings, joule heat is generated in the winding conductor. The insulation layer of the rotor winding is made of a material having high heat resistance such as force, but its heat resistance temperature is limited, and the higher the heat resistance temperature, the higher the cost. In addition, the thermal expansion of the wound conductor due to the temperature rise causes a large distortion to the wound wire and the rotor, which may cause rotational vibration. Therefore, as described in Japanese Patent Application Laid-Open No. Hei 9-285502, it has been devised to cool the rotor windings with a cooling fluid in a structure called a radial ventilation flow path cooling method. ing. In this cooling method, a sub-slot is provided at the bottom of the winding slot as a ventilation channel from the end of the winding, and a large number of rotor windings are secured while ensuring electrical insulation between the turns. A radial ventilation channel is provided.孔 A hole is also provided in the edge so that this flow path communicates with the outer diameter side of the rotor, forming a radial ventilation passage. This allows the cooling fluid to flow from the sub-slot to the radial flow path formed in the rotor winding, thereby forcibly cooling the rotor winding in the winding slot. It is common to use air or hydrogen as the cooling fluid.

On the other hand, the rotor winding of the winding end located inside the retaining ring is cooled by natural convection or thermosyphon. In this method, heat is removed by local flow generated due to the difference in density of the cooling fluid between the portion that receives heat from the rotor winding and the portion that does not.

However, in recent years, the heat load has increased due to the compactness of the entire generator, and the temperature of the entire rotor winding has increased. In addition, the thermosyphon heat transfer in the rotor winding at the winding end located inside the retaining ring increases the temperature of the rotor windings and causes the rotor windings to rotate with each other. As the distance between the cooling fluids becomes smaller, the cooling fluid flow caused by the density difference and centrifugal force becomes worse, and the cooling fluid flow becomes lower. As a result, the temperature at the end of the rotor winding and at the end of the winding slot is relatively higher than the temperature of the portion having the radial flow path. It is necessary to ensure the reliability of the rotor and the rotor winding, which has been expensive. However, the rotor winding at the end of the winding slot is located inside the mounting position of the retaining ring, and the radial flow passage outlet cannot be provided. In addition, this portion is a portion where the amount of thermal elongation of the rotor winding is large, and a portion that extends in the circumferential direction of the rotor winding, so that a bending moment is also added thereto. If a large number of cooling channels such as directional cooling channels are provided, the strength of the rotor winding is reduced, which may cause deformation of the winding. For this reason, a large capacity is achieved by reducing the output per generator volume, that is, by increasing the size of the generator and reducing the heat load to secure a large output. I had to do it. Disclosure of the invention

An object of the present invention is to provide a rotating electric machine that is inexpensive, has high reliability, and can increase the output in a compact manner.

A first feature of the present invention for achieving the above object is that a rotor having a plurality of winding slots on an outer peripheral surface extending in the axial direction at circumferentially spaced intervals on both sides of a magnetic pole portion. A plurality of rotor windings alternately laminated with a conductor and an insulating material so as to extend inside the winding slot and outside the winding slot concentrically with respect to the magnetic pole; A holding ring for holding an end of the rotor winding inside the winding slot and an outer periphery of a portion extending outside the winding slot; and a distribution device for flowing a cooling fluid inside the rotating electric machine. In a rotating electric machine, a plurality of radial flow paths are provided so that the cooling fluid flows in a radial direction in a portion of the rotor winding located on the center side in the winding slot. The cooling fluid is applied axially to the part located inside the winding slot inside the retaining ring of An axial flow passage communicating with the radial flow passage is provided between the radial space and a space extending outside the winding slot inside the retaining ring of the rotor winding. Configuration And there.

Preferably, the axial flow passage is formed so as to be located at an outer peripheral portion of the rotor winding or at a portion near the outer peripheral portion.

Preferably, an insulation block is arranged on an outer peripheral surface of the rotor winding, and the axial flow passage is formed on an inner surface of an outermost layer of the rotor winding. is there.

Further, preferably, the block is formed of a thermosetting resin-based composite material reinforced with glass fibers.

A second feature of the present invention is that the outer peripheral surface of the stator has a plurality of winding slots axially spaced apart from each other on both sides of the magnetic pole portion and extending in the axial direction, and a bottom surface of the winding slot. A rotor having sub-slots extending in the axial direction, and a plurality of conductors and insulating materials alternately laminated so as to extend concentrically with respect to the magnetic poles in the winding slots and outside the winding slots. A rotor winding, an edge disposed outside the outer peripheral surface of the rotor winding via an insulating block, an end of the rotor winding inside the winding slot, and an insulating block outside the end. And a holding ring for holding an outer peripheral side of a portion extending outside the winding slot, and a flow device for flowing a cooling fluid inside the rotating electric machine, wherein the rotor winding, the insulating block, and the edge are connected to each other. Part located at the center side in the winding slot In a rotating electric machine provided with a plurality of radial flow passages so that the cooling fluid flows radially from the sub-slot, a portion located inside the winding slot inside a retaining ring of the rotor winding is provided. An axial flow passage through which the cooling fluid flows in the axial direction is provided, and the axial flow passage is provided with a space around a portion extending outside the winding slot inside the holding ring of the rotor winding and the radius as described above. The configuration is such that it is formed at or near the outer peripheral portion of the rotor winding so as to communicate with the directional flow passage.

A third feature of the present invention is that a stator having a plurality of winding slots on its outer peripheral surface that extend in the axial direction at circumferentially spaced intervals on both sides of the magnetic pole portion, A plurality of rotor windings in which conductors and insulating materials are alternately stacked so as to extend in the winding slots and outside the winding slots concentrically with respect to the magnetic poles; A rotor holding an end inside the winding slot and an outer periphery of a portion extending outside the winding slot; and a circulation device for flowing a cooling fluid inside the rotating electric machine, In a rotary electric machine having a plurality of radial flow passages provided so that the cooling fluid flows in a radial direction in a portion located on the center side in the winding slot, the rotor winding is continuously wound. And an outer turn portion formed separately from the inner turn portion. The inner turn portion is formed inside the holding ring of the outer turn portion of the rotor winding. An axial flow through which the cooling fluid flows in an axial direction in a portion located in the line slot That is, a passage is provided.

Preferably, the outer turn portion is formed of a single-layered winding, is divided into two portions at a portion extending outside the winding slot, and the divided portions are connected by welding. is there.

Preferably, an auxiliary radial flow passage is provided in the axial flow passage so that the cooling fluid flows in a radial direction in a portion located inside the winding slot inside the retaining ring of the rotor winding. The configuration is such that the communication is provided. Preferably, the axial flow passage is provided so as to extend along both sides of the conductor of the rotor winding. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic structural view of an embodiment of an air-cooled turbine generator according to the present invention.

FIG. 2 is a perspective view showing a winding structure at the end of the rotor according to the present invention.

FIG. 3 is a perspective view showing a partial cross-sectional structure of a winding slot according to the present invention. FIG. 4 is a perspective view showing a slot end rotor winding structure according to the present invention.

FIG. 5 is an axial longitudinal sectional view showing a slot end rotor winding structure according to the present invention.

FIG. 6 is a perspective view showing a manufacturing process of the rotor winding according to the present invention.

FIG. 7 is a perspective view showing a manufacturing process of the split winding of the rotor winding according to the present invention.

FIG. 8 is a longitudinal sectional view showing a structure of a slot end rotor winding in a second embodiment of the present invention.

FIG. 9 is a sectional view showing a structure of a slot end rotor winding in a third embodiment of the present invention.

FIG. 10 is a partial cross-sectional perspective view of a winding slot according to a fourth embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the rotating electric machine of the present invention, specifically, a turbine generator will be described with reference to the drawings.

First, the schematic structure of the air-cooled turbine generator of the present invention will be described with reference to FIG. Note that, in this embodiment, a description is given of a case where air is used as the cooling fluid, but a fluid other than air may be used. The rotor 1 is rotatably supported by a bearing 3 in a stator 2. On the rotor 1, a plurality of rotor windings 4 constituting the same magnetic pole are fixed concentrically around the magnetic pole. The rotor winding 4 is held by a winding slot formed at an interval on the outer peripheral surface of the rotor 1 with respect to the portion extending in the axial direction, and extends in the circumferential direction at the end of the rotor. Part is retained by retaining ring 5. Have been. Although FIG. 1 shows only the collector ring 6 for supplying current to the rotor 1 in FIG. 1, the protection ring 5 is the same as the protection ring 5, but there is a similar one on the bin side. The structure of the winding slot and the winding at the end of the rotor will be described later. A fan 7 constituting a fluid circulation device is arranged between the retaining ring 5 and the bearing 3, and the fan 7 circulates the air cooled by the air cooler 8 into the generator. Let it. A duct is provided so that the air sent from fan 7 can be supplied to rotor 1, stator 2 and air gap 9 of rotor 1, end of stator winding 10 and the like. ing. The stator 2 is supported by a stator frame 11 which is fixed to a foundation (not shown).

Next, a first embodiment of the rotor of the turbine generator according to the present invention will be described with reference to FIGS.

As shown in Fig. 2, the rotor has two magnetic poles. In a turbine generator, the number of magnetic poles is often two or four, but other numbers may be used depending on the application and output. As shown in FIG. 5, the retaining ring 5 is, as shown in FIG. 5, a portion of the rotor winding 4 located at the end of the winding slot 14 of the rotor 1 and a portion protruding from the winding slot. It holds the surface from the outside. Holes 12 on the outer peripheral surface of rotor 1 are holes formed in edge 19 to prevent rotor winding 4 from coming off winding slot 14 due to centrifugal force. This is an air discharge hole that constitutes a part of a radial flow passage that penetrates from the subslot 15 to the rotor outer peripheral surface. The rotor 1 has an axial section 101 in which the air discharge holes 12 of the radial flow path are provided, and an end of the rotor winding 4 coming out of the winding slot 14. It has a section 102 and a winding slot end section 103 sandwiched between them. The end of the winding slot end section 103 is This is a section where the ring 5 is fixed to the rotor 1, and is a section where it is not possible to provide an air discharge hole 12 in the edge 19 to be located inside the ring 5.

Fig. 3 shows the winding slot for two slots. A sub-slot 15 is provided at the bottom of the winding slot 14 for accommodating the rotor winding 4, and the air sent from the fan 7 shown in FIG. An axial ventilation channel is provided for ventilation in the axial direction at the center. The width of the sub-slot 15 is slightly smaller than the width of the winding slot 14 so that the wire conductor 16 and the like do not fall into the sub-slot 15. . The rotor winding 4 is composed of winding conductors 16 having a large number of ventilation holes 17 stacked in a plurality of turns in the radial direction.

A thin insulating sheet (not shown) is perforated at the same position as 16. The centrifugal force acting on the rotor winding 4 composed of the winding conductor 16 and the insulating sheet is supported by the edge 19 via the insulating block 18. Rotor winding 4 is made of insulation block 18 and slot insulation 2 made of a material with good electrical insulation properties such as FRP (thermosetting resin-based composite material reinforced with glass fiber). It is surrounded by 0 and spacer 21 and is electrically insulated from rotor 1. The cooling fluid guided in the subslot 15 in the axial direction flows through the ventilation hole 17 of the wound conductor 16, the hole of the insulating sheet, the hole 13 of the insulating block 18, and the edge. The flow splits and flows into the radial flow path 17 1 formed by the holes 12 of 19 to cool the rotor winding 4. The radial flow paths 17 1 are provided at a constant pitch in the axial direction of the rotor winding 4, and the pitch or the ventilation area is appropriately adjusted in order to alleviate the air volume distribution in each radial flow path. Is preferred.

FIG. 4 shows a rotor winding structure at the end of the rotor of the present invention. FIG. 5 is a longitudinal sectional view in the axial direction showing the slot end rotor winding structure. As described in the description of FIG. 2, the slot end has an insulated section 10.3 in which the radial channel 171 is not provided because it overlaps the mounting portion of the retaining ring 5. In addition, this part is where the bending moment and the tensile and compressive forces simultaneously act due to the thermal elongation of the rotor winding, and it is also a section where sufficient winding strength is required. The heat generated by the rotor winding 14 in this section is radiated by heat conduction to the cooling fluid flowing through the radial flow path 171, and the heat sink located in the space inside the retaining ring 5 Heat is radiated to the cooling fluid at the cooling surface 24. However, this heat release alone is not enough, and the temperature of this adiabatic section will be higher than other parts. Therefore, in this embodiment, the axial ventilation passage 23 connecting the space inside the retaining ring 5 and the radial passage 17 1 is provided only on the outer peripheral surface of the outermost turn of the rotor winding 4. Things. The axial air flow path 2 3, and this is the cooling provided to all the rotor winding 4 is preferred correct force ⁵ ', Ri by the and this provided only the most temperature increases the outer diameter of turn side, the An efficient temperature-reducing effect can be obtained without substantially reducing the strength of the rotor winding 4 in the portion. The cooling fluid 21 branches off just before the inlet of the subslot 15, flows through the axial ventilation channel 23 while cooling the outer surface of the rotor winding 4, and joins the radial channel 17 1 . The cooling fluid 21 flowing through the axial ventilation passage 23 cools the outermost turn of the heat-insulating section 103, and the thermosyphon cooling surface of the rotor winding 4 near the end of the slot. 24 also has the effect of improving heat transfer. In other words, the axial ventilation channel 23 can provide an increase in cooling characteristics larger than the cooling area, and the temperature of the adiabatic section of the other turns without the axial ventilation channel 23 also decreases. It can be done. Also, the strength is sensitive to temperature. Since the temperature of the edge block 18 can be reduced, the life of the insulating block 18 can be further extended. As shown in Fig. 5, the cooling fluid 21 flowing through the axial ventilation passage 23 is used to cool the outermost turn of the rotor winding 4 and the inside of the insulation block 18 thereof. Both merge into the radial channel 171, which is near the slot end. FIG. 6 is a perspective view showing a manufacturing process of the rotor winding according to the present invention. The windings 25 other than the outermost turn winding 26 have holes for the radial flow path by punching or the like while continuously shaping the windings using a winding machine. Reference numeral 17 denotes a perforated continuous winding. On the other hand, the winding 26 of the outermost turn is a divided winding obtained by dividing one winding at the winding end. The pair of split winding wires 26 are electrically connected by brazing the connecting portions 27 before being assembled into the rotor. The split winding wire 26 is formed by forming a cooling hole 17 and an axial ventilation channel 23 as a radial ventilation channel of the slot in a linear conductor 28 as shown in FIG. It is shaped into a winding shape by a bending machine. According to this, when the cooling holes 17 and the axial ventilation passages 23 are processed, the conductors 28 are straight, so that processing can be easily performed without using a special machine tool. Since the man-hours required for brazing by combining the split windings 26 are only those for the outermost turns, the effect on the overall manufacturing cost is small.

In this embodiment, the divided conductor 26 is used only for the outermost turn, but may be used for a plurality of turns if manufacturing cost permits. If the divided conductors 26 are used for all turns, the manufacturing cost and the number of steps increase, and the total ventilation area of each of the axial ventilation passages 23 is increased by the radial passage at the portion where they join. The cooling area is too large with respect to the ventilation area of 17 1, and the amount of air in each of the axial cooling passages 23 is rather small, thereby reducing the cooling effect. Axial ventilation The ratio of the area of the ventilation area of the flow path 23 to the area of the radial ventilation flow path 17 1, that is, the number of turns to provide the axial ventilation flow path 23, reduces the amount of temperature reduction in this part. Must be set as follows. FIG. 8 is a longitudinal sectional view showing a structure of a slot end rotor winding in a second embodiment of the present invention. As shown in FIG. 8, a radial ventilation channel 30 is added to the rotor winding 4 located inside the mounting portion of the retaining ring 5, and this is connected to the axial ventilation channel 23, and the shaft is If the direction ventilation passage 23 has the function of the outlet ventilation passage, the temperature of this portion can be further reduced.

FIG. 9 is a longitudinal sectional view showing a structure of a rotor winding portion at a slot end in a third embodiment of the present invention. As shown in FIG. 9, by providing the axial ventilation passage 23 inside the opposite side of the insulation block 18, the insulation block 18 is arranged at the end of the rotor winding 4. Since the entire surface is in contact with the outside of the outer diameter turn, the compression surface pressure of the insulation block 18 can be reduced, and the reliability of the insulation block 18 can be further improved. If an axial ventilation channel 23 is provided outside the innermost turn of the outermost turn and opposed to the axial ventilation channel 23 inside the outermost turn, the ventilation area can be increased. I can do it. In this case, the split winding 26 is used for two turns, the outermost turn and the inner turn.

The same cooling effect can be obtained by providing the above-mentioned axial ventilation channel on the insulation block side instead of on the winding conductor side, but it is sufficient for the insulation block at the end of the slot. Since there is no dimensional allowance for providing a large ventilation area, it is preferable to provide it on the winding conductor side.

FIG. 10 is a perspective view showing a partial cross-sectional structure of a winding slot part according to a fourth embodiment of the present invention. The axial ventilation passage 23 shown in FIG. 10 extends along both sides of the conductor of the rotor winding 4. It is provided in. By providing the axial ventilation channel 23 in this way, the processing can be further facilitated. In particular, if the corners on both sides of the conductor are cut obliquely, the calorie is easier. .

As described above, in the present invention, the temperature distribution of the rotor winding can be reduced and the average temperature can be reduced, so that the life of the insulation block and the insulator between the conductors can be extended, and the reliability can be improved. It becomes possible to obtain a rotor.

ADVANTAGE OF THE INVENTION According to this invention, the temperature rise by the heat generation of a rotor can be reduced with a simple structure, and a low cost and highly reliable rotating electric machine can be obtained. Note that the present invention can be embodied in various other forms without departing from the spirit or main features. As such, the preferred embodiments described herein are illustrative and not limiting. The scope of the invention is indicated by the appended claims, and all modifications that come within the meaning of the claims are intended to be included within the scope of the invention.

In the present invention, since the cooling fluid flows in the axial direction in the portion located in the winding slot inside the holding ring of the rotor winding, the cooling fluid is provided by the flow device. By flowing through the axial flow passage, the portion located inside the winding slot inside the retaining ring of the rotor winding can be forcibly cooled with a cooling fluid, and the rotor winding can be cooled. The temperature rise in this part where the temperature tends to be high can be effectively suppressed. In addition, since the outlet side of the axial flow passage is communicated with the radial flow passage so as to be able to flow outside the outer peripheral surface of the rotor, an independent flow structure for flowing outside the outer peripheral surface is not required. A simple configuration can be achieved. Furthermore, since the inlet side of the axial flow passage communicates with the space surrounding the portion extending outside the winding slot inside the holding ring of the rotor winding, the inside of the holding ring of the rotor winding is formed. Extends outside the winding slot The heat transfer of the thermosyphon cooling surface in the portion to be heated can be further improved. Thus, with a simple configuration, the heat-resistant temperature of the insulating material of the rotor winding can be reduced, an inexpensive rotor winding can be used, and the winding conductor on the inner side of the retaining ring can be used. Can suppress thermal expansion, and can reduce rotational vibration caused by distortion due to thermal expansion. In addition, since the temperature rise of the rotor winding inside the retaining ring can be suppressed, the temperature increase of the entire rotor winding can be suppressed, and the output of the entire rotating electric machine can be made compact to increase the output. It becomes possible to plan.

In addition, since the axial flow passage is formed at the outer peripheral portion of the rotor winding or in the vicinity thereof, it is possible to effectively cool the portion of the rotor winding where the temperature tends to be particularly high, and The heat transfer of the thermosiphon cooling surface in the portion extending outside the winding slot inside the holding ring of the rotor winding can be further improved.

Furthermore, since the axial flow passage is formed on the inner surface of the outermost layer of the rotor winding having an insulating block disposed on the outer surface of the outer periphery, the insulating block is formed outside the outermost layer of the rotor winding. Full contact with the side surface reduces the compressive surface pressure of the insulating block and effectively cools the insulating block whose strength is sensitive to temperature, thereby improving the reliability of the insulating block. Can be.

In addition, the rotor winding is formed by an inner turn portion of a multi-layer continuously wound and an outer turn portion formed separately from the inner turn portion, and an outer turn portion of the rotor winding is formed. An axial flow passage through which the cooling fluid flows in the axial direction is provided inside the winding ring inside the retaining ring of the section, so that the winding is continuously wound around the inner turn using a winding machine. A radial flow path can be formed by punching or the like while shaping, and an axial flow path can be easily formed into a predetermined shape in a separate outer turn independently of the formation of the inner turn. As a result, the rotor winding can be manufactured efficiently. Furthermore, the outer turn portion is composed of one layer of one turn, and is divided into two portions extending outside the winding slot, and the divided portions are connected by welding. An auxiliary radial flow passage is provided in the portion located inside the winding slot inside the retaining ring of the rotor winding so as to allow the cooling fluid to flow in the radial direction. The part located inside the winding slot inside the retaining ring can be cooled more strongly.

Furthermore, since the axial flow passage is provided so as to extend along both sides of the conductor of the rotor winding, the processing of the axial flow passage is facilitated, and the winding is performed inside the holding ring of the rotor winding. It is possible to further improve the heat transfer on both sides of the thermosiphon cooling surface of the portion extending outside the line slot.

According to the present invention, a rotating electric machine that is inexpensive, has high reliability, and can increase the output in a compact manner is obtained.

Claims

The scope of the claims

1. a stator, a rotor having a plurality of winding slots on its outer peripheral surface extending in the axial direction at circumferentially spaced sides on both sides of the magnetic pole portion, and the windings concentric with the magnetic poles. A plurality of rotor windings in which conductors and insulating materials are alternately laminated so as to extend into the wire slot and out of the winding slot; and in the winding slot of the rotor winding. A holding ring for holding the outer periphery of a portion extending outside the winding slot of the rotor winding, and a flow device for flowing a cooling fluid inside the rotating electric machine, wherein the winding slot of the rotor winding is provided. In a rotating electric machine having a plurality of radial flow passages provided so that the cooling fluid flows in a radial direction in a portion located at a center side in the rotor, a winding slot is provided inside a retaining ring of the rotor winding. An axial flow passage for circulating the cooling fluid in an axial direction in a portion located in the axial direction; The rotating electric machine is characterized in that the passage is formed so as to communicate a space around a portion extending outside the winding slot inside the holding ring of the rotor winding and the radial flow passage. .

2. The rotating electric machine according to claim 1, wherein the axial flow passage is formed at an outer peripheral portion of the rotor winding or at a portion near the outer peripheral portion.

3. The axial flow passage according to claim 1, wherein an insulating block is arranged outside an outer peripheral surface of the rotor winding, and the axial flow passage is formed on an inner surface of an outermost layer of the rotor winding. Rotating electric machine.

4. The rotating electric machine according to claim 3, wherein the block is formed of a thermosetting resin-based composite material reinforced with glass fibers.

5. A stator and a plurality of winding slots extending in the axial direction at both sides of the magnetic pole part and extending in the circumferential direction on the outer peripheral surface, and extend in the axial direction on the bottom surface of the winding slot. A rotor having sub-slots, and a plurality of rotor windings in which conductors and insulating materials are alternately stacked so as to extend concentrically with respect to the magnetic poles in the winding slot and outside the winding slot. A wire, a wedge arranged outside an outer peripheral surface of the rotor winding via an insulating block, and a wire in front of the rotor winding. A retaining ring for holding an end in the winding slot and an insulating block outside the winding slot and an outer peripheral side of a portion extending out of the winding slot, and flowing a cooling fluid inside the rotating electric machine. And a radial device such that the cooling fluid flows radially from the sub-slot to a portion of the rotor winding, the insulating block, and the edge located on the center side of the winding slot in the winding slot. A rotating electrical machine provided with a plurality of directional flow paths, wherein an axial flow path through which the cooling fluid flows in the axial direction is provided in a portion located inside the winding slot inside the retaining ring of the rotor winding; The axial flow passage is provided at an outer peripheral portion of the rotor winding so as to communicate a space around a portion extending outside the winding slot inside the holding ring of the rotor winding and the radial flow passage. Or formed in the vicinity of it. Rotating electric machine to.

6. A stator, a rotor having a plurality of winding slots on its outer peripheral surface extending in the axial direction at circumferentially spaced sides on both sides of the magnetic pole portion, and the windings concentric with the magnetic poles. A plurality of rotor windings in which conductors and insulating materials are alternately laminated so as to extend into the wire slot and out of the winding slot, and an end of the rotor winding in the winding slot. And a holding ring for holding the outer circumference of a portion extending out of the winding slot, and a flow device for flowing a cooling fluid inside the rotating electric machine, wherein the inside of the winding slot of the rotor winding is provided. In a rotating electric machine in which a plurality of radial flow passages are provided in a portion located on the center side so that the cooling fluid flows in the radial direction, the rotor winding is formed of a multi-layered structure wound continuously. An inner turn portion, and an outer turn portion formed separately from the inner turn portion, An axial flow passage through which the cooling fluid flows in the axial direction is provided in a portion located inside the winding slot inside the holding ring of the outer turn portion of the rotor winding. Rotating electric machine.

7. The outer turn portion is constituted by a single layer of one turn, is divided into two portions at a portion extending outside the winding slot, and the divided portions are connected by welding. The rotating electric machine according to 6.

8. An auxiliary radial flow passage communicating with the axial flow passage so that the cooling fluid flows in a radial direction in a portion located inside the winding slot inside the retaining ring of the rotor winding. 7. The rotating electric machine according to claim 1, wherein the rotating electric machine is provided. .

9. The rotating electric machine according to claim 1, wherein the axial flow passage is provided so as to extend along both sides of the conductor of the rotor winding.