JP2010104202A - Rotor of rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively reduce draft loss in the rotor of a rotating electrical machine. <P>SOLUTION: The rotor of the rotating electrical machine is equipped, in a coil slot 12 formed with a predetermined space on the cylindrical iron core 10 of the rotor with a magnetic pole as a center, with plural stages of rotor coils 14 cooled in a radial flow with a field coil stacked and housed in a multi-ringed shape; a plurality of radial ducts 18 bored in the radial direction of the plural stages of rotor coils 14 to pass through cooling gas; and a subslot 19 disposed in the radial direction of the iron core at the bottom of an inner-diametric portion in the coil slot 12 to supply the cooling gas to a plurality of radial ducts 18. Further in the rotor, the cooling gas C is taken into the subslot 19 from both ends of the rotor iron core 11, and divided into a plurality of radial ducts 18 to cool the plural stages of rotor coils 14 in a radial-flow manner. A partition 33A is provided to prevent differently divided cooling gas from joining together in the iron core direction at a predetermined position inside the subslot 19. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine such as a generator, and more particularly to a rotor of a rotating electrical machine having a structure in which a rotor coil is cooled by a cooling gas.

  A rotating electrical machine (rotating electrical machine) such as a generator is configured in a state in which a hollow cylindrical stator and a cylindrical rotor having a diameter slightly smaller than the diameter of the hollow portion are arranged concentrically. ing. Each of the stator and the rotor is provided with an electrically conductive bar such as copper, that is, a so-called coil in the axial direction. When the rotor is rotated after exciting the rotor-side coil, the stator and the rotor are moved to the stator side. A current is induced. At this time, a large amount of heat is generated in the stator and rotor due to electrical loss, so special cooling is required, and a cooling gas is sent into the machine by installing a fan in the rotor. Forced cooling is performed. In particular, the cooling performance of the rotor coil whose main driving force is the rotational centrifugal force is a critical factor that affects the performance of a rotating electrical machine such as a generator.

  In order to cool the rotor coil, a so-called direct cooling method in which the above-described cooling gas is directly brought into contact with the coil conductor is widely used. Among several direct cooling methods, a radial flow method and a diagonal flow method are used. The method has become mainstream. Among them, the former is a turbine generator with medium capacity or higher because of its good cooling performance even though the structure is simple, and the latter can supply cooling gas from the center of the rotor. Often used in machines.

  In the radial flow method and the diagonal flow method, ventilation holes that are perforated at intervals in the longitudinal direction of the coil are provided over the entire length of the rotor core of the rotor coil, and cooling is performed by passing cooling gas through the ventilation holes. However, the shape of these ventilation holes, the cooling gas supply method, and the flow mode are different.

  FIG. 15 shows a schematic configuration and overall ventilation flow of a rotating electrical machine having a radial flow type rotor, FIG. 16 shows a cross-sectional shape and ventilation flow when the rotor is viewed from the side, and FIG. 17 shows the rotor in the direction of the core axis. The cross-sectional shape seen from is shown.

  As shown in FIG. 15, in the rotating electrical machine, the stator 1 and the rotor 2 are arranged concentrically via an air gap G, and are cooled by the gas cooler 3 according to the ventilation flow indicated by the arrows. The cooled cooling gas C is taken into the stator 1 and the rotor 2 by the fan 4 to be cooled. In the rotor 2, as shown in FIGS. 16 and 17, coil slots 12 are provided in a cylindrical rotor core 11 at a predetermined interval, and a slot bottom insulating plate 13A is provided at the lowermost stage in each coil slot 12. The rotor coil 14 and the turn insulator 15 are accommodated in a plurality of stages, and are further fixed by a crimp page block 16 and a rotor wedge 17.

  The radial flow type rotor 2 supplies the cooling gas C to a plurality of radial ducts (or ventilation holes) 18 that are perforated in the radial direction of the rotor coil 14 and allow the cooling gas C to pass therethrough. The coil slot 12 is provided with a sub-slot 19 disposed along the core axis direction at the bottom of the inner diameter of the coil slot 12. When the cooling gas C is taken into the subslot 19 from both ends of the rotor core 11 due to the centrifugal fan effect caused by the rotation of the rotor 2, the cooling gas C is sequentially supplied to a plurality of radial ducts 18 toward the center of the iron core. The heat generated by the multi-stage rotor coil 14 is removed. The cooling gas C that has cooled the rotor coils 14 in the plurality of stages is sent to the air gap G between the rotor 2 and the stator core 10 on the stator 1 side, and both sides of the air supply section of the stator core 10. Exhaust through the exhaust section located at

  On the other hand, as shown in FIG. 18, the diagonal flow type rotor 2 includes a plurality of air supply diagonal ducts (or ventilation holes) that take in the cooling gas C from the outer diameter side to the inner diameter side of the plurality of stages of rotor coils 14. ) 21 </ b> A and a plurality of exhaust diagonal ducts 21 </ b> B for discharging the cooling gas C from the inner diameter side to the outer diameter side of the multi-stage rotor coil 14. For example, the rotor coil 14 located on the outermost diameter side includes a diagonal duct 21A or 21B as shown in FIG. Further, the first stage rotor coil 14 located on the innermost diameter side includes a cooling groove 22 as shown in FIG. The cooling gas C is taken into the plurality of supply diagonal ducts 21 </ b> A so as to penetrate from the air gap G, and is folded back by the cooling grooves 22 of the first stage rotor coil 14 located on the innermost side, so that the plurality of exhaust gases are exhausted. Enters the diagonal duct 21 </ b> B and removes the heat generated by the rotor coil 14. The cooling gas C that has cooled the rotor coils 14 in the plurality of stages is sent to the air gap G between the rotor 2 and the stator core 10 on the stator 1 side, and both sides of the air supply section of the stator core 10. Exhaust through the exhaust section located at

  In both of the above two methods, since a plurality of ventilation holes are spaced apart in the direction of the iron core, the ventilation loss when the cooling gas C passes through each ventilation hole is different, and cooling is performed depending on the position of each ventilation hole. It is well known that there is a difference in gas flow distribution.

Various techniques have been devised as an improved technique for reducing the non-uniformity of the air volume distribution. For example, in the radial flow method, as shown in FIG. As shown in FIG. 2 of Patent Document 1, the subslot depth decreases stepwise toward the center of the iron core of the rotor. A method of configuring is known.
JP 2001-178050 A

  However, according to the conventional method, the ventilation loss in the sub-slot in the central part of the iron core increases, resulting in a decrease in cooling gas in the vent hole in the central part of the iron core and an increase in cooling gas in the vent hole in the vicinity of the iron core end.

  In particular, the generator and motor rotors are generally symmetrical in terms of cooling design, but in the actual machine, the direct connection side connected to the turbine or load machine and the opposite direct connection On the other hand, the upstream side of the fan is not exactly the same due to structural limitations, and there is a slight flow unbalance between the direct connection side and the anti-direct connection side. For this reason, between the air supply holes having different air supply directions in the cooling center of the core coil in the sub-slot 19 in the radial flow method and the first stage rotor coil 14 located on the innermost diameter side in the diagonal flow method. In such a case, the cooling path as designed is not always configured, and a collision flow S as shown in FIG. 21 and a branch flow (or collision flow) B as shown in FIG. It is speculated that it causes an increase in ventilation loss.

  This invention is made | formed in view of the said situation, and it aims at providing the rotor of the rotary electric machine which reduces a ventilation loss efficiently.

  A rotor of a rotating electrical machine according to an aspect of the present invention includes a multi-stage rotation in which field coils are stacked in a multi-annular manner around a magnetic pole in a coil slot provided at a predetermined interval in a cylindrical rotor core. And a plurality of radial ducts that are perforated in the radial direction of the plurality of stages of rotor coils to allow cooling gas to pass therethrough, and an iron core shaft at the inner diameter bottom portion of the coil slot for supplying cooling gas to the plurality of radial ducts. A plurality of sub-slots arranged along the direction, cooling gas is taken into the sub-slots from both ends of the rotor core and branched into the plurality of radial ducts to cool the plurality of stages of rotor coils. In a rotor of a radial flow type rotating electrical machine, a partition for preventing separate cooling gases from joining in the direction of the iron core at a predetermined position in the sub-slot Wherein the parts are provided.

  ADVANTAGE OF THE INVENTION According to this invention, a ventilation loss can be efficiently reduced in the rotor of a rotary electric machine.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
First, with reference to FIGS. 1-8, the rotor of the rotary electric machine of the radial flow system which concerns on the 1st Embodiment of this invention is demonstrated.

  FIG. 1 is a diagram showing a cross-sectional shape and a ventilation flow when a rotor of a radial flow type rotating electrical machine according to the first embodiment of the present invention is viewed from the side. The schematic configuration of the rotating electrical machine including the rotor of the present embodiment is the same as that shown in FIG. Further, the cross-sectional shape of the rotor according to the present embodiment viewed from the iron core direction is the same as that shown in FIG. However, as will be described later, the structure related to the subslot 19 is different from the conventional one. Hereinafter, description will be made with reference to FIGS. 15 and 17 together.

  As shown in FIG. 1, in the rotor 2 according to the present embodiment, coil slots 12 are provided in a cylindrical rotor core 11 at a predetermined interval, and a slot bottom insulating plate 13A is provided in each coil slot 12. A plurality of stages (e.g., eight stages) of rotor coils 14 and turn insulators 15 are alternately accommodated through the slot insulators 13, and are further fixed by a clear page block 16 and a rotor wedge 17. ing. The rotor coil 14 is formed by stacking field coils around a magnetic pole in a multi-ring shape, with a turn insulator 15 sandwiched between stages.

  Further, the rotor 2 according to the present embodiment adopts a radial flow method as a cooling method, a plurality of radial ducts (or ventilation holes) 18 that are perforated in the radial direction of the rotor coil 14 and allow the cooling gas C to pass therethrough, In order to supply the cooling gas C to the plurality of radial ducts 18, a sub-slot 19 is provided at the inner bottom portion of the coil slot 12 along the core axis direction. When the cooling gas C is introduced into the sub-slot 19 from both ends of the rotor core 11 due to the centrifugal fan effect caused by the rotation of the rotor 2, the cooling gas C is sequentially supplied to the plurality of radial ducts toward the center of the iron core. The heat is generated by branching the rotor coil 14 in a plurality of stages. The cooling gas C that has cooled the rotor coils 14 in the plurality of stages is sent to the air gap G between the rotor 2 and the stator core 10 on the stator 1 side, and both sides of the air supply section of the stator core 10. Exhaust through the exhaust section located at

  In particular, unlike the prior art, the rotor 2 according to the present embodiment includes a partition portion 31 </ b> A that prevents separate cooling gases C from joining in the core axis direction at a predetermined position in the subslot 19. . This partition part 31A is provided in the position which opposes the rotor coil part between the adjacent radial ducts in an iron core center part (or center part of an air supply section), for example. As a result, each cooling gas C introduced into the subslot 19 from both ends of the rotor core 11 is not mixed in the center of the iron core, and the occurrence of a collision flow that causes a ventilation loss is suppressed. Since it is efficiently guided to the plurality of radial ducts 18, the ventilation loss of the entire rotor 2 can be reduced.

  1 illustrates a case where the shape of the partition portion 31A is a quadrangular prism, but instead, a partition portion 32A having a quadrangular pyramid shape may be provided as shown in FIG. In this case, the ventilation loss can be further reduced as compared with the case where the partition portion 31A is provided. Alternatively, as shown in FIG. 3, a partition 33A having curved portions on both sides may be provided. In this case, the ventilation loss can be further reduced as compared with the case where the partition portion 32A is provided.

  The partition portions 31 </ b> A, 32 </ b> A, and 33 </ b> A shown in FIGS. 1, 2, and 3 are formed as part of the rotor core 11. That is, in the manufacturing process of the rotor 2, when the partition portion and the subslot 19 are formed, a part of the rotor core 11 is cut in the core axis direction so as to leave the partition portion. As described above, when the partition portion and the subslot 19 are formed, a part of the rotor core 11 is not cut over the entire length, but is cut so as to leave the partition portion in the iron core central portion (or the central portion of the air supply section). By doing so, the partition part and the subslot 19 can be efficiently formed without increasing the number of manufacturing steps, and further, the rigidity of the rotor core can be increased, and a safer rotor can be obtained. Can be realized.

  Further, the subslot 19 may be formed by cutting a part of the rotor core 11 with a cutter blade having a certain curvature so as to leave the partition portion in the core axis direction. In this case, it is not necessary to separately perform processing for forming a curved surface, and the partition portion 33A having a certain curvature can be easily formed on the leg surface as shown in FIG.

  1, 2, and 3 exemplify the case where each partition is a part of the rotor core 11, instead, each partition is attached to the slot bottom insulating plate 13 </ b> A of the coil slot 12. It may be a member. That is, the partition portions 31B, 32B, and 33B are used as members on the slot bottom insulating plate 13A below the first stage rotor coil located on the innermost side as shown in FIGS. The structure which can be attached may be sufficient. In addition, each (a) in FIG.4, FIG.5, FIG.6 shows sectional drawing seen from the iron-core axial direction front, and each (b) has shown sectional drawing seen from the axial direction side surface. The shapes of the partition portions 31B, 32B, and 33B are the same as the shapes of the partition portions 31A, 32A, and 33A, respectively. As described above, the partition portions 31B, 32B, and 33B in the subslot 19 are provided on the slot bottom insulating plate 13A, so that the partition portions 31B, 32B, and 33B can be installed even after the rotor 2 is manufactured. In addition, since processing becomes easy, the degree of freedom of the shape of the partition portions 31B, 32B, and 33B can be increased. Further, since the partition portions 31B, 32B, and 33B serve as a foot when installing the slot bottom insulating plate 13A, the slot bottom insulating plate 13A is stabilized and the rotor coil 14 can be easily stacked.

  FIG. 7 is a view for explaining the width of the partition portion 31A in FIG. 1 in the iron core axis direction. When the width of the rotor coil 14 between adjacent radial ducts 18 closest to the partition portion 31A is W1, and the width of the narrowest portion of the partition portion 31A in the core axis direction is W2, W2 is W1. It is desirable that it is less than or equal to half of W1. With this configuration, the ventilation loss of the cooling gas C can be more effectively reduced, and the cooling gas C can be efficiently guided to the plurality of radial ducts 18. 7 can be similarly applied to the partition portion 31B in FIG.

  FIG. 8 is a diagram for explaining the curvature radius of the curved surface portion of the partition portion 33A in FIG.

  When the width in the depth direction of the sub slot 19 is H1, and the height from the bottom of the sub slot 19 to the surface of the rotor 2 is H2, the curvature radius of the curved surface portion of the partition portion 33A is not less than H1 and not more than H2. It is desirable to be within the range. FIG. 8 shows an example in which the curved surface portion has a curvature radius R1 having the same length as H1. Here, by configuring the curved surface portion to have a radius of curvature R2 having the same length as H2 as much as possible, the bending loss of the cooling gas C at the curved surface portion can be more effectively reduced. It is possible to efficiently lead to a plurality of radial ducts 18. The configuration of FIG. 8 can be similarly applied to the partition portion 33B in FIG.

  According to the first embodiment, the following effects can be obtained.

  In the radial flow type rotor 2, by providing a partition portion 31 </ b> A that prevents separate cooling gas C from merging in the core axis direction at the iron core central portion (or the central portion of the air supply section) in the sub-slot 19. The cooling gas C introduced into the subslot 19 from both ends of the rotor core 11 is not mixed in the center of the iron core, and the efficiency is reduced in a state where occurrence of a collision flow that causes a ventilation loss is suppressed. Since it can lead to the several radial duct 18 well, the ventilation loss of the rotor 2 whole can be reduced.

  Further, by forming the leg portion of the partition portion in a circular shape using the curvature of the cutter blade, a bend pipe can be easily realized, and the bending loss at the partition portion can be reduced.

  Further, since the ventilation loss can be reduced as expected, in the central portion of the rotor 2 where the cooling effect is higher than before, the installation interval of the radial duct or cooling hole drilled in the rotor coil 14 can be increased. It becomes possible. This makes it possible for the rotor coil 14 to increase the area of the copper portion through which current passes, and to produce an effect of reducing the current density and thus the amount of heat generation, thereby contributing to the reduction of cooling gas and size reduction.

  In addition, by providing the partition portion at a position other than the central portion of the iron core of the rotor 2, asymmetrical cooling is performed in consideration of the difference in structure between the direct connection side connected to the turbine and the load machine and the anti-direct connection side. Is also possible.

  Further, when the partition portion and the subslot 19 are formed, a part of the rotor core 11 is not cut over the entire length, but is cut so that the partition portion is left in the iron core central portion (or the central portion of the air supply section). Can efficiently form the partition portion and the subslot 19 without increasing the number of manufacturing steps, and can further increase the rigidity of the rotor core, thereby realizing a safer rotor. be able to.

  Further, when the slot bottom insulating plate 13A is provided with the partition portion in the subslot 19, the partition portion can be installed even after the rotor 2 is manufactured, and processing becomes easy. The degree of freedom of shape can be increased. Further, since the partition portion serves as a substitute when installing the slot bottom insulating plate 13A, the slot bottom insulating plate 13A is stabilized and the lamination of the rotor coils 14 is facilitated.

  In addition, by configuring the rotating electrical machine in which the rotor 2 and the stator 1 of the present embodiment are concentrically arranged, the cooling efficiency of the entire rotating electrical machine can be improved, and the cooling gas can be reduced or reduced in size. Thus, it is possible to realize a rotating electrical machine that can perform safer and more stable operation.

(Second Embodiment)
Next, a rotor of a diagonal flow type rotating electrical machine according to a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 9 is a diagram illustrating a cross-sectional shape and a ventilation flow of the rotor of the rotating electrical machine according to the second embodiment of the present invention. The schematic configuration of the rotating electrical machine including the rotor of this embodiment is the same as that shown in FIG. However, the diagonal flow method ventilation flow according to the present embodiment is different from the radial flow method ventilation flow shown in FIG.

  As shown in FIG. 9, in the rotor 2 according to the present embodiment, coil slots 12 are provided in a cylindrical rotor core 11 at predetermined intervals, and a slot bottom insulating plate 13 </ b> A is provided in each coil slot 12. The rotor coil 14 and the turn insulator 15 are accommodated in a plurality of stages on the lowermost stage, and are further fixed by a crimp page block 16 and a rotor wedge 17. The rotor coil 14 is formed by stacking field coils around a magnetic pole in a multi-ring shape, with a turn insulator 15 sandwiched between stages.

  In addition, the rotor 2 according to the present embodiment employs a diagonal flow system as a cooling system, and a plurality of air supply diagonal ducts that take in the cooling gas C from the outer diameter side to the inner diameter side of the rotor coils 14 in a plurality of stages ( (Or a ventilation hole) 21A and a plurality of exhaust diagonal ducts 21B for discharging the cooling gas C from the inner diameter side to the outer diameter side of the plurality of stages of rotor coils 14. The cooling gas C is taken into the plurality of supply diagonal ducts 21 </ b> A so as to penetrate from the air gap G, and is a portion further below the first stage rotor coil 14 located on the innermost diameter side (described later). The sub-slots are folded into the plurality of exhaust diagonal ducts 21 </ b> B to remove the heat generated by the rotor coil 14. The cooling gas C that has cooled the rotor coils 14 in the plurality of stages is sent to the air gap G between the rotor 2 and the stator core 10 on the stator 1 side, and both sides of the air supply section of the stator core 10. Exhaust through the exhaust section located at

  In particular, unlike the prior art, the rotor 2 according to the present embodiment is provided with a subslot 40 having a structure similar to that of the above-described subslot 19 along the core axis direction at the inner diameter bottom portion of the coil slot 12. A plurality of air supply holes through which the cooling gas C passes from the plurality of supply diagonal ducts 21A to the subslot 40 and a plurality of exhausts from the subslot 40 are provided in the first-stage rotor coil positioned on the innermost diameter side. The diagonal duct 21B is provided with a plurality of exhaust holes for allowing the cooling gas C to pass therethrough, and a plurality of partition portions 41A for preventing separate cooling gases C from joining in the core axis direction at predetermined positions in the subslot 40. Is provided. These partition portions 41A are provided, for example, at positions where the separate cooling gases C flowing from the air supply holes having different supply directions are separated. As a result, the cooling gases C introduced into the subslots 19 from the supply holes with different supply directions do not affect each other, and the occurrence of a branch flow or a collision flow that causes a ventilation loss is suppressed. In this state, since the air is efficiently guided to the plurality of exhaust diagonal ducts 21B, the ventilation loss of the entire rotor 2 can be reduced. In addition, it is possible to eliminate the problem of ventilation loss due to cooling gas branch loss or collision loss, which has conventionally been caused by the pressure balance that sequentially changes in the cooling groove of the first stage rotor coil located closest to the inner diameter side. it can.

  9 illustrates the case where the shape of the partition portion 41A is a quadrangular prism, instead, a partition portion 42A having a quadrangular pyramid shape may be provided as shown in FIG. In this case, the ventilation loss can be further reduced as compared with the case where the partition portion 41A is provided. Alternatively, as shown in FIG. 11, partition portions 43A having curved portions on both sides may be provided. In this case, the ventilation loss can be further reduced as compared with the case where the partition portion 42A is provided.

  The partition portions 41A, 42A, and 43A shown in FIGS. 9, 10, and 11 are formed as a part of the rotor core 11. That is, in the manufacturing process of the rotor 2, when the partition portion and the subslot 40 are formed, a part of the rotor core 11 is cut in the core axis direction so as to leave the partition portion. As described above, when the partition portion and the subslot 40 are formed, a portion of the rotor core 11 is not cut over the entire length, but is cut so as to leave the partition portion at the center of each section. Thus, a safer rotor can be realized.

  The subslot 40 may be formed by cutting a part of the rotor core 11 with a cutter blade having a certain curvature so as to leave the partition portion in the core axis direction. In this case, it is not necessary to separately perform processing for forming the curved surface, and the partition portion 43A having a certain curvature can be easily formed on the leg surface as shown in FIG.

  9, 10, and 11 exemplify the case where each partition is a part of the rotor core 11, each partition is attached to the slot bottom insulating plate 13 </ b> A of the coil slot 12 instead. It may be a member. That is, as shown in FIGS. 12, 13, and 14, partition portions 41B, 42B, and 43B are used as members on the slot bottom insulating plate 13A below the first stage rotor coil located on the innermost side. The structure which can be attached may be sufficient. In addition, each (a) in FIG.12, FIG.13, FIG.14 shows sectional drawing seen from the iron-core axial direction front, and each (b) has shown sectional drawing seen from the axial direction side surface. The shapes of the partition portions 41B, 42B, and 43B are the same as the shapes of the partition portions 41A, 42A, and 43A, respectively. As described above, the partition portions 41B, 42B, and 43B in the subslot 40 are provided on the slot bottom insulating plate 13A, so that the partition portions 41B, 42B, and 43B can be installed even after the rotor 2 is manufactured. In addition, since processing becomes easy, the degree of freedom of the shape of the partition portions 41B, 42B, and 43B can be increased. In addition, since the partition portions 41B, 42B, and 43B serve as a foot when installing the slot bottom insulating plate 13A, the slot bottom insulating plate 13A is stabilized and the lamination of the rotor coil 14 is facilitated.

  According to the second embodiment, the following effects can be obtained.

  In the diagonal flow type rotor 2, the sub-slot 40 is disposed along the core axis direction at the inner diameter bottom portion of the coil slot 12, and a plurality of supply coils are provided to the first stage rotor coil located closest to the inner diameter side. A plurality of air supply holes through which the cooling gas C passes from the gas diagonal duct 21A to the subslot 40 and a plurality of air holes through which the cooling gas C passes from the subslot 40 to the plurality of exhaust diagonal ducts 21B are provided. By providing a plurality of partition portions 41A that prevent separate cooling gases C from joining in the direction of the iron core at predetermined positions, each of the air introduced in the subslot 19 from the air supply holes having different supply directions. A plurality of exhaust gases can be efficiently produced in a state in which the generation of a branch flow that causes a ventilation loss is suppressed without affecting the cooling gas C of each other. Can be guided to the diagonal duct 21B, it is possible to reduce the ventilation loss of the entire rotor 2. In addition, it is possible to eliminate the problem of ventilation loss due to cooling gas branch loss or collision loss, which has conventionally been caused by the pressure balance that sequentially changes in the cooling groove of the first stage rotor coil located closest to the inner diameter side. it can.

  Further, by forming the leg portion of the partition portion in a circular shape using the curvature of the cutter blade, a bend pipe can be easily realized, and the bending loss at the partition portion can be reduced.

  Further, since the ventilation loss can be reduced as expected, it is possible to widen the interval between the air supply holes and the exhaust holes drilled in the rotor coil 14 in the portion where the cooling effect is higher than the conventional one. As a result, the rotor coil 14 can increase the area of the copper portion through which the current passes, and has the effect of reducing the current density and thus the amount of heat generation, which can contribute to the reduction of the cooling gas and the miniaturization.

  Further, when forming the partition portion and the sub-slot 40, when the part of the rotor core 11 is not cut over the entire length but is cut so as to leave the partition portion at the center of each section, the rigidity of the rotor core is reduced. And a safer rotor can be realized.

  Further, when the slot bottom insulating plate 13A is provided with the partition portion in the subslot 40, the partition portion can be installed even after the rotor 2 is manufactured, and the processing becomes easy. The degree of freedom of shape can be increased. Further, since the partition portion serves as a substitute when installing the slot bottom insulating plate 13A, the slot bottom insulating plate 13A is stabilized and the lamination of the rotor coils 14 is facilitated.

  In addition, by configuring the rotating electrical machine in which the rotor 2 and the stator 1 of the present embodiment are concentrically arranged, the cooling efficiency of the entire rotating electrical machine can be improved, and the cooling gas can be reduced or reduced in size. Thus, it is possible to provide a rotating electrical machine that can perform safer and more stable operation.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

The figure which shows the cross-sectional shape and ventilation flow which looked at the rotor of the rotary electric machine of the radial flow system which concerns on the 1st Embodiment of this invention from the side surface. The figure which shows the cross-sectional shape and ventilation flow in case a partition part has the shape of a quadrangular pyramid as a modification of FIG. The figure which shows the cross-sectional shape and ventilation flow in case a partition part has a curved surface part as a modification of FIG. The figure which shows the cross-sectional shape in case the partition part of the embodiment is a member attached to the slot bottom insulating board. The figure which shows the cross-sectional shape in case a partition part has a shape of a quadrangular pyramid as a modification of FIG. The figure which shows the cross-sectional shape in case a partition part has a curved surface part as a modification of FIG. The figure for demonstrating the width | variety of the iron core axial direction of the partition part in FIG. The figure for demonstrating the curvature radius of the curved surface part of the partition part in FIG. The figure which shows the cross-sectional shape and ventilation flow of the rotor of the rotary electric machine of the diagonal flow system which concerns on the 2nd Embodiment of this invention. The figure which shows the cross-sectional shape and ventilation flow in case a partition part has the shape of a quadrangular pyramid as a modification of FIG. The figure which shows the cross-sectional shape and ventilation flow in case a partition part has a curved surface part as a modification of FIG. The figure which shows the cross-sectional shape in case the partition part of the embodiment is a member attached to the slot bottom insulating board. The figure which shows the cross-sectional shape in case a partition part has a shape of a quadrangular pyramid as a modification of FIG. The figure which shows the cross-sectional shape in case a partition part has a curved surface part as a modification of FIG. The figure which shows schematic structure of a rotary electric machine, and the whole ventilation flow. The figure which shows the cross-sectional shape and ventilation flow which looked at the rotor of the rotary electric machine of a radial flow type from the side. The figure which shows the cross-sectional shape which looked at the rotor of the rotary electric machine of a radial flow type from the iron core axial direction. The figure which shows the cross-sectional shape and ventilation flow which looked at the rotor of the rotary electric machine of a diagonal flow system from the front. The top view which looked at the rotor coil located in the outermost diameter side from the outer diameter side. Sectional drawing which looked at the rotor coil located in the innermost diameter side from the outer diameter side. The figure which shows a mode that the collision flow has arisen in the rotor of FIG. The figure which shows a mode that the branch flow has arisen in the rotor of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Stator, 2 ... Rotor, 3 ... Gas cooler, 4 ... Fan, 10 ... Stator iron core, 11 ... Rotor iron core, 12 ... Coil slot, 13 ... Slot insulator, 13A ... Slot bottom insulating plate, DESCRIPTION OF SYMBOLS 14 ... Rotor coil, 15 ... Turn insulator, 16 ... Clear page block, 17 ... Rotor wedge, 18 ... Radial duct, 19 ... Subslot, 21A ... Diagonal duct for supply, 21B ... Diagonal duct for exhaust, 22 ... cooling groove, 31A, 31B, 32A, 32B, 33A, 33B ... partition, 40 ... subslot, 41A, 41B, 42A, 42B, 43A, 43B ... partition, C ... cooling gas, G ... air gap.

Claims (11)

A multi-stage rotor coil in which field coils are stacked in a multi-ring shape around a magnetic pole in a coil slot provided at a predetermined interval on a cylindrical rotor core, and a diameter of the multi-stage rotor coil A plurality of radial ducts which are perforated in a direction to allow cooling gas to pass therethrough, and a sub-slot disposed along the core axis direction at the inner diameter bottom portion of the coil slot for supplying cooling gas to the plurality of radial ducts. In a rotor of a rotary electric machine of a radial flow method that cools the plurality of stages of rotor coils by taking cooling gas from both ends of the rotor core into the subslot and branching to the plurality of radial ducts,
A rotor of a rotating electrical machine, wherein a partition portion is provided to prevent separate cooling gases from joining together in a direction of the iron core at a predetermined position in the subslot.   The rotor of a rotating electrical machine according to claim 1, wherein the partition portion is provided at a position facing a rotor coil portion between predetermined adjacent radial ducts. .   3. The rotor of the rotating electrical machine according to claim 2, wherein a width of the narrowest portion of the partition portion in the iron core axial direction is equal to or less than a rotor coil width between the predetermined adjacent radial ducts. A rotor of a rotating electrical machine characterized by being within a range of more than half of the coil width.   The rotor of the rotating electrical machine according to any one of claims 1 to 3, wherein the partition portion includes curved surface portions that guide different cooling gases from the subslots to the predetermined adjacent radial ducts. A rotor of a rotating electrical machine that is characterized.   5. The rotor of the rotating electric machine according to claim 4, wherein a radius of curvature of the curved surface portion is equal to or greater than a width in a depth direction of the subslot and is equal to or less than a height from the bottom of the subslot to the rotor surface. A rotor of a rotating electrical machine characterized by being within a range. A multi-stage rotor coil in which field coils are stacked in a multi-ring shape around a magnetic pole in a coil slot provided at a predetermined interval in a cylindrical rotor iron core, and an outer side of the multi-stage rotor coil A plurality of supply diagonal ducts for taking cooling gas from the diameter side to the inner diameter side, and a plurality of exhaust diagonal ducts for discharging cooling gas from the inner diameter side to the outer diameter side of the plurality of stages of rotor coils, The rotor of a diagonal flow type rotating electrical machine that takes in the cooling gas from the air gap into the plurality of supply diagonal ducts and discharges the cooling gas from the plurality of exhaust diagonal ducts to the air gap to cool the plurality of stages of rotor coils. In
A plurality of subslots are disposed along the core axis direction at the inner diameter bottom portion of the coil slot, and a plurality of cooling gases are allowed to pass from the plurality of air supply diagonal ducts to the subslot through the rotor coil located closest to the inner diameter side. And a plurality of exhaust holes through which the cooling gas passes from the sub-slots to the plurality of exhaust diagonal ducts, and separate cooling gases merge in the core axis direction at predetermined positions in the sub-slots. A rotor for a rotating electrical machine, wherein a partition portion for preventing the rotation is provided.   7. The rotating electrical machine according to claim 6, wherein the partition portion is provided at a position that separates separate cooling gases flowing in from the air supply holes having different air supply directions. Rotor.   The rotor for a rotating electrical machine according to any one of claims 1 to 7, wherein the partition portion is formed as a part of the rotor core.   The rotor of the rotating electrical machine according to claim 8, wherein the sub-slot is formed by cutting a part of the rotor core so as to leave the partition portion in the core axis direction with a cutter blade having a certain curvature. A rotor of a rotating electrical machine characterized by   The rotor of the rotating electrical machine according to any one of claims 1 to 7, wherein the partition portion is formed as a member attached to a slot bottom insulating plate of the coil slot. The rotor of the rotary electric machine as described in 2.   11. A rotating electrical machine, wherein the rotor of the rotating electrical machine according to claim 1 and a stator are arranged concentrically.

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