JP2006081367A - Rotor of rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor of a highly reliable rotating electric machine which effectively and uniformly cools a rotor coil without processing ventilation grooves in the rotor coil and allows a large field current. <P>SOLUTION: The rotor of a rotating electric machine is provided with a rotor coil 1 which is laminated in a multiple ring shape centering around the magnetic pole and is fitted to the core slot provided to the rotor core, an end ring 6 which supports the rotor coil on the outside of the core, an insulation cylinder 9 which electrically insulates between the rotor coil and the end ring, and an end ring support 7 on the inner peripheral side of the end ring end, wherein interval pieces are arranged in spaces of the rotor coils in the end ring. Radial direction channels 19, 19b are constituted of the rotor coil and the interval pieces, ventilation holes 12 are provided to the insulation cylinder corresponding to the position of the channels, ventilation grooves 13 are formed on the outer peripheral surface of the insulation cylinder so that the ventilation hole are communicated, and furthermore channels from the ventilation grooves to the external surface of the rotor core is constituted. The cooling gas entered into the end ring from the end ring support inner diameter is introduced into the radial direction channel and is passed through the ventilation grooves provided to the outer periphery of the insulation cylinders 9a, 9b to be discharged to the outer surface of the rotor core. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotor of a rotating electrical machine such as a turbine generator, and more particularly to improvement of cooling performance thereof.

  In rotating electrical machines such as turbine generators, the cooling performance of the rotor coil is an important factor that affects the performance and physique of the generator. The rotor coil is provided with a ventilation groove along the longitudinal direction of the coil, and is cooled by passing cooling gas through the groove.

  FIG. 14 is a sectional view of a conventional rotor coil in the rotor axial direction, and FIG. 15 is a horizontal development view of the rotor coil. The rotor coil 1 is mounted on the iron core 3 of the rotor shaft 2 by being laminated in a multiple annular manner in slots 4 provided in the circumferential direction at predetermined intervals, and the rotor coil protrudes outward from the iron core end 5. The end of 1 is held against rotational centrifugal force by an end ring 6 and an end ring support 7.

  The rotor coil 1 in the end ring 6 is held at a predetermined interval by disposing the spacing pieces 8 between the coils, so as to maintain electrical insulation between the outermost peripheral portion of the rotor coil 1 and the end ring 6. Insulating cylinder 9 is inserted into.

  Since the field current for exciting the rotor coil 1 flows, electric heat is generated and the coil temperature rises. In the rotor coil 1, an insulator is inserted between the insulating cylinders 9 or between the stacked rotor coils (not shown), or between the iron core slot 4 and the rotor coil 1, and the heat resistance of these insulators. The upper temperature limit is defined by the above.

  Although not illustrated, the rotor coil 1 is provided with a ventilation groove in the longitudinal direction of the coil, and the cooling coil 10 is ventilated to cool the rotor coil 1.

The cooling gas 10 is introduced into the end ring 6 through the gap between the rotor shaft 2 and the end ring support 7, and a part of the cooling gas 10 is introduced into the rotor coil 1 from the ventilation intake provided on the side of the rotor coil. It is introduced into the ventilation groove. The cooling gas 10 introduced into the ventilation groove of the rotor coil 1 flows in the longitudinal direction of the rotor coil 1 through the ventilation groove to cool the rotor coil 1 and then rotates through the radial duct 11 inside the iron core. It is discharged to the outer periphery of the child.
Japanese Patent Laid-Open No. 10-336964

  In such a cooling method, it is necessary to process a ventilation groove for cooling gas ventilation for each rotor coil laminated in a multiple ring shape. For example, if the number of coil turns is 64 turns per pole in a 2-pole rotating electrical machine, 4 grooves are required per turn, and 64 turns × 2 poles × 4 = 512 grooves are required. Become. Thus, there is a problem that it takes a lot of time and cost to process a large number of grooves in the longitudinal direction of the coil.

  FIG. 16 shows the temperature distribution in the longitudinal direction in the rotor coil 1 and the rotor coil 1 of the cooling gas 10 according to the conventional method.

  In the conventional cooling method, since the cooling gas flows in the longitudinal direction of the coil, the cooling gas temperature becomes higher in the downstream of the flow, and the rotor coil temperature is also higher than the coil temperature near the center of the magnetic pole where the cooling gas inlet is located. The coil temperature near the end increases. Further, since the rotor coil becomes longer as the coil wound on the outer peripheral side, the temperature of the outer peripheral coil becomes higher than that of the inner peripheral coil. Thus, in the conventional cooling method, in the cooling method in which the ventilation coil is provided in the rotor coil, the temperature distribution is likely to increase in the axial direction and the circumferential direction of the rotor coil.

  The rotor coil temperature is severely limited by the upper temperature limit of the member used for the coil insulator. When a part with a high coil temperature is generated locally, the coil temperature at the other part is not so high, but the field temperature is high. There is a problem that the output of the rotating electrical machine cannot be increased because the amount of heat generated must be suppressed by limiting the current.

  In addition, if the coil temperature is different between a large number of coils, there is a problem in that the shaft vibration due to the unbalance of the thermal expansion of the rotor coil occurs and the generator reliability is lowered.

  Furthermore, since the ventilation groove is processed in the rotor coil, the strength of the rotor coil is reduced and the rotor coil is deformed by a strong centrifugal force, or when the ventilation groove is provided in the coil bending portion, the ventilation groove is deformed during bending. there's a possibility that.

  When the rotor coil is deformed, the insulation between the coils is locally broken and short-circuited, the predetermined performance cannot be obtained, the cross-sectional area of the ventilation channel is reduced, or a gap is generated between the laminated coils As a result, the cooling gas leaks, and the required cooling air volume cannot be secured and the rotor coil temperature becomes high.

  The present invention has been made in consideration of the above-mentioned points. The rotor coil is efficiently and uniformly cooled without processing a ventilation groove in the rotor coil, and a large field current is allowed and high reliability is achieved. It aims at providing the rotor of the rotary electric machine which has.

In order to achieve the above object, in the present invention,
A rotor coil mounted on a cylindrical rotor core at a predetermined interval and stacked in a multi-ring shape around a magnetic pole; and a rotor coil end projecting from an end of the rotor core An end ring for supporting a portion, an insulating cylinder interposed between the rotor coil and the end ring to electrically insulate between the two, and an end inner peripheral side of the end ring. An end ring support, and a plurality of rotor coil end portions arranged in the end ring in a gap between the end portions of the rotor coil. A radial flow path configured to extend along a radial direction of the rotor by the gap piece, a ventilation hole opened in the insulating cylinder corresponding to a position of the radial flow path, and the ventilation hole To communicate Ventilation grooves provided on the outer peripheral surface of the insulating cylinder, and exhaust slots formed so as to discharge cooling gas from the ventilation grooves to the outer surface of the rotor core, and from the inner diameter of the end ring support The cooling gas that has flowed into the end ring is introduced into the radial flow path, passes through the ventilation groove, and is discharged toward the outer surface of the rotor core.
With this configuration, the cooling gas flowing into the end ring through the gap between the rotor shaft and the end ring support is radially formed by the rotor coil and the spacing piece due to the centrifugal fan effect of the rotor. It is introduced into the flow path to cool the outer surface of the rotor coil. The gas that has cooled the rotor coil flows from the ventilation hole provided in the insulating cylinder to the ventilation groove provided on the outer periphery of the insulating cylinder. The cooling gas flowing into the ventilation groove flows from the end ring support side to the iron core side while flowing into the cooling core gas flowing from the ventilation holes provided along the ventilation groove, and further to the outer surface of the rotor core. Discharged.

  According to the present invention, since the ventilation path of the cooling gas for cooling the rotor coil is constituted by the rotor coil side surface and the spacing piece, it is not necessary to process the ventilation groove in the rotor coil, and the rotor coil can be easily formed. Since it can be processed and no ventilation groove is provided, the risk of deformation of the rotor coil is reduced, and a highly reliable rotor can be provided.

  Also, compared to the case where the rotor coil is provided with a ventilation groove, the length per cooling path is short, and the lengths of a plurality of cooling paths are substantially uniform, so the temperature distribution of the cooling gas is kept small. Thus, the temperature distribution in the axial direction and the circumferential direction of the rotor coil can be made uniform, and efficient design becomes possible. Further, the possibility of shaft vibration due to local thermal expansion is low, and the reliability of the generator can be improved.

  Hereinafter, several embodiments of the present invention will be described with reference to FIGS.

Embodiment 1

  FIG. 1 is a partially broken perspective view showing a configuration of a rotor of a rotating electrical machine that is Embodiment 1 of the present invention, and FIG. 2 is an axial sectional view of the rotor of the rotating electrical machine.

  The rotor coil 1 is mounted in a multi-annular manner with a predetermined interval around the magnetic pole 20 in an iron core slot 4 provided at a predetermined interval in a rotor core 3 formed integrally with the rotor shaft 2. The coil end portion protruding from the end portion of the rotor core 3 is held by the end ring 6 and the end ring support 7 so as to resist the rotational centrifugal force.

  And in order to maintain the electrical insulation between the outermost periphery part of the rotor coil 1 and the end ring 6, the insulating cylinder 9b by which the spacer 9a was stuck on the outer peripheral surface is inserted. As long as the insulating cylinder 9 has a cylindrical shape and a spacer is formed on the outer peripheral surface, the insulating cylinder 9 may have an integrated structure by groove processing without combining two members.

  The rotor coil 1 in the end ring 6 forms a plurality of radial flow paths 19 by arranging the spacing pieces 8 at regular intervals or at irregular intervals between the coils. Ventilation holes 12 (not shown in FIG. 2) are opened in the insulating cylinder 9 corresponding to the position of the radial flow path 19, and the ventilation grooves 13 are formed on the outer peripheral surface of the insulating cylinder 9 so that these ventilation holes 12 communicate with each other. Is provided. Further, the exhaust slot 14 is configured to discharge the cooling gas from the ventilation groove 13 in the outer diameter direction of the rotor core 3.

  The cooling gas 10 flows into the end ring 6 through the gap between the rotor shaft 2 and the end ring support 7, and flows in the radial direction formed by the rotor coil 1 and the spacing piece 8 by the centrifugal fan effect of the rotor. It is introduced into the path 19 and flows in the outer peripheral direction, and the outer surface of the rotor coil 1 is cooled.

  The gas 10 that has cooled the rotor coil 1 flows into the ventilation groove 13 provided on the outer periphery of the insulating cylinder 9 from the ventilation hole 12 provided in the insulating cylinder 9. The cooling gas 10 flowing into the ventilation groove 13 flows from the end ring support 7 side to the iron core 3 side through the ventilation groove 13 while joining with the cooling gas 13 flowing in from the ventilation holes 12 provided along the ventilation groove 13. The air is discharged to the outer surface of the rotor core 3 through the exhaust slot 14.

  According to the first embodiment, since the ventilation path of the cooling gas 10 for cooling the rotor coil 1 is configured by the side surface of the rotor coil 1 and the spacing piece 8, it is not necessary to provide the ventilation groove in the rotor coil 1. The processing of the rotor coil 1 is facilitated, and since no ventilation groove is provided, the risk of deformation of the rotor coil 1 is reduced, and a highly reliable rotor can be provided.

  FIG. 3 shows the temperature distribution of the cooling gas 10 passing through the rotor coil 1 and the side surface of the rotor coil 1 with respect to the distance in the longitudinal direction of the rotor coil.

  Compared with the case where the rotor coil 1 is provided with a ventilation groove, the radial flow path 19 has a short length per cooling path and the lengths of a plurality of cooling paths are substantially uniform. 3, the temperature difference between the outlet and the inlet of the radial flow path 19 of the cooling gas 10 can be reduced, and the cooling gas temperature distribution between the plurality of radial flow paths 19 can also be reduced. Therefore, the temperature distribution in the axial direction and the circumferential direction of the rotor coil 1 can be made uniform.

  The rotor coil temperature is severely limited by the upper temperature limit of the member used for the coil insulator. If a part with a high coil temperature is generated locally, the field current needs to be limited even though the coil temperature at the other part is not so high, but it becomes larger by making the temperature of the rotor coil uniform. An efficient rotor design that allows field current is possible.

  Furthermore, since the temperature distribution in the axial direction and the circumferential direction of the rotor coil is reduced, the possibility of axial vibration due to thermal expansion is low, and the reliability of the generator can be improved.

  According to the first embodiment, the ventilation groove 13 can be easily formed as compared with the case where the ventilation groove 13 is processed on the outer peripheral surface of the insulating cylinder 9, and more efficiently according to the arrangement of the ventilation holes 12. Even if it is a complicated shape so as to ventilate, it can be easily configured.

  As a modification of the first embodiment, the ventilation groove 13 is provided on the outer peripheral surface of the insulating cylinder 9 in the embodiment shown in FIG. 1, but the inner periphery of the end ring 6 so as to communicate with the ventilation hole 12 opened in the insulating cylinder. A ventilation groove 13 may be provided on the surface. The actions and effects are the same.

Embodiment 2

  4 is an axial sectional view of a rotor of a rotating electrical machine according to a second embodiment of the present invention, FIG. 5 is a horizontal development view of the rotor coil, and FIG. 6 is an axial sectional view of the rotor coil. . The description of the same configuration and effect as in FIG. 1 is omitted.

  In the second embodiment, the flow path 14 located in the core slot portion 15 among the flow paths 14 communicating so as to discharge the cooling gas 10 from the ventilation groove 13 to the outer surface of the rotor core 3 is the same as that of the rotor core 3. A closing plate 21 is attached to the inner peripheral surface of the specific radial flow path 19b located at the end to close the inflow of the cooling gas 10 from the inner diameter side.

  The specific radial flow path 19b, one or more ventilation grooves (only the ventilation path of the cooling gas 10 shown) provided in the rotor coil 1 so as to communicate with the specific radial flow path 19b, and the ventilation grooves And the radial duct 11 that communicates with the outer peripheral surface of the rotor core 3.

  According to the second embodiment, the cooling gas 10 that has passed through the ventilation groove 13 on the outer periphery of the insulating cylinder 9 located in the iron core slot portion 15 passes through the ventilation holes 12 provided in the insulating cylinder 9 to identify the core end 5. It flows into the radial flow path 19b. At this time, since the closing plate 21 is attached to the inner peripheral surface of the specific radial flow path 19b, the cooling gas 10 does not flow from the inner peripheral side, and the cooling gas 10 flows from the ventilation hole 12. There is no inhibition.

  The cooling gas 10 flowing into the specific radial flow path 19b flows into one or more ventilation grooves provided in the rotor coil 1 communicating with the specific radial flow path 19b, and further, the ventilation grooves and the rotor core. 3 is discharged to the outer surface of the iron core 3 through the radial duct 11 communicating with the outer surface of the iron core 3.

  In the second embodiment, since the ventilation path of the cooling gas 10 is not provided in the slot portion 15 of the iron core 3, the strength of the tooth tip portion of the iron core 3 is strong, and the cross-sectional area of the rotor coil 1 is smaller than that in the case of FIG. Can be bigger. The energization heat loss of the rotor, i.e., the field loss, is reduced in inverse proportion to the cross-sectional area of the coil, so that the temperature of the rotor coil 1 can be kept low and the efficiency of the rotating electrical machine is improved.

  In the second embodiment, it is necessary to process the ventilation groove in the rotor coil 1, but it is compared with the ventilation groove of the rotor coil 1 having the conventional structure shown in FIGS. 14 and 15 (only the ventilation path of the cooling gas 10 is shown). And it is short and its processing does not become a problem.

Embodiment 3

  FIG. 7 shows the configuration of the rotor in the rotating electrical machine that is Embodiment 3 of the present invention. The description of the same configuration as FIG.

  In the third embodiment, the exhaust slots 14 provided on the outer periphery of the insulating cylinder 9 are communicated with each other by the circumferential vents 17 and further communicated from the end of the rotor core 3 to the outer surface of the rotor core 3. Is provided only in the magnetic pole part 16 to form a ventilation path. In the third embodiment, the circumferential ventilation groove 17 is provided at the end portion of the insulating cylinder 9 on the end ring support 7 side, but it may be on the end portion side of the rotor core 3 or in the middle thereof.

  The cooling gas 10 that has flowed into the ventilation groove 13 whose circumferential position hits the iron core slot portion 15 merges with the cooling gas 10 that flows from the ventilation hole 12 provided along the ventilation groove 13, and changes the axial direction of the rotor. It flows toward the circumferential ventilation groove 17 and further flows through the circumferential ventilation groove 17 and into the ventilation groove 13 provided in the axial direction of the rotor of the magnetic pole portion 16.

  And it flows toward the iron core 3 while merging with the cooling gas 10 flowing in from the ventilation holes 12 provided along the ventilation grooves 13 of the magnetic pole part 16, and from the exhaust slot 14 provided in the magnetic pole part 16 to the rotor iron core 3. It is discharged to the outer surface.

  In Embodiment 3, since the ventilation path of the cooling gas 10 is not provided in the slot portion 15 of the iron core 3, the strength of the tooth tip portion of the iron core 3 is strong, and the cross-sectional area of the rotor coil 1 is smaller than that in the case of FIG. Can be bigger. The energization heat loss of the rotor, that is, the field loss is reduced in inverse proportion to the cross-sectional area of the coil, so that the temperature of the rotor coil 1 is lowered and the efficiency of the rotating electrical machine is also improved.

Embodiment 4

  FIG. 8 shows a horizontal development of an insulating cylinder of a rotor in a rotating electrical machine that is Embodiment 4 of the present invention. Other configurations are the same as those in FIG.

  In the fourth embodiment, one or a plurality of circumferential ventilation grooves 17 that communicate with the ventilation grooves 13 provided on the outer periphery of the insulating cylinder 9 are provided to configure the ventilation path. Further, in the fourth embodiment, four circumferential ventilation grooves 17 are provided, and the ventilation grooves 13 of the iron core slot portion 15 and the ventilation grooves 13 of the magnetic pole portion 16 are communicated with each other.

  According to the fourth embodiment, by providing a plurality of circumferential ventilation grooves 17, it is possible to increase the flow path cross-sectional area through which the cooling gas passes. As a result, the flow velocity of the cooling gas passing through the circumferential ventilation groove 17 is reduced, and the pressure loss due to friction is reduced. Therefore, it is possible to ventilate more cooling gas, and the rotor efficiently. The coil can be cooled.

Embodiment 5

  FIG. 9 shows a horizontal development of an insulating cylinder of a rotor in a rotating electrical machine that is Embodiment 5 of the present invention. Other configurations are the same as those in FIG.

  In the fifth embodiment, among the ventilation grooves 13 provided on the outer periphery of the insulating cylinder, the ventilation grooves 13 of the magnetic pole portion 16 are arranged in the axial direction of the rotor, and the ventilation grooves 13 of the iron core slot portion 15 are arranged in the circumferential direction. Connected to form a cooling flow path.

  According to the fifth embodiment, as compared with the fourth embodiment, the ventilation groove 13 of the iron core slot portion 15 is disposed only in the circumferential direction, so that the flow path length of the ventilation groove can be shortened. As a result, pressure loss due to friction is reduced, so that more cooling gas can be ventilated and the rotor coil can be efficiently cooled.

Embodiment 6

  FIG. 10 shows a horizontal development of an insulating cylinder of a rotor in a rotating electrical machine that is Embodiment 6 of the present invention. Other configurations are the same as those in FIG.

  In the sixth embodiment, among the ventilation grooves 13 provided on the outer periphery of the insulating cylinder, the interval between the ventilation holes 8 in the magnetic pole part 16 of the ventilation path having a long flow path length is set to the interval between the ventilation holes 8 of the shorter ventilation path. It is configured to be larger than the interval.

  The flow rate of the cooling gas 10 flowing in the ventilation path formed by the ventilation grooves 13 and the circumferential ventilation grooves 17 provided on the outer periphery of the insulating cylinder 9 is merged with the cooling gas 10 from the ventilation holes 12 as it goes downstream of the flow path. To increase. When the ventilation holes 12 are provided at regular intervals, the number of the ventilation holes 12 that join together increases in the ventilation path having a longer flow path length. For this reason, the air volume of the cooling gas 10 per one ventilation hole 12 decreases. .

  Therefore, the temperature of the rotor coil 1 corresponding to the position of the ventilation path having a long flow path length is higher than that of the rotor coil 1 at the position of the ventilation path having a short flow path length. Distribution may occur.

  In the sixth embodiment, the interval between the ventilation holes 12 at the magnetic pole portion 16 of the ventilation path having a long flow path length is made larger than the interval between the ventilation holes 12 having a shorter ventilation path. The number of ventilation holes 12 that join the long ventilation path is reduced, thereby eliminating the imbalance in the flow rate of the cooling gas 10 flowing through each ventilation hole 12 and keeping the temperature distribution difference of the rotor coil 1 small. it can.

Embodiment 7

  FIG. 11 shows the configuration of the ventilation groove provided on the outer peripheral surface of the insulating cylinder of the rotor in the rotating electrical machine according to the seventh embodiment of the present invention. Other configurations are the same as those in FIG. 1 or FIG.

  In the seventh embodiment, the size of the ventilation hole 12 arranged along the ventilation path formed by the ventilation groove 13 and the circumferential ventilation groove 17 provided on the outer periphery of the insulating cylinder 9 is set to be the size of the cooling gas flowing in the ventilation path. The upstream side is made larger.

  In the case of a flow path that joins a large number of branch pipes to the main pipe, it is known that the flow rate of the branch pipe that joins downstream becomes larger than the flow rate from the upstream branch pipe, and the flow rate of the branch pipe is unbalanced. Yes.

  Although a merge loss occurs at the place where the flows merge, when there are a large number of merges as in the ventilation path of the present invention provided on the outer periphery of the insulating cylinder 9, the cooling gas 10 flowing from the upstream ventilation holes 12 merges. Since there are many times to perform, and the merge loss that occurs each time is integrated, the pressure loss increases. Therefore, there is a possibility that the cooling gas 10 flowing from the upstream ventilation is less than the cooling gas 10 flowing from the downstream ventilation, and the flow rate is unbalanced.

  In the seventh embodiment, the size of the ventilation holes 12 disposed along the ventilation path formed by the ventilation grooves 13 provided on the outer periphery of the insulating cylinder 9 is increased toward the upstream side of the cooling gas 10 flowing through the ventilation path. . By doing in this way, the ventilation loss which arises when passing the ventilation hole 12 becomes small toward the upstream side, the imbalance of the cooling gas flow rate of each ventilation hole 12 which arises by the some of merge loss is eliminated, and the temperature of a rotor coil The difference in distribution can be kept small.

Embodiment 8

  FIG. 12 shows the structure of the ventilation groove provided on the outer peripheral surface of the rotor insulating cylinder 9 in the rotating electrical machine according to the eighth embodiment of the present invention. Other configurations are the same as those in FIG. 1 or FIG.

  In the eighth embodiment, the flow passage area of the ventilation groove 13 provided on the outer periphery of the insulating cylinder 9 is configured to increase toward the downstream of the ventilation groove 13. In the configuration of FIG. 12, the groove width of the ventilation groove 13 is increased toward the downstream of the flow path.

  Since the cooling gas 10 from the plurality of radial flow paths 19 merges with the ventilation groove 13 provided on the outer periphery of the insulating cylinder 9, the flow rate flowing through the ventilation groove 13 increases toward the downstream. Therefore, there is a possibility that the flow velocity is increased, the ventilation resistance such as friction loss is increased, and the air volume of the cooling gas 10 is decreased.

  According to the eighth embodiment, by increasing the flow passage area of the ventilation groove 13 toward the downstream side, an increase in the flow velocity can be suppressed even if the flow rate is increased, and the cooling gas 10 is efficiently ventilated to rotate the rotor coil. The temperature of 1 can be kept low.

Embodiment 9

  FIG. 13 shows the structure of the ventilation groove provided on the outer peripheral surface of the insulating cylinder of the rotor in the rotating electrical machine according to the ninth embodiment of the present invention. Other configurations are the same as those in FIG. 1 or FIG.

  In the ninth embodiment, the depression 18 is provided on the side surface of the ventilation groove 13 provided on the outer peripheral surface of the insulating cylinder 9, and the ventilation hole 8 that communicates the radial flow path 19 and the ventilation groove 13 is disposed in the depression 19.

  According to the ninth embodiment, the cooling gas 10 flowing into the ventilation groove 13 on the outer peripheral surface of the insulating cylinder 9 through the ventilation hole 12 does not directly flow into the cooling gas 10 flowing through the ventilation groove 13, thereby reducing the merging loss. The cooling gas 10 can be efficiently ventilated to keep the temperature of the rotor coil 1 low.

1 is a partially broken perspective view showing a rotor of a rotating electrical machine that is Embodiment 1 of the present invention. FIG. 1 is an axial sectional view of Embodiment 1 of the present invention. The longitudinal direction temperature distribution map of Embodiment 1 of the present invention. 1 is an axial sectional view of Embodiment 1 of the present invention. The horizontal expanded view of the rotor coil of the rotor of the rotary electric machine which is Embodiment 2 of this invention. The axial direction sectional view of Embodiment 2 of the present invention. The partially broken perspective view which shows the rotor of the rotary electric machine which is Embodiment 3 of this invention. The horizontal expanded view of the insulation cylinder of the rotor of the rotary electric machine which is Embodiment 4 of this invention. The horizontal expanded view of the insulation cylinder of the rotor of the rotary electric machine which is Embodiment 5 of this invention. The horizontal expanded view of the insulation cylinder of the rotor of the rotary electric machine which is Embodiment 6 of this invention. The block diagram of the ventilation groove | channel provided in the insulating cylinder outer peripheral surface of the rotor of the rotary electric machine which is Embodiment 7 of this invention. The block diagram of the ventilation groove | channel provided in the insulating cylinder outer peripheral surface of the rotor of the rotary electric machine which is Embodiment 8 of this invention. The block diagram of the ventilation groove | channel provided in the insulating cylinder outer peripheral surface of the rotor of the rotary electric machine which is Embodiment 9 of this invention. The axial direction sectional view which shows the structure of the rotor of the conventional rotary electric machine. The horizontal direction expanded view of the rotor coil of the conventional rotary electric machine. The longitudinal direction temperature distribution figure of the rotor coil of the conventional rotary electric machine.

Explanation of symbols

1 rotor coil, 2 rotor shaft, 3 core, 4 core slot, 5 core end,
6 End ring, 7 Centering ring, 8 Spacing piece, 9a, 9b Insulating tube,
10 cooling gas, 11 radial duct, 12 ventilation holes, 13 ventilation grooves,
14 exhaust slot, 15 core slot, 16 magnetic pole, 17 circumferential ventilation groove,
18 Dent for vent hole arrangement, 19 radial flow path, 19b specific radial flow path, 20 magnetic pole, 21 closing plate.

Claims (13)

A rotor coil mounted on a cylindrical rotor core at a predetermined interval and stacked in a multi-ring shape around a magnetic pole; and a rotor coil end projecting from an end of the rotor core An end ring for supporting a portion, an insulating cylinder interposed between the rotor coil and the end ring to electrically insulate between the two, and an end inner peripheral side of the end ring. A rotor of a rotating electrical machine comprising a plurality of end ring supports and spacing pieces arranged in a gap between the end portions of the rotor coils arranged in multiple in the end ring.
A radial flow path configured to extend along the radial direction of the rotor by the rotor coil end and the spacing piece;
Ventilation holes opened in the insulating cylinder corresponding to the position of the radial flow path,
A ventilation groove provided on an outer peripheral surface of the insulating cylinder so that the ventilation hole communicates;
An exhaust slot formed to discharge cooling gas from the ventilation groove to the outer surface of the rotor core;
Cooling gas that has flowed into the end ring from the inner diameter of the end ring support is introduced into the radial flow path, discharged through the ventilation groove toward the outer surface of the rotor core. The rotor of the rotating electrical machine. The rotor of the rotating electrical machine according to claim 1,
The insulating cylinder is cylindrical, and the ventilation groove is configured by attaching a partition block to an outer peripheral surface of the insulating cylinder. In the rotor of the rotating electrical machine according to claim 1 or 2,
Of the exhaust slots communicating so as to discharge cooling gas from the ventilation groove to the outer surface of the rotor core, the flow path located in the rotor core slot portion is,
A specific radial flow path at a position in contact with an end of the rotor core in the radial flow path;
A closing plate attached to the inner peripheral surface of the specific radial flow path;
At least one ventilation groove provided in a rotor coil so as to communicate with the specific radial flow path;
A rotor of a rotating electrical machine, comprising: a radial duct that communicates the ventilation groove and the outer peripheral surface of the rotor core. In the rotor of the rotating electrical machine according to claim 1 or 2,
The ventilation groove is constituted by an axial ventilation groove of the rotor and a circumferential ventilation groove for communicating them, and communicates from the axial ventilation groove of the rotor to the outer surface of the rotor core. The flow path to be made is provided only in the magnetic pole part to constitute the ventilation path,
The cooling gas introduced into the ventilation groove from the radial flow path through the ventilation hole is discharged from the magnetic pole portion to the outer diameter of the rotor core. . The rotor of the rotating electrical machine according to claim 4,
A rotor of a rotating electrical machine, wherein a plurality of circumferential ventilation grooves communicating with the ventilation grooves are provided. In the rotor of the rotating electrical machine according to claim 4,
The rotor of the rotating electrical machine is characterized in that the ventilation groove of the magnetic pole portion is disposed in the axial direction of the rotor and the ventilation groove of the iron core slot portion is disposed in the circumferential direction and connected to each other to form a cooling flow path. In the rotor of the rotary electric machine according to any one of claims 4 to 6,
Among the ventilation paths constituted by the ventilation grooves, the distance between the ventilation holes communicating with the ventilation grooves of the magnetic pole part in the long ventilation path is the distance between the ventilation holes communicating with the ventilation grooves of the magnetic pole part in the short ventilation path. A rotor of a rotating electrical machine characterized by being made larger than the above. In the rotor of the rotary electric machine according to any one of claims 1 to 7,
The rotating electrical machine characterized in that the size of the ventilation holes arranged along the ventilation path constituted by the ventilation grooves is increased toward the upstream side of the ventilation path for each or a plurality of ventilation holes. Rotor. The rotor for a rotating electrical machine according to any one of claims 1 to 8,
The rotor of a rotating electrical machine, wherein the flow passage area of the ventilation groove is increased toward the downstream of the flow passage. The rotor of the rotating electrical machine according to claim 9,
The rotor of the rotating electrical machine, wherein the flow channel area of the ventilation groove is increased by increasing the depth of the ventilation groove toward the downstream of the flow path. In the rotor of the rotary electric machine according to claim 9 or 10,
The rotor of the rotating electrical machine, wherein the flow passage area of the ventilation groove is increased by increasing the groove width of the ventilation groove toward the downstream of the flow path. In the rotor of the rotary electric machine according to any one of claims 1 to 11,
A dimple is provided in a side surface of a ventilation groove provided on the outer peripheral surface of the insulating cylinder, and the ventilation hole for communicating the radial flow path and the ventilation groove is arranged in the depression. Rotor.   A rotating electrical machine comprising the rotor of the rotating electrical machine according to any one of claims 1 to 12.

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