JP2019047679A - Rotary electric machine and manufacturing method of the same - Google Patents

Abstract

To simplify an assembly operation while having a structure which can be decomposed after the assembly without irreversible deformation of wedge.SOLUTION: A rotary electric machine comprises: a rotator to which a plurality of slots extended to an axial direction in an outer periphery is provided; a plurality of wedges which is housed to an outer peripheral side of a radial direction of each slot, and includes an end part wedge 12A arranged to an end part of the axial direction and a rotor wedge 15 other than the end part wedge 12A; a plurality of creepage blocks 14 housed in each slot so as to be adjacent to an inner peripheral side of the radial direction of the rotor wedge 15; and an end ring 11 arranged to the end part of the rotator. The end part wedge 12A comprises a stopper part 12A that is fixed to the end ring 11 and contacts the creepage block 14 to the axial direction. The rotor wedge 15 is fixed to the axial direction by the creepage block 14.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a rotating electrical machine and a method for manufacturing the same.

  A rotating electric machine, in particular a turbine generator, is a horizontal axis type synchronous generator in which the direction of a rotating shaft is horizontal. In the rotor (rotor), a groove (slot) is machined along the axial direction with respect to the rotor shaft that is a rotating shaft, and a rotor coil through which a field current flows is incorporated in the slot. . In order to hold the rotor coil, a wedge (rotor wedge) is inserted into the upper portion of the slot to fix the coil. The wedge is divided in the slot along the axial direction, and a gap is provided between adjacent wedges. The reason why the wedge is divided is that it is difficult to make a long one in manufacturing the wedge. The reason why a suitable gap is ensured between the wedges is to prevent a binding force from being generated between the wedges when the wedges are deformed by heat spread during operation.

  In such a structure, if the movement of the wedge in the axial direction is not suppressed, the wedge may move during operation, and the gap between the wedges may change. If the gap change, that is, the amount of movement of the wedge is large, the position of the cooling ventilation hole in the coil and the wedge may shift and the hole may be blocked, resulting in problems such as vibration due to thermal imbalance. There is. Therefore, it is necessary to manage the gap between the wedges so that the movement of the wedge in the axial direction is suppressed by some method and the cooling ventilation hole is kept penetrating during assembly.

  As a method for managing the gap of the rotor wedge, fixing by punch lock (coking) has been conventionally performed. As the method, there are known a method in which a wedge is struck and deformed in accordance with a recess provided beside the slot of the rotor shaft, and a method in which the wedges are connected with a spring or the like.

  In addition, since an insulator called a crimp page block is interposed between the wedge and the coil, as a method of positioning the wedge in the axial direction by the clip page block, a leaf spring shaped member is attached to the clip page block, A method of restraining the wedge by applying a surface pressure to the end of the wedge is known.

  When trying to fix the axial direction with such a structure, the contact surface pressure between the shaft and the wedge may increase, and the slip of the wedge may worsen, which may cause thermal deformation and thermal stress. Therefore, there is a need for a technique for keeping the axial gap constant without pressing the wedge in the cross-sectional direction of the rotor.

JP 2011-229336 A Japanese Patent Laid-Open No. 11-046463 Japanese Patent Laid-Open No. 11-178261

  As described above, when the method of fixing by punch lock (caulking) is applied to a rotor having a short wedge in which the individual wedge has a short axial length and has a large number of gaps in the slot, it is necessary to work. There was a problem of increasing the number of items and making them complicated.

  The problem to be solved by the present invention is to provide a rotating electrical machine capable of simplifying assembling work and a method of manufacturing the same, with a structure that is not accompanied by irreversible deformation of the wedge and can be disassembled after assembling. With the goal.

  According to the rotating electrical machine of the embodiment, the rotor provided with a plurality of slots extending in the axial direction on the outer periphery, and the end portions that are respectively housed on the radially outer peripheral side of the slots and disposed at the end portions in the axial direction A plurality of wedges including a wedge and a rotor wedge other than the end wedge; a plurality of clipper blocks which are accommodated in the slots adjacent to the radially inner circumferential side of the rotor wedge; and an end of the rotor An end ring disposed at a portion, the end wedge includes a stopper portion fixed to the end ring and abutting the clip page block in the axial direction, and the rotor wedge is axially driven by the clip page block. Fixed to.

  Further, according to the manufacturing method of the rotating electrical machine of the embodiment, a plurality of slots extending in the axial direction are processed on the outer periphery of the rotor, and a plurality of clip page blocks are accommodated in the slots, and are arranged at the end portions in the axial direction. A plurality of wedges including an end wedge and a rotor wedge other than the end wedge are accommodated adjacent to the radial outer peripheral side of the clip page block of the slot, and an end ring is provided at the end of the rotor. Thus, the end wedge is fixed and the clip page block is positioned in the axial direction, and the rotor wedge is positioned in the axial direction by the clip page block.

  According to each embodiment of the present invention, it is possible to prevent irreversible deformation of the wedge and simplify the assembling / disassembling work.

The figure which shows the structure by the side of the edge part especially of the rotary electric machine of embodiment. The figure which shows the specific structure of the clear page block and rotor wedge in the 1st Example which concerns on the embodiment. The figure which shows the specific structure of the clear page block and rotor wedge in the 1st Example which concerns on the embodiment. The figure which shows the specific structure of the clear page block and rotor wedge in the 2nd Example which concerns on the embodiment. The figure which shows the specific structure of the clear page block and rotor wedge in the 2nd Example which concerns on the embodiment. The figure which shows the specific structure of the clear page block and rotor wedge in the 3rd Example which concerns on the embodiment. The figure which shows the specific structure of the clear page block and rotor wedge in the 3rd Example which concerns on the embodiment. The figure which shows the specific structure of the clear page block and rotor wedge in the 4th Example which concerns on the embodiment.

  Hereinafter, the rotating electrical machine of the present embodiment will be described in detail with reference to the drawings.

  FIG. 1 shows a configuration of a core end portion 10 of a rotor, in particular, of the rotating electrical machine according to the embodiment, and FIG. 1B is a cross-sectional view along the direction of the rotation axis, FIG. FIG. 2 is a diagram mainly showing a relationship between a clear page block 14 and a rotor wedge 15 along the line II in FIG. 1B.

  A plurality of slots extending in the axial direction of the rotor are processed and provided on the outer periphery of the rotor. On the outer peripheral side of each slot of the rotor, a wedge is arranged to fix and position the coil accommodated in the slot in the radial direction. That is, the wedge is accommodated and provided on the outer peripheral side in the radial direction of each slot.

  The wedge accommodated in each slot includes an end wedge 12 disposed at an axial end portion and a rotor wedge 15 other than the end wedge 12. An end ring 11 is fixed to the core end 10 which is both ends of the rotor on which the end wedge 12 is disposed. An end ring key 11A is attached to the end ring 11 so that the end wedge 12 is axially attached. It adopts a structure for positioning.

  In each slot, the clear page block 14 is accommodated adjacent to the rotor wedge 15 on the radially inner peripheral side of the rotor wedge 15. The clear page block 14 is an insulator for insulating the rotor wedge 15 from the coil disposed in the slot, and a plurality of the clear page blocks 14 are disposed in the slots in the axial direction.

  In other words, a plurality of rotor wedges 15 are arranged adjacent to the clip page block 14 on the radially outer peripheral side of the clip page block 14 in the slot. Unlike the other rotor wedges 15 arranged in the same slot, the end wedge 12 has a stopper portion 12A for protruding the crimping block 14 in the axial direction on the inner diameter direction side of the slot. With this stopper portion 12A, the clear page block 14 positioned adjacent to the inner diameter side of the rotor wedge 15 in the slot is positioned in the axial direction.

  An insulator (not shown) is provided on the radially inner side of the stopper portion 12A so that the stopper portion 12A is not in contact with the coil accommodated in the slot.

  At the lower portion (inner diameter side of the slot) of the end ring 11, a clear page block 13 at the end portion is attached in a state of having a sufficient space in the axial direction from the stopper portion 12 </ b> A of the rotor wedge 12. The end clipboard block 13 is provided adjacent to the radially inner periphery of the end wedge 12 (that is, the end wedge 12 is adjacent to the radially outer periphery of the end clipet block 13). Arranged).

  Both the clear page block 14 and the clear page block 13 at the end are arranged as insulating members on the outer peripheral side of a coil in a slot not shown here.

  A plurality of clip page blocks 14 are continuously arranged in the slot without a gap, and a plurality of rotors are arranged adjacent to the radially outer peripheral side of the clip page block 14 in each slot. The wedge 15 is fixed to the slot in a state in which the wedge 15 is fixed to the clip page block 14 while maintaining a predetermined interval in the axial direction.

  In the configuration as described above, the position of the clip page block 13 at the end along the rotor axial direction is affected by the assembly gap of an insulating cylinder (not shown) fixed under the end ring 11. Therefore, it is installed at an interval from another clip page block 14.

  However, the clear page block 14 adjacent to the clear page block 13 at the end is arranged so that one end surface thereof is in contact with the stopper portion 12A of the end wedge 12 in the axial direction.

  Further, although not shown in the drawing, an arrangement of a series of clip page blocks 14 is formed by sequentially arranging the clip page blocks 14 on the inner circumference side from the clip page blocks 14 on the outer circumference side in the slot. The block 14 is positioned in the axial direction.

  That is, in this embodiment, when the end wedge 12 is fixed in the axial direction by the end ring 11 at the end of the rotor, the clear page block 14 comes into contact with the stopper portion 12A of the end wedge 12 so that each clear page block 14 is positioned in the axial direction.

  Therefore, the clear page block 14 other than the clear page block 13 at the end is not affected by the position of the clear page block 13 at the end, and as a result, the clear page block 14 has a predetermined interval between them. The plurality of rotor wedges 15 can be properly fixed while being maintained.

Hereinafter, a specific configuration for fixing the rotor wedge 15 to an accurate position with respect to the clear page block 14 will be described using first to fourth embodiments.
(First embodiment)
2 and 3 show specific configurations of the clear page block 14 and the rotor wedge 15 according to the first example of the present embodiment. In FIG. 2, the II-II ′ line indicates the axial direction of the rotor.

  FIG. 2 shows a state where the rotor wedge 15-1 is assembled and fixed to the clear page block 14-1. FIG. 3 shows a process for assembling the rotor wedge 15-1 to the clear page block 14-1 inserted in the slot of the rotor.

  As shown in the drawing, the contact surface between the clip page block 14-1 and the rotor wedge 15-1 has a stepped structure having step surfaces 14a, 15a orthogonal to the axial direction of the rotor on one end (II ') side. Adopted.

  Therefore, the structure is particularly suitable when the structure of the clip page block 14-1 and the rotor wedge 15-1 is disposed at a position adjacent to the rotor wedge 12 at the end of the rotor.

  In this case, the clear page block 14-1 and the rotor wedge 15-1 are arranged so that the end surface (II) side that does not adopt the stepped structure is in contact with the rotor wedge 12 and its stopper portion 12A. Thus, the positions of the clear page block 14-1 and the rotor wedge 15-1 in the axial direction along the slot of the rotor can be determined according to the end wedge 12. In addition, the stepped structure can reliably prevent the rotor wedge 15-1 from moving toward the inner peripheral side (II ') in the axial direction of the rotor.

  2 and 3, the example of the structure in which the stepped structure is formed only on one end face side is described. However, the stepped structure is also formed on the other end face (II) side corresponding to the axial direction of the rotor. It is good also as what is done.

  As a result, the rotor wedge 15-1 fixed to the clip page block 14-1 disposed on the inner peripheral side other than the clip page block 14-1 adjacent to the end wedge 12 at the rotor end is provided. Thus, it is possible to reliably prevent the rotor from moving in both the inner and outer circumferences in the axial direction.

(Second embodiment)
4 and 5 show specific configurations of the clear page block 14 and the rotor wedge 15 according to the second example of the present embodiment.

  FIG. 4 shows a process when the rotor wedge 15-2 is assembled to the clear page block 14-2. FIG. 5 shows a state where the rotor wedge 15-2 is assembled and fixed to the clip page block 14-2 inserted into the slot of the rotor, using a cross section of the clip page block 14-2.

  As shown in the drawing, a substantially cylindrical protrusion 15b is formed on the rotor wedge 15-2 side on the contact surface between the clip page block 14-2 and the rotor wedge 15-2, and on the clip page block 14-2 side. A substantially cylindrical recess 14b that fits with the protrusion 15b is formed.

  Therefore, by positioning the rotor wedge 15-2 so that the convex portion 15b is aligned with the concave portion 14b with respect to the clear page block 14-2 arranged in the slot of the rotor, it is extremely easy and accurate. The rotor wedge 15 can be positioned.

  4 and 5, the convex portion 15b and the concave portion 14b are located approximately at the center of the joint surface between the rotor wedge 15-2 and the clip page block 14-2. However, the rotor wedge 15- When the ventilation holes for cooling the rotor of the rotor are respectively formed in the 2 and the clear page block 14-2, the protrusions 15b and the recesses 14b are formed at positions avoiding the ventilation holes. The

  Moreover, the number of sets of the convex portions 15b and the concave portions 14b formed on the joint surface between one rotor wedge 15-2 and the clip page block 14-2 is not limited to one, and a plurality of sets may be formed. Good.

  As described above, in both the first and second embodiments, simple work is achieved by fitting the concave and convex shapes formed on the clip page blocks 14-1 and 14-2 and the rotor wedges 15-1 and 15-2 themselves. Thus, the rotor wedge 15 can be assembled to the clip page block 14 easily and accurately.

(Third embodiment)
6 and 7 show specific configurations of the clear page block 14 and the rotor wedge 15 according to the third example of the present embodiment. FIG. 6 shows a state where the rotor wedge 15-3 is assembled and fixed to the clip page block 14-3. FIG. 7 shows the process of assembling the rotor wedge 15-3 to the clear page block 14-3 inserted into the slot of the rotor.

  As shown in FIG. 6, a through hole 15c is formed in the center of the outer peripheral surface of the rotor wedge 15-3 in a state where the rotor wedge 15-3 is assembled to the clip page block 14-3. As shown in FIG. 7, the through-hole 15c has a two-stage configuration with a larger inner diameter on the internal clear page block 14-3 side, and a corresponding position on the clear page block 14-3 side has A bottomed cylindrical cylindrical recess 14c having an inner diameter equal to the larger inner diameter is formed.

  When the rotor wedge 15-3 is assembled to the clear page block 14-3, the rotor wedge 15-3 is positioned at an appropriate position of the clear page block 14-3, and the through hole 15c of the rotor wedge 15-3 is provided. The cylindrical recess 14c of the clear page block 14-3 is arranged on the same axis.

  In this state, it has an axial length corresponding to the sum of the depth of the cylindrical recess 14c of the clip page block 14-3 and the axial length of the large diameter side portion of the through hole 15c of the rotor wedge 15-3. The ring member 21 having a C-shaped cross section in which a notch is formed in the axial direction is inserted into the through hole 15c of the rotor wedge 15 as indicated by an arrow VII in the drawing.

  The ring member 21 is made of, for example, spring steel having flexibility and resilience, and the outer diameter in an unpressurized state is the inner diameter on the large diameter side of the through hole 15c of the rotor wedge 15-3, and It is set slightly larger than the inner diameter of the cylindrical recess 14c of the clip page block 14-3.

  Therefore, the ring member 21 is bent from the through hole 15c in a state where the outer diameter of the ring member 21 is temporarily bent by applying pressure so that the outer diameter of the ring member 21 is temporarily smaller than the inner diameter on the small diameter side of the through hole 15c. Insert. Thereafter, the crimping block 14-3 and the rotor wedge 15-3 are integrally fixed by press-fitting until the ring member 21 comes into contact with the innermost portion, due to the restoring property of the ring member 21 itself. .

  By using a member such as the ring member 21 in this way, the rotor wedge 15-3 can be easily assembled to the clip page block 14-3.

  In the description of FIG. 7 described above, the cylindrical concave portion 14c of the clip page block 14-3 is described as having a bottomed cylindrical shape, but the clip page block 14-3 includes the rotor wedge 15-3 and the rotor. In the structure having the cooling through hole, the structure described with reference to FIGS. 6 and 7 is set to the cooling through hole by setting the cylindrical recess 14c to have a larger diameter than the cooling through hole. It can be set as the structure which shared the part.

(Fourth embodiment)
FIG. 8 shows a specific configuration of the clear page block 14 and the rotor wedge 15 according to the fourth example of the present embodiment. 8A and 8B show a state where the rotor wedge 15-4 is assembled and fixed to the clip page block 14-4. 8A is a view of the assembled rotor wedge 15-4 as seen from the surface of the rotor shaft 22, and FIG. 8B is a sectional structure taken along line VIII-VIII in FIG. Yes.

  A clear page block 14-4 is arranged on the rotor coil 23 in the slot of the rotor shaft 22. A rotor wedge 15-4 is arranged so as to sandwich the clip page block 14-4.

  Both the clear page block 14-4 and the rotor wedge 15-4 have through holes, and the cylindrical sleeve 24 is inserted therein. The lower side of the through-hole of the clear page block 14-4 constitutes a stopper portion having a stepped structure having a smaller diameter than the outer diameter of the cylindrical sleeve 24, thereby avoiding contact between the cylindrical sleeve 24 and the rotor coil 23. doing.

  The cylindrical sleeve 24 may be made of an insulating material such as a resin in addition to metal. When the cylindrical sleeve 24 is made of an insulating material, the lower side of the through hole of the clear page block 14-4 is provided. Such a stepped structure may not be used.

  Further, the upper side of the through hole of the rotor wedge 15-4 is larger than the outer diameter of the cylindrical sleeve 24, and a thread is formed on the inner peripheral surface thereof. A screw member 25 having a hexagonal hole having a thread formed on the outer peripheral surface is screwed onto an upper portion of the through hole of the rotor wedge 15-4.

  The rotor sleeve 15-4 is positioned with respect to the clip page block 14-4 by the cylindrical sleeve 24, and the cylinder sleeve 24 is pressed by the screw member 25 to prevent the cylinder sleeve 24 from falling off. The rotor wedge 15 is securely fixed.

  Through the rotor coil 23, a cooling through hole is formed by the clip page block 14-4, the rotor wedge 15-4, the cylindrical sleeve 24, and the screw member 25.

  By adopting such a configuration, it is not necessary to perform the work of bending by applying pressure so that the outer diameter of the ring member 21 is reduced by using a tool or the like described in the third embodiment. In the state where the clip page block 14-4 and the rotor wedge 15-4 are positioned by the cylindrical sleeve 24, the fixing is executed by screwing using the screw member 25. Therefore, workability is high and not only can attachment be performed reliably, but also removal work at the time of maintenance becomes easy.

  As described above, in the third and fourth embodiments, the ring member 21 or the ring-shaped member such as the cylindrical sleeve 24 and the screw member 25 is used to consider the existence of the cooling through hole including the rotor coil 23. More accurate positioning and fixing can be realized.

  As described above in detail, according to the present embodiment, it is possible to simplify the assembling work while having a structure that can be disassembled after assembling without irreversible deformation of the wedge as in caulking.

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

  DESCRIPTION OF SYMBOLS 10 ... Core edge part, 11 ... End ring, 11A ... End ring key, 12 ... End wedge, 12A ... Stopper part, 13 ... Clear page block of (end part), 14, 14-1 to 14-4 ... Chest Page block, 15, 15-1 to 15-4 ... rotor wedge, 21 ... ring member, 22 ... rotor shaft, 23 ... rotor coil, 24 ... cylindrical sleeve, 25 ... (with hexagonal hole) screw member

Claims (6)

A rotor provided with a plurality of axially extending slots on the outer periphery;
A plurality of wedges each housed on the radially outer periphery of the slot and including an end wedge disposed at an axial end and a rotor wedge other than the end wedge;
A plurality of clip page blocks which are accommodated in the slots adjacent to the radially inner circumferential side of the rotor wedge;
An end ring disposed at an end of the rotor,
The end wedge includes a stopper portion fixed to the end ring and abutting the clip page block in the axial direction.
The rotor wedge is fixed in the axial direction by the clip page block.
Rotating electric machine.   The rotating electrical machine according to claim 1, wherein the rotor wedge and the cripage block adjacent in the radial direction have a concavo-convex shape formed so as to be fitted to each other.   2. The rotating electrical machine according to claim 1, wherein each of the rotor wedge and the cripage block adjacent in the radial direction includes a radial hole formed in the radial direction and a ring-shaped member inserted into the radial hole.   The rotating electrical machine according to claim 3, wherein the ring-shaped member has a partially cutout portion along an axial direction on a circumferential surface thereof.   The rotating electrical machine according to claim 3, wherein the ring-shaped member is fixed in the radial hole by a screw member screwed into the rotor wedge. Machining a plurality of axially extending slots on the outer periphery of the rotor;
A plurality of clip page blocks are accommodated in the slot,
A plurality of wedges including an end wedge disposed at an end in the axial direction and a rotor wedge other than the end wedge are accommodated adjacent to the radially outer peripheral side of the clip page block of the slot,
Fixing the end wedge by an end ring at the end of the rotor and positioning the clip page block in the axial direction;
The rotor wedge is positioned in the axial direction by the clip page block.
A method of manufacturing a rotating electrical machine.