JPH0880000A - Rotor for dynamo-electric machine - Google Patents

Abstract

PURPOSE: To prevent the damage of an armor at the time of assembling or rotating a rotor and to facilitate the assembling operation by disposing a flat platelike underlay plate between the armor on the bottom of the coil slot of the rotor and the coil conductor of the lowermost part. CONSTITUTION: Many coil slots 2 are formed along the axial direction on a rotor core 1, and a coil conductor 3 made of a flat type copper is wound in many superpositions while electrically insulating via a turn insulator 4 to form a rotor coil 5. In order to insulate the conductor 3 to the earth, an insulation armor 6 is so inserted between the inner surface of the slot 2 and the conductor 3 as to enclose the conductor 3. The armor 6 is split at the bottom of the slot, and formed in an L shape. An underlay plate 7 made of a banded insulator is laid between the armor 6 of the bottom of the coil and the conductor 3 of the lowermost part. A creepage block 9 and a rotor wedge 8 are engaged with the outside of the conductor 3. Thus, the assembling is efficiently conducted, and the damage of the armor is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric machine rotor having improved reliability in a cylindrical rotary electric machine such as a turbine generator.

[0002]

2. Description of the Related Art In a large cylindrical rotating electric machine that rotates at a high speed like a turbine generator, as shown in FIGS. 2 and 3, the central portion of the rotor shaft is thickened to form a rotor core 1, and A large number of coil slots 2 are formed along the axial direction, and a coil conductor 3 is provided between these coil slots.
The rotor coil 5 is formed by being wound in multiple layers while being insulated by inserting the turn insulation 4. Further, to insulate the coil conductor 3 from the ground, an insulating armor 6 is inserted between the coil slot 2 and the coil conductor 3 so as to wrap the coil conductor 3. Since the armor 6 is divided at the bottom of the coil slot and is formed into an L shape, an underlay plate 7 made of a strip-shaped insulator is laid between the armor 6 and the bottom of the coil slot to secure an insulation distance. I have to. In the figure, 8 indicates a rotor wedge, and 9 indicates a cripage block.

By the way, it is very difficult to wind the rotor coil compactly around the rotor shaft, and the coil conductor is subjected to some severe bending, shaping and straightening, especially at the end of the rotor core. Even for the armor that encloses the coil conductor, an unbelievably large load is applied during normal rotation. Also, if the bottom of the coil conductor becomes a local protrusion, centrifugal force of the armor itself may be applied during rotation, and the armor may be deformed or damaged, especially if the L-shaped corner of the armor is pulled. Since bending load is applied, it is easily damaged.

Next, a conventional technique relating to the second invention of the present invention will be described.

In a large-sized cylindrical rotating electric machine such as a turbine generator, a so-called direct cooling system is widely adopted in which the coil winding is directly brought into contact with a cooling gas to cool the rotor coil. . There are various direct cooling methods, but the radial flow method is 3,000 rp because of its simple structure but good cooling efficiency.
It is widely used for medium-capacity thermal power turbine generators of about m or 3,600 rpm, large-capacity nuclear turbine generators of about 1,500 rpm or 1,800 rpm.

As shown in FIG. 4 and FIG. 5, the rotor of this radial flow type rotary electric machine is provided with a sub-slot 10 at the bottom of the coil slot 2, a bottom plate 7, a bottom of the armor 6, and a rotor coil. 3, the turn insulation 4, the cripage block 9, and the rotor wedge 8 are provided with a plurality of coil ventilation holes at appropriate intervals over almost the entire length of the rotor core 1 so as to penetrate them. Radial pass 1
1, the radial path 11 and the sub-slot 10 are communicated with each other. In this case, as shown by an outline arrow in FIG. 4, while the cooling gas is introduced from the rotor core end 1a into the sub-slot 10 to flow the cooling gas toward the central portion of the rotor core 1, Due to the centrifugal fan effect due to the rotation, the cooling gas is branched to each radial path 11 in order, the cooling gas passing through each radial path 11 absorbs the heat generation amount of the rotor coil 3, and then the cooling gas is supplied to the air gap. Is discharged. In addition, in FIG. 4, 12 shows a retaining ring.

In the radial flow type rotary electric machine described above, when cooling gas is branched from the sub-slot 10 to each radial path 11, pressure loss, so-called branch loss occurs. When the flow velocity of the main stream is high, this branch loss tends to increase the branch loss of the tributary because the static pressure of the main stream becomes low and the flow of the branch tributary is blocked. Further, the flow velocity in the sub-slot, which is the main flow of the branch flow, is high in the vicinity of the core end 1a, and as shown in FIG. The flow velocity inside is small. For the above reasons, the radial flow type rotary electric machine
The cooling gas flow rate of the radial path 11 near the rotor core end 1a tends to be smaller than the cooling gas flow rate of the radial path 11 at the center of the core. Therefore, the solid line T1 in FIG.
As shown in, the temperature distribution in the longitudinal direction of the rotor coil becomes non-uniform, and the temperature in the vicinity of the rotor core end portion 1a becomes higher than in the rotor core central portion 1b, resulting in the maximum allowable field current, in other words, If so, there is a drawback that the ability of the rotor is restricted.

As an improved technique for reducing the non-uniformity of the flow rate distribution of each radial path, as shown in FIG. 8, a method of reducing the depth of the sub-slot 10 near the rotor core central portion 1b, or FIG. As shown in FIG. 11, it is possible to change the cross-sectional shape of the sub-slot 10 according to the axial position so that the cross-sectional area of the sub-slot is smaller near the rotor core central portion 1b than near the end portion 1a. It is known.

According to these methods, since the ventilation loss in the sub-slot 10 near the rotor core central portion 1b increases, the air volume of the radial path near the core central portion 1b decreases, and as a result, the iron core end portion 1a. Since the amount of airflow in the radial path in the vicinity of increases, the temperature distribution in the longitudinal direction of the rotor coil can be made uniform.

However, these improved methods have the following drawbacks. That is, the method of FIG. 8 has a drawback that the total ventilation of the cooling gas flowing into the sub-slot 10 is reduced, and even if the maximum temperature can be reduced by uniforming the temperature distribution in the longitudinal direction of the rotor coil, the rotation is reduced. The average temperature of the child coil rather rises, and particularly in the case of a rotor having a long rotor core, the vibration characteristics during rotation are deteriorated due to thermal expansion of the rotor coil when the rotor is energized. In addition, for the rotor coil maximum temperature reduction effect itself, in a rotor with a long rotor core, in order to obtain a sufficient effect to further improve the rotor performance, the total air volume flowing into the sub-slots must be reduced. There was a need to improve the drawback of doing. In order to increase the total air volume that flows into the sub-slot, increase the cross-sectional area of the sub-slot near the end of the rotor core and reduce the wind speed of the cooling gas in that sub-slot to suppress the ventilation loss. However, if an attempt is made to increase the depth of the sub-slot to achieve this, the stress acting on the central part of the rotor core cross section due to centrifugal force and the teeth sandwiched between the slots of the rotor core There is a drawback in that the stress at the tooth base at the base of the portion increases and the mechanical strength of the rotor decreases, in other words, the reliability decreases.

As an alternative to the above, the method shown in FIGS. 9 to 11 was devised, but in this case, there was a drawback that machining was extremely difficult and the processing time was increased.

As described above, when a radial flow type ventilation cooling system is adopted for a rotor having a long iron core, it is impossible to select a large field current value in the prior art.
The improvement of the sub-slot as this improvement measure was not effective either. Therefore, it is necessary to improve the cooling capacity of the radial flow type rotor by improving the parts other than the sub-slot part.

Next, the prior art relating to the third aspect of the present invention will be described. As described with reference to FIGS. 3 and 4, a cylindrical rotor having a general rotating field winding has a rotor core having a thick center portion to form a rotor core 1, and the rotor core 1 is provided along the axial direction. A large number of coil slots 2 are formed, and the coil conductors 3 are insulated by the turn insulation 4 between these coil slots while being laminated in multiple layers to form a rotor coil 5. . In this case, in order to prevent deformation of the rotor coil 5 due to centrifugal force or heat due to the rotation of the rotor, a plurality of rotor coils may be provided between the rotor coils 5 outside the rotor core end in the longitudinal direction as shown in FIG. The interval blocks 13 are inserted at appropriate intervals in the axial longitudinal direction and the radial direction. These spacing blocks are made of an insulating material such as an epoxy resin-impregnated glass cloth laminated plate, and are composed of one piece or a plurality of pieces. Further, two adjacent spacing blocks 13 are connected by a connecting plate 14. The spacing block 13 and the connecting plate 14 are fixed by an adhesive and a pin 15. In addition, in FIG.
12 is a retaining ring, and 16 is an insulating cylinder.

The rotor constructed as described above is loosened between the spacing block 13 and the rotor coil 5 when the size of the gap between the rotor coils changes due to the deformation of the rotor coil 5 due to the centrifugal force due to the rotation and the heat. And a bulging phenomenon occurs. Therefore, when the components that make up these components are assembled, after the assembly of the entire rotor is completed, adjustment is made so that the vibration value is minimized by high-speed balance.Even if this adjustment is performed, rotation due to centrifugal force and heat will occur. The deformation of the child coil 5 may change the size of the gap between the coil windings, which may cause loosening or tension between the spacing block and the rotor coil, resulting in increased vibration of the rotor. In particular, when the position of the spacing block is changed or dropped, vibration of the rotor rapidly increases due to weight imbalance. Further, when a large tension force is applied between the rotor coil and the spacing block, the fitted state of the retaining ring may be changed, and the vibration may increase.

As described above, in order to prevent the loosening and the tension phenomenon between the spacing block and the rotor coil from occurring due to the deformation of the rotor coil due to the centrifugal force and the heat, the dimension of the gap between the components is set. It is necessary to keep it constant and the pressing force constant. However, since the conventional spacing block is composed of one or a plurality of solid structure insulators, it is not possible to follow the change in the gap size between the rotor coils.

Next, the prior art relating to the fourth aspect of the present invention will be described.

In a cylindrical rotary electric machine such as a turbine generator, in order to connect the N pole winding and the S pole winding of the rotor,
A structure as shown in FIG. 13 is often used. Note that the relationship between the N-pole winding and the S-pole winding may be opposite to that in FIG. 13, but the description will be given here with reference to FIG.

The S pole winding 17 is composed of an S pole winding end turn portion 18 obtained by processing a rectangular coil conductor and an S pole winding straight portion 19, and has a structure in which these are wound in a plurality of layers. As shown in FIG. 14, the layers are insulated by sandwiching the end portion turn insulation 20 and the straight portion turn insulation 21. On the other hand, the N-pole winding 22 is also similarly configured by the N-pole winding end turn portion 23 and the N-pole winding linear portion 24. In an actual turbine generator, multiple layer winding coils are used for each of the S pole and N pole.
There are about 8 to 8 sets each, and they are arranged in a nested manner in the axial direction and the circumferential direction about the pole. However, in FIG. Only the part is drawn.

Of the S-pole winding end-turn parts 18, which are the constituent elements of the S-pole winding 17, the lowest layer is the N-pole winding 22.
Of the N-pole winding straight line portion 24 and is connected to the lowermost layer. Here, the S pole winding end turn section 1
Of the lowermost layer of No. 8, the portion extending to the lowermost layer of the N-pole winding 22 is referred to as the inter-pole transition section 25. Reference numeral 26 denotes an adhesive tape that connects the end turn insulation 20 and the straight turn insulation 21. As shown in FIG. 15, the rotor winding end portion is held against centrifugal force by the retaining ring 12 via the insulating cylinder 16. Retaining ring 1
2 is fixed to the rotor shaft 1s by shrink fitting in this example.

By the way, when the rotor rotates at a rated speed of 3,000 to 3,600 revolutions per minute, the retaining ring 12 expands in the radial direction by the centrifugal force applied to the rotor winding end and itself. Elastically deforms. Along with this deformation, a phenomenon occurs in which the position of the inter-electrode crossover portion 25 is displaced as shown in FIG. Note that, in FIG. 16, for simplification, the relative position is shown with reference to the N-pole winding end-turn portion 23, but in reality, as the retaining ring 12 swells, the S-pole winding end-turn portion 18 is formed. Since the N-pole winding end-turn portion 23 also moves radially outward, as a result, the space between the S-pole winding end-turn portion 18 and the N-pole winding end-turn portion 23 is opened. Each time the generator is repeatedly started and stopped, such deformation is repeated and hits the "A" and "B" portions of the end turn insulation 20 that is less than 0.5 mm in thickness, that is, the corners of the coil conductor. The part is damaged, the end part turn insulation 20 and the straight part turn insulation 21 are displaced, and slacks and creases are generated. Due to these phenomena, the end part turn insulation 20 and the straight part turn insulation 21 are cut off. The end turn insulation 20 and the straight turn insulation 21 may come out between the coil conductors, causing a defect such as an interlayer short circuit. In conventional size generators, the above problems due to insulation damage did not pose a problem, but as a result of examination and verification aimed at further increasing the capacity of the generator, the above insulation damage was found. It became clear that there was a need for measures.

[0021]

As described above, the rotor of the conventional rotary electric machine has a drawback that the armor is easily deformed or damaged, and the rotor having a long core has a radial flow type ventilation. When using the cooling method,
It is impossible to select a large field current value, and the improvement of the sub-slot as the improvement measure is not effective. Further, in the rotor of the conventional rotating electric machine, in order to prevent the loosening and the tension phenomenon from occurring between the spacing block and the rotor coil, the gap dimension between the components is always constant and the pressing force is also constant. However, since the conventional spacing block is composed of one or a plurality of solid structure insulators, it is impossible to follow the change in the gap size between the rotor coils. Furthermore, especially in large-capacity generators, the corners of the coil conductor of the end turn insulation may be damaged, or the end turn insulation and the straight part turn insulation may be misaligned, causing slack or creases, or breaking. There is a possibility that a problem such as an interlayer short circuit may occur due to the looseness, or the end part turn insulation and the straight part turn insulation coming out from between the coil conductors.

It is an object of the present invention to provide a rotor of a rotary electric machine which has improved reliability by solving these problems.

[0023]

The first invention of the present invention is as follows:
Between the armor on the bottom of the coil slot and the coil conductor at the bottom, a flat underlay plate is arranged,
A second aspect of the invention is characterized in that an axial path is formed in the coil slot in the end area of the rotor, and cooling gas flowing in the axial path and the sub-slot is divided into a radial path. The third invention is
A spacing block inserted between rotor coils axially outward of the rotor core end, and a pair of block pieces, and a spring piece inserted between them and capable of following a dimensional change in the thickness direction of the spacing block. It is characterized by being composed of
Of the present invention uses a hard insulating block having a thickness exceeding the interlayer insulation of other adjacent parts as the interlayer insulating material at the corner of the inter-electrode connecting part, and fixing this insulating block to the coil conductor of either the upper layer or the lower layer. However, the other coil conductor has a structure capable of sliding.

[0024]

According to the first aspect of the present invention, the flat underlay plate is arranged between the armor on the bottom of the coil slot of the rotor and the coil conductor at the bottom, so that the rotor can be assembled during assembly. It is possible to prevent damage to the armor during rotation and to facilitate the assembly work. According to the second invention, by increasing the cooling gas flow rate at the rotor core end portion, the cooling state of the core end portion can be improved, the field current maximum allowable value can be increased, and A high-performance and highly reliable rotor of a rotating electric machine that can suppress deterioration at high temperatures can be provided. According to the third aspect of the invention, the dimension of the spacing block inserted between the rotor coils in the thickness direction is the spring piece of the spring piece in response to the elongation or deformation of the rotor coil due to the centrifugal force or the temperature rise caused by the rotation of the rotor. Since it changes due to the action, the dimensional change of the rotor coil is sufficiently followed, and the rotor coil is always in contact with the rotor coil with an appropriate pressing force. Therefore, the factor that increases the vibration of the rotor is eliminated, and the rotor can continue stable operation, so that the reliability of the rotating electric machine can be improved. According to the fourth aspect of the invention, the turn insulation of the inter-electrode crossover can be prevented from being damaged or coming off even when the inter-electrode crossover is displaced due to the start / stop of the generator. Can be improved.

[0025]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows an embodiment of a rotor of a rotary electric machine according to the first invention of the present invention. A rotor core 1 has a large number of coil slots 2 formed along its axial direction.
A coil conductor 3 made of a rectangular copper strip or the like is inserted between these coil slots to electrically insulate it through a turn insulation 4 while being wound in multiple layers to form a rotor coil 5. In this embodiment, the coil conductor 3 is formed by brazing two flat copper strips into one set,
A turn insulation 4 is inserted every two flat copper strips. Further, to insulate the coil conductor 3 from the ground, an insulating armor 6 is inserted between the inner surface of the coil slot 2 and the coil conductor 3 so as to surround the coil conductor 3. The armor 6 is divided at the bottom of the coil slot and is formed as an L shape. An underlay plate 7 made of a strip-shaped insulator is laid between the armor 6 on the bottom surface of the coil slot and the coil conductor 3 at the bottom (innermost layer) to secure an insulation distance. A cripage block 9 for ground insulation is arranged outside the coil conductor 3, and a rotor wedge 8 is fitted on the outside of the cripage block 9 so that the rotor coil 5 is formed.
To prevent it from popping out.

The underlay plate 7 may be made of a hard insulating material, but as shown in FIG. 17, a cushion layer such as Nomex sheet or polyester felt is formed on both upper and lower sides of the hard underlay substrate 7a. It is desirable to use a structure in which 7b is covered or a base plate of the underlay plate 7 itself having a cushion function.

In the rotor of the rotating electric machine of the present invention thus constructed, the underlay plate 7 is provided between the armor 6 on the bottom of the coil slot and the coil conductor 3 at the bottom (innermost layer).
That is, since it is arranged outside the armor 6 on the bottom surface of the coil slot, even if a large force is applied during the assembling and forming work of the coil conductor, the armor is still subjected to the force through the underlay plate 7. Is less likely to be damaged. Further, when the rotating electric machine is rotated, the conventional underlay plate has a centrifugal load against the armor bottom portion, but in the rotor of the present invention, since the underlay plate is arranged outside the armor bottom portion, No centrifugal force is exerted on the bottom of the armor. In particular, when using an underlaying board with a cushioning function, even if there is some local deformation in the coil conductor, this can be absorbed by the cushion or the shock and load can be dispersed. The armor can be prevented from being damaged during rotation or rotation, and the assembly work can be facilitated.

Since damage to the armor that is first used when assembling the rotor requires a lot of labor for disassembly and reassembly regardless of the time when it is discovered, measures to prevent damage to the armor are an extremely important technical issue. However, according to the present invention, it is possible to reduce the damage to the armor, and it is possible to contribute to improving the reliability and extending the life of the rotor of the rotating electric machine. Next, an embodiment of the second invention of the present invention will be described.

According to the present invention, as shown in FIG. 18, a large number of coil slots 2 and sub-slots are formed in a rotor core 1, and a coil conductor made of a rectangular copper strip or the like is provided in the coil slot 2 for turn insulation. In a radial flow type rotary electric machine in which a rotor coil is formed by interposing and winding it in multiple layers, the amount of ventilation of the radial path in the end range A and the end range C of the rotor is larger than that in the central range B. The shape is such that there are many.

FIG. 19 shows the radial path 11a and the axial path 11b in the end areas A and C. In this example, as the coil conductor 3, two wide rectangular copper strips 3a and a smaller rectangular copper strip 3b are laminated,
The braided one is used as a set, and the wide rectangular copper strips 3a are provided with notches 3s on both sides at appropriate intervals in the longitudinal direction of the coil slot 2 to provide radial paths 11a.
The space between both sides of the narrow rectangular copper strip 3b and the armor 6 forms an axial path 11b. Therefore, the cooling gas introduced from the end for each layer of the rotor coil flows through the axial path 11b in the end ranges A and C, and is branched into the radial path 11a.

FIG. 20 shows the radial path 11 in the central range B.
a and an axial path 11b are shown. Within this range, as the coil conductor 3, two wide rectangular copper strips 3a, 3a are provided.
The b is laminated and brazed into one set, and through holes 3h are provided at appropriate intervals in the longitudinal direction to form a radial path 11a. In this case, through-holes are also provided in the base plate 7, the bottom of the armor 6, the turn insulation 4, the cripage block 9 and the rotor wedge 8 so as to be located on the same line as the through-holes 3h of the coil conductor 3. Then, the radial path 11a is formed. The axial path 11b is formed only in the sub-slot 10, and the cooling gas flowing in the sub-slot 10 is shunted to the radial path 11a in the central range B.

FIG. 21 shows another embodiment of the second invention of the present invention. The radial paths 11a and the axial paths 11b in the end regions A and C are composed of two flat copper plates forming the coil conductor 3. The axial path 11a in the central range B is formed by a combination of notches provided on both sides of the strips 3c and 3d, and the coil copper strip 3, the underlay plate 7, the bottom of the armor 6, the turn, as in the case of FIG. It is formed by a through hole 3h provided in the insulation 4, the cripage block 9 and the rotor wedge 8.

In the axial paths 11b in the end regions A and C, the cooling gas flowing in the sub-slot 10 and the cooling gas taken in from each end of each layer of the rotor coil flow and split into the radial path 11a. However, the axial path 11b in the central range B is
The cooling gas is formed only in 0, and the cooling gas flowing in the sub-slot 10 is shunted to the radial path 11a in the central range B.

As described above, in the present invention, the ventilation passage inlet is provided at each end of the iron core of the rotor coil 5 for each layer of the coil conductor 3 and the axial path 11b is formed, whereby the end regions A and B are formed. The flow path area in
The flow rate of cooling gas is increased. That is, axial pass 11
When b is only in the sub-slot 10, as described with reference to FIG. 6, the ventilation amount in the end regions A and C is reduced in accordance with the flow velocity and flow distribution in the axial direction of the radial path. As a result of increasing the flow rate of the cooling gas in the end region, the temperature rise value of the rotor coil 5 can be reduced as shown by the curve T2 in FIGS. 7 and 22. Therefore, the maximum temperature and the average temperature of the rotor coil 5 are reduced.

As described above, according to the second aspect of the present invention, by increasing the flow rate of the cooling gas at the end of the rotor core, the cooling state of the end of the core can be improved and the rotor can be improved. It is possible to make the temperature distribution of the coil uniform and suppress the maximum and average temperatures of the rotor coil. Therefore, it is possible to increase the maximum allowable value of the field current, suppress the high temperature deterioration of the insulator, and provide the rotor of the rotating electric machine with high performance and high reliability.

Next, a third embodiment of the present invention will be described. 23 to 25 show examples of the spacing block 13 inserted between the rotor coils axially outward from the rotor core end in the rotor of the rotating electric machine of the present invention. The example also includes block pieces 27 and 28 formed by molding a metal material or an insulating material, and spring pieces 29 to 31 interposed therebetween. In the example of FIG. 23, a thin plate corrugated insulator is used as the spring piece 29. This spring piece is housed in the housing groove 27a formed in the inner surface of the block piece 27 (the surface facing the block piece 28) so as to partially project, and the block pieces 27, 28
When they are combined and inserted between the rotor coils, a spring action is exerted between them. In the example of FIG. 24, the spring piece 30
For this, an arc-shaped insulator is used. This spring piece also fits in the storage groove 27a formed on the inner surface of the block piece 27,
It is stored so that a part of it protrudes, and the block piece 27,
When 28 is combined and inserted between the rotor coils, it exerts a spring action between them. In the example of FIG. 25, a plurality of spiral coils are used as the spring pieces 31.
As each of the spiral coils, a coil having a coating layer formed of an insulating paint on the surface of a metal coil is used.
These spring pieces are also housed so as to partially project into the housing groove 27b formed on the inner surface of the block piece 27, and when the block pieces 27 and 28 are combined and inserted between the rotor coils, Exerts a spring action between.

In any of the above embodiments, when the block pieces 27 and 28 are made of an insulating material, the spring piece 2 is used.
A conductive material such as metal may be used as 9, 30, 31. Further, when the spacing blocks 13 of the present invention are inserted and fixed between the rotor coils, as in the case of FIG. 12, two adjacent spacing blocks 13 are coupled by the coupling plate 14, and the epoxy resin adhesive is used. It is fixed by the agent and the pin 15.

As described above, according to the third aspect of the present invention, the spacing inserted between the rotor coils against the expansion and deformation of the rotor coils due to the centrifugal force due to the rotation of the rotor and the temperature rise. Since the dimension of the block in the thickness direction changes due to the spring action of the spring piece, it sufficiently follows the dimensional change of the rotor coil and always contacts the rotor coil with an appropriate pressing force. Therefore, there is no change in the positions of the braces or the spacing blocks, or the spacer blocks fall out, and the force to bend the retaining ring is not generated. In addition, there is no change in weight due to a change in the position of the interval block or a drop in the interval block. As described above, the factor that increases the vibration of the rotor is eliminated and the rotor can continue stable operation, so that the reliability of the rotating electric machine can be improved.

Next, a fourth embodiment of the present invention will be described.

In the embodiment shown in FIG. 26, the insulating block 32 is used for interlayer insulation of the corner portion of the inter-electrode transition portion 25. As shown in FIG. 27, this insulating block has protrusions 32 in the thickness direction on both sides of one side of its peripheral portion.
a and 32b are provided, and these protrusions are engaged with the step portion 22a formed in the vicinity of the corner portion of the N-pole winding 22 to be attached to the N-pole winding 22 (assembly procedure 1). On the other hand, the inter-pole crossover portion 25 on the S pole winding side has a part of the end turn insulation 20 and the straight line turn insulation 21 removed, and when the N pole winding 22 is assembled by the assembly procedure 2, The block 32 slidably contacts the inter-pole crossover portion 25 in the lowest layer on the S pole winding side. Insulation block 3
2 has a step 32c formed by cutting off a part of the surface on the opposite side of the protrusions 32a and 32b. This is because the insulating block 32 slides on the inter-pole crossover section 25 on the S pole winding side. It is provided to prevent damage due to contact with the straight portion turn insulation 21 on the side of the S pole winding.

The insulating block 32 is suitable to have a thickness of about 2 to 5 mm except for the protrusions 32a and 32b which are fixing means, and the material thereof has a low friction resistance with the winding conductor and a high strength. For example, a hard polyethylene or glass polyester laminate is desirable. As an example, among the hard polyethylene materials, HiZex (trade name) is a desirable material because it has a friction coefficient of 0.08 to 0.1 and is slippery and can withstand a surface pressure of 1.2 kg / mm ² or more. Is one.

In the embodiment of FIG. 28, the insulating block 3
3 is a protrusion 33 in the thickness direction on both sides of one side of the peripheral portion.
a and 33b are partially provided, and these protrusions are
The pole winding 22 is attached to the N pole winding 22 by being engaged with the vicinity of the corner portion of the pole winding 22. Insulation block 33
A taper surface 33c is formed on the back surface of the. The thickness of the tip of this tapered surface is equal to the straight-line turn insulation 21.
The thickness is almost equal to. Insulation block 3
In the vicinity of the outer end surface on the back side of 3, the corner portion 25
The notch 33d is formed so as not to hit a.

In the embodiment of FIG. 29, the insulating block 34 is
An example in which it is attached to the S pole winding side on the inter-pole transition portion 25 side is shown. In this case, a step 25b is provided in the inter-electrode transition portion 25 so as to be thinner than the surroundings, and a stop hole 25c is provided. The insulating block 34 has a substantially flat plate shape, and a step 34a is formed near one end thereof so as not to damage the straight-line turn insulation 21 on the S pole winding side. The insulating block 34 is arranged so as to be aligned with the step 25b of the inter-pole transition portion 25, and is attached by fitting a stop pin 35 between the stop holes 25c and 34b (assembly procedure 1). Are assembled (assembly procedure 2).

The embodiment of FIG. 30 shows an example in which a tapered insulating block 36 is used and is attached to the S pole winding side on the side of the inter-pole transition section 25. In this case, no step is provided on the inter-pole transition portion 25 side or the insulating block 36, and the insulating block 36 is attached by the stop pin 35 fitted between the stop holes 25c and 36b.

The embodiment of FIG. 31 shows an example in which a substantially flat plate-shaped insulating block 37 is attached to a corner portion on the N-pole winding side. In this case, a step 22a is provided at the corner of the N-pole winding 22 side so as to be thinner than the surroundings, and a stop hole 22b is provided. The insulating block 37 has a substantially flat plate shape, and a step 37a is formed near one end thereof so as not to damage the straight-line turn insulation 21 on the S pole winding side. The insulating block 37 is arranged so as to match the step 22a at the corner portion on the N-pole winding 22 side, and is provided with the stop holes 22b, 3
It is attached by fitting a stop pin 35 between 7b. In this embodiment, the corner portion 25 of the inter-pole transition portion 25 is
The widthwise dimension of the insulating block 37 is made smaller than the widthwise dimension of the corner portion on the N-pole winding 22 side so as not to hit a. Although some embodiments have been described above, selection of a partner to which the insulating block is fixed, a method of assembling the insulating block, a fixing method, and a relief for preventing the corner of the copper band (coil conductor) from hitting the insulating block. It can be implemented by appropriately combining the methods of providing. As a partner for fixing the insulating block, it is better to select a lower layer copper strip (in this example, the S pole winding), but the copper strip in the upper layer is less deformed, From the viewpoint of phenomena / behavior, it is more desirable to fix it to the upper copper strip.

As described above, according to the fourth aspect of the present invention, the turn insulation of the inter-electrode crossover is prevented from being damaged or coming off even when the inter-electrode crossover is displaced due to the start / stop of the generator. Therefore, the reliability of the rotating electric machine can be improved. Therefore, it is possible to realize a large-sized and large-capacity turbine generator as compared with the conventional one, and also for a maximum-capacity class turbine generator unit, a DSS (Daily Start-St) for coping with peak load of the power system
op) Operation can be enabled.

[0047]

According to the present invention, the following effects can be obtained.

1. It is possible to prevent damage to the armor during assembly and rotation of the rotor, and to facilitate assembly work.

2. It is possible to improve the cooling state of the end portion of the iron core, make the temperature distribution of the rotor coil uniform, and suppress the maximum temperature and average temperature of the rotor coil.

3. The factors that increase the vibration of the rotor are eliminated, and the rotor can continue stable operation.

4. It is possible to prevent damage or drop-out of the turn insulation of the inter-electrode transition part even if the inter-electrode transition part is displaced due to the start / stop of the generator.

As a result, the reliability of the rotary electric machine can be improved.

[Brief description of drawings]

FIG. 1 is a transverse cross-sectional view of a rotor according to an embodiment of the first invention in the vicinity of a slot.

FIG. 2 is a transverse cross-sectional view of a rotor and its vicinity for explaining a conventional example according to the first invention.

FIG. 3 is a perspective view of the vicinity of a rotor coil for explaining a conventional example according to the first invention.

FIG. 4 is a longitudinal sectional view of a rotor for explaining a conventional example according to the second invention.

5 is a cross-sectional view taken along the line VV of FIG.

FIG. 6 is an explanatory diagram of a flow velocity and the like in the sub-slot and the radial path in the rotor of FIG.

7 is an explanatory diagram of a temperature rise of a rotor coil in FIG.

FIG. 8 is an explanatory view showing another example of the conventional example according to the second invention.

FIG. 9 is an explanatory view showing still another example of the conventional example according to the second invention.

10 is a vertical sectional view taken along line XX of FIG.

11 is a cross-sectional view taken along the line XI-XI of FIG.

FIG. 12 is a perspective view near a coil end portion of a rotor for explaining a conventional example according to the third invention.

FIG. 13 is an explanatory diagram of a pole-to-pole transition portion of a rotor coil for explaining a conventional example according to the fourth invention.

FIG. 14 is a perspective view of a pole-to-pole transition portion of a rotor coil for explaining a conventional example according to the fourth invention.

FIG. 15 is a vertical cross-sectional view of a rotor coil end support structure for explaining a conventional example according to a fourth invention.

16 is an explanatory diagram showing relative displacement of the inter-pole transition portion of the rotor coil of FIG.

FIG. 17 is a vertical sectional view showing an embodiment of the underlay plate used in the first invention.

FIG. 18 is an explanatory diagram of a rotor of a rotary electric machine to which the second invention is applied.

FIG. 19 is a rotor end portion range A, C in the second invention.
Cross-sectional view of the vicinity of the slot.

FIG. 20 is a cross-sectional view of the rotor according to the second aspect of the present invention in the vicinity of the slots in the central range B of the rotor.

FIG. 21 is a perspective view showing another embodiment of the rotor coil according to the second invention.

FIG. 22 is an explanatory diagram of a temperature rise of a rotor coil in the second invention.

FIG. 23 is a perspective view showing an embodiment of an insulating block according to the third invention.

FIG. 24 is a perspective view showing another embodiment of the insulating block in the third invention.

FIG. 25 is a perspective view showing still another embodiment of the insulating block according to the third invention.

FIG. 26 is an explanatory diagram of a pole-to-pole crossing portion of a rotor coil according to a fourth invention.

FIG. 27 is an exploded perspective view of an embodiment of the inter-pole transition portion of the rotor coil in the fourth invention.

FIG. 28 is an exploded perspective view of another embodiment of the inter-pole transition portion of the rotor coil in the fourth invention.

FIG. 29 is an exploded perspective view of still another embodiment of the inter-pole transition portion of the rotor coil in the fourth invention.

FIG. 30 is an exploded perspective view of yet another embodiment of the inter-pole transition portion of the rotor coil in the fourth invention.

FIG. 31 is an exploded perspective view of still another embodiment of the inter-pole transition portion of the rotor coil in the fourth invention.

[Explanation of symbols]

 1 ... Rotor iron core 1s Rotor shaft 2 ... Coil slot 3 ... Coil conductor 3s ... Notch 3h ... Through hole 4 ... Turn insulation 5 ... Rotor coil 6 ... …… Armor 7 ………… Underlay board 7a …… Underlay board 7b …… Cushion layer 8 ………… Rotor wedge 9 ………… Kripage block 10 ………… Sub-slot 11, 11a… Radial path 11b …… Axial path 12 ………… Retaining ring 13 ………… Spacing block 14 ………… Connecting plate 15 ………… Pin 16 ………… Insulation cylinder 17 ………… S pole winding 18 ………… S pole winding end turn section 19 ………… S pole winding straight section 20 …… End section turn insulation 21 ……… Straight section turn insulation 22 ……… N pole winding 22b, 25c, 34b, 36b, 37b… Stop hole 23 ………… N Pole winding end turn part 24 ... ... N-pole winding straight part 25 ... ... inter-pole transition part 26 ... ... adhesive tape 27, 28 ... block pieces 27a, 27b ... storage groove 29 to 31 ... spring pieces 32-34, 36, 37 ... insulating block 32a , 32b, 33a, 33b ... Projection portion 33c ... Tapered surface 35 ...

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Ryotori 2-4, Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Toshiba Keihin Office (72) Inventor Isao Koyahata 4-2, Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Stock Company Toshiba Keihin Office

Claims (14)

[Claims] 1. A plurality of coil slots are formed along an axial direction of a rotor core, and these coil slots are provided with:
In a rotor in which coil conductors are wound in multiple layers via an insulating armor to form a rotor coil, a flat underlay plate is placed between the armor on the bottom of the coil slot and the coil conductor at the bottom. A rotor of a rotating electric machine characterized by the above. 2. The rotor of a rotary electric machine according to claim 1, wherein the underlay plate has a cushion function. 3. The rotor of a rotating electric machine according to claim 2, wherein the underlay plate comprises a hard underlay substrate and cushion layers covering both upper and lower surfaces thereof. 4. A radial flow type rotary electric machine in which a rotor core has a large number of coil slots and sub-slots, and a coil conductor is wound in the coil slots to form a rotor coil. In the rotor of the rotating electric machine, an axial path is formed in the coil slot, and the cooling gas flowing in the axial path and the sub-slot is divided into a radial path. 5. The axial path in the coil slot is
The rotor of a rotary electric machine according to claim 4, wherein the rotor is formed by notches formed on both sides of the coil conductor. 6. A plurality of coil slots are formed along the axial direction of the rotor core, and these coil slots are provided with:
A rotor of a rotating electric machine, wherein a rotor coil is formed by winding coil conductors in multiple layers through an insulating armor, and a spacing block is inserted between rotor coils axially outward from a rotor core end. A rotor of a rotary electric machine, characterized in that the spacing block is composed of a pair of block pieces and a spring piece interposed between the block pieces and capable of following a dimensional change in the thickness direction of the spacing block. 7. The rotor of a rotating electric machine according to claim 6, wherein the block piece is made of a metal material, and at least the surface of the spring piece is made of an insulating material. 8. The rotor of a rotary electric machine according to claim 7, wherein the spring piece is formed by coating the surface of the spiral coil made of metal with an insulating paint. 9. In interlayer insulation of a pole-to-pole connecting portion of a rotor having a rotor coil in a groove formed in an axial direction of the rotor, as an interlayer insulating material at a corner portion of the pole-to-pole connecting portion, an interlayer of another portion adjacent A hard insulating block having a thickness exceeding the insulation is used, and this insulating block is fixed to either one of the upper or lower coil conductors, and can be slid with the other coil conductor. Rotor of rotating electric machine. 10. The rotor of a rotary electric machine according to claim 9, wherein the insulating block is made of a material having low frictional resistance with the coil conductor and high strength. 11. A step, which is thinner than other portions, is provided in the vicinity of a corner portion of a coil conductor on either the upper layer or the lower layer of the insulating block, and the insulating block is fixed to this step. The rotor of the rotary electric machine according to claim 9. 12. The rotor of a rotary electric machine according to claim 9, wherein a taper surface is provided on one surface of the insulating block. 13. The insulating block is provided with projections in the thickness direction on both sides of one surface of its peripheral portion, and these projections are attached to the winding conductor by engaging in the vicinity of the corners of the coil conductor. The rotor for a rotating electric machine according to claim 9, wherein the rotor is a rotor. 14. The rotor of a rotating electric machine according to claim 9, wherein the insulating block is attached to the coil conductor of the upper layer or the lower layer via a stop pin.