JP2010136539A - Rotor of rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backup ring which can be transported in consideration of a tunnel to a hydraulic power plant and a road condition through the diameter of the backup ring supporting a coil end increases because the diameter of a rotor increases along with an increase in speed and capacity of a generator. <P>SOLUTION: A backup ring 3 for supporting a coil end of a rotor is split in the circumferential direction to form a segmented backup ring 3a. A bind wire 2c of high-strength and high-polymer fibrillary property is wound around its outer periphery to augment a strength. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a water turbine generator installed in a hydroelectric power plant, and particularly relates to a rotor structure of a large capacity variable speed generator motor.

  As a coil end structure of a rotor of a conventional large-capacity rotating electrical machine, it is fixed by a coil support member from the outer side of the rotor coil end on the outer side in the axial direction of the rotor core, and an insulator is provided on the inner periphery of the coil. In the structure in which a cylindrical backup ring (coil receiver) is provided via a ring, and an annular ring is arranged on the inner periphery of the backup ring and connected to a rotating shaft or a rotor core, the annular ring has a diameter. A technique is shown in which either the inner side or the outer side of the separated ring is divided into segments and the other one is connected to an annular ring (for example, Patent Document 1).

JP-A-63-310342

  With the recent increase in the speed and capacity of the generator motor, the backup ring is also required to have a large diameter. However, since the conventional backup ring has a one-circle structure as described above, when the diameter is increased, it is difficult to transport to a power plant such as a mountainous area due to roads and tunnels. In addition, if the backup ring is divided into segments for transportation, and the joints of each segment are welded and joined on site, the backup ring will be distorted by the heat during welding. If the structure is such that the joints of each segment are connected with bolts, the hoop force acting on the backup ring must be supported only by the bolts. However, the strength of the backup ring is reduced at the portion, and sufficient mechanical properties cannot be obtained.

  The present invention has been made to solve the above problems, and provides a rotor of a rotating electrical machine that does not reduce the strength of the backup ring even when the backup ring has a large diameter and a split structure. For the purpose.

  In the rotor of the rotating electrical machine according to the present invention, the backup ring that supports the end of the rotor coil inserted into the slot of the rotor core from the inner diameter side is divided in the circumferential direction, and the outer periphery has high strength. A polymer fiber binding wire is wound around.

  Since the present invention has the above-described configuration, there is an effect that the backup ring can have sufficient strength even if the large-diameter backup ring has a split structure because of restrictions on transportation to the site.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings for a rotor 100 of a generator motor of a hydroelectric power station which is a rotating electric machine. Fig.1 (a) is a side view, FIG.1 (b) is A arrow directional view of Fig.1 (a). A rotor core 8 having a plurality of slots 7 formed on the outer peripheral portion is fixed to the rotating shaft 6. A rotor coil 9 is inserted into the slot 7 of the rotor core 8, and the rotor coil 9 is prevented from being detached from the slot 7 by the centrifugal force of the rotor by the wedge 10 inserted on the outer peripheral side in the slot 7. It is fixed to.
In addition, the coil end of the rotor coil 9 on the outer side in the axial direction of the rotor core 8 is made of an aramid fiber that is a binding wire on the outer periphery of the end 1a of the upper coil 14a that is a rotor coil on the outer peripheral side. A high-strength polymer fiber material 2a is wound a plurality of times, and a high-strength polymer fiber material such as an aramid fiber that is a binding wire is formed on the outer periphery of the end portion 1b of the lower coil 14b that is a rotor coil on the inner periphery side. The material 2b is wound a plurality of times.
On the other hand, an iron core retainer plate 11 fixed to the rotor iron core 8 is provided on the outer side in the axial direction of the rotor iron core 8, and the backup ring 3 is attached to the fan 5 fixed to the iron core retainer plate 11 with bolts or the like. It is fixed with bolts.
As shown in FIG. 1B, the backup ring 3 is divided into four segment-shaped backup rings 3a in the circumferential direction by the dividing portion 4, and the dividing portion 4 is provided with a member for connecting the backup rings 3a to each other. The rigidity of the backup ring 3 is ensured by having a structure having no structure and winding the high-strength polymer fibrous material 2c such as aramid fiber around the outer periphery of the backup ring 3 a plurality of times.
With this configuration, when the rotor 100 rotates, centrifugal force acts on the rotor coil 9, but the axial center portion of the rotor coil 9 in the rotor core 8 is constrained by the wedge 10. The coil end portion on the outer side in the axial direction of the rotor core 8 is supported by a high-strength polymer fibrous material 2a such as an aramid fiber around which the upper coil 1a is wound, and the lower coil 1b is It is supported by a high-strength polymer fibrous material 2b such as an aramid fiber wound around the outer periphery.
Further, the centrifugal force of the backup ring 3 acting on the backup ring 3 by the rotation of the rotor 100 is supported by the high-strength polymer fibrous material 2c such as an aramid fiber.

Therefore, the backup ring 3 that supports the coil end portion when the high-strength polymer fibrous materials 2a and 2b such as aramid fiber are wound around the coil end portion is provided with the aramid fiber or the like against the centrifugal force acting during the rotation of the rotor 100. Therefore, even if the backup ring 3 is divided into four parts, the strength is supplemented, and the backup ring 3 can withstand its centrifugal force during rotation. Here, the backup ring 3 is divided into four parts, but the number of parts may be adapted to the transportation situation.
The assembly of the members constituting the rotor 100 is normally performed at a power plant due to transportation restrictions, but the high-strength polymer fibrous material 2c applied to the outer peripheral side of the backup ring 3 is used. When the same material as the high-strength polymer fibrous material 2a, 2b applied to the coil end is used, the tool used in the high-strength polymer fibrous material 2a, 2b for the construction of the high-strength polymer fibrous material 2c is used. Can be used.
Moreover, although the case where the rotor coil end portion was supported by a high-strength material of polymer fiber such as aramid fiber was described as an example, a non-magnetic steel wire may be used, and the rotor coil end The present invention can also be applied to the case where the portion is supported by a U-bolt or the like.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 2B is an A view of FIG. 2A, and FIG. 2C is an enlarged view showing a coupling portion of the backup ring 3a of FIG. Each segment of the backup ring 3a is coupled with a plurality of bolts 12 in FIG. 2, and a high-strength polymer fibrous material 2c such as an aramid fiber is wound around the outer periphery of the backup ring 3 a plurality of times.
With this configuration, the centrifugal force of the backup ring 3 itself acting on the backup ring 3 by the rotation of the rotor 100 can be handled not only by the high-strength polymer fibrous material 2c such as aramid fiber but also by the bolt 12. I can do it. That is, the load acting on the high-strength material 2c such as an aramid fiber wound around the outer periphery of the backup ring 3 is reduced by taking part of the load that the segment-like backup ring 3a tries to jump out to the outer peripheral side with the bolt 12. In addition, since the load that the high-strength polymer fibrous material 2c such as aramid fiber should share can be reduced, the use amount of the high-strength polymer fibrous material 2c such as aramid fiber can be reduced. .

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described based on an enlarged view of the coupling portion shown in FIG. In FIG. 3A, each segment 3a of the divided backup ring 3 is coupled by a bolt 12, and a knock pin 13 is attached to the coupling portion 4 of each segment 3a. The high-strength material 2c is wound a plurality of times.
With this configuration, the positioning of each segment 3a at the time of on-site assembly is facilitated by the knock pin 13. Moreover, the mounting error at the time of field assembly can be reduced, and it can fix enough so that each segment of the backup ring 3 at the time of rotation may not shift | deviate. A plurality of knock pins 13 may be provided between the bolts 12 arranged in the circumferential direction as shown in FIG. 3B so that not only the positioning function but also the centrifugal force can be shared. Furthermore, the structure which provides an uneven | corrugated | grooved part in the segment 3a which the division | segmentation part 4 of the backup ring 3 opposes, and meshes these may be sufficient.

  The present invention can be used for a rotating electric machine such as a high-speed and large-capacity water turbine generator.

It is a figure which shows the structure of the rotor of the generator motor which concerns on Embodiment 1. FIG. It is a figure which shows the structure of the rotor of the generator motor which concerns on Embodiment 2. FIG. FIG. 6 is a diagram illustrating a structure of a rotor of a generator motor according to a third embodiment.

Explanation of symbols

1a, 1b rotor coil end, 2a, 2b, 2c high strength polymer fiber binding wire,
3, 3a Backup ring, 4 Joint part of backup ring,
8 rotor core, 9 rotor coil, 12 bolt, 13 dowel pin,
14a, 14b Rotor coil, 100 rotor.

Claims (4)

In a rotor of a rotating electrical machine provided with a backup ring that supports an end of a rotor coil inserted into a slot of a rotor core from an inner diameter side, the backup ring is divided in the circumferential direction and A rotor of a rotating electrical machine characterized by having a structure in which a high-strength polymer fiber binding wire is wound around a part. The rotor of a rotating electrical machine according to claim 1, wherein the binding wire is a non-magnetic steel wire. 3. The rotor of a rotating electrical machine according to claim 1, wherein the divided portions of the backup ring are coupled by bolts. The rotor of the rotating electrical machine according to claim 3, wherein a knock pin is provided at the division part.

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