JPS6289455A - Rotor coil - Google Patents

Abstract

PURPOSE:To prevent sliding action from being generated between coil copper bands and prevent copper from being generated, by fixing the coil copper band sides in contact with each other, with bonding agent, in case the layers of the coil copper bands are arranged in a slot. CONSTITUTION:The layers of a plurality of coil copper bands 4a, 4b via turn insulators 5a-5f turn by turn are arranged in a slot 2 formed in the longitudinal direction of a cylindrical core 1. Then, contact surfaces between the coil bands 4a, 4b between the respective turns are fixed with bonding agent, and joint sections 10 are formed. By this method, even if layer contact surface pressure between the coil copper bands is reduced, the contact surfaces are fixed with the bonding agent, and so copper powder due to the abrasion of the coil copper bands is not generated, and the reliability of the insulation of the coil can be enhanced.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a rotor coil composed of 46 rows of connected coil copper strips used in large-scale turbine generators, etc., and particularly relates to a rotor coil that is used for large-scale turbine generators, etc. The present invention relates to a rotating f-coil as described above.

[Technical background of the invention and its problems]

This type of rotor coil is inserted into a plurality of axial slots provided along the radial direction of a cylindrical rotor core, and a wedge is provided on the outer periphery of the rotor core. This is to prevent it from popping out due to centrifugal force.

Each magnetic pole coil constituting the rotor coil is composed of a rectangular copper conductor called a coil copper strip, and holes for cooling ventilation are provided in the radial direction of the coil. Additionally, an insulator is inserted between the layers of the coiled copper strips, and the pole coils are connected in series, typically as a single series electrical circuit.

On the other hand, as shown in FIG. 3, some large-scale turbine generators have a configuration in which coil copper strips are connected in parallel to improve the cooling performance of the rotor coil. That is, in FIG. 3, an underlay plate (2) is placed at the bottom of the slot (2) provided in the rotor core (1), and, for example, seven layers of coil copper strips (4a) and (4b) are placed in the slot (2) provided in the rotor core (1). collectively referred to as (4a
□) and C4bx), (4a, ) and (4bz), (
4aa) and (4b3), (4a4) and (4b4), (4
a,) and (4b5), (4aa) and (4bG), (
4a7) and (4b7) are collectively referred to as turn insulators (c) between the layers (between turns) (5a), (5b)
, (5c).

(5d), (5e), and (5f) are arranged respectively, and +ll is connected to the − through the clipage block 0.
! ■ is provided. In FIG. 3, (8) is the thrower 1 to the insulator disposed between the slot 3 and the coil copper JfF.

In such a configuration, since the copper surfaces of the same layer, for example, the coil copper strips (4a7) and (4bI) are in direct contact with each other, as shown in FIG. 4a...
).

(4b?) Minute gap between slot insulator (8) 0
) in slots 1 to (21
The phenomenon of deposition within the interior has been clarified.

The causes of this phenomenon are as follows.

That is, when the turbine generator is stopped, the rotor shaft may be rotated at a low speed, that is, in a turning operation, in order to prevent the rotor shaft from being bent or deformed.

During such low speed operation, the coil copper strip (4a), (4
Since the contact surface pressure between the layers in b) becomes extremely small, relative slippage occurs between the layers and abrasion copper powder is generated.

When the rotation -r- is rotating at high speed, the coil copper band (
A large blood pressure is generated between 4a) and 4b by centrifugal force, and no relative slippage occurs between the layers of the coiled copper bands (4a) and (4b), and no abrasion copper powder is generated.

If a large amount of such copper powder is generated, as shown in FIG. It is possible that a short circuit between the layers of the rotor and the coil copper may occur, inducing large vibrations in the rotor and making it impossible to operate.

Furthermore, one phenomenon of copper powder generation due to l-phase λ/[slip will be explained in detail. It has been revealed that the number of ridges in which copper powder is generated is approximately proportional to the product of the interlayer surface of the coiled copper strip and the surface of the coil when the coil is rotated at low speed. Therefore, it is possible to reduce the generation of copper powder to some extent, but this slip prevention is impossible when assembling the rotor coil. and it cannot be realized. On the other hand, blood pressure is mainly measured by coil copper JiF
(4a), (411) is approximately determined by the total weight of the whole. In this case, the small radial gap σ]) in the slot 1-■ is made small, and the coil copper strip (4a),
(4b) & By inserting the wedge 7 in a tightened state from the outer circumferential side of the o-tor, it is possible to increase the blood pressure between the layers even during low-speed operation and prevent relative sagging.

However, it becomes difficult to assemble each magnetic pole coil and insert the wedge ω, and furthermore, it becomes difficult to assemble each magnetic pole coil and insert the wedge ω.
4a) and (4b) are arranged firmly, there is a risk that the slot insulator (8) may be destroyed.

Therefore, it is desirable to assemble the coiled copper strips (4a) and (4b) so that they can move freely to some extent within the slot (1), and it is necessary to take other measures as a countermeasure against -1- copper powder. The conventional measures will be described below. That is, a structure in which an anti-friction material is inserted between the layers in the same way as the turn insulator (8) is proposed in Japanese Patent Laid-Open No. 57-75543. However, this configuration has several problems in implementation. That is, (1) It is impossible to insert the anti-wear material over the entire length of the coiled copper strip in the axial direction during assembly.

■ By adding the wear part + h material between them, the radial height of the coil copper strip in the slot will increase, so in the case of an existing machine, additional machining will be required to insert the wear prevention material. There is also a problem with the configuration.

■ When attaching the anti-wear material to the surface of the coiled copper strip, drying it, and applying the coil, it is necessary to take precautions to prevent the anti-wear material from breaking or deforming. There is a problem with the above.

[Purpose of the invention]

It is an object of the present invention to have a simple configuration, to facilitate manufacturing, to prevent wear between turn layers of coil copper strips connected in parallel, to prevent generation of copper powder in slots, and to prevent the formation of copper powder in slots. An object of the present invention is to provide a rotor coil that prevents the generation of copper powder within the rotor coil.

[Summary of the invention]

In the present invention, in a rotor coil consisting of a plurality of parallel-connected coil copper strips arranged in layers in a slot formed in the longitudinal direction of one cylindrical core, the parallel-connected coil copper strips are mutually connected to each other. By applying an adhesive to the contacting sides, the contacting surfaces are fixed to each other, preventing sliding and preventing the generation of copper powder.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In addition, in Figures 1 and 2,
Components that are the same as those in FIGS. 3 and 4 are designated by the same reference numerals, and a brief description thereof will be given.

In the slot ■ provided in the radial direction of the rotor core (1),
A bottom plate ■ is installed at the bottom of the 7-layer coiled copper strip (4a
), (4b) are collectively referred to as parallel-connected coil copper strips (4
a1) and (4b,), (4az) and (4b2),...
・The contact surfaces of (4a7) and (4b7) are joined with adhesive to form a joint (10□), collectively referred to as joint (10).
+ (10□), ... (107) are formed, and turn insulators (5a), (5b) ... (5f), collectively referred to as insulator 0, are formed between the layers (between turns), respectively. Deploy. Further, a slot insulator (8) is provided between the coil copper strips (4a), (4b) and the slot (2). As an adhesive, for example, an epoxy resin type adhesive is used at a rate of 0.1 to 0.3
It is best to apply the adhesive to a thickness of about 100 mL, bond by applying pressure and heating, and remove any spilled adhesive before installing it into the slot.

Next, the effect will be explained.

- With the configuration as described in , even if the interlayer contact pressure between the coil copper strips (4a) and (4b) becomes extremely small in the low-speed rotation state during turning operation, the parallel-connected coil copper strips (4f+, ) and (4b1), (4a2) and (4b
7), ... Since the joint (10) has a strength of 1- greater than the shear force between (4a7) and (4bJ), the peeling phenomenon of the joint (10) does not occur, Therefore, minute relative sliding vibrations between the parallel-connected coil copper strips do not occur, making it possible to prevent the generation of abrasion copper powder. Because of this, the adhesion performance is good, and the increase in the height of the coil in the slot is extremely small, so no additional machining is required not only for new machines but also for existing machines.

In addition, in a two-pole turbine generator, the number of copper strips in one turn is usually two, but even in a four-pole machine with a large number of parallel strips, all 16 rows of copper strips are glued together. It is possible to obtain the effects as in the embodiment described below.

〔Effect of the invention〕

As described above, in the present invention, among the coil copper strips connected in parallel, the side that contacts the other side of the coil copper strip 1 constituting one turn is bonded with an adhesive, so that the configuration is f.
tff It can prevent the generation of copper powder within the slots and provide a highly reliable rotor coil.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one slot of an embodiment of the rotor coil of the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a sectional view of one slot of a conventional example. FIG. 4 is an enlarged view of the main part of FIG. 3. 1...Rotating r/iron core, 2...Slot, 3I...
1ζ bottom plate, 4 d+ 4 b... Coil copper band, 5... Turn insulation, 6... Clipage block, 7... Wedge, 8... Slot insulator, 9... Minute gap, 10・Joint part.

Claims (1)

[Claims] In a rotor coil consisting of a plurality of parallel-connected coiled copper strips arranged in layers in slots formed in the longitudinal direction of a cylindrical core, the sides of the parallel-connected coiled copper strips in contact with each other are bonded. A rotor coil characterized in that it is bonded by an agent.