JP2592327Y2 - Coil end fixing device for rotating electric machine coil - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil end fixing device for a rotating electric machine coil, and is particularly useful when applied to a case where the coil end fixing condition is strengthened in a large rotating electric machine such as a water turbine generator.

[0002]

2. Description of the Related Art An electrical insulator generally called a spacer is interposed between adjacent coil ends of a rotating electric machine. This is for the following reason. That is, a short circuit accident or the like occurs in the electric system to which the rotating electric machine is connected,
When an excessive current flows through the rotating electric machine coil, an excessive electromagnetic force is generated between adjacent coils. At this time, a strong bending load is applied to the coil end, and if the load cannot be tolerated, the insulating layer may be broken, which may lead to a dielectric breakdown accident. The spacer is provided in order to restrict the position of the coil end in this portion and increase the mechanical strength by binding the spacer and the coil end with a binding member and integrating the resin with the resin.

[0003] In addition, large rotating electric machines such as water turbine generators are often transported to the site by dividing an iron core portion due to transportation restrictions. Therefore, all or a part of the coil is assembled on site. In this case, there are many restrictions in terms of location and construction method, unlike when assembled at a factory. In the case of spacers, they are often installed on site and must be able to adopt a construction method suitable for on-site work.

FIG. 3 is an explanatory view showing a coil end fixing device for a rotating electric machine coil according to the prior art. As shown in FIG. 1, a conventional coil end fixing device includes a stator coil 2 at a slot exit portion of a stator core 1 of a rotating electric machine.
A binding member comprising a string-shaped binding sleeve or the like formed of a U-shaped spacer 3 made of FRP and a coil end 6 interposed between adjacent coil ends 6 and a polyester called a sleeve. The two are integrated by binding with 4, and then applying, permeating and curing the resin.

[0005]

In the coil end fixing device for the rotating electric machine coil according to the prior art as described above, the minute vibration of the coil 2 generated during the operation of the rotating electric machine, and the cooling / heating cycle of starting and stopping the rotating electric machine. Due to mechanical stress such as expansion and contraction of the coil 2, the binding of the binding member 4 may be loosened and the spacer 3 may slip off from the coil end, and when the spacer 3 slips off, the spacer 3 becomes a coil insulating layer (shown in the figure). ), Which may cause a dielectric breakdown accident.

SUMMARY OF THE INVENTION In view of the above prior art, it is an object of the present invention to provide a more reliable coil end fixing device for a rotating electric machine coil by strengthening the attachment of a spacer to a coil end.

[0007]

In order to achieve the above object, the structure of the present invention is such that a spacer is interposed between adjacent coil ends of a coil fitted into a coil groove of an iron core of a rotating electric machine, and the coil end and the coil end are provided. tight binding the spacer in bondage member, the coil end fixing device then rotating electrical machine coils the coil end and said spacers are integrated with the resin, wherein each spacer has at least the Koiruen
Between the gap end and the coil surface of the coil end
Together comprising a contacting base wall portion, each Koirue
At least on the inner peripheral surface side or outer peripheral surface side in the radial direction of the
The abut the felt across the respective coil end wherein each spacer, along with each of these felts, each
Each of the cores where the spacer and the base wall of each of the spacers abut.
It is characterized by being tied up with Ilend .

[0008]

According to the present invention having the above construction, the contact area between the spacer and the coil end is effectively enlarged through the felt, and the binding force is increased. The spacer is more effectively prevented from deviating from the coil end due to mechanical stress.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an explanatory view showing a coil end fixing device for a rotating electric machine coil according to the present embodiment. As shown in the figure, the coil end fixing device for the rotating electric machine coil has a gap wall 3a between the coil ends 6 of the adjacent stator coils 2 at the slot exit of the stator core 1 of the rotating electric machine.
And the base wall 3b is in contact with the coil surface of the coil end 6.
U-shaped spacer 3 provided in contact with each
At least the inner peripheral surface or the outer peripheral surface in the radial direction of
A polyester felt 5 having a thickness of about 5 mm, which is in contact with each coil end 6 and each spacer 3 on the side thereof, and each spacer 3 and each sleeve together with these felts 5.
Each coil end 6 with which the base wall portion 3b of the pacer 3 abuts is
It has a binding member (sleeve) 4 that binds together as a pair . The sleeve 4, the felt 5, and the coil end 6 are integrated by applying a resin after being tied up, penetrating and curing.

According to the above embodiment, the contact state between the spacer 3 and the coil end 6 is strengthened via the felt 5,
That is, the contact area between the spacer 3 and the coil end 6 is effectively increased, and the binding force is increased as compared with the case where the spacer 3 and the coil end 6 are directly bound by the binding member 4, so that the spacer 3 becomes more compact. Strongly fixed to the coil end 6.

FIG. 2 shows data of a vibration test performed to confirm the increase in the binding force. In this vibration test, each model having the coil end fixing device of the rotating electric machine coil according to the prior art and the coil end fixing device of the rotating electric machine coil shown in the above embodiment (hereinafter, the former is a conventional model, and the latter is an example model) ), A vibration was applied by a vibrator, and the time required for the spacer of the conventional model and the spacer of the embodiment model to fall off from the coil end was measured by the vibration. In FIG. 2, ○ represents measurement data of the example model, X represents measurement data of the conventional model, a represents a straight line obtained by linearly approximating the measurement data of the example model (hereinafter, referred to as an approximate line a), and b represents measurement of the conventional model. This is a straight line obtained by linearly approximating the data (hereinafter, referred to as an approximate straight line b).

From the measurement data shown in FIG. 2, the time required for the spacer to slip off from the coil end is significantly longer in the embodiment model than in the conventional model, the durability against vibration is excellent, and the binding force is increased. Was confirmed.
Looking at the relationship between the measured data and the approximate straight line a and the approximate straight line b, the example model has less measured data distant from the approximate straight line and less variation in characteristics than the conventional model.

Although the above embodiment has been described with respect to the coil end of the stator coil of the rotating electric machine, it is needless to say that the present invention can be applied to the coil end of the rotor coil. Further, in the above embodiment, the U-shaped spacer and the felt made of polyester are shown as an example, but the invention is not limited thereto. The shape of the spacer is not limited to the U-shape, and the shape is not particularly limited as long as it can be bound, such as the shape of a mouth. It is not necessary to limit the material of the felt to polyester, and other materials may be used.

[0015]

According to the present invention, as described above in detail with the embodiment, the present invention has a feature that the felt is interposed between the spacer and the coil end so as to be understood from the vibration test result shown in the above embodiment. The binding force between the spacer and the coil end can be reliably increased as compared with the prior art, which can contribute to the improvement of the operating reliability of the rotating electric machine. In addition, there is no particular increase in the number of steps for mounting the coil end spacer due to the provision of a new felt.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a coil end fixing device of a rotating electric machine coil according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a result of a vibration test of the coil end fixing device according to the related art and the embodiment of the present invention.

FIG. 3 is a diagram showing a coil end fixing device for a rotating electric machine coil according to the related art.

[Explanation of symbols]

 2 Coil 3 Spacer 4 Binding member 5 Felt 6 Coil end

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02K 3/30-3/52

Claims (1)

(57) [Scope of request for utility model registration] 1. A while interposed spacers between adjacent coil ends of the coil which is fitted in the coil groove of the iron core of a rotating electric machine, and the said coil end spacers tightly bound in bondage member, and then the coil end the In a coil end fixing device for a rotating electric machine coil in which a spacer is integrated with a resin, each of the spacers is positioned at least between the coil ends.
Abuts the gap wall portion and the coil surface of the coil end
A base wall portion, and at least an inner peripheral surface side or a radial direction of each coil end.
On the outer peripheral surface side, the abut the felt across the respective coil end wherein each spacer, along with each of these felts, the said respective spacer each
Each coil end with which the base wall of the spacer is in contact
And a coil end fixing device for a rotating electric machine coil, wherein the coil end fixing device is respectively tied.