JPS588656B2 - Rotating electrical machine conductor connection wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in conductor connection wires for rotating electric machines, and particularly relates to connection wires for connecting conductors of field windings of rotating electric machines, and in which a plurality of thin cross-section pieces are laminated. However, the connection line is curved.

In general, for example, in electrical wiring in factories, power generation substations, etc.
In order to absorb the deformation of the conductor due to thermal expansion or vibration, and to alleviate the internal stress of the conductor, multiple thin pieces are laminated to connect the conductors, and then they are bent to make them flexible. Electrical connections are made using this connecting wire.

However, for example, connecting wires for conductors attached to a rotating body, such as in a rotating electrical machine, continue to be subjected to centrifugal force during operation, and in this state, they are exposed to heat expansion of the conductor and intense vibration of the rotating body, making the condition even worse. be.

FIG. 3 is a cross-sectional perspective view showing a main part of a conventional connection line for the conductor of a rotating electric machine of this type.

As shown in this figure, a first conductor 1 and a second conductor 2 mounted on a rotating body are connected by a connecting wire 3.

The conductor and the connecting wire are connected by soldering or bolts.

The connecting wire 3 is made by laminating a plurality of thin pieces in cross section and bending them.

On the outer diameter side of the connecting wire, there is a trunk insulation 5 for the purpose of ground insulation.
A retaining ring 6 for retaining the centrifugal force of the connecting wire and the conductor is arranged thereon.

When the connecting wire attached to the rotating body is stationary, the curved portion maintains a predetermined curved shape as shown in Figure 3, but when the rotating body enters the operating state, As the speed increases, the centrifugal force continues to increase, the retaining ring 6 expands in the outer radial direction, and the conductors 1 and 2 also expand in the outer radial direction together with the retaining ring.

The connecting gland connected to the conductor 1.2 is therefore subjected to a stretching force, also due to its flexibility.

At constant speed, the above-mentioned acting force stops.

On the other hand, as the rotating body is decelerated, the centrifugal force becomes smaller, and the retaining ring contracts in the inner radial direction, thereby exerting a force so that the connection line contracts.

At the same time, the connecting wire is subjected to deformation due to heat expansion of the conductor and intense vibration of the rotating body.

In other words, this type of connecting wire is constantly undergoing repeated mechanical and thermal deformations.

Therefore, the connecting wire continues to be subjected to repeated fatigue, eventually cracking and eventually breaking.

This type of connection wire attached to the rotating body is required to have extremely high reliability, and must be designed and manufactured with great care.

Furthermore, as a result of this detailed experiment conducted to improve reliability, the following was discovered.

In other words, when the rotating body is accelerated, the connecting line is stretched,
When the speed is reduced, the connecting line contracts.

In this case, the amount of deformation between the first conductor side and the second conductor side is determined by the variation in the coefficient of friction at the contact surface between the trunk insulation and the connecting wire/conductor, and the M shape of the first conductor and the second conductor. They are not the same due to the imbalance, etc.

Therefore, since the amount of deformation on the left and right sides of the connecting line shown in Figure 3 is uneven, the curved part of the connecting line collapses into an acute angle due to the addition of centrifugal force, and is further subjected to repeated tension and compression, resulting in a sawtooth shape. This results in a severe shape, and during intense electrical operation, localized cracks occur and breakage occurs.

There is a method of inserting an elastic body into the curved part to improve the collapse of the curved part of the connecting line, but as mentioned above, it is normal that the curved part of the connecting line does not always deform in the same way on the left and right sides.
If the elastic body is simply fixed to the connecting wire, one side of the curved portion is likely to be greatly deformed, and the amount of deformation on the left and right sides of the connecting wire will be uneven, resulting in cracking and rupture.

The present invention has been developed in view of this, and its purpose is therefore to provide reliable flexibility without cracking, even in the event of asymmetrical deformations of the connecting wire, without the use of complex equipment. To provide this kind of connection line with.

In other words, the present invention achieves the initial objective by providing a connecting wire in which a plurality of thin-walled pieces are laminated and provided with a curved portion, and a pin with a round cross section is rotatably provided in the curved portion. It was designed to do so.

The present invention will be explained in detail based on the embodiments illustrated below.

FIG. 1 shows a state in which a round pin is provided at the curved portion of the connecting wire.

In this figure, a trunk insulation 5 for the purpose of ground insulation is placed on the outer diameter side of the connecting wire, and a retaining ring 6 is placed thereon to retain the centrifugal force of the connecting wire and the conductor.

The first conductor 1 and the second conductor 2 are connected by soldering or bolting through a connecting wire 3.

This connection line is formed by laminating a plurality of thin-walled pieces in cross section, and further has a curved portion.

A pin 4 having a round cross section and having a size that matches a predetermined curve is rotatably arranged in the curved portion.

Now, when the connection wire configured in this way is in an operating state, if the amount of deformation on the left and right sides of the connection wire is uneven, that is, the amount of deformation of the first conductor 1 is larger than that of the second conductor 2, the connection wire 3 A force acts in the direction of arrow a.

Then, this pin 4 facing the body insulation under the centrifugal force contacts the body insulation at only one point on the circumference of the pin, so it is rotated in the direction of arrow b.

The rotation of this pin settles down at a certain position corresponding to the amount of deformation.

In actual rotating electric machines, this amount of deformation is small;
Therefore, the rotation of this pin is also slight.

In this case, the height between the inner surface of the trunk insulation 5 and the curved portion of the connecting wire 3 is always kept constant regardless of the positional movement caused by the rotation of the pin 4.

In other words, since the curved portion of the connecting wire 3 is always maintained in a predetermined curved shape, the curved portion becomes an acute angle due to repeated tensile and compressive forces, causing cracks in the connecting wire and causing breakage. There is no such thing.

Needless to say, sufficient flexibility is ensured according to the amount of deformation of the conductor.

In order to obtain such an excellent connection line, it does not require the same complicated work or high-precision machining as compared to conventional ones, and there is no difference in assembly.

In the above description, one example of forming a flexible connection line has been given, but various other configurations may be considered for forming such a connection line.

Another example is shown in FIG.

In this figure, a pin 4 with a round cross section provided at the curved portion of the connection line is tied with a string or tape 7 so as to be rotatable.

As a result, the pin is rotatably fixed to the curved portion of the connection line, and the same effect as described above is obtained.

As explained above, the present invention consists of laminating a plurality of pieces with thin cross sections between both conductors to be connected, providing a curved part to have flexibility, and making the curved part have a round cross section. The round pin is arranged so that it can rotate, so even if the connection line is deformed unevenly on the left and right sides during operation, that is, one side of the curved part of the connection line is greatly deformed, the round pin will not rotate. Since the connection line is located at the center of the curved part (a position that is symmetrical to the left and right), the curved part of the connection line maintains its curved shape without being significantly deformed. This type of connection wire is easy to work with and has high reliability, which does not cause the curved portion to collapse, cause cracks in the connection wire, or lead to breakage.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional perspective view showing a connecting line and peripheral parts of the present invention, Fig. 2 is a cross-sectional front view of a connecting line showing another embodiment, and Fig. 3 is a cross-sectional perspective view showing a conventional connecting line and peripheral parts. It is a diagram. 1, 2...Conductor, 3...Connection wire, 4.
·····pin.

Claims (1)

[Claims] 1. A connecting wire interposed between both conductors to be connected, which is made by laminating a plurality of thin pieces and bending them to maintain flexibility. A conductor connection line for a rotating electric machine, characterized in that a pin having a round cross section is rotatably installed in a curved part of the connection line. 2. A conductor connection line for a rotating electric machine according to claim 1, wherein the pin is rotatably fixed to a curved portion of the connection line with a string or tape.