JPS6122449B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an electric wire ring, and in particular to a wire ring having a structure in which a cooling pipe for directly cooling the conductor is embedded in the conductor constituting the wire ring. Regarding the production method.

In electric coils with high current density, in order to suppress the rise in temperature of the conductor, a cooling pipe for directly cooling the conductor is embedded or attached to the side of the conductor.

Since wires with this structure require grooves for embedding the cooling pipes and the cooling pipes are embedded, processing distortion is likely to occur, and even if the desired shape of the wire is desired, waving and deformation generally occur. be.

For large wire rings, thick conductors are usually formed and wound one after another, and a so-called layer insulation material is further sandwiched between the conductors. At this time, in order to reduce waving and deformation of the conductor, a dimension-absorbing material is also used to fill the gap, but if the amount of deformation is large, it is difficult to insert this material between the gaps.

It is conceivable to heat the wire ring to expand the space between the conductors and insert a spacer, but since the conductors of the large wire ring are close to each other, the expansion of the gap is relatively small. In other words, even if the coil is heated, it will stretch between the inner conductors wound, so a gap large enough to easily insert a spacer will not be formed.

The present invention has been conceived in view of this, and its object is to provide a method of manufacturing a donut-shaped wire ring that facilitates the insertion of spacers between conductors. In the present invention, when inserting a spacer, heating fluid is caused to flow through the cooling pipe of the conductor on the outer circumferential side of the place where the spacer is to be inserted, and this heating causes a gap between the conductors. Then, a spacer is inserted into this gap to achieve the desired purpose.

Examples of the present invention will be described below.

FIG. 1 shows an example of a donut-shaped coil to which the present invention is applied, and is constructed by winding a plate-shaped conductor 1. FIG. This conductor is laminated and wound in the thickness direction and the outer diameter direction.

This wire ring has a cooling pipe 2 embedded in a conductor 1, as shown in FIG. 2 as a cross section taken along the line AA in FIG. Although not shown in FIGS. 1 and 2, a layer of insulating material is inserted between each conductor. By the way, each conductor 1 is not wound completely parallel,
There are unevenness in various places. FIG. 3 is an enlarged view of the cross section, and shows that the insulating material 3 between the conductors is
Due to the unevenness and sagging of e, the space between the conductors is not completely filled, resulting in a gap 6.

Now, the 1a side is the inner diameter side of the wire ring, for example, the conductor 1c
If you want to fill the gap 6 between 1a and 1d, check the roundness of the wire and the individual conductors 1a to 1d during the conductor winding work.
Measure the sag of 1e and calculate the gap between the conductors 1c and 1d. Cut out an insulating material with an area and thickness that matches this gap.

This insulating material is, for example, as shown in FIG. 4, consisting of a core material 4 such as polyamide paper, glass nonwoven fabric 5 pasted on both sides of the core material 4, and the entire core material 4 dipped in resin. Note that the above-mentioned constituent materials may be made into prepreg in advance.

Next, water is caused to flow from the conductor 1a to the conductor 1c. A heated stream, such as hot water or steam, is passed from the conductor 1d to the outer circumferential side. If you do not want to proceed with the curing of the prepreg insulation that is already between the conductors, a medium that is not too hot, such as hot water, is better.

Even with this, experimental results showed that it was possible to create a gap of approximately 4 mm with a wire ring having a diameter of 4 m.

By cooling 1a to 1c and heating 1d and 1e, the gap between 1c and 1d is increased, and the prepared insulating material can be easily inserted. When the cooling and heating are stopped after inserting the insulating material, the conductor returns to its original state and the gap 6 is completely filled with the inserted insulating material. If necessary, water may be passed through 1d and 1e for cooling.

Conventionally, there was no gap in the narrow gap, making it difficult to insert insulation material, but in this example,
It is possible.

The insulating material inserted into the gap is compressed, and after the insulating material is inserted, the outer periphery is cooled and the gap returns to its original width, making it possible to effectively fill even minute irregularities. Do it like this.

In order to carry out the method of this embodiment, it is desirable to provide an opening for intake and extraction for each turn of the cooling pipe embedded in the conductor, so that the structure is such that the fluid can flow independently. , an inlet and an outlet may be provided every several turns of the cooling pipe.

In other words, the strands can be moved within a few turns, even if not at the boundary between the cooling conductor and the heating conductor.

As explained above, according to the present invention, since the conductor outside the part where the spacer is inserted is heated,
Since the space between the conductors is easily formed, it becomes easy to insert a spacer between the conductors.

[Brief explanation of the drawing]

Figure 1 is a side view of the donut-shaped wire ring, Figure 2 is a sectional view taken along line AA in Figure 1, Figure 3 is an enlarged view of Figure 2,
FIG. 4 is a sectional view showing an example of an insulating material as a spacer. 1... Conductor, 2... Cooling pipe, 3... Insulating material, 4
...Insulating material (core material), 5...Nonwoven fabric insulating material.

Claims (1)

[Claims] 1 Equipped with a cooling pipe inside, compared to the conductor thickness,
In a method of manufacturing a wire ring, in which conductors having a large width are sequentially laminated and wound in the thickness direction and radial direction to form a donut shape, and then a spacer is inserted between these conductors. When inserting the spacers, the spacers are inserted sequentially from the innermost circumferential side to the outer circumferential side of the wire, and the heating fluid is made to flow through the cooling pipe of the conductor on the outer circumferential side of the place where the spacer is desired to be inserted. This method of manufacturing a wire ring is characterized by increasing the gap between the conductors, then inserting a spacer into the increased gap, and sequentially repeating this operation to insert the spacer between the conductors.