JPS60190159A - Manufacture of superconductive field coil - Google Patents

Abstract

PURPOSE:To simplify a winding work by winding a plurality of superconductive leads in parallel to wind a coil, then connecting the ends of the leads to form a pole pair of coils, thereby reducing the number of bents or connections. CONSTITUTION:One continuous superconductive lead 3a is wound from the end 3b substantially in the same length on two drums 6, 7, thereby forming a drum pair 8. Then, when the numbers of lateral and superconductive leads are four rows, one respective drums 7 of four drum pairs 8 remain, and four leads 3a are simultaneously wound in parallel toward the inner periphery from the S point of the lowermost and outermost layers of the coil of one pole while leading the leads 3a from the middle pair 9 of the other drums 6. Thus, after the coil for one pole is wound, the coil for one pole is further wound while leading the leads 3a from the remaining 4 drums 7, the coils of two poles are connected to complete a superconductive field coil.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a crown-shaped superconducting field coil used, for example, in a field coil of a superconducting rotating electric machine.

[Technical background of the invention and its problems]

In conventional superconducting rotating electrical machines, a superconducting field coil (hereinafter sometimes simply referred to as a coil) is generally used on the rotor side, so that a strong centrifugal force is applied to the coil in addition to electromagnetic force. Therefore, the problem is how to firmly fix the coil, suppress the occurrence of quenching due to heat generated by the movement of the coil and changes in the magnetic field, and operate the coil stably.

Therefore, the lathe-shaped coil is advantageous in terms of fixation because the coil housed in the slot of the support tube can be fixed with a wedge or fixed on the cylinder with a bind. Figure 1 shows that the wedge (2) is inserted into the slot (1a) of the support tube (1).
It is a perspective view of a superconducting field coil (3) fixed by.

Generally, in superconducting field coils, each superconducting wire has several hundred to
A current of approximately 100 ampere is passed through the superconducting wire, but the cross-sectional area of the superconducting wire is much smaller than that of a normally conducting coil wire, and the number of turns is large. moreover.

In a superconducting field coil, extreme bends in the superconducting wire and connections that generate Joule heat can cause quenching, so it is necessary to reduce their number as much as possible. For this reason, superconducting field coils must be manufactured by winding a long continuous superconducting wire multiple times, and being careful not to leave any bent portions or break the superconducting filaments within the superconducting wire. However, due to its three-dimensional shape, the winding operation of the wedge-shaped coil is much more labor-intensive than that of a flat racetrack coil.

Fig. 2 is a cross-sectional view taken at a part (la) of slot 1 showing one square-shaped coil of the superconducting field coil in Fig. 1. Wound in an array. 3(a) to 3(d) are enlarged views of section A in FIG. 2, each illustrating a different conventional method of winding a superconducting wire.

In Fig. 3(a) to (d), the beginning of winding S of the superconducting wire
is located at the lowest layer and innermost periphery of the coil, and a single superconducting wire is wound from this point, E indicates the end of each winding method, and arrows indicate the winding order. Third
In figure (a), the superconducting wire (3a) is wound from S toward the outer circumference, and after winding in four rows, it is passed to the upper layer and wound from the outer circumference to the inner circumference. The winding work is completed by repeating the process. In this winding method,
The coil can be wound in an orderly manner, but the process involves winding from the outer circumferential side to the inner circumferential side, which is a very time-consuming process, such as inserting a support jig etc. inside the coil while winding. Become. FIG. 3(c) is different in that winding starts from 8 points in the vertical direction, but the winding direction is the same as in FIG. 3(a), and the work of winding from the upper layer side to the lower layer side is also difficult. Figure 3(b)
This is a method in which the wire is wound from S to the outer circumference, and when passing to the upper layer, it is returned to the innermost circumference as shown by the broken line, so that it is always wound from the inside to the outside. Although this method improves workability, the portion extending from the outermost circumference to the innermost circumference increases by one layer, increasing the thickness of the entire coil in the layer direction, and making it difficult to arrange the shape of the coil. FIG. 3(d) is a winding method similar to that of FIG. 3(c), in which winding is started in the vertical direction. As described above, Fig. 3(d) shows a winding method similar to that shown in (c), which is capable of both improving the winding workability in the vertical direction and making the coil shape orderly. It's difficult. Also, in any of FIGS. 3(a) to 3(d), there are many bends due to transition to the next row or layer. Figure 4 shows
FIG. 3(b) is a diagram showing the state of the 11111 part of the superconducting wire (3a) in the case of FIG. (c) is B-B, (d)
C-C1(e) shows a cross section taken along line D-D and a side view. Moreover, the arrows between figures (b) to (e) indicate the winding order of the superconducting wire (3a), and from (b) to (e)
The arrow pointing in the direction of e) is.

It shows the transition part (5) from side to side, and the double line arrow pointing in the opposite direction shows the transition part (4) from the outermost circumference to the innermost circumference. As shown in Figure 4, there are many bent parts (4a) and (5a) of the superconducting wire (3a) inside the coil.

Furthermore, since the positions of the bending portions (4a) and (5a) differ depending on the layer, the bending operation must be performed at a different position for each turn. However, as mentioned above, these bent parts (4a) and (5a) tend to become points where quench occurs, and the bending work must be done carefully to avoid damaging the superconducting wire (3a). be.

In addition, in any of the winding methods shown in FIGS. 3(a) to 3(d), from the viewpoint of workability, the number of coils that can be wound with continuous superconducting wire (3a) is about 1 to 2. Therefore,
For example, when manufacturing a two-pole field with six hollow-shaped coils per pole, there will be about 5 to 11 connections. However, as mentioned above, this connection has drawbacks such as generating Joule heat and becoming a quench point, and requiring a large space within the coil, so the number of connections must be reduced as much as possible. Don't say anything.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a superconducting field coil that has fewer bent portions and connecting portions that are likely to cause quenching, and that allows easy winding work.

[Summary of the invention]

In the present invention, in a method for manufacturing a superconducting field coil that uses a superconducting wire to form a pair of field poles consisting of a plurality of hollow-shaped coils, one continuous superconducting wire is The superconducting wire is wound around the drum so that it has almost the same length as a drum pair, and multiple pairs are made, leaving one drum in each tram pair and pulling out the superconducting wire from the middle part of each of the other drum pairs. At the same time, multiple superconducting wires are started to be wound in parallel from the lowest layer outermost part of the negative pole hollow coil, wound to the innermost part, and multiple superconducting wires are wound in parallel at the coil end. The wire is made to cross in one layer, and then wound from the inner circumferential side to the outer circumferential side. At this time, the number of horizontally arranged bundles of superconducting wire in the coil end section that has a transition section to the upper layer is reduced to Wind the wire so that the number of wires is greater than the number of wires lined up side by side, cross over to the upper layer at the outermost periphery of the coil end that has a transition part, and then wind again from the outer periphery to the inner periphery, and repeat the same process to form a single pole. After winding the coils for one pole, from the remaining drum of each drum pair, multiple superconducting wires are wound in parallel in the same manner as in the above process, and another coil for one pole is wound. By connecting the ends of the superconducting wire to form a single-pole pair of coils, the number of bends and connections can be reduced and the winding work can be simplified.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 5 to 9. A perspective view of the main parts of the manufactured superconducting field coil is shown in FIG. 1, so please also refer to it.

Now, an example will be explained in which a two-pole electromotive conduction field coil is wound with six hollow-shaped coils per negative pole. First, the fifth
As shown in the figure, one continuous superconducting wire (3a) is connected to the end (3
Wind the wire from b) onto two drums (6) and (7) so that they have almost the same length, forming a pair of drums (8). For example, when the number of horizontal superconducting wires is 4, there are 4 pairs of drums. (8)
Leaving one drum (7) in place, and pulling out the superconducting wire (3a) from the drum-pair middle part (9) of each of the other drums (6),
Four superconducting wires (3a) are simultaneously wound in parallel from a point toward the inner circumferential side. FIG. 6 is a diagram showing this state, and is a developed view of the lowest layer of six coils (10) forming the pole. In addition, in FIG. 6, the drum (6) during one winding is omitted.

In Figure 6, the superconducting wire (3a) has been wound to the innermost part.
crosses from the first layer to the second layer at point E. Next, the four superconducting wires that have passed over the second layer move to eight points in FIG. 7, and are simultaneously wound in parallel from the inner circumferential side to the outer circumferential side, contrary to the first layer. After winding the second layer as shown in FIG. 7, the third layer is wound as shown in FIG. That is, the transition part from the second layer becomes the hunting part near S, and then the third layer is wound from the outer circumferential side to the inner circumferential side in the opposite direction to the second layer, and the second layer is wound at the hatching part near E. It goes to the 4th layer. By repeating the above steps, a coil for one pole is wound.

Next, the remaining four drums (7
) while pulling out the superconducting wire (3a) from the superconducting wire (3a), further winding a coil for one pole in the same manner as described above. And 2
The superconducting field coil is completed by connecting the pole coils.

Figure 9 shows how the two-pole coils are connected, each having been wound in 10 layers.
13) indicates that there are only three locations.

Next, the effect will be explained.

The characteristic feature of this embodiment is that the number of horizontally arranged four bundles of superconducting wires (3a) in the coil end (11) having points S and E is seven, and This is because there are more than 6 pieces. Therefore, in this embodiment, it is possible to cross the glabella over a long distance as shown by hatching near points S and E in FIG. 7, and the bending radius can be increased. Also, horizontal superconducting wires (3a)
Since several four wires are wound at the same time, there is no lateral shift within the slot (1a), and winding from the outer periphery does not require much effort. There is no transition part to (3a), the bending work can be omitted to 11 times, and the shape is very simple. Also in FIG. 8, the number of horizontally arranged bundles of superconducting wires (3a) in the coil end (11) is seven, which is greater than the number of horizontally arranged bundles of the other coil end (12), which is six, and the transition portion between the layers is E, As shown by the hatching near S, it is long and therefore has a large bending radius, and the bending part for crossing over to the horizontal superconducting wire (3a) is unnecessary, making it a very simple shape. There is.

As described above, in this example, a plurality of superconducting m (
At the same time, wind 3a) from the bottom layer and the outermost side.

Since the number of horizontally arranged bundles of superconducting wires (3a) at the coil end having a transition part is greater than the number of horizontally arranged bundles at the other coil end, the transition between layers becomes gentler, and the horizontally arranged superconducting wire (3a)
There is no need for a bending section to cross over to 3a). Therefore, the number of bent parts that are likely to cause quenching is greatly reduced, and the need for careful and labor-intensive bending work is reduced. Since it is simple, the efficiency of winding work is greatly improved. Moreover, the shape of the completed coil is very regular.

Furthermore, since many hollow-shaped coils (work 0) can be wound continuously, and two poles can be wound continuously using two drums (6) and (7), it becomes a point where quench occurs. Only 3 connection parts (13) that are easy to use and take up space.
can be reduced to

It should be noted that the present invention is not limited to the illustrated and described embodiments; for example, superconducting wires (3a) having a large number of wires,
It goes without saying that the present invention can be applied to devices having a large number of slots (1a), and can be implemented with various modifications without changing the gist thereof.

〔Effect of the invention〕

As explained above, in the present invention, the number of bent parts that are likely to cause quenching is reduced to a large extent, the bending work and the winding work at the slot part are greatly streamlined, and the coil shape is improved. It is easy to remove and has the effect of making the completed coil shape neat. Moreover, there is also the effect of reducing the number of connection parts which are likely to be a source of quenching and which take up space by a large number of +41 points.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a main part of a conductive field coil that is a subject of an embodiment of the method of the present invention, and FIG. 2 is a cross-sectional view of one of the saddle-shaped coils shown in FIG. 1. Figures 3(a) to (d) are explanatory diagrams of different conventional methods of winding superconducting field coils, Figure 4 is an explanatory diagram of the winding method in the case of Figure 3(b), and Figure 5 ~ Figure 9 is an explanatory diagram of one embodiment of the method for manufacturing a superconducting field coil of the present invention, Figure 5 shows the state of the drum pair, and Figure 6 ~
FIG. 9 is a developed view showing the state in each step of the coil winding method. 3...Superconducting field coil 3a...Superconducting wire 3b...
・End portions 6, 7...Drum 8...Drum pair 9...Middle part 10...Hill-shaped coil 11.12...Coil end 13...Connection part S...Start of winding E...・End of winding Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In a method for manufacturing a superconducting field coil that uses superconducting wire to form a pair of field poles consisting of multiple hollow-shaped coils, one continuous superconducting wire is connected to two drums with approximately the same length from the end. The superconducting wire is wound up to form a drum pair, and a plurality of these drum pairs are made, leaving one drum in each drum pair and pulling out the superconducting wire from the middle part of each drum pair of the other drum. Start winding multiple superconducting wires in parallel at the same time from the outermost periphery of the bottom layer of the nokura-shaped coil, wind them all the way to the innermost periphery, and then cross the multiple superconducting wires wound in parallel at the coil end to the upper layer. Then, it is wound from the inner circumferential side to the outer circumferential side, and at this time, the number of horizontal lines of the bundle of superconducting wires in the coil end part having the transition part to the two layers is determined by the number of horizontal lines of the bundle of superconducting wires in the other coil end part. Wind the coil so that there are more coils than the number of coils, cross over to the upper layer at the outermost periphery of the coil end that has a transition part, and then wind again from the outer periphery to the inner periphery, and repeat the same process to wind the coil for one pole. After turning,
From the remaining drum of each pair of drums, multiple superconducting wires are wound in parallel in the same manner as in the above-mentioned process to wind another coil for one pole, and then the ends of the superconducting wires are connected to form one pole. A method for manufacturing a superconducting field coil, comprising forming a pair of coils.