JPS6161689B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic wire, and more particularly to an electromagnetic wire formed in a substantially circular shape and suitable for use in the fusion device and the like.

Generally, various structures of a circular electromagnetic wire ring are considered, and FIG. 1 shows a schematic structure of the circular electromagnetic wire ring.

As shown in the figure, the electromagnetic wire ring is usually formed into a substantially circular shape by overlapping the conductors 12 with each other and winding them a predetermined number of times from the winding start end 12a to the winding end end 12b. As shown in FIG. 2, this conductor 12 is provided with an interlayer insulating layer 14 in close contact with its periphery, and after this is overlapped and wound, an exterior insulating layer 16 is further provided from the outside. . Therefore, such an electromagnetic wire ring consists of a wound conductor 12
are in close contact with each other via an interlayer insulating layer 14, the contact surfaces of the interlayer insulating layer 14 are adhered to each other, and the periphery thereof is surrounded by an exterior insulating layer 16.

By the way, when the electromagnetic wire ring having such a configuration is energized, an electromagnetic force F that tends to spread in the outer circumferential direction acts as shown in FIG. While the current is small, the electromagnetic force F is also small, and normally the exterior insulation layer 1
6 can sufficiently restrain the electromagnetic wire ring against the electromagnetic force F.

However, in the case of a large electromagnetic wire through which a large current flows, the above-mentioned exterior insulating layer 16 alone cannot restrain the electromagnetic force F that tends to spread the electromagnetic wire. Therefore, the electromagnetic force F is applied to the exterior insulating layer 16, which may cause distortion of the exterior insulating layer 16 and cause dielectric breakdown. In order to solve this problem, it is conceivable to fix the conductors 12 composing the electromagnetic wire ring with insulating pins to compensate for the lack of strength. However, even with this method of fixing the conductors 12 together using insulating pins, the stress applied to the insulating pins is large and cannot withstand the electromagnetic force F. Moreover, the small creepage distance between the electromagnetic wire rings increases the risk of electrical creep.

For this reason, it is necessary to form uneven portions on the conductors to be overlapped, engage the uneven portions, and further cover the outer periphery of the interlayer insulating layer with which the uneven portions engage with a combined insulating layer. There are some that are designed to withstand the electromagnetic force mentioned above.

Such an example is shown in FIG. As shown in the figure, in this example, a convex portion 20 is formed in the middle of a conductor 12A surrounded by an interlayer insulating layer 14, and a conductor 12B (which is also surrounded by an interlayer insulating layer 14) overlapped with this conductor 12A. A recess 22 is formed at a position facing the protrusion 20 of the conductor 12A and 12B, and these recesses 20 and 22 are engaged with each other via an insulating key 24 to fix the conductors 12A and 12B. Then, the uneven portion 2 where these conductors 12A and 12B are engaged
The outer periphery of the interlayer insulating layer 14 in the vicinity of 0 and 22 is further surrounded by a combination insulating layer 28 and firmly fastened and fixed to withstand the electromagnetic force F mentioned above. In addition, 32
is a filler interposed between the conductors 12A and 12B.

However, with such a configuration, the combined insulating layer 28 is provided to swell from the surface of the interlayer insulating layer 14, and furthermore, since the filler 32 is interposed, the thickness of the electromagnetic wire in which the uneven portion is formed is thick. It becomes a thing.

Normally, in a nuclear fusion device, it is necessary to generate a strong magnetic field in a small occupied space, so it is important to make the gap between the electromagnetic wire rings as small as possible.If the space is small, the following problems occur. In other words, in a nuclear fusion device, a vacuum container, a plasma observation port, a support pedestal, a support for holding the electromagnetic wire, etc. are installed around the electromagnetic wire, all of which are connected to the earth potential. There is. Therefore, if there is little space, they will be placed close to each other, and the insulating layer of the electromagnetic coil, where high voltage (30KV) is induced, will deteriorate and be damaged due to corona discharge, resulting in large currents. In electromagnetic coils for use in electromagnetic wires, attention must be paid to both stress breakdown of the insulating layer due to electromagnetic force and damage to the insulating layer due to corona deterioration. Therefore, if the combined insulating layer 28 is provided in a swollen manner around the electromagnetic ray, the structure would be inconvenient for an electromagnetic ray to be installed in something with limited space, such as a nuclear fusion device. However, unless the combined insulating layer 28 is provided, the conductors 12A and 12B cannot be firmly fixed to each other, so this cannot be eliminated.

Therefore, in order to prevent the combined insulating layer from swelling, a stepped structure as shown in FIG. 4 may be considered.

That is, the structure shown in FIG.
B is fixed and the thickness of the interlayer insulating layer 14 near the uneven portion is made into a stepped structure, and is formed thinner than the other interlayer insulating layers 14, and this thinly formed interlayer insulating layer 14
The combined insulating layer 28 is provided on the surface of the electromagnetic wire ring to prevent the combined insulating layer 28 from bulging, thereby substantially reducing the thickness of the electromagnetic wire ring.

However, with such a configuration, the longitudinal end portion A of the combined insulating layer 28 and the stepped portion B of the interlayer insulating layer 14 do not come into close contact with each other, leaving a slight gap.
Therefore, the insulation thickness between ground is only between B and C, and this thickness will cause dielectric breakdown.

The present invention has been made in view of the above-mentioned points, and its purpose is to be able to firmly fix conductors together and sufficiently withstand electromagnetic force, and to be able to arrange the conductors without any particular trouble even if there are spatial restrictions. The purpose of the present invention is to provide an electromagnetic wire ring which is capable of producing high-performance electromagnetic wires and has excellent insulation performance.

The present invention gradually reduces the thickness of the interlayer insulating layer in the vicinity where the concavo-convex portion of the conductor on which the combined insulating layer is installed is engaged, by forming the surface side into a tapered shape, and the combined insulating layer is installed here. The interlayer insulating layer side of the combined insulating layer is formed into a tapered shape, and the thickness of the combined insulating layer provided around the interlayer insulating layer is approximately the same as the thickness of other interlayer insulating layers. This was done to achieve the intended purpose.

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings. Incidentally, the same reference numerals are used for the same parts as in the past.

FIG. 5 and FIG. 6 show an embodiment of the electromagnetic wire ring of the present invention.

As shown in the figure, a stepped portion 18 is formed in the conductor 12A constituting the electromagnetic wire ring, and a convex portion 20 is provided in the middle thereof. On the other hand, a stepped portion 18 is similarly formed on the conductor 12B superimposed thereon, and a recessed portion 22 is provided at a position facing the convex portion 20. These convex parts 2
0 and the recess 22 are formed by machining the conductors 12A and 12B. Then, the uneven portion 2
0 and 22 through an insulating key etc., and
2A and 12B are fixed.

FIG. 6 shows this state, and as shown in the figure, the convex portion 20 provided on the conductor 12A and the conductor 1
In this embodiment, the interlayer insulating layer 14 in the vicinity of where the protrusions 20 and the recesses 22 are engaged is formed into a tapered shape. , its thickness is gradually thinned. A combination insulating layer 28 having an insulating function is provided in a portion of the interlayer insulating material 14 that is formed into a tapered shape and becomes thinner in stages.
The sides are also formed into a tapered shape in the same manner as above, and the tapered surfaces of the two are made to face each other and match. Furthermore, the thickness of the combined insulating layer 28 provided around the interlayer insulating layer 14 is approximately the same as the thickness of the other interlayer insulating layer 14 (interlayer insulating layer not formed in a tapered shape). Furthermore, a corona shield layer 30 is provided on the surfaces of the combined insulating layer 28 and the interlayer insulating layer 14. FIG. 7 shows the cross section of FIG. 6, and this figure also shows that the conductors 12A and 12
It can be seen that an interlayer insulating layer 14 that is in close contact with B is provided, and a corona shield layer 30 is provided outside of this interlayer insulating layer 14. The interlayer insulating layer 14 of the electromagnetic coil described above is generally formed by winding a tape-shaped material such as mica tape, film tape, or glass tape around the conductors 12A and 12B. In this case, the interlayer insulating layer 14 is usually provided for each turn of the conductor constituting the electromagnetic coil, and has a sufficient thickness to withstand the ground voltage.

By having the configuration of this embodiment as described above,
The conductors 12A and 12B are engaged at the uneven portions 20 and 22, and since the outer periphery of the interlayer insulating layer 14 in the vicinity thereof is surrounded by the combined insulating layer 28, the conductors 12A and 12B are fixed firmly enough to withstand large electromagnetic forces. Can be resisted.
Therefore, spreading due to the electromagnetic force exerted by energizing the electromagnetic coil can be prevented, thereby preventing insulation damage and also having the effect of eliminating electrical creep. In addition, the surface of the interlayer insulating layer 14 is formed into a tapered shape, and the combined insulating layer 28 whose matching surface is formed into a tapered shape is arranged, and the combined thickness of the two is formed into a tapered shape. The thickness is almost the same as that of the insulating layer 14, so that the combined insulating layer 28 does not swell and does not occupy any wasted space for installing the electromagnetic wire, so it is the insulating layer of the electromagnetic wire in which high voltage is induced. It has the advantage that it can be used in nuclear fusion devices, etc., without worrying about deterioration or damage due to corona discharge. Moreover, the adhesion parts of the tapered interlayer insulating layer 14 and the combined insulating layer are gradually thinned, so that sufficient adhesion can be achieved, so that no voids are created or dielectric breakdown occurs, and the gap between D and E of the tapered part is reduced. If the distance is set appropriately according to the working voltage of the electromagnetic wire, the dielectric breakdown voltage value of this part will increase and it can withstand practical use (this has been confirmed by experiment). In addition, in this configuration,
It has been confirmed that it can withstand sufficient mechanical properties (bending, tensile) evaluation experiments using electromagnetic force. Furthermore, even if there is a slight void or peeling at the interface between the tapered interlayer insulating layer 14 and the combined insulating layer 28, the corona shield layer 30 will be provided on the surface, and this will prevent the boundary D between the two from forming. Since the electric field distribution of the electromagnetic wire is relaxed due to the extension to the interlayer insulating layer 14,
Tapered interlayer insulation layer 14 and combination insulation layer 28
The voltage that flashes over increases at the interface. Therefore, sufficient reliability can be obtained by appropriately selecting the distance between D and E of the tapered portion.

In this example, an electromagnetic wire ring made up of two conductors was explained, but the same effect can be obtained with a similar structure for a wire ring made of three or more conductors. A convex part provided in the part,
Of course, the same effect can be obtained even if the positions of the recesses are reversed and the combination is reversed.

According to the electromagnetic coil of the present invention described above, the thickness of the interlayer insulating layer in the vicinity where the uneven portion of the conductor on which the combined insulating layer is installed is engaged is stepped by forming the surface side into a tapered shape. In addition, the interlayer insulation layer side of the combination insulation layer installed here is formed into a tapered shape, and the thickness of the combination insulation layer installed around this interlayer insulation layer is equal to that of other interlayer insulation layers. Since the thickness is almost the same as that of the insulating layer, the conductors are firmly fixed together and can withstand electromagnetic force, and the combined insulating layer does not swell, so there is no problem even if there are spatial restrictions. This type of electromagnetic coil can be easily placed and has excellent insulation performance because it does not cause dielectric breakdown.

[Brief explanation of the drawing]

Figure 1 is a perspective view schematically showing a general circular electromagnetic wire ring, Figure 2 is a cross-sectional view of Figure 1, and Figure 3 is a cross-sectional view of Figure 1.
The figure is a cross-sectional perspective view showing the detailed structure of a conventional electromagnetic wire, FIG. 4 is a cross-sectional view showing the detailed structure of another conventional example, and FIG. 5 is a schematic diagram of the circular electromagnetic wire of the present invention. 6 is a cross-sectional perspective view showing the detailed structure of the electromagnetic wire shown in FIG. 5, and FIG. 7 is a cross-sectional view taken from FIG. 6. 12, 12A, 12B... Conductor, 14... Interlayer insulating layer, 18... Paralleled portion, 20... Convex portion, 22
... recess, 24 ... insulation key, 28 ... combination insulating layer, 30 ... corona shield layer.

Claims (1)

[Scope of Claims] 1. A convex portion is formed in the middle of a conductor, a concave portion is formed at a position opposite to the convex portion of a conductor superimposed on this conductor, and these concave and convex portions are engaged, and a conductor is layered and wound multiple times with an interlayer insulating layer interposed therebetween to form a substantially circular shape, and a combination insulating layer is provided around the outer periphery of the interlayer insulating layer in the vicinity where the uneven portions of the conductor are engaged. In the electromagnetic wire ring, the thickness of the interlayer insulating layer on which the combined insulating layer is installed is gradually reduced by forming the surface side into a tapered shape, and the thickness of the interlayer insulating layer on which the combined insulating layer is installed is gradually reduced. The insulating layer side is formed into a tapered shape,
An electromagnetic wire ring characterized in that the thickness of the combined insulating layer provided around the interlayer insulating layer is approximately the same as the thickness of the other interlayer insulating layers. 2. The electromagnetic wire according to claim 1, characterized in that a corona shield layer is provided on at least the surface of the combined insulating layer.