JPH0383303A - Magnetic-field generating coil - Google Patents

Abstract

PURPOSE:To prevent the expansion of the main body of a coil in the direction of the radius due to hoop force by forming deformation preventing projection parts which are made to extend in the direction in which conductors are not overlapped and in the different direction from the winding direction of the conductor of the main body of the coil, and linking the deformation preventing projection parts with a linking means. CONSTITUTION:Deformation preventing projection parts 22 are made to extend upward and downward in the vicinities of feeding parts 6 of a main body 2 of a coil at a right angle with the direction of the currents. Thus the parts 22 are formed. In order to link the deformation preventing projection parts 22, the deformation preventing projection parts 22 are overlapped, and key holes 25 are made to agree. Under this state, a key 23 is inserted and fixed. In this constitution, stress which is received when a current flows through the coil main body 2 and hoop force is applied is received with the entire cross section of the key 23 which is inserted and fixed in the deformation preventing projection parts 22 that are made to extend on both side surfaces of a strip- shaped conductor 1. Thus, the radial expansion of the coil main body 2 by the hoop force can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention (Field of Industrial Application) The present invention relates to a magnetic field generating coil such as a voloidal coil used in a nuclear fusion device, for example.

(Prior Art) A strong magnetic field generating coil such as a boroidal coil is supplied with a larger current than a normal coil, so the hoop force that tends to spread the coil itself in the radial direction becomes larger.

In particular, for one-turn coils, the hoop force is so large that it becomes difficult to maintain the shape of the coil itself.

For this reason, as an example of a conventional voloidal coil, there is one constructed as shown in FIG. 10 (perspective view). That is, in the case where the coil body 2 is constructed by winding the strip conductor 1 in a loop shape a predetermined number of times (in this case, two times) and providing an insulating layer (not shown) between the overlapping layers of the conductors, the hoop stop structure is as follows. It is constructed as described.

11 is an enlarged plan view showing the main part of FIG. 10, and FIG. 12 is an exploded perspective view of FIG. 11. As is clear from these figures, the conductor end of the coil body 2 A power supply section 6 is formed for supplying current to each of the two. Then, protrusions 10 and recesses 11 that can be fitted into each other are respectively formed on the plate surface of the conductor 1 near the power feeding part 6 of the coil body 2 and in the radial direction of the coil where the band-shaped conductors 1 overlap each other. After fitting, a rectangular cylindrical key insulator 4 is fitted into the gap existing between the two, and a key 3 having a rectangular cross section is inserted into the rectangular cylindrical key insulator 4.

With the above configuration, when a current flows through the coil body 2, a hoop force is generated in the upper conductor 1 in FIG. 11 in the right direction, and a hoop force is generated in the lower conductor 1 in the left direction. arise. The hoop force in both directions is transmitted through the key 3 and the key insulator 4, which are provided in the gap between the convex portion 10 and the four portions 11, thereby preventing deformation of the coil body 2 due to the hoop force.

(Problems to be Solved by the Invention) In the example of the conventional magnetic field generating coil described above, stress due to the hoop force is applied to the key 3 and the key insulator 4, which are disposed in the gap between the convex MIO and the concave portion 11 of the conductor l. concentrate. In this case, since the recess 11 has a small cross section of about half the thickness of the strip conductor 1, there is a problem in terms of mechanical strength.

In addition, since the conductor cross-sectional area decreases in the fourth part 11, the current density becomes larger compared to other parts, which causes structural problems such as locally large losses and high temperatures. be.

The present invention generates a magnetic field that does not cause concentration of stress on specific parts of the linear conductor that constitutes the coil body, does not cause large losses locally, and prevents the coil body from expanding in the radial direction due to hoop force. The purpose is to provide coils.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention includes forming a linear conductor into a loop and winding it a predetermined number of times, and forming an insulating layer between the layers where the linear conductors overlap. In a magnetic field photogenic coil in which a coil main body is obtained, and a power feeding part is formed for supplying current to one end and the other end of the coil main body, respectively, in the vicinity of the power feeding part of the coil main body or in the linear shape of the coil main body. At a position where the conductors overlap, a deformation prevention protrusion extends from at least the outer circumferential surface of the linear conductor where the power feeding section is formed in a direction in which the conductors do not overlap, unlike the winding direction of the conductors of the coil body. , and these deformation prevention protrusions are connected to each other by a connecting means. Further, a key or a binding material is used as the connecting means.

(Function) According to the present invention, the deformation prevention member extends at least from the outer peripheral surface of the linear conductor in which the power feeding portion is formed in a direction in which the conductors do not overlap, unlike the winding direction of the conductors of the coil body. The deformation prevention projections are connected to each other by a connecting means, so the mechanical strength of the hoop stopper structure that prevents the coil body from expanding in the radial direction due to the hoop force is greater than that of other conductors. It does not become weaker than its parts.

Furthermore, by increasing the cross-sectional area of the conductor, the current density becomes smaller and the loss becomes smaller, and as a result, it is possible to avoid a situation where the loss locally increases and the temperature of that part increases. Furthermore, since the deformation prevention protrusions are connected using a key or binding material,
Concentration of stress on a small cross section, which was a problem in the past, can be avoided, making it possible to increase mechanical strength.

(Implementation flJ) Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the magnetic field generating coil of the present invention, in which the structure of the coil body 2 is the same as that of the conventional example described above, in which the strip conductor 1 is looped a predetermined number of times (
Here, the conductors are wound once), and an insulating layer (not shown) is provided between the overlapping layers of the conductors. Further, a power supply section 6 for supplying current is formed at both ends of the coil body 2 at the start and end of the conductor winding, respectively.

In the coil having such a configuration, a deformation prevention protrusion 22 is formed near the power feeding part 6 of the coil body 2 and extends vertically at right angles to the current direction. 22 are connected to each other, the structure is as follows.

Figures 2 to 4 are diagrams for explaining this, and the second
3 and 3 are an enlarged front view and an enlarged plan view of the deformation prevention protrusion 22 shown in FIG. 1, and FIG. 4 is an exploded perspective view of the same portion 22.

A circular key hole 25 is formed in each of the deformation prevention protrusions 22, and a cylindrical key insulator 24 for forming an insulating layer is formed so as to be insertable into the key hole 25. Furthermore, a cylindrical key 23 that can be inserted into the hollow part of this key insulator 24 is provided.
form.

In such a structure, the key member in which the key 23 is inserted into the hollow part of the key insulator 24 is stacked with the deformation prevention protrusion 22 formed on the conductor 1 and the key hole 25 is aligned. insert.

By doing so, the stress received when a current flows through the coil body 2 and a hoop force acts is absorbed by the key 23 inserted and fixed into the deformation prevention projections 22 extending on both sides of the strip conductor 1. This is larger than the area of the cross section that is affected when the hoop force is applied in the conventional example, so compared to the conventional coil, it is possible to prevent the coil body 2 from expanding in the radial direction due to the hoop force. It can improve the yield strength.

Furthermore, since the deformation prevention protrusion 22 has a larger conductor cross-sectional area than the other coil main body 2, the current density in this portion is smaller than that of a conventional coil, and energy loss is reduced.

Therefore, the temperature rise of the conductor 1 in the portion of the deformation prevention protrusion 22 is caused by the increase in the temperature of the conductor 1 in the conventional coil hoop force.
, key 3, and key insulator 4).

Next, other embodiments of the present invention will be described with reference to FIGS. 5 to 9. Fig. 5 is an 8+ perspective view showing the entire structure, Fig. 6 is a perspective view enlarging only the main parts of Fig. 5, Fig. 7 is a front view of Fig. 5, and Fig. 8 is a view of Fig. 7. FIG. 9 is a cross-sectional view taken along the line ①-■ and viewed in the direction of the arrow, and a side view of FIG. 7. This embodiment is a 3-turn coil, which is a strip conductor 1 forming a loop, with deformation prevention protrusions 22 formed in each turn, and these deformation prevention protrusions 22 being used when winding the coil body. It is overlapped with the power feeding part 26 formed at the beginning and the end of the winding, and an insulator 28 and a corresponding part 29 are provided around this, and are fastened together with a binding material, for example, a binding tape 27.

This embodiment also provides the same effects as the previous embodiment.

In the above-described embodiments, a strip-shaped coil conductor is used, but the coil conductor is not limited to this, and any linear coil conductor may be used. In addition, in the embodiment, the deformation prevention protrusions 22 were formed on all the conductors forming each turn even when the number of turns in the coil body was three or more, but the deformation prevention protrusions 22 were formed on all the conductors forming each turn. The deformation prevention protrusion may be formed only on the conductor. Further, the deformation prevention protrusion does not need to be perpendicular to the winding direction of the coil body, and may have any shape as long as the deformation prevention protrusion can be connected by some connecting means.

[Effects of the Invention] According to the present invention described above, the wire conductor extending from at least the outer circumferential surface of the linear conductor in which the power feeding section is formed in a direction in which the conductors do not overlap, unlike the winding direction of the conductors of the coil body, Since the deformation prevention protrusions are formed and the deformation prevention protrusions are connected to each other by a connecting means, stress concentration does not occur in a specific part of the linear conductor constituting the coil body, and the deformation prevention protrusions are It is possible to provide a magnetic field generating coil that does not cause locally large losses and can prevent the coil body from expanding in the radial direction due to hoop force.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the magnetic field generating coil according to the present invention, and FIGS. 2 to 4 are an enlarged front view, an enlarged plan view, and an enlarged exploded perspective view of the deformation prevention protrusion shown in FIG. 1, respectively. , FIG. 5 is a perspective view showing another embodiment of the magnetic field generating coil according to the present invention, FIG. 6 is an enlarged perspective view of the deformation prevention protrusion shown in FIG. 5, and FIG. 7 is an enlarged perspective view of the main part of FIG. An enlarged front view, FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7 and seen in the direction of the arrow, FIG. 9 is a side view of FIG. 7, and FIG. A perspective view showing an example, and FIGS. 11 and 12 are a plan view and an exploded perspective view, respectively, showing enlarged convex portions and concave portions of FIG. 10. DESCRIPTION OF SYMBOLS 1... Band-shaped conductor, 2... Coil main body, 6... Power feeding part, 22... Deformation prevention protrusion, 23... Key 24
... Key insulator, 25 ... Key hole, 26 ... Power supply section, 27 ... Bind tape, 28 ... Insulator, 2
One...that thing.

Claims (3)

[Claims] (1) A wire conductor is wound into a loop shape a predetermined number of times, an insulating layer is formed between the layers where the wire conductors overlap, and a coil body is obtained. In a magnetic field generating coil that forms a power feeding section for supplying power, in the vicinity of the power feeding section of the coil body or at a position where the linear conductors of the coil body overlap, unlike the winding direction of the conductor of the coil body, the conductors overlap each other. A magnetic field formed by forming deformation prevention protrusions extending from the outer peripheral surface of at least the linear conductor in which the power feeding section is formed in non-overlapping directions, and connecting the deformation prevention protrusions with each other by a connecting means. generation coil. (2) The magnetic field generation according to claim 1, wherein the connecting means is formed by forming a key insertion hole in each deformation prevention protrusion, and inserting a key having an insulating layer on the outer peripheral surface into the key insertion hole. coil. (3) The magnetic field generating coil according to claim 1, wherein the connecting means is formed by winding each deformation prevention protrusion with a bind material.