JP2002050513A - Toroidal magnetic-field coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a toroidal magnetic-field coil in which winding size can be reduced by making the stresses in the toroidal winding uniform. SOLUTION: The toroidal winding is provided with a plurality of winding conductors, that are supported with prescribed mutual spacing by a radial plate, so that the spacing between winding conductors of the toroidal winding is changed, depending on the position in the toroidal winding with the stresses due to electromagnetic force during operation being uniform in the radial plate. The winding conductors are supported by being accommodated in slots of the radial plate. The spacing between the winding conductors is specified by the width of the part of the radial plate existing between winding conductors and the cross-sectional shape of the winding conductors or the distance between the centers of the conductors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a toroidal magnetic field coil, and more particularly to a toroidal magnetic field coil used in a nuclear fusion device.

[0002]

2. Description of the Related Art In the cross-sectional structure of a conventional toroidal magnetic field coil shown in cross section in FIGS. 6 and 7, reference numeral 1 denotes a toroidal winding, 2 denotes a coil case, and 3 denotes a backing cylinder. 8 and 9 show the toroidal winding 1.
FIG. 4 is a winding conductor, 5 is a radial plate, 6 is a radial plate Y direction thin part,
Reference numeral 7 denotes a thin portion in the X direction of the radial plate.

When a current flows through such a toroidal magnetic field coil, an electromagnetic force (centripetal force and vertical force) acts on the toroidal winding 1. The coil case 2 and the radial plate 6 transmit and support such an electromagnetic force. In the case of the backing cylinder supporting system as shown in FIG. 6, the centripetal force is transmitted and supported as shown by the arrow in FIG. In the case of the wedge support method, the centripetal force is transmitted and supported as shown by the arrow in FIG.

[0004]

In the conventional toroidal winding, conductors having the same shape and dimensions are arranged at equal intervals in the X and Y directions shown in FIG.
The stress generated in the radial plate 5 by the centripetal force due to the electromagnetic force during operation is high on the inner peripheral side of the toroidal magnetic field coil indicated by the arrow A in FIG. 9 and lower on the side indicated by the arrow B, that is, the outer peripheral side of the toroidal magnetic field coil. That is, the outer peripheral side (B
The radial plate 5 on the side) is unnecessarily excessive as an electromagnetic force supporting structure, and has a problem in terms of dimensions. In FIG. 9, L is the dimension or length of the radial plate 5 in the X direction, W is the dimension or width of the radial plate 5 in the Y direction, and D is
Is the diameter of the winding conductor 4, and dL is the distance between the winding conductors.
In the case of the backing cylinder support system as shown in FIG. 10, the stress in the thin portion of the radial plate 5 in the Y direction is high on the inner peripheral side (A side) and lower on the outer peripheral side (B side). Also,
In the case of the wedge supporting method as shown in FIG. 11, the stress of the radial plate thin portion (X direction, Y direction) is high on the A side in FIG. 9 and low on the B side.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the conventional toroidal magnetic field coil and to make the stress acting on the radial plate uniform and to reduce the size of the winding. Getting the coil.

[0006]

According to the present invention, the means for solving the above-mentioned problems are as follows. (1) Toroidal windings each having a radial plate having a number of teeth forming a number of slots therebetween, and a number of winding conductors housed in the slots and supported at predetermined intervals, The shape and spacing of the toroidal windings in the toroidal windings are adjusted so that the stress caused by the electromagnetic force acting on the windings during operation is distributed substantially evenly in the radial plate. A toroidal magnetic field coil characterized by being changed according to the following.

(2) The radial plate has a large number of teeth forming a large number of slots therebetween, and can accommodate the winding conductor in the slot and support it at a predetermined interval.

(3) The spacing between the winding conductors can be defined by the width of the radial plate between the winding conductors.

(4) The interval between the winding conductors can be defined by the cross-sectional shape of the winding conductor and the distance between the conductor centers.

(5) The interval between the winding conductors can be defined by the cross-sectional shape of the winding conductor or the width of the radial plate.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 The outline of the toroidal magnetic field coil of the present invention is the same as that shown in FIGS. 6 to 9, except for the structure of the toroidal winding 1, especially the shape and arrangement of the winding conductor supported on the radial plate. That is, in the toroidal magnetic field coil, the toroidal windings 1 are arranged in a donut shape, and are arranged close to each other at the inner diameter portion in the circumferential direction. Each toroidal winding 1
Includes a plurality of winding conductors 11 and 12 extending in parallel to the direction of the toroidal winding 1 as shown in FIG. 1 and a radial plate 13 supporting the winding conductors 11 and 12 at a predetermined interval from each other. Have. The radial plate 13 is a substantially rectangular plate-like member, and has a shape as shown in FIG. 8 depending on the position of the toroidal winding 1, and forms a cross-sectional shape of the toroidal winding 1.

In the case of the toroidal winding 1 shown in FIG. 8, a rectangular plate similar to the five rectangular plates 13 of the same shape is juxtaposed to form a rectangle, and a substantially trapezoidal shape having one side inclined at both ends of the rectangle. Radial plate is provided, and has a substantially trapezoidal cross section as a whole. As shown in FIG. 1, a plurality of substantially U-shaped slots 14 for accommodating and supporting one winding conductor 11 and 12 are formed in the radial plate 13, and the slots 14 are left between the slots 14. The part is the teeth part 1
A filling plate 16 is inserted and fixed above the stored winding conductors 11 and 12 so that the winding conductor 11 is restrained so as not to be separated from the slot 14.

In the toroidal magnetic field coil of the present invention, the shape of the radial plate 13 and the winding conductor 11
By varying at least one of the cross-sectional shapes of and 12 in accordance with the position in the toroidal winding 1,
The distance between the winding conductors 11 and 12 is changed in accordance with the position in the toroidal winding 1 so that the winding conductor 11
The stress in the radial plate 13 due to the electromagnetic force acting on the radial plates 13 and 12 is substantially uniformly distributed in the radial plate 13.

In FIG. 1, L1 is the dimension of the radial plate in the X direction, that is, the length, and W1 is the Y of the radial plate.
The directional dimension or width, D is the diameter of the winding conductor, D1 is the minor diameter of the winding conductor having an elliptical cross section, and dL is the distance between the winding conductors in the X direction. In the embodiment shown in FIG. 1, a large part of the electromagnetic force acting on the inner peripheral side of the toroidal winding 1 indicated by an arrow A corresponding to approximately half of the radial plate 13, that is, the winding conductors 11 and 12 and the radial plate 13. , The cross-sectional shape of the winding conductor 12 is an elliptical shape that is long in the X direction, and the winding conductor 1 on the small electromagnetic force side indicated by the arrow B, that is, on the outer peripheral side.
1 is a perfect circle. Distance d between winding conductors in X direction
L is equal over the entire radial plate 13, and in the Y-direction, the distance dW1 between the winding conductors on the inner peripheral side is larger than the distance dW1 between the winding conductors on the outer peripheral side.

With such a configuration, the toroidal winding 1 on which a large electromagnetic force acts due to a large current flowing through the winding conductor.
On the inner peripheral side, large electromagnetic force is taken up by the large area of the radial plate 13, so that stress is not concentrated and is distributed almost uniformly over the entire radial plate. In other words, the dimension dW1 of the stress receiving portion of the radial plate can be reduced on the outer peripheral side where the stress is small, and the cross-sectional dimension of the entire toroidal winding can be reduced. In the case of the embodiment of FIG. 1, the width W1 of the radial plate can be reduced.

Embodiment 2 In the embodiment shown in FIG. 2, on the inner peripheral side of the radial plate 13, the cross-sectional shape of the winding conductor 11 is a perfect circle, and on the outer peripheral side, the cross-sectional shape of the winding conductor 12 is longer in the Y direction. It is oval. The distance dL between the winding conductors in the X direction is equal to the entire radial plate 13, and the distance between the winding conductors in the Y direction is small on the outer peripheral side (dW
2) Large on the inner circumference side (dW1).

With this configuration, on the inner peripheral side of the toroidal winding on which a large electromagnetic force due to a large current flowing through the winding conductor acts, a large electromagnetic force is held by a large area of the radial plate. Therefore, stress concentration does not occur, and the stress is distributed almost uniformly over the entire radial plate. Therefore, the dimension of the stress receiving portion of the radial plate can be reduced on the outer peripheral side where the stress is small, and the cross-sectional dimension of the entire toroidal winding can be reduced. In the case of the embodiment of FIG.
3, the length L2 can be reduced.

Embodiment 3 In the embodiment shown in FIG. 3, the cross-sectional shape of the winding conductor 11 is a circle having the same size over the entire radial plate 13, and the distances dW1 and dW3 between the winding conductors in the Y direction are equal. On the inner peripheral side, which is a large electromagnetic force side, the distance dL between the winding conductors in the X direction
2 is larger than the distance dL1 between the winding conductors. In other words, the pitch of the winding conductors 11 is relatively large on the inner peripheral side.

With this configuration, on the inner diameter side of the toroidal winding on which a large electromagnetic force due to a large current flowing through the winding conductor acts, a large electromagnetic force is received by a relatively large portion of the area of the radial plate. Because it is held
There is no stress concentration, and the stress is distributed almost evenly over the entire radial plate. Therefore, the dimension of the stress receiving portion of the radial plate can be reduced on the outer peripheral side where the stress is small, and the cross-sectional dimension of the entire toroidal winding can be reduced. In the case of the embodiment of FIG. 3, the length L3 of the radial plate 13 can be reduced.

Embodiment 4 In the embodiment shown in FIG. 4, on the inner peripheral side of the radial plate 13, the cross-sectional shape of the winding conductor 11 is a perfect circle, and on the outer peripheral side, the cross-sectional shape of the winding conductor 12 is longer in the Y direction. It is oval. The distance between the winding conductors in the X direction is the inner circumferential side of the radial plate (dL4)
Is larger than the outer circumference (dL3), and the distance between the winding conductors in the Y direction is larger on the inner circumference (dW1) and smaller on the outer circumference (dW4).

With this configuration, on the inner peripheral side of the toroidal winding on which a large electromagnetic force due to a large current flowing through the winding conductors 11 and 12 acts, a large electromagnetic force is applied to a portion of the radial plate 13 where the area is large. Therefore, stress concentration does not occur, and the stress is distributed almost uniformly over the entire radial plate 13. Therefore, the dimension of the stress receiving portion of the radial plate can be reduced on the outer peripheral side where the stress is small, and the cross-sectional dimension of the entire toroidal winding can be reduced. In the case of the embodiment of FIG. 4, the length L4 of the radial plate 13 can be reduced.

Embodiment 5 In the embodiment shown in FIG. 5, on the inner peripheral side of the toroidal winding corresponding to about half of the radial plate 13, the cross-sectional shape of the winding conductor 12 is X.
The shape of the winding conductor 11 is a perfect circle on the outer peripheral side. The spacing between the winding conductors in the X direction is larger on the inner circumferential side (dW) of the radial plate than on the outer circumferential side (dW5), and the spacing between the winding conductors in the Y direction is the inner circumferential side (dL6).
At the outer periphery side (dL5).

With this configuration, on the inner peripheral side of the toroidal winding on which a large electromagnetic force due to a large current flowing through the winding conductors 11 and 12 acts, a large electromagnetic force is applied to a portion of the radial plate 13 where the area is large. Therefore, stress concentration does not occur, and the stress is distributed almost uniformly over the entire radial plate 13. Therefore, the dimension of the stress receiving portion of the radial plate 13 can be reduced on the outer peripheral side where the stress is small, and the cross-sectional dimension of the entire toroidal winding can be reduced. In the case of the embodiment of FIG. 5, the width W5 and the length L5 of the radial plate 13
Can be reduced.

In all of the embodiments described so far, the cross-sectional shape of the winding conductor is circular or elliptical. However, the present invention can be applied to various other cross-sectional shape winding conductors such as a rectangular cross-section. The same applies to the case of using in combination.

[0025]

As described above, the effects of the toroidal magnetic field coil of the present invention are as follows. (1) Toroidal windings each having a radial plate having a number of teeth forming a number of slots therebetween, and a number of winding conductors housed in the slots and supported at predetermined intervals, The shape and spacing of the toroidal windings in the toroidal windings are adjusted so that the stress caused by the electromagnetic force acting on the windings during operation is distributed substantially evenly in the radial plate. Therefore, a toroidal magnetic field coil can be obtained in which the stress on the radial plate is made uniform and the size of the winding can be reduced.

(2) The radial plate has a large number of teeth forming a large number of slots therebetween, and the winding conductor can be accommodated in the slot and supported at a predetermined interval. The stress on the radial plate can be made uniform and the size of the winding can be reduced without changing the configuration of the winding conductor of the coil.

(3) Since the spacing between the winding conductors can be defined by the width of the radial plate between the winding conductors, the radial length of the toroidal magnetic field coil can be changed without changing the configuration of the winding conductors. The stress on the plate can be made uniform, and the size of the winding can be reduced.

(4) The spacing between the winding conductors can be defined by the cross-sectional shape of the winding conductors and the distance between the center of the conductors. Such stress can be made uniform and the size of the winding can be reduced.

(5) The interval between the winding conductors can be defined by the cross-sectional shape of the winding conductors or the width of the radial plate. Such stress can be made uniform and the size of the winding can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a winding conductor supported on a radial plate of one embodiment of a toroidal magnetic field coil of the present invention.

FIG. 2 is a schematic sectional view showing a winding conductor supported on a radial plate of another embodiment of the toroidal magnetic field coil of the present invention.

FIG. 3 is a schematic sectional view showing a winding conductor supported on a radial plate of still another embodiment of the toroidal magnetic field coil of the present invention.

FIG. 4 is a schematic sectional view showing a winding conductor supported on a radial plate of still another embodiment of the toroidal magnetic field coil of the present invention.

FIG. 5 is a schematic sectional view showing a winding conductor supported on a radial plate of another embodiment of the toroidal magnetic field coil of the present invention.

FIG. 6 is a schematic sectional view showing a toroidal winding of a general backing support type of a toroidal magnetic field coil.

FIG. 7 is a schematic cross-sectional view showing a wedge-supported toroidal winding of a general toroidal magnetic field coil.

FIG. 8 is a schematic sectional view showing details of a toroidal winding of a conventional toroidal magnetic field coil.

9 is a schematic cross-sectional view showing a radial plate of the toroidal winding of FIG. 8 and a winding conductor supported thereon.

FIG. 10 is a schematic diagram showing an electromagnetic force in the toroidal winding of FIG. 6;

FIG. 11 is a schematic view showing an electromagnetic force in the toroidal winding of FIG. 7;

[Explanation of symbols]

1 toroidal winding, 11, 12 winding conductor, 13 radial plate, 14 slot, 15 teeth portion, length of L1 radial plate, width of W1 radial plate, diameter of D winding conductor, minor diameter of D1 winding conductor , DL The distance between the winding conductors in the X direction, dW the distance between the winding conductors on the inner peripheral side, and dW1 the distance between the winding conductors on the outer peripheral side.

Claims (5)

[Claims] 1. A toroidal winding having a radial plate and a plurality of winding conductors supported at predetermined intervals by the radial plate, wherein a stress caused by an electromagnetic force acting on the winding conductor during operation is provided. Wherein the shape and spacing of the winding conductors of the toroidal winding are changed in accordance with positions in the toroidal winding so that are distributed substantially uniformly in the radial plate. 2. The radial plate according to claim 1, wherein the radial plate has a number of teeth forming a number of slots therebetween, and the winding conductor is housed in the slot and supported at a predetermined interval. 2. The toroidal magnetic field coil according to 1. 3. The toroidal magnetic field coil according to claim 1, wherein an interval between the winding conductors is defined by a width dimension of the radial plate between the winding conductors. 4. The toroidal magnetic field coil according to claim 1, wherein an interval between the winding conductors is defined by a cross-sectional shape of the winding conductor and a distance between conductor centers. 5. The toroidal magnetic field coil according to claim 1, wherein an interval between the winding conductors is defined by a cross-sectional shape of the winding conductor or a width of a radial plate.