JPH051046Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to improvements in superconducting magnets used in nuclear magnetic resonance apparatuses and the like.

[Prior Art] In a commonly used superconducting magnet, as shown in FIG. It is wound on bobbin 5.
FIG. 5 is a sectional view showing a superconducting metal wire 3 wound around a bobbin 5 made of aluminum, for example.
It is made of Nb-Ti alloy or the like, and is wound around a bobbin 5 with an insulating member 4 in between. 6 is superconducting metal wire 3
When wound on the bobbin 5, an insulating sheet such as a polyester sheet or an epoxy sheet is interposed between each layer.

[Problems to be solved by the present invention] In the conventional superconducting magnet configured as described above, when winding the superconducting metal wire 3 around the bobbin 5 as shown in FIG. A method is adopted in which the winding is carried out from one end A to the other end B, and a superconducting magnet constructed in this way is used at the end of the winding of each layer, that is, the layer that moves to the next layer. Since the rising portion is at a constant position as shown in FIG. 7A, there is a drawback that the uniform magnetic flux density distribution in the radial direction becomes non-uniform as shown in FIG. 8.

The present invention was devised in view of the above points, and an object of the present invention is to provide a superconducting magnet with improved uniformity of radial uniform magnetic flux density distribution.

[Means for solving the problem] The configuration of the present invention for solving the problem is that in a superconducting magnet in which a plurality of layers of superconducting wire are wound around a bobbin, each of the superconducting wires at the end of the bobbin The wire is characterized in that a dummy wire having approximately the same cross section as the superconducting wire is interposed below the rising portion between the layers, so that the rising portion between each layer is moved by a constant angular interval and wound.

[Example] An example of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. Incidentally, in FIG. 1, the same components as those of the conventional apparatus shown in FIGS. 4 and 5 are given the same numbers and their explanations will be omitted. In the figure, 7 is a dummy wire used in the rising part of the layer, and the dummy wire 7 is made of the same wire material as the superconducting metal wire 3 or made of copper (Cu), etc., and has the same wire diameter as the superconducting metal wire 3 used. It is formed by the wire diameter.

In the superconducting magnet constructed in this way, when the superconducting metal wire 3 is wound around the bobbin 5, the superconducting metal wire 3 is wound in the second layer at the layer rising portion where it moves to the next layer.
As shown in the figure, the dummy wire 7 having a length L is placed under the superconducting metal wire 3 and wound. The length L of the dummy wire 7 is formed so that when the superconducting metal wire 3 is wound, the rising position of each layer moves at an equal angle. Therefore, since the layer rise position can be distributed evenly instead of at a fixed location as in the conventional device, it is possible to make the magnetic flux density distribution uniform in the radial direction as shown in FIG.

[Effects of the Invention] As described above, according to the present invention, a superconducting magnet with a uniform magnetic flux density distribution in the radial direction is provided.

As described above, in the present invention, when winding a coil into multiple layers, the rising part that occurs at the end of the bobbin is offset by a constant angle interval by interposing a dummy wire underneath, so that each layer is By setting the length of the dummy wire to a desired length in advance, each rising portion can be easily and accurately distributed axially symmetrically, thereby making it possible to make the magnetic flux density uniform in the radial direction. .

[Brief explanation of the drawing]

Fig. 1 is a block diagram of one embodiment of the present invention, Fig. 2 is a diagram for explaining one embodiment, Fig. 3 is a diagram for explaining uniform magnetic flux density distribution, Figs. 4 and 5. 6 to 8 are configuration diagrams for explaining the conventional example.
The figure is a diagram for explaining a conventional example. DESCRIPTION OF SYMBOLS 1... Container, 2... Liquid helium, 3... Superconducting metal wire, 4... Insulating member, 5... Bobbin, 6...
...Insulation sheet, 7...Dummy wire.

Claims (1)

[Scope of utility model registration request] In a superconducting magnet in which a plurality of layers of superconducting wire are wound around a bobbin, a dummy wire with approximately the same cross section as the superconducting wire is interposed below the rising portion between each layer of the superconducting wire at the end of the bobbin, thereby creating a gap between each layer. A superconducting magnet characterized by winding the rising part by moving it at fixed angle intervals.