JPH04186885A - Permanent current switch - Google Patents

Abstract

PURPOSE:To make it possible to prevent coil winding from loosening and enhance the reliability of a permanent current switch even when a thick coil is used by mounting a coil frame after having wound up a first coil layer and fixing the coil to the first coil frame with a second coil frame and guiding the coil in reverse direction. CONSTITUTION:A coil bobbin 32 is mounted to a coil winding machine where the base end 33a of a coil 33 is fixed with a coil support fixture 36 and the coil 33 is wound up while tensile force is applied to a coil winding side of the coil bobbin 32. When the coil 33 reaches the end face 32a of the coil bobbin 32, the coil 33 is brought into contact with the peripheral surface of a first coil frame 43 with the tensile force maintained where the coil winding machine is adapted to come to a halt under this condition. A second coil frame 44 is fixed so that the coil 33 placed in close contact with the peripheral surface of the first coil frame 43 may be thrust against the first coil frame 43 and fixed. The coil winding machine is rotated reversely as it is while the coil 33 whose part is not placed into close contact with the peripheral section of the first coil frame 43, is placed into contact with the second coil frame 44 along its peripheral surface in reverse direction, thereby guiding the coil on the first layer of the coil 33.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a persistent current switch used in superconducting power storage systems and the like.

<Prior Art> In a superconducting power storage system, a persistent current switch with a special coil structure is interposed between superconducting coils.

The basic configuration of this superconducting storage system is shown in FIG. In the same figure, a persistent current switch 13 is connected to a superconducting coil 12.
are connected in parallel to form a persistent current loop 14, whereby electric power is stored as magnetic field energy. The persistent current switch 1 supplies energy to this superconducting power storage system and extracts energy from the system.
3 is turned off.

In the superconducting power storage system as described above, a persistent current switch that utilizes superconductivity is used.

The structure of a persistent current switch using this superconductivity is illustrated in FIG. In Fig. 6, 15 is a coil bobbin, 1
6 is a superconducting wire (coil) wound around a coil bobbin 15
, 17 is an insulating sheet that insulates between the laminated coils, 18 is a heater provided on the coil via the insulating sheet 17 for controlling the switch on/off, and 19 is a mold (or coil holder) for fixing the coil. ingredients).

As shown in FIG. 7, the superconducting wire 16 wound around the coil bobbin 15 is constructed by embedding a large number of superconducting filaments 16b in a Cu-Ni alloy 16m. The electrical resistance of Cu is higher than that of Cu used in normal superconducting wires, and the resistance as a wire in a normal conduction state is high.

Therefore, the persistent current switch is turned off by heating the superconducting wire 16 with the heater 18 and bringing the wire into a high resistance state.
By canceling the heating of 8 and bringing the superconducting $1J16 into a superconducting state, the switch is turned off.

By the way, in the coil winding of the persistent current switch 13, the first and second layers are non-inductively wound in opposite directions to suppress inductance, to reduce the generation of magnetic field and electromagnetic force, and to prevent energy from accumulating inside. There is.

<ff problem to be solved by the invention> In the persistent current switch 13 described above, if the coil 16 has a capacity of about IKA and is small, it is necessary to apply sufficient tension even with human power when unwinding during two-layer winding. I can do it.

However, when the capacity reaches about 10KA, the coil 1
6 becomes larger, and the coil bobbin 15 also becomes larger. Therefore, when winding a coil, the coil bobbin is attached to a winding machine and the coil 16 is wound while applying tension. and,
When unwinding the end of the coil bobbin 15, the winding machine is reversed, but at this time, the tension of the coil 16 decreases, and there is a possibility that the coil winding may become loose.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a persistent current switch in which the coil does not loosen during unwinding even if the switch has a large capacity and the coil and coil bobbin are large.

<Means for Solving the Problems> To achieve the above object, the present invention provides a persistent current switch in which a coil is unwound at the end and two layers of coils are wound around a coil bobbin in opposite directions. , a first winding frame is provided at an end of the coil bobbin so as to protrude from the end of the coil bobbin, and the coil is in close contact with the circumferential surface of the coil after winding the first layer; The tip of the coil is pressed and locked against the first winding frame, and the parts of the coil that are not in close contact with the circumferential surface of the first winding frame are fixed to the circumferential surface, and the coil is brought into close contact with the coil bobbin in the opposite direction. The present invention is characterized in that a second winding frame, which is guided in the opposite direction onto the first layer of coils, is detachably attached to the end face of the coil bobbin.

<Function> When the first layer has been wound and the coil reaches the end, the coil is closely attached along the circumference of the first winding frame with the second winding frame removed, and the tension is maintained while the second winding frame is wound. Install the reel. By attaching the second winding frame, the tip of the coil at a portion that is closely surrounding the first winding frame is pressed and locked against the first winding frame. In this state, the coil is closely guided in the opposite direction along the circumferential surface of the second winding frame, and the coil is wound in the opposite direction onto the coil of the first layer of the coil bobbin.

Embodiments FIG. 1 shows a cross-sectional side view of a persistent current switch according to an embodiment of the present invention, and FIG. 2 shows a front view thereof. Also the third
FIG. 4 is a perspective view showing an end face of a persistent current switch according to an embodiment of the present invention.

The persistent current switch 31 in this embodiment has a cylindrical coil bobbin 32 and a superconducting wire (coil) 33 wound in two layers.

A large number of thin plate-like blinds 34 extending in the axial direction are attached to the cylindrical surface of the coil bobbin 32 at equal intervals (5-intervals) in the circumferential direction.
An uneven coil winding surface is formed. A flange 35 is provided at the base end of the coil bobbin 32.
5 is provided with a support 35a. Furthermore, coil support fittings 36 and 37 for holding the ends of the coil 33 are provided on the surface of the flange 35 on the coil bobbin 32 side.

A coil 33 is wound in two layers on the coil winding surface of the coil bobbin 32, and a proximal end 33a at the beginning of winding and an end 33b at the end of winding of the coil 33 are fixedly held by coil support fittings 36, 37.

A cylindrical presser tube 38 is fitted to the outer periphery of the coil 33, and the coil 33 is fixed to the coil winding surface of the coil bobbin 33 and protected by the presser tube 38.

On the other hand, on the tip surface (end surface) 32a of the coil bobbin 32,
A first winding frame 43 and a second winding frame 44 are provided to guide the coil 33 in opposite directions between the first layer and the second layer and to ensure the tension of the coil 33 when unwinding to the second layer. .

That is, a fixing plate 42 is fixed to the end surface 32a of the coil bobbin 32 by bolts 41, and a first winding frame 43 is fixed to the fixing plate 42 with the end m132a sandwiched therebetween. The first winding frame 43 protrudes from the end surface 32a and has a circumferential surface with a smaller diameter than the coil bobbin 32, so that the coil 33 after winding the first layer is in close contact with the circumferential surface (the second (arrow 1 part in the figure). Further, a disk-shaped second winding frame 44 is detachably attached to the fixing plate 42 with the end face 32a in between, and the second winding frame 44 is in close contact with the circumferential surface of the first winding frame 43. The tip of the coil 33 is pressed and locked against the first winding frame 43 at the part, and the coil 33 at the part (not in close contact with the circumferential surface of the first winding frame 43) is moved closely in the opposite direction along the circumferential surface. The coil 33 is then guided onto the first layer coil 33 of the coil bobbin 32 (as indicated by the arrow 1 in FIG. 2).

The end face 32a of the coil bobbin 32 is inclined so that even if the coil 33 has a rectangular cross section, the end face 32a can naturally move to the unwinding portion. Furthermore, when performing a functional test of the persistent current switch 31, it is necessary to place it in a cryostat (insulated container) and cool it with helium. At this time, the persistent current switch 31 is suspended from the top plate of the cryostat using the support fittings 35a. During cooling, liquid helium flows between the blinds 34 and the coil 33 can be efficiently cooled. Further, when the first layer of coil 33 is wound, the end of coil 33 does not necessarily reach the end of coil bobbin 32. In this case, when one turn remains in the first layer, the remaining radius is measured and a spacer is inserted.

A presser plate 45 is disposed on the end surface 32a of the coil bobbin 32, and the presser plate 45 is fixed to the fixed plate 42 by bolts 45. Further, a presser foot N46 is attached to the fixed plate 42 to cover the end surface 32a of the coil bobbin 32. The coil bobbin 32 is provided with a heating element 47 that generates heat when energized and raises the temperature of the coil 33.
The coil 33 is made normal conductive or superconductive (ON-OFF switch). Further, the flange 35 is provided with a wire 48 that prevents the coil 33 wound in two layers from moving due to electromagnetic force, and the coil 33 is fixed by tightening the presser cylinder 38 with the wire 48.

The operation of winding the coil 33 around the coil bobbin 32 of the $111 persistent current switch 31 will be described with reference to FIGS. 3 and 4.

The coil bobbin 32 is attached to a winding machine (not shown), the base end 33a of the coil 33 is fixed to the coil support fitting 36, and the coil 33 is wound while applying tension to the coil winding surface of the coil bobbin 32. At this time, the second winding frame 40 is removed. When the coil 33 reaches the end surface 32a of the coil bobbin 32, the coil 33 is moved to the first winding frame 4 as shown in FIG.
30. The winding machine is stopped in a state where the tension is maintained in close contact with the circumferential surface.

The second winding frame 44 is fixed, and the coil 33 that is in close contact with the circumferential surface of the first winding frame 43 is pressed against the first winding frame 43 and locked therein.

In this state, the coil 33 remains under tension.

While reversing the winding machine, as shown in FIG. Then, guide the coil onto the first layer coil 33. In this state, the coil 33 is wound in the opposite direction and unwound while applying tension again, and after being wound up to the flange 35, the terminal end 33b of the coil 33 is fixed to the coil support fitting 37. Finally, the presser cylinder 38 is fitted onto the outer periphery of the coil 33 and fixed with the wire 48, and the coil 38 of the persistent current switch 31 is
Complete wrapping.

Therefore, according to the persistent current switch 31 having the above configuration, when the winding machine is reversed after the winding of the first layer of the coil 33 is completed, the coil 33 is transferred to the first winding frame 4 by the second winding frame 44.
Since the coil 33 can be locked in place, the tension of the coil 33 does not decrease.

<Effects of the Invention> The persistent current switch of the present invention has a first winding frame protruding from the end face of the coil bobbin, a coil that is closely attached to the circumferential surface of the first winding frame, and a coil that is fixed to the first winding frame. The second winding frame is removably provided to closely guide the coil in the opposite direction, so after the first layer has been wound, the second winding frame is attached and the second winding frame locks the coil to the first winding frame. Even if the coil and coil bobbin have a large capacity and the coil and coil bobbin are large, by guiding the coil to the coil bobbin, it is possible to eliminate a decrease in the tension of the coil when the coil is unwound at the end of the coil bobbin. As a result, even if the coil is thick, loosening of the coil winding can be prevented and the reliability of the persistent current switch can be improved.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional side view of a persistent current switch according to an embodiment of the present invention, Fig. 2 is a front view thereof, Figs. 3 and 4 are perspective views thereof, and Fig. 5 is a superconducting power storage system. A block diagram showing the basic configuration, FIG. 6 is a sectional view of the persistent current switch, and FIG. 7 is a sectional view of a superconducting wire used in the persistent current switch. In the drawing, 31 is a persistent current switch, 32 is a coil bobbin, 32a is an end face, 33 is a superconducting wire (coil), 43 is a first winding frame, and 44 is a second winding frame. Figure 2 Figure 3 Figure 4 Figure 5/ Figure 6 Figure 7

Claims (1)

[Claims] In a persistent current switch in which the coil is unwound at the end and two layers of coils are wound on a coil bobbin in opposite directions, a first winding frame in which the coil after winding the first layer is brought into close contact along the circumferential surface. is provided protrudingly at the end of the coil bobbin, and the tip of the coil in a portion that is in close contact with the circumferential surface of the first winding frame is pressed and locked against the first winding frame, and the circumference of the first winding frame is A second winding frame is attached to and detached from the end face of the coil bobbin so that the coil at a portion that is not in close contact with the surface is guided in the reverse direction along the circumferential surface so as to guide the coil in the reverse direction onto the first layer coil of the coil bobbin. A persistent current switch characterized by being freely installed.