JP2009016622A - Superconducting coil unit and superconducting equipment with the superconducting coil unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To securely prevent pancake coils from rotating by a mechanical structure in a superconducting coil unit having a plurality of pancake coils stacked. <P>SOLUTION: A superconducting coil unit is constituted by stacking and fixing the plurality of pancake coils formed by winding superconductors around spools axially in order onto a center connecting core material. While a groove or projection is provided which extends axially on an outer peripheral surface of the center connecting core material, a groove in which the projection is to be fitted or a projection to be fitted in the groove is provided on an inner peripheral surface of each spool. The groove provided to the center connecting core material or spool has a longer peripheral length than that of the projection. The projection is made to abut against one peripheral end side of the groove and a fixation key is inserted into a gap formed on the other side to fix each spool to the center connecting core material, and the adjacent pancake coils are made different in fixing key insertion position to make a peripheral position shift in winding end position as a lead wire connection part of each pancake coil. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a superconducting coil unit and a superconducting device provided with the superconducting coil unit, and more specifically, in a superconducting coil unit in which pancake coils composed of a plurality of superconducting coils are stacked, each pancake coil is prevented from rotating. Is.

Conventionally, there has been provided a superconducting coil unit in which a plurality of pancake coils made of a double pancake shape or a single pancake shape superconducting coil are laminated in the axial direction.
As this type of superconducting coil unit, the present applicant provides a superconducting coil unit 1 shown in FIG. 8 in Japanese Patent Laid-Open No. 6-151168 (Patent Document 1). In the superconducting coil unit 1, pancake coils 2 made up of a plurality of superconducting coils are laminated in the axial direction, and the adjacent pancake coils 2 are bonded and fixed together via a glass fiber reinforced sheet 3.

JP-A-6-151168

  In the superconducting coil unit 1 provided in Patent Document 1, each pancake coil 2 is simply fixed by adhesion via a glass fiber reinforced sheet 3. There is a possibility that a large load is applied to the pancake coil 2, the adhesive force is loosened, and the pancake coil 2 rotates. When the pancake coil 2 rotates, there is room for improvement in that there is a possibility that the terminals for connecting lead wires of the adjacent pancake coils 2 come into contact with each other and the adjacent pancake coils 2 may become conductive.

  The present invention has been made in view of the above problems, and in a superconducting coil unit in which pancake coils composed of a plurality of superconducting coils are stacked, the pancake coil is not mechanically bonded and fixed, but has a mechanical structure. The problem is to ensure that rotation is impossible.

In order to solve the above-described problems, the present invention provides a superconducting coil in which a plurality of pancake coils each formed by winding a superconducting wire around a winding frame are sequentially externally fitted to the central connecting core member in the axial direction and stacked and fixed. A unit,
Providing protrusions or grooves extending in the axial direction on the outer peripheral surface of the central connecting core member, while providing grooves that fit the protrusions or protrusions that fit into the grooves on the inner peripheral surface of each winding frame,
The circumferential length of the groove provided in the central connecting core or the winding frame is larger than the circumferential length of the projection, and the projection is brought into contact with one end side in the circumferential direction of the groove, and the other Insert a fixed key into the gap generated on the side to fix each reel to the center connecting core,
Provided is a superconducting coil unit in which the insertion position of the fixed key is made different between adjacent pancake coils, and the winding end position that becomes the lead wire connecting portion of the pancake coil is shifted in the circumferential direction. is doing.

In the superconducting coil unit of the present invention, a protrusion or groove is provided on the outer peripheral surface of the central connecting core member, while a groove or protrusion is provided on the inner peripheral surface of the winding frame, and the protrusion is inserted into the groove. Since the fixed key is inserted into the circumferential gap formed between the protrusions, the pancake coil formed by winding the superconducting wire around the winding frame can be made unrotatable. Thus, the superconducting coil unit of the present invention does not prevent the pancake coil from rotating by an adhesive force such as an adhesive, but prevents the pancake coil from rotating by a mechanical structure. The pancake coil can be prevented from rotating even if a large load is applied to the pancake coil during operation of the superconducting coil unit.
As a result, even when the lead wire connection terminals are connected to the winding end position of the pancake coil, each pancake coil rotates and the lead wire connection terminals provided on the adjacent pancake coils are connected to each other. It is possible to prevent contact between the terminal and the terminal of the lead wire terminal connected to the other terminal.
In addition, since the pancake coils are not bonded to each other, when it becomes necessary to replace the pancake coils due to damage or the like, only the necessary pancake coils need be replaced, and the other pancake coils are replaced. There is no need.

Furthermore, between adjacent pancake coils, the winding end position of the pancake coil is shifted in the circumferential direction, so if the terminals are attached in advance to the winding end position, contact between the terminals This can be surely prevented, and the terminal of the adjacent pancake coil does not get in the way when connecting the terminal of the lead wire terminal to these terminals, and the terminal connection work can be facilitated.
In addition, when each pancake coil is externally fitted and fixed to the central connecting core member without attaching the terminal to the winding end position of the pancake coil, the terminal is soldered to the winding end position shifted in the circumferential direction. It can be easily attached by attaching.

The central connecting core is cylindrical, and the protrusion extends in the axial direction at one place on the outer peripheral surface, while the inner peripheral surface opens in the cylindrical winding frame of each pancake coil. It is preferable that one groove is provided and the fixed key is driven into the gap.
The fixed key is a flat plate made of fiber reinforced resin (FRP), and is driven by bending in a circular arc along the gap.

Each of the pancake coils is a double pancake coil that is continuous at the transition of the innermost turn of the superconducting wire, and the double-sided winding end position located on the outer peripheral surface of each double pancake coil is arranged around the key fixing position. It is preferable to provide it at a symmetrical position in the direction.
According to the above configuration, since the winding end positions at both ends are provided symmetrically with respect to the key fixing position, even if the pancake coil is attached to the central connecting core member in the axial direction opposite to the predetermined direction, the windings at both ends are wound. The end position can be arranged at a predetermined position.

The circumferential length of the projection is preferably in the range of 5 to 15 degrees with the axis as a fulcrum, while the circumferential length of the groove is preferably 1.5 to 2.5 times that of the projection.
If the winding end position of the adjacent pancake coil is at a position that is greatly separated in the circumferential direction, it is difficult to reversely attach the terminal to the winding end position or connect the lead wire side terminal to the terminal, According to the said structure, since the winding terminal position of an adjacent pancake coil is displaced and arrange | positioned in the circumferential direction in a moderate range, the said operation | work can be performed efficiently.

In the method of manufacturing the superconducting coil unit, one pancake coil is externally fitted to the central connecting core member, and a protrusion provided on either the central connecting core member or the winding frame is provided on the other side. The fixed key is inserted into a gap formed on the other side in the circumferential direction so as to approach one side in the circumferential direction. This coil outer fitting operation and fixed key insertion operation are repeated for each pancake coil.
In addition, the connection of the terminal of the lead wire terminal to the terminal provided in each pancake coil is performed after all the pancake coils are externally fitted to the central connecting core.

The present invention also provides a superconducting device provided with the superconducting coil unit.
Examples of the superconducting device include a motor, a generator, a transformer, a superconducting power storage device (SMES), and a current limiting device.

As described above, according to the present invention, a protrusion or groove is provided on the outer peripheral surface of the central connecting core member, while a groove or protrusion is provided on the inner peripheral surface of the winding frame, and the circumferential direction generated between the groove and the protrusion. Since the fixing key is inserted and fixed in the gap, the pancake coil formed by winding the superconducting wire around the winding frame can be made non-rotatable. Thus, the superconducting coil unit of the present invention does not prevent the pancake coil from rotating by an adhesive force such as an adhesive, but prevents the pancake coil from rotating by a mechanical structure. The pancake coil can be prevented from rotating even if a large load is applied to the pancake coil during operation of the superconducting coil unit.
Thereby, it can prevent that each pancake coil rotates and the terminal for lead wire connection provided in the adjacent pancake coil contacts.

Embodiments of the present invention will be described with reference to the drawings.
1 to 6 show a first embodiment of the present invention.
The superconducting coil unit 10 of this embodiment is used for a superconducting motor that is a superconducting device. As shown in FIG. 3, a plurality of pancake coils 20 having a shape of a double pancake coil formed by winding a superconducting wire. Is externally fitted to the central connecting core member 30 and laminated and fixed in the axial direction. In this embodiment, 14 pancake coils 20 are stacked.

  The central connecting core member 30 is made of fiber reinforced resin (FRP), has a long cylindrical shape in the axial direction, and has a position spaced from the upper end at one location on the outer peripheral surface as shown in FIG. Protrusions 30a extending in the axial direction from the bottom to the bottom are provided. As shown in FIG. 5B, the protrusion 30a has a uniform width provided in a range of 10 degrees in the circumferential direction with the axis O of the central connecting core 30 as a fulcrum.

  On the other hand, the winding frame 22 around which the superconducting wire 21 is wound is made of FRP, has a short cylindrical shape in the axial direction, and has an inner diameter that is substantially the same as the outer diameter of the central connecting core 30. As shown in FIG. 6, the inner circumferential surface of the winding frame 22 is provided with one groove 22a extending from the upper end to the lower end in the axial direction and having an inner circumferential surface opened. A uniform width is provided in a range of 20 degrees in the circumferential direction with the 22 axis O as a fulcrum. That is, the circumferential width of the groove 22a of the winding frame 22 is wider than the circumferential width of the protrusion 30a of the central coupling core member 30. In this embodiment, the width of the groove 22a is twice the width of the protrusion 30a. It is said.

As shown in FIG. 4, a 4 mm wide strip-shaped bismuth superconducting wire 21 and an insulating tape (not shown) are wound around the winding frame 22 to form a pancake coil 20 made of a superconducting coil. ing. The pancake coil 20 is a double pancake coil in which a first coil portion 20a and a second coil portion 20b are connected by a superconducting wire 21 at a crossing portion (not shown) extending obliquely in the innermost turn. Further, an insulating sheet (not shown) made of FRP and having a thickness of 0.2 mm is disposed between the first and second coil portions 20a and 20b and on both end surfaces in the coil axial direction.
In addition, a lead wire connecting terminal 23 is provided at the winding end position 21a of the superconducting wire 21 constituting the outermost turns of the first and second coil portions 20a and 20b. The mounting positions of these two terminals 23 (that is, the winding end position 21a) are symmetrical with respect to the groove 22a of the winding frame 22 serving as the key fixing position, and the mounting of the terminals 23 is performed by all pancake coils 20. The position is the same. In the present embodiment, the mounting position of the terminal 23 is set to a position spaced 60 degrees in the circumferential direction from the center in the width direction of the groove 22a.
The terminal 23 includes an arc-shaped conductor connecting portion 23a attached to the superconducting wire 21 and a terminal connecting portion 23b bent in a direction orthogonal to the conductor connecting portion 23a. The conductor connecting portion 23a is connected to the superconducting wire 21. The winding end position 21a is connected by soldering. The terminal connection portion 23b of the terminal 23 is provided with a through hole 23c for inserting a bolt, and a terminal (not shown) of a lead wire terminal is bolted to the terminal connection portion 23b.

As shown in FIG. 3, the lower flange 11 is externally fitted to the lower end portion of the center connecting core member 30, and the stepped portion 11 b provided on the inner peripheral surface of the through hole 11 a of the disk-like lower flange 11 is provided. The lower end surface 30b of the center connecting core member 30 is abutted and positioned.
The pancake coil 20 is placed and stacked on the lower flange 11 in a state of being fitted around the central connecting core 30. The protrusion 30a of the central connecting core 30 is arranged so as to approach one side in the circumferential direction of the groove 22a provided on the winding frame 22 of the pancake coil 20, and the fixed key 40 is placed in the gap S in the groove 22a where the protrusion 30a is not arranged. And the pancake coil 20 is positioned so as not to rotate.
The fixed key 40 is made of a rectangular flat plate of FRP and has a width in the width direction that is substantially the same width as the protrusion 30a of the central connecting core 30 (corresponding to a length of 10 degrees in the circumferential direction). When driving into the gap S generated between the protrusion 30a, the arc is bent in accordance with the shape of the gap S.

Specifically, in the lowermost pancake coil 20A, as shown in FIG. 1A, the protrusion 30a of the central connecting core member 30 is disposed on one side of the groove 22a of the winding frame 22, and one of the grooves 22a is arranged. The side surface 22a-1 is brought into contact with one side surface 30a-1 of the protrusion 30a. At this time, a gap S1 is formed between the other side surface 22a-2 of the groove 22a and the other side surface 30a-2 of the protrusion 30a, and the fixed key 40 is driven into the gap S1.
On the other hand, in the pancake coil 20B adjacent to the lowermost pancake coil 20A, as shown in FIG. 1 (B), the protrusion 30a of the central connecting core member 30 is arranged on the other side of the groove 22a of the winding frame 22. The other side surface 22a-2 of the groove 22a is brought into contact with the other side surface 30a-2 of the protrusion 30a. At this time, a gap S2 is formed between one side surface 22a-1 of the groove 22a and one side surface 30a-1 of the protrusion 30a, and the fixed key 40 is driven into the gap S2.
The pancake coil 20 disposed in the same manner as the pancake coil 20A and the pancake coil 20 disposed in the same manner as the pancake coil 20B are alternately stacked so that adjacent pancake coils do not have the same arrangement. I have to.
In FIG. 1, a terminal 23 indicated by a broken line indicates an arrangement position of the terminal 23 of the adjacent pancake coil 20, and indicates that the terminal 23 is displaced in the circumferential direction in the adjacent pancake coil. Yes.

  An upper flange 12 is externally fitted to the upper end position of the central connecting core 30, and the upper flange 12 is placed on the uppermost pancake coil 20. The upper flange 12 is fastened and fixed to the lower flange 11 with bolts B and nuts N, and the pancake coil 20 is positioned and fixed in the axial direction.

Next, a method for manufacturing the superconducting coil unit 10 will be described.
First, the lower flange 11 is externally fitted to the lower end of the center connecting core member 30.
Next, the groove 22a provided in the winding frame 22 of the pancake coil 20 is aligned with the protrusion 30a of the central connecting core member 30, and the winding frame 22 is externally fitted to the central connecting core member 30, and is placed on one side of the groove 22a. The pancake coil 20 is rotated so that the protrusion 30a is disposed, and the fixed key 40 is inserted into the gap S1 formed on the other side of the groove 22a. Thereby, the pancake coil 20 is externally fitted and fixed to the central connecting core member 30 in a state in which the pancake coil 20 cannot be rotated in the circumferential direction.
Next, similarly, the groove 22a provided in the winding frame 22 of the pancake coil 20 is aligned with the protrusion 30a of the central coupling core member 30, and the winding frame 22 is externally fitted to the central coupling core member 30. The pancake coil 20 is rotated in the reverse direction so that the protrusion 30a is disposed on the other side of the groove 22a, and the fixed key 40 is inserted into the gap S2 formed on one side of the groove 22a.
The mounting operation of the pancake coil 20 to the central connection core member 30 is repeated, and after the required number (14 in this embodiment) of pancake coils 20 are externally fitted to the central connection core member 30, the central connection core member 30 is attached. The upper flange 12 is externally fitted to the upper end of the lower flange 11 and the lower flange 11 and the upper flange 12 are fastened and fixed with bolts B and nuts N.
After the superconducting coil unit 10 is formed in this way, the terminal of the lead wire terminal is connected to the terminal 23 of the pancake coil 20.

According to the above configuration, the protrusion 30a of the central connecting core member 30 is inserted into the groove 22a of the winding frame 22, and the fixing key 40 is inserted into the circumferential gap S generated between the groove 22a and the protrusion 30a. Therefore, the pancake coil 20 can be made unrotatable. Thus, the superconducting coil unit 10 of this embodiment does not prevent the pancake coil 20 from rotating by an adhesive force such as an adhesive, but prevents the pancake coil 20 from rotating by a mechanical structure. Therefore, the holding force does not decrease, and the pancake coil 20 can be prevented from rotating even when a large load is applied to the pancake coil 20 during operation of the superconducting coil unit 10.
Thereby, it can prevent that each pancake coil 20 rotates and the terminal 23 for lead wire connection provided in the adjacent pancake coil 20 contacts.
Further, since the pancake coils 20 are not bonded to each other, when the pancake coil 20 is damaged and needs to be replaced, only the required pancake coil 20 needs to be removed and replaced. There is no need to replace the cake coil 20.

Furthermore, in the adjacent pancake coil 20, the terminals 23 are arranged so as to be displaced in the circumferential direction, so that contact between the terminals 23 can be reliably prevented and the terminals of the lead wire terminals are connected to these terminals 23. At this time, the terminal 23 of the adjacent pancake coil 20 does not get in the way, and the terminal connection work can be facilitated.
In this embodiment, no gap is provided between the first coil portion 20a and the second coil portion 20b of the pancake coil 20, but a spacer is interposed between the first and second coil portions 20a and 20b. The cooling efficiency may be improved. Further, a spacer may be interposed between adjacent pancake coils 20.

FIG. 7 shows a second embodiment of the present invention.
In the present embodiment, the groove 30c extending in the axial direction is provided on the outer peripheral surface of the center connecting core member 30, while the protrusion 22b extending in the axial direction is provided on the inner peripheral surface of the winding frame 22 of the pancake coil 20. Yes. The groove 30c of the central connecting core 30 is provided in the range of 20 degrees in the circumferential direction with the axis as a fulcrum, while the protrusion 22b of the winding frame 22 is provided in the range of 10 degrees in the circumferential direction with the axis as a fulcrum. It is wider than the protrusion 22b.

Also in the present embodiment, adjacent pancake coils 20 are arranged so as to be displaced in the circumferential direction as in the first embodiment.
Specifically, in the pancake coil 20A, as shown in FIG. 7A, the protrusion 22b of the winding frame 22 is disposed on one side of the groove 30c of the central connecting core member 30, and one side surface 22b- 1 is brought into contact with one side surface 30c-1 of the groove 30c. At this time, a gap S1 is formed between the other side face 30c-2 of the groove 30c and the other side face 22b-2 of the protrusion 22b, and the fixing key 40 is inserted into the gap S1.
On the other hand, in the pancake coil 20B adjacent to the pancake coil 20A, as shown in FIG. 7B, the protrusion 22b of the winding frame 22 is disposed on the other side of the groove 30c of the central connecting core member 30, and the protrusion 22b. The other side surface 22b-2 is in contact with the other side surface 30c-2 of the groove 30c. At this time, a gap S2 is formed between one side surface 30c-1 of the groove 30c and one side surface 22b-1 of the protrusion 22b, and the fixing key 40 is inserted into the gap S2.
The pancake coils 20A and the pancake coils 20B are alternately stacked so that adjacent pancake coils are not arranged in the same manner.

Also by the above configuration. The rotation of each pancake coil 20 can be prevented, the contact between the terminals 23 can be prevented, and the terminals 23 of the adjacent pancake coils 20A and 20B are displaced in the circumferential direction, thereby facilitating terminal connection work. be able to.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The above-described embodiments are exemplifications in all points, and are not limited to these embodiments. The scope of the present invention is indicated by the scope of claims, and all modifications within the scope equivalent to the scope of claims are made. Is included.

  The superconducting coil unit of the present invention is used for a superconducting device such as a driving motor for automobiles, other generators, transformers, superconducting power storage devices (SMES), and the like.

(A) (B) is a top view which shows 1st Embodiment of this invention and shows the state which externally fitted the pancake coil to the center connection core material. It is the schematic which shows the positional relationship of a winding frame and each pancake coil. It is sectional drawing of a superconducting coil unit. A pancake coil is shown, (A) is a perspective view, (B) is a top view. A center connection core material is shown, (A) is a perspective view and (B) is a top view. The reel is shown, (A) is a perspective view, (B) is a plan view. (A) (B) is a top view which shows 2nd Embodiment of this invention and shows the state which fitted the pancake coil to the center connection core material. It is drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Superconducting coil unit 20 Pancake coil 21 Superconducting wire 21a Winding end position 22 Winding frame 22a Groove 23 Terminal 30 Center connection core material 30a Protrusion 40 Fixed key S Gap

Claims (5)

A superconducting coil unit in which a plurality of pancake coils each formed by winding a superconducting wire around a winding frame, are sequentially fitted in the axial direction with respect to the central connecting core member, and are laminated and fixed.
Providing protrusions or grooves extending in the axial direction on the outer peripheral surface of the central connecting core member, while providing grooves that fit the protrusions or protrusions that fit into the grooves on the inner peripheral surface of each winding frame,
The circumferential length of the groove provided in the central connecting core or the winding frame is larger than the circumferential length of the projection, and the projection is brought into contact with one end side in the circumferential direction of the groove, and the other Insert a fixed key into the gap generated on the side to fix each reel to the center connecting core,
A superconducting coil unit, wherein the insertion position of the fixed key is made different between adjacent pancake coils, and the winding end position that becomes the lead wire connecting portion of the pancake coil is shifted in the circumferential direction.   The central connecting core is cylindrical, and the protrusion extends in the axial direction at one place on the outer peripheral surface, while the inner peripheral surface opens in the cylindrical winding frame of each pancake coil. The superconducting coil unit according to claim 1, wherein one groove is provided and the fixed key is driven into the gap.   Each pancake coil consists of a double pancake coil that continues at the transition of the innermost turn of the superconducting wire, and the double-sided winding end position located on the outer peripheral surface of each double pancake coil is surrounded by the key fixing position. The superconducting coil unit according to claim 1 or 2, which is provided at a symmetrical position in the direction.   The circumferential length of the projection is in the range of 5 to 15 degrees with the axis as a fulcrum, and the circumferential length of the groove is 1.5 to 2.5 times that of the projection. 2. The superconducting coil unit according to 2.   A superconducting device comprising the superconducting coil unit according to any one of claims 1 to 4.

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