JP4323710B2 - Leadless coil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a leadless coil in which a terminal portion of a wire forming a coil is integrated with a winding portion, and more particularly to a leadless coil that can be applied to a motor and a transformer, and particularly suitable for an oxide superconducting coil.
[0002]
[Prior art]
The leadless coil has an end portion of the wire forming the coil integrated with the winding portion, the end portion can be easily reinforced and the winding portion is not unwound from the end portion, and is handled as a coil block after winding. Therefore, the winding structure is excellent in workability such as assembly.
[0003]
FIG. 3 shows such a leadless coil 20, in which a tape-like or round wire-like wire is wound from the inner winding start end 20a to the outer layer winding end 20b, and the space between the wires is fixed with an epoxy resin or the like. It is a thing.
[0004]
In such a leadless coil, the superconducting characteristics after heat treatment tend to be reduced with respect to mechanical stress, and the reinforcement of the terminal greatly affects the characteristics of the superconducting coil. Therefore, a metallic superconducting wire such as Nb ₃ Sn This is a winding structure suitable for a coil using a coil and a coil using an oxide superconducting wire such as Bi-2212.
[0005]
In an oxide superconducting coil, it is necessary to have a high in-plane orientation in order to improve the critical current density (Jc). For this reason, a double pancake coil structure is formed using a tape-shaped oxide superconductor. Forming is done.
[0006]
FIG. 4 shows such a double pancake coil 30. A tape-shaped wire 30a is edgewise bent (bended in the tape plane) at the center and wound in opposite directions to form coils 30b and 30c. And the coil wound by the same direction as a whole is formed. Even in this case, the entire coil is fixed with an epoxy resin or the like.
[0007]
[Problems to be solved by the invention]
The above leadless coil has a winding structure excellent in workability such as assembly, but it is necessary to connect an electrode terminal for current supply or voltage detection to the coil terminal, and in particular, a tape-shaped wire is used. In the coil, this connection work is difficult, and sufficient terminal connection may not be obtained.
[0008]
That is, in the case of a coil using a tape-shaped wire, the electrode terminal is heated from the entire surface or the surface opposite to the connection surface while the tape-shaped electrode terminal and the connection surface of the coil terminal are in close contact with each other, and then fused to the coil terminal. Although the method of making it adhere | attach is employ | adopted, the solder etc. which fill up the clearance gap between connection surfaces must adhere to a connection surface beforehand, or must be supplied from a direction parallel to a connection surface. In the former case, a jig is required to bring the connection surfaces into close contact with each other at the time of fusion. Excess solder that protrudes when pressed must be removed. In the latter case, solder does not spread over the entire connection surface. However, there is a problem that a sufficient connection surface cannot be obtained.
[0009]
On the other hand, in a magnet using a tape-shaped oxide superconducting wire, a method of laminating several leadless coils wound in a double pancake shape is used. Conventionally, the coils are connected to each other by using a tape-shaped wire forming the coil and connecting each coil by extending it in the circumferential direction by edgewise bending along the outermost layer of the coil. As a countermeasure, there is a problem that it is difficult to reinforce and fix the winding terminal together with the wire.
[0010]
The present invention has been made to solve the above-described problems, and provides a terminal structure that facilitates good terminal connection and inter-coil connection and their reinforcement in a winding terminal of a leadless coil. Objective.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the leadless coil of the present invention is a pancake coil in which the end portion of the wire is integrated with the winding portion and the terminal member is provided on the outside, and the outer peripheral surface is pre-soldered. Further, a terminal member comprising a plurality of solder injection holes having a shape formed by cutting out a part of an annular body made of a low-resistance body and solder-plated on the inner peripheral surface in advance on the outer side of the terminal portion of the outer periphery of the coil. And arranging both ends of the terminal member by connecting members while placing the terminal portion of the wire inside the cut portion of the terminal member and bringing the outer peripheral surface of the coil and the inner peripheral surface of the terminal member into close contact in a heated state. In addition to fixing, the terminal portion and the terminal member are electrically and mechanically coupled by injecting and solidifying solder from the solder injection hole.
[0012]
In addition, the leadless coil of the present invention, in contrast to the double pancake coil, is a double pancake coil in which the end portion of the wire is integrated with the winding portion and the terminal member is provided on the outside, and the outer peripheral surface is preliminarily soldered. A terminal provided with a plurality of solder injection holes having a shape formed by cutting out a part of an annular body made of a low resistance body and solder-plated on the inner peripheral surface in advance on the outside of both end portions of the outer periphery of the coil Each terminal member is disposed, and each terminal member is disposed while the terminal portion of the wire is disposed inside the cut portion of the terminal member and the outer peripheral surface of each coil and the inner peripheral surface of each terminal member are in close contact with each other in a heated state. In addition to fixing both ends of each of the terminals by a connecting member, the terminal portions and the terminal members are electrically and mechanically coupled by injecting and solidifying solder from the solder injection holes. so That.
[0013]
Furthermore, when connecting a plurality of double pancake coils, the leadless coil of the present invention is pre-plated with solder plating on the outer peripheral surface of the double pancake coil in which the end portion of the wire is integrated with the winding portion. A plurality of solder injection holes and a plurality of connection screws having a shape formed by cutting out a part of an annular body, which is made of a low-resistance body and solder-plated on the inner peripheral surface in advance, on both outer ends of the outer periphery of the coil Each terminal member provided with a hole is disposed, the terminal portion of the wire is disposed inside the cut portion of the terminal member, and the outer peripheral surface of each coil and the inner peripheral surface of each terminal member are adhered in a heated state. In addition, each end portion of each terminal member is fixed by a connecting member, and solder is injected from the solder injection hole and solidified to electrically and mechanically connect the terminal portions and the terminal members. Combine A plurality of the double pancake coils are laminated, and a connecting member having a shape obtained by cutting a part of a cylindrical body made of a low resistance body is disposed outside each terminal member adjacent to each double pancake coil, Each of the terminal members adjacent to each of the double pancake coils is electrically and mechanically coupled by the connecting member by screwing a fixing screw into the connecting screw hole.
[0014]
The above invention is suitable when a tape-shaped oxide superconducting wire is used as the leadless coil wire.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
In the leadless coil of the present invention, a terminal member made of a low resistance material such as Ag or Cu is arranged outside the terminal portion on the outer periphery of the coil, and the terminal portion and the terminal member are made of a low melting point metal such as solder. Connect electrically.
[0016]
Since the terminal member has a shape obtained by cutting a part of the annular body, the terminal member can be brought into close contact with the terminal shape on the outer periphery of the coil by positioning the terminal portion on the outer periphery of the coil in the cut portion. it can.
[0017]
In order to enable connection between the terminal portion and the terminal member by the solder as described above, through holes are provided in a plurality of locations of the terminal member, and the through holes are used as solder injection holes, thereby electrically and mechanically. A good connection is obtained.
[0018]
Moreover, said cutting part can be utilized as an adjustment space | interval at the time of fixing the both ends of a terminal member with a connection member.
[0019]
Both ends of the terminal member are adjusted and fixed by the connecting member. This adjustment and fixing is performed simultaneously with the connection between the terminal portion and the terminal member by solder or the like, and the connecting member is connected to both ends of the terminal member. Glass thread etc. which fix the both ends of a terminal member using the bolt etc. which were provided can be used.
[0020]
In the case of a leadless coil having a double pancake coil structure, a terminal member obtained by excising a part of an annular body made of a low-resistance element is located outside both end portions on the outer periphery of the coil. Each terminal portion and each terminal member are electrically connected by the same method as described above, and at the same time, both end portions of each terminal member are fixed by connecting members.
[0021]
When assembling a plurality of double pancake coils by stacking them, a helicate tap is attached to a part of the through hole, and a low resistance body such as Ag or Cu is formed between adjacent terminal members. By connecting a connection member having a shape in which a portion is cut out and electrically connecting to each terminal member with a fixing screw, it is possible to mechanically connect the coils or connect the terminal member and the current lead.
[0022]
In this case, a plurality of through holes and helisert taps can be provided alternately.
[0023]
【Example】
FIG. 1 shows a terminal structure when a double pancake coil 1 of a leadless coil is laminated, and FIG. 2 shows a partially enlarged view thereof.
[0024]
A ring-shaped terminal 2 made of oxygen-free copper is attached to the outer periphery of each coil 1a, 1b constituting the double pancake coil 1, and a cut portion 3 is provided at one place of each terminal 2, Twenty-three through holes are formed in the coil radial direction, that is, the direction perpendicular to the connection surface (only a part is shown).
[0025]
A through hole 4a in the vicinity of the cut portion 3 is attached with a helicate tap, and the through hole 4a to which the helicate tap is attached is provided alternately with a simple through hole 4b.
[0026]
The distance between the cut portions 3 of the terminal 2 is adjusted by the glass thread 6 spanned between the bolts 5 a and 5 b attached to the helicate tap of the through hole 4 a in the vicinity of the cut portion 3.
[0027]
The other Helisert tap of the through hole 4a is used as a fixing screw for mechanically connecting adjacent terminals when the coils are stacked, and the other through hole 4b is used as a solder injection hole. The laminated double pancake coil 1 and the terminal 2 are electrically connected by soldering, and a tape-like connecting member 7 made of oxygen-free copper is attached to the helisert tap between adjacent terminals of the adjacent double pancake coils. The fixing screws 8 are electrically connected.
[0028]
The laminated body of the above double pancake coil 1 is formed as follows.
[0029]
First, the connecting surfaces of the outer peripheral surface of the coil 1 and the inner peripheral surface of the terminal 2 are plated with solder in advance, and the terminals 2 are attached to the outer peripheral surfaces of the coils 1a and 1b, respectively. When this terminal 2 is attached to each coil 1a, 1b, the tip 1c of the tape-shaped winding terminal forming the coil is arranged inside the cut portion 3, and the interval between the cut portions 3 is adjusted to make the winding. The inner surface of the terminal is brought into close contact with the outermost coil surface of the terminal.
[0030]
Specifically, the glass yarn 6 is entangled with the bolts 5a and 5b attached to the two adjacent through holes 4a in the vicinity of the cut portion 3 and the glass yarn 6 is cut while the terminal 2 is heated with a soldering iron. Tighten so that the interval is reduced. When the coil and the terminal are in close contact with each other, the glass yarn 6 is fastened and fixed with bolts 5a and 5b, and the coil is reinforced together with the winding terminal from the outer periphery to suppress the electromagnetic force applied in the radial direction during energization.
[0031]
Next, solder 9 is injected from the through-hole 4b that does not contain the helisert tap, and the terminal 2 is soldered to the coils 1a and 1b. Thereafter, the glass yarn 6 attached to the winding portion and the cut portion of the terminal 2 is fixed by epoxy impregnation.
[0032]
Thus, the double pancake coils 1 to which the terminals 2 are attached are stacked, and adjacent double pancake coils are adjacent to each other between adjacent terminals 2 as shown in FIGS. A tape-like connecting member 7 made of oxygen-free copper disposed over the outer periphery of the coil is electrically connected by a fixing screw 8 attached to the helisert tap.
[0033]
【The invention's effect】
As described above, in the leadless coil according to the present invention, good terminal connection to the coil and reinforcement of the winding part can be easily obtained, and connection between the coils can be performed very easily.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a terminal structure in which double pancake coils of leadless coils according to the present invention are stacked.
FIG. 2 is a partially enlarged cross-sectional view of FIG.
FIG. 3 is a front view of a conventional leadless coil.
FIG. 4 is a cross-sectional view of a conventional double pancake coil.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Double pancake coil 1a, 1b ... Coil 2 ... Terminal 3 ... Cut part 5a, 5b ... Bolt 6 ... Glass thread 7 ... Connection member 8 ... Fixed Screw 9 ... solder

Claims (4)

In the pancake coil in which the terminal portion of the wire is integrated with the winding portion and provided with a terminal member on the outside, the outer peripheral surface is preliminarily solder plated on the outer periphery of the coil outer periphery, and is made of a low resistance body. A terminal member having a plurality of solder injection holes having a shape obtained by excising a part of an annular body whose inner peripheral surface has been subjected to solder plating in advance is disposed, and the terminal portion of the wire is placed inside the excised portion of the terminal member. while arranged to brought into close contact with the inner peripheral surface of the terminal member and the coil outer circumferential surface in a heated state, it is fixed by the connecting member both ends of the terminal member, solidifying by injecting solder from the solder injection hole The leadless coil characterized by connecting the said terminal part and the said terminal member electrically and mechanically. In the double pancake coil in which the terminal part of the wire is integrated with the winding part and provided with the terminal member on the outside, the outer peripheral surface is preliminarily solder-plated on the outer side of both terminal parts on the outer periphery of the coil. A terminal member having a plurality of solder injection holes each having a shape obtained by excising part of an annular body whose inner peripheral surface has been subjected to solder plating in advance, and cutting the terminal portion of the wire member wherein respectively placed in the interior part the each coil outer peripheral surface while contact with the inner peripheral surface heating condition of each of the terminal members, is fixed by the connecting member of each end portions of the respective terminal members, from the solder injection hole A leadless coil, wherein each terminal portion and each terminal member are electrically and mechanically coupled by injecting and solidifying solder. The outer end of the double pancake coil, in which the end of the wire is integrated with the winding part, is solder plated on the outer periphery of the coil. A terminal member provided with a plurality of solder injection holes and a plurality of connecting screw holes each having a shape obtained by cutting out a part of the annular body provided with a terminal, and the terminal portion of the wire rod is disposed inside the cut portion of the terminal member. The respective outer peripheral surfaces of the coils and the inner peripheral surfaces of the terminal members are fixed in contact with each other while being fixed in contact with each other by connecting members. The terminal members adjacent to each double pancake coil are laminated by laminating a plurality of double pancake coils in which the terminal portions and the terminal members are electrically and mechanically coupled to each other. A connecting member having a shape obtained by cutting a part of a cylindrical body made of a low resistance body is disposed outside, and a fixing screw is screwed into the plurality of connecting screw holes, thereby adjacent each double pancake coil. A leadless coil, wherein each terminal member is electrically and mechanically coupled by the connecting member. The leadless coil according to any one of claims 1 to 3, wherein the wire is a tape-shaped oxide superconducting wire.

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