JPS6353683B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a coil manufacturing method and a manufacturing jig, and particularly to a coil in which each conductor of a coil wound in an aligned manner is bonded under pressure. The present invention relates to a manufacturing method and a manufacturing jig.

[Background of the invention]

First, the conventional manufacturing method of this type of coil will be explained in the first step.
This will be explained using Figure 5.

Fig. 1 is a front view showing a winding machine for winding conductors on a winding core in an aligned manner, Fig. 2 is a side view seen from the arrow direction in Fig. 1, and Fig. 3 is a conventional coil manufacturing method. FIG. 4 is a plan view of the upper jig of the coil manufacturing jig, and FIG. 5 is a plan view of the lower jig of the jig and the coil manufactured using the same. FIG. 6 is a side view showing a state in which the upper jig is placed on the coil manufacturing jig shown in FIG. FIG. 3 is a perspective view showing a coil in which conductors are bonded and solidified.

First, a method of forming a coil by winding the conductor 13 around the winding core 2 in an aligned manner will be explained using FIGS. 1 and 2.

The conductor 13 has an insulating coating wrapped with a thermosetting adhesive tape (not shown).

When the winding core 2 is attached to the rotary plate 10 rotatably attached to the winding machine main body 12 and the drive device 11 is driven, the winding core 2 rotates and the conductor 13 is gradually wound around the winding core 2. By winding a predetermined number of turns,
A coil 1 wound in an array is formed.

Next, the method for manufacturing a coil 16 in which each conductor of the coil 1 is bonded under pressure to form a coil 16 in which the wires are wound in an aligned manner and the conductors are bonded and solidified is described in the third to fifth steps.
Explain using diagrams.

The coil 1 wound by the predetermined number of turns is wound around the winding core 2.
Remove it from the rotary plate 10 while still wrapped around it.

The core 2 with the coil 1 wound thereon is inserted into the core insertion groove (not shown) of the lower plate 7. An upper push block 8 fixed to the upper plate 9 and having a core insertion groove 17 penetrating through the upper plate 9 is placed on the coil 1, and the core insertion groove 17 is inserted into the upper part of the core 2. Fit it into. At this time, the upper jig can be slid in the vertical direction using the winding core 2 as a guide.

Here, this coil manufacturing jig is set on a pressurizing device, such as a pressurizing table (not shown) of a press, and
The upper plate 9 and the lower plate 7 are pressed to apply pressure to the upper and lower surfaces of the coil 1. At the same time, the hydraulic cylinders 5 and 6 fixed to the lower plate 7
is driven into the lateral push block 3 and end push block 4 while pressing the sides and ends of the coil 1 by the side push block 3 and end push block 4 attached respectively. The coil 1 is heated by energizing a buried heater (not shown). When the temperature of the coil 1 reaches the curing temperature of the adhesive tape, the adhesive tape flows and hardens after a few minutes, bonding the conductors 13 together.
A coil 16, as shown in FIG. 6, is obtained which is wound in alignment and has conductors bonded and solidified.

However, the conventional coil manufacturing method described above has
The following problems arose.

FIG. 7 is a schematic diagram showing a state in which one turn of a certain portion of the coil is pushed in by δ due to pressurization.

In FIG. 7, the broken line shows the state before pressurization, and the solid line shows the state after pressurization. When pushed in by δ in this way, the length of this one turn is 2π(r ₀ − r)
= 2πδ shortened, and conductor 13 -2πδ/l ₀ (however
l ₀ is the circumference of one turn of the conductor). When the amount of compressive strain is large, the conductor 13 buckles and takes on a wavy shape, creating a gap between the conductors. When such a gap occurs, for example, in the case of a superconducting coil, the binding force of the conductor becomes weaker, causing the conductor to move when electromagnetic force is applied, resulting in quenching due to the generation of frictional heat due to this movement. There was also the problem that residual stress caused by the buckling caused cracks to occur after the coil was formed.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks of the prior art, and manufactures a coil that is wound in alignment and bonded and solidified between the conductors, without creating gaps or cracks between the conductors of the coil. Providing a method and manufacturing equipment directly used for its implementation,
That is the purpose.

[Summary of the invention]

The structure of the coil manufacturing method according to the present invention is such that a thermosetting resin adhesive is disposed on the insulation coating of the core, which is made up of two core pieces that can adjust the length of the coil-formed part of the core. In the method for manufacturing a coil in which the conductors are bonded and solidified from a coil formed by winding conductors in an aligned manner, the coil formed on the core metal is surrounded by a coil formed on the metal core so as not to cause compressive strain in the conductor. While increasing the length of the coil-formed part of the core in which the coil has been formed, pressure is applied in the direction of the coil winding axis and in a direction perpendicular thereto, and the adhesive is brought into a fluid state by heating to a temperature higher than the curing temperature of the adhesive. By then solidifying the coil, a coil is manufactured in which the wires are wound in alignment and the conductors are bonded and solidified.

Further, the configuration of the coil manufacturing jig according to the present invention is as follows:
A winding core consisting of two winding core pieces that can adjust the length of the coil forming part on the lower plate, a winding core drive device that can position these winding core pieces and adjust the length of the coil forming part, and the above-mentioned A hydraulic cylinder equipped with a lateral push block with a heater embedded therein for pressurizing and heating the sides of the coil wound in alignment around the winding core, and a hydraulic cylinder for pressurizing and heating the end of the coil. , a lower jig equipped with a hydraulic cylinder equipped with an end push block in which a heating heater is embedded; an upper jig equipped with an upper push block for pressurizing the upper part of the coil on the upper plate; A control device capable of controlling the winding core driving device by inputting the pushing amount of the direction pushing block or the end pushing block so that the length of the coil forming section becomes a size preset according to the pushing amount. It has the following.

[Embodiments of the invention]

The present invention will be explained below with reference to Examples.

FIG. 8 shows an example of a coil manufacturing jig (with the upper jig removed) used for carrying out the coil manufacturing method according to an embodiment of the present invention, and a coil manufactured using the same. 9 is a side view of the coil manufacturing jig shown in FIG.
Figure 0 is a front view showing the state in which the lower plate with the winding core and winding core drive device in Figure 8 attached to the winding machine is being wound, and Figure 11 is the same as Figure 10. 12 is a schematic view showing how to determine the length of the coil-formed part of the winding core and the strain state of the conductor in the embodiment shown in FIG. 8. In each figure, the same numbers indicate the same parts.

7A is a lower plate in which a core insertion groove (not shown) is bored, 14 is two core pieces 14a,
14b, the lower end of the core 14 is inserted into the core insertion groove, and the lower plate 7 is inserted so that the length L of the coil forming part can be adjusted.
It is now possible to move on A. 15 is fixed to the lower plate 7A, and by driving a motor (not shown) to rotate the threaded part 15a, the female threaded parts 14a' and 14b' are fitted into the threaded part 15a. This is a core drive device that can move the core pieces 14a, 14b closer to or away from each other. Reference numeral 3 denotes a side push block in which a heater (not shown) is embedded for pressurizing and heating the side of the coil 1 in the direction perpendicular to the coil winding axis direction. , is attached to the hydraulic cylinder 5 attached to the lower plate 7A. Reference numeral 4 denotes an end push block in which a heater (not shown) is embedded for pressurizing and heating the end of the coil 1 in the direction perpendicular to the coil winding axis direction. , is attached to the hydraulic cylinder 6 attached to the lower plate 7A.

The lower plate 7A, the winding core 14, the winding core driving device 15, the side push blocks 3, the end push blocks 4, and the hydraulic cylinders 5 and 6 constitute a lower jig 18.

The upper jig 19 has an upper pressing block 8 fixed to the upper plate 9 for pressurizing the upper part of the coil 1 in the direction of the coil winding axis.

On the other hand, in FIGS. 10 and 11, 10 is a rotary plate rotatably attached to the winding machine main body 12,
A winding core 14 and a winding core drive device 15 are attached to this rotating plate 10.
The lower plate 7A (that is, the lower jig 18 from which the hydraulic cylinders 5 and 6 and the push blocks 3 and 4 attached thereto have been removed) can be attached.

In addition, this coil manufacturing jig inputs the push amount of the side push block 3 or the end push block 4, and adjusts the coil forming length L to a preset size according to the push amount. A control device (not shown) capable of controlling the winding core drive device 15 is provided.

A method of manufacturing a coil in which the wires are wound in alignment and the conductors are bonded and solidified will be described using the coil manufacturing jig configured as described above.

First, the core drive device 15 of the lower jig 18 is driven to position the core pieces 14a and 14b so that the length L of the coil forming portion becomes a predetermined length _L0 . Once the positioning is complete, remove the hydraulic cylinders 5, 6 and the push blocks 3, 4 attached to them, and remove the lower plate 7 as shown in FIG.
Attach A to the rotating plate 10 of the winding machine. Drive device 1
1 to rotate the rotary plate 10 and wind the conductor 13 around the winding core 14. After forming the coil 1 by arranging and winding a predetermined number of turns, the rotary plate 10 is stopped, the lower plate 7A is removed from the rotary plate 10,
This is placed horizontally as shown in FIG. Let them come into contact with you.

Next, the core insertion groove of the upper jig 19 is fitted into the core 14 of the lower jig 18, and the upper jig 19 is placed on the coil 1. At this time, the upper jig 19 is slidable in the direction of the coil winding axis using the winding core 14 as a guide.

The coil manufacturing jig combined in this way is
It is set on the pressure table of a press (not shown) and a predetermined constant load is applied.

A control device (not shown) includes hydraulic cylinders 5 and 6.
oil pressure, adhesive curing completion time, and L=L ₀ +
A relational expression for πδ (details will be described later) is set and stored.
However, δ is the pushing amount of the hydraulic cylinders 5 and 6,
L ₀ is the length of the initial coil forming part, L is the pushing amount δ
This is the length of the coil forming part when .

When the control device is turned on, the heaters in the side push blocks 3 and end push blocks 4 are turned on.
Then, the hydraulic cylinders 5 and 6 press the side push block 3 and the end push block 4 with the set oil pressure to start pressurizing the coil 1. The pushing amount δ of the hydraulic cylinder 5 (= the pushing amount of the hydraulic cylinder 6) is
It is detected by a displacement meter (not shown) built into this hydraulic cylinder 5, and a signal related to this detected value is input to the control device, and the length L of the coil forming part is determined as L=
The motor (not shown) of the winding core drive device 15 is driven to widen the interval between the winding core pieces 14a and 14b so that the new coil forming part length L is calculated using the above relational expression of L ₀ +πδ. Pressurization continues.

The adhesive tape wrapped around the conductor 13 becomes fluid and then solidifies, and the conductors 13 are bonded together under pressure. When the adhesive curing completion time has elapsed, the control device is turned off and the hydraulic pressure is The oil pressure of cylinders 5 and 6 becomes 0, and the heater is also turned off.
become. Here, if the coil manufacturing jig is removed from the pressure table of the press and the upper jig 19 of this coil manufacturing jig is removed, a coil (the first coil) which is wound in the desired alignment and bonded and solidified between the conductors can be obtained. A coil (similar to the coil 16 shown in FIG. 6) is obtained.

The reason why the length L of the coil-formed part of the winding core 14 is adjusted to L=L ₀ +πδ according to the pushing amount δ of the hydraulic cylinders 5 and 6 is as follows.
This will be explained using Figure 2.

FIG. 12a is a schematic diagram showing a state in which the coil 1 is pressurized from the broken line to the solid line, causing compressive strain in the conductor 13. FIG. , is a schematic diagram showing a state in which the compressive strain of the conductor 13 at the outermost periphery of the coil is set to zero.

In FIG. 12a, the coil 1 is pushed in by δ from its initial state (before pressurization), so that
A compressive strain of ε ₀ =−2πδ/l ₀ occurs at the outermost circumference of the coil. However, l ₀ is the circumference of the outermost circumference of the coil.

Therefore, as shown in FIG. 12b and the following equation, the strain at the outermost periphery can be reduced by increasing the length L of the coil-formed part of the winding core 14 from L ₀ to L according to the pushing amount δ. It can be set to 0.

L=L ₀ + πδ Elongation strain ε _i at the innermost circumference of the coil at this time
becomes ε _i =2πδ/l _i . However, l _i is the circumference of the innermost circumference of the coil.

In this way, since the length of the coil forming part is lengthened according to the pushing amount δ, compressive strain is not generated in the conductor of the entire coil 1 as well as the conductor at the outermost periphery of the coil, and buckling of the conductor 13 is prevented. There isn't. Therefore, it is possible to manufacture a coil in which the conductors are not gapped or cracked, the wires are wound in alignment, and the conductors are bonded and solidified.

FIG. 13 shows a combination of a winding machine for forming coils wound in alignment, and a conductor formed by the winding machine, which is used to implement a coil manufacturing method according to another embodiment of the present invention. The front view shown in Fig. 14 is as follows.
FIG. 14 is a schematic diagram showing how to determine the length of the coil-formed portion of the winding core and the strain state of the conductor in the embodiment shown in FIG. 13;

In FIG. 13, parts with the same numbers as in FIG. 11 are the same parts. 20 is a tensile force loading device; 21 is an endless track that can apply a tensile force to the conductor 13 by friction with the conductor 13;
22 is a torque loading device that applies a torque that counteracts the rotation of the endless track 21.

Using a winding machine configured in this manner, the tensile force applied to the conductor 13 is 0 at the innermost circumference (winding start) of the coil 1, and the elongation strain ε ₀ of the conductor 13 at the outermost circumference is ε ₀ =πδ ₀ / The tensile force such that l ₀ (details will be explained later) is
A tensile force proportional to the number of turns of the coil 1 is applied between the innermost circumference and the outermost circumference, respectively.
The coil 1 is formed by winding the conductor 13 in an aligned manner while controlling the torque applied by the torque loading device 22 by a control device (not shown).

Next, as in the previous embodiment, using the coil manufacturing jig shown in FIG. 8, each conductor of this coil 1 is bonded under pressure, and the wires are wound in alignment. A coil is manufactured by bonding and solidifying the windings.

However, in this embodiment, when the pushing amount of the hydraulic cylinders 5 and 6 is δ, the length L of the coil-formed part of the winding core 14 is in the relationship L=L ₀ +πδ/2 (details will be described later). The motor (not shown) of the drive device 15 was driven to increase the distance between the core pieces 14a and 14b while applying pressure using the hydraulic cylinders 5 and 6.

In addition, how to determine the magnitude of the tensile force applied when winding the conductors 13 in an aligned manner, and how to determine the length of the coil-formed portion of the winding core 14 when bonding under pressure will be explained using FIG. 14. do.

FIG. 14a shows that the tensile force (0 at the innermost circumference of the coil, and the elongation strain at the outermost circumference of the coil is ε ₀ =πδ ₀ /l _{0 )} on the conductor 13.
Fig. 14b is a schematic diagram showing the strain distribution of the conductor 13 after winding while applying a tensile force of
is the conductor 13 when the coil 1 is pushed in by δ ₀
FIG. 14c is a schematic diagram showing the strain distribution of the conductor 13 when the length of the coil-formed portion of the winding core 14 is increased by πδ ₀ /2.

When winding the coil 1, the conductor 13 at the innermost circumference
When a tensile force that increases in _proportion to the _number of _turns is applied so that the strain of
It will look like figure a.

Next, when the coil 1 is pushed in by δ ₀ , the strain ε ₀ of the conductor 13 at the outermost circumference of the coil becomes ε ₀ =πδ ₀ /l ₀ −2π ₁ δ ₀ /l ₀ as shown in FIG. 14b. =−πδ ₀ /
l ₀
, the strain changes from extensional strain to compressive strain. The magnitude of this compressive strain is half of the compressive strain in the above embodiment in which no tensile force is applied during winding (where δ=δ ₀ in FIG. 12a).

Therefore, by increasing the length of the coil-formed part of the winding core 14 so as to satisfy the following formula in accordance with the pushing amount δ, when the maximum pushing amount δ is ₀ , the 14th
As shown in Figure c, the conductor 1 at the outermost circumference of the coil
3 strain can be reduced to 0.

L=L ₀ +πδ/2 Elongation strain ε _i at the innermost circumference of the coil at this time
is ε _i =πδ ₀ /l _i , and this elongation strain is equal to the elongation strain in the above example (δ in Fig. 12b).
= δ ₀ ).

According to the present embodiment described above, the magnitude of the elongation strain and compressive strain that the conductor 13 experiences during coil forming can be halved compared to the above-mentioned embodiment. This method is extremely effective when applied to coil manufacturing using conductors that have small tolerances for compressive and tensile strains.

In each of the above embodiments, a thermosetting adhesive tape is wrapped around the insulating coating of the conductor 13, but the present invention is not limited to adhesive tape, and for example, a film of thermosetting adhesive may be formed. Any adhesive may be used as long as a thermosetting resin adhesive is disposed on the insulating coating.

〔Effect of the invention〕

As described above in detail, the present invention provides a method for manufacturing a coil in which the conductors of the coil are wound in an aligned manner without gaps or cracks, and the conductors are bonded and solidified. A manufacturing jig can be provided.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a winding machine for winding conductors on a winding core in an aligned manner, Fig. 2 is a side view seen from the arrow direction in Fig. 1, and Fig. 3 is a conventional coil manufacturing method. FIG. 4 is a plan view of the upper jig of the coil manufacturing jig, and FIG. 5 is a plan view of the lower jig of the jig and the coil manufactured using the same. FIG. 6 is a side view showing a state in which the upper jig is placed on the coil manufacturing jig shown in FIG. FIG. 7 is a perspective view showing a coil in which the conductors are bonded and solidified, and FIG.
FIG. 8 shows an example of a coil manufacturing jig (with the upper jig removed) used for carrying out the coil manufacturing method according to an embodiment of the present invention, and a coil manufactured using the same. 9 is a side view of the coil manufacturing jig shown in FIG.
Figure 0 is a front view showing the state in which the lower plate with the winding core and winding core drive device in Figure 8 attached to the winding machine is being wound, and Figure 11 is the same as Figure 10. 12 is a schematic diagram showing how to determine the length of the coil-formed part of the winding core and the strain state of the conductor in the embodiment according to FIG. 8, and FIG. 13 is a diagram showing another embodiment of the present invention. FIG. 14 is a front view showing a winding machine for forming coils wound in an aligned manner and a conductor formed by the winding machine used in carrying out the coil manufacturing method according to the example. FIG. 14 is a schematic diagram showing how to determine the length of the coil-formed portion of the winding core and the strain state of the conductor in the embodiment shown in FIG. 13; 1... Coil wound in alignment, 3... Side push block, 4... End push block, 5, 6...
Hydraulic cylinder, 7A... lower plate, 8... upper push block, 9... upper plate, 13... conductor, 14... core, 14a, 14b... core piece,
15... Winding core drive device, 16... Coil wound in alignment and bonded and solidified between conductors, 18... Lower jig, 19... Upper jig, 20... Tensile force loading device, L ₀ , L... Length of coil forming part, δ ₀ , δ... Indentation amount.

Claims (1)

[Scope of Claims] 1. A conductor having a thermosetting resin adhesive disposed on an insulating coating is arranged on the core, which is made up of two core pieces that allow adjustment of the length of the coil-formed part of the core. In the method of manufacturing a coil in which the conductors are bonded and solidified from a coil formed by winding the coil into a metal core, the coil is formed around the coil formed on the core bar so as not to cause compressive strain in the conductor. While increasing the length of the coil-formed part of the core, pressure is applied in the direction of the coil winding axis and in a direction perpendicular to this, and the adhesive is heated to a temperature higher than the curing temperature of the adhesive to make it fluid and then solidified. A coil manufacturing method characterized in that a coil is manufactured by winding wires in alignment and bonding and solidifying conductors. 2. Manufacturing a coil in which the conductors are wound in an aligned manner and the conductors are bonded and solidified using a coil formed by winding the conductor in an aligned manner around a winding core while applying a tensile force that increases as the number of turns increases to the conductor. A coil manufacturing method according to claim 1, wherein the coil manufacturing method is adapted to perform the following steps. 3. A winding core consisting of two winding core pieces that can adjust the length of the coil forming part on the lower plate, and a winding core drive device that can position these winding core pieces and adjust the length of the coil forming part, A hydraulic cylinder equipped with a lateral push block with a heater embedded therein for pressurizing and heating the sides of the coil wound in alignment around the core; and a hydraulic cylinder for pressurizing and heating the end of the coil. a lower jig equipped with a hydraulic cylinder equipped with an end push block with a heater embedded therein, an upper jig equipped with an upper push block attached to the upper plate for pressurizing the upper part of the coil; A control capable of controlling the winding core driving device by inputting the pushing amount of the side pushing block or the end pushing block so that the length of the coil forming section becomes a size preset according to the pushing amount. A coil manufacturing jig characterized by having a device.