JPH1032126A - Coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-priced coil with which the deviation and the coming- off of wire can be completely prevented. SOLUTION: In the coil which is formed into multilayer cylindrical shape by alternately winding an electric wire and a sheet-like interlayer material, a cross-sectional shape, which is in parallel with the coil axis of the interlayer material 340, is formed almost into a recessed shape. The interlayer material 340 is composed of a sheet-like interlayer material main body 341, which is cylindrically wound, and a tape 342 as a stopper which is used to prevent the coming-off of wire provided on both ends in axial direction of the interlayer material main body 341.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil used for a magnet or the like of an automatic switch, and more particularly, to a coil formed of an electric wire wound in a multilayer cylindrical shape and a sheet-like interlayer material. The present invention relates to a structure for preventing displacement and dropping of electric wires near both ends in the axial direction.

[0002]

2. Description of the Related Art FIG. 3 is a side view of a conventional magnet coil, FIG. 4 is a front view, and FIG. 5 is an enlarged sectional view of a portion A in FIG. In these figures, the coil for magnet is formed by winding a rectangular electric wire 32 in a multilayer with a cylindrical sliding tube 31 as a core, and then winding a round electric wire 33 in a required number of times per layer and in a multilayer. I have. As shown in detail in FIG. 5, between the layers of the round electric wire 33, a sheet-like interlayer material 34 is interposed for orderly winding the round electric wire 33 of the next layer, and the whole is formed in a multilayer cylindrical shape. I have.

In this magnet coil, electric wires 32,
By winding the wire 33 while applying a constant tension to the wire 33, the overall shape of the coil is maintained by the tightening force in the cylindrical axis direction held by the electric wire itself. Note that in FIG.
Is a vinyl tube, 36 is a lead wire, 37 is an exterior tape, and 38 in FIG. 4 is a cotton tape.

[0004]

In this case, a force toward the coil axis is always exerted on the electric wire, and the round electric wire 33 is badly seated. There is a possibility that the protrusions of the interlayer material 34 cannot be held by only the protruding portions, and may be shifted along the coil axis or fall off toward the coil axis. In particular, when an insulating film made of plastic is used as the interlayer material 34 from the viewpoint of cost and mechanical strength, the frictional force between the electric wire and the insulating film is small,
The above-described displacement and drop-off are more likely to occur due to the impact force during work or transportation.

In view of these points, conventionally, after the coil is manufactured, the entire coil is impregnated and cured with an insulating resin to fix and retain the electric wire. 39 in FIG.
Indicates this insulating resin.

However, according to this method, not only is the coil itself difficult to handle during the impregnation / hardening work of the insulating resin or during transportation, but also a masking treatment or a drying treatment for preventing the resin from adhering near the lead wires 36. In addition, a molding process for removing resin sagging is required, and the coil weight after resin impregnation and curing is increased, so that a large number of manufacturing steps are required for the configuration, resulting in high cost. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a coil that can surely prevent the electric wire from slipping or falling off at low cost.

[0007]

Means for Solving the Problems In order to solve the above problems, the invention according to claim 1 is directed to a coil formed in a multilayer cylindrical shape by winding an electric wire and a sheet-like interlayer material alternately layer by layer. The cross-sectional shape of the interlayer material parallel to the coil axis is substantially concave. Thereby, if the electric wire is wound around the concave portion of the interlayer material, it is possible to prevent the electric wire from shifting in the coil axis direction and falling off toward the coil axis.

The interlayer material may be a sheet-like interlayer material body wound in a cylindrical shape,
It is desirable to use a tape as a stopper for preventing the wire from falling off, which is attached to both ends in the axial direction of the interlayer material main body. Further, as described in claim 3, if the interlayer material is formed of an insulating material, the insulation performance between the wires in each layer can be kept good.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, FIG. 1 is an enlarged sectional view of this embodiment corresponding to FIG. 5, and the same components as those in FIG. 5 are denoted by the same reference numerals.

In FIG. 1, reference numeral 340 denotes a sheet-like interlayer material, which is attached to an interlayer material body 341 made of a plastic film such as polyester and both ends of the surface of the interlayer material body 341 (both ends in the coil axis direction). And a tape 342 as a stopper for preventing the wire from falling off. The interlayer material main body 341 may be made of another plastic or paper. The material of the tape 342 may be the same as or different from that of the interlayer material main body 341. The magnet coil does not particularly require insulation performance between the electric wires of each phase, but it is preferable to use an insulating material for the interlayer material main body 341 and the tape 342 in consideration of damage to the insulation coating of the electric wires.

FIG. 2 is a cross-sectional view showing only the interlayer material 340. The tape 342 has a width sufficiently shorter than the width (length in the coil axis direction) of the interlayer material body 341 and has a round shape. It has a thickness corresponding to the diameter of the electric wire 33. By attaching the tape 342 to both ends of the surface of the interlayer material main body 341, a concave portion 343 is formed in which the round electric wires 33 can be arranged and wound.

Generally, the diameter of the round electric wire 33 is at most 3 m.
m, and various types of plastic films are prepared for their width, thickness, and the like, and adhesion is extremely easy. Therefore, the concave portion 34 adapted to the diameter of the round wire 33
It is also easy to form the interlayer material 340 having 3.

Although not shown, the tape 342
And the interlayer material main body 341 may be integrally formed of the same material. In any case, the cross-sectional shape of the interlayer material 340 parallel to the coil axis is substantially concave, and the concave portion 343 has an electric wire. What is necessary is just to be able to wind and accommodate 33.

[0014] One round of the electric wire 33 is wound around the concave portion 343 of the interlayer material 340 thus formed with a constant tension, and the interlayer material 340 is wound thereon. By repeating the operation of winding the electric wire 33, a multilayer cylindrical coil formed by alternately winding the round electric wire 33 and the interlayer material 340 is formed as shown in FIG.
Here, since the thickness of the tape 342 is also about 3 mm,
There is no problem in keeping the cross-sectional shape perpendicular to the coil axis circular.

After winding the round electric wire 33 to the outermost layer,
The lead wire 36 shown in FIG. 3 is routed, the outer surface of the coil is covered with an exterior tape 37, and the entire coil is held and fixed.

According to the present embodiment, the tapes 342 at both ends of the interlayer material main body 341 function as stoppers, and the displacement of the round electric wire 33 along the coil axis and the dropping toward the coil axis are reliably prevented. For this reason, it is not necessary to impregnate and harden the insulating resin for fixing the wire and keeping the shape.

Although the present embodiment has been described by taking the magnet coil of the automatic switch as an example, the idea of the present invention is of course applicable to other various coils.

[0018]

As described above, according to the present invention, the cross-section of the interlayer material wound alternately with the electric wire is substantially concave in cross section parallel to the coil axis, so that the tape at both ends forming this concave portion And the like function as a stopper for preventing the wire from falling off, and reliably prevent the wire from being displaced or dropped near both ends of the coil shaft. At the same time, the stopper serves as a guide when winding the electric wire, so that the electric wire can be wound neatly.

In addition, the step of impregnation and hardening with the insulating resin after the coil is wound up becomes unnecessary, and the masking process, the drying process, the molding process for removing resin dripping, and the like become unnecessary, and the number of steps can be greatly reduced. As a result, it is possible to reduce the cost, shorten the manufacturing time, and reduce the weight of the coil.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part in an embodiment of the present invention.

FIG. 2 is a sectional view of an interlayer material according to the embodiment of the present invention.

FIG. 3 is a side view of a conventional magnet coil.

FIG. 4 is a front view of a conventional magnet coil.

FIG. 5 is an enlarged sectional view of a portion A in FIG. 3;

[Explanation of symbols]

 31 sliding tube 32 rectangular wire 33 round wire 35 vinyl tube 36 lead wire 37 exterior tape 38 cotton tape 340 interlayer material 341 interlayer material body 342 tape 343 recess

Claims (3)

[Claims] 1. A coil formed in a multilayer cylindrical shape by winding an electric wire and a sheet-like interlayer material alternately for each layer, wherein a cross-sectional shape parallel to a coil axis of the interlayer material is formed substantially concave. A coil. 2. The coil according to claim 1, wherein the interlayer material is a sheet-like interlayer material body wound in a cylindrical shape, and an electric wire attached to both ends in the axial direction of the interlayer material body for preventing the wire from falling off. A coil comprising a tape as a stopper. 3. The coil according to claim 1, wherein the interlayer material is formed of an insulating material.