JPH01315121A - Winding of inductance component - Google Patents

Abstract

PURPOSE:To reduce a danger that an end of a winding is disconnected during and after a winding operation by a method wherein a thermoplastic resin bump which can be removed after the winding operation is attached to a flange and the end of the winding is treated. CONSTITUTION:During a winding operation, an elastic thermoplastic resin bump 15 is attached in advance to an outer periphery part of a flange 2 near a terminal 9. A winding 5 is wound on a trunk of a bobbin 1; in a state that a tensile force is exerted on an end of the winding, the end of the winding is wound on the terminal via the upper part of the thermoplastic resin bump 15. After that, the thermoplastic resin bump 15 is heated, melted and flows down; the thermoplastic resin bump 15 is removed from a part of the flange 2. Accordingly, when a tensile force exerted on the end of the winding is too large, the thermoplastic resin bump 15 acts as a shock absorber and is elastic-deformed largely; the end of the winding is intruded into the thermoplastic resin bump 15. By this setup, a danger that the end of the winding is disconnected during a winding operation and after the winding operation is reduced; reliability is enhanced.

Description

[Detailed Description of the Invention] [Summary] Regarding the improvement of the winding method for inductance parts such as coils and transformers, there is less risk of the winding terminal being disconnected during and after winding.
With the aim of providing a highly reliable method for winding inductance components, elastic thermoplastic resin bumps are attached in advance to desired locations on the flange of a bobbin, and the ends of the winding wire are wound around the body of the bobbin. Then, tension is applied to wrap the winding end around the terminal through the upper part of the thermoplastic resin bump, and then the thermoplastic resin bump is heated and removed.

[Industrial application field]

The present invention relates to improvements in winding methods for inductance components such as coils and transformers.

In recent years, electronic parts and devices have become lighter, thinner, and smaller.
At the same time, higher density was required. Against this background, inductance components such as coils and transformers mounted on printed circuit boards are required to be smaller and lighter, and at the same time, are required to have high reliability, such as no disconnection.

[Conventional technology]

A conventional inductance component is constructed as shown in a side sectional view of FIG.

In FIG. 2, reference numeral 1 denotes a bobbin made of thermosetting resin by molding, and has flanges 2 at each end of a rectangular cylindrical body, for example.

Further, one flange 2 has at least two terminals 9.
is installed vertically, and the winding 50 wound on the body, the winding start end 6 and the winding end end 7 are wound around the base of each terminal 9,
The soldering after that is even and fixed.

On the other hand, at a location near the terminal 9 on the outer periphery of the flange 2,
A cutout 3 is provided, and the winding start end 6 and winding end 7 of the winding 5 are inserted into the cutout 3 to cross the flange 2 and wound around the terminal 9.

In this way, by inserting the winding terminal into the cutout 3,
The positions of the winding start end 6 and the winding end end 6 are easily set, and the workability of the winding is improved.

In addition, the winding specifications are as follows, for example.

Bobbin body dimensions... 10110 Square winding wire diameter 5... 0.4 am Number of turns ・
...50 to 100 turns The inductance component as described above is mounted on a printed board (not shown) by inserting and soldering the tips of the terminals 9 into corresponding through holes.

At this time, an automatic winding machine is generally used for the winding work, but if the winding part wound around the body of the bobbin 1 becomes unraveled or loosens, the characteristics of the inductance component may become unstable. becomes.

Therefore, a sufficiently strong tensile force is applied to the winding end, particularly the winding end 7, in the direction shown by the chain arrow P1, and in this state, the winding end 7 is wound around the base of the terminal 9.

[Problem to be solved by the invention]

However, in the above-mentioned conventional winding method using an automatic winding machine, when the winding end is wound around the terminal, an unnecessarily strong tensile force is applied, which may cause the winding end to break.

Further, even if the winding wire is not cut during terminal processing, tensile stress remains, and as a result, there is a risk that the winding end may be cut by a slight external force thereafter.

Furthermore, due to the difference in thermal expansion coefficient between the bobbin and the winding, there was a risk that the end of the winding would break.

The present invention was created in view of the above points, and an object of the present invention is to provide a highly reliable method of winding an inductance component in which the winding terminal is less likely to be disconnected during and after winding. There is.

[Means to solve the problem]

In order to achieve the above object, the present invention, as illustrated in FIG.
An elastic thermoplastic resin bump 15 is attached in advance to the outer periphery of the holder.

Winding vA5 around the body of the bobbin 1, and applying tension to the end of the winding, the end of the winding is connected to the thermoplastic resin bump 15.
, and wrap it around the terminal 9.

After that, the thermoplastic resin bump 15 is heated, melted and poured off, and the thermoplastic resin bump 15 is removed from the flange 2 part.
remove.

[Effect]

After winding the winding 5 around the body of the bobbin 1 as described above, tension is applied to the end of the winding to form an elastic thermoplastic resin bump 1.
5, and the end of the winding is wound around the terminal 9.

Therefore, if the tensile force applied to the winding end is too large, the thermoplastic resin bump 15 acts as a buffer and is largely elastically deformed, causing the winding end to inject into the thermoplastic resin bump 15. That is, there is no fear that the end of the winding wire will be cut off during winding.

Further, the thermoplastic resin bumps 15 are heated and removed after the winding operation. Therefore, the tension applied to the terminal 9 during winding is sufficiently relaxed, and the tensile stress applied during winding does not remain at the end of the winding.

Since there is no residual stress in this way, even if the bobbin and the winding expand due to changes in environmental temperature, there is no risk of the end of the winding breaking due to the difference in their thermal expansion coefficients. Furthermore, even if an external force is applied to the winding end by hitting another object, there is no fear that the winding end will be easily cut.

〔Example〕

The present invention will be specifically described below with reference to the drawings. Note that the same reference numerals indicate the same objects throughout the figures.

1 (al, bl, and (C) are process diagrams of an embodiment of the method of the present invention, in which a bobbin 1 molded with a thermosetting resin has a rectangular cylindrical body at both ends. Each is provided with a flange 2.

Then, two terminals 9 are vertically provided on the end face of one flange 2 (lower flange in FIG. 1), and cutouts 3 are provided on the outer periphery of the flange 2 close to each terminal 9. It is.

As shown in FIG. 1 (al), before installing the bobbin 1 in the automatic winding machine, a thermoplastic resin bump 15 is suitably placed in advance in the cutout 3 near the terminal 9 where the winding end 7 is wound. Press-fit the amount of , or use adhesive to attach it.

The thermoplastic resin bump 15 is made of a thermoplastic resin that is elastic and softens and flows at a relatively low temperature, such as vinyl fluoride resin. And, longitudinal elastic modulus... 150X10" (kg
/cJ) Melting point: Around 100°C.

The volume and shape of the thermoplastic resin bump 15 are the same as that of the winding terminal 7.
When the thermoplastic resin bump 15 is pulled and bitten into the thermoplastic resin bump 15, the winding end 7 does not directly touch the corner of the notch 3, etc., and after the thermoplastic resin bump 15 is removed, the winding 5 It is desirable to have a desired volume and shape so that almost no tensile force remains in the coil and the winding terminal end 7 does not loosen significantly.

Specifically, for example, when the winding end 7 is wound around the terminal 9 through the upper part of the thermoplastic resin bump 15 by easily pulling the winding end by hand, the body of the winding 5 The length of the winding terminal from the rise to the base of the terminal 9 is 130% to 180% of the length without the thermoplastic resin bump 15.
% of the volume and shape.

Then, the bobbin 1 is attached to an automatic winding machine, and the end of the winding material, that is, the winding start end 6, is wound around one terminal 9, and the cutout 3
The winding wire is drawn into the body side of the bobbin 1 through , and the bobbin 1 is rotated to wind the winding wire 5 with a desired number of turns around the body of the bobbin 1.

When the winding is finished around the bobbin body, the terminal processing mechanism of the winding machine (not shown) pulls the winding end 7 sufficiently strongly in the direction shown by the solid arrow P as shown in Figure 1). Then, the winding end 7 is wound around the terminal 9 via the upper part of the thermoplastic resin bump 15 while applying tension.

Thereafter, as shown in FIG. 1 (C1), for example, a soldering iron-shaped heating tool is used to heat the thermoplastic resin bump 15, melt it, and pour it off, thereby removing the thermoplastic resin bump 15 from the flange 2 portion.

The method of the present invention is a wire winding method as described above, in which the thermoplastic resin bump 15 is elastic and the longitudinal elastic modulus of the winding wire 5 is warmly larger than the longitudinal elastic modulus of the thermoplastic resin bump 15.

Therefore, even if the winding terminal end 7 is pulled strongly enough by the automatic winding machine, the winding terminal end 7 bites into the thermoplastic resin bump 15, and the thermoplastic resin bump 15 acts as a buffer material. Further, the winding terminal end 7 is prevented from shining directly onto the corner of the cutout portion. That is, there is no fear that the winding terminal end 7 will be cut during the winding process.

On the other hand, after the winding operation, the thermoplastic resin bumps 15 are heated and removed. Therefore, the tension applied to the terminal 9 during winding is sufficiently relaxed, and the tensile stress applied during winding is
No residue remains on the winding terminals.

Therefore, there is no risk of the winding end breaking due to the difference in thermal expansion coefficient between the bobbin and the winding, and even if an external force is applied, such as when another object hits the winding end, the winding There is no fear that the terminal will be easily disconnected.

In the embodiment, a notch 3 is provided in the flange 2 and a thermoplastic resin bump 15 is attached to the notch 3, but the thermoplastic resin bump 15 is not provided with a notch 3 and is attached to the outer circumference of the flange 2. It goes without saying that direct attachment is fine.

Further, in the illustrated example, the thermoplastic resin bump 15 is attached only to the end of the winding. The location of this attachment is determined by the mechanism of the winding machine, and the effect may be further improved by attaching thermoplastic resin bumps not only to the end of the winding but also to the start of the winding.

〔Effect of the invention〕

As explained above, the present invention is a winding method in which a removable thermoplastic resin bump is attached to a flange after winding to perform end treatment of the winding, and the winding end is fixed at the time of winding. Also, there is a practical effect that there is less risk of wire breakage after winding.

[Brief explanation of the drawing]

(al, (bl, (C1) in FIG. 1 is a process diagram of an embodiment of the method of the present invention, and FIG. 2 is a side sectional view of a conventional example. In the figure, 1 is a bobbin, 2 is a flange, and 3 is a 5 shows the winding wire, 6 shows the winding start end, 7 shows the winding end end, 9 shows the terminal, and 15 shows the thermoplastic resin hump. Military 1 Figure

Claims (1)

[Claims] An elastic thermoplastic resin bump (15) is attached in advance to a desired location on the flange (2) of the bobbin (1), and tension is applied to the end of the winding (5) wound around the body of the bobbin (1). The winding end was wound around the terminal (9) through the upper part of the thermoplastic resin bump (15), and then the thermoplastic resin bump (15) was heated and removed. A method of winding an inductance component, characterized by: