JPH09320884A - Method for connecting lead tap of foil wound coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a generation of void, when a foil wound coil is connected to a lead tap. SOLUTION: A pellet-like solder 2 is placed in a part of a foil-wound coil 1, a lead tap 5 provided with a hole 5a is placed in a portion which comes into contact with this solder, and it is interposed between carbon electrodes 8, 9 from both sides of the foil wound coil 1 and the lead tap 5, and the carbon is pressed and also heated by being electrically connected from an electrode device, so that solder is melted and the foil wound coil 1 is jointed to the lead tap 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting a lead tap of a transformer having a copper foil as a coil.

[0002]

2. Description of the Related Art Conventionally, in this type of transformer having a wide copper foil as a coil, there is a transformer shown in FIG. 3 in which a lead tap is connected to the coil. That is, the pellet-shaped solder is placed on the end portion 1a of the foil-wound coil 1, and the lead-out tap 21 is further placed on this solder, and heating is performed for soldering. Then, the foil winding coil to which the lead-out tap is connected is wound around the core to form the coil. After this, the lead-out tap is soldered to the foil-wound coil at the end of winding in the same manner as described above.

[0003]

However, when the solder is heated, the air between the flux in the solder or the foil winding coil 1 and the pellet-shaped solder, or the air between the pellet-shaped solder and the lead-out tap. May remain in the solder layer, and a large void may be generated in which the foil winding coil 1 and the lead-out tap 21 are not bonded by the solder layer. Due to the voids, the foil winding coil 1 and the lead-out tap 21 may be abnormally heated and damaged during use.

[0004]

In order to solve the above-mentioned problems, the method of connecting the lead-out tap of the foil-wound coil according to claim 1 of the present invention is such that pellet-shaped solder is placed on a part of the foil-wound coil. Then, the lead-out tap is placed on a portion that comes into contact with the solder, the solder is heated and melted, and the lead-out tap connection method of the foil-wound coil for joining the foil-wound coil and the lead-out tap is used. And at least one of the lead-out taps is provided with a hole in a portion that comes into contact with the solder, and is sandwiched by carbon electrodes from both sides of the foil-wound coil and the lead-out tap, pressurizes the carbon electrode, and energizes from a power supply And let it heat,
The lead tap of the foil winding coil is joined by melting the solder and joining the foil winding coil and the lead tap.

The connection between the foil-wound coil and the lead-out tap can be confirmed from the lead-out tap or the hole of the foil-wound coil for connecting with the solder, and the quality of the solder joint can be determined.

Further, the invention of claim 2 is a carbon electrode, wherein at least one of the carbon electrodes has a slit facing the hole and extending to the end.

By pressurizing the carbon electrode, gas and air when the solder is melted are discharged from the slit to the end of the electrode.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for connecting a lead tap of a foil winding coil according to the present invention will be described with reference to FIG. The pellet-shaped solder is placed on the end portion 1a of the foil winding coil 1 having a wide width, and the tapping tap 5 is placed on the solder.
Is placed. The lead-out tap 5 is provided with holes 5a at the portions which come into contact with the solder.

The foil winding coil 1 and the lead-out tap 5 are sandwiched by carbon electrodes 8 and 9 from both sides. Of the carbon electrodes, the carbon electrode 9 that comes into contact with the tap 5
Is provided with a slit 9a facing the hole 5a of the lead-out tap 5 and extending to the end of the electrode. Then, the carbon electrodes 8 and 9 are pressed, and the electrodes 8 and 9 are heated by being energized from a power supply device 11 (not shown) to melt the pellet-shaped solder 2 and to expose the foil winding coil 1 and the lead-out coil 1 as shown in FIG. The tap 5 is joined by the solder layer 3.

When the pellet-shaped solder 2 is melted, the gas and air due to the flux are discharged from the slit 9a through the hole 5a by the pressurization of the carbon electrodes 8 and 9.

As shown in FIG. 2, the foil-wound coil having the lead-out tap formed as described above shows a state in which the foil-wound coil 1 and the lead-out tap 5 are joined together, and particularly, the wet state between the lead-out tap 5 and the solder layer 3 is shown. It can be confirmed from the hole 5a, and defective solder joint can be determined.

In the embodiment of FIG. 1 described above, two holes 5a are provided in the tap, but one hole may be provided, and three holes 5a may be provided.
The number may be more than one. Further, although the slits are provided on the carbon electrode 9, the carbon electrodes 8 and 9 may be replaced with each other due to work, and therefore the slit 8 is also formed on the carbon electrode 8.
a may be provided. In the above embodiment, the taps are provided at the beginning and end of winding the coil,
It can also be provided as an intermediate tap. Further, although the tap 5 is provided with the hole 5a, the hole 5a may be provided in the foil winding coil.

[0013]

According to the first aspect of the present invention, since a hole is provided in a portion of the lead-out tap or the foil winding coil that comes into contact with the solder, the joint between the foil-winding coil and the lead-out tap can be confirmed from the hole. It is possible to judge the quality of solder joint.

In the invention of claim 2, since the carbon electrode is provided with the slit so as to face the hole,
Gas and air at the time of melting the solder are discharged from the slits to the end portions of the electrodes by pressurization of the carbon electrodes, so that good soldering without voids can be performed.

[Brief description of drawings]

FIG. 1 is an exploded view illustrating an embodiment of a method for connecting a lead-out tap of a foil winding coil according to the present invention.

FIG. 2 is a cross-sectional view of a foil-wound coil having a lead-out tap formed by the method for connecting the lead-out taps of the foil-wound coil according to the present invention.

FIG. 3 is a perspective view of a foil winding coil having a lead-out tap formed by a conventional method for connecting a lead-out tap of a foil-wrapping coil.

[Explanation of symbols]

 1 (Wide width) Foil material coil 2 (Pellets) Solder 3 Solder layer 5 Output tap 5a Hole 8,9 Electrode 8a, 9a Slit 11 Power supply device 21 Output tap

Claims (2)

[Claims] 1. A foil-wound coil having a pellet-shaped solder placed on it, and a soldering tap placed on a portion in contact with the solder to heat and melt the solder, and the foil-wound coil and the soldering tap. In the connection method of the lead tap of the foil winding coil to join with, at least one of the foil winding coil and the lead tap is provided with a hole in the portion in contact with the solder, the foil winding coil and the lead tap of It is sandwiched by carbon electrodes from both sides, the carbon electrodes are pressed, and a power supply is energized to heat them.
A method of connecting a lead tap of a foil winding coil, characterized in that the solder is melted and the foil winding coil and the lead tap are joined together. 2. The method for connecting a lead-out tap of a foil-wound coil according to claim 1, wherein at least one of the carbon electrodes is a carbon electrode facing the hole and having a slit extending to an end thereof.