JP2007049105A - Tie-up process of thin enamel wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tie-up method that prevents breakage of thin copper wire due to solder erosion. <P>SOLUTION: A coil is made by winding solderable thin enameled wire without the need to remove its coating. When the end of the enamel wire is tied up with a terminal 4, the portion from which to start tie-up is tied up densely and the portion at which to stop tie-up is tied up sparsely, and the sparsely tied up portion is soldered. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to the manufacture of coils, and more particularly to a method for connecting thin wires to terminals.

  Conventionally, as shown in FIG. 5, the connection with the terminal of the coil using a thin wire has been performed by folding the end portion of the wire so that they are close to each other and entangled with the terminal. By bringing the wires close to each other, the copper wire itself is prevented from being broken by being thinned after soldering. The phenomenon of copper becoming thinner after soldering is also called solder erosion, and is often applied to coils using enameled wires with diameters of around 0.1 mm or less.

  The tangling method using the close line is effective as a means for preventing disconnection due to the solder bite, but the close-up process leads to an increase in cost. Further, in the case of a wire having a diameter of 0.06 mm or less, even if three wires are brought close to each other, the cross-sectional area is not different from a wire having a diameter of 0.1 mm, so it is not certain whether disconnection due to solder erosion can be prevented.

  When enameled wire is wound on a bobbin after winding it on a terminal with a single wire, it is most likely to break at the end of the winding from the base of the terminal toward the bobbin. The reason is that when tension is applied to the straight portion, there is no friction on the enameled wire and the tension is applied as it is. If there is solder erosion, the line will be thin and it will be easier to cut.

  An object of the present invention is to provide a method of preventing disconnection due to solder erosion, although it is not a tangling method based on a tangential line but a crowing method that is very commonly used.

  In order to achieve the above object, the invention according to claim 1 is characterized in that a bobbin, an enameled wire that can be soldered without removing a film wound around the bobbin, and both ends of the enameled wire are tangled. In a coil consisting of terminals fixed to a bobbin that can be soldered, the part where the curl begins to be wound around the terminal of the enamel wire is densely wound, the part near the end of the curl is loosely wound, and the coil is loosely wound The part was soldered.

  According to the second aspect of the present invention, a jig made of a metal plate having a thickness corresponding to the width of the portion where the enamel wire is tightly wound on the terminal is applied to the surface on which the bobbin terminal is fixed. Then, I soldered the part where the enamel wire was loosely tangled.

  The enameled wire tangled in the terminal has a film remaining in the dense part, and the film is not melted in the sparse part. Since the portion without the film is soldered, solder erosion occurs, but it is hard to be disconnected because it is soldered to the terminal. Moreover, even if tension is applied between the part where the film remains and the part where the film is melted, the terminal is tightly entangled with the terminal, so the friction is large and the wire is difficult to break. In other words, disconnection accidents due to solder erosion are unlikely to occur.

  According to the present invention, it is no longer necessary to pull even a thin wire, the man-hour for making a coil is reduced, and the reliability against solder erosion is increased.

  The present invention can be applied to a coil for a relay and a coil for an inductor.

  FIG. 1 shows an inductor according to an embodiment of the present invention. FIG. 2 is an enlarged view of the curled portion of FIG.

  In FIG. 1, 1 is a bobbin, 2 is a core, 3 is a winding, and 4 is a terminal. Further, in FIG. 2, the hatched portion indicates a soldered portion.

  Soldering is performed by immersing the base of the terminal 4 in the solder bath. However, since the base portion is densely wound, heat hardly flows compared to the sparsely wound portion. On the other hand, the heat of the solder tends to flow around the sparsely wound portion. Therefore, it is possible to perform soldering by controlling the time of dipping in the solder bath, leaving the enameled wire film at the root portion.

  FIG. 3 shows an example of a jig made of the metal plate according to the second aspect of the present invention. FIG. 4 is a view in which the terminal 4 is immersed in the solder bath using the jig 5.

  In FIG. 4, when the lower surface of the jig 5 is immersed until it contacts the solder surface, the heat of the solder surface is temporarily cooled by the metal plate, and the portion where the enamel wire is tightly tangled to the terminal 4 is It becomes easier for heat to flow around, and it becomes easier to leave a film of enameled wire at the base of the bobbin 1.

Industry-academia availability

  In the production of a coil wound with a thin enameled wire, the possibility of use is high because it is effective as a method for preventing a disconnection accident due to solder erosion of the curled portion.

  An inductor according to an embodiment of the present invention.   It is an enlarged view of FIG.   This is an example of a jig made of a metal plate according to an embodiment of the invention described in claim 2.   It is the figure which is immersed in the solder tank using the jig of FIG.   It is a figure which shows an example of the curl by the conventional approach line.

Explanation of symbols

1 Bobbin 2 Core 3 Winding 4 Terminal 5 Jig made of metal plate

Claims (2)

  In the coil comprising a bobbin and an enameled wire that can be soldered without removing the film wound around the bobbin, and a terminal fixed to the bobbin that is soldered by bending both ends of the enameled wire, the enamel A coil characterized in that a portion of a wire that begins to be entangled is densely entrapped, a portion that is close to the end of the tangled portion is loosely tangled, and the portion that is loosely tangled is soldered.   Soldering by applying a jig made of a metal plate having a thickness close to the width of the portion where the enamel wire is tightly tangled to the terminal to the surface of the bobbin on which the terminal is fixed. The coil according to claim 1.

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