JP5216119B2 - Terminal connection structure - Google Patents

Description

The present invention relates to a terminal connection structure which is joined after a coil is wound around a terminal integrally formed with an insulator.

In the conventional terminal connection structure, after winding the coil from the base side of the terminal to the tip side, the coil is cut at the tip side and joined to the terminal. Generally, when winding the coil around the terminal, By providing protrusions or the like to form a non-linear shape, the coil position is stabilized and weldability is improved.
As a concrete example of the conventional example, there is JP-A-2003-086260 (Patent Document 1). In Patent Document 1, the terminal is divided into a tip portion, an intermediate portion, and a root portion, and the tip portion and the root portion are entangled with a small pitch, and the intermediate portion is tangled with a large pitch, and the coil is tangled. In this way, the number of coil windings is reduced to reduce disconnection defects.
In Japanese Patent Application Laid-Open No. 07-335291 (Patent Document 2), a projecting piece is provided on a terminal to limit a wire winding range, thereby preventing poor soldering and wire breakage.

Japanese Patent Laying-Open No. 2003-086260 (FIG. 1) Japanese Patent Laid-Open No. 07-335291 (FIG. 1)

  As a problem in the conventional terminal connection structure shown in Patent Document 1 and Patent Document 2, a coil is wound from the base side of the terminal toward the front end side, and this coil is cut at the front end side of the terminal. At this time, the terminal is bent due to the coil tension, resulting in a decrease in reliability at the time of joining.

Accordingly, an object of the present invention is to provide a highly reliable structure in connection between a terminal and a coil.

The present invention relates to a terminal connection structure in which a coil is wound around a terminal integrally formed with an insulator and then joined to the terminal. After the coil is wound from the root side to the tip side of the terminal, the coil is wound from the terminal tip side to the root direction. The reciprocating coil wound around the terminal is wound around the terminal from the root side to the tip direction and from the tip side to the root direction. The terminal connection structure is characterized in that the winding portion overlaps with a constant pitch equal to each other, and a resin is applied to the terminal base in order to fix the coil cut on the terminal base side .

According to this invention, after winding the coil from the terminal base side to the tip side, the terminal is bent by winding the coil again toward the base side and cutting it at the base side. In addition, since the coils are wound in an overlapping manner, it is possible to prevent the coil from being uncoupled before joining, and to improve the reliability. And the reciprocating coil wound around the terminal has a coil portion in which the winding portion from the root side to the tip direction of the terminal and the winding portion from the tip side to the root direction overlap with each other at a constant pitch. By eliminating fluctuations in the number of turns and coil looseness and fluctuations in position, the reliability can be further improved , and by applying resin to the terminal base to fix the coil cut at the terminal base side The cut coil can be elastically held to prevent the coil from being unwound .

It is the schematic which shows the terminal connection structure by Embodiment 1 of this invention. It is the schematic at the time of performing terminal connection by welding. It is the schematic at the time of performing terminal connection by soldering. It is the schematic at the time of apply | coating silicon to the terminal base. It is a schematic side view at the time of winding a coil around a resolver. It is a schematic side view at the time of performing the terminal connection of a resolver by welding. It is a schematic side view at the time of performing the terminal connection of a resolver by soldering.

Embodiments of the present invention will be described below.
Embodiment 1 FIG.
1 is a schematic view showing a terminal connection structure according to Embodiment 1 of the present invention, FIG. 2 is a schematic view when terminal connection is performed by welding, and FIG. 3 is a case where terminal connection is performed by soldering. FIG. 4 shows a schematic view when silicon is applied to the base of the terminal.

  1 to 4 show a terminal connection structure that is joined after the coil 5 is wound around the terminal 2 that is integrally formed with the insulating insulator 1. The insulating insulator 1 is made of a resin material such as polybutylene terephthalate (PBT) or nylon (PA), and a terminal 2 integrally formed with the insulating insulator 1 is provided. A coil 5 is wound from the root side 3 toward the tip side 4 along the outer peripheral surface of the terminal 2, and the coil 5 is wound from the tip side 4 toward the root side 3 so as to overlap the coil 5. The overlapping portion 7 is formed and cut at the root side 3.

When the coil 5 is cut at the terminal tip side 4 as in the prior art, there is a distance from the center of the rotating shaft (terminal base side 3) to the point of action (terminal tip side 4), so the action of the moment due to the coil tension. As a result, the terminal tip 4 was bent. However, by performing the coil cutting on the terminal base side 3 as in the present invention, the distance from the center of the rotating shaft to the action point is shortened, and the bending of the terminal 2 due to the coil cutting can be prevented.
In addition, the coil 5 wound from the root side 3 to the tip side 4 is pressed from the top by the coil 5 reciprocating from the tip side 4 to the root side 3 and wound in an overlapping manner to prevent the coil 5 from being unwound. The coil position can be stabilized. Further, since the coils 5 are overlapped at a constant pitch, there are no fluctuations in the number of coil turns wound around the terminal 2 and no looseness or fluctuations in the position of the coils 5, making the inspection process easy and reducing costs and reliability. Improvements can be achieved.

FIG. 2 is a schematic view when the terminal connection is made by welding.
The case where the coil 5 is wound around the terminal 2 as in the configuration shown in FIG. A torch is brought close to the vicinity of the terminal tip 4 and an inert gas, for example, argon gas or the like is jetted toward the terminal tip 4 to melt and join the terminal joint from the atmosphere. Here, if the terminal 2 is bent, the distance between the torch and the terminal 2 is not constant and the weldability varies, so the terminal winding of the coil 5 is reciprocated and the coil 5 is cut at the root. In addition, weldability is improved by preventing terminal bending.

  In addition, since at least one overlapping portion 7 of the coil 5 that melts into the terminal melting portion 8 during welding can hold the position of the coil 5 until the coil 5 melts into the melting portion 8. The position of the portion 8 can be stabilized, leading to cost reduction and improved reliability by simplifying the inspection process.

FIG. 3 is a schematic view when terminal connection is performed by soldering.
The case where the coil 5 is wound around the terminal 2 in the same manner as the configuration shown in FIG. Soldering is generally performed using a soldering apparatus. The soldering apparatus in the partial jet solder method is provided with a solder bath, in which a sufficient amount of molten solder is stored, and the tip end side of the terminal 2 around which the coil is wound is immersed to form a solder portion 9. Electrically join. In the soldering method, a soldering iron having a tip heating heater is provided at the tip of an arm of a robot or the like that is automatically controlled. The soldering iron approaches the vicinity of the terminal tip 4 and is threaded from the solder supply nozzle. Is supplied, and a solder in a molten state is attached to the tip 4 of the terminal, thereby creating a solder portion 9 for electrical joining.

The material of the terminal 2 is made of oxygen-free copper or phosphor bronze. Cost reduction can be achieved by using relatively inexpensive oxygen-free copper. Moreover, by using phosphor bronze, the amount of soot generated can be reduced, leading to improved weldability.
As for the material of the coil 5, the heat resistance temperature of the coil 5 is improved and the reliability is improved because the copper wire portion and the insulating layer are coated with a polyamide-based or polyester-based fusion layer. Specifically, self-fused polyester imide is used.

  FIG. 4 is a schematic view when the resin 10 is applied to the terminal base 3. The cutting coil 6 cut at the terminal base side 3 is elastically deformed by the coil tension at the time of cutting, and is along the outer peripheral surface of the terminal 2. Since the cutting coil 6 is not fixed to the end, for example, a resin 10 such as silicon is applied to the cutting coil 6 and is elastically held to prevent the coil from being unwound.

Embodiment 2. FIG.
5 is a schematic side view when a coil is wound around a resolver according to Embodiment 2 of the present invention, FIG. 6 is a schematic side view when a resolver terminal is connected by welding, and FIG. 7 is a resolver. It is a schematic side view at the time of performing terminal connection of this by soldering.
The resolver, which is a rotation sensor, includes a first insulator 12 and a second insulator 13 provided on both surfaces of an annular stator core 11, and the terminal 2 is integrally formed with one or both of the first insulator 12 and the second insulator 13. Has been. In FIG. 5, the stator core 11 is connected to the terminal 2 by a coil 5 wound around a first insulator 12.

Also in FIG. 5, as described in FIG. 1, the coil 5 is wound from the root side toward the tip side along the outer peripheral surface of the terminal 2, and further from the tip side to the root side so as to overlap the coil 5. To form an overlapping portion and cut at the root side. FIG. 6 is a schematic side view when the terminal connection of the resolver is performed by welding. As described in FIG. 2, at least one overlapping portion of the coil 5 that melts into the terminal melting portion 8 during welding is provided. ing.
FIG. 7 is a schematic side view when the terminal connection of the resolver is performed by soldering. As described with reference to FIG. 3, the soldering is performed by a partial jet soldering method or a soldering iron method.
5, 6, and 7, the first insulator 12 and the second insulator 13 are separate, and the stator core 11 is sandwiched from both sides, but the stator core 11, the insulator 1, and the terminal A configuration in which 2 is integrally molded may be used.

  DESCRIPTION OF SYMBOLS 1 Insulator, 2 Terminal, 3 Root side, 4 Tip side, 5 Coil, 6 Cutting coil, 7 Overlay part, 8 Melting part, 9 Solder part, 10 Resin, 11 Stator core, 12 1st insulator, 13 2nd insulator.

Claims (7)

In the terminal connection structure in which the coil is wound around the terminal integrally formed with the insulator and then electrically connected, after the coil is wound from the root side to the tip direction of the terminal, from the terminal tip side to the root direction . Coils are wound in layers and cut at the base side, and the reciprocating coil wound around the terminal is wound around the terminal from the root side to the tip direction and from the tip side to the root direction. A terminal connection structure characterized in that resin is applied to the terminal base in order to fix the coil cut at the terminal base side, while overlapping with each other at a constant pitch equal to each other.   The terminal connection structure according to claim 1, wherein in the connection between the coil and the terminal, the connection means is soldering.   The terminal connection structure according to claim 1, wherein in the connection between the coil and the terminal, the connection means is welding. The terminal connection structure according to claim 3 , wherein the terminal connection structure has at least one location where coils that enter the terminal melting portion overlap at the time of welding.   The terminal connection structure according to claim 1, wherein the terminal material is oxygen-free copper or phosphor bronze.   The terminal connection structure according to claim 1, wherein the terminal winding coil is coated with a polyamide-based or polyester-based fusing agent.   The terminal connection structure according to claim 1, wherein the terminal connection structure is applied to a resolver that is a rotation sensor.

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