JPS61121734A - Stator for rotary electric machine - Google Patents

Abstract

PURPOSE:To prevent varnish from infiltrating into a lead wire, by disconnecting a capillary tube between an insulation-braided section and a cable, conductor of the lead wire. CONSTITUTION:The end section of the cable core conductor 2 of a lead wire 1 is connected to a stator coil end 6 to be twisted together and welded. Some section of the insulation-braided section 3 of the lead wire 1 is longitudinally heated and burnt out, and the cross sections are welded with welded sections 4a, 4b where synthetic resin insulation substance organizing the insulation- braided section 3 is dissolved and solidified. Solder is fitted on the section of the cable conductor where the insulation-braided section 3 of the elad wire 1 is burnt out and exposed, and a soldered section 5 is formed with the solder. The capillary tube of the insulation-braided section 3 of the lead wire 1 is disconnected with the welded sections 4a, 4b on the cross sections, and the capillary tube of the cable conductor 2 is disconnected with the soldered section 5. In this manner, varnish can be prevented from infiltrating into due to capillarity action.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a stator for a rotating electric machine, and more specifically, a coil is wound around an iron core, and a core wire made of stranded wire and a synthetic resin insulated wire are attached to the coil. A rotating electric machine suitable for preventing penetration of varnish due to capillary action between the insulating braided part and the core wire when fixing the coil by performing varnish treatment after connecting the lead wire constituted by the insulating gML part made of material. Regarding the stator for use.

[Background of the invention]

This type of stator for rotating electric machines has a coil wound around the iron core.
A lead wire is connected to the end of this coil, and then varnished to fix the coil to the iron core or bobbin.

By the way, the lead wire is composed of a core wire made of a stranded wire and an insulated Hi assembly part made of a synthetic resin insulating material. Therefore, the varnish penetrates into the lead wire during varnish treatment due to capillary action in the core wire and the insulating braided portion. If the varnish penetrates into the lead wire and solidifies, it loses its flexibility.
During use as a stator for a rotating electric machine, when electromagnetic vibration occurs when an excitation current is passed through the coil, the lead wire portion may become unable to absorb the electromagnetic vibration and may break.

Prior art techniques for preventing penetration of varnish into the lead wire include the one disclosed in Japanese Patent Publication No. 57-51250 (hereinafter referred to as the first prior art) and the one disclosed in Japanese Patent Publication No. 59-21
There is a technique disclosed in Japanese Patent No. 246 (hereinafter referred to as the second prior art).

In the first prior art, a liquid having a boiling point higher than the varnish solvent is attached to the lead wire, and the coil is insulated with the varnish before the liquid evaporates completely. In this first prior art, it is possible to prevent the varnish from penetrating into the insulating braided part of the lead wire and the capillary part of the core wire, but recently the varnish processing temperature has increased, and the liquid used for sealing has a high boiling point. Even if an oil-based varnish is used, if the varnish is treated at high temperatures, the viscosity will decrease, resulting in a problem in that the penetration prevention effect of the varnish will be reduced.

The second prior art has a part of one outlet wire (lead wire),
A pawl is provided to prevent varnish from penetrating. This pawl is formed by a core wire 61, as shown in FIG. 6, for example.
A lead wire 6 consisting of a first braided layer covering this core wire 61, a polyester film layer 62 wound around this, and a second braided layer 63 covering this polyester film layer 62.
0, a portion of the second braided layer 63 is removed to expose the polyester film layer 62, which serves as a pawl. Further, as another example of the pawl part, a metal tube 64 is placed over a part of the 1-ro output wire 60 as shown in FIG.

This metal tube 64 is caulked. Furthermore, a pawl portion that combines the techniques shown in FIGS. 6 and 7 is also illustrated.

In FIGS. 6 and 7, reference numeral 65 indicates a coil leg, and 66 indicates a portion where the coil leg and the core wire of the lead wire are twisted together and welded.

However, in the second prior art, in the pawl portion as shown in FIG.
There is a concern that penetration of the varnish due to capillary action cannot be avoided. In addition, in the pawl shown in FIG. 7 of the second prior art, the varnish penetration prevention effect varies depending on the caulking force of the metal tube 64, so variations in the caulking force cause variations in the varnish penetration prevention effect of the product. There is a risk that this may occur.

[Purpose of the invention]

An object of the present invention is to solve the problems of the prior art described above, to prevent varnish from penetrating into the lead wire even when varnish treatment is performed at high temperatures, and to prevent varnish from penetrating through the core wire and the insulating braided part due to capillary action. It is an object of the present invention to provide a stator for a rotating electric machine which can more effectively prevent varnish penetration and has less variation in varnish penetration prevention effect.

[Summary of the invention]

The present invention involves heating and fusing a part of the insulating braided portion of the lead wire in the length direction, welding the cut surface, soldering the exposed core wire, and soldering the welded portion of the cut surface with the solder. This is characterized in that the capillary tube between the single-outlet wire can assembly and the core wire is immediately cut by the raised portion, and with this configuration, all of the above objects can be achieved.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which a lead wire 1 is composed of a core wire 2 made of a twisted wire of fine wires, and an insulating braided portion 3 made of a synthetic resin insulating material such as polyester. ing.

The end of the core wire 2 of the lead wire 1 is twisted and connected to the coil leg 6 of a stator coil (not shown) by welding, and the welded portion is indicated by reference numeral 9.

A portion of the insulating braided portion 3 of the lead wire 1 in the length direction is heated and burnt off, and the cut surface is covered with welded material made by melting and solidifying the synthetic resin insulating material constituting the insulating braided portion 3. The parts 4a and 4b are welded together. The portion where the insulating braided portion 3 is burned out is preferably set at a portion that is not easily affected by heat when the lead wire 1 and the coil leg 6 are twisted together and welded.

Solder is attached to the exposed core wire portion of the lead wire 1 when the insulating braided portion 3 is burned off, and this solder is used for preheating when burning off a portion of the insulating braided portion 3 and for heating again. The solder fried portion 5 is formed by melting and penetrating by the heat generated.

Then, the capillary tube of the insulating braided portion 3 of the lead wire 1 is immediately cut by the welded portions 4a and 4b on the cut side, and the
The capillary tube of JA2 is cut by the soldering part 5.

In this embodiment, the end of the lead wire 1 is covered with a polyester tube 8 that is impermeable to varnish, and the end of this polyester tube 8 is welded to the end face of the lead wire 1, and the welded portion 9 provides insulation. 6 In the stator for a rotating electrical machine of the above embodiment, which is designed to prevent penetration of varnish into the braided portion 3, the insulating braid of the lead wire 1 is connected to the coil by twisting and welding with the coil leg 6. Burn off part of part 3,
At the time of baking, welds 4a and 4b are formed on the cut surface, and the capillaries of the insulating braided part 3 are immediately cut off by the welds 4a and 4b, and a solder fried part 5 is formed by melting solder into the exposed core wire. core! Since the capillary tubes 2 are immediately cut, it is possible to reliably prevent the varnish from penetrating the core wire 1 due to capillary action in the core wire 2 and the insulating braided portion 3 when varnishing the coil.

Next, Figures 2 to 5 show the processing steps for the lead line.

The process of connecting the processed lead wire and the coil leg is shown.

First, as shown in FIG. 2, solder the part of the insulated braided part 3 of the first lead wire 1 that is less affected by the heat when the core wire 2 of the lead wire 1 and the coil leg 6 are twisted together and welded. Approximately 200 to 300
Heat to 00℃ and burn it off.

At this time, the cut surfaces of the insulating braided portion 3 are melted and solidified to form welded portions 4a and 4b, and the welded portion 4a.

4b, the capillary tube in the insulating Jf section 3 is cut off.

As described above, by burning off a portion of the aaI combination portion 3, a portion of the core wire 2 is exposed.

After burning off a portion of the insulating braided portion 3, solder is applied to the exposed core wire 2' while it is being heated, and as shown in FIG. 3, the solder is melted by heating with a heating device 10. , the core wire 2' is soldered and fried, and the fried part 5
The capillary tube of the core wire 2' made of stranded wire is cut off.

Next, the polyester tube 8 is placed over the end of the lead wire 1 that has been processed as described above, and as shown in FIG. is heated by the heating device 10, and the polyester tube 8 is welded to the end face of the insulating braided portion 3 of the lead wire 1 via the welding portion 9.

Then, say it! The core wires at the ends of the wires 11 and the coil legs 6 are twisted together, soldered, and connected via welds 7, as shown in FIG.

Then, the coil is immersed in a varnish bath and subjected to varnish treatment to obtain a stator for a rotating electrical machine.6 [Effects of the Invention] According to the present invention described above, a core wire made of stranded wires and a
A part of the insulating braided part of the lead wire, which is composed of an insulating braided part made of a synthetic resin insulating material, is burned off, the cut surface is welded, and the exposed core wire is soldered, and the welded part of the cut surface is welded. Since the capillary between the insulating braided part of the lead wire and the core wire is immediately cut by the soldering part and the soldering part, it is possible to reliably prevent varnish from penetrating through the core wire and the insulating braided part of the lead wire due to capillary action. be.

Further, according to the present invention, as described above, the welded portion formed on the cut surface of the insulating braided portion and the solder fried portion formed on a portion of the core wire prevent varnish from penetrating into the lead wire. Therefore, even during varnish treatment at high temperatures, it has the effect of preventing varnish penetration, and it also has the effect of reducing variations in the varnish penetration prevention effect.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the main parts of an embodiment of the present invention, and FIGS. 2 to 5 are examples of processing steps and steps for connecting one output wire and a coil leg, respectively, for carrying out the present invention. FIGS. 6 and 7 are a side view and a partially cutaway side view showing the prior art. 1... Lead wire, 2... Core wire of the lead wire, 3... Insulated braided part, 4a, 4b... Welded part of the cut surface of the insulated braided part, 5... Solder of the core wire Lifted part, 6... Coil leg to be twisted together with the core wire of the lead wire and welded, 7... Welded part, 8... Polyester tube covered over the end of the lead wire, 9... The welded part between the insulating braided part and the polyester tube. Agent Patent Attorney Tadashi Akimoto Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] A rotation process in which a coil is wound around an iron core, a lead wire consisting of a core wire made of wire and an insulating braided part made of a synthetic resin insulating material is connected by this coil, and the coil is fixed by applying varnish treatment. In a stator for an electric machine, a part of the insulating braided part of the lead wire is burned off, the cut surface is welded, and the exposed core wire is soldered, and the welded part and the solder fried part of the cut surface are combined to A stator for a rotating electrical machine, characterized in that the capillary tube between the insulating braided part of the lead wire and the core wire is cut off.