JPH0318254A - Protecting method for lead wire at time of overall-vacuum-pressure-appliction-impregnating treatment of coil - Google Patents

Abstract

PURPOSE:To prevent resin from being infiltrated into the armor section of a lead wire by covering the outer periphery of the lead wire with a protective member, and by forming a coil and a lead wire joint integrally for overall vacuum pressure application impregnating treatment. CONSTITUTION:The outer periphery of a lead wire 3 consisting of a plurality of wires 4 is covered with an insulating layer 11, and the outer periphery of the insulating layer 11 is protected by glass-braided wires, and is set to be an armor section 12. The glass-braided wires are respectively removed by l1, l2, and the insulating layer 11 is exposed, and the outer periphery of the lead wire 3 is covered with a heat- shrinking tube 13, and at both ends, the sections of the exposed insulating layer 11 of the load wire 3 are positioned. Both ends of the heat-shrinking tube 13 come in close contact with the outer periphery of the insulating layer 11 by heat shrinking due to heating, and are sealed with sealing material 14 in order to prevent resin from being infiltrated at the time of impregnating treatment. As a result, even if the lead wire is dipped in resin solution together with a core with a built-in coil at the time of the impregnating treatment, the resin can be prevented from being infiltrated into the armor section of the lead wire.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to first connecting the lead wire of a rotating electrical machine such as a motor or generator to a coil, and then connecting the lead wire connection portion. When impregnating the entire coil with vacuum pressure,
The present invention relates to a method for protecting a lead wire during vacuum pressure impregnation treatment of the entire coil in order to prevent resin from penetrating into the exterior portion of the lead wire.

[Conventional technology]

For coils inserted into the iron core of rotating electric machines, an insulating tape such as mica tape is wrapped around the surface of the coil conductor to form an insulating layer, and a glass cloth tape or the like can be further wrapped several times around the surface of this insulating layer. The exterior part has been reshaped.

The coil with the insulating layer formed in this way is inserted into the iron core of a rotating electric machine, and in this state, the entire coil is impregnated with an insulating resin (varnish) such as epoxy resin under vacuum pressure, and then the entire coil is By heating the insulating resin, the insulating resin is cured and the coil is completely insulated. This type of coil insulation treatment method is called the whole vacuum pressure impregnation method, and the entire coil incorporated in the core is impregnated with vacuum pressure, so the reliability of the coil insulation is high. It has characteristics.

On the other hand, a rotating electrical machine is provided with a lead wire for supplying power to the coil or extracting power from the coil, and this lead wire is provided at the lead part of the coil. Used for connection between coil lead and terminal box.

The conventional method of insulating coils using the whole vacuum pressure impregnation method is to insert a coil with an insulating layer on its surface into the iron core of a rotating electrical machine, as described above, and then insert the coil into the iron core of a rotating electric machine. is impregnated with resin under vacuum pressure, and then
The coil lead, which is the exposed part of the coil, was connected to the lead wire, and the connection between the two was insulated.

That is, after the entire coil incorporated in the iron core of a rotating electric machine is impregnated with resin under vacuum pressure, the coil and the lead wire are connected. The connection between this coil and the guide wire must also be insulated.

The conventional method of insulating the lead wire connection portion will be briefly described.

In Fig. 5, the coil lead l, which is the exposed part of the coil.
is made of the same or equivalent conductor as the coil, and is subjected to the same insulation treatment as the coil portion, and a predetermined length of the coil conductor 2 is exposed at the connecting portion at the end thereof.

The eyeliner 3 is made by bundling a large number of thin wires 4 and applying an insulating coating to the outer circumferential surface, and a large number of the wires 4 are exposed at the connecting portion at the end thereof.

To connect coil lead 1 and lead wire 3, connect lead wire 3.
The coil conductor 2 exposed at the end of the coil lead 1 is inserted between a large number of strands 4 exposed at the end of the lead wire 3, and the coil conductor 2 is inserted between the strands 4 of the blind wire 3 and the coil conductor. A brazing material such as hard solder is poured into the part where the coil conductor 2 and the lead wire 3 are connected electrically to form a conductor connection part 5. Next, the conductor connection part 5, the wires 4 of the lead wires 3 on both sides, and the coil conductor 2 are filled with an insulating compound and sealed, thereby forming the filled part 6. The difference in diameter between the coil lead 1 and the lead wire 3 is made gentler, and the stepped portion formed around the conductor connection portion 5 is eliminated. After that, a Bripreg mica tape is wound around the outer periphery of the filled part 6 which has been filled with an insulating compound, or this mica tape is coated with an epoxy resin on a general mica tape.
The insulating layer 7 was formed by winding the wire, thereby insulating the lead wire connection portion 8'. Note that 9 in the figure indicates an exterior portion formed by wrapping a protective tape around the outer periphery of the insulating layer 7 in order to protect it.

As described above, the conventional connection between the coil and the drawing wire was performed after the entire coil incorporated in the iron core of the rotating electric machine was subjected to vacuum pressure impregnation treatment, which caused the following problems.

(1) Since the entire coil including the coil lead is impregnated with insulating resin, the insulation properties of the coil are significantly improved. The insulating layer 7 is formed by winding a Bripreg mica tape around the output wire connection part, or by winding the mica tape while applying epoxy resin to a general mica tape, and then applying heat curing or the like. Therefore, in this insulation treatment method, voids are generated inside the insulating layer 7, which causes a decrease in insulation properties, and after insulating the entire coil, mica is added to the lead wire connection part. Workability is poor because the tape is wound and heat cured.

(2) Since the coil and the lead wire are connected after vacuum pressure impregnation treatment is applied to the entire coil, the coil lead l connected to the lead wire is impregnated with insulating resin and has flexibility. is becoming scarce. For this reason, if you bend the coil lid 1 to connect it to the guideline,
Cracks may form in the insulating layer in this area, reducing the insulation properties of the coil.

(3) In order to eliminate the above-mentioned problems, simply connect the lead wire to the coil and then vacuum apply insulating resin to the entire coil incorporated in the iron core, including the lead wire connection part. When pressure impregnated, the insulating resin that has penetrated into the insulating layer of the coil lead 1 due to the suction effect of the vacuum passes through the continuous gap formed in this part and forms the lead wire 3.
It penetrates between the strands 4 and hardens. This causes the lead wire 3 to have poor flexibility, making it impossible to smoothly store the lead wire 3 in the casing or to easily pull it out from the terminal box.

Therefore, the present applicant first connects the coil lead and the lead wire, and then applies insulating resin to the coil incorporated in the core and the lead wire connection part, and applies a vacuum to the entire body. Another article states that by impregnating the lead wire connection part, the insulation of the lead wire connection part is integrated with the insulation of the coil, thereby increasing the insulation of the lead wire connection part and improving the workability for connecting the lead wire. The patent application was filed at the same time as this patent application.

The whole vacuum pressure impregnation method is performed by immersing the entire core with the coil installed in a resin liquid tank provided in a vacuum chamber, so if the above impregnation treatment is performed with the drawing wire connected to the coil, Part or all of the lead wire is immersed in the resin liquid. The lead wire is protected by being covered with a glass braided wire, etc. During the impregnation process, if this exterior part is impregnated with resin and hardened, the flexibility of the lead wire will be significantly impaired.
It becomes impossible to freely store the lead wire in the casing or pull it out from the terminal box.

[Problem to be solved by the invention]

The present invention mainly involves connecting the lead wire of a rotating electric machine to a coil first, and then, when the lead wire connecting portion is integrated with the coil and the entire body is vacuum-pressurized impregnated, the exterior of the lead wire is This was done with the aim of preventing the parts from being impregnated with resin and losing their flexibility.

[Means to solve the problem]

In order to solve the above-mentioned problems, the means adopted by the present invention is that after the coil lead and the lead wire are connected, the coil incorporated in the iron core and the lead wire connection part are integrally coated with insulating resin. In a method for connecting Hiji cotton that is impregnated with vacuum and pressure, a protective member is placed over the outer periphery of the lead wire to prevent insulating resin from penetrating into the exterior part of the lead wire, and the coil and the lead wire are connected. The impregnation treatment is performed integrally with the connecting portion.

[Action of the invention]

Since the outer periphery of the lead wire connected to the coil is covered with a protective member, the entire core is immersed in the resin liquid bath, and some or all of the lead wire is immersed in the resin liquid. However, the resin will not infiltrate the exterior of the lead wire.

Therefore, even if the lead wire connection part and the coil are integrated and subjected to vacuum pressure impregnation treatment, the lead wire maintains its original flexibility and can be stored in the casing or in the terminal box. You can take it out without any trouble.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Note that the same parts as those described in the above-mentioned "prior art" section will be described with the same reference numerals.

The coil lead 1 and the lead wire 3 are connected first, and then the coil incorporated in the iron core and the lead wire connection part 8 are connected.
A method for connecting lead wires by integrally impregnating insulating resin with vacuum pressure (hereinafter abbreviated as "lead wire tipping method")
The contents of the present invention will be explained in parallel with the explanation.

As shown in FIGS. 1 and 2, the lead wire 3 is made up of a large number of wires 4 bundled together, the outer periphery of which is covered with an insulating layer 11, and the outer periphery of this insulating layer l1 is The exterior part 12 is protected by a glass braided wire.

The glass braided wires forming the exterior parts 12 at both ends of the lead wire 3 each have a length g. ．． I22 has been removed to expose the insulating layer 11, and the outer periphery of the lead wire 3 is covered with a heat-shrinkable tube 13, and the insulating layer 1l of the lead wire 3 is exposed at both ends. It is located in the part where it is located. Both ends of the heat-shrinkable tube 13 are in close contact with the outer periphery of the insulating layer 11 due to heat shrinkage caused by heating, and are also sealed with a sealing material 14 such as a silicone rubber compound to prevent resin from entering during the impregnation process. It has been sealed.

The above-mentioned method of attaching the lead wires first involves coil lead 1 and lead wire 3.
After connecting the coil built into the iron core and
This is a method of integrally impregnating an insulating resin with the lead wire connecting portion 8 under vacuum pressure, and the connection between the bow continuous coil lead 1 and the lead wire 3 will be explained.

In FIGS. 1, 3, and 4, a coil conductor 2 exposed at the end of the coil lead 1 is placed between a large number of strands 4 exposed at the end of the lead wire 3. After inserting a predetermined length, pour a soldering material such as hard solder or solder into the part where the wire 4 of the lead wire 3 and the coil conductor 2 meet from the coil conductor 2 side, and make the eye. The wire 4 of the wire 3 and the coil conductor 2 are electrically connected to form a conductor connection portion 5 [the length of which is (
In the above-mentioned lead line prepending method, L.I-) in FIG. The brazing material is also poured into a portion of only the wire 4 of the lead wire 3 indicated by L and the coil conductor 2. In particular, in the part where only the strands 4 of the lead wire 3 are,
A brazing material is poured over the entire cross-section of the section so that no continuous gap is formed along the axial direction, thereby forming an insulating resin infiltration prevention section (g3). This is because when the entire body is impregnated with insulating resin under vacuum pressure after connecting the coil lead 1 and the lead wire 3, the resin that has penetrated into the coil conductor 2 due to the suction effect of the vacuum is removed from the conductor connection area. 5
This is a measure to prevent the wire from entering between the strands 4 of the lead wire 3 through the wire.

When the coil conductor 2 and the element vA4 of the lead wire 3 are connected in this way, this conductor connection portion 5, the element wire 4 of the lead wire 3 on both sides, and the portion of the coil conductor 2, The filled portion 6 is formed by filling and sealing an insulating compound such as silicone rubber compound or epoxy resin compound.

The purpose of forming the filling part 6 on the outer periphery of the conductor connection part 5, the coil conductor 2 on both sides thereof, and the strands 4 of the lead wire 3 is exactly the same as in the conventional method, but in the lead wire advance method, ,
A predetermined length of lamp (
The lamp length is indicated by 25) and is filled with an insulating compound to form the filling part 6.

This is because when the coil conductor 2 and the wire 4 of the lead wire 3 are connected by brazing, the sheathing part of the lead wire 3 may be burned out due to the brazing heat. The burnt part of the covering part or the insufficiently covered part of the end of the lead wire 3 is covered with a filler material, and the entire insulating resin is vacuum-pressurized impregnated after the coil lead 1 and the lead wire 3 are connected. At this time, the strands 4 of the lead wire 3 are removed by the suction action of the vacuum.
From the part where brazing material is not poured in, this wire 4
This is a measure to prevent resin from entering the inside.

and,! An insulating layer 7 is formed by winding several layers of mica tape, which is an insulating tape, around the outer periphery of the filled part 6 formed by the edge compound.

After connecting the coil lead 1 and the outlet wire 3 in this way, the entire core is immersed in a resin liquid tank provided in a vacuum chamber, and the coil inserted into the core and the outlet When the entire wire connection part 8 is impregnated with insulating resin under vacuum pressure, part or all of the lead wire 3 is immersed in the resin liquid, and the outer periphery of the lead wire 3 is covered with a heat-shrinkable tube 13. Therefore, the resin will not infiltrate between the glass braided wires forming the exterior portion 9 of the lead wire 3. In addition, when the coil and the lead wire connection part 8 are integrated and impregnated with vacuum pressure, it is desirable to take out the end of the lead wire 3 opposite to the connection part from the resin liquid bath. When the entire lead wire 3 is immersed in the resin liquid, if the other end is sealed with a sealing material such as silicone rubber compound, the entire lead wire 3 can be immersed in the resin liquid. There is no problem if you let them go.

Further, when the coil and the lead wire connecting portion 8 are entirely impregnated with vacuum pressure, the insulating layer 7 of the lead wire connecting portion 8 is impregnated with vacuum pressure.
The insulating resin infiltrates and is impregnated between the mica tapes forming the mica tape, but as mentioned above, an insulating resin infiltration prevention section (g3) is provided in only the portion of the wire 4 of the lead wire 3. At the same time, the covering part of the lead wire 3 is filled with insulating compound to form a filling part 6, so that there is insulating resin between the wires 4 of the lead wire 3. will not infiltrate. For this reason, the coil lead 1 and the lead &? Even if the entire core in which the coil is installed is immersed in the resin solution and the guide wire connection part 8 is immersed in the resin solution after connecting the guide wire 3 with
The resin will not penetrate into the inside of the wire 4.

For this reason, even if the coil incorporated in the iron core and the lead wire connection part 8 are integrally impregnated with insulating resin under vacuum pressure using the lead wire pre-attaching method, the flexibility of the lead wire 3 is impaired. It has maintained its original flexibility.

In addition, the present invention provides a structure in which the outer periphery of the lead wire is covered with a protective member to prevent insulating resin from penetrating into the exterior portion of the lead wire, and the coil and the lead wire connection portion are integrated into one whole. There is a gist in performing the vacuum pressure impregnation treatment, and in the above embodiment, an example was given in which a heat-shrinkable tube was used as a protective part covering the outer periphery of the drawing line, but this is just an example. Other protective members include tape strips such as Teflon film tape and polyester film tape. For example, a Teflon film tape is wrapped around the outer periphery of the marking line for a predetermined length, and then wrapped around the outer periphery of the Teflon film tape. The lead wire can also be protected by winding a heat-shrinkable Teflon film tape in the same manner and heating the Teflon film tape to heat-shrink it. Furthermore, there is also a method of using silicone grease as a protective member and applying it to the exterior part of the lead wire.

In FIG. 1, after the lead wire connection portion 8 is impregnated, a protective tape is wound around the outer periphery of the insulating layer 7 to form an exterior portion 9.

〔Effect of the invention〕

The present invention covers the outer periphery of the lead wire with a protective member to prevent insulating resin from penetrating into the exterior part of the lead wire, and integrates the coil and the lead wire connection part to apply a vacuum to the entire body. Since pressure impregnation treatment is performed, resin can be prevented from penetrating into the exterior of the lead wire even if the lead wire is immersed in the resin liquid together with the iron core in which the coil is incorporated during the impregnation process. .

For this reason, depending on the method of connecting the lead wire, in which the coil and the lead wire are connected first, and then the lead wire connection part is integrated with the coil and the whole body is vacuum-pressurized and impregnated, the lead wire has not lost its flexibility and maintains its original flexibility.

[Brief explanation of the drawing]

1 to 4 are diagrams for explaining the present invention, and FIG. 1 shows the eyeliner 3 connected by the method of the present invention.
2 is an enlarged sectional view taken along the line nn in FIG. 1, and FIGS. 3 and 4 are sectional views taken along the line ■1■ and TV-IV in FIG. 1, respectively. It is. FIG. 5 is a cross-sectional view of the connecting portion of the lead wire 3 connected by the conventional method. Explanation of the symbols of the main parts constituting the present invention is as follows. 1: Coil lead 3: Lead wire 4: Basic wire! a 8: Lead wire connection part 11: Insulating layer of lead wire 12: Exterior part of lead wire 13: Heat-shrinkable tube (protective member) 14: Sealing material

Claims (3)

[Claims] (1) After the coil lead and the lead wire are connected, the coil incorporated in the iron core and the lead wire connection part are integrally impregnated with insulating resin and the whole is vacuum-pressurized. , covering the outer periphery of the lead wire with a protective member for preventing insulating resin from penetrating into the exterior part of the lead wire;
A method for protecting a lead wire during vacuum pressure impregnation treatment of the entire coil, characterized in that the coil and the lead wire connection portion are integrally impregnated. (2) The method for protecting a lead wire during whole vacuum pressure impregnation treatment of a coil according to claim 1, wherein the protective member is a heat-shrinkable tube. (3) The protective member consists of a Teflon film tape and a heat-shrinkable polyester film tape, and the Teflon film tape is wrapped and wound around the lead wire for a predetermined length, and the heat-shrinkable polyester film is further wrapped around the outer periphery of the lead wire. 2. The method of protecting a lead wire during whole-body vacuum pressure impregnation treatment of a coil according to claim 1, wherein the tape is wound in the same manner and subjected to heat shrinkage treatment.