JPS5951113B2 - How to connect heat-resistant insulated wires - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for connecting a heat-resistant insulated wire for connecting a highly heat-resistant magnet wire to another electrically conductive material.

BACKGROUND OF THE INVENTION The use of a view sink as a conventional magnet wire connection method is well known in the field of electric motors and the like.

This view sink applies mechanical pressure to the connection part and then turns on electricity to weld the connection part using Joule heat.It has the characteristic that the connection is completed quickly and is suitable for automation. On the other hand, electric devices in recent years are required to have high heat resistance in order to be miniaturized, and therefore magnet wires are also made heat resistant.

The most effective heat-resistant magnet wire is one in which a glass-like or ceramic-like insulating layer is formed by firing inorganic fine powder.

However, these inorganic insulated wires cannot be used with the view sink connection described above. The reason for this is that even if a view sink electrode is pressed against a glass-like or ceramic-like insulating layer, it is difficult to conduct electricity because the insulating layer is strong.

Therefore, with the conventional technology, it has been impossible to complete electrical connections at high speed using magnet wires with high heat resistance. If this becomes possible, it will be possible to provide electrical products that are highly heat resistant, compact, and have high output while still allowing high-speed assembly of motors and the like (particularly the connection of electric wires) as before.

Purpose of the Invention In view of the above points, an object of the present invention is to provide a method for connecting heat-resistant insulated wires that can complete electrical connections at high speed using magnet wires having high heat-resistant performance. It is.

Configuration of the present invention The configuration of the method of the present invention will be explained below.

The present invention basically uses a magnet wire having an inorganic insulating coating made of unmolten glass, green ceramic, or a green ceramic analogue, and the Beuzink technology. is applied between the conductor and the insulating coating of the electric wire), and the inorganic insulating coating moves so as to separate in the longitudinal direction of the conductor, so that the viewzink electrode easily and directly contacts the conductor of the electric wire. It was devised. For this purpose, in the present invention, a suspended inorganic substance in which a binder is added to an inorganic fine powder is applied around the conductor, and the inorganic fine powder in the suspended inorganic substance melts into a glass-like state, or forms a ceramic ivy. Alternatively, as a ceramic analog, the suspended inorganic substance is heated to an extent that does not become extremely inflexible to form a semi-hardened film exhibiting some plasticity and flexibility, and an organic insulating layer is formed on this film. magnet wire overcoated with
This utilizes ViewZinc technology.

This magnet wire is selected from a material and having a thickness such that the organic insulating layer will crack when the view-zinc electrode is pressed onto the organic insulating layer.

After the cracks are generated, a step of pushing the inorganic film apart in the longitudinal direction of the conductor is performed using the Viewzink electrode, and then the conductor and the Viewzink electrode are electrically connected.

The organic insulating layer and the film containing the inorganic fine powder are made of materials and compositions such that the interlayer bonding force between the organic insulating layer and the coating film containing the inorganic fine powder is weakened so that the crack spreads after a crack occurs in the organic insulating layer.

To this end, it is necessary to specify the material of the binder, the material of the organic insulating layer, and insert a mold release agent between the two.

Even if the inorganic fine powder in the suspended inorganic substance is SiO, which has a low melting point,
2. Even if it is a fine powder of PbO-B2O3 glass, it is baked at a low temperature that will not melt it, so the coating has a certain degree of flexibility (mobility), which makes it suitable for Viewzink electrodes. Contact between the conductor and the View Zinc electrode is easily completed with a pressure of .

Then, when electricity is applied, the organic insulating layer is partially carbonized and burnt due to the Joule heat caused by the electricity, and a part of the inorganic insulating film is also blown away by the generated gas.

In this way, the connected heat-resistant insulated wire is coated with an inorganic insulating film containing unmelted inorganic fine powder on the conductor, except for the Viewzink part, so that overcurrent may flow through the conductor. When the temperature reaches a high temperature, the inorganic fine powder in the coating melts and the surface becomes glass-like.
Since it is made of ceramic or something similar to ceramic ivy, it becomes an electric wire overcoated with a highly heat-resistant inorganic coating, exhibiting sufficient heat resistance performance, and the insulation properties are less likely to be fatally deteriorated by high temperatures.

EXAMPLES OF THE INVENTION The manufacturing process of the magnet wire used in the method of the present invention will be explained below.

A first embodiment of this magnet wire is shown in FIG.

In this drawing, the surface of a conductor 7 made of Cu is pretreated with, for example, nickel plating.

Next, the SlO2/PbO-B2O3 glass was
The powder is ground to 450 mesh, Cr2O3 is added if necessary, and this is mixed in a 30% organic silicone varnish solution serving as a binder, for example, to create a suspended inorganic substance in a weight ratio of 1:2. Then, apply this suspension to the conductor 7 for about 30 minutes.
The inorganic insulating film 16 is formed on the conductor by heating at 00 to 500°C to scatter the solvent.

(For reference, conventional ceramic wires are fired at 800 to 1200°C to form a glassy surface coating in such cases.) The magnet wire used in the present invention is made of this suspension. When heating, use a temperature of around 300 to 500°C at which the SiO2/PbO-B2O3-based glass fine powder does not melt, and then apply a heat-resistant paint, such as polyimide 17, which will become an organic insulating layer on top of this, so that the inorganic insulating coating 16 will not melt. It is baked below the temperature range.

Next, in the second embodiment of the present invention, inorganic fine powder such as SiO2/PbO-B2O3 system, SiO2/M
gO・Al.

O. Cr may be added to the inorganic fine powder containing the system, etc., if necessary. A metal oxide such as O, etc. is added to form a fine powder, and an insulating varnish such as organic silicon that serves as a binder is added to the powder. For example, the suspended inorganic substance is applied onto a conductor having a diameter of 0.7 [Mm], and then the suspended inorganic substance is heated at a temperature below the melting point of a so-called blended inorganic substance that is not fired into a glassy state, and then the upper layer is An organic insulator alone or an inorganic insulator such as mica, short glass fiber, SiO. , Al. O
. An electric wire coated with a composition mixed with the above to a thickness of about 10 μm is used together with Büzink. Further, a third embodiment of the present invention uses an electric wire coated with organic silicon or wax, etc. as a mold release agent, between the coating consisting of an inorganic layer and the organic insulating layer in the first or second embodiment. .
The magnet wire manufactured in this way is. The inventor discovered that it has the following excellent properties.

First, this magnet wire has excellent heat resistance because it has a coating formed by heating a suspended inorganic substance, and this suspended inorganic substance layer is completely baked. Because it has not been
By applying pressure under high temperature heating, this suspended inorganic material layer can be moved and scattered.

In addition, electric wires using inorganic insulators are highly flexible and can withstand deformation during viewing.

Next, an electrical connection method called electric welding, or bujinking, will be explained.

Viewing is performed by applying current to the connection part while pressing the wire and the object to be connected with an electrode.The insulating layer of the wire is destroyed by the pressure applied at this time and localized heat caused by the applied current, and becomes the conductor of the wire. The objects to be connected are completely welded and connected.

In FIGS. 2 to 4, 1 and 2 are electrodes for view zinc, 3 is a commutator segment adjacent to the armature of an automobile wiper motor, 4 is a rectifying groove, and 5 is a motor The shaft 6 is a connecting claw of the commutator piece 3 which is another good electrical conductor.

7 is the conductor of the aforementioned magnet wire and also the conductor of the armature winding.

Reference numeral 8 denotes a conductor layer formed on the surface of the commutator piece 3 and made of Zn or Sn plating, which melts at a low temperature.

And A is the view zinc part of the conductor 7 and the connecting claw 6,
This is the part where the conductor 7 and commutator piece 3 are connected by winding a magnet wire under the connecting claw 6 and crushing the connecting claw with an electrode.

FIG. 3 shows a conventional example of the A part, and FIG. 4 shows an inventive example of the A part.

In FIG. 3 showing a conventional example, 7a is an insulating film layer existing on the surface of the conductor 7, and when the inorganic fine powder is fired to a completely glass-like or ceramic-like state as in the conventional case, this hard inorganic layer is removed. is present as the coating layer 7a, causing poor conduction.

In this regard, in FIG. 4 according to the present invention, the inorganic and organic insulating layers were removed by the heat and pressure during Vuzinking, and a good electrical connection was ensured. Note that 9 is a carbide formed by burning polyimide, which becomes the upper organic insulating layer. Note that when the inorganic insulating film and the organic insulating layer are firmly bonded, cracks may not be generated in the organic insulating layer incompletely, or the cracks may be so small that the next step, energization, may not be sufficient. However, in the present invention, as described above, a release agent made of organic silicon or wax is applied between the inorganic insulating film and the organic insulating layer, or an insulating varnish such as organic silicon is used as a binder. The interlayer bonding force between the organic insulating layer and the inorganic insulating coating inside it can be weakened by either using polyimide or the like, which has good surface sliding properties, as the organic insulating layer. Because of this, large cracks will quickly form in each insulating layer due to the pressure during View Zinc, improving the quality of the View Zinc connection.

As described above, the present invention enables high-speed, high-quality electrical connection of magnet wires having an inorganic insulating film with extremely excellent heat resistance, thereby improving the heat resistance characteristics of mass-produced rotating electric machines, etc. Alternatively, it has a significant effect on miniaturization and high output.

centre

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the magnet wire used in the method of the present invention, FIG. 3
The figure is a schematic sectional view of the Beuzink part in the conventional connection method, and FIG. 4 is a schematic sectional view of the Beuzink part in the process shown in FIG. 2. 3... Commutator piece, 6... Other good electrical conductor, e.g. connecting claw, 7... Acting as a conductor, e.g. armature winding conductor, 16... Inorganic insulation coating, 17... Organic insulation layer.

Claims (1)

[Claims] 1. A suspended inorganic substance in which a binder is added to an inorganic fine powder is applied around a conductor, and the inorganic fine powder in the suspended inorganic substance is melted to form a glass-like, ceramic-like, or ceramic-like substance. The suspended inorganic substance is heated to an extent that it does not turn into a similar substance to form a semi-cured film, and then the outer periphery of the film is coated with an organic insulating layer while the bonding force with the film is weak. A heat-resistant insulated wire is formed by covering the heat-resistant insulated wire with another good electrical conductor, and another good electrical conductor is pressed from outside the organic insulating layer of the heat-resistant insulated wire in the direction of the conductor to bond the organic insulating layer and the coating to the other good electrical conductor. and the conductor to cause a crack in the organic insulating layer and separate the coating in the longitudinal direction of the conductor, and then insert the other good electrical conductor into the crack in the organic insulating layer. A heat-resistant insulated wire, characterized in that the wire is brought into contact with the conductor through the separated gap between the coatings, and the contact portion generates heat to weld and connect the other good electrical conductor and the conductor. How to connect. 2. The method for connecting heat-resistant insulated wires according to claim 1, wherein the suspended inorganic substance contains organic silicon and the organic insulating layer is made of polyimide. 3. The heat-resistant insulated wire connection according to claim 1 or 2, characterized by having a release layer between the coating formed by heating the suspended inorganic substance and the organic insulating layer. Method.