JPS6135668B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the connection of an insulated wire having a novel ceramicizable insulating film to other metals, which has been invented in recent years, and particularly relates to the connection to commutator pieces in rotating electric machines, etc. It is something.

Insulated wires conventionally used in electrical and electronic equipment are
The electric current that is passed to generate the magnetic field generates so-called Joule heat, resulting in high temperatures, so heat resistance is required so that the insulating film does not easily deform or easily deteriorate due to heat. For this reason, many heat-resistant polymer materials have been used as coatings on insulated wires, which has made devices smaller, reduced short-circuit accidents, and further improved device reliability. As can be seen from these facts, improving the heat resistance of insulated wire coatings has long been a very important technological development theme.

In recent years, stationary coils and moving coils of motors, etc., which are used in special high-temperature atmospheres, especially in automobile electrical components and chemical plants, are required to operate normally even under severe conditions of previously unimaginable high-temperature atmospheres. It's starting to happen. In other words, even if an abnormal overload current flows, such as in a high-temperature atmosphere accompanied by mechanical vibrations, short-circuit accidents between the insulated wires that form the coil will not occur, and the magnetic field generation function of the coil will be maintained. It has been requested.

Most of the coatings on insulated wires used in conventional coils were made of organic polymers, which softened as the temperature rose and decomposed as the temperature rose further, resulting in a gradual decline in insulation function. For this reason, coils that require particularly high heat resistance have been made with conductors coated or coated with inorganic materials. This type of inorganic material insulated wire has very poor film flexibility. For this reason, it is used only in motors for large electrical equipment that do not require much flexibility, such as marine motors, vehicle motors, or large generators, and has not been used in coils for small, high-performance equipment that require flexibility. Ta.

In general, inorganic insulated wires include, for example, insulated wires insulated with a metal oxide film such as alumina insulated wires made by anodizing aluminum, insulated wires horizontally wound with inorganic fibers such as glass fibers and asbestos fibers, and asbestos tapes. , insulated wires in which inorganic tapes such as mica-containing tapes are wrapped horizontally, and insulated wires in which metal oxides such as aluminum oxide and magnesium oxide or glass powder are mixed into organic insulators have been developed, and some of them have been put into practical use. ing.

However, insulated wires insulated with a metal oxide film, such as alumina insulated wires, have poor flexibility, so unless they are wound to a very large diameter, the film will crack and the insulation properties will not be satisfactory. I can't get it. For this reason, although it has been put to practical use in special applications such as large lifting magnets, it cannot be used at all for small and medium-sized rotating machines equipped with so-called automatic winding machines.

Next, insulated wires made by horizontally wrapping inorganic fibers such as glass fibers and asbestos fibers, insulated wires made by horizontally wrapping inorganic tapes such as asbestos tape, tape containing mica, etc., of course depend on the outer diameter of the fibers used, the tape Due to limitations such as the thickness of the insulated wire, the thickness of the insulating film becomes thicker and the outer diameter of the insulated wire becomes larger. For this reason, when incorporated into a device, the space factor of the conductor is poor, leading to a decrease in the efficiency of the device, and in order to fully utilize the efficiency, the device must be made larger. Furthermore, these inorganic fibers have poor mechanical strength against abrasion, scratches, etc., and must be handled carefully to avoid deterioration of their insulation properties, making it difficult to expect an improvement in the productivity of equipment. This type of insulated wire is used for marine equipment, large generators,
They are only used in some equipment that is not mass-produced, such as train motors.

On the other hand, in the case of an insulating film in which metal oxide powder, glass powder, etc. are mixed into an organic insulator, the various drawbacks mentioned above can be improved and a preferable insulated wire can be obtained. Insulated wires made by mixing metal oxide powder, glass powder, etc. into organic insulators have long been used as honeycomb wires. However, if a metal oxide is simply mixed into an organic material in this way, for example, in the unlikely event that an overcurrent flows through the coil and the organic material is thermally decomposed, the metal oxide powder itself will not have the ability to form a film. Therefore, it is lost due to the lack of organic film. This tendency is particularly noticeable when vibrations are applied to the equipment. Therefore, mixing and using such metal oxide powder as an organic material cannot improve the heat resistance of the organic material.

In such situations, thin film insulation is possible, forming an insulating film that is highly flexible and can withstand automatic coil winding, and the film will not break even if the electrical/electronic equipment is overloaded and an excessive current is applied. Insulated wires have been developed in recent years. More specifically, if an overcurrent is applied and the temperature reaches such a temperature that the organic material thermally decomposes, the entire structure turns into ceramic while the film is still formed. In other words, an insulating paint mainly composed of inorganic materials and silicone is applied and baked on the conductor, and if necessary, a normal organic insulating paint is applied and baked on the insulating film. can be used,
Furthermore, in the event of abnormal high temperatures, a ceramic insulating layer is formed to enable normal operation of the equipment under high temperatures. Examples of the silicone resin include methyl silicone resin, phenyl silicone resin, methyl phenyl silicone resin, methylbenzyl silicone resin, and organically modified silicone resins, and a plurality of these resins may be used in combination. Examples of inorganic materials include mica, alumina, silica, clay, carrion, bentonite, montmorillonite, glass, flint, silicon nitride, boron nitride, barium titanate,
Examples include calcium titanate, lead titanate, zircon, barium zirconate, steatite, beryllia, zirconia, mamanesia, etc., and mixtures thereof. If necessary, add about 20 to 200 parts by weight of an inorganic material to 100 parts by weight of silicone resin, and if necessary, add a diluent to make a paint material.By applying and baking it onto a conductor, an insulated wire that can be made into ceramic can be made. can.

This insulated wire gradually becomes ceramic as the silicone resin and inorganic material interact with each other due to heat generated in a high temperature atmosphere or when an overcurrent flows through the conductor, and after it becomes ceramic, it loses its flexibility. It is a hard insulator.

When using insulated wires that can be made into ceramic with these characteristics in rotating electric machines, etc., and connecting them to commutator bars after coil processing, the electrical fusing method that has been used in the past can be used to insulate the wires by heating during fusing. The film remained in a ceramic state, resulting in poor connection due to so-called high contact resistance. If such a defective connection product is used, heat cycles will be added to the connection part due to repeated operation of the equipment, and an insulating or semi-electric oxide film will grow on the connection metal part. As a result, the contact resistance of this connection part will increase, for example. What was initially 1mΩ could rise to 100mΩ by two orders of magnitude, and this had become an important technical problem that needed to be solved.

We have completed the present invention as a result of intensive research and development to completely eliminate this connection failure. The present invention will be explained in detail below. In the present invention, when connecting an insulated wire that can be made into ceramic to another metal, the insulating film at the connection part is cauterized by laser beam irradiation, and then the connection part of the electric conductor is heated, and the insulated wire is pressed against the conductor of the insulated wire. The base is welded and connected. If there is a risk that the insulating film cauterized by laser beam irradiation may remain on the conductor during the process of welding and connecting, the remaining cauterized insulating film can be more reliably removed by blowing gas at the same time as or after the laser beam irradiation.

The laser beam used in the present invention may be any type of laser beam that can cauterize the ceramicizable insulation coating. As the gas laser, a carbon dioxide laser, an argon laser, a krypton laser, etc. can be used. As solid-state lasers, ruby lasers, glass lasers, YAG lasers, etc. can be used. Other semiconductor lasers that can be used include gallium arsenide laser, indium arsenide laser, and indium antimony laser. However, a carbon dioxide laser beam, which has already been widely used and has many achievements, is sufficient. The output and irradiation time of the laser beam will vary somewhat depending on the characteristics of the insulation film itself, the wire size, and the thickness of the insulated wire, but in most cases the output is 10W to 100W, and the irradiation time is extremely short, about 0.5 to 5 seconds. It was confirmed through experiments that irradiation was sufficient. If the output exceeds this range and the irradiation time is short, the insulating film may not be cauterized and the purpose may not be achieved. On the other hand, if the output exceeds 100W, the irradiation time must be significantly shortened, and even a slight increase in irradiation time can cause changes in the conductor crystal structure, sometimes creating holes. Care must be taken as changes in the conductor crystal structure can cause problems such as wire breakage due to the pressing force during fusing or the stress generated during equipment operation. The present inventors have experimentally determined that the irradiation conditions for the laser beam used to cauterize the insulation film are as follows:
It has been found that a 100W irradiation time of 0.5 to 5 seconds is a favorable condition that allows stable control and does not cause any change in the crystal structure of the conductor.

On the other hand, in the present invention, gases such as air, nitrogen, and other inert gases can be used to more reliably remove the cauterized insulation film that remains by spraying the laser beam on the ceramicizable insulation at the same time as or after the laser beam is irradiated. Considering this, air is sufficient. In particular, when it is desired to prevent oxidation of the insulated conductor of the connection part and the electrical conductor of the connected part, it is preferable to use nitrogen gas.

Conventional energization methods can be used to heat the connection portion of the electrical conductor of the present invention. Alternatively, a method using laser beam irradiation can also be used.
There is no particular limitation on the type of laser beam used at this time, as long as it can heat the connection portion of the electric conductor. As mentioned above, gas lasers, solid-state lasers,
Those specifically listed as semiconductor lasers can be used. In particular, when heated by laser beam irradiation, the electrical conductor instantaneously reaches a high temperature, and the adhesive strength at the connection point was surprisingly 1.5 to 2.5 times higher than when using electricity. This means that reliability is greatly improved, especially in connection with parts such as rotating electric machines that are subject to centrifugal force. It is effective for large motors that are subject to particularly large centrifugal forces during rotation, and has great industrial value. When heating by irradiating this laser beam, the electric conductor instantly becomes high temperature, so there is an advantage that there is no need to provide a conductor layer made of Zn or Sn plating that melts at low temperatures on the surface of the commutator piece. will be added.

Next, the present invention will be explained using the drawings. FIG. 1 shows the connection of ceramicizable insulated wires to commutator bars in a rotating machine. Reference numerals 1 and 2 are electrodes for electrical heating, 3 is a commutator segment adjacent to the armature of the motor, and 4 is a rectifying groove. 5 is the shaft of the motor, and 6 is a connecting claw of the commutator piece 3 which serves as another electric conductor. 7 is an insulated wire according to the present invention, which is an armature winding. 8 is Zn and Sn provided on the surface of the commutator piece
A conductor layer made of plating or the like that melts at low temperatures. Reference numeral 10 denotes a laser beam irradiation jig, which is a nozzle that also has a gas injection function in some cases. A is an insulated wire 7 that can be made of ceramic and a connecting claw 6
An insulated wire is hooked under the connecting claw 6, and a laser beam is irradiated from the laser beam irradiation jig 10.

However, the procedure of hooking an insulated wire under the connecting claw and irradiating the laser beam to cauterize the film may be carried out using two or three different procedures, such as the following.

That is, the method involves hooking the insulated wires to each connecting claw of the commutator and cauterizing the coating by irradiating the laser beam one by one, winding a coil for one rotating machine, and hooking it to the claws of the commutator. After completion, the coating is cauterized by irradiating each hooked part with a laser beam sequentially or simultaneously, or by irradiating the laser beam from all sides to cauterize the coating immediately before hooking it to the individual connecting claws of the commutator. This method involves winding the parts one after another so that they are right at the connecting claws.

By injecting gas at the same time as the laser beam irradiation or after the irradiation, the remaining cautery insulation film can be removed more reliably. Then, a current is passed between the electrodes 1 and 2 to generate heat in the connecting claw 6, and at the same time press it with the electrode 1, so that the low melting point metal, the connecting claw, and the conductor of the insulated wire are welded, and the commutator pieces are connected. be.

FIG. 2 shows the connection when the fuse is made by the conventional method without laser beam irradiation. Reference numeral 7a denotes an insulating ceramic coating layer remaining on the surface of the ceramicizable insulating conductor 7b, which causes an increase in connection resistance.
FIG. 3 shows the connection portion when fusing is performed after laser beam irradiation according to the present invention. The connection was made reliably without contaminating any residue of the insulating coating.

The following will be explained using comparative examples, reference examples, and examples. Ceramic insulated wires have a common size
The diameter is 0.7 mm, and the film thickness is 27 μm. The number of connections is 10,000 in each example. The adhesive strength of the connection was measured at room temperature by pulling the insulated wire in the connection direction and applying the maximum tensile load.

In the comparative example, an insulated wire that can be made into ceramic was connected to the commutator part using the same electrical fusing method using current heating without using a laser beam, and 0.20% of connection failures with a connection resistance of 10 mΩ or more occurred. . The adhesive force at the connection portion was 3 to 5 kgf.

Reference Examples 1 to 4 are those in which a film of an insulated wire that can be made into ceramic is cauterized by irradiation with a gas laser beam, and then connected to a commutator part by an electrical fusing method using current heating as in the conventional method. The irradiation conditions of the carbon dioxide laser beam are outside the appropriate range according to the present invention. Contact resistance is 10mΩ
Although the above connection failures occur at 0.01 to 0.07%, they are significantly reduced to 1/3 to 1/20 compared to the comparative example, and the effect of the insulating film that can be made into ceramic by laser beams is It was clearly recognized. In Reference Examples 3 and 4, the laser beam irradiation conditions were out of the appropriate range and were very strong, so the crystal structure of the copper body of the ceramic insulated wire changed and became brittle, resulting in the adhesive strength at the connection part becoming 2 to 3 kgf. This is about 1/2 compared to the comparative example.

In Examples 1 to 4, the irradiation conditions when cauterizing the ceramicizable insulating film with the carbon dioxide laser field fell within the appropriate range according to the present invention. Connection failure with contact resistance of 10mΩ or more is 0.01~
It was 0.02%, which was significantly reduced by 1/10 to 1/20 compared to the comparative example. The effect of cauterization was noticeable. Concomitantly, the adhesive force at the connection portion was surprisingly 1.5 to 2.5 times higher than that of the comparative example, at 4 to 14 kgf. In Example 3, in particular, the connection claws were heated by irradiation with a laser beam and simultaneously pressed with a jig to connect them. In this case, the adhesive strength of the connection is 11
~14Kgf. This is clearly about twice as high as the adhesive strength of Examples 1, 2, and 4, which are 4 to 8 Kgf, which are connected to the commutator part by an electrical fusing method using energized heating.
The effect of heating and pressing connection using laser beam irradiation was clearly recognized. In Examples 5 to 8, the irradiation conditions when cauterizing the ceramicizable insulating film with the carbon dioxide laser beam were within the appropriate range according to the present invention, and the cauterization was performed by jetting air at high speed at the same time as the carbon dioxide laser beam irradiation. The insulating film is dispersed more reliably. In this case, no connection failure with a contact resistance of 10 mΩ or more occurred. On the other hand, the adhesive force at the connection portion was 4 to 14 Kgf, which was actually 1.5 to 2.5 times higher than that of the previous example. Example 7
Specifically, the connection is made by irradiating a laser beam to heat the connecting claw and simultaneously pressing it with a jig. In this case, the adhesive strength of the connection portion was 11 to 14 kgf.
This is clearly about twice as high as the adhesive strength of Examples 5, 6, and 8, which are 4 to 8 Kgf, which are connected to the commutator part by the electrical fusing method using current heating, and the value is clearly about twice as high as that of Examples 5, 6, and 8, which are connected to the commutator part by an electrical fusing method using electrical heating. The effectiveness of the heat-press connection was clearly recognized.

Comparative example: Insulating paint consisting of silicone resin and mica fine powder was applied and baked on a 0.7mmφ copper wire to form a film with a thickness of 27μ.
This is an insulated wire that can be made into ceramic. This wire was wrapped around the motor rotor and then connected to the commutator section using an electrical hook. In this case, connection failure with contact resistance of 10 mΩ or more is 0.20%.
Occurred. The adhesive force at the connection portion was 3 to 5 kgf.

Reference example 1 An insulating paint consisting of silicone resin and fine alumina powder is applied to a 0.7mmφ copper wire and baked to obtain a coating thickness of 27μ.
This is an insulated wire that can be made into a semi-conductor. After wrapping this wire around the motor rotor, the part where it was wrapped around the connecting claw was irradiated with a carbon dioxide laser with an output of 7W for 5 seconds. Although the insulating film was only slightly cauterized, electrical fusing was subsequently performed to connect it to the commutator. In this case, the contact resistance is 10
Connection failures of mΩ or more occurred in 0.07%. The adhesive force at the connection portion was 3 to 7 kgf.

Reference example 2 An insulating paint consisting of silicone resin and fine alumina powder was applied to a 0.7mmφ copper wire and baked to form a film with a thickness of 27 mm.
This is an insulated wire that can be made into μm ceramic. After wrapping this wire around the rotation of the motor, a carbon dioxide laser with an output of 50W was irradiated for 0.2 seconds on the connection claw and the part to cauterize the insulation film. Next, I connected it electrically to the commutator part as fusing. In this case, a connection failure with a contact resistance of 10mΩ or more
Occurred at 0.06%. The adhesive force at the connection portion was 3 to 7 kgf.

Example 1 An insulating paint consisting of a silicone resin, mica fine powder, and kaolin fine powder was applied and baked on a 0.7 mmφ copper wire to obtain an insulated wire having a coating thickness of 27 μm and capable of being made into ceramic. After wrapping this wire around the motor rotor, the part where it was wrapped around the connecting claw was irradiated with a carbon dioxide laser with an output of 12 W for 5 seconds to cauterize the insulating film. Next, I connected it to the commutator part by fusing it electrically. In this case, connection failures with contact resistance of 10 mΩ or more occurred in 0.01%. The adhesive strength of the connection part is 4~
It was 8kgf.

Example 2 An insulating paint consisting of a silicone resin, mica fine powder, and kaolin fine powder was applied and baked on a 0.7 mmφ copper wire to obtain an insulated wire having a coating thickness of 27 μm and capable of being made into ceramic. After wrapping this wire around the motor rotor, the part where it was wrapped around the connecting claw was irradiated with a 50W carbon dioxide laser for 2 seconds to cauterize the insulation film. Next, I connected it to the commutator part by fusing it electrically. In this case, connection failures with contact resistance of 10 mΩ or more occurred in 0.01%. The adhesive force at the connection portion was 4 to 8 kgf.

Example 3 An insulating paint consisting of a silicone resin, mica fine powder, and kaolin fine powder was applied and baked on a 0.7 mmφ copper wire to obtain an insulated wire having a coating thickness of 27 μm and capable of being made into ceramic. After wrapping this wire around the motor rotor, the part where it was wrapped around the connecting claw was irradiated with a 50W carbon dioxide laser for 2 seconds to cauterize the insulation film. Next, a carbon dioxide gas laser with an output of 120 W was irradiated onto the connection claw for 2 seconds to heat it, and at the same time, the connection was made by pressing with a jig. In this case, a connection failure with a contact resistance of 10mΩ or more
Occurred at 0.01%. The adhesive force at the connection portion was 11 to 14 kgf.

Example 4 An insulating paint consisting of a silicone resin, mica fine powder, and kaolin fine powder was applied and baked on a 0.7 mm diameter copper wire to obtain an insulated wire having a coating thickness of 27 μm and capable of being made into ceramic. After wrapping this wire around the rotor of the motor, a carbon dioxide gas laser with an output of 90 W was irradiated for 0.8 seconds at the part where the connecting claw was hooked to cauterize the insulating film. Next, I connected it to the commutator section by fusing it electrically. In this case, connection failures with contact resistance of 10 mΩ or more occurred in 0.02%. The adhesive strength of the connection part is 4
It was ~8Kgf.

Reference Example 3 An insulating paint consisting of a silicone resin, fine mica powder, and fine carrion powder was applied and baked on a 0.7 mm diameter copper wire to obtain an insulated wire with a coating thickness of 27 μm that could be made into ceramic. After wrapping this wire around the motor rotor, the part where it was wrapped around the connecting claw was irradiated with a 90W carbon dioxide laser for 7 seconds to cauterize the insulation film. Next, I connected it to the commutator part by fusing it electrically. In this case, connection failures with contact resistance of 10 mΩ or more occurred in 0.01%. The adhesive strength of the connection part is 2
It was ~3Kgf.

Reference Example 4 An insulating paint consisting of a silicone resin, mica fine powder, and kaolin fine powder was applied and baked on a 0.7 mmφ copper wire to obtain an insulated wire with a coating thickness of 27 μm that can be made into ceramic. After wrapping this wire around the motor rotor, the part where it was wrapped around the connecting claw was irradiated with a 120W carbon dioxide laser for 1 second to cauterize the insulation film. Next, I connected it to the commuter section by fusing it electrically. In this case, connection failures with contact resistance of 10 mΩ or more occurred in 0.02%. The adhesive strength of the connection part is 2~
It was 3kgf.

Example 5 An insulating paint consisting of a silicone resin, fine alumina powder, and fine mica powder was applied and baked on a 0.7 mmφ copper wire to obtain an insulated wire with a coating thickness of 27 μm that can be made into ceramic. After wrapping this wire around the rotor of the motor, a carbon dioxide laser with an output of 12W was irradiated for 5 seconds on the part where it was wrapped around the connecting claw, and at the same time air was jetted at high speed to cauterize and scatter the insulating film. Next, I connected it to the commutator part by fusing it electrically. In this case, no connection failure with a contact resistance of 10 mΩ or more occurred. The adhesive strength of the connection part is 4
It was ~8Kgf.

Example 6 An insulating paint consisting of a silicone resin, fine alumina powder, and fine mica powder was coated and baked on a 0.7 mm diameter copper wire to produce an insulated wire with a coating thickness of 27 μm that can be made into ceramic. After wrapping this wire around the rotor of the motor, the part where it was wrapped around the connecting claw was irradiated with a carbon dioxide soser with an output of 50 W for 2 seconds, and at the same time air was jetted at high speed to cauterize and scatter the insulating film. Next, I connected it to the commutator part by fusing it electrically. In this case, no connection failure with a contact resistance of 10 mΩ or more occurred. The adhesive strength of the connection part is 4 to 8
It was Kgf.

Example 7 An insulating paint consisting of silicone resin, fine alumina powder, and fine mica powder was applied and baked on a 0.7 mmφ copper wire to obtain an insulated wire with a coating thickness of 27 μm that can be made into ceramic. After wrapping this wire around the rotor of the motor, a carbon dioxide laser with an output of 50W was irradiated for 2 seconds on the part where it was wrapped around the connecting claw, and at the same time air was jetted at high speed to cauterize and scatter the insulating film. Next, a carbon dioxide laser with an output of 120 W was used to irradiate the connecting claw for 2 seconds to heat it up, and at the same time press it with a jig to connect. In this case, no connection failure with a contact resistance of 10 mΩ or more occurred. The adhesive force at the connection portion was 11 to 14 kgf.

Example 8 An insulating paint consisting of a silicone resin, fine alumina powder, and fine mica powder was applied and baked on a 0.7 mm diameter copper wire to obtain an insulated wire with a coating thickness of 27 μm that can be made into ceramic. This wire was wrapped around the rotor of the motor, and then the part connected to the connecting claw was irradiated with a 90W carbon dioxide laser for 0.8 seconds, simultaneously blowing air at high speed to cauterize and scatter the insulating film. Next, I connected it to the commutator part by fusing it electrically. In this case, no connection failure with a contact resistance of 10 mΩ or more occurred. The adhesive force at the connection portion was 4 to 8 kgf.

[Brief explanation of the drawing]

Fig. 1 is a schematic block diagram showing the process of connecting the commutator part of a wiper motor according to an embodiment of the method of the present invention, Fig. 2 is a schematic cross-sectional view of the fusing part in the conventional connection method, and Fig. 3 1A and 1B illustrate schematic cross-sectional views of the fusing portion according to the present invention in the steps illustrated in FIG. 1, respectively. 1, 2... Electrode for applying current, 3... Commutator piece adjacent to the armature of the motor, 4... Commutator, 5
. . . Shaft of motor, 6 . . . Connection claw serving as another electric conductor, 7 . . . Insulated wire, 7a .
...A conductor layer that melts at low temperature and is made of Zn, Sn plating, etc. and is provided on the surface of a commutator piece, 10...
Laser beam irradiation tool and gas injection nozzle, A... Fusing part of insulated wire and connecting claw.

Claims (1)

[Claims] 1. When connecting an insulated wire that can be made into ceramic to another electrical conductor, the connecting portion of the insulated wire is irradiated with a laser beam to cauterize the insulating film, and then the connecting portion of the electrical conductor is heated. . A method for connecting an insulated wire capable of being made into ceramic, which comprises pressing the insulated wire to weld and connect it to a conductor of the insulated wire. 2. The method for connecting insulated wires capable of being made into ceramic according to claim 1, characterized in that electrical heating is used to heat the connecting portion of the electric conductor. 3. A method for connecting insulated wires capable of being made into ceramic according to claim 1, characterized in that heating the connecting portion of the electric conductor is performed by irradiating a laser beam. 4 Laser beam irradiation conditions are output 10-100W,
A method for connecting insulated wires capable of being made into ceramic according to claim 1, wherein the irradiation time is 0.5 to 5 seconds. 5. The ceramicizable insulated wire of claim 1, wherein the ceramicizable insulated wire constitutes an armature winding of a rotating electrical machine, and the other electrical conductor is a commutator piece of the rotating electrical machine. Connection method. 6 When connecting an insulated wire that can be made into ceramic to another electrical conductor, the connecting portion of the insulated wire is irradiated with a laser beam to cauterize the insulating film, and at the same time or afterwards, a gas is injected to remove the insulating film and then the electrical conductor is connected. 1. A method for connecting an insulated wire that can be made into ceramic, the method comprising heating the connecting portion of the insulated wire and pressing it against the insulated wire to weld and connect it to the conductor of the insulated wire. 7. The method for connecting ceramicizable insulated wires according to claim 6, characterized in that electrical heating is used to heat the connection portion of the electric conductor. 8. The method for connecting insulated wires capable of being made into ceramic according to claim 6, characterized in that the heating of the connection portion of the electric conductor is performed by irradiation with a laser beam. 9 Laser beam irradiation conditions are output 10-100W,
7. The method of connecting insulated wires capable of being made into ceramic according to claim 6, wherein the irradiation time is 0.5 to 5 seconds. 10. The ceramicizable insulated wire of claim 6, characterized in that the ceramicizable insulated wire constitutes an armature winding of a rotating electric machine, and the other electrical conductor consists of a commutator piece of the rotating electrical machine. Connection method.