JPH07122120A - Self-welding insulated wire and rotary electric machine using this - Google Patents

Abstract

PURPOSE:To realize suitable use for an automobile rotary electric machine requiring heat resistance by winding a self-welding insulated wire made by applying a coating, wherein polyether sulfone, bismaleimide, and one or more kinds selected from a group of polycyanate, aromatic diamine and epoxy compounds are dissolved in an organic solvent, to a conductor directly or via another insulating layer. CONSTITUTION:Coating wherein polyether sulfone, bismaleimide, and one or more kinds selected from a group of polycyanate, aromatic diamine and epoxy compounds are dissolved in an organic solvent is applied to a conductor directly or via another insulating layer and dried. A rotary electric machine 2 is provided with an insulated coil wherein a self-welding insulated wire is wound on a coil core and integratedly heat fused. Another rotary electric machine 2 is directly coupled to a main shaft of an automobile internal combustion engine 1 for conducting electric control and auxiliary acceleration of an automobile, and is provided with an insulated coil wherein a self-welding insulated wire is wound on a coil core and integratedly fused.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-fusing insulated wire having improved heat resistance and a rotating electric machine using the same.

[0002]

2. Description of the Related Art Self-fusing insulated electric wires, which have been conventionally used for coil molded products of various telecommunications equipment, have recently been able to be integrally fixed between wires without varnish impregnation treatment after coil winding. Streamlining the coil forming process of
With the demand for labor saving, the demand is increasing more and more.

This self-bonding insulated wire has a self-bonding layer mainly composed of a thermoplastic resin as the outermost layer of the wire. As the thermoplastic resin, a polyvinyl butyral resin or a copolyamide resin has hitherto been used. , Phenoxy resin, polyvinyl formal resin, polyester resin, epoxy resin and the like have been used.

However, in recent years, there is a demand for using such a self-bonding insulated electric wire as a coil for equipment such as motors and transformers used at high temperatures. However, as described above, the self-fusing insulated electric wire has a drawback that it is inherently poor in heat resistance because the fusion layer is softened and integrated by only heating. That is, in many conventional self-fusing insulated wires, the softening temperature of the fusion layer is as low as about 100 to 150 ° C. Therefore, when the temperature inside the equipment rises, the fusion layer softens and the adhesive strength decreases. Therefore, it was difficult to apply it to applications requiring heat resistance. On the other hand, in order to prevent the decrease of the adhesive force under such a high temperature atmosphere, a product using an aromatic polyester resin in the fusion layer has been developed. However, in order to obtain sufficient adhesive strength after coil forming, this product is 250 ° C.
Since it is necessary to heat at the above high temperature, workability is poor, and there is a risk of deterioration of the main insulating layer.

[0005]

As described above, in recent years, there has been a demand for a self-fusing insulated wire that can be used in a high temperature atmosphere, but most of the conventional ones have a low adhesive strength in a high temperature atmosphere. However, it is difficult to use, and those that prevent the decrease in adhesive strength in such a high temperature atmosphere need to be heated at a high temperature in order to obtain sufficient initial adhesive strength, resulting in a decrease in workability. There is a drawback that the main insulating layer is deteriorated.

The present invention has been made in consideration of such conventional circumstances, and a self-bonding insulated electric wire which can be firmly bonded by heating at a low temperature, and whose adhesive force is maintained even at a high temperature, and An object is to provide a rotating electric machine using the same.

[0007]

The self-bonding insulated electric wire of the present invention is provided on a conductor directly or through another insulating layer.
(A) Polyether sulfone, (b) bismaleimide, and (c) one or more selected from the group consisting of polycyanate, aromatic diamine and epoxy compound are dissolved in an organic solvent, and the coating is dried. It is characterized by

Further, the rotating electric machine of the present invention is characterized in that an insulating coil formed by winding the self-bonding insulated wire on the coil core and integrally heat-sealing the same is provided.

Further, another rotating electric machine according to the present invention is a rotating electric machine which is directly connected to a main shaft of an internal combustion engine of an automobile to perform electric braking and auxiliary acceleration of the automobile, wherein the self-rotating electric machine according to claim 1 is provided on a coil core. It is characterized in that it comprises an insulating coil formed by winding a fusible insulated electric wire and integrally heat-sealing it.

The polyether sulfone which is the component (a) used in the present invention is represented by the following general formula having an average molecular weight of 10,000 or more.

[0011]

[Chemical 1] (However, in the formula, n is a positive integer.) Examples of commercially available products include, for example, Victorex PE manufactured by Mitsui Toatsu Chemicals, Inc.
S, Victrex PES (trade name) manufactured by Sumitomo Chemical Co., Ltd., I.S. C. I's Victrex PES 200P, PES 3
Examples include 00P (above, product name).

The bismaleimide as the component (B) is represented by the following general formula, and among them, those in which x is a -CH ₂ -group are preferable.

[0013]

[Chemical 2] (However, in the formula, x is -O-, -S-, -SO ₂ -or -CH _2- .) Examples of commercially available products include BMI (trade name) manufactured by Mitsui Toatsu Chemicals, Inc. can give.

As the polycyanate of the component (c),
Examples thereof include bisphenol A dicyanate, its trimer, pentamer and heptamer. Of these, bisphenol A diisocyanate is preferable. To exemplify commercial products,
For example, as a mixture with (b) bismaleimide, BT resin (trade name) manufactured by Mitsubishi Gas Chemical Co., Inc. can be mentioned.

As the aromatic diamine, 4,4'-
Diaminodiphenylmethane (DAM), 4,4'-diaminodiphenylpropane, 4,4'-diaminodiphenyl ether, benzidine, 4,4'-diaminodiphenyl sulfide, 3,3'-diaminodiphenyl sulfone, 4,4 '
-Diaminodiphenyl sulfone, m-toluylenediamine, m-phenylenediamine, p-phenylenediamine,
Examples thereof include 2,6-diaminopyridine and bis (4-aminophenyl) diethylsilane. Among them, 4,4′-diaminodiphenylmethane is preferable. To exemplify commercial products,
For example, MDA-220 (trade name) manufactured by Mitsui Toatsu Chemicals, Inc. can be cited.

Further, the epoxy compound is preferably one having at least two epoxy groups in the molecule, and for example, a bisphenol A type epoxy resin or the like is used. Examples of commercially available products include, for example, Epicoat 10 manufactured by Shell Co. as a mixture with (b) bismaleimide.
Examples include 07 (trade name) and Epitote YB-017 (trade name) manufactured by Tohto Kasei.

Polycyanate of these (c) components,
The aromatic diamine and the epoxy compound may be used alone or in combination of two or more.

The above-mentioned components (b) and (c) have the effect of relaxing the heating conditions for fusing. That is,
(A) Only the component has excellent adhesive strength at high temperature,
Fusing requires heating at high temperatures. However,
By blending the components (b) and (c), it becomes possible to perform fusion bonding at a low heating temperature, and further, the adhesive strength at high temperature is not reduced. In addition, the component of (b),
Alternatively, such an effect cannot be obtained simply by blending the component (c) with the component (b) alone.

In order to obtain the above effects, the preferable mixing ratio of each of the components (a) to (c) is 100 parts by weight of the polyether sulfone of the component (a) and the bismaleimide of the component (b) ( The total amount of the component (c), which is one or more selected from the group of polycyanate, aromatic diamine and epoxy compound, is 5 to 300 parts by weight, and the component (b) and the component (c) are The mixing ratio is 50 to 1000 parts by weight per 100 parts by weight of the component (b). More preferably, the total amount of the component (b) and the component (c) is (a).
25 to 200 parts by weight per 100 parts by weight of the component (b), and 60 to 9 parts of the component (c) per 100 parts by weight of the component (b).
It is in the range of 00 parts by weight.

Next, as an organic solvent for dissolving or dispersing each of the above components, phenol-based solvents such as cresol, xylenol and phenol, nitrogen-containing solvents such as N-methyl-2-pyrrolidone, dimethylacetamide (DMAC) and dimethylformamide. Type solvents, ketone type solvents such as cyclohexanone, methyl ethyl ketone, methyl hexanone, acetophenone, methyl carbitol, carbitol, methyl cellosolve acetate, methyl cellosolve,
Examples include alcohol solvents such as isopropyl benzyl alcohol, hydrocarbon solvents such as benzene, xylene, toluene, solvent naphtha, etc. These may be used alone or in combination of two or more. May be used.

In the self-fusing insulated electric wire of the present invention, a coating prepared by dissolving each of the components (a) to (c) in the above organic solvent is applied directly on the conductor or through another insulating layer. ,
Obtained by heating and drying. The heating temperature is 250 ~
A temperature of about 450 ° C is suitable, and the component (b) and the component (c) react with each other to obtain these low molecular weight polymers, and a semi-cured coating film is formed.

When provided via another insulating layer, the other insulating layer is formed by applying a coating material for an insulated wire on a conductor and baking it until it is completely cured. As the insulated wire coating material, one having excellent heat resistance is preferable, and in addition to known coating materials such as formal resin, epoxy urethane resin, polyester resin, polyesterimide resin, polyamideimide resin, and polyimide resin, the above fusion layer formation A paint for use is preferably used.

The self-bonding insulated electric wire of the present invention thus obtained is, after coil forming, at a temperature of about 160 to 240 ° C. (a temperature range of 160 to 200 ° C. is usually sufficient).
The surface is softened by heating for 20 to 30 minutes, and they are fused together with sufficient strength. And, the adhesive strength does not significantly decrease even at high temperature.

As described above, the self-fusing insulated electric wire of the present invention firmly fuses by heating at a relatively low temperature, and, at the same time, retains an excellent adhesive force even at a high temperature, so that heat resistance is required. Applications, such as transformer coils, coils for rotating electrical machines of heat-resistant equipment, etc., applications where extremely severe heat cycles are applied, such as coils for rotating electrical machines for electric braking and auxiliary acceleration of automobiles. It is also applicable to.

[0025]

As described above, in the self-fusing insulated electric wire of the present invention, the fusing layer has at least one selected from the group consisting of polyether sulfone, bismaleimide, polycyanate, aromatic diamine and epoxy compound. Since it is formed by applying and drying a coating material mainly composed of and, it can be fused by heating at a relatively low temperature, and also has excellent adhesive strength at high temperature.

Further, since the rotating electric machine of the present invention uses the above-mentioned self-bonding insulated wire, it is excellent in heat resistance and can be used for electric braking and auxiliary acceleration of a vehicle subjected to a severe heat cycle. As a rotating electric machine of the device to perform,
Can withstand practical use.

[0027]

EXAMPLES Examples of the present invention will be described below. Examples 1 to 12 Kelimide 601 (manufactured by Ciba-Geigy Co., Ltd.) in which Victor resin PES, which is a polyether sulfone, BT resin, which is a mixture of bismaleimide and bisphenol A dicyanate, which is a polycyanate, and bismaleimide and DAM, which is an aromatic diamine, are mixed. A paint prepared by dissolving a trade name) and Epicoat 1007, which is a mixture of bismaleimide and an epoxy compound, in an organic solvent DMAC so as to have the composition shown in Table 1, and a polyesterimide wire (0.3 mmφ Apply polyester imide paint on copper wire to a thickness of 20 μm and bake it) and bake it using a baking machine with a furnace length of 3 m under the conditions of DV value (wire diameter x linear velocity) 18-21 and temperature 320-370 ℃ Then, a self-fusing insulated electric wire having a coating film thickness of 10 μm was obtained.

Then, the adhesive strength of the obtained self-bonding insulated electric wire was measured under normal temperature and high temperature atmospheres. The measurement is
Conducted based on ASTM D-2519, first wrap a self-bonding insulated wire around a mandrel with a diameter of 5 mm to make a helicopter coil with a length of about 70 mm, and make 160 ℃, 180 ℃, 200 ℃, 220 ℃,
For samples that were heated at 240 ° C for 30 minutes each,
A bending test was performed at room temperature under the conditions of a fulcrum distance of 44.4 mm and a speed of 20 mm / min, and the adhesive strength at room temperature under each fusion bonding condition was measured. In addition, the helicor coil created in the same way
For samples that have been heated for 30 minutes at
A bending test was carried out in the temperature atmosphere of ℃, 160 ℃, 180 ℃ under the same conditions as in the case of normal temperature, and the adhesive force in each temperature atmosphere was measured. The results are shown in Table 1.

In the table, Comparative Examples are shown as Comparative Example 1 in which only polyether sulfone is applied and baked on a polyesterimide wire, and Comparative Example 2 is a phenoxy resin coating ISOPOXY 506K (manufactured by Sunshine Schenectady Co., Ltd.). An example of a self-bonding insulated wire that is coated and baked by itself (commercial name), and Comparative Example 3 is a self-bonding that is coated and baked by copolymerized polyamide resin paint TCV-U2 (trade name by Tokushu Paint Co., Ltd.) Polyester resin paint U
-100 (trade name, manufactured by Unitika Ltd.) is an example of a self-bonding insulated electric wire coated and baked alone, and all of them are shown for comparison with the present invention. The adhesive strengths of Comparative Examples 2 to 4 are 180 ° C. for 10 minutes, 180 ° C. for 10 minutes, and 250 ° C., respectively.
It was measured for the one that was heat-fused for 30 minutes.

[0030]

[Table 1] As is clear from Table 1, the self-fusing insulated electric wire of the present invention has a sufficient adhesive force even under a low temperature fusing condition and is also excellent in an adhesive force at a high temperature. . Examples 13 to 24 A 1 mmφ annealed copper wire was coated with a polyimide varnish of the pyrromellitic dianhydride type having a chemical structure represented by the following formula to a thickness of about 5 μm and baked at a temperature of 400 to 450 ° C. By repeating 7 times, the film thickness is about 35μ
m polyimide wire was obtained. Then, each coating material prepared in the above Examples 1 to 12 was applied onto this polyimide wire, and a DV value of 18 to 21 and a temperature of 320 to 370 were applied using a baking machine having a furnace length of 3 m.
The film was baked under the condition of ° C to obtain a self-fusing insulated electric wire having a coating film thickness of 20 µm.

[0031]

[Chemical 3] Examples 25 to 36 On a 1 mmφ soft copper wire, a polyimide varnish of the same kind as that used in Examples 13 to 24 was applied to a thickness of about 5 μm, and 4
After baking at a temperature of 00 to 450 ° C, this coating and baking is repeated 5 times.
It was applied to a thickness of μm and baked to obtain a polyamide-imide overcoated polyimide wire having a film thickness of about 35 μm. Then, each of the paints prepared in Examples 1 to 12 was applied onto this polyamideimide overcoated polyimide wire and baked under the conditions of a DV value of 18 to 21 and a temperature of 320 to 370 ° C using a baking machine with a furnace length of 3 m. Thus, a self-bonding insulated electric wire having a coating film thickness of 20 μm was obtained.

Next, a rotary electric machine was produced using the obtained self-bonding insulated electric wire of each of the above-mentioned examples. That is, on the iron core laminated magnetic steel sheet, wound through a predetermined slot insulation made of aramid paper and polyimide film,
It heated at 230 degreeC for 2 hours, and fused between the wires integrally.

Subsequently, the rotary electric machine thus manufactured was mounted as a rotary electric machine of an electric braking and auxiliary accelerating device for performing electric braking and auxiliary acceleration of the automobile shown in FIG. Here, the electric braking and auxiliary acceleration device will be described. This device, as shown in FIG.
It is composed of a rotating electric machine 2 whose rotor part is directly connected to a secondary battery circuit 3, a control device 4, and a resistor 5,
Excessive electrical energy during braking of the vehicle can be dissipated from the resistor 5 to maintain a high braking force, it can also be operated as an auxiliary drive means at low cost, the energy generated by braking is efficient It has the features that it can be regenerated well, that it can obtain a practical form that effectively produces a large brake torque over a wide range of rotation speeds and over a long period of time. However, on the other hand, in the winding used in the rotating electric machine of this device, abrupt temperature increase and decrease are repeated by repeating braking and acceleration of the automobile,
Since a so-called heat cycle is applied, cracks occur in the insulating coating due to thermal stress and thermal deterioration caused by the difference in the coefficient of thermal expansion between the conductor, the insulating coating, and the iron core, and the electrical insulation deteriorates, causing a short circuit. Easy to burn out. However, the electric braking and auxiliary accelerating device manufactured by using the rotating electric machine described above is sufficiently durable for practical use.

By the way, when the above-mentioned rotating electric machine was incorporated into a simulation device in which the internal combustion engine 1 of FIG. 1 was composed of a motor, and a simulated running test of an automobile was carried out, the following good results were obtained. That is, the AC motor drives the motor at a rotation speed that depends on the frequency of the commercial power supply, and in the power generation mode, power is generated until the temperature of the coil-mounted thermocouple reaches 200 ° C.
After reaching 200 ° C, turn off the power generation mode, cool to room temperature, and repeat power generation again, so that 200 ° C → normal temperature → 2
The 00 ° C heat cycle was repeated at the frequency of the actual automobile heat cycle. In this application, since the rotating electric machine is generally controlled by the inverter, a commutation surge voltage generated by the inverter is added to the normal voltage, which is actually a severer condition for the insulating film. Therefore, in this simulated running test as well, an inverter was used to implement these actual conditions. The result is that no matter what rotating electric machine is used, no abnormality in insulation is observed in this severe operation test, and even in the dielectric breakdown test after the test is completed, the dielectric breakdown voltage is line-to-phase, phase-to-phase,
The voltage to the ground was more than four times the voltage applied during operation.

[0035]

As described above, according to the present invention,
Since it can be fused at a low temperature, it has excellent workability and does not deteriorate the main insulating layer during processing,
In addition, it is possible to provide a self-fusing insulated electric wire that also has excellent adhesive strength at high temperatures. Therefore, it is possible to realize an application requiring heat resistance and heat cycle resistance, for example, a rotating electric machine used for electric braking and auxiliary accelerating devices of automobiles, by using the self-fusing insulated electric wire.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of an electric braking and auxiliary acceleration device for a vehicle using a rotating electric machine of the present invention.

[Explanation of symbols]

 1 ... Internal combustion engine 2 ... Rotating electric machine 3 ... Rechargeable battery circuit 4 ... Control device 5 ... Resistor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masatada Fukushima Inventor Masatada Fukushima 2-1-1, Oda Sakae, Kawasaki-ku, Kanagawa Prefecture Showa Electric Wire & Cable Co., Ltd. (72) Kazuo Shimohira, Sakae Oda, Kawasaki-ku, Kawasaki, Kanagawa Prefecture 1-1-1, Showa Densen Denki Co., Ltd. (72) Inventor Hisasu Mitsui 2-4, Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Toshiba Keihin Office

Claims (3)

[Claims] 1. A material selected from the group consisting of (a) polyether sulfone, (b) bismaleimide, and (c) polycyanate, aromatic diamine and epoxy compound, either directly on a conductor or through another insulating layer. A self-fusing insulated electric wire, characterized in that it is formed by applying a coating material prepared by dissolving one or more of these in an organic solvent and drying. 2. A rotating electric machine comprising an insulating coil formed by winding the self-bonding insulated electric wire according to claim 1 on a coil core and integrally heat-sealing the same. 3. A rotary electric machine that is directly connected to a main shaft of an internal combustion engine of an automobile to perform electric braking and auxiliary acceleration of the automobile, wherein the self-bonding insulated electric wire according to claim 1 is wound around a coil core to be integrated. An electric rotating machine, comprising: an insulating coil formed by heat-sealing.