JPH0745133A - Heat resistant electric cable - Google Patents

Abstract

PURPOSE:To provide a heat resistant electric cable, which is used in a high temperature range of no less than approximately 220 deg.C, and which has excellent flexibility, adhesiveness with a conductor, and insulating characteristic even in the high temperature range. CONSTITUTION:A heat resistant fiber 4, for which a glass yarn 2 and a thermoplastic heat resistant resin yarn 3 are doubled, is wound around a thin conductor 1 and heated and fused. The conductor 1 and the glass yarn 2 are integrated into one.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat resistant wire used in a high temperature range of about 220 ° C. or higher, such as an insulated coil of a fully closed motor.

[0002]

2. Description of the Related Art Generally, the insulation coil of a fully closed motor is
A heat-resistant insulated coil is used because it requires mechanical strength and safety during burnout.

In particular, a heat-resistant insulating coil uses an inorganic fiber winding. Furthermore, the glass-wound electric wire has been subjected to severe processing, and even when a burnout accident occurs, the inorganic glass thread remains, so that it has not been developed into a short-circuit accident and has been widely used until now.

[0004]

However, in the above-mentioned wire wound with glass thread, although the glass thread itself is an inorganic material and excellent in heat resistance, the purpose is usually to improve insulation and prevent fraying and fuzzing of the glass thread. Since a coating film is formed by coating an organic substance such as an alkyd-modified varnish between the glass thread and the glass thread, it is conventionally about 1
It is used for wire-wound coils of electric equipment with heat resistance of about 80 ° C.

On the other hand, in the above-described glass thread wound electric wire, the organic solvent is evaporated during production to pollute the air in order to obtain a coating film for preventing the glass thread from fraying and fuzzing.

That is, since the content of the resin contained in the varnish as an active ingredient for forming a coating film is small, the thickness of the coating film formed by one coating is extremely thin and the predetermined coating film strength is high. In order to obtain good quality, it is necessary to repeat the application a plurality of times, and the loss of the solvent is extremely large. Moreover, they are a source of air pollution and may cause pollution problems.

On the other hand, recently, the insulating coil used in a motor for driving a vehicle and an electric motor for oil drilling is
It is a heat-resistant electric wire used in a high temperature range of about 220 ° C. or higher, and a so-called large-capacity heat-resistant electric wire having a large current capacity is desired for a vehicle driving electric motor, an oil drilling electric motor, and the like.

The present invention has been made in view of the above-mentioned circumstances, and provides a heat-resistant electric wire which is excellent in flexibility, adhesion to a conductor, and insulation characteristics even in a high temperature range of about 220 ° C. or higher. The purpose is to

[0009]

SUMMARY OF THE INVENTION According to the present invention, a heat-resistant fiber obtained by winding a glass thread and a thermoplastic heat-resistant resin thread around an elongated conductor is wound and heat-fused to form the conductor and the glass thread. Are integrated.

[0010]

According to the present invention, the conductor and the glass yarn are integrally formed by winding the heat-resistant fiber obtained by mixing the glass yarn and the thermoplastic heat-resistant resin yarn around the conductor and heating and fusing in a heating furnace. And about 2
A so-called large-capacity heat-resistant wire with a large current capacity such as a motor for driving a vehicle or a motor for oil drilling, which is a heat-resistant wire with good flexibility, adhesion to conductors, and good insulation properties in a high temperature range of 20 ° C or higher. Is used as.

[0011]

The present invention will now be described with reference to the illustrated embodiments.

In FIGS. 1 and 2, reference numeral 1 is a linear elongated conductor, and a glass thread 2 is attached to the conductor 1.
And a heat-resistant fiber 4 obtained by combining a thermoplastic heat-resistant resin thread 3 are wound in a single or double manner, and the conductor 1 wound with the heat-resistant fiber 4 is heated in a heating furnace 5 at about 350 ° C. The conductor 1 and the glass thread 2 are integrally formed by heating and fusion at a high temperature.

That is, as shown in FIGS. 1 and 2, the glass yarn 2 is generally ECD450-1 / 0 defined in JIS R3413, for example. or,
The thermoplastic heat-resistant resin yarn 3 is made of a thermoplastic polyamide resin, such as Aurum fiber or polyether ether ketone (hereinafter PEEK) manufactured by Mitsui Toatsu Kagaku Co., Ltd.
(Also referred to as resin), and the thickness of the heat resistant resin thread 3 is about 30 to 100 μm, and the heat resistant resin thread 3 having this thickness is used.

Therefore, as shown in FIG. 2, a heat-resistant fiber 4 obtained by combining the glass yarn 2 and the thermoplastic heat-resistant resin yarn 3 is single or doubled on the conductor 1 being transferred. The conductor 1 wound with the heat-resistant fiber 4 is heated and fused at a high temperature of about 350 ° C. in the heating furnace 5. Then, while the heat-resistant fiber 4 is in a molten state, it is preformed by a pair of upper and lower forming rolls 6 with a constant pressure in the longitudinal direction of the conductor 1 so that the outer shape of the heat-resistant fiber 4 has a predetermined size. And is wound on the winding frame body 7.

Next, description will be given with reference to the examples in Table 1.

In the example and the comparative example of the single fiber winding, the size of the conductor 1 is 2,0 × 5,0 mm, the thickness of the heat resistant resin thread 3 is 60 μm, and the structure and characteristics are commonly used. Is shown in Table 1.

Here, if the volume ratio (ratio) of the heat resistant resin yarn 3 is small, the space between the wound glass yarn 2 and the glass yarn 2 is not filled with the molten resin, and the glass yarn 2 is not filled.
The effect of fraying and fuzzing cannot be obtained.

On the other hand, when the volume ratio (ratio) of the heat-resistant resin yarn 3 is large, the insulating effect of the glass yarn 2 is reduced and the cost is increased in the case of a burnout accident.

In the present invention, the volume ratio (ratio) of the heat resistant resin yarn 3 is preferably 1: 1 in consideration of the balance among insulation performance, workability and cost.

Further, according to the experiment, as is clear from Table 1 below, glass yarn: polyamide resin yarn is 1.0:
0.8, glass yarn: polyamide resin yarn 1.0: 1.
The ratios of 0, glass yarn: polyamide resin 1.0: 2.0 and glass yarn: PEEK resin yarn 1.0: 1.0 are favorable.

[0021]

[Table 1] The table which showed the characteristic relationship with the volume ratio of glass threads etc. as heat resistant resin threads, and a conductor.

[0022]

As described above, according to the present invention, a heat-resistant fiber obtained by compounding a glass thread and a thermoplastic heat-resistant resin thread is wound around an elongated conductor and heat-bonded to the conductor and the glass thread. And the heat-resistant fiber layer formed on the conductor have the same electrical insulation and mechanical strength characteristics that are characteristic of the fiber winding. Since it is a composite of the above-mentioned thermoplastic resin threads, it has excellent flexibility as an electric wire, and has flexibility and adhesion to a conductor and good insulating properties even in a high temperature range of about 220 ° C or higher, Since no varnish for forming a coating film is used, there is an excellent effect such that there is no fear of pollution due to air pollution due to evaporation of the solvent.

[Brief description of drawings]

FIG. 1 is a side view of a heat resistant electric wire of the present invention.

FIG. 2 is a diagram for explaining a manufacturing process of the heat resistant electric wire of the present invention.

[Explanation of symbols]

 1 conductor 2 glass thread 3 heat resistant resin thread 4 heat resistant fiber 5 heating furnace 6 forming roll 7 winding frame

Claims (3)

[Claims] 1. A conductor and glass yarn are integrated with each other by winding a heat-resistant fiber obtained by mixing a glass yarn and a thermoplastic heat-resistant resin yarn around an elongated conductor and heating and fusing them. Heat resistant electric wire. 2. A conductor is wound around a heat-resistant resin yarn, the heat-resistant fiber being one of thermoplastic polyimide resin and polyether ether ketone resin.
Heat resistant electric wire as described. 3. The heat-resistant resin yarn is a heat-resistant fiber obtained by combining a glass yarn with a volume ratio of about 0.8 to 2.0 with respect to a volume of 1.0, and is wound around a conductor. The heat resistant electric wire according to claim 1.