TWI529749B - A electric insulating wire of a multilayer coating layers - Google Patents

Description

Multi-layer coated electric insulated wire

The present invention relates to a multilayer insulated electric insulated wire.

A solar car of an electric motor vehicle using a solar battery as a power source converts light energy from the sun into electric energy by a solar cell, and then inputs the electric energy into an electric motor as a power to rotate the tire to travel. In an electric motor (electric motor) of a solar vehicle of such an electric vehicle, in order to maximize the use of electric power of the solar battery, it is required to have a light and efficient electric motor.

An electric motor is an electric device that converts electric energy into mechanical energy, and is a rotor, a stator that generates a rotational momentum by interacting with a rotor, a rotating shaft that transmits rotation of the rotor to the outside, and a supporting rotating shaft. The bearing and the cooling device for cooling the heat generated by the heat loss are constituted.

Although there are various types of electric motors, basically, the insulating coil is wound around the stator, and the current that the coil changes is supplied to cause a change in the magnetic field due to the above-mentioned use. The coil is bound to carry heat and must be dissipated. Furthermore, the motor efficiency (force rate) is also required to be excellent.

The force rate is a ratio of apparent power to effective power, and is a ratio indicating a difference in phase difference between voltage and current. The electric motor (motor) of the solar electric vehicle described above is used as a start, and a coil is used. The reactor of the passive component (in order to alleviate the high-modulation generated by the capacitor, and to set the inrush current input to the phase-in capacitor), etc., almost all have to be coiled The "delay force rate" state in which the current is delayed more than the voltage is formed, and in the state where the current is more delayed than the voltage, the "effective power" actually used by the load, and only the load and the power source are reciprocated without being consumed. The "invalid power" will be generated. The power including the power lost due to the above-mentioned delay force rate is called apparent power, and the apparent power is the external power that includes the effective power and the reactive power, and if the power is high, It is possible to know the effective power that is effectively consumed, and the ineffective power that is not consumed.

When an electric appliance such as an electric heater is used, since the power is completely converted into heat energy, the reactive power does not exist, the force rate is 1, and the delay of the force rate does not occur at all. Therefore, in the case where the power is all effectively digested, the force rate (motor efficiency) is 1, which also means the highest efficiency.

For the heat dissipation of electric appliances, silicon grease has been used in the past, and a resin such as a metal oxide or a thermally conductive filler is added to a bismuth component such as an organic polysiloxane. Regarding the metal oxide or the thermally conductive filler which allows the heat of the electric appliance to efficiently dissipate heat by the heat conduction effect, zinc oxide, cerium oxide, aluminum oxide, aluminum nitride, boron nitride, cerium oxide, or the like is used. Aluminium powder, carbon black, finely divided cerium oxide, bentonite, diamond, etc. (Japanese Patent Publication No. Sho 52-33272, JP-A-H10-110179, JP-A-2004-91743, JP-A-2008-255275 Bulletin).

On the other hand, there are also types which are different from the blush, and which exhibit an emulsion, an oil or an insulating coating, such as a styrene block copolymer, an adhesive-imparting resin, and a solvent. Insulating coatings and the like. Since the prior art, it has also provided a structure in which an insulating coating contains the following fillers to improve heat dissipation: boron nitride (BN), tantalum carbide (SiC), aluminum nitride (AlN), and aluminum oxide (Al ₂ O ₃ ). A heat-dissipating filler such as tantalum nitride (SiN), yttrium oxide (SiO ₂ ), magnesium oxide (MgO), zinc oxide (ZnO), or titanium oxide (TiO ₂ ). (Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei.

Insulation coils composed of electrically insulated electric wires of electrical appliances are not only excellent in heat dissipation and motor efficiency, but also in order to prevent problems such as a decrease in the service life of electrical appliances due to corona discharge between winding wires. It is required to have corona resistance; in addition, it is required to have a winding which does not cause the use of the winding, and is excellent in flexibility of the basic characteristics; further, in order to process the winding of the coil, the speed is high. The winding wire for performing this work is not easily damaged, so it is necessary to impart lubricity to reduce the friction coefficient.

The coils incorporated in the electric appliance are high-voltage and high-voltage when they are located in the motor or reactor (inductance) in the above-mentioned solar car; in addition, if they are self-melting by heating The work needs to be carried out at a high temperature. From the viewpoint of high temperature, it also has excellent heat resistance (thermal softening temperature), which is a basic requirement of the coil, and the insulating layer located in the coil is also required to be in two layers. In the case of a plurality of layers, it is necessary to belong to an insulated wire having a low degree of softening of the film at a high temperature to increase the insulation resistance and maintain the insulation performance at a high level.

[Patent Document 1]

Japanese Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. Japanese Patent Publication No. 2008- 026697, JP-A-2008-303263, and JP-A-2008-026699.

The present invention is to address the shortcomings of the above-described prior art and to provide a technique capable of solving the aforementioned needs.

Other objects and novel features of the present invention will be apparent from the description of the specification and the drawings.

The scope of the patent application of the present invention is as follows.

(Application No. 1 in the scope of patent application)

An electrically insulated electric wire with a plurality of layers, which is characterized in that: a peripheral layer of a first heat dissipating electrically insulating coating layer and a second heat dissipating electrically insulating coating layer are formed on the outer periphery of the lead wire, The first heat-dissipating electrically insulating coating layer is formed by adding a carbon isotope composed of graphite, carbon black, amorphous carbon, diamond, and fullerene to a heat-resistant resin, and the second heat-dissipating electrically insulating coating layer is attached to The heat resistant resin is formed by adding aluminum nitride, boron nitride, tantalum carbide, or a metal oxide.

(Applicant's patent scope item 2)

The electrical insulation of the multi-layer coating as described in claim 1 A line characterized in that the carbon isotope is graphite.

(Article 3 of the scope of patent application)

The electrically insulated electric wire of the multilayered skin according to the first or second aspect of the invention is characterized in that the graphite is 5 to 30 parts by weight based on 100 parts by weight of the heat resistant resin.

(Article 4 of the scope of patent application)

The electrically insulated electric wire of the multi-layered skin according to the first, second or third aspect of the invention is characterized in that aluminum nitride is added.

(Applicant's patent scope 5)

The electrically insulated electric wire of the multilayered skin according to the first, second, third or fourth aspect of the invention is characterized in that the aluminum nitride is 5 to 50 parts by weight based on 100 parts by weight of the heat resistant resin.

(Scope 6 of the patent application)

The multi-layer sheathed electrically insulated electric wire according to claim 1, 2, 3, 4 or 5, wherein the first heat dissipating electrically insulating coating layer is formed on the outer periphery of the wire by the inner and outer layers. The corona-resistant electrically insulating coating layer and the second heat-dissipating electrically insulating coating layer are formed by three layers of skin coating, and the first heat-dissipating electrically insulating coating layer is made of graphite, carbon black, amorphous carbon, and heat-resistant resin. a carbon isotope composed of diamond and fullerene, the corona-resistant electrically insulating coating layer is added with cerium oxide to the heat-resistant resin to impart corona resistance, and the second heat-dissipating electrically insulating coating layer is attached to The heat resistant resin is formed by adding aluminum nitride, boron nitride, tantalum carbide, or a metal oxide.

(Applicant's scope 7)

The electrically insulated electric wire of the multi-layered skin according to the sixth aspect of the invention is characterized in that the cerium oxide is 5 to 50 parts by weight based on 100 parts by weight of the heat resistant resin.

(Article 8 of the scope of patent application)

The multi-layer sheathed electrically insulated electric wire according to claim 1, 2, 3, 4 or 5, wherein the first heat dissipating electrically insulating coating layer is formed on the outer periphery of the wire by the inner and outer layers. The electrical insulating coating layer of the heat resistant resin and the three layers of the second heat dissipating electrically insulating coating layer are formed by adding graphite, carbon black, and amorphous carbon to the heat resistant resin. A carbon isotope composed of diamond or fullerene is formed, and the second heat-dissipating electrically insulating coating layer is formed by adding aluminum nitride, boron nitride, tantalum carbide, or a metal oxide to the heat resistant resin.

(Article 9 of the scope of patent application)

The multi-layer coated electrically insulated electric wire according to claim 1, 2, 3, 4, 5, 6 or 7 is characterized in that, in the periphery of the wire, the first heat-dissipating electric power is formed in the order of the inner and outer layers. The insulating coating layer, the electrically insulating coating layer of the heat resistant resin, the corona resistant electrically insulating coating layer, and the second heat dissipating electrically insulating coating layer are formed by four layers of skin coating, and the first heat dissipating electrically insulating coating layer is heat resistant. A carbon isotope composed of graphite, carbon black, amorphous carbon, diamond, and fullerene is added to the resin, and the corona-resistant electrically insulating coating layer is added with cerium oxide to the heat-resistant resin to impart corona resistance. The second heat-dissipating electrically insulating coating layer is formed by adding aluminum nitride, boron nitride, tantalum carbide, or a metal oxide to the heat-resistant resin.

(Applicant's patent scope 10)

The electrically insulated electric wire of the multi-layered skin as described in claim 1, 2, 3, 4, 5, 6, 7, 8, or 9 is characterized in that, in the periphery of the wire, the first layer is formed in the order of the inner and outer layers. a heat-dissipating electrically insulating coating layer, an electrically insulating coating layer of a heat-resistant resin, a corona-resistant electrically insulating coating layer, a second heat-dissipating electrically insulating coating layer, and a five-layer coating of an electrically insulating coating layer of a heat-resistant resin, The first heat-dissipating electrically insulating coating layer is formed by adding a carbon isotope composed of graphite, carbon black, amorphous carbon, diamond, and fullerene to a heat-resistant resin, and the corona-resistant electrically insulating coating layer is heat-resistant. Cerium dioxide is added to the resin to impart corona resistance, and the second heat-dissipating electrically insulating coating layer is formed by adding aluminum nitride, boron nitride, tantalum carbide, or a metal oxide to the heat-resistant resin.

(Applicant's scope 11)

The multilayer insulated electric insulated wire according to any one of claims 1 to 10, wherein the heat resistant resin is a polyamidene synthetic resin.

(Article 12 of the scope of patent application)

The multilayer insulated electric insulated wire according to any one of claims 1 to 11, wherein the heat resistant resin is polyamidimide or polyesterimide.

According to the present invention, there are the following advantages.

According to the invention, as described in the first aspect of the patent application, the first heat dissipating electrically insulating coating layer and the second heat dissipating electrically insulating coating layer to which different kinds of fillers are added are formed in the order of the inner and outer layers on the outer periphery of the wire. Therefore, the heat dissipation is excellent, the heat dissipation performance can be maintained at a high stage, and the motor efficiency is excellent, the heat is excellent when the heat is not stopped, and the insulation is excellent because of the excellent motor efficiency. The coil (electrically insulated wire) can extend the service life of various electric appliances such as electric motors (motors) and reactors (inductors) such as solar cars.

According to the invention, the filler constituting the first heat-dissipating electrically insulating coating layer and the filler constituting the second heat-dissipating electrically insulating coating layer are different, and the filler constituting the first heat-dissipating electrically insulating coating layer is made of graphite, carbon black, or The carbon isotope formed by carbon, diamond, and fullerene. The filler composed of the graphite is grown into a regular whisker-like thin graphite, which has excellent adhesion to the wire and also has excellent heat resistance.

The filler constituting the second heat-dissipating electrically insulating coating layer is made of aluminum nitride, boron nitride, tantalum carbide, or a metal oxide. The aluminum nitride, boron nitride, tantalum carbide, and metal oxide act together with the carbon isotope of the graphite or the like to remarkably improve heat dissipation and improve motor efficiency.

According to the invention, as described in the second aspect of the invention, the filler constituting the first heat-dissipating electrically insulating coating layer is preferably graphite from the above viewpoint.

According to the invention, as described in claim 3, the graphite constituting the filler of the first heat-dissipating electrically insulating coating layer is preferably heat-resistant from the viewpoint of adhesion to the wire and the whisker-like effect. The resin is used in an amount of 5 to 30 parts by weight based on 100 parts by weight.

According to the invention, as described in the fourth aspect of the invention, the filler constituting the second heat-dissipating electrically insulating coating layer is excellent in the relationship with the filler constituting the first heat-dissipating electrically insulating coating layer, heat dissipation, and motor efficiency. From the standpoint of view, it is preferred to add aluminum nitride.

According to the invention, as described in claim 5, when nitrogen is used When aluminum is used as the filler constituting the second heat-dissipating electrically insulating coating layer, it is preferable to add 5 to 50 parts by weight of aluminum nitride based on 100 parts by weight of the heat-resistant resin from the viewpoint of heat dissipation and motor efficiency. .

According to the invention, as described in claim 6, it is preferable to introduce cerium oxide into the heat resistant resin between the first heat dissipating electrically insulating coating layer and the second heat dissipating electrically insulating coating layer. A corona-resistant electrically insulating coating layer is provided to form a three-layer coating (film, layer). The basic structure of the two-layer coating comprising the first heat-dissipating electrically insulating coating layer and the second heat-dissipating electrically insulating coating layer according to the first aspect of the invention is excellent in heat dissipation. In the case where corona resistance is also required, the corona resistance is required to be more sufficient. Therefore, it is preferable to introduce a corona-resistant electrically insulating coating layer which is added with a cerium oxide to a heat-resistant resin to provide a corona resistance. Layer covering. In addition to cerium oxide, tantalum carbide, tantalum nitride, molybdenum disulfide, or the like may be used. However, from the viewpoint of not improving the flexibility of the basic characteristics of the winding wire and improving the corona resistance, it is preferably used. Ceria (SiO ₂ ).

According to the invention, as described in the seventh aspect of the invention, the addition of cerium oxide to the heat resistant resin is introduced between the first heat dissipating electrically insulating coating layer and the second heat dissipating electrically insulating coating layer. In the case of the corona-resistant electro-optical-resistant insulating coating layer, it is preferable that the flexibility of the basic characteristics of the winding is not deteriorated and the corona resistance is improved, and it is preferably 100 parts by weight with respect to the heat-resistant resin. 5 to 50 parts by weight of cerium oxide is added.

According to the invention, as described in claim 8, the first heat dissipating electrically insulating coating layer and the second heat dissipating electrically insulating coating layer are preferably A three-layer coating (film, layer) was formed by introducing an electrically insulating coating layer of a heat resistant resin. According to the first aspect of the patent application, the basic structure of the two-layer covering which is composed of the first heat-dissipating electrically insulating coating layer and the second heat-dissipating electrically insulating coating layer is excellent in heat dissipation. After the filler is mixed, it becomes hard, so that the flexibility of the basic characteristics of the use of the winding wire is not excellent, and the winding is easily deteriorated. To compensate for this, it is preferable to introduce an electrically insulating coating layer of a heat resistant resin.

According to the invention, as described in claim 9, the corona-resistant electrically insulating coating which imparts corona resistance is introduced between the first heat-dissipating electrically insulating coating layer and the second heat-dissipating electrically insulating coating layer. At the same time as the layer, the electrically insulating coating layer of the heat-resistant resin is further introduced, and the four-layer covering is formed, so that both the flexibility and the corona resistance can be simultaneously improved, which is preferable.

According to the invention, as described in claim 10, when the first heat-dissipating electrically insulating coating layer and the second heat-dissipating electrically insulating coating layer are introduced, a corona-resistant electrical insulating coating which imparts corona resistance is introduced. At the same time of the layer, the electrically insulating coating layer of the heat-resistant resin is further introduced, and the electrically insulating coating layer of the heat-resistant resin is further introduced in the uppermost layer to form a 5-layer covering, which can make the flexibility and the corona resistance. The function is improved, and the second heat-dissipating electrically insulating coating layer of the electrically insulated electric wire is covered by the electrically insulating coating layer of the heat-resistant resin, and the winding of the coil is not easily subjected to the high-speed operation at the time of coil winding processing. Since it is damaged, it is possible to impart lubricity to the electrically insulating coating layer of the heat resistant resin to lower the friction coefficient.

According to the present invention, as the resin constituting the electrically insulated electric wire, as described in the eleventh aspect of the patent application, a heat resistant resin can be used. a coil that is incorporated into an appliance, It is required to use a motor or a reactor (inductor) located in the above-mentioned solar vehicle as a starting point, or to increase the voltage by a large current, or to perform self-melting by a heated coil. It is also required to have excellent heat resistance (heat softening temperature) at a high temperature, and the insulating layer of the multilayer coating which consists of two layers etc. in this coil is the insulation which consists of a heat resistant resin, and the softening of the film is low at high temperature. wire. The heat resistant resin is preferably a polyimine-based synthetic resin from the viewpoint of the above requirements.

According to the present invention, the heat-resistant resin composed of the polyimine-based synthetic resin is excellent in heat resistance, flexibility, melt adhesion, and the like, and is in the solar vehicle described above. The method of increasing the voltage by a large current, such as a motor or a reactor (inductor), is considered to be resistant, and it is preferable to use a polyimide or a polyesterimide.

The carbon isotope used in the first heat-dissipating electrically insulating coating layer in the present invention includes carbon black, amorphous carbon, diamond, and fullerene in addition to graphite.

The carbon isotope may be used in any shape such as a granular form, a sheet form, or a short fiber form. However, when a powder is used, it is preferable from the viewpoints of heat dissipation and motor efficiency.

Fullerene is a general term for the smallest structure of a cluster of complex carbon atoms. The origin of the structure is different from 14 diamonds and 6 graphites, starting from tens of numbers of atoms. carbon element Isomers.

The carbon isotope also includes a single-layer or multi-layered coaxial tubular material composed of a six-ring network structure (graphite sheet) made of carbon such as a carbon tube. A carbon nanotube is an isomer of carbon and is also a type of the above fullerene.

In view of the carbon isotope, it is preferable to use graphite from the viewpoint of having regular whisker-like thin graphite, good adhesion to a wire, and excellent heat resistance.

The graphite is 5 to 30 parts by weight, preferably 10 to 20 parts by weight, per 100 parts by weight of the heat resistant resin (resin component or nonvolatile component).

If the amount of graphite is less than 5 parts by weight, the whisker-like effect will be less, and if it exceeds 30 parts by weight, the adhesion to the wire will be deteriorated.

The filler used in the second heat-dissipating electrically insulating coating layer in the present invention may, for example, be aluminum nitride, boron nitride, tantalum carbide or a metal oxide.

The aluminum nitride, boron nitride, tantalum carbide, metal oxide and the carbon isotope such as graphite described above act together to significantly increase the heat dissipation, and also improve the motor efficiency.

The thermal conductivity of aluminum nitride (AlN) is about 170 (W/m‧K), the thermal conductivity of boron nitride (BN) is about 210 (W/m‧K), and the thermal conductivity of tantalum carbide (SiC) is about 270 (W/m‧K).

Examples of the metal oxide include alumina, zinc oxide, titanium oxide, and the like. It can also be a metal nanoparticle.

The relationship between the filler constituting the second heat-dissipating electrically insulating coating layer and the filler constituting the first heat-dissipating electrically insulating coating layer, heat dissipation and motor efficiency It is preferable to add aluminum nitride (AlN) from the viewpoint of being excellent.

According to the present invention, when aluminum nitride is used as the filler constituting the second heat-dissipating electrically insulating coating layer, the aluminum nitride is 5 to 50 parts by weight with respect to 100 parts by weight of the heat-resistant resin (resin component, non-volatile component). It is preferably 10 to 30 parts by weight.

When the amount of aluminum nitride is less than 5 parts by weight, the heat dissipation property and the motor efficiency are deteriorated. On the other hand, when it exceeds 50 parts by weight, coating is difficult to form.

In the present invention, in order to make the corona resistance more demanding, a corona-resistant electrically insulating coating layer which is added with a cerium oxide to a heat-resistant resin to impart corona resistance, and an inorganic compound which can improve the corona resistance can also be introduced. It may be tantalum carbide, tantalum nitride, molybdenum disulfide or the like. However, it is preferable to use cerium oxide (SiO ₂ ) from the viewpoint of not improving the flexibility of the basic characteristics of the winding wire and improving the corona resistance.

When the particle size of the cerium oxide (SiO ₂ ) is 20 μm or less, the flexibility of the basic characteristics of the winding wire is not deteriorated, and the corona resistance is improved, which is preferable. The particle diameter is preferably 20 μm or less, more preferably 10 to 20 μm.

The cerium oxide (SiO ₂ ) can be used in the form of an organic cerium oxide sol (cerium oxide sol dispersed in an organic solvent). The organic cerium oxide sol can use a finished product that is commercially available. For example, DMAC-ST, IPA-ST, EG-ST, and NPC-ST-30 (manufactured by Nissan Chemical Industries, Ltd.), and the above organic cerium oxide sol has the following physical properties.

DMAC-ST has a SiO ₂ content of 20 to 21%, a H ₂ O content of 3 or less, a dispersing solvent of N,N-dimethylacetamide, a particle size of 10 to 20 μm, and a viscosity of 1 to 10 cp. (20 ° C) organic cerium oxide sol.

IPA-ST is an organic cerium oxide sol having a SiO ₂ content of 30 to 31%, a H ₂ O content of 2 or less, a dispersing solvent of isopropanol, a particle diameter of 10 to 20 μm, and a viscosity of 3 to 20 cp (20 ° C).

EG-ST is an organic cerium oxide sol having a SiO ₂ content of 20 to 21%, a H ₂ O content of 2 or less, a dispersion solvent of ethylene glycol, a particle size of 10 to 20 μm, and a viscosity of 20 to 100 cp (20 ° C). .

NPC-ST-30 is an organic cerium oxide sol having a SiO ₂ content of 30 to 31%, a H ₂ O content of 1.5 or less, a dispersion solvent of ethylene glycol monopropyl ether, a particle diameter of 10 to 15 μm, and a viscosity of 25 cp or less (20 ° C). .

Among the above organic cerium oxide sols, DMAC-ST is particularly preferred.

In addition, Degussa/Aero series products (made by Toshinaga Chemical Co., Ltd.) can also be used.

The inorganic compound is added in an amount of 5 to 50 parts by weight based on 100 parts by weight of the heat resistant resin (resin component, nonvolatile component).

When the amount is less than 5 parts by weight, the corona resistance (corona discharge resistance) is not exhibited. On the other hand, when it exceeds 50 parts by weight, the corona resistance is excellent, but the flexibility is deteriorated. When the coating film is thinned, the flexibility is deteriorated. Further, even if it is added after more than 50 parts by weight, since the effect of corona resistance is saturated, it is not economical.

The heat-resistant resin used in the present invention may be made of polyester or the like, but is excellent in heat resistance, flexibility, melt adhesion, etc., and is large in the motor or reactor (inductance) in the solar vehicle. The method of increasing the current and increasing the voltage is considered to be resistant, and is preferably a polyimine-based resin, and further, the polyimide-based resin is, for example, polyamidimide. Polyester imide is preferred.

The electrically insulating coating layer of the heat resistant resin introduced between the first heat dissipating electrically insulating coating layer and the second heat dissipating electrically insulating coating layer in the present invention, or the electrically insulating coating of the heat resistant resin as the upper layer (coating layer) of the insulating layer For the layer, for example, a resin composition comprising a heat resistant resin or various additives added to the heat resistant resin can be dissolved in an organic solvent to form an electrically insulating coating material.

The organic solvent can be exemplified by cresol, phenol, N-methyl pyrrolidone, dimethylformamide, dimethylacetamide, xylene, solvent naphtha.

In the additive, for example, a crosslinking agent may be used in addition to the above-mentioned filler, and examples of the crosslinking agent include a decane coupling agent.

The additive may also be added with an antioxidant (weather resistance agent) such as a layered viscosity mineral, a colorant or a phenolic antioxidant, a flame retardant, and a reaction catalyst, as needed.

In the present invention, a lubricant may be added to the electrically insulating coating layer of the heat-resistant resin located in the uppermost layer (coating layer) of the insulating layer to enhance the effect, and by imparting lubricity, the deterioration of the electric wire can be reduced and the self-degraded Lubricity.

As the lubricant, for example, a fatty acid ester, a low molecular polyethylene, a wax or the like can be used.

An example of the structure of the electrically insulated electric wire of the present invention is shown in Fig. 1.

The electrical wire M in the drawing has a basic structure of the first heat dissipating electrically insulating coating layer 1 and the second heat dissipating electrically insulating coating layer 4 on the periphery of the wire R such as a copper wire. 1 between the heat-dissipating electrically insulating coating layer 1 and the second heat-dissipating electrically insulating coating layer 4, introducing a heat resistance tree Adding cerium oxide to the grease and imparting a corona-resistant electrocorrosive insulating coating layer 3 and/or an electrically insulating coating layer 2 of a heat-resistant resin to form a 3-layer cover or a 4-layer cover; further, further The electrically insulating coating layer 5 of a heat resistant resin is applied to the surface of the second heat dissipating electrically insulating coating layer 4 to form a five-layer coating. This figure shows an example of the structure of the five-layer covered electrically insulated electric wire.

[Examples]

The invention is illustrated in more detail below by way of examples. However, the invention is not limited to those described in the following examples.

[Example 1] Structure and manufacturing method of insulated wire:

(a) A 5-layer covered insulated wire of the following structure

Bottom layer: Neoheat AI-26M

Polyimine-based coating (manufactured by Dongte Coating Co., Ltd.)

+ graphite (20 parts by weight based on 100 parts by weight of the above resin component and nonvolatile component)

Middle: Neoheat AI-602

Polyimine-based coating (manufactured by Dongte Coating Co., Ltd.)

Neoheat AI-26M

Polyimine-based coating (manufactured by Dongte Coating Co., Ltd.)

+SiO ₂ (20 parts by weight based on 100 parts by weight of the above resin component and nonvolatile component)

Neoheat AI-26M

Polyimine-based coating (manufactured by Dongte Coating Co., Ltd.)

+AlN (20 parts by weight based on 100 parts by weight of the above resin component and nonvolatile component)

Upper level: Neoheat AI-26M

Polyimine-based coating (manufactured by Dongte Coating Co., Ltd.)

(b) An insulated wire is produced by the following method.

(1) Extrusion methods (dies) and times

D11 (1+3+2+2+3)

(1.05/1.06, 1.07, 1.08/1.09, 1.10.1.11, 1.12/1.13, 1.14, 1.15)

(2) Sintering temperature (°C)

370-450-500 ° C, tempered 550-580 ° C

(3) Line speed: 20m/min

(4) Conductor diameter: 1.0mm

(5) Film thickness: 0.042mm

Evaluation of wire characteristics: (A) Heat dissipation and motor efficiency

(1) Test method

An insulated wire formed according to the above method is wound on a core slot of a motor of an experimental device, which is a core slot for winding an electric wire, a magnet, and The outer casing is constructed, and the difference (°C) between the winding temperature and the room temperature is measured as time passes (S). Further, the temperature measurement was carried out at 10 A to a winding temperature of 50 ° C, and then allowed to run at 4 A for 30 minutes, and the temperature per minute was measured. The motor efficiency was measured at the beginning of 5 minutes and at the end of 5 minutes.

The above results are shown in the graph of Fig. 2. The results are shown in Table 1.

(B) Determination of wire characteristics

The wire characteristics were measured for the following evaluation methods of wire characteristics.

(a) Breaking voltage: The dielectric breakdown voltage (kV) was measured in accordance with JIS C 3216-4.

(b) B.D.V. Residual ratio: The dielectric breakdown voltage (kV) after heat treatment at 260 ° C for 168 hours was measured, and the residual ratio (%) of the dielectric breakdown voltage (kV) with respect to the above (a) was measured.

(c) Glycerin pressure resistance: Determination of dielectric breakdown voltage (kV) in glycerol

(d) Thermal shock (1): The number of cracks after heat treatment at 220 ° C for 0.5 hours was measured according to the NEMA method.

(e) Thermal shock (2): The number of cracks after heat treatment at 240 ° C for 1 hour was measured.

(f) Flexibility: The number of cracks in pin holes at 10%, 20%, and 30% stretch curl was measured. It was measured by 1 d (autogenous diameter).

(g) Repeat abrasion test: The average value of the number of times of repeated abrasion at max/min was measured.

(h) Softening resistance test: The measurement was carried out under a load of 2000 gf/N. Calculate the average (°C).

(i) Glass transition temperature (Tg): Tg (Tan δ) (° C.) was measured according to a heating method and a metal bath method. The results are shown in Table 2.

[Embodiment 2]

The procedure of the electric wire was measured in the same manner as in Example 1 except that the four-layer covered insulated wire having the following structure was produced. The results are shown in Table 2.

The bottom layer: Neoheat AI-26M polyamidimide-based paint (manufactured by Tote Coating Co., Ltd.) + graphite (20 parts by weight based on 100 parts by weight of the above resin component and nonvolatile component)

Middle layer: Neoheat AI-602 polyamidimide coating (made by Tote Coating Co., Ltd.) Neoheat AI-26M polyamidimide coating (made by Tote Coating Co., Ltd.) + AlN (relative to the above resin composition) 20 parts by weight of the nonvolatile component, 20 parts by weight)

Upper layer: Neoheat AI-26M polyamidimide coating (manufactured by Dongte Coating Co., Ltd.)

The heat dissipation and motor efficiency were measured in the same manner as in Example 1 with respect to the above-mentioned four-layer covered insulated electric wire, and the same results as in Example 1 were obtained.

[Comparative Example 1]

The steps were the same as in Example 1 except that the five-layer covered insulated wire having the following structure was produced, and the heat dissipation and the motor efficiency were measured, and the wire characteristics were also measured.

Bottom layer: Neoheat AI-26M polyamidimide coating (manufactured by Dongte Coating Co., Ltd.)

Middle layer: Neoheat AI-602 polyamidimide coating (made by Tote Coating Co., Ltd.) Neoheat AI-26M polyamidimide coating (manufactured by Tote Coating Co., Ltd.)

Upper layer: Neoheat AI-26M polyamidimide coating (manufactured by Dongte Coating Co., Ltd.)

The results are shown in Fig. 2, Table 1, and Table 2.

[result]

As is apparent from the results of the examples and the comparative examples, as shown in Fig. 2, the temperature difference of the insulated electric wire of the present invention is higher than that of the comparative example, and the heat dissipation is excellent. On the other hand, the temperature difference of the comparative example is low, and the heat dissipation property is higher than that of the present invention. The invention was inferior.

Further, regarding the motor efficiency, as shown in Table 1, although the efficiency difference was small at the start of the test for 1 to 5 minutes, the embodiment of the present invention was 0.6 higher than the comparative example after the start of the time point of 26 to 30 minutes after the start. % efficiency, most efficient The rate of force is considered as one, and it can be inferred that this rate is excellent.

Further, from the results of the above examples and comparative examples, it was confirmed that the present invention is excellent in heat resistance, flexibility, corona resistance, and lubricity.

[Industrial availability]

The invention can be applied to various electrically insulated wires and electrical insulating coatings.

1‧‧‧1st heat-dissipating electrically insulating coating layer

2‧‧‧Heat resistant resin layer

3‧‧‧Corona resistant electrically insulating coating

4‧‧‧2nd heat-dissipating electrically insulating coating layer

5‧‧‧Heat resistant resin layer

M‧‧‧Electrically insulated wires

R‧‧‧ wire

Fig. 1 is a structural view showing an example of an electrically insulated electric wire of the present invention.

Fig. 2 is a graph showing the difference between the heat dissipation effects of the present invention and the comparative example.

1‧‧‧1st heat-dissipating electrically insulating coating layer

2‧‧‧Heat resistant resin layer

3‧‧‧Corona resistant electrically insulating coating

4‧‧‧2nd heat-dissipating electrically insulating coating layer

5‧‧‧Heat resistant resin layer

M‧‧‧Electrically insulated wires

R‧‧‧ wire

Claims (12)

An electrically insulated electric wire with a plurality of layers of sheathing, characterized in that: a second layer of skin covering the first heat dissipating electrically insulating coating layer and the second heat dissipating electrically insulating coating layer is formed on the outer periphery of the wire; The first heat dissipating electrically insulating coating layer is formed by adding a carbon isotope of at least one of graphite, carbon black, amorphous carbon, diamond, and fullerene to the heat resistant resin; and the second heat dissipating electrically insulating coating layer At least one of aluminum nitride, boron nitride, tantalum carbide, and metal oxide is added to the heat resistant resin. The multilayer insulated electrical insulated wire of claim 1, wherein the carbon isotope is graphite. The electrically insulated electric wire of the multilayered skin according to the first aspect of the invention, wherein the graphite is 5 to 30 parts by weight based on 100 parts by weight of the heat resistant resin. The multilayer insulated electric insulated wire according to the above aspect of the invention, wherein the aluminum oxide is added to the second heat dissipating electrically insulating coating layer. The electrically insulated electric wire of the multilayered skin according to the first aspect of the invention, wherein the aluminum nitride is 5 to 50 parts by weight based on 100 parts by weight of the heat resistant resin. The electrically insulated electric wire of the multi-layered skin according to the first aspect of the invention, wherein the outer periphery of the lead wire is further formed between the first heat dissipating electrically insulating paint layer and the second heat dissipating electrically insulating paint layer. 3-layer covering of the corona resistant electrically insulating coating layer; The first heat-dissipating electrically insulating coating layer is formed by adding a carbon isotope of at least one of graphite, carbon black, amorphous carbon, diamond, and fullerene to the heat resistant resin; the corona resistant electrically insulating coating layer is heat resistant Adding cerium oxide to the resin to impart corona resistance; and applying the second heat-dissipating electrically insulating coating layer to at least one of aluminum nitride, boron nitride, tantalum carbide, and metal oxide in the heat-resistant resin form. The electrically insulated electric wire of the multilayered skin according to the above aspect of the invention, wherein the cerium oxide is 5 to 50 parts by weight based on 100 parts by weight of the heat resistant resin. The electrically insulated electric wire of the multi-layered skin according to the first aspect of the invention, wherein the outer periphery of the lead wire is further formed between the first heat dissipating electrically insulating paint layer and the second heat dissipating electrically insulating paint layer. a three-layer coating of an electrically insulating coating layer of a heat resistant resin; the first heat dissipating electrically insulating coating layer is a carbon isotope in which at least one of graphite, carbon black, amorphous carbon, diamond, and fullerene is added to the heat resistant resin And the second heat dissipating electrically insulating coating layer is formed by adding at least one of aluminum nitride, boron nitride, tantalum carbide, and metal oxide to the heat resistant resin. The electrically insulated electric wire of the multi-layered skin according to the first aspect of the invention, wherein the outer periphery of the lead wire is formed between the first heat dissipating electrically insulating paint layer and the second heat dissipating electrically insulating paint layer, The order of the inner and outer layers further comprises a four-layer coating of an electrically insulating coating layer of a heat resistant resin and a corona resistant electrically insulating coating layer; The first heat-dissipating electrically insulating coating layer is formed by adding a carbon isotope of at least one of graphite, carbon black, amorphous carbon, diamond, and fullerene to the heat-resistant resin; the corona-resistant electrically insulating coating layer is The heat-resistant resin is added with cerium oxide to provide corona resistance; and the second heat-dissipating electrically insulating coating layer is added to at least one of aluminum nitride, boron nitride, tantalum carbide, and metal oxide in the heat-resistant resin. form. The multi-layer sheathed electrically insulated electric wire according to claim 1, wherein the outer periphery of the wire is formed between the first heat dissipating electrically insulating coating layer and the second heat dissipating electrically insulating coating layer. In the order of the inner and outer layers, the electrically insulating coating layer and the corona-resistant electrically insulating coating layer of the heat-resistant resin are further included, and the outer layer of the second heat-dissipating electrically insulating coating layer further comprises an electrically insulating coating layer of a heat-resistant resin. a layered coating; the first heat-dissipating electrically insulating coating layer is formed by adding a carbon isotope of at least one of graphite, carbon black, amorphous carbon, diamond, and fullerene to the heat resistant resin; the corona resistant electrically insulating coating The layer is added with cerium oxide to the heat resistant resin to impart corona resistance; and the second heat-dissipating electrically insulating coating layer is added with aluminum nitride, boron nitride, tantalum carbide, metal oxide in the heat resistant resin. Formed by at least one of them. The multilayer insulated electric insulated wire according to any one of claims 1 to 10, wherein the heat resistant resin is a polyamidene synthetic resin. The multi-layer coated electrically insulated electric wire according to claim 11, wherein the heat resistant resin is polyamidimide or polyesterimide.