JP2000331539A - Inverter surge resistant enameled wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inverter surge resistant enameled wire superior in an initial value and V-t characteristics (voltage/dielectric breakdown service life characteristics) after extension. SOLUTION: A versatile enameled wire resin coating layer 2 is provided right over a conductive wire, and a specific inorganic powder blended resin coating layer 3 for enameled wires comprising 100 wt. parts of a heat resistant resin for enameled wires, 30 to 100 wt. parts of an inorganic powder with a particle size ϕ not more than 0.1 μm, and 0.1 to 30 wt. parts of an affinity agent of the inorganic powder with the heat resistant resin for enameled wires is provided on an upper layer of the versatile enameled wire resin coating layer 2. Preferably, a toughened resin coating layer 4 for enameled wires is provided on an upper layer of the specific inorganic powder blended resin coating layer 3 for enameled wires.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter surge resistant enameled wire.

[0002]

2. Description of the Related Art Inverters are being attached to many electric devices as efficient variable speed control devices.

[0003] The inverter performs switching at several kHz to several tens kHz, and a surge voltage is generated for each pulse. Inverter surge is a phenomenon in which reflection occurs at a discontinuity point of impedance in the propagation system, for example, at the beginning or end of a wiring to be connected, and as a result, a voltage of up to twice the inverter output voltage is applied. In particular, IGB
The output pulse generated by a high-speed switching element such as T has a high voltage agility, so that the surge voltage is high even when the connection cable is short, and the voltage attenuation by the connection cable is small, and as a result, the output voltage is almost twice as high as the inverter output voltage. A voltage is generated.

[0004] A large amount of enamel wire is used as a magnet wire for inverter-related equipment, for example, electric equipment coils such as high-speed switching elements, inverter motors, and transformers. In addition, as described above, since a voltage nearly twice the output voltage of the inverter is applied to the inverter-related equipment, it is possible to minimize the deterioration of the inverter surge of the enamel wire which is one of the materials constituting the coils of the electric equipment. It is becoming required.

[0005] The inverter surge deterioration of an enamel wire is a phenomenon in which a partial discharge occurs in the enamel wire due to a surge voltage having a high peak value generated in the inverter, and the coating of the enamel wire causes the partial discharge deterioration due to the partial discharge. It is discharge deterioration.

In general, partial discharge deterioration refers to degradation of molecular chains caused by collision of charged particles generated by the partial discharge of the electrically insulating material, deterioration of sputtering, thermal melting or thermal decomposition deterioration due to local temperature rise, and chemical degradation caused by ozone generated by discharge. This is a phenomenon in which mechanical deterioration and the like occur in a complicated manner. For this reason, it can be seen that the thickness of an electrically insulating material deteriorated by actual partial discharge decreases.

It is considered that inverter surge deterioration of an enamel wire also proceeds by the same mechanism as general partial discharge deterioration.

By the way, inorganic electric insulating materials such as metal oxides, silicon oxides, metal nitrides and ceramics are known as electric insulating materials resistant to partial discharge deterioration.

[0009]

However, the enameled wire is inferior to the inorganic electrical insulating material in the inverter surge deterioration resistance because the enamel coating layer is essentially made of the resin for the organic electrical insulating material, the enamel wire. ing.

Therefore, an inorganic powder blended enameled wire has been proposed in which an inorganic powder is blended with a resin for a base enameled wire.

A Vt life test (voltage-dielectric breakdown life test) of this inorganic powder blend enameled wire as it is
The Vt characteristic (voltage-dielectric breakdown life characteristic)
Is good.

However, when the inorganic powder blend enameled wire is wound to form an electric device coil, and then the obtained electric device coil is subjected to a Vt life test (voltage-dielectric breakdown life test), Its Vt characteristic (voltage-dielectric breakdown life characteristic) is extremely poor.

This is because the inorganic powder blended enameled wire has poor mechanical properties such as flexibility, and is mechanically damaged by bending or stretching during winding work of electric equipment coils.
As a result, Vt characteristics (voltage-dielectric breakdown life characteristics) deteriorate.

Therefore, several attempts have been made to improve the mechanical properties of the inorganic powder blend enameled wire.

As a means for improving the mechanical properties of such an inorganic powder blend enameled wire, there is a method of overcoating a polyamide resin, a polyamideimide resin, a lubricant or the like on the upper layer of the inorganic powder blended enameled wire. However, even an inorganic powder blend enameled wire obtained by overcoating them cannot remarkably improve the Vt characteristics (voltage-dielectric breakdown life characteristics).

As a means for improving the mechanical properties of such an inorganic powder blended enameled wire, a coating for general-purpose enameled wire, for example, a coating for polyester enameled wire, a polyester imide enamelled, is placed below the inorganic powder blended enameled wire, ie, just above the conductor. It has been proposed to apply and bake a wire paint, a polyamideimide enamel wire paint, and the like. However, the fact is that the Vt characteristics (voltage-dielectric breakdown life characteristics) cannot be remarkably improved even if the general-purpose enamel wire paint is undercoated.

The present invention has been made in view of such a point, and an object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide an initial value and a Vt characteristic after expansion (voltage-dielectric breakdown). It is an object of the present invention to provide an inverter surge enameled wire having excellent life characteristics.

[0018]

The gist of the present invention lies in the following two points.

(1) A general-purpose enamel wire resin coating layer is provided immediately above a conductive wire, and 100 parts by weight of a heat-resistant enamel wire resin and a particle size φ0.1 μm are provided on the general-purpose enamel wire resin coating layer.
A specific inorganic powder blend enamel wire resin coating layer comprising 30 to 100 parts by weight of the following inorganic powder and 0.1 to 30 parts by weight of an affinity agent for the inorganic powder and the heat-resistant enamel wire resin is provided. Inverter surge resistant enameled wire characterized by the following.

(2) A general-purpose enamel wire resin coating layer is provided immediately above the conductor, and 100 parts by weight of a heat-resistant enamel resin and a particle size φ0.1 μm are formed on the general-purpose enamel wire resin coating layer.
A resin coating layer for a specific inorganic powder blend enamel wire comprising 30 to 100 parts by weight of the following inorganic powder and 0.1 to 30 parts by weight of an affinity agent for the inorganic powder and the resin for a heat-resistant enamel wire, and An inverter surge-resistant enamel wire comprising a resin coating layer for a tough enamel wire provided on an upper layer of the resin coating layer for a specific inorganic powder blend enamel wire.

In the present invention, the affinity agent between the inorganic powder and the resin for a heat-resistant enameled wire is preferably a coupling agent or an alkoxide or a mixture of a coupling agent and an alkoxide.

In the present invention, the coupling agent is preferably one or a mixture of two or more selected from silane compounds, titanium compounds and aluminum compounds.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the anti-inverter surge enameled wire of the present invention will be described.

In order to improve the Vt characteristics (voltage-dielectric breakdown life characteristics) and mechanical properties of an inorganic powder blended enameled wire obtained by blending an inorganic powder with a resin for a base enameled wire, a resin for the base enameled wire is required. It is important that the inorganic powder is uniformly blended at a high density without generating voids or defects. Therefore, it is necessary to use an inorganic powder having a very fine particle size.

The basic structure of the inverter surge-resistant enameled wire of the present invention is such that a resin coating for general-purpose enameled wire is provided immediately above the conductor, and a resin coating layer for a specific inorganic powder blend enameled wire is provided thereon. In the present invention, when the mechanical properties are further improved, a resin coating layer for a tough enamel wire is further provided on the resin coating for a specific inorganic powder blend enamel wire.

Here, the resin coating for general-purpose enameled wire provided directly above the conductive wire includes a polyester resin enamel coating layer, a polyesterimide resin enamel coating layer, a polyamideimide resin enamel coating layer, and the like.

The specific inorganic powder blended resin coating layer for the enameled wire is a specific inorganic powder formed by blending a base heat resistant enameled wire coating with a fine inorganic powder on the upper layer of the general-purpose enameled resin coated film. It is obtained by applying and baking a paint for a blended enameled wire. Here, examples of the base heat-resistant enamel wire paint include a polyester enamel wire paint, a polyesterimide enamel wire paint, and a polyamideimide enamel wire paint.

As fine inorganic powders, silica, titanium oxide (titania), inorganic oxides such as alumina and zirconia, mica, talc, silicon carbide, etc., capable of improving Vt characteristics (voltage-dielectric breakdown life characteristics) can be used. There is silicon nitride and the like.

In the present invention, these inorganic powders have a particle diameter φ.
The reason for limiting the thickness to 0.1 μm or less is to uniformly blend the inorganic powder with the resin for the base enameled wire at a high density and without generating voids or defective portions. For example, the resin coating layer for an inorganic powder blend enamel wire obtained by applying and baking an inorganic powder blend enamel wire coating obtained by blending an inorganic powder having a particle diameter of 0.3 μm or more with a base enamel wire resin has voids As a result, a large number of defects and defects occur, and as a result, the intended Vt characteristics (voltage-dielectric breakdown life characteristics) cannot be improved.

Further, in the present invention, the amount of the inorganic powder is limited to 30 to 100 parts by weight with respect to 100 parts by weight of the resin component of the base heat-resistant enameled wire coating. This is because the effect of improving the voltage-dielectric breakdown life characteristic is small. Conversely, if the amount is 100 parts by weight or more, the Vt characteristic (voltage-dielectric breakdown life characteristic) after elongation or after winding the coil of an electric device is deteriorated.

In the present invention, the coupling agent or the alkoxide is blended because the resin component of the base heat-resistant enameled wire is strongly bonded to the inorganic powder, and the mechanical properties and the mechanical properties of the inverter-surge-resistant enamelled wire obtained thereby are improved. V
This is because the -t characteristic (voltage-dielectric breakdown life characteristic) is remarkably improved.

Here, the coupling agent has an inorganic affinity group having a high affinity with the inorganic powder and a resin affinity group having a high affinity with the resin component of the base heat-resistant enamel wire paint. As the inorganic affinity group, there is an alkoxide group and the like. The resin affinity group includes an epoxy group and the like.

Examples of the coupling agent include silane compounds, titanium compounds, and aluminum compounds.
As the silane compound, vinyl triethoxy silane,
Examples include vinyltrimethoxysilane, glycidoxypropylmethyldiethoxysilane, aminopropyltriethoxysilane, and methacryloxypropyltrimethoxysilane. Examples of the titanium compound include isopropyl triisostearoyl titanate and isopropyl dimethacryl isostearyl titanate. Examples of the aluminum-based compound include acetoalkoxyaluminum diisopropylate.

In the present invention, examples of the resin film layer for enamel wire provided on the resin film layer for specific inorganic powder blend enamel wire include a polyamide resin enamel film layer and a polyamide-imide resin enamel film layer.

In the present invention, the alkoxide includes tetramethoxysilane, tetraethoxysilane, tetrapropoxytitanium, tetrabutoxytitanium, tetrastearyloxytitanium, tetrabutoxyzirconium, triethoxyaluminum, trimethoxyaluminum and the like.

In the present invention, examples of the resin coating layer for a tough enamel wire include a polyamideimide resin coating layer and a polyamide resin coating layer.

[0037]

Next, an embodiment of the anti-inverter surge enamel wire of the present invention will be described together with a comparative example.

Example 1 First, an imide-modified polyester enamel wire paint was applied to a copper wire having a conductor diameter of 1.0 mm to a thickness of 25 μm and baked to form a resin coating layer for a general-purpose enamel wire. An imide-modified polyester resin coating layer was provided.

Next, on the imide-modified polyester resin coating layer, 100 parts by weight of a resin component of the paint EH-402 for tris (2-hydroxyethyl) isocyanurate-modified polyester imide enamel wire of Dainichi Seika Kogyo Co., Ltd. 50 parts by weight of a titanium oxide powder having a particle size of φ0.02 μm and 5 parts by weight of Titacoat S151 of titanium stearate as a titanium-based coupling agent of Nippon Soda Co., Ltd. were blended for the specific inorganic powder blend enamel wire of Example 1. Paint was obtained.

Next, on the imide-modified polyester resin coating layer obtained above, the specific inorganic powder blend enamel wire coating of Example 1 obtained above was applied and baked to obtain a 7 μm-thick example. A specific inorganic powder blend resin coating layer for enameled wire was provided.

Next, a coating material for polyamideimide enamel wire was applied as a tough enamel wire resin coating layer to a thickness of 5 μm on the specific inorganic powder blended enamel wire resin coating layer of Example 1. Then, by baking to provide a polyamide-imide resin coating layer, the inverter surge-resistant enameled wire of Example 1 was obtained.

FIG. 1 is a sectional view of an inverter surge resistant enameled wire according to the first embodiment.

In FIG. 1, 1 is a copper wire, 2 is a resin coating layer for a general-purpose enamel wire, 3 is a resin coating layer for a specific inorganic powder blend enamel wire, and 4 is a resin coating layer for a tough enamel wire.

(Example 2) First, an imide-modified polyester enamel wire paint was applied to a copper wire having a conductor diameter of 1.0 mm to a thickness of 25 µm and baked to form an imide-modified polyester resin coating layer. Was.

Next, on the imide-modified polyester resin coating layer, 100 parts by weight of a resin component of Tris (2-hydroxyethyl) isocyanurate-modified polyester imide enamel wire paint EH-402 manufactured by Dainichi Seika Kogyo Co., Ltd. was added. 75 parts by weight of a titanium oxide powder having a particle size of φ0.02 μm, 3 parts by weight of titanium stearate Titacoat S151 of Nippon Soda Co., Ltd., and tetra-n of titanium coupling agent of Nippon Soda Co., Ltd. A specific inorganic powder blend enamel wire coating material of Example 2 was obtained by blending 1 part by weight of butoxytitanium polymer B-10.

Next, on the imide-modified polyester resin coating layer obtained above, the specific inorganic powder blended enamel wire paint of Example 2 obtained above was applied and baked to obtain a 7 μm-thick Example. 2 was provided with a resin coating layer for a specific inorganic powder blend enameled wire.

Next, a coating material for a polyamide-imide enameled wire is applied to the specific inorganic powder blended enameled-wire coating layer of Example 2 so as to have a thickness of 5 μm, and baked to form a polyamide-imide resin-coated film layer. By providing
An inverter surge resistant enamel wire of Example 2 was obtained.

Example 3 First, an imide-modified polyester enamel wire coating was applied to a copper wire having a conductor diameter of 1.0 mm to a thickness of 25 μm and baked to form an imide-modified polyester resin coating layer. Was.

Next, on the imide-modified polyester resin coating layer, 100 parts by weight of the resin component of Hitachi Chemical Chemical Co., Ltd.
75 parts by weight of 0.05 μm silicon oxide powder, 20 parts by weight of tetramethoxysilane, γ-
KBM40 of glycidoxypropyltrimethoxysilane
By mixing 0.5 part by weight of No. 3, the specific inorganic powder blended enamel wire paint of Example 3 was obtained.

Next, on the imide-modified polyester resin coating layer obtained above, the specific inorganic powder blend enamel wire coating of Example 3 obtained above was applied and baked to obtain a 7 μm-thick Example. The resin coating layer for No. 3 specific inorganic powder blend enameled wire was provided.

Next, on the resin coating layer for the specific inorganic powder blend enameled wire of Example 3, a polyamideimide enameled wire coating is applied to a thickness of 5 μm and baked to form a polyamideimide resin coating layer. By providing
An inverter anti-surge enameled wire of Example 3 was obtained.

Example 4 First, a coating material for polyamideimide enamel wire HI-406 manufactured by Hitachi Chemical Co., Ltd. was applied to a copper wire having a conductor diameter of 1.0 mm so as to have a thickness of 10 μm and baked to obtain a general-purpose enamel wire. The polyamide-imide resin coating layer of the resin coating layer for use was provided.

Next, on the polyamide-imide resin coating layer, 100 parts by weight of a resin of a polyamide-imide enamel wire paint HI-406 manufactured by Hitachi Chemical Co., Ltd.
30 parts by weight of 5 μm silicon oxide powder, 20 parts by weight of tetramethoxysilane, 0.5 parts by weight of KBM1003 of vinyltrimethoxysilane of Shin-Etsu Chemical Co., Ltd., TBT of tetra-n-butoxytitanium of Nippon Soda Co., Ltd. Was blended to obtain a specific inorganic powder blended enamel wire coating material of Example 4.

Next, on the polyamide-imide resin coating layer obtained above, the specific inorganic powder blend enamel wire paint of Example 4 obtained above was applied and baked, and the specific coating of Example 4 having a thickness of 27 μm was obtained. The inverter surge resistant enameled wire of Example 4 was obtained by providing a resin coating layer for an inorganic powder blended enameled wire.

FIG. 2 is a sectional view of an inverter surge resistant enameled wire according to the fourth embodiment.

In FIG. 2, 1 is a copper wire, 2 is a resin coating layer for a general-purpose enamel wire, and 3 is a resin coating layer for a specific inorganic powder blend enamel wire.

Example 5 First, a polyamideimide enamel wire coating HI-406 made by Hitachi Chemical Co., Ltd. was applied to a copper wire having a conductor diameter of 1.0 mm to a thickness of 10 μm and baked to obtain a polyamideimide resin. A coating layer was provided.

Next, on the polyamide-imide resin coating layer, 100 parts by weight of the resin component of the polyamide-imide enamel wire paint HI-406 manufactured by Hitachi Chemical Co., Ltd.
By mixing 30 parts by weight of a 2 μm titanium oxide powder, 10 parts by weight of TST of tetrastearyloxytitanium manufactured by Nippon Soda Co., and 0.3 parts by weight of a tetra-n-butoxytitanium polymer, the specific inorganic compound of Example 5 was mixed. A powder blend enamel wire paint was obtained.

Next, the specific inorganic powder blend enamel wire paint of Example 5 obtained above was applied on the polyamide-imide resin coating layer obtained above and baked, and the specific paint of Example 5 having a thickness of 27 μm was obtained. An inverter surge resistant enameled wire of Example 5 was obtained by providing a resin coating layer for an inorganic powder blended enameled wire.

Comparative Example 1 First, an imide-modified polyester enamel wire coating was applied to a copper wire having a conductor diameter of 1.0 mm to a thickness of 25 μm and baked to form an imide-modified polyester resin coating layer. Was.

Next, on the imide-modified polyester resin coating film layer, 100 parts by weight of a resin component of Tris (2-hydroxyethyl) isocyanurate-modified polyester imide enamel wire paint EH-402 manufactured by Dainichi Seika Kogyo Co., Ltd. 20 parts by weight of a titanium oxide powder having a particle diameter of 0.02 μm and 5 parts by weight of titanium stearate titanium oxide S151 of Nippon Soda Co., Ltd. were mixed in an amount of 5 parts by weight. Paint was obtained.

Next, the inorganic powder-blended enamel wire paint of Comparative Example 1 obtained above was applied on the imide-modified polyester resin coating layer obtained above and baked to obtain Comparative Example 1 having a thickness of 7 μm. Was provided with an inorganic powder blended enameled resin coating layer.

Next, a polyamideimide enamel wire coating material was applied to the inorganic powder blend enamel wire resin coating layer of Comparative Example 1 so as to have a thickness of 5 μm and baked to form a polyamideimide resin coating film layer. By providing the same, an inorganic powder blend enameled wire of Comparative Example 1 was obtained.

(Comparative Example 2) First, an imide-modified polyester enamel wire coating was applied to a copper wire having a conductor diameter of 1.0 mm to a thickness of 25 μm and baked to form an imide-modified polyester resin coating layer. Was.

Next, on the imide-modified polyester resin coating layer, 100 parts by weight of a resin component of Tris (2-hydroxyethyl) isocyanurate-modified polyesterimide enamel wire paint EH-402 manufactured by Dainichi Seika Kogyo Co., Ltd. By mixing 120 parts by weight of titanium oxide powder having a particle diameter of 0.02 μm and 5 parts by weight of titanium stearate titanium coat S151 of Nippon Soda Co., Ltd. for inorganic powder blend enamel wire of Comparative Example 2 Paint was obtained.

Next, the inorganic powder blended enamel wire paint of Comparative Example 2 obtained above was applied to the imide-modified polyester resin coating layer obtained above and baked to obtain a 7 μm thick Comparative Example 2. Was provided with an inorganic powder blended enameled resin coating layer.

Next, a polyamide imide enamel wire paint is applied to a thickness of 5 μm on the inorganic powder blend enamel wire resin paint layer of Comparative Example 2 and baked to form a polyamide imide resin paint layer. By providing the same, an inorganic powder blend enameled wire of Comparative Example 2 was obtained.

Comparative Example 3 First, an imide-modified polyester enamel wire coating was applied to a copper wire having a conductor diameter of 1.0 mm to a thickness of 25 μm and baked to form an imide-modified polyester resin coating layer. Was.

Next, on the imide-modified polyester resin coating layer, 100 parts by weight of the resin component of the paint EH-402 for tris (2-hydroxyethyl) isocyanurate-modified polyester imide enamel wire of Dainichi Seika Kogyo Co., Ltd. By mixing 75 parts by weight of a titanium oxide powder having a particle size of 0.02 μm, a coating for an inorganic powder blend enameled wire of Comparative Example 3 was obtained.

Next, the inorganic powder blended enamel wire paint of Comparative Example 3 obtained above was applied on the imide-modified polyester resin coating layer obtained above and baked to obtain a 7 μm thick Comparative Example 3. Was provided with an inorganic powder blended enameled resin coating layer.

Next, a polyamide imide enamel wire paint was applied to a thickness of 5 μm on the inorganic powder blend enamel wire resin paint layer of Comparative Example 3 and baked to form a polyamide imide resin paint layer. By providing the same, an inorganic powder blend enameled wire of Comparative Example 3 was obtained.

Comparative Example 4 First, an imide-modified polyester enamel wire coating was applied to a copper wire having a conductor diameter of 1.0 mm to a thickness of 25 μm and baked to form an imide-modified polyester resin coating layer. Was.

Next, on the imide-modified polyester resin coating layer, 100 parts by weight of a resin component of Tris (2-hydroxyethyl) isocyanurate-modified polyester imide enamel wire paint EH-402 manufactured by Dainichi Seika Kogyo Co., Ltd. By mixing 75 parts by weight of titanium oxide powder having a particle diameter of φ0.30 μm, a coating material for an inorganic powder blend enameled wire of Comparative Example 4 was obtained.

Next, the inorganic powder blended enamel wire paint of Comparative Example 4 obtained above was applied on the imide-modified polyester resin coating layer obtained above and baked to obtain a 7 μm-thick Comparative Example 3. Was provided with an inorganic powder blended enameled resin coating layer.

Next, a polyamide imide enamel wire paint is applied to a thickness of 5 μm on the inorganic powder blend enamel wire resin paint layer of Comparative Example 4 and baked to form a polyamide imide resin paint layer. By providing the same, an inorganic powder blend enameled wire of Comparative Example 4 was obtained.

Comparative Example 5 An imide-modified polyester enamel wire paint having a thickness of 3 mm was coated on a copper wire having a conductor diameter of 1.0 mm.
The imide-modified polyester tree of Comparative Example 5 was obtained by coating and baking to a thickness of 7 μm.

(Comparative Example 6) A paint EH-402 for tris (2-hydroxyethyl) isocyanurate-modified polyesterimide enamel wire manufactured by Dainichi Seika Kogyo Co., Ltd. was formed on a copper wire having a conductor diameter of 1.0 mm so as to have a thickness of 37 μm. By coating and baking, a tris (2-hydroxyethyl) isocyanurate-modified polyesterimide enamel wire of Comparative Example 6 was obtained.

Comparative Example 7 A polyamide imide enamel wire coating HI-406 manufactured by Hitachi Chemical Co., Ltd. was applied to a copper wire having a conductor diameter of 1.0 mm to a thickness of 37 μm and baked to obtain a polyamide of Comparative Example 7. An imido enamel wire was obtained.

(Method for testing characteristics of enameled wire) A characteristic test of the enameled wire was performed according to JIS-C3003.

(Characteristic test results of enameled wires) The characteristic test results of these enameled wires are as shown in Table 1.

[0081]

[Table 1]

As can be seen from Table 1, the inorganic powder blend enameled wire of Comparative Example 1 had a Vt characteristic (voltage-dielectric breakdown life characteristic) of 1.5 hours at the initial value and 1.3 after 10% elongation.
h, extremely poor, such as 1.1 h after 20% elongation.

The inorganic powder blend enameled wire of Comparative Example 2 has a Vt characteristic (voltage-dielectric breakdown life characteristic) of 15.8 h at the initial value, but 0.60 h after 10% elongation.
After 0% elongation, it is extremely bad at 0.13 h. In addition, in a winding test after 20% elongation due to flexibility, the winding diameter where cracks do not occur is as bad as three times the self-diameter.

The inorganic powder blended enameled wire of Comparative Example 3 had a Vt characteristic (voltage-dielectric breakdown life characteristic) of 14.6 h at the initial value, but 0.40 h after 10% elongation.
After 0% elongation, it is extremely bad at 0.08 h. In addition, in the winding test after 20% elongation due to flexibility, the winding diameter where cracks do not occur is as bad as twice the self-diameter.

The inorganic powder blend enameled wire of Comparative Example 4 had a poor Vt characteristic (voltage-dielectric breakdown life characteristic) of 5.0 h even at the initial value, and 0.15 h after 20% elongation.
After% elongation, it is extremely bad at 0.07 h. In addition, in a winding test after 20% elongation due to flexibility, the winding diameter where cracks do not occur is as bad as three times the self-diameter.

The imide-modified polyester tree of Comparative Example 5 was
The Vt characteristic (voltage-dielectric breakdown life characteristic) is set to 0.1 at the initial value.
It is extremely bad: 70h, 0.68h after 10% elongation, and 0.54h after 20% elongation.

The tris (2-hydroxyethyl) isocyanurate-modified polyesterimide enameled wire of Comparative Example 6 had a Vt characteristic (voltage-dielectric breakdown life characteristic) of 0.52 hours as an initial value and a value of 0.5 after 10% elongation. It is extremely bad at 0.40 h after elongation at 44 h and 20%.

The polyamide-imide enameled wire of Comparative Example 7 had a Vt characteristic (voltage-dielectric breakdown life characteristic) of 0.35 h at the initial value, 0.32 h after 10% elongation, and 0.29 h after 20% elongation. And extremely bad.

On the other hand, the inverter surge enameled wires of Examples 1 to 5 had excellent self-diameter winding diameters at which cracks did not occur in the coating film in a winding test after 20% elongation related to flexibility. In addition, the initial value and the Vt characteristic (voltage-dielectric breakdown life characteristic) after extension are remarkably excellent.

[0090]

The inverter surge enameled wire according to the present invention is remarkably excellent in flexibility, so that it has excellent Vt characteristics (voltage-dielectric breakdown life characteristics) even at an initial value and after stretching.
And is industrially useful.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an inverter surge resistant enameled wire according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing an inverter surge resistant enameled wire according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Copper wire 2 Resin coating layer for general-purpose enamel wires 3 Resin coating layer for specific inorganic powder blend enamel wires 4 Resin coating layer for tough enamel wires

Continued on the front page F term (reference) 5G303 AA06 AB01 AB03 AB12 BA03 CA11 5G305 AA02 AA11 AB01 AB03 AB15 AB17 BA09 BA25 CA11 CA21 CA22 CA24 CC02 CC04 CC05 CC13 CD01 CD06 5G309 CA10 LA06 LA12 MA02 MA03 MA04 MA11

Claims (7)

[Claims] 1. A general-purpose enamel wire resin coating layer is provided immediately above a conductive wire, and 100 parts by weight of a heat-resistant enamel wire resin and an inorganic powder 30 having a particle diameter of 0.1 μm or less are provided on the general-purpose enamel wire resin coating layer. ~ 100 parts by weight, and a resin coating layer for a specific inorganic powder blend enamel wire comprising 0.1 to 30 parts by weight of an affinity agent for the inorganic powder and the resin for a heat resistant enamel wire. Inverter surge resistant enamel wire. 2. The method according to claim 1, wherein the inorganic powder is one or a mixture of two or more selected from silica, titanium oxide, alumina, zirconia, mica, talc, silicon carbide, and silicon nitride. 1. The anti-inverter surge enamel wire described in 1. 3. The anti-inverter surge enamel wire according to claim 1, wherein the affinity agent between the inorganic powder and the resin for a heat-resistant enamel wire is a coupling agent or an alkoxide or a mixture of a coupling agent and an alkoxide. 4. A coupling agent selected from the group consisting of silane compounds, titanium compounds and aluminum compounds.
The anti-inverter surge enameled wire according to claim 1, wherein the wire is a kind or a mixture of two or more kinds. 5. The alkoxide is tetramethoxysilane,
It is one or a mixture of two or more selected from tetraethoxysilane, tetrapropoxytitanium, tetrabutoxytitanium, tetrastearyloxytitanium, tetrabutoxyzirconium, triethoxyaluminum, and trimethoxyaluminum. Item 1. The anti-inverter surge enameled wire according to item 1. 6. A general-purpose enamel wire resin coating layer is provided immediately above a conductive wire, and a heat-resistant enamel resin 100 parts by weight and an inorganic powder 30 having a particle diameter of 0.1 μm or less are provided on the general-purpose enamel wire resin coating layer. A specific inorganic powder blend enamel wire resin coating layer comprising from 0.1 to 100 parts by weight, and 0.1 to 30 parts by weight of an affinity agent for the inorganic powder and the heat-resistant enamel wire resin. An inverter surge resistant enamelled wire characterized in that a tough enamelled resinous coating layer is provided on an upper layer of the enameled resinous coating layer. 7. The anti-inverter surge enamel wire according to claim 6, wherein the resin film layer for a tough enamel wire is a polyamideimide resin film layer.