JP2003031411A - Heat-resistant insulated coil and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strand conductor for heat resistant insulated coils, a heat-resistant insulated coil and its manufacturing method which has high deterioration strength stable for a long time even in a high temperature atmosphere over 300 deg.C. SOLUTION: A first laminated mica tape wound layer 2 is wound without reinforcements to form a strand conductor 3 as a strand insulator on a coil conductor 1 surface, the strand conductor 3 is wound with a winder to form a coil component 4. An adhesive layer 5 is formed on the surface of the coil component 4 and molded. A second laminate mica tape wound layer 6 is formed as a main insulator on the molded component 4 surface and an insulation tape wound layer 7 made of a fiber base is formed on the wound layer 6 to form a heat-resistant insulated coil 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-resistant insulating coil having good insulating properties even when used in a high temperature atmosphere of 300 ° C. or higher, and a method for manufacturing the heat-resistant insulating coil.

[0002]

2. Description of the Related Art Conventionally, as a wire for a heat-resistant insulated coil used at a high temperature of about 400 to 800 ° C., such as an electromagnetic pump for molten metal for sending molten metal from a molten metal tank, a conductor is made of an inorganic material. The thing which the paint was baked is used. However, since this inorganic paint cannot form a very thick inorganic layer, it has a low dielectric breakdown voltage and cannot be used for electric equipment for high voltage. When the wire having a thick inorganic coating layer was subjected to a winding step by a winding machine to manufacture a wire loop, the inorganic coating layer was cracked and could not be used.

As a heat-resistant insulated electric wire, MI cable (trade name of Furukawa Electric Co., Ltd.) is known. This MI cable is a heat-resistant insulated wire having a structure in which magnesium oxide powder is filled between a conductor and a metal sheath. Since this heat-resistant insulated wire has a metal sheath, it requires countermeasures against eddy currents and has a low conductor space factor. Therefore, this heat-insulated wire is unsuitable for a coil of high-voltage electrical equipment having a large current capacity.

In order to solve the above-mentioned problems, a heat-resistant insulating coil for high-voltage equipment has an inorganic insulating tape 42 such as a mica tape 41 having a reinforcing material layer 40 laminated on a conductor 43 as shown in FIG. A wire loop is formed by a wire conductor wound in two layers. That is, this strand conductor is the conductor 43
Then, the mica tape 41 laminated with the reinforcing material layer 40 was wound while applying the inorganic polymer adhesive, and then fired to form the inorganic insulating layer on the surface of the metal conductor. The reinforcing material layer 40 is a ceramic fiber such as alumina or a heat resistant film such as glass.

A heat-resistant insulating coil for high-voltage equipment using such a wire conductor is described in the following documents. This document is disclosed in JP-A-5-198422 and JP-A-7-2.
No. 03646, JP-A-8-23651, JP-A-8-88948, JP-A-8-242563, JP-A-8-279410, and JP-A-9-283.
No. 318, No. 9-308160, No. 10-144539, No. 10-210694.
JP-A-11-206056, JP-A-11-206056
-234934, JP-A-11-234938, JP-A-11-262211, JP-A-11-3
29126, JP-A-2000-173818,
Japanese Patent Laid-Open No. 2000-294061 and the like.

[0006] Such a heat-resistant insulated coil wire for high-voltage equipment, which has such a wire conductor and main insulation, has been used.

[0007]

However, such a conventional heat-resistant insulating wire loop, when used for a long time in a high temperature atmosphere of 300 ° C. or higher, like an electromagnetic pump for molten metal, causes dielectric breakdown and fails. An accident occurred. The present inventor has conducted experiments and studies on the cause of this dielectric breakdown.
It does not occur when used at temperatures below 0 ° C,
It has been found that when used in a high temperature atmosphere of about 300 ° C. or higher for a long time, the metal component of the conductor 43 diffuses into the insulating layer and deteriorates the insulating performance, so that it cannot be used for a long time.

As a measure for preventing the metal diffusion, it is considered that the thickness of the insulating layer is increased in consideration of the metal diffusion, but the electric device is unnecessarily large and is not suitable for practical use. Further, it is conceivable that the insulating layer is made of ceramic, but ceramic is expensive and not suitable for practical use.

Further, as a result of detailed examination, mica tape 41
It has been found that the metal diffusion D is generated in the reinforcing material layer 40 for physically protecting and reinforcing the mica tape 41, although it itself has a good blocking effect on the metal diffusion. Particularly, in an oxidizing atmosphere such as air, the diffusion rate of metal components is high. As a result, the diffusion D of the metal component causes insulation failure between the adjacent conductors 43.

As described above, it is desired to develop a heat-resistant insulating coil which can suppress metal diffusion from the surface of the insulating material and has a stable and high dielectric strength even when used at a high temperature of 300 ° C. or higher. Was there.

The present invention has been made to solve such a conventional demand, and provides a heat-resistant insulating coil and a heat-resistant insulating coil having a high dielectric strength that is stable for a long period of time even in a high temperature atmosphere of 300 ° C. or higher. It is intended to provide a manufacturing method.

[0012]

In order to achieve the above object, the present invention uses a mica having a high heat resistance, an insulating property, and a blocking action against the diffusion of metal, and a laminated mica foil having a large tensile strength is used as an insulating material. As a result, the reinforcing material layer is unnecessary by providing it on the surface of the conductor, and a stable high dielectric strength is obtained for a long period of time.

The grounds for this are not clear, but it is considered that the reason is as follows. Mica has a density of about 2.8 g / cm
^Due to the high and dense structure of ³ , even if the metal component tries to diffuse into the mica layer, it can be prevented. Therefore, by winding the mica layer around the conductor surface, it is possible to avoid dielectric breakdown due to diffusion of the conductor metal even when used in an environment of 300 ° C. or higher.

On the other hand, the density of the inorganic fiber woven fabric used as the reinforcing material layer of the conventional mica tape is 0.6 to 0.8 g / cm ³ , and the density of the inorganic nonwoven fabric is 0.2.
~ 0.3 g / cm ³ Small and easily diffuses metal components,
Eventually, it spreads over a wide area and causes dielectric breakdown (short circuit) between adjacent conductors. Further, since mica has high heat resistance and excellent dielectric breakdown voltage and withstand voltage, it can be used in the vicinity of a conductor having a high electric field, and a long insulation life can be obtained.

The present invention provides a heat resistant insulation coil having the following constitution and a method for manufacturing the heat resistant insulation coil. That is, in the heat-resistant insulating coil according to claim 1, a conductor conductor in which a mica tape is wound around a conductor, a coil component formed by the coil conductor, and an integrated mica provided on the surface of the coil component. It is characterized by comprising a tape coating and an insulating layer made of an inorganic fiber base material provided on the surface of the assembled mica tape coating.

According to the first aspect of the present invention, 300 ° C. or higher 8
Even in a high temperature atmosphere of about 00 ° C., diffusion of a conductor metal component can be prevented, and a mica tape having no reinforcing material can be wound to obtain a heat-resistant insulating wire loop having high insulation strength that is stable for a long period of time.

According to a second aspect of the present invention, there is provided the heat resistant insulation coil according to the first aspect, wherein the conductor is a stainless clad copper wire, a nickel base alloy clad copper wire or an iron base alloy clad copper wire. To do.

According to the second aspect of the invention, the temperature is 300 ° C. or higher and 8
Even in a high temperature atmosphere of about 00 ° C., diffusion of the metal from the conductor can be suppressed by the clad, and a heat-resistant insulating coil having a high long-term stable dielectric strength can be manufactured.

According to a third aspect of the present invention, there is provided the heat-resistant insulating coil according to the first aspect, wherein the insulating layer is a woven tape or a non-woven tape.

According to the third aspect of the present invention, since the outer periphery of the wire wheel component is covered with the woven tape or the non-woven tape, the mica tape is not separated due to impact or the like, and the electrical insulation is stable for a long time in a high temperature atmosphere. Can form proof stress.

According to a fourth aspect of the present invention, there is provided a method for manufacturing a heat-resistant insulating coil, which comprises a step of forming a conductor for a coil by winding a mica tape on the surface of the conductor to form a conductor for the coil, and A loop forming step of forming a loop, an insulator forming step of winding a laminated mica tape composed of an inorganic adhesive and a laminated mica foil on the surface of the loop, and an inorganic fiber having no adhesive on the insulator. It is characterized by comprising an insulating coating body forming step of winding an insulating tape made of a base material and a firing step of firing at a temperature of 300 ° C. or higher after the insulating coating body forming step.

According to the invention of claim 4, 300 ° C. or higher 8
Even in a high temperature atmosphere of about 00 ° C., it is possible to manufacture a heat-resistant insulating coil having a high dielectric strength that is stable for a long period of time.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a heat resistant insulation coil according to the fourth aspect, wherein in the step of forming a conductor for a wire ring, a plurality of mica foil laminated sheets are bonded with an inorganic adhesive. It is characterized in that it is a step of winding a mica tape formed of.

According to the fifth aspect of the present invention, since the laminated mica foil having higher mechanical strength than the ordinary laminated mica foil is used, the tensile strength is large and the conductor surface can be coated without forming the reinforcing material. it can.

According to a sixth aspect of the present invention, there is provided a method of manufacturing a heat resistant insulation coil according to the fourth aspect, wherein the step of forming the insulator comprises winding the laminated mica tape while applying an inorganic paint. And

According to the sixth aspect of the invention, since the mica tape assembly is wound while applying the inorganic coating material, a strong insulating layer can be formed.

In the heat-resistant insulating coil of the present invention, the mica tape composed of only the mica foil and the inorganic adhesive is brought into contact with the outer peripheral surface of the wire conductor without using a reinforcing material layer such as ceramic fiber. After winding, and further winding an insulating tape made of an inorganic fiber base material having no adhesive on the outer periphery of the assembled mica tape, the inorganic adhesive is fired at a high temperature of 300 ° C. or higher.

The mica tape includes peeled mica tape,
There are mica tapes and mica tapes obtained by bonding a plurality of laminated mica foils with an inorganic adhesive. The laminated mica tape is wound by applying an inorganic adhesive or an inorganic coating material and firing at a high temperature of 300 ° C or higher,
The assembled mica tapes may be solidified together.

As the mica tape having no reinforcing material layer, the mica laminated is impregnated with an inorganic adhesive and heated moderately to be semi-cured. Generally, in high temperature mica tape, tensile strength is secured by using a ceramic fiber or the like for the reinforcing material layer so that the coil winding work can be performed. In the present invention, the reinforcing material layer is unnecessary by using the laminated mica foil (sheet) having a large tensile strength.

The reason why the laminated mica tape having no reinforcing material layer is used is that it has a function of suppressing diffusion of the conductive metal into the insulating layer. Diffusion of metal from conductor is 300 ℃
Occurs at a high temperature of 400 ° C. or higher. The laminated mica tape may be peeled mica pasted with an inorganic adhesive and can be appropriately selected. Peeled mica is also called flake mica. "Mica flakes peeled from a block or symmicica to a uniform thickness, with 10 stacked layers with a thickness of 0.28 mm or less, and a size of 1.7c.
Those of m ² or more are generally used. ”

The integrated mica is obtained by crushing peeled mica, making this mica powder into an aqueous solution, and filtering it into a paper form.
Further, soft mica has a higher water of crystallization water release than hard mica and is excellent in heat resistance, and is particularly advantageous when used at about 800 ° C. or higher. The laminated mica tape layer has excellent electrical characteristics but is slightly inferior in mechanical strength.Therefore, an insulating tape made of a heat-resistant inorganic fiber base material with high mechanical strength is wound on the laminated mica tape layer. It is possible to prevent the assembled mica tape layer from collapsing by covering it with a coating and pressing the assembled mica tape layer.

Since the insulating tape made of the inorganic fiber base material is not coated with the adhesive, the thermal stress due to the heat cycle can be absorbed by the deformation.
Therefore, the insulating tape made of inorganic fiber base material
It is not cut by the thermal stress caused by the heat cycle.
Since the insulating tape made of an inorganic fiber base material has a low density, the density is such that metal diffusion occurs at about 300 ° C. or higher, but the diffusion of the conductive metal is blocked by the mica insulating layer, so that the conductive metal diffusion is blocked. No action required. Therefore, the function of the insulating tape made of the inorganic fiber base material is to provide mechanical and physical protection to prevent the assembled mica tape layer from breaking apart.

The inorganic adhesive is preferably an inorganicized silicone which is made inorganic by firing at a high temperature. Further, the inorganic adhesive is, for example, an alkyl silicate type silicone AY49-208 (trade name of Toray Dow Corning Co., Ltd.), a borosiloxane resin SMR-109 (trade name of Showa Densen Co., Ltd.), a methylphenyl type TSR-117 silicone. (GE / Toshiba Silicone Co., Ltd. product name).

In addition to the above-mentioned inorganic adhesives, inorganic coating materials include phosphates such as aluminum monophosphate and silicon phosphate,
Examples include colloidal silica and colloidal alumina. Winding the mica tape around the conductor surface while applying an inorganic adhesive or an inorganic paint and firing it will bond between the conductor and the mica tape and between the mica tapes together, forming a strong insulating layer. be able to.

To wind the laminated mica tape around the conductor surface without applying an inorganic adhesive or an inorganic coating material and to bake it, only the adhesive originally contained in the laminated mica tape is used to partially bond the laminated mica tapes to each other. Will be in a state of Such a laminated mica tape winding layer has an advantage that it can absorb thermal stress generated by a heat cycle associated with the operation / stop of an electric device by shifting the mica layer. Whether or not the inorganic adhesive is applied at the time of winding the laminated mica tape is determined in consideration of the required performance for the heat cycle characteristics of the electric device.

The insulating tape made of an inorganic fiber base material having no adhesive is made of alumina, alumina, boria,
Woven cloth, non-woven cloth, spun cloth, or the like in which fibers having heat resistance and high mechanical strength such as silica (for example, Nextel under the trade name of 3M Co., USA), silica, and glass are used.
The non-woven inorganic insulating tape is preferably woven with a high fiber density in order to improve the thermal conductivity of the insulating layer. Since the insulating tape winding layer made of an inorganic fiber base material needs mechanical strength, a relatively thick tape of about 100 to 500 μm is suitable.

The conductor metal is, for example, copper, copper-nickel alloy, silver, stainless steel clad copper wire, nickel base alloy clad copper wire, iron base alloy clad copper wire or the like. Clad copper wire reduces metal diffusion.

[0038]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the heat resistant insulation coil and the method for manufacturing the heat resistant insulation coil of the present invention will be described with reference to FIGS.

Embodiment-1 Next, a first embodiment will be described with reference to FIG. This embodiment is an embodiment in which the wire insulator and the present insulator are made of laminated mica. The conductor 1 for a coil has a rectangular cross section made of nickel-plated copper to avoid corrosion. On the surface of the conductor 1 for a wire loop, a first mica tape winding layer 2 around which a mica tape assembly is wound is provided as a wire insulation. The first laminated mica tape winding layer 2 is for avoiding diffusion of the metal of the conductor 1 during use at a temperature of 400 ° C. or higher to cause insulation failure.

This first mica tape winding layer 2 is
0.20 m thick with multiple high-strength, soft, non-fired, laminated mica sheets bonded together with silicone as an adhesive
1 m of laminated mica tape on conductor 1
It is a wound layer. In this way, the wire conductor 3 is formed.

That is, on the inner side in contact with the conductor 1, there is provided a first laminated mica tape winding layer 2 which does not use a reinforcing material layer and is excellent in electric characteristics and heat resistance. Strand conductor 3
Is coiled into a pancake by a coil winding machine to form the coil component 4. FIG. 1 is a sectional view showing a state in which the winding process is performed. After forming the coil component 4, the coil component 4
Alkyl silicate-based mineralized silicone (AY49-20 manufactured by Toray Dow Corning Silicone Co., Ltd.)
8) or an inorganic adhesive layer 5 such as alumina is applied.
The coil component 4 coated with the adhesive layer 5 is molded.

On the surface of the molded and processed wire ring component 4, a mica tape coating body, such as mechanical strength, is provided as main insulation.
No.2 wrapped with laminated mica tape with excellent heat resistance
The mica tape winding layer 6 is provided. The second laminated mica tape winding layer 6 is formed by laminating a high-strength soft unbaked laminated mica foil with silicone as an adhesive, and a laminated mica tape having a thickness of 0.30 mm, for example, while applying inorganicized silicone to the wire ring. It is a layer formed by winding the surface of the component 4 by ½ lap winding three times.

An insulating tape winding layer 7 made of an inorganic fiber base material having no adhesive is provided on the second mica tape winding layer 6. The insulating tape winding layer 7 is an insulating tape made of an inorganic fiber base material having no adhesive, and an insulating tape made of alumina fiber having a thickness of 0.32 mm having no adhesive is used as a second mica tape winding layer. 6 is a layer which is wound once by 1/2 lap winding.

On the insulating tape winding layer 7, a releasing polytetrafluoroethylene tape (not shown) is wound, and in a state where an iron plate is applied to the wound polytetrafluoroethylene tape, Further, the heat-shrinkable polyester tape is wound. These wound coil components are heated and cured at a temperature of, for example, 150 ° C. for a time of, for example, 5 hours.

After that, the heat-shrinkable polyester tape, the iron plate, and the polytetrafluoroethylene tape for release are removed. The wire is fired in air at a temperature of, for example, 600 ° C. for 6 hours, and in oxygen at 600 ° C. for 2 hours. In this way, the heat resistant insulating coil 8 is manufactured.

In the above manufacturing process, the pressurization at the time of heat curing is performed by the heat shrinkage of the heat shrinkable polyester tape. Furthermore, the organic component contained in the insulating layer was gasified and disappeared to become inorganic (ceramic) by heating and baking at a high temperature, and a completely inorganic insulating layer was formed.

Comparative Example 1 Next, Comparative Example 1 will be described with reference to FIG. Comparative Example 1 is for comparison with Embodiment 1 described above, and is an example in which the first and second assembled mica tape winding layers 2 and 6 are configured by a mica tape winding layer with a reinforcing material.

That is, the conductor 11 for a rectangular wire having a rectangular wire shape made of nickel-plated copper has the first laminated mica tape winding layer 12 with a reinforcing material wound with a mica tape with a reinforcing material. It is provided. The first laminated mica tape winding layer 12 is a laminated mica tape with a reinforcing material in which a silica cloth having a thickness of 0.05 mm and a soft unfired laminated mica sheet having a thickness of 0.10 mm are bonded with silicone as an adhesive. Is a layer obtained by winding the conductor 11 around the conductor 11 once by ½ lap winding. In this way, the wire conductor 13 is formed.

The wire conductor 13 is wound in a pancake shape by a coil winding machine to form a coil part 14. After forming the wire ring component 14, the surface of the wire ring component 14 is coated with an inorganic adhesive layer 15 such as an alkyl silicate-based inorganicized silicone (Toray Dow Corning Silicone product AY49-208) or alumina. . The wire wheel component 14 to which the adhesive layer 15 is applied is molded.

On the surface of the molded wire ring component 14,
A second laminated mica tape winding layer 16 with a reinforcing material is provided, around which a laminated mica tape with a reinforcing material, which is reinforced with a lining, is wound. The second laminated mica tape winding layer 16 is a laminated mica tape with a reinforcing material in which alumina woven fabric having a thickness of 0.10 mm is lined and reinforced with unfired soft laminated mica having a thickness of 0.15 mm while applying inorganicized silicone. It is a layer wound on the surface of the coil part 14 three times by ½ lap winding.

Further, the second laminated mica tape winding layer 16
An inorganic insulating tape winding layer 17 is provided on the surface of the. As the insulating tape winding layer 17, an insulating tape made of alumina fiber having no adhesive and having a thickness of 0.32 mm was wound around the surface of the second mica tape winding layer 16 once by ½ lap winding. It is a layer. Thereafter, the insulating layer made of a completely inorganic fiber base material was formed through the manufacturing processes of curing and baking similar to those in Embodiment-1.

That is, a polytetrafluoroethylene tape (not shown) for releasing is wound on the insulating tape winding layer 17. The release-molded polytetrafluoroethylene tape is wound with a heat-shrinkable polyester tape while the iron plate is applied. In this state, it is heated at a temperature of 150 ° C. for 5 hours to be cured. After that, the heat-shrinkable polyester tape, the iron plate, and the polytetrafluoroethylene tape for releasing the mold were removed, and the wire was heated in air at 600 ° C. for 6 hours and in oxygen at 600 ° C. for 2 hours.
Bake for hours. In this way, the heat resistant insulation coil 18 is manufactured.

With respect to the heat-resistant insulating wire rings 8 and 18 thus manufactured, the following dielectric breakdown evaluation was performed.
The content of this evaluation is an electric life test in which the heat-resistant insulating wire rings 8 and 18 obtained in Embodiment 1 and Comparative Example 1 were set in a hot air circulation type high temperature tank.

In preparation for the experiment, a silver foil electrode (not shown) is wound around the surfaces of the heat-resistant insulating coils 8 and 18 for charging.
The heat-resistant insulating wire rings 8 and 18 around which the silver foil electrodes are wound are carried into a high temperature tank at a temperature of 800 ° C. in an atmosphere filled with nitrogen gas. In the heat-resistant insulating coils 8 and 18 that have been carried in, an alternating voltage of 2.5 kv (effective value) is continuously applied between the conductors 1 and 11 and the silver foil electrodes on the surfaces of the heat-resistant insulating coils 8 and 18, respectively. . In this state, the time until dielectric breakdown was observed as the voltage application life.

As a result, the first and second laminated mica tape winding layers 1 in which the alumina woven fabric of Comparative Example 1 was backed and reinforced
The heat-resistant insulating coil 18 on which the insulating layer was formed with Nos. 2 and 16 had a dielectric breakdown in an average of 305 hours. In contrast, the embodiment-
The insulating coil 8 composed of the first and second laminated mica tape winding layers 2 and 6 which did not use the reinforcing material of 1 did not lead to dielectric breakdown even when the voltage was applied for 2,000 hours. As described above, according to the voltage application life experiment, the voltage application life of Comparative Example 1 was shorter than that of the first embodiment, because the metal element diffuses into the insulating layer and the apparent insulation thickness is reduced. This is because

After the end of the experiment, the metal in the insulating layers of the first and second laminated mica tape winding layers 2, 6, 12, 16 was analyzed by an X-ray microanalyzer (WDS) for each heat-resistant insulating wire ring 8, 18. The distribution of elements was investigated. as a result,
In the heat resistant insulation coil 18 of Comparative Example 1, the copper element was diffused to about 1/3 of the insulation thickness, which proves that the apparent insulation thickness is reduced.

Further, it was confirmed that the copper element of the conductor 11 was diffused into the insulating layer through the silica cloth and the alumina woven cloth which are the reinforcing materials of the first laminated mica tape winding layer 12. That is, there was almost no diffusion of copper element into the first laminated mica tape winding layer 12 alone.

On the other hand, in the heat-resistant insulating coil 8 of Embodiment-1, almost no diffusion of copper element was observed in the insulating layer of the first mica tape winding layer 2. Further, the silver element of the silver foil electrode wound around the surface of the heat-resistant insulating coil 8 was confirmed in the insulating tape winding layer 7 made of alumina fiber. The first and second laminated mica tape winding layers 2 and 6 which do not use the reinforcing material are the conductor 1 in which the silver element of the silver foil electrode does not reach.
The metal diffusion in a high temperature atmosphere of 300 ° C. or higher was suppressed.

Embodiment-2 This embodiment is an example in which the wire insulator of Embodiment-1 is peeled off and made of mica. Since this embodiment is for evaluating dielectric breakdown due to metal diffusion of the conductor 21,
It is evaluated in the state of the wire conductor without forming the wire ring.

The conductor 21 for the wire ring is made of copper plated with nickel to prevent corrosion, and has a rectangular cross section with a size of, for example, 12 mm × 12 mm and a length of, for example, 300 mm.
Is. On the surface of the conductor 21, a peeling mica tape winding layer 22 is provided on the inner side in contact with the conductor 21, which does not use a reinforcing material and has excellent electrical characteristics and heat resistance. The peeling mica tape winding layer 22 is in use at a temperature of 400 ° C. or higher. In order to prevent the metal of the conductor 21 from diffusing and causing insulation failure, peeling mica tape such as soft peeling mica tape is wound as the wire insulation. It is a layer.

The peeled mica tape winding layer 22 is a layer in which peeled mica tape having a thickness of 0.20 mm, for example, is 1 / 2-lapped and wound, for example, once and bonded with a silicone adhesive. In this way, the heat-resistant insulated coil wire conductor 23 is formed. Peeling mica tape winding layer 22
The upper part is a mica tape covering body as an insulator, for example, a high-strength soft unbaked laminated mica sheet tape having excellent mechanical strength and heat resistance is wound, and a soft unbaked laminated mica sheet tape is wound. A layer 24 is provided. The laminated mica sheet tape winding layer 24 has a thickness of 0.30 m by laminating the laminated mica sheet with silicone as an adhesive.
It is a layer obtained by winding the mica tape-shaped mica tape of m in 3 times with 1/2 overlap winding while applying the inorganicized silicone.

Further, on the laminated mica sheet tape winding layer 24, there is provided an insulating tape winding layer 25 around which an insulating tape made of an inorganic fiber base material having no adhesive is wound. This insulating tape winding layer 25 is a layer obtained by winding an insulating tape made of alumina fiber having a thickness of 0.32 mm and having no adhesive agent once by ½ lap winding. A releasing polytetrafluoroethylene tape (not shown) is wound around the insulating tape winding layer 25 thus formed, and an iron plate is applied to the wound polytetrafluoroethylene tape. In this state, the heat-shrinkable polyester tape is wound. In this state, the temperature of the wire loop is 150 ° C,
It is cured by heating for 5 hours.

After that, the heat-shrinkable polyester tape, the iron plate, and the polytetrafluoroethylene tape for release are removed. After that, the wire ring is fired in air at a temperature of 300 ° C. or higher, for example 600 ° C., for a time of 6 hours, and further, in an oxygen atmosphere at a temperature of 300 ° C. or higher, for example 600 ° C.
Baking is performed at ℃ for 2 hours. Thus, the heat resistant insulation coil 26 was manufactured.

In the heat-resistant insulating wire ring 26 fired at a temperature of 300 ° C. or higher, the silicone adhesive is organic. An effect of suppressing the diffusion of the metal element can be obtained. Through such curing and firing manufacturing processes, an insulating tape winding layer made of a completely inorganic fiber base material was formed.

Comparative Example 2 Next, Comparative Example 2 will be described with reference to FIG. Comparative Example 2 is for comparison with Embodiment 2 described above, and is an example in which a peeling mica tape winding layer 22 is replaced by a mica tape winding layer with a reinforcing material.

That is, a laminated mica tape winding layer 32 with a reinforcing material is provided on the surface of the conductor 31 for a coil, around which a laminated mica tape with a reinforcing material for reinforcing the backing is wound. The laminated mica tape winding layer 32 with a reinforcing material is a laminated mica tape with a reinforcing material obtained by backing and reinforcing a 0.10 mm thick alumina woven cloth with a 0.15 mm thick unfired soft laminated mica. 1 / while applying Toray Dow Corning Silicone product AY49-208)
It is a layer that is wound four times in two layers. In this way, the heat resistant insulated coil wire conductor 33 is formed.

An insulating tape winding layer 34 made of a fiber base material is wound on the reinforcing mica tape winding layer 32 of the wire conductor 33. This insulating tape winding layer 34
Is a layer obtained by half-wrapping an insulating tape made of alumina fiber having a thickness of 0.32 mm, which has no adhesive, and winding it once. This insulating tape winding layer 34 will be described in the following embodiment-
Processing is performed in the same manner as 1.

Insulating tape winding layer 1 thus formed
A releasing polytetrafluoroethylene tape (not shown) is wound on the outer side of 0 in the same manner as in Example 1, and a heat-shrinkable polyester tape is further wound with the iron plate applied. In this state, it is cured by heating at a temperature of 150 ° C. for 5 hours. After that, the heat-shrinkable polyester tape, the iron plate, and the polytetrafluoroethylene tape for release are removed.

After this, the wire loop is heated in air at a temperature of, for example, 60.
It is fired at 0 ° C. for a time of, for example, 6 hours, and then further fired in an oxygen atmosphere at a temperature of, for example, 600 ° C. for a time of, for example, 2 hours. In this way, the heat resistant insulation coil 35 is manufactured. The laminated mica tape winding layer 32 and the insulating tape winding layer 34 with the reinforcing material are manufactured through such curing and firing manufacturing processes.
Is formed in an insulating tape winding layer made of a completely inorganic fiber base material.

Heat-resistant insulating wire ring 2 manufactured in this way
Evaluation of dielectric breakdown of Nos. 6 and 35 was performed. That is, the heat-resistant insulating coils 26 and 35 manufactured according to Embodiment 2 and Comparative Example 2 were set in a hot air circulation type high temperature tank and subjected to a heat deterioration test.

In this heat deterioration experiment, the heat-resistant insulating wire loops 26 and 35 were carried into a high temperature tank of 800 ° C. in an air atmosphere,
This is an experiment for measuring the dielectric breakdown voltage after heating for 1,000 hours. When the dielectric breakdown voltage after heating for 1,000 hours was expressed as a relative value with respect to the initial value, it was 95% in the embodiment-2 and 63% in the comparative example 2.

The main cause of the decrease in the dielectric breakdown voltage of Comparative Example 2 is that the copper, which is the material of the conductor 31, is oxidized in high temperature air to increase its bulk, and the gap between the reinforcing mica tape winding layers 32 is increased. This is because the copper element invades and diffuses through the alumina woven cloth that is the reinforcing material for the mica tape.

On the other hand, in the heat-resistant insulating coil 26 of the embodiment 2, since the peeling mica tape winding layer 22 having high mechanical strength at high temperature is provided on the surface of the conductor 21, copper oxide penetrates. In addition, since the peeling mica tape winding layer 22 does not use a reinforcing material, the copper element is difficult to diffuse.

Further, as a result of observing the cross section by cutting the heat resistant insulation coiled wires 26, 35, the heat resistant insulation coiled wire 26 of Embodiment-2 is shown.
Even if the cross-sectional area of copper increases due to oxidation, the peeled mica tape winding layer 22 is not destroyed, and the laminated mica sheet tape winding layer 24 wound on the peeling mica tape winding layer 22 is also firm. It was

However, the heat resistant insulation coil 35 of Comparative Example 2 is
Copper oxide was partially absorbed in the reinforcing mica tape winding layer 32. The insulation of the wire conductor 33 is easily affected by the diffusion of the conductor metal because the reinforcing mica tape winding layer 32 is wound directly around the conductor 31.

From the description of the above embodiment, the peeling mica tape winding layer 22 without the reinforcing material layer or the first laminated mica tape winding layer 2 is wound around the conductors 1, 21 or the conductors 1, 21.
By interposing and interposing between them, there is an effect of suppressing the diffusion of the metal element. Heat-resistant insulating wire ring 1 of Comparative Example 1 and Comparative Example 2
As can be seen from the performance evaluation experiment results of Nos. 8 and 35, the heat-resistant insulating wire loop 18 including the first mica tape winding layer 12 using the inorganic fiber reinforcing material and the laminated mica tape winding layer 32 with the reinforcing material, In No. 35, the metal oxide of the conductors 11 and 31 diffuses through the reinforcing material, so that the insulation performance deteriorates. Therefore, as can be seen from the performance evaluation experiment results of the first and second embodiments, the insulation of the wire conductors 13 and 33 is achieved by winding the first laminated mica tape winding layer or the peeling mica tape without the reinforcing material, or Good to insert between conductors.

In the above embodiment, an example in which the wire insulator and the present insulator are changed has been described, but an embodiment in which the material of the conductor is replaced with another material will be described next.

When a stainless steel clad copper wire was used as the conductors 1 and 21 of the wire conductor, the dielectric breakdown was evaluated at a temperature of 8
Heat-resistant insulation wire ring 8 in a high-temperature tank in an air atmosphere of 00 ° C,
26 was set. As a result, even after heating for 1,000 hours, the oxidation of the conductor was small, the bulk of the conductor did not increase like copper, and the cross-sectional area hardly changed.

Therefore, if the wire conductors 3 and 23 are coated around copper or a copper alloy (alumina dispersion strengthened copper or the like) with copper or a metal having a higher heat resistance than the copper alloy, the electrical conductivity at a higher temperature becomes higher. A conductor with little oxidative deterioration can be obtained. Further, it has been found that the wire conductors 3 and 23 can be used even in an oxidizing atmosphere at 300 ° C. or higher.

A specific example of the SUS clad copper wire is a stainless steel plate (for example, SUS304 or SUS316) having a thickness of 0.8 mm and a width of 50 mm, and a 6.2 mmφ oxygen-free copper wire is produced by a pipe making machine. While enclosing the copper wire, both ends of the stainless steel plate are welded by arc welding, and the encased product is drawn to 1.3 mmφ. The SUS clad copper wire thus formed has a thickness of a stainless steel plate, which is a coating metal, of 0.13.
In mm, a tightly adhered SUS clad copper wire having an oxygen-free copper wire diameter of 1.04 mmφ is obtained.

As the other coating metal, nickel, titanium, niobium, iron and their base alloys can be used, and the diffusion of the metal at high temperature can be reduced. With respect to the cross-sectional shape of the conductor, similar effects can be obtained even with a conductor having a circular cross-sectional shape, which has been described in the example of the rectangular cross section.

In the above embodiment, the operating temperature range of the heat resistant insulation coil has been described as approximately 300 to 800 ° C. The reason why 300 ° C. is the temperature at which the influence of metal diffusion begins to occur, and 800 ° C. The above-mentioned characteristic evaluation test results and the heat-resistant temperature of the soft mica which is a constituent material of the heat-resistant insulating coil are 9
Since the temperature is 70 ° C (published by The Institute of Electrical Engineers of Japan: from the Electrical Engineering Handbook), the margin is taken into consideration.

[0083]

As described above, according to the present invention, a mica tape having no electric reinforcement and excellent heat resistance is wound around the inside of the conductor in contact with the conductor, and then the mechanical tape is mechanically applied. Since the insulating layer made of an inorganic fiber base material with excellent strength and heat resistance is provided, it is possible to prevent the conductor metal from diffusing into the insulating layer even in a high temperature atmosphere exceeding 300 ° C. A heat-resistant insulated wire ring that is mechanically excellent can be obtained. Furthermore, the electrical insulation performance can be maintained for a long time with almost no deterioration in performance even when used at high temperature for a long time.

[Brief description of drawings]

FIG. 1 is a sectional view for explaining an embodiment of a heat resistant insulation coil of the present invention.

FIG. 2 is a cross-sectional view of a heat resistant insulation coil for comparison with the heat resistant insulation coil of FIG.

FIG. 3 is a sectional view for explaining another embodiment of FIG.

FIG. 4 is a cross-sectional view for explaining another comparative example of FIG.

FIG. 5 is a cross-sectional view for explaining a conductor metal diffusion state of a conventional heat resistant insulation coil.

[Explanation of symbols]

1, 21 ... Conductor, 2 ... First mica tape winding layer,
3, 23 ... Element conductors, 4 coil parts, 5 ... Adhesive layer, 6 ...
Second laminated mica tape winding layer, 7, 25 ... Insulating tape winding layer, 8, 26 ... Heat-resistant insulating wire, 22 ... Peeling mica tape winding layer, 24 ... Integrated mica sheet tape winding layer.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshie Aizawa             8th Shinsugita Town, Isogo Ward, Yokohama City, Kanagawa Prefecture             Ceremony company Toshiba Yokohama office F-term (reference) 5G309 LA01 LA07 PA02                 5G315 CA02 CB01 CB02 CC01 CC08                       CD11

Claims (6)

[Claims] 1. A wire conductor in which a mica tape is wound around a conductor, a wire wheel component formed of this wire wire conductor, an assembled mica tape coating provided on the surface of the wire wheel component, and this assembly. A heat-resistant insulating coil, comprising an insulating layer made of an inorganic fiber base material provided on the surface of a mica tape coating. 2. The heat resistant insulated coil wire according to claim 1, wherein the conductor is a stainless clad copper wire, a nickel base alloy clad copper wire or an iron base alloy clad copper wire. 3. The heat-resistant insulating wire loop according to claim 1, wherein the insulating layer is a woven tape or a non-woven tape. 4. A wire conductor forming step of winding a mica tape around a conductor surface to form a wire conductor; a wire forming step of winding the wire conductor to form a wire ring; An insulator forming step of winding a laminated mica tape composed of an inorganic adhesive and a laminated mica foil on the surface, and an insulating coating body winding an insulating tape made of an inorganic fiber base material having no adhesive on the insulator A method for manufacturing a heat resistant insulation coil, comprising: a step of firing and a firing step of firing at a temperature of 300 ° C. or higher after the step of forming the insulating coating. 5. The heat resistant insulated wire according to claim 4, wherein the strand conductor forming step is a step of winding a laminated mica tape obtained by bonding a plurality of laminated mica sheets with an inorganic adhesive. Ring manufacturing method. 6. The mica tape is wound while applying an inorganic paint in the insulator forming step.
A method for manufacturing the heat-resistant insulated wire described.