WO2015121999A1 - Insulated wire, rotary electric machinery, and method for producing insulated wire - Google Patents

Abstract

The present invention addresses the problem of providing an insulated wire having excellent heat resistance and pressure resistance, and a rotary electric machine that uses the same. This insulated wire has an insulating resin layer formed around the outer periphery of a conductor. The insulating resin layer comprises a thermoplastic phenoxy resin and a crosslinking agent, and the phenoxy resin has a bisphenol A-type skeleton and a bisphenol F-type skeleton.

Description

Insulated wire, rotary electric machine, and method of manufacturing insulated wire

The present invention relates to an insulated wire.

At present, further miniaturization and higher output of rotary electric machines such as drive motors used for household electric appliances, industrial electric appliances, ships, railways, electric vehicles and the like are being promoted.

In order to achieve downsizing and high output of the rotating electrical machine, it is necessary to increase the density and space ratio of the windings of the rotating electrical machine. However, when increasing the density of the windings, the self-heating of the windings and adjacent windings It is necessary to prevent the dielectric breakdown caused by the partial discharge between the lines. Further, also in inverter control, the application of which to a driving motor is expanding, it is necessary to prevent dielectric breakdown caused by a surge voltage generated by switching.

Therefore, more excellent heat resistance and voltage resistance (hereinafter referred to as pressure resistance) are required for the insulating resin used for the insulated wire as a winding.

Therefore, Patent Document 1 discloses a self-bonding enameled wire in which an insulating material is applied and baked on a conductor, and a fusion layer is formed on the conductor, from the viewpoint of reducing the number of steps by impregnating varnish-less. Patent Document 2 discloses a DC power cable in which an insulator layer is formed by extrusion coating on the outer periphery of a conductor using an extruder.

JP 2012-87246 A JP, 2009-114267, A

By covering the outer periphery of the conductor with a resin material excellent in heat resistance, the heat resistance of the insulated wire can be secured. However, in general, not only heat resistance but also various properties such as pressure resistance, mechanical strength, chemical stability, water resistance and moisture resistance are required of the insulated wire. In particular, in order to secure the pressure resistance of the winding, it is necessary to coat the conductor with a film thickness of a certain degree or more.

As disclosed in Patent Document 1, in order to form the insulating resin layer having a sufficient film thickness on the insulated wire by the coating and baking steps, the coating and baking steps need to be repeated many times, and the manufacturing cost is high. Problem of becoming

On the other hand, as in Patent Document 2, in order to manufacture an insulated wire by a method using an extruder, the temperature at which the material is heated prior to extrusion molding is thermally cured at the coating portion on the insulated wire after extrusion molding It must be lower than the temperature. However, the enameled wire of Patent Document 1 has a sulfone group-containing polyhydroxy polyether resin obtained by copolymerizing a bisphenol A epoxy unit and a bisphenol S epoxy unit, and this enameled wire has a melting temperature of 200 ° C. Since it is too high and it can not manufacture with the method using the extruder of patent document 2, it can not manufacture.

An object of the present invention is to provide an insulated wire excellent in heat resistance and pressure resistance and a rotary electric machine using the same.

In the insulated wire according to the present invention, an insulating resin layer is formed on the outer periphery of the conductor, and the insulating resin layer has a thermoplastic phenoxy resin and a crosslinking agent.

According to the present invention, an insulated wire excellent in heat resistance and pressure resistance can be provided.

It is an explanatory view showing an example of the electric insulated wire concerning the present invention. It is an explanatory view showing an example of the electric insulated wire concerning the present invention. It is an explanatory view showing an example of the electric insulated wire concerning the present invention. It is explanatory drawing of the rotary electric machine which concerns on this invention. It is explanatory drawing of the manufacturing method of the insulated wire which concerns on this invention.

Hereinafter, an insulated wire according to an embodiment of the present invention and a rotating electrical machine using the same will be described in detail.

The insulated wire according to the present embodiment mainly includes a conductor and an insulating resin layer. This insulated wire is suitable for the winding of a rotating electrical machine, and is an insulated wire that can be used in a high density environment where the wires are in close contact with each other by being wound.

The conductor according to the present embodiment is a linear conductor similar to the core wire of a general insulated wire, and is formed of a copper wire, an aluminum wire, an alloy wire thereof, or the like.

The copper wire may be made of any of tough pitch copper, oxygen free copper and deoxidized copper, and may be any of soft copper wire and hard copper wire. Moreover, the plating copper wire by which tin, nickel, silver, aluminum, etc. were plated on the surface may be sufficient.

The aluminum wire may be any of hard aluminum wire, semi-hard aluminum wire and the like. Also, as alloy wires, copper-tin alloy, copper-silver alloy, copper-zinc alloy, copper-chromium alloy, copper-zirconium alloy, aluminum-copper alloy, aluminum-silver alloy, aluminum-zinc alloy, aluminum-iron alloy And aluminum alloy (Aldrey Aluminum).

The shape of the conductor according to the present embodiment may be either a round wire having a circular cross section or a flat wire having a rectangular cross section. Moreover, any of a single wire formed of one conductor and a stranded wire formed by twisting a plurality of conductors may be used.

The insulating resin layer according to this embodiment is characterized by using a thermoplastic phenoxy resin having a bisphenol A skeleton and a bisphenol F skeleton. As a phenoxy resin having a bisphenol A skeleton and a bisphenol F skeleton, “YP-70” (Toto Kasei Co., Ltd.) can be used. The phenoxy resin may be an acrylic modified phenoxy resin or a vinyl modified phenoxy resin. Acrylic modification is 1 type of vinyl modification.

In the insulating resin layer according to the present embodiment, the main component (50% by weight or more of the entire insulating resin layer as a whole) is made of a thermoplastic resin and crosslinked by heat treatment after the extrusion process. Therefore, after the extrusion process and before the heat treatment, it does not flow. In this non-flowing state, the insulating resin layer has self-bonding properties. The insulating resin layer is converted to a thermosetting resin by crosslinking, and the heat resistance is improved.

As a thermoplastic resin which the insulating resin layer which concerns on this embodiment contains, a phenoxy resin is preferable. Moreover, as a crosslinking agent for crosslinking a thermoplastic resin, a bismaleimide compound, an epoxy compound, and block isocyanate are mentioned. In addition, when using an epoxy compound as a crosslinking agent, it is preferable to contain an imidazole as a catalyst.

As the epoxy compound, bisphenol A type epoxy resin “grade name: 828” or “grade name: 1001” “grade name: 1004” “grade name: 1007” (manufactured by Japan Epoxy Resins Co., Ltd.) can be used.

Examples of blocked isocyanates include Duranate series "17B-60P" and "TPA-B80E" (manufactured by Asahi Kasei Chemicals Corporation).

As the bismaleimide compound, 4,4'-diphenylmethane bismaleimide "BMI-1000" (made by Daiwa Kasei Kogyo Co., Ltd.), polyphenylmethane maleimide "BMI-2000" (made by Daiwa Kasei Kogyo Co., Ltd.), m-phenylene bis Maleimide "BMI-3000" (manufactured by Daiwa Kasei Kogyo Co., Ltd.), bisphenol A diphenyl ether bismaleimide "BMI-4000" (manufactured by Daiwa Kasei Kogyo Co., Ltd.), 3,3'-dimethyl-5,5'-diethyl-4, 4'-diphenylmethane bismaleimide "BMI-5000", "BMI-5100" (manufactured by Daiwa Kasei Kogyo Co., Ltd.), 4-methyl-1,3-phenylene bismaleimide "BMI-7000" (manufactured by Daiwa Kasei Kogyo Co., Ltd.) Etc.

When the phenoxy resin is reacted with the acrylate-modified isocyanate, the crosslinkable part can be converted from a hydroxyl group to an acrylate group, so that not only itself can be crosslinked alone, but also the bismaleimide compounds described above can be used. As an acrylate modified isocyanate, isocyanate monomer series "Karenz MOI", "Kalens AOI" (made by Showa Denko KK), etc. are mentioned.

When the insulating resin layer according to the present embodiment contains an epoxy-containing compound such as bisphenol A epoxy resin “grade name: 1001” as a crosslinking agent, an amine-based catalyst, an imidazole, an aromatic sulfonium salt or the like as a catalyst Can be used. Furthermore, you may use a phenol resin and an acid anhydride as an additive. In addition, the additive demonstrated here contributes to a crosslinking reaction by the effect | action of a catalyst.

Examples of amine catalysts include meta-xylene diamine and trimethylhexamethylene diamine. Examples of imidazoles include 2-phenylimidazole and diazabicycloundecene. Examples of acid anhydrides include tetrahydrophthalic anhydride and hexahydrophthalic anhydride.

The film thickness of the insulating resin layer according to the present embodiment is preferably 50 μm or more. If the film thickness of the insulating resin layer is 50 μm or more, the pressure resistance of the insulated wire can be secured in a high density state where the insulated wires are in close contact with each other.

In the insulated wire according to the embodiment, another insulating resin layer may be included inside the insulating resin layer.

The insulated wire according to the present embodiment is wound, for example, as a winding around a stator core of a stator. In addition to the above-described stator, the rotary electric machine is provided with general motor components such as a rotor and an output shaft.

The rotary electric machine is suitable as, for example, a power generation device or a power generation device in a home electric appliance, an industrial electric appliance, a ship, a railway, an electric car, etc. by being provided with an insulated wire excellent in heat resistance and pressure resistance. In particular, even in a small-sized or high-power rotary electric machine, it has the property of being hard to cause dielectric breakdown due to heat, partial discharge, surge voltage and the like.

FIG. 4 is an enlarged view of the stator. The conductor 2 and the resin film 12 are provided inside the core material (magnetic steel sheet) 11. In the present embodiment, the conductor 2 and the resin film 12 are configured by the insulated wire 1.
<Method of manufacturing insulated wire>
Next, the manufacturing method of the insulated wire which concerns on this embodiment is demonstrated using FIG.

The extrusion molding using the thermoplastic resin of the insulated wire 1 according to the present embodiment is performed using an extrusion molding machine 21 such as a crosshead die having a die according to a desired wire shape.

The insulating resin material 22 forming the resin layer is introduced into the hopper of the extrusion molding machine 21, supplied to the cylinder, heated to a temperature above the glass transition temperature, and brought into a molten state. Thereafter, the insulating resin material 22 which has been heated and melted is supplied to the crosshead while being kneaded by a screw provided in the cylinder. The insulating resin material 22 is a resin mixture containing at least a thermoplastic phenoxy resin and a crosslinking agent (see resin mixture 1-4 described later).

A linear conductor core 23 is passed through the crosshead. The outer periphery of the conductor core wire 23 is covered with the insulating resin material 22 melted when passing through the crosshead, and the insulated wire 1 is formed. It becomes possible to control the film thickness of the insulating resin layer of the insulated wire 1 by the quantity of the insulating resin material 22 to coat. As described above, in order to ensure pressure resistance, it is desirable to set the film thickness to 50 μm or more.

Since the insulating resin material 22 coated on the insulated wire 1 is in a state before the thermoplastic resin is crosslinked, it has a self-bonding property. Therefore, in the present invention, when manufacturing a stator, a rotor, etc. of a rotating electrical machine using the insulated wire 1, it is possible to bond using the self-fusion property of the insulated wire 1 without using a varnish. . Therefore, since the impregnation process to the varnish conventionally required when manufacturing a stator etc. can be skipped, this invention has the effect that productivity improves in manufacture of a stator etc. for rotary battle machines.

The temperature (first heating temperature) when the thermoplastic phenoxy resin used for the insulating resin material 22 is in a molten state is in the range of 100 to 140 ° C., and the thermosetting (crosslinking) of the thermoplastic phenoxy resin contained in the resin mixture It is desirable that the temperature (second heating temperature) at the time of)) is in the range of 160 to 180.degree. C., and the first heating temperature is 20.degree. Lower than the second heating temperature.

EXAMPLES The present invention will next be described in detail by way of examples, which should not be construed as limiting the technical scope of the present invention.

80 g of tetrahydrofuran is placed in a 200 g polymer container with a lid, to which 16 g of an acrylic modified phenoxy resin "YP-70" (Toho Kasei Co., Ltd.) and 4 g of polyphenylmethane maleimide "BMI-2000" as a crosslinking agent (Daiwa Kasei Kogyo Co., Ltd. The solution was added and allowed to stand for one day to dissolve all the ingredients. After casting this solution to a Teflon solution, the tetrahydrofuran was removed by drying.

Thus, a resin mixture 1 having a thermoplastic phenoxy resin and bismaleimide was obtained. Next, the resin mixture 1 was formed on the outer periphery of a round wire with a diameter of 1 mm by extrusion molding to manufacture an insulated wire in which the insulating resin layer formed of the resin mixture 1 was formed. The film thickness of the insulating resin layer was 0.2 mm.

The insulating resin layer having a thermoplastic phenoxy resin and a crosslinking agent has self-bonding properties. Therefore, when the insulated wire is fixed to the coil, it can be easily fixed without using a varnish.

FIG. 1 is a schematic cross-sectional view of the insulated wire according to the first embodiment. In the insulated wire 1, the conductor 2 is a core wire having a circular cross section, and the insulating resin layer 3 mainly composed of phenoxy resin (that occupies 50% by weight or more of the whole insulating resin layer) It is covered.

In a 200 g lidded polymer container, 80 g of tetrahydrofuran is placed, into which 16 g of phenoxy resin “YP-70” (Toto Kasei Co., Ltd.), 2 g of bisphenol A epoxy resin “grade name: 1001” as a crosslinking agent, 0 as a catalyst .5 g of imidazole-based curing catalyst "P-200" (manufactured by Japan Epoxy Resins Co., Ltd.) and 2 g of phenol resin H-4 (Meiwa Kasei Co., Ltd.) as an additive were added and allowed to stand overnight to dissolve all components. The solution was cast into a Teflon solution and the tetrahydrofuran was removed by drying.

Thus, a resin mixture 2 having a thermoplastic phenoxy resin, an epoxy resin, an imidazole and a phenol resin was obtained. Next, a resin mixture 2 was formed on the outer periphery of a 1 mm × 2 mm rectangular wire by extrusion molding, to produce an insulated wire in which an insulating resin layer formed of the resin mixture 2 was formed. The thickness of the insulating resin layer was 0.2 mm.

FIG. 3 is a schematic cross-sectional view of the insulated wire according to the second embodiment. In the insulated wire 1, the conductor 2 has a core wire having a rectangular cross section, and the insulating resin layer 3 mainly composed of a thermoplastic phenoxy resin covers the entire periphery of the conductor 2. Thus, even with a rectangular core wire, the insulated wire of the present invention can be configured.

In this example, a phenoxy resin, a bisphenol A type epoxy resin, a phenol resin, and an imidazole-based curing catalyst are dissolved in tetrahydrofuran, and a resin mixture 2 is obtained after solvent drying. However, resin mixture 2 may be obtained by directly melt-kneading a phenoxy resin, a bisphenol A type epoxy resin, a phenol resin, and an imidazole-based curing catalyst at an extrusion molding temperature or less.

80 g of tetrahydrofuran is placed in a 200 g polymer container with a lid, 14 g of phenoxy resin "YP-70" (Tohto Kasei Co., Ltd.) and 2 g of bisphenol A epoxy resin "grade name: 1001" as a crosslinking agent are added as a catalyst 0.5 g of imidazole based curing catalyst "P-200" (manufactured by Japan Epoxy Resins Co., Ltd.), 2 g of phenol resin H-4 (Meiwa Kasei) as an additive, 2 g of bismaleimide "BMI-2000" (Daiwa Kasei Kogyo Co., Ltd.) Made in a company), and allowed to stand for one day to dissolve all the ingredients. The solution was cast into a Teflon solution and the tetrahydrofuran was removed by drying.

Thus, a resin mixture 3 having a thermoplastic phenoxy resin, an epoxy resin, an imidazole, a phenol resin and a bismaleimide was obtained. Next, the resin mixture 3 was formed on the outer periphery of a round wire with a diameter of 1 mm by extrusion molding to manufacture an insulated wire in which the insulating resin layer formed of the resin mixture 3 was formed. The thickness of the insulating resin layer was 0.2 mm.

The insulated wire according to the third embodiment has a circular cross section as shown in FIG. 1 as in the first embodiment.

When Example 3 is compared with Example 2, it was also confirmed that the heat resistance of the direction of Example 3 is improved by addition of bismaleimide. Furthermore, it was also confirmed that the adhesion to the core wire was improved by 20% or more by the addition of bismaleimide.

In a 200 g lidded polymer container, 80 g of tetrahydrofuran is placed, into which 14 g of phenoxy resin "YP-70" (Toho Kasei Co., Ltd.), 3 g of duranate "17B-60P" as a crosslinking agent, 3 g of polyphenylmethane maleimide as an additive "BMI-2000" (manufactured by Daiwa Kasei Kogyo Co., Ltd.) was added and allowed to stand for one day to dissolve all components. The solution was cast into a Teflon solution and the tetrahydrofuran was removed by drying.

Thereby, a resin mixture 4 having a thermoplastic phenoxy resin, duranate and a maleimide compound was obtained. Next, a resin mixture 4 was formed on the outer periphery of a 1 mm × 2 mm rectangular wire by extrusion molding, to produce an insulated wire in which an insulating resin layer formed of the resin mixture 4 was formed. The thickness of the insulating resin layer was 0.2 mm.

The insulated wire according to the third embodiment has a flat cross section as shown in FIG. 3 as in the second embodiment.

An insulated wire according to an example in which two insulating resin layers were laminated on a conductor was manufactured. A copper round wire with a diameter of 1 mm was used as the conductor. Further, the inner layer in the resin laminate was formed of a thermosetting polyimide varnish "Sun Ever SE-150" (manufactured by Nissan Chemical Industries, Ltd.), and the insulating resin layer of the outer layer was formed of the above-mentioned resin mixture 4.

A thermosetting polyimide was applied to the outer periphery of a 1 mm diameter circular wire and temporarily dried at room temperature. And it baked at 300 degreeC in a thermostat for 1 hour, and formed the resin layer (inner layer) of polyimide. In addition, the film thickness of the formed resin layer (inner layer) was about 0.01 mm. Then, the insulated wire in which the insulation resin layer which comprises resin mixture 4 by extrusion molding was formed in the perimeter of this resin layer (inner layer) was manufactured. The film thickness of the resin layer (outer layer) was 0.2 mm.

FIG. 2 is a schematic cross-sectional view of an insulated wire according to a fifth embodiment. In the insulated wire 1, the conductor 2 has a core wire having a circular cross section, and the inner layer insulating resin layer 4 which is a thermosetting polyimide covers the entire circumference of the conductor 2. The outer periphery is covered with the phenoxy resin mixture shown by the resin mixture 4 which is the insulating resin layer 3.

Moreover, compared with Example 4, the heat resistant improvement was also confirmed by having provided the thermosetting polyimide layer as an inner-layer insulating resin layer.

An insulated wire according to an example in which two insulating resin layers were laminated on a conductor was manufactured. A copper round wire with a diameter of 1 mm was used as the conductor. Further, the inner layer in the resin laminate was formed of thermoplastic polyphenylene sulfide "Toprene" (Toto Kasei Co., Ltd.), and the insulating resin layer of the outer layer was formed of the above-mentioned resin mixture 3.

A thermoplastic polyphenylene sulfide resin layer (inner layer) was formed on the outer periphery of a round wire with a diameter of 1 mm by extrusion molding. In addition, the film thickness of the formed resin layer (inner layer) was about 0.1 mm. Then, the insulated wire in which the insulated resin layer which comprises resin mixture 3 by extrusion molding was formed in the perimeter of this resin layer (inner layer) was manufactured. The film thickness of the resin layer (outer layer) was 0.1 mm.

The insulated wire according to the sixth embodiment has a circular cross section including two insulating resin layers as shown in FIG. 3 as in the fifth embodiment.

Moreover, compared with Example 3, the improvement of heat resistance was also confirmed by having provided the thermoplastic polyphenylene sulfide resin layer as an inner-layer insulating resin layer.
Comparative Example
The insulated wire according to Comparative Example 1-5 was manufactured as a configuration having no crosslinking agent in each of the insulated wires according to Example 1-6, and an attempt was made to confirm heat resistance. However, heat sag of the insulating resin layers of all the insulated wires of Comparative Example 1-6 was observed, and the heat resistance index could not be determined.

From the above results, it has been confirmed that the heat resistance and shape maintenance of the insulated wire depend on whether or not the phenoxy resin of the insulating resin layer is crosslinked. That is, it is concluded that the effect derived from being an insulated wire is that conversion to a thermosetting resin is possible by heat treatment after extrusion molding.

In Comparative Example 1, the bismaleimide used in the resin mixture 1 was removed to prepare a resin mixture.

In Comparative Example 2, the imidazole used in Resin Mixture 2 was removed to prepare a resin mixture.

In Comparative Example 3, the imidazole and bismaleimide used in the resin mixture 3 were removed to prepare a resin mixture.

In Comparative Examples 4 and 5, the resin mixture was obtained by removing the duranate used in the resin mixture 4.

In Comparative Example 6, the imidazole and bismaleimide used in the resin mixture 3 were removed to obtain a resin mixture.
<Evaluation of heat resistance>
The insulated wire according to Example 1-6 was fired in a thermostat at 180 ° C. for 2 hours to confirm heat resistance. The manufactured insulated wire was allowed to stand in a thermostat at 200 ° C., 220 ° C. and 240 ° C., and the weight loss time at which the weight of 5% by mass decreased was measured.

The activation energy of the thermal decomposition reaction was calculated by plotting the weight loss time at each of the measured temperatures, and the temperature which requires 20,000 hours to reduce the weight of 5% by mass was determined as a heat resistance index. As a result, the heat resistance indexes of the insulated wire according to Example 1-6 were 180 ° C., 190 ° C., 200 ° C., 200 ° C., 210 ° C., and 210 ° C. in this order.

Here, in the present specification, the heat resistance index means a holding temperature which requires 20,000 hours for holding the resin composition at a constant temperature and reducing the weight by 5% by weight.

When actually determining the heat resistance index, the following acceleration method is used. First, the time until the weight is reduced by 5% by weight at two or more different holding temperatures is measured. Next, using the Arrhenius equation of the following equation (1), taking the reciprocal of each holding temperature (absolute temperature) on the horizontal axis, and plotting the logarithm of the time to decrease by 5% by weight on the vertical axis The activation energy Ea (unit: kcal / mol) of the decomposition reaction of the insulating resin involved in the reduction of the weight can be derived. Further, in the equation (1), θ is referred to as a conversion time, which is a constant specific to the resin composition used. This constant θ can be determined from the intercept of the above plot. R is a gas constant (value is 1.987 cal / K.mol), T is a holding temperature (unit: K: absolute temperature).

When the activation energy and the conversion time are determined from the above plot, the weight is reduced by 5% by substituting the activation energy and the conversion time determined for 20,000 hours on the left side of the equation (1) and the right side. The holding temperature T which requires 20,000 hours can be calculated, and this holding temperature becomes a heat resistance index.

DESCRIPTION OF SYMBOLS 1 ... Insulated electric wire, 2 ... Conductor, 3 ... Insulating resin layer, 4 ... Inner layer insulating resin layer 11 ... Core material, 12 ... Resin film 21 ... Extrusion molding machine, 22 ... Insulating resin material, 23 ... Conductor core wire

Claims (20)

An insulated wire in which an insulating resin layer is formed on the outer periphery of a conductor,
The insulating resin layer has a thermoplastic phenoxy resin and a crosslinking agent,
An insulated wire characterized in that the phenoxy resin has a bisphenol A skeleton and a bisphenol F skeleton. The insulated wire according to claim 1, wherein
An insulated wire characterized in that the insulating resin layer has a self-bonding property. The insulated wire according to claim 1 or 2, wherein
The insulated wire characterized in that the crosslinking agent is a bismaleimide compound. The insulated wire according to claim 1 or 2, wherein
The crosslinker is an epoxy compound,
The said insulated resin layer contains an imidazole, The insulated wire characterized by the above-mentioned. The insulated wire according to claim 1 or 2, wherein
The said crosslinking agent is block isocyanate, The insulated wire characterized by the above-mentioned. The insulated wire according to any one of claims 1 to 5, wherein
An insulated wire characterized in that the phenoxy resin accounts for 50% by weight or more of the whole insulating resin layer. An insulated wire according to any one of claims 1 to 6, wherein
The film thickness of the said insulating resin layer is 50 micrometers or more, The insulated wire characterized by the above-mentioned. The insulated wire according to any one of claims 1 to 7, wherein
An insulated wire characterized in that a thermosetting temperature of the phenoxy resin is 160 to 180 ° C. The insulated wire according to any one of claims 1 to 8, wherein
The insulated resin layer is an insulated wire formed by an extrusion process. The insulated wire according to any one of claims 1 to 9, wherein
Has two insulating resin layers,
An insulated wire comprising an outer layer of the insulating resin layer and an inner layer of an insulating resin layer different from the outer layer. The insulated wire according to claim 10, wherein
An insulated wire characterized in that the insulating resin layer of the inner layer contains a polyimide varnish. A rotating electrical machine comprising an insulated wire having an insulating resin layer formed on the outer periphery of a conductor,
The insulating resin layer has a thermoplastic phenoxy resin and a crosslinking agent,
The phenoxy resin has a bisphenol A skeleton and a bisphenol F skeleton. A method of manufacturing an insulated wire,
Heating a resin mixture containing a thermoplastic phenoxy resin and a crosslinking agent to a molten state;
A conductor coating step of coating a conductor by extrusion molding the resin mixture in the molten state;
The method for producing an insulated wire, wherein the phenoxy resin has a bisphenol A skeleton and a bisphenol F skeleton. It is a manufacturing method of the insulated wire according to claim 13,
The method for producing an insulated wire, wherein the crosslinking agent is a bismaleimide compound. It is a manufacturing method of the insulated wire according to claim 13,
The crosslinker is an epoxy compound,
The manufacturing method of the insulated wire characterized by adding an imidazole as a catalyst in the said resin mixture creation process. It is a manufacturing method of the insulated wire according to claim 13,
The method for producing an insulated wire, wherein the crosslinking agent is a blocked isocyanate. A method of manufacturing an insulated wire according to any one of claims 13 to 16, wherein
The method for producing an insulated wire, wherein the phenoxy resin accounts for 50% by weight or more of the entire resin mixture. A method of manufacturing an insulated wire according to any one of claims 13 to 17, wherein
A manufacturing method of an insulated wire characterized in that a heating temperature in the heating step is 100 to 140 ° C., and a thermosetting temperature of the resin mixture is 160 to 180 ° C. A method of manufacturing an insulated wire according to any one of claims 13 to 17, wherein
The manufacturing method of the insulated wire characterized by the heating temperature of the said heating process being 20 degreeC or more lower than the thermosetting temperature of the said resin mixture. A method of manufacturing an insulated wire according to any one of claims 13 to 19, wherein
A method of manufacturing an insulated wire, comprising heating the resin mixture coated on the conductor at a temperature higher than the heating temperature in the heating step to crosslink the phenoxy resin with the crosslinking agent.

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