JP2010166809A - Rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating electrical machine improved in thermal conductivity to secure the electric characteristics even when a coil insulator is oriented and arranged in the edgewise direction of an insulating layer. <P>SOLUTION: The rotating electrical machine is provided with: a conductor bundle constituted by bundling conductors and arranged in a core slot; and a coil insulator having an insulation between conductors and a main insulation surrounding the conductor bundle with respect to the slot. The coil insulator includes: a mica layer consisting of at least one of a peeling mica and a laminated mica, a fabric consisting of at least either one of an inorganic substance and an organic substance, a powder of hexagonal boron nitride having a crystallization index of 1.8 or more, and a thermosetting polymeric organic resin integrating the mica layer and the powder of hexagonal boron nitride. The powder of hexagonal boron nitride is orientated and arranged in the coil longitudinal direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine in which hexagonal boron nitride powder having a crystallization index of 1.8 or more as a coil insulator is arranged in the insulation by being oriented along the coil longitudinal direction or the mica tape lamination direction. .

 In many cases, insulation of mica and thermosetting polymer organic resin as main components is applied to a coil of a large or high voltage rotating electrical machine. However, an organic resin that is inferior in heat resistance as compared with metals and ceramics is used as one of the main constituent materials of insulation, and during operation of the device, it is deteriorated by an increase in coil temperature due to Joule loss. For this reason, various coil cooling systems are employed in rotating electrical machines, particularly large generators, to suppress the deterioration effect.

  In this cooling method, the conductor is made into a hollow structure and water or hydrogen is circulated to directly cool the coil, and the Joule heat generated in the coil conductor is radiated to the iron core via the coil insulation for cooling. These are roughly classified into two types, indirect cooling systems that are cooled by hydrogen or air circulating inside the iron core.

  Recently, an indirect cooling method that is simple in structure, excellent in maintainability, and low in price has attracted attention, and its capacity has been increasing.

  However, indirect cooling method dissipates Joule heat via coil insulation, so heat dissipation is hindered by insulation that is inferior in thermal conductivity compared to metal or ceramic, and cooling capacity is inferior compared to direct cooling method There are many. Therefore, Patent Document 1 discloses a technique for improving the thermal conductivity of insulation as described below as an example.

  6 and 7 are diagrams for explaining this. A wire insulation 19 for insulation between the conductors arranged adjacent to each other, and a bundle 22 of a number of conductors 21 with a main insulation 20 surrounding the wire bundle for the slot of the device, the main insulation Comprises a packaging material of an insulating material in the form of a tape or sheet comprising a layer 24 having small mica flakes (peeled mica) 23 wound around the conductor bundle in several layers. The space 25 between the flake layer 24 and the mica flake layer 24 in the packaging material contains a cured impregnating resin.

  Intrinsic thermal conductivity and filler of at least 5 W / mK of impregnated resin disposed in a space 25 between at least mica layers in a stator for a rotating electrical machine or a coil for arranging in a slot in a rotor, particularly a high voltage coil And at least 90% by weight of filler particles 26 having a particle size of 0.1 to 15 μm.

  Here, when a hexagonal boron nitride powder is used as a filler having a thermal conductivity of 5 W / mK or more, the substance has anisotropy in thermal conductivity, and the thermal conductivity in the Z-axis direction of the crystal axis. From the viewpoint of improving thermal conductivity, the stacking direction of the mica flake layer 24 and the Z axis of the crystal are perpendicular to each other, that is, the mica flake layer 24 is oriented in the through layer direction. It is more desirable.

  On the other hand, since the substance is scaly, the stacking direction of the mica flake layer 24 is parallel to the Z axis of the crystal so that the path length of the electrical tree that causes electrical degradation is electrically extended. It is desirable that the mica flake layer 24 is arranged in the layering direction with respect to the stacking direction of the mica flake layer 24 or the coil longitudinal direction, and it is difficult to achieve both electrical characteristics and thermal conductivity.

  In Patent Document 2, the thermal conductivity when a boron nitride powder having a particle size of 30 to 100 μm is blended in a mica sheet to form an epoxy resin laminated product is improved as compared with an unblended product. It is described. However, when the particle size of the powder is made together with mica having a particle size thickness of 1 to 50 μm and a size of 0.1 to 1.5 mm as described in the specification, a mica sheet is formed in the same direction as the mica scale in the mica sheet. When oriented to provide coil insulation, hexagonal boron nitride powder is oriented in the mica sheet laminating direction or the longitudinal direction of the coil, so that it is used in the direction where the thermal conductivity of boron nitride is lower. It will be. In this case, both electrical characteristics and thermal conductivity are improved as compared with the unblended product, but there is room for further improvement in thermal conductivity.

Japanese Unexamined Patent Publication No. 63-110929 JP-A-55-53802

  In the example of Patent Document 1, although the thermal conductivity is improved by filling a material having a high thermal conductivity, the hexagonal boron nitride, which is anisotropic and has a scale-like material, is filled. The degree of improvement in thermal conductivity may be suppressed by orientation.

  In particular, when used for coil insulator insulation of a rotating electrical machine, it is convenient to orient so that the thermal conductivity is small from the viewpoint of electrical characteristics, and this tendency appears remarkably. In addition, from the viewpoint of manufacturing a high thermal conductivity mica tape, it is easy to orient because it is applied to the surface of the mica tape by a brush or a bar coater or by dropping.

  In the example of Patent Document 2, since hexagonal boron nitride having the same scaly shape is made together with the mica piece having the scaly shape, the paper is oriented more than the example of Patent Document 1, and the improvement of the thermal conductivity is suppressed. Tend to.

  Thus, in rotating electrical machine insulation using hexagonal boron nitride having anisotropy in crystal structure and thermal conductivity, there is an example in which improvement in thermal conductivity is hindered by orientation. Accordingly, there has been a demand for rotating electrical machine insulation that can be oriented to ensure electrical characteristics and that can greatly improve thermal conductivity.

  The present invention has been made based on such circumstances, and in a rotating electrical machine using hexagonal boron nitride powder as a coil insulator, the rotating electrical machine further improving thermal conductivity while ensuring electrical characteristics. The purpose is to provide.

In order to achieve the above object, the invention corresponding to claim 1 is characterized in that a conductor bundle formed by bundling conductors is disposed in a slot of a rotor core or a stator core of a rotating electric machine, and between the conductors. In a rotating electrical machine comprising a coil insulator that has been subjected to main insulation that surrounds the wire bundle with respect to the slot and the wire bundle,
The coil insulator includes a mica layer composed of at least one of peeled mica or laminated mica, a woven fabric composed of at least one of an inorganic material and an organic material, and a hexagonal nitriding material having a crystallization index of 1.8 or more. A powder of boron, and a thermosetting polymer organic resin that integrates the mica layer and the hexagonal boron nitride powder, and the hexagonal boron nitride powder is oriented in the longitudinal direction of the coil. The rotating electric machine is characterized by being arranged.

In order to achieve the above object, according to a second aspect of the present invention, there is provided a conductor bundle formed by bundling insulating coated conductors in a slot provided in a rotor core or a stator core of a rotating electric machine, and the conductor In a rotating electrical machine comprising a coil insulator that performs insulation between each other and main insulation surrounding the bundle of wires with respect to the slot,
The coil insulator includes a mica layer composed of at least one of peeled mica or laminated mica, a woven fabric composed of at least one of an inorganic material and an organic material, and a polymer organic that adheres the mica layer and the woven fabric. An organic resin comprising a mica tape made of a resin and containing hexagonal boron nitride powder having a crystallization index of 1.8 or more on at least one of the facing surface of the woven fabric of the mica tape or the facing surface of the mica layer A rotating electric machine characterized by being obtained by winding a resin-coated mica tape coated with a conductive wire bundle, impregnating the mica tape with a thermosetting polymer organic resin and curing.

In order to achieve the above object, according to a third aspect of the present invention, there is provided a wire bundle configured by bundling insulation coated wires in a slot of a rotor core or a stator core of a rotating electric machine, and the wire In a rotating electrical machine comprising a coil insulator that performs insulation between each other and main insulation surrounding the bundle of wires with respect to the slot,
The coil insulator is a mixed mica paper obtained by mixing and forming a hexagonal boron nitride powder having a crystallization index of 1.8 or more, a woven fabric made of at least one of an inorganic substance and an organic substance, and the laminated mica paper. A mica tape made of a polymer organic resin that adheres a woven fabric is wound around the wire bundle, and then the mica tape is impregnated with a thermosetting polymer organic resin and cured. Rotating electric machine.

In order to achieve the above-mentioned object, according to a fourth aspect of the present invention, there is provided a wire bundle configured by bundling insulation-coated wires in a slot of a rotor core or a stator core of a rotating electric machine, and the wire In a rotating electrical machine comprising a coil insulator that performs insulation between each other and main insulation surrounding the bundle of wires with respect to the slot,
The coil insulator is a mica layer composed of at least one of peeled mica or laminated mica, a woven fabric composed of at least one of an inorganic material and an organic material, and a semi-cured material for bonding the mica layer and the woven fabric. A hexagonal boron nitride powder having a crystallization index of at least 1.8 on at least one of the surface facing the woven fabric or the surface facing the mica layer of a mica tape made of a thermosetting polymer organic resin. A rotating electrical machine obtained by mica tape coated with an organic resin containing, wound around the wire bundle, press-molded, and heat-cured.

In order to achieve the above object, according to a fifth aspect of the present invention, there is provided a conductor bundle formed by bundling insulation-coated conductors in a slot of a rotor core or a stator core of a rotating electric machine, and the conductor In a rotating electrical machine comprising a coil insulator that performs insulation between each other and main insulation surrounding the bundle of wires with respect to the slot,
The coil insulator is a mixed mica obtained by mixing and making a hexagonal boron nitride powder having a crystallization index of 1.8 or more, a woven fabric made of at least one of an inorganic substance and an organic substance, and the laminated mica A rotating electrical machine characterized by being obtained by pressure-molding and heat-curing a mica tape made of a semi-cured thermosetting polymer organic resin for bonding a woven fabric, wound around the wire bundle .

  In the rotating electrical machine according to the present invention, the coil insulator disposed in the slot of the rotor core or the stator core has a crystallization index of a hexagonal boron nitride powder of 1.8 or more, so that The thermal conductivity can be further improved by arranging the insulating layers so as to be aligned in the creeping direction in order to ensure the desired characteristics.

  Embodiments of the present invention will be described below with reference to FIGS. 1 to 5 and Tables 1 and 2. In the rotating electrical machine of the present invention, the coil insulator disposed in the slot of the rotor core or the stator core is as follows. That is, conductor wires are bundled to form a conductor bundle, and the conductor bundles are arranged in slots having a plurality of conductor bundles in a rotor core or a stator core of a rotating electric machine, and insulation between the conductors and conductor bundles for the slots are provided. A main insulating material for surrounding insulation, a mica layer composed of at least one of peeled mica or laminated mica, a woven fabric composed of at least one of inorganic and organic substances, and a crystallization index of 1 .8 or more hexagonal boron nitride powder and a thermosetting polymer organic resin in which the mica layer and hexagonal boron nitride powder are integrated, and the hexagonal boron nitride powder is a coil. This is oriented in the longitudinal direction and will be described in detail.

  Here, the crystallization index (GI) is expressed by equation (2) using the peak areas of the (100) plane, (101) plane, and (102) plane of boron nitride in an X-ray diffraction image. It is a value to be set.

GI = (S (100) + S (101)) / S (102) (2) formula
Here, S (100) represents the peak area of the (100) plane.

  FIG. 1 is a view for explaining a high thermal conductivity mica tape used in the present invention. Mica tape is blended with hard unfired laminated mica paper 1 and glass cloth 2 made of mascobite so that Epicoat 1001 and Epicoat 828 (made by oiled shell epoxy) have a weight ratio of 10:90, and a solvent. The mica tape 4 is manufactured by impregnating the epoxy resin adhesive 3 diluted with methyl ethyl ketone and drying and volatilizing the solvent.

  Furthermore, the hexagonal boron nitride powder 5 having the properties shown in the column of Comparative Example 1 in Table 1 is blended in the epoxy resin adhesive 3 having the same composition, and applied to the surface of the glass cloth 2 of the mica tape 4. Then, the solvent is volatilized and dried again to form a powder layer 6 to obtain a high thermal conductivity mica tape 7. At the time of application, consideration was given so that the hexagonal boron nitride powder 5 was oriented in the layering direction with respect to the lamination direction of the mica sheet or glass cloth.

As shown in Table 2, the detailed specifications of the high thermal conductivity mica tape are as follows: mica weight 160 (g / m ² ), glass cloth weight 25 (g / m ² ), glass cloth thickness 0.030 (mm), adhesion Agent weight 25 (g / m ² ), hexagonal boron nitride weight 55 (g / m ² ), mica tape weight 265 (g / m ² ), mica tape width 30 (mm), mica tape thickness 0.20 ( mm).

  The high thermal conductivity mica tape 7 thus obtained is applied to an aluminum bar 8 (10 × 50 × 1000 mm) simulating a coil conductor of a rotating electric machine, as shown in FIG. The film was wound 10 times so as to overlap for 2 minutes and 20 tape layers, and impregnated with an epoxy resin composition (TVB2632, manufactured by Toshiba Chemical) under vacuum and pressure. The vacuuming condition is 13.3 Pa for 10 hours, and the pressure is 0.5 MPa for 15 hours. Thereafter, the stainless steel plate 10 subjected to the release treatment is applied to the upper, lower, left and right four surfaces so that the thickness of the insulating layer 9 after the heat curing becomes 3.5 mm as shown in FIG. Then, the stainless steel plate 10 was removed to obtain an insulating coil 11 of, for example, an armature of the rotating electric machine. Heating was performed at 150 ° C. for 20 hours in a hot air circulating thermostat.

  In Table 1, the average particle diameter is a value measured by the laser diffraction method, the specific surface area is a value measured by the BET method, the crystallization index is a value obtained from an X-ray diffraction image, and the thermal conductivity. Is a value measured by ASTM D4351.

  Comparative Example 2 is a case where the crystallization index of the hexagonal boron nitride powder is set to 1.4 instead of 0.9 as in Comparative Example 1, and in this case, the thermal conductivity of Comparative Example 1 is 0. .41 W / mK, and the thermal conductivity of Comparative Example 2 is 0.43 W / mK.

  On the other hand, the crystallization index of the hexagonal boron nitride powder in Example 1 of the present invention was 2.0, Example 2 was 3.0, and the thermal conductivity of Example 1 was 0. .49 W / mK, and the thermal conductivity of Example 2 is 0.60 W / mK, indicating that the thermal conductivity of Examples 1 and 2 of the present invention is higher than that of Comparative Examples 1 and 2. .

  When the cross section of the insulating layer 9 of the coil thus obtained was observed for each example, it was oriented in the layering direction of the mica tape layer.

  From the insulating layer 9 at the center in the longitudinal direction of the same coil, disks each having a diameter of 35 mm and a thickness of 3.5 mm are cut out, and the thermal conductivity (according to ASTM D4351) is measured in the mica tape layer penetration direction. did. As a result, as shown in FIG. 4, the higher the crystallization index, the higher the thermal conductivity, and in particular, the tendency to increase rapidly between crystallization indices 1.4 to 2.0. It is preferable that it is 1.8 or more.

  Furthermore, when the voltage dependence of dielectric loss tangent, dielectric breakdown voltage, and electrical charging life were evaluated for each of the produced coils, Comparative Examples 1 and 2 and Examples 1 and 2 all showed equivalent results. It was.

  Next, Comparative Example 3 and Example 3 will be described. In Comparative Example 3, the crystallization index was 0.9 and some conditions were as follows. In Example 3, 2.0 was set and some conditions were as follows. .

  As shown in FIG. 5, the high thermal conductivity mica tape 12 used here was 100 parts of fired laminated mica 13 and 40 parts of aromatic polyamide fibrid (water leakage 60 ° SR) 14 and Comparative Example 1 in Table 1 above. A hard-fired laminated mica paper 16 having a thickness of 0.08 mm obtained by making a dispersion obtained by mixing 20 parts of the hexagonal boron nitride 15 described in the column with a circular paper machine, and a glass cloth (thickness 0) .030 mm) 17 is impregnated with an epoxy resin adhesive 18 in which Epicoat 1001 and Epicoat 828 (manufactured by oiled shell epoxy) are blended so as to have a weight ratio of 10:90 and diluted with methyl ethyl ketone as a solvent. It is manufactured by drying and volatilizing.

  A coil was manufactured using the high thermal conductivity mica tape 12 having a thickness of 0.12 mm and a width of 25 mm thus obtained. The coil manufacturing method is the same as that of Comparative Example 1 except that the mica tape winding number is set to 15.

  When the cross sections of the armature insulating coil insulating layers of Comparative Example 3 and Example 3 thus obtained were observed, they were oriented in the same direction as the mica scales in the mica paper, that is, in the creeping direction of the mica tape layer. Confirmed that.

  A disc having a diameter of 35 mm and a thickness of 3.5 mm was cut out from the insulating layer at the central portion in the longitudinal direction of the same coil, and thermal conductivity (according to ASTM D4351) was measured in the mica tape layer penetration direction. . As a result, the thermal conductivity of Comparative Example 3 was 0.40 W / mK, and the thermal conductivity of Example 3 was 0.47 W / mK, confirming that the latter had high thermal conductivity.

  According to the embodiment of the rotating electrical machine described above, the coil insulator has a crystallization index of a hexagonal boron nitride powder of 1.8 or more, so that the insulation layer is formed in order to ensure electrical characteristics. Even if it is arranged in the direction, the thermal conductivity can be further improved.

  In addition to the embodiments described above, the present invention may be as follows.

  For example, as shown in FIG. 6, a conductor bundle 22 is formed by bundling insulation-coated conductors, and a plurality of conductor bundles 22 are disposed in slots (not shown) provided in a rotor core or a stator core of a rotating electric machine. When the insulation between the conductors 21 and the main insulation 20 surrounding the conductor bundle with respect to the slot are applied, the following may be performed. That is, a mica layer composed of at least one of peeled mica (mica flakes) or laminated mica, a woven fabric composed of at least one of inorganic and organic substances, for example, glass cloth, and a high bond between the mica layer and the woven fabric. An organic material comprising a mica tape made of a molecular organic resin, and containing a hexagonal boron nitride powder having a crystallization index of 1.8 or more on at least one of the facing surface of the woven fabric of the mica tape or the facing surface of the mica layer. The resin-coated mica tape coated with resin may be wound around the wire bundle, and then the mica tape may be impregnated with a thermosetting polymer organic resin and cured.

  In addition, a composite mica paper obtained by mixing and making a hexagonal boron nitride powder having a crystallization index of 1.8 or more, a woven fabric made of at least one of an inorganic substance and an organic substance, for example, a glass cloth, a laminated mica paper and a woven cloth. Alternatively, a mica tape made of a polymer organic resin that adheres can be wound around a wire bundle, and then the mica tape is impregnated with a thermosetting polymer organic resin and cured.

  Furthermore, a mica layer composed of at least one of peeled mica or laminated mica, a woven fabric composed of at least one of inorganic and organic materials, for example, a glass cloth, and a semi-cured thermosetting that bonds the mica layer and the woven fabric. Organic containing a hexagonal boron nitride powder having a crystallization index of at least 1.8 on at least one of the surface facing the woven fabric or the surface facing the mica layer A mica tape coated with a resin may be wound around a wire bundle, press-molded, and heat-cured.

  Also, a laminated mica obtained by mixing and making a hexagonal boron nitride powder having a crystallization index of 1.8 or more, a woven fabric made of at least one of an inorganic substance and an organic substance, for example, a glass cloth, a laminated mica and a woven cloth. Alternatively, a mica tape made of a semi-cured thermosetting polymer organic resin that adheres to may be obtained by winding it around a wire bundle, followed by pressure molding and heat curing.

Sectional drawing of the high thermal conductivity mica tape which is the main structural member in the Example of the coil insulator used for the rotary electric machine which concerns on this invention. FIG. 2 is a partial sectional view showing a state in which the mica tape of FIG. 1 is wound around a conductor. The schematic diagram showing the compression molding situation at the time of heat hardening in the case of manufacturing the coil insulator used for the rotary electric machine which concerns on FIG. The characteristic view which shows the crystallization index dependence of thermal conductivity in the coil insulator used for the rotary electric machine which concerns on this invention. Sectional drawing of the high thermal conductivity mica tape which is the main structural member of the coil insulator used for the rotary electric machine concerning this invention. Sectional drawing of the armature coil of the rotary electric machine which is a prior art. The fragmentary sectional view of the armature coil insulation using the high thermal conductivity mica tape which is the coil insulator of FIG.

  DESCRIPTION OF SYMBOLS 1 ... Hard unbaked laminated mica paper, 2 ... Glass cloth, 3 ... Epoxy resin adhesive, 4 ... Mica tape, 5 ... Hexagonal boron nitride powder, 6 ... Powder layer, 7 ... High heat conductive mica tape, 8 ... Conductor (Conductive wire), 9 ... insulating layer, 10 ... stainless steel plate, 11 ... insulating coil, 12 ... high thermal conductivity mica tape, 13 ... fired laminated mica, 14 ... aromatic polyamide fibrid, 15 ... hexagonal boron nitride, 16 ... Hard fired laminated mica paper, 17 ... glass cloth, 18 ... epoxy resin adhesive, 19 ... conductor insulation, 20 ... main insulation, 21 ... conductor, 22 ... conductor bundle, 23 ... mica flake, 24 ... mica flake layer, 25 ... Space, 26 ... particles.

Claims (6)

A conductor bundle formed by bundling conductors is disposed in a slot of the rotor core or stator core of the rotating electrical machine, and insulation between the conductors and main insulation surrounding the conductor bundle with respect to the slot are performed. In a rotating electrical machine equipped with a coil insulator,
The coil insulator includes a mica layer composed of at least one of peeled mica or laminated mica, a woven fabric composed of at least one of an inorganic material and an organic material, and a hexagonal nitriding material having a crystallization index of 1.8 or more. A powder of boron, and a thermosetting polymer organic resin that integrates the mica layer and the hexagonal boron nitride powder, and the hexagonal boron nitride powder is oriented in the longitudinal direction of the coil. A rotating electrical machine characterized by being arranged. In a slot of the rotor core or stator core of the rotating electrical machine, a conductor bundle formed by bundling insulation-coated conductors is disposed, and insulation between the conductors and main insulation surrounding the conductor bundle with respect to the slot are provided. In a rotating electrical machine equipped with a coil insulator,
The coil insulator includes a mica layer composed of at least one of peeled mica or laminated mica, a woven fabric composed of at least one of an inorganic material and an organic material, and a polymer organic that adheres the mica layer and the woven fabric. An organic resin comprising a mica tape made of a resin and containing hexagonal boron nitride powder having a crystallization index of 1.8 or more on at least one of the facing surface of the woven fabric of the mica tape or the facing surface of the mica layer A rotating electrical machine obtained by winding a resin-coated mica tape coated with a wire around the wire bundle, impregnating the mica tape with a thermosetting polymer organic resin, and curing. In a slot of the rotor core or stator core of the rotating electrical machine, a conductor bundle formed by bundling insulation-coated conductors is disposed, and insulation between the conductors and main insulation surrounding the conductor bundle with respect to the slot are provided. In a rotating electrical machine equipped with a coil insulator,
The coil insulator is a mixed mica paper obtained by mixing and forming a hexagonal boron nitride powder having a crystallization index of 1.8 or more, a woven fabric made of at least one of an inorganic substance and an organic substance, and the laminated mica paper. A mica tape made of a polymer organic resin that adheres a woven fabric is wound around the wire bundle, and then the mica tape is impregnated with a thermosetting polymer organic resin and cured. Rotating electric machine. In a slot of the rotor core or stator core of the rotating electrical machine, a conductor bundle formed by bundling insulation-coated conductors is disposed, and insulation between the conductors and main insulation surrounding the conductor bundle with respect to the slot are provided. In a rotating electrical machine equipped with a coil insulator,
The coil insulator is a mica layer composed of at least one of peeled mica or laminated mica, a woven fabric composed of at least one of an inorganic material and an organic material, and a semi-cured material for bonding the mica layer and the woven fabric. A hexagonal boron nitride powder having a crystallization index of at least 1.8 on at least one of the surface facing the woven fabric or the surface facing the mica layer of a mica tape made of a thermosetting polymer organic resin. A rotating electrical machine obtained by mica tape coated with an organic resin containing, wound around the wire bundle, press-molded, and heat-cured. In a slot of the rotor core or stator core of the rotating electrical machine, a conductor bundle formed by bundling insulation-coated conductors is disposed, and insulation between the conductors and main insulation surrounding the conductor bundle with respect to the slot are provided. In a rotating electrical machine equipped with a coil insulator,
The coil insulator is a mixed mica obtained by mixing and making a hexagonal boron nitride powder having a crystallization index of 1.8 or more, a woven fabric made of at least one of an inorganic substance and an organic substance, and the laminated mica A rotating electrical machine obtained by winding a mica tape made of a semi-cured thermosetting polymer organic resin for adhering a woven fabric around the wire bundle, followed by pressure molding and heat curing. The crystallization index (GI) is a value GI (X) expressed by the equation (1) using peak areas of the (100) plane, (101) plane, and (102) plane of the boron nitride in the X-ray diffraction image. graphtization index). The rotating electrical machine according to any one of claims 1 to 5.
GI = (S (100) + S (101)) / S (102) (1) formula
Here, S (100) represents the peak area of the (100) plane.

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