JP2001061247A - Stator coil for rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the temperature rises of stator coils by improving the thermal conductivity from conductors to a stator core, by packing a high-thermal conductivity member containing a curable insulating intimate mixture containing a highly blended inorganic filler in wedge-like gaps formed between flat square insulated element wires and a resin-impregnated tape. SOLUTION: After a plurality of flat square insulated element wires 3 are bundled and formed in a coil-like state by causing the bundle to made Roebel transposition, a prepreg separator obtained by impregnating a glass cloth reinforced tape with a thermosetting resin is inserted into the space between element wire rows 30b, and a prepreg filler composed of a thermosetting resin is arranged in the Roebel transition section. Then the bundle of the element wire 3 is finished to a conductor having the final cross-sectional shape by curing the thermosetting resins of the prepreg separator and prepreg filler, while the bundle is integrally molded by heat pressing. At the positions where the corner sections of adjacent element wires 3 are faced to each other on the side face of the conductor, wedge-like gaps are formed between the wires 3 and an insulating layer 7. Into the portions of the grooves 10, patty 12 prepared by mixing inorganic power having a high coefficient of thermal conductivity in a thermosetting resin is applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine constituted by accommodating an insulating coil formed by forming an insulating layer on a conductor in a slot of a stator core. More specifically, the present invention relates to a stator coil of a rotating electric machine that can increase the thermal conductivity from a conductor to a cooling gas to suppress a temperature rise of an insulating coil and contribute to downsizing of a device.

[0002]

2. Description of the Related Art FIG. 5 shows a stator coil 2 housed in a slot of a stator core 1 of a conventional high-voltage rotating electric machine such as a generator or a motor. Generally, such a stator coil is manufactured as follows.

[0003] First, after a plurality of rectangular insulated wires 3 are bundled and subjected to label transposition, a prepreg separator 4 of thermosetting resin is interposed between the wire arrays 30a and 30b, and a thermosetting resin is disposed at the label transposition portion. Resin prepreg fillers 5 are arranged.

[0004] Then, hot pressing is performed to obtain a wire bundle 30a,
While integrally forming 30b, the thermosetting resin of the prepreg separator 4 and the prepreg filler 5 is cured by heating to finish the conductor 6 having the final cross-sectional shape.

[0005] A plurality of layers of mica tape are wound around the obtained conductor 6. The mica tape layer is impregnated with a thermosetting resin under vacuum pressure, and cured by heating to form an insulating layer 7.

[0006] The stator coil 2 of such a rotating electric machine is accommodated in a slot of the stator core 1 together with an insulating spacer 8, and is fixed by a slot wedge 9 to suppress electromagnetic vibration during operation.

[0007] The stator coil 2
Generates heat, but a part of the heat is directly transmitted to the cooling gas, and most of the remaining heat is indirectly transmitted through the stator core 1. At this time, since all the heat of the conductor 6 is cooled by conducting through the insulating layer 7 of the stator coil 2, the thermal conductivity of this cooling path is very important.

That is, if the heat resistance of this cooling path is high, the heat generated inside the conductor 6 becomes difficult to be transmitted to the cooling gas, resulting in an excessive rise in the temperature of the stator coil 2. Therefore, the electrical and mechanical performance degradation of the organic material forming the insulating layer 7 is promoted by long-term operation.

The above-described insulating layer 7 is mainly composed of mica paper, reinforcing glass cloth, thermosetting resin, and the like. The thermal conductivity of these constituent materials is approximately 0.5 W / m · K for mica, 1.0 W / m · K for glass, and 0.2 W for epoxy resin which is a typical thermosetting resin.
/ M · K.

From this, it can be seen that in order to improve the thermal conductivity of the insulating layer 7, it is effective to reduce the volume of the thermosetting resin having the lowest thermal conductivity. In particular, the impregnated thermosetting resin easily accumulates in the weave of the reinforcing glass cloth, so take measures such as using a thin reinforcing glass cloth as much as possible or squeezing out the impregnated resin by applying an appropriate molding pressure during heat curing. It has been implemented.

By the way, in the stator coil 2 of the high-voltage rotating electric machine manufactured in the above process, a magnetic field crossing the stator coil 2 in the slot width direction exists. In order to reduce the eddy current loss generated in the conductor 6 due to this magnetic field, the coil conductor 6 is divided into wires and subjected to label transposition as described above.

For the sake of manufacturing and handling, the corners of the wire 3 are provided with roundings having a predetermined curvature. Therefore,
A wedge-shaped gap is formed between the insulating layer 7 and a position where the corners of the adjacent wires 3 face each other on the side surface of the conductor 6 in which the wires 3 are bundled. Become.

As described above, in order to improve the thermal conductivity of the insulating layer 7, even in the case of the stator coil 2 manufactured by devising a reinforcing glass cloth or molding pressure, the wire 3 on the surface of the conductor 6 is used. Since the impregnated thermosetting resin 11 is stored in the groove 10 formed between the portion where the corners of the conductors face each other and the insulating layer 7, the thermal conductivity from the conductor 6 to the cooling gas is reduced. .

On the other hand, since the prepreg filler 5 disposed at the label dislocation portion usually occupies 40 to 70% of its volume by the thermosetting resin, the thermosetting resin in this portion is also transferred from the conductor 6 to the cooling gas. Inhibits the thermal conductivity of

[0015]

As described above, in the stator coil 2 of the conventional high-voltage rotating electric machine, even if the insulating layer 7 itself is devised, even between the adjacent wires 3 on the surface of the conductor 6. Due to the effect of the thermosetting resin existing in the formed groove 10 or in the label dislocation portion, the thermal conductivity from the conductor 6 to the cooling gas is hindered, and the temperature of the stator coil 2 may be increased.

An object of the present invention is to provide a stator coil of a rotating electric machine that can increase the thermal conductivity from a conductor to a stator core and suppress a rise in the temperature of the stator coil.

[0017]

In order to achieve the above object, a stator coil of a rotating electric machine according to claim 1 is formed by integrating a plurality of flat rectangular insulated wires into a coil while displacing the same, and forming an outer periphery thereof. In a stator coil provided with an insulating layer obtained by impregnating and curing a resin on a tape wound around, a wedge-shaped space formed between the rectangular insulated wire and the resin-impregnated tape was highly blended with an inorganic filler. It is characterized by being filled with a high heat conductive member containing a curable insulating mixture and cured.

A case where only a thermosetting resin is stored in a void by filling a high thermal conductive member having excellent thermal conductivity into a wedge-shaped void formed between the rectangular insulated wire and the resin-impregnated tape. The thermal conductivity can be improved as compared with

According to a second aspect of the present invention, there is provided a stator coil for a rotating electric machine, wherein a plurality of rectangular insulated wires are displaced and integrated in a coil shape, and an insulating layer formed by impregnating and curing a resin wound around a tape wound around the coil is formed. In the stator coil provided, a gap formed between the dislocation portion of the rectangular insulated wire and the resin-impregnated tape is filled with a high heat conductive member containing a curable insulating admixture highly blended with an inorganic filler. Characterized by being cured.

By filling the label dislocation portion with a high thermal conductivity member having excellent thermal conductivity, the thermal conductivity of the conductor can be improved.

The third aspect of the present invention is the first or second aspect.
In the stator coil of the rotary electric machine, the flat rectangular insulated wires are integrated in a coil shape and are integrally cured by heating and pressing.

According to a fourth aspect of the present invention, in the stator coil of the rotating electric machine according to any one of the first to third aspects, the high thermal conductive member is made of an inorganic material having a thermal conductivity of 5 W / m · K or more. It is a putty-like member made of a thermosetting resin containing a filler.

With such a configuration, the thermal conductivity of the wedge-shaped void formed between the rectangular insulated wire and the resin-impregnated tape or the label dislocation can be easily improved.

According to a fifth aspect of the present invention, in the stator coil of the rotating electric machine according to any one of the first to third aspects, the high thermal conductive member is made of an inorganic material having a thermal conductivity of 5 W / m · K or more. It is a reinforcing cloth coated or impregnated with a thermosetting resin containing a filler.

With such a configuration, the thermal conductivity of the wedge-shaped gap formed between the rectangular insulated wire and the resin-impregnated tape or the label dislocation can be easily improved.

According to a sixth aspect of the present invention, there is provided the stator coil of the rotating electric machine according to any one of the first to fifth aspects,
The inorganic filler is selected from the group consisting of alumina (Al ₂ O ₃ ), beryllium oxide (BeO), magnesium oxide (MgO), aluminum nitride (AlN), boron nitride (BN), and silicon carbide (SiC). At least one
It is characterized by containing seeds.

With this configuration, the thermal conductivity is improved, and the heat generated in the coil conductor can be efficiently transmitted to the cooling gas.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. The same components as those in the above-described related art are denoted by the same reference numerals, and detailed description is omitted. The present invention is not limited to the embodiments described below, but can be implemented with appropriate modifications without departing from the scope of the invention.

(First Embodiment) The stator coil of the present embodiment is formed at a position where the corners of the wires 3 on the side surfaces of the conductor 6 face each other as shown in a partially enlarged cross-sectional view of FIG. The structure is basically the same as that of the above-described conventional stator coil, except that the high-thermal-conductivity putty 12 is filled in the groove 10 which is the void.

As in the conventional stator coil shown in FIG. 5, the conductor 6 includes a plurality of element wires 30a,
0b, a prepreg separator 4 disposed between the strands 30a and 30b, and a prepreg filler 5 disposed at the label dislocation portion. An insulating layer 7 is provided around the prepreg filler 4 and the prepreg filler 5.

The stator coil 2 of this embodiment is manufactured as follows. After bundling a plurality of rectangular insulated wires 3 and performing label transposition to form a coil, a prepreg separator 4 in which a thermosetting resin is impregnated with a glass reinforcing tape is inserted between the wire rows 30a and 30b, and a label transposition portion is formed. A prepreg filler 5 made of a thermosetting resin is placed in the space.

Next, the thermosetting resin of the prepreg separator 4 and the prepreg filler 5 is heat-cured while integrally forming the wire bundle of the wires 3 by heat pressing to finish the conductor 6 having the final sectional shape.

As shown in the partial enlarged cross-sectional view of FIG. 1, a wedge-shaped gap is formed between the conductor 6 and the insulating layer 7 at the position where the corners of the adjacent wires 3 face each other. A putty 12 in which an inorganic powder having a thermal conductivity of 5 W / m · K or more is mixed in a thermosetting resin is applied to the wedge-shaped space, that is, the groove 10.

Examples of such inorganic powders include alumina, beryllium oxide, magnesium oxide, aluminum nitride,
It is preferable to use either boron nitride or silicon carbide powder alone or in combination. Among them, boron nitride, beryllium oxide and aluminum nitride are particularly preferred from the viewpoint of conductivity.

The average particle diameter of the inorganic powder is 0.1 to 30 μm.
It is. The mixing ratio of the thermosetting resin and the inorganic powder varies depending on the properties of the inorganic powder used, for example,
100 to 200 parts by weight of inorganic powder is added to 100 parts by weight of the thermosetting resin.

As the thermosetting resin, for example, various epoxy resins can be used. However, the present invention is not particularly limited to this and can be appropriately selected. Further, it is preferable to use the same type of resin as the thermosetting resin used for the putty 12 and the thermosetting resin used for the prepreg separator 4 and the prepreg filler 5.

In this embodiment, an epoxy novolak resin (trade name: DEN438, manufactured by Dow Chemical Co., Ltd.) 70
Parts by weight, bisphenol A type epoxy resin (trade name AE
R331 30 parts by weight, curing agent (trade name B)
100 parts by weight of boron nitride powder having an average particle size of about 5 μm is used for 4 parts by weight of F3MEA manufactured by Hashimoto Kasei. The thermal conductivity of the putty 12 is about 4 W / m · K.

The putty 12 coated in the groove 10 in this manner is heated and cured while being re-formed by a hot press, and the surface of the conductor 6 is smoothed. A plurality of layers of mica tape are wound on the smoothed conductor 6, and the mica tape layer is impregnated with a thermosetting resin for impregnation under vacuum and heat-cured to form an insulating layer 7.

In the stator coil 2 having such a configuration, the groove 10 is filled with the high thermal conductive putty 12 so that
It is possible to prevent the impregnating thermosetting resin having a low thermal conductivity from being stored in the groove 10. Therefore, the thermal conductivity from the side surface of the conductor 6 to the cooling gas can be improved, and a rise in temperature can be suppressed.

The high thermal conductive putty 12 is filled with the conductor 6
Can be limited to the portion of the groove 10 formed on the surface of the insulating film, and thus does not affect the insulating thickness. Therefore, there is no need to increase the size of the stator slot, which has the advantage of contributing to downsizing of the device. In addition, the filling operation is facilitated by the putty shape, and the working efficiency is improved.

(Second Embodiment) As shown in a partially enlarged cross-sectional view of FIG.
Except for using the high thermal conductive prepreg sheet 13 instead of the putty 12 that is applied to the portion 0, it has basically the same configuration as the stator coil of the first embodiment.

The stator coil 2 of this embodiment is manufactured as follows. First, a plurality of flat rectangular insulated wires 3 are bundled,
A prepreg separator 4 in which a label is rearranged to form a coil and then a glass reinforcing tape is impregnated with a thermosetting resin.
Is inserted between the strands 30a and 30b, and the prepreg filler 5 of a thermosetting resin is arranged at the label dislocation portion.

A prepreg sheet 13 having high thermal conductivity is arranged on at least both sides of the conductor 6 formed by the bundle of the strands 3. Thereafter, the prepreg separator 4, the prepreg filler 5, and the high thermal conductive prepreg sheet 13 are heated and cured while integrally forming the bundle of the strands 3 to complete the conductor 6 having the final sectional shape.

A plurality of layers of mica tape are wound around the completed conductor 6. The mica tape layer is impregnated with a thermosetting resin for impregnation under vacuum pressure and cured by heating to form the insulating layer 7.

The high thermal conductive prepreg sheet 13 of this embodiment is obtained by applying a paint-like thermosetting resin obtained by kneading an inorganic powder having a thermal conductivity of 5 W / m · K or more to a reinforcing cloth such as a reinforcing glass cloth. It was done. Instead of coating, a reinforcing cloth may be dipped in a mixture of a thermosetting resin and an inorganic powder.

As such inorganic powder, alumina, beryllium oxide, magnesium oxide, aluminum nitride,
It is preferable to use either boron nitride or silicon carbide powder alone or in combination. Among them, boron nitride, beryllium oxide and aluminum nitride are preferred from the viewpoint of conductivity.

The average particle diameter of the inorganic powder is 0.1 to 30 μm.
It is. The mixing ratio of the thermosetting resin and the inorganic powder varies depending on the properties of the inorganic powder used, for example,
15 to 60 parts by weight of inorganic powder is added to 100 parts by weight of the thermosetting resin.

As the thermosetting resin, for example, various epoxy resins can be used. However, the present invention is not particularly limited to this and can be appropriately selected. It is preferable that the thermosetting resin used for the prepreg sheet 13 and the thermosetting resin used for the prepreg separator 4 and the prepreg filler 5 use the same type of resin.

In the present embodiment, epoxy novolak resin (trade name: DEN438, manufactured by Dow Chemical Co., Ltd.) 70
Parts by weight, bisphenol A type epoxy resin (trade name AE
R331 30 parts by weight, curing agent (trade name B)
For 4 parts by weight of F3MEA (Hashimoto Kasei), 40 parts by weight of boron nitride powder having an average particle size of about 5 μm is used. The thermal conductivity of the prepreg sheet 13 is about 1.2 W / m ·
K.

In the stator coil 2 having such a configuration, the prepreg sheet 1 in which the inorganic powder is kneaded with the thermosetting resin is used.
3 are grooves 10 on the surface of the conductor 6 due to the pressure during hot pressing.
Since the portion is densely filled, the heat conductivity from the side surface of the conductor 6 to the cooling gas is increased as in the first embodiment.

In addition, there is an advantage that the prepreg sheet 13 can be hardened simultaneously with the prepreg separator 4 and the prepreg filler 5 by hot pressing.
Further, the operability is further improved as compared with the putty 12.

(Third Embodiment) As shown in a partially enlarged cross-sectional view of FIG. 3, a stator coil according to the present embodiment employs a heat displacer instead of a prepreg filler 5 at a label dislocation portion of a conductor. It has basically the same configuration as the stator coil of the first embodiment, except that the putty 14 in which an inorganic powder having a conductivity of 5 W / m · K or more is mixed in a thermosetting resin is filled.

The stator coil 2 of this embodiment is manufactured as follows. First, a plurality of strands 3 are bundled and subjected to label transposition. Next, a prepreg separator 4 in which a thermosetting resin is impregnated in a reinforcing cloth is interposed between the strand arrays 30a and 30b.
Is inserted into the concave portion of the label dislocation portion with a putty 14 in which inorganic powder is mixed in a thermosetting resin.

Thereafter, the press putty 14 and the prepreg / separator 4 are heated and hardened while the bundle of the wires 3 is integrally formed, and the surface of the label dislocation portion of the conductor 6 is smoothed.

A plurality of layers of mica tape are wound around the completed conductor 6. The mica tape layer is impregnated with a thermosetting resin for impregnation under vacuum pressure and cured by heating to form the insulating layer 7.

The putty 14 is the same as the putty 12 used in the first embodiment. That is, the thermosetting resin 10
It uses 100 parts by weight of an inorganic powder such as boron nitride with respect to 0 parts by weight and 4 parts by weight of a curing agent, and has a thermal conductivity of about 4 W / m · K.

In addition to boron nitride, for example, alumina,
An inorganic powder having a thermal conductivity of 5 W / m · K or more, such as beryllium oxide, magnesium oxide, aluminum nitride, and silicon carbide, may be used alone or in combination with the thermosetting resin.

The average particle size of the inorganic powder is 0.1 to 30 μm.
It is. The mixing ratio of the thermosetting resin and the inorganic powder varies depending on the properties of the inorganic powder used, for example,
100 to 200 parts by weight of inorganic powder is added to 100 parts by weight of the thermosetting resin.

In the stator coil 2 having such a configuration, the label dislocation portion is filled with the high thermal conductivity putty 14 having higher thermal conductivity than the prepreg filler 5, so that the conductor 6
The thermal conductivity from the upper and lower surfaces to the cooling gas can be improved, and a rise in temperature can be suppressed.

Further, since the filling of the high thermal conductive putty 14 can be limited to the label dislocation portion of the conductor 6, there is an advantage that the insulating thickness is not affected and the stator slot size does not need to be enlarged.

The groove 10 may be filled with a high heat conductive putty 12 as in the first embodiment, or
For example, as in the second embodiment, the prepreg sheet 1
3 may be used.

(Fourth Embodiment) As shown in a partially enlarged cross-sectional view of FIG. 4, a stator coil according to this embodiment employs high heat instead of a prepreg filler 5 at a label dislocation portion of a conductor. Except that the conductive prepreg sheet 15 is used, it has basically the same configuration as the stator coil of the first embodiment.

The stator coil 2 of the present embodiment is manufactured as follows. First, after bundling a plurality of strands 3 and performing label transposition, a prepreg separator 4 in which a thermosetting resin is impregnated in a reinforcing cloth is inserted between the strand rows 30a and 30b, and the high thermal conductive prepreg sheet 15 is formed. , At least in the concave portion of the label dislocation portion of the conductor 6.

After that, the prepreg sheet 15 and the prepreg sheet 15 are heat-pressed to form the bundle of the strands 3 integrally.
The separator 4 is cured by heating to smooth the surface of the label dislocation portion of the conductor 6.

A plurality of mica tapes are wound around the completed conductor 6. The mica tape layer is impregnated with a thermosetting resin for impregnation under vacuum pressure and cured by heating to form the insulating layer 7.

The high thermal conductive prepreg sheet 15 of this embodiment is obtained by applying a paint-like thermosetting resin obtained by kneading an inorganic powder having a thermal conductivity of 5 W / m · K or more to a reinforcing cloth such as a reinforcing glass cloth. It was done. Instead of coating, a reinforcing cloth may be dipped in a mixture of a thermosetting resin and an inorganic powder.

Examples of such inorganic powders include alumina, beryllium oxide, magnesium oxide, aluminum nitride,
It is preferable to use either boron nitride or silicon carbide powder alone or in combination. Among them, boron nitride, beryllium oxide and aluminum nitride are preferred from the viewpoint of conductivity.

The average particle size of the inorganic powder is 0.1 to 30 μm.
It is. The mixing ratio of the thermosetting resin and the inorganic powder varies depending on the properties of the inorganic powder used, for example,
100 to 200 parts by weight of inorganic powder is added to 100 parts by weight of the thermosetting resin.

As the thermosetting resin, for example, various epoxy resins can be used. However, the present invention is not particularly limited to this and can be appropriately selected. It is preferable that the thermosetting resin used for the prepreg sheet 15 and the thermosetting resin used for the prepreg separator 4 use the same type of resin.

In this embodiment, the thermosetting resin 10
About 40 parts by weight of boron nitride powder having an average particle size of about 5 μm is used for 0 parts by weight. The thermal conductivity of the prepreg sheet 15 is about 1.2 W / m · K.

In the stator coil 2 having such a configuration, the label dislocation portion is filled with the high thermal conductive prepreg sheet 15 having higher thermal conductivity than the prepreg filler 5, so that the heat from the upper and lower surfaces of the conductor 6 to the cooling gas can be obtained. The conductivity can be improved and the temperature rise can be suppressed. Further, the prepreg sheet 15 has an advantage that it is easier to handle than the high thermal conductive putty 14.

The groove 10 may be filled with a high thermal conductive putty 12 as in the first embodiment, or
For example, as in the second embodiment, the prepreg sheet 1
3 may be used.

[0073]

As described above, according to the present invention,
By increasing the thermal conductivity from the coil conductor to the stator core, it is possible to provide a stator coil of a rotating electric machine capable of suppressing a rise in the temperature of the insulating coil.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view of a rotating electric machine stator coil according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of a rotating electric machine stator coil according to a second embodiment of the present invention.

FIG. 3 is a partially enlarged cross-sectional view of a rotating electric machine stator coil according to a third embodiment of the present invention.

FIG. 4 is a partially enlarged cross-sectional view of a rotating electric machine stator coil according to a fourth embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a structure of a conventional rotating electrical machine stator slot.

FIG. 6 is a partially enlarged cross-sectional view of a conventional rotating electric machine stator coil.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Stator core, 2 ... Stator coil, 3 ... Element wire, 30
a, 30b: strand of wires, 4: prepreg separator, 5
... prepreg filler, 6 ... conductor, 7 ... insulating layer, 8 ...
Spacer, 9: Slot wedge, 10: Groove, 11: Impregnated resin, 12, 14: High thermal conductive putty, 13, 15: High thermal conductive prepreg sheet.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5G303 AA10 AB20 BA12 CA01 CA09 CB01 CB02 CB04 CB17 CB19 CB30 CB43 5H603 AA04 AA09 BB12 CA01 CA05 CB02 CC17 CD22 CE02 FA05 FA12

Claims (6)

[Claims] 1. A stator coil having an insulating layer formed by integrating a plurality of rectangular insulated wires into a coil while displacing them, and impregnating and curing a resin wound on a tape wound around the coil.
A wedge-shaped space formed between the rectangular insulated wire and the resin-impregnated tape is filled and cured with a high heat conductive member containing a curable insulating admixture highly blended with an inorganic filler. Stator coil of rotating electric machine. 2. A stator coil having an insulating layer formed by integrating a plurality of rectangular insulated wires into a coil while displacing them and impregnating and curing a resin wound on a tape wound around the coil.
The gap formed between the dislocation portion of the rectangular insulated wire and the resin-impregnated tape is filled with a highly heat-conductive member containing a curable insulating admixture highly blended with an inorganic filler and cured. Characteristic stator coil of rotating electric machine. 3. The stator coil according to claim 1, wherein the rectangular insulated wires are integrated in a coil shape and are integrally cured by heating and pressing. 4. The high thermal conductivity member has a thermal conductivity of 5 W /
The stator coil according to any one of claims 1 to 3, wherein the stator coil is a putty-like member made of a thermosetting resin containing an inorganic filler of mK or more. 5. The high thermal conductive member has a thermal conductivity of 5 W /
The stator coil according to any one of claims 1 to 3, wherein the stator coil is a reinforcing cloth coated or impregnated with a thermosetting resin containing an inorganic filler of mK or more. 6. The method according to claim 1, wherein the inorganic filler is alumina (Al).
₂ O ₃ ), beryllium oxide (BeO), magnesium oxide (MgO), aluminum nitride (AlN), boron nitride (BN), and silicon carbide (SiC). The stator coil of a rotating electric machine according to any one of claims 1 to 5, wherein