JP2000116047A - High heat conduction insulated coil and rotary electric machine device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously satisfy high heat conductivity and a high voltage characteristics by setting a value that is obtained by dividing the standard deviation of thickness at thirty arbitrary points in the longitudinal direction of a mica insulation tape by the average value of the thickness at the same points to a specific value or less. SOLUTION: After a mica insulation tape consisting of a mica layer 2 and a layer 1 where a reinforcing material and a particle filling resin layer are in one piece is wound around a conductor 4, a pressure 6 is applied. When there is a thick part 3 at one portion of the tape, the pressure cannot be transferred to an area near it fully and hence a void 5 remains. A tape is formed, where the stiffness of a roll coater is changed in various ways and the thickness scattering of the longitudinal direction of the mica insulation tape is changed, the insulation strength of the coil is measured, and a value that is obtained by dividing the standard deviation of the thickness at thirty arbitrary points in the longitudinal direction of the mica insulation tape by the average value of the thickness at the same points is set to 0.038 or less, thus rapidly increasing the insulation strength, and establishing both of the high thermal conductivity in the thickness direction of the insulation layer and the high insulation strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated coil having both a high thermal conductivity and a high withstand voltage characteristic, and a rotating electric machine using the coil.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 63-110929 discloses an example of the prior art.
As described in Japanese Patent Application Laid-Open Publication No. H10-163, at least a material such as boron nitride, aluminum nitride, silicon nitride, aluminum oxide, magnesium oxide, beryllium oxide, and silicon carbide is used as a filler in a resin layer disposed between mica layers. 5
There was a coil having a thermal conductivity of W / mK or more and insulated with particles containing 90% by weight of the filler having a particle size in the range of 0.1 to 15 μm. However, it was difficult to achieve both a thermal conductivity of 0.4 W / mK or more in the thickness direction of the insulating layer and a dielectric strength of 25 kV / mm or more as a withstand voltage.

[0003]

Instead of manufacturing a small, high-output rotary electric machine, or using a hollow conductor for the coil to cool the interior of the coil through a coolant such as water, the coil insulating layer is not used. It is desired to produce a high-output rotary electric machine by an indirect cooling system in which air or hydrogen gas is cooled outside the device. For this purpose, it is necessary to achieve both high thermal conductivity in the thickness direction of the coil insulating layer and high withstand voltage in order to reduce the thermal resistance of the insulating layer.

An object of the present invention is to provide an insulated coil having both a high thermal conductivity and a high withstand voltage characteristic, and a rotating electric machine using the coil.

[0005]

Means for Solving the Problems The mica insulating tape used in the present invention has a laminated structure of mica, high thermal conductive filler particles having a thermal conductivity of at least 5 W / mK, and a reinforcing material on which these materials are placed. And a resin that fills these gaps. FIG. 1 shows an outline of a production flow of this mica insulating tape. First, A is prepared by mixing a predetermined amount of the high thermal conductive filler particles with the resin. Separately, mica paper pulverized and dispersed in water and formed by a paper machine and a reinforcing material are laminated with a resin to form a sheet B. Thereafter, A is coated on B using a roll coater, dried, and then cut into a tape width to complete the process.

In this mica insulating tape, a portion for maintaining high withstand voltage is a mica layer mainly composed of mica and resin, and a portion for increasing the thermal conductivity of the insulating layer is a particle-filled resin composed of highly thermally conductive filled particles and resin. Layer. The insulating layer of the coil is formed by winding a mica insulating tape composed of the above-mentioned reinforcing material, mica layer, and particle-filled resin layer around the conductor, and pressing and heating from the periphery. In order to increase the thermal conductivity of the insulating layer, it is desirable that the particle-filled resin layer composed of the high thermal conductive filler particles and the resin has as high a thermal conductivity as possible.

As the reinforcing material, a cloth, a nonwoven fabric, a film or a combination thereof is desirable. In order to increase the thermal conductivity of the particle-filled resin layer, the volume ratio of the high thermal conductive filler particles in the particle-filled resin layer may be increased.

However, when the volume ratio occupied by the high thermal conductive filler particles is increased, the viscosity of the particle-filled resin layer before the curing reaction of the resin proceeds increases. At this time, if there is a large variation in the thickness of the mica insulating tape, the thick mica insulating tape and the thin mica insulating tape are adjacent to each other when the mica insulating tape is wound around the conductor.

For this reason, the pressure is not sufficiently transmitted to the thin mica insulating tape adjacent to the thick mica insulating tape having a high viscosity, defects such as voids remain, and the dielectric breakdown strength, which is a withstand voltage characteristic, decreases. This situation will be described with reference to the schematic diagram of FIG.

FIG. 2 shows a state in which a pressure 6 is applied after winding a mica insulating tape composed of a mica layer 2 and a layer 1 in which a reinforcing material and a particle-filled resin layer are integrated around a conductor 4. If there is a thick portion 3 in a part of the tape, the pressure is not sufficiently transmitted in the vicinity thereof, and the void 5 remains.

For this reason, a tape was prepared in which the thickness of the mica insulating tape in the length direction was varied by changing the rigidity of the roll coater variously, and the dielectric breakdown strength of the coil was measured.
The value obtained by dividing the standard deviation of the thickness at any 30 locations in the length direction of the mica insulating tape by the average value of the thickness at the same location is 0.03.
It was found that the dielectric breakdown strength suddenly increased when the value was 8 or less. This has solved the problem of achieving both high thermal conductivity in the thickness direction of the insulating layer and high dielectric breakdown strength.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Example 1) Mica was dispersed in water to form mica particles, and the paper was machined with a paper machine to produce mica paper having a thickness of 0.08 mm. 0.05mm thick as reinforcement
Novolak epoxy resin 100
Sheet B was produced by bonding mica paper and a reinforcing glass cloth to a resin obtained by adding 3 parts by weight of BF3 monoethylamine to parts by weight.

Alumina particles were used as the high thermal conductive filler particles. The alumina particles had a particle diameter of 0.24 μm.
１８18.5 μm, and the average particle size is 1.6 μm. Next, the resin obtained by adding 3 parts by weight of BF3 monoethylamine to 100 parts by weight of the novolak type epoxy resin was mixed at a weight ratio of the alumina particles to the resin of 2: 1, and 15% by weight of methyl ethyl ketone was added to the mixture. In addition, resin A containing high thermal conductive filler particles was produced.

Then, according to the flow of FIG. 1, the weight ratio of the alumina particles to the total weight of the mica insulating tape is 30.
%, A resin B containing high thermal conductive filler particles was applied to a sheet B in which mica paper and a glass cloth as a reinforcing material were adhered, using a roll coater. The rigidity of the roll coater used at this time was 0.002 mm in terms of the amount of deflection at the center of the roll coater when a force of 100 N was applied to the center between the support points while supporting the support at two places of 1 m.

A sheet obtained by coating a resin B containing high thermal conductive filler particles on a sheet B in which mica paper and a glass cloth as a reinforcing material are laminated is dried, and then cut into a width of 30 mm to produce a mica insulating tape containing alumina particles. . The mica weight ratio in the mica insulating tape containing alumina particles of Example 1 was 31%, and the alumina weight ratio was 32%.

The mica weight ratio was determined by dividing the weight Wm per unit area of the mica paper used for this tape by the weight Wt1 per unit area of the mica insulating tape containing alumina particles. The alumina weight ratio is determined by heating the mica insulating tape containing alumina particles in an electric furnace at 600 ° C. for 2 hours to remove the resin from the weight Wt2 per unit area to the weight Wm per unit area of the mica paper and reinforcing material. The value obtained by subtracting the weight Wg per unit area of the glass cloth was divided by Wt1. FIG. 4 is a schematic cross-sectional view of the mica insulating tape containing alumina particles of Example 1. A mica layer 2 made of mica and resin, a glass cloth 7 as a reinforcing material, and a resin layer 8 filled with alumina particles are laminated.

[0017]

[Table 1]

The average thickness and the standard deviation were obtained by measuring the thickness of the mica insulating tape at 30 points at a pitch of about 1 m in the length direction of the tape using a micrometer, and as a result, as shown in Table 1, the average thickness was The value obtained by dividing the standard deviation by the average value at 0.290 mm was 0.032. The mica insulating tape containing the alumina particles is wound half-turned seven times around a coil conductor 10 having a cross section of 40 mm in height, 10 mm in width and 1000 mm in length shown in FIG. Originally one
After heating for 5min, pressurized at 5MPa and then 170 ℃
Then, five insulated coils on which a ground insulating layer was formed were manufactured by heating for 60 minutes. When a cross section of this ground insulating layer was observed with a microscope, no void was found as shown in the schematic cross-sectional view of FIG.

The results of measuring the dielectric breakdown voltage of the coil and the thermal conductivity of the insulating layer are shown in Example 1 of Table 1. The thermal conductivity was 0.53 W / mK and the dielectric breakdown strength was 27 kV / mm. The dielectric breakdown voltage was measured according to JIS C2116. The thermal conductivity in the thickness direction is determined by taking a disk-shaped test piece from the place where the innermost layer of the ground insulating layer is insulated by winding a PTFE film, and the temperature difference between the front and back of the test piece and the thickness of the test piece in a steady state. The thermal conductivity was calculated from the amount of heat penetrating in the direction (C-MATIC manufactured by Dynatech).

(Examples 2 and 3) Mica was dispersed in water to form mica particles, and paper was formed using a paper machine to produce mica paper having a thickness of 0.08 mm. Sheet B was prepared by bonding mica paper and reinforcing glass cloth to a resin obtained by adding a glass cloth having a thickness of 0.05 mm as a reinforcing material and adding 3 parts by weight of BF3 monoethylamine to 100 parts by weight of a novolak type epoxy resin. .

Alumina particles were used as the high thermal conductive filler particles. The alumina particles had a particle diameter of 0.24 μm.
１８18.5 μm, and the average particle size is 1.6 μm. Next, the resin obtained by adding 3 parts by weight of BF3 monoethylamine to 100 parts by weight of the novolak type epoxy resin was mixed at a weight ratio of the alumina particles to the resin of 2: 1, and 15% by weight of methyl ethyl ketone was added to the mixture. In addition, resin A containing high thermal conductive filler particles was produced.

Thereafter, according to the flow of FIG. 1, the weight ratio of the alumina particles to the total weight of the mica insulating tape is 30.
%, A resin B containing high thermal conductive filler particles was applied to a sheet B in which mica paper and a glass cloth as a reinforcing material were adhered, using a roll coater. The rigidity of the roll coater used at this time was 0.003 mm when expressed in terms of the amount of deflection at the center of the roll coater when a force of 100 N was applied to the center between the support points while supporting at two places of 1 m.
A sheet obtained by applying resin A containing high thermal conductive filler particles to a sheet B in which mica paper and a glass cloth as a reinforcing material were bonded was dried, and then cut to a width of 30 mm to produce a mica insulating tape containing alumina particles.

The weight ratio of mica in the mica insulating tape containing alumina particles of Example 2 was 31%, and the weight ratio of alumina was 30%. The mica weight ratio in the mica insulating tape containing alumina particles of Example 3 was 30%, and the alumina weight ratio was 31%. The method of calculating these weight ratios is the same as in the first embodiment. Use a micrometer to measure the thickness of the mica insulating tape at a pitch of about 1 m in the length direction of the tape.
As shown in Table 1, the average thickness was 0.287 mm for Example 2 and 0.296 mm for Example 3, and the value obtained by dividing the standard deviation by the average value was as shown in Table 1. Example 2 had 0.034 and Example 3 had 0.038.

Each of the mica insulating tapes containing alumina particles of Examples 2 and 3 was subjected to insulation treatment between wires in advance, and had a cross section of 40 mm in height, 10 mm in width and 10 mm in length in FIG.
After winding 7 times around the coil conductor 10 of 00 mm,
After heating at 15 ° C for 15 minutes, pressurizing at 5MPa and then heating at 170 ° C for 60 minutes, five insulated coils with ground insulation layer formed on Example 2 and five on Example 3 did. The results of measuring the dielectric breakdown voltage and the thermal conductivity of these coils are shown in Examples 2 and 3 in Table 1.
The thermal conductivity of Example 2 was 0.50 W / mK, and that of Example 3 was 0.5 W / mK.
It was 51 W / mK. The dielectric breakdown strength was 2 in Example 2.
7.3 kV / mm, and Example 3 was 26.8 kV / mm.
The dielectric breakdown voltage and the thermal conductivity were determined by the same method as in Example 1.

(Comparative Examples 1 to 4) Mica was dispersed in water to form mica particles, which were then formed by a paper machine to produce mica paper having a thickness of 0.08 mm. Sheet B was prepared by bonding mica paper and reinforcing glass cloth to a resin obtained by adding a glass cloth having a thickness of 0.05 mm as a reinforcing material and adding 3 parts by weight of BF3 monoethylamine to 100 parts by weight of a novolak type epoxy resin. .

Alumina particles were used as the high thermal conductive filler particles. The alumina particles had a particle diameter of 0.24 μm.
１８18.5 μm, and the average particle size is 1.6 μm. Next, the resin obtained by adding 3 parts by weight of BF3 monoethylamine to 100 parts by weight of the novolak type epoxy resin was mixed at a weight ratio of the alumina particles to the resin of 2: 1, and 15% by weight of methyl ethyl ketone was added to the mixture. In addition, resin A containing high thermal conductive filler particles was produced. Then Figure 1
According to the flow of the above, roll the resin B in which the high thermal conductive filler particles are blended into the sheet B in which the mica paper and the glass cloth of the reinforcing material are bonded so that the weight ratio of the alumina particles to the total weight of the mica insulating tape is 30%. Coated with a coater.

The rigidity of the roll coater used at this time is
When expressed by the amount of deflection of the center of the roll coater when a force of 100 N is applied to the center between the support points while supporting at intervals of 1 m, 0.0006 mm in Comparative Examples 1, 2 and 3, and 0.01 in Comparative Example 4.
It was 5 mm.

A sheet obtained by applying a resin A containing high thermal conductive filler particles to a sheet B in which mica paper and a glass cloth as a reinforcing material were bonded was dried, cut into a width of 30 mm, and then compared with Comparative Examples 1 to 4 in Table 1. A mica insulating tape containing alumina particles was manufactured. Table 1 shows the mica weight ratio and the alumina weight ratio in the mica insulating tape containing alumina particles of Comparative Examples 1 to 4. The method of calculating these weight ratios is the same as in the first embodiment.

The thickness of the mica insulating tape of Comparative Examples 1 to 4 was measured at 30 points at a pitch of about 1 m in the tape length direction using a micrometer, and the average thickness and standard deviation were obtained.
As shown in the columns of Comparative Examples 1 to 4, the average thicknesses were 0.282 mm, 0.291 mm, 0.293 mm, and 0.294 mm, respectively.
And the standard deviation divided by the average is 0.042, respectively.
0.054, 0.059, 0.098. Comparative Example 1
After winding the mica insulating tape containing alumina particles of Nos. 4 to 4 in half on a coil conductor 10 having a height of 40 mm, a width of 10 mm, and a length of 1000 mm in FIG. After heating at 110 ° C. for 15 minutes, pressurizing at a pressure of 5 MPa, and then heating at 170 ° C. for 60 minutes, five insulated coils each having a ground insulating layer of Comparative Examples 1 to 4 were manufactured.

The results of measuring the dielectric breakdown voltage and the thermal conductivity of the coils of Comparative Examples 1 to 4 are shown in Tables 1 to 4 of Comparative Examples 1 to 4. The thermal conductivity of Comparative Examples 1-4 was 0.50, 0.51 and 0.5, respectively.
Although it was 50, 0.49 W / mK, the dielectric breakdown strength was 24.3, 23.7, 22.0, 22.5 in Comparative Examples 1 to 4, respectively.
In each case, the value was 25 kV / mm or less, which was insufficient for an insulating coil. The dielectric breakdown voltage and the thermal conductivity were determined by the same method as in Example 1.

(Examples 4 and 5) Mica was dispersed in water to form mica particles, and the paper was machined with a paper machine to produce mica paper having a thickness of 0.06 mm. Sheet B was prepared by bonding mica paper and reinforcing glass cloth to a resin obtained by adding a glass cloth having a thickness of 0.05 mm as a reinforcing material and adding 3 parts by weight of BF3 monoethylamine to 100 parts by weight of a novolak type epoxy resin. .

Alumina particles were used as the high thermal conductive filler particles. The alumina particles had a particle diameter of 0.24 μm.
１８18.5 μm, and the average particle size is 1.6 μm. Next, the resin obtained by adding 3 parts by weight of BF3 monoethylamine to 100 parts by weight of the novolak type epoxy resin was mixed at a weight ratio of the alumina particles to the resin of 2: 1, and 15% by weight of methyl ethyl ketone was added to the mixture. In addition, resin A containing high thermal conductive filler particles was produced. Then Figure 1
According to the flow of the above, the resin A in which the high thermal conductive filler particles are blended into the sheet B in which the mica paper and the glass cloth of the reinforcing material are bonded together so that the weight ratio of the alumina particles becomes 40% with respect to the total weight of the mica insulating tape. Coated with a roll coater.

The rigidity of the roll coater used at this time is
100N at the center between the support points by supporting at two places of 1m distance
The amount of deflection at the center of the roll coater when the force was applied was 0.003 mm. A sheet obtained by applying a resin A containing high thermal conductive filler particles to a sheet B in which a mica paper and a glass cloth as a reinforcing material were bonded was dried, and then cut into a width of 30 mm to produce a mica insulating tape containing alumina particles.

The weight ratio of mica in the mica insulating tape containing alumina particles of Example 4 was 20%, and the weight ratio of alumina was 40%. The mica weight ratio in the mica insulating tape containing alumina particles of Example 5 was 21%, and the alumina weight ratio was 39%. The method of calculating these weight ratios is the same as in the first embodiment.

The thicknesses of the mica insulating tapes of Examples 4 and 5 were measured at a pitch of about 1 m in the longitudinal direction at 30 points using a micrometer, and the average thickness and standard deviation were obtained. The thickness is 0.314 mm in Example 4 and 0.310 mm in Example 5, and the value obtained by dividing the standard deviation by the average value is Example 4.
Was 0.037 and Example 5 was 0.034. The mica insulating tape containing alumina particles of Examples 4 and 5 was pre-insulated between wires and had a cross section of FIG.
After winding half a coil 7 times around the coil conductor 10 having a length of 1000 mm and a length of 1000 mm, the coil conductor was heated at 110 ° C. for 15 minutes, and the pressure was 5M.
After pressurizing with Pa, heating was performed at 170 ° C. for 60 minutes, and five insulated coils each having the ground insulating layer of Examples 4 and 5 were manufactured.

The results of measuring the dielectric breakdown voltage and the thermal conductivity of this coil are shown in Examples 4 and 5 in Table 1. The thermal conductivity of Example 4 was 0.60 W / mK, and that of Example 5 was 0.58 W / mK.
Met. The dielectric breakdown strength of Example 4 was 26.7 kV / m.
m, Example 5 was 26.8 kV / mm. The dielectric breakdown voltage and the thermal conductivity were determined by the same method as in Example 1.

(Examples 6 and 7) Mica was dispersed in water to form mica particles, and the paper was machined with a paper machine to produce mica paper having a thickness of 0.11 mm. Sheet B was prepared by bonding mica paper and reinforcing glass cloth to a resin obtained by adding a glass cloth having a thickness of 0.05 mm as a reinforcing material and adding 3 parts by weight of BF3 monoethylamine to 100 parts by weight of a novolak type epoxy resin. .

Alumina particles were used as the high thermal conductive filler particles. The alumina particles had a particle diameter of 0.24 μm.
１８18.5 μm, and the average particle size is 1.6 μm. Next, the resin obtained by adding 3 parts by weight of BF3 monoethylamine to 100 parts by weight of the novolak type epoxy resin was mixed at a weight ratio of the alumina particles to the resin of 2: 1, and 15% by weight of methyl ethyl ketone was added to the mixture. In addition, resin A containing high thermal conductive filler particles was produced.

Thereafter, according to the flow of FIG. 1, the weight ratio of the alumina particles to the total weight of the mica insulating tape was 20%.
%, A resin B containing high thermal conductive filler particles was applied to a sheet B in which mica paper and a glass cloth as a reinforcing material were adhered, using a roll coater. The rigidity of the roll coater used at this time was 0.003 mm in terms of the amount of deflection at the center of the roll coater when a force of 100 N was applied to the center between the support points while being supported at two places of 1 m.

A sheet obtained by coating a resin B containing high thermal conductive filler particles on a sheet B in which mica paper and a glass cloth as a reinforcing material were bonded was dried, and then cut into a width of 30 mm to produce a mica insulating tape containing alumina particles. . Example 6
The mica weight ratio in the mica insulating tape containing alumina particles is 40% and the alumina weight ratio is 20%. In Example 7, the mica weight ratio was 39%, and the alumina weight ratio was 2%.
1%. The method of calculating these weight ratios is the same as in the first embodiment.

The thicknesses of the mica insulating tapes of Examples 6 and 7 were measured at 30 points at a pitch of about 1 m in the tape length direction using a micrometer, and the average thickness and standard deviation were obtained.
The average thickness is 0.308 mm for Example 6 and 0.302 mm for Example 7, and the standard deviation divided by the average value is 0.034 for Example 6 and 0.034 for Example 7. there were.

The mica insulating tape containing alumina particles of Examples 6 and 7 was subjected to insulation treatment between wires in advance, and a coil conductor 1 having a cross section of 40 mm in height, 10 mm in width and 1000 mm in length in FIG.
After half-turning 0 and 7 turns, heating was performed at 110 ° C. for 15 minutes, then pressurized at a pressure of 5 MPa, and then heated at 170 ° C. for 60 minutes to form the ground insulating layers of Examples 6 and 7. Five insulated coils were manufactured respectively.

The results of measuring the dielectric breakdown voltage and the thermal conductivity of the coils of Examples 6 and 7 are shown in Examples 6 and 7 of Table 1. The thermal conductivity was 0.40 W / mK in Example 6 and 0.4 in Example 7.
It was 1 W / mK. The dielectric breakdown strength of Example 6 was 27.
3 kV / mm, and Example 7 was 27.3 kV / mm. In addition,
The dielectric breakdown voltage and the thermal conductivity were determined in the same manner as in Example 1.

(Examples 8 and 9) Mica was dispersed in water to form mica particles, and the paper was machined with a paper machine to produce mica paper having a thickness of 0.12 mm. Sheet B was prepared by bonding mica paper and reinforcing glass cloth to a resin obtained by adding a glass cloth having a thickness of 0.05 mm as a reinforcing material and adding 3 parts by weight of BF3 monoethylamine to 100 parts by weight of a novolak type epoxy resin. .

Boron nitride particles were used as the high thermal conductive filler particles. The boron nitride particles have a total particle size of 0.3 μm.
m to 15 μm, and the average particle size is 1.8 μm. Next, a resin obtained by adding 3 parts by weight of BF3 monoethylamine to 100 parts by weight of the novolak type epoxy resin was mixed at a weight ratio of the boron nitride particles to the resin of 3: 2, and the mixture was mixed with 15% by weight of methyl ethyl ketone. Was added to prepare a resin A containing high thermal conductive filler particles.

Then, according to the flow of FIG. 1, the weight ratio of boron nitride particles to the total weight of the mica insulating tape is 1
A resin A containing high thermal conductive filler particles was applied to a sheet B in which mica paper and a glass cloth of a reinforcing material were bonded to each other with a roll coater so as to have a concentration of 0%. The rigidity of the roll coater used at this time was 0.003 mm in terms of the amount of deflection at the center of the roll coater when a force of 100 N was applied to the center between the support points while being supported at two places of 1 m.

A sheet obtained by applying a resin A containing high thermal conductive filler particles to a sheet B in which mica paper and a glass cloth as a reinforcing material are adhered is dried, and then cut into a width of 30 mm to produce a mica insulating tape containing boron nitride particles. did. The mica weight ratio in the mica insulating tape containing boron nitride particles of Example 8 was 50%, and the boron nitride weight ratio was 10%. In Example 9, the mica weight ratio was 50%, and the boron nitride weight ratio was 10%. The method of calculating these weight ratios is the same as in the first embodiment.

The thicknesses of the mica insulating tapes of Examples 8 and 9 were measured at a pitch of about 1 m in the tape length direction at 30 points using a micrometer, and the average thickness and standard deviation were obtained.
The average thickness is 0.283 mm for Example 8, 0.285 mm for Example 9, and the standard deviation divided by the average value is 0.037 for Example 8 and 0.035 for Example 9. there were. The mica insulating tape containing boron nitride particles of Examples 8 and 9 was
The cross-section height of FIG.
Half-hung on a coil conductor 10 of 10 mm width and 1000 mm length 7
After being wound, the coil was heated at 110 ° C. for 15 minutes, then pressurized at a pressure of 5 MPa, and then heated at 170 ° C. for 60 minutes. I made each book.

The results of measuring the dielectric breakdown voltage and the thermal conductivity of the coils of Examples 8 and 9 are shown in Examples 8 and 9 in Table 1. The thermal conductivity of Example 8 was 0.40 W / mK, and that of Example 9 was 0.4.
It was 0 W / mK. The dielectric breakdown strength of Example 8 was 26.
9 kV / mm, and Example 7 was 27.0 kV / mm. In addition,
The dielectric breakdown voltage and the thermal conductivity were determined in the same manner as in Example 1.

(Embodiment 10) FIG. 6 is a partial sectional view schematically showing a rotary electric machine according to an embodiment of the present invention. The rotating electric machine includes a stator frame 100 holding a bearing 20, a stator fixed to the stator frame, and a bearing 2 inside the stator.
And a rotor rotatably supported at 0. The stator includes a stator core 30 and a stator coil 40. FIG. 7 shows a partial cross section of the stator showing a state where the stator coil 40 is incorporated in the stator core 30. The rated voltage E applied to the stator coil 40 is 11 kV.

The mica insulating tape containing alumina particles used in Example 1 was wound around the coil conductor 11 which had been subjected to insulation treatment between the wires in a half-hook manner seven times, and then a glass cloth for surface reinforcement was half-hung once. And half the low resistance corona shield layer 1
Rolled, heated at 110 ° C for 15 minutes, then pressure 5M
Pressurization was performed under Pa, and heating was performed at 170 ° C. for 60 minutes to produce a stator coil 40 to which the ground insulating layer 12 was attached.

Subsequently, the stator coil 40 was incorporated into the stator slot 50 with the glass fiber reinforced plastics plate 13 interposed between the side and bottom surfaces of the stator slot 50 of FIG. Upper and lower two-stage stator coil 4
Between 0, the interphase insulating material 14 was interposed. Stator coil 40
A glass fiber reinforced plastic sheet 17 was placed on the top, a glass fiber reinforced plastic spring 15 was inserted, and the stator coil 40 was fixed to the slot 50 using the wedge 16. After that, the stator coils 40 installed in each slot are
The connection between the coils was performed at the coil end portion 70 to reinforce the coil end portion. A rotor was incorporated into this stator to produce an indirect cooling generator using air.

In the withstand voltage test of this generator stator, a test voltage of 1000 V + 2E was applied to the rated voltage E according to JEC, and it was confirmed that the test passed. Output 47V
As a result of measuring the stator coil conductor temperature rise value during the A operation by the resistance method, the stator coil conductor temperature rise was measured by incorporating a coil in which the same generator was insulated to ground with a mica insulating tape that did not contain alumina particles. It was confirmed that the value was lower than the value by 15% or more. This means that if the same temperature rise is allowed, the output can be increased by √1.15 = 1.07 times.

[0054]

According to the present invention, it is possible to provide a high thermal conductive insulating coil having both high thermal conductivity in the thickness direction of the coil insulating layer and high withstand voltage.
It is possible to provide a small, high-output rotating electrical machine device whose output can be increased while maintaining the same amount of temperature rise.

[Brief description of the drawings]

FIG. 1 is a schematic flow chart of a process of manufacturing a mica insulating tape of the present invention.

FIG. 2 is a schematic cross-sectional view showing an insulating layer to the ground of the insulating coil of Comparative Example 1.

FIG. 3 is a schematic cross-sectional view showing an insulating layer to the ground of the insulating coil according to the first embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view of the mica insulating tape according to the first embodiment of the present invention.

FIG. 5 is a perspective view illustrating a situation in which a mica insulating tape is wound around a coil conductor that has been subjected to inter-element wire insulation processing in Examples 1 to 9 and Comparative Examples 1 to 4 of the present invention.

FIG. 6 is a schematic sectional view of a generator according to a tenth embodiment of the present invention.

FIG. 7 is a bird's-eye sectional view of the vicinity of a stator slot of a generator according to a tenth embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Layer in which reinforcing material and particle-filled resin layer were integrated, 2 ... Mica layer, 3 ... Thickness larger than average thickness, layer in which reinforcing material and particle-filled resin layer were integrated, 4 ... Conductor, 5 ... Void, 6: Insulation coil forming pressure, 7: Glass cloth, 8: Resin layer filled with alumina particles, 9: Mica insulating tape containing alumina particles,
10 ... coil conductor, 11 ... stator coil conductor, 12 ...
Ground insulating layer, 13: glass fiber reinforced plastic sheet, 14: interphase insulating material, 15: glass fiber reinforced plastic spring, 16: coil fixed wedge, 17: glass fiber reinforced plastic sheet, 20: bearing, 30: fixed Child core, 40: stator coil, 50: slot, 60: rotor core, 70: stator coil end part, 100: stator frame.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomoya Kakuda 3-1-1, Sachimachi, Hitachi-City, Ibaraki Pref. Hitachi, Ltd. Hitachi Plant (72) Inventor Mitsuru Onoda 3-1-1 Sachimachi, Hitachi-City, Ibaraki No. 1 F term in Hitachi, Ltd. Hitachi Plant (reference) 5H604 AA03 BB14 CC01 CC05 CC16 DA01 DA07 DA15 DB25 PB03

Claims (2)

[Claims] 1. 20 to 50% by weight of mica and 10 to 40% by weight of filler particles having a thermal conductivity of at least 5 W / mK, and a reinforcing material on which these materials are mounted form a laminated structure, and a gap between them is provided. In a coil in which a mica insulating tape made of resin that fills in is wound around a conductor and insulated, the standard deviation of the thickness of any 30 points in the length direction of the mica insulating tape is the average value of the thickness of the same point. A highly thermally conductive insulating coil, wherein a value obtained by dividing the value is 0.038 or less. 2. A coil whose conductor is covered with an insulating material is inserted into a slot provided in a circumferential direction of a core of a rotating electric machine, and a wedge is mounted on an upper portion of the slot to remove a coil in the slot. In a fixed rotating electric machine, 20 to 50% by weight of mica and 10 to 40% by weight of filler particles having a thermal conductivity of at least 5 W / mK or more, and a reinforcing material on which these materials are mounted form a laminated structure. The value obtained by dividing the standard deviation of the thickness at any 30 points in the length direction of the mica insulating tape made of a resin filling the gap by the average value of the thickness at the same point is 0.038 or less. A rotating electric machine using a high thermal conductive insulating coil.