JP2010154731A - Dynamo-electric machine coil and dynamo-electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a heat-dissipation properties, without impairing the electrical insulation characteristics of a dynamo-electric machine coil. <P>SOLUTION: An elastomer fiber-reinforced material 7, formed by folding a semiconductive tape material 11 in a form wrapping an elastic material 12, is wound around an insulating layer 6 for stator coils 2. A substance which is impregnated to felt by using glass as a raw material with a liquid resin as a thermal-curing thermally conductive resin composition is used as the elastic material 12. The epoxy resin is filled with an aluminum-hydroxide filler in the liquid resin for the elastic material 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine coil and a rotating electrical machine including a stator coil of a turbine generator, a turbine generator coil, for example.

  FIG. 8 is a cross-sectional view of a stator coil of a conventional rotating electrical machine coil. As shown in FIG. 8, the conventional rotating electrical machine coil is configured such that two layers of stator coils 42 are housed in slots 41a of a stator coil core 41 in which thin steel plates are laminated. The stator coil 42 is fixed in the slot 41a by a wedge 44 near the opening of the slot 41a.

  Between each stator coil 42, between the stator coil 42 near the opening of the slot 41 a and the wedge 44, and between the stator coil 42 near the bottom of the slot 41 a and the bottom, a vertical fixing material that is a spacer material 43 are arranged respectively.

  Further, a lateral fixing material 47, which is a semiconductive spacer material, is disposed between a side surface perpendicular to the opening in the slot 41a and one side surface of each stator coil 42 facing the side surface. This lateral fixing material 47 is a corrugated FRP plate (fiber reinforced plastic). Thereby, the stator coil 42 is pressed and fixed to one side surface of the slot 41a to suppress vibration during operation and the like, and heat on the surface of the stator coil 42 is transmitted to the stator coil core 41 to be dissipated.

  The stator coil 42 is arranged so that the insulating layer 46 wraps the conductor bundle 45. A heat source during operation of the rotating electrical machine is Joule heat generated by a large current flowing through the conductor bundle 45 of the stator coil 42. This Joule heat is transmitted to the stator coil core 41 through the insulating layer 46 of the stator coil 42 when the rotating electrical machine is an indirect cooling generator. A conventional rotating electrical machine coil is disclosed in Patent Document 1, for example.

  In order to increase the efficiency of the rotating electrical machine or increase the capacity of the rotating electrical machine, it is necessary to efficiently dissipate the Joule heat generation. From such a viewpoint, it is effective to increase the thermal conductivity of the insulating layer 46 of the stator coil 42 and to improve the heat transfer properties of various fixing materials.

  With respect to the main insulating layer of the stator coil, for example, as disclosed in Patent Document 2, there is a configuration in which an inorganic filler is applied to a member constituting the main insulating layer of the stator coil. As for the fixing material of the stator coil, as disclosed in Patent Document 3, for example, a material obtained by applying a heat conductive material to a semiconductive sheet is known.

JP 2003-304662 A JP 2002-374646 A Swedish Patent Application No. 406667

  In recent years, a compact and high-power generator has been demanded. In the stator coil of the generator, it is necessary to increase the current density and voltage of the conductor. However, from the viewpoint of heat dissipation, it is necessary to improve heat transfer from the stator coil to the iron core, and from the electrical viewpoint, reliable grounding of the coil surface is necessary.

  As described above, a corrugated FRP plate may be used as the lateral fixing material for fixing the coil. In this case, a certain amount of air layer is interposed between the coil surface and the iron core.

  That is, the coil surface and the iron core are in point contact when viewed microscopically, and the degree of thermal and electrical connection is low. That is, the thermal connection is insufficient from the viewpoint of heat dissipation, and the electrical connection is insufficient from the viewpoint of reliably grounding the coil surface.

  Further, individually increasing the thermal conductivity of the main insulating layer and the fixing material of the stator coil does not necessarily lead to an improvement in effective heat dissipation of the entire stator coil. In other words, the thermal resistance of the entire stator coil when heat transfer from the conductor of the stator coil to the iron core is taken into consideration is obtained from the thermal resistance obtained from the thermal conductivity of the main insulating layer and the thermal conductivity of the fixing material. Therefore, even if the thermal conductivity of the main insulation layer is very high, if the thermal conductivity of the fixing material is low, the thermal conductivity of the entire stator coil I cannot expect any improvement. That is, it is desirable that the heat conduction improvement of the main insulating layer and the heat conduction improvement of the fixed portion are achieved at the same time.

  Further, when the stator coil has the configuration disclosed in Patent Document 3 described above, the entire fixing portion is required unless the thermal conductivity of the thermal conductive material is increased according to the thermal conductivity value of the semiconductive tape material. When it sees, there exists a problem that the heat conductivity falls. Furthermore, in this configuration, if the viscosity of the heat conductive material is low, the initial heat conductivity may not be satisfied due to the internal heat conductive material flowing out before being cured.

  Therefore, an object of the present invention is to provide a rotating electrical machine coil and a rotating electrical machine that can improve the heat dissipation of the coil without impairing the electrical insulation characteristics.

  That is, the rotating electrical machine coil according to the present invention comprises a stator winding housed in a plurality of slots provided in the stator core, and a coating material wound over the longitudinal direction of the stator winding, The covering material is characterized by comprising an elastic material having a heat conductive resin composition and a semiconductive material covering the elastic material.

  ADVANTAGE OF THE INVENTION According to this invention, the heat dissipation of a coil can be improved, without impairing the electrical insulation characteristic of a rotary electric machine.

Sectional drawing of the stator coil of the rotary electric machine coil in the 1st Embodiment of this invention. Sectional drawing of the elastic fiber reinforced material in the 1st Embodiment of this invention. The figure which shows an example of the heat conductivity characteristic of the fixed object of the rotary electric machine coil in the 1st Embodiment of this invention in a table | surface form. Sectional drawing of the modification of the elastic fiber reinforced material in the 1st Embodiment of this invention. The figure which shows the chemical formula of a bisphenol A type epoxy resin. Sectional drawing of the elastic fiber reinforced material in the 5th Embodiment of this invention. Sectional drawing of the elastic fiber reinforced material in the 6th Embodiment of this invention. Sectional drawing of the stator coil of the rotary electric machine coil in the 7th Embodiment of this invention. Sectional drawing of the fixing material wound by the stator coil of the rotary electric machine coil in the 7th Embodiment of this invention. The figure which shows the measurement result of the thermal conductivity on various conditions of the fixing material wound by the stator coil of the rotary electric machine coil in the 7th Embodiment of this invention in a table format. The figure which shows the measurement result of the heat conductivity of the fixing material wound by the stator coil of the rotary electric machine coil in the 8th Embodiment of this invention in a table | surface form. The figure which shows the measurement result of the thermal conductivity on various conditions of the fixing material wound by the stator coil of the rotary electric machine coil in the 9th Embodiment of this invention in a table | surface form. The figure which shows the measurement result of the thermal conductivity on various conditions of the fixing material wound by the stator coil of the rotary electric machine coil in the 10th Embodiment of this invention in a table | surface form. Sectional drawing of the stator coil of the conventional rotary electric machine coil.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
First, a first embodiment of the present invention will be described.
FIG. 1 is a cross-sectional view of a stator coil of a rotating electrical machine coil according to a first embodiment of the present invention.
As shown in FIG. 1, the rotating electrical machine coil according to the first embodiment of the present invention has two layers of stator coils 2 in a plurality of slots 1a on the outer peripheral side of a stator coil core 1 in which thin steel plates are laminated. Each is stored. The stator coil 2 is fixed in the slot 1a by a wedge 4 near the opening of the slot 1a.

  Spacers 3 are arranged between the stator coils 2, between the stator coils 2 near the opening of the slot 1 a and the wedge 4, and between the stator coil 2 near the bottom of the slot 1 a and the bottom. . The stator coil 2 is arranged so that the insulating layer 6 wraps the conductor bundle 5. An elastic fiber reinforced material 7 is wound around the insulating layer 6 of the stator coil 2.

FIG. 2 is a cross-sectional view of the elastic fiber reinforced material in the first embodiment of the present invention.
As shown in FIG. 2, the elastic fiber reinforced material 7 includes a semiconductive tape material 11 and an elastic material 12, and the semiconductive tape material 11 is folded in half to wrap the elastic material 12.
This elastic fiber reinforced material 7 is a tape-like material, and is formed by being wound around the insulating layer 6 of the stator coil 2 over the longitudinal direction of the stator coil 2.
Here, the surface resistance of the semiconductive tape material 11 is about 500Ω. The surface resistance is not particularly limited as long as it is at least 100Ω and 5000Ω or less.

  The elastic material 12 is obtained by impregnating a felt made of glass with a liquid resin which is a room temperature or heat curable heat conductive resin composition. The felt holds the thermally conductive resin composition, and the felt material is not limited to the glass described above, but may be made of inorganic ceramics such as aluminum oxide or semiconductive carbon fiber.

  The felt material may be an insulating fiber such as polyester or polyethylene terephthalate, but from the viewpoint of heat resistance, the above-described glass, inorganic ceramics, and carbon fiber are preferable.

The liquid resin of the elastic material 12 is formed by filling an epoxy resin with an aluminum hydroxide filler. Specifically, in the liquid resin, an aluminum hydroxide filler is mixed at a ratio of 120 parts by weight with respect to 100 parts by weight of an epoxy resin containing 2 parts of an imidazole-based curing catalyst as a curing agent.
The aluminum hydroxide filler used for the liquid resin may be aluminum oxide, magnesium oxide, or boron nitride.

  When the elastic fiber reinforced material 7 is wrapped around the stator coil 2 by wrapping the elastic material 12 with the semiconductive tape material 11 as described above, and the stator coil 2 is inserted into the stator core slot 1a. The measurement result of the resistance between the stator coil 2 and the stator coil core 1 is 1000Ω.

FIG. 3 is a table showing an example of the heat conduction characteristics of the fixed body of the rotating electrical machine coil according to the first embodiment of the present invention.
As shown in FIG. 3, the measurement result of the thermal conductivity of the resin plate manufactured by curing only the liquid resin having the mixing ratio described above is 0.52 W / m · K. Moreover, the measurement result of the thermal conductivity of the elastic fiber reinforced material 7 when the stator coil 2 wound with the elastic fiber reinforced material 7 using the liquid resin in the same mixing ratio is taken out from the stator core slot 1a. Is 0.41 W / m · K.

  Next, as a comparative example, measurement of thermal conductivity when a resin plate is manufactured by curing only a liquid resin obtained by mixing aluminum hydroxide filler at a ratio of 70 parts by weight with respect to 100 parts by weight of epoxy resin. The result was 0.40 W / m · K.

  Moreover, the measurement result of the thermal conductivity of the elastic fiber reinforced material 7 when the stator coil 2 wound with the elastic fiber reinforced material 7 using the liquid resin in the same mixing ratio is taken out from the stator core slot 1a. Was 0.30 W / m · K.

  From these measurement results, it can be seen that the thermal conductivity of the higher mixing ratio of the aluminum hydroxide filler to the epoxy resin is higher than the thermal conductivity of the lower mixing ratio of the aluminum hydroxide filler to the epoxy resin. .

  As described above, in the rotating electrical machine according to the first embodiment of the present invention, the semiconductive tape material can be pressed against the stator coil surface and the stator coil core surface by the elastic force of the elastic fiber reinforced material. Good surface contact is obtained between the coil and the stator coil core, and this surface contact provides good heat transfer and electrical connection between the stator coil and the stator coil core. As a result, a stator coil fixing method that achieves both high heat transfer and reliable grounding of the stator coil surface can be realized, and a rotating electrical machine having a higher voltage and a higher cooling effect than the conventional one can be realized.

FIG. 4 is a cross-sectional view of a modification of the elastic fiber reinforced material in the first embodiment of the present invention.
In this modification, the elastic fiber reinforced material 7 is formed by folding the semiconductive tape material 11 in three, and the elastic fiber reinforced material 7 in the elastic material 12 is confronted with the stator coil 2 when wound around the stator coil 2. A part near both ends of the surface to be covered is covered with the semiconductive tape material 11 and the other part is exposed without being covered with the semiconductive tape material 11 so as to adhere to the stator coil 2. Thereby, as shown in FIG. 2, when the elastic fiber reinforced material 7 is wound around the stator coil 2 as compared with the form in which the semiconductive tape material 11 is folded in half and wraps the elastic material 12, the elasticity is increased. A portion of the material 12 that is not covered with the semiconductive tape material 11 is difficult to be exposed to the outside, and this portion adheres to the stator coil 2, thereby preventing liquid leakage of the liquid resin of the elastic material 12 to the outside. In addition, the workability when the semiconductive tape material 11 is wound around the elastic material 12 can be improved.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In addition, description of the same part as 1st Embodiment among the structures of the rotary electric machine in each following embodiment is abbreviate | omitted.
In this embodiment, a DGEBA epoxy resin is used as the epoxy resin of the elastic material 12 described in the first embodiment. The DGEBA epoxy resin is obtained by mixing 30 parts by weight of jER1001 with 70 parts by weight of jER828 (manufactured by Japan Epoxy Resin Co., Ltd.).

FIG. 5 is a diagram showing a chemical formula of a bisphenol A type epoxy resin.
jER1001 is a bisphenol A type epoxy resin in which the repeating unit n of the chemical formula shown in FIG. 5 is 1.0 or more.
Since the elastic material 12 produced in this way has higher surface adhesiveness than the first embodiment, it is easy to wind the semiconductive tape material 11 around the elastic material 12.

  Moreover, the epoxy resin of the elastic material 12 is good also as what mixed jER1001 in the ratio of 20 weight part with respect to 80 weight part of jER828. The elastic material using the epoxy resin mixed at this ratio is compared with the elastic material using the epoxy resin formed by mixing 30 parts by weight of jER1001 with respect to 70 parts by weight of jER828 described above. Although the adhesiveness is reduced, the adhesiveness is still higher than that of the first embodiment, and there is no particular trouble in operation.

  On the other hand, when an elastic material is made using an epoxy resin obtained by mixing 15 parts by weight of jER1001 with 85 parts by weight of jER828, 30 parts by weight of jER1001 with respect to 70 parts by weight of jER828. In the first embodiment, an elastic material using an epoxy resin mixed at a ratio of 20% by weight, an elastic material using an epoxy resin formed by mixing 20 parts by weight of jER1001 with 80 parts by weight of jER828, and Compared to the elastic material described above, there is almost no stickiness, and the work of winding the semiconductive tape material 11 around the elastic material 12 needs to be performed while suppressing the open portion of the semiconductive tape material 11, and the work efficiency is reduced. Resulting in.

  Therefore, a DGEBA epoxy resin is used as the epoxy resin of the elastic material 12, and the DGEBA epoxy resin is mixed with 100 parts by weight of a liquid component at a ratio of 20 parts by weight or more of a component having a repeating unit of 1.0 or more. It can be seen that the resulting elastic material has improved tackiness compared to the elastic material described in the first embodiment.

  As described above, in the rotating electrical machine coil according to the second embodiment of the present invention, the adhesiveness between the semiconductive tape material and the elastic material is improved as compared with the first embodiment. The workability when the stator coil covered with the elastic fiber reinforced material made of the material and the elastic material is placed in the slot of the stator core is improved.

(Third embodiment)
Next, a third embodiment of the present invention will be described.
In the third embodiment, after inserting the stator coil 2 wound with the elastic fiber reinforced material 7 described in the first embodiment or the second embodiment into the stator coil core 1, the elastic fiber reinforced material 7 is used. After gelling at 80 ° C. for 8 hours, secondary curing was performed at 100 ° C. for 24 hours.

  Further, as a comparative example, after inserting the stator coil 2 wound with the elastic fiber reinforced material 7 into the stator coil core 1, a curing process is performed at 100 ° C. for 24 hours without performing the primary curing of the elastic fiber reinforced material 7. Only went.

  When both were compared, in the comparative example, the liquid resin flowed out from the open portion of the semiconductive tape material 11 of the elastic fiber reinforced material 7, and the resin adhered to the gaps in the stator core slot 1a.

  On the other hand, in the case where the primary curing and the secondary curing described above were performed, there was almost no liquid resin flowing out from the open part of the semiconductive tape material 11, and adhesion of the resin to the stator core slot 1a was not recognized.

  As described above, in the rotating electrical machine according to the third embodiment of the present invention, since the elastic fiber reinforced material is gelated by primary curing, at the heat curing temperature at the time of secondary curing of the elastic fiber reinforced material. Since dripping of the heat-curable heat conductive resin composition is prevented, adhesion at the time of inserting the iron core is maintained.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described.
In the fourth embodiment, a DGEBA epoxy resin is used as the epoxy resin of the elastic material 12 described in the first embodiment. The DGEBA epoxy resin is obtained by mixing 40 parts by weight of jER1001 with 60 parts by weight of jER828. In this embodiment, the elastic fiber reinforced material 7 impregnated with the liquid resin in the mixing ratio is subjected to a drying process at 80 ° C. for 20 minutes to form the liquid resin in a prepreg shape.

  Here, for each of the elastic fiber reinforced material 7 having the configuration described in the present embodiment and the elastic fiber reinforced material 7 described in the first embodiment, the stator coil 2 around which the elastic fiber reinforced material 7 is wound is fixed. After the core coil 1 was housed, the stator coil 2 was cured.

  After the curing treatment, the stator coil 2 is taken out, and when the thickness of the elastic material 12 of the elastic fiber reinforced material 7 wound around the stator coil 2 is measured, the elastic fiber reinforced material 7 described in the present embodiment has dimensions. However, in the elastic fiber reinforced material 7 described in the first embodiment, the dimensional variation was large depending on the piece.

  As described above, in the rotating electric machine according to the fourth embodiment of the present invention, the stator coil 2 in which the elastic fiber reinforced material 7 using the liquid resin is wound by forming the liquid resin of the elastic fiber reinforced material 7 into a prepreg. Is inserted into the stator coil core 1, and the displacement of the stator coil 2 due to the contact of the contact surface is suppressed until the internal filling is cured.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described.
FIG. 6 is a cross-sectional view of the elastic fiber reinforced material in the fifth embodiment of the present invention.
As shown in FIG. 6, in this embodiment, when the elastic material 12 is wrapped with the semiconductive tape material 11, one end portion of the elastic material 12 is made semiconductive tape as compared with the configuration described in the second embodiment. The exposed portion 21 is not covered with the material 11. When the elastic fiber reinforced material 7 using the elastic material 12 having such a configuration is wound around the stator coil 2, the exposed portion 21 comes into contact with the stator coil 2. To.

  As described above, in the rotating electric machine according to the fifth embodiment of the present invention, the elastic fiber reinforced material can be wound around the stator coil such that the exposed surface of the stator coil and the elastic material adhere to each other. Workability is improved because the work can be performed while sequentially adhering during rotation, and good adhesion is maintained because the tension during winding is maintained. Therefore, it becomes very easy to wind the elastic fiber reinforced material around a stator coil having a particularly large cross section.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described.
FIG. 7 is a cross-sectional view of an elastic fiber reinforced material according to a sixth embodiment of the present invention.
As shown in FIG. 7, this embodiment has an elastic fiber reinforcement using the semiconductive tape material 11 out of the semiconductive tape material 11 of the elastic fiber reinforcing material 7 as compared with the configuration of the first embodiment. The prepreg layer 22 is formed only on the surface in contact with the stator coil 2 when the material 7 is wound around the stator coil 2.

The prepreg layer 22 is formed by applying a liquid resin obtained by mixing 40 parts by weight of jER1001 to 60 parts by weight of jER828 on the surface of the semiconductive tape material 11 that is in contact with the stator coil 2 described above. It is formed by performing a drying process for a minute.
The operation of forming the prepreg layer 22 may be performed after the elastic material 12 is wrapped with the semiconductive tape material 11 or may be formed in advance.

  As described above, in the rotating electric machine according to the sixth embodiment of the present invention, when the elastic fiber reinforced material 7 is wound around the stator coil 2 as in the fifth embodiment, the stator coil 2 and the elastic fiber are wound. Since the reinforcing material 7 adheres, workability is improved, and tension during winding is maintained, so that good adhesion is maintained. Therefore, it becomes extremely easy to wind the tape material around the stator coil having a particularly large cross section.

(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described.
FIG. 8 is a cross-sectional view of a stator coil of a rotating electrical machine coil according to a seventh embodiment of the present invention. FIG. 9 is a cross-sectional view of a fixing member wound around a stator coil of a rotating electrical machine coil according to a seventh embodiment of the present invention.
As shown in FIG. 8, in the seventh embodiment, a fixing material 30 is used instead of the elastic fiber reinforced material 7 used in the first embodiment. The fixing material 30 is a tape-like material, and is formed by being wound around the insulating layer 6 of the stator coil 2 along the longitudinal direction of the stator coil 2.

As shown in FIG. 9, the fixing material 30 includes a semiconductive tape material 31 and an internal filler 32, and the semiconductive tape material 31 is folded in half to wrap the internal filler 32.
The semiconductive tape material 31 has a thermal conductivity of 0.12 W / m · K or less and a thickness of 0.1 mm or less. The internal filler 32 is made of silicone rubber.

In the pattern A which is one form of the fixing material 30 in the seventh embodiment of the present invention, the thermal conductivity of the silicone rubber as the internal filler 32 is 0.50 W / m · K, and the viscosity is 40 Pa · s. .
Further, in the pattern B which is another form of the fixing material 30 (comparative example in the seventh embodiment of the present invention), the thermal conductivity of the silicone rubber as the internal filler 32 is 0.26 W / m · K, and the viscosity Is 50 Pa · s.

  Furthermore, in the pattern C which is another form of the fixing material 30 (comparative example in the seventh embodiment of the present invention), the thermal conductivity of the silicone rubber which is the internal filler 32 is 0.60 W / m · K, The viscosity is 9 Pa · s.

  The measurement result of the thermal conductivity of the fixing material 30 in each of these forms is shown. In this embodiment, the thermal conductivity of the insulating layer 6 that is the main insulating layer is 0.2 to 0.3 W / m · K. Therefore, the heat conductivity of the fixing material 30 is required to be 0.3 W / m · K or more from the viewpoint of heat dissipation of the insulating portion composed of the insulating layer 6 and the fixing material 30.

FIG. 10 is a diagram showing, in a tabular form, measurement results of thermal conductivity under various conditions of the fixing material wound around the stator coil of the rotating electrical machine coil according to the seventh embodiment of the present invention.
As shown in FIG. 10, the thermal conductivity of the fixing material 30 of the pattern A is 0.30 W / m · K, which is equal to or higher than the thermal conductivity of the insulating layer 6.
In the configuration of Pattern B, the heat conductivity of the fixing material 30 is 0.13 W / m · K, which is less than the heat conductivity of the insulating layer 6.

  In the configuration of the pattern C, the heat conductivity of the fixing material 30 is 0.25 W / m · K, which is lower than the heat conductivity of the insulating layer 6. This is because the viscosity of the silicone rubber is a low value of less than 40 Pa · s, so that the silicone rubber leaks out from the gap until it solidifies, so that a cavity is generated inside the insulating material 30 or is insulated. This is because the thermal conductivity of the fixing member 30 is lowered because the contact with the layer 6 cannot be maintained.

  From these results, among the patterns A, B, and C, the configuration of the fixing material 30 suitable for use as an insulating portion in combination with the insulating layer 6 having a thermal conductivity of 0.2 to 0.3 W / m · K. Is a pattern A.

  As described above, in the rotary electric machine according to the seventh embodiment of the present invention, the thermal conductivity of the silicone rubber that is the internal filler 32 of the fixing material 30 is 0.50 W / m · K or more, and the viscosity is 40 Pa · s. In the case described above, the thermal conductivity of the fixing member 30 is 0.3 W / m · K or more, so the thermal conductivity of the insulating layer 6 of the stator coil 2 is 0.2 to 0.3 W / m · K. In this case, the same level of thermal conductivity as that of the insulating layer 6 of the fixing material 30 can be realized. When such an internal filler 32 made of silicone rubber is used, the insulating layer 6 of the stator coil when the internal filler 32 is wrapped with a semiconductive tape material 31 and the insulating layer 6 of the stator coil is wrapped. The insulating portion formed of the layer 6 and the fixing material 30 has a heat dissipation property that allows necessary and sufficient heat transfer from the conductor of the stator coil to the iron core. Therefore, the rotating electric machine has a higher cooling effect than the conventional one. Can be realized.

(Eighth embodiment)
Next, an eighth embodiment of the present invention will be described. The cross section of the stator coil of the rotating electrical machine coil in this embodiment is the same as that in the seventh embodiment. However, the thermal conductivity of the insulating layer 6 as the main insulating layer is 0.3 to 0.5 W / m · K. Therefore, the heat conductivity of the fixing material 30 is required to be 0.5 W / m · K or more from the viewpoint of heat dissipation of the insulating portion formed by the insulating layer 6 and the fixing material 30.
In the pattern D that is the fixing material 30 in the eighth embodiment of the present invention, the thermal conductivity of the silicone rubber that is the internal filler 32 is 0.70 W / m · K, and the viscosity is 40 Pa · s as in the pattern A. is there.

FIG. 11 is a table showing the measurement results of the thermal conductivity of the fixing material wound around the stator coil of the rotating electrical machine coil according to the eighth embodiment of the present invention.
As shown in FIG. 11, the thermal conductivity of the fixing member 30 of the pattern D is 0.50 W / m · K, and thus is equal to or higher than the thermal conductivity of the insulating layer 6. From this result, it can be seen that the fixing material 30 having the pattern D is suitable for use as an insulating portion combined with the insulating layer 6 having a thermal conductivity of 0.3 to 0.5 W / m · K.

  As described above, in the rotary electric machine according to the eighth embodiment of the present invention, the thermal conductivity of the silicone rubber that is the internal filler 32 of the fixing material 30 is 0.70 W / m · K or more, and the viscosity is 40 Pa · s. In the case described above, the thermal conductivity of the fixing material 30 is 0.50 W / m · K or more, so that the thermal conductivity of the insulating layer 6 of the stator coil 2 is 0.3 to 0.5 W / m · K. In this case, the same level of thermal conductivity as that of the insulating layer 6 of the fixing material 30 can be realized. When such an internal filler 32 made of silicone rubber is used, the insulating layer 6 of the stator coil when the internal filler 32 is wrapped with a semiconductive tape material 31 and the insulating layer 6 of the stator coil is wrapped. The insulating portion formed of the layer 6 and the fixing material 30 has a heat dissipation property that allows necessary and sufficient heat transfer from the conductor of the stator coil to the iron core. Therefore, the rotating electric machine has a higher cooling effect than the conventional one. Can be realized.

(Ninth embodiment)
Next, a ninth embodiment of the present invention will be described. The cross section of the stator coil of the rotating electrical machine coil in this embodiment is the same as that of the seventh embodiment, and the thermal conductivity of the insulating layer 6 as the main insulating layer is 0.2-0. 3 W / m · K. Therefore, the heat conductivity of the fixing material 30 is required to be 0.3 W / m · K or more from the viewpoint of heat dissipation of the insulating portion composed of the insulating layer 6 and the fixing material 30.

  In the pattern E which is one form of the fixing material 30 in the ninth embodiment of the present invention, the thermal conductivity of the silicone rubber as the internal filler 32 is 0.26 W / m · K, and the viscosity is 50 Pa · s. These characteristics are the same as those of the pattern B described in the seventh embodiment. However, in the pattern E, 100 parts by weight of an aluminum hydroxide filler is added.

  Moreover, in the pattern F which is another form of the fixing material 30 in the ninth embodiment of the present invention, the thermal conductivity and viscosity of the silicone rubber which is the internal filler 32 are the same as those in the pattern B. However, in the pattern F, 80 parts by weight of aluminum hydroxide filler is added.

  Furthermore, in the pattern G which is another form of the fixing material 30 in the ninth embodiment of the present invention (comparative example in the ninth embodiment of the present invention), the thermal conductivity and viscosity of the silicone rubber which is the inner filler 32 are used. Is the same as pattern B. However, in the pattern G, 50 parts by weight of aluminum hydroxide filler is added.

  The measurement result of the thermal conductivity of the fixing material 30 in each of these forms is shown. FIG. 12 is a diagram showing, in a tabular form, measurement results of thermal conductivity under various conditions of the fixing material wound around the stator coil of the rotating electrical machine coil according to the ninth embodiment of the present invention.

As shown in FIG. 12, in the configuration of the pattern E, the thermal conductivity of the fixing member 30 is 0.32 W / m · K, which is equal to or higher than the thermal conductivity of the insulating layer 6.
In the configuration of the pattern F, the heat conductivity of the fixing material 30 is 0.30 W / m · K, which is equal to or higher than the heat conductivity of the insulating layer 6.
In the configuration of the pattern G, the heat conductivity of the fixing material 30 is 0.22 W / m · K, which is lower than the heat conductivity of the insulating layer 6.

  Further, when trying to mix the aluminum hydroxide filler in excess of 120 parts by weight with respect to the fixing material 30, the viscosity becomes too high, the workability is remarkably lowered, and the trial manufacture of the coil is difficult.

  From these results, among the patterns E, F and G, the patterns E and F are suitable for use in combination with the insulating layer 6 having a thermal conductivity of 0.2 to 0.3 W / m · K. I understand that.

  As described above, in the rotary electric machine according to the ninth embodiment of the present invention, when the thermal conductivity of the insulating layer of the stator coil is 0.2 to 0.3 W / m · K, the inner filling of the fixing material 30 is performed. When the thermal conductivity of the silicone rubber as the material 32 is 0.2 to 0.3 W / m · K, the viscosity is 50 Pa · s or more, and 80 to 100 parts by weight of an aluminum hydroxide filler is further added The thermal conductivity of the fixing material 30 is 0.3 W / m · K or higher, and the thermal conductivity of the insulating layer 6 is higher. When such an internal filler 32 made of silicone rubber is used, the insulating layer 6 of the stator coil when the internal filler 32 is wrapped with the semiconductive tape material 31 and the insulating layer 6 of the stator coil is wrapped. The insulating portion composed of the layer 6 and the fixing member 30 has a heat dissipating property that allows necessary and sufficient heat transfer from the conductor of the stator coil to the iron core. Can be realized. In this configuration, it is possible to realize a coil having good heat dissipation without impairing workability during the above-described application and insertion operations. Further, as in the seventh embodiment, even if the thermal conductivity of the silicone rubber used for the inner filler 32 is 0.2 to 0.3 W / m · K, the necessary and sufficient amount from the conductor of the stator coil to the iron core is sufficient. Heat transfer can be realized.

(Tenth embodiment)
Next, a tenth embodiment of the present invention will be described. The cross section of the stator coil of the rotating electrical machine coil in this embodiment is the same as that in the seventh embodiment. However, the thermal conductivity of the insulating layer 6 as the main insulating layer is 0.3 to 0.5 W / m · K, as in the eighth embodiment. Therefore, the heat conductivity of the fixing material 30 is required to be 0.5 W / m · K or more from the viewpoint of heat dissipation of the insulating portion formed by the insulating layer 6 and the fixing material 30.

  In the pattern H which is one form of the fixing material 30 in the ninth embodiment of the present invention, the thermal conductivity of the silicone rubber as the internal filler 32 is 0.70 W / m · K, and the viscosity is 40 Pa · s. These are the same as the pattern D described in the eighth embodiment. However, in the pattern H, 20 parts by weight of aluminum hydroxide filler is added.

  In the pattern I which is another form of the fixing material 30 in the ninth embodiment, the thermal conductivity of the silicone rubber as the internal filler 32 is 0.70 W / m · K, and the viscosity is 40 Pa · s. These are the same as pattern D. However, in the pattern I, 50 parts by weight of aluminum hydroxide filler is added.

  The measurement result of the thermal conductivity of the fixing material 30 in each of these forms is shown. FIG. 13: is a figure which shows the measurement result of the thermal conductivity on various conditions of the fixing material wound by the stator coil of the rotary electric machine coil in the 10th Embodiment of this invention in a table | surface form.

As shown in FIG. 13, in the configuration of the pattern H, the heat conductivity of the fixing member 30 is 0.56 W / m · K, which is equal to or higher than the heat conductivity of the main insulating layer.
Moreover, in the structure of the fixing material 30 of the pattern I, since the thermal conductivity is 0.58 W / m · K, it is equal to or higher than the thermal conductivity of the main insulating layer.

Moreover, when it tried to mix aluminum hydroxide filler exceeding 50 weight part, a viscosity became high too much and workability | operativity fell remarkably.
From these results, it can be seen that the patterns H and I are suitable for use in combination with the insulating layer 6 having a thermal conductivity of 0.3 to 0.5 W / m · K.

  As described above, in the rotating electric machine according to the tenth embodiment of the present invention, when the thermal conductivity of the insulating layer of the stator coil is 0.3 to 0.5 W / m · K, the inner filling of the fixing material 30 is performed. When the thermal conductivity of the silicone rubber as the material 32 is 0.7 W / m · K, the viscosity is 40 Pa · s or more, and 20 to 50 parts by weight of an aluminum hydroxide filler is further added, the fixing material 30 The thermal conductivity is 0.5 W / m · K or higher, which is higher than the thermal conductivity of the insulating layer 6. When such an internal filler 32 made of silicone rubber is used, the insulating layer 6 of the stator coil when the internal filler 32 is wrapped with a semiconductive tape material 31 and the insulating layer 6 of the stator coil is wrapped. The insulating portion formed of the layer 6 and the fixing material 30 has a heat dissipation property that allows necessary and sufficient heat transfer from the conductor of the stator coil to the iron core. Therefore, the rotating electric machine has a higher cooling effect than the conventional one. Can be realized. Further, in this configuration, it is possible to realize a coil having good heat dissipation without impairing workability during the above-described application and insertion work.

  The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be omitted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  DESCRIPTION OF SYMBOLS 1,41 ... Stator coil iron core, 2,42 ... Stator coil, 3 ... Spacer material, 4,44 ... Wedge, 5,45 ... Conductor bundle, 6,46 ... Insulating layer, 7 ... Elastic fiber reinforcement material, 11 31 ... Semiconductive tape material, 12 ... Elastic material, 21 ... Exposed part, 22 ... Prepreg layer, 32 ... Internal filler, 43 ... Longitudinal fixing material, 47 ... Lateral fixing material.

Claims (15)

A stator winding housed in a plurality of slots provided in the stator core;
A coating material wound over the length of the stator winding,
The said coating material is comprised with the elastic material which has a heat conductive resin composition, and the semiconductive material which covered this elastic material, The rotary electric machine coil characterized by the above-mentioned. The rotating electrical machine according to claim 1, wherein the thermal conductive resin composition is a room temperature or heat curable thermal conductive resin composition having a thermal conductivity of 0.50 W / m · K or more. coil. 3. The rotating electrical machine coil according to claim 2, wherein the elastic material is composed of the heat conductive resin composition and a felt for holding the heat conductive resin composition. The rotating electric machine coil according to claim 3, wherein the felt is made of glass, insulating ceramics, or carbon fiber. The thermal conductive resin composition is made of DGEBA epoxy and contains 20 parts by weight or more of a component having a repeating unit of 1.0 or more with respect to 100 parts by weight of the liquid component of the DGEBA epoxy. The rotating electrical machine coil according to any one of claims 1 to 4. The coating material is
After the stator winding wound with the coating material is housed in the slot, the coating material is gelled by primary curing and then secondarily cured at a temperature higher than the primary curing. The rotating electrical machine coil according to any one of claims 1 to 5, wherein: The rotating electrical machine coil according to claim 5, wherein the thermally conductive resin composition of the coating material is a prepreg. The rotating electrical machine coil according to claim 5, wherein a part of the thermally conductive resin composition is exposed without being covered with the semiconductive material. The rotating electrical machine coil according to claim 1 or 8, wherein the covering material covers the elastic material in two or three. The rotating electrical machine coil according to claim 5, wherein a prepreg layer of the thermally conductive resin composition is formed on a surface of the semiconductive material that contacts the stator coil surface. The elastic material is a silicone rubber having a viscosity of 40 Pa · s or more,
The rotating electrical machine coil according to claim 2, wherein a thermal conductivity of an insulating layer of the stator winding is 0.2 to 0.3 W / m · K. The elastic material is a silicone rubber having a thermal conductivity of 0.70 W / m · K or more and a viscosity of 40 Pa · s or more.
The rotating electrical machine coil according to claim 2, wherein a thermal conductivity of an insulating layer of the stator winding is 0.3 to 0.5 W / m · K. The thermally conductive resin composition is a silicone rubber filled with 80 to 100 parts by weight of an aluminum hydroxide filler, having a thermal conductivity of 0.2 to 0.3 W / m · K and a viscosity of 50 Pa · s or more. Yes,
The rotating electrical machine coil according to claim 1, wherein the insulating layer of the stator winding has a thermal conductivity of 0.2 to 0.3 W / m · K. The rotating electrical machine coil according to claim 12, wherein the silicone rubber is filled with 20 to 50 parts by weight of an aluminum hydroxide filler.   A rotating electrical machine comprising the rotating electrical machine coil according to any one of claims 1 to 14.

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