JPH0427784B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a rotating electric machine, and particularly to a structure for fixing a coil within an iron core slot.

(Prior Art) Taking a stator of a large-sized rotating electrical machine as an example, a conventional technology will be described with reference to FIG.

FIG. 1 is a cross-sectional view showing the structure inside the core slot of a stator of a large rotating electric machine. In the figure, a slot bottom filler 2 is housed at the bottom of the core slot 1 of the stator, and a coil is placed on top of it. 3. The inter-coil filler 4 and the wave-shaped side spacer 5 are inserted, and finally the stator wedge 6 is firmly driven in, and the coil 3 is inserted into the slot 1.
Fixed inside.

(Problems to be Solved by the Invention) In the coil fixing structure as described above, the core slot 1 and the coil 3 are in close contact with each other only on one side surface and a portion of the wavy side spacer 5. Therefore, the heat generated in the coil 3 during operation of the rotating electric machine is transferred between the iron core slot 1 and the coil 3.
The problem is that the cooling effect is lowered, and the temperature of the coil 3 increases during operation, which adversely affects the rotating electric machine.

The present invention has been developed in view of the above-mentioned drawbacks of the prior art, and it eliminates the gap formed between the inner wall of the core slot and the coil surface, and transfers heat generated in the coil during operation from the coil surface to the core. It is an object of the present invention to provide a rotating electrical machine having a coil fixing structure that can improve the cooling effect by transmitting power.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, in a rotating electrical machine of the present invention, a coil is housed and fixed in an iron core slot. Between the inner wall and the surface of the coil, a composite side spacer is provided, which is made by covering the surface of the corrugated plate with a filler made of an elastic material, and is in close contact with the inner wall of the slot and the coil surface and does not create a gap when inserted. This is a configuration with an intervening structure.

In addition, the composite side spacer is made by laminating and molding a glass cloth using an epoxy resin containing an aromatic amine hardening agent and conductive carbon black as a binder, and then applying silicone rubber at a weight ratio of 30 to 50% to 100% of the surface of the corrugated plate. It is most effective to form the rubber elastic body by adhering a mixture of graphite powder of 1-20% and aluminum powder of 1 to 20%.

(Function) The present invention is constructed as described above, and by interposing the composite side spacer between the inner wall of the core slot and the side surface of the coil, the concave portion of the corrugated plate is filled with a filler made of an elastic material. There is no gap between the inner wall of the slot and the coil surface, and the coil can be securely fixed in the core slot, as well as improving the adhesion between the coil and the core, so the heat generated in the coil can be absorbed by the composite side spacer. It is efficiently transmitted to the iron core through

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 2 shows an example of a composite side spacer 9 used for fixing rotating electrical machine coils. The surface of the corrugated material 7 is made of a material such as silicone, which has low resistance, heat resistance, and high elasticity. A filler 8 such as rubber is applied. At this time, it is preferable to form the side surface so that there are no irregularities, but since the filling 8 of the composite side spacer 9 has elasticity, when the coil 3 is fixed by being inserted into the core slot, the filling 8 on the surface It is sufficient that the shape is formed to such an extent that it does not deform and create a gap between the inner wall of the core slot 1 and the surface of the coil 3.

FIG. 3 is a cross-sectional view of the main part of the core slot of a rotating electrical machine to which this composite side spacer 9 is applied and a coil is fixed. A slot bottom filler 2 is housed at the bottom of the core slot 1, and a slot bottom filler 2 is placed on top of it. The upper and lower coils 3, 3 are housed through the coil filler 4, and a composite side spacer 9 is inserted between the inner wall of the core slot 1 and the side surface of the coils 3, 3, and finally, the stator wedge 6 is firmly inserted. Driven upper and lower coils 3,
3 is firmly fixed in slot 1 of the iron core. Here, between iron core slot 1 and coil 3,
When the gap is 1 mm, if the height of the wave before inserting the composite side spacer 9 is set to 3 mm to 5 mm and the composite side spacer 9 is inserted, the waves of the corrugated material 7 will be crushed and the coil 3 will be attached to the inner wall of the core slot 1. At the same time as the filling 8 made of an elastic body adheres to the surface of the corrugated material 7, the inner wall of the core slot 1 and the coil 3
The gap between the coil 3 and the surface of the coil 3 is filled, and both sides of the coil 3 and the core slot 1 are brought into close contact with each other. In order to prevent electrical discharge between the inner wall of the core slot 1 and the surface of the coil 3, the surface of the coil 3 is subjected to a low resistance treatment. In order to maintain electrical continuity between the surface of the coil 3 and the core slot 1, the corrugated material 7 was formed by laminating glass cloth using an epoxy resin containing an aromatic amine curing agent and conductive carbon black as a binder. Semiconductor epoxy resin glass laminates are suitable. The filler 8 deposited on both sides of the corrugated material 7 also needs to be of low resistance in order to suppress discharge. The filler 8 suitable for the present invention includes graphite powder of 30 to 50 and aluminum powder of 1 to 20 to 100 of silicone rubber (preferably having a viscosity of about 10,000 to 60,000 poise to improve fluidity). By mixing them, a surface resistivity of 500 to 60,000 (Ω) required for suppressing discharge can be obtained.

In the stator coil of a rotating electric machine configured as described above, heat generated in the coil 3 during operation of the rotating electric machine is transferred from the entire surface of both sides of the coil 3 to the core slot 1.
As a result, the contact area is much larger than when simply inserting the wave-shaped side spacer 5 as in the past, which improves heat transfer and improves the cooling effect. Even when current is applied, the coil temperature can be maintained at the same temperature as before. In addition, since the current density can be increased, the cross-sectional area of the coil 3 can be reduced.
It is possible to downsize rotating electric machines. Furthermore, since the filler 8 has elasticity, thermal expansion of the coil 3 during operation and withering of the insulator after long-term operation,
The composite side spacer 9 can easily follow the change in dimensions due to break-in, etc., and when inserting the composite side spacer 9, even if the distance between the core slot 1 and the coil 3 differs depending on the insertion position, it will be completely filled. It is filled with thing 8.

Furthermore, since the filler 8 can be applied before inserting the composite side spacer 9 into the side surface of the coil 3, workability when inserting the composite side spacer 9 can also be improved.

[Effects of the Invention] As described above, according to the present invention, the heat generated in the coil during operation of the rotating electric machine is easily transmitted to the iron core, so that the cooling effect of the coil can be improved. Therefore, since the current density of the coil can be increased, the rotating electrical machine can be downsized by increasing the capacity of the rotating electrical machine and reducing the cross-sectional area of the coil.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the main parts to explain how the coil is fixed in the stator slot of a conventional rotating electrical machine.
Fig. 2 is a sectional view of a composite side spacer used for fixing a coil in a rotating electric machine according to an embodiment of the present invention, and Fig. 3 is a cross-sectional view of a composite side spacer used for fixing a coil in a stator slot of a rotating electric machine according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of main parts for explaining the situation. 1... Iron core slot, 2... Slot bottom filling,
3... Coil, 4... Filler between coils, 5... Corrugated side spacer, 6... Stator wedge, 7... Corrugated material, 8... Filler, 9... Composite side spacer.

Claims (1)

[Scope of Claims] 1. In a rotating electric machine in which a coil is housed and fixed in an iron core slot, a filler made of an elastic material is applied to the surface of a corrugated plate between the inner wall of the slot and the surface of the coil. A rotating electric machine characterized in that a composite side spacer is interposed therein, and the composite side spacer is in close contact with the inner wall of the slot and the surface of the coil and does not create a gap when the side spacer is interposed. 2 Composite side spacers are made by laminating and molding glass cloth using an epoxy resin containing an aromatic amine curing agent and conductive carbon black as a binder, and applying silicone rubber to the surface of the corrugated plate in a weight ratio of 100%.
2. The rotating electric machine according to claim 1, wherein a rubber elastic body is coated with a mixture of 30 to 50 parts of graphite powder and 1 to 20 parts of aluminum powder.