JPH0681446B2 - Method for manufacturing partition plate for ventilation path of rotating electric machine - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for manufacturing a ventilation path partition plate provided at a coil end portion of a stator coil in a rotary electric machine.

[Technical background of the invention and its problems]

Generally, a rotary electric machine is provided with a cooling air circulation means in order to improve the cooling property in the equipment and to reduce the size and weight of the equipment. 2 and 3 are diagrams showing an example thereof.
FIG. 3 is a cross-sectional view of the main part of rotating electricity, and FIG. 3 is an enlarged view of the vicinity of the coil end part. As shown in FIGS. 2 and 3, a partition plate 4 is provided at the end of the stator coil 2 wound around the stator core 1, that is, at the tip of the coil end portion 3, and the inner peripheral side of the partition plate 4 is provided. The cooling fan 5 is arranged while being fixed to the rotary shaft 16, and the guide cover 6 is arranged on the outer peripheral side. An intake port 8 is provided near the end of the frame 7,
An exhaust port 9 is provided on the side of the central portion of the frame 7. Further, ventilation ducts 11 and 12 are provided on the stator core 1 and the rotor core 10.
Are provided respectively. Thus, when the cooling fan 5 is rotated, the cooling air sucked from the air inlet 8 of the frame 7 is formed by the bearing bracket 13, the guide cover 6 and the partition plate 4 as shown by an arrow A in the figure.
After passing through 14, it is fed into the ventilation passage 15 formed inside the guide cover 6 and the partition plate 4. The supplied cooling air passes through the gap G between the coils of the coil end portion 3 as shown by the arrow B, and is then discharged from the exhaust port 9 located at the back of the stator core 1.
As shown by arrows C and D, part of the cooling air passes through ventilation ducts 11 and 12 provided in the rotor core 10 and the stator core 1, respectively, and is exhausted from the exhaust port 9 of the frame 7.

Conventionally, as a method of manufacturing the above-mentioned partition plate 4, Japanese Patent Publication No.
As disclosed in Japanese Patent No. 3451, a punched insulating plate material is attached to the coil end portion 3, and a resin or the like is poured into a gap between the insulating plate material and the coil end portion 3 to fill the partition plate 4. It was fixed.

However, the conventional method of manufacturing the partition plate 4 has the following drawbacks. That is, since the stator coil 2 is formed by hand and is manually wound in the slot (not shown) of the stator core 1, the coil end portions 3 are inevitably inconsistent. Has a large variation. For this reason, the insulating plate material is processed in the actual product, and the shape and dimensions of the insulating spacers are also processed in the grinding process, resulting in a large number of finishing steps for the partition plate 4. Further, a mechanical external force due to an electromagnetic force acts on the coil end portion 3 at the time of start-up or continuous operation, but the partition plate 4 formed by the above manufacturing method cannot withstand the mechanical external force. Therefore, in order to firmly hold the coil end portions 3 to each other, it is necessary to bind them tightly with a glass tape or the like. Further, the gap between the partition plate 4 and the coil end portion 3 cannot be completely filled with resin or the like, and there is a risk that cooling air leaks from this gap and the amount of air decreases, which lowers the cooling performance.

[Object of the Invention]

It is an object of the present invention to efficiently hold the partition plate provided at the coil end portion and firmly hold the coil end portion without using a special reinforcing member, and also to increase the cooling property of the rotating electric machine and to improve reliability. An object of the present invention is to provide a method for manufacturing a partition plate for a ventilation path of a rotary electric machine that can be improved.

[Outline of Invention]

The present invention is characterized by having the following constitution in order to achieve the above object. That is, the stator core is held so that the coil end portion of the stator coil wound around the stator core faces the vertical direction, the axial center faces the vertical direction, and the coil end portion can be accommodated on the upper surface. A cylindrical container having an annular groove is arranged so as to cover the coil end portion facing downward. Then, for example, a water-soluble sand-granular insulator mainly composed of alumina sand is filled in the annular groove of the cylindrical container to such an extent that the coil end portion is submerged, and the sand-granular insulator is hardened by vibration and drying. . Thereafter, a low-viscosity cast resin mixed with carbon fiber having good wettability is injected from above, and the above-mentioned cast resin is thermally cured.
After that, the cylindrical container is removed, and the sandy granular insulating material is washed away with water to remove the sandy insulating material to form a partition plate.

Example of Invention

FIG. 1 is a diagram for explaining one embodiment of the present invention.
The same parts as those in FIG. 2 are designated by the same reference numerals, and detailed description thereof will be omitted. In FIG. 1, reference numeral 20 denotes a cylindrical container having double peripheral walls 21 and 22 and having an annular groove 23 capable of accommodating the coil end portion 3. Further, 24 is a water-soluble sand-granular insulator mainly containing, for example, alumina sand, filled in the cylindrical container 20.

When manufacturing the partition plate 4, first, as shown in FIG. 1, the stator core 1 is held so that the coil end portions 3 are oriented vertically. Next, the coil end portion 3 facing downward
The cylindrical container 20 is arranged in a state in which is housed in the annular groove 23. The sand-shaped insulating material 24 is filled in the annular groove 23 of the cylindrical container 20 to such an extent that the coil end portion 3 is submerged, and then vibrated and dried to obtain the sand-shaped insulating material
Mold and cure 24. Then, after the sand-shaped insulating material 24 is hardened, a low-viscosity cast resin mixed with carbon fibers having good wettability is injected into the upper portion of the sandy insulating material 24 to heat-harden the resin. After that, the cylindrical container 21 is removed, and the sandy granular insulating material 22 is washed away with water.
Thus, the partition plate 4 is formed at the tip of the coil end portion 3.

When the partition plate 4 is formed by such a manufacturing method, the cast resin flows into the coil end portion 3 even if there is a large variation in the cross-sectional shape of the coil end portion 3. There can be no gap between 3 and Therefore, there is no possibility that the cooling air will leak, and the amount of air flow will be larger than in the conventional case, thus improving the cooling performance. Therefore, it is possible to reduce the size and weight of the rotating electric machine. In addition, a complicated work process such as a physical matching process which is conventionally required is not required, and a resin or the like is provided in a gap between the partition plate 4 attached to the coil end portion 3 and the outer peripheral surface of the coil end portion 3. No need to embed, partition plate 4
The number of steps for molding can be remarkably reduced. Further, since the cast resin contains the reinforcing fibers, the coil end portions 3 are firmly held between each other. Therefore, even if the coil end portion 3 is not bound with glass tape or the like, the coil end portion 3 may be started or started continuously.
It is possible to withstand a mechanical external force due to an electromagnetic force acting on the stator coil, simplify the configuration, and extend the life of the stator coil 2.

〔The invention's effect〕

As described above in detail, the present invention holds the stator core so that the coil end portion of the stator coil wound around the stator core faces in the vertical direction, and has an annular groove capable of accommodating the coil end portion. The cylindrical container having the above is arranged so as to cover the coil end portion facing downward. Then, for example, a water-soluble sand-granular insulator mainly composed of alumina sand is filled in the annular groove of the cylindrical container to such an extent that the coil end portion is submerged, and the sand-granular insulator is hardened by vibration and drying. . After that, a low-viscosity casting resin mixed with carbon fiber having good wettability is injected from above, and the casting dust is thermally cured. After that, the cylindrical container is removed, and the sandy granular insulating material is washed away with water to remove the sandy insulating material to form a partition plate.

Therefore, according to the present invention, the partition plate provided on the coil end portion can be efficiently and firmly held without using a special reinforcing member, and in addition, the cooling property of the rotating electric machine can be increased and the reliability can be improved. It is possible to provide a method for manufacturing a partition plate for a ventilation path of a rotary electric machine that can improve the above.

[Brief description of drawings]

FIG. 1 is a sectional view for explaining an embodiment of the present invention, and FIGS. 2 and 3 are views for explaining a conventional example.
FIG. 3 is a sectional view of a main part of the rotating electric machine, and FIG. 3 is an enlarged view of the vicinity of the coil end part. 1 ... Stator core, 2 ... Stator coil, 3 ... Coil end part, 4 ... Partition plate, 5 ... Cooling fan, 6 ...
Guide cover, 7 ... frame, 8 ... intake port, 9 ...
Exhaust port, 10 …… Rotor core, 11,12 …… Ventilation duct, 13
…… Bearing bracket, 14 …… Intake passage, 15 …… Ventilation passage, 20
...... Cylindrical container, 23 ...... annular groove, 24 ...... sand-grain insulation.

Claims (1)

[Claims] Claim: What is claimed is: 1. A stator core of a rotating electric machine, wherein the stator core is wound so that the coil end portion of the stator coil is oriented in the vertical direction, the axial center is oriented in the vertical direction, and the coil is provided on the upper surface. A cylindrical container having an annular groove in which the end portion can be housed is arranged so as to cover the downward coil end portion, and water-soluble sand particles such as alumina sand are placed in the annular groove of the cylindrical container. Fill the insulator to the extent that the coil end part is submerged, cure the sand-grained insulator by shaking and drying, and then inject a low-viscosity cast resin mixed with carbon fiber with good wettability from above. Then, after heat-curing the casting resin, the cylindrical container is removed, and at the same time, the sand-grained insulating material is washed and removed to form a partition plate, thereby forming a partition plate for a ventilation path of a rotary electric machine. Method of manufacturing a plate.