JP2564357B2 - Rotating machine rotor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a ventilation and cooling system for a rotating electric machine, and more particularly to a ventilation system for flowing a cooling gas for cooling the stator, which is suitable for reducing and equalizing the stator temperature. The present invention relates to a rotor of a rotary electric machine provided with a groove.

[Conventional technology]

FIG. 3 shows a ventilation diagram of a turbine generator as an example of internal ventilation of a conventional rotating electric machine. The fan 6 attached to the rotor shaft 5 roughly divides the cooling gas into three directions. That is, one is from the end of the rotor body 7 to the axial direction of the rotor,
One flows into the air gap 15 between the stator inner diameter and the rotor outer diameter, and the other flows into the outer diameter side back portion of the stator core 2.

As shown in the figure, the stator core has a section in which cooling gas flows to the outer diameter side and a section in which the cooling gas flows to the inner diameter side, and is partitioned by a partition plate 4 and is connected to each section by a ventilation pipe 8. After cooling each part, these cooling gases gather in the cooler 9, undergo heat exchange, and enter the inside of the machine again.

Conventionally, in this ventilation method, as shown in FIG. 1, the cooling gas is made uniform in the axial temperature distribution by the partition plate 4,
The cold gas () and hot gas () zones are arranged alternately to make the temperature distribution inside the stator uniform.

[Problems to be Solved by the Invention]

In the above-mentioned prior art, the section of the stator core 2 shown in FIG. 3 is cooled by a hot gas in which a cooling gas for cooling the section, a cooling gas for cooling the section, and a cooling gas for cooling the rotor are mixed. Therefore, the temperature difference between the hot gas zone and the cold gas zone is 10
It occurred at about 20 degrees and could not cool the stator effectively.
The same applies to the section which is the warm gas zone. The temperature of the stator and the rotor, which are the limits when determining the size of the turbine generator, is the temperature limit first, which determines the size of the generator, but the rotor is a direct cooling system. , 100M applied to turbine generators where the stator is an indirect cooling system, especially for cogeneration
In the W-class relatively small capacity generator, the temperature of the stator is higher than that of the rotor, and the cooling structure of the stator is a limitation in determining the size of the generator.

An object of the present invention is to send a cooling gas from a rotor to a warm gas zone located at a central portion in the axial direction of the stator core 2 to effectively cool the maximum temperature of the stator.

[Means for solving the problem]

In order to achieve the above object, in addition to the ventilation groove for cooling the rotor, an air ventilation groove is provided in a place where the temperature of the cooling gas is unlikely to rise, such as the rotor teeth portion and the pole portion, and the stator temperature gas is passed through the rotor. It is achieved by centrally feeding cooling gas into the zone.

[Action]

Ventilation grooves provided in the rotor poles or the teeth create a head difference between the inner diameter side inlet and the outer diameter side outlet due to the rotation of the rotor, and the cooling gas flows and is fixed by this pump action. Cooling gas is intensively supplied to the child temperature gas zone. Since the heat generated by the resistance loss generated in the rotor conductor directly cools the conductor by the ventilation passage provided separately, the temperature rise of the cooling gas flowing through the ventilation groove provided in the pole portion or the teeth portion is small. Therefore, the cooling gas supplied to the stator temperature gas zone by the ventilation groove has a low temperature,
Stator cooling effect is increased.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, in addition to the ventilation cooling path for directly cooling the rotor winding, ventilation grooves 17 are formed in the rotor body portion 13 in the axial direction.
Is provided. Ventilation groove wedge 16 on the outer diameter side of ventilation groove 17
Is formed and forms a path for axially flowing the cooling gas taken in from the rotor end portion. Ventilation hole 18
2 is a ventilation groove wedge 16 in the stator core warm gas zone portion corresponding to the axial section and in FIG.
It is provided in.

The cooling gas exiting the fan 6 is ventilated from the rotor end.
After passing through 17, the air is discharged into the void 15 through the ventilation hole 18, the hot gas zone and the stator are cooled, and heat is exchanged by the cooler 9 to return to the fan 6.

The internal ventilation passage in this embodiment is shown in FIG. The cooling gas 19 for cooling the stator hot gas zone, which passes through the ventilation grooves provided in the rotor teeth portion, is supplied to the hot gas zone and in the rotor without the temperature rising so much.

According to this embodiment, the heat generated in the rotor coil 11 causes the cooling gas passing through the sub-slot 12 to cool the rotor coil,
Since it is directly cooled and discharged from the ventilation hole 14 to the void 15, the temperature rise of the cooling gas is small when discharged to the cooling gas void 15 passing through the ventilation groove 17. Therefore, the temperature of the cooling gas sent to the hot gas zone and the temperature of the cooling gas is lowered as a whole, and the temperature of the stator coil 3 is reduced. In the figure, 1 is a stator frame, 3 is a stator coil, 5 is a rotor shaft, and 10 is a rotor wedge.

The same effect as that of the above embodiment is obtained by using the same ventilation groove in the rotor
It can also be obtained by providing it on the rotor pole part instead of the teeth part.

〔The invention's effect〕

According to the present invention, since the cooling gas can be supplied to the hot gas zone of the highest temperature in the stator coil 3 through the ventilation groove provided in the rotor, the temperature rise of the stator coil 3 can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating ventilation of a rotor according to an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of an internal ventilation passage of a rotating electric machine of the present invention, and FIG. 3 is an internal ventilation passage of a rotating electric machine. The longitudinal cross-sectional view to demonstrate is shown. 1 ... Stator frame, 2 ... Stator core, 9 ... Cooler, 10
...... Rotor wedge, 17 …… Ventilation groove, 18 …… Ventilation hole.

Claims (1)

(57) [Claims] 1. A stator core which is laminated in the axial direction and is stacked at a constant ventilation thickness at a ventilation interval, and a partition plate which forms a ventilation path for cooling gas for cooling the stator, A stator in which hot gas zones and cold gas zones that are partitioned by partition plates are alternately arranged, and the cooling gas that cools the rotor flows from the inner diameter side of the rotor to the outer diameter side, and the inner diameter of the stator. In a rotary electric machine configured by a rotor that exhausts all into a space between the rotor and the outer diameter of the rotor, the cooling gas is blown only to the warm gas zone at the axial center of the stator. A rotor for a rotating electric machine, characterized in that a ventilation groove is provided.