JPH01274639A - Rotor for electrical rotating machine - Google Patents

Abstract

PURPOSE:To cool a stator also at its temperature peak effectively, by providing a ventilating groove at the place of a rotor such as a rotor teeth part, where a cooling gas temperature is hard to rise, separately from a rotor cooling ventilating groove and by feeding a cooling gas from said rotor into a warm gas zone in the axially central part of a stator core. CONSTITUTION:In addition to a ventilating cooling path for directly cooling a rotor winding 11, a rotor body teeth 13 is axially provided with a ventilating groove 17. A ventilating groove wedge 16 is inserted into the outer diameter side of said ventilating groove 17 to form a path for axially passing a cooling gas taken in from a rotor end part. Ventilating holes 18 are provided at the ventilating groove wedge 16 of the stator core warm gas zone part corresponding to axial sections D and B. Said cooling gas coming from a fan 6 passes the ventilating groove 17 from the rotor end part, is discharged from the ventilating holes 18 to air gaps 15, cools the stators of said warm gas zones D and B, exchange heat by a cooler 9, and returns to the fan 6. Thus, it is possible to decrease the temperature rise of a stator coil 3.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a ventilation and cooling method for a rotating electric machine, and in particular, to a ventilation groove for flowing cooling gas for cooling a stator, which is suitable for reducing and equalizing stator temperature. The present invention relates to a rotor of a rotating electrical machine provided with a rotor.

[Conventional technology]

FIG. 3 shows a ventilation diagram of a turbine generator as an example of internal ventilation of a conventional rotating electric machine. A fan 6 attached to the rotor shaft 5 divides the cooling gas into three main directions. That is, one direction is from the end of the rotor body 7 toward the rotor internal axis direction, one direction is toward the gap 15 between the stator inner diameter and the rotor outer diameter, and the other direction is toward the outside of the stator core 2. Each flows to the radial dorsal region.

As shown in the figure, the stator core has a section in which the cooling gas flows toward the outer diameter and a section in which the cooling gas flows toward the inner diameter, which are partitioned by a partition plate 4 and 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 machine again.

Conventionally, this ventilation method is as shown in Fig. 1.

Cold gas (■ ◎ [F]) and hot gas (■■) zones are arranged alternately so that the temperature distribution in the axial direction of the cooling gas is uniform through the partition plate 4, and the temperature distribution inside the stator is uniform. We are trying to make this happen.

[Problem to be solved by the invention]

In the above conventional technology, section ◎ of the stator core 2 in FIG.
] and the cooling gas that cooled the rotor are mixed together to cool the rotor. Therefore, the temperature difference between the hot gas zone ◎ and the cold gas zone ◎ (◎) conventionally occurred by about 10 to 20 degrees, making it impossible to effectively cool the stator. This also applies to section (2), which is the hot gas zone. The temperature of the stator and the rotor, which are the limiting factors in determining the physique of a turbine generator, first becomes the temperature limit and determines the physique of the generator. In turbine generators in which the stator is indirectly cooled, especially in relatively small capacity generators of the 100 MW class used for cogeneration etc., the stator temperature is higher than the rotor, and the stator cooling structure is was a limitation in determining the generator size.

An object of the present invention is to send cooling gas from a rotor to a hot gas zone located in the axial center of the stator core 2 to effectively cool the highest temperature point of the stator.

[Means to solve the problem]

In order to achieve the above objective, in addition to the ventilation grooves for rotor cooling, ventilation grooves are provided in places where the temperature of the cooling gas is difficult to rise, such as the rotor teeth and poles, and the cooling gas is passed through the rotor to the stator temperature zone. This is achieved by intensively pumping cooling gas into the

[Effect]

The ventilation grooves provided in the rotor poles or teeth create a head difference between the inner diameter inlet and outer diameter outlet due to the rotation of the rotor, and this pump action causes cooling gas to flow and reduce the stator temperature. Supply cooling gas centrally to the gas zone. Since the heat generated by the resistance loss generated in the rotor conductor is directly cooled by the separately provided ventilation passage, the temperature rise of the cooling gas flowing through the ventilation groove provided in the pole part or the tee entry part is small. Therefore, the cooling gas supplied to the stator warm gas zone through the ventilation grooves has a low temperature, and the 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 that directly cools the rotor windings, the first rotor teeth 13 have ventilation grooves 1 in the axial direction.
7 is provided. A ventilation groove wedge 16 is inserted into the outer diameter side of the ventilation groove 17 to form a path through which the cooling gas taken in from the rotor end flows in the axial direction. In FIG. 2, the ventilation holes 18 are located in the axial sections ◎ and ■.
It is provided in the ventilation groove wedge 16 of the stator core warm gas zone portion corresponding to the stator core.

The cooling gas leaving the fan 6 is routed through the rotor end through the ventilation groove 1.
7, is discharged from the ventilation hole 18 into the gap 15, cools the stators in the hot gas zones ◎ and ▪, exchanges heat with the cooler 9, and returns to the fan 6.

In this example. The internal ventilation path is shown in Figure 2. The cooling gas 19 for cooling the stator hot gas zone passing through the ventilation grooves provided in the rotor teeth is supplied to the hot gas zones ■ and ◎ without much temperature rise in the rotor.

According to this embodiment, the heat generated in the rotor coil 11 is directly cooled by the cooling gas passing through the sub-slots 12 and is discharged into the air gap 15 through the ventilation holes 14, so that the heat is passed through the ventilation grooves 17. The temperature rise of the cooling gas when discharged into the cooling gas gap 15 is small. Therefore, hot gas zone◎
The temperature of the cooling gas sent to (1) and (2) is lowered overall, which has the effect of lowering the temperature of the stator coil 3. In addition, in the figure, 1 is a stator frame, 3 is a stator coil, 5 is a rotor shaft, 1
0 is the rotor wedge.

The same effect as in the above embodiment can be obtained even if similar ventilation grooves are provided in the rotor pole part instead of in the rotor teeth part.

〔Effect of the invention〕

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

[Brief explanation of the drawing]

FIG. 1 is a perspective view illustrating the ventilation of a rotor according to an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of an internal ventilation path of a rotating electrical machine of the invention, and FIG. A longitudinal cross-sectional view for explanation is shown. DESCRIPTION OF SYMBOLS 1... Stator frame, 2... Stator core, 9... Cooler, 10... Rotor wedge, 17... Ventilation groove, 1
8...Ventilation hole. Figure 1 Figure 2

Claims (1)

[Claims] 1. A stator core that is stacked in the axial direction and is stacked at substantially constant intervals for ventilation between each stack, and a partition plate that creates a ventilation path for cooling gas that cools the stator. , a stator in which hot gas zones and cold gas zones partitioned by the partition plates are arranged alternately, and the cooling gas for cooling the rotor flows from the inner diameter side to the outer diameter side of the rotor, and In a rotating electric machine including a rotor that exhausts all of the gas into a gap between an inner diameter of the stator and an outer diameter of the rotor, the cooling gas is only discharged into the hot gas zone located in the axial center of the stator. A rotor for a rotating electrical machine characterized by having ventilation grooves for blowing air.