JPS6233825B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotor of a rotating electric machine, particularly a vertical shaft type high-speed large-capacity water turbine generator.

In general, this type of rotating electric machine uses a ventilation method in which cooling air is forced into the gap between the magnetic pole surfaces and circulated through a rim duct provided on the annular rim, using a rotor fan provided on the axial end surface of the annular rim or a separately installed blower. is being carried out.

Figure 1 shows an example of the rotor part of a conventional rotating electric machine, where 1 is the rotating shaft, 2 is the rotor spoke, and the end portion 2
a and a boss cylinder 2b. 3 is an annular rim;
4 is a salient magnetic pole, 5 is a plurality of rim ducts bored in the annular rim 3, 6 is a rotor fan, and 7 and 8 are ventilation holes.

Next, the operation will be explained. When the rotary shaft 1 rotates, the air between the rotor spokes 2 and the annular rim 3 and the air in the rotor fan 6 flow into the annular rim between the arms of the rotor spokes 2 through the ventilation holes 7 as shown by the arrows due to centrifugal force. The air flows through the rim duct 5 provided at 3 or through the ventilation opening 8, passes through the rotor fan 6, is guided to the gap between the salient magnetic poles 4, cools the field coils and the magnetic pole cores, and then connects the rotor (not shown). Cooling.

However, in the case of a high-speed, large-capacity machine, the inner diameter of the annular rim 3 needs to be reduced due to strength issues, and the rotor spokes 2 need to have greater rigidity due to vibration issues, and the outer diameter of the boss cylinder becomes larger. Therefore, the ventilation area of the ventilation openings 7 of the rotor spokes becomes small, so the ventilation resistance increases rapidly, and even if a separate blower (not shown) is provided, the necessary amount of air cannot be sent to the rim duct 5, which is a drawback. Ta.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by providing ventilation holes in the ends of the rotor spokes and the boss cylinder, and installing an electric blower inside the boss cylinder, it is possible to improve high-speed, large-capacity machines. Another object of the present invention is to provide a rotor for a rotating electrical machine that can send a necessary amount of air into a rim duct.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, parts that are the same as those in FIG. 1 are given the same reference numerals, and their explanations will be omitted. 9 is a plurality of ventilation holes drilled along the circumferential surface of the end portion 2a of the rotor spoke 2; 10 is a plurality of ventilation holes bored along the cylindrical surface of the boss cylinder 2b of the rotor spoke 2; 11 is a plurality of ventilation holes drilled along the cylindrical surface of the boss cylinder 2b of the rotor spoke 2; This is an electric blower installed coaxially with the boss cylinder 2b between ventilation holes 9 and 10 inside the boss cylinder 2b.

Next, the operation of the embodiment configured as described above will be explained. First, the introduced cooling air is branched into two directions at the upper bearing part, and part of it flows into the ventilation port 7 of the rotor spoke 2 or the ventilation port 8 of the rotor fan 6, as in the conventional case, and the remaining part flows into the end 2a of the rotor spoke 2. It enters the inside of the boss cylinder 2b through the provided ventilation hole 9, and further passes through the ventilation hole 10 provided in the boss cylinder surface.
through which it flows between the arms of the rotor spoke.

Considering the inflow area of the cooling air that flows between the arms of the rotor spoke 2, conventionally it was only at the ventilation hole 7, but according to this embodiment
Since the section is added and the air blowing is further facilitated by the electric blower 11, the inflow resistance expressed as approximately the square of the inflow wind speed decreases rapidly, making it possible to send the necessary air volume to the rim duct 5 section even in high-speed, large-capacity aircraft. Summer. Here, by providing the electric blower 11 inside the boss cylinder 2b and coaxially therewith, the following effects are also obtained. That is, especially in high-speed, large-capacity machines where cooling is more important, the diameter of the rotating shaft is increased, which is convenient because the electric blower can be easily installed. Since the electric blower and the rotating shaft are coaxial, centrifugal force due to rotation of the rotating shaft does not act on the electric blower, high mounting strength is not required, and balancing is good. Since the electric blower is disposed in a portion where the circumferential speed due to the rotation of the rotating shaft is low, the influence on the air blowing characteristics of the electric blower is reduced and the capacity of the blower can be reduced. Further, a part of an example of the arrangement of the ventilation holes 10 on the cylindrical surface of the boss is shown developed in FIG.

Although the rotor fan 6 is provided in the above embodiment, it goes without saying that the same effect can be achieved even if the rotor fan 6 is not provided or a separate blower is not provided.

Furthermore, as shown in FIG. 4, if chamfers 10a and 10b are provided at the entrance and exit of the ventilation hole 10, the inflow resistance will be further reduced and the effect will be increased.

As described above, according to the present invention, ventilation holes are provided in the ends of the rotor spokes and the boss cylinder, and an electric blower is installed inside the boss cylinder, so that the inside of the cylinder is used as a ventilation path for cooling air to flow into the rim duct. Since the ventilation resistance is made sufficiently small, it is possible to flow the required amount of air to the rim duct even in high-speed, large-capacity machines, and a highly reliable rotor of a rotating electric machine can be obtained. Furthermore, the electric blower can be easily installed and its capacity can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing a rotor section of a conventional rotating electrical machine, and FIG. 2 is a longitudinal sectional view showing a rotor section of a rotating electrical machine according to an embodiment of the present invention. Figure 3 is a developed view showing the arrangement of ventilation holes drilled in the cylindrical surface of the boss.
The figure is a longitudinal sectional view showing a rotor of a rotating electric machine according to another embodiment of the invention. 1... Rotating shaft, 2... Lotus spoke, 2a...
...End part, 2b...Boss cylinder, 3...Annular rim, 4
... salient magnetic pole, 5 ... rim duct, 6 ... rotor fan, 7 ... rotor spoke ventilation port, 8 ...
Ventilation port of rotor fan, 2a... end, 2b...
Boss cylinder, 9, 10... Ventilation hole, 10a, 10b
... Chamfer, 11 ... Electric blower.

Claims (1)

[Scope of Claims] 1. A rotor spoke 2 coupled in the axial direction of the rotor 1, an annular rim 3 attached to the outer periphery of the rotor spoke 2 and having a plurality of rim ducts 5 formed in the radial direction, and the annular rim. 3 and the boss cylinder 2 of the rotor spoke 2.
b and a ventilation hole 7 formed between the annular rim 3 and communicating with the rim duct 5, the end portion 2a of the rotor spoke 2
a plurality of ventilation holes 9 formed in the boss cylinder 2b for introducing cooling air into the boss cylinder 2b;
A plurality of ventilation holes 10 are formed in the cylindrical wall of the cylinder for causing the cooling air to flow out to the rim duct 5, and a plurality of ventilation holes 9 and 1 are formed inside the boss cylinder 2b to allow the cooling air to flow out to the rim duct 5.
A rotor for a rotating electric machine, characterized in that the rotor for a rotating electrical machine is equipped with an electric blower 11 disposed coaxially with the boss cylinder 2b between the two. 2. A rotor for a rotating electric machine according to claim 1, which includes a ventilation hole 10 with a chamfered entrance and exit.