JPH0452060B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a vertical one-sided ventilation type fully enclosed salient pole rotating electrical machine with an improved ventilation cooling structure.

[Technical background of the invention and its problems]

In low-speed, large-diameter vertical rotating electric machines, a structure is often adopted in which the rotor spider and rotor yoke have a fan effect, and the fan effect cools the rotor through ventilation in the radial direction. One side ventilation type, which is one of these structures, will be explained with reference to FIGS. 1 and 2.

Below the rotor 1 is a rotating shaft 2, a bearing 3 supporting the rotating shaft 2, and a bracket 4 and a bracket arm 5 supporting the bearing 3. The rotor 1, the stator 6 and the bracket arm 5 are surrounded by an upper jacket 7, a lower jacket 8 and a wall 9. A rotor spider 10 of the rotor 1 has a fan-like shape, and a flange 11 is ring-shaped, and the center side is open to an in-machine ventilation passage 12. The lower flange 13 has a ventilation hole 14 near its inner circumference. The spaces 16 between the spokes 15 in the rotor spider 10 connect the magnetic poles 19, 19 with ventilation ducts 18 provided radially in the rotor yoke 17.
The ventilation duct 18 during operation communicates with the space 20 between the
Due to the fan action of the spokes 15 in the rotor spider 10, the upper flange 1 of the rotor spider 10
The in-machine air flowing in from the center-side upper opening 21 of the magnetic head 1 is radially blown into the space 20 between the magnetic poles. The stator 6 is provided with an annular stator core 24 inside a stator frame 23.
A stator winding 25 is wound in a slot (not shown). Further, a cooler 26 is disposed at the back of the stator frame 23, and the inlet side of the cooler 26 is formed by dividing the stator core 24 in the axial direction through an air chamber 27 of the stator frame 23. It communicates with the radial stator duct 28. That is, the in-machine air sent from the inside of the rotor spider 1 of the rotor 1 into the interpole space 20 passes through the stator duct 28 of the stator core 24, cools the stator core 24 and the stator winding 25, and cools the stator core 24 and the stator winding 25. The air passing through the duct 28 enters the cooler 26 through the air chamber 27 of the stator frame 23. Ventilation guide plates 30 and 31 are provided at the axial ends of the stator 6, respectively.
are attached to the guide plates 30 and 31, and the guide plates 30 and 31 direct the air that is axially divided from the interpole space 20 of the stator 1 into the air chamber from the ventilation holes 32 of the stator frame 23 along the ends of the stator windings 25. cooler 26 via 27 or directly
The ends of the stator windings 25 are thereby cooled. The air cooled through the cooler 26 is circulated into the rotor spider 10 through an internal ventilation passage 12 formed between the upper guide ventilation plate 30 and the upper jacket 7. In this case, the air cooled through the cooler 26 is not circulated from inside the rotor spider 10 to the lower part of the rotor 1 and stator 6, and the somewhat warm air exits into the space 20 between the magnetic poles. is sucked out from the gap 33 between the lower ventilation guide plate 31 and the rotor 1, and is sucked into the rotor spider 10 through the ventilation hole 14 provided near the inner circumferential side of the lower flange 13 by the fan action of the rotor spider 10. It will be done. These air flows are indicated by arrows in FIG. When the air entering through the ventilation hole 14 is at a low temperature, it is good because it cools the bracket arm 5, but when the output becomes high and the temperature becomes high, the high temperature air warms the bracket arm 5, causing the bracket arm 5 to thermally expand. , the position of the bearing 3 supported by the bracket arm 5 may shift, or the mounting portion between the bracket arm 5 and the wall 9 may shift, causing vibrations.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a fully enclosed rotary electric machine with ventilation on one side, which can prevent the phenomenon in which the bracket arm becomes hot and causes abnormal vibrations.

[Summary of the invention]

In the present invention, by eliminating the warm air intake vent provided near the inner periphery of the lower flange of the rotor spider and providing air discharge holes near the outer periphery of the lower flange, the low temperature air cooled by the cooler is removed. This prevents the temperature of the bracket arm from rising by discharging it from the air release hole to the bracket arm side.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. In FIGS. 3 and 4, the same parts as in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted.

In this embodiment, a ventilation hole 1 that was conventionally provided near the inner circumference of the lower flange 13 of the rotor spider 10 is used.
4 is eliminated, and an air release hole 34 is provided near the outer periphery of the lower flange 13. The rest is the same as the conventional example shown in FIGS. 1 and 2.

Next, the effect will be explained.

The cold air cooled by the cooler 26 and flowing into the rotor spider 10 from above the center side of the rotor spider 10 has a positive pressure near the inner outer peripheral side of the rotor spider 10 due to the fire characteristics of the rotor spider 10. , will flow downward from the air release hole 34 of the lower flange 13. This cold air cools the bracket arm 5 and prevents the temperature of the bracket arm 5 from rising. This air flows between the lower ventilation guide plate 31 and the rotor 1.
The air is circulated through the gap 33 between the stator air chamber 27, the cooler 26, and the stator air chamber 27. Since the temperature of the bracket arm 5 does not rise in this way, vibrations caused by misalignment of the bearing part 3 or misalignment of the attachment part between the bracket arm 5 and the wall 9 are eliminated, which improves reliability. It becomes a high-speed rotating electric machine.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can of course be implemented with various modifications without changing the gist thereof.

〔Effect of the invention〕

As explained above, according to the present invention, the conventional drawback that the bracket arm becomes high temperature is completely eliminated, the adverse effects caused by the high temperature of the bracket arm are prevented, and a highly reliable one-sided ventilation type fully enclosed type We can provide rotating electric machines.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of the right half of a conventional fully enclosed rotary electric machine with ventilation on one side, Fig. 2 is an enlarged view of the main part in the direction of arrow "A" in Fig. 1, and Fig. 3 is a single-ventilation type of the present invention. Right half vertical sectional view showing an example of a fully enclosed rotating electric machine, No. 4
The figure is an enlarged view of the main part in the direction of arrow "B" in FIG. 3. 1... Rotor, 3... Bearing section, 4... Bracket, 5... Bracket arm, 6... Stator, 1
0...Rotor spider, 12...In-flight ventilation path, 1
3...Lower flange, 17...Rotor yoke, 18
... Air duct, 19 ... Magnetic pole, 21 ... Opening, 24 ... Stator core, 25 ... Stator winding,
26...Cooler, 34...Air release hole.

Claims (1)

[Claims] 1. A rotor yoke is provided with a bracket and a bracket arm for supporting a bearing at the lower part of the rotor, and a radial ventilation duct is provided in a rotor yoke provided with magnetic poles.
The rotor yoke is attached to the outer peripheral opening side of a fan-shaped rotor spider, and the rotor spider has its center side opened upward, and the ventilation duct of the rotor yoke and the fan action of the rotor spider cause the ventilation duct to radially through the rotor core and stator windings,
A cooler is used in a one-sided ventilation type fully enclosed salient pole rotating electrical machine in which the air inside the machine that has cooled the stator core through a cooler is circulated to the inside air passage formed along the upper ends of the stator and rotor. The air cooled by the rotor spider is introduced from the opening above the center side of the rotor spider by the fan action of the rotor spider, and is discharged downward from the air release hole provided on the lower side near the outer side of the lower flange of the rotor spider. A fully enclosed salient pole rotating electric machine with one side ventilation, which is characterized by cooling the bracket arm.