JPH07170692A - Rotating electric machine - Google Patents

Abstract

PURPOSE:To surely enhance the cooling efficiency of the rotating electric machine by a method wherein a warped shroud is arranged between blades for a rotor and in the halfway part in the axial direction of the blades. CONSTITUTION:When a shaft 5 is rotated, blades 8 are turned due to its rotation. By their rotation, the open air is sucked into the inside from wind holes 10a, 10b in end brackets 2a, 2b, and it is guided to a rotor 6 by fan guides 9a, 9b. The air which has been guided to the side of the rotor 6 passes between the blades 8 by the centrifugal force of the rotor 6, and it advances in the inside of a stator coil 4 and of the fan guides 9a, 9b. At this time, shrouds 8a are shaped gradually curved so as to face the position toward an end ring 7 from the tip of the blades 8 as the shrouds 8a advance to the outer circumferential side from the inner circumferential side in the radial direction. As a result, an average wind velocity becomes larger than that in conventional cases. That is to say, the cooling efficiency of the rotor 6 and of a stator 3 can be enhanced, and a rotating electric machine can be miniaturized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric machine, and more particularly, it has blade blades axially projecting from both end surfaces of a rotor, and the blade blades take in external air into the interior for cooling. The present invention relates to an open-type rotating electric machine suitable for

[0002]

2. Description of the Related Art As a conventional technology of an open type rotating electric machine, there is a technology shown in FIG. That is, in the figure, the housing 1 is formed into a cylindrical shape with both axial ends open.
The stator 3 is attached to the inside thereof and the shaft 5
Is rotatably supported. The stator 3 is attached to the inner peripheral wall of the housing 1 and has a stator coil 4 wound around both ends in the axial direction. The shaft 5 is
End brackets 2a attached to both ends of the housing 1,
2b is supported via respective bearings (not shown), one end of which is inserted through the end bracket 2b to form an output shaft. The end brackets 2a and 2b close the openings at both ends of the housing 1, and are provided with air holes 10a and 10b for taking the outside air into the housing 1. A rotor 6 is provided at an intermediate position of the shaft 5 in the housing 1 so as to face the stator 3, and the rotor 6 has a secondary conductor bar (not shown), an end ring 7, and a blade blade 8. ing. The blade blade 8 is an end ring 7 of the rotor 6.
Are provided on both end surfaces in a radial manner along the axial direction. Further, the fan guide 9 is provided inside the housing 1.
a and 9b are attached. The fan guides 9a, 9
Reference numeral b is a thin plate formed by hollowing out a central portion through which the shaft 5 passes, and is sandwiched between both end portions of the housing 1 and the end brackets 2a and 2b. I am trying to lead to the 8 side. Such a rotary electric machine has a rotor 6
When the shaft 5 rotates due to the magnetic action formed by the stator 3 and the stator 3, the blade blade 8 also rotates accordingly, and the outside air is sucked into the housing 1 through the air holes 10a and 10b of the end brackets 2a and 2b. And
The sucked air is guided to the blade blade 8 side by both fan guides 9a and 9b as shown by the arrow a in FIG. The blade blades 8 expel the air introduced by the fan guides 9a and 9b as shown by the arrow B. That is,
The blade blades 8 rotate to cool the rotor 6 by passing air through the space defined together with the end rings 7, and then the stator coils 4 and the fan guides 9a and 9b are connected to each other as shown by an arrow B. The stator 3 is cooled by discharging the stator 3 toward the gap. And the stator 3
The air passing through the side is discharged to the outside through discharge holes 1a and 1b provided in the housing 1. As a device related to this type, Japanese Patent Publication No. 56-42223 can be cited.

[0003]

In the prior art described above, the outside air is taken in by using the fan guides 9a and 9b, and fixed to the rotor 6 by using the fan guides and the blade blades 8. Both the child 3 and the child 3 are cooled. However,
When smaller size is required, the efficiency of cooling the heat generating portion has to be increased more than in the prior art, and thus there is a problem in cooling.

An object of the present invention is to provide a rotating electric machine capable of reliably increasing the cooling efficiency in view of the above problems of the prior art.

[0005]

According to the present invention, the outside air is introduced through the air holes of the end bracket, and the introduced outside air is discharged through the exhaust holes of the housing through the blade blades of the rotor and the stator in order. Type rotating electric machine,
Between each blade blade of the rotor, at least one shroud disposed at an intermediate position in the axial direction of the blade blade is mounted, and the shroud introduces the outside air sucked from the air holes of the end bracket to the stator side. It is characterized by having a warped shape so as to lead.

[0006]

In the present invention, as described above, the shroud is mounted between the blade blades to form two space portions in which the blade blades are axially divided by the shroud, and the shroud has the end bracket. Since it has a curved shape to guide the outside air sucked in from the air holes to the stator side, the wind speed gradually increases in one space from the tip side as the back side of the shroud to the end ring side. At the same time, in the other space, the wind speed gradually increases from the tip of the blade blade to the shroud side, and the air flows along the shroud. Therefore, although the maximum wind speed in the space between the blade blades is lower than that in the prior art, the average wind speed in that space is higher than that in the prior art. And the air volume between the blade blades is represented by the average air velocity x ventilation area, so if the ventilation area is constant, the higher the average air velocity, the more the air volume, and therefore it is clear that the air volume is larger than in the prior art. is there. That is, by providing the shroud, the average wind speed passing through each space is increased and the air volume is increased, so that the cooling efficiency of the rotor and the stator can be reliably increased, and the rotating electric machine can be downsized accordingly.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an overall view showing a motor to which an embodiment of a rotating electric machine according to the present invention is applied, FIG. 2 is an enlarged side view for explaining a main part of a rotor, and FIG. 3 shows a wind speed distribution between blade blades in the rotor. It is an explanatory view shown. As shown in FIG. 1, the rotating electric machine of the embodiment includes a housing 1 having a stator 3 on an inner peripheral wall thereof, end brackets 2a and 2b for closing openings at both ends thereof, and bearings provided to these end brackets 2a and 2b. A shaft 5 which is supported and has a rotor 6 at a position facing the stator 3, and an end bracket 2a,
It is configured to include fan guides 9a and 9b that guide the outside air sucked in through the air holes 10a and 10b of 2b to the rotor 6 side. Then, by the rotation of the rotor 6, outside air is sucked into the inside from the air holes 10a and 10b of the end brackets 2a and 2b, and the sucked air is introduced to the rotor 6 side through the fan guides 9a and 9b. The centrifugal force of the rotor 6 cools the blades 8 between the blade blades 8 and the stator 3 side, and then the discharge holes 1a of the housing 1
1b is discharged to the outside. This point is similar to the conventional technique.

In this embodiment, the difference from the prior art is that the shroud 8 is provided between the blade blades 8 of the rotor 6.
The point a is mounted. More specifically, as shown in FIG. 2, the shroud 8a is mounted so as to straddle between the blade blades 8 of the rotor 6 and the blade blades 8 adjacent to the blades 8, and the space between the blade blades 8 is also provided. Figure 3
As shown in FIG. 2, the blade blade is divided into two parts, that is, a single plate body disposed at an intermediate position in the axial direction of the blade blade. And the air holes 1 of the end brackets 2a, 2b
When the outside air sucked from 0a, 10b passes through the blade blades 8 of the rotor 6, the space between the blade blades 8 is axially divided by the shroud 8a to pass through the space A, B. The wind speed of the outside air is increased. The shroud 8a is shown in FIGS.
As shown in FIG. 3, the blade blade 8 has a curved shape in the radial direction from the tip end side of the blade blade 8 to a position near the end ring 7 which is the base side of the blade blade 8 in the radial direction. Then, the outside air passing through the space between the blade blades 8 flows along the shape of the shroud 8a, thereby giving directionality to the stator coil 4 side. Such a shroud 8a can be integrally molded by using a core or the like when molding the rotor 6, the secondary conductor bar (not shown), the end ring 7, and the blade blade 8 by casting, but If the number of steps is not concerned, the thin plate may be finally fixed by welding or the like.

Since the rotary electric machine of the embodiment has the above-mentioned construction, the air circulation action will be described next in relation to its operation. When the shaft 5 is rotated by the magnetic action formed by the stator 3 in the housing 1 and the rotor 6 of the shaft 5, the blade blades 8 are also rotated accordingly, and the rotation causes the outside air to flow as shown in FIG. Of the end brackets 2a, 2b are sucked into the inside from the air holes 10a, 10b, and the sucked air is guided to the rotor 6 side by the fan guides 9a, 9b as shown by the arrow a. The air guided to the rotor 6 side passes between the blade blades 8 by the centrifugal force of the rotor 6 and is directed toward the inner side of the stator coil 4 and both fan guides 9a and 9b as shown by the arrow B. . In the prior art, when the air passes between the blade blades 8, the shroud 8a does not exist, so that the tip side of the blade blades 8 has a weak wind speed in the space C between the blade blades 8 as shown in FIG. , The wind speed gradually increases from that point, and the wind speed distribution becomes a curved line where the end ring 7 side becomes the maximum wind speed Vb, and as a result,
In the space portion C, the average wind speed is the value. On the other hand, in the embodiment, as described above, the shroud 8a forms the two space portions A and B in which the blade blades 8 are axially divided from each other, and the shroud 8a extends radially from the inner peripheral side to the outer peripheral side. As the blade blade 8 is gradually curved toward the position closer to the end ring 7 which is the base of the blade blade 8, the blade blade 8 has a curved shape as shown in FIG.
In the space A, the wind speed gradually increases from the tip side as the back side of the shroud 8a to the end ring 7 side, and also in the space B, the wind speed gradually increases from the tip of the blade blade 8 to the shroud 8a side. In addition, air flows along the shroud 8a as shown by arrows C and D in FIG. Therefore, as compared with the prior art in which the shroud 8a is not used, the wind velocity distributions such as the curves E and F shown in FIG.
The average of the sum of these curves E and F is the average wind speed G. Then, although the maximum wind speed Va in the embodiment is smaller than the maximum wind speed Vb in the conventional technology, the average wind speed G in the above embodiment is higher than the average wind speed Chi in the prior art which does not have the shroud 8a. . Blade 8
The air volume between the two is represented by the average air velocity x the ventilation area. Therefore, if the ventilation area (here, it corresponds to the total axial length of the blade blades) is constant, the higher the average wind speed, the greater the air volume. It is clear that the example has more airflow than the prior art. That is, by providing the shroud 8a, the average wind speed passing through each of the spaces A and B is increased and the air volume is increased, so that the cooling efficiency of the rotor 6 and the stator 3 can be reliably increased, and as a result, the rotating electric machine Can be miniaturized. In the illustrated embodiment, as the shroud 8a disposed between the blade blades 8, one shroud 8a is provided at an intermediate position in the axial direction of the blade blades 8 so that the spaces A and B have substantially the same volume. As shown, a plurality of shrouds are provided depending on the axial length of the blade blades 8, and the plurality of shrouds form a plurality of spaces between the blade blades in the axial direction to increase the average wind speed and further increase the air volume. Can be improved to further improve the cooling efficiency.

[0010]

As described above, according to the present invention, a shroud disposed at an intermediate position in the axial direction is mounted between the blade blades of the rotor, and the space between the blade blades is provided by the shroud. Since the cooling efficiency can be improved by increasing the average wind speed in the section and increasing the amount of air passing through the rotor and the stator, it is possible to reliably reduce the temperature rise of the rotating electric machine. There is an effect that miniaturization can be achieved.

[Brief description of drawings]

FIG. 1 is an overall partially broken view showing a motor to which an embodiment of a rotating electric machine according to the present invention is applied.

FIG. 2 is an enlarged side view for explaining a main part of a rotor.

FIG. 3 is an explanatory view showing a wind speed distribution between blade blades of a rotor.

FIG. 4 is an overall partially broken view showing a conventional rotating electric machine.

FIG. 5 is an explanatory view showing a wind speed distribution between blade blades in a rotor of a conventional technique.

[Explanation of symbols]

1 ... Housing, 1a, 1b ... Discharge hole, 2a, 2b ... End bracket, 10a, 10b ... Wind hole, 3 ... Stator,
5 ... Shaft, 6 ... Rotor, 8 ... Blade blade, 8a ...
Shroud.

Claims (1)

[Claims] 1. An open-type rotating electric machine in which outside air is introduced from the air holes of the end bracket, and the introduced outside air is discharged from the discharge holes of the housing through the blade blades of the rotor and the stator sequentially. Between each of the blade blades, at least one shroud disposed at an intermediate position in the axial direction of the blade blade is mounted, and the shroud guides the outside air sucked from the air holes of the end bracket to the stator side. A rotating electric machine characterized by having a curved shape.