JP2001078391A - Dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling performance at the end part of a stator coil winding, and to reduce heat loss. SOLUTION: In an outer shell 21, that is composed of a stator frame 22 and bearing brackets 23 and 24, a rotor 37 that has a stator 27 and a rotary shaft 36 is provided, and at the same time, partition members 45 and 46 that separate the upstream side from the downstream one in axial flow fans 43 and 44 which are mounted to the rotary shaft 36 for fixing are provided, and an inner circumference side coil winding end part projects inside nearly into an arc shape at the end of stator coil winding covered with the partition members 45 and 46, while being located on the downstream side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rotating electric machine in which a stator and a rotor are cooled by a built-in axial fan.

[0002]

2. Description of the Related Art Heretofore, a structure of a drip-proof type electric motor as a rotating electric machine of this type will be described with reference to a longitudinal sectional view of an upper half shown in FIG. 9 and an enlarged view of a main part of FIG. The outer shell 1 of the electric motor is composed of a cylindrical stator frame 2 and bearing brackets 3a, 3b attached to and fixed to both left and right end faces as shown in the figure, and is provided at the center of the bearing brackets 3a, 3b. Has bearings 4a and 4b, respectively. A stator 5 is provided on the inner peripheral surface at a substantially central portion of the stator frame 2.
Is attached and fixed. That is, an outlet 2a of a refrigerant having a slit-like opening extending in the axial direction, for example, is formed substantially at the center of the stator frame 2, and a stator core 5 serving as a stator 5 is formed on an inner peripheral surface in the area of the outlet 2a. The outer diameter portion 6 is fitted and fixed. And this stator core 6
Is composed of a plurality of iron core blocks 6a, a stator winding 7 is accommodated in a slot (not shown) formed inward, and a first ventilation duct 8 in the radial direction is formed between each iron core block 6a. Have been. In addition, the outer shell 1
The coolant inlet 2b is formed on both sides of the outlet 2a.

On the other hand, a rotor 10 on which a rotating shaft 9 is supported is mounted on the bearings 4a, 4b of the bearing brackets 3a, 3b. The rotor 10 has a plurality of rotors corresponding to the stator core 6. A stator core 11 composed of an iron core block 11a and a rotor conductor 12, and a second radial ventilation duct 13 is formed between each iron core block 11a. The duct 13 has an arrangement corresponding to the first ventilation duct 8. In addition, in each of the iron core blocks 11a, a ventilation hole 14 is formed in the vicinity of the rotation shaft 9 near the center portion so as to penetrate in the axial direction, and communicates with the second ventilation duct 13. It is in.

The rotating shaft 9 is provided with the rotor 1
Axial fans 15 and 16 disposed on both sides of the axial flow fan 0 are fixedly mounted, and the blades 15 blown toward the inner rotor 10 as the axial fans 15 and 16 rotate.
a and 16a, respectively. However, on the upstream side of the axial fans 15 and 16 (on the bearing brackets 3a and 3b side).
The annular partition members 17 and 18 are provided in the outer shell 1 so as to partition between the downstream side (the rotor 10 and the stator 5 side).

That is, the partition members 17 and 18 have outer diameter portions joined between the outlet 2a and the inlet 2b of the stator frame 2 and inner diameter portions of the blades of the axial fans 15 and 16 respectively. Forming an annular shape close to the tip of 15a, 16a,
Further, the inner diameter portion is constituted by cylindrical portions 17a and 18a extending toward the rotor 10 which is the downstream side. The ends of the stator winding 7 are arranged on the outer peripheral side of the cylindrical portions 17a and 18a, and as a result, the ends of the winding 7 are covered by the partition members 17 and 18. . Therefore, the upstream-side refrigerant taken in from the inlet 2b by the rotation of the axial fans 15 and 16 flows smoothly without being mixed by the partition members 17 and 18 while flowing out from the outlet 2b on the downstream side.

A wind tunnel 19 is provided on the upper surface of the outer shell 1 of the electric motor having the above configuration so as to cover the refrigerant inlet 2b and the outlet 2a. This wind tunnel 19
Are intake ports 19 communicating with the respective inlets 2b at both axial end faces.
b are formed, and an exhaust port 19a is formed substantially at the center. The exhaust port 19a is separated from the intake port 19b by partition walls 20a, 20b, while the outlet port is formed. 2a.

[0007]

In the electric motor constructed as described above, the axial fan 1 is driven by the rotation of the rotating shaft 9.
When 5, 16 are rotated, as shown by arrows in FIG.
Outside air refrigerant is sucked from the inlet 19a, and the inlet 2b
Flows into the outer shell 1 of the motor. Hereinafter, for convenience of explanation, the flow of the refrigerant on the left side in the figure will be described (the same operation is also performed on the right side in the figure), and the refrigerant flows upstream and downstream with respect to the partition member 17 and the axial fan 15. On the upstream side, heat is radiated into the refrigerant by contacting one of the bearings 4a, and on the downstream side, heat is similarly radiated around the outer end surfaces of the rotor 10 and the stator 5 to cool them.

After that, a part of the refrigerant used for cooling is discharged to the outside from the exhaust port 19a of the wind tunnel 19 through the outlet 2a, and a part of the refrigerant flows into the ventilation hole 14 of the rotor 10,
The refrigerant flows in the centrifugal direction together with the refrigerant flowing from the opposite side, and is discharged to the outer peripheral direction through the second ventilation duct 13. The refrigerant is sucked from the axial ventilation holes 14 by the centrifugal pump action (fan effect) accompanying the rotation of the rotor core 11, and is centrifugally discharged outward from the second ventilation duct 13 communicating with the refrigerant. Accordingly, each iron core 6, 11 is also cooled from the inside.

Accordingly, this type of motor has iron loss in the stator core 6 and the rotor core 11, copper loss in the stator winding 7 and the rotor conductor 12, and bearings 4a and 4b.
In order to reduce the heat loss such as the friction loss of the bearing, it is desirable to increase the contact of the coolant with these heat generating members to enhance the cooling effect. However, enlarging the axial fan 15 or enlarging the space inside the outer shell 1 in order to increase the cooling effect is not preferable, such as increasing the cost, and is disadvantageous for practical use. Thus, in the above-described cooling structure, the coolant taken in from the inflow port 2b through the air inlet 19b of the wind tunnel 19 cools the partition member 17 inside the outer shell 1 in order to efficiently cool the heating member. The upstream and downstream regions are provided so as not to mix with each other, and the end portion of the stator winding 7 that projects most outward in the axial direction is covered with the partition member 17. Thus, the ventilation passage for effectively contacting the refrigerant with all the heat generating members in the outer shell 1 is compactly configured.

However, in the ventilation passage of the refrigerant in the outer shell 1, ventilation loss such as entrance loss, bending loss and exhaust loss is unavoidable. In addition, in the above-described conventional configuration, as shown in FIG. The cooling at the end of the stator winding 7 tends to be insufficient. That is, the refrigerant flows relatively quickly as a main ventilation path near the stator core 6 as shown by the solid line arrow in the figure, and naturally has a good cooling effect. As a result, the ventilation in the direction of the arrow indicated by the dashed line is not performed sufficiently, and a so-called stagnation region S is generated as shown by the two-dot chain line in the figure, and the replacement of the refrigerant is insufficient and the cooling effect is reduced . However, in this type of electric motor, the capacity (size) is determined in consideration of the heat loss in the largest temperature rising portion. Therefore, when the ventilation loss and the heat loss are large, the intended cooling performance is eventually secured. Has a problem that the size of the motor is increased.

Accordingly, it is an object of the present invention to provide a rotating electric machine capable of improving cooling performance at an end portion of a stator winding and reducing heat loss.

[0012]

In order to achieve the above object, a rotating electric machine according to the present invention comprises, firstly, a cylindrical stator frame and bearing brackets provided at both ends thereof and having bearings. An outer shell, a stator fixed to the inner peripheral surface of the stator frame, a rotor corresponding to the stator, and mounted between the two bearing brackets via a rotary shaft, An axial flow fan attached to and fixed to the rotating shaft at the side of the refrigerant flow inlet formed at the outer shell and located at an upstream side of the axial flow fan and an outlet positioned at a downstream side, A cylindrical portion provided in an outer shell and adjacent to a radial end portion of the axial fan so as to partition between an upstream side and a downstream side of the axial fan, and the fixed portion located in a downstream region; A partition member formed so as to cover an end of the slave winding, and And wherein the protruding formed in a substantially arcuate shape to among the peripheral winding end portions of the line inwardly (the invention of claim 1).

According to such a configuration, the end of the inner circumferential side winding is formed to protrude in a substantially arc shape inward, so that the collision angle of the refrigerant colliding with the end of the winding is increased so that the flow direction is changed. Can be directed to the tip end side of the winding end, which is the partition member side. Therefore, most of the refrigerant that has collided in the main flow direction of the refrigerant can be guided to the end of the stator winding, and the end of the stator winding that has been insufficient due to the formation of a stagnation region in the past is obtained. The cooling effect can be improved by smoothing the flow of the refrigerant in the above, the cooling efficiency can be obtained by suppressing the ventilation loss of the refrigerant as a whole, and the heat loss generated by copper loss and iron loss etc. It is possible to provide a rotating electric machine which can be reduced more and is suitable for practical use such as obtaining a compact motor size.

[0014] In order to achieve the above object, the rotating electric machine of the present invention comprises, secondly, an outer shell comprising a cylindrical stator frame and bearing brackets provided at both ends thereof and having bearings. A stator attached and fixed to the inner peripheral surface of the stator frame, a rotor corresponding to the stator and mounted between the bearing brackets via a rotating shaft, and a side of the rotor. An axial fan mounted and fixed to the rotating shaft; an inlet formed on the outer shell and located at an upstream side of the axial flow fan and an outlet located at a downstream side of the axial fan; A cylindrical portion is provided adjacent to a radial end of the axial fan so as to partition between an upstream side and a downstream side of the axial fan, and the stator winding located in a downstream region is provided. A partition member formed so as to cover the end, and an end of the stator winding. Protruding formed in a substantially arc shape outwardly out outer circumferential side coil end portion and wherein (invention of claim 2).

According to such a configuration, by forming the outer-circumference-side winding end portion to protrude outward in a substantially arc shape, the distance between the outer-circumference-side winding end portion and the inner-circumference-side winding end can be increased. Therefore, the flow velocity of the refrigerant flowing into the wide space region passing between the inner winding ends in the parallel state is reduced until reaching the outer winding end, and between the outer winding ends. At the time of inflow and outflow, the so-called entrance loss, particularly due to the reduction of the inflow resistance at the entrance, can be minimized, so that a sufficient ventilation volume (refrigerant) can be secured and the cooling performance of the winding end can be enhanced.

In order to achieve the above object, a rotating electric machine according to the present invention has, in a third aspect, an outer shell comprising a cylindrical stator frame and bearing brackets provided at both ends thereof and having bearings. A stator attached and fixed to the inner peripheral surface of the stator frame, a rotor corresponding to the stator and mounted between the bearing brackets via a rotating shaft, and a side of the rotor. An axial fan mounted and fixed to the rotating shaft; an inlet formed on the outer shell and located at an upstream side of the axial flow fan and an outlet located at a downstream side of the axial fan; A cylindrical portion is provided adjacent to a radial end of the axial fan so as to partition between an upstream side and a downstream side of the axial fan, and the stator winding located in a downstream region is provided. A partition member formed so as to cover an end portion, and a cylindrical shape of the partition member. The downstream extending end, characterized in that a guide member for directing the air by the axial flow fan to the end tip side of the stator winding (the invention of claim 3).

According to such a configuration, the refrigerant taken in by the axial fan is partially taken in by the guide member while being supplied to the stator core or the like on the downstream side, and the wind direction is changed. , Are sequentially supplied toward the end of the stator winding end covered by the partition member.Therefore, there is no blind spot in the flow of the refrigerant as in the related art, and a stagnation region does not occur. It is possible to provide a rotating electric machine capable of reducing temperature and reducing heat loss.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment in which a rotating electric machine according to the present invention is applied to a drip-proof motor will be described below with reference to FIGS. First, FIG. 1 is a longitudinal sectional view showing the configuration of an upper half portion of a motor, omitting a lower half portion thereof. As shown in the drawing, an outer shell 21 of this type of drip-proof motor has a cylindrical stator frame. 22 and bearing brackets 23 and 24 attached to and fixed to the left and right end surfaces thereof, and bearings 25 and 26 are provided at the center of the bearing brackets 23 and 24, respectively. A stator 27 is mounted and fixed substantially at the center of the inner peripheral surface of the stator frame 22. That is, the stator frame 22
At the center of the inner peripheral surface, there is formed a refrigerant outlet 28 composed of a plurality of slit-shaped openings extending in, for example, the axial direction (the left-right direction in the drawing), and an inner peripheral surface in a region where the outlet 28 is formed. Further, the outer diameter portion of the stator core 29 of the stator 27 is attached and fixed by fitting.

The stator core 29 is composed of a plurality of divided core blocks 29a, and a stator winding 30 is inserted into a slot (not shown) formed inside and held by a wedge (not shown). Thus, the stator 27 is configured. However, between the iron core blocks 29a, plate-shaped first spacers 31 extending in the radial direction and intermittently arranged in the circumferential direction are alternately interposed in the axial direction, and are pressed by the clamps 32 to be integrated. Thus, a first ventilation duct 33 in a so-called radial direction is formed, which extends from the inner diameter side to the outer diameter side of the core block 29a. Further, refrigerant inlets 34 and 35 are formed on both sides of the outlet 28 of the outer shell 21, respectively.

On the other hand, the bearings 25 and 26 of the bearing brackets 23 and 24 have a rotor 37 on which a rotating shaft 36 is supported.
Are provided in a positional relationship corresponding to the stator 27. The rotor 37 includes a rotor core 38 and a rotor conductor 3.
The rotor core 38 is composed of a plurality of core blocks 38a divided in the axial direction, and between the core blocks 38a, the rotor conductors 39 correspond to the number of slots (not shown). The cylindrical second spacers 40 formed integrally with each other and arranged intermittently in the circumferential direction are provided alternately in the axial direction. Therefore, a second ventilation duct 41 in the radial direction is formed between the iron core blocks 38a, and the outer peripheral side of the second ventilation duct 41 passes through the air gap G to the first ventilation duct 41.
Is opposed to the ventilation duct 33. Further, a plurality of ventilation holes 42 (only one is shown) formed in the vicinity of the rotation shaft 36 on the center side and penetrating through each iron core block 38a in the axial direction are formed. The inner end side of the second ventilation duct 41 communicates in a direction perpendicular to the above.

Axial fans 43, 44 arranged on both sides of the rotor 37 are fixedly mounted on the rotating shaft 36, and are inwardly provided as the axial fans 43, 44 rotate. Blade 43 blown toward rotor 10 side
a and 44a, respectively. However, the bearing brackets 23 and 2 on the upstream side of the axial fans 43 and 44
The area on the fourth side and the rotor 37 and the stator 27 on the downstream side
Annular partition members 45 and 46 to separate the
Are mounted in the outer shell 21 by screwing means or the like. That is, the partition members 45 and 46 have outer diameter portions joined between the inlets 34 and 35 of the stator frame 22 and the outlet 28, respectively, and inner diameter portions thereof have the respective axial fans 43 and 46.
Forty-four blades 43a, 44a are formed in an annular shape close to the tips of the blades, and the inner diameter portion is formed of cylindrical portions 45a, 46a extending toward the rotor 37, which is the downstream side.

The ends of the stator winding 30 are arranged on the outer peripheral side of the tubular portions 45a and 46a. As a result, the ends of the winding 30 are covered by the partition members 45 and 46. , Disposed in the downstream region of the axial fans 43, 44. Therefore, while the upstream-side refrigerant taken in from the inlets 34 and 35 by the rotation of the axial fans 43 and 44 flows out from the downstream-side outlet 28, the partition member 4
5, 46 to be segregated to flow without mixing. And especially in this structure, the partition members 45 and 46
Of the end portions of the stator winding 30 arranged so as to be covered by the inner winding end portion 30a as shown in an enlarged manner in FIG.
Is formed in a substantially circular arc shape projecting radially inward, while the outer peripheral side winding end portion 30b opposed thereto is formed substantially linearly in the present configuration.

On the upper surface of the outer shell 21 of the electric motor constructed as described above, a wind tunnel 47 is provided so as to cover the inlets 34, 35 and the outlet 28 of the stator frame 22. . The wind tunnel 47 has intake ports 48 and 49 on both end faces in the axial direction.
And an exhaust port 50 is formed substantially at the center, and partition walls 47a and 47b are integrally formed between each of the intake ports 48 and 49 and the exhaust port 50 to isolate them. Accordingly, each of the intake ports 48 and 49 is connected to the stator frame 2 respectively.
The exhaust port 50 communicates with the outlet 28 and the exhaust port 50 communicates with the inlets 34 and 35.

Next, the operation of the above configuration will be described. When the axial fans 43 and 44 attached and fixed to the rotating shaft 36 are rotated with the energization driving of the electric motor, as shown by arrows in FIG. 1, the refrigerant flowing outside through the two intake ports 48 and 49 of the wind tunnel 47. Is sucked, and the outer shell 21 of the motor is
Flows into. Hereinafter, for convenience of explanation, the flow of the refrigerant based on the operation of the axial fan 43 on one side on the left side in the figure will be described. It should be noted that the right side in the figure also exerts substantially the same operation with respect to the symmetrical structure, and will be described below as necessary.

Therefore, the refrigerant introduced into the outer shell 21 promotes a heat radiation action from the bearing 25 in the upstream area defined by the partition member 45 and the axial fan 43, thereby cooling the same. Effectively reduce friction loss. Thereafter, the refrigerant reaches the downstream region after the axial fan 43,
It contacts heat generating members such as the stator winding 30 end of the stator 27, the stator core 29, and the rotor core 38 and the rotor conductor 39 of the rotor 37, and radiates heat into the refrigerant to cool. The refrigerant which has been subjected to the cooling and raised in temperature in this manner is supplied to the stator frame 2
The air is discharged from the exhaust port 50 of the wind tunnel 47 to the outside through the second outlet 28.

However, the cooling operation of the refrigerant on the downstream side will be described in more detail. First, the refrigerant contacts the outer surfaces of the rotor conductor 39 and the rotor core 38 to cool the rotor 37 while cooling. After a part flows in from the ventilation hole 42 of the rotor core 38, it flows to the outer peripheral side through the second ventilation duct 41, and also cools each core block 38a from the inner side. In this case, the inflow of the refrigerant into the ventilation holes 42 and the second ventilation duct 41 in the rotor 37
It is taken in based on the centrifugal pump function (fan action) accompanying the rotation of 7 and is discharged outward, flows in from both the left and right directions of the ventilation hole 42, and is discharged together in the centrifugal direction.

On the side of the stator 27, while cooling the ends of the stator windings 30 and the outer surface of the stator core 29, the refrigerant that has passed through the second ventilation duct 41 is supplied between the core blocks 29a. Flows into the first ventilation duct 33, and flows out of the outlet 28 through the outer peripheral side, thereby cooling the stator core 29 also from the inside. In this case, in particular, the flow of the refrigerant at the end of the stator winding 30 is in the vicinity of the inner winding end 30a and the outer winding end 30b including the tip covered by the partition member 45. A part of the flow of the refrigerant flows through a linear ventilation path between the axial fan 43 and the outlet 28, and in particular, in this configuration, the inner peripheral side winding end 30a protrudes inward in a substantially arc shape. As a result, the refrigerant that has collided with the end portion 30a is redirected toward the partition member 45, and therefore easily flows in the direction indicated by the dashed arrow in FIG.

This will be described with reference to the operation explanatory view at the end of the stator winding 30 shown in FIG. 3. First, when this is applied to the end of the conventional stator winding 7 described above, Since it is formed in a substantially straight line as shown by the dashed line, the collision angle θ0 formed by the arrow X indicating the main flow direction of the refrigerant with respect to the end of the winding 7 is an acute angle. It flows toward the stator core 6 and the rotor core 11 indicated by the two-dot chain line arrows, and an effective cooling effect at the end of the winding 7 cannot be expected. On the other hand, in the present embodiment, since the inner peripheral side winding end portion 30a has an arc shape, the refrigerant collision angle θ1
Is large and the refrigerant after the collision is a partition member 45 indicated by a broken-line arrow.
Flows to the side.

As a result, a stagnation region S (FIG.
0), the refrigerant flows into the inner peripheral winding end 30a.
Then, the flow is smoothly switched to the outer circumferential side winding end 30b side, and thus the end of the stator winding 29 where the flow of the refrigerant has been insufficient by the partition member 45 until now is effectively cooled. The air is quickly discharged from the outlet 28 and the exhaust port 50 of the wind tunnel 47. As described above, according to the present configuration, particularly, the flow of the refrigerant at the end portion of the stator winding 30 is made favorable, so that the ventilation loss of the refrigerant is suppressed as a whole, and efficient cooling performance is obtained. The heat loss caused by the accompanying copper loss and iron loss can be further reduced, and the motor can be practically used with a compact motor size.

FIGS. 4 to 8 show the second and third embodiments of the present invention, in which the same parts as those in the first embodiment are denoted by the same reference numerals, and their description is omitted. The parts are described below. In addition, the disclosure by these examples is as follows.
Similar to the first embodiment, the structure and operation and effect on the left side will be described.

(Second Embodiment) FIGS. 4 and 5 show a second embodiment of the present invention. First, FIG. 4 is a diagram corresponding to FIG.
An end of the stator winding 30 is different from that of the first embodiment. That is, of the ends, the outer peripheral side winding end 30b is formed in a substantially circular arc shape protruding outward.
The other configuration is the same as that of the first embodiment, such as the inner peripheral side winding end portion 30a having a shape extending substantially linearly.

According to such a configuration, since the distance H1 between the inner and outer winding ends 30a, 30b is increased, the air flows in from between the inner winding ends 30a arranged in the circumferential direction. The ventilation loss of the refrigerant can be reduced, and the ventilation amount required for cooling can be secured. That is, FIG. 5A is a cross-sectional view cut along the line AA in FIG. 4, and the refrigerant that has passed through the axial fan 43 is connected to each inner circumferential winding end as indicated by the arrow direction in the drawing. Part 30
a is supplied from the oblique direction, and flows into the gap W1 between the winding ends 30a. The distance H1 between the inner and outer peripheral winding ends 30a, 30b in the parallel state
In this case, the flow velocity of the inflowing refrigerant is reduced because it is a wide space area having an interval H1 as compared with the gap W1, and then the gap W2 (≒ W1) between the outer winding ends 30b. Flows into.

In this case, since the refrigerant flows into the gap W2 from the decelerated state, it is easy to flow without receiving a large inflow resistance, so that the so-called entrance loss can be reduced as much as possible. It is possible to secure a ventilation amount as an effective refrigerant, and to obtain contact with more refrigerant. And, it passes smoothly between the outer peripheral side winding ends 30b, and thus, the inner and outer peripheral side winding ends 30a, 30
From b, heat is radiated into the refrigerant traversing this and cooled. The refrigerant that has been subjected to this cooling and raised in temperature is discharged outward from the outlet 28 and the exhaust port 50 of the wind tunnel 47 as an exhaust stream.

On the other hand, FIG. 5B is a view corresponding to FIG. 5A corresponding to the above-mentioned conventional configuration, and in this configuration, both the inner and outer peripheral winding ends 7a and 7b are linear. Therefore, the interval H0 formed between them is small (H0 <H1). Thus, the refrigerant flows into the inner peripheral side winding end 7a.
Since the space region that has flowed in from the gap W1 is a space formed with a narrow interval H0, the space W2 tries to flow into the gap W2 (≒ W1) between the outer peripheral winding ends 7b at a flow rate substantially equal to the flow rate. Entrance loss due to the inflow resistance generated at the time of collision with the peripheral edge is large, and as a result, the ventilation volume (refrigerant)
It is unavoidable that the cooling performance over the entire end of the stator winding 7 is reduced. As described above, in the present embodiment, compared with the conventional configuration, the ventilation resistance is reduced by increasing the interval H1, so that a larger amount of the refrigerant flowing through the end of the stator winding 30 can be supplied. Cooling performance can be improved.

It should be noted that, in the above-described first embodiment, in particular, the inner circumferential side winding end 30a is formed in an arc shape, and the flow of the refrigerant colliding with the inner winding end 30a is divided by the partition member 45. It was described that the cooling performance was improved by guiding to the end tip side which is the side. Even in the first embodiment, since it has the same circumstance that a wide space area corresponding to the so-called interval H1 can be formed as in the second embodiment, even the refrigerant flowing from the inner winding end 30a can be used. It can be understood that the same operation and effect as those of the second embodiment can be expected, which is advantageous for further improving the cooling performance.

(Third Embodiment) FIG. 6 to FIG.
FIG. 6 is a view corresponding to FIG. 2, FIG. 7 is an enlarged view of a main part of FIG. 6, and FIG.
It is the front view seen from the stator iron core 29 side (only one left side is shown in the figure). The partition member 51 in the present embodiment includes:
At the extending end of the cylindrical portion 51a, the axial fan 43
Is provided with a guide member 52 which is capable of changing the wind direction so that a part of the refrigerant on the downstream side flows toward the tip of the end of the stator winding 30.

That is, as shown in the cross-sectional views of FIGS. 6 and 7, the guide member 52 is formed integrally with, for example, a tip end of a cylindrical portion 51a extending in the axial direction, and is formed with an inclined surface portion 52a expanding outward. , Further extended and bent to form a stator winding 30
It is composed of a guide surface portion 52b directed toward the distal end of the end portion, and a slit-shaped arc-shaped opening portion 52c (see also FIG. 8) formed at the inclined surface portion 52a at, for example, four circumferential positions. Therefore, the partition member 51 of this configuration is different from the partition member 45 of the first embodiment in that the partition member 51 has the guide member 52, and the remaining configuration is the same as that of the first embodiment.

According to the present embodiment in which the guide member 52 is provided, a part of the refrigerant taken in by the axial fan 43 is supplied to the stator core 29 and the like on the downstream side. The direction of the wind is changed from the opening 52c of the inclined surface 52a, and the wind direction is changed by the guide surface 52b, and the end of the stator winding 30 is covered by the partition member 51 as shown by the dashed arrow in FIGS. It is supplied sequentially toward the tip portion, and the stagnation region S (see FIG. 10) does not occur due to the blind spot of the flow of the refrigerant unlike the related art. As a result, the temperature of the stator winding 30 can be reduced and the heat loss can be reduced. It is possible to provide an electric motor capable of reducing power consumption. The guide member 52 in this embodiment has a configuration in which the opening 52c is formed in the inclined surface 52a. However, the present invention is not limited to this. For example, the inclined surface 52a is formed by extending the cylindrical portion 51a of the partition member 51 in a straight shape. It is possible to take in the refrigerant also as a configuration, and it is also possible to incorporate the refrigerant as a separate member from the partition member 51, and in such a case, even in the guide surface portion 52b, it is possible to change the wind direction into various specific shapes. It can be changed and implemented.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings. For example, the present invention is not limited to the configuration of a motor having two inlets and one outlet for introducing and removing a refrigerant. It can be diverted to a motor having one inflow port, and in such a case, it is also possible to use a single axial flow fan. In addition, the present invention can be applied to various kinds of rotating electric machines without being limited to the drip-proof type electric motor, and can be appropriately modified and implemented without departing from the gist of the invention.

[0040]

As is apparent from the above description, according to the rotating electric machine of the present invention, the flow of the refrigerant is smoothed by suppressing the ventilation loss in the downstream region of the refrigerant, particularly with respect to the end of the stator winding. As a result, it is possible to secure a sufficient amount of ventilation, improve the contact with the refrigerant, and improve the cooling performance. Accordingly, an efficient cooling effect can be obtained without increasing the size of the cooling fan or the rotating electric machine itself, and a practically excellent rotating electric machine capable of suppressing heat loss such as iron loss and copper loss can be provided. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of an upper half of a drip-proof electric motor according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part.

FIG. 3 is an explanatory diagram of an operation at an end portion of a stator winding.

FIG. 4 is a view corresponding to FIG. 2, showing a second embodiment of the present invention;

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a view corresponding to FIG. 2, showing a third embodiment of the present invention;

FIG. 7 is an enlarged view of a main part of FIG. 6;

FIG. 8 is a front view of a partition member.

FIG. 9 is a diagram corresponding to FIG. 1 showing a conventional example.

FIG. 10 is a diagram corresponding to FIG. 2;

[Explanation of symbols]

In the drawings, 21 is an outer shell, 22 is a stator frame, 23 and 24 are bearing brackets, 25 and 26 are bearings, 27 is a stator, 29
Is a stator core, 30 is a stator winding, 30a is an inner winding end, 30b is an outer winding end, 34 is an inlet, 35 is an outlet, 36 is a rotating shaft, and 37 is a rotor. , 38 are rotor cores, 39 is a rotor conductor, 43 and 44 are axial fans,
5, 46 and 51 are partition members, 47 is a wind tunnel, and 52 is a guide member.

Continued on the front page F term (reference) 5H603 AA12 AA15 BB01 BB12 CA01 CA04 CB03 CC07 CC17 5H605 AA01 AA02 BB05 CC01 CC02 CC04 CC05 CC09 DD07 DD11 DD17 DD31 EA05 EA06 EA15 EB01 GG04 GG06 5H609 BB18 PP02 Q05 PP06 RR02 RR17 RR27 RR33 RR35 RR38 RR40 RR43 RR69 RR73

Claims (3)

[Claims] An outer shell comprising a cylindrical stator frame and bearing brackets provided at both ends thereof and having bearings;
A stator mounted and fixed to the inner peripheral surface of the stator frame, a rotor corresponding to the stator and mounted between the bearing brackets via a rotating shaft, and a side of the rotor. An axial fan mounted and fixed to the rotating shaft, an inlet formed on the outer shell and located at an upstream side of the axial flow fan and an outlet located at a downstream side of the axial fan, and provided in the outer shell. An end portion of the stator winding, which has a cylindrical portion adjacent to a radial end portion of the axial flow fan so as to partition between an upstream side and a downstream side of the axial flow fan, and is located in a downstream region. And a partition member formed so as to cover the inner periphery of the stator winding, wherein an end of the inner peripheral side winding of the end of the stator winding is formed to protrude inward in a substantially arc shape. 2. An outer shell comprising a cylindrical stator frame and bearing brackets provided at both ends thereof and having bearings.
A stator mounted and fixed to the inner peripheral surface of the stator frame, a rotor corresponding to the stator and mounted between the bearing brackets via a rotating shaft, and a side of the rotor. An axial fan mounted and fixed to the rotating shaft, an inlet formed on the outer shell and located at an upstream side of the axial flow fan and an outlet located at a downstream side of the axial fan, and provided in the outer shell. An end portion of the stator winding, which has a cylindrical portion adjacent to a radial end portion of the axial flow fan so as to partition between an upstream side and a downstream side of the axial flow fan, and is located in a downstream region. And a partition member formed so as to cover the outer periphery of the stator winding, wherein an outer circumferential end of the stator winding is formed so as to protrude outward in a substantially arc shape. 3. An outer shell comprising a cylindrical stator frame and bearing brackets provided at both ends thereof and having bearings.
A stator mounted and fixed to the inner peripheral surface of the stator frame, a rotor corresponding to the stator and mounted between the bearing brackets via a rotating shaft, and a side of the rotor. An axial fan mounted and fixed to the rotating shaft, an inlet formed on the outer shell and located at an upstream side of the axial flow fan and an outlet located at a downstream side of the axial fan, and provided in the outer shell. An end portion of the stator winding, which has a cylindrical portion adjacent to a radial end portion of the axial flow fan so as to partition between an upstream side and a downstream side of the axial flow fan, and is located in a downstream region. And a guide member for directing ventilation by the axial flow fan toward the distal end of the stator winding at the downstream extending end of the tubular portion of the partition. A rotating electric machine comprising a member.