JP2000245110A - Rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively suppress mainly the temperature increase in stator windings. SOLUTION: After inside air flows out from a centrifugal fan 34 through its rotation, by fitting the centrifugal fan 34 to the part of a shaft located in a machine, and opposing the outside surface of a circuit side board 37 which this centrifugal fan 34 has for blade strips 36 in common with the inside surfaces of the end portions 23a of stator windings 23, the inside air flows along the internal surface of a stator frame 24, and flows in the peripheral-side vicinities of the end portions 23a of the stator windings 23. After that, the air flows between the inside surface of the stator winding end portions 23a and the outside surface of the side board 37 of the fan 34 from the tips of the end parts 23a of the stator windings. Then, the air is inhaled inside the side board 37 and moves towards the blade strips 36. By such an inside air flow as this, heat transmission from the end parts 23a of the stator windings to the inside air, and from the inside air to the stator frame 24 becomes active, and heat transmission from the end portions 23a of the stator windings 23 to the stator frame 24 is performed effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fully-closed rotary electric machine having an improved cooling structure.

[0002]

2. Description of the Related Art Conventionally, as a fully-closed rotary electric machine, there has been a fully-closed outer fan-type induction motor shown in FIG. In this embodiment, a stator 1 is configured by storing a stator winding 3 in a stator core 2, and the stator 1 is surrounded by a stator frame 4. The stator frame 4 is provided with a number of cooling fins 5 on the outer surface.

[0003] A rotor 6 is provided inside the stator 1. The rotor 6 accommodates a rotor conductor 8 in a rotor core 7 and an end ring 9 for short-circuiting the rotor conductor 8. An end ring fin 10 is provided. Further, the rotor 6 has a rotating shaft 11 at the center of the rotor core 7, and the rotating shaft 11 is interposed between bearings 13 by bearing brackets 12 connected to both ends of the stator frame 4. Is supported. Each of the bearing brackets 12 is provided with a number of cooling fins 14 on the outer surface. A cooling fan 15 is attached to the rotating shaft 11 at one end located outside the machine. The cooling fan 15 is covered by a fan cover 16.

With this configuration, during operation of the motor, iron loss occurs in the stator core 2 and the rotor core 7, and copper loss occurs in the stator winding 3 and the rotor conductor 8. Then, a friction loss occurs, and a wind loss occurs on each surface of the rotor 6 and the cooling fan 15, and they become heat.

[0005] On the other hand, the outside air is rotated by the rotation of the cooling fan 15 as shown by a solid line arrow.
The air is sucked into the fan cover 16 from the intake port 16a, and flows between the cooling fins 5 along the outer surface of the stator frame 4 from inside the fan cover 16. On the other hand, the inside air collides with the end 3a of the stator winding 3 and flows in the axial direction due to the fan action caused by the end ring fins 10 as indicated by the dashed arrow, and the inside surface of the bearing bracket 12 and the rotating shaft 11 are rotated. And flows back to the end ring fin 10.

Most of the heat generated by the losses generated in the stator core 2 and the stator winding 3 and in the rotor core 7 and the rotor conductor 8 is transmitted to the stator frame 4, and 4 and the cooling fins 5 are radiated to the outside air. Further, the end 3a of the stator winding 3 and the rotor conductor 8
A part of the heat generated by the end ring fins 10 is transmitted to the bearing bracket 12 by the flow of the inside air caused by the fan action generated by the end ring fins 10 and is radiated from the bearing bracket 12 to the outside air.

[0007]

In the case of the above-mentioned conventional motor, the loss generated in the stator 1, especially the stator winding 3, is larger than the loss generated in other parts, and therefore, the heat flux there is small. As a result, the temperature of the stator winding 3 tends to increase.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and therefore has as its primary object to provide a rotating electric machine capable of effectively suppressing a rise in the temperature of a stator winding.

[0009]

To achieve the above object, a rotating electric machine according to the present invention comprises a stator having a stator core and a stator winding; a stator frame surrounding the stator; A fully-closed type including a rotor provided inside a stator and having a rotating shaft, and a bearing bracket supporting the rotating shaft via a bearing, wherein a centrifugal force is applied to a portion of the rotating shaft located in the machine. A diagonal flow fan is mounted, and an outer side surface of an annular side plate which the fan has in common to the blade pieces is opposed to an inner side surface of an end of the stator winding.

According to this structure, the inside air flows out along the inner surface of the stator frame after flowing out of the fan due to the rotation of the centrifugal or diagonal fan, and flows near the outer peripheral side of the end of the stator winding. Then, from the end of the stator winding end, the air flows between the inner surface of the stator winding end and the outer surface of the side plate of the fan, and is sucked into the side plate to move toward the blade piece. . Due to the flow of inside air, heat transfer from the end of the stator winding to the inside air and from the inside air to the stator frame becomes active, and the heat transfer from the end of the stator winding to the stator frame is effective. It will be performed in a regular manner. Thus, the temperature of the stator winding is reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention applied to a fully enclosed fan-shaped induction motor will be described below with reference to FIG. In FIG. 1, reference numeral 21 denotes a stator, and the stator 21 includes a stator core 22 and a stator winding 2.
3 are included. End 23a of stator winding 23
Project outward from both ends of the stator core 22.
The stator 21 is surrounded by the stator frame 24 by being inserted and fixed to the inner peripheral portion of the stator frame 24. The stator frame 24 has a large number of cooling fins 25 on the outer surface.
Is provided.

A rotor 26 is provided inside the stator 21. The rotor 26 accommodates a rotor conductor 28 in a rotor core 27, and the rotor conductor 28 is placed on both sides of the rotor core 27. It is configured to be short-circuited by the end ring 29.
The rotor 26 has a rotating shaft 3 at the center of the rotor core 27.
The rotating shaft 30 is supported via bearings 32 by bearing brackets 31 connected to both ends of the stator frame 24, respectively. In the bearing bracket 31,
A large number of cooling fins 33 are provided on the outer surface, respectively.

[0013] Centrifugal fans 34 are attached to the rotating shaft 30 at portions located on both sides of the stator core 22 and the rotor core 27 in the machine. The centrifugal fan 34 has a large number of blade pieces 3 on a flat circular main plate 35.
6 are attached radially, and an annular side plate 37 is attached to the end of the side opposite to the main plate 35 in common with all of the blade pieces 36. The outer surface of the side plate 37 is fixed to the stator windings. The wire 23 is opposed to the inner side surface of the end 23a.

On the other hand, a cooling fan 38 is attached to one end of the rotating shaft 30 located outside the machine. The cooling fan 38 is also formed of a centrifugal fan, and has a large number of blade pieces 40 radially attached to a flat circular main plate 39. The cooling fan 38 is covered by a fan cover 41. The fan cover 41 has an intake port 41a at the center, and the exhaust side is open and faces the cooling fins 25 on the outer surface of the stator frame 24. .

Next, the operation of the above configuration will be described. As described above, during operation of the motor, iron loss occurs in the stator core 22 and the rotor core 27, and the stator winding 2
Copper loss occurs in the rotor 3 and the rotor conductor 28, friction loss occurs in the bearing 32, and wind loss occurs in each surface of the rotor 26 and the cooling fan 38, which become heat.

On the other hand, as shown by the solid line arrow, the outside air is blown by the fan
Is sucked into the fan cover 41 from the intake port 41 a of the fan frame 41 and flows between the cooling fins 25 along the outer surface of the stator frame 24 from inside the fan cover 41.

On the other hand, in this case, the inside air is
As shown by the dashed arrow, after flowing out of the fan 34, it flows along the inner surface of the stator frame 24, flows near the outer peripheral side of the end 23a of the stator winding 23, and thereafter,
From the tip of the end 23a of the stator winding 23, the stator winding 23
Flows between the inner side surface of the end portion 23a and the outer side surface of the side plate 37 of the centrifugal fan 34, and is sucked into the side plate 37 toward the blade piece 36.

Due to the flow of inside air, the stator winding 2
3 from the end 23a to the inside air and from the inside air to the stator frame 24 become active, and the end 2
The heat transfer from 3a to the stator frame 24 is effectively performed. Thus, a rise in the temperature of the stator winding 23 can be effectively suppressed, and the temperature can be reduced as compared with the conventional one.

Also in this case, the heat generated by the loss generated in the stator core 22 is transmitted to the stator frame 4 by conduction from the stator core 22. Further, heat due to the loss generated in the rotor core 27 and the rotor conductor 28 is also transmitted to the stator frame 4 by the above-described flow and convection of the inside air. The heat transmitted to the stator frame 4 is applied to the end 2 of the stator winding 23 described above.
The heat is transmitted from the outer surface of the stator frame 4 and the outer surface of the cooling fins 5 to the outside air together with the heat transmitted to the stator frame 4 through the flow of the inside air from 3a.

2 to 14 show the second to ninth embodiments of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. ,
Only the different parts will be described.

[Second Embodiment] In the second embodiment shown in FIG. 2, the side plate 51 of the centrifugal fan 34 is
Instead, the outer surface faces the inner surface of the end 23 a of the stator winding 23, and the tip is close to the end ring 29 of the rotor 26.

By doing so, the inner surface of the end 23a of the stator winding 23 and the outer surface of the side plate 51 of the centrifugal fan 34 extend from the tip of the end 23a of the stator winding 23, as indicated by the dashed arrow. After the inside air flowing between the side plate 5 and the side plate 5 flows near the end ring 29 of the rotor 26,
1 and the heat transfer from the end ring 29 to the stator frame 24 through the inside air becomes active, so that the temperature rise of the end ring 29 and the temperature rise of the rotor conductor 28 are also effective. Temperature can be suppressed, and the temperature can be lower than that of the conventional one.

The rotor 26 is not limited to a rotor conductor 28 housed in a rotor core 27 short-circuited by an end ring 29, but may be a rotor provided with a permanent magnet. In the centrifugal fan 34, the tip of the side plate 51 is preferably brought close to the tip of the permanent magnet.

[Third Embodiment] In a third embodiment shown in FIG. 3, the concave and convex portions 61, 6 which interlock with each other on the outer surface of the main plate 35 of the centrifugal fan 34 and the inner surface of the bearing bracket 32.
2 are provided. In this case, each of the concavo-convex portions 61 and 62 is formed by a plurality of projections, and a projection (convex portion) on the other side is positioned between the respective projections (concave portions) to form a maze-shaped seal portion. ing.

By doing so, the centrifugal fan 3
4 does not flow between the outer surface of the main plate 35 and the inner surface of the bearing bracket 32, and the inside air whose temperature has risen by receiving heat from the end 23 a of the stator winding 23 radiates heat to the bearing bracket 31. In addition, since the temperature does not reach the bearing 32, the temperature rise of the bearing 32 can be effectively suppressed, and the temperature can be reduced as compared with the conventional one. Note that the third embodiment may be implemented in combination with the configuration of the second embodiment.

[Fourth Embodiment] In the fourth embodiment shown in FIG. 4, the bearing bracket 3 is provided on the left side in the drawing of the contact portion between the bearing bracket 31 and the stator frame 24.
On the first side and on the right side in the figure, on the stator frame 24 side, annular concave portions 71 and 72 concentric with the rotating shaft 30 are formed, respectively.
The outer peripheral edge of the main plate 35 of the centrifugal fan 34 is brought close to the concave portions 71 and 72 to form a maze-shaped seal portion.

By doing so, as described above,
The inside air flowing out of the centrifugal fan 34 does not flow between the outer surface of the main plate 35 and the inner surface of the bearing bracket 32, and the inside air whose temperature has risen by receiving heat from the end 23 a of the stator winding 23 is transferred to the bearing bracket 31. Since heat is not dissipated and the bearing 32 does not reach, the temperature rise of the bearing 32 can be effectively suppressed,
Its temperature can be lower than the conventional one.

In this case, both the concave portions 71 and 72 may be formed on the bearing bracket 31 side or on the stator frame 24 side. The fourth embodiment may be implemented in combination with at least one of the configurations of the second and third embodiments.

[Fifth Embodiment] The fifth embodiment shown in FIGS.
In the embodiment, a plurality of fins 81 extending in the circumferential direction concentrically with the rotating shaft 30 are provided on the inner surface of the stator frame 24 facing the end 23 a of the stator winding 23.

By doing so, the centrifugal fan 3
4 flows along the inner surface of the stator frame 24, flows between the fins 81, and
6 is circulated as shown by the broken line arrow A in FIG. 6, and at this time, the swirl component of the inside air flowing out of the centrifugal fan 34 with the rotation of the centrifugal fan 34 causes
As shown by a symbol B in FIG.

Thus, the end 23a of the stator winding 23
Since the heat transfer from the received air to the stator frame 24 becomes more active and the temperature rise of the stator windings 23 can be more effectively suppressed, the temperature can be further reduced. Note that the fifth embodiment may be implemented in combination with at least one configuration of the second to fourth embodiments.

[Sixth Embodiment] In the sixth embodiment shown in FIGS. 8 to 10, the inner surface of the stator frame 24 facing the end 23a of the stator winding 23 is provided in parallel with the rotating shaft 30. A plurality of fins 91 extending in the axial direction are provided.

By doing so, the centrifugal fan 3
4 flows along the inner surface of the stator frame 24, flows between the fins 91, and
As shown by a broken arrow C in FIG. 10, due to the swirl component that the inside air flowing out of the centrifugal fan 34 has along with the rotation of the centrifugal fan 34, Because it flows in the circumferential direction, the fin 9
1 and circulates between the fins 91 as shown by the dashed arrow D in FIG.

Thus, the end 23a of the stator winding 23
Since the heat transfer from the received air to the stator frame 24 becomes more active and the temperature rise of the stator windings 23 can be more effectively suppressed, the temperature can be further reduced. The sixth embodiment may be implemented in combination with at least one configuration of the second to fourth embodiments.

[Seventh Embodiment] In a seventh embodiment shown in FIGS. 11 and 12, a pin-shaped fin 10 is provided on an inner side surface of a stator frame 24 facing an end 23a of a stator winding 23.
1 is provided in plurality. By doing so, when the inside air flowing out of the centrifugal fan 34 flows along the inner surface of the stator frame 24, the inside air also flows while contacting the fins 101 as shown by the dashed arrows in FIG.

Thus, the end 23a of the stator winding 23
Since the heat transfer from the received air to the stator frame 24 becomes more active and the temperature rise of the stator windings 23 can be more effectively suppressed, the temperature can be further reduced. The seventh embodiment may be implemented in combination with at least one configuration of the second to fourth embodiments.

Eighth Embodiment In the eighth embodiment shown in FIG. 13, an axial fan 111 is mounted on the portion of the rotary shaft 30 located inside the side plate 37 of the centrifugal fan 34. By doing so, heat generated by the rotor 26 and traveling toward the bearing 32 via the rotating shaft 30 is transmitted from the rotating shaft 30 to the above-described inside air circulated by the centrifugal fan 34 via the axial fan 111. Thus, the heat reaching the bearing 32 is reduced.

As a result, the temperature rise of the bearing 32 can be effectively suppressed, and the temperature can be reduced as compared with the conventional one. In this case, the axial fan 111
Also assists the pressurizing action of the inside air by the centrifugal fan 34, whereby the flow of the inside air can be further increased. Therefore, the temperature rise of the stator windings 23 and the temperature rise of the bearings 32 can be more effectively suppressed. can do. In addition,
In this case, the axial fan 111 may be replaced with a diagonal fan. Further, the eighth embodiment may be implemented in combination with at least one configuration of the second to seventh embodiments.

Ninth Embodiment In the ninth embodiment shown in FIG. 14, the outer diameter of the main plate 121 of the centrifugal fan 34 is determined to be smaller than that of the main plate 35 described above. The main plate 121 is set to be smaller than
In addition, the blade piece 12 which is larger than the aforementioned
2 is installed.

By doing so, the centrifugal fan 3
Since the portion where the main plate 121 and the side plate 37 of No. 4 do not overlap in the axial direction is eliminated, the centrifugal fan 34 can be molded with a simple mold that bisects in the axial direction, and the core is not required, thereby improving the productivity. Can be done. The ninth embodiment may be implemented in combination with at least one configuration of the second to eighth embodiments.

Further, the centrifugal fan 34 may be replaced with a mixed flow fan. Furthermore, as a whole machine, what is necessary is just a fully-closed type, it is not limited to the above-mentioned fully-closed outer fan type, and it may be a fully-closed self-cooling type or the like that naturally cools, and is not limited to an electric motor. It can be applied to generators. In addition, the fan 34, the concave / convex portions 61 and 62, the concave portions 71 and 72, the fins 81, 91 and 101, and the axial fan 111 are provided on only one side, not on both sides as shown in the figure. Is also good. In addition, the present invention is not limited to the embodiment described above and shown in the drawings, and can be implemented with appropriate modifications without departing from the scope of the invention.

[0042]

The present invention is as described above.
The following effects are obtained. According to the rotating electric machine of the first aspect, the inner surface of the stator winding is formed by a centrifugal or mixed flow fan provided inside the machine with the outer surface of the side plate facing the inner surface of the end of the stator winding. Heat can be actively transmitted from the end to the stator frame, and the temperature rise of the stator winding can be effectively suppressed.

According to the rotating electric machine of the second aspect, heat can be actively transmitted from the end ring to the stator frame through the inside air, and the temperature of the end ring and the temperature of the rotor conductor can be reduced. Can be suppressed. Claim 3,
According to the rotating electric machine of No. 4, it is possible to prevent the inside air whose temperature has risen by receiving heat from the ends of the stator windings from dissipating heat to the bearing bracket or reaching the bearing portion, thereby effectively reducing the temperature rise of the bearing. Can be suppressed.

According to the rotating electric machine of the fifth, sixth, and seventh aspects, the inside air received from the end of the stator winding by the fin provided on the inner side surface of the stator frame facing the end of the stator winding. The heat transfer from the coil to the stator frame can be more actively performed, and the temperature rise of the stator winding 23 can be further effectively suppressed.

According to the rotating electric machine of the eighth aspect, the heat generated by the rotor and reaching the bearing via the rotating shaft can be reduced.
The temperature rise of the bearing can also be effectively suppressed.
In this case, the flow of the inside air can be further increased, and the temperature rise of the stator winding and the temperature rise of the bearing can be more effectively suppressed. According to the rotating electric machine of claim 9,
The centrifugal fan can be molded with a simple mold that halves in the axial direction, and the productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of an upper half showing a first embodiment of the present invention.

FIG. 2 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 3 is a view corresponding to FIG. 1, showing a third embodiment of the present invention;

FIG. 4 is a view corresponding to FIG. 1, showing a fourth embodiment of the present invention;

FIG. 5 is a view corresponding to FIG. 1, showing a fifth embodiment of the present invention.

FIG. 6 is an enlarged vertical sectional side view of a fin portion.

FIG. 7 is a diagram corresponding to FIG. 6, showing another flow of inside air.

FIG. 8 is a view corresponding to FIG. 1, showing a sixth embodiment of the present invention.

FIG. 9 is a diagram corresponding to FIG. 6;

FIG. 10 is an enlarged vertical sectional front view of a fin portion showing another flow of inside air.

FIG. 11 is a view corresponding to FIG. 1, showing a seventh embodiment of the present invention.

FIG. 12 is a diagram corresponding to FIG. 6;

FIG. 13 is a view corresponding to FIG. 1, showing an eighth embodiment of the present invention.

FIG. 14 is a view corresponding to FIG. 1, showing a ninth embodiment of the present invention;

FIG. 15 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

21 is a stator, 22 is a stator core, 23 is a stator winding,
23a is an end of a stator winding, 24 is a stator frame, 26 is a rotor, 27 is a rotor core, 28 is a rotor conductor, 29 is an end ring, 30 is a rotating shaft, 31 is a bearing bracket, 3
2 is a bearing, 34 is a centrifugal fan, 35 is a main plate, 36 is a blade piece, 37 is a side plate, 51 is a side plate, 61 and 62 are uneven portions, 7
1, 72 are concave portions, 81, 91, 101 are fins, 111
Denotes an axial fan, 121 denotes a main plate, and 122 denotes a blade piece.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H609 BB02 BB19 PP01 PP02 PP05 PP06 PP07 PP08 PP09 PP11 QQ02 QQ10 QQ12 QQ13 QQ23 RR03 RR10 RR16 RR18 RR24 RR27 RR32 RR33 RR35 RR40 RR42 RR43 RR63 RR67 RR

Claims (9)

[Claims] A stator having a stator winding on a stator core; a stator frame surrounding the stator; a rotor provided inside the stator and having a rotation axis; And a bearing bracket supporting the bearing via a bearing, a centrifugal or diagonal fan is mounted on a portion of the rotating shaft located in the machine, and the fan has a circular A rotating electric machine wherein an outer surface of a side plate is opposed to an inner surface of an end of the stator winding. 2. A rotor having an end ring for short-circuiting a rotor conductor housed in a rotor core, or a permanent magnet disposed thereon, wherein a fan is provided at the end of the end ring or the permanent magnet. 2. The rotating electric machine according to claim 1, wherein the end portions of the side plates are brought close to each other. 3. The rotary electric machine according to claim 1, wherein the main plate on which the blade pieces of the fan are mounted and the bearing bracket are provided with concave and convex portions which are intertwined with each other. 4. An outer peripheral edge of a main plate in which an annular concave portion is formed on a bearing bracket side or a stator frame side of a portion where a bearing bracket and a stator frame are in contact, and a fan blade piece is mounted in the concave portion. 2. The device according to claim 1, wherein the portions are brought close to each other.
The rotating electric machine as described. 5. The rotating electric machine according to claim 1, wherein a fin extending in a circumferential direction is provided on an inner surface of the stator frame facing an end of the stator winding. 6. The rotating electric machine according to claim 1, wherein a fin extending in an axial direction is provided on an inner side surface of the stator frame facing an end of the stator winding. 7. The rotating electric machine according to claim 1, wherein pin-shaped fins are provided on an inner surface of the stator frame facing an end of the stator winding. 8. The rotating electric machine according to claim 1, wherein an axial fan or a mixed flow fan is attached to a portion of the rotating shaft located inside the side plate of the fan. 9. The rotating electric machine according to claim 1, wherein the outer diameter of the main plate to which the blade pieces of the fan are attached is smaller than the inner diameter of the side plate.