JP2004364365A - Fully-closed self-cooling electric motor for driving a vehicle and method for manufacturing a cooler provided in the electric motor - Google Patents

Abstract

Provided is a fully-closed self-cooling electric motor for driving a vehicle, which can reduce the size and weight of the vehicle by improving cooling performance and save labor for maintenance.
A cooling device provided in a fully-closed self-cooling electric motor for driving a vehicle includes a connecting wind path provided outside openings at both ends of a stator frame, and a flat surface disposed between the connecting wind paths. , Cooling air paths 25, 26, gap air paths 27 formed by opposing flat surfaces of the cooling air paths 25, 26 between the opposing surfaces, and provided on inner peripheral walls of the cooling air paths 25, 26. A plurality of heat absorbing fins 28 and a plurality of heat dissipating fins 29 provided on outer peripheral walls of the cooling air passages 25 and 26, and one end of each internal space of the connection air passage 21 is connected to the stator frame 1 through an opening of the stator frame 1. The other end is communicated with the internal space of the cooling air passages 25 and 26 while communicating with the internal space.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fully-closed self-cooling electric motor for driving a vehicle such as a railway having a closed structure that does not take in outside air into a machine, and a method for manufacturing a cooler provided in the electric motor.
[0002]
[Prior art]
In general, in a railway vehicle such as a train, a vehicle driving motor is loaded on a bogie arranged under the vehicle body, and the rotational force of the motor is transmitted to wheels via a gear device so that the vehicle travels. I have.
[0003]
2. Description of the Related Art Conventionally, an electric motor of this type employs an open-type self-ventilation cooling system in which outside air is circulated and cooled by driving a ventilation fan fixed to a rotor shaft in the machine during operation.
[0004]
Such an open-type self-ventilated electric motor has a ventilation filter at an air inlet to prevent the inside of the motor from being contaminated by dust mixed into the cooling outside air, and a dust filter of the inflowing outside air is provided by a filter in the ventilation filter. Has been captured. Further, in order to prevent the temperature rise of the electric motor from increasing due to the decrease in the inflow outside air due to the clogging of the filter, the filter is cleaned in a relatively short period.
[0005]
However, it is difficult to completely capture the dust with a filter, so dust that has entered the machine will adhere to various parts of the machine and gradually accumulate, resulting in reduced insulation performance and reduced cooling effect. It was necessary to clean the inside to remove dust.
[0006]
The use of a fully-closed self-cooling motor has been studied for the purpose of saving labor for the maintenance of the filter and extending the cycle of disassembling and cleaning the motor. The structure of the fully-closed self-cooling electric motor will be described with reference to FIGS.
[0007]
9 and 10, a cylindrical stator core 2 is provided on an inner peripheral portion of a cylindrical bottomed stator frame 1, and a large number of grooves are provided in a circumferential portion of the stator core 2; The coil 3 is mounted. Bearing brackets 4 and bearing housings 5 having built-in bearings 6 and 7 are attached to both ends of the stator frame 1, and the bearings 6 and 7 support both ends of the rotor shaft 8.
[0008]
A rotor core 9 is attached to the center of the rotor shaft 8, and a number of grooves are provided on the outer periphery of the rotor core 9, and a rotor bar 10 is attached to the center of the grooves. Both ends of the rotor bar 10 are integrally bound by an end ring (short-circuit ring) to form a cage rotor of the induction motor as a whole.
[0009]
On the inner peripheral side of the rotor core 9, a plurality of ventilation holes 9a are provided on the circumference. A circulation fan 11 for circulating inside air is installed inside the rotor shaft 8.
[0010]
Ventilation holes 1a and 1b are provided at both ends of the stator frame 1, and a cooler including connection air paths 12, 13 and a plurality of pipes 14 and a plurality of cooling fins 15 is provided so as to cover the ventilation holes 1a and 1b. It is attached to the outside of the rotor frame 1 by bolts.
[0011]
The electric motor has an arm portion 1C provided on the stator frame 1 fixed to a bogie frame by bolts, and a rotor shaft end 8a protruding outside the machine is connected to a gear device (not shown) via a joint. By connecting to the axle integral with the wheels, the configuration is such that the torque of the electric motor is transmitted to the wheels.
[0012]
Under such a configuration, by rotation of the circulation fan 11 at the time of operation, the inside air inside the machine enters the air inlet passage 12a of the cooler from the vent 1a, and further flows through the plurality of air passages 14a to the exhaust passage 13a. After entering, it flows into the airplane through the vent 1b. The inside air flowing into the machine flows through the ventilation holes 9 a of the rotor core and returns to the inner diameter side of the circulation fan 11.
[0013]
As described above, in the fully-closed self-cooling electric motor, the inside air circulates and flows between the inside of the cooler and the inside of the machine during operation. During operation, the stator coil 3, the rotor bar 10 and the end ring generate heat, thereby increasing the temperature of each part in the machine. However, the heated inside air is cooled by the cooling fins 15 when flowing through the ventilation passage 14 a in the cooler. The inside air flows through the inside of the machine to cool the inside of the machine, thereby preventing the temperature rise of the stator coil 3 and the rotor bar 10 from exceeding a specified value.
[0014]
The cooling fins 15 are arranged in the same direction as the traveling direction of the vehicle at right angles to the longitudinal direction of the electric motor, so that the traveling wind flows between the cooling fans 15. Thereby, the heat radiation effect of the cooling fins 15 is improved, and the cooling performance of the inside air flowing through the ventilation path 14 is improved.
[0015]
With such a configuration, the motor is cooled without allowing the outside air to flow through the inside of the machine, so that the filter of the ventilation filter becomes unnecessary and the inside of the machine is completely free of contamination, so that the disassembling cycle of the motor can be extended, and maintenance can be performed. Can save labor.
[0016]
However, in the fully-closed self-cooling electric motor for driving a vehicle having this structure, since the ventilation passages 14a of the cooler are arranged in a densely arranged state by a pipe structure and further separated by a large number of cooling fins 15, the outside air is cooled. Dust, paper and cloth dust easily adhere, and gradually clog between the pipes with the elapse of the use period, thereby lowering the cooling performance.
[0017]
Therefore, it is necessary to periodically blow compressed air or the like to remove the dust and cloth dust. However, since the pipes 14 and the cooling fins 15 are intersected, the dust adhering to the back is required. Etc. are difficult to remove sufficiently.
[0018]
As a solution to this problem, the applicant has previously proposed a fully-closed self-cooling electric motor for a vehicle disclosed in Patent Document 1.
[0019]
This electric motor will be described with reference to FIGS.
[0020]
In FIGS. 11 and 12, the cooler includes connecting air passages 16 and 17, one air passage 18, a large number of heat absorbing fins 19 provided on the inner wall of the air passage 18, and a large number of heat radiation fins provided on the outer wall of the air passage 18. The heat absorbing fins 19 are formed by the fins 20 and are arranged in the same direction as the longitudinal direction of the wind path 18, and the heat radiating fins are arranged in the same direction as the traveling direction of the vehicle at right angles to the longitudinal direction of the wind path 18.
[0021]
During the operation of the electric motor, the inside air flows into the intake passage 16a from the vent 1a of the stator frame 1 by the rotation of the circulation fan 11, and then flows through the ventilation passage 18a in the air passage 18, and passes through the exhaust passage 17a. Flows through the ventilation holes 9a of the rotor core inside the machine and returns to the inner diameter side of the circulation fan 11.
[0022]
In the cooler having this structure, the cooling outside air flowing when the vehicle travels flows along the outer peripheral surface of one wind path 18, so that dust and debris mixed in the outside air may adhere to the wind path 18 and the radiation fins and stop. No dust is deposited even for a long period of time. Further, cleaning work such as air blowing is easy and dust can be reliably removed.
[0023]
Further, since a large number of heat absorbing fins are provided on the inner wall of the wind path 18, the heat absorbing area can be increased as compared with the conventional pipe structure, and the heat of the inside air can be efficiently absorbed and transmitted to the radiation fins 20. As a result, the cooling effect of the inside air is improved.
[0024]
As described above, in the vehicle drive motor having the structure shown in FIGS. 11 and 12, the maintenance and the cooling performance can be improved.
[0025]
[Patent Document 1]
Japanese Patent Application Laid-Open No. H11-35601
[Problems to be solved by the invention]
However, the above-described fully-closed self-cooling type electric motor has an inferior cooling function as compared with the open self-ventilated cooling type electric motor, so that it is inevitable that the motor becomes large.
[0027]
In recent years, the speed and performance of vehicles have been remarkably increasing, and demands for higher output and smaller and lighter drive motors have been increasing. At the same time, the need for labor-saving maintenance has led to improvements in cooling performance. It is desired that a fully-closed, self-cooling electric motor that is small and light is realized.
[0028]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a fully-closed self-cooling electric motor for driving a vehicle and a method of manufacturing a cooler provided in the electric motor, which enables a reduction in size and weight and a reduction in maintenance labor by improving cooling performance.
[0029]
[Means for Solving the Problems]
In order to solve the above problems, a fully-closed self-cooling electric motor for driving a vehicle according to the present invention is provided with an inside air circulation fan having one end attached to the inside of a rotor shaft, and providing openings on both ends of a stator frame. For a vehicle drive for providing a cooler outside the stator frame and for cooling by circulating air inside the cooler by communicating the internal space of the cooler with the openings on both sides of the stator frame. In a fully closed self-cooling motor,
The cooling device includes: a connecting air passage provided outside each of the openings at both ends of the frame; a cylindrical cooling air passage having at least two flat surfaces disposed between the connecting air passages; A gap ventilation path formed by opposing flat surfaces of the path and formed between the opposing faces, a plurality of heat absorbing fins provided on an inner peripheral wall of the cooling air path, and a plurality of heat dissipating fins provided on an outer peripheral wall of the cooling air path. Wherein one end of each internal space of the connection air passage communicates with the internal space via an opening of the stator frame, and the other end communicates with the internal space of the cooling air passage. And
[0030]
According to the fully-closed self-cooling electric motor for driving a vehicle of the present invention, when the circulating fan rotates during operation, the air inside the device circulates and circulates in the cooler, and when circulating in the cooling air path, the heat of the air is The heat is efficiently transmitted to a larger number of heat absorbing fins than the conventional heat absorbing fins over the entire circumference of the road inner wall, and is discharged to the outside air from the heat radiation fins provided on the outer peripheral wall of the cooling air path. Further, since the cooling outside air flows through the gap ventilation passage formed between the cooling air passages, heat radiation to the outside air is further improved. Therefore, the cooling performance of the circulating air by the cooler is improved, and the temperature rise of the electric motor can be reduced, so that the electric motor can be reduced in size and weight or the output can be increased.
[0031]
A method for manufacturing a cooler provided in a fully closed self-cooling electric motor for driving a vehicle according to the present invention includes providing an inside air circulation fan having one end attached to the inside of a rotor shaft, providing openings on both ends of a stator frame, For a vehicle drive for providing a cooler outside the stator frame and for cooling by circulating air inside the cooler by communicating the internal space of the cooler with the openings on both sides of the stator frame. In the method of manufacturing the cooler in a fully closed self-cooling type electric motor,
Form a plurality of vertically divided cooling air passages in the longitudinal direction,
A plurality of heat absorbing fins are attached to the inner wall surface of each divided cooling air path by welding,
Align the divided cooling air paths to which the heat absorbing fins are attached, weld the mating surfaces to form an integral cylindrical cooling air path,
A plurality of radiation fins are welded to the outer peripheral wall surface of the cylindrical cooling air passage, and connection air passages are welded to both ends of the cooling air passage.
[0032]
According to the present invention, attachment of the heat absorbing fins to the inner wall of the cooling air passage by welding can be performed reliably and easily over the entire length of the cooling air passage in the longitudinal direction, and at the same time, more heat absorbing fins are provided at narrow intervals. Since the fins can be attached, the heat of the circulating air flowing through the cooling air passage is efficiently absorbed by the heat absorbing fins and efficiently transmitted to the cooling air passage, and further transmitted from the cooling air passage to the radiation fins. Therefore, the cooling performance of the circulating inside air is improved. In addition, when the radiation fins are welded to the outer peripheral wall surface of the cooling air passage, the work is improved because there is no welding at the narrow portion facing the gap ventilation passage.
[0033]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0034]
(First Embodiment)
1 to 3 show the configuration of a fully-closed self-cooling motor for driving a vehicle according to a first embodiment of the present invention.
[0035]
1 to 3, a cylindrical stator core 2 is mounted on an inner peripheral surface of a stator frame 1, and a stator coil 3 is placed in a large number of grooves provided around the entire inner peripheral portion of the stator core 1. At both ends of the frame 1, a bearing bracket 4 having a built-in bearing 6 and 7 and a bearing housing 5 are attached, and the rotor shaft 8 is supported by the bearings 6 and 7.
[0036]
A rotor core 9 is attached to a longitudinal center portion of the rotor shaft 8, and a plurality of grooves are provided on the outer periphery of the rotor core 9 over the entire circumference, and a rotor bar 10 is housed in the grooves, and an inner periphery of the rotor core 9 is provided. On the side, a plurality of ventilation holes 9a are formed over the circumference. A circulating fan 11 for circulating inside air is attached to one end of the rotor shaft 8 at an in-machine position.
[0037]
Vent holes 1a, 1b are provided at both ends in the longitudinal direction of the stator frame 1, and connection air paths 21, 23 are respectively attached to the outside of the stator frame 1 so as to cover the air holes 1a, 1b. A cylindrical first cooling air passage 25 and a second cooling air passage 26 extending in the same direction as the longitudinal direction of the stator frame 1 are provided between the first cooling air passage 21 and the second cooling air passage 26.
[0038]
The inside of the connection air passage 21 is partitioned by a guide plate 22 into a first inlet passage 21a and a second inlet passage 21b, and the inside of the connection air passage 23 is separated by a guide plate 24 into a first exhaust passage 23a. And a second exhaust passage 23b.
[0039]
One end side of the first ventilation passage 25a formed in the first cooling air passage 25 communicates with the drive-side internal space via the first inlet passage 21a and the ventilation port 1a. The other end side of the ventilation passage 25a communicates with the inside space on the non-drive side via the first exhaust passage 23a and the ventilation port 1b.
[0040]
One end of a second ventilation passage 26a formed in the second cooling air passage 26 communicates with the drive-side internal space via a second air passage 21b and a ventilation port 1a. The other end of the ventilation passage 26a communicates with the inside space on the non-drive side via the second exhaust passage 23b and the ventilation port 1b.
[0041]
Flat surfaces are formed on the outer peripheral surfaces of the cooling air passages 25 and 26, respectively, and a gap ventilation passage 27 is formed between the cooling air passages 25 and 26 with the flat surfaces facing each other. A large number of heat absorbing fins 28 extending in the longitudinal direction of the cooling air passages 25 and 26 are arranged on the inner peripheral wall surface of each of the cooling air passages 25 and 26.
[0042]
Further, a large number of radiating fins 29 are arranged on the outer peripheral wall surfaces of the cooling air passages 25 and 26 in a direction perpendicular to the longitudinal direction of the cooling air passages 25 and 26.
[0043]
Note that no radiation fins are provided on the outer peripheral wall surfaces of the cooling air passages 25 and 26 that face the gap ventilation passage 27 formed between the cooling air passages 25 and 26.
[0044]
Next, a method of manufacturing the cooler according to the present embodiment will be described with reference to FIG.
[0045]
The first cooling air path 25 is composed of a cover 25A and a cover 25B that are vertically divided into two in the longitudinal direction, and a large number of heat absorbing fins 28 are sequentially welded to the inner peripheral wall surfaces of the cover 25A and the cover 25B first ( Install according to b).
[0046]
Next, the cover 25A and the cover 25B are combined into a cylindrical shape, and the two combined portions are integrated by welding (b) to complete the first cooling air passage 25.
[0047]
The second cooling air passage 26 is completed in the same manner.
[0048]
Next, the first cooling air path 25 and the second cooling air path 26 are arranged in a predetermined positional relationship, and a gap ventilation path 27 is provided between the first cooling air path 25 and the second cooling air path 26. Is formed, a large number of radiating fins 29 are sequentially welded to the outer peripheral walls of the cooling air passages 25 and 26 (c).
[0049]
Next, connecting air passages 23 and guide plates 22 are attached to both ends of the cooling air passages 25 and 26 to complete the cooler.
[0050]
The operation of the thus-configured fully-closed self-cooling motor for driving a vehicle according to the present embodiment will be described below.
[0051]
That is, as shown in FIG. 1, during operation of the electric motor, the air inside the machine is blown up into the outer peripheral space of the circulation fan 11 by the rotation of the circulation fan 11, and then the first inlet of the connection airway 21 through the ventilation port 1 a. After flowing into the path 21a and the second inlet path 21b, they flow through the first ventilation path 25a and the second ventilation path 26a, respectively, and the first exhaust path 23a and the second exhaust path in the connection air path 23. The air flows into the in-machine space on the side opposite to the drive from the ventilation port 1b via the path 23b.
[0052]
The inside air flowing into the machine flows through the gap between the outer peripheral surface of the rotor core 9 and the inner peripheral surface of the stator core 2 and the ventilation hole 9 a of the rotor core 9 in the axial direction and returns to the inner diameter side of the circulation fan 11.
[0053]
In this way, during operation, the air inside the machine circulates and circulates through the cooler.
[0054]
When air inside the machine flows through the first ventilation passage 25a and the second ventilation passage 26a, a large number of heat absorbing fins 28 absorb heat and transmit it to the cooling air passages 25 and 26, and further a large number of radiation fins. Released into the atmosphere by 29.
[0055]
This cooling effect is achieved by providing a large number of heat absorbing fins 28 on the entire peripheral surface of the inner peripheral wall in the two cooling air passages 25 and 26, so that the number of heat absorbing fins 28 is greatly increased as compared with the conventional case. At the same time, a large number of radiating fins 29 are provided on the outer peripheral surfaces of the cooling air passages 25 and 26, and are arranged in the same direction as the vehicle travels. And the heat is efficiently released to the outside air to sufficiently circulate the air, so that the cooling effect is improved.
[0056]
Further, since the cooling outside air flows through the gap ventilation passage 27 formed between the first cooling air passage 25 and the second cooling air passage 26, the cooling air passages 25 and 26 facing this surface also radiate heat. As a result, the cooling action is further promoted.
[0057]
The inside air flowing into the connection air passage 21 from the inside of the machine through the ventilation port 1a is evenly introduced into the two cooling air passages 25 and 26 by the guide plate 22, and does not concentrate on one side and circulates. As a result, the cooling action in the cooling air passages 25 and 26 is efficiently performed.
[0058]
Further, since the heat absorbing fins 28 in the cooling air passages 25 and 26 are arranged along the flowing direction of the inside air, the flow resistance of the inside air can be reduced and the amount of circulating air can be increased, so that the cooling performance can be improved.
[0059]
The cooler is generally made of a thin steel plate, but may be made of an aluminum plate in order to reduce the weight and improve the cooling performance. However, since welding of an aluminum plate is not easy, when the welding portion is a narrow portion or when there are many heat absorbing fins and heat radiating fins, the aluminum plate tends to be naturally made of steel rather than aluminum.
[0060]
On the other hand, in the cooler of the present embodiment, the heat absorbing fins 28 are welded to the inner peripheral wall surfaces of the cooling air passages 25 and 26 vertically divided into two by the method shown in FIG. Further, when the radiation fins 29 are welded to the outer peripheral wall surfaces of the cooling air passages 25 and 26, there is no welding at the narrow portion facing the gap ventilation passage 27, so that the welding operation can be easily performed. Thereby, the entire cooler can be made of aluminum material, and the weight can be reduced. In addition, the heat conductivity of the heat absorbing fins 28, the cooling air passages 25 and 26, and the heat radiating fins 29 is improved, and The cooling action can be further improved.
[0061]
During operation, the cooling air flows between the outer peripheral surfaces of the cooling air passages 25 and 26 and the radiating fins 29. However, since the cooling air passages 25 and 26 have two cylindrical shapes, dust and cloth debris are cooled. It hardly adheres to the air passage and the radiation fins 29, and even if dust adheres to the surface after long-term use, it can be easily cleaned and removed by air blowing or the like. Cooling outside air flows through a relatively narrow gap ventilation passage 27 between the two cooling air passages 25 and 26, but since this portion is a flat space without radiating fins, dust and dirt are not present. Cloth and the like are less likely to adhere. In addition, even if it adheres during long-term use, it can be easily cleaned and removed. Similarly, since the gap ventilation passage 27 is a flat space having no radiating fins, the cooling air (running wind) is not easily circulated through the gap ventilation passage when the vehicle is running, and the cooling air passage surface facing the gap ventilation passage is not provided. The cooling performance is improved, and the cooling performance does not decrease even if there are no radiating fins in this portion.
[0062]
As described above, in the fully-closed self-cooling motor for driving a vehicle according to the present embodiment, the cooling performance can be improved, so that the size and weight can be reduced or the output can be increased, and at the same time, the cleaning and maintenance of the cooler can be reduced. I can do it.
[0063]
(Second embodiment)
Next, a configuration of a fully-closed self-cooling electric motor for driving a vehicle according to a second embodiment of the present invention will be described with reference to FIGS. .
[0064]
In the present embodiment, a guide plate 30 is provided inside the connection air passage 21, and the guide plate 30 divides a passage flowing from the ventilation port 1 a into two parts in the axial direction (longitudinal direction) of the electric motor. The first inlet path 21c is communicated with the first ventilation path 25a, and the other second inlet path 21d is communicated with the second ventilation path.
[0065]
Generally, when the traveling direction of the vehicle is reversed, the motor for driving the vehicle is used with the rotation direction of the motor also reversed. In addition, the number of revolutions of the electric motor changes greatly according to the speed of the vehicle. Therefore, the inside air blown up to the outer peripheral side by the circulation fan 11 does not become radial but blows up obliquely depending on the rotation direction. Furthermore, the inclination of the blow-up angle increases as the rotation speed increases. Since the cooler is installed by partially using the space above the vehicle and above the vehicle, the cooler is not symmetrical with respect to the ventilation port 1a. Therefore, the direction and angle of the inside air flowing from the ventilation port 1a are limited. When the air temperature changes, the inside air flowing into the two ventilation paths 25a and 26a tends to flow in one direction.
[0066]
According to the present embodiment, since the ventilation port 1a is divided into two in the longitudinal direction of the electric motor by the guide plate 3D, even when the rotation direction and the number of rotations change, the same amount of inside air is necessarily supplied to the ventilation passages 25a and 26b. , So that the overall cooling performance does not decrease. Since the guide plate 30 exerts its effect only by being provided in the connecting air passage on the inlet side of the cooler, it need not necessarily be provided in the connecting air passage on the exhaust side.
[0067]
(Third embodiment)
Next, the configuration of a fully-closed self-cooling electric motor for driving a vehicle according to a third embodiment of the present invention will be described based on FIG. 7 in which the same parts as those in FIGS.
[0068]
In the present embodiment, a first cooling air passage 31, a second cooling air passage 32, and a third cooling air passage 33 are provided, and a first gap ventilation passage 34 and a second cooling air passage 34 are provided between the respective cooling air passages. A gap ventilation passage 35 is provided, and a number of heat absorbing fins 36, 37, 38 extending in the longitudinal direction of the cooling air passage are provided on the circumference of the inner peripheral wall surface of each cooling air passage. A large number of radiating fins 39 are arranged on the outer peripheral wall surface excluding the ventilation passages 34 and 35 in a direction perpendicular to the longitudinal direction.
[0069]
In the present embodiment, the configuration space of the cooler is restricted by external conditions, and the configuration is relatively flat. In this case, too, three cooling air passages are provided, and two gap ventilation passages are provided. By forming, the number of heat absorbing fins 36, 37, and 38 can be increased, and the inside air flowing through each cooling air passage can be equalized (leveled). Can be maintained and improved.
[0070]
(Fourth embodiment)
Next, a configuration of a fully-closed self-cooling electric motor for driving a vehicle according to a fourth embodiment of the present invention will be described with reference to FIG.
[0071]
In the present embodiment, a gap ventilation passage 43 is formed between the first cooling air passage 41 and the second cooling air passage 42, and a number of heat absorbing fins 46 and 47 are provided on the inner peripheral wall surface of each cooling air passage. At the same time, radiation fins 44 and 45 are provided on the outer peripheral wall surface of the first cooling air passage 41 and the outer peripheral wall surface of the second cooling air passage, respectively. The heat radiation fins 44 and 45 are not provided in a space having a height h extending before and after the ventilation passage 43.
[0072]
In the present embodiment, the cooling outside air is more easily circulated through the gap ventilation path 43, so that the cooling of the cooling air path surface facing the gap ventilation path 43 is improved, so that the gap ventilation path is relatively formed. This is effective when the area of the flat portion is large. As compared with the heat absorbing area of the heat absorbing fin provided inside the cooling air passage, the entire area of the heat radiating fin provided outside the cooling air passage can be easily configured to be large. Even if there is no heat radiation fin, the cooling performance does not decrease. Furthermore, since there is no radiating fin in the space before and after the gap ventilation passage 43, dust and cloth dust are unlikely to adhere even in long-term use, and cleaning and removal when adhered can be performed more easily.
[0073]
In each of the above-described embodiments, an example in which the cooler is manufactured from an aluminum material has been described. However, the cooler is made of another good heat conductive material instead of the aluminum material which is a good heat conductive material and a lightweight material. Can be manufactured.
[0074]
In addition, the electric motor is not limited to the squirrel-cage induction motor, but includes various types of fully-closed self-cooling electric motors for driving vehicles.
[0075]
The invention of the present application is not limited to the above embodiments, and can be variously modified in an implementation stage without departing from the gist of the invention. In addition, the embodiments may be implemented in appropriate combinations as much as possible, in which case the combined effects can be obtained. Furthermore, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, when an invention is extracted by omitting some constituent elements from all constituent elements described in the embodiment, when implementing the extracted invention, the omitted part is appropriately supplemented by well-known conventional techniques. It is something to be done.
[0076]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, since the cooling performance of the cooler of circulating inside air improves, the temperature rise of each part in a machine can be reduced, and the miniaturization and weight reduction of a motor or an increase in capacity (output) can be achieved. At the same time, it is possible to provide a fully-closed self-cooling motor for driving a vehicle and a method of manufacturing a cooler provided in the motor, which can save labor for maintenance of the cooler.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a fully closed self-cooling electric motor for driving a vehicle according to a first embodiment of the present invention.
FIG. 2 is a sectional view taken along line CC of FIG.
FIG. 3 is a sectional view taken along line DD of FIG. 1;
FIG. 4 is a diagram illustrating a method for manufacturing the cooler according to the first embodiment of the present invention.
FIG. 5 is a partial cross-sectional view showing a second embodiment of the present invention.
FIG. 6 is a partial longitudinal sectional view showing a second embodiment of the present invention.
FIG. 7 is a partial cross-sectional view showing a third embodiment of the present invention.
FIG. 8 is a partial cross-sectional view showing a fourth embodiment of the present invention.
FIG. 9 is a front view of a conventional fully-closed self-cooling electric motor for driving a vehicle.
FIG. 10 is a sectional view taken along line AA of FIG. 9;
FIG. 11 is a cross-sectional view of a conventionally proposed fully-closed self-cooling electric motor for driving a vehicle.
FIG. 12 is a sectional view taken along line BB of FIG. 11;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Stator frame, 1a, 1b ... ventilation hole, 9 ... rotor iron core, 9a ... ventilation hole, 11 ... circulation fan, 21 ... connection airway, 22 ... guide plate, 23 ... connection airway, 25 ... 1st cooling Wind path, 26: second cooling air path, 27: gap ventilation path, 28: heat absorbing fin, 29: heat radiating fin, 30: guide plate, 31: first cooling air path, 32: second cooling air path 33, a third cooling air passage, 34, a first gap air passage, 35, a second gap air passage, 36, 37, 38, a heat absorbing fin, 39, a radiation fin, 41, a first cooling air passage , 42: second cooling air path, 43: gap ventilation path, 44, 45: radiation fins, 46, 47: heat absorption fins.

Claims (7)

An inside air circulation fan having one end attached to the inside of the rotor shaft is provided, openings are provided at both ends of the stator frame, a cooler is provided outside the machine of the stator frame, and the internal space of the cooler is filled with the stator frame. In a fully-closed self-cooling motor for driving a vehicle that performs cooling by circulating and circulating in-machine air in the cooler by communicating with the openings on both sides of the motor,
The cooling device includes: a connecting air passage provided outside each of the openings at both ends of the frame; a cylindrical cooling air passage having at least two flat surfaces disposed between the connecting air passages; A gap ventilation path formed by opposing flat surfaces of the path and formed between the opposing faces, a plurality of heat absorbing fins provided on an inner peripheral wall of the cooling air path, and a plurality of heat dissipating fins provided on an outer peripheral wall of the cooling air path. Wherein one end of each internal space of the connection air passage communicates with the internal space via an opening of the stator frame, and the other end communicates with the internal space of the cooling air passage. A fully closed self-cooling electric motor for driving a vehicle. 2. The fully-closed self-cooling motor for driving a vehicle according to claim 1, wherein the cooling fin is not provided, and a plurality of radiating fins are provided on an outer peripheral wall surface of the cooling air path excluding this portion. A plurality of heat absorbing fins provided on an inner peripheral wall surface of the cooling air path are arranged on the entire circumference so as to be longer in a longitudinal direction of the cooling air path, and a plurality of heat dissipating fins provided on an outer peripheral wall surface of the cooling air path are formed by cooling air. The fully-closed self-cooling motor for driving a vehicle according to claim 1 or 2, wherein the motor is arranged in a direction orthogonal to a longitudinal direction of the road. 2. A structure in which a guide plate is provided inside the air inlet side of the connection air passage, and the guide plate shunts the inside air flowing from the air inlet and introduces the air into a plurality of cooling air passages. The fully-closed self-cooling electric motor for driving a vehicle according to any one of claims 3 to 3. A plurality of independent radiating fins provided on the outer peripheral wall surface of each of the plurality of cooling air passages, and a gap ventilation passage formed between the cooling air passages with their flat surfaces facing each other; The fully closed self-cooling motor for driving a vehicle according to any one of claims 1 to 4, wherein the heat radiation fins are not disposed in a space range where a road extends. An inside air circulation fan having one end attached to the inside of the rotor shaft is provided, openings are provided at both ends of the stator frame, a cooler is provided outside the machine of the stator frame, and the internal space of the cooler is filled with the stator frame. In the method for manufacturing the cooler in a fully-closed self-cooling motor for driving a vehicle that cools by circulating in-machine air in the cooler by communicating with the openings on both sides of the cooler,
Form a plurality of vertically divided cooling air passages in the longitudinal direction,
A plurality of heat absorbing fins are attached to the inner wall surface of each divided cooling air path by welding,
Align the divided cooling air paths to which the heat absorbing fins are attached, weld the mating surfaces to form an integral cylindrical cooling air path,
A cooler provided in a fully-closed self-cooling motor for driving a vehicle, wherein a plurality of radiating fins are welded to an outer peripheral wall surface of the cylindrical cooling air path and connection air paths are welded to both ends of the cooling air path. Manufacturing method. At least the connecting air path, the cooling air path, the heat absorbing fins, and the heat radiating fins that constitute the cooler are made of a good heat conductive material, and the cooler is a stator of the fully closed self-cooling electric motor for driving the vehicle. The method for manufacturing a cooler provided in a fully-closed self-cooling motor for driving a vehicle according to claim 6, wherein the cooler is detachably attached to the outside of the frame.

Images