JP2003143809A - Totally-enclosed fan-cooled motor for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a totally-enclosed main motor which enables a reduction of a rotor temperature, a reduction of a bearing temperature, and, further, a reduction of fan noise. SOLUTION: This totally-enclosed fan-cooled motor has an air fan (19) which is provided on a side opposite to a drive side and makes cooling air flow through a first ventilation path (20) formed in a stator core (14). An internal air fan (30) is provided on the drive side in a motor. A second ventilation path (31) is formed in a rotor core (16), a third ventilation path (32) is formed in the stator core (14), and the internal air is circulated through the second ventilation path (31) and the third ventilation path (32) by the internal air fan (30).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle full-closed outer fan type electric motor, and more particularly, to a stator core wound with a stator coil and a rotor core arranged opposite to the stator core.
The present invention relates to a vehicle totally enclosed outer fan type electric motor in which cooling air is made to flow through a first ventilation passage formed in an axial direction of a stator iron core by an outside air fan provided as an outside fan on the non-driving side.

[0002]

2. Description of the Related Art FIG. 12 shows a main part of a vehicle bogie equipped with a fully-closed outer fan type electric motor as a main electric motor. The main motor 1 is assembled integrally with the two-stage reduction gear device 2, and the integrated unit is supported by the bogie frame 3. The driving force of the main motor 1 is transmitted from the hollow shaft 4 supported by the gear box of the gear device 2 to the axle 6 via the universal joint 5, and the wheels 7 attached thereto are rotated to drive the vehicle. Let A relative displacement occurs between the bogie including the bogie frame 3 and the axle 6 and the wheels 7 due to the deflection of the shaft spring during traveling, but since this displacement is absorbed by the universal joint 5, the rotational force is transmitted without any trouble. It Since the drive-side shaft end of the main motor 1 is integrally connected to the pinion shaft 9 of the gear unit 2 via the joint 8, the rotor of the main motor 1 is supported only by the bearing 10 provided on the non-drive side. . Since the brake disk 11 and the universal joint 5 are provided on the side of the axle 6, the dimensions of the main electric motor 1, particularly the width dimension (diameter dimension) W.
Is greatly restricted.

Referring to FIGS. 13 and 14, the main motor 1
Will be further described. As an example, the main motor 1 is composed of a fully-closed fan-shaped induction motor, and both brackets 1
2, the stator core 14 fixed to the shaft 2, and the shaft 1
5 and a rotor iron core 16 attached to the upper part of the rotor.
A stator coil 17 is wound around the stator core 14,
A rotor bar 18 is housed in the rotor iron core 16.
The shaft 15 is supported by the bearing 10 on the non-driving side. The bearing 10 is lubricated with grease. The drive end of the shaft 15 is connected to the joint 8.

An outside air fan 19 formed as an external fan is fixed to the opposite end of the shaft 15. Between the outer peripheral surface of the stator core 14 and the bracket 12, a ventilation path (first
The cooling air P introduced from the end surface on the side opposite to the driving side of the electric motor by the outside air fan 19 through the mesh guard 45 removes heat from the electric motor in the process of passing through the air passage 20 to remove the cooling fin 21. It is discharged in the radial direction from the exhaust port provided.

[0005]

The cooling of the main motor 1 shown in FIGS. 13 and 14 is performed by passing the outside air through the ventilation passages 20 provided in the vertical direction of the stator iron core 14. When the passage 20 has a large ventilation resistance and a large amount of cooling air is required, it is necessary to provide a large outside air fan 19. However, a drawback of a large outside air fan is that the noise during operation becomes extremely large.

Further, the main electric motor 1 has a stator core 1
Since it is a method of cooling through the stator core 14
And the stator coil 17 is cooled well, but the rotor core 16 and the rotor bar 18 inside are hard to be cooled, and it is difficult to keep the temperature rise of the rotor below a specified value.

The bearing 10 is not exposed to cooling air,
The bearing 1 is directly affected by the temperature rise of the rotor.
It is quite difficult to keep the temperature rise of 0 below the specified value. Therefore, the lubricating grease of the bearing 10 deteriorates at an early stage, and the replacement work is required.

Therefore, an object of the present invention is to provide a full-closed traction motor capable of reducing the rotor temperature and the bearing temperature and further reducing the fan noise.

[0009]

In order to achieve the above object, the invention according to claim 1 is provided with a stator iron core around which a stator coil is wound and a rotor iron core arranged to face the stator iron core, and is provided on the opposite side to the outside. In a fully-closed fan-type electric motor for a vehicle, in which a cooling air is made to flow through a first ventilation path formed in the stator iron core along the axial direction by an outside air fan provided as a fan A second ventilation passage is formed in the rotor core and a third ventilation passage is formed in the stator core along the axial direction while the fan is provided.
The inside air is circulated through the second ventilation passage and the third ventilation passage by the inside air fan.

According to a second aspect of the present invention, in the vehicle fully-closed outer fan type electric motor according to the first aspect, a fourth ventilation passage having a vertically elongated hole in cross section is provided at a lateral position of an outer peripheral portion of the stator iron core. It is characterized in that the outside air is made to flow through the ventilation passage by an outside air fan.

According to a third aspect of the present invention, in the vehicle total-closed fan-type electric motor according to the second aspect, each of the first ventilation passage and the fourth ventilation passage has a quadrangular cross-sectional shape, and the third ventilation passage. It is characterized in that a cooling fin is provided on the inner wall portion of.

According to a fourth aspect of the present invention, in the vehicle fully-closed outer fan type electric motor according to the second aspect, the third ventilation passage and the fourth ventilation passage are arranged side by side in the circumferential direction, and both ventilation passages are arranged. The cross-sectional shape is a long hole long in the tangential direction of the stator core.

According to a fifth aspect of the present invention, in the vehicle total-closed outer fan type electric motor according to the first aspect, a part of the stator iron core is formed with a protruding portion protruding toward the axle side, and at least a third ventilation is provided. It is characterized in that the passage is provided in the protruding portion.

According to a sixth aspect of the present invention, in the vehicle total enclosed outer fan type electric motor according to the first aspect, a large number of cooling fins are arranged along the circumferential direction on the anti-drive side bracket and the inner wall surface of the housing. The cooling fins are aligned in the radial direction.

According to a seventh aspect of the present invention, in the fully-closed outer fan electric motor for a vehicle according to the first aspect, at least one of an upper portion and a lower portion of the stator iron core has a box-like structure that constitutes a fifth ventilation passage that runs in the axial direction. The cooling air passage is provided, the outside air is allowed to flow in the first ventilation passage, and the inside air is circulated by the inside air fan in the fifth ventilation passage.

According to an eighth aspect of the present invention, in the vehicle totally enclosed outer fan type electric motor according to the seventh aspect, heat absorbing fins are provided on the inner wall surface of the fifth ventilation passage, and heat radiating fins are provided on the outer wall surface. And

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION <First Embodiment> The first embodiment will be described with reference to FIGS.

The basic structure of the main motor shown here is shown in FIG.
It is identical to that already described with reference to 3,14. The feature of this main motor is that the fan 19 provided as an external fan
In addition, the second inner air fan 30 that functions as an inner fan is provided on the end surface portion of the rotor core 16 on the side opposite to the driving side.
Correspondingly, a plurality of ventilation passages (second ventilation passages) 31 penetrating in the axial direction are formed in the rotor core 16 in a circumferentially distributed manner, and the inside air is circulated in the electric motor by the outside air fan 19. The outside air fan 19 cools the stator iron core 14, and the inside air fan 30 forms an air passage (second air passage) 31 formed in the rotor iron core 16 and an air passage (third air passage) 32 formed in the stator iron core 14. Circulate the shy air through. As shown in FIGS. 2 and 5, the stator core 1
An air passage 34 (fourth air passage) having a long cross section in the circumferential direction is provided between both lateral positions of No. 4 and the cover 33, and the outside air is made to flow there by the outside air fan 19.

According to the above construction, the air inside the machine is circulated in the machine by the inside air fan 30 and is cooled in the process of passing through the ventilation passage 32 of the stator core 14 which is well cooled. The circulating air cools the rotor well and suppresses the temperature rise. Further, since the cooled circulating air enters the bearing 10, the temperature of the bearing 10 is suppressed. Further, since the rotor is cooled well, the temperature of the rotor is also lowered and the bearing 1
The thermal adverse effect on 0 is also reduced.

Since the outside air also circulates in the ventilation passage 33 provided in the stator core 14, the cooling performance of the stator core 14 is improved, the temperature of the stator core 14 is lowered, and at the same time, the temperature distribution of the entire electric motor is made uniform.

As described above, since the temperature gradient of the stator and the rotor is reduced and the cooling performance of the whole is improved, the ventilation amount of the outside air fan 19 can be made smaller than that of the conventional structure. Therefore, the outside air fan 19 can be made smaller (smaller in diameter), and as a result, noise can be reduced. Inside air fan 3
Since 0 is inside the machine, the generated sound is blocked to the outside, and the provision of the inside air fan 30 does not increase the noise. In addition to the ventilation passage 20, the ventilation passage 33
Is added, the air flow in the outer peripheral discharge portion of the outside air fan 19 is rectified, so that the fan efficiency is improved and the outside air fan 19 can be further downsized.

<Second Embodiment> The second embodiment will be described with reference to FIGS. The second embodiment includes various modifications, which will be described below in order.

In the embodiment shown in FIG. 6, the ventilation passages 20,
The cross-sectional shape of 32 is substantially quadrangular and is larger than the cross-sectional area of the ventilation passage 32. Ventilation path 3
A cooling fin 35 is provided on the inner wall portion of 2. As a result, the amount of circulating air in the inside air can be increased, and the cooling performance of the rotor and the bearing 10 can be further improved.

In the embodiment shown in FIG. 7, the ventilation passage 33 and the ventilation passage 32 are arranged side by side in the circumferential direction, and the cross-sectional shape is a long hole elongated in the tangential direction of the stator core 14. is there. Thereby, the cooling performance by the circulating air can be further improved.

In the embodiment shown in FIG. 8, the stator core 14 is projected toward the axle 6 (not shown) beyond the width W to form a projection 36, and the projection 36 is utilized to at least ventilate the air. The structure is such that the cross-sectional area of the passage 32 is enlarged, and the amount of circulating air in the inside air is increased to improve the cooling performance.

In the embodiment shown in FIG. 9, a large number of cooling fins are distributed in the circumferential direction on the inner side wall portion of the bracket 12 on the non-driving side and the inner side wall portion of the housing 37 adjacent to the bearing 10. 38 and 39 are arranged in the radial direction. As a result, the cooling effect of the bearing 10 by the circulating internal air that is cooled and flows into the machine can be improved.

In the embodiment shown in FIGS. 10 and 11, there is no change in allowing the outside air to flow through the ventilation passage 20 of the stator core 14 by the outside air fan 19. In this embodiment, a box-shaped cooling air passage forming the air passage 40 is provided on the outer peripheral surface of the stator iron core 14, and the air circulating inside the machine by the inside air fan 30 is made to flow into the air passage 40, so that the rotor and the bearing are Promote cooling of 10. The heat absorbing fins 41 and the heat radiating fins 4 are provided on the inner wall and the outer wall of the ventilation passage 40, respectively.
2 is provided, and cooling is performed by the stator iron core 14 and the traveling wind of the vehicle. The ventilation passage 40 may be provided in either the upper part or the lower part, or a plurality of ventilation paths 40 may be provided.

According to the embodiment shown in FIGS. 10 and 11, it is possible to expect further reduction in the temperatures of the rotor and the bearing by increasing the air flow rate of the circulating air and improving the cooling performance.

[0029]

According to the present invention, in addition to the outside air fan,
An inside air fan is provided in the drive side machine, and by this inside air fan, the inside air is circulated through the second air passage formed in the rotor core and the third air passage formed in the stator core, so that the rotor temperature and the bearing temperature can be reduced. In addition, the fan noise can be reduced.

[Brief description of drawings]

FIG. 1 shows the first embodiment according to the present invention as shown in FIG.
The longitudinal cross-sectional view expressed from the A line.

2 is a cross-sectional view of the left half as seen from the line D-D in FIG. 1, and a right half is a cross-sectional view as seen from the line EE of FIG.

FIG. 3 is a cross-sectional view taken along the line FF of FIG.

FIG. 4 is a vertical cross-sectional view taken along the line GO of FIG.

5 is a vertical cross-sectional view taken along the line H-O in FIG.

6 is a cross-sectional view of the modified example of the present invention taken along line D-D in FIG. 1, and a right half is a cross-sectional view taken along line F-F of FIG. 1.

FIG. 7 is a cross-sectional view showing another modification of the present invention.

FIG. 8 is a cross-sectional view showing another modification of the present invention.

FIG. 9 is a vertical cross-sectional view of a main part showing another modification of the present invention.

FIG. 10 is a transverse cross-sectional view of a main part showing another modification of the present invention.

11 is a vertical cross-sectional view taken along the line JO of FIG.

FIG. 12 is a plan view of an LRV drive device.

FIG. 13 is a vertical cross-sectional view taken along the line AA of FIG.

14 is a horizontal cross-sectional view taken along the line BB of FIG. 13, and a left half is a cross-sectional view taken along the line C-C of FIG.

[Explanation of symbols]

1 main motor 2 gears 3 bogie frame 4 hollow shaft 5 universal joints 6 axles 7 wheels 8 joints 9 pinion shaft 10 bearings 11 brake discs 12 brackets 13 bracket 14 Stator iron core 15 shaft 16 rotor iron core 17 Stator coil 18 rotor bar 19 fans 20 First ventilation passage 21 cooling fins 30 fans 31 Second ventilation passage 32 Third ventilation passage 33 cover 34 Fourth ventilation passage 35 cooling fins 36 Projection 37 housing 38 cooling fins 39 Cooling fin 40 fifth ventilation passage 41 endothermic fins 42 Radiation fin 45 mesh guard

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Nobuyuki Yagi             1-24 East, 2-24 Harumi-cho, Fuchu-shi, Tokyo             Shiba Transport Engineering Stock Association             In-house (72) Inventor Shunichi Kawaji             No. 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation             Fuchu Office (72) Inventor Shigeru Shiraishi             No. 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation             Fuchu Office F term (reference) 5H609 BB02 BB12 BB18 PP02 PP05                       PP06 PP07 PP08 PP09 PP10                       PP11 QQ02 QQ10 QQ12 QQ18                       QQ23 RR02 RR22 RR27 RR36                       RR63 RR69

Claims (8)

[Claims] 1. A stator core around which a stator coil is wound, and a rotor core arranged to face the stator core, and an outside air fan provided as an external fan on the non-driving side forms the stator core along the axial direction. In a fully-closed external fan electric motor for a vehicle in which cooling air is allowed to flow through the first ventilation passage, an inside air fan is provided as an inner fan in the drive side machine, and a second ventilation passage is provided in the rotor core. Third air passages are formed in the iron core along the axial direction, respectively, and the second air passages and the third air passages are formed by the inside air fan.
A fully-closed fan-type electric motor for a vehicle, which circulates the inside air through the ventilation passage of. 2. The fully-closed fan electric motor for a vehicle according to claim 1, wherein a fourth ventilation passage having a vertically long hole in cross section is provided at a lateral position of an outer peripheral portion of the stator core, and the outside air is provided in the fourth ventilation passage. A fully-enclosed external fan electric motor for a vehicle, which allows the outside air to flow by a fan. 3. The vehicle full-closed fan-type electric motor according to claim 2, wherein the first ventilation passage and the fourth ventilation passage have respective rectangular cross-sections, and the third ventilation passage has an inner wall portion. A fully-closed fan-type electric motor for vehicles, which is equipped with cooling fins. 4. The vehicle full-closed fan-type electric motor according to claim 2, wherein the third ventilation passage and the fourth ventilation passage are arranged side by side in the circumferential direction, and the cross-sectional shapes of both ventilation passages are the same. A fully-closed outer fan electric motor for a vehicle, which has a long hole shape elongated in a tangential direction of a stator core. 5. The fully-closed external fan electric motor for a vehicle according to claim 1, wherein a part of the stator iron core is formed with a protrusion protruding toward an axle side, and at least the third ventilation passage is protruded. A fully-closed fan-type electric motor for vehicles, which is characterized in that it is provided in the section. 6. The fully-closed fan-type electric motor for a vehicle according to claim 1, wherein a large number of cooling fins are arranged circumferentially on the non-drive side bracket and the inner wall surface of the housing, and the cooling fins radiate. A fully-closed outer fan electric motor for a vehicle, which is aligned when viewed in the direction. 7. The fully-closed fan electric motor for a vehicle according to claim 1, wherein a box-shaped cooling air passage forming a fifth air passage running in the axial direction is provided on at least one of an upper portion and a lower portion of the stator iron core. A fully-closed fan-type electric motor for a vehicle, characterized in that outside air is circulated in the first ventilation passage and air inside the machine is circulated in the fifth ventilation passage by the inside air fan. 8. The fully-closed external fan electric motor for a vehicle according to claim 7, wherein a heat absorbing fin is provided on an inner wall surface of the fifth ventilation passage.
A fully-closed outer fan electric motor for a vehicle, characterized in that heat radiation fins are provided on the outer wall surface, respectively.