JPH11356011A - Totally-enclosed main motor for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a totally-enclosed main motor for a vehicle which enables miniaturizing, the weight reduction and the rating increase without increasing the frequency of maintenance/inspection. SOLUTION: Ventilation holes 6a and 6b are formed on both the sides of the upper part on a wheel shaft 3 side of the bottomed cylindrical outer cylinder frame 6A of a main motor 1A. Connection parts of both the ends of a cooler are fixed to the upper surface of the outer cylinder frame 6A with bolts 23A. An air duct 20 is connected between the connection parts by welding. Heat absorbing fins 21 are welded to the inner side of the air duct 20 in a direction in parallel with a rotor axis. Heat radiation fins 22 are welded to the outer circumference of the air duct 20 in a direction perpendicular to the rotor axis. As no obstacle exists between the radiation fins 22, dusts do not deposit on the surfaces of the radiation fins 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fully closed main motor for a vehicle.

[0002]

2. Description of the Related Art In a main motor mounted on a bogie frame under a floor of a railway vehicle, a ventilation fan is conventionally inserted into an end of a rotor shaft of the main motor, and the ventilation fan rotates with the rotation of the main motor. An open-type main motor that blows air outside the main motor into the inside and circulates through the inside to cool a rotor and the like is employed.

[0003] On the other hand, in order to meet the demand for labor-saving maintenance and low noise, a fully-closed main motor in which a cooling fan is incorporated has been developed. This fully-closed main motor shuts off the inside of the main motor from the outside to prevent dust from entering the interior together with the outside air, prevent the internal windings from being contaminated by the dust, and reduce the frequency of maintenance and inspection due to the contamination. Can be prevented from increasing.

Further, by adopting a fully closed structure, it is possible to prevent the noise generated by the rotation of the internal cooling fan from dissipating, thereby providing an environmentally friendly main motor. On the other hand, for main motors for vehicles, large capacity is required as train speeds increase,
The mounting location is required to be installed in a narrow space where the bogie frame of the vehicle is limited, and the above-mentioned high-speed train requires a small size and light weight.

In order to respond to the conflicting demands, the heat resistance of the insulating resin of the winding has been improved. However, in order to prevent the deterioration of the insulating resin of the winding and extend the service life. Improvement of the cooling performance of the main motor is an essential condition. In view of this, the inventors have disclosed in Japanese Patent Application Laid-Open No. 9-205758 a fully-closed main motor for a vehicle in which the cooling performance is improved.

FIG. 5 is a side view of a prototype of a fully-closed main motor for a vehicle in which the present inventors have further improved the cooling performance by further improving the fully-closed main motor for a vehicle. FIG. The cross-sectional view is substantially the same as that of the fully-closed main motor for a vehicle shown in FIGS. 1 to 6 of JP-A-9-205758, except that the number of ventilation pipes is different.

More specifically, in FIGS. 5 and 6, the main motor 1 is located on the right side and the left side (not shown) of the middle frame 2a of the center portion of the H-shaped bogie frame 2 in a plan view (not shown), which is the framework of the bogie.
A pair of mounting portions 2b for mounting C and a mounting portion of a gear box (not shown) are symmetrically welded.

On the left and right sides of the bogie frame 2, unillustrated wheel axle boxes are provided symmetrically via coil springs (not shown), and both ends of the axle 3 pass through these unillustrated bearings through bearings (not shown). Has been inserted. These axles 3 have wheels 3a
Are symmetrically press-fitted by shrink fitting.

A main motor 1 is provided between the axle 3 and the mounting portion 2b.
C is mounted, and the main motor 1C is
Upper mounting seat 1 protruding from one side of the outer frame as shown in FIG.
a and the lower mounting seat 1c, and is fixed above and below the mounting portion 2b with bolts 23B.

One side 12a of the rotor shaft 12 of the main motor 1C is connected to one side of the shaft of the gear box by a flexible coupling (not shown). In FIG. 5, a rail 5 of a track on which the vehicle travels is indicated by a dashed line below the wheel 3a.

In FIGS. 5 and 6, the left side in FIG. 6, which is the opening side of the outer cylinder frame 6 formed into a bottomed cylindrical shape from mild steel, has an outer periphery of an annular side frame 8 in a left side view (not shown). The fitting part formed on the right side is inserted and fixed with a plurality of bolts.

The base end of the upper mounting seat 1a is welded to the left side of the outer cylinder frame 6 in FIG. 5, and the hook 1b is also welded to the right side of the outer cylinder frame 6. A hook hole for hanging is formed in each of the upper mounting seat 1a and the hook 1b. The outer cylinder frame 6 has an outer cylinder frame 6
Symmetrically shows a pair of thick legs 1d whose upper ends are welded.

A roller bearing 10 is inserted into a bearing hole shown in FIG. 6 formed at the center of the side frame 8, and an outer ring of the roller bearing 10 is fixed to an outer surface of a center portion of the side frame 8 by bolts. It is fixed from the outside at the fitting portion of the bearing retainer 8a. Roller bearing 10
The inner ring is fixed to the rotor shaft 12 by a fixed ring inserted into a rotor shaft 12 to be described later inside and outside the inner ring.

A fitting portion formed on the outer surface side of the bearing plate 9 is inserted into the fitting hole formed at the center of the right end of the outer cylinder frame 6 from the inside of the outer cylinder frame 6, and is inserted from the inside. It is fixed to the outer cylinder frame 6 by a plurality of bolts (not shown).

A bearing hole formed in the center of the bearing plate 9 includes:
A ball bearing 11 is inserted, and the outer ring of the ball bearing 11 is
The fitting portion is inserted from the outside and is fixed to the bearing plate 9 by a bearing retainer 9a fixed from the outside with a bolt (not shown).

The left and right roller bearings 10 and ball bearings 11 are
Pre-pressed into 12 FIG. 6 of this rotor shaft 12
At the right end, a cylindrical portion of a detection gear (not shown) having gear-shaped grooves formed at equal intervals on the outer periphery is press-fitted and fixed.

A detection cover (not shown) having a U-shaped cross section is fixed to the outer cylinder frame 6 on the outer periphery of the detection gear, and a pulse detector for detecting the rotation speed of the rotor shaft 12 is provided at the upper end of the detection cover. , And the tip of the detection unit is opposed to the outer periphery of the detection gear with a small gap.

A rotor core 13 is press-fitted into the center of the rotor shaft 12, and an annular core presser 13c formed from a thick plate is press-fitted into the left end of the rotor core 13. An iron core retainer 13a having an L-shaped cross section is press-fitted also at the right end. An inner fan 14 is press-fitted on the left side of the left iron core presser 13a.

A plurality of ventilation holes 13b are formed in the rotor core 13 in a ring shape. A rotor bar 13d is shown on the inner peripheral side of the rotor core 13, and end rings are shown at both ends of the rotor bar 13d. Have been.

On the other hand, the stator core 7
Is press-fitted into the center portion, and on the inner peripheral side of the stator core 7,
A stator coil 7a inserted into a slot (not shown) and having both ends protruding left and right of the stator core 7 is shown. As a result, the main motor is a cage-shaped induction motor.

At the upper end of the outer frame 6 in FIG. 6, left and right vent holes 6a and 6b in plan view (not shown) are provided.
Is formed on the upper right side. In these vents 6a and 6b, the lower end is opened in FIG.
Flanges formed at the open ends of the bottomed cylindrical connecting portions 15A and 15B serving as entrances and exits of C are fixed to the outer cylinder frame 6 with bolts 23C.

On the opposite sides of the left and right connecting parts 15A and 15B, nine ventilation pipes 16 shown in FIG.
Are penetrated and welded to the connection portions 15A and 15B.
These ventilation pipes 16 pass through a plurality of cooling fins 17 which are manufactured from a thin aluminum plate as shown in FIG. Each cooling fin 17 is connected to each ventilation pipe 16
The lower end is opposed to the upper surface of the outer cylinder frame 6 with a slight gap.

In the thus-configured fully-closed main motor for a vehicle, when the train is running, the inner fan 14 also rotates by the rotation of the rotor shaft 12, and the cooling air discharged from the inner fan 14 As indicated by arrows G1 and G2, arrows G3 are provided from the vent 6a of the outer cylinder frame 6 to the connection portion 15A of the cooler 1C.
And flows through the inside of each ventilation pipe 16 from this connection portion 15A as shown by the arrow, and flows out to the right connection portion 15B.

The cooling air flows from the right connecting portion 15B through the vent 6b as shown by arrows G4 and G5.
Flows into the interior. Then, as shown by an arrow G6, a part of the cooling air flows between the inner circumference of the stator core 7 and the rotor core.
The air is sucked into the inner fan 14 through the gap formed between the outer circumferences of the 13.

Another part of the cooling air flowing into the right side of the outer cylindrical frame 6 flows through the ventilation hole 13b formed in the rotor core 13 to the left as shown by an arrow G6. Similarly,
It is sucked into the inner fan 14, and is hereinafter referred to as G1-G2-G3-G4-G5
Reflux with G6-G7.

Accordingly, in the thus-configured fully-closed main motor for a vehicle, the recirculating cooling air causes the stator core 7 and the stator coil 7a and the rotor core to rotate.
The stator coil 7a and the rotor bar 13d, whose rotor 13 and the rotor bar 13d are cooled and insulated from the iron core with epoxy resin, can maintain the insulation characteristics between the stator core 7 and the rotor core 13. Further, since no cooling air is taken in from outside, it is possible to prevent dust from adhering and accumulating, and to prevent an increase in the frequency of maintenance and inspection.

In the fully-closed main motor for a vehicle configured as described above, when the fully-closed main motor for a vehicle is incorporated into a bogie, the lower portion is gradually lowered from above the bogie in a state before the vehicle body is mounted on the bogie. Is mounted on the upper end of the mounting portion 2b of the bogie frame 2 via a key, and the upper mounting seat 1a and the lower mounting seat 1c are fixed to the mounting portion 2b with bolts 23B.

When the vehicle is to be inspected for periodic inspection, the bogie is separated from the vehicle body, the bolts 23B are loosened, and the bogies are lifted upward using the hook holes.

The fully closed main motor for a vehicle is shown in FIG.
In the mounting state shown by, the space is between the left mounting portion 2b and the case of the right axle 3, the axial direction is between the two axles 3, and the lower end surface of the vehicle body 4 shown in FIG. Are opposed to each other, and the lower side is opposed to the rail 5 with the height limit H of FIG.
It is installed in a limited space where there is no room.

[0030]

However, in a fully-closed main motor for a vehicle configured as described above, since outside air is not taken in, it is necessary to prevent dust that enters with the outside air from adhering to the internal windings and the like. However, dust that has been wound up from the track due to traveling over a long distance adheres to the surfaces of the cooling fins 17 and the ventilation pipes 16.

Then, the cooling performance of the cooler 1C of the prototype having the increased number of the ventilation pipes 16 is reduced.
The dust adhering to the surface of the ventilation pipe 16 must be blown off by blowing compressed air or the like.

However, in this cleaning method, since the nozzle must be inserted into a narrow place below the floor of the vehicle body, the workability is poor, and the compression blown to the inner ventilation pipe 16 and the cooling fins 17 on the outer periphery of the ventilation pipe 16 is not performed. It takes time due to a decrease in the flow velocity of the air, and it may not be possible to completely blow it off.

For this reason, the above-mentioned Japanese Patent Application Laid-Open No. 9-20575
As shown in FIG. 4 of No. 8, it is conceivable to increase the cooling capacity by adding a small cooler also to the lower right part of the outer cylinder frame 6 in FIG. 6, but since this place is narrow, the ventilation pipe 16 Is limited to about two.

A method of removing the bogie from the vehicle is also conceivable, but it takes time to remove and mount the bogie. Accordingly, an object of the present invention is to provide a fully-closed main motor for a vehicle that can be reduced in size and weight and increase the rating without increasing the frequency of maintenance and inspection.

[0035]

According to a first aspect of the present invention, there is provided a fully-closed main motor for a vehicle in which a stator core is inserted into an inner periphery of a cylindrical portion and openings are formed on both axial sides of the cylindrical portion. A stator frame formed; a cooler in which fins are protrudingly provided on the inner and outer circumferences of the ventilation pipe having both ends communicating with the opening of the stator frame; and a direction perpendicular to the running direction of the vehicle on the axis of the stator frame. And a rotor having a stator core inserted at an intermediate portion of a stator shaft penetrating the rotor and an inner fan inserted at one side.

In particular, a fully closed main motor for a vehicle according to the invention according to claim 2 is characterized in that a cooler is provided on an axle side above or below a stator frame. In particular, the fully closed main motor for a vehicle according to the third aspect of the present invention has the fin on the inner periphery of the ventilation pipe in a direction parallel to the rotor axis and the fin on the outer periphery of the ventilation pipe in a direction perpendicular to the rotor axis. It is characterized by.

Further, the fully closed main motor for a vehicle according to the invention according to claim 4 is characterized in that the cooler is made of an aluminum material. By such means, in the present invention, fins are formed on the inner and outer peripheries of the ventilation pipe so that the cooling air has a laminar flow, thereby preventing dust from adhering and increasing heat transfer efficiency.

[0038]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fully closed main motor for a vehicle according to the present invention will be described below with reference to the drawings. FIG.
FIG. 1 is a partial longitudinal cross-sectional enlarged view in a direction perpendicular to an axis showing a first embodiment of a fully-closed main motor for a vehicle according to the present invention, corresponding to FIG. FIG. 7 is a partial cross-sectional view in a direction parallel to FIG. 6 and corresponds to FIG. 6 shown in the related art.

FIGS. 1 and 2 are different from FIGS. 5 and 6 described above in the structure of the cooler, and are otherwise the same as FIGS. 5 and 6 shown in the prior art. Therefore,
Only the cooler described below and the path of the cooling air flowing through the cooler are shown in an enlarged view, and the rotor shaft and the like are omitted.

That is, all the coolers 1A mounted on the upper surface of the outer frame 6 are made of aluminum alloy plates (A6061).
PT-T6), and as shown in FIG. 1, a wind path 20 that is bent into a flat hexagonal shape having an asymmetrical cross section in the direction perpendicular to the axial direction of the electric motor and has a tubular shape. Connecting portions 19A and 19B which are joined to both ends of the path 20 and have a flange formed on the opening side at the lower end, heat absorbing fins 21 arranged at equal intervals on the inner circumference of the wind path 20, and the outer circumference of the wind path 20 It is composed of radiation fins 22 arranged at intervals.

The air passage 20 and the radiating fins 22 are shown in FIG.
1 are substantially similar to each other in the cross-sectional view, and the upper end surfaces of the left side of the wind path 20 and the left side of the radiating fin 22 in FIG. 1 are parallel to the lower surface of the vehicle floor. The left and right ends are almost vertical.

The upper right side and lower left side of the wind path 20 are parallel to each other at about 37 ° with respect to the vehicle floor. The heat absorbing fins 21 are trapezoidal strips having the bottom surface on the inner surface side of the wind path 20, as shown in FIG. 2, and are parallel to the axle.

Each corner of the radiating fin 22 is chamfered in an arc shape as shown in FIG. 1, and a corner of a cut portion on the outer periphery is slightly chamfered. Similarly, each corner of the wind path 20 in FIG. 1 is also bent in an arc shape except for the left and right ends, and the cut surface at the end of the heat absorbing fin 21 is slightly chamfered.

In the fully-closed main motor for a vehicle in which the cooler 1A is configured as described above, the traveling wind generated as shown by an arrow A0 when the vehicle travels rightward in FIG. As shown by an arrow A1, the air flow is divided up and down at the right end of the wind path 20.

Of these, the traveling wind passing above the wind path 20 flows down between the upper portions of the radiation fins 22, and flows through the rear side of the vehicle as shown by an arrow A3. Also, as shown by an arrow A2 in the lower part of the wind path 20, an arrow A
As shown by 2, the traveling wind also flows down to the rear side of the vehicle.

In this process, the radiation fins 22 and the wind path 20
Is transmitted to and absorbed by the traveling wind. When the vehicle travels leftward in FIG. 1, the radiating fins 22 of the cooler 1A are also exposed to the traveling wind flowing in the direction indicated by the broken arrow A4.
Is cooled.

On the other hand, the cooling air discharged by the rotation of the inner fan 14 as shown by the arrow B1 in FIG. 2 and sent from the ventilation port 6a to the left connecting portion 19A as shown by the arrow B2 is
As shown in FIG. 3, the inside of the wind path 20 flows down to the right side, and an arrow B4
As shown in the figure, it flows down to the right connecting portion 19B.

The cooling air flows into the outer frame 6 from the right vent 6b as shown by the arrow B5, and a part of the cooling air is sucked into the inner fan 14 through the ventilation hole 13b as shown by the arrow B6. You. Further, other cooling air flows down the gap formed between the stator 7 and the rotor 13 and is similarly drawn into the inner fan 14 and thereafter circulates.

In the course of the circulation of the cooling air, the cooling air is heated by the stator 7 and the rotor 13 and flows into the air passage 20 and flows therethrough.
Cooling air flowing out of the air passage 20 is cooled by heat absorbing fins 21 protruding into the air passage 20, and this heat is transmitted to the air passage 20 and the radiation fins 22.

In a fully-closed main motor for a vehicle incorporating the above-structured cooler, an arrow A1 in FIG.
As indicated by A2 and A3, the traveling wind flowing down the cooler 1A is arranged in parallel with the traveling direction and has a large radiating fin having a large total area.
By 22, turbulence is generated, that is, vortex is not generated, so that dust is adhered to the surface of the wind path 20 and the radiation fins 22.

On the other hand, the cooling air discharged from the inner fan 14 also
The airway passes through a ventilation port 6a having a large cross section formed in the outer frame 6.
20 and flows between the heat absorbing plates 21 projecting in parallel to the inner surface of the wind path 20 in the axial direction to form a large heat dissipating area without generating a vortex. Can be raised.

Further, in the case where compressed air is blown by the nozzle in the periodic inspection, the radiation fins 22 on the outer periphery of the cooler are also used.
Since there is no obstacle between them, such as the conventional ventilation pipe 16 shown in FIG. 5, dust adhering to the radiation fins 22 can be easily removed. In the above embodiment, the aspect ratio of the cross section of the cooler 1A may be determined according to the storage space under the floor which varies depending on the vehicle.

Next, FIG. 3 is a partial longitudinal sectional view in a direction perpendicular to an axis, showing a second embodiment of the fully-closed main motor for a vehicle according to the present invention, which is shown in FIG. 1 shown in the first embodiment. Corresponding, outer frame 6
Only the lower part of is shown.

FIG. 4 is a partial sectional view in the direction parallel to the axis, corresponding to FIG. 2 of the first embodiment, and shows only the lower portion of the outer frame 6 as in FIG. 3 and 4, the outer frame 6
3, a substantially U-shaped wind path 25 in FIG. 3 and an inverted convex air path 25 in FIG. 4 are fixed by bolts.

For this reason, a vent 6c is formed at the lower part of the outer frame 6 at the right side from the center in FIG. 3, and at the left end in FIG. 4, and at the left side from the center in FIG. The ventilation port 6d is formed symmetrically with respect to the right end. A trapezoidal heat absorbing fin 26 in FIG. 4 is welded to the inner surface of the air passage 25, and a U-shaped heat radiation fin 24 in FIG.

The cooler 1B thus configured is mounted on the outer frame 6
In the fully closed main motor for vehicles,
The traveling wind flowing under the cooler 1B as shown by the arrow C1 in FIG. 3 due to the running of the vehicle passes between the heat radiation fins 24 as shown by the arrow C2 in FIG. 3, and is shown by the arrow C3 in FIG. Flow through like so.

The traveling direction of the vehicle is reversed, and the traveling wind flowing from the left side to the right side as shown by the dashed arrow C4 in FIG. Flow through as shown.

On the other hand, the cooling air discharged as shown by the arrow D1 in FIG. 4 by the rotation of the inner fan 14 flows from the vent 6c formed in the outer cylinder frame into the air passage 25 as shown by the arrow D2. After flowing into the air passage 20 to the right as shown by the arrow D3, it flows into the outer cylindrical frame 6 from the right vent 6d as shown by the arrow D4.

This cooling air flows through the air gap between the stator and the rotor and the ventilation hole of the rotor to the left in the same manner as the arrow B6 in FIG. As shown in D6, the heat is sucked into the inner fan 14, and thereafter circulates through the inside of the cooler and the outer cylinder frame in the same manner to transfer the heat of the rotor and the stator to the cooler.

In the fully-closed main motor for a vehicle having the above-described cooler, the space between the lower portion of the outer cylinder frame 6 and the foot 1d is used to form the air passage 25 in the sectional view of FIG. The cooling effect of the electric motor is obtained by obtaining a wide flow path cross-sectional area and sharing with the coolers of FIGS. 1 and 2 shown in the first embodiment while maintaining the limited height H with the rail 5. Can be further increased.

[0061]

As described above, according to the present invention, the stator core is inserted into the inner periphery of the cylindrical portion and the opening is formed on both sides of the cylindrical portion in the axial direction. A fin is provided on the inner and outer circumferences of a ventilation pipe with both ends communicating with each other, and a rotor shaft inserted into the middle part and an inner fan inserted into one side is mounted on the axis of the stator frame in the running direction of the vehicle. Fins that form laminar flow of cooling air on the inner and outer peripheries of the ventilation pipe to prevent dust from adhering and increase heat transfer efficiency, thus increasing the frequency of maintenance and inspection. Thus, a fully-closed main motor for a vehicle which can be reduced in size and weight and can be increased in rating can be obtained.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view in a direction orthogonal to an axial direction showing a first embodiment of a fully-closed main motor for a vehicle according to the present invention.

FIG. 2 is a partial longitudinal sectional view in a direction parallel to an axial direction showing a first embodiment of the fully-closed main motor for a vehicle according to the present invention.

FIG. 3 is a partial longitudinal sectional view in a direction perpendicular to an axial direction, showing a second embodiment of the fully-closed main motor for a vehicle according to the present invention.

FIG. 4 is a partial longitudinal sectional view in a direction parallel to an axial direction showing a second embodiment of the fully closed main motor for a vehicle according to the present invention.

FIG. 5 is a side view showing an example of a conventional fully closed main motor for a vehicle.

FIG. 6 is a sectional view taken along line EE of FIG. 5;

[Explanation of symbols]

1A, 1B, 1C: Main motor, 2: Bogie frame, 3: Axle,
4 ... body, 5 ... rail, 6A, 6B ... outer cylinder frame, 6a, 6
b, 6c, 6d: vent, 7: stator, 8: side frame, 9 ...
Bearing plate, 10: roller bearing, 11: ball bearing, 12: rotor shaft, 13
... rotor, 14 ... inner fan, 15A, 15B, 19A, 19B ... connection part, 20, 25 ... airway, 21, 26 ... heat absorption fin, 22, 24 ... heat radiation fin, 23A, 23B, 23C ... hexagon bolt.

Continued on the front page (72) Inventor Kazunori Yamawaki 2-24-24 Harumi-cho, Fuchu-shi, Tokyo Toshiba Transport Engineering Co., Ltd. In-house (72) Inventor Tsuyoshi Kinoshita 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the factory (72) Inventor Tadashi Matsuura 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Fuchu factory, Toshiba Corporation

Claims (4)

[Claims] 1. A stator frame in which a stator core is inserted into an inner periphery of a cylindrical portion and openings are formed on both sides in an axial direction of the cylindrical portion, and both ends of the stator frame are formed in the opening portion. A cooler in which fins protrude from the inner and outer peripheries of the communicating vent pipes, and a stator core inserted in an intermediate portion of a stator shaft penetrating through the axis of the stator frame in a direction orthogonal to the traveling direction of the vehicle. And a rotor having an inner fan inserted on one side. 2. The fully-closed main motor for a vehicle according to claim 1, wherein the cooler is provided on an axle side or a lower part of an upper part of the stator frame. 3. The fin on the inner circumference of the ventilation pipe is parallel to the rotor axis, and the fin on the outer circumference of the ventilation pipe is orthogonal to the rotor axis. Or a fully-closed main motor for vehicles according to claim 2. 4. A fully-closed main motor for a vehicle according to claim 1, wherein said cooler is made of an aluminum material.