JP2003274609A - Vehicle driving motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle driving motor capable of attaining labor saving for maintenance by preventing generation of fouling in the motor. <P>SOLUTION: This vehicle driving motor comprises a frame, a first bracket engaging with one of both ends of the frame, a second bracket engaging with the other of both the ends of the frame, a cover engaging with the first bracket disposed on an inlet side, a dust discharge port formed on the cover, a plurality of ventilating boards engaging with the first bracket, a discharging port formed on the second bracket and the discharging air, and a main fan provided between the discharging port and a rotor core thereof. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle driving electric motor.

[0002]

2. Description of the Related Art A railroad car has a bogie arranged under the floor of the car. A vehicle drive electric motor is arranged on the dolly. When the vehicle driving electric motor is driven, the rotational force of the vehicle driving electric motor is transmitted to the wheels via the gear device to drive the vehicle. A conventional vehicle driving electric motor will be described in detail with reference to the drawings. FIG. 6 is a sectional view of a conventional vehicle driving electric motor. The conventional vehicle driving electric motor includes a frame 1, a bracket 2, a housing 3, a bearing 4, a bearing 5, a rotor shaft 6, a rotor core 7, and a rotor bar.
8, end ring 9, stator iron core 10, stator coil 11, blower fan 12, detection plate 13, speed sensor 1
4, an air inlet 15, an outlet 16, and a ventilation filter 17. In the vehicle driving electric motor configured in this way, the bracket 2 is attached to one end of the cylindrical frame 1.
Are connected. A housing 3 is connected to the other end of the cylindrical frame 1. The bearing 4 engages with the central portion of the bracket 2. The bearing 5 engages with the central portion of the housing 3. Both ends of the rotor shaft are engaged with the bearing 4 and the bearing 5. Rotor shaft 6
Can rotate freely. The rotor core 7 is connected to the central longitudinal portion of the rotor shaft 6. A large number of grooves are provided on the inner peripheral surface of the rotor iron core 7. Rotor bar 8
Engages with a large number of grooves provided on the inner peripheral surface of the rotor core 7. Both ends of the rotor bar 8 are engaged with the end rings 9. Further, on the inner peripheral surface of the frame 1, the stator core 1
0 is engaged. A large number of grooves are formed on the inner peripheral surface of the stator core. The stator coil 11 engages with a groove formed on the inner peripheral surface of the stator core 10. The coil end portions of the stator coil 11 project on both sides of the stator core 10. The outer peripheral surface of the rotor iron core 7 and the inner peripheral surface of the stator iron core 10 are not in contact with each other, and a gap is formed so as to maintain a constant distance. The drive-side end 6a of the rotor shaft projects outside the frame, and a joint for engaging with a gear device (not shown) is connected to this portion. A ventilation fan 12 is fixed to the drive side of the rotor shaft 6. The detection plate 13 has an end 6b on the side opposite to the drive side of the rotor shaft.
Is engaged with the outer peripheral portion of. The speed sensor 14 is engaged with the frame 1 at a fixed distance from the detection plate 13. An inlet port 15 is provided on the upper portion of the frame 1. The bracket 2 is provided with a plurality of exhaust ports 16. The draft filter 17 engages with the air inlet of the frame 1.

In the electric motor for driving a vehicle constructed as described above, since the stator coil 11 and the rotor bar 8 generate heat when the electric motor for driving the vehicle is driven, outside air is made to flow into the electric motor for driving the vehicle, and the stator coil 11 and the rotor bar 8 are introduced. To prevent temperature rise. In the vehicle driving electric motor configured as described above, the blower fan 12 engages with the rotor shaft 6. The seven fan blades 12a are
Engages the blower fan 12. In the vehicle driving electric motor configured as described above, the outside air flows in from the ventilation filter 17 and passes through the air inlet 15. After that, it passes between the rotor core 7 and the rotor bar 8 and between the stator coil 11 and the rotor bar 8. The air that has passed between the rotor core 7 and the rotor bar 8 is discharged by the ventilation fan 12 to the outside of the vehicle driving electric motor through the exhaust port 16. In the vehicle driving electric motor thus configured, when the outside air flows into the vehicle driving electric motor, it first passes through the draft filter 17. Foreign matter such as dust is removed from the outside air by the filter 17a of the ventilation filter 17. Therefore, it is possible to prevent foreign matter such as dust and the like from entering the vehicle driving electric motor.

[0004]

However, the filter 1
Since the foreign matter such as dust is removed from the outside air by the 7a, the filter 17a must be frequently replaced and maintained. Further, when the filter 17a is used for a long time without being replaced, the filter 17a is clogged and the cooling efficiency is lowered. When the cooling efficiency is lowered, the temperature inside the electric motor for driving the vehicle is likely to rise, resulting in damage to the equipment and shortening of the life of the equipment. Also,
In order to prevent clogging of the filter 17a, a method of changing the mesh of the filter 17a to a coarse one can be considered. However, if the filter 17a has a coarse mesh, outside air mixed with foreign matter such as dust or dust flows into the vehicle driving electric motor. When the outside air mixed with foreign matter such as dust and dust flows into the vehicle drive motor, foreign matter such as dust and dust accumulates in the space between the rotor core 7 and the rotor bar 8 and the ventilation volume is reduced and the heat dissipation is reduced. Happens. Therefore, even in the method of making the filter 17a coarse, the vehicle driving electric motor must be frequently maintained. Therefore, the vehicle drive electric motor is urgently required to extend the maintenance cycle.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electric motor for driving a vehicle, which can prevent the inside of the electric motor from being contaminated and save the labor of maintenance without using a ventilation filter.

[0006]

A motor for driving a vehicle according to the present invention comprises a cylindrical frame, a stator core provided on an inner peripheral surface of a central portion of the frame in the axial direction, and an inner periphery of the stator core. A plurality of axial first groove groups provided in the portion, a stator coil engaging with the first groove groups, a first bracket engaging with one end of both ends of the frame, Second engaging with the other end of the frame
Bracket, a bearing that engages with the first bracket and the second bracket, a rotor shaft that is rotatably supported by the bearing, and a rotor core that is installed in the axial center of the rotor shaft. In a vehicle driving electric motor including a plurality of axial second groove groups provided on the outer peripheral surface of the rotor core and a rotor bar engaging with the second groove groups, the vehicle drive electric motor is disposed on the intake side. And a cover that engages with the first bracket, an outside air inlet air passage that is a space surrounded by the cover and the first bracket, and an outside air intake that is an opening portion provided at the center of the cover. A plurality of air inlets provided in the first bracket that communicates the outside air entering airway with the inside of the vehicle driving electric motor, a dust outlet provided in the cover, and the inside of the outside air entering airway. B A plurality of air-conditioning plates radially arranged around the shaft, a discharge port for discharging air provided in the second bracket, and a main fan provided between the discharge port and the rotor core. It is characterized by

The vehicle driving electric motor of the present invention includes a cylindrical stator, a rotor arranged with a certain clearance from the stator, a bracket engaging with both ends of the stator, and the bracket. In a vehicle driving electric motor including a bearing that rotatably supports the rotor, a substantially circular cover that engages with the one bracket, and an outside air intake port that is a gap between the cover and the one bracket. And a dust outlet provided on the outer periphery of the cover, a plurality of inlets provided in the one bracket for taking in the outside air flowing in from the outside air inlet, and the above-mentioned for discharging the outside air. A discharge port provided on the other bracket, a main fan that is engaged with the rotor and is provided inside the discharge port side machine, and a supplementary fan that is engaged with the rotor and is provided outside the intake port side machine. Characterized in that it comprises a fan. The vehicle driving electric motor of the present invention includes a cylindrical frame, a stator iron core provided on an inner peripheral surface of a central portion of the frame in the axial direction, and a plurality of axial directions provided on an inner peripheral portion of the stator iron core. A first groove group, a stator coil that engages with the first groove group, a first bracket that engages with one end of both ends of the frame, and the other end of both ends of the frame. A second bracket that engages with the bearing, a bearing that engages with the first bracket and the second bracket, a rotor shaft rotatably supported by the bearing, and an axial center portion of the rotor shaft. A rotor driving core, a plurality of axial second groove groups provided on the outer peripheral surface of the rotor core, and a rotor bar that engages with the second groove group.
A cover that engages with the first bracket that is arranged on the intake side, an outside air entry air passage that is a space surrounded by the cover and the first bracket, and an opening portion provided at the center of the cover. An outside air intake port, a plurality of inlet ports provided in the first bracket that communicates the outside air inlet airway with the inside of a vehicle driving electric motor, a dust discharge port provided in the cover, and the outside air. An auxiliary fan provided in the entrance air passage, an exhaust port provided in the second bracket for exhausting air, and a main fan provided between the exhaust port and the rotor core. To do.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) A vehicle driving electric motor according to a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a vehicle driving electric motor of the first embodiment. FIG. 2 is a front view of the vehicle driving electric motor of the first embodiment. In addition, the same components as those in FIG. 6 are denoted by the same reference numerals and the description thereof will be omitted. A vehicle driving electric motor according to a first embodiment of the present invention includes a frame 1, a bracket 2, a bearing 4, a bearing 5, a rotor shaft 6, a rotor core 7, a rotor bar 8, an end ring 9, a stator core 10, and a stator coil 11. , Blower fan 12, detection plate 13, speed sensor 14, air inlet 15,
Exhaust port 16, bracket 18, baffle plate 19, cover 2
0, an outside air inflow air passage 20a, an outside air intake port 21, and a dust discharge port 22. In the vehicle driving electric motor thus configured, the outer peripheral portion of the bracket 18 and the outer peripheral portion of the cover 20 are connected. Bracket 18
, A plurality of air conditioning plates 19 are radially arranged at equal intervals. An air inlet 15 is provided at the center of the cover 18. A dust discharge port 22 is provided at the end of the cover 20. A space surrounded by the bracket 18 and the cover 20 and into which outside air enters is referred to as an outside air entrance air passage 20a.

In the vehicle driving electric motor thus constructed, a plurality of holes are formed in the outer diameter portion of the bracket 18. A plurality of holes formed in the outer diameter portion of the bracket 18 are used as the air inlet 15. Cover 2
The center portion of 0 has a hole, and the cover 20 is a substantially circular iron plate, and has a shape that extends uniformly in the axial longitudinal direction toward the center as the diameter increases. In the vehicle driving electric motor configured as described above, the blower fan 12 also rotates when the vehicle driving electric motor is driven. The blower fan 12 rotates to discharge the air inside the vehicle driving electric motor from the exhaust port 16 and at the same time sucks the outside air into the inside from the outside air intake port 21. The outside air sucked from the outside air intake port 21 flows from the outside air intake port 21 into a space surrounded by the cover 20, the bracket 18, and the baffle plate 19. Of the outside air that has flowed from the space surrounded by the cover 20, the bracket 18, and the baffle plate 19, foreign matter such as heavy dust and dust and a small amount of air are dust provided at the end of the cover 20 due to centrifugal action. It is discharged from the discharge port 22 to the outside of the vehicle driving electric motor. Cover 20, bracket 1
8. Most of the outside air flowing from the space surrounded by the air conditioning plate 19 reverses its direction and flows into the air inlet 15. The air from which foreign matters such as dust and the like that have flowed in from the air inlet 15 are removed flows through the space between the rotor core 7 and the rotor bar 8 and the space between the rotor bar 8 and the stator core 10.

The air flows through the space between the rotor core 7 and the rotor bar 8 and the space between the rotor bar 8 and the stator core 10 to cool the rotor bar 8 and the stator coil 11, which easily generate heat. In the vehicle driving electric motor configured as described above, dust or dust-free air flows in the vehicle driving electric motor. Therefore, the inside of the electric motor for driving the vehicle is less likely to get dirty. Since the inside of the electric motor for driving the vehicle is less likely to be dirty, the maintenance period can be extended. In the vehicle driving electric motor configured as described above, the cooling air is discharged along the inner diameter side of the blower fan 12, so that the hot air that cools the rotor core 7 and the rotor bar 8 hits the vicinity of the bearing 5. There is no. Since the hot air that has cooled the rotor core 7 and the rotor bar 8 does not hit the vicinity of the bearing 5, the temperature rise of the bearing 5 can be prevented as a result. In the vehicle driving electric motor configured as described above, the vehicle driving electric motor that uses the conventional filter 17 also has the filter 1
7 can be removed, and the cover 20 of this embodiment can be modified to the vehicle driving electric motor of this embodiment by fixing only the position of the air inlet 15 of the mounting bracket. By using the vehicle driving electric motor of the present embodiment, it is possible to modify the conventional vehicle driving electric motor and to extend the maintenance period of the conventional vehicle driving electric motor.

(Second Embodiment) Second Embodiment Based on the Present Invention
The vehicle driving electric motor of the embodiment will be described in detail with reference to the drawings. FIG. 3 is a sectional view of a vehicle driving electric motor according to a second embodiment of the present invention. FIG. 4 is a front view of the second embodiment according to the present invention. Those structurally the same as those shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. The electric motor for driving a vehicle according to the present embodiment includes a frame 1, a bracket 2, a bearing 4, a bearing 5, a rotor shaft 6, a rotor iron core 7, a rotor bar 8, an end ring 9, a stator iron core 10, a stator coil 11, and a fan that is a main fan. Fan 12, detection plate 13, speed sensor 1
4, an intake port 15, an exhaust port 16, a bracket 18, a cover 20, an outside air inlet air passage 20a, an outside air intake port 21, a dust discharge port 22, an acceleration fan 23 as an auxiliary fan, and fan blades 24. In the vehicle driving electric motor configured as described above, the blower fan 12 is connected to the rotor shaft 6 by using a tight fit. The blower fan 12 connected to the rotor shaft 6 supports the bearing 4. The acceleration fan 23 engages with the rotor shaft 6 between the bracket 18 and the cover 20. The five fan blades 24 engage with the cover side of the bracket 23.

In the vehicle-driving electric motor constructed as described above, the air volume of the acceleration fan 23 is approximately half that of the blower fan 12. Further, the number of blades of the acceleration fan 23 and the number of blades of the blower fan 12 are different from each other, and the number of blades of the acceleration fan 23 and the blower fan 12 is indivisible. In the electric motor for driving a vehicle configured as described above, the blower fan 1
2, the acceleration fan 23 is driven simultaneously. If the blower fan 12 is driven as the main fan without the acceleration fan 23, the frame 1, bracket 2, bracket 1
Negative pressure is generated in the space surrounded by 8. However, in the vehicle driving electric motor of this embodiment, the acceleration fan 23 is driven as an auxiliary fan, so that the pressure difference between the intake port 15 and the exhaust port 16 is reduced. In the vehicle driving electric motor configured as described above, when the rotor shaft rotates, the blower fan 1
2 and the acceleration fan 18 rotate. The outside air flows in from the outside air intake 21. The outside air swirls rapidly because the cover 20 has a curved shape, but foreign matters such as dust and dust contained in the outside air cannot swirl and are discharged from the dust discharge port to the outside of the machine. The outside air from which foreign matter has been removed flows in through the air inlet port 15 and the space between the rotor core 7 and the rotor bar 8 or
It flows through the space between the rotor bar 8 and the stator coil 11, and reaches the blower fan 12 point. The outside air is discharged from the discharge port 16 to the outside of the machine by the blower fan 12.

In the electric motor for driving a vehicle constructed as described above, the tip end portion of the blade 12a of the blower fan has the outlet 16
The discharge force is higher than that of the conventional electric motor for driving a vehicle, because it is arranged to face. Due to its high ability to discharge outside air,
There is an advantage that heat is not trapped inside the electric motor for driving the vehicle. In the vehicle driving electric motor configured as described above, the cooling air is discharged along the inner diameter side of the blower fan 12, so that the hot air that cools the rotor core 7 and the rotor bar 8 hits the vicinity of the bearing 5. There is no. Since the hot air that has cooled the rotor core 7 and the rotor bar 8 does not hit the vicinity of the bearing 5, the temperature rise of the bearing 5 can be prevented as a result. In the vehicle driving electric motor configured as described above, the acceleration fan 23 is installed outside the bracket 18 (on the drive end side in the longitudinal direction of the rotor shaft). Since the acceleration fan 23 is installed outside the bracket 18, the size of the fan blades 24 can be freely changed. Since the size of the fan blades 24 can be freely changed, even an electric motor that generates a large amount of heat can be sufficiently cooled. Also, in a relatively small vehicle drive electric motor that generates only a small amount of heat,
Noise reduction can be realized by reducing the fan blades.

In the vehicle driving electric motor constructed as described above, the acceleration fan 12 also supports the bearing 4, so that it is no longer necessary to suppress the bearing on the shaft side which is required in the conventional vehicle driving electric motor. Since it is not necessary to use the bearing retainer on the shaft side, the vehicle driving electric motor of the present embodiment can reduce the number of parts. In the vehicle driving electric motor configured as described above, since the number of blades of the blower fan 12 and the number of the acceleration fan 23 are indivisible values, the peak frequency of the sound generated when the fan is rotated is different. Since the peak frequency of the sound generated by the blower fan 12 and the peak frequency of the sound generated by the acceleration fan 23 are different from each other, there is an advantage that the sound is heard by a human being as a result. In the vehicle driving electric motor configured as described above, dust or dust-free air flows in the vehicle driving electric motor. for that reason,
The inside of the motor for driving the vehicle is hard to get dirty. Since the interior of the vehicle drive electric motor is less likely to get dirty, the vehicle drive electric motor of the present embodiment can extend the maintenance period. In the present embodiment, the number of blades of the acceleration fan 23 is 5 and the number of blades of the blower fan 12 is 7, but in the present invention, if the number of blades of the main fan and the auxiliary fan is indivisible. Since it is good, it is not limited to only the combination of 5 and 7.

(Third Embodiment) A vehicle driving electric motor according to a third embodiment of the present invention will be described in detail with reference to the drawings. FIG. 5 is a sectional view of a vehicle driving electric motor according to a third embodiment of the present invention. The same structural elements as those shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. A vehicle driving electric motor according to a third embodiment of the present invention includes a frame 1, a bracket 2, a housing 3, a bearing 4, a bearing 5, a rotor shaft 6, a rotor core 7,
Rotor bar 8, end ring 9, stator iron core 10, stator coil 11, blower fan 12 as a main fan, detection plate 13, speed sensor 14, air inlet 15, exhaust outlet 1
6, bracket 18, cover 20, outside air entry wind passage 20
a, outside air intake 21, dust discharge port 22, acceleration fan 23 as an auxiliary fan, fan blades 24, overhanging portion 25
It is composed by. In the vehicle driving electric motor configured as described above, the frame 1 and the housing 3 are engaged with each other. The frame 1 and the cover 23 are engaged. In the vehicle driving electric motor configured as described above, the frame 1 is provided with the two dust outlets 22 at 180-degree intervals. Further, at the end on the side opposite to the driving end of the frame 1,
A circumferential projecting portion 25 is formed. The frame 1 and the cover 23 are engaged with each other by the circumferential protruding portion 25. The bracket 2 has a plurality of exhaust ports 16 arranged at equal intervals. An outside air intake 21 including a large number of punched holes is provided in the inner diameter portion of the cover.

In the electric motor for driving a vehicle constructed as described above, a plurality of exhaust ports 16 and a plurality of outside air intake ports 21 are provided.
Since it has, it is possible to reduce the material.
Further, since the plurality of exhaust ports 16 and the plurality of outside air intake ports 21 are provided, the intake performance and the exhaust performance of the vehicle driving electric motor can be improved. The material for the vehicle driving electric motor of the present invention is not limited. Further, in the vehicle driving electric motor of the present invention, the bracket and the frame may be integrated.

[0017]

EFFECT OF THE INVENTION It is possible to provide an electric motor for driving a vehicle, which can prevent the inside of the electric motor from being contaminated and can save the labor of maintenance without using a ventilation filter.

[Brief description of drawings]

FIG. 1 is a sectional view of a vehicle driving electric motor according to a first embodiment of the present invention.

FIG. 2 is a front view of the vehicle driving electric motor according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a vehicle driving electric motor according to a second embodiment of the present invention.

FIG. 4 is a front view of a vehicle driving electric motor according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a vehicle driving electric motor according to a third embodiment of the present invention.

FIG. 6 is a sectional view of a conventional vehicle driving electric motor.

[Explanation of symbols]

1-frame 2-bracket 3-housing 4-bearings 5-bearings 6-rotor shaft 7-Rotor core 8-rotor bar 9-end ring 10-stator iron core 11-stator coil 12-Blower fan 13-Detection plate 14-speed sensor 15-air inlet 16-Exhaust port 17-ventilation filter 17a-filter 18-bracket 19-Baffle plate 20-Cover 20a-Open air entry wind passage 21-outside air intake 22-Dust outlet 23-accelerating fan 24-fan blade 25-Overhang

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tadashi Matsuura             No. 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation             Fuchu Office (72) Inventor Shigetomo Shiraishi             No. 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation             Fuchu Office F term (reference) 5H605 AA03 AA05 AA07 BB05 BB10                       CC02 DD07 DD09 DD21 DD31                       DD34 EB10 EB12 EB16                 5H609 BB02 BB12 BB18 PP02 PP06                       PP07 PP08 PP09 QQ02 QQ12                       QQ13 QQ15 RR03 RR07 RR10                       RR11 RR16 RR23 RR27 RR32                       RR38 RR39 RR42 RR44 RR67                       RR69 RR73 SS04 SS12

Claims (5)

[Claims] 1. A cylindrical frame, a stator iron core provided on an inner peripheral surface of a central portion of the frame in the axial direction, and a plurality of first axial members provided on the inner peripheral portion of the stator iron core.
Group of grooves, a stator coil that engages with the first group of grooves, a first bracket that engages with one end of both ends of the frame, and the other end of both ends of the frame A second bracket, a bearing that engages with the first bracket and the second bracket, a rotor shaft that is rotatably supported by the bearing, and a rotor installed at the axial center of the rotor shaft. An iron core and a plurality of axial second members provided on the outer peripheral surface of the rotor iron core.
And a rotor bar engaging the second groove group, a cover engaging the first bracket arranged on the air intake side, the cover and the rotor bar engaging the second groove group. The outside air inlet air passage which is a space surrounded by the first bracket, the outside air intake opening provided at the center of the cover, the outside air inlet air passage and the inside of the vehicle drive motor, and the first bracket A plurality of inlets and outlets provided on the outer periphery of the cover, a plurality of air conditioners radially arranged around the rotor shaft in the outside air inlet air passage, And a main fan provided between the exhaust port and the rotor core, the exhaust port being provided in the bracket for exhausting air, and the main fan provided between the exhaust port and the rotor core. 2. A cylindrical stator, a rotor disposed with a fixed gap between the stator, brackets engaging both ends of the stator, and the rotor being rotatable by engaging the brackets. In a vehicle driving electric motor including a bearing supported on, a substantially circular cover that engages with the one bracket, an outside air intake that is a gap between the cover and the one bracket, and an outer periphery of the cover. A dust outlet provided and a plurality of inlets provided in the one bracket for taking in the outside air flowing from the outside air inlet and an outlet provided in the other bracket for discharging the outside air. And a main fan that is engaged with the rotor and is provided inside the machine on the outlet side, and an auxiliary fan that is engaged with the rotor and is provided outside the machine on the inlet side. Vehicle driving electric motor to be. 3. A cylindrical frame, a stator iron core provided on an inner peripheral surface of a central portion of the frame in the axial direction, and a plurality of first axial members provided on the inner peripheral portion of the stator iron core.
Group of grooves, a stator coil that engages with the first group of grooves, a first bracket that engages with one end of both ends of the frame, and the other end of both ends of the frame A second bracket, a bearing that engages with the first bracket and the second bracket, a rotor shaft that is rotatably supported by the bearing, and a rotor installed at the axial center of the rotor shaft. An iron core and a plurality of axial second members provided on the outer peripheral surface of the rotor iron core.
And a rotor bar engaging the second groove group, a cover engaging the first bracket arranged on the air intake side, the cover and the rotor bar engaging the second groove group. The outside air approaching air passage which is a space surrounded by the bracket 1, the outside air intake opening which is an opening portion provided at the center of the cover, and the first outside air passage which communicates with the inside of the vehicle driving electric motor. A plurality of air inlets provided in one bracket, a dust outlet provided in the cover, an auxiliary fan provided in the outside air inlet air passage, and an air provided in the second bracket. An exhaust port, a main fan provided between the exhaust port and the rotor core,
An electric motor for driving a vehicle, comprising: 4. The vehicle drive electric motor according to claim 2 or 3, wherein the ventilation capacity of the main fan is larger than the ventilation capacity of the auxiliary fan. 5. The vehicle driving electric motor according to claim 2, wherein the number of blades of the main fan and the number of blades of the auxiliary fan are indivisible. An electric motor for driving a vehicle.