JPH09233766A - Wheel integrated type motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool respective parts in a motor effectively and increase output of motor by increasing draft amount. SOLUTION: In this motor, which is of outer rotor type, a wheel 5 is supported at one end part of a shaft 1 through a bearing 4 so that it may rotate freely, and a stator iron core 6 is fitted onto the wheel 1 at the inner position of the wheel 5 through a stator member 60. A rotor frame 8 is disposed with a prescribed clearance at an external circumferential surface. An end part on wheel side is connected integrally with the wheel 1, and an end part on opposite wheel side is supported by a bearing 10 so that it may rotate freely. A cooling air duct 18 is supported outside the bearing 10 of the opposite wheel side by the stator member 60, and a plurality of first ventilating holes 6b which are communicated with the motor at the inner circumferential part and the stator member 60 are fitted respectively. The second ventilating holes 19a, 19b which are communicated with the motor at the end surface of the rotor frame 8 and the external circumferential part of the cooling air duct 18 are fitted respectively, and cooling air which is introduced from the upper part of the cooling air duct 18 is distributed into the motor through the first and second ventilating holes 6b, 19a, 19b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer rotor type wheel-integrated electric motor used in railway vehicles and the like.

[0002]

2. Description of the Related Art In a conventional railway vehicle drive structure, a large gear is attached to an axle that is integrated with wheels, and a main motor (hereinafter referred to as a motor) is attached to a shaft of a small gear that is meshed with the large gear. Is connected to a rotary shaft of the motor and the rotational force of the motor is transmitted to the wheels via a gear mechanism to drive the wheels.

In recent years, in order to speed up the vehicle by improving running characteristics, reduce noise by eliminating the gear mechanism, and save labor in maintenance, etc., each wheel drive system of a wheel / motor integrated type as shown in FIG. Is being developed.

In FIG. 5, reference numeral 1 denotes an axle that does not rotate, and both ends of the axle 1 are fixedly supported by a bogie frame 3 via an axle support box 2. Wheels 5 traveling on rails are rotatably supported at both sides of the axle 1 via bearings 4. A stator core 6 having a stator coil 7 is attached at a predetermined position inside the axle 1 via a stator member 6a.

Further, a bracket 11 having a plurality of exhaust ports 16 is mounted inside the wheel 5, and one end of a cylindrical rotor frame 8 having a permanent magnet 9 on the inner peripheral side is fixed to the other end. The other end of the rotor frame 8 is rotatably supported by a bearing 10 attached to the stator member.

The outer peripheral surface of the stator core 6 and the permanent magnet 9
There is a gap of about 2 mm between the inner surface of the and. On the other hand, as shown in FIG. 6, a cooling air duct 13 having an outer diameter larger than that of the rotor frame 8 is provided outside the bearing 10 on the side opposite to the wheels of the motor, and is fixed to the stator member 6a by mounting bolts 17. ing.

The cooling air duct 13 is provided with ventilation holes 15b corresponding to a plurality of ventilation holes 15a provided in the stator member 6a located on the outer peripheral portion of the axle 1, and these ventilation holes 15a, 15b are provided. The inside of the cooling air duct communicates with the inside of the motor machine. In addition, the cooling air duct 13
An opening 13a is provided in the upper part of the opening 13a.
In addition, it is connected to the air supply duct of the cooling blower through the flexible air passage 14 made of bellows.

Also, the lead wire 12 connected to the coil 7
Is drawn into the cooling air duct 13 through the ventilation holes 15a provided in the stator member 6a and the ventilation holes 15b provided in the cooling air duct 13, and then the cooling air duct 13
Is drawn from above.

The bracket 11 and the rotor frame 8 form a rotating portion integrally with the wheel 5 and constitute an outer rotor type wheel-integrated permanent magnet type synchronous motor. Although not shown, a drive motor having the same structure is attached to the opposite wheel.

[0010]

In the wheel-integrated motor having such a structure, the cooling air sent from the blower is introduced into the cooling air duct 13, and then the cooling air duct 1 is introduced.
3 and the stator member 6a through the ventilation holes 15b and 15a to enter the machine. And the cooling air that has flowed into this machine is
It is provided on the stator core 6 and the stator member 6a at the same time as it passes through the gap formed between the outer peripheral surface of the stator core 6 and the inner peripheral surface of the permanent magnet 9 attached to the rotor frame 8. The structure is such that the air passes through the ventilation hole 15a penetrating in the axial direction and is exhausted to the outside of the machine through the exhaust port 16 provided in the bracket 11.

However, the wheel-integrated motor having such a structure has the following problems, and an improvement is desired. (1) Since the cooling air taken into the machine is introduced from the cooling air duct 13 through the plurality of ventilation holes 15a provided in the stator member 6a on the inner peripheral side of the axle, most of the cooling air is stator. A void portion having a large ventilation resistance, which passes through the ventilation hole 6b provided in the iron core 6 and the stator member 6a and penetrates in the axial direction and exists between the outer peripheral surface of the stator core 6 and the inner peripheral surface of the permanent magnet 9. Hardly flows to. For this reason, the cooling efficiency of the stator coil 7 and the permanent magnet 9 which are heating elements is reduced.

Further, if the ventilation holes 6b of the stator core 6 and the stator member 6a are closed, the amount of ventilation to the gap side between the stator core 6 and the permanent magnet 9 acts in the direction of increasing. In addition, the ventilation resistance inside the machine increases and the amount of air taken into the machine decreases, which does not lead to an increase in the amount of ventilation to the void side. (2) On the other hand, the bearing 10 that supports the rotor frame 8 has a large diameter and is likely to generate heat. However, cooling is performed effectively because the intake of cooling air into the machine is on the inner diameter side of the bearing 10. The temperature rises easily.

The present invention has been made in order to solve the above-mentioned problems, and can effectively cool the various parts inside the machine and increase the output of the motor due to the increase in the amount of ventilation so that it is within the vehicle limit. It is an object of the present invention to provide a vehicle-integrated electric motor capable of facilitating the above-mentioned configuration and improving vehicle performance.

[0014]

In order to solve the above-mentioned object, the present invention constitutes a wheel-integrated rotary electric machine by the following means. In the invention corresponding to claim 1, a wheel is rotatably supported via a bearing at one end of an axle fixedly supported by a bogie, and a stator is attached to an axle at an inner position of the wheel. The rotor is mounted on the inner peripheral surface of the rotor frame, which is arranged with a predetermined gap on the outer peripheral surface, and the wheel-side end of the rotor frame is integrally connected to the wheel by a bracket to rotate the rotor. In an outer rotor type wheel-integrated electric motor in which an end portion of a child frame on the side opposite to the wheel is rotatably supported by a bearing supported on the stator, a cooling air duct is provided outside the bearing on the side opposite the wheel. And a plurality of first ventilation holes communicating with the inside of the machine are provided in the inner peripheral portion of the cooling air duct located on the inner diameter side of the bearing and the stator, and are located on the outer diameter side of the bearing. The rotor A plurality of second ventilation holes are provided on the end surface of the frame, and an annular ventilation hole is provided in the cooling air duct with the axle as a center radius and communicating with the inside of the machine through the second ventilation hole. Cooling air taken in from the upper part of the air duct is circulated into the machine through the first ventilation hole on the inner diameter side of the bearing, the annular ventilation hole on the outer diameter side and the second ventilation hole, and the rotor side and the stator. The side is cooled by ventilation.

According to a second aspect of the invention, in the invention according to the first aspect, the axle has a center radius so as to surround a plurality of second ventilation holes provided on the end surface of the rotor frame. A ventilation guide is provided so as to surround an annular second ventilation hole portion provided in the cooling air duct, and the ventilation guides of the annular ventilation hole portions are provided to the second ventilation holes. The ventilation guide of the part is inserted so that a minute gap exists between the inner and outer peripheral surfaces thereof.

Therefore, in the wheel-integrated electric rotating machine having such a structure, a cooling air duct for introducing cooling air into the machine is provided on the outer side of the bearing opposite to the wheel side, and on the outer diameter side of the bearing. Ventilation holes are provided in the corresponding cooling air duct and rotor frame, respectively, and multiple ventilation holes are provided in the cooling air duct and stator corresponding to the inner diameter side of the bearing, and cooling air is taken into the machine from each ventilation hole. With this configuration, the amount of ventilation in the gap between the stator and the rotor is increased, and the heating element portion can be effectively cooled.

According to a third aspect of the present invention, the wheels are rotatably supported through bearings at both ends of the axle fixedly supported by the bogie, and the stator is attached to the axles located inside the respective wheels. , The rotor is mounted on the inner peripheral surface of the rotor frame respectively arranged with a predetermined gap on the outer peripheral surface of the stator, and the wheel side end of each rotor frame is mounted by a bracket on each wheel. In the wheel-integrated wheel-integrated electric motor, which is integrally coupled to each of the rotor frames, the end portions on the side opposite to the wheel of each rotor frame are rotatably supported by respective bearings supported by the stator. One common cooling air duct is provided between the driving electric motors, and a plurality of ventilation holes communicating with the inside of the machine are provided at the inner peripheral portion of the cooling air duct, respectively, and the cooling air taken in from the upper portion of the cooling air duct is provided. It is obtained so as to ventilation cooling by circulated to each of the electric machine through Tsufuana.

Therefore, in the wheel-integrated electric motor having such a structure, one electric motor for driving each wheel is provided with one cooling air duct in common to increase the amount of cooling air and lead the lead wire to the outside. Since it is possible, it is possible to effectively use a narrow space and simplify the structure.

According to a fourth aspect of the present invention, wheels are rotatably supported by bearings at both ends of an axle fixedly supported by a bogie, and a stator is attached to an axle at an inner position of each wheel. , The rotor is attached to the inner peripheral surface of the rotor frame disposed with a predetermined gap on the outer peripheral surface of each of the stators, and the wheel-side end portions of the rotor frames are mounted by brackets as described above. In the wheel-integrated wheel-integrated electric motor, the wheels are integrally coupled to each other, and the end portions on the side opposite to the wheel of each rotor frame are rotatably supported by respective bearings supported by the stator. A plurality of common cooling air ducts supported by the stators are provided between the electric motors driving the motors, and a plurality of cooling air ducts located on the inner diameter side of each of the bearings and the stators communicate with each other in the machine. First of Air holes are provided respectively, and a plurality of second ventilation holes are respectively provided on the end faces of the rotor frames of the both electric motors located on the outer diameter side of the bearings, and the cooling air duct has the axle as a central radius. Further, annular ventilation holes communicating with both machines through the respective second ventilation holes are provided respectively, and cooling air taken in from the upper portion of the cooling air duct is connected to the first ventilation holes on the inner diameter side of each bearing and the outside. Each of the motors is circulated through the radial ventilation holes and the second ventilation hole into the both machines to cool the rotor side and the stator side of each electric motor.

With the wheel-integrated motor having such a structure, it is possible to obtain the same effects as those of the inventions corresponding to the first and second aspects, and, of course, the effective use of space and the simplification of the structure can be achieved. Can be planned.

According to a fifth aspect of the invention, in the invention according to any one of the first to fourth aspects, the air flowing into the cooling air duct is provided by a blower provided outside the machine. It is designed to blow air.

Therefore, in the wheel-integrated electric motor having such a structure, the air flowing into the cooling air duct is blown by the blower provided outside the machine, so that the cooling air amount can be increased.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of the present invention, respectively. FIG. 1 is a cross-sectional view showing a wheel-integrated motor, and FIG. 2 is an enlarged view of a cooling air duct and a cooling air introducing portion into the machine. FIG. The same parts as those in FIG. 5 will be described with the same reference numerals.

In FIG. 1, reference numeral 1 denotes a non-rotating axle, both ends of which are fixedly supported by a bogie frame 3 via shaft support boxes 2. Wheels 5 traveling on rails are rotatably supported at both sides of the axle 1 via bearings 4. A stator core 6 having a coil 7 is attached at a predetermined position inside the axle 1 via a stator member 6a.

Further, a bracket 11 having a plurality of exhaust ports 16 is attached inside the wheel 5, and one end of a cylindrical rotor frame 8 having a permanent magnet 9 on the inner peripheral side is fixed to the other end. The other end of the rotor frame 8 is rotatably supported by a bearing 10 attached to the stator member 6a.

In this case, there is a space of about 2 mm between the outer peripheral surface of the stator core 6 and the inner peripheral surface of the permanent magnet 9.
The bracket 11 and the rotor frame 8 form a rotating portion integrally with the wheel 5, and constitute an outer rotor type wheel-integrated permanent magnet type synchronous motor.

In the wheel-integrated electric motor having such a configuration, in the first embodiment, as shown in FIG. 2, the rotor frame 8 and the bearing 10 on the side opposite to the wheel side of the motor are provided outside the rotor frame 8 rather than the rotor frame 8. A cooling air duct 18 having a large outer diameter is provided and is fixed to the stator member 6a by a mounting bolt (not shown).

The cooling air duct 18 is provided with ventilation holes 19b corresponding to a plurality of ventilation holes 19a provided in the stator member 6a located on the outer peripheral portion of the axle 1 corresponding to the inner diameter side of the bearing 10. The inside of the cooling air duct 18 and the inside of the motor are communicated with each other through these ventilation holes 19a and 19b.

Further, as shown in FIG. 3, an annular ventilation hole 20 having a center radius of the axle is provided at a position corresponding to the rotor frame 8 side on the outer diameter side of the bearing 10 of the cooling air duct 18, and the cooling air duct 18 rotates. A plurality of ventilation holes 21 corresponding to the ventilation holes 20 are also provided on the side surface of the child frame 8 at appropriate intervals. A ventilation guide 23 having an axle as a center radius is provided so as to project toward the duct at each ventilation hole 21 on the frame side, and a ventilation guide 22 is also projected toward the frame at the annular ventilation hole 20 at the duct side. The ventilation guide 22 is inserted into the ventilation guide 23.

In this case, the ventilation guide 22 and the ventilation guide 2
The dimensional relationship is such that x and y between the inner and outer peripheral surfaces of 3 are minute gaps so that the leakage of air to the outside of the machine is minimized. Further, ribs 24 for reinforcement are provided at appropriate intervals in the annular ventilation holes 20 provided on the cooling air guide 18 side.

Further, an opening is provided above the cooling air duct 18, and the opening is communicated with the air supply duct of the cooling blower through the flexible air passage 25 made of bellows.

On the other hand, the lead wire 12 connected to the coil 7
Is drawn into the cooling air duct 18 through the ventilation hole 19a provided in the stator member 6a and the ventilation hole 19b provided in the cooling air duct 18, and then the cooling air duct 18
Is drawn from above.

Although not shown in the figure, a drive motor having the same structure is attached to the wheel on the opposite side. In the wheel-integrated motor configured as described above, the cooling air sent from the blower is introduced into the cooling air duct 18, and then the ventilation guide 22 provided in the annular ventilation portion 20 provided on the outer diameter side of the bearing 10. And a cooling air duct 18 and a stator member which are introduced into the machine through an annular ventilation guide 23 provided so as to surround a plurality of ventilation holes 21 provided on the side surface of the rotor frame 8 and which are provided on the inner diameter side of the bearing 10. The air flows into the machine through the ventilation holes 19b and 19a of 6a.

In this case, the cooling air flowing into the machine through the ventilation guides 22 and 23 on the outer diameter side of the bearing 10 has a higher wind pressure than the cooling air flowing into the machine through the ventilation holes 19a and 19b on the inner diameter side of the bearing 10. Has become.

Therefore, ventilation guides 22 and 23 are introduced from the annular ventilation hole 20 of the cooling ventilation duct 18 on the outer diameter side of the bearing 10.
The cooling air that has flowed into the machine through the plurality of ventilation holes 21 on the rotor frame 8 side passes between the outer peripheral surface of the stator core 6 and the inner peripheral surface of the permanent magnet 9 attached to the rotor frame 8. The cooling air that has passed through the formed voids and that has flowed into the machine through the ventilation holes 19a and 19b on the inner diameter side of the bearing 10 has a shaft provided on the stator core 6 and the stator member 6a on the inner diameter side of the bearing 10. The air passes through the ventilation hole 6b passing through in the direction, and is discharged to the outside of the machine through the exhaust port 16 provided in the bracket 11.

As described above, in the first embodiment, the cooling air duct 18 for introducing the cooling air into the machine is provided on the outer side of the bearing 10 opposite to the wheel side, and the cooling corresponding to the outer diameter side of the bearing 10 is provided. Ventilation holes 20 and 21 are provided in the air duct 18 and the rotor frame 8, and a plurality of ventilation holes 19a and 19b are provided in the cooling air duct 18 and the stator member 6a corresponding to the inner diameter side of the bearing 10 to provide the respective ventilation holes. Since the cooling air is taken into the machine more, the amount of ventilation in the gap between the stator core 6 and the permanent magnet 9 increases,
It is possible to effectively cool the heating elements of the fixed coil 7 and the permanent magnet 9. In particular, a ventilation guide 23 is provided in an annular ventilation hole 21 centered on the axle provided in the rotor frame 8 corresponding to the outer diameter side of the bearing 10, and a plurality of cooling air ducts 18 are provided in the ventilation guide 23. Ventilation hole 20
Since the ventilation guide 22 provided in the section is inserted so that the inner and outer peripheral surfaces thereof form a minute gap, it is possible to improve the effect of blowing air into the machine by minimizing the leakage of air to the outside of the machine.

Even in the bearing 10 having a large diameter that supports the rotor frame 8, the cooling air flows through the ventilation holes on the inner diameter side and the outer diameter side, so that the inner circumference and the outer circumference of the bearing 10 are cooled. The temperature rise of the bearing 10 can be suppressed.

Further, as shown in FIG. 2, the cooling air duct 18 has the bearing 1 with respect to the width a of the ventilation passage to the inner diameter side of the bearing 10.
Ventilation path width b of the ventilation hole 20 at a position corresponding to the outer diameter side of 0
Is enlarged, it is possible to secure the air volume to the ventilation hole 20 portion without reducing the air volume to the inner diameter side of the bearing 10.

FIG. 4 is a sectional view showing a second embodiment of the present invention. In the second embodiment, a common cooling air duct 32 is provided between the motor 30 and the motor 31 coupled to the respective wheels, and the cooling air duct 32 is used for the first cooling air duct 32.
The same ventilation passage as that described in the embodiment is configured to introduce cooling air into the motor 30 and the motor 31, respectively.
The lead wire 17 connected to the coil of each motor is also configured to pass through the cooling air duct 32. That is, one common cooling air duct 32 is provided between the motors for driving the wheels so as to be supported by each stator, and the inside of the cooling air duct 32 located on the inner diameter side of each bearing 10 and the stator are installed in the machine. A plurality of ventilation holes that communicate with the motors 30 and 31 located on the outer diameter side of each bearing 10.
A plurality of ventilation holes are provided on the end surface of the rotor frame, and the cooling air duct 32 is provided with an annular ventilation hole having a center radius of the axle and communicating with both machines through the ventilation holes. Cooling air taken in from the top of the air duct is circulated into both machines through the ventilation holes on the inner diameter side of each bearing and the annular ventilation holes and ventilation holes on the outer diameter side of each bearing, and the rotor side and stator side of each motor Cool with ventilation.

With the wheel-integrated motor having such a structure, it is possible to obtain the same effects as those of the first embodiment, and it is possible to effectively use the space and simplify the structure.

[0041]

As described above, according to the wheel-integrated electric motor of the present invention, it is possible to effectively cool the respective parts inside the machine and to increase the output of the motor due to the increase in the amount of ventilation so that the motor output is within the vehicle limit. It is possible to provide a vehicle-integrated electric motor capable of facilitating the above configuration and improving vehicle performance.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a wheel-integrated electric motor according to the present invention.

FIG. 2 is an enlarged cross-sectional view showing a cooling air duct of FIG. 1 and a cooling air introduction portion into the machine.

FIG. 3 is a diagram showing a configuration of a ventilation hole portion provided on the outer diameter side of the bearing in the same embodiment.

FIG. 4 is a sectional view showing a main part of a second embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a configuration example of a conventional wheel-integrated motor.

FIG. 6 is a side view of FIG. 5 viewed from the side opposite to the wheels.

[Explanation of symbols]

 1 ... Axle 2 ... Axle support box 3 ... Bogie frame 4 ... Bearing 5 ... Wheels 6 ... Stator core 6a ... Stator member 6b ... Ventilation hole 7 ... Coil 8 ... Rotor frame 9 ... Permanent magnet 10 ... Bearing 11 ... Bracket 12 ... Lead wire 16 ... Exhaust port 18, 32 ... Cooling air duct 19a, 19b, 20, 21 ... Ventilation hole 22, 23 ... Ventilation guide 24 ...... Ribs, exhaust port 25 ...... Flexible wind path

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shunichi Kawaji 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation Fuchu Plant

Claims (5)

[Claims] 1. A wheel is rotatably supported via a bearing at one end of an axle fixedly supported by a bogie, and a stator is attached to an axle located inside the wheel, and a predetermined outer peripheral surface of the stator is provided. The rotor is mounted on the inner peripheral surface of the rotor frame arranged with a gap between the rotor frame and the wheel-side end of the rotor frame is integrally connected to the wheel by a bracket, and In an outer rotor type wheel-integrated electric motor in which a wheel-side end is rotatably supported by a bearing supported by the stator, a cooling air duct is supported by the stator on the outside of the bearing on the opposite wheel side. A plurality of first ventilation holes communicating with the inside of the machine are provided in the inner peripheral portion of the cooling air duct located on the inner diameter side of the bearing and the stator, and the rotor located on the outer diameter side of the bearing. Edge of frame A plurality of second ventilation holes are provided, and the cooling air duct is provided with annular ventilation holes each having a center radius of the axle and communicating with the inside of the machine through the second ventilation holes. Cooling air taken in from above is passed through the first ventilation hole on the inner diameter side of the bearing, the annular ventilation hole on the outer diameter side, and the second ventilation hole into the machine to ventilate the rotor side and the stator side. A wheel-integrated electric motor characterized by being cooled. 2. An annular ventilation guide having a central radius of an axle is provided so as to surround a plurality of second ventilation holes provided on the end surface of the rotor frame, and is provided on the cooling air duct. A ventilation guide is provided so as to surround the annular second ventilation hole, and the ventilation guides of the annular ventilation holes are provided in the ventilation guides of the respective second ventilation holes such that a minute gap exists between the inner and outer peripheral surfaces thereof. The wheel-integrated electric motor according to claim 1, wherein the electric motor is integrated into a wheel. 3. A wheel is rotatably supported by bearings on both ends of an axle fixedly supported by a bogie, and a stator is attached to an axle at an inner position of each wheel, and an outer peripheral surface of the stator is provided. While mounting the rotor on the inner peripheral surface of the rotor frame respectively disposed with a predetermined gap, the wheel side end of each rotor frame is integrally coupled to each wheel by a bracket, In each wheel-driving type wheel-integrated electric motor in which the end of each rotor frame on the side opposite to the wheels is rotatably supported by each bearing supported on the stator, one wheel-integrated motor is provided between the motors that drive the wheels. A common cooling air duct is provided, and a plurality of ventilation holes communicating with the inside of the machine are provided at the inner peripheral portion of the cooling air duct, and the cooling air taken in from the upper portion of the cooling air duct is passed through each ventilation hole to each electric motor. Wheel integral motor, characterized in that is distributed and so that ventilation cooling to. 4. A wheel is rotatably supported by bearings on both ends of an axle fixedly supported by a bogie, and a stator is attached to an axle at an inner position of each wheel, and an outer circumference of each stator is provided. The rotors are attached to the inner peripheral surfaces of the rotor frames, which are arranged with a predetermined space on the surface, and the wheel-side ends of these rotor frames are integrally connected to the wheels by brackets. , A wheel-integrated wheel-integrated electric motor in which an end portion of each rotor frame on the side opposite to the wheel is rotatably supported by respective bearings supported by the stator, one between the electric motors driving the respective wheels. A common cooling air duct supported by each of the stators, and a plurality of first ventilation holes communicating with the inner periphery of the cooling air duct located on the inner diameter side of each bearing and the stator in the machine. Respectively,
A plurality of second ventilation holes are respectively provided on the end faces of the rotor frames of the both electric motors located on the outer diameter side of each of the bearings, and the cooling air duct has the axle as a central radius and the second Annular ventilation holes communicating with both machines through the ventilation holes of the respective cooling air ducts, and cooling air taken in from the upper portion of the cooling air duct is provided on the inner diameter side of each of the bearings and on the outer diameter side of each of the first ventilation holes. A wheel-integrated electric motor, characterized in that the electric current is circulated in both machines through the ventilation hole and the second ventilation hole to cool the rotor side and the stator side of each electric motor by ventilation. 5. The wheel integrated according to any one of claims 1 to 4, wherein the air flowing into the cooling air duct is blown by a blower provided outside the machine. Form electric motor.