JPH05344680A - Outer rotor motor for vehicle - Google Patents

Abstract

PURPOSE:To improve the cooling capacity while adopting self ventilation method, and materialize downsizing, and also, enable the output increase under the limit of a vehicle. CONSTITUTION:A wheel 32 is supported rotatably by an axle 31 through a bearing 21. A rotor frame 33 has a permanent magnet 16 fixed at its inside periphery, and one end in axial direction is fixed to the end face of the wheel 32 through bolts 34, and has a mirror cover 36 fixed on the other side through bolts 35, and this mirror cover 36 is supported rotatably to the axle 31 through a bearing 18. Moreover, the rotor frame 33 is provided, radially on the circumference on axle side 32, with a plurality of fan-shaped apertures 33a so that they may form radial fans between it and a rib. An iron core 38 is fixed to the axle 31, and an armature coil 10 is inserted and fixed in a slot groove, and a plurality of ventilation holes 38b, which extends in the direction of lamination and passes through the armature coil 10, are arranged equally in circumferential direction. An iron core presser 39 is provided, in the same position as each ventilation hole 38b, with a ventilation hole 39a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer rotor motor for a vehicle, which directly drives wheels of a trolley for traveling a railway vehicle, and more particularly to improvement of a cooling structure thereof.

[0002]

2. Description of the Related Art As a conventional system for driving the wheels of a bogie for running a railway vehicle, there is a parallel cardan system as shown in FIG. This parallel cardan system is roughly composed of a large gear 2 and a wheel 3 mounted on an axle 1, a small gear 4 meshing with the large gear 2, and a twisting joint 7 mounted on a shaft 6 of the small gear 4 and a main motor 5, respectively. Has been done.

Further, the small gear 4 and the large gear 2 are covered by a gear case (not shown), the axle 1 is supported by a shaft box device having a bearing (not shown), and the shaft box device is supported by a bogie frame by a shaft spring or the like. Was configured.

A controlled electric power is supplied to the main motor 5,
When the shaft 6 of the main electric motor 5 rotates, its rotational force is transmitted to the large gear 2 via the twist joint 7 and the small gear 4, and the axle 1 is rotated.
Is rotated to drive the wheels 3 which are press-fitted and attached to the axle 1 to drive the vehicle.

However, in recent years, the speeding up of vehicles has become a new technical subject and is being researched and developed. For this reason, it has become necessary to significantly reduce the weight of the vehicle body and the bogie. Further, in order to safely drive the curved portion at high speed, it has become necessary to control the rotation of each wheel. For this reason, the weight of the structure of the electric equipment / device mounted on the vehicle body and under the floor is being greatly reduced by using aluminum material or the like.

On the other hand, in order to reduce the weight of the carriage and control the rotation of each wheel, the main motor 5 can be safely supported by a conventional drive system such as the parallel cardan system driven by the small gear 4 and the large gear 2. It is necessary to provide the small gear 4, the large gear 2 and the like, and further, to support them safely and transmit the rotational force of the main electric motor 5 to the wheels 3, a bogie frame having sufficient strength is required. Since it is necessary, there is a limit to the weight reduction, which is a problem.

By the way, the conventional vehicle electric motor has a stator on the outside and a rotor on the inside. 18 and 19 show a configuration example of such a vehicle electric motor.
Shows the case where the forced ventilation system is adopted, and FIG. 19 shows the case where the self ventilation system is adopted. That is, FIG. 18 and FIG.
As shown in FIG. 3, the outer side is usually fixed to a bogie not shown by a stator 8, the inner side of the stator 8 is a rotor 9, and the rotational force from the rotor shaft of the rotor 9 is from a small gear or a large gear. The wheels are driven through the gear drive system.

On the other hand, an outer rotor motor is being adopted which directly drives each wheel without using a small gear or a large gear. The detailed structure and operation of this outer rotor motor will be described below.

FIG. 20 is a sectional view of a trolley in which the outer rotor electric motor is mounted, and FIG. 21 is a sectional view of the upper half of the outer rotor electric motor. 20 and 21, the armature 12 including the armature coil 10 and the iron core 11 is attached to the armature shaft 13. The armature shaft 13 is the same as the axle (hereinafter referred to as the axle). Further, a plurality of permanent magnets 16 are equidistantly mounted on the rotor 14 in the inner circumferential direction of the rotor frame 15 so as to form a permanent magnet field. Further, a mirror lid 17 is attached to one end of the rotor frame 15, and the mirror lid 17 is rotatably attached to the axle 13 via a bearing 18.

On the other hand, the other end of the rotor frame 15 is provided with wheels.
19 is fixed via a bolt 20, and the wheel 19 is attached to the axle 13 via a bearing 21 so that the rotor 14 is attached to the axle 13.
It is configured to be rotatable with respect to. Also, the axle
13 is supported by an axle support device (not shown), and the shaft springs 22,
It is configured to be attached to the bogie frame 24 via 23. Further, the axle 13 is provided with a hollow hole 13a, and a lead wire 25 is wired through the hollow hole 13a and connected to the armature coil 10. Reference numeral 26 indicates a vehicle limit.

In the above structure, when a controlled power source (current) is applied to the armature coil 10 through the lead wire 25 in the magnetic field generated by the permanent magnet 16, mutual forces act on each other to cause the rotor 14 to rotate. A torque is generated in the wheel to rotate, the torque is directly transmitted to the wheel 19 fixed to the rotor frame 15, and the wheel 19 is driven. Further, since the wheels 19 are independent of each other, it is possible to control each wheel individually.

As is well known, the main motor of any structure cannot be downsized unless the cooling performance is improved. In the vehicle electric motor shown in FIG. 18 in which the outside is the stator described above, cooling air is introduced from the blower 27 provided outside through the duct 28 to cool the inside and then discharged to the outside. In the vehicle electric motor shown in FIG. 19, a fan 29 is attached to the axle 1, cooling air is introduced through a filter 30 attached to the stator 8, and after cooling the inside, it is discharged to the outside through the fan 29. ing. That is, when the stator is on the outside, it cannot be considered that there is no factor that hinders the improvement of the cooling performance.

[0013]

However, in an outer rotor motor that directly drives each wheel without using a gear, the armature 12 located inside does not rotate as shown in FIG. Is impossible to install inside the electric motor, and the rotor frame 15 rotates even if an attempt is made to introduce cooling air from the outside,
It was difficult to install a ventilation duct. As a result, unless the cooling performance is improved, it is difficult to reduce the size and weight of the electric motor, and it is difficult to increase the size of the electric motor in order to increase the output due to the vehicle limit 26.

Therefore, in order to take advantage of the characteristics of the outer rotor type electric motor, in order to reduce the unsprung weight of the bogie and to speed up the vehicle, the cooling performance is improved, and the outer rotor electric motor of small size, light weight and high output appears. Was desired.

On the other hand, as an example of the cooling system for the outer rotor motor, there is the one shown in FIG. In this system, a fan 29 is attached to a wheel 19, cooling air is sucked through a suction hole 15a provided in the rotor frame 15, the inside of the electric motor is cooled, and then discharged through the fan 29. However, since the outer rotor frame 15 rotates, the cooling performance must be limited.

That is, since the outer rotor motor has a structure in which the outer side rotates, it is difficult to connect the duct, and it is difficult to adopt the forced ventilation system. Further, even when the self-ventilation method is adopted, it is difficult to mount the filter or connect the duct because of the structure in which the outer side rotates, which is difficult to adopt.

Therefore, an object of the present invention is to provide an outer rotor motor for a vehicle, which adopts a self-ventilation system, improves the cooling performance, is small and lightweight, and can increase the output within the vehicle quantity limit. Especially.

Another object of the present invention is to prevent dust from entering and to improve cooling performance while adopting a self-ventilation system or a forced ventilation system, aiming at reduction in size and weight and increase in output within the vehicle limit. An object of the present invention is to provide an outer rotor electric motor for a vehicle that enables it.

[0019]

In order to achieve the above-mentioned object, the present invention comprises a stator fixed to an axle and a rotor rotatably supported, and the rotor is rotatably supported on the axle. In an outer rotor motor for a vehicle fixed to an axle, a plurality of fan-shaped openings are provided radially on the circumference of a rotor frame that constitutes a rotor, and the axle is tubular with both ends open and rotates. It is configured to communicate with the inside of the child frame.

In order to achieve the above-mentioned other objects, the present invention comprises a stator fixed to an axle and a rotor rotatably supported, and the rotor is rotatably supported on the axle. In an outer rotor motor for a vehicle that is fixed to wheels, a ventilation hole is provided in an iron core that constitutes a stator,
A hollow portion is formed on the axle so as to communicate with a blower disposed outside, and the hollow portion is configured to communicate with the inside of the rotor frame through a ventilation hole.

[0021]

According to the above structure, when the rotor rotates,
A fan action is generated by a fan-shaped opening provided on the circumference of the rotor frame, and cooling air is sucked from both end openings of the tubular axle, flows through the axle, and is introduced into the rotor frame. ..
The cooling air introduced into the rotor frame cools the heat generating portion of the stator and the like, and is then discharged to the outside from the opening. Therefore,
Even if the rotor is arranged outside and rotates, the self-ventilation method can be adopted, and the cooling air can flow through the rotor and effectively cool the heat generated by the stator. it can.

Further, according to the above-mentioned other structure, when the blower is driven, the cooling air discharged from the blower flows through the hollow portion of the axle and is introduced into the ventilation hole of the iron core. The cooling air introduced into the ventilation holes cools the heat generating portion of the stator and the like, and is then discharged to the outside from the wheels or the rotor frame. Therefore,
Even if the rotor is placed outside and rotates, the forced ventilation system can be adopted, harmful substances such as dust do not enter from the outside, and the cooling air flows from the ventilation holes of the iron core to the rotor frame. It is possible to flow through the inside and effectively cool the heat generating portion of the stator and the like.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view showing an upper half of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG.

In FIGS. 1, 2 and 3, reference numeral 31 denotes an axle, which is formed in a hollow tubular shape, and a cover (not shown) having a filtering function, such as a wire mesh, is attached to the openings at both ends, and FIG. As shown, the bogie frame 24 via the shaft springs 22 and 23
It is supported by being restrained from rotating. Wheel 32, wheel 19
It has substantially the same shape as and is rotatably supported via a bearing 21 press-fitted into an axle 31. The rotor frame 33 is formed in a substantially cylindrical shape, and one side in the axial direction (left side in FIG. 1) is a bolt.
It is fixed to the end surface of the wheel 32 via 34, and the mirror lid 36 is fixed to the other side via bolts 35. The mirror lid 36 has substantially the same shape as the mirror lid 17, and is rotatably supported by the axle shaft 31 via a bearing 18 press-fitted into the axle shaft 31. From the above,
The wheel 32, the rotor frame 33, and the mirror lid 36 are integrally rotatably supported by the axle 31.

In the above structure, a plurality of permanent magnets 16 forming a field are arranged on the inner peripheral surface of the rotor frame 33 so as to be equally arranged. The iron core 38 has an electric iron plate 38a having a slot groove, which is fitted to the axle 31 so as to face the permanent magnet 16 and is fixed by iron core retainers 39 and 39. This iron core 38
The armature coil 10 is inserted and fixed to the slot shaft of
It is connected to an external power supply via a lead wire (not shown). It should be noted that the iron core 38 is provided with a plurality of ventilation holes 38b extending in the stacking direction (or the axial direction) and penetrating the core 38 evenly along the circumferential direction so as to be at the same position as the ventilation holes 38b. A plurality of ventilation holes 39a are provided in the iron core retainers 39, 39, respectively.

Further, the rotor frame 33 is provided with a plurality of fan-shaped openings 33a arranged radially on the circumference of the end portion on the side of the wheels 32, and a radial fan is formed between the rotor frame 33 and the ribs 33b. On the outer peripheral side of the opening 33a, a wire mesh-like cover 37 is attached to the rotor frame 33 so as to cover the opening 33a. On the other hand, on the axle 31, on the side opposite to the opening 33a with respect to the iron core 38,
A communication hole 31a communicating with the inside of the rotor frame 33 is provided at one location or at a plurality of locations along the circumferential direction.

Next, the operation of the embodiment configured as described above will be described. When a predetermined controlled current is applied to the armature coil 10 placed in the magnetic field of the permanent magnet 16 from the outside through a lead wire (not shown), the permanent magnet 16 and the iron core 38
A force acts on each other to generate a torque. Since the rotation of the iron core 38 side is restricted, the rotor frame 33 rotates and the integrated wheels 32 are driven.

At the same time when the rotor frame 33 rotates, the fan effect is promoted by the openings 33a and the ribs 33b of the rotor frame 33 forming the radial fan.
Cooling air is sucked from both ends of the axle 31 as shown by an arrow in FIG. 1, flows through the inside of the axle 31, and is introduced into the rotor frame 33, that is, the inside of the electric motor from the communication hole 31a.

The cooling air introduced into the electric motor passes through the ventilation holes 34a of the iron core retainer 34 and the ventilation holes 38b of the iron core 38 as shown by the arrows in FIG.
After passing through the gap of 16, the armature coil 10 and the iron core 38 are cooled, and after cooling, they are discharged to the outside through the opening 33a.

Therefore, according to the embodiment constructed as described above, the openings and the ribs provided on the circumference of the rotor frame form the radial fan as they are, so that a new cooling fan is provided. You don't need to, you can save space,
An outer rotor motor can be configured. Also, because space can be used effectively, the output is increased within the vehicle limit,
In addition, it can be made smaller and lighter, which greatly contributes to speeding up the vehicle.

Next, another embodiment of the present invention will be described. The embodiment described above will be referred to as the first embodiment below.

4 and 5 show a second embodiment of the present invention. In FIGS. 4 and 5, 40 is a rotor frame, and this rotor frame 40 is the rotor frame described above.
33 has the opening 33a only on the wheel 32 side, whereas
On the side opposite to the wheel 32, a plurality of fan-shaped openings 40a similar to those of the above-described first embodiment are provided radially and equally, and a radial fan is formed with the rib 40b. That is, the opening 40a
Are provided at both ends of the permanent magnet 16. Further, 41 is an axle, and this axle 41 is formed in a hollow tubular shape like the axle 31 described above, and has one end or a communication hole 41a communicating with the inside of the motor at both ends of the iron core 11 along the circumferential direction. At multiple locations. The iron core and the iron holder are not provided with ventilation holes for cooling air. The other configurations are the same as those in the first embodiment.

With the above structure, two rows of radial fans can be formed in the same space as in the first embodiment, the cooling performance is improved, and the output can be increased.

6 and 7 show a third embodiment of the present invention. As shown in FIGS. 6 and 7, the rotor frame 33
Reinforcing ribs 33c on the ribs 33b of the rotor frame
Provide on the circumference of 33. The other configurations are the same as those in the first embodiment.

With the above-described structure, the reinforcing rib 33c can increase the rigidity of the rotor frame 33 and can exert the effect of the radial fan in cooperation with the rib 33b. It can be further improved compared to the first embodiment.

In each of the embodiments described above, the axles are divided into left and right sides, and cooling air is sucked through the openings at both ends of each axle, and the inside of the electric motor is cooled by the self-ventilation method. A blower may be provided outside and a forced ventilation system may be used in which cooling air is forcibly supplied from this blower to cool.

8 and 9 show a fourth embodiment of the present invention. In this embodiment, the axle is not divided into left and right, but a blower is provided outside to cool the inside of the electric motor by a forced ventilation method. That is, in FIGS. 8 and 9, 42 is a bogie underframe, and an axle 43 is supported on the bogie underframe 42 via a shaft spring (not shown). The axle 43 is formed in a hollow tubular shape, and a wheel 44 is rotatably supported via a bearing 45 so as to be symmetrical with respect to the center in the axial direction. A rotor frame 47 forming a rotor 46 is fixed to the end surface of the wheel 44 via a bolt (not shown). The rotor frame 47 has a plurality of permanent magnets 16 forming field magnets arranged equidistantly on its inner peripheral surface, and the side surface opposite to the wheel 44 is rotatably supported by the axle 43 via a bearing 48. Further, an iron core 50 forming a stator 49 is attached to the axle 43 at a position facing the permanent magnet 16. The iron core 50 is formed by stacking electric iron plates 50a, and a stator winding 51 is inserted and fixed in the slot groove.

Further, a blower 27 is attached to the vehicle body (not shown).
Is attached to the iron core 50, and four ventilation holes 50b are provided radially at substantially the center in the axial direction and four ventilation holes that are communicated with each ventilation hole 50b and are provided along the axial direction. Hole 50c
As shown in FIG. 10 (a), four ventilation holes 50d are provided between the ventilation holes 50c and 50c and provided along the axial direction. On the other hand, on the axle 43, the ventilation holes 50b of the iron core 50 are provided.
4 communicating holes 43a that are in radial communication with each other, a communicating hole 43b that communicates with the duct 52 that is connected to the blower 27 at a substantially axial center, and a partition plate 43c that is located axially outside of the communicating hole 43a. Is provided. Instead of forming the axle 43 in a hollow tubular shape, as shown in FIG. 10 (b), there are provided four communication holes 43d along the axial direction, and each communication hole 43d is connected to each of the iron cores 50. You may make it communicate with the hole 50c.

Next, the operation of the fourth embodiment constructed as described above will be explained. Car body (not shown) by blower 27
The clean cooling air sucked from the upper part flows into the axle 43 through the duct 52 and the communication hole 43b, splits in both directions in the axle 43, and is introduced from the communication hole 43a into the communication hole 50b of the iron core 50. The cooling air introduced into the communication hole 50b is split in both directions in the communication hole 50c and discharged to both sides of the iron core 50 in the axial direction. Iron core 50
The cooling air discharged to the wheel 44 side is discharged to the outside through the gaps or openings between the spokes of the wheel 44. The cooling air discharged to the opposite side of the wheel 44 of the iron core 50 is the iron core 50 and the permanent magnet.
It flows through the gap 53 between 16 and is discharged to the wheel 44 side. The cooling air that flows as described above cools the iron core 50 and the stator windings 51.

By configuring as described above, dust,
Even when used in an adverse environment with many harmful substances such as metal powder, water, oil, etc., the harmful substances are accumulated inside the motor to eliminate the causes such as deteriorating ventilation and damaging internal components. Therefore, it is possible to omit maintenance work such as conventional air blowing.

FIG. 11 shows a fifth embodiment of the present invention. In the figure, reference numeral 54 denotes an iron core. The iron core 54 is formed by stacking electric iron plates 54a, and communicates with a plurality of communication holes 54b radially provided at substantially the center in the axial direction, and diagonally to both sides. A plurality of communication holes 54c extending in the vertical direction are provided. Other than that, the configuration is the same as that of the fourth embodiment described above.

With the above configuration, the iron core 54
The cooling air discharged from the communication hole 54c of the
At 51, the cooling effect can be increased.

FIG. 12 shows a sixth embodiment of the present invention. In the figure, 55 is an iron core, and this iron core 55 is formed by laminating electric iron plates 55a and providing a radial duct 55a. The iron core 55 is provided with a plurality of communication holes 55b radially provided at the approximate center in the axial direction, and a communication hole 55c communicating with each of the communication holes 55b, extending in the axial direction, and communicating with the radial duct 55a. .. Further, the rotor frame 46 has the same configuration as that of the above-described fourth embodiment except that an opening 46a through which cooling air can be discharged is provided on the side surface of the rotor frame 46 on the side opposite to the wheels 44.

With the above configuration, the iron core 55
Since the cooling air introduced into the core core 55 also flows in the iron core 55 along the radial direction, the cooling effect of the iron core 55 and the stator winding 51 can be further increased.

FIG. 13 shows a seventh embodiment of the present invention. In the figure, reference numeral 56 designates an iron core, which is formed by stacking electric iron plates 56a, and is provided with ventilation holes 56b along the axial direction. The axle 43 has an end surface opposite to the wheels 44 of the iron core 56. A communication hole 43a is provided in the vicinity. Other than that, the configuration is the same as that of the fourth embodiment described above.

With the above configuration, the axle 43
After introducing the cooling air from the outside of the iron core 56 into the electric motor,
Since the fluid flows in the communication hole 56b and the gap 53 in the same direction, the flow becomes smooth and the cooling effect can be increased.

FIG. 14 shows an eighth embodiment of the present invention. In the figure, reference numeral 57 denotes a wheel, and the wheel 57 is mounted on the wheel 43 by a bearing 45.
It is rotatably supported via a fan 29 and is attached with a fan 29. Further, the axle 43 has a filter at the center in the axial direction.
58 is attached, and this discharge side is connected to the communication hole 43b of the axle 43. No blower is provided. Other than that, the configuration is the same as that of the fourth embodiment described above.

With the above structure, the cooling air is sucked from the filter 58 by the fan 29 of the wheel 57 and introduced into the electric motor through the axle 43, so that a blower requiring maintenance is omitted. The configuration can be simplified.

FIG. 15 shows a ninth embodiment of the present invention. As shown in the figure, a communication hole 43 between the vehicle body (not shown) and the axle 43
Connect b with duct 59. The other configurations are the same as those of the above-described eighth embodiment.

With the above structure, clean cooling air can be taken in from the vehicle body (not shown), and the blower can be omitted as in the case of the eighth embodiment described above.

FIG. 16 shows a tenth embodiment of the present invention. As shown in the figure, the axle is composed of left and right axles 60, 60. Each axle 60 has axial springs (not shown) at both ends.
Is supported by the bogie underframe 42 through a hollow tubular shape, and the center side end in the axial direction is connected to the blower 61 through the duct 62 to form an iron core.
Communication holes 60a communicating with the communication holes of 49 are radially provided, and a partition plate 60b is provided at a portion outside the communication hole 60a. Other than that, the configuration is the same as that of the fourth embodiment described above.

With the above configuration, each axle is independent and the trackability of the track is improved.

[0053]

As described above, according to the present invention, a plurality of fan-shaped openings are provided radially on the circumference of the rotor frame constituting the rotor, and the axle is tubular with both ends open. Since it communicates with the inside of the rotor frame, there is no need to install a cooling air blower, and the cooling performance is improved by the self-ventilation method. The output can be increased, the unsprung weight of the bogie can be minimized due to the reduction in size and weight, and it is possible to provide an outer rotor motor for a vehicle that greatly contributes to speeding up of the vehicle. Further, a ventilation hole is provided in the iron core that constitutes the stator, and a hollow portion that communicates with a blower disposed outside is formed on the axle, and this hollow portion is communicated with the inside of the rotor frame through the ventilation hole. Therefore, the forced ventilation system prevents the invasion of harmful substances such as dust from the outside to extend the maintenance return and improve the cooling performance.
A small space allows the output to be increased in a limited space within the vehicle limit, and the unsprung weight of the bogie can be minimized due to its small size and light weight, which greatly contributes to speeding up the vehicle. An outer rotor motor for a vehicle can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing an upper half of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a view on arrow B of FIG.

FIG. 4 is a sectional view showing the upper half of another embodiment (second embodiment) of the invention.

FIG. 5 is a view on arrow C of FIG.

FIG. 6 is a cross-sectional view showing the upper half of another embodiment (third embodiment) of the invention.

FIG. 7 is a cross-sectional view of FIG. 6E-E.

FIG. 8 is a sectional view showing still another embodiment (fourth embodiment) of the present invention.

9 is a cross-sectional view showing the main parts of still another embodiment (fourth embodiment) of the present invention shown in FIG.

10 is a cross-sectional view taken along line EE of FIG.

FIG. 11 is a sectional view showing a main part of still another embodiment (fifth embodiment) of the invention.

FIG. 12 is a sectional view showing a main part of still another embodiment (sixth embodiment) of the present invention.

FIG. 13 is a sectional view showing a main part of still another embodiment (seventh embodiment) of the present invention.

FIG. 14 is a sectional view showing still another embodiment (eighth embodiment) of the invention.

FIG. 15 is a sectional view showing still another embodiment (9th embodiment) of the present invention.

FIG. 16 is a sectional view showing still another embodiment (10th embodiment) of the present invention.

FIG. 17 is a plan view of a conventional parallel cardan type driving device.

FIG. 18 is a cross-sectional view of a main part of a conventional forced ventilation type electric motor for a vehicle.

FIG. 19 is a cross-sectional view of a main part of a conventional self-ventilated vehicle electric motor.

FIG. 20 is a cross-sectional view of a truck using a conventional vehicle outer rotor motor.

FIG. 21 is a sectional view showing an upper half of a conventional vehicle outer rotor electric motor.

22 is a cross-sectional view showing an upper half of an outer rotor motor for a vehicle, which is different from the conventional vehicle of FIG. 21.

[Explanation of symbols]

10 ... Armature coil, 11, 38, 50, 54, 55, 56 ... Iron core, 16
… Permanent magnets, 27, 61… Blowers, 31, 41, 43, 60… Axles,
31a, 41a, 43a, 60a ... Communication holes, 32, 44, 57 ... Wheels,
33, 40, 47 ... Rotor frame, 33a, 40a ... Opening part, 33
C ... ribs, 38b, 50b, 50c, 54b, 54c, 55b, 55c
… Ventilation holes.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshikatsu Hasegawa 1st in Toshiba Fuchu factory, Fuchu-shi, Tokyo (72) Inventor Toshiro Hasebe 1st Toshiba-cho, Fuchu, Tokyo Toshiba Fuchu factory, inc.

Claims (3)

[Claims] 1. An outer rotor electric motor for a vehicle, comprising a stator fixed to an axle and a rotor rotatably supported, the rotor being fixed to a wheel rotatably supported on the axle. A plurality of fan-shaped openings are provided radially on the circumference of a rotor frame that constitutes the rotor,
The outer rotor electric motor for a vehicle, wherein the axle has a tubular shape with both ends open and is configured to communicate with the inside of the rotor frame. 2. The outer rotor electric motor for a vehicle according to claim 1, wherein ribs are radially arranged on a circumference between adjacent openings. 3. An outer rotor electric motor for a vehicle, comprising a stator fixed to an axle and a rotor rotatably supported, the rotor being fixed to a wheel rotatably supported on the axle. An air vent is provided in an iron core that constitutes the rotor, and a hollow portion that communicates with a blower disposed outside is formed in the axle, and the hollow portion is communicated with the inside of the rotor through the air vent. An outer rotor electric motor for a vehicle, which is configured as described above.