JP3162622B2 - Wheel integrated motor - Google Patents

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 motor for use in railway vehicles and the like.

[0002]

2. Description of the Related Art In a conventional driving structure for a railway vehicle, a large gear is mounted on an axle integrated with wheels, and a main motor (hereinafter referred to as a motor) is mounted on a shaft of a small gear provided in mesh with the large gear. Are connected to each other, and the rotational force of the motor is transmitted to the wheels via a gear mechanism to drive the wheels.

[0003] In recent years, each wheel drive system integrated with a wheel and a motor as shown in FIG. 5 has been proposed to improve speed of a vehicle by improving running characteristics, reduce noise by eliminating a gear mechanism, and save labor for maintenance. Is being developed.

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

Further, a bracket 11 having a plurality of exhaust ports 16 is attached to the inside of 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 a stator member.

Incidentally, 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 peripheral surface and the inner peripheral surface. 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 wheel 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. The ventilation holes 15a, 15b The inside of the cooling air duct communicates with the inside of the motor machine. Also, the cooling air duct 13
An opening 13a is provided in the upper part of the opening 13a.
Is connected to an air duct of a cooling blower through a flexible air passage 14 made of bellows.

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

The bracket 11 and the rotor frame 8 form a rotating part 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 exactly the same configuration is attached to the opposite wheel.

[0010]

In the wheel-integrated motor having the above-described structure, the cooling air sent from the blower is introduced into the cooling air duct 13 and then cooled.
3 and into the machine through the ventilation holes 15b and 15a of the stator member 6a. And the cooling air that has flowed into this machine
At the same time as passing through a 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 stator core 6 and the stator member 6a are provided. 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 improvement is desired. (1) Cooling air taken into the machine is introduced from the cooling air duct 13 through a plurality of ventilation holes 15a provided in the stator member 6a on the inner peripheral side of the axle. An air gap which passes through an axially penetrating ventilation hole 6b provided in the core 6 and the stator member 6a and has a large ventilation resistance 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 the heating elements is reduced.

Further, when the ventilation holes 6b of the stator core 6 and the stator member 6a are closed, the amount of air flowing into the gap between the stator core 6 and the permanent magnets 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 gap side. (2) On the other hand, the bearing 10 that supports the rotor frame 8 has a large diameter and easily generates heat. However, since the intake of cooling air into the machine is on the inner diameter side of the bearing 10, cooling is effectively performed. Temperature rises easily.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is possible to effectively cool various parts in the machine and to increase the output of the motor by increasing the amount of air flow, thereby enabling the motor to be operated within the vehicle limit. An object of the present invention is to provide a vehicle-integrated electric motor capable of simplifying the configuration of the vehicle and improving vehicle performance.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned object, the present invention constitutes a rotating electric machine integrated with wheels by the following means. According to 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 located inside the wheel. A rotor is mounted on the inner peripheral surface of a rotor frame disposed with a predetermined gap on the outer peripheral surface, and a wheel-side end of the rotor frame is integrally connected to the wheel by a bracket, and the rotor is rotated. In an outer rotor type wheel-integrated motor in which an end of a child frame on the opposite side to a wheel is rotatably supported by a bearing supported by the stator, a cooling air duct is provided outside the bearing on the opposite side to the stator. A plurality of first ventilation holes communicating with the inside of the machine are provided on an inner peripheral portion and a stator of the cooling air duct located on the inner diameter side of the bearing, respectively, and located on the outer diameter side of the bearing. The rotor A plurality of second ventilation holes are provided in the end face of the frame, and annular ventilation holes having the axle as a center radius and communicating with the inside of the machine through the second ventilation holes are provided in the cooling air duct, respectively. The cooling air taken in from the upper part of the air duct 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, and the rotor side and the stator The side is cooled by ventilation.

According to a second aspect of the present invention, in the first aspect of the present invention, the center radius of the axle is set so as to surround the plurality of second ventilation holes provided on the end face of the rotor frame. An annular ventilation guide is provided, and a ventilation guide is provided so as to surround an annular second ventilation hole provided in the cooling air duct, and the ventilation guide of the annular ventilation hole is connected to each of the second ventilation holes. The ventilation guide is inserted so that a minute gap exists between the inner and outer peripheral surfaces.

Therefore, in the wheel-integrated dynamoelectric machine having such a configuration, a cooling air duct for introducing cooling air into the inside of the machine is provided on the outside 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, and a plurality of 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 such a configuration, the amount of air flow in the gap between the stator and the rotor increases, and the heating element can be effectively cooled.

[0017]

[0018]

According to a third aspect of the present invention, wheels are rotatably supported via bearings at both ends of an axle fixedly supported on a bogie, and a stator is mounted on an axle located inside each of the wheels. A rotor is attached to an inner peripheral surface of a rotor frame provided with a predetermined gap on an outer peripheral surface of each of the stators, and a wheel-side end portion of each of the rotor frames is attached to each of the rotor frames by a bracket. In a wheel-driven wheel-integrated electric motor, each wheel-driven motor integrally connected to a wheel and rotatably supporting an end of each rotor frame on a side opposite to the wheel by a bearing supported by the stator, One common cooling air duct is provided between the electric motors driving the stators so as to be supported by the respective stators, and a plurality of cooling air ducts communicating with the inner periphery of the cooling air duct and the stator located on the inner diameter side of the respective bearings are connected to the inside of the machine. First A plurality of air holes are provided, and a plurality of second air holes are provided on the end faces of the rotor frames of the two electric motors located on the outer diameter sides of the respective bearings, and the cooling air duct has the axle as a center radius, Further, annular ventilation holes communicating with the two units through the respective second ventilation holes are provided, and cooling air taken in from the upper part of the cooling air duct is supplied to each of the large ventilation holes on the inner diameter side of each bearing. The air is passed through the respective annular ventilation holes and the second ventilation holes on the radial side into the two machines to cool the rotor side and the stator side of each motor.

With the wheel-integrated motor having such a configuration, it is possible to obtain the same operation and effects as those of the first and second aspects of the present invention, as well as to effectively utilize the space and simplify the structure. Can be planned.

[0021] The invention corresponding to claim 4 is claim 1 to claim 1.
In the invention corresponding to any one of the third aspects, the air flowing into the cooling air duct is blown by a blower provided outside the machine.

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

[0023]

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

In FIG. 1, reference numeral 1 denotes a non-rotating axle. Both ends of the axle 1 are fixedly supported on a bogie frame 3 via a shaft support box 2. Wheels 5 running on rails are rotatably supported at both sides of the axle 1 via bearings 4. At a predetermined position inside the axle 1, a stator core 6 having a coil 7 is mounted 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 6a.

In this case, there is a gap 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 part integrally with the wheel 5, and constitute a permanent magnet synchronous motor of an outer rotor type and a wheel integrated type.

In the wheel-integrated electric motor having such a structure, in the first embodiment, as shown in FIG. 2, the rotor frame 8 and the bearing 10 on the side opposite to the wheel of the motor are located outside 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 by the ventilation holes 19a and 19b.

Further, at a position corresponding to the rotor frame 8 on the outer diameter side of the bearing 10 of the cooling air duct 18, an annular ventilation hole 20 having a center radius of the axle is provided as shown in FIG. A plurality of ventilation holes 21 are provided on the side surface of the child frame 8 at appropriate intervals corresponding to the ventilation holes 20. A ventilation guide 23 having an axle as a center radius is provided at each of the ventilation holes 21 on the frame so as to protrude toward the duct, and a ventilation guide 22 is also protruded toward the frame at the annular ventilation hole 20 on 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 are small gaps between the inner and outer peripheral surfaces of the device 3 so as to minimize air leakage to the outside of the device. The annular ventilation holes 20 provided on the cooling air guide 18 are provided with ribs 24 for reinforcement at appropriate intervals.

Further, an opening is provided above the cooling air duct 18, and this opening communicates with an air duct of a cooling blower through a flexible air path 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 a ventilation hole 19a provided in the stator member 6a and a ventilation hole 19b provided in the cooling air duct 18, and then the cooling air duct 18
From above.

Although not shown, a drive motor having exactly the same structure is mounted on the opposite wheel. In the wheel-integrated motor configured as described above, after the cooling air sent from the blower is introduced into the cooling air duct 18, the ventilation guide 22 provided on the annular ventilation 20 provided on the outer diameter side of the bearing 10. The cooling air duct 18 and the stator member which flow 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.

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, the ventilation guides 22 and 23 are formed through the annular ventilation holes 20 of the cooling ventilation duct 18 on the outer diameter side of the bearing 10.
The cooling air flowing 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. Cooling air that has passed through the formed gap and that has flowed into the machine through the ventilation holes 19a and 19b on the inner diameter side of the bearing 10 is provided on the stator core 6 and the shaft provided on the stator member 6a on the inner diameter side of the bearing 10. The air passes through the ventilation hole 6 b penetrating in the direction, and is discharged outside 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 cooling air into the machine is provided outside the bearing 10 opposite to the wheel side, and the cooling air 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 19 a and 19 b are provided in the cooling air duct 18 and the stator member 6 a corresponding to the inner diameter side of the bearing 10. Since the configuration is such that cooling air is taken into the machine, the amount of ventilation in the gap between the stator core 6 and the permanent magnet 9 increases,
The heating elements of the fixed coil 7 and the permanent magnet 9 can be effectively cooled. 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 provided in the ventilation guide 23 are provided in the ventilation guide 23. Ventilation hole 20
Since the ventilation guide 22 provided in the portion is inserted so that the inner and outer peripheral surfaces thereof are minute gaps, leakage of air to the outside of the machine can be minimized, and the effect of blowing air into the machine can be improved.

Further, even in the case of the bearing 10 having a large diameter for supporting 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 is arranged so that the width of the ventilation passage a to the inner diameter side of the bearing 10 is larger than that of the bearing 1.
Ventilation path width b of 20 ventilation holes 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 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 connected to each wheel, and the cooling air duct 32
The cooling air is introduced into the motor 30 and the motor 31 by configuring the same ventilation path as described in the embodiment,
The lead wires 17 connected to the coils of the motors also pass through the cooling air duct 32. That is, one common cooling air duct 32 is provided between the motors driving the respective wheels so as to be supported by the respective stators, and the inner peripheral portion of the cooling air duct 32 located on the inner diameter side of each bearing 10 and the stator are provided inside the machine. The motors 30 and 31 located on the outer diameter side of each bearing 10 are provided with a plurality of ventilation holes respectively communicating with the bearings.
A plurality of ventilation holes are respectively provided on the end face of the rotor frame, and the cooling air duct 32 is provided with annular ventilation holes having an axle as a central radius and communicating with both insides through the respective ventilation holes. The cooling air taken in from the upper part of the air duct is passed through each ventilation hole on the inner diameter side of each bearing and each annular ventilation hole on the outer diameter side and the ventilation holes into both machines, and the rotor side and the stator side of each motor. Ventilation cooling.

With the wheel-integrated motor having such a configuration, not only can the same operation and effect as in the first embodiment be obtained, but also effective use of space and simplification of the structure can be achieved.

[0041]

As described above, according to the wheel-integrated electric motor of the present invention, each part in the machine can be effectively cooled, and the output of the motor can be increased by increasing the amount of ventilation so that the motor can be operated within the vehicle limit. Can be provided, and a vehicle-integrated electric motor capable of improving vehicle performance can be provided.

[Brief description of the 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 sectional view showing a cooling air duct and a cooling air introduction portion into the machine of FIG. 1;

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

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

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

FIG. 6 is a side view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Axle 2 ... Shaft support box 3 ... Truck frame 4 ... Bearing 5 ... Wheel 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 …… Rib, exhaust port 25 …… Flexible airway

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shunichi Kawaji 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Toshiba Fuchu factory (56) References JP-A-5-344680 (JP, A) (58) Investigated Field (Int.Cl. ⁷ , DB name) H02K 9/00-9/28

Claims (4)

(57) [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 mounted on an axle located at an inner position of the wheel. The rotor is mounted on the inner peripheral surface of the rotor frame provided with the gap, and the wheel-side end of the rotor frame is integrally connected to the wheel by a bracket. In an outer rotor type wheel-integrated 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 outside the opposite wheel side bearing. A plurality of first ventilation holes which are provided on the inner periphery and the stator of the cooling air duct located on the inner diameter side of the bearing, respectively, and are provided on the outer diameter side of the bearing. The edge of the frame A plurality of second ventilation holes are provided, and the cooling air duct is provided with annular ventilation holes having the axle as a center radius and communicating with the inside of the machine through the second ventilation holes, respectively. Cooling air taken in from the upper part 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, so that the rotor side and the stator side are ventilated. A wheel-integrated electric motor characterized by cooling. 2. An annular ventilation guide having an axle as a center radius is provided so as to surround a plurality of second ventilation holes provided on an end face 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 holes, and the ventilation guides of the annular ventilation holes are arranged such that a minute gap exists between the inner and outer peripheral surfaces of the ventilation guides of the respective second ventilation holes. The wheel-integrated electric motor according to claim 1, wherein the electric motor is inserted into a wheel. 3. A wheel is rotatably supported at both ends of an axle fixedly supported by a bogie via bearings, and a stator is attached to an axle located inside each of the wheels, and an outer periphery of each of the stators is provided. The rotors are respectively attached to the inner peripheral surfaces of the rotor frames arranged with a predetermined gap on the surface, and the wheel side ends of these rotor frames are integrally connected to the respective wheels by brackets. A wheel-integrated wheel-integrated motor in which each rotor frame is rotatably supported by a bearing supported by the stator on an opposite wheel side end, wherein one motor is provided between the motors driving each wheel. A plurality of first ventilation holes communicating with the inner periphery of the cooling air duct and the stator, which are located on the inner diameter side of each of the bearings, inside the machine. Are provided, respectively.
A plurality of second ventilation holes are respectively provided on the end faces of the rotor frames of the electric motors located on the outer diameter sides of the bearings, and the cooling air duct has the axle as a center radius, and the second Annular ventilation holes communicating with both units through the ventilation holes are provided, and the cooling air taken in from the upper part of the cooling air duct is supplied with the respective large 1 ventilation holes on the inner diameter side of each bearing and the respective annular rings on the outer diameter side. A wheel-integrated electric motor characterized in that the electric motor is caused to flow through the ventilation holes and the second ventilation holes into the two motors so as to cool the rotor side and the stator side of each electric motor. 4. The integrated wheel according to claim 1, wherein the air flowing into the cooling air duct is blown by a blower provided outside the machine. Shaped motor.