JPH05344682A - Outer rotor motor - Google Patents

Abstract

PURPOSE:To circulate clean cooling air inside a motor so as to improve the reliability on insulation and elongate the life by exhausting the dust, etc., contained in incoming air separately. CONSTITUTION:An armature 8 is fixed to an axle 11. A rotor frame 27, which constitutes a rotor 26, is made in nearly cylindrical shape, and a plurality of permanent magnets 14 are attached to the inside periphery, and a bearing bracket 28 is attached on one side in axial direction, and also it is fixed to the end face of the axle 18, and a bearing bracket 29 is fixed on the other side in axial direction. Moreover, the rotor frame 27 is provided, in circumferential direction at the periphery near the bearing bracket 28, with a plurality of air exhaust ports 30, and, at the inside periphery, with fans 31, and with air exhaust plates 32, and, in circumferential direction at the periphery near the bearing bracket 29, with a plurality of air exhaust ports 33 and, at the inside periphery, with fans 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an outer rotor permanent magnet synchronous electric motor (hereinafter referred to as an outer rotor electric motor) which directly drives wheels of a trolley in order to drive a railway vehicle.

[0002]

2. Description of the Related Art Conventionally, there is a parallel cardan system as shown in FIG. 9 as a system for driving wheels of a bogie to run a railway vehicle.

In this parallel cardan system, 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 mounted on the shaft 5a of the small gear 4 and a main motor 5, respectively. It was roughly composed of 6. The small gear 4 and the large gear 2 are covered by a gear case (not shown), the axle 1 is supported by an axle box device having bearings (not shown), and the axle box device is supported by a bogie underframe by an axle spring or the like. Was configured.

When a controlled power source (current) is supplied to the main electric motor 5 and the shaft 5a of the main electric motor 5 rotates, the rotational force is transmitted to the large gear 2 via the twist joint 6 and the small gear 4 and the axle. 1 is rotated, the axle 3 that is press-fitted and attached to the axle 1 is driven, and the vehicle runs.

However, in recent years, the speeding up of vehicles has been researched and developed as a new technical subject, and therefore it has become necessary to significantly reduce the weight of the vehicle body and the bogie. Therefore, the structure of electric devices / apparatuses mounted on the vehicle body and under the floor is largely made of an aluminum material to reduce the weight. Furthermore, in order to safely travel at high speed on a curved portion, it has become necessary to control the rotation of each wheel.

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 have the small gear 4, the large gear 2, etc.
In order to transmit the rotational force of the above to the wheel 3, a bogie underframe having sufficient strength is required, and there is a limit to weight reduction, which is a problem.

Further, since the left and right wheels 3 are attached to the same axle 1, it is impossible to drive each wheel 3 individually.

Therefore, in order to solve this problem, conventionally, without using a small gear or a large gear as shown in FIG. 10,
Outer rotor electric motors that directly drive wheels are being adopted. Next, the detailed configuration and operation will be described with reference to FIGS. 10 and 11.

FIG. 10 shows a cross-sectional view of a bogie using an outer rotor electric motor for individually driving each wheel, and FIG. 11 shows a cross-sectional view of the outer rotor electric motor.

As shown in FIGS. 10 and 11, the armature 8 having the armature coil 9 and the iron core 10 is attached to the armature shaft 11. The armature shaft 11 is the same as the axle (hereinafter referred to as the axle). The rotor 12 has a plurality of permanent magnets 14 equally mounted on the inner peripheral surface of the rotor frame 13 along the circumferential direction so as to form a permanent magnet field. Bearing brackets 14 and 15 are attached to both ends of the rotor frame 13 via unillustrated bolts. The bearing brackets 14 and 15 are attached to the axle 11 via bearings 16 and 17 so that the rotor 12 can rotate with respect to the axle 11. The rotor frame 13 is fixed to the wheels 18 via unillustrated bolts and the like.

On the other hand, the axle 11 is supported by an axle support device (not shown) and is attached to the bogie underframe 21 via axle springs 19 and 20. A hollow hole (not shown) is provided in the axle 11, and a lead wire 22 is arranged through this hollow hole and connected to the armature coil 9.

In the above structure, when a controlled power source (current) is applied to the armature coil 9 through the lead wire 22 in the magnetic field formed by the permanent magnet 14, mutual forces act to cause the rotor 12 to rotate. The wheel 18 is rotated by receiving the rotational force, the rotational force is directly transmitted to the wheel 18 fixed to the rotor 12, and the wheel 18 is driven. Further, since the wheels 18 and 18 are independent of each other, it is possible to control each wheel individually.

When the armature coil 9 is energized, the temperature of the iron core 10 and the armature coil 9 rises. However, outside air is taken in through the air intake holes 23 provided in the bearing bracket 14 and the temperature near the bearing bracket 15 is increased. The iron core 10 is circulated inside the motor by the suction action of the fan 24 provided and discharged to the outside of the machine through the exhaust hole 25.
And cooling the armature coil 9.

[0014]

However, the outer rotor motor is different from the conventional conventional motor in that the outer peripheral portion rotates, so that it is difficult to dispose dust and the like by providing a filter in the intake hole. Therefore, dust and the like accumulate inside the motor, and the air volume decreases. Due to the decrease in air flow, the temperature of the armature rises and insulation reliability deteriorates, that is, it becomes a factor that shortens the life of the motor body.

The present invention has been made in view of the above-mentioned circumstances, and by separating and discharging the dust and the like contained in the intake air, clean cooling air is circulated inside the motor to improve insulation reliability. It is an object of the present invention to provide an outer rotor electric motor which is improved and has a long life.

[0016]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides an armature and a permanent magnet having an inner periphery that forms a gap with the outer periphery of the armature along the circumferential direction. A rotor having a plurality of rotor frames is provided, the armature is fixed via a shaft body, one side in the axial direction of the rotor frame is fixed to the driven body and the first bearing bracket, and the other side is fixed to the second side. Fixed to the first bearing bracket, the first bearing bracket is provided with an air inlet hole, the rotor frame in the vicinity of the second bearing bracket is provided with a plurality of first exhaust holes along the circumferential direction, and In an outer rotor electric motor in which a first bearing bracket and a second bearing bracket are rotatably supported by a shaft through bearings, respectively, a first bearing bracket The outer periphery of the bets vicinity of the rotor frame is obtained by such provision of the plurality of second exhaust air holes along the circumferential direction.

[0017]

The plurality of second exhaust holes provided on the outer periphery of the rotor frame act as a fan by the rotation of the rotor frame. Due to this fan action, if dust or the like is mixed in the cooling air introduced from the outside, since the mass of the dust or the like is larger than that of air, a large centrifugal force is added.
Therefore, dust or the like is discharged to the outside from the second exhaust hole by this large centrifugal force, and the cleaned cooling air flows inside the motor to cool the armature, and then from the first exhaust hole. It is discharged to the outside. Therefore, dust or the like does not accumulate inside the motor, and good cooling performance can be maintained and the life can be extended.

[0018]

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

In FIGS. 1 and 2, an armature 8 has an iron core 10 in which electric iron plates are laminated, and an armature coil 9 inserted and fixed in a slot groove provided on the outer peripheral side of the iron core 10. It is attached by press fitting, etc., and its axial end is pressed onto the iron core.
It is fixed at 25 mag. The lead wire 22 connected to the armature coil 9 is wired through a hollow hole (not shown) provided in the axle 11 and is connected to a terminal box (not shown) provided outside. The iron core 10 and the iron core retainer 25 are provided with a plurality of cooling air flow holes (not shown) arranged along the axial direction and equally distributed along the circumferential direction.

The rotor 26 is a conventional rotor frame.
A rotor frame 27 having a substantially cylindrical shape similar to 13, a plurality of permanent magnets 14 attached to the inner peripheral surface of the rotor frame 27 along the circumferential direction, and one side of the rotor frame 27 in the axial direction. The bearing bracket 28, which is fixed via a bolt (not shown) and has substantially the same shape as the conventional bearing bracket 15, is fixed via a bolt (not shown) to the other side of the rotor frame 27 in the axial direction. It is composed of a bearing bracket 29 having a substantially similar shape to the bearing bracket 14, and the end portion of the rotor frame 27 on the bearing bracket 28 side is fixed to the end surface of the wheel 18 via a bolt (not shown), and the bearing bracket 28 is Since the bearing bracket 29 is rotatably supported on the axle 11 via the bearing 16 and the bearing bracket 29 is rotatably supported on the axle 11 via the bearing 17, the rotor 26 is It is rotatably supported on the axle 11 together with the wheels 18.

Further, the rotor frame 27 has a ventilation hole along the circumferential direction on the outer periphery in the vicinity of the bearing bracket 28.
A plurality of 30 are provided, a fan 31 and an air exhaust plate 32 are provided below the air exhaust hole 30, and an air exhaust hole is provided along the circumferential direction on the outer periphery near the bearing bracket 29 as in the conventional rotor frame 13. A plurality of 33 are provided, and a fan 34 is provided on the inner circumference of the air exhaust hole 33. Here, the air exhaust plate 32 is formed in a cylindrical shape that is coaxial with the rotor frame 27 and has an edge that is inclined so that the side opposite to the bearing bracket 28 expands, and the end on the expanded side of the air exhaust hole 30. The fan 31 is provided so as to be continuous with the lower portion of the inner wall and the end surface of the fan 31 is continuous with the outer surface side of the edge. The fan 31 has a substantially triangular shape, and the end surface on the side of the exhaust plate 32 has an exhaust plate.
The end surface of the bearing bracket 28, which is inclined corresponding to the inclined edge of 32, is close to the end surface of the bearing bracket 28.

Next, the operation of the embodiment constructed as above will be described. When the rotor 26 is rotated, that is, the rotor frame 27 is rotated, the cooling air is transferred to the bearing bracket 28.
1 is taken into the inside of the motor through an air inlet 35 provided in the motor as shown by an arrow a in FIG. 1, and this cooling air is given a centrifugal force by the air exhaust hole 30 and mainly by the fan 31. Therefore, since the dust or the like having a large mass has a large centrifugal force, the dust or the like is blown to the outer peripheral side of the air exhaust plate 32 and is exhausted from the air exhaust hole 30 to the outside of the motor. On the other hand, since the clean cooling air has a small mass and a small centrifugal force, it passes through the inside of the exhaust plate 32 and enters the inside of the motor, and the circulation hole (not shown) that penetrates the gap 36 and the iron core 10 and the iron retainer 25. ), Cools the armature 8 and is discharged from the discharge hole 33 to the outside of the motor through the fan 34.

Therefore, according to the embodiment configured as described above, the dust and the like mixed in the cooling air introduced from the outside is separated and discharged, and the clean cooling air is circulated inside the motor. It is possible to provide an outer rotor electric motor that has a long life and prevents deterioration of insulation reliability due to accumulation of dust and the like.

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

FIG. 3 is a sectional view showing the main part of the second embodiment of the present invention. In the second embodiment, the fan in the first embodiment described above is omitted. That is, the rotor
In the rotor frame 27 that constitutes 37, the air exhaust plate 32 is provided on the inner diameter side of the air exhaust hole 30 in the same circumferential direction, but the fan 31 is not provided. The other configurations are the same as those of the above-described first embodiment.

In the second embodiment, dust or the like is separated from the cooling air sucked by the centrifugal force by the fan action of the air exhaust hole 30,
It is blown to the outer peripheral side of the air exhaust plate 32 and discharged from the exhaust hole 30 to the outside of the motor.

FIG. 4 is a sectional view showing the main part of the third embodiment of the present invention. In the third embodiment, the fan and the exhaust plate in the first embodiment described above are omitted. That is, the rotor frame 27 that constitutes the rotor 38 has a fan
31 and the exhaust plate 32 are not provided. The other configurations are the same as those of the above-described first embodiment. In this third embodiment, the air exhaust hole 30
The dust and the like are separated from the cooling air sucked by the centrifugal force due to the fan action and are discharged to the outside of the motor through the air exhaust hole 30.

FIG. 5 is a sectional view showing the main part of the fourth embodiment of the present invention. The fourth embodiment omits the exhaust plate in the first embodiment described above. That is, the rotor
The fan 31 is provided on the rotor frame 27 that constitutes 39, but the exhaust plate 32 is not provided.

The other structure is the same as that of the first embodiment. In the fourth embodiment, the centrifugal force generated by the fan action of the fan 31 and the air exhaust hole 30 separates dust and the like from the sucked cooling air and exhausts it from the air exhaust hole 30 to the outside of the motor.

FIG. 6 is a cross sectional view showing the main part of the fifth embodiment of the present invention. In the fifth embodiment, the air exhaust plate of the first embodiment is divided into a plurality of parts, which are provided in a part near the fan. That is, in the rotor frame 27 that constitutes the rotor 40, the air exhaust plates 32 in the above-described first embodiment are divided into the same number as the fan 31 on the inner diameter side of the air exhaust holes 30, and the width is wider than the air exhaust holes 30. The widened exhaust plate 51 is provided. The other configurations are the same as those of the above-described first embodiment. In the fifth embodiment, the effect of the air exhaust plate 51 is further added to the above-described fourth embodiment, and dust and the like are separated from the sucked cooling air and exhausted from the air exhaust hole 49 to the outside of the motor.

FIG. 7 is a longitudinal sectional view showing the main part of the sixth embodiment of the present invention, and FIG. 8 is a view taken in the direction of arrow B in FIG. In the sixth embodiment, the bracket in the first embodiment described above is omitted and the wheels are provided with blades. That is,
The rotor 41 includes the bracket in the first embodiment described above.
No 28 is provided. Further, the wheel 42 is connected to the axle 11 via the bearing 16.
A blade 43 which is rotatably supported and also serves as a spoke is provided. The gap 44 between the adjacent blades 43 is inclined on both upper and lower faces toward the fan 31. Other than that, the configuration is the same as that of the first embodiment described above. In addition, the blade 43, the wheel 42
It may be provided so as to project to the end surface on the side opposite to the motor.

In the sixth embodiment, a centrifugal force is applied to the cooling air sucked when the wheels 42 rotate, and a large mass of dust or the like is guided to the air exhaust hole 30 by the air conditioning plate 32, and the air exhaust hole 30 is discharged. To the motor side. According to this configuration, since dust and the like are separated before reaching the fan 31, it is possible to improve the separation effect as well as the separation effect of the fan 31. Further, since the cooling air is circulated from the small diameter side to the large diameter side within the wheel 42, that is, the inclination angle is provided, the separation performance can be further improved.

[0033]

As described above, according to the present invention, since a plurality of exhaust holes are provided along the circumferential direction on the outer circumference of the rotor frame near the bearing bracket arranged on the wheel side, Due to the fan action of this exhaust hole, it is possible to add a large centrifugal force to dust etc. having a large mass compared to air and discharge it to the outside, maintaining good cooling performance and improving insulation reliability. It is possible to provide an outer rotor electric motor having a long life.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of the upper half of one embodiment of the present invention.

2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view showing a main part of another embodiment (second embodiment) of the present invention.

FIG. 4 is a cross-sectional view showing the main parts of still another embodiment (third embodiment) of the invention.

FIG. 5 is a sectional view showing a main part of still another embodiment (fourth embodiment) of the present invention.

FIG. 6 is a cross-sectional view showing the main parts of still another embodiment (fifth embodiment) of the present invention.

FIG. 7 is a sectional view showing a main part of still another embodiment (sixth embodiment) of the invention.

FIG. 8 is a view on arrow B of FIG. 7.

FIG. 9 is a plan view of a conventional parallel cardan drive device.

FIG. 10 is a transverse cross-sectional view of a bogie using a conventional outer rotor motor.

FIG. 11 is a cross-sectional view in which an upper half portion of a conventional outer rotor electric motor is cut.

[Explanation of symbols]

8 ... Armature, 9 ... Armature coil, 10 ... Iron core, 11 ... Axle,
14 ... Permanent magnets, 16, 17 ... Bearings, 18, 42 ... Wheels, 26, 37,
38, 39, 40, 41 ... Rotor, 27 ... Rotor frame, 28, 29
… Bearing brackets, 30,33… Exhaust holes, 31,34… Fan, 32,51… Exhaust plates, 35… Inlet holes, 36… Gap.

Claims (4)

[Claims] 1. A rotor having an armature and a rotor frame having a plurality of permanent magnets provided on an inner circumference thereof in a circumferential direction so as to form a gap with an outer circumference of the armature,
The armature is fixed via a shaft body, one axial side of the rotor frame is fixed to the driven body and the first bearing bracket, and the other side is fixed to the second bearing bracket, Of the first bearing bracket is provided with an air inlet hole, and a plurality of first holes are circumferentially provided on the outer periphery of the rotor frame near the second bearing bracket.
An outer rotor electric motor, in which the first bearing bracket and the second bearing bracket are rotatably supported by the shaft body via bearings, respectively, in the vicinity of the first bearing bracket. 2. An outer rotor electric motor, characterized in that a plurality of second exhaust holes are provided along the circumferential direction on the outer periphery of the rotor frame. 2. One or more air exhaust plates having an edge inclined so that one end is connected to the lower portion of the inner wall of the second air exhaust hole, on the inner periphery of the rotor frame near the first bearing bracket. The outer rotor electric motor according to claim 1, wherein the outer rotor electric motor is provided. 3. The outer rotor electric motor according to claim 1, wherein a fan is provided below the second exhaust hole at the inner periphery of the rotor frame near the first bearing bracket. 4. At least one wind exhaust having an edge on the inner periphery of the rotor frame near the first bearing bracket, the one end being inclined so as to be connected to the lower portion of the inner wall of the second air exhaust hole. An outer rotor electric motor comprising a plate and a fan having one end surface connected to the exhaust plate.