JPH07203660A - Outer rotor motor for vehicle - Google Patents

Abstract

PURPOSE:To remove magnetic powdery dust contained in the cooling air introduced through a ventilation channel. CONSTITUTION:An arrow-like plate 19, for introducing the outer cooling air to the inside through the mesh of an end plate 11, is disposed in the lower center of a ventilation channel 16. An electromagnet 18 for magnetizing the plate 19 to attract the magnetic powdery dust containing in the cooling air is disposed below the plate 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is mounted on a railway vehicle,
The present invention relates to a rotary electric machine excited by a permanent magnet, and more particularly, to an outer rotor motor for a vehicle in which magnetic foreign matter is prevented from adhering to the permanent magnet.

[0002]

2. Description of the Related Art FIG. 8 is a cross-sectional view showing an example of a general conventional rotary electric machine driven by using excitation by a permanent magnet, which is usually called a fully closed type and is inserted into a rotor 8. The magnet 1B is shielded from the outside, and cooling is performed by the fins 2a formed on the outer periphery of the outer frame 2.

In order to apply a rotating electric machine driven by the excitation of such a permanent magnet to a railway vehicle, the rotating electric machine is provided in a limited space under the floor of the vehicle, so that the weight and the outer shape are limited. Therefore, it is required to be compact and lightweight. Therefore, in natural air cooling, the temperature rise value exceeds the allowable value. Therefore, a method is adopted in which air for cooling is directly fed into the rotating electric machine to cool it.

FIG. 9 shows a conventional vehicle outer rotor electric motor driven by utilizing excitation of a permanent magnet when used in a railway vehicle. In FIG. 9, the bearing is arranged from the shaft center of the wheel 12.
The armature core 4 is shrink-fitted onto the armature shaft 6 projecting in a cantilever shape via 10 and, on the outer peripheral side of the armature core 4,
The armature coil 3 is inserted. Furthermore, the armature shaft 6
A mirror lid 11 is inserted into the right end of the mirror lid 11, and an air passage 16 is inserted into the mirror lid 11 further toward the end. This ventilation path 16
An air filter 16a is detachably attached to the inlet of the.

A plurality of fans 15 are radially mounted on the wheel 12, and a flange portion 9a of a cylindrical rotor frame 9 is in contact with the outer surface of the wheel 12 so that the rotor frame 9
Is fixed to the wheel 12 by a plurality of bolts 13 inserted into the mounting holes provided in the flange portion 9a and having tips formed on the wheel 12 and screwed into the screw holes. Between the inner circumference at the right end of the roller frame 9 and the outer circumference of the mirror lid 11, a bearing 10
A is inserted.

In the vehicle outer rotor electric motor constructed as described above, as the wheels 12 rotate, the internal air is exhausted to the outside by the fan 15, and a negative pressure is applied from the ventilation passage 16 to the inside. External air is inhaled.

[0007]

By the way, since the rotary electric machine used in a railroad vehicle is often arranged under the floor of the vehicle as described above, the rails, wheels, and The magnetic substance such as iron powder generated by the wear of the brake shoe is scattered and floats.

Therefore, when the cooling air is taken in from the outside of the rotating electric machine, dust of these magnetic substances enters the inside of the rotating electric machine and adheres to the internal permanent magnet 1A.
If a large amount of these foreign substances of the magnetic substance are adsorbed to the permanent magnet 1A, the temperature rises abnormally due to a decrease in the cross-sectional area of the airflow, or if they adhere to the outer circumference of the armature coil 3 or the armature core 4, they may cause insulation failure. There is also

Therefore, the present invention is to provide an outer rotor motor for a vehicle capable of preventing foreign matter of a magnetic material from entering the rotating electric machine while taking in outside air as cooling air.

[0010]

According to a first aspect of the present invention, there is provided a stator and a ventilation duct which are inserted into an axle, a shaft coaxial with the axle and one side of which is fixed to a side surface of a wheel to form a magnetic pole on an inner circumference. An outer rotor motor for a vehicle having a rotor provided with an electromagnet, characterized in that a guide plate made of a magnetic material for guiding cooling air from the ventilation duct to the inside of the rotor and an electromagnet ventilation duct for magnetizing the guide plate are provided. And

Further, according to a second aspect of the present invention, a stator and a ventilation duct inserted in the axle, and an electromagnet coaxial with the wheel, one side of which is fixed to a side surface of the wheel and which serves as a magnetic pole on the inner circumference are disposed. In an outer rotor motor for a vehicle equipped with a rotor, a guide plate made of a magnetic material that guides cooling air from the ventilation duct to the inside of the rotor is provided in the ventilation duct so as to be vertically movable, and is connected to the main circuit power source to magnetize the guide plate. It is characterized in that a pair of driven electromagnets are provided in the ventilation duct.

[0012]

According to the first aspect of the invention, the dust of the magnetic material mixed in the cooling air supplied from the ventilation duct to the inside of the rotor is collected on the guide plate magnetized by the electromagnet.

Further, in the invention described in claim 2,
The dust of the magnetic material mixed in the cooling air supplied from the ventilation duct to the inside of the rotor is collected by the guide plates magnetized by the pair of electromagnets excited by the main circuit power supply, and the collected dust is It is demagnetized by the stop of the main circuit power supply and removed from the guide plate that moved down.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle outer rotor motor of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of a vehicle outer rotor electric motor of the invention described in claim 1 which is driven by being excited by a permanent magnet, and is a view corresponding to FIG. 9 shown in the prior art. Also, FIG.
3 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a partially enlarged detailed view of FIG. 2, and FIG. 4 is a sectional view taken along the line BB of FIG.

In FIGS. 1, 2, 3 and 4, an armature 5 having an armature coil 3 and an iron core 4 is attached to an armature shaft 6. The armature shaft 6 is a part of the axle 7, and projects from the wheel 12 in a cantilever shape. A plurality of permanent magnets 1 are equally arranged in the rotor frame 9 in the inner circumferential direction of the rotor frame 9, and the permanent magnets 1 form a field.

Further, a mirror lid 11 is attached to the right end of the rotor frame 9 via a bearing 10, and this mirror lid 11
Are attached to the axle 7. Rotor frame 9
Is rotatably attached to the mirror lid 11 by a bearing 10. As shown in FIG. 2, a net 11a is attached to the mirror lid 11 between the cross-shaped spoke portions, and the spoke portions are provided with female screw holes 11b for fixing the ventilation passages 16.

On the other hand, the other end of the rotor frame 9 is a bolt.
It is fixed to the outer surface of the wheel 12 via 13, and this wheel 12
By being attached to the axle 7 via the bearing 14, the rotor 8 is rotatable with respect to the axle 7.

Fans 15 are radially provided on the wheels 12, and arc guides are provided on the air passage 16 as shown in FIG.
17 are provided. Further, an electromagnet 18 that is turned on and off in synchronization with turning on and off of the main circuit is attached to the lower portion of the ventilation path 16, and a cap-shaped plate 19 made of a magnetic material is attached to the upper portion of the electromagnet 18. This plate 19
Is normally fixed by a stopper 20 shown in FIG. 4 (a), but by opening the stopper 20 as shown in FIG. 4 (b), the ventilation passage 16 can be opened as shown in FIG. 4 (b). It is possible to pull it out.

Next, the operation of the vehicle outer rotor electric motor constructed as described above will be described. When the wheel 12 rotates, the air inside is exhausted due to the intake action of the fan 15 attached to the wheel 12, and the inside of the negative pressure is
It is sucked in from the outside through the ventilation passage 16. At this time, around the electric motor, magnetic substances such as iron powder that are wound up by the running wind of the vehicle and caused by the abrasion of the train tracks, wheels, and brake shoes are floating.

Therefore, the foreign substances of these magnetic substances are also sucked into the ventilation passage 16 at the same time and enter the ventilation passage 16. Since the electromagnet 18 at the bottom of the ventilation path 16 uses the main circuit as a power source, the electromagnet 18 is energized to generate a magnetic force by turning on the power of the main circuit, but when the main circuit is shut off, the electromagnet 18 is also deenergized. It is designed to lose its magnetic force.

Therefore, when the rotating electric machine rotates and sucks the outside air, a magnetizing force is generated. Therefore, the magnetic substance mixed in the intake air is adsorbed on the magnetized plate 19. Only the cooling air can be sucked into the machine. Further, when the power source of the main circuit is cut off, the electromagnet 18 is demagnetized and the adsorbed magnetic material is released. The released foreign matter of the magnetic material falls and is discharged to the outside of the electric motor.

The plate 19 is provided with guides on both sides of the plate 19 so that it can be removed, and is normally fixed with a stopper so that it can be removed and cleaned at the time of regular inspection.

Further details will be described. When the armature coil 3 is energized from the power source controlled via the lead wire 21 in the magnetic field generated by the permanent magnet 1, the rotor 8 is subjected to torque by the electromagnetic force acting between the permanent magnet 1 and the armature 3. Wheels that rotate and are fixed to the rotor frame 9
12 is driven.

Then, as described above, the cooling air is taken in from the air inlet of the ventilation passage 16 due to the intake effect of the fan 15, but the ventilation passage 16 has an arc-shaped guide 17, and the cooling air is left and right by the guide 17. It flows to the bottom through the side of the ventilation passage.

Further, a cap-shaped plate 19 is attached to the lower part of the ventilation passage, and as shown in FIG. 3, the cooling air rises along the upper surface thereof and flows into the electric motor. Then, during operation of the electric motor, since the main circuit is powered on, the electromagnet 18 attached to the lower part of the ventilation passage is excited, the cap plate 19 is magnetized, and the magnetism mixed in the cooling air is magnetized. Foreign matter on the body is adsorbed, and clean cooling air can be blown into the machine. Also, when the main circuit power is cut off,
The energization of the electromagnet 18 is also cut off, and the cap-shaped plate 19 also loses its magnetic force, and the foreign matter of the magnetic substance adsorbed on the upper portion of the plate 19 falls and collects on the bottom of the box 22.

The foreign matter of the magnetic material accumulated on the bottom is removed by removing the cover 23 at the time of regular inspection of the electric motor. Further, since the plate 19 can be taken out by removing the stopper 20, it is possible to remove other foreign matter adsorbed and attached to the plate 19.

Next, FIG. 5 is a cross-sectional view showing an embodiment of the outer rotor motor for a vehicle according to the present invention, which corresponds to FIG. 2, and FIG. 6 is a partially enlarged detailed view of FIG. 4 is a diagram corresponding to FIG. 3. 5 and FIG. 6, unlike FIG. 1, FIG. 2 and FIG. 3, two electromagnets 24a and 24b are vertically arranged at the lower part of the ventilation passage so that the polarities are opposite to each other. The electromagnets 24a and 24b use the main circuit as a power source. Of these, the electromagnet with the upper plate 19
24a is movable in the vertical direction, and when raised, it closes the hole 25 in the lower part of the ventilation passage as shown in FIG. Further, outlets 26 are provided on both sides of the box 22.

When wheels (not shown) rotate as the vehicle travels, outside air is drawn into the rotating electric machine through the ventilation passage by the action of a fan attached to the rotor or a blower. At this time, magnetic substances, such as iron powder, which are discharged due to wear of train tracks, wheels, and brake shoes, which have been wound up by the vehicle running wind and the like, are floating around the electric motor.

Therefore, the foreign substances of these magnetic substances are also sucked in at the same time and enter the ventilation passage. A pair of electromagnets are arranged in the lower part of this ventilation path so that their polarities are opposite to each other. Since this electromagnet uses the main circuit as its power source, the electromagnet is energized when the main circuit is powered on. Generated magnetic force, the repulsive force of each other raises the movable plate with electromagnet, closes the hole at the bottom of the ventilation passage, and shuts off the power supply to the main circuit. The plate is lowered, and this plate is also demagnetized.

Therefore, when the electric motor rotates and sucks the outside air, a magnetic force is generated, so that the magnetic substance mixed in the intake air is a magnetized plate.
It is adsorbed by 19 and can be sent into the machine as clean cooling. Further, when the power of the main circuit is cut off, the electromagnet loses its magnetic force, and the adsorbed magnetic material is easily discharged to the outside of the electric motor.

A more detailed description will be given. When a wheel (not shown) rotates, as described above, the intake action of the fan 15 causes
Cooling air is taken in from the air inlet of the ventilation passage 16, but this ventilation passage 16 has a canopy-shaped guide 17, and the cooling air is divided into left and right by the guide 17 and passes through the side surface of the ventilation passage 16 at the bottom. Flows to. Further, a cap-shaped plate 19 is attached to the lower part of the ventilation passage 16, and as shown in FIG. 6, the cooling air rises along the upper surface thereof and flows into the inside of the electric motor.

The electromagnets 24a and 24b provided in the lower portion of the ventilation passage 16 for taking in the cooling air of the electric motor are energized when the main circuit power source of the vehicle is turned on to generate a magnetic force and face each other with the same pole. Therefore, the upper plate 19 with the electromagnet 24a, which is movable due to the repulsive force of each other, rises to close the hole 25 in the lower part of the ventilation passage. Further, since the plate 19 is magnetized, the magnetic substance mixed in the intake air is
It can be adsorbed to the plate 19 attached to the electromagnet 24a, and only clean cooling air can be sucked into the machine.

When the electric motor is stopped, the electromagnet 24a,
24b is demagnetized, and the plate 19 with the electromagnet on the upper side descends, and releases the adsorbed powdery magnetic substance. The released foreign matter of the magnetic material is discharged to the outside from the discharge port 26 on the side surface of the box 2.

[0034]

As described above, according to the invention of claim 1,
In a vehicle outer rotor electric motor equipped with a stator and a ventilation duct inserted in the axle, and a rotor provided coaxially with the wheel and having one side fixed to the side surface of the wheel and an electromagnet serving as a magnetic pole on the inner circumference, The magnetic material guide plate that guides the cooling air from the duct to the inside of the rotor and the electromagnet that magnetizes this guide plate are installed in the ventilation duct, so that dust of magnetic material mixed in the cooling air supplied from the ventilation duct to the inside of the rotor To
Since it is collected by the guide plate magnetized by the electromagnet, it is possible to obtain an outer rotor motor for a vehicle that can prevent foreign matter of a magnetic material from entering the rotating electric machine while taking in external air as cooling air. .

According to the second aspect of the present invention, the stator and the ventilation duct inserted in the axle, and the electromagnet provided coaxially with the axle, one side of which is fixed to the side surface of the wheel and which serves as a magnetic pole on the inner circumference, are provided. In an outer rotor motor for a vehicle equipped with a rotor arranged, a guide plate made of a magnetic material that guides cooling air from a ventilation duct to the inside of the rotor is provided in a ventilation duct so as to be vertically movable, and a guide plate connected to a main circuit power source is provided. By providing a pair of electromagnets that are magnetized and driven in the ventilation duct, magnetic substance dust mixed in the cooling air supplied from the ventilation duct to the inside of the rotor was magnetized by the pair of electromagnets excited by the main circuit power supply. The guide plate collects the dust, and the collected dust is removed from the guide plate that was demagnetized by the stop of the main circuit power supply and moved downward, so while taking in external air as cooling air, It is possible to obtain an outer rotor electric motor vehicle capable of preventing the rolling entry of foreign matter magnetic into electric.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an outer rotor motor of the invention according to claim 1.

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

FIG. 3 is an enlarged detailed view of FIG.

4A is a sectional view taken along line BB of FIG. FIG. 3B is a partial cross-sectional view showing the operation of the outer rotor motor according to the first aspect of the invention.

FIG. 5 is a longitudinal sectional view showing an embodiment of the outer rotor motor according to claim 2;

FIG. 6 is a partially enlarged detailed view of FIG.

FIG. 7 is a partially enlarged detailed view showing the operation of the outer rotor electric motor according to claim 2;

FIG. 8 is a sectional view showing an example of an electric motor using a conventional outer rotor electric motor.

FIG. 9 is a vertical sectional view showing an example of a conventional outer rotor motor.

[Explanation of symbols]

1, 11A ... Permanent magnet, 2 ... Outer frame, 3 ... Armature coil, 4
... Iron core, 5 ... Armature, 6 ... Armature shaft, 7 ... Axle, 8 ... Rotor, 9 ... Rotor frame, 10, 14 ... Bearing, 11 ... Mirror lid, 12 ... Wheels, 16 ... Ventilation path, 18 ... Electromagnet , 19 ... plate, 24a ... upper electromagnet, 24b ... lower electromagnet.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shunichi Kawaji No. 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation Fuchu factory

Claims (2)

[Claims] 1. A vehicle having a stator and a ventilation duct inserted into an axle, and a rotor provided coaxially with the axle, one side of which is fixed to a side surface of a wheel and an electromagnet serving as a magnetic pole is provided on an inner circumference of the rotor. An outer rotor electric motor for a vehicle, comprising: a guide plate made of a magnetic material that guides cooling air from the ventilation duct into the rotor; and an electromagnet that magnetizes the guide plate. 2. A vehicle having a stator and a ventilation duct inserted into an axle, and a rotor provided coaxially with the axle, one side of which is fixed to a side surface of a wheel and an electromagnet serving as a magnetic pole is provided on an inner circumference of the rotor. In the outer rotor motor, a pair of guide plates made of a magnetic material for guiding cooling air from the ventilation duct to the inside of the rotor are provided in the ventilation duct so as to be movable up and down, and are connected to a main circuit power source to magnetize and drive the guide plates. An outer rotor electric motor for a vehicle, wherein an electromagnet is provided in the ventilation duct.