JPH0412606A - Magnetic shielding device, vehicle and magnetic shielding body for magnetic levitation train - Google Patents

Abstract

PURPOSE:To reduce flux leakage and to prevent trouble of magnetic force by surrounding one or more pairs of electromagnets disposed on the opposite sides at the lower section of a vehicle and electromagnets disposed oppositely thereto on the opposite rail sides integrally with a magnetic shield circuit except the opposing face thereof. CONSTITUTION:One or more pairs of superconducting magnets 4 are fixed to the opposite ends of an axle 5' supporting an auxiliary wheel 5 at the under side of a vehicle 1. A rail 2 comprises a bed 6 and a guideway 7 where a levitation guide coil 8 and a thrust coil 9 are arranged continuously in the advancing direction of the vehicle 1. Upper, lower and back faces, other than the opposing face, of the superconducting magnet 4, the thrust coil 9 and the levitation guide coil 8 are surrounded by a magnetic shield having U-shaped cross section in order to prevent flux leakage. Consequently, trouble on the instruments in a cabin 3, trainman, external communication lines, and the like can be prevented effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic shielding device for a magnetically levitated train, and more particularly to a magnetic shielding device for an ultrahigh-speed magnetically levitated train that levitates and travels using superconducting electromagnets.

[Conventional technology]

Magnetic levitation trains generally have a superconducting electromagnet installed at the bottom of the vehicle, and the vehicle levitates through interaction with the magnetic force generated by a levitation guide coil and a propulsion coil installed on the opposite track side. It is designed to run along with the vehicle.

The magnetic field generated by the superconducting electromagnets of such maglev trains is strong, and the strong magnetic field extends to the inside of the train and the outside of the tracks, which can have a negative impact on people inside the train and cause damage to the train. There is a risk that it will have a negative impact on private houses and communication cables along the route.

Therefore, conventionally, Japanese Patent Application Laid-Open No. 57-160758,
As shown in Japanese Patent Publication No. 60-32410, a method has been proposed in which a magnetic plate is disposed on the floor of a vehicle to shield magnetic flux reaching the interior of the vehicle. Furthermore, in order to prevent the magnetic field from reaching passengers on the platform, a shielding method has been proposed in which a magnetic plate is placed on the wall of the platform.

[Problem to be solved by the invention]

However, the magnetic shielding method described in the above publication is insufficient because it cannot shield the magnetic flux that reaches from the side of the vehicle into the interior of the vehicle during normal driving off the platform. There is a problem in that it is not possible to prevent the influence of magnetic fields on cables and the like.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic shielding device capable of sufficiently shielding the magnetic field generated from the electromagnet of a magnetically levitated train from reaching the inside of the train and along the railroad tracks.

[Means to solve the problem]

The magnetic shielding device of the present invention includes at least one pair of vehicle-side electromagnets arranged symmetrically on both left and right sides of a lower part of the vehicle, and track-side electromagnets arranged on both sides of a track at positions facing the vehicle-side electromagnets. The magnetic shielding device for a magnetically levitated train is characterized by being provided with a magnetic shielding circuit that integrally includes the vehicle-side electromagnet and the ground-side electromagnet that face each other.

The magnetic shielding circuit may include a vehicle-side magnetic shield made of a magnetic material disposed at least above the vehicle-side electromagnet and on the opposite track side, and a vehicle-side magnetic shield body disposed at least above the track-side electromagnet and on the outside of the track. The vehicle-side magnetic shield may include a track-side magnetic shield made of a magnetic material, and the end portions of the vehicle-side magnetic shield and the vehicle-side magnetic shield may be magnetically coupled through an air gap.

Further, the magnetic shield circuit includes a vehicle-side magnetic shield body made of a magnetic material arranged to surround the vehicle-side electromagnet except for a surface of the vehicle-side electromagnet facing the track-side electromagnet; The vehicle-side magnetic shield is formed in a cylindrical shape and includes a track-side magnetic shield made of a magnetic material and arranged to surround the track-side electromagnet except for a surface of the electromagnet facing the vehicle-side electromagnet. The magnetic shield body and the end portion of the vehicle-side magnetic shield body may be magnetically coupled through a gap.

[Effect]

With this configuration, the magnetic flux generated by the vehicle-side electromagnet and the track-side electromagnet is surrounded by the magnetic shield circuit, so that most of the magnetic flux passes through the magnetic shield circuit. Therefore, the magnetic flux leaking to the outside of this magnetic shield circuit is significantly reduced. As a result,
Even at a position away from the platform, and even for the electromagnet on the opposite side of the platform, the magnetic field that reaches the passenger compartment, private houses along the railway line, communication cables, etc. can be sufficiently weakened, and the above object can be achieved.

In addition, since the vehicle-side electromagnet moves relative to the track-side electromagnet as the train runs, the above magnetic shielding circuit has two sections corresponding to the vehicle-side electromagnet and the track-side electromagnet, respectively.
By dividing the vehicle into two parts and magnetically coupling them through an air gap, the magnetic field can be effectively shielded without interfering with travel.

〔Example〕

The present invention will be explained below based on examples.

(First Embodiment) FIGS. 1 and 2 show the main parts of a magnetically levitated train equipped with a magnetic shielding device according to an embodiment of the present invention.

FIG. 1 is a sectional view of the vehicle and the track taken along a plane perpendicular to the direction of travel, and FIG. 2 is a side view. These figures show -
The magnetic levitation train includes a vehicle 1 and a track 2. The vehicle 1 includes a passenger compartment 3 constituting a passenger compartment, a superconducting electromagnet 4 mounted at the bottom of the passenger compartment 3, and auxiliary wheels 5 used at low speeds.

The superconducting magnets 4 are arranged, for example, at the front and rear ends of the vehicle 1, as shown in FIG. The track 2 has a roadbed 6 and a vehicle 1.
The guideway 7 is fixed on the roadbed 6 so as to be sandwiched between the guideways 7 and opposite to the left and right sides.

A floating guide coil 8, a propulsion coil 9, and the like are continuously arranged in the guideway 7 along the traveling direction of the vehicle 1.

The vehicle 1 of the magnetically levitated train constructed in this manner levitates from the state shown in the drawing due to the interaction between the superconducting electromagnet 4, the levitation guide coil 8, and the propulsion coil 9, and travels along the guideway 7. It looks like this. The magnetic field generated by the superconducting electromagnet 4 is strong for levitation and propulsion, and forms a strong magnetic field 1o that extends to the interior of the vehicle and the outside of the guideway 7, as shown in FIG. 3, for example.

If this continues, the magnetic field of 1o will cause damage to people inside the vehicle.

This is not desirable because private houses and communication cables outside of track 2 will be affected.

Therefore, in this embodiment, as shown in FIG. 1, a magnetic shield 11 on the vehicle side and a track are arranged to surround the superconducting electromagnet 4, the levitation guide coil 8, and the propulsion coil 9. A magnetic shielding circuit consisting of a side magnetic shielding body 12 is provided, and the magnetic flux of the magnetic field 10 is passed through the magnetic shielding circuit, thereby shielding the magnetic field from reaching the inside of the vehicle and outside along the railway. The magnetic shield body 11 surrounds the upper part, the anti-war path side, and the lower part of the superconducting electromagnet 4.
The magnetic shielding body 12 is made of a magnetic material, preferably a ferromagnetic material, and has a substantially U-shaped cross section so as to surround the upper side of the levitation guide coil 8 and the propulsion coil 9 on both sides and below. Become.

The opposing upper and lower ends of the magnetic shields 11 and 12 are magnetically coupled through an air gap, forming a magnetic shield circuit as a whole. The magnetic shield 12 on the track side is provided along the entire guideway 7. The magnetic shield 11 on the vehicle side is provided only at the superconducting electromagnet 4, as shown in FIG. Further, it is desirable that the magnetic shielding bodies 11 of adjacent vehicles be provided so as to extend to the connecting portion, since this increases the magnetic shielding effect.

As described above, according to this embodiment, the magnetic flux of the superconducting electromagnet 4 is attracted to the magnetic shield bodies 11.12 provided on the superconducting electromagnet 4 and the guideway 7, respectively, and the magnetic flux of the superconducting electromagnet 4 is attracted to the magnetic shield bodies 11. As a result, magnetic field leakage to the interior of the vehicle 1 and the outside of the guideway 7 can be almost eliminated. Moreover, the magnetic shield body 11 surrounding the superconducting electromagnet 4 mounted at the bottom of the vehicle 1 is
Even when moving together with the vehicle 1, the positional relationship between the guideway 7 and the magnetic shield 12 remains the same, and the structure always constitutes a closed magnetic circuit. , communication cables, etc. will not be adversely affected. In addition, as a simple magnetic shield structure,
There is also a method of attaching a magnetic shield to the inside of the vehicle compartment 2 to prevent the intrusion of the magnetic field, but since the magnetic field spreads over a wide range, attaching the magnetic shield has the disadvantage that the range becomes wider and the weight increases. In this regard, in this embodiment, only the superconducting electromagnet 4 is magnetically shielded, so that it is also possible to suppress an increase in weight.

In addition, in FIG. 1, the height direction positions of the upper ends of the magnetic shields 11 and 12 are misaligned, but when the vehicle 1 is in a normal running state with the vehicle 1 floating, they match. The magnetic field leaking upward from the guideway 7 is effectively reduced. Note that even if the heights of the magnetic shields 11 and 12 are made approximately the same, the effect does not change much.

(Second Embodiment) FIG. 4 shows another embodiment of this embodiment. This example is the first
This is a modification of the illustrated embodiment, and only one side of the symmetrical vehicle 1 and track 2 is shown. This embodiment differs from the embodiment shown in FIG. 1 in that the thickness t2 of the upper portion of the magnetic shields 11 and 12 near the compartment 3 is thicker than the thickness t1 of the other portions.

Another reason is that the distance d between the superconducting electromagnet 4 or the propulsion coil 9 and the vertical plate portion of the magnetic shield 11 or 12 is increased.

According to this embodiment, in addition to the effects of the embodiment shown in FIG. Saturation is less likely to occur.

As a result, it is possible to further reduce the leakage magnetic field to the vehicle interior and the outside of the guideway 7, especially to the platform.

Further, by increasing the distance d, the plate thickness t□ can be made thinner, and by decreasing the distance d, the plate thickness tY can be made thicker than the plate thickness t. That is, the plate thickness Ft2 is determined according to the magnetic flux density of the magnetic field to be shielded.

(Third Embodiment) FIG. 5 shows another embodiment of the present invention, which is a sectional view of the main parts, similar to the embodiment in FIG. The difference between this embodiment and the embodiment shown in Fig. 4 is that the plate thickness of the magnetic shielding bodies 11 and 12 was made uniform, and the horizontal plate portion on the road bed 6 side was deleted to make the gap larger than the upper part. There is a particular thing.

According to this embodiment, since the air gap at the lower end of the magnetic shielding body 11.12 is wide, the leakage magnetic flux 11 increases, but the
Since it is far away from the outside of the guideway 7, there is little increase in the influence of leakage magnetic fields, and the effect of reducing the weight of the magnetic shields 11 and 12 is rather large.

(Fourth Embodiment) FIG. 6 shows another embodiment of the present invention, which is a sectional view of the main parts, similar to FIG. 4. This embodiment differs from the embodiments shown in FIGS. 1 and 4 in that a magnetic shield 13 is provided from the upper end of the magnetic shield 11 to the side surface of the vehicle 1. The width of the magnetic shield 13 in the traveling direction is the same as that of the magnetic shield 12, and the width in the vertical direction is set to the middle height of the vehicle interior 3.

According to this embodiment, in addition to the effects of the embodiment of FIG. 1 or 2, the magnetic flux that could not be sufficiently absorbed by the magnetic shields 11 and 12 is almost completely absorbed by the magnetic shield body 13.
It is possible to shield the magnetic field that reaches the passenger compartment.

(Fifth Embodiment) FIG. 7 shows another embodiment of the present invention. This embodiment is a modification of the embodiment shown in FIGS. 1 and 2, and the differences are as follows.
This is an example in which the magnetic shield 11 of the connecting portion is shortened to cover only the superconducting electromagnet 4.

According to this embodiment, the magnetic shielding body 1 serving as a load for levitation
1 can be reduced in weight, and the amount of cooling medium can also be reduced. Furthermore, since the magnetic shield body 11 is made smaller, maintenance can be easily performed when the superconducting electromagnet 4 is quenched.

(Sixth Embodiment) FIG. 8 shows still another embodiment of the present invention. This embodiment differs from the embodiment shown in FIGS. 1 and 2 in that a magnetic shield made of a magnetic plate is provided over the entire surface of the door 14 provided on the side of the vehicle 1. As shown in FIG. 9, the door 14 is opened and closed by rotating with the lower part as a fulcrum.

Therefore, according to this embodiment, when the boarding door 14 is opened, as shown in FIG.
magnetically coupled with. This allows a person to move toward the guideway 7 side without being affected by the magnetic field even in abnormal situations or when getting on and off the vehicle. Moreover, by adopting such a magnetic shield structure, it is possible to protect people from the influence of magnetic fields even in places where there are many people, such as platforms.

(Seventh Embodiment) FIGS. 10 to 12 show specific examples of the magnetic shielding bodies 11 and 12 of each of the above embodiments.

The magnetic shield body 11 (or 12) shown in FIG.
In order to increase the shielding effect, a large number of thin magnetic plates are laminated to form a roughly U-shape.

According to this embodiment, compared to a magnetic shield formed by laminating a large number of magnetic materials in one piece, the shielding effect is improved because air gaps are created between the magnetic materials, which increases the overall magnetic resistance and makes it difficult to magnetically saturate. will improve. The magnetic shielding bodies 11 and 12 may be manufactured by laminating a large number of magnetic bodies and then integrally molding them, or by performing a manufacturing process in which thin magnetic bodies are individually molded and then integrated, without any particular problem.

Furthermore, the same shielding effect can be expected even if the magnetic shield is made by putting magnetic powder into a mold and molding it, or by molding it.

What is shown in FIG. 11 is a specific example of the magnetic shielding body 12 on the guideway 7 side.As shown in FIG. A slit 15 is provided to reduce eddy current. As a result, the eddy current flowing through the magnetic shield body 12 due to the magnetic flux of the superconducting electromagnet 4 can be reduced, and the braking force generated by this eddy current can be reduced, thereby preventing a reduction in the propulsive force.

In the case shown in FIG. 12, the thin plates of the embodiment shown in FIG. 11 are laminated in the direction of travel, with the lamination direction different by 90 degrees.

According to this embodiment, the eddy current flowing in the magnetic shielding body 12 of the guideway 7 due to the leakage magnetic field from the superconducting electromagnet 4 can be further divided into smaller parts, and as a result, the drag force generated by the eddy current can also be reduced, so that the propulsion force can be reduced. This can be prevented.

In addition, the magnetic shield bodies 11 and 12 in FIGS. 10 to 12
Since the magnetic shields 11 and 12 have a laminated structure, the mechanical strength and reliability of the magnetic shields 11 and 12 can be improved by bonding the thin plates using an adhesive containing a corrosion inhibitor. Further, the magnetic shielding body 12 may be attached by embedding the entire body in the guideway 7, or by fixing it to the surface of the guideway 7 using, for example, bolts or supporting metal fittings.

〔Effect of the invention〕

As explained above, according to the magnetic shielding device of the present invention, since the magnetic shielding circuit that integrally surrounds the vehicle side electromagnet and the track side electromagnet is provided, most of the magnetic flux generated from the superconducting electromagnet is , passes through the magnetic shield circuit, and the magnetic flux leaking to the outside of the magnetic shield circuit can be significantly reduced. As a result, in addition to the platform, the influence on the vehicle interior, private houses along the railway line, and communication cables can be eliminated all at once.

Further, a vehicle-side magnetic shield body made of a magnetic material in which the magnetic shielding circuit is arranged at least above the vehicle-side electromagnet and on the opposite side of the track, and a track-side magnetic shield made of a magnetic material arranged at least above the track-side electromagnet and on the outside of the track. If the magnetic shield body is divided into a magnetic shield body and the end portions of the vehicle-side magnetic shield body and the vehicle-side magnetic shield body are magnetically coupled through an air gap, the influence of leakage magnetic fields is particularly problematic. It is possible to effectively prevent the impact on the inside of the vehicle, private houses along the railway line, communication cables, etc., and reduce the weight of the floating vehicle.

Furthermore, if a magnetic shield made of a magnetic material is provided extending from the upper end of the vehicle-side magnetic shield to the side surface of the vehicle, leakage of magnetic flux into the vehicle interior can be more effectively shielded.

In addition, if the track-side magnetic shield is formed by laminating thin magnetic plates in the direction of travel, or if it is provided with slits perpendicular to the direction of travel, the braking action is reduced due to the eddy current reduction effect. It can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional configuration diagram of one embodiment of the present invention, and FIG.
3 is an explanatory diagram showing the magnetic field distribution formed by the superconducting coil of the embodiment in FIG. 1, and FIGS. 4 to 9 are configuration diagrams of main parts of other embodiments of the present invention, respectively. , and FIGS. 10 to 12 are perspective views of the construction of embodiments of the magnetic shielding body according to the present invention. 1... Vehicle, 2... Track, 3... Vehicle interior, 4...
・Superconducting electromagnet, 71. , guideway, 8... levitation guide coil, 9... propulsion coil, 11, 12, 1
3...Magnetic shielding body, 14...Getting on/off door, 15...
··slit.

Claims (18)

[Claims] 1. A magnetic shielding device for a magnetically levitated train, comprising at least one pair of vehicle-side electromagnets arranged symmetrically on both left and right sides of the lower part of the vehicle, and track-side electromagnets arranged on both sides of the track at positions facing the vehicle-side electromagnets. A magnetic shielding device for a magnetic levitation train, characterized in that a magnetic shielding circuit is provided that integrally includes the vehicle-side electromagnet and the ground-side electromagnet that face each other. 2. The magnetic shielding circuit includes a vehicle-side magnetic shield made of a magnetic material disposed at least above the vehicle-side electromagnet and on the opposite track side, and a magnetic material disposed at least above the track-side electromagnet and on the outside of the track. A magnetic shield according to claim 1, further comprising: a track-side magnetic shield, and an end portion of the vehicle-side magnetic shield and the vehicle-side magnetic shield are magnetically coupled through a gap. Magnetic shielding device for floating trains. 3. The magnetic shield circuit includes a vehicle-side magnetic shield body made of a magnetic material and arranged to surround the vehicle-side electromagnet except for a surface of the vehicle-side electromagnet facing the track-side electromagnet; A track-side magnetic shield made of a magnetic material is arranged to surround the track-side electromagnet except for the surface facing the vehicle-side electromagnet. 2. The magnetic shielding device for a magnetically levitated train according to claim 1, wherein ends of the vehicle-side magnetic shielding body are magnetically coupled through an air gap. 4. The magnetic levitation train according to claim 2, wherein the vehicle-side magnetic shield body and the track-side magnetic shield body are formed such that an upper end portion thereof is thicker than other portions. Magnetic shielding device. 5. The vehicle-side magnetic shield body and the track-side magnetic shield body are formed such that the gap formed at their upper ends is narrower than the gap formed at their lower ends. A magnetic shielding device for a magnetically levitated train according to any one of claims 2, 3 and 4. 6. 6. The magnetic shield device for a magnetic levitation train according to claim 2, wherein the vehicle-side magnetic shield body is attached to the vehicle. 7. The vehicle-side electromagnet is provided at a lower part of the vehicle,
Claim 1, wherein the track-side electromagnet is provided on a guideway disposed opposite to a lower part of the vehicle.
, 2, 3, 4, 5, or 6. The magnetic shielding device for a magnetic levitation train according to any one of . 8. Claims 1, 2, 3, 4, 5, and 6, wherein the vehicle-side electromagnet is provided at a lower portion of the front and rear ends of the vehicle.
, 7. The magnetic shielding device for a magnetic levitation train according to any one of 7. 9. 9. The magnetic levitation train according to claim 8, wherein opposing ends of the vehicle-side magnetic shield body and the vehicle-side magnetic shield body of another vehicle to be connected are provided close to each other. shield device. 10. Claims 2, 3, 4, 5, 6, 7, characterized in that a magnetic shield made of a magnetic material is provided extending from an upper end of the vehicle-side magnetic shield to a side surface of the vehicle.
8. The magnetic shielding device for a magnetically levitated train according to any one of 8 and 9. 11. At least a part of the door of the vehicle opens and closes by rotating with a lower part as a fulcrum, and the rotating part of the door includes a magnetic shield made of a magnetic material. Claims 1, 2, 3,
The magnetic shielding device for a magnetic levitation train according to any one of 4, 5, 6, 7, 8, 9, and 10. 12. Claims 2, 3, 4, wherein the magnetic shield body is formed by laminating thin plates made of magnetic material.
5, 6, 7, 8, 9, 10, and 11. The magnetic shielding device for a magnetically levitated train. 13. Claim 1, wherein the laminated surfaces of the thin plates of the magnetic shield are parallel to the traveling direction of the vehicle.
2. The magnetic shielding device for a magnetically levitated train according to item 2. 14. 14. The magnetic shielding device for a magnetically levitated train according to claim 13, wherein a slit is formed in the magnetic shield body and extends perpendicularly to the traveling direction of the vehicle. 15. Claim 1, wherein the laminated surfaces of the thin plates of the magnetic shield are perpendicular to the traveling direction of the vehicle.
2. The magnetic shielding device for a magnetically levitated train according to item 2. 16. In a magnetically levitated train vehicle having at least a pair of vehicle-side electromagnets arranged symmetrically on both left and right sides of the lower part of the vehicle, a vehicle-side magnet made of a magnetic material disposed at least above and on the opposite track side of the vehicle-side electromagnets. A magnetic levitation train vehicle characterized by having a shield body. 17. A magnetic shield for a magnetically levitated train, comprising at least one pair of vehicle-side electromagnets arranged symmetrically on the left and right sides of the lower part of the vehicle, and track-side electromagnets arranged on both sides of the track at positions facing the vehicle-side electromagnets. In the device, a magnetic shielding circuit is provided which integrally includes the vehicle-side electromagnet and the ground-side electromagnet that face each other, and the magnetic shielding circuit includes a vehicle-side magnetic field made of a magnetic material arranged so as to surround the vehicle-side electromagnet. and a track-side magnetic shield made of a magnetic material arranged so as to surround the track-side electromagnet, and the two magnetic shields are magnetically coupled through an air gap, and the track-side electromagnet is magnetically coupled to the vehicle. A magnetic shielding device for a magnetic levitation train, wherein a side magnetic shield body is formed to work together with the vehicle. 18. It is divided into a vehicle-side magnetic shield body and a track-side magnetic shield body made of magnetic material so as to integrally surround the vehicle-side electromagnet and the track-side electromagnets placed on both sides of the track at positions facing the vehicle-side electromagnet. 1. A magnetic shielding body for a magnetically levitated train, the magnetic shielding body being formed by laminating thin plates made of magnetic material.