JPH04289704A - Levitation guide coil - Google Patents

Abstract

PURPOSE:To enhance durability of lavitation guide coil by relaxing stress concentrated at a rail fixing part when a magnetic levitation vehicle travels. CONSTITUTION:Adjacent levitation guide coils 8 are coupled through spacers in order to cancel reactions in different directions between the coils 8 thus relaxing the stress in the coil.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a levitation guide coil for magnetic levitation type railways.

0003

BACKGROUND OF THE INVENTION At present, the development of magnetically levitated railway vehicles using superconducting magnets is progressing, and various tests using experimental lines are beginning to give prospects for their practical application. The current levitation guide coils shown in FIGS. 9 to 11 will be explained.

A car body 1 of a magnetic levitation railway is supported on a bogie frame 3 via lower left and right air springs 2, 2. Superconducting magnets 4, 4 are attached to both left and right sides of the bogie frame 3. Propulsion coils and levitation guide coils, collectively referred to as ground coils, are arranged on both side tracks 5, 5 of the U-shaped cross-sectional track on the ground side at positions facing the superconducting magnets 4, 4. As for the propulsion coils, first layer propulsion coils 6, 6 are attached to the bottom side of a recessed part inserted inside the concrete tracks 5, 5, and second layer propulsion coils 7, 7 are attached to the vehicle side in front of the first layer propulsion coils 6, 6. Further, levitation guide coils 8, 8 are disposed in front of the second layer propulsion coils 7, 7, at positions facing the superconducting magnets 4, 4 of the bogie frame 3, respectively, along the traveling direction of the vehicle.

Furthermore, for running at low speeds where the floating force of the vehicle body 1 is insufficient, guide wheels 9, 9 are mounted on both sides of the bogie underframe 3 in contact with the side walls of the tracks 5, 5. Running wheels 10, 10 are provided at both ends of the bottom of the vehicle 3, and the vehicle runs on tracks 11, 11 laid at the bottom of the U-shaped track.

When attaching the propulsion coils to the track 5, the first layer propulsion coil 6 and the second layer coil 7 are attached with a difference of half a pitch (P/2), where P is the mounting pitch. Similarly, the levitation guide coils 8 are installed at a pitch (P/2) that is half the installation pitch of the propulsion coils.

[0007] Coil openings 12, 12 are provided at the lower center portions of each of the first layer propulsion coil 6 and the second layer propulsion coil 7 to receive power supply from the outside. Like the propulsion coils, these propulsion coil outlets 12 and 12 are also provided shifted by half a pitch, and are arranged so that they are positioned alternately. A bank notch 14 is provided to avoid this. The levitation guide coil 8 is installed on the upper and lower track banks 13 and the central mounting bank 15.
It is fixed to the surface with a coil mounting bolt 16.

[0008]

[Problem to be solved by the invention] In magnetic levitation railways configured as described above, as the vehicles become larger and faster, the reaction force to the ground-side magnetic coil, especially the reaction force to the levitation guide coil, increases. As a result, the stress around the orbital attachment portion of the levitation guide coil inevitably increases, so it is necessary to increase the mechanical strength or alleviate the stress.

Furthermore, since the levitation guide coil itself is constantly exposed to the outside air, especially wind and rain, even the slightest crack can lead to dielectric breakdown, so it is necessary to increase the strength of the magnetic coil.
Stress relaxation has become an important issue.

[0010] In order to strengthen the magnetic coil, it is difficult to increase the mechanical strength of the insulator covering the coil.
It is possible to increase the strength of the entire magnetic coil by increasing the thickness of the insulating layer to improve the rigidity. However, if this is done, the mechanically permissible gap between the superconducting coil on the vehicle side and the superconducting coil will be reduced.If the mechanical gap is maintained, the superconducting coil will be reduced by the increase in the levitation guide coil insulating layer. This results in an increase in the distance between the two and a decrease in the floating guiding force.

Next, increasing the number of coil mounting bolts is an easy way to alleviate the stress at the coil mounting bolts where the reaction force generated in the levitation guide coil is high. Two layers of propulsion coils are arranged in a complicated manner between the tracks, and the space for bolt mounting holes is limited, making it difficult to increase the number of coil mounting bolts. Further, instead of the above method, attaching a large number of small diameter bolts while avoiding the conductor portions of the propulsion coil and the levitation guide coil significantly reduces work efficiency and is impractical.

Furthermore, since the position of the coil mounting bolt around the propulsion coil outlet on the lower side of the track bank is restricted by the bank notch, the stress in the surrounding insulating part tends to be high.

In view of the above, the present invention determines the coil mounting bolt position of the levitation guide coil in consideration of the reaction force of the superconducting coil, equalizes the load on each coil mounting bolt, and reduces stress around the mounting bolt. The object of the present invention is to provide a structure of a levitation guide coil that can cope with the increase in levitation reaction force that accompanies larger and faster vehicles.

[Configuration of the invention]

[0015]

[Means for Solving the Problems] In order to achieve the above object, the present invention forms a recess at the lower corner of the levitation guide coil in contact with an adjacent coil, and provides a non-ferrous, non-magnetic material that fits into the recess. A convex reinforcing spacer made of material is inserted to interconnect adjacent levitation guide coils. The reinforcing spacer is fixed to the track with bolts.

[0016]

[Operation] The reaction force of the levitation guidance force exerted by the superconducting coil on the vehicle side acts on the ground side levitation guide coil, but the reaction force acting on the adjacent levitation guide coil has the opposite phase due to electromagnetic relationship, and the force The directions are necessarily opposite.

[0017] Therefore, by inserting a reinforcing spacer into the lower recess between adjacent levitation guide coils and connecting them, the forces acting mutually in the opposite directions are canceled out through the reinforcing spacer, so that the levitation guide coils A part of the load on the coil mounting bolt is offset, and the stress on the bolt mounting part can be alleviated.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The levitation guide coil of the present invention will be explained based on the embodiments shown in FIGS. 1 to 6.

Superconducting magnets 4, 4 are attached to both left and right sides of the bogie frame 3 of the magnetically levitated railway, and on both side wall tracks 5, 5 of the U-shaped section track on which the vehicle runs, there are magnets 4, 4 opposite to the superconducting magnets 4, 4. Then, the levitation guide coils 8, 8 are attached along the vehicle traveling direction. The levitation guide coil 8 is superimposed on the first and second layer propulsion coils 6 and 7 attached to the inside of the track 5, and is fixed to the mounting bank 15 in the center and the upper and lower track banks 13, 13.

Coil recesses 17 are provided at both corners of the lower part of the levitation guide coil 8 and the portion where the adjacent coil contacts. A non-ferrous, non-magnetic FRP reinforcing spacer 18 formed in a convex shape to fit into the coil recess 17 is inserted into the coil recess 17 and fixed with a spacer mounting bolt 19, and the adjacent floating guide coils 8, 8 are fixed together. Concatenate.

[0021] When the vehicle is running on the levitation, the forces F1 and F2 acting on the coil recesses 17 of the adjacent levitation guide coils 8 and 8 always change as the vehicle runs, but the magnitudes of the forces F1 and F2 are approximately are the same. However, the acting forces F1, F
2, since the directions of current in adjacent coils are different, they act in opposite directions due to electromagnetic relationships.

[0022] The coil recess 17 of the levitation guide coils 8, 8;
When the reinforcing spacer 18 is inserted and fitted into the coil recess 17, the forces F1 and F2 acting on the recess 17 of the coil are mutually canceled out through the reinforcing spacer 18, and therefore the coil recess 17
A part of the load on the coil mounting bolt 16 is canceled out, and the stress on the same part can be alleviated.

In the example shown in FIGS. 7 and 8 as another embodiment of the present invention, a concave reinforcing spacer 20 is formed in place of the reinforcing spacer 18 described above, and is inserted into both lower corners of the floating guide coils 8, 8. , connects adjacent levitation guide coils 8, 8 to each other. As a result of the above, the forces F1 and F2 generated at the connection portion are canceled out, the load on the coil attachment bolt 16 is reduced, and the stress on the bolt attachment portion can be alleviated as in the previous embodiment.

[0024]

[Effects of the Invention] With the structure of the present invention, the stress of the reaction force applied to the levitation guide coil for a magnetically levitated railway vehicle can be alleviated, dielectric breakdown can be prevented, and the coil installation is relatively easy, low cost, and highly workable. It becomes a method. Therefore, it is possible to provide a levitation guide coil that can accommodate larger and faster vehicles for practical use.

[Brief explanation of the drawing]

FIG. 1 is a front view of a levitation guide coil according to the present invention.

FIG. 2 is a partially enlarged perspective view of FIG. 1;

FIG. 3 is a front view of a floating guide coil equipped with a reinforcing spacer according to the present invention.

FIG. 4 is a perspective view of a reinforcing spacer according to the invention;

[Figure 5]
FIG. 6 is a front view illustrating the direction of force acting on the levitation guide coil recess.

FIG. 6 is a perspective view illustrating the direction of force acting on the levitation guide coil recess.

FIG. 7 is a front view showing another embodiment of the present invention.

FIG. 8 is a partial cross-sectional view of FIG. 7;

FIG. 9 is a cross-sectional view of the magnetic levitation railway.

FIG. 10 is a perspective view of a conventional example of a ground coil.

FIG. 11 is a front view of a conventional levitation guide coil.

[Explanation of symbols]

Claims (1)

[Claims] Claim 1: A levitation guide that is continuously arranged along the running direction on both side walls of a track on which a magnetically levitated railway vehicle runs, and that generates a levitation guiding force in opposition to a superconducting magnet mounted on the vehicle bogie side. The coil is characterized in that the lower corner of the levitation guide coil that contacts the adjacent levitation guide coil is formed into a concave shape, and is connected to the adjacent levitation guide coil by a non-metallic, non-magnetic spacer that fits into the concave portion. Levitation guide coil.