JPH0358001B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field to which the Invention Pertains] The present invention relates to a magnetic levitation railway, and particularly to a track in an induced repulsion type magnetic levitation railway in which powerful electromagnets such as superconducting electromagnets are mounted on the train.

[Prior art and its problems]

BACKGROUND ART Conventionally, U-shaped or inverted T-shaped tracks have been considered as suitable as tracks for guided repulsion type magnetic levitation railways. FIG. 1 schematically shows an example of a conventional configuration of a U-shaped track, and shows a vehicle 1 equipped with a powerful electromagnet running on a U-shaped track 2. . On the side walls and bottom of the track, reinforcing bars 3 installed in the direction of vehicle travel and reinforcing bars 4 installed perpendicular to the direction of travel are arranged in a mesh pattern at appropriate intervals, and each intersection is connected with wire. etc., and are embedded in concrete to maintain the mechanical strength of the track. Figure 2 shows a cross section of the U-shaped track and the vehicle, where a powerful electromagnet 5 mounted on the vehicle
When a current supplied from an external power source (not shown) flows through the propulsion guide coil 6 attached to or embedded in the track, it receives thrust, and as it travels in the direction of travel, the levitation coil attached to or embedded in the bottom of the track A current is induced in 7, and due to electromagnetic interaction with the electromagnet 5 on the vehicle, a levitation force corresponding to the weight of the vehicle is obtained, and the vehicle travels levitating. A reinforcing bar mesh is embedded in the side wall so as to support the force in the guidance direction that the propulsion guide coil receives from the vehicle and the force that it receives as a reaction to the thrust force. In particular, in the part of the side wall that faces the electromagnet on the car, the magnetic flux density becomes quite large even in the part of the reinforcing bar network, and a kind of electric circuit is formed in the reinforcing bar network, inducing a large current. This current generates joule loss in the reinforcing steel. This joule loss occurs when the vehicle is running, and from the perspective of the vehicle, it means an increase in running resistance. The value of this running resistance is 30 to 40% of the air resistance at high speeds, creating the problem that the power supply capacity required for high-speed operation of the vehicle inevitably increases.

FIG. 3 shows a conventional example of an inverted T-shaped track, a cross section of a vehicle, and the arrangement of reinforcing bars in the cross section, and it can be seen that the problems described above for the U-shaped track also occur in the inverted T-shaped track.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a track for a magnetic levitation railway that reduces running resistance caused by a reinforcing bar network without impairing the mechanical strength required of the track.

[Summary of the invention]

FIG. 4 is a diagram showing an example of the positional relationship between the conventional on-board electromagnet 5 and the reinforcing bar networks 3 and 4 in the track. Conventionally, as shown in FIG. 4, the reinforcing bars 3 in the traveling direction were arranged at equal intervals on a reinforcing bar mesh surface, and each intersection with the reinforcing bars 4 perpendicular to the traveling direction was fixed with wire or the like. On the other hand, FIG. 5 shows the distribution of the magnetic field component perpendicular to the reinforcing bar mesh generated on the surface of the reinforcing bar mesh by the on-board electromagnet 5 in the direction perpendicular to the traveling direction. From Figure 5, when reinforcing bars are placed at equal intervals in the advancing direction, the voltage induced in each mesh circuit created by the reinforcing bar network is larger as the mesh circuit is closer to the point facing the center of the electromagnet, and It can be seen that the voltage becomes smaller. In addition, the joule loss that occurs at each reinforcing bar and at the intersection of the reinforcing bars is proportional to the square of the difference in current between adjacent mesh circuits, so in order to reduce the joule loss, it is necessary to reduce the difference in current between adjacent mesh circuits. It is presumed to be effective. Therefore, it can be seen that it is desirable that the installation spacing of the reinforcing bars in the advancing direction is inversely proportional to the magnetic flux distribution curve shown in FIG.

However, the primary purpose of installing reinforcing bars is to guarantee the mechanical strength of the track, and installing reinforcing bars at equal intervals has considerable advantages in terms of ease of installation work. be. Therefore, the reinforcing bars in the traveling direction are installed at equal intervals, and a part of the reinforcing bars 3' in the traveling direction away from the point facing the center of the on-board electromagnet is electrically insulated from the vertical reinforcing bars 4 and fixed. By increasing the ratio of the vertical reinforcing bars 4 and the reinforcing bars 3' fixed and electrically insulated from the vertical reinforcing bars 4 as you move away from the point facing the center of the electromagnet, a magnetically levitated railway track with low running resistance can be created. can get.

〔Effect of the invention〕

FIG. 6 shows an embodiment of the present invention. This example:
This is an example in which the conventional embodiment shown in FIG. 4 is electrically insulated and fixed to vertical reinforcing bars 4, one each at the top and bottom, at positions away from the point facing the on-board electromagnet.

Figure 7 shows the speed characteristics of the Joule loss due to the reinforcing bar network in the conventional embodiment shown in Fig. 4 (a in Fig. 7) and the velocity characteristic of Joule loss due to the reinforcing bar network in the embodiment of the present invention shown in Fig. 6. The speed characteristics (b in Fig. 7) are shown.

As described above, according to the present invention, it is possible to obtain a track for a magnetically levitated iron railway that has low running resistance caused by wheel loss caused by a reinforcing bar network, without impairing the mechanical strength of the track, and which is capable of providing the drive required for high-speed running. The capacity of the power supply can be reduced.

[Embodiments of the invention]

FIG. 6 shows one of the simplest embodiments of the invention. Furthermore, FIG. 8 shows another embodiment of the present invention. In this embodiment, as the distance from the point facing the center of the on-board electromagnet increases, the proportion of the number of reinforcing bars 3' in the traveling direction that electrically insulate and fix the intersections with the vertical reinforcing bars 4 increases. The number of reinforcing bars 3 in the advancing direction is electrically connected and fixed at the intersection with the reinforcing bars 3. In this way, by changing the connection method of the intersections of reinforcing bars so that the magnetic fluxes created by the on-board electromagnets that intersect with each mesh circuit of the reinforcing bar network are almost equal, magnetic levitation trains with low running resistance can be created. can provide a trajectory for

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional embodiment, Fig. 2 is a sectional view of a conventional embodiment, Fig. 3 is a sectional view of another conventional embodiment, and Fig. 4 explains one conventional embodiment. An explanatory diagram, FIG. 5 is a characteristic diagram showing the magnetic flux density distribution in this embodiment, FIG. 6 is an explanatory diagram showing an embodiment of the present invention, and FIG. 7 is a running diagram in the conventional embodiment and the embodiment of the present invention. A characteristic diagram for comparing resistances, FIG. 8 is an explanatory diagram showing another embodiment of the present invention. 3...Advancing direction reinforcing bars whose intersections with vertical reinforcing bars 4 are electrically connected and fixed, 3'...vertical reinforcing bars 4
4... Vertical reinforcing bars, 5... Electromagnets mounted on the vehicle, 6... Propulsion guide coils, 7... Levitation coils.

Claims (1)

[Claims] 1. In a plane approximately parallel to the surface of the electromagnet attached to the magnetically levitated vehicle, the direction of travel of the vehicle and
Consisting of multiple reinforcing bars each installed in a direction approximately perpendicular to the direction of travel, reinforcing bars arranged in the direction of travel are installed at appropriate intervals in a direction perpendicular to the direction of travel, and reinforcing bars in the direction perpendicular to the direction of travel In a magnetic levitation railway track connected by wire, etc. at the intersection with the train, there is a reinforcing bar in the direction of travel that faces and is close to the electromagnet on the train, and a reinforcing bar in a direction perpendicular to this. For reinforcing bars located far away from the electromagnet in the direction of travel, the intersections with reinforcing bars in the direction perpendicular to this shall be electrically coupled. Direction reinforcing bars and fixed advancing direction reinforcing bars that are electrically insulated are arranged alternately, and the proportion of advancing direction reinforcing bars whose intersections are electrically insulated increases as the distance from the electromagnet increases. Magnetic levitation railway track.