JPS59106602A - Track for magnetic float railroad - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field to which the Invention Pertains] The present invention relates to a track in a magnetic levitation railway, particularly 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] Conventionally, a U-shaped or inverted T-shaped track has been considered as suitable for an induced repulsion type magnetic levitation railway. 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. There are reinforcing bars 3 installed in the direction of vehicle movement on the side walls and bottom of the track.
Reinforcing bars 4 installed in a direction perpendicular to the direction of travel are arranged in a mesh pattern at appropriate intervals, and each intersection is fixed with wire, etc., and is embedded in concrete to maintain the mechanical strength of the track. are doing. Figure 2 shows a cross section of a U-shaped track and a vehicle, in which a powerful electromagnet 5 mounted on the vehicle is connected to a propulsion guide coil 6 attached to or embedded in the track with an external power source (not shown). When the vehicle receives thrust due to the flow of the supplied current and travels in the direction of travel, a current is induced in the levitation coil 7 attached to or embedded in the bottom of the track, and the current is induced between the levitation coil 7 and the electromagnet 5 on the vehicle. Due to the electromagnetic interaction between the two, a levitation force corresponding to the weight of the vehicle is obtained, and the vehicle travels levitating. A reinforcing bar net is embedded in the side wall so that the propulsion guide coil can support the force in the guidance direction received from the vehicle as well as the force received 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 is small even in the part of the reinforcing bar network, and a large current is induced in the electric circuit made up of the reinforcing bar network. This current generates Zeel losses in the reinforcing steel. This gyr loss is caused by the running of the vehicle, and from the perspective of the vehicle, it means an increase in running resistance. The value of this running resistance is 30-40% of the air resistance at high speeds, and the power supply capacity required for high-speed operation of vehicles has to increase.Figure 3 shows an inverted T-shaped track and a vehicle. This figure shows a conventional example of the arrangement of reinforcing bars in a cross section, and it can be seen that the problems described above for the U-shaped track also occur for the inverted T-shaped track.

[Object 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 for the track. .

[Overview of the Invention] Fig. 4 shows a conventional on-board electromagnet 5 and a reinforcing bar network 3, 4 in the track.
It is a figure which shows an example of the positional relationship of. Conventionally, as shown in Fig. 4, the reinforcing bars 3 in the advancing direction are arranged at equal intervals on the reinforcing bar mesh surface.
The reinforcing bars 4 perpendicular to the direction of movement and each intersection were 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. As shown in 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 as follows: It can be seen that the induced voltage becomes smaller. In addition, the Joule loss that occurs at each reinforcing bar section and at the intersection of reinforcing bars is proportional to the square of the difference in current between adjacent mesh circuits, so in order to reduce Joule loss, it is necessary to reduce the difference in current between adjacent mesh circuits. It is presumed to be effective. Therefore, the installation interval of reinforcing bars in the advancing direction is 5th
It can be seen that it is desirable to set the spacing to be inversely proportional to the magnetic flux distribution curve shown in the figure.

However, the primary purpose of installing reinforcing bars is to guarantee the mechanical strength of the track, and also from the viewpoint of ease of installation work, it is difficult to install reinforcing bars at equal intervals. There are several advantages. 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 onboard electromagnet is electrically insulated from and fixed to the vertical reinforcing bar 4, and the onboard electromagnet is fixed. By increasing the ratio of reinforcing bars 3' in the traveling direction, which are fixed and electrically insulated from the vertical reinforcing bars 4, as you move away from the point facing the center of the track, a magnetic levitation railway track with low running resistance can be obtained. It will be done.

[Effects of the Invention] FIG. 6 shows an embodiment of the present invention. This example 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 a position away from the point facing the on-board electromagnet. be.

Figure 7 shows the speed characteristics of the Joule loss due to the reinforcing bar network in the conventional embodiment shown in Figure 4 (a in Figure 7) and the Joule loss velocity characteristic due to the reinforcing bar network in the embodiment of the present invention shown in Figure 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 railway that has low running resistance caused by Zeal loss caused by a reinforcing bar network without impairing the mechanical strength of the track, and it is possible to obtain a track for a magnetically levitated railway that has low running resistance caused by Zeal loss caused by a reinforcing bar network, and to reduce the need for a drive power source that is essential for high-speed running. Capacity can be reduced.

[Embodiment of the Invention] FIG. 6 shows one of the simplest embodiments of Kinoe and Akira. Furthermore, FIG. 8 shows another embodiment of the present invention. this! ! : M
In example J, the ratio of the number of reinforcing bars 3' in the traveling direction, which are electrically insulated and fixed at the intersection with the vertical reinforcing bars 4 as they move away from the opposite point of the center of the to and m stones on the car, is:
The number of reinforcing bars 3 in the advancing direction is greater than the number of reinforcing bars 3 in the advancing direction whose intersections with vertical reinforcing bars 4 are electrically connected and fixed. In this way, by changing the connection method of the intersections of the reinforcing bars so that the magnetic fluxes created by the on-board stones that interlink with each mesh circuit of the reinforcing bar network are almost equal, running resistance is reduced. Tracks for maglev trains can be provided.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional embodiment, FIG. 2 is a sectional view of the conventional embodiment, and FIG. 3 is a sectional view of another conventional embodiment [phase 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. FIG. A characteristic diagram comparing the running resistance in the embodiment and the embodiment of the present invention, and FIG. 8 is an explanatory diagram showing another embodiment of the present invention. 3...Progressing direction reinforcing bars whose intersecting parts with vertical reinforcing bars 4 are electrically connected and fixed, 3'...progressing direction reinforcing bars whose intersecting parts with vertical reinforcing bars 4 are electrically insulated and fixed. Reinforcing bars, 4... Straight reinforcing bars, 5... Electromagnets mounted on the vehicle, 6... Propulsion coils, 7... Levitation coils. Figure 1 Figure 2 Figure 3 Figure 4 Figure 2 Figure 5 Figure 7 Figure 8 L to L)
t Muno procedure amendment (voluntary) 1. Display of $1.1988 Patent Application No. 213305 2 Title of invention Magnetic levitation railway track 3 Relationship with the person making the amendment case Patent applicant (307 ) Tokyo Shibaura Electric Co., Ltd. 4, Agent Address: 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo 100-2 Tokyo Shibaura Electric Co., Ltd. Tokyo Office (1) Specification (2) Drawings 6, Contents of amendment (II Specification) On page M8, line 7, "6...propulsion plan coil" is corrected to "6...propulsion guide coil".

Claims (1)

[Claims] Reinforcement bars arranged in the direction of travel, consisting of multiple reinforcing bars installed in the direction of travel of the vehicle and in a direction approximately perpendicular to the direction of travel, in a plane approximately parallel to the plane of the electromagnet attached to the magnetically levitated vehicle. Magnetic levitation railway tracks are installed at appropriate intervals in a direction perpendicular to the direction of travel, and are connected with wire etc. at the intersections with reinforcing bars in the direction perpendicular to the direction of travel. 1, and a reinforcing bar in the direction of movement located close to the electromagnet,
The intersections with reinforcing bars in the direction perpendicular to this are connected and fixed so as to be electrically connected, and for the reinforcing bars in the direction of travel that are distanced from xi4, the intersections with reinforcing bars in the direction perpendicular to this are connected and fixed. The reinforcing bars electrically connected to the moving direction and the reinforcing bars fixed so as to be electrically insulated are arranged alternately, and the reinforcing bars in the moving direction are electrically insulated at the intersections by placing them at a distance from the electromagnet. Characterized by increasing the proportion of reinforcing bars &%0 track for bar-top railways