JPS5915470B2 - Levitation device in superconducting magnetic levitation railway - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ground coil for levitation in a superconducting magnetic levitation railway.

Figure 1 shows an example of the configuration of an on-board superconducting magnet (hereinafter referred to as SCM), a ground coil for levitation (hereinafter referred to as a levitation coil), and a ground coil for propulsion guidance (hereinafter referred to as an inference coil) in a superconducting magnetic levitation railway. This is a cross-sectional view perpendicular to the direction of vehicle travel, generally called a U-shape, and 1
2 is the vehicle body, 2 is the propulsion guide SCM fixed to the vehicle body 1, and 3 is the vehicle body.
4 is a levitation SCM fixed to the vehicle body 1, 4 is a track, 5 is a levitation coil laid on the track 4, and 6 is an inference coil laid on the track 4.

Are the propulsion guide SCM 2 and inference coil 6 linear synchronous motors? The vehicle body 1 is propelled by energizing the estimation coil 6 with a propulsion current corresponding to the positional relationship between the propulsion guide SCM 2 and the estimation coil 6.

At this time, a current is induced in the levitation coil 5 by the electromagnetic induction effect of the levitation SCM 3, and the vehicle body 1 is levitated and supported by the electromagnetic repulsion between this induced current and the levitation SCM 3.

FIG. 2 is a sectional view showing another configuration example of a superconducting magnetic levitation railway, and 7 is a propulsion guide SCM 2 in FIG. 1.
This is an SCM that also has the functions of the levitation SCM 3.

The system shown in FIG. 2 is generally called the U' type.

Compared to the U type shown in Fig. 1, the U' type shown in Figure 2 uses one type of SCM for floating propulsion and guidance, making it easier to configure the vehicle and reducing the number of SCMs per vehicle. Therefore, while it has many advantages such as improved reliability as a magnetically levitated vehicle and improved maintainability, SC
The required floating blade per M piece is large, and the technical difficulty is great.

Additionally, there is a drawback that it requires a lightweight SCMt with a magnetic force that makes it difficult to ensure reliability.

On the other hand, the floating blade for the U' type is represented by one set.

Here, K is a constant determined by the pitch of the levitation coil, the pitch of the SCM, etc., Lo is the self-inductance of the levitation coil,
Is is the magnetomotive force of the SCM, Mo is the mutual inductance between the SCM and the levitation coil, ago/a'Zj/ma is the vertical differential coefficient of Mo, ω is the dimensionless speed of the vehicle, and τ is the time constant of the levitation coil. .

As is clear from set 1, to obtain a large floating blade, SC
In addition to increasing the magnetomotive force of M, conceivable methods include (1) decreasing the self-inductance of the levitation coil, and (ii) increasing the mutual inductance between the S CM and the levitation coil and its differential coefficient.

but. Even if you reduce the self-inductance by reducing the dimensions of the levitation coil or by reducing the number of turns, if the levitation coil is arranged as shown in Figure 2, the mutual inductance and its differential coefficient will also decrease by +'3, and as a result, the levitation blade will become smaller. It will decrease.

Also, conversely, increase the dimensions of the levitation coil or increase the number of turns.

When increasing the mutual inductance with the SCM and its differential coefficient, there is a drawback that the increase in the amount of coil conductors and the increase in coil weight greatly affects the track cost.

Further, increasing the SCM= on the vehicle increases the vehicle weight and leads to an increase in the number of required flying blades, and it cannot be increased too much due to the vehicle configuration.

The present invention has been made in view of the above-mentioned drawbacks, and by symmetrically dividing and arranging each SCM row as a levitation coil on the left and right sides, the magnetomotive force of the SCM can be small, and the levitation coil can have a small magnetomotive force. This provides a configuration in which a large floating blade can be obtained without increasing the amount of conductor.

An embodiment of the present invention shown in FIG. 3 will now be described.

The levitation coils 8 are divided and arranged at symmetrical positions with respect to the SCM 7.

As an example, a case will be described in which the levitation coil 8 has the same length and width as the levitation coil 5 in FIG. 2, and has half the number of turns.

At this time, the amount of conductor per levitation coil 8 is half that of the levitation coil 5 shown in FIG. 2, and since there are two rows of levitation coils 8 per side of the track, the amount of conductor in each levitation coil is as follows:
The same applies to the case of FIG. 2 and the case of FIG.

Now, the floating blade in the case of the present invention is expressed by the following formula.

Here, MR is the mutual inductance between adjacent levitation coils 8, and the other symbols represent the same contents as in the case of 1 set.

Now, since the levitation coil 8 has the same length and width as the levitation coil 5, and has half the number of turns, the self-inductance L of the levitation coil in equations 1 and 2.

Mutual inductance between L, SCM and levitation coil M・9M
The relationship aZ゛ θZ between and its differential coefficient ago c'M is as follows.

In other words, it becomes.

Substitute equations 3 to 6 into equation 2 to obtain equation 7.

Further, if the interval between adjacent levitation coils 8 is greater than or equal to 0 to a certain extent, one general condition holds true.

In addition, in the high-speed range, since the following also holds true, equation 7 becomes equation 10 approximately.

This indicates that a floating blade twice as large as that of the U' type in the high speed range can be obtained.

In reality, there is an influence of MR and ω2τ2/4 + ω2r22
Although it is difficult to estimate the distance between the centers of adjacent conductors of adjacent levitation coils by 1.
The floating blade at a speed of 500 km/h at a distance of approximately 00 m was approximately 1.5 times that of the U' type.

As described above, according to the coil arrangement of the present invention, the same S
It is possible to obtain a larger levitation blade without increasing the amount of conductor in the levitation coil due to the CM magnetomotive force, and therefore, the SCM magnetomotive force can be reduced to obtain the same levitation blade.

If the magnetomotive force of the SCM can be reduced, the weight can be reduced by 80M and reliability can also be improved.

In addition, in the case of the U' type shown in Figures 2 and 3, even if the vehicle is not displaced left or right from the center of the track, a left-right electromagnetic force is acting on the SCM on one side, and the right and left side SCM
Since the sizes are the same and the directions are opposite, there is no force acting on the vehicle to displace it left or right, but this electromagnetic force always acts as a compressive or tensile force on the vehicle body structure that is fixed to the SCM= on both sides. is working.

In addition, when the vehicle is displaced in the left-right direction with respect to the track center, in the U' type, there is a difference in the size of the floating blade between the right SCM and the left SCM, and the vehicle body tends to roll. It has its drawbacks.

In the case of the present invention, if there is no left-right displacement of the vehicle with respect to the center of the track, only left-right electromagnetic force acts on the SCMs on either side. It has the advantage that the structure can be made lighter, and even if the vehicle is displaced from side to side with respect to the center of the track, the floating blades acting on the left and right SCMs are the same size and no rolling force is exerted.

In the embodiment of the present invention, the size and number of turns of the divided levitation coils are the same, but if the specifications are such that the levitation blades of each levitation coil are the same size, the size of the coil , the number of turns does not necessarily have to be the same.

Further, the effects of the present invention are the same even in the case where the track arrangement is such that the SCM sandwiches the estimation coil, or where there is only one row of SCM per vehicle.

[Brief explanation of the drawing]

Figure 1 is a sectional view perpendicular to the vehicle traveling direction showing one configuration example of on-board superconducting magnets and ground coils in a superconducting levitation railway, Figure 2 is a sectional view showing another configuration example, and Figure 3 is a cross-sectional view of the main structure. FIG. 1 is a sectional view showing one embodiment of the invention. In the figure, 1 is a vehicle body, 2 is an SCM for propulsion and guidance, 3 is an SCM for levitation, 4 is a track, 5 is a levitation coil, 6 is a guess Koinope 7 is an SCM for levitation and guidance 8 is a levitation coil arranged separately. In addition, in the figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A levitation ground coil laid on the ground, a superconducting magnet mounted on the vehicle and arranged approximately perpendicular to the levitation ground coil, and a propulsion guide laid on the ground opposite the superconducting magnet. a superconducting ground coil, which is levitated and supported by the electromagnetic force acting between the superconducting magnet and the ground coil for levitation, and is propelled and guided by the electromagnetic force acting between the superconducting magnet and the ground coil for propulsion and guidance. A levitation device for a superconducting magnetic levitation railway, characterized in that the levitation ground coils are divided and arranged laterally symmetrically with respect to the row of superconducting magnets and on the same ground plane.