JPS62110405A - Ground coil for magnetic levitation railway - Google Patents

Abstract

PURPOSE:To decrease the size of conductor necessary for the ground coil by making both sides of a ground coil semicircular which is perpendicular in the direction of the movement of carriage and by taking the total shape of a race truck. CONSTITUTION:The ground coil takes a shape of race truck. The arcs of the race truck-shaped levitation coil 1 and race truck-shaped propulsion/guide coil 2 are arranged in the direction of the movement of carriage. Thus the force more powerful than with the rectangular coil is generated, and the size of conductor can be decreased which is smaller than with the rectangular ground coil.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is one of the features of an induced repulsion type magnetic levitation railway! This relates to the shape of the ground coil that generates magnetic force.

[Conventional technology and problems]

Conventionally, the ground coils for levitation, propulsion, and guidance in induction-repulsion magnetic levitation trains have been rectangular. When the ground coil has a rectangular shape, it is relatively easy to analyze the force, and when the number of coil turns is large, it is relatively easy to manufacture.However, it is difficult to generate the necessary force. The disadvantage is that a large amount of conductor is used and the material cost is high.

[Purpose of the invention]

The present invention aims to provide a ground coil for an inductive repulsion type magnetic levitation railway with a shape that efficiently generates the necessary force, and to minimize the amount of conductor required for the ground coil.

[Structure of the invention]

The present invention provides a rectangular ground coil in which electromagnetic force is induced by a superconducting coil on the vehicle side of an inductive repulsion type magnetic levitation railway, by making both sides perpendicular to the direction of vehicle travel semicircular without changing the length of the ground coil, thereby improving the overall shape. The superconducting coil has a racetrack shape, and is characterized by having a large effective area at the center of the ground coil so that the magnetic flux linkage generated by the superconducting coil becomes large.

〔Example〕

The present invention will be explained below based on the illustrated embodiments. FIG. 1 shows a comparison between the racetrack shape of the ground coil of the present invention and the conventional rectangular shape. FIG. 2 shows the outer shape of the racetrack type ground coil of the present invention. FIG. 3 shows the racetrack type ground coil of the present invention installed on the track, with the racetrack type levitation coil 1 and the racetrack type propulsion/guidance coil 20 having arcuate portions facing the direction of vehicle travel. Ru. In Figure 1, if the circumferences of the racetrack coil and the rectangular coil are the same (that is, the amount of material is the same), the racetrack coil clearly has a larger encircling area and is also longer in the vehicle traveling direction. become longer.

FIG. 4 shows the arrangement of the vehicle-side superconducting coil 4 and the racetrack-type levitation coil 1 within a cross section perpendicular to the traveling direction of the vehicle. The figure shows the distribution of the vertical magnetic flux density (Bz) generated by the superconducting coil 4 on the vehicle side.
) becomes larger. As mentioned above, when the ground coil shape is racetrack-shaped, the area is larger than that of a rectangular shape, and the vertical magnetic flux density can be increased, and the number of floating blades roughly proportional to I can be increased. On the other hand,
Since the (inductance)/(resistance) 2 time constant is larger when the coil shape is more circular than when it is rectangular, the lift-drag ratio, which indicates good flying characteristics, can be increased.

FIG. 5 shows the arrangement of the vehicle side superconducting coil 4 and the racetrack type propulsion/guidance coil 2 and the distribution of the lateral magnetic flux density (By) in a cross section perpendicular to the direction of travel of the vehicle. As expected, the racetrack type propulsion/guidance coil v increases, the induced voltage as a linear motor increases, and the lateral guidance becomes stronger (also becomes stronger.Furthermore, the longer the length of the ground coil in the vehicle traveling direction is, the more the induced voltage increases. The racetrack coil can be said to be superior in this respect as the harmonic components are reduced.

〔Effect of the invention〕

The racetrack ground coil according to the invention generates more force than a conventional rectangular coil with the same amount of conductor, and therefore requires a smaller amount of conductor than a conventional rectangular ground coil to generate the required force. You can get away with it. Further, as an armature coil of a linear motor, the third harmonic induced voltage can be reduced, and the adverse effect on the power source can be reduced.

[Brief explanation of drawings]

FIG. 1 (al is a schematic diagram of the racetrack type ground coil of the present invention, FIG. 1(b) is a schematic diagram of the conventional rectangular ground coil, and FIG. 2 is a schematic diagram of the racetrack type ground coil of the present invention. Figure 3 is a diagram showing the racetrack type ground coil of the present invention installed on a track, and Figure 4 is a cross section perpendicular to the direction of vehicle travel, showing that the vehicle side superconducting coil is on the surface of the levitation ring coil. Kinmei diagram of the distribution of vertical magnetic flux density created in
FIG. 5 is a distribution diagram of the transverse magnetic flux density produced by the vehicle-side superconducting coil on the surface of the ground coil for propulsion and guidance within a cross section perpendicular to the vehicle traveling direction. DESCRIPTION OF SYMBOLS 1... Racetrack type levitation coil, 2... Racetrack type propulsion guide coil, 3... Guideway, 4
...Vehicle side superconducting coil. Designated Agent 11 I°1 Yukuku J Road i', 2, Nonu Office Legal Affairs Division Chief Tatsu Honma 91 sides 51 figures

Claims (1)

[Claims] In a rectangular ground coil in which electromagnetic force is induced by a superconducting coil on the vehicle side of an inductive repulsion type magnetic levitation railway, both sides perpendicular to the vehicle traveling direction are semicircular without changing the circumference of the ground coil, and the overall shape is shaped like a race track. 1. A ground coil for magnetic levitation railway, characterized in that the effective area of the central part of the ground coil is increased so that the magnetic flux linkage generated by the superconducting coil is increased.