JPH01206804A - Magnetically levitated vehicle - Google Patents

Abstract

PURPOSE:To enable traveling of a magnetic levitating vehicle driven by the use of liquid nitrogen with the longitudinal speed thereof being controlled, by arranging a plurality of electromagnets as a rail and exciting predetermined number of them arranged in the vicinity of the magnetically levitated vehicle such that a trough of magnetic field is produced. CONSTITUTION:Seventy-two normal superconducting electromagnets 3 having inner diameter of 10mm, outer diameter of 30mm and height of 100mm and comprising a core 4 wound with copper wire of 1mm diameter are arranged concentrically in two rows together with supporting members 5 to prepare a rail 2 having outer diameter of 500mm. A pellet 1 having thickness of 2mm, outer diameter of 50mm and height of 30mm is made of Y, Ba, Cu, oxide, then the pellet 1 is cooled in liquid nitrogen and poured with liquid nitrogen 6 and placed on the rail 2. When the normal superconducting electromagnet 3 is excited such that a trough of magnetic field is produced, the oxide superconductor runs along the trough of the magnetic field.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic levitation vehicle, and particularly to a magnetic levitation vehicle suitable for exhibitions, demonstrations, and toys.

[Conventional technology]

Conventional magnetic levitation vehicles, known as linear motor cars, generate a magnetic field by exciting electromagnets on the levitation side mounted on the magnetic levitation vehicle and levitation and propulsion electromagnets installed on the ground. It was levitated by the repulsive force of the magnetic field and propelled by the repulsive and attractive forces. As the electromagnet on the floating side, a superconducting electromagnet is used to reduce weight and generate a high magnetic field. This superconducting electromagnet used Nb-Ti superconducting material, required expensive liquid helium as a coolant to excite it, and had a complicated heat-insulating container structure.

Recently discovered oxide superconducting materials are attracting attention because they exhibit superconductivity even in liquid nitrogen. However, oxide superconducting materials currently have a low critical current density as a bulk material, and are also brittle, making it difficult to form them into wires and coils. Therefore, it is impossible to immediately apply this method to superconducting electromagnets used in linear motor cars.

The method described above takes advantage of the zero electrical resistivity property of superconducting materials. In addition to this property, superconducting materials also have a completely diamagnetic property called the Meissner effect. When a superconducting substance is placed on top of a permanent magnet,
Perfect diamagnetism causes the superconducting material to levitate above the permanent magnet. Alternatively, similar results can be obtained by reversing the arrangement of the permanent magnet and superconducting material and placing the permanent magnet on top of the superconducting material. The above-mentioned method is generally known as an easy method for confirming perfect diamagnetism. A magnetically levitated vehicle using this method and equipped with permanent magnets on an oxide superconductor was published in the Nikkan Kogyo Shimbun published on November 25, 1988. In this example of a magnetically levitated vehicle, the oxide superconductor as the rail is laid so as to have an inclination, and the propulsion force is gravity.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not take into account the method of controlling the propulsion force of the magnetically levitated vehicle operated by liquid nitrogen, and the vehicle only travels from the top to the bottom of the inclined rail, and it is not possible to control the traveling speed. Ta.

An object of the present invention is to allow a magnetically levitated vehicle operated by liquid nitrogen to travel in the longitudinal direction on a rail while controlling its speed.

[Means for solving the problem] The above purpose is to use an oxide superconductor on the levitation side, arrange a plurality of electromagnets as rails, and place a predetermined number of electromagnets near the magnetically levitated vehicle to create a valley in the magnetic field. This is achieved by exciting the magnetic field and moving the valley of the magnetic field continuously.

[Effect]

When a predetermined number of electromagnets used as rails are excited so that a valley in the magnetic field is generated, the oxide superconductor that is maintained in a superconducting state, which is a magnetically levitated vehicle, tries to take a stable arrangement, so it settles in the valley in the magnetic field. Moving. As described above, by continuously moving the valleys of the magnetic field, the oxide superconductor, that is, the magnetically levitated vehicle travels to follow the valleys of the magnetic field. Of course, the speed of the magnetic levitation vehicle can be controlled by varying the speed at which the magnetic field travels through the valleys.

〔Example〕

Examples of the present invention will be described below.

First example: A copper wire with a diameter of 1ffi is wound around the iron core 4, the inner diameter is ioam, the outer diameter is 30 nm, and the height is 100 nn (7).
The rail 2 shown in FIG. 1 was made by arranging 72 normally conducting electromagnets 3 and the supporting material 5 shown in FIG. 2 concentrically in two rows so that the outermost diameter was 500++n. Y.

Made of Ba and Cu oxides, with a thickness of 2 nn as shown in Figures 3 and 4.
A container-shaped pellet 1 with an outer diameter of 50 mm and a height of 30 mm+ was prepared, and after cooling in liquid nitrogen, liquid nitrogen 6 was poured into the pellet 1 and placed on the rail 2 described above. As shown in FIG. 5, eight normal conducting electromagnets 3 were excited so that the maximum magnetic field of each normal conducting electromagnet was 4000 Gauss and the valley part of the magnetic field was 3000 Gauss. According to this embodiment, the normal conductive electromagnets 3 are arranged in two rows, and the pellet 1 can be run stably against lateral vibration on the rail, and the pellet 1 is made into a container shape. Since liquid nitrogen can be stored inside, it is possible to run for 5 minutes with liquid nitrogen 6 injected before running.

Second embodiment: As shown in Figure 6, diameter 10m height 1
0 nm diameter samarium cobalt permanent magnet 7
．． An outer diameter of 15 m made by winding 1 m of copper wire around iron core 4.
A composite magnet 8 was produced by fixing a normal conductive magnet 3 having a diameter of 10 I and a height of 20 nn+.

The composite magnets 8 were arranged concentrically in eight rows as shown in FIG. 7 so as to have an outermost diameter of 500 mm to form a rail 2.

Sixty-four normally conducting electromagnets 3 were excited in the same manner as in the first example. According to this embodiment, since the magnetic field distribution can be controlled with high precision, the pellet 1 can be run more smoothly.

〔Effect of the invention〕

According to the present invention, a magnetically levitated vehicle operated by liquid nitrogen can be caused to travel in the longitudinal direction of the rail with its speed controlled.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a plan view of a pellet and rail according to the first embodiment of the present invention, Fig. 2 is a sectional view of a portion of the rail, Fig. 3 is a perspective view of the pellet, and Fig. The figure is a cross-sectional view of a pellet filled with liquid nitrogen, Figure 5 is a time chart of coil current showing the excitation pattern of a normal conducting electromagnet, and Figure 6 is a longitudinal cross-sectional view of a composite magnet according to a second embodiment of the present invention. FIG. 7 is a plan view of a portion of the rail. 1...Pellet, 2...Rail, 3...Normal conducting electromagnet, 4...Iron core, 5...Support material, 6...Liquid nitrogen, 7...Permanent Figure 1

Claims (1)

[Claims] 1. In a magnetic levitation vehicle that maintains an oxide superconductor in a superconducting state and levitates it with complete diamagnetic properties, multiple electromagnets are arranged as rails, and the magnetic field generated by exciting the electromagnets is used to levitate. and a magnetic levitation vehicle characterized by being driven.