JPH01202183A - Article levitation supporting device - Google Patents

Abstract

PURPOSE:To increase a levitation supporting force in a small size by levitating and supporting an article by a ferromagnetic element in a magnetic field by a superconducting coil. CONSTITUTION:An article levitation supporting device is composed of a superconducting coil 11 made of an yttrium-barium series oxide superconducting material, ferromagnetic units 12-13, and a support 14, and an article 15 is placed on the support 14. Thus, forces F12...F15 are generated at the units 12-13, the support 14 and the article 15. Then, the coil 11 is secured, set to a superconducting state, and the support 14 is so mounted as to receive an upward force at the support 14. When a current flows to the coil 11 in this state, the support 14 is levitated and supported. Thus, since it is in a noncontact structure, no wear and no fatigue are provided, and the levitating and supporting force can be varied by regulating the current.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention has a variable buoyancy support force, eliminates friction and fatigue of the buoyancy support part, generates a buoyancy support force semi-permanently, and improves the buoyancy support force. This invention relates to an object levitation support device that does not change over time.

[Conventional technology]

An example of a conventional object levitation support device is shown in FIGS. 6(a) to 6(d). In FIG. 6(a), 1 is a leaf spring, 2
is an object. Leaf spring 1 whose strength corresponds to the weight of object 2
One or more leaf springs are stacked, bent and joined at both ends, and the central part 3 of these leaf springs 1 is fixed to the ground or a stand 4,
The object 2 is supported in a floating manner at the central support portion 5 of the opposing leaf springs 7 and 1.

Furthermore, as shown in FIG. 6(b), the same effect as described above can be obtained even if both ends 6 of the stacked leaf springs 1 are directly fixed to the ground or the base 4. These are mainly used for floating support of vehicles.

FIG. 6(C) shows a floating support device using a coil spring. Reference numeral 7 denotes a coil spring, which is made of highly rigid metal into a coil shape, and by fixing one end of the spring, the object 2 is suspended and supported by a support section 5 attached to the other end.

FIG. 6(d) shows a floating support device using an air spring (air cylinder). 8 is a compressor, 9 is an air spring (air cylinder), and 10 is a sealing material for sealing the cylinder. Air compressed by the compressor is sent into the cylinder, and the object is suspended and supported by the elastic force of this compressed air. .

[Problem that the invention seeks to solve]

In the conventional examples shown in FIGS. 6(a) and 6(b), the device is large, there is a risk of metal fatigue or damage to the leaf spring 1, and the spring constant is limited due to the combination of the leaf springs 1. However, it has the disadvantage that it is not easy to change the buoyancy support force. Further, in the case shown in FIG. 6(C), like the leaf spring 1, there is a risk that the metal may weaken or the spring may be damaged due to fatigue. Since the spring constant is determined by the material, thickness, etc. of the spring material, it is difficult to change the buoyancy support force. Furthermore, although the spring constant shown in FIG. 6(d) can be changed by changing the pressure of compressed air, it has drawbacks such as the need for a compressor 8, which inevitably increases the size of the device. has.

The purpose of this invention is to eliminate the drawbacks of the above-mentioned conventional examples, to be small in size, to have a large buoyancy support force, to be able to easily change the buoyancy support force, and to prevent deterioration over time as there is no heat generation or wear. The object of the present invention is to provide a buoyancy support device that does not require constant application of energy to achieve this.

(Means for Solving the Problems) An object levitation support device according to the present invention includes a superconducting coil formed in a ring shape using a superconducting material, and a loop shape inside the superconducting coil. It is composed of a ferromagnetic material that levitates and supports an object that receives an electromagnetic force directed toward the center of the coil due to a magnetic field generated by a flowing current.

[Function] In this invention, a ferromagnetic material placed in a magnetic field created by a superconducting coil receives an electromagnetic force directed toward the center of the coil, and this magnetic force levitates and supports an object.

〔Example〕

First, the principle of this invention will be explained with reference to FIG. In FIG. 3, when the superconducting coil 11 is placed on the r-0 plane in the cylindrical coordinate system (x-r-θ plane), it can be assumed that the current flowing in the coil does not have an X-axis direction component. Therefore, the magnetic field H generated by the relationship rotH=i has a cross product relationship with the current vector, so it does not have a θ component and becomes a two-dimensional vector on the r-x plane.

FIG. 3 shows the magnetic field distribution generated when a current is passed through the superconducting coil 11 in the direction of the arrow in the figure (■ indicates from top to bottom with respect to the plane of the paper, and ■ indicates from bottom to top with respect to the plane of the paper).

This allows the coil center axis (X-axis) to be perpendicular to the r-θ plane.
The distribution of magnetic flux density B in the X-axis direction above is shown in Figure 4(a).
It becomes as shown in . Further, the slope dB/dx of the magnetic flux density B in the X-axis direction is symmetrical with respect to the origin in the 10x direction and the -x direction of the superconducting coil, as shown in FIG. 4(b). Also, since the magnetic force F acting on the ferromagnetic material on the X-axis at this time is proportional to the product of magnetic flux density B and dB/dX, the fourth
A magnetic force as shown in figure (C) is obtained. Further, even if the direction of the current is reversed, a force directed toward the center of the coil can be obtained as in FIG. 4(C).

In other words, if a ferromagnetic material is placed at point P (-p, 0°0) in Fig. 3, it will receive a force Fp directed toward the origin (coil center), and a force Fp will be applied to the superconducting coil surface opposite to point P. Q point (p
,0. The ferromagnetic material placed at point O) receives a Kerr Fp directed toward the center of the coil in the same way as the ferromagnetic material placed at point P.

In this way, the ferromagnetic material near the center of the coil receives a force directed toward the center of the coil due to the magnetic field created by the coil in which current flows in a certain direction. Therefore, as shown in Fig. 5(a), if the ferromagnetic bodies 12 and 13 which are subjected to forces in both directions are combined, the two forces cancel each other out at a certain position and become stable, but from this state, as shown in Fig. 5(b). As shown in FIG. .

(d)).

A similar structure can be realized using a normal conduction coil, but it is not practical as a general-purpose floating object support device due to the heat generation and power consumption as it requires constant current flow. On the other hand, object levitation support devices using superconducting coils can confine the magnetic flux in the center of the coil due to the Meissner effect of superconducting materials, so the force directed toward the center can be sufficiently large and the resistance Since the current continues to flow at zero, there is no problem of heat generation, and power consumption is zero. In addition, when changing the elastic force of a spring, it is only necessary to control the current flowing through the coil, which not only allows for a smaller size compared to conventional springs that utilize the elastic force of metal.
It is possible to eliminate defects such as fatigue and wear due to aging.

FIG. 1(a) shows a first embodiment of the present invention based on the above principle, and FIG. 1(b) is an explanatory diagram of the forces acting on each part. 11 is a superconducting coil made of yttrium barium-based oxide superconducting material, 12.13 is a ferromagnetic material,
Reference numeral 14 indicates a support portion, and reference numeral 15 indicates an object to be placed on the support portion 14.

F 121 F 131 F 141 F +s are the ferromagnetic materials 12, 13, respectively. The forces acting on the support 14 and the object 15 are shown. The superconducting coil 11 is fixed and brought into a superconducting state, and the supporting part 14 is installed so that the supporting part 14 receives a downward force and the ferromagnetic part 12 receives an upward force. Superconducting coil 1
When a current is applied to the support portion 14, the support portion 14 is supported in a floating manner. The force relationship of each part at this time is F13=F 120F 14+
It becomes F15. By placing the object 15 on this support portion 14, it is possible to support the object 15 in a floating manner without contact.

Because of this non-contact structure, there is no wear or fatigue, and the levitation support force can be changed by adjusting the current flowing through the superconducting coil 11 or by changing the arrangement of the ferromagnetic materials 12 and 13. can. Furthermore, once a ring current is applied, there is no need to supply energy, so it can be used semi-permanently.

FIG. 2 shows a second embodiment of the invention. I
IA, 11B are superconducting coils, 14 is a support part (rotating shaft)
, 16 is a conductor disk attached to the center of the support part 14, 17 is a linear motor, and the conductor disk 16, which is rotated by receiving torque from the linear motor 17, is supported in levitation by two superconducting coils 11A and 11B. As a result, the bearings are non-contact, and compared to conventional bearing mechanisms, there are significant improvements in terms of wear, noise, and the use of lubricating oil (grease).

In the above embodiment, one superconducting coil 11, II
Two ferromagnetic bodies 12 and 13 were used for A, IIB, etc., but even if only the ferromagnetic body 13 that generates an upward force balances the downward force including the object 15 etc. good.

[Effects of the Invention] As explained above, the present invention includes a superconducting coil formed in a ring shape using a superconducting material to form a loop;
It is composed of a ferromagnetic material that levitates and supports an object by receiving electromagnetic force toward the center of the coil due to the magnetic field generated by the current flowing in a loop inside the superconducting coil.
Compared to conventional levitation support devices that utilize the elastic force of metal such as leaf springs or coil springs, there is no fear of damage due to wear or fatigue, the levitation support force can be easily varied, and energy is constantly supplied. It has the advantage that it is not necessary. In addition, the device can be made more compact than an air spring with variable levitation support force, and does not generate heat, so it can be applied to any type of levitation support.

[Brief explanation of the drawing]

FIG. 1(a) is a schematic configuration diagram showing one embodiment of the present invention, FIG. 1(a') is an explanatory diagram of the force relationship of each part in the embodiment of FIG. 1(b), and FIG. Figure 3, a schematic diagram of the configuration of another embodiment of the invention, shows the magnetic field generated when a current is passed in a certain direction through a superconducting coil, and the direction of the force exerted on a ferromagnetic material placed in this magnetic field. 4(a) is the X-direction component of the magnetic flux density B on the X-axis in FIG. 3, FIG. 4(b) is the slope in the X-direction, and FIG. 4(C) is the force in the X-direction. Fig. 5(a) is a drawing showing the balanced state of force exerted on the ferromagnetic material placed on both sides of the superconducting coil, and Fig. 5(b) is a diagram showing the force that occurs when displacement X is applied. Diagrams showing the direction of force, Figures 5(C) and (d), Figure 5(a),
A graph representing the state of (b), Figures 6(a) to (d)
) are diagrams showing various examples of conventional floating support devices. In the figure, 11. IIA, 11B is a superconducting coil, 12.1
3 is a ferromagnetic material that receives force, 14 is a support portion, 15 is an object to be supported in levitation, 16 is a conductor disk, and 17 is a linear motor. Figure 1 (a) Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 (a) (b) (c) (d) Procedural amendment (engraved December 23, 1988)

Claims (1)

[Claims] A superconducting coil formed in a ring shape using a superconducting material and a magnetic field generated by a current flowing in a loop inside this superconducting coil receives an electromagnetic force directed toward the center of the coil to levitate and support an object. An object levitation support device comprising a ferromagnetic material.