JPH05180227A - Superconductive bearing device - Google Patents

Abstract

PURPOSE:To improve load capacity and rigidity, prevent shaft vibration of a rotor and stably support the rotor in a non-contact state. CONSTITUTION:A superconductive bearing device is provided with two ring-like permanent magnets 6a and 6b in concentric relation with a perpendicular shaft- like rotor 1 and opposing to each other. A superconductive body 10 is provided so as to be positioned between both the ring-like permanent magnets 6a and 6b. The faces of both the permanent magnets 6a and 6b, which oppose to each other, are magnetized in same polarity. The permanent magnets 6a and 6b are arranged near enough to repulse each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a fluid machine or a machine tool which requires high speed rotation, an electric power storage device for converting surplus electric power into kinetic energy of a flywheel and storing it.
Also, the present invention relates to a superconducting bearing device applied to a gyroscope or the like.

[0002]

2. Description of the Related Art In recent years, a superconducting bearing device capable of supporting a rotating body in a non-contact state has been developed as a bearing device capable of high-speed rotation and high rigidity of the rotating body.

An example of this type of superconducting bearing device is one annular permanent magnet that is concentrically provided on a rotating body and that has both ends in the direction of the axis of rotation bearing magnets of opposite polarities.
It is conceivable that the permanent magnet is provided with an annular superconductor arranged so as to oppose the end surface of the permanent magnet in the direction of the rotation axis of the rotating body.

However, the superconducting bearing device as described above has a problem that the load capacity and the rigidity are insufficient.
In addition, there is a problem in that the rigidity of the rotating body causes axial deviation of the rotating body, which makes it impossible to stably support the rotating body in a non-contact state.

An object of the present invention is to provide a superconducting bearing device which solves the above problems.

[0006]

A superconducting bearing device according to the present invention is a superconducting bearing device which supports a rotating body in a non-contact state with a fixed portion, and is concentric with the rotating body and faces each other. Two annular permanent magnets provided in such a manner, and a superconductor provided concentrically with the rotating body and located between both annular permanent magnets. The magnets have the same polarity as each other, and the distance between the permanent magnets is such that they repel each other.

[0007]

Operation: Two annular permanent magnets which are concentric with the rotating body and are provided so as to face each other, and a superconducting device which is provided concentrically with the rotating body and is located between the two annular permanent magnets. If the body is provided, both permanent magnets and the superconductor are held in a state of facing each other with a predetermined gap, and the rotating body is supported in a non-contact state.

If the opposing surfaces of the two permanent magnets are magnetized with the same polarity, and the distance between the two permanent magnets is such that they repel each other, the two permanent magnets will become repulsive. The magnetic flux formed by is compressed. Therefore, a large amount of magnetic flux penetrates the superconductor, and the superconductor traps a large amount of magnetic flux.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows a main part of a superconducting bearing device.

The superconducting bearing device is a vertical shaft-shaped rotating body.
It has (1). The rotating body (1) is provided with two upper and lower horizontal disk-shaped permanent magnet parts (2a) (2b) concentrically with the rotating body (1) at intervals in the direction of the rotation axis. Permanent magnet part
Both permanent magnet parts (2a) and (2b) so that they face the facing surfaces of (2a) and (2b) with a gap in the direction of the rotation axis of the rotating body (1).
The ring-shaped superconductor portions (3a) (3b) (3c) are respectively arranged between the permanent magnet portions (2a) (2b) and between the permanent magnet portions (2a) (2b).

The permanent magnet portions (2a), (2b) are fixedly provided on the rotating body (1), and are opposed to each other at intervals in the direction of the axis of rotation, and are composed of, for example, two upper and lower horizontal discs made of copper ( It has 4a) and 4b). The upper surface of the upper disc (4a) and the lower disc
On the lower surface of (4b), annular grooves (5a) (5b) concentric with the rotating body (1) are formed respectively, and these are formed in these grooves (5a) (5b). Ring permanent magnets (6a) (6b)
Is fitted and fixed. The upper and lower ends of each of the permanent magnets (6a) (6b) are magnetized with opposite polarities, and the opposing surfaces of both permanent magnets (6a) (6b) are magnetized with the same polarity. For example, the upper end of the upper permanent magnet (6a) has an N-pole magnetism and the lower end has an S-pole magnetism. The upper end of the lower permanent magnet (6b) has an S-pole magnetism and the lower end has an N-pole magnetism. Bears. The distance between the permanent magnets (6a) and (6b) is such that they repel each other. The magnetic flux distribution around the rotation axis does not change due to rotation.

The superconductor portions (3a) (3b) (3c) are fixedly provided in the housing (7), respectively, and have perforated horizontal discs (8a) (8b) (8c) made of copper, for example. Perforated disk (8a) (8b) (8
c) A plurality of superconductors embedded in the annular part concentric with the rotating body (1) around the holes (9a) (9b) (9c) facing both permanent magnets (6a) (6b). It consists of (10). All superconductors
The volumes of (10) are equal.

The superconductor (10) is made of, for example, a yttrium-based high-temperature superconductor, YBa ₂ Cu ₃ O _{x, in} which normal conductive particles (Y ₂ Ba ₁ Cu ₁ ) are uniformly mixed in a substrate. , Has the property of restraining the penetration of magnetic flux emitted from the permanent magnets (7a) and (7b). The superconductor (10) is arranged at a separated position where the magnetic flux of the permanent magnets (7a) (7b) penetrates by a predetermined amount, and at a position where the distribution of the magnetic flux penetrating does not change due to the rotation of the rotating body.

A cooling case (not shown) is provided on the horizontal disks (8a) (8b) (8c) of the superconducting bearing device, and the cooling device (11) is connected to the cooling case.

When operating the superconducting bearing device, the superconductor (10) is cooled by a cooling medium (11) with a suitable refrigerant circulated in the cooling cases of the disks (8a) (8b) (8c),
It is kept superconducting. For this reason, most of the magnetic flux generated from the permanent magnets (6a) (6b) of the rotating body (1) is the superconductor (10).
Will be invaded and restrained (pinning phenomenon). Here, since the superconductor (10) has the normal conductor particles uniformly mixed therein, the distribution of the magnetic flux penetrating into the superconductor (10) is constant, and therefore, as if the superconductor (10) Permanent magnet (6a) of the rotating body (1) on the erected virtual pin
The (6b) appears to be penetrated, and the rotating body (1) is constrained to the superconductor (10) together with the permanent magnet parts (2a) and (2b). Therefore, the rotating body (1) is supported in the axial direction and the radial direction while floating very stably.

Permanent magnets (2a), (2b) permanent magnets (6a) (6b)
Repel each other, so that the magnetic flux formed by both permanent magnets (6a) and (6b) is compressed in the direction of the rotation axis. As a result, more magnetic flux penetrates the superconductor (10),
Since (10) traps a large amount of magnetic flux, load capacity and rigidity are improved.

In the above-described embodiment, the rotating body is provided with the permanent magnet and the housing, which is the fixed portion, is provided with the superconductor. On the contrary, the rotating body is provided with the superconductor and the fixed portion is provided. The housing may be provided with a permanent magnet. Further, in the above embodiment, the annular superconductor portions are arranged not only between the permanent magnet portions but also on the outer sides of the permanent magnet portions in the rotational axis direction, respectively. The magnet part is not always necessary.

[0019]

According to the superconducting bearing device of the present invention, as described above, the rotating body can be stably rotatably supported in a non-contact state. Further, since the magnetic flux penetrating the superconductor increases and the superconductor traps a large amount of magnetic flux, load capacity and rigidity are improved.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a main part of a superconducting bearing device showing an embodiment of the present invention.

[Explanation of symbols]

 1 Rotating body 6a, 6b Permanent magnet 10 Superconductor

Claims (1)

[Claims] 1. A superconducting bearing device for supporting a rotating body in a non-contact state with a fixed portion, comprising: two annular permanent magnets concentric with the rotating body and provided so as to face each other; It becomes concentric with the rotating body,
And a superconductor provided so as to be located between both annular permanent magnets, the facing surfaces of both permanent magnets are magnetized with the same polarity, and the distance between the two permanent magnets is , A superconducting bearing device having a distance such that they repel each other.