JPH04331815A - Superconductive bearing device - Google Patents

Abstract

PURPOSE:To stably support a rotational body by a superconductive body with a simple structure. CONSTITUTION:A superconductive bearing device is provided with a disc-like permanent magnet 3 arranged eccentrically to a rotational body 1, and a superconductive body 2 arranged opposedly to an end face of the permanent magnet 3 with a distance in the direction of a rotational axis of the rotational body 1. The permanent magnet 3 is provided on the rotational body 1 so as not to change a flux distribution around the rotational axis of the rotational body during rotation. The superconductive body 2 which allows entering of the flux of the permanent magnet 3 is arranged on a distanced position where the flux of the permanent magnet 3 enters by a specified rate and the entered flux distribution is not changed by the rotation of the rotational body 1.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a superconducting bearing device using a superconductor that allows magnetic flux penetration.

0002

[Prior Art] As a superconducting bearing, for example,
The one shown in Japanese Patent No. 3-243523 is known.

This superconducting bearing uses a type 1 superconductor, that is, a superconductor that completely blocks magnetic flux penetration, and utilizes the perfect diamagnetic phenomenon of the superconductor. In this superconducting bearing, both ends of a rotating shaft made of a superconductor are placed in recesses of a pair of supporting members made of a magnetic material with one magnetic pole, respectively, so that the rotating shaft is supported in the axial direction in a non-contact manner. It is configured.

0004

[Problems to be Solved by the Invention] By the way, as mentioned above, this conventional superconducting bearing is unstable in the direction perpendicular to the direction of repulsion because it performs non-contact support using the property of complete diamagnetic properties. Therefore, it is necessary to process the support member that supports both ends of the rotation shaft into a shape that wraps around both ends of the rotation shaft, and also to form the parts that face each other in the axial and radial directions between both ends of the rotation shaft and the support member. , it was necessary to magnetize it, making manufacturing and design troublesome.

[0005] The purpose of the present invention is to solve the above problems,
An object of the present invention is to provide a superconducting bearing device that can support rotation with a simple structure.

[0006]

[Means for Solving the Problems] A superconducting bearing device according to a first aspect of the invention includes a disk-shaped permanent magnet section provided concentrically on a rotating body, and a rotating body that rotates with respect to an end surface of the permanent magnet section. and superconductors arranged to face each other at intervals in the axial direction, and the permanent magnet section is configured to prevent the magnetic flux distribution around the rotational axis of the rotating body from changing due to the rotation. The superconductor is installed in the body, and the superconductor allows the magnetic flux of the permanent magnet section to enter, and the superconductor is located at a distant position where the magnetic flux of the permanent magnet section enters a predetermined amount, and the superconductor allows the magnetic flux of the permanent magnet section to enter by the rotation of the rotating body. It is placed at a position where the distribution of magnetic flux does not change.

[0007] The permanent magnet section includes a plurality of annular permanent magnets arranged at intervals in the radial direction of the rotating body and a non-magnetic material between them, and the permanent magnet section is arranged in the direction of the rotation axis of each permanent magnet. Both ends may be magnetized with opposite polarities, and the same end portions of all permanent magnets in the direction of the rotation axis may be magnetized with the same polarity.

[0008] The permanent magnet section is composed of a plurality of annular permanent magnets arranged at intervals in the radial direction and a non-magnetic material between them, and both sides of each permanent magnet in the radial direction are opposite to each other. It may have a magnetic polarity, and opposing sides of adjacent permanent magnets may have a magnetic polarity of the same polarity.

The permanent magnet section includes a plurality of annular permanent magnets arranged at intervals in the direction of the rotation axis, and a non-magnetic material between them, and both ends of each permanent magnet in the direction of the rotation axis may be magnetized with opposite polarities, and opposing ends of adjacent permanent magnets may be magnetized with the same polarity.

[0010] A superconducting bearing device according to a second aspect of the present invention includes a disk-shaped permanent magnet section provided concentrically on a rotating body, and a spaced apart from the outer peripheral surface of the permanent magnet section in the radial direction of the rotating body. and superconductors arranged to face each other, and the permanent magnet section is provided on the rotating body so that the magnetic flux distribution around the rotation axis of the rotating body does not change due to rotation. Yes, the superconductor allows the magnetic flux of the permanent magnet section to enter, and the position is a separate position where the magnetic flux of the permanent magnet section penetrates by a predetermined amount, and the distribution of the penetrating magnetic flux does not change due to the rotation of the rotating body. It is located in

[0011] The permanent magnet section is composed of a plurality of annular permanent magnets arranged at intervals in the radial direction and a non-magnetic material between them, and both sides of each permanent magnet in the radial direction are opposite to each other. It may have a magnetic polarity, and opposing sides of adjacent permanent magnets may have a magnetic polarity of the same polarity.

The permanent magnet section includes a plurality of annular permanent magnets arranged at intervals in the direction of the rotation axis, and a non-magnetic material between them, and both ends of each permanent magnet in the direction of the rotation axis may be magnetized with opposite polarities, and opposing ends of adjacent permanent magnets may be magnetized with the same polarity.

[0013]

[Operation] In both the first and second inventions, the permanent magnet part and the superconductor face each other at a predetermined distance due to the restraining action of the magnetic flux of the permanent magnet part that has entered the superconductor. Retained. In this state, it is possible to rotate the rotating body including the permanent magnet part around its axis. At this time, the magnetic flux that has entered the superconductor does not become a resistance that impedes rotation as long as the magnetic flux distribution is uniform and unchanged with respect to the rotation axis. Therefore, by simply positioning the permanent magnet portion of the rotating body relative to the superconductor at a predetermined position, it is possible to support the superconductor in a non-contact manner in the axial and radial directions.

In the case of the first invention, the rotating body can be stably rotated using a simple structure in which a disk-shaped permanent magnet section is provided on the rotating body and the superconductor is arranged so as to face the end face of the disk-shaped permanent magnet section. I can support it.

[0015] In the case of the second invention as well, the rotating body can be stably maintained using a simple structure in which a disk-shaped permanent magnet portion is provided on the rotating body and the superconductor is arranged so as to face the outer peripheral surface of the disk-shaped permanent magnet portion. It can be rotated and supported.

[0016] The permanent magnet section is composed of a plurality of annular permanent magnets arranged at intervals in the radial direction of the rotating body and a non-magnetic material between them, and both ends of each permanent magnet in the direction of the rotation axis are magnetized with opposite polarities, and the same ends of all permanent magnets in the rotational axis direction are magnetized with the same polarity, then at each end of the permanent magnet part, multiple permanent magnets have the same polarity. The magnetic comrades repel each other, and magnetic flux extends in the direction of the rotation axis. Therefore, in the case of the first invention, a large amount of magnetic flux enters the superconductor arranged to face the end surface of the permanent magnet part, and the superconductor traps a large amount of magnetic flux, resulting in an increase in load capacity and rigidity. improves.

[0017] The permanent magnet section is composed of a plurality of annular permanent magnets arranged at intervals in the radial direction and a non-magnetic material between them, and both sides of each permanent magnet in the radial direction have opposite polarities. If the opposing sides of adjacent permanent magnets are magnetized with the same polarity, magnetic comrades with the same polarity will repel each other on the opposing sides of the adjacent permanent magnets, and the Magnetic flux expands in both directions. Therefore, in the case of the first invention, a large amount of magnetic flux enters the superconductor arranged to face the end surface of the permanent magnet part,
As above, load capacity and rigidity are improved. Also, the second
Also in the case of the invention, more magnetic flux penetrates into the superconductor disposed to face the outer circumferential surface of the permanent magnet portion, and the load capacity and rigidity are improved as described above.

The permanent magnet section is composed of a plurality of annular permanent magnets arranged at intervals in the direction of the rotation axis, and a non-magnetic material between them, and both ends of each permanent magnet in the direction of the rotation axis are If the opposing ends of adjacent permanent magnets are magnetized with opposite polarities and the opposite ends of the adjacent permanent magnets are magnetized with the same polarity, then the magnets with the same polarity repel each other at the opposing ends of the adjacent permanent magnets, and The magnetic flux expands in both the radial and radial directions. Therefore, in the case of the first invention, more magnetic flux penetrates into the superconductor disposed to face the end face of the permanent magnet portion, and the load capacity and rigidity are improved as described above. Also, in the case of the second invention, more magnetic flux penetrates into the superconductor disposed to face the outer circumferential surface of the permanent magnet portion, and the load capacity and rigidity are improved as described above.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Several embodiments of the present invention will be described below with reference to the drawings. Note that in these embodiments, corresponding parts are given the same reference numerals.

FIG. 1 schematically shows the main parts of a superconducting bearing device according to a first embodiment.

The superconducting bearing device has a vertical shaft-like rotating body (
1) and a superconductor (2). Rotating body (1)
A horizontal disk-shaped permanent magnet part (3) is provided concentrically, and the rotating body (1) is attached to the lower end surface of the permanent magnet part (3).
Superconductors (2) are arranged so as to face each other at intervals in the direction of the rotation axis. The superconductor (2) is in the shape of a disk with a hole, and the rotating body (1) is passed through the hole with a gap left.

The permanent magnet portion (3) includes a plurality of annular permanent magnets (4a) (4b) arranged at intervals in the radial direction.
) (4c) and the non-magnetic material (5) between them, and is fixed to the rotating body (1). The upper and lower ends of each permanent magnet (4a) (4b) (4c) are magnetized with opposite polarities, and all permanent magnets (4a) (4b)
) (4c) have the same polarity of magnetism. For example, the upper ends of all the permanent magnets (4a, 4b, and 4c) are magnetically N-pole, and the lower ends are magnetically S-pole. and,
The magnetic flux distribution around the rotation axis does not change due to rotation.

The superconductor (2) is made of a substrate made of an yttrium-based high-temperature superconductor, such as YBa2Cu3Ox, in which normal conducting particles (Y2Ba1Cu1) are uniformly mixed, and the magnetic flux emitted from the permanent magnet part (3) It has the property of restraining intrusion. The superconductor (2) is disposed at a separate position where a predetermined amount of magnetic flux from the permanent magnet portion (3) penetrates, and at a position where the distribution of the penetrating magnetic flux does not change due to the rotation of the rotating body.

A temperature control unit (21) is installed in the housing (not shown) of the superconducting bearing device using a refrigerator (20) or the like.
A cooling case (22) is fixed to be cooled through the cooling case (22), and a superconductor (2) is fixed to this cooling case (22).

When the superconducting bearing device is operated, the superconductor (2) is cooled and maintained in a superconducting state by a suitable coolant circulated in the cooling case (22). For this reason, much of the magnetic flux emitted from the permanent magnet portion (3) of the rotating body (1) enters the inside of the superconductor (2) and is trapped (trap phenomenon). Here, since the superconductor (2) has normal conductor particles uniformly mixed inside it, the distribution of magnetic flux penetrating into the inside of the superconductor (2) is constant, and therefore it behaves as if it were a superconductor (2).
The permanent magnet part (
3) appears to be penetrated, and the rotating body (1) is restrained relative to the superconductor (2). Therefore, the rotating body (1
) will be supported in the axial and radial directions in an extremely stable floating state.

At each end of the permanent magnet part (3), the magnetic comrades of the same polarity of the plurality of permanent magnets (4a), (4b), and (4c) repel each other, and a single permanent magnet is provided in the permanent magnet part. The magnetic flux extends in the direction of the rotation axis compared to the case where the Therefore, more magnetic flux enters the superconductor (2), which is placed opposite the lower end surface of the permanent magnet part (3), and the superconductor (2) traps much of the magnetic flux, increasing the load capacity. and improved rigidity.

In addition to the superconductor (2) described above, a superconductor (6) shown by a chain line in FIG. 1 may be provided. This second superconductor (6) is arranged so as to face the outer peripheral surface of the permanent magnet part (3) at a distance in the radial direction. )
is supported. Therefore, the rigidity of the entire bearing device is further improved. Note that this superconductor (6) may be a complete annular body or a part of the annular body.

FIG. 2 schematically shows the main parts of a superconducting bearing device according to a second embodiment.

In this case, the permanent magnet part (
3) Superconductors (2), (6), and (7) are provided so as to face the lower end surface, outer peripheral surface, and upper end surface of the superconductor, respectively, and the rotating body (1) is supported by these superconductors (2), (6), and (7).

FIG. 3 schematically shows the main parts of a superconducting bearing device according to a third embodiment.

[0031] Also in this case, the permanent magnet portion (8) includes a plurality of annular permanent magnets (
9a) (9b) and the non-magnetic material (10) between them, each permanent magnet (9a) (
9b) has magnetism with opposite polarities on both sides in the radial direction, and opposing sides of the adjacent permanent magnets (9a) and (9b) have magnetism with the same polarity. For example, the inner permanent magnet (
The inner part of 9a) has a north pole magnetism, and the outer part has a south pole magnetism, and the inner part of the outer permanent magnet (9b) has a south pole magnetism, and the outer part has a north pole magnetism. The same applies when there are three or more permanent magnets.

In the case of the third embodiment, adjacent permanent magnets (9
a) Since magnetic comrades of the same polarity repel each other on the opposite sides of (9b), the magnetic flux swells in both the rotation axis direction and the radial direction, and is arranged so as to face the lower end surface of the permanent magnet part (8). The amount of magnetic flux that enters the superconductor (2) increases.

[0033] Also in this case, a superconductor may be added facing the outer peripheral surface or upper end surface of the permanent magnet portion (8).

FIG. 4 schematically shows the main parts of a superconducting bearing device according to a fourth embodiment.

In this case, the permanent magnet section (11) includes a plurality of annular permanent magnets (12a) (12b) arranged at intervals in the direction of the rotation axis, and a non-magnetic material (13) between them.
), and each permanent magnet (12
a) (12b) is a permanent magnet (12a) (12b) whose both sides in the direction of the rotation axis are magnetically opposite in polarity to each other;
The opposite ends of the two are magnetized with the same polarity. for example,
The top end of the upper permanent magnet (12a) has an N-pole magnetism and the bottom end has an S-pole magnetism, and the lower permanent magnet (12b) has an S-pole magnetism at the top end and an N-pole magnetism at the bottom end. . The same applies when there are three or more permanent magnets.

In the case of the fourth embodiment as well, the adjacent permanent magnets (
Since magnetic comrades of the same polarity repel each other at the opposing ends of 12a and 12b, the magnetic flux swells in both the rotational axis direction and radial direction, and is arranged to face the lower end surface of the permanent magnet part (11). The amount of magnetic flux that enters the superconductor (2) increases.

[0037] In this case as well, a superconductor may be added facing the outer peripheral surface or upper end surface of the permanent magnet portion (11).

FIG. 5 schematically shows the main parts of a superconducting bearing device according to a fifth embodiment.

This example is based on the superconductor (2) of the third example.
) is provided with a superconductor (6) facing the outer peripheral surface of the permanent magnet part (8).

[0040] Also in this case, as described in the third embodiment, the magnetic flux swells in both the rotation axis direction and the radial direction, and the superconductor is disposed so as to face the outer peripheral surface of the permanent magnet part (8). (6) More magnetic flux enters.

FIG. 6 schematically shows the main parts of a superconducting bearing device according to a sixth embodiment.

This example is based on the superconductor (2) of the fourth example.
) Instead, a superconductor (6) is provided facing the outer peripheral surface of the permanent magnet part (11).

In this case as well, as described in the fourth embodiment, the magnetic flux swells in both the rotation axis direction and the radial direction, and the superconductor is disposed so as to face the outer peripheral surface of the permanent magnet section (11). (6) More magnetic flux enters.

[0044]

According to the first and second inventions, as described above, it is possible to stably rotationally support a rotating body with a simple structure.

In particular, in the case of the first invention, the permanent magnet portion is
Consisting of a plurality of annular permanent magnets arranged at intervals in the radial direction of a rotating body and a non-magnetic material between them, both ends of each permanent magnet in the direction of the rotation axis receive magnetism of opposite polarity. Since the same ends of all the permanent magnets in the rotational axis direction are magnetized with the same polarity, load capacity and rigidity can be improved.

[0046] In both the first and second inventions,
The permanent magnet section is composed of a plurality of annular permanent magnets arranged at intervals in the radial direction and a non-magnetic material between them, and both sides of each permanent magnet in the radial direction generate magnetism of opposite polarity. Since the opposing sides of the adjacent permanent magnets are magnetized with the same polarity, the load capacity and rigidity can be improved. In addition, the permanent magnet section is composed of a plurality of annular permanent magnets arranged at intervals in the direction of the rotation axis and a non-magnetic material between them, and both ends of each permanent magnet in the direction of the rotation axis are mutually connected to each other. Load capacity and rigidity can be improved by having magnetism of opposite polarity and opposing ends of adjacent permanent magnets having magnetism of the same polarity.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal cross-sectional view of the main parts of a superconducting bearing device showing a first embodiment of the present invention.

FIG. 2 is a schematic vertical sectional view of the main part of a superconducting bearing device showing a second embodiment of the present invention.

FIG. 3 is a schematic vertical sectional view of the main part of a superconducting bearing device showing a third embodiment of the present invention.

FIG. 4 is a schematic vertical sectional view of the main part of a superconducting bearing device showing a fourth embodiment of the present invention.

FIG. 5 is a schematic vertical sectional view of the main part of a superconducting bearing device showing a fifth embodiment of the present invention.

FIG. 6 is a schematic longitudinal sectional view of the main part of a superconducting bearing device showing a sixth embodiment of the present invention.

[Explanation of symbols]

Claims (7)

[Claims] 1. A disk-shaped permanent magnet section provided concentrically on a rotating body, and a permanent magnet section arranged to face an end face of the permanent magnet section at a distance in the direction of the rotational axis of the rotating body. the permanent magnet section is provided on the rotating body so that the magnetic flux distribution around the rotational axis of the rotating body does not change due to rotation, and the superconductor is provided with the superconductor A superconducting bearing that allows magnetic flux to enter from a permanent magnet portion, and is arranged at a separate position where a predetermined amount of magnetic flux from the permanent magnet portion enters, and at a position where the distribution of the penetrating magnetic flux does not change due to the rotation of the rotating body. Device. 2. The permanent magnet section includes a plurality of annular permanent magnets arranged at intervals in the radial direction of the rotating body and a non-magnetic material between them, and the rotation axis of each permanent magnet is 2. The superconducting bearing device according to claim 1, wherein both end portions in the center direction are charged with magnetism of opposite polarity, and the same end portions of all the permanent magnets in the rotational axis direction are charged with magnetism of the same polarity. 3. The permanent magnet section includes a plurality of annular permanent magnets arranged at intervals in the radial direction and a non-magnetic material between them, and both sides of each permanent magnet in the radial direction 2. The superconducting bearing device according to claim 1, wherein the permanent magnets are magnetized with opposite polarities, and opposite sides of adjacent permanent magnets are magnetized with the same polarity. 4. The permanent magnet section includes a plurality of annular permanent magnets arranged at intervals in the direction of the rotation axis, and a non-magnetic material between them, and each permanent magnet is arranged at intervals in the direction of the rotation axis. 2. The superconducting bearing device according to claim 1, wherein both ends are magnetized with opposite polarities, and opposing ends of adjacent permanent magnets are magnetized with the same polarity. 5. A disk-shaped permanent magnet part provided concentrically on the rotating body, and a disc-shaped permanent magnet part arranged to face the outer circumferential surface of the permanent magnet part at a distance in the radial direction of the rotating body. and a superconductor, the permanent magnet section is provided on the rotating body so that the magnetic flux distribution around the rotation axis of the rotating body does not change due to rotation, and the superconductor is provided with the permanent magnet A superconducting bearing device that allows magnetic flux to penetrate from the magnet portion, and is arranged at a separate position where a predetermined amount of magnetic flux from the permanent magnet portion penetrates, and at a position where the distribution of the penetrating magnetic flux does not change due to the rotation of the rotating body. . 6. The permanent magnet section includes a plurality of annular permanent magnets arranged at intervals in the radial direction and a non-magnetic material between them, and both sides of each permanent magnet in the radial direction 6. The superconducting bearing device according to claim 5, wherein the opposing sides of adjacent permanent magnets are magnetized with opposite polarity and the opposite sides of the adjacent permanent magnets are magnetized with the same polarity. 7. The permanent magnet section includes a plurality of annular permanent magnets arranged at intervals in the direction of the rotation axis, and a non-magnetic material between them, 6. The superconducting bearing device according to claim 5, wherein both ends are magnetized with opposite polarities, and opposing ends of adjacent permanent magnets are magnetized with the same polarity.