JP3232462B2 - Superconducting bearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid machine or a machine tool requiring high-speed rotation, an electric power storage device for converting surplus electric power into kinetic energy of a flywheel and storing the electric power.
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 member in a non-contact state has been developed as a bearing device capable of rotating a rotating member at high speed and high rigidity.

As this kind of superconducting bearing device, for example, one annular permanent magnet which is provided concentrically on a rotating body and has magnets of opposite polarities at both ends in the direction of the rotation axis,
It is conceivable to provide an annular superconductor arranged so as to face the end face of the permanent magnet at an interval in the direction of the rotation axis of the rotating body.

However, the above-described superconducting bearing device has a problem that the load capacity and the rigidity, particularly the load capacity and the rigidity in the direction of the rotation axis of the rotating body are insufficient. In addition, there is a problem in that the rigidity is insufficient and the rotating body is shaken, and the rotating body cannot be stably supported in a non-contact state.

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

[0006]

SUMMARY OF THE INVENTION A superconducting bearing device according to the present invention is a superconducting bearing device for supporting a rotating body in a non-contact state with respect to a fixed portion, wherein the superconducting bearing apparatus is concentric with the rotating body and is separated from each other. And the rotation axis of the rotating body
Two annular permanent magnets provided on the rotating body so that the magnetic flux distribution around the rotating body does not change due to the rotation of the rotating body, so that the two magnets are concentric with the rotating body and located between the two annular permanent magnets.
And a superconductor provided on the fixed portion, wherein opposing surfaces of the two permanent magnets are magnetized with polarities opposite to each other, and a distance between the two permanent magnets is attracted to each other. The superconductor is a permanent magnet
This allows the penetration of magnetic flux and the rotation of the rotating body.
It is placed in a position where the distribution of
Is what it is.

[0007]

[Function] It is concentric with the rotating body and spaced apart from each other .
Magnetic flux distribution around the rotation axis of the rotating body
Two annular permanent magnets provided on the rotating body so as not to be changed by the rotation of the rotating body , and a superconductor provided on the fixed portion so as to be concentric with the rotating body and located between the two annular permanent magnets. And the superconductor is the magnetic flux of the permanent magnet.
And the rotation of the rotating body
Therefore, it is placed in a position where the distribution of the intruding magnetic flux does not change.
The superconductor is cooled and becomes superconductive
Most of the magnetic flux generated from the permanent magnet of the rotating body
It penetrates into the conductor and is restrained (pinning phenomenon).
It is as if a permanent magnet of a rotating body is mounted on a virtual pin standing on the superconductor.
Now is penetrated, both permanent magnets and the superconductor is held in a state of being opposed to each other with a prescribed distance, rotating body Aki
It is supported in a non-contact state in the sial direction and the radial direction .

[0008] If the opposing surfaces of the two permanent magnets have magnets of opposite polarities, and if the interval between the two permanent magnets is set to a distance that attracts each other, the two permanent magnets may be connected to each other. Is extended in the direction connecting the two permanent magnets. Therefore, the magnetic flux penetrating through the superconductor increases, and the superconductor traps a large amount of magnetic flux. Moreover, the direction of the magnetic flux penetrating the superconductor is
Face the direction connecting both permanent magnets.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, corresponding parts are denoted by the same reference numerals.

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

The superconducting bearing device is a vertical shaft-shaped rotating body.
(1) is provided. The rotating body (1) is provided with two upper and lower horizontal disk-shaped permanent magnets (2a) (2b) concentrically with the rotating body (1) at intervals in the direction of the rotation axis. Permanent magnet section
(2a) The annular superconductor section (3) is located between the permanent magnet sections (2a) and (2b) so as to face the facing surface of the rotating body (1) at a distance from the facing surface of the rotating body (1). ) Is placed.

The permanent magnet portions (2a) and (2b) are fixedly fitted over the rotating body (1), for example, a sleeve (4) made of copper.
And two upper and lower horizontal disks (5a) and (5b) which are formed integrally with each other and which are opposed to each other at an interval in the direction of the rotation axis. On the upper surface of the upper disk (5a) and on the lower surface of the lower disk (5b), annular grooves (6a) (6b) concentric with the rotating body (1) are formed, respectively. These recesses (6a) (6
The ring-shaped permanent magnets (7a) and (7b) are fitted and fixed in b), respectively. The upper and lower ends of each of the permanent magnets (7a) (7b) are magnetized with opposite polarities, and the opposing surfaces of the permanent magnets (7a) (7b) are magnetized with polarities opposite to each other. For example, the upper ends of the permanent magnets (7a) and (7b) have N poles, and the lower ends have S poles. Further, the interval between the two permanent magnets (7a) and (7b) is set so as to attract each other. The magnetic flux distribution around the rotation axis is not changed by the rotation.

The superconductor part (3) is a fixed horizontal plate made of, for example, copper and provided on the housing (8).
(9) and the rotating body around the hole (9a) of the perforated disk (9)
It comprises a plurality of superconductors (10) embedded in the annular portion concentric with (1) so as to face the two permanent magnets (7a) and (7b). The volume of all superconductors (10) is equal.

[0014] superconductor (10) consists of those for example inside a normal conducting particles of a substrate made of _YBa 2 _Cu 3 Ox is yttrium-based high-temperature superconductor _(Y 2 _{Ba 1} Cu 1) uniformly mix, magnetic emanating from the permanent magnet (7a) (7b)
It has the property of penetrating bundles and restraining them. The superconductor (10) is arranged at a position where the distribution of the invading magnetic flux does not change due to the rotation of the rotating body (1).

A cooling case (not shown) is provided on the horizontal disk (9) of the superconducting bearing device, and a cooling device (11) is connected to the cooling case.

In operating the superconducting bearing device, the superconductor (10) is cooled by a cooling device (11) by a suitable refrigerant circulated in a cooling case of the disk (9), and is maintained in a superconducting state. Therefore, the permanent magnet (7a) of the rotating body (1)
Most of the magnetic flux emitted from (7b) enters the superconductor (10) and is restrained (pinning phenomenon). Here, in the superconductor (10), the normal conductor particles are uniformly mixed therein, so that the distribution of the magnetic flux penetrating into the superconductor (10) becomes constant, and therefore, as if the superconductor (10) The permanent magnets (7a) and (7b) of the rotating body (1) appear to penetrate the erected virtual pins, and the permanent magnet (2) passes through the superconductor (10).
a) The rotating body (1) is restrained together with (2b). Therefore, the rotating body (1) is supported in the axial direction and the radial direction while being extremely stably levitated.

The permanent magnets (7a) and (7b) of the permanent magnet portions (2a) and (2b)
Attract each other, the magnetic flux formed by the permanent magnets (7a) and (7b) extends in the direction of the rotation axis. For this reason,
The magnetic flux penetrating through the superconductor (10) increases, and the superconductor (10)
By trapping a large amount of magnetic flux, load capacity and rigidity are improved. In particular, since the direction of the magnetic flux penetrating the superconductor (10) is directed to the direction of the rotation axis, the load capacity and rigidity in the direction orthogonal to this, that is, in the radial direction are improved.

FIG. 2 schematically shows a main part of the superconducting bearing device of the second embodiment.

In this case, the rotating body (1) includes two inner and outer vertical cylindrical permanent magnet portions (20a) and (20b) at intervals in the radial direction of the rotating body (1). The two permanent magnet portions (2) are provided concentrically with the two permanent magnet portions (20a) and (20b) so as to face the opposed surfaces of the rotating body (1) at a distance in the radial direction.
A tubular superconductor portion (21) is arranged between 0a and (20b).

The permanent magnet portions (20a) (20b) are fixedly provided on the rotating body (1), for example, a horizontal disk (22) made of copper.
In addition, two inner and outer vertical cylindrical portions (23a) and (23b) are integrally formed at intervals in the radial direction. Inner peripheral surface of inner cylindrical part (23a) and outer cylindrical part (23b)
On the outer peripheral surface of each, an annular recess is formed concentrically with the rotating body (1).
(24a) and (24b) are formed, and these recesses (24a) (24
Ring permanent magnets (25a) and (25b) are fitted and fixed in b), respectively. Each permanent magnet (25a) (25b) has magnets of opposite polarities on both sides in the radial direction, and both permanent magnets (25a
a) The opposite surfaces of (25b) are magnetized with polarities opposite to each other. For example, the outer portions in the radial direction of the two permanent magnets (25a) and (25b) have N poles, and the inner portions have S poles. Further, the interval between the two permanent magnets (25a) (25b) is set so as to attract each other. The magnetic flux distribution around the rotation axis is not changed by the rotation.

Also in this case, as described in the first embodiment, the permanent magnets (25a) (25b) of the permanent magnet portions (20a) (20b) are used.
Attract each other, the magnetic flux formed by the two permanent magnets (25a, 25b) extends in the radial direction of the rotating body (1).
For this reason, the magnetic flux penetrating through the superconductor (10) increases, and the superconductor (10) traps a large amount of magnetic flux, thereby improving the load capacity and rigidity. In particular, the direction of the magnetic flux penetrating through the superconductor (10) points in the radial direction of the rotating body (1),
The load capacity and the rigidity in the direction orthogonal to this, that is, in the axial direction are improved.

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

In this case, the rotating body (1) is provided with two tapered cylindrical permanent magnet portions (30a, 30b) concentrically with the rotating body (1) at intervals in the direction of the rotation axis. ing. The two permanent magnet portions (30a) (30b) form an acute angle with respect to the rotation axis and face each other at a predetermined interval in a direction inclined upward and radially outward. An annular superconductor section is provided between the permanent magnet portions (30a) (30b) so as to face the facing surface of the permanent magnet portions (30a) (30b) at an interval in the radial direction of the rotating body (1). (31)
Is arranged.

The permanent magnet portions (30a) (30b) are integrally formed on the outer peripheral edge of a horizontal disk (32) made of, for example, copper and fixed to the rotating body (1), and It has two upper and lower annular inclined walls (33a) (33b) inclined downward toward the outside. On the upper surface of the upper inclined wall (33a) and on the lower surface of the lower inclined wall (33b), annular grooves (34a) (34b) are formed concentrically with the rotating body (1), respectively. The annular permanent magnets (35a) (35b) in these recesses (34a) (34b) respectively
Is fitted and fixed. Each permanent magnet (35a) (35b) has magnets of opposite polarities on both sides in the direction connecting the two inclined wall portions (33a) (33b), and opposing surfaces of both permanent magnets (35a) (35b). However, they are magnetized with opposite polarities. For example, the upper portions of the permanent magnets (35a) and (35b) in the direction of inclination have N poles, and the lower portions have S poles. In addition, both permanent magnets (3
5a) and (35b) are spaced from each other so as to attract each other. The magnetic flux distribution around the rotation axis is not changed by the rotation.

Also in this case, as described in the first embodiment, the permanent magnets (35a) (35b) of the permanent magnet portions (30a) (30b) are used.
Attract each other, the magnetic flux formed by the permanent magnets (35a) and (35b) extends in the direction connecting the inclined walls (33a) and (33b). For this reason, the magnetic flux penetrating through the superconductor (10) increases, and the superconductor (10) traps a large amount of magnetic flux, thereby improving the load capacity and rigidity. In particular, the direction of the magnetic flux penetrating the superconductor (10) forms an acute angle with respect to the axis of the rotating body (1) and is directed in a direction inclined upward and radially outward. Load capacity and rigidity are improved. Therefore, the load capacity and rigidity are improved in both the radial direction and the axial direction.

[0026]

【The invention's effect】 According to the superconducting bearing device of the present invention,
As described above, the rotating body is stably supported in a non-contact state.
Can be

Further, the more the magnetic flux penetrating the superconductor, because the superconductor is possible to trap more magnetic flux, thereby improving the load capacity and rigidity. In particular, since the direction of the magnetic flux penetrating the superconductor is in the direction connecting the two permanent magnets, the load capacity and rigidity in the direction orthogonal to the direction are improved.

[Brief description of the drawings]

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

FIG. 2 is a schematic longitudinal sectional view of a main part of a superconducting bearing device according to a second embodiment of the present invention.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating body 2 Permanent magnet part 4 Disk 7a, 7b Permanent magnet 10 Superconductor 25a, 25b Permanent magnet 35a, 35b Permanent magnet

Claims (1)

(57) [Claims] 1. A superconducting bearing device for supporting in a non-contact state with respect to the fixed portion of the rotary member becomes the rotating body concentrically, and when opposite to and separated from each other
In both cases, the magnetic flux distribution around the rotation axis of the rotating
The rotating body includes two annular permanent magnets provided so as not to be changed by rolling , and a superconductor provided concentrically with the rotating body and provided on a fixed portion so as to be located between the two annular permanent magnets. The opposite surfaces of the two permanent magnets are magnetized with opposite polarities, and the distance between the two permanent magnets is set so that they are attracted to each other .
The superconductor allows the magnetic flux of the permanent magnet to enter
And the distribution of invading magnetic flux due to the rotation of the rotating body
The superconducting bearing device is arranged at a position where does not change .