JPH0681842A - Superconductive bearing device - Google Patents

Abstract

PURPOSE:To carry out high speed rotation of a rotary unit by decreasing deflec tion of the rotary unit, and stably supporting it in a noncontact condition. CONSTITUTION:A superconductive bearing device comprises an annular permanent magnet part 2 concentrically provided in a rotary unit 1 and an annular superconductor part arranged in a fixed part so as to be opposed with a space in the rotary shaft center direction relating to an end face of the permanent magnet part 2. The permanent magnet part 2 is formed of a disk 5 fixedly provided in the rotary unit 1 and an annular permanent magnet 6 arranged in the disk 5. A position adjusting screw 8 possible to adjust a position of the permanent magnet 6 relating to the disk 5 is provided in the permanent magnet part.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In recent years, a superconducting bearing device has been developed which can support a rotating body in a non-contact state with a fixed portion.

As a superconducting bearing device of this type, an annular permanent magnet portion concentrically provided on a rotating body and an end face in the rotating shaft center direction of the permanent magnet portion are spaced from each other in the rotating shaft direction of the rotating body. And the annular superconductor portion arranged to face each other, the permanent magnet portion is fixedly and concentrically provided on the rotating body, and an annular groove is formed on the surface facing the superconductor portion. And a single annular permanent magnet which is fitted in the groove and whose center is concentric with the center of rotation of the rotating body.

In this superconducting bearing device, during operation, first, the center of the annular superconductor portion arranged in the rotating body and the fixed portion are aligned with each other, and further, the rotating body and the fixed portion are axially separated from each other. By cooling the body and holding it in a superconducting state, the magnetic flux generated from the permanent magnet part is allowed to enter the inside of the superconductor to be restrained, and as a result, the rotating body is axially moved with respect to the fixed part by so-called pinning force. And it is designed to be supported in a non-contact state in the radial direction. Then, the rotating body is rotated by, for example, a high frequency electric motor arranged around the rotating body.

[0005]

However, it is inevitable that the surface magnetic flux density of the surface of the annular permanent magnet facing the superconductor portion varies in the circumferential direction, and the center of the magnetic field takes into consideration the variation. It will deviate from the center of the magnet. Therefore, in the conventional device, the center of the rotating body and the center of the annular superconductor part deviate from the center of the magnetic field of the permanent magnet, and as a result, radial runout occurs in the rotating body and the rotating body does not move. There is a problem that it cannot be stably supported in the contact state. Moreover, there is a problem that the rotating body cannot be rotated at a high speed because 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.

[0007]

A superconducting bearing device according to the present invention has an annular permanent magnet portion concentrically provided on a rotating body and a space in the direction of the rotation axis from the end face of the permanent magnet portion. A superconducting bearing device comprising an annular superconductor portion arranged in the fixed portion so as to face each other, and capable of supporting the rotating body in a non-contact state with respect to the fixed portion, wherein the permanent magnet portion is Comprising a disc fixedly provided on the rotating body and an annular permanent magnet arranged on the disc, and the permanent magnet portion being provided with means for adjusting the position of the permanent magnet with respect to the disc. Is.

[0008]

According to the present invention, after the operation is started, when radial deviation is generated in the rotating body, the position adjusting means moves the position of the permanent magnet with respect to the disk, whereby the surface magnetic flux density of the permanent magnet is increased. The center of the magnetic field considering the variation in the circumferential direction can be close to or coincide with the center of the annular superconductor portion. Therefore, the runout of the rotating body is reduced.

[0009]

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

1 and 2 schematically show the structure of a main part of a superconducting bearing device according to an embodiment of the present invention.

In FIGS. 1 and 2, the superconducting bearing device is provided with a vertical shaft-shaped rotating body (1). Although illustration is omitted, the rotating body (1) is rotated at a high speed by a high-frequency driving electric motor including a rotor mounted on the rotating body (1) and a stator mounted on a fixed part and arranged around the rotor. It is designed to be used. A horizontal disk-shaped permanent magnet part (2) is concentrically provided on the rotating body (1), and a space is provided in the direction of the rotation axis of the rotating body (1) with respect to the lower end surface of the permanent magnet part (2). The annular superconductor parts (3) are arranged on the fixed part (4) so as to face each other.

The permanent magnet portion (2) is provided with a horizontal disk (5) fixedly provided on the rotating body (1) and made of, for example, copper or non-magnetic stainless steel. An annular hanging wall (5a) is integrally formed on the outer peripheral edge of the lower surface of the disc (5) over the entire circumference. An annular permanent magnet (6) is arranged on the lower surface of the disc (5) surrounded by the hanging wall (5a). The hanging wall (5a) has a plurality of, for example, four screw holes at equal angular intervals in the circumferential direction.
(7) is formed in a penetrating shape, and each screw hole (7) has a position adjusting screw (8) that can adjust the position of the permanent magnet (6) with respect to the disc (5) from the outside. . Position adjustment screw
The number of (8) is not limited to four and may be 3 or more. When,
An annular permanent magnet (6) arranged on the disc (5) is provided.

A ring (9) is fitted and fixed to the outer peripheral surface of the permanent magnet (6). Each position adjustment screw (8) and ring
A pressing member (11) that presses the permanent magnet (6) through the ring (9) by advancing the screw (8) is interposed between the pressing member (11) and (9). The screw (8) side of the pressing member (11), that is, the surface facing outward is a flat surface, and the ring (9) side, that is, the surface facing inward, is an arc surface. An annular support plate (12) is attached to the lower end of the hanging wall (5a) to prevent the permanent magnet (6) from falling off the disc (5). The radial inner peripheral edge of the support plate (12) is located below the ring (9), and by supporting the ring (9), the disk (5) of the permanent magnet (6) fixed to it. Is prevented from falling off. .

The superconductor part (3) is provided with a horizontal annular body (13) made of, for example, copper or non-magnetic stainless steel and fixed to the fixing part (4). A hole (13a) is formed at the center of the annular body (13) to pass vertically through it.
The rotating body (1) is passed through 3a) with a gap. Annular body
An annular hollow part (14) is formed in the (13), and a plurality of disc-shaped superconductors (15) are arranged in the annular hollow part (14) at equal intervals in the circumferential direction and close to each other. A cooling fluid supply pipe (16) and a discharge pipe (17) are arranged in the annular body (13) so as to communicate with the annular hollow portion (14) therein. The cooling fluid supply pipe (16) and the discharge pipe (17) are connected to a cooling device or the like via a temperature control unit (not shown). Then, the cooling fluid supply pipe (16) by the cooling device, the annular hollow portion (1
The cooling fluid is circulated through 4) and the cooling fluid discharge pipe (17), and the superconductor (15) is cooled by the cooling fluid filled in the hollow portion (14).

The superconductor (15) is a type 2 superconductor,
Yttrium-based high temperature superconductor such as YBa ₂ Cu ₃
Consisting O _x within the bulk normally conductive particles _(Y 2 _Ba 1 C
u ₁ ) are mixed uniformly, and the permanent magnet part
It has the property of restraining the penetration of the magnetic flux emitted from (2). And, the superconductor (15) is at the separated position where the magnetic flux of the permanent magnet part (2) penetrates by a predetermined amount and at the same time as the rotating body.
It is placed at a position where the distribution of the magnetic flux penetrating does not change due to the rotation of (1).

When operating the superconducting bearing device, the rotating body
(1) is moved up with respect to the fixed part (4) to position the rotating body (1) relative to the fixed part (4). This allows
Axial and radial relative positioning of the permanent magnet part (2) and the superconductor part (3) is performed. Then, each superconductor
(15) is cooled by a cooling fluid circulated in the annular hollow portion (14), and is kept in a second-type superconducting state. Then, most of the magnetic flux generated from the permanent magnet part (2) of the rotating body (1) enters the inside of the superconductor (15) and is restricted (pinning phenomenon). Here, since the superconductor (15) has the normal conductor particles uniformly mixed therein,
(15) The distribution of the magnetic flux penetrating into the interior becomes constant, and the so-called pinning force causes the permanent magnet part (2) to the superconductor (15).
At the same time, the rotating body (1) is restrained. Therefore, the rotating body
In (1), it will be supported in the axial direction and the radial direction in a stable floating state. At this time, the magnetic flux that has entered the superconductor (15) does not become a resistance that prevents rotation.

Then, the rotating body (1) is rotated by the high frequency electric motor. Then, the superconductor part of the permanent magnet (6)
(3) The surface magnetic flux density on the surface facing (3) varies in the circumferential direction.
Due to the deviation from the center of rotation of (1) and the center of the annular superconductor part (3), radial runout occurs in the rotating body (1). This fluctuation also occurs when the rotating speed of the rotating body (1) is low. Therefore, when the rotation speed of the rotating body (1) is low, the disc (5)
Move the position of the permanent magnet (6) with respect to. Then, the center of the magnetic field comes close to or coincides with the centers of the rotating body (1) and the annular superconducting portion (3), which reduces the deflection of the rotating body (1). After that, the rotating body (1) is rotated at high speed.

In the above embodiment, the means for adjusting the position of the annular permanent magnet with respect to the disk is a screw, but the means is not limited to this, and can be changed as appropriate.

[0019]

As described above, according to the superconducting bearing device of the present invention, the runout of the rotating body can be reduced.
Therefore, the rotating body can be stably supported in a non-contact state, and as a result, the rotating body can rotate at high speed.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along the line II-II in FIG.

[Explanation of symbols]

 1 Rotating Body 2 Annular Permanent Magnet Section 3 Annular Superconductor Section 4 Fixed Section 5 Horizontal Disk 6 Annular Permanent Magnet 8 Position Adjustment Screw

Claims (1)

[Claims] 1. A ring-shaped permanent magnet portion concentrically provided on a rotating body, and a ring-shaped permanent magnet portion arranged on a fixed portion so as to face an end surface of the permanent magnet portion with a gap in a rotation axis direction. And a superconducting bearing unit capable of supporting a rotating body in a non-contact state with a fixed portion, wherein the permanent magnet portion is a disk fixedly provided on the rotating body. And a ring-shaped permanent magnet arranged on the disc, wherein the permanent magnet portion is provided with means for adjusting the position of the permanent magnet with respect to the disc.