JPH0681844A - Assembly method for supercondctive bearing device - Google Patents

Abstract

PURPOSE:To carry out high speed rotation of a rotary unit by suppressing generation of deflection of the rotary unit, and stably supporting it in a noncontact condition, at the time of operating a built superconductive bearing device. CONSTITUTION:A circular hole 20 is concentrically formed with a permanent magnet 7 in a disk 5 of fixing the annular permanent magnet 7. The disk 5 is arranged relating to a superconductor part 3 with a space provided in its axial direction so that the circular hole 20 is placed concentrically to the superconductor part 3. A superconductor 10 of the annular superconductor part 3 is magnetic field-cooled by a magnetic field of the permanent magnet 7 and left as held in a superconductive condition. Under this condition, the disk 5 is rotated about the center of the superconductor part 3. Deflection in a radial direction in an internal peripheral surface of the circular hole 20, at the time of rotating the disk 5, is measured to find out the center of its rotation. A rotary unit insertion hole 23, having a diameter larger than the circular hole 20 and including it, is formed with this center of rotation serving as the center. A rotary unit is inserted and fixed to the disk 5 so as to be concentrical with the rotary unit insertion hole 23.

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 kind, an annular permanent magnet portion concentrically provided on a shaft-like rotating body and an end face in the rotating shaft center direction of this permanent magnet portion are arranged in the rotating shaft center direction of the rotating body. An annular superconductor portion arranged so as to face each other with a space, and the permanent magnet portion is fixedly and concentrically provided on the rotating body and has an annular concave portion on the surface facing the superconductor portion. It consists of a disk with a groove and an annular permanent magnet fitted into the groove and concentric with the rotating body.The superconductor part is close to the disk at equal intervals in the circumferential direction. A plurality of superconductors provided in such a manner is considered.

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 so-called pinning force causes the rotating body to move in the axial direction relative to the fixed part. 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 unavoidable 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 in consideration of this variation is the permanent magnet. It will deviate from the center of. As a result, when rotating the rotating body, radial runout occurs, and there is a problem that the rotating body cannot be stably supported in a non-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 method of assembling a superconducting bearing device which solves the above problems.

[0007]

SUMMARY OF THE INVENTION A method of assembling a superconducting bearing device according to the present invention includes an annular permanent magnet portion fixedly provided on a rotating body and a rotation axis direction with respect to an end face of the permanent magnet portion. A ring-shaped superconductor portion having a superconductor arranged in the fixed portion so as to face each other with a gap, and the permanent magnet portion has a magnet support body fitted around the rotating body, and a magnet support body. A method of assembling a superconducting bearing device comprising an annular permanent magnet fixed to a body, comprising forming a circular hole concentrically with the permanent magnet in a magnet support to which the annular permanent magnet is fixed. Place the body so that the circular hole is concentric with the superconductor part, with a gap in the axial direction from the superconductor part, and cool the magnetic field of the superconductor part of the annular superconductor part with the magnetic field of the permanent magnet. And keep it in a superconducting state To release the magnet support to levitate the magnet support magnetically, to rotate the magnet support around the center of the superconductor part in this state, the inner circumference of the circular hole when the magnet support rotates. Measuring the radial deflection of the surface to find the center of rotation of the magnet support, and forming a rotor insertion hole that has a larger diameter than the circular hole and that includes this center of rotation. , And that the rotor is inserted through the rotor insertion hole so as to be concentric therewith, and is fixed to the magnet support.

In the above, cooling the magnetic field of the superconductor of the annular superconductor section by the magnetic field of the permanent magnet means
This means that the superconductor is held in advance in the magnetic field of the permanent magnet, the magnetic flux generated from the permanent magnet is allowed to enter the superconductor, and the superconductor is cooled in this state to be in the superconducting state.

[0009]

First, a circular hole is formed concentrically with the permanent magnet in the magnet support to which the annular permanent magnet is fixed. Next, the magnet support is placed at a distance in the axial direction with respect to the superconductor part so that the circular hole is concentric with the superconductor part, and the superconductor in the annular superconductor part is placed in the magnetic field of the permanent magnet. After the magnetic field is cooled down by the magnetic field to keep it in the superconducting state, the magnet support is released to magnetically levitate the magnet support. Radial deflection occurs on the magnet support due to the center of the magnetic field deviating from the center of the permanent magnet in consideration of the circumferential variation in the surface magnetic flux density of the surface facing the superconductor portion. Therefore, when the radial deflection of the inner peripheral surface of the circular hole during the rotation of the magnet support is measured to find the center of rotation of the magnet support, this center of rotation corresponds to the superconductor part of the annular permanent magnet. It coincides with the center of the magnetic field in consideration of the circumferential variation of the surface magnetic flux density of the facing surface. Then, with this center of rotation as the center, a rotary body through hole having a diameter larger than and including the circular hole is formed, and the rotary body is inserted through the rotary body through hole so as to be concentric therewith. When fixed to the magnet support, the center of the magnetic field of the permanent magnet will coincide with the center of the rotating body.
Therefore, it is possible to suppress the wobbling of the rotating body.

[0010]

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

FIG. 3 schematically shows the structure of the main part of the superconducting bearing device.

In FIG. 3, the superconducting bearing device comprises 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. The rotor (1) has a horizontal disk-shaped permanent magnet part.
(2) is provided so as to face the lower end surface of the permanent magnet part (2) with a space in the direction of the rotation axis of the rotating body (1) and to be concentric with the rotating body (1). The annular superconductor part (3) is arranged on the fixed part (4).

The permanent magnet part (2) is provided with a horizontal disk (magnet support) (5) which is fitted around the rotating body (1) and is made of, for example, copper or non-magnetic stainless steel. An annular groove (6) is formed on the lower surface of the disc (5), and an annular permanent magnet (7) is fitted in the groove (6).

The superconductor portion (3) is provided with a horizontal annular body (8) made of, for example, copper or non-magnetic stainless steel and concentric with the rotating body (1) fixed to the fixed portion (4). A hole (8a) is formed at the center of the annular body (8) so as to vertically pass therethrough, and the rotating body (1) is passed through the through hole (8a) with a gap. An annular hollow portion (9) is formed in the annular body (8),
In this, a plurality of disc-shaped superconductors (10) are arranged at equal intervals in the circumferential direction and close to each other. The cooling fluid supply pipe (11) and the discharge pipe (12) are arranged in the annular body (8) so as to communicate with the annular hollow portion (9) therein. The cooling fluid supply pipe (11) and the discharge pipe (12) are connected to a cooling device or the like via a temperature control unit (not shown). Then, the cooling fluid supply pipe (1
1), the cooling fluid is circulated through the annular hollow portion 9 and the cooling fluid discharge pipe 12, and the superconductor 10 is cooled by the cooling fluid filled in the hollow portion 9.

The superconductor (10) 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 (10) 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).

1 and 2 show a method of assembling a superconducting bearing device.

In FIGS. 1 and 2, first, a circular hole (20) smaller than the outer diameter of the rotating body (1) is formed in the center of the disc (5), and an annular groove (6) is formed on the lower surface thereof. Are formed concentrically, and the annular permanent magnet (7) is fitted and retained in the groove (6). And the disk (5) to which the annular permanent magnet (7) is fixed
So that it is concentric with the superconductor part (3).
The superconductors (10) are arranged at intervals in the axial direction with respect to (3), and each superconductor (10) is cooled by a cooling fluid circulated in the annular hollow portion (9) to maintain the type 2 superconducting state. That is, each superconductor (10) is cooled in the magnetic field of the permanent magnet (7). Then, most of the magnetic flux generated from the permanent magnet (7) enters the inside of the superconductor (10) and is restricted (pinning phenomenon). Here, since the normal conductor particles are uniformly mixed in the superconductor (10), the distribution of the magnetic flux penetrating inside the superconductor (10) becomes constant, and the superconductor (10 ) Against a permanent magnet
(7) is bound. Therefore, the disk (5) is supported in a stable floating state. At this time, the magnetic flux that has entered the superconductor (10) does not become a resistance that prevents rotation.

Then, the disc (5) is rotated around the central axis of the superconductor portion (3) by an appropriate means. Then, the center of the magnetic field in consideration of the circumferential variation of the surface magnetic flux density of the surface of the permanent magnet (6) facing the superconductor part (3) is the center of the annular permanent magnet (7), that is, the disk (5). , And due to the deviation from the center of the annular superconductor part (3), the disk (5)
Radial runout occurs in the vertical direction (see the alternate long and short dash line in FIG. 2). Therefore, the probe (22) of the electric micrometer (21) is brought into contact with the inner peripheral surface of the circular hole (20) of the disc (5), and the radial deflection of the disc (5) is measured to determine the maximum deflection. Find part (A). And the center of the maximum runout (A) and the circular hole (20)
The center of the circular hole (20) on the straight line (L) connecting (O) and
The point (O1) deviated from (O) by a distance (d / 2) that is ½ of the maximum deflection (d) in the direction opposite to the maximum deflection (A) is obtained. This point (O1) is the center of rotation of the disk (5), and this center of rotation is the variation in the circumferential direction of the surface magnetic flux density of the surface of the annular permanent magnet (7) facing the superconductor section (3). It will coincide with the center of the magnetic field considered. Then, the rotation of the disk (5) is stopped and the cooling of the superconductor (10) is stopped, and the disk (5) has a diameter larger than that of the circular hole (20) with the point (O1) as the center. A rotary body insertion hole (23) including this is formed (see the two-dot chain line in FIGS. 1 and 2). Finally, when the rotor (1) is inserted through the rotor insertion hole (23) so as to be concentric and fixed, the center of the magnetic field of the permanent magnet (7) becomes
It will coincide with the center of (1). Finally, take a dynamic balance. Thus, the superconducting bearing device is assembled.

When the superconducting bearing device is operated, after the relative positioning between the rotating body (1) and the annular superconductor portion (3), the superconductor (10) is cooled in the same manner as above. Hold in the state of type 2 superconductivity. Then, similarly to the above, the rotating body (1) is constrained to the superconductor (10) together with the permanent magnet part (2) by the pinning force, and the rotating body (1) is stably levitated and the axial body is axially moved. Direction and radial direction will be supported. Then, the rotating body (1) is rotated by the high frequency electric motor. At this time, the occurrence of runout of the rotating body (1) is suppressed.

[0020]

As described above, according to the method of assembling the superconducting bearing device of the present invention, it is possible to suppress the occurrence of runout of the rotating body when the assembled superconducting bearing device is operated. 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 showing a state in which radial runout of an inner peripheral surface of a circular hole is measured during rotation of a disk according to an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a schematic vertical sectional view of a main part of a superconducting bearing device assembled according to the present invention.

[Explanation of symbols]

 1 Rotating Body 2 Annular Permanent Magnet Section 3 Annular Superconducting Section 4 Fixed Section 5 Disc 7 Annular Permanent Magnet 20 Circular Hole 23 Rotating Body Insertion Hole O Center of Circular Hole

Claims (1)

[Claims] 1. An annular permanent magnet portion fixedly provided on a rotating body, and a fixed portion disposed so as to face an end surface of the permanent magnet portion with a gap in the direction of the rotation axis, and A superconducting bearing device comprising an annular superconductor portion having a superconductor, wherein the permanent magnet portion comprises a magnet support fitted around the rotating body and an annular permanent magnet fixed to the magnet support. A method of assembling, in which a circular hole is formed concentrically with the permanent magnet on the magnet support to which the annular permanent magnet is fixed, and the circular hole is made concentric with the superconductor part. In addition, it is arranged with a gap in the axial direction with respect to the superconductor portion, and the superconductor of the annular superconductor portion is magnetically cooled by the magnetic field of the permanent magnet and kept in a superconducting state. Release to magnetically levitate the magnet support When, to rotate the magnet support around a center of the superconductor portion in this state,
Measure the radial deflection of the inner surface of the circular hole when the magnet support rotates, and find the center of rotation of the magnet support. A method of assembling a superconducting bearing device, comprising: forming a rotating body insertion hole including a rotating body insertion hole; and inserting the rotating body so as to be concentric with the rotating body insertion hole and fixing the rotating body insertion hole to the magnet support.