JPH05172145A - Super-conductive magnetic bearing device - Google Patents

Abstract

PURPOSE:To obtain a super-conductive magnetic bearing device which can support a rotary shaft in radial and thrust directions by means of only one permanent magnet. CONSTITUTION:Super-conductive materials 12, 13 having tapered inner peripheral surfaces are arranged in the upper end lower parts of a housing 11, and permanent magnets 15, 16 having tapered outer peripheral surface are arranged on a rotary shaft 14, facing the tapered inner peripheral surfaces of the super- conductive materials 12, 13, and a lower centering jig 17 is provided facing the lower end face of the rotary shaft 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting magnetic bearing device, and more particularly to a superconducting magnetic bearing device in which a rotating shaft is axially supported with a superconducting material and a permanent magnet facing each other.

[0002]

2. Description of the Related Art Recently, a superconducting magnetic bearing device using a magnetic levitation mechanism in which a superconducting material and a permanent magnet are opposed to each other for magnetic levitation is being developed. The superconducting material has a Meissner effect and a pinning effect. The Meissner effect refers to perfect diamagnetism exhibited by the superconducting material. Since the superconducting material has a property of preventing an invasion of an external magnetic field, the magnetic field repels regardless of the N and S poles. The pinning effect is a force that fixes the magnetic flux that has entered the superconducting material so that it does not move.

FIG. 4 is a sectional view of a conventional superconducting magnetic bearing device constructed by the Meissner effect and the pinning effect. Referring to FIG. 4, an upper superconducting material 2 and a lower superconducting material 3 are arranged in a housing 1, and an outer peripheral portion of a rotating shaft 4 is supported in a radial direction, so that the upper superconducting material is orthogonal to the axial direction. The upper radial permanent magnet 5 facing the material 2
And a lower radial permanent magnet 6 is provided so as to face the lower superconducting material 3. Further, in order to support the thrust direction of the rotating shaft 1 on the flange surface of the rotating shaft 1, an upper thrust permanent magnet 7 is provided so as to axially face the upper superconducting material 2, and the lower superconducting material 3 is provided. Lower thrust permanent magnets 8 are provided so as to face each other in the axial direction. Further, an upper centering mechanism 9 is provided on the upper part of the rotary shaft 1, and a lower centering mechanism 10 is provided on the lower part.

In order to utilize the pinning effect of the upper superconducting material 2 and the lower superconducting material 3 described above, the rotating shaft 1 is held at its rotation center in advance before the upper superconducting material 2 and the lower superconducting material 3 are cooled. While moving the lower centering mechanism 10 to the upper side, the upper thrust permanent magnet 7 provided on the rotary shaft 1 is moved.
In the state in which the upper superconducting material 2 is brought close to the upper superconducting material 2, the upper superconducting material 2 is cooled to a critical temperature or lower, and the magnetic flux from the upper thrust permanent magnet 7 is pinned. After that, the lower centering mechanism 10 is moved downward again to cool the lower superconducting material 3 to a temperature below the critical temperature, so that the rotating shaft 4 does not move due to the Meissner effect and the pinning effect of the upper superconducting material 2 and the lower superconducting material 3. Contact supported.

[0005]

However, in the conventional superconducting magnetic bearing device shown in FIG. 4, only the magnetic flux from the upper thrust permanent magnet 7 and the lower thrust permanent magnet 8 can be expected to have the pinning effect. However, the magnetic flux from the upper radial permanent magnet 5 and the lower radial permanent magnet 6 cannot be positively pinned, and the pinning effect of the upper superconducting material 2 and the lower superconducting material 3 cannot be effectively utilized. there were.

Therefore, the main object of the present invention is to
It is an object of the present invention to provide a superconducting magnetic bearing device capable of supporting the radial direction and the thrust direction of a rotating shaft by a single permanent magnet.

[0007]

The invention according to claim 1 is
A superconducting magnetic bearing device in which a superconducting material and a permanent magnet are opposed to each other so as to rotatably support a rotating shaft, in which confronting surfaces of the superconducting material and the permanent magnet have the same taper angle or an angle close to the same taper angle. Is composed of.

The invention according to claim 2 further comprises a centering mechanism for moving the rotating body in the axial direction of the rotating shaft before cooling the superconducting material to a temperature below the critical temperature.

According to a third aspect of the invention, the invention is further configured to include a housing member which is further divided into two in the rotation axis direction, to which a superconducting material or a permanent magnet is attached and which is movable in the rotation axis direction.

According to a fourth aspect of the present invention, there is provided a superconducting magnetic bearing device in which a superconducting material and a permanent magnet are opposed to each other so as to rotatably support a rotary shaft, and one of the opposing surfaces of the superconducting material and the permanent magnet has a conical shape. , And the other is a pyramid-shaped plate.

[0011]

In the superconducting magnetic bearing device according to the present invention, the facing surfaces of the superconducting material and the permanent magnet are formed in a conical shape having the same taper angle or an angle close to the same taper angle, or one of them is a conical shape. And the other is formed in a pyramidal shape, one radial magnet can support the radial direction and the thrust direction of the rotating shaft.

[0012]

1 is a sectional view of an embodiment of the present invention.
Referring to FIG. 1, a superconducting material 12 is formed on the upper and lower sides of a housing 11 so that the inner peripheral surfaces thereof are tapered.
13 are arranged. The rotating shaft 14 has superconducting materials 12, 13
Permanent magnets 15 and 16 each having an outer peripheral surface formed in a tapered shape are arranged so as to face the tapered surface of. A lower centering jig 17 is provided at the lower portion of the housing 11 so as to face the lower end surface of the rotary shaft 14.

In the superconducting magnetic bearing device shown in FIG. 1, when the rotating shaft 14 is pushed up by the lower centering jig 17 before being rotated, the superconducting material 12 and the permanent magnet 15 having the same taper shape are separated from each other. It is held and makes contact with the rotating shaft 14 of the rotating body. In this state, the superconducting material 12 is cooled to a temperature below the critical temperature to pin the magnetic flux from the permanent magnet 15 to the superconducting material 12. After that, the lower centering jig 17 is moved downward again, and then the superconducting material 13 is cooled to the critical temperature or lower, so that the rotating shaft 14 is completely in non-contact due to the Meissner effect and the pinning effect of the superconducting material 13. Supported. In this way, by making the superconducting materials 12 and 13 and the permanent magnets 15 and 16 facing each other into a conical shape having the same taper angle, the permanent magnets 1 to the entire superconducting material 12 used.
Magnetic flux from 5 can be pinned and superconducting material 1
The pinning effect of 2 and 13 can be further brought out, and the structure for fixing the rotary shaft 14 to the rotary shaft in advance can be simplified.

FIG. 2 is a sectional view of another embodiment of the present invention. With reference to FIG. 2, the housing is divided into upper and lower parts, and includes an upper housing 21 and a lower housing 22, and these upper housing 21 and lower housing 22 are connected by a centering guide 23. Then, the lower housing 22 can be moved up and down while maintaining the same axis as the upper housing 21, and can be fixed to the centering guide 23 by a screw 24 at an arbitrary position. In the upper housing 21,
A superconducting material 25 whose inner peripheral surface is tapered is fixed, and a superconducting material 26 whose inner peripheral surface is tapered is fixed to the lower housing 22. A permanent magnet 28 is provided above the rotating shaft 27 so as to face the superconducting material 25, and the outer peripheral surface of the permanent magnet 28 is formed to have the same tapered shape as the superconducting material 25. A permanent magnet 29 is provided below the rotary shaft 27, and the outer peripheral surface of the permanent magnet 29 is formed to have the same tapered shape as the superconducting material 26.

As shown in FIG. 2, since the lower housing 22 can be moved in the vertical direction with respect to the upper housing 21, the respective gaps between the superconducting material 25 and the permanent magnet 28 and between the superconducting material 26 and the permanent magnet 29 are made. It can be set freely. Then, before cooling the superconducting materials 25 and 26, the lower housing 22 is moved with respect to the upper housing 21 so that the superconducting materials 25 and 26 and the permanent magnets 28 and 29, which are paired in the upper and lower sides, are brought close to or in contact with each other. After that, by cooling the superconducting materials 25 and 26 to below the critical temperature,
Magnetic fluxes from the permanent magnets 28 and 29 facing each other are pinned to the entire superconducting materials 25 and 26. After pinning the magnetic flux, again the upper housing 21 and the lower housing 2
2 is moved to set the superconducting material 25 and the permanent magnet 28, and the superconducting material 26 and the permanent magnet 29 to appropriate gaps, respectively, and the lower housing 22 is fixed to the centering guide 23 by the screw 24. Thus, the rotating shaft 27 can be stably rotated. In the embodiment shown in FIG. 2, the magnetic flux can be pinned by operating the superconducting materials 25 and 26 once, and the rotating shaft 27 can obtain stable rotation performance due to the pinning effect.

FIG. 3 is a diagram showing a main part of still another embodiment of the present invention. In the embodiment shown in FIG. 1 described above, the inner peripheral surfaces of the superconducting materials 12 and 13 provided on the housing 11 and the outer peripheral surfaces of the permanent magnets 15 and 16 provided on the rotating shaft 14 are conical so as to have the same taper angle. Although the plate-shaped superconducting material 18 is used in the embodiment shown in FIG. 3, the superconducting material 18 is arranged close to the taper angle of the permanent magnet 15 to form a pyramid.

In the embodiments shown in FIGS. 1 to 3, the superconducting material is provided on the housing side and the permanent magnet is provided on the rotating shaft side. On the contrary, the permanent magnet is provided on the housing side and the rotating shaft is provided. A superconducting material may be provided on the side. In the case of the example shown in FIG. 3, a plate-shaped permanent magnet may be used as the permanent magnet provided in the housing 11.

[0018]

As described above, according to the present invention, the opposing surfaces of the superconducting material and the permanent magnet have a conical shape having the same taper angle or an angle close to the same taper angle, or the superconducting material and the permanent magnet face each other. Since one of the surfaces is formed in a conical shape and the other surface is formed in a pyramid shape by the plate material, one radial magnet can support the radial direction and the thrust direction of the rotary shaft.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view of another embodiment of the present invention.

FIG. 3 is a diagram showing a main part of still another embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional superconducting magnetic bearing device.

[Explanation of symbols]

 11 Housing 12, 13, 25, 26 Superconducting Material 14, 27 Rotating Shaft 15, 16, 28, 29 Permanent Magnet 17 Lower Centering Mechanism 21 Upper Housing 22 Lower Housing 23 Centering Guide 24 Screw

Claims (4)

[Claims] 1. A superconducting magnetic bearing device in which a superconducting material and a permanent magnet are opposed to each other so as to rotatably support a rotating shaft. In the superconducting magnetic bearing device, opposing surfaces of the superconductor and the permanent magnet have the same taper angle or nearly the same taper angle. A superconducting magnetic bearing device characterized by being formed in a conical shape having an angle. 2. The superconducting bearing device according to claim 1, further comprising a centering mechanism for moving the rotating body in the axial direction of the rotating shaft before cooling the superconducting material to a critical temperature or lower. 3. Further divided into two in the rotation axis direction,
Superconducting material or the permanent magnet is attached to each,
The superconducting magnetic bearing device according to claim 1, further comprising a housing member that is movable in the rotation axis direction. 4. In a superconducting magnetic bearing device in which a superconducting material and a permanent magnet are opposed to each other so as to rotatably support a rotating shaft, one of the opposing surfaces of the superconducting material and the permanent magnet is formed in a conical shape, and the other is formed. The superconducting magnetic bearing device is characterized in that it is formed of a plate material into a pyramidal shape.