JPH05240248A - Superconductive magnetic bearing device - Google Patents

Abstract

PURPOSE:To provide a superconductive magnetic bearing device capable of sufficiently exhibiting the pin fixing effect of a superconductor and enhancing the radial rigidity. CONSTITUTION:A spindle 11 has a yolk 12 having an air gap, and on the spindle 11 side of the yolk 12, a permanent magnet 13 is provided. A ring superconductor 15 is provided in such a manner as to be inserted into the air gap of the yolk 12 from the inner surface of a housing 14. The magnetic flux generated by the permanent magnet 13 passes the superconductor 15 from one end of the yolk 12 and reaches the other end of the yolk. Thus, the magnetic flux can sufficiently exhibit pin fixing effect by passing the superconductor 15, and the radial rigidity can be enhanced.

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 superconducting material and a permanent magnet are opposed to each other to magnetically bearing a spindle or slider.

[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 a superconducting material. Since the superconducting material has a property of preventing an intrusion of an external magnetic field, the magnetic field repels regardless of whether it is the N pole or the S pole. 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 spindle 4 is supported in a radial direction. An upper radial permanent magnet 5 is provided so as to face 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 spindle 4 on the flange surface of the spindle 4, an upper thrust permanent magnet 7 is provided so as to axially oppose the upper superconducting material 2, and to the lower superconducting material 3. Lower thrust permanent magnet 8 so as to face the axial direction.
Is provided. Further, an upper centering mechanism 9 is provided above the spindle 4, and a lower centering mechanism 10 is provided below the spindle 4.

In order to utilize the pinning effect of the upper superconducting material 2 and the lower superconducting material 3 described above, while the upper superconducting material 2 and the lower superconducting material 3 are cooled, the spindle 4 is held in advance at the center of rotation thereof. , The lower centering mechanism 10 is moved upward, and the upper thrust permanent magnet 7 provided on the spindle 4 is brought close to the upper superconducting material 2. The magnetic flux from the magnet 7 is pinned. After that, the lower centering mechanism 10 is moved downward again to cool the lower superconducting material 3 below the critical temperature, so that the spindle 4 is not contacted by the Meissner effect and the pinning effect of the upper superconducting material 2 and the lower superconducting material 3. Supported.

[0005]

FIG. 5 is a diagram for explaining a state in which the magnetic flux of the upper thrust permanent magnet shown in FIG. 4 passes through the upper superconducting material 2. In particular, FIG. This is an example in which one ring-shaped one is used as the thrust permanent magnet 7, and FIG. 5B shows two ring-shaped permanent magnets 71 and 72 so that their N poles and S poles face the same direction, respectively. In FIG. 5C, the two ring-shaped permanent magnets 71 and 72 are arranged so that their N poles and S poles face in opposite directions. In each of the examples shown in FIGS. 5A to 5C, the magnetic flux from the permanent magnets 7, 71, 72 passes through the superconducting material 2 and it is necessary to increase the pinning effect of the magnetic flux on the superconducting material 2. Therefore, a non-magnetic material is used for the spindle 4.

However, the pinning of the superconducting material 2 is
There is a drawback in that the superconducting material 2 cannot be effectively used for pinning the magnetic flux because it is mainly limited to the portions near the facing surfaces of the permanent magnets 7, 71, 72.

Therefore, a main object of the present invention is to provide a superconducting magnetic bearing device capable of sufficiently exerting the pinning effect of the superconducting material and increasing the rigidity in the radial direction.

[0008]

The invention according to claim 1 is
A superconducting magnetic bearing device for magnetically bearing a spindle in a housing by utilizing a pinning effect of a superconducting material, comprising a yoke portion provided on the spindle and having an air gap, a permanent magnet provided in the yoke portion, and a yoke portion. A superconducting material annularly extending from the inner surface of the housing so as to be inserted into the air gap of the housing, and a centering member for axially moving the spindle before cooling the superconducting material to below the critical temperature. .

According to a second aspect of the present invention, there is provided a superconducting magnetic bearing device for magnetically bearing a spindle within a housing by utilizing a pinning effect of a superconducting material, the yoke portion having an air gap and provided on an inner surface of the housing. , A permanent magnet provided in the yoke part, a superconducting material that extends annularly from the outer peripheral surface of the spindle so as to be inserted into the air gap of the yoke part, and the spindle moves axially before cooling the superconducting material below the critical temperature. And a centering member for performing the adjustment.

According to a third aspect of the present invention, there is provided a superconducting magnetic bearing device in which the slider is levitated by utilizing the pinning effect of the superconducting material. The rail is provided and a superconducting material provided below the slider and interposed in the air gap of the rail.

[0011]

In the superconducting magnetic bearing device according to the present invention, a permanent magnet is provided on the yoke portion or rail having an air gap having a U-shaped cross section, and the superconducting material is inserted into the air gap. Since the magnetic flux of (4) passes through the superconducting material, the pinning effect of the superconducting material can be sufficiently exerted and the radial rigidity can be increased.

[0012]

1 is a sectional view of an embodiment of the present invention.
In FIG. 1, a spindle 11 is provided with yokes 12, 12 having an air gap above and below the spindle 11,
Ring-shaped permanent magnets 13, 13 are provided on the spindles 11 side of the yokes 12, 12. Further, ring-shaped superconducting materials 15 and 15 are provided so as to be inserted into the air gaps of the yokes 12 and 12 from the inner surface of the housing 14. An upper centering mechanism 9 and a lower centering mechanism 10 are provided on the upper and lower parts of the spindle 11 in the same manner as described above with reference to FIG.

As described above, in the embodiment shown in FIG.
The permanent magnet 13 is provided on the spindle 11 side of the yoke 12 having an air gap, and the superconducting material 1 is provided in the air gap.
By inserting 5, the magnetic flux from the permanent magnet 13 passes from the one side of the yoke 12 through the superconducting material 15 to the other side of the yoke 12, so that only the portion of the superconducting material 2 facing the permanent magnet as in the conventional case. The pinning effect can be sufficiently exerted, and the radial rigidity can be increased, as compared with the case where the magnetic flux reaches only.

FIG. 2 is a diagram showing a main part of another embodiment of the present invention. In the example shown in FIG. 2A, the spindle 11 is provided with a pair of flanges 16 and 17 so as to face each other, and the permanent magnets 18 and 19 are disposed to face each of the flanges 16 and 17, respectively. The superconducting material 2 is inserted in the air gap between the points 19 and 19. Even with this structure, the same effect as that of the embodiment of FIG. 1 can be obtained.

In the example shown in FIG. 2B, the housing 14
A ring-shaped yoke 20 is provided on the inner peripheral surface of the
Permanent magnets 21 and 2 so that they face each other inside 0
2 is provided, and the superconducting material 23 is provided on the spindle 11 so as to be inserted into the air gap between the permanent magnets 21 and 22. The embodiment shown in FIG. 2B can also obtain the same effect as the embodiment shown in FIG.

FIG. 3 is a vertical sectional view of an embodiment in which the present invention is applied to a linear motor. In FIG. 3, the rail 31 is formed in a U-shaped cross section, and the permanent magnet 3 is formed on the inner surface facing the rail 31.
2, 32 are arranged opposite to each other so as to have a predetermined air gap. The slider 33 is magnetically levitated on the rail 31, and a superconducting material 34 is provided below the slider 33 so as to interpose an air gap between the permanent magnets 32.

As described above, even if the present invention is applied to the linear motor, the magnetic flux generated in one permanent magnet 32 passes through the superconducting material 34 and reaches the other permanent magnet 32, so that the pinning effect is obtained. Since it can be sufficiently exhibited and the rigidity per unit volume can be increased, the volume of the superconducting material 34 can be reduced.

[0018]

As described above, according to the present invention, the yoke is provided on the inner surface of the spindle or the housing, the permanent magnet 5 is arranged therein, and the superconducting material is inserted into the air gap of the yoke. Since the magnetic flux of the permanent magnet passes through the superconducting material, the pinning effect can be sufficiently exerted, the radial rigidity can be increased, and the volume of the superconducting material can be reduced. Also, the same effect can be obtained by applying the present invention to a linear motor.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a main part of another embodiment of the present invention.

FIG. 3 is a vertical sectional view of an embodiment in which the present invention is applied to a linear motor.

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

5 is a diagram for explaining a state in which the magnetic flux of the upper thrust permanent magnet shown in FIG. 4 passes through the upper superconducting material.

[Explanation of symbols]

 11 Spindle 12,20 Yoke 13,18,19,21,22,32 Permanent magnet 14 Housing 15,23,34 Superconducting material 16,17 Flange 31 Rail 33 Slider

Claims (3)

[Claims] 1. A superconducting magnetic bearing device for magnetically bearing a spindle in a housing by utilizing a pinning effect of a superconducting material, comprising: a yoke portion provided on the spindle, having an air gap; and provided on the yoke portion. A permanent magnet, a superconducting material annularly extending from the inner surface of the housing so as to be inserted into the air gap of the yoke part, and a core for axially moving the spindle before cooling the superconducting material to a critical temperature or lower. A superconducting magnetic bearing device including a projecting member. 2. A superconducting magnetic bearing device for magnetically bearing a spindle in a housing by utilizing a pinning effect of a superconducting material, comprising: a yoke portion provided on the inner surface of the housing and having an air gap; A permanent magnet, a superconducting material that extends annularly from the outer peripheral surface of the spindle so as to be inserted into the air gap of the yoke portion, and to move the spindle in the axial direction before cooling the superconducting material below a critical temperature. Equipped with the centering member of
Superconducting magnetic bearing device. 3. A superconducting magnetic bearing device for floating a slider by utilizing the pinning effect of a superconducting material, comprising: rails each having a U-shaped cross section and provided with permanent magnets on respective facing surfaces; A superconducting magnetic bearing device comprising a superconducting material provided below the slider and interposed in an air gap of the rail.