JP3510455B2 - Magnetic bearing device using second class superconductor - Google Patents

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 for a flywheel system for power storage.

[0002]

[Prior art]

(Explanation of Terms) (1) “Type 2 superconductor” refers to a substance in which a superconducting state and a normal conducting state are mixed under high temperature and high magnetic field. (2) "Pinning" is a general term for a mechanism that prevents the movement of a deformable (elastic) object, that is, a mechanism that causes friction. Especially type 2 superconductors and charge density waves (CDW)
Attention is paid to the state.

In the second type superconductor, the interaction between the pinning center and the magnetic flux line is classified into the following three cases depending on the type of energy involved. (A) When the superconducting condensation energy changes locally, (b) when the elastic energy of the strain field of the pinning center changes due to the magnetic flux lines, (c) when the magnetic flux lines are magnetic. When the energy changes depending on the pinning center, (3) "pinning force" refers to a kind of static friction force acting on the magnetic flux line system due to the pinning center. (4) The "bearing portion" refers to a portion of the bearing device that exhibits performance as a bearing, that is, a portion of the coolant container 4 and a portion of the disc 5 in the bearing device of FIG. (Prior Art) A conventional superconducting magnetic bearing device is shown in FIG.

[0004] Figure 3 is a cross-sectional view in the axial direction of the superconducting magnetic bearing device for supporting the rotary shaft 6 by utilizing the levitation force generated by the "pinning force," of the two superconductor 1, 1 Second type superconductor, 2a and 2b are permanent magnets, 4 is a coolant container containing liquid nitrogen for fixing the second type superconductor, 5 is a disk attached to the rotating shaft 6, and 7a and 7b are Coolant container 4
Reference numeral 8 denotes a pipe through which a coolant flows, and 8 is a housing in which a magnetic bearing device is incorporated.

The device shown in FIG. 3 is a superconducting magnetic bearing device using a magnetic levitation mechanism by the "pinning force" of the second-type superconductor 1 at a temperature higher than the temperature of liquid nitrogen, and the rotating shaft 6 Is the permanent magnet 2 attached to the disk 5 attached to the rotating shaft
a, occurs between the 2b, circulatory tube 7a, the second type superconductor 1 that is stored in the cooling Zaiyo device 4 in the housing to circulate a coolant, such as by Ri liquids nitrogen 7b " Levitate using the magnetic force generated by the "pinning force".

[0006]

However, the conventional techniques have the following problems. FIG. 4 shows a type 2 superconductor 1.
A permanent magnet 2a, a magnetic force per unit area acting between the 2b (hereinafter referred to as a first magnetic repulsive force), and, second type permanent magnet 2a in place of the superconductor 1, the same and 2b magnetic force per unit area acting upon the magnetic poles provided that permanent Hisa磁stone to opposite (hereinafter referred to as a second magnetic repulsive force) shows.

As shown in FIG. 4, the first magnetic repulsive force is
Compared with the second magnetic repulsive force, it shows a steep rise with respect to the gap. Then, the first magnetic repulsion force and the second magnetic repulsion
The magnitude of the force varies inversely with the size of the gap.
It If the gap is the same, the second magnetic repulsion force is the first magnetic repulsion force.
Greater than repulsive force. For this reason, the first magnetic repulsive force,
In the case of the same gap , only a small levitation force is obtained as compared with the second magnetic repulsive force. An object of the present invention is to provide a magnetic bearing device that can solve these problems.

[0008]

SUMMARY OF THE INVENTION A magnetic bearing device according to the present invention is arranged circumferentially in a coolant container below a disc mounted so as to be orthogonal to a rotation axis, circumferentially and alternately. comprising the a plurality of second type superconductor and a plurality of first permanent magnets, the ring-shaped second permanent magnet mounted to the first permanent magnet and the magnetic pole is opposed to the disc. Alternatively, the magnetic bearing device according to the present invention includes a second-type superconductor, a first permanent magnet, a second permanent magnet, a coolant container, a disc mounted so as to be orthogonal to the rotation axis, and a housing. The second-type superconductor is stored in a coolant container in a housing in which a coolant is circulated by a pipe, a second permanent magnet is attached to a disc, and a first permanent magnet is a second permanent magnet. Same as magnet
The magnetic poles are attached to the coolant container so as to face each other, and the rotating shaft has a first magnetic repulsive force generated between the second permanent magnet and the second type superconductor, a second permanent magnet and a first permanent magnet. by a second magnetic repulsive force acting between the, float, have balanced and the weight and magnetic repulsive force of the rotating shaft than the second magnetic repulsive force toward the first magnetic repulsive force increases To be the first
The upper surface of the permanent magnet is arranged below the upper surface of the second type superconductor.

Therefore, it operates as follows. A first magnetic repulsive force acting between the second type superconductor and a first permanent magnet, the combined second magnetic repulsive force acting between the second permanent magnet and the first permanent magnet A magnetic repulsive force can be obtained.

[0010] However, the magnetic repulsion between each other permanent magnets increases, the unstable to the radial direction, the adjustment mechanism attached to the first permanent magnet, acting between the second permanent magnet A type 2 superconductor that balances magnetic repulsion
Increasing the radial stability by holding force in the radial direction acting between the second permanent magnet.

[0011] By the second type superconductor and than the distance between the second permanent magnet sizes and spacing between the first permanent magnet and the second permanent magnet <br/> Kusuru, the first permanent magnet than that of the second magnetic repulsive force acting between the second permanent magnet and the two superconductors second
The first magnetic repulsive force acting between the permanent magnet and the permanent magnet can be increased.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention is shown in FIGS. 1, 2 and 5. Figure 1 is a Ru axial sectional view der superconducting magnetic bearing device according to this embodiment. In Figure 1
There are, 1a, 1b is the second type superconductors, 2a, 2b is second
Permanent magnets, 3a to 3d are first permanent magnets, 4 is a coolant container containing liquid nitrogen or the like for fixing the second-type superconductors 1a and 1b , 5 is a disk attached to the rotating shaft 6, 7a , Reference numeral 7b denotes a pipe for flowing the coolant to the coolant container 4, and 8 denotes a housing in which a magnetic bearing device is incorporated.

[0013] Figure 2 is a top view of the engagement Ru superconducting magnetic bearing device according to an embodiment, in FIG. 2, 1a-1i
Is a type II superconductor circumferentially arranged in the coolant container 4 , 2a and 2b are second ring-shaped permanent magnets attached to the disc 5, and 3a to 3s are inside the coolant container 4. It shows a first permanent magnet mounted circumferentially.

As shown in FIG. 2, the second-type superconductivityBody 1a ~
1i is, Ring-shapedSecond permanent magnet 2a and second permanent magnet 2
bEvenly spaced on the circumference of the middle of the diameter. Well
First permanent magnetThreea-3s is, Type II superconductors1a ~
1i andSecond permanent magnetStone 2a, 2b andThe same surface as the overlapping area
So that the products overlapIt

[0015] As shown in FIGS. 1-2, the rotating shaft 6 is attached to the disc 5, the second permanent magnets 2a, 2b are also attached to the disc 5. Second type superconductor 1 a to 1 i
It is stored in the pipe 7a, 7 b of the circulatory system depending on the coolant container 4 in the housing 8 for circulating coolant such liquid nitrogen. First permanent magnet 3a~3s, the second permanent magnet
2 a, 2 b and the pole is attached to <br/> in the coolant vessel 4 so as to face each other. Rotating shaft 6, and the second permanent magnet 2 a, 2 b attached to the disk 5, the coolant in the housing 8
The “pinning force”, that is, the first magnetic repulsion force generated between the second-type superconductors 1 a to 1 i stored in the container 4 , and the second
It cooled such permanent magnet 2 a, 2 b and the pole faces Zaiyo
It is levitated by the second magnetic repulsive force acting between the first permanent magnets 3a to 3s attached to the container 4 .

FIG. 5 is a diagram showing that the dynamic rigidity can be lowered by setting different gaps in the first embodiment. "Dynamic rigidity" is not the static spring constant of the bearing (repulsive force per unit length generated when pushed slowly), but the repulsion per unit length generated when a dynamic change is given. Say power.

[0017]

Since the present invention is constructed as described above, it has the following effects. According to the present invention
According to the magnetic bearing device, the <br/> other second type superconductor in coolant container, a first permanent magnet arranged circumferentially, <br/> same pole as the first permanent magnet The ring-shaped second attached to the disk so that they face each other.
By arranging the permanent magnet, and a second type superconductors second
A first magnetic repulsive force acting between the permanent magnet, a second permanent magnet
If it is possible to obtain a floating force of the combined second magnetic repulsive force acting between the first permanent magnet. Further, the center of the first permanent magnet farther to the rotation axis on the outside of the distant second permanent magnet by Ri径direction to the rotation axis and the rotation axis of the first center of permanent magnet close to the rotational axis
By installing the inner side of the second permanent magnet by Ri径direction close to, if the rotation axis is displaced in the radial direction, it is possible to increase the rigidity in the radial direction.

[0018]

[0019]FirstPermanent magnetOn stoneMagnetic field generated by the second permanent
PorcelainOn stoneArises fromWork together by a magnetic fieldRadial repulsion
Adjusting mechanism to balance the powerFirst permanent magnetInstall
By doingSecond permanent magnetAnd type 2 superconductivityof a bodyWorking in between
Magnetic force that enables stable magnetic levitation due to the holding force in the radial direction
It can be a bearing device.ChangeThe first permanent magnetStone and
Second permanent magnetStone andGapToSecond permanent magnetStone andType 2 superconductivity
Body andBy setting a little more than the gap of
At the position of the gap where the levitation force that balances the amount is obtained, the first magnetic
Repulsive force (second permanent magnet)Stone andType 2 superconductivityBody andWork between
The magnetic repulsion force is the second magnetic repulsion force (the first permanent magnet).stone
WhenSecond permanent magnetStone andMagnetic repulsion that acts between)
Therefore, a stable magnetic bearing device can be obtained.Well
In the case of magnetic bearings, the vibration of the rotating system generates an alternating magnetic field.
However, since the magnetic repulsion force is attenuated by the magnetic flux flow,
The energy loss increases with theShown in 5
So thatBetween the first and second permanent magnets beforehand
By setting the gap offset to
As shown in, rigidity can be reduced and energy loss can be suppressed.
Rukoto can.

[Brief description of drawings]

FIG. 1 is an axial sectional view showing a superconducting magnetic bearing device according to a first embodiment of the invention.

FIG. 2 is a second-type superconductor of the superconducting magnetic bearing device of FIG .
FIG. 3 is a plan view showing the arrangement of the first permanent magnet and the second permanent magnet .

FIG. 3 is an axial sectional view showing a conventional superconducting magnetic bearing device.

FIG. 4 is a gap between a permanent magnet and a type 2 superconductor and a permanent magnet.
If the gap between stones is the same, the first magnetic repulsive force
FIG . 5 is a diagram showing the relationship between the second magnetic repulsive force and the gap .

FIG. 5 is more permanent than the gap between the permanent magnet and the type 2 superconductor.
The first magnetic repulsive force when the gap between the magnets is widened.
FIG. 6 is a diagram showing the relationship between the second magnetic repulsive force and the gap.

[Explanation of Codes ] 1a to 1i ... Second-type superconductors 2a and 2b ... Second permanent magnets 3a to 3s ... First permanent magnet 4 ... Coolant container 5 ... Disk 6 ... Rotating shafts 7a, 7b ... Tube 8 …housing

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masaharu Minami, 2-1-1 Shinhama, Arai-cho, Takasago-shi, Hyogo Prefecture Mitsubishi Heavy Industries, Ltd. Takasago Research Laboratory (72) Seiichi Kawanami 2-chome, Niihama, Arai-cho, Takasago-shi, Hyogo No. 1 Mitsubishi Heavy Industries, Ltd., Takasago Research Laboratory (72) Inventor, Yutaka Kawashima 2-1-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Mitsubishi Heavy Industries, Ltd., Takasago Works (56) Reference JP-A-9-166142 (JP, A) JP-A-8-219158 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16C 32/00-32/06

Claims (8)

(57) [Claims] 1. A plurality of second-type superconductors circumferentially and alternately arranged in a coolant container below a disc mounted so as to be orthogonal to a rotation axis in a circumferential direction. and a magnetic bearing device comprising a plurality of first permanent magnets, said the disk first permanent magnet and the magnetic poles and a ring-shaped second permanent magnet mounted so as to face. 2. A second-type superconductor, a first permanent magnet, a second permanent magnet, a coolant container, a disc mounted so as to be orthogonal to a rotation axis, and a housing. The second-class superconductor is stored in a coolant container inside a housing in which a coolant is circulated by a pipe, the second permanent magnet is attached to the disc, and the first permanent magnet is the second permanent magnet. Is attached to the coolant container so that the same magnetic poles face each other, and the rotating shaft has a first magnetic repulsive force generated between the second permanent magnet and the second type superconductor; The second magnetic repulsive force acting between the permanent magnet and the first permanent magnet levitates , and the weight of the rotating shaft and the magnetic repulsive force are balanced,
The first magnetic repulsive force is more preferable than the second magnetic repulsive force.
The upper surface of the first permanent magnet to the second
A magnetic bearing device characterized by being arranged below the upper surface of a seed superconductor . 3. A disc mounted so as to be orthogonal to the axis of rotation.
A plurality of second circumferentially arranged cooling medium containers below the
A seed superconductor and a first superconductor mounted so as to be circumferentially arranged in the cooling container.
1 permanent magnet, so that the same magnetic pole as the first permanent magnet faces the disk
An attached ring-shaped second permanent magnet, wherein the plurality of second-type superconductors surround the rotation shaft and are evenly spaced.
Spaced apart from each other, and the first permanent magnets are not paired between the second type superconductors.
A magnetic bearing device characterized in that they are provided apart from each other . 4. A disc mounted so as to be orthogonal to the rotation axis.
A plurality of second circumferentially arranged cooling medium containers below the
A seed superconductor and a first superconductor mounted so as to be circumferentially arranged in the cooling container.
1 permanent magnet, so that the same magnetic pole as the first permanent magnet faces the disk
An attached ring-shaped second permanent magnet, wherein the second permanent magnets having different diameters surround the rotating shaft,
And the plurality of second-type superconductors are arranged apart from each other, and the plurality of second-type superconductors are the second permanent magnets.
No. 1 pair of the first permanent magnets are arranged at equal intervals along the circumference of the middle of the joint, and between the second type superconductors.
And the center of the first permanent magnet close to the rotating shaft
Installed on the inner side in the radial direction from the second permanent magnet close to
The center of the first permanent magnet far from the axis of rotation is the second far from the axis of rotation.
A magnetic bearing device that is installed on the outer side of the permanent magnet in the radial direction . 5. The plurality of second-type superconductors are arranged at equal intervals surrounding the rotating shaft, and the first permanent magnets are separated by one pair between each of the second-type superconductors. The magnetic bearing device according to claim 1, wherein the magnetic bearing device is provided. 6. any one of claims 1, 3 and 5 in which two of said second permanent magnets having different diameters surrounding the rotary shaft, and characterized in that it is spaced apart from each other The magnetic bearing device described in <br />. 7. The two second permanent magnets having different diameters are arranged so as to surround the rotation shaft and apart from each other, and the plurality of second type superconductors have a diameter of the two second permanent magnets. Of the first permanent magnets, which are arranged at equal intervals on the circumference of the middle of the first permanent magnet, are separated from each other by a pair between the second type superconductors, and the center of the first permanent magnets is close to the rotation axis. Is installed radially inward of the second permanent magnet close to the rotary shaft, and the center of the first permanent magnet remote from the rotary shaft is located farther from the rotary shaft.
The magnetic bearing device according to claim 1, wherein the magnetic bearing device is installed radially outside the permanent magnet. 8. The N of the first permanent magnet near the rotation axis
The pole and the N pole of the second permanent magnet near the rotation axis face each other,
請 wherein said S pole farther to the rotation axis the first permanent magnet and the S pole of the distant second permanent magnets in said rotary shaft is opposed
The magnetic bearing device according to claim 4 or claim 7.