JPH10325415A - Magnet part reinforcing structure of superconduction magnetic bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the magnet part reinforcing structure of a superconduction magnetic bearing device to improve a compression force exerted on a magnet part on the inner peripheral side. SOLUTION: In a magnet part reinforcing structure, a magnet part mounted on the rotary body part B of a superconduction magnetic bearing device is provided with annular permanent magnetic 10 and 10 concentric to the axis of a rotary body part and a reinforcing member 5 to radially and peripherally compress the annular permanent magnet is mounted on the outer peripheral side of the annular permanent magnet. The reinforcing member 5A is an annular member made of carbon fiber-contained reinforced plastic(CFRP), and the reinforcing member 5A is the magnetic part reinforcing structure of a magnetic bearing device having fibers in a peripheral direction and fibers in a radial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet reinforcing structure for a superconducting magnetic bearing device using a superconductor, and more particularly to, for example, a centrifuge, various fluid machines, and machine tools requiring an ultra-high-speed rotation operation. It is most suitable for an electric power storage device or the like that converts surplus electric power into rotational energy of a flywheel and stores it.

[0002]

2. Description of the Related Art Using a superconducting phenomenon, a rotating body (hereinafter referred to as a rotating body)
Used to include the rotation axis. The superconducting magnetic bearing device, which is capable of high-speed and high-speed rotation by pivotally supporting the non-contact state, has a superconductor part mounted on the fixed body part and a permanent magnet fixed to the rotating body part. With a magnet part,
For the fixed superconductor part, the magnet part of the rotating body part is
It is configured to be magnetically levitated so as to face each other at a predetermined interval, and is provided so that the magnet unit rotates together with the rotator when the rotator rotates.

The permanent magnet of this magnet portion is Pr-F
Permanent magnets manufactured by an e-B-Cu hot working method and sintered Nd-Fe-B magnets are generally used. However, the former tensile strength is 24 kg / m
It is known that the upper limit is m ² and the tensile strength of the latter is 8 kg / mm ² , and the tensile strength of the magnet is relatively low. On the other hand, the compressive strength of these magnets is about 10
0 kg / mm ² , which is known to be extremely high.

Therefore, in order to avoid the rotational destruction of the magnet part during the rotation operation, it is necessary to keep the tensile force generated in the magnet by the rotational centrifugal force within this tensile strength, and as a result, the number of rotations is restricted. .

[0005] The inventors of the present invention have previously applied a compressive stress to the magnet portion in a direction opposite to the direction of action of the centrifugal force to improve the apparent tensile strength, thereby achieving high-speed rotation. (Japanese Patent Application Nos. 7-29490 and 7-5620).
No. 8, No. 7-74066, No. 7-81446).

That is, as described above, the magnet fixed to the rotating body has a relatively low tensile strength, but has an extremely high compressive strength of about 100 kg / mm ² . Therefore,
The present inventors have paid attention to this point, and based on applying a compressive force to the magnet in advance, not only applying the compressive force but also the applied compressive force by centrifugal force at the time of rotation A configuration (apparatus and method) that can prevent the reduction as much as possible has been proposed.

The reinforcing member for supplying the compressive force is a ring-shaped hoop mounted on the outer periphery of the magnet portion. The hoop has a specific gravity as small as possible than that of the permanent magnet, and a rotation generated by itself during rotation. It is made of a material that is less affected by the centrifugal force and has a large tensile breaking strength.
Further, the respective compressive forces of the hoop in the radial direction and the circumferential direction of the permanent magnet are set to appropriate values smaller than the compressive fracture stress of the magnet when the rotating body is stopped. That is, it is desirable that the optimal stress state be such that when the rotation is stopped, the magnet of the magnet part is compressed to the limit compressive strength by the hoop, and the hoop itself is given a tensile stress that allows a margin. In other words, the margin of the stress of this hoop must be larger than the sum of the tensile stress due to the centrifugal force acting on the hoop itself and the tensile stress from the magnet at the rotation speed at which the magnet is destroyed by the centrifugal force during the rotation operation. No.

As described above, in the above-mentioned proposal, at least the magnet section of the rotating body section includes an annular permanent magnet having the axis of the rotating body section concentric, and is provided on the outer peripheral side of the annular permanent magnet. An apparatus and method having a configuration in which a ring-shaped hoop that compresses the annular permanent magnet in the radial direction and the circumferential direction is provided.The apparatus and method can cope with high-speed rotation, and even if the outer shape of the permanent magnet is increased, Since the mechanical strength of the magnet can be improved, the size of the magnet can be increased, and a superconducting magnetic bearing device having a large loading force can be obtained.

As the hoop member, a carbon fiber-reinforced plastic (CFRP) having a lower specific gravity and a higher tensile strength than a magnet is used. CFRP is a high-strength anisotropic material, made by a filament winding method, machined to precise dimensions and turned into a hoop.

[0010] Furthermore, there has been proposed a structure in which such hoop members are multiplexed to reduce the applied compressive force shared by each hoop and to facilitate the work of attaching the hoop to the magnet portion.

[0011]

However, in a structure in which hoops are multiplexed, the hoop member itself made of CFRP has low resistance to stress in the radial direction. The disadvantage is that the compressive force supplied to the part is restricted.

That is, the innermost hoop of the multiple hoop receives a total of the compressive forces supplied from the outer hoop, and the radial compressive stress tends to increase.

In view of the above, it is considered that in a magnet part reinforcing structure equipped with a reinforcing member for compressing the annular permanent magnet in the radial direction and the circumferential direction, if the stress resistance in the radial direction is improved, the reinforcing performance may be further enhanced. The present invention has been completed.

That is, according to the present invention, as the ring-shaped reinforcing member mounted on the outer periphery of the magnet portion, in addition to the circumferential carbon fibers, a high stress-resistant member having radial carbon fibers is used. It is an object of the present invention to provide a magnet portion reinforcing structure of a superconducting magnetic bearing device capable of improving a compressive force applied to a magnet portion on the inner peripheral side.

[0015]

According to the first aspect of the present invention, there is provided a ring-shaped permanent magnet having a magnet portion mounted on a rotating body portion of a superconducting magnetic bearing device and having an axial center of the rotating body portion concentric. Wherein a reinforcing member for compressing the annular permanent magnet in the radial and circumferential directions is mounted on an outer peripheral side of the annular permanent magnet, wherein the reinforcing member is made of carbon fiber-reinforced plastic (CFRP). The carbon fiber is a magnet part reinforcing structure of a superconducting magnetic bearing device having a configuration in which the carbon fiber includes a circumferential fiber and a radial fiber.

According to a second aspect of the present invention, in the first aspect of the present invention, the ring-shaped reinforcing members are provided in a multiplex manner, and at least the innermost circumferential reinforcing member is provided in the circumferential direction. Of the superconducting magnetic bearing device having a configuration in which the carbon fibers and the radial carbon fibers are provided.

According to a third aspect of the present invention, in the first aspect of the present invention, the reinforcing member is formed by laminating a plurality of arc-shaped cloths woven by vertically and horizontally intersecting carbon fibers. This is a structure for reinforcing a magnet portion of a superconducting magnetic bearing device having the following configuration.

According to a fourth aspect of the present invention, in the first aspect of the invention, the reinforcing member comprises a plurality of disk-shaped woven fabrics in which fibers are woven in a radial direction and a circumferential direction. This is a structure for reinforcing a magnet part of a superconducting magnetic bearing device having a configuration formed as follows.

According to a fifth aspect of the present invention, in the first aspect of the invention, the reinforcing member has an elastic modulus (ED) in a circumferential direction of 10,000 to 25,000 [Kg
/ Mm ² ], and the elastic modulus (Er) in the radial direction is 2,000 to
The superconducting magnetic bearing device has a structure of 6,000 [Kg / mm ² ].

According to a sixth aspect of the present invention, there is provided a superconducting magnetic bearing device according to the second aspect of the present invention, wherein an intermediate ring member made of a titanium alloy is interposed between multiple reinforcing members. It is a magnet part reinforcement structure.

As described above, in the magnet part reinforcing structure equipped with the reinforcing member for compressing the annular permanent magnet in the radial direction and the circumferential direction, by disposing the hoop in which the circumferential and radial carbon fibers are arranged, As compared with the case where only carbon fibers are wound around the normal hoop, the stress resistance in the radial direction is improved, and the reinforcing performance is further enhanced.
In particular, when the innermost reinforcing member is provided with the circumferential carbon fibers and the radial carbon fibers, the stress resistance in the radial direction can be further improved. Further, the reinforcing member is formed by laminating a plurality of arc-shaped cloths woven by intersecting carbon fibers vertically and horizontally, or a disk-shaped woven cloth woven by arranging the fibers in the radial direction and the circumferential direction. Can be easily implemented by forming a plurality of layers. Further, the reinforcing member has a circumferential elastic modulus (ED) of 10,000 to 25,000 [Kg
/ Mm ² ], and the elastic modulus (Er) in the radial direction is 2,000 to
When it is 6,000 [Kg / mm ² ], high-speed rotation becomes possible. In this case, change the distribution ratio between the warp and the weft,
By combining fibers having different Young's moduli, desired properties can be adjusted and obtained. Also,
When an intermediate ring member made of a titanium alloy is interposed between the multiple reinforcing members, good assemblability and uniformity of compressive force transmission can be ensured. Furthermore, since the specific gravity of titanium itself is small, the adverse effect (increase in stress) due to the centrifugal force during high-speed rotation can be reduced.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to FIGS.
A description will be given based on the specific example shown in FIG.

FIG. 1 is a partially broken perspective view showing a superconducting magnetic bearing device using the magnet portion reinforcing structure of the present embodiment, and illustrating a schematic configuration of a main part of the superconducting magnetic bearing device. This superconducting magnetic bearing device is composed of a fixed body part A with a superconductor part mounted thereon and a rotating body part B with a magnet part 1 mounted thereon. This is a superconducting bearing device of a type in which a rotating body portion B provided with a magnet portion 1 faces each other at intervals and is rotatably disposed.

The superconductor portion has a conventionally known structure and is housed in a cooling case (not shown). An annular support made of copper or another metal material is fixed to the outer diameter side of the cooling case, and a superconductor is buried annularly inside the support. In this cooling case, a refrigerant is circulated and circulated.
The inside of the cooling case is maintained at a predetermined low temperature at which the superconductor can maintain the superconducting state.

This superconductor is formed by uniformly mixing normal conducting particles Y ₂ Ba ₁ Cu ₁ inside a substrate made of an yttrium-based high-temperature superconductor, for example, YBa ₂ Cu ₃ O _x. It has the property of restricting the intrusion path of the magnetic flux generated by the magnet part 1 due to the flowing superconductive current.

Further, the superconductor portion is disposed facing the magnet portion 1 at a predetermined distance in the axial direction. That is, the separation distance between the two is set to a distance at which the magnetic flux generated from the magnet portion 1 can enter the superconductor by a predetermined amount, and at the same time, even if the rotating body portion B rotates, the distribution state of the entered magnetic flux does not change. Is provided.

The rotating part B is mainly composed of a magnet part 1, and the magnet part 1 has a fitting part fitted to the shaft end of a shaft (not shown), And a hoop 5 fixed to the outer periphery of the magnet ring body 2 to compress and reinforce the magnet ring body 2.
(5A, 5B).

The hub 4 is formed of an aluminum material into a disk shape having a predetermined outer diameter, and a fitting portion having a predetermined inner diameter is provided at the center thereof. Although not shown, the hub 4 is provided with twelve screw holes at radially equal intervals, and a bolt or the like is attached to any of the screw holes so that the hub 4 can rotate during actual rotation operation. The rotation balance of the body A can be adjusted.

The magnet ring body 2 has four annular permanent magnets 10 and 10 which are concentric with the axis of the rotating body part B and whose adjacent magnets repel each other in the radial direction. An annular soft magnetic yoke 4a is provided inside the peripheral annular permanent magnet 10, between the annular permanent magnets 10, and between the annular outer permanent magnets 10, and outside the outermost annular permanent magnet 10. The magnetic circuit formed by the permanent magnet 10 is axially symmetric.

The configuration of the magnet ring body 2 is such that the ring magnets repelled and magnetized in the radial direction are multiplexed via a magnetically permeable yoke or formed by a single magnet. However, in each of the specific examples described later, the configuration is basically the same, and thus the description will be omitted.

In this embodiment, a permanent magnet manufactured by, for example, a Pr—Fe—B—Cu hot working method is used as the annular permanent magnet 10, and the annular soft magnetic yoke 4 a Is formed using soft iron such as pure iron.

Accordingly, in such a structure, the magnetic flux from the N poles of the two annular permanent magnets 10, 10 passes through the annular soft magnetic yoke 4a, and the magnetic fluxes of the respective annular permanent magnets 10, 10 are formed. Returning to the S pole, the magnetic flux generated by each of the annular permanent magnets 10, 10 is constricted and concentrated by the annular soft magnetic yoke 4a, so that the magnetic flux density reaching the superconductor portion is greatly increased. can do.

During the operation of the superconducting magnetic bearing device, the superconducting portion is cooled by the refrigerant circulating in the cooling case, and is maintained in a superconducting state. In this superconducting state, the magnetic flux from the annular permanent magnet 10 of the rotating body portion B penetrates so as to selectively pass the normal conducting particles uniformly mixed in the superconductor, and the superconducting current flows around the penetrated magnetic flux. Flows, the entry path of the magnetic flux is fixed at a constant level. Accordingly, the rotating body portion B, together with the annular permanent magnet 10, is in a state (pinning phenomenon) as if it were restrained by a superconductor via a magnetic flux. However, since the movement of the magnet in the direction in which the magnetic flux density does not change is not restricted by the superconductor, the annular permanent magnet 10 constituted by the axially symmetric magnetic circuit rotates smoothly without being restricted in the rotational direction. Can be.

The hoop 5 is formed of carbon fiber reinforced plastic (CFRP), is mounted on the outside of the magnet ring 2 and compresses and reinforces the magnet ring 2. By supplying a compressive force to the inner magnet unit 1 from above, the tensile destruction due to the centrifugal force of the magnet unit 1 is suppressed as much as possible, and a high rotation operation of the rotating body A is enabled.

As described above, since each hoop 5 is formed using carbon fiber reinforced plastic (CFRP),
Compared to the case of using only one wide CFRP, a higher compressive force is supplied to the inner magnet ring body 2 and the stress of each hoop can be flattened to the same extent, and the rotation performance can be further improved. So that it can be improved. That is, for example, 3
When a heavy hoop is attached to the magnet part, it can be predicted by calculation or the like that a radial compressive stress exceeding −20 Kg / mm ² is generated in the innermost hoop, as shown in FIG.

Further, in this specific example, the hoop 5
Is a multi-layer structure of hoops formed in a ring shape, and as described later in detail, the innermost hoop is a fabric hoop 5A.

The normal hoop 5B is shown in FIG.
As shown in (2), an anisotropic material CFRP in which carbon fibers are wound in a circumferential direction and fixed with a resin is used. This CFRP has a low strength against a force in the transverse direction with respect to the fiber direction, and the stress resistance limit of the hoop 5B is only about 20 kg / mm ² . Therefore, the compression force supplied from the outer hoop is restricted in order to stay within this limit, and the compression force that can be supplied to the magnet part on the inner peripheral side as a whole of the hoop 5 is similarly restricted. Become.

Then, the innermost hoop is replaced with the woven hoop 5
A, the compressive stress resistance performance in the radial direction is
It is improved to about 25 to 30 Kg / mm ² so that the above-mentioned restriction can be eliminated.

The material properties of carbon fiber-reinforced plastic (CFRP), which is an axisymmetric orthotropic material used for each hoop, and carbon fiber-reinforced plastic fabric (CFRP fabric) are shown below. .

[0040]

[Table 1]

The Pr magnet of this embodiment has a density [g / g
cm ³ ] is 7.4, Poisson's ratio is 0.24, and Young's modulus (E [× 10 ¹¹ Pa]) is 1.34.

Further, the woven fabric hoop 5A using the woven fabric CFRP used as the innermost hoop of this embodiment is shown in FIG.
As shown in (1) and (2), it is formed in an outer shape similar to a conventional hoop, and provided in a configuration in which carbon fibers are distributed in a predetermined manner in a circumferential direction and a radial direction.

That is, it is manufactured using each process procedure and each jig described below.

First, as shown in FIG. 5, a dedicated CFRP loom (not shown) is used. Inside the CFRP loom, carbon fibers have a constant radius of curvature and a carbon The fibers are woven in a belt shape having a predetermined width and height in which fibers are distributed, and are discharged as a raw material 5C from a discharge port of a CFRP loom. Then, the raw material 5 discharged in a spiral shape
C is automatically wound up, stacked, and fixed with a resin in the same manner as in the related art.

Further, in this example, if the thickness of the raw material is increased, there is a problem that the filling of the plastic becomes difficult.
A base material having a thickness (5D in FIG. 6A) is manufactured.
That is, first, the surfaces to be bonded to each other are hand-blasted to make a uniform flat surface, then each surface is coated with an adhesive and bonded by pressure, and finally left naturally to complete Let me.

Further, as shown in FIG. 6 (1), the fiber density in the radial direction is high, and
Cut out and used as hoop 5A.

That is, the inner diameter of the base material 5D is previously set slightly smaller than the inner diameter of the hoop 5A to be manufactured, while its outer diameter is a predetermined width smaller than the outer diameter of the hoop 5A. It is set large.

Then, since the inner peripheral portion of the base material 5D is cut out to form the hoop 5A, the radial fiber density per unit volume becomes sufficiently high as shown in FIG. The performance can be improved.

Further, as shown in FIGS. 7A and 7B,
It is also preferable that a plurality of disk fabrics 5a, 5a are laminated on the fabric hoop 5A used as the innermost hoop. The disc woven fabric 5a is a disc-shaped woven fabric in which fibers are arranged in a radial direction and a circumferential direction and woven. When a large stress is generated in the radial direction and the circumferential direction, the fibers in the radial direction and the circumferential direction are used. Can respond. Moreover, since the fabric hoop 5A of this example is formed by laminating a plurality of disc fabrics 5a, 5a, the moldability of the hoop itself is easy, and furthermore, each disc-shaped layer is a complete independent one. By laminating a plurality of these, it is possible to obtain a hoop excellent in stress resistance having no cut end on the end face.

An intermediate ring member 3 is interposed between the hoop 5A and the magnet ring 2 and between the hoops 5A and 5B. By using a titanium alloy having a high specific gravity, good assemblability and uniformity of compressive force transmission can be ensured, and adverse effects of centrifugal force can be reduced.

That is, first, at the time of assembling, the hoop is slid and assembled, so that it is necessary to prevent damage to the hoop and the intermediate ring member 3 itself. The surface must be able to be processed smoothly so that it can be in close contact. Also, after assembling, the Young's modulus is small so that the compressive force by the hoop can be sufficiently transmitted to the inner magnet part.
At the time of the rotation operation, the specific gravity needs to be small so as not to adversely affect the increase in stress due to the rotational centrifugal force due to its own weight. Further, it is important that the material can withstand high stress, exhibit elastic characteristics without plastic deformation within the allowable stress range, and have a small variation in stress state.

Under these conditions, the iron-based material has a large specific gravity, and the aluminum-based material has an insufficient hardness. On the other hand, the Young's modulus and the specific gravity of these materials are as high as that of iron at a high strength. About half of titanium materials are promising, for example, 6
Preference is given to titanium alloys of vanadium, 4 aluminum composition.

Although this titanium alloy is known as a very difficult-to-cut material, first, a rough shape is formed by die forging, and then a sufficiently practical material is obtained by grinding. It has been confirmed that it can be manufactured to the required dimensions and shapes.

Accordingly, the intermediate ring member 3 using such a titanium alloy makes the compression force supplied to the magnet ring 2 from the multiple hoops 5A and 5B mounted on the outer peripheral side of the magnet portion uniform. I have to.

Then, such multiple hoops 5A and 5B
Is formed by reducing the inner diameter of the hoop 5 in advance to a predetermined shape based on the outer diameter of the magnet ring body 2, and expanding the hoop 5 by the difference between these diameters, that is, the closing margin, and 2 to supply a predetermined compressive force to the inner magnet ring body 2.
As shown in FIG. 8, an assembling jig 11 previously proposed by the inventors or the like is used.

That is, the assembling jig 11 is mounted concentrically with the magnet ring 2 constituting the magnet portion 1 of the superconducting magnetic bearing device, and is concentrically mounted on the magnet ring 2. A guide jig 13 having a predetermined outer shape, and a pressing jig 14 for pressing the hoop 5 through the intermediate hoop 41 in the mounting direction and moving it.

Then, the magnet portion 2 of the superconducting magnetic bearing device is set between the base jig 12 and the guide jig 13, and the CFRP ring-shaped hoop 5 is formed into a cylindrical shape together with the boosting intermediate hoop 41. Using the pressing jig 14, the guide jig 13 is pushed in from above and the hoop 5 is expanded by a predetermined tightening margin without damaging the hoop 5 by the guide jig 13, and the hoop 5 is moved around the outer periphery of the magnet ring 2. And the magnet ring 2 of the superconducting magnetic bearing device can be manufactured.

As described above, according to this example,
In the magnet part reinforcing structure equipped with a reinforcing member that compresses the annular permanent magnet in the radial direction and the circumferential direction, the inner circumferential side is closer to the inner circumferential side than in the case of only a normal hoop in which carbon fibers are wound in the circumferential direction. By disposing the hoop in which the carbon fibers are arranged in the radial direction, the stress resistance in the radial direction is improved, and the reinforcing performance is further enhanced. Therefore, this embodiment is particularly suitable for a superconducting magnetic bearing device used in a power storage device that rotates a heavy flywheel at a high speed and stores power using the rotational energy.

Further, in the present embodiment, the total compression force supplied from each multiplex hoop is smaller than the predetermined amount of compression force supplied from each multiplex hoop, as compared with the case where a plurality of hoops are mounted and a single hoop supplies a predetermined compression force. Therefore, the compression force shared by each hoop, that is, the interference of each hoop can be reduced. Therefore, since the interference of each multiple hoop can be reduced in this way, the inclination angle of the diameter-enlarged guide surface of the guide jig corresponding to each hoop can be reduced to reduce the shear breakage of the hoop or to reduce the overall height. The size can be reduced by reducing the size, and the jig can be easily manufactured.

Further, by multiplexing the hoops, the stress distribution of each hoop is made uniform, and by equalizing and flattening the stress distribution of the hoops, it is possible to effectively reinforce with a minimum amount of reinforcing material, and to break down. A difficult structure can be provided, which can improve the safety and reliability of the device.

Although a specific example using a Pr-Fe-B-Cu magnet as a magnet has been described, the present invention is not limited to this, and other magnets such as ferrite, alnico, neodymium, and samarium may be used. Of course, all permanent magnets can be used. Further, as the superconductor, any superconductor such as a (RE-Ba-Cu-O) -based superconductor including a rare-earth element can be applied, including the yttrium high-temperature superconductor. Here, RE is Y, Sm, E
represents one or more elements selected from the group consisting of u, Gd, Dy, Ho, Er, and Yb.

Further, in the specific example, the circumferential winding compression force by the hoop is 100 kg when the rotating body B is not rotating.
/ Mm ² or less, but the present invention is not limited to this, and applies a compressive force that does not exceed the critical stress of compressive failure of the magnet used. As a hoop of the magnet, besides CFRP, for example, glass fiber reinforced plastic (GFRP) is used.
A material having a specific gravity lower than that of a magnet and having a large critical strength for tensile fracture can be appropriately used.

[0063]

As described above, the present invention provides a superconducting magnetic bearing device in which a magnet mounted on a rotor is provided with a ring-shaped permanent magnet whose axis is concentric with the rotor. In a magnet part reinforcing structure in which a reinforcing member that compresses the annular permanent magnet in a radial direction and a circumferential direction is mounted on an outer peripheral side of the permanent magnet, the reinforcing member is a ring-shaped carbon fiber-reinforced plastic (CFRP). A carbon fiber, wherein the carbon fiber is a magnet part reinforcing structure of a superconducting magnetic bearing device having a configuration in which a circumferential fiber and a radial fiber are provided, and the carbon fiber in the circumferential direction and the radial direction are arranged. When a hoop formed by laminating a plurality of layers and a hoop formed by laminating a plurality of disk-shaped fabrics woven in a radial direction and a circumferential direction are arranged, the carbon fibers are wound in the circumferential direction. Compared to a normal hoop only It can be improved stress of radial, enhancing further reinforcing performance.

As described above, according to the present invention, more compressive force can be applied to the magnet portion, so that the rotation resistance of the magnet portion can be improved, and the rotational speed can be further improved. .

[Brief description of the drawings]

FIG. 1 is a partially broken schematic perspective view showing a main part of a superconducting magnetic bearing device according to a specific example of the present invention.

FIG. 2 is a graph showing a stress state at each position in a radial direction of a rotating body when the multiple hoop is not rotated according to the specific example.

FIG. 3 is a side view of a normal hoop member, and FIG. 3 (2) is a plan view of the hoop member.

FIG. 4 is a side view of a textile hoop member, and FIG. 4 (2) is a plan view of the hoop member.

FIG. 5 is a schematic perspective view showing the production of the raw material of the woven hoop member of the specific example.

6 (a) and 6 (b) show a process of manufacturing a woven hoop member of this specific example, and (1) is a schematic perspective view showing a used portion of a base material;
(2) is a conceptual diagram illustrating the fiber density in the radial direction.

FIG. 7 is a perspective view showing an individual disk woven fabric as a constituent member of a woven hoop member according to the specific example, and (2).
FIG. 3 is a perspective view showing a woven hoop member formed by laminating disk woven fabrics.

FIG. 8 is a longitudinal sectional side view showing a state in which a reinforcing member is assembled using an assembling jig according to this specific example.

[Explanation of symbols]

 Reference Signs List A Fixed body part B Rotating body part 1 Magnet part 2 Magnet ring body 3 Intermediate ring member 4 Hub 4a Soft magnetic yoke 5 Hoop 5A Fabric hoop 5a Disk fabric 5B Normal hoop 10 Ring permanent magnet 11 Assembly jig 12 Base jig 13 Guide jig 14 Pressing jig (pushed pipe-shaped jig) 41 Pushed intermediate hoop

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Fukuo Akiyama 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Japan Inside the Yokohama Research Laboratory (72) Inventor Shigeo Sasamori Shinnaka, Isogo-ku, Yokohama-shi, Kanagawa 1 Haramachi Japan Composite Materials Co., Ltd.

Claims (6)

[Claims] A magnet unit mounted on a rotating body of a superconducting magnetic bearing device includes an annular permanent magnet concentric with the axis of the rotating body, and an outer peripheral side of the annular permanent magnet includes the annular permanent magnet. In a magnet part reinforcing structure equipped with a reinforcing member for compressing a permanent magnet in a radial direction and a circumferential direction, the reinforcing member is made of carbon fiber-reinforced plastic (CF
RP) is a ring-shaped member, wherein the carbon fibers include circumferential fibers and radial fibers, wherein the magnet portion reinforcing structure of the superconducting magnetic bearing device is provided. 2. The ring-shaped reinforcing member is provided in a multiplex manner, and at least the innermost circumferential reinforcing member is provided with a circumferential carbon fiber and a radial carbon fiber. 2. A structure for reinforcing a magnet part of a superconducting magnetic bearing device according to claim 1. 3. The superconducting magnetic bearing device according to claim 1, wherein the reinforcing member is formed by laminating a plurality of arc-shaped cloths woven by intersecting carbon fibers vertically and horizontally. Magnet reinforcement structure. 4. The superconducting member according to claim 1, wherein the reinforcing member is formed by laminating a plurality of disk-shaped woven fabrics in which fibers are arranged in a radial direction and a circumferential direction. Magnet part reinforcement structure of magnetic bearing device. 5. The reinforcing member has an elastic modulus (E) in a circumferential direction.
D) is 10,000 to 25,000 [Kg / mm ² ],
The elastic modulus (Er) in the radial direction is 2,000 to 6,000
^{2. The} structure for reinforcing a magnet part of a superconducting magnetic bearing device according to claim 1, wherein [Kg / mm ² ]. 6. The structure for reinforcing a magnet part of a superconducting magnetic bearing device according to claim 2, wherein an intermediate ring member made of a titanium alloy is interposed between the reinforcing members provided in multiple layers.