JPH05217740A - Superconducting magnet structure for magnetic levitation train - Google Patents

Abstract

PURPOSE:To provide a method of supporting a superconducting magnet in such a manner that a maximum natural frequency is achieved with limited rigidity. CONSTITUTION:A superconducting magnet structure includes supports 1 having great rigidity in three directions, supports 4 having great rigidity only toward the outside of the magnet surface, and supports 3 having great rigidity only toward the inside of the magnet surface. These supports are arranged properly depending on the rotational inertia of the superconducting magnet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic levitation train using a superconducting magnet which is currently being developed for practical use, and relates to a method for supporting a superconducting magnet for reducing vibration of the superconducting magnet.

[0002]

2. Description of the Related Art Conventionally, a low vibration structure for a magnetic levitation train has been filed for reducing vibration generated in a vehicle in order to improve riding comfort. However, it cannot be said that the vibration reduction in the superconducting magnet structure itself is fully considered. However, it is essential to consider reducing the vibration of superconducting magnets for the following reasons.

A magnetic levitation train is propelled and levitated by a propulsion coil 8 and a levitation coil 7 which are provided with a superconducting magnet 4 on a vehicle body 10 and are provided on the ground as shown in FIGS.
Reference numeral 9 is a bogie frame. This principle will be briefly described.

The magnetic levitation train is driven by the principle of a linear synchronous motor. That is, for example, when the vehicle body is at the position A in FIG. 12, a current is applied to the ground propulsion coil 8 in the direction of the solid arrow. At this time, the vehicle body 10 receives a force in the direction of the arrow in this figure to propel according to Fleming's left-hand rule.

Next, when the vehicle body 10 reaches the position B, an electric current is passed in the direction of the broken line. That is, the direction of current flow is switched for the middle coil in this figure.
Then, again, the vehicle body 10 receives a force in the direction of the arrow in this figure and advances in the same direction. By repeating this, the vehicle body can continue to move in the same direction. This is the propulsion principle.

Next, the principle of levitation will be described. When the vehicle body travels on the principle described here, an induced current is generated in the levitation coil 7 installed on the ground as shown in FIG. The induced current flows in a direction of canceling the magnetic field generated by the superconducting magnet 4 attached to the vehicle body 10. Therefore, a magnetic repulsive force is generated to levitate the vehicle body. This is the levitation principle.

As described above, the superconducting magnetic levitation train levitates by the magnetic force generated by the ground coil installed on the ground and the superconducting magnet. Since the N-pole and the S-pole of the ground coil change alternately, the superconducting magnet moving on the ground coil receives the fluctuating magnetic field generated by the switching of the N-pole and the S-pole.

Therefore, a secondary current is induced in the outer tank containing the superconducting magnet. The induced current and the magnetic field of the superconducting magnet generate electromagnetic force according to Fleming's law. This electromagnetic force causes the superconducting magnet to vibrate. Since the superconducting magnet needs to be kept at an extremely low temperature (absolute 4 degrees of the helium temperature), it is important to suppress vibration that may cause heat generation or the like. Therefore, in the superconducting magnetic levitation train, it is necessary to consider a low vibration structure for the superconducting magnet structure itself.

As a conventional technique of this kind, there is, for example, the technique described in JP-A-55-87000.

[0010]

However, few inventions have hitherto been conceived of anti-vibration measures for the superconducting magnet itself, and the anti-vibration measures have not necessarily been sufficient. In particular, trains often run at a constant speed, but when they run at a constant speed, they will be subjected to electromagnetic excitation force based on the frequency determined by the traveling speed and the grounding interval of the levitation coil on the ground. .. In addition, the ground coils are installed at equal intervals in a discrete manner, and therefore, in addition to the fundamental frequency described above, the harmonic components also vibrate in a complex manner. For this reason, it is necessary to consider a mechanism that reduces vibration during traveling.

An object of the present invention is to avoid resonance of the superconducting magnet and prevent heat generation of the superconducting magnet when the magnetic levitation train using the superconducting magnet continues to receive electromagnetic excitation force while running and vibrates greatly. To give means.

[0012]

In order to achieve the above object, the present invention provides a structure for supporting a superconducting magnet with high rigidity.

That is, in order to support and fix the superconducting magnet to the outer tank with high rigidity, at least one load support having a large rigidity in the three axis directions is provided, and the weight of the superconducting magnet and the basic rigidity in the three axis directions are provided. To secure.

The superconducting magnet structure for a magnetic levitation train according to the present invention comprises a superconducting magnet cooled to an extremely low temperature (helium temperature absolute 4K), an inner tank filled with helium for cooling the superconducting magnet, and In a superconducting magnet structure including a radiation shield plate for insulating the tank and an outer tank for keeping them in a vacuum state, the superconducting magnet has high rigidity in three axial directions to support the superconducting magnet with high rigidity. It is characterized in that at least one load support is provided.

Desirably, one of the following aspects is preferable.

(1) A load support having great rigidity in the three-axis directions and at least one load support having great rigidity in the one-axis directions are provided, and a load support having great rigidity in the three-axis directions. A structure that compensates for insufficient rigidity by itself.

(2) A load support having a large rigidity in the uniaxial direction, which has a large rigidity in the out-of-plane direction of the superconducting magnet, or a large rigidity in the in-plane direction perpendicular to the straight portion of the racetrack-shaped superconducting magnet. Use one with or both.

(3) The load support having a large rigidity in the three axial directions is provided at any place on the surface of the inner tank covering the superconducting magnet and has a structure for directly supporting the inner tank.

(4) The load support having a large rigidity in the uniaxial direction is provided at any place on the surface of the inner tank covering the superconducting magnet and has a structure for directly supporting the inner tank.

(5) The load support having a large rigidity in the three axial directions is provided on the straight portion of the surface of the inner tank covering the racetrack-shaped superconducting magnet and directly supports the inner tank.

(6) The above-mentioned three types of different load supports are properly provided at positions where the translational and rotational modes of the superconducting magnet are suppressed. That is, in the center of the straight portion of the inner tank that covers the racetrack-shaped superconducting magnet, there is a load support having a large rigidity in the three axial directions, and a corner.
, A load support having a large rigidity in the uniaxial direction outside the plane of the superconducting magnet, and a load support having a large rigidity in the uniaxial direction in the plane perpendicular to the linear portion of the superconducting magnet at both ends of the arc part. The superconducting magnet is provided with a structure such that translation, rolling, yawing, and pitching vibration modes are less likely to occur.

(7) The load support having great rigidity in the three axial directions is provided near the center of the inner tank covering the racetrack-shaped superconducting magnet and has a structure for directly supporting the inner tank.

(8) A load support having great rigidity in the uniaxial direction outside the surface of the superconducting magnet is placed on the surface of the inner tank covering the racetrack-shaped superconducting magnet, and a vibration mode for bending or twisting the superconducting magnet. A large number of short spans are provided to directly support the inner tank so that there is no rust.

[0024]

According to the above construction, the translation, rolling, yawing and pitching modes of the superconducting magnet can be made less likely to occur, and the superconducting magnet can be most rigidly provided within a limited rigidity range. Since the magnet can be supported, the superconducting magnet is less likely to resonate when receiving an external force.

[0025]

Embodiments of the present invention will be described with reference to FIGS. 1 to 5 and FIG.
Will be explained.

The superconducting magnet 4 is inserted in a container 5 called an inner tank filled with liquid helium. The absolute temperature inside the inner tank 5 is kept at 4 degrees by liquid helium. The inner tank 5 is surrounded by a radiation shield plate (not shown), which is kept at an absolute temperature of 80 degrees by nitrogen. The radiation shield plate is further housed in the outer tank 6, and the outer tank 6 is kept in a vacuum for heat insulation. The outer tank 6 is usually provided with a plurality of radiation shield plates.

The members for supporting and fixing the superconducting magnet are load supports 1, 2, and 3. The inner tank 4 containing the superconducting magnet 4 is supported and fixed to the outer tank 6 by these load supports.

In the first embodiment of the present invention, load supports having appropriate rigidity are arranged as shown in FIG. That is, in order to support the load of the superconducting magnet 4, the load support 1 having great rigidity in the three axis directions is arranged at the center of the straight portion of the inner tank 5 which accommodates the racetrack-shaped superconducting magnet.

Further, in order to suppress a mode which cannot be sufficiently suppressed by the load support 1 having a large rigidity in the three axis directions,
The load support 2 having a large rigidity in the uniaxial direction in the plane perpendicular to the straight portion of the racetrack-shaped superconducting magnet 4 (that is, having a large rigidity in the uniaxial direction in the superconducting magnet surface),
In the arc portion of the inner tank 5 that houses the superconducting magnet, the load support 3 having a large rigidity in the uniaxial direction outside the surface of the superconducting magnet,
It is provided in the corner portion of the inner tank 5 which houses the superconducting magnet. The rigidity of the entire load support is within the limit of the amount of heat that can enter the superconducting magnet.

A load support having a large rigidity in the three-axis directions and a load support having a large rigidity in the one-axis directions will be described with reference to FIGS. 6 to 9. First, as shown in FIG. 6, a load support having a large rigidity in the three-axis direction is a combination of cylindrical members 11 (for example, made of FRP) having different diameters in multiple concentric circles. Since it is a cylindrical member, it has rigidity determined by the cross-sectional modulus and Young's modulus in the longitudinal direction of the cylinder. In addition, since they are superposed in a concentric manner in multiple layers, great rigidity is secured in the diameter direction of the cylinder. As a material, FRP having high rigidity and high heat insulating effect is used.

On the other hand, the load support having a large rigidity in the uniaxial direction is a rod-shaped member (cylindrical member) having a circular cross section as shown in FIG. This member also has a large rigidity in the longitudinal direction, which is determined by the section modulus and Young's modulus. Since this rod only needs to have a large rigidity in only one axial direction (longitudinal direction), it is desirable that the rod be as thin as possible within the range in which the required rigidity is ensured in the longitudinal direction. The material is FR with high rigidity and high heat insulation.
P is used.

When this member on the rod is used as a load support having a great rigidity in the direction of one axis in the surface of the superconducting magnet, the member should support the inner tank 5 of the superconducting magnet 4 horizontally as shown in FIG. To On the other hand, this member is
When it is used as a load support having great rigidity in the axial direction, this member vertically supports the inner tank 5 of the superconducting magnet 4 as shown in FIG.

In the second embodiment of the present invention, load supports 1, 2 and 3 having appropriate rigidity are arranged as shown in FIG.
That is, in order to support the load of the superconducting magnet 4, the load support 1 having great rigidity in the three axis directions is arranged at the center of the straight portion of the inner tank 5 which accommodates the racetrack-shaped superconducting magnet.

Further, in order to suppress a mode which is not sufficiently suppressed by the load support 1 having a large rigidity in the three axial directions, the load support 3 and the superconducting material having a large rigidity in the uniaxial direction out of the plane of the superconducting magnet 4 are suppressed. A load support body 2 having a large rigidity in the direction of one axis in a plane perpendicular to the linear portion of the magnet is provided at both ends of an arc portion of an inner tank 5 for accommodating a superconducting magnet 4 having a racetrack shape. The rigidity of the entire load support is still within the limit of the amount of heat that can enter the superconducting magnet.

In the third embodiment of the present invention, load supports 1, 2 and 3 having appropriate rigidity are arranged as shown in FIG. That is,
In order to support the load of the superconducting magnet 4, a load support 1 having a large rigidity in the three axial directions is arranged near the center of the inner tank 5 which houses the racetrack-shaped superconducting magnet.

Further, in order to suppress a mode which is not sufficiently suppressed by the load support 1 having a large rigidity in the three axial directions, the load support 3 having a large rigidity in the uniaxial direction out of the plane of the superconducting magnet 4 is mounted. -The load supporting member 2 having a large rigidity in the linear portion of the inner tank 5 for accommodating the superconducting magnet 4 in the shape of a track and in the direction perpendicular to the linear portion of the superconducting magnet is provided in the arc portion of the inner tank 5. Are provided at both ends of. The rigidity of the entire load support is still within the limit of the amount of heat that can enter the superconducting magnet.

In the fourth embodiment of the present invention, load supports 1, 2 and 3 having appropriate rigidity are arranged as shown in FIG. First, in order to support the load of the superconducting magnet 4, two load supports 3 having great rigidity in the three axial directions are arranged in the center of the straight portion of the inner tank 5 for accommodating the superconducting magnet 4 having the racetrack shape. Next, in order to suppress a mode which is not sufficiently suppressed by the rigidity of the load supporting body, the load supporting body 3 having a large rigidity in the uniaxial direction out of the plane of the superconducting magnet is formed into the racetrack-shaped superconducting magnet 4. Further, in the corner portion of the inner tank 5 for accommodating, the load supporting body 2 having a large rigidity only in one axis direction in a plane perpendicular to the straight portion of the superconducting magnet 4 is formed in the arc portion of the inner tank 5 for accommodating the superconducting magnet 4. Is provided at the boundary of the straight line portion.
Similarly, the rigidity of the entire load support is within the limit that allows penetration into the superconducting magnet.

In the fifth embodiment of the present invention, the load supports 1, 2 and 3 having appropriate rigidity are arranged as shown in FIG.
That is, the load support 1 having a large rigidity in the triaxial direction and the load support 2 having a large rigidity in the in-plane direction of the superconducting magnet are provided at the same positions as in the first embodiment (FIG. 1) of the present invention. A large number of load supports 3 having great rigidity in the out-of-plane direction of the superconducting magnet are provided in the corner portion of the inner tank 5 within the range of allowable heat penetration.

In the sixth embodiment of the present invention, load supports 1, 2 and 3 having appropriate rigidity are arranged as shown in FIG. That is, the load support 1 having a large rigidity in the triaxial direction and the load support 2 having a large rigidity in the in-plane direction of the superconducting magnet are provided at the same positions as in the first embodiment (FIG. 1) of the present invention. A large number of load supports 3 having a large rigidity in the out-of-plane direction of the superconducting magnet are provided in the inner tank 5 with a short span so that local deformation such as bending and twisting of the superconducting magnet is unlikely to occur.

The load support 3 having a great rigidity in the uniaxial direction outside the surface of the superconducting magnet is preferably provided at the antinode of the vibration mode of bending and twisting of the superconducting magnet. The rigidity of the entire load support is still within the limit that allows penetration into the superconducting magnet.

In addition, in the third embodiment, the load support 3 having rigidity in the uniaxial direction outside the surface of the superconducting magnet is not limited to the straight portion of the inner tank 5 which accommodates the racetrack-shaped superconducting magnet. It may also be provided in the corner section.

[0042]

According to the present invention, the superconducting magnet is supported with the highest rigidity, that is, with the highest natural frequency of the superconducting magnet, within the range in which the load support having the given rigidity is used. Therefore, it helps avoid the resonance of the superconducting magnet and has a great effect in reducing vibration.

[Brief description of drawings]

FIG. 1 is a support position of a superconducting magnet according to a first embodiment of the present invention.

FIG. 2 is a support position of a superconducting magnet according to a second embodiment of the present invention.

FIG. 3 is a support position of a superconducting magnet according to a third embodiment of the present invention.

FIG. 4 is a support position of a superconducting magnet according to a fourth embodiment of the present invention.

FIG. 5 is a support position of a superconducting magnet according to a fifth embodiment of the present invention.

FIG. 6 is an explanatory diagram of a load support having a large rigidity in three axis directions.

FIG. 7 is an explanatory diagram of a member used for a load support having a large rigidity in a uniaxial direction.

FIG. 8 is an explanatory diagram for supporting the in-plane direction of the superconducting magnet.

FIG. 9 is an explanatory diagram for supporting the superconducting magnet in an out-of-plane direction.

FIG. 10 is a front view showing the structure of a magnetic levitation train system.

FIG. 11 is a side view showing the structure of a magnetic levitation train system.

FIG. 12 is an explanatory diagram showing a propulsion principle of a magnetic levitation train.

FIG. 13 is an explanatory diagram showing a levitation principle of a magnetic levitation train.

FIG. 14 is an explanatory diagram of a supporting position of a superconducting magnet according to a sixth embodiment of the present invention.

[Explanation of symbols]

1 ... A load support having a large rigidity in three axial directions, 2 ... A load support having a large rigidity in one out-of-plane direction of the superconducting magnet, 3 ... A large rigidity in one in-plane direction of the superconducting magnet Load support, 4 ... Superconducting magnet, 5 ... Inner tank, 6 ... Outer tank,
7 ... levitating coil, 8 ... propulsion coil, 9 ... bogie frame, 10
… Body.

Front Page Continuation (72) Inventor Kihachiro Tanaka, 502 Kintatemachi, Tsuchiura-City, Ibaraki Prefecture, Hiritsu Seisakusho Co., Ltd. (72) Inventor Tadashi Sonobe 4-6 Kanda Surugadai, Chiyoda-ku, Tokyo Hitachi, Ltd. (72) Inventor Teruhiro Takizawa 4-6 Kanda Surugadai, Chiyoda-ku, Tokyo (72) Invented by Hitachi, Ltd. (72) Fumio Suzuki 4-6 Kanda Surugadai, Chiyoda-ku, Tokyo, Hitachi, Ltd. (72) Inventor Fumihiko Goto 3-2-1, Saiwaicho, Hitachi, Ibaraki Hitachi Engineering Co., Ltd.

Claims (9)

[Claims] 1. A superconducting magnet cooled to an extremely low temperature, an inner tank filled with helium for cooling the superconducting magnet, a radiation shield plate for insulating the inner tank, and keeping them in a vacuum state. In a superconducting magnet structure including an outer tank for a magnetic levitation train, at least one load support having great rigidity in three axial directions is provided to support the superconducting magnet with high rigidity. Magnet structure. 2. The load supporting body according to claim 1, which has a high rigidity in three axial directions for supporting the superconducting magnet with high rigidity, and at least one uniaxial (uniaxial) supporting member.
A superconducting magnet structure for a magnetic levitation train, characterized in that a load support having great rigidity in a direction is provided in combination. 3. A magnetic material according to claim 2, wherein a load supporting body having a large rigidity in a uniaxial direction is used to support an in-plane direction and / or an out-of-plane direction of the superconducting magnet. Superconducting magnet structure for levitating trains. 4. A load supporting body having a large rigidity in the three axial directions is provided at least at one position on the surface of the inner tank covering the racetrack-shaped superconducting magnet. Superconducting magnet structure for magnetic levitation trains. 5. A load supporting body having great rigidity in one axis direction is provided at least at one position on the surface of the inner tank covering the racetrack-shaped superconducting magnet. Superconducting magnet structure for magnetic levitation trains. 6. A load support having great rigidity in three axial directions is provided at a central position of at least one linear portion on the surface of the inner tank of the racetrack-shaped superconducting magnet. A characteristic superconducting magnet structure for a magnetic levitation train. 7. The means for supporting a superconducting magnet according to claim 2, wherein in the inner tank covering the superconducting magnet having a racetrack shape, a load having great rigidity in three axial directions is provided at the center of the straight portion of the inner tank. The support, the corner portion of the racetrack-shaped inner tank, the load support having a large rigidity in the uniaxial direction that suppresses the out-of-plane direction of the superconducting magnet, and the superconducting magnets at both ends of the arc portion of the superconducting magnet. Suppresses the in-plane direction at right angles to the straight part of 1
A superconducting magnet structure for a magnetic levitation train, characterized in that a load support having great rigidity is arranged in the axial direction. 8. A load supporting body having great rigidity in three axial directions according to claim 1, wherein at least one load supporting body is provided near a central portion of an inner tank of a racetrack-shaped superconducting magnet. A superconducting magnet structure for a magnetic levitation train. 9. The means for supporting a superconducting magnet according to claim 2, wherein in the inner tank covering the superconducting magnet having a racetrack shape, a load having great rigidity in three axial directions is provided at the center of the straight portion of the inner tank. A load supporting body having a large rigidity in the uniaxial direction in the plane of the superconducting magnet is provided at both ends of the arcuate portion of the inner tank that covers the racetrack-shaped superconducting magnet. In the inner tank to be covered, a large number of load supports having a large rigidity in the uniaxial direction that suppresses vibrations outside the surface of the superconducting magnet are arranged with a short span so that local deformation such as bending and twisting does not easily occur. Superconducting magnet structure for levitating trains.