CN106080256A - A kind of improve the method for vehicle magnetic suspension performance, high temperature superconducting magnetic suspension system and magnetic suspension train - Google Patents
A kind of improve the method for vehicle magnetic suspension performance, high temperature superconducting magnetic suspension system and magnetic suspension train Download PDFInfo
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- CN106080256A CN106080256A CN201610626916.7A CN201610626916A CN106080256A CN 106080256 A CN106080256 A CN 106080256A CN 201610626916 A CN201610626916 A CN 201610626916A CN 106080256 A CN106080256 A CN 106080256A
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- magnetic suspension
- track
- vehicle
- superconducting
- high temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L13/00—Electric propulsion for monorail vehicles, suspension vehicles or rack railways; Magnetic suspension or levitation for vehicles
- B60L13/04—Magnetic suspension or levitation for vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61B—RAILWAY SYSTEMS; EQUIPMENT THEREFOR NOT OTHERWISE PROVIDED FOR
- B61B13/00—Other railway systems
- B61B13/08—Sliding or levitation systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2200/00—Type of vehicles
- B60L2200/26—Rail vehicles
Abstract
The invention discloses and a kind of improve the method for vehicle magnetic suspension performance, high temperature superconducting magnetic suspension system and magnetic suspension train.The present invention, by putting superconducting block, makes c-axis setting direction the most parallel with the direction in the magnetic field of track such that it is able to improves the suspending power of vehicle, and enables the vehicle to smooth-ride by increasing buffer gear.
Description
Technical field
The present invention relates to high-temperature superconducting magnetic levitation technical field, particularly relate to a kind of side improving vehicle magnetic suspension performance
Method, high temperature superconducting magnetic suspension system and magnetic suspension train.
Background technology
High-temperature superconducting magnetic levitation technology, due to the flux pinning properties that high-temperature superconductor is unique, has passive self-stabilization
Suspension advantage, shows good application prospect in fields such as frictionless bearing, flywheel energy storage, track traffics.Wherein, 2000
It is novel in future that the birth of the manned high-temperature superconducting magnetic levitation laboratory vehicle in first of the world of China illustrates high-temperature superconducting magnetic levitation technology
The huge captivation of (at a high speed, environmental protection, the feature such as comfortable) track vehicle, causes the extensive concern of international community.At present,
The state such as German, Russian, Brazilian, Japanese all develops high temperature superconductor magnetic levitation vehicle model machine, and each state all advances high temperature to surpass making great efforts
The practicalization of magnetic conduction levitation vehicle.Improve the bearing capacity of existing high temperature superconductor magnetic levitation vehicle system the most further and stablize
Performance, becomes one of them technology emphasis.
Superconducting block is one of core in high temperature superconducting magnetic suspension system, is usually fixed in low-temperature (low temperature) vessel.At present,
There is the superconducting block of three three seed crystal YBa2Cu3O7-x being uniformly distributed seed shaft (c-axis) compared to single seed crystal bulk in performance
On more excellent, be therefore widely used in high temperature superconducting magnetic suspension system.Research finds, high-temperature superconductor material YBa2Cu3O7-x
Crystals a-b face on conductivity will be apparently higher than the conductivity on the c-axis direction being perpendicular to a-b face, the former is critical
Electric current density size is about about 3 times of the latter.But utilize very well at present this characteristic to improve high temperature superconducting magnetic suspension system, or
After person utilizes this characteristic, high temperature superconducting magnetic suspension system does not obtain preferably effect.
Summary of the invention
For above-mentioned technical problem present in prior art, the invention provides a kind of high temperature superconducting magnetic suspension system and
Having the magnetic suspension train of this high temperature superconducting magnetic suspension system, this high temperature superconducting magnetic suspension system can improve magnetic suspension performance,
And there is good damping performance.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
A kind of method improving vehicle magnetic suspension performance, comprises the following steps: S10: make the vertical component in the magnetic field of track
The c-axis of the superconducting block accounting for leading position is vertically arranged, and makes the horizontal component in the magnetic field of track account for the super of leading position
The c-axis of guide block is horizontally disposed with to improve the suspending power of vehicle；S20: make vehicle obtain shock-absorbing function at vertical direction.
The invention also discloses a kind of high temperature superconducting magnetic suspension system, including: magnetic suspension mechanism, it includes by permanent magnetism system
Become track, be arranged on the low-temperature (low temperature) vessel above described track and be arranged in described low-temperature (low temperature) vessel by multiple superconducting block edges
The superconducting block layer that the arrangement of described track width direction is formed；Wherein: the leading overlying regions of the vertical component in the magnetic field of track
The c-axis of superconducting block is vertically arranged, and the c-axis of the superconducting block of the leading overlying regions of the horizontal component in the magnetic field of track is horizontally disposed with.
Buffer gear, it is arranged between vehicle frame and described low-temperature (low temperature) vessel to slow down the motion at vertical direction of the described vehicle frame.
Preferably, described track is unimodal magnetic field structure or the multimodal magnetic field structure arranged at width.
Preferably, described buffer gear includes being fixed on the cylinder body on described low-temperature (low temperature) vessel top, being arranged on described cylinder body
Becoming upper chamber and the piston of lower chambers and upper end to be fixed on described vehicle frame respectively in chamber and by described chamber, lower end is stretched into
The piston rod that described cylinder body is connected with described piston；Wherein: be equiped with entrance and exit on described piston the most corresponding and described
The first check valve that upper chamber connects with described lower chambers and entrance and exit the most corresponding with described lower chambers and described on
Second check valve of chamber.
Preferably, described upper chamber and described bottom chamber are respectively arranged with damping spring and lower damping spring.
The invention also discloses a kind of magnetic suspension train, including vehicle frame, also include being arranged between described vehicle frame and track
Above-mentioned high temperature superconducting magnetic suspension system.
Compared with prior art, the present invention improve the method for vehicle magnetic suspension performance, high temperature superconducting magnetic suspension system and
Magnetic suspension train provides the benefit that: the present invention, by putting superconducting block, makes c-axis setting direction just and the side in magnetic field of track
To parallel such that it is able to improve the suspending power of vehicle, and enable the vehicle to smooth-ride by increasing buffer gear.
Accompanying drawing explanation
Fig. 1 is the structural representation of the high temperature superconducting magnetic suspension system of the present invention；
Fig. 2 tests and uses Halbach tracks of permanent magnetism structure and Flux distribution, and wherein the direction of arrow represents the magnetization of permanent magnet
Direction；
Fig. 3 tests and locates Distribution of Magnetic Field with 15mm above Halbach tracks of permanent magnetism: conjunction magnetic field, normal direction and tangential magnetic field component；
Fig. 4 is the effect schematic diagram that the c-axis direction of superconducting block is perpendicular to external magnetic field；
Fig. 5 is the effect schematic diagram that the c-axis of superconducting block is oriented parallel to external magnetic field；
Fig. 6 is the zoomed-in view of the local A of Fig. 1.
In figure:
10-track；20-low-temperature (low temperature) vessel；30-superconducting block layer；31-superconducting block；40-buffer gear；41-cylinder body；42-lives
Plug；43-piston rod；Damping spring under 44-；45-the first check valve；46-the second check valve；The upper damping spring of 47-；50-vehicle frame.
Detailed description of the invention
For making those skilled in the art be better understood from technical scheme, below in conjunction with the accompanying drawings and specific embodiment party
The present invention is elaborated by formula.
The preferred embodiments of the present invention provide a kind of method improving vehicle magnetic suspension performance, comprise the following steps:
S10: make the c-axis of the superconducting block 31 that the vertical component in the magnetic field of track accounts for leading position be vertically arranged, make the magnetic field of track
The c-axis of the horizontal component superconducting block 31 that accounts for leading position be horizontally disposed with；S20: make vehicle obtain damping at vertical direction
Function.The present invention, by putting superconducting block 31, makes c-axis setting direction the most parallel with the direction in the magnetic field of track 10, it is thus possible to
Enough improve the suspending power of vehicle, and enable the vehicle to smooth-ride by increasing the shock-absorbing function on vertical direction.
In high temperature superconducting magnetic suspension system, the suffered suspending power of superconducting block 31 is close with the size of external magnetic field and gradient
Relevant.Wherein, the graded of external magnetic field determines the faradic current size within superconducting block 31, faradic current and external magnetic field
Determine the vertically and horizontally component of final Lorentz force, suspending power and guiding force corresponding Lorentz force respectively.Therefore, in order to make
Superconducting block 31 has given play to optimal magnetic suspension performance, needs to provide a rational external magnetic field knot according to the combining form of bulk
Structure.Fig. 2 and Fig. 3 sets forth the Distribution of Magnetic Field at the Flux distribution of experiment Halbach tracks of permanent magnetism and surface 15mm,
As can be seen from the figure maximum in vertical magnetic-field component Bn in permanent magnet pole position, tracks of permanent magnetism by-level magnetic-field component Bt
Maximum.As shown in Figure 4, at position of magnetic pole, (c-axis of superconducting block 31 and magnetic when tracks of permanent magnetism is just put by the ab face of superconducting block 31
Field direction is parallel) best results；But in tracks of permanent magnetism middle position, magnetic flux line is nearly all in the horizontal direction, i.e. superconducting block
31c axle and magnetic direction are 90 ° of angles, and the ab face now with more high current density does not fully act on external magnetic field, such as Fig. 5
Shown in, when time identical with outer magnetic field direction for the c-axis placing direction of superconducting block 31, action effect will more preferably.
In order to verify this design philosophy, to the superconducting block 31 of different pose pattern in the magnetic suspension performance of various location
It is carried out checking.In order to describe conveniently, call crest at the magnetic pole that vertical component magnetic field is maximum, the vertical magnetic of orbit centre
The place of field component minimum is referred to as trough, and trough is also the place that horizontal component ofmagnetic field is maximum.High-temperature superconducting magnetic levitation is utilized to survey
The suspending power of the superconducting block 31 that level at crest and trough puts (conventionally form) and vertical display is tested by electricity testing device.
Implementing checking to show when superconducting block 31 level is put, at crest, suspending power is more than suspending power at trough；And superconduction
During block 31 vertical display, at trough, suspending power is more than suspending power at crest；And superconducting block 31 suspending power of vertical display at trough
The level of being greater than puts the suspending power of superconducting block 31.Experimental result again demonstrates the horizontal pose pattern of superconducting block 31 at crest and hangs
Buoyancy is optimal, is can to improve it to hang when illustrating simultaneously and change the superconducting block 31 that level at former wave trough position is put into vertical display
Buoyancy energy.Putting in view of superconducting block 31 level and occupying just width to tracks of permanent magnetism is 32mm, and after vertical display, this width
Becoming the height 13mm (as shown in Figure 5) of original superconducting block 31, i.e. under same space, superconducting block 31 at least can be with vertical pendulum
Put 2 pieces.Principle according to approximation superposition can extrapolate suspending power during 2 pieces of superconducting blocks 31 of vertical display.At wave trough position,
When 2 pieces of superconducting blocks 31 of vertical display, the maximum suspending power at test height 10mm is approximately: 104.6N × 2=209.2N,
The 92.1N put much larger than level.This explanation uses vertical display form at trough, makes the superconduction with more high current density
Block 31ab face fully acts on track tangential component magnetic field, and the suspendability of superconducting block 31 also has the biggest rising space.
1, table cold height 30mm superconducting block 3131 is maximum suspending power and guiding force at different disposing ways and test position
Note: when (× 2) expression during vertical pendulum is let pass in table occupies same width, with vertical display two pieces, therefore can take advantage of
With coefficient 2.
Table 1 provides under typical working condition (field cold height FCH30mm) superconducting block 31 in different disposing ways and test
The maximum suspending power of position, improves its magnetcisuspension buoyancy by the change axial arrangement of superconducting block 31c as can be seen from Table 1
The method of energy is feasible and effect is notable.At wave trough position, the level of superconducting block 31 is put after becoming vertical display, superconducting block
Approximation is obtained the lifting from 92.1N → 209.2N by the suspending power of 31, increases 2.27 times.Therefore, in actual applications, Ke Yigen
According to actual demand, design the c-axis direction arrangement of superconducting block 31 in conjunction with the structure of tracks of permanent magnetism and Distribution of Magnetic Field thereof, with realization side
Case target.
As it is shown in figure 1, the preferred embodiments of the present invention disclose a kind of high-temperature superconducting magnetic levitation system based on said method
System, this high temperature superconducting magnetic suspension system can be applicable to track 10 vehicular traffic but is not limited to be applied to this.This high-temperature superconductor magnetcisuspension
Floating system includes magnetic suspension mechanism and buffer gear 40, magnetic suspension mechanism for providing suspending power and guiding force for vehicle so that car
Travelling under certain load condition carrying, buffer gear 40 is for slowing down the motion of vehicle in the vertical direction to buffer vehicle
The vibrations occurred in the process of moving.Wherein, magnetic suspension mechanism specifically includes track 10, low-temperature (low temperature) vessel 20 and multiple superconducting block
31, low-temperature (low temperature) vessel 20 is arranged on the surface of track 10, in multiple superconducting blocks 31 are placed in low-temperature (low temperature) vessel 20 and along the width of track 10
Degree direction arranges and forms superconducting block layer 30, and the present invention it is critical only that: the leading region of the vertical component in the magnetic field of track 10
The c-axis of the superconducting block 31 of top is vertically arranged, the c of the superconducting block 31 of the leading overlying regions of the horizontal component in the magnetic field of track 10
Axle is horizontally disposed with.The present invention, by putting superconducting block 31, makes c-axis setting direction the most parallel with the direction in the magnetic field of track 10,
It is thus possible to improve the suspending power of vehicle, and enable the vehicle to smooth-ride by increasing buffer gear 40.
Preferably, track 10 is unimodal magnetic field structure or the multimodal magnetic field structure arranged at width.
Magnetic force for when high temperature superconducting magnetic suspension system is applied to vehicle, between track 10 and superconducting block 31
Although effect can provide partial buffer effect for the vibrations of vehicle, but also needs list to farthest reduce the vibrations of vehicle
Solely reload buffer mechanism 40, this is also the reason that buffer system is introduced high temperature superconducting magnetic suspension system by the present invention.
Structure or the composition with the buffer gear 40 of cushioning effect can have multiple, such as damping spring, i.e. hold at low temperature
Between device 20 and vehicle frame 50, damping spring is set, utilizes damping spring to occur elastic deformation that vehicle is risen when by mechanical force
To cushioning effect.But damping spring exists the defect at least two parties face: one is, damping spring is for can be because of during vibrations
Substantially stop vehicle vertical to move downward and play obvious cushioning effect, and vehicle vertical during vibrations is upwards transported
Time dynamic, the prevention that moves upward vehicle vertical because of damping spring is indifferent, and (damping spring pressurized is effective, and tension effect
Difference) and the cushioning effect that plays is the strongest；Two are, damping spring is because occurring elastic deformation easily to lose efficacy frequently, even tired
Destroy, and then cause cushioning effect to weaken even losing efficacy.
For improving the damping performance of vehicle, a preferred embodiment of the present invention provides excellent the delaying of a kind of damping effect
Punch mechanism 40, such as Fig. 6 and combine shown in Fig. 1, specifically, buffer gear 40 includes the cylinder body being fixed on low-temperature (low temperature) vessel 20 top
41, it is arranged in the chamber of cylinder body 41 and chamber is become respectively upper chamber's (being provided with hydraulic medium in upper chamber) and lower chambers
The piston 42 of (bottom chamber is provided with hydraulic medium) and upper end are fixed on vehicle frame 50, and cylinder body 41 and piston 42 are stretched in lower end
The piston rod 43 connected, upper chamber and bottom chamber are respectively arranged with damping spring 47 and lower damping spring 44.Wherein: piston
Entrance and exit the first check valve 45 and entrance and exit that correspondence connects respectively it is equiped with upper chamber and lower chambers on 42
The second check valve 46 that correspondence connects with lower chambers and upper chamber respectively, and make the conducting pressure condition of the second check valve 46 set
Being set to when piston rod 43 and piston 42 bear the gravity of whole vehicle, the second check valve 46 is still in closed mode, and works as and hold
When the power being subject to is for numerical value a certain more than vehicle weight, the second check valve 46 turns on, and the turn-on condition for the first check valve 45 can
To be set as any force value.
The reason that above-mentioned buffer gear 40 can play cushioning effect is: when vehicle in the vertical direction shakes
Time, the hydraulic medium of bottom chamber has certain pressure because bearing the gravity of whole vehicle, the second check valve on piston 42
46 close because of not up to turn-on condition, and the first check valve 45 is because having return-stopping function, so that the hydraulic pressure of bottom chamber is situated between
Matter cannot enter upper chamber by the first check valve 45 and the second check valve 46, so that piston rod 43 in the vertical direction is protected
Hold motionless, vehicle smooth-ride in the horizontal direction.Below because of certain reason (as out-of-flatness laid by track 10) cylinder body 41
When running gear (such as low-temperature (low temperature) vessel 20 and superconducting block 31) in the vertical direction occurs vibrations, when running gear is unexpected the most straight up
During motion, the hydraulic medium of bottom chamber by piston 42 extruding and pressure raises, when pressure is increased to the second check valve 46
Turn-on condition time, the second check valve 46 turns on, and the hydraulic medium of bottom chamber enters upper chamber, cylinder by the second check valve 46
Body 41 moves upward with running gear, and running gear and cylinder body 41 will not drive piston 42, piston rod 43 and vehicle upwards to transport
Move or piston 42, piston rod 43 and vehicle move upward slowly, thus reach the purpose of buffering, when running gear is unexpected
When moving straight down, the hydraulic medium in upper chamber by piston 42 extruding and pressure raises, when pressure is increased to first
During the turn-on condition of check valve 45, the first check valve 45 turns on, and the hydraulic medium in upper chamber is entered by the first check valve 45
Lower chambers, cylinder body 41 moves downward with running gear, and running gear and cylinder body 41 will not drive piston 42, piston rod 43 and car
Move downward or piston 42, piston rod 43 and vehicle move downward slowly, thus reach the purpose of buffering.
Above-mentioned buffer gear 40 utilizes hydraulic medium in epicoele under the control of the first check valve 45 and the second check valve 46
Flow between room and lower chambers, so that cylinder body 41 and piston rod 43 form relative motion, and then realize the buffering to vehicle, this
Kind fluid pressure type damping modes is compared the damping modes of damping spring and is had the advantages that buffering is soft, it is often more important that there is not elasticity
The defect lost efficacy, and the bad defect of the damping spring vehicle bumper effect to moving straight up can be overcome.
Turn-on condition for the second above-mentioned check valve 46 can be construed to: when vehicle even running, second is unidirectional
Valve 46 must remain off, and the hydraulic medium of lower chambers the most just can be made to support vehicle, and when running gear is unexpected
When moving upward, piston 42 extrudes lower chambers, when now the pressure of the hydraulic medium of bottom chamber is higher than vehicle even running
Pressure, the turn-on condition of the second check valve 46 is arranged in a certain force value of rising running gear will be made upwards
When moving to a certain degree, the second check valve 46 turns on.
From the explanations above it can be seen that the turn-on condition set by the second check valve 46 closer to vehicle even running at present
The pressure of the hydraulic medium of chamber, the buffering effect of buffer gear 40 is the best.
For improving further the damping effect of buffer gear 40, in a preferred embodiment of the invention, upper chamber and
Bottom chamber is respectively arranged with damping spring 47 and lower damping spring 44, and so, buffer gear 40 utilizes hydraulic way and machine
Two kinds of damping modes of tool mode, substantially increase the damping effect of vehicle.
Additionally, the invention also discloses a kind of magnetic suspension train, including vehicle frame 50, also include being arranged on vehicle frame 50 and track
Above-mentioned high temperature superconducting magnetic suspension system between 10.
Above example is only the exemplary embodiment of the present invention, is not used in the restriction present invention, protection scope of the present invention
It is defined by the claims.The present invention can be made respectively in the essence of the present invention and protection domain by those skilled in the art
Planting amendment or equivalent, this amendment or equivalent also should be regarded as being within the scope of the present invention.
Claims (6)
1. the method improving vehicle magnetic suspension performance, it is characterised in that comprise the following steps:
S10: make the c-axis of the superconducting block that the vertical component in the magnetic field of track accounts for leading position be vertically arranged, make the magnetic of track
The c-axis of the superconducting block that the horizontal component of field accounts for leading position is horizontally disposed with to improve the suspending power of vehicle；
S20: make vehicle obtain shock-absorbing function at vertical direction.
2. a high temperature superconducting magnetic suspension system based on method described in claim 1, it is characterised in that including:
Magnetic suspension mechanism, it includes the track being made up of permanent magnet, is arranged on the low-temperature (low temperature) vessel above described track and setting
The superconducting block layer formed along the arrangement of described track width direction by multiple superconducting blocks in described low-temperature (low temperature) vessel；Wherein:
The c-axis of the superconducting block of the leading overlying regions of the vertical component in the magnetic field of track is vertically arranged, the level in the magnetic field of track
The c-axis of the superconducting block of the leading overlying regions of component is horizontally disposed with.
Buffer gear, it is arranged between vehicle frame and described low-temperature (low temperature) vessel to slow down the motion at vertical direction of the described vehicle frame.
3. high temperature superconducting magnetic suspension system as claimed in claim 2, it is characterised in that described track be unimodal magnetic field structure or
At the multimodal magnetic field structure that width is arranged.
4. high temperature superconducting magnetic suspension system as claimed in claim 2, it is characterised in that described buffer gear includes being fixed on institute
Upper chamber and lower chambers is become respectively in the cylinder body of stating low-temperature (low temperature) vessel top, the chamber being arranged on described cylinder body and by described chamber
Piston and upper end are fixed on described vehicle frame, and lower end stretches into the piston rod that described cylinder body is connected with described piston；Wherein:
It is equiped with entrance and exit respectively corresponding and described upper chamber on described piston and that described lower chambers connects is first unidirectional
Valve and entrance and exit the second check valve that corresponding and described lower chambers and described upper chamber connect respectively.
5. high temperature superconducting magnetic suspension system as claimed in claim 4, it is characterised in that described upper chamber and described bottom chamber
It is respectively arranged with damping spring and lower damping spring.
6. a magnetic suspension train, including vehicle frame, it is characterised in that also include being arranged between described vehicle frame and track such as power
Profit requires high temperature superconducting magnetic suspension system described in 2 to 5 any one.
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| CN201610626916.7A CN106080256B (en) | 2016-08-03 | 2016-08-03 | A kind of method, high temperature superconducting magnetic suspension system and magnetic suspension train improving vehicle magnetic suspension performance |
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| CN106926743A (en) * | 2017-04-06 | 2017-07-07 | 西南交通大学 | Eddy current retarder and magnetically supported vehicle |
| CN111540559A (en) * | 2020-05-11 | 2020-08-14 | 北京机械设备研究所 | Superconducting block mixed arrangement structure for high-temperature superconducting magnetic suspension device |
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| CN111540559A (en) * | 2020-05-11 | 2020-08-14 | 北京机械设备研究所 | Superconducting block mixed arrangement structure for high-temperature superconducting magnetic suspension device |
| CN111540559B (en) * | 2020-05-11 | 2022-03-29 | 北京机械设备研究所 | Superconducting block mixed arrangement structure for high-temperature superconducting magnetic suspension device |
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|---|---|
| CN106080256B (en) | 2018-12-25 |
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