CN1619268A - Measuring device of block high temperature superconductor magnetic suspension floating force and its testing method - Google Patents
Measuring device of block high temperature superconductor magnetic suspension floating force and its testing method Download PDFInfo
- Publication number
- CN1619268A CN1619268A CNA2003101151119A CN200310115111A CN1619268A CN 1619268 A CN1619268 A CN 1619268A CN A2003101151119 A CNA2003101151119 A CN A2003101151119A CN 200310115111 A CN200310115111 A CN 200310115111A CN 1619268 A CN1619268 A CN 1619268A
- Authority
- CN
- China
- Prior art keywords
- magnet
- sample
- temperature
- low
- superconductor magnetic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002887 superconductor Substances 0.000 title claims description 40
- 238000012360 testing method Methods 0.000 title claims description 10
- 239000000725 suspension Substances 0.000 title abstract description 16
- 230000007246 mechanism Effects 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000006073 displacement reaction Methods 0.000 claims abstract description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 52
- 238000005259 measurement Methods 0.000 claims description 31
- 239000007788 liquid Substances 0.000 claims description 28
- 229910052757 nitrogen Inorganic materials 0.000 claims description 26
- 230000008569 process Effects 0.000 claims description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 239000007858 starting material Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 238000010998 test method Methods 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 239000011229 interlayer Substances 0.000 claims description 4
- -1 polyethylene Polymers 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 239000010410 layer Substances 0.000 claims description 2
- 239000006261 foam material Substances 0.000 claims 1
- 238000005339 levitation Methods 0.000 description 17
- 238000013461 design Methods 0.000 description 8
- 230000004907 flux Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 5
- 230000006698 induction Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 229910001172 neodymium magnet Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229920001342 Bakelite® Polymers 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 239000004637 bakelite Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Images
Abstract
The present invention disclosed a block high-temperature superconducting sample magnetic suspension force measuring device and its method. Said device includes a machine frame, a low-temperature container, magnetic body, moving mechanism, measuring element of force and displacement, output signal display unit, drive and control unit, and said moving mechanism is connected with one of low-temperature container and magnetic body.
Description
Technical field
The present invention relates to a kind of block high-temperature superconductor magnetic suspension force measurement mechanism and method of testing.
Background technology
Magnetic buoyancy is the important parameter that characterizes block superconductor characteristic with capturing magnetic field.Though the latter more can be reflected the intrinsic property of material all sidedly, because that test condition requires is complicated, expense is expensive and can not be as material ground conventional sense means.By contrast, magnetic buoyancy ground is measured simple, and for the user, the magnetic buoyancy data are requisite design considerationss, thereby this measurement is widely used under the situation of not destroying sample the quality to bulk and differentiates by people.
Perfect diamagnetism and zero resistance effect are the principal characters of superconductor.When a superconduction is in the external magnetic field, because the effect of diamagnetism and flux pinning effect will induce bucking current in superconductor inside, again because due to the zero resistance effect, bucking current is decay in time hardly.Magnetic field and external magnetic field that the bucking current that continues to flow in superconducting sample produces interact, thereby produce the super-conductive magnetic suspension phenomenon.Super-conductive magnetic suspension technology based on the super-conductive magnetic suspension phenomenon has potential using value at the energy (flywheel energy storage), traffic (magnetic floats car), mechanical industry numerous areas such as (frictionless bearings).
Magnetic suspension force is the important parameter that superconductor is used on magnetic levitation technology.Magnetic suspension force depends on the one hand with the variation of levitation gap and the character of superconductor self depends on to comprise magnetic field intensity and measuring conditions such as distribution, temperature on the other hand.
When a block superconductor was in the magnetic field H that a permanent magnet (PM) produces, magnetic flux line density was distributed in the superconductor in the mode that reduces continuously from outside to inside.This is owing to exist a large amount of flux pinning centers to stop entering of magnetic flux line in the superconductor, forms the uneven distribution that magnetic flux line obtains, thereby generates a permanent current J
c=dH/dx is exactly that superconductor has been magnetized from apparent it seems.Magnetization M (H)=AJ
cD, J in the formula
cBe the critical current density of superconductor, d flows back to a relevant characteristic length of road size with superconducting ring, equals the size of crystal grain in the superconductor.
Usually the magnetic field H as the measuring permanent magnet of magnetic buoyancy (PM) only is about 4000Oe, to be not enough to penetrate superconducting sample, at this moment, and M=-H+H
2/ J
cD, M are not J
cSimple function with d.
Magnetic buoyancy is not only relevant in the magnetization, and is also relevant with magnetic field gradient.Under the situation of one dimension, the magnetic buoyancy of Z direction can be expressed by following formula, F
z=M
zDH/dz.
In sum, the size of magnetic buoyancy except with the performance of superconductor (as J
cAnd grain size) have outside the Pass, also relevant with test condition such as magnetic field intensity H and magnetic field gradient dH/dz.
Summary of the invention
The purpose of this invention is to provide a kind of block high-temperature superconductor magnetic suspension force measurement mechanism and method of testing, utilize device of the present invention and method of testing realize to measure the magnetic buoyancy of high-temperature superconducting block and sample is compared; The magnetic suspension force measurement mechanism that the present invention provides can be given in the magnetic buoyancy that adds superconductor under a magnetic field cooling (be called for short cold) and zero magnetic field cooling (the abbreviation null field is cold) condition and the relation between the levitation gap quantitatively, is the indispensable survey instrument of investigation of materials and Application Design unit.
For achieving the above object, the present invention takes following design proposal: a kind of block high-temperature superconductor magnetic suspension force measurement mechanism, comprise that one is used to support, fix the frame of each functional part, and described functional part comprises:
One puts the low-temperature (low temperature) vessel of tested superconducting sample;
Measure and use magnet;
Travel mechanism, this travel mechanism comprises a vertical movement mechanism at least;
An one power measuring sensor and a displacement measurement element;
The output signal display unit;
One drives and control module;
Described vertical movement mechanism and low-temperature (low temperature) vessel and magnet one of them person link.
A kind of method of testing of block high-temperature superconductor magnetic suspension force, described method step is as follows:
1) sample is fixed on the support in the block high-temperature superconductor magnetic sample suspending power measurement mechanism, with the magnet absorption that is fit on carriage release lever;
2) starter motor, magnet moves down;
Shut down when 3) magnet contacts with superconducting sample, adjust magnet positions and make itself and superconducting sample centering, pit gauge numerical value makes zero, and makes the motor counter-rotating make magnet move to the shutdown of limit switch place away from sample then;
4) note the numerical value of distance between magnet and the superconducting sample;
5) in the low-temperature (low temperature) vessel of block high-temperature superconductor magnetic sample suspending power measurement mechanism, inject liquid nitrogen, make sample under zero magnetic field, be cooled to the 77K temperature; While starter motor and pen recorder;
6) magnet is moved down, write down the data of power and distance simultaneously;
7) contact with superconducting sample to magnet, trigger and relay successively move, and motor is auto-reverse, and magnet moves away from sample, the data of record overall process power and distance.
Advantage of the present invention is: it is convenient to measure, and can guarantee the accuracy and the continuity of measuring process.
Description of drawings
Fig. 1 is superconductor magnetic buoyancy measurement mechanism one an example structure synoptic diagram of the present invention
Fig. 2 is another example structure synoptic diagram of superconductor magnetic buoyancy measurement mechanism of the present invention
Fig. 3 is a vertical movement mechanism structural representation of the present invention
Fig. 4 is a horizontal mobile mechanism structural representation of the present invention
Fig. 5 is the structural representation of container of the present invention and sample fixed mount
Fig. 6 is a drive controlling electrical schematic diagram of the present invention
Fig. 7 is the graph of relation of a typical suspending power and levitation gap
Fig. 8 is the attractive force of test and the graph of relation of levitation gap
Embodiment
As shown in Figure 1 and Figure 2, superconductor magnetic buoyancy measurement mechanism of the present invention comprises that one is used to support, fix the frame 7 of each functional part, one puts the low-temperature (low temperature) vessel 1 of tested superconducting sample, measure with magnet 2, one vertical movement mechanism 3 and a horizontal mobile mechanism are (not shown, be applied among the embodiment shown in Figure 2), the measuring sensor 4,5 of power and displacement and the driving and the control module of output signal display unit 6 and single unit system; Described vertical movement mechanism 3 links with low-temperature (low temperature) vessel 1 or magnet 2.
Column and upper and lower panel that described frame 7 is made by carbon steel constitute.The motor of upper and lower panel difference fixed vertical, horizontal mobile mechanism and gear train, power and displacement measurement element (being power and displacement transducer) 4,5 and the low-temperature (low temperature) vessel 1 that is used for fixing and cools off superconducting sample.Should guarantee not produce resonance in measuring process frame and motor.
But described vertical movement mechanism 3 is formed (referring to Fig. 3) by direct current generator 301, the leading screw 302 of continuous speed adjustment, the screw 303 that has the slide-and-guide groove, leading screw overcoat 304 and screw guide pin 305, and the leading screw of rotation drives the part that is connected with screw and moves up and down.The selection of power of motor and rotating speed is relevant with the size and the translational speed scope of the power of survey superconductor.This vertical movement mechanism both can with 2 be connected for measuring magnet (adopting permanent magnet) more, also can be connected with the container 1 that is used for fixing and cool off superconducting sample.
When vertical movement mechanism was connected with magnet, the below of screw 304 can be a cylinder made of iron, and magnet 2 is adsorbed on cylinder made of iron below and links to each other with travel mechanism and do vertical direction mobile (referring to Fig. 1).The position of magnet on iron block can arbitrarily be adjusted, so that it is coaxial with tested superconduction superconducting sample.
When magnet 2 sizes and weight ratio were big, mobile low-temperature (low temperature) vessel 1 was more convenient.When vertical movement mechanism 3 was connected with low-temperature (low temperature) vessel 1, the below of its screw 303 had the structure that is connected with container, by hinged bolt realization be connected (referring to Fig. 2) with low-temperature (low temperature) vessel.
The cylindrical shape low-temperature (low temperature) vessel is coaxial with leading screw.
Magnetic buoyancy measurement mechanism of the present invention also can be used for measuring when fixing levitation gap, and the acting force between superconducting sample and the magnet during transverse movement is called restoring force or rigidity again, is the important parameter of super-conductive magnetic suspension mechanism stable work.In this case, at first utilize vertical movement mechanism to fix a levitation gap, utilize the horizontal mobile mechanism be installed on the lower panel to promote magnet 2 then or container 1 moves horizontally.Fig. 4 shows the horizontal mobile mechanism synoptic diagram.301 ' is direct current generator among the figure, and 302 ' is leading screw, and 303 ' is screw, the 4th, and force transducer, magnet 2 or low-temperature (low temperature) vessel 1 are connected with transverse moving mechanism 3 via force transducer 4, and slide in front and back on slide rail, to reduce friction.Total power that restoring force equals to measure deducts friction force.
Described low-temperature (low temperature) vessel 1 must use the material of good heat insulating to manufacture: because the superconductor that is placed in the container cools off with liquid nitrogen, and the temperature of liquid nitrogen is 77K (subzero 196 ℃), is easy to consume because of evaporation.In order to reduce the evaporation of liquid nitrogen, low-temperature (low temperature) vessel normally has the canister of vacuum interlayer, can keep liquid nitrogen for a long time.Because the Measuring Time of magnetic buoyancy is shorter, also can use nonmetallic materials to make (as textolite or nylon), for further reducing the evaporation of liquid nitrogen, the inboard attached of container carries out heat insulation with the thick polyethylene foam sheet 101 of about 2cm.
Fig. 5 has provided the structural representation of container 1 and sample fixed mount 8.Following and the force cell 4 of container 1 is connected in series (referring to Fig. 1) on the lower panel that is fixed on frame 7, and superconducting sample 9 is fixed on the specimen holder 8.Low-temperature (low temperature) vessel 1 in the present embodiment synoptic diagram is processed by textolite, and in order further to reduce the evaporation of liquid nitrogen, container inside lining has layer of polyethylene expanded material 101, connects with low temperature is gluing between the two.
Sample fixed mount 8 uses nonferromugnetic materials (as brass) to make, with the bottom of low-temperature (low temperature) vessel with screwed connection, and can regulate the height of specimen mounting to adapt to measurement by the rotation screw thread to the different-thickness sample.Superconducting sample is fixed on the support tightly in measuring process, in order to avoid be moved under the effect of electromagnetic force.The fixedly employing screw of sample is fixed from the side or is bonded to (as the vacuum silicone grease) on the specimen holder with the grease that can harden at low temperatures.
Under the situation of fixed magnets shown in Figure 2, mobile superconducting sample, container 1 is connected with vertical movement mechanism 3, superconducting sample 9 is pressed on the center of container bottom by sample fixed mount 8 with screw.
The size of magnetic buoyancy has much relations with the performance and the shape of testing with magnet, and obviously the magnetic field of magnet generation is high more, and then the magnetic buoyancy of superconducting sample is just big more.The size of the magnet that magnetic property is suitable also can exert an influence to measurement result, adopts the permanent magnet the same or smaller with the size of sample opposite face better.Will pay special attention to keep the temperature-resistant of magnet in measuring process, promptly magnet does not immerse among the liquid nitrogen, because the magnetization of magnet (as NdFeB) can diminish at low temperatures (when 77K, descending 20% approximately).In addition, magnet enters the rapid evaporation that liquid nitrogen can cause liquid nitrogen, thereby the temperature of sample is risen, and also can have a negative impact to test findings.
Superconducting sample should be cooled to liquid nitrogen temperature under the condition away from PM, in order to avoid the magnetic field of magnet penetrates superconducting sample.Magnet drives slowly and continuously mobile with the direct current generator of adjustable speed.The translational speed that experiment showed, magnet is little to power (F) the value influence that records between second at 0.1～1.0mm/; Translational speed further slows down or middle stop can make F descend, and this is because the decay that flux flow and flux creep cause.
When adopting Fig. 1 mode moving magnet to measure, described magnet adopts the NdFeB or the SmCo permanent magnetic material of cylindrical, annular, the cubic bodily form or the just polygon bodily form, its magnetizing direction is shown in arrow among the figure, along the short transverse of magnet, concrete shape is determined according to the shape of tested superconducting sample.Usually, the height of magnet is greater than diameter, to obtain bigger magnetic induction density.
The magnetic induction density of magnet surface is generally about 0.4 tesla, when magnet absorption is on iron block, about table 0.5 tesla of magnet.
In order further to increase magnetic field intensity, can adopt the mode of combination magnet.Shown in arrow among Fig. 2, magnet adopts and laterally magnetizes, and by being clipped in the magnet accumulating cap of two pure iron between the magnet, surface induction intensity can be brought up to about 1 tesla, and obtained the magnetic field of an almost vertical direction above magnet.Because the volume and weight of combination magnet is all bigger, is not easy to as the vertical moving parts.Change fixed magnets in this case into, mobile superconducting sample is measured.
Interaction force between described magnet and the tested superconducting sample is measured by resistance-strain chip pull pressure sensor 4, selects the range of sensor according to the size of the power of sample.Before and after each the measurement, pull pressure sensor is demarcated with standard test weight.
The measurement of levitation gap can be used resistance-type displacement transducer or realizations such as digital pit gauge and slide calliper rule 5.Because the screw of vertical movement mechanism 3 is to be driven by direct current generator to do linear uniform motion, initial distance between superconducting sample and the magnet can accurately be measured simultaneously, thereby each levitation gap constantly also can obtain by translational speed, and corresponding with that power F constantly.
Among the embodiment shown in Figure 1, link to each other with the bottom of low-temperature (low temperature) vessel 1 and be fixed on the lower panel of frame 7 with the pull pressure sensor 4 of a S type, in order to measure the acting force between magnet and the superconducting sample.With a kind of digital vernier depth gauge measurement magnet and the gap between the superconducting sample.The voltage signal of pull pressure sensor 4 outputs outputs to the digital voltmeter demonstration or directly outputs to X-Y recorder or plotting apparatus 6 after direct current amplifier amplifies, note the magnetic buoyancy and the relation curve between the gap of sample and draw, comprise that magnet 2 shifts near and, also can be figure with the computer acquisition output signal by the interface of digital voltmeter away from the variation in superconducting sample 9 processes (repulsive force and attractive force).
Driving of this device and control module comprise to be provided vertical moving and moves horizontally the driven by power of motor, the direct current supply of sensor and the demonstration of output signal.Referring to Fig. 6, the circuit part in this device is made up of direct current amplifier A1, signal comparator A2 and motor speed regulating device etc.; The characteristics of circuit are 1) magnet has the auto-reverse function of motor when contacting with superconducting sample; 2) motor speed is adjustable; The button of pressure motor counter-rotating and the switch of emergency stop are arranged when 3) appearance is unusual in the course of work; 4) output signal can external computing machine, by computing machine to the startup of motor, stop to control with rotating.Operational process is as follows: at first determine suitable translational speed by regulating electric moter voltage, press starting switch then, motor A (being the motor 301 of vertical movement mechanism among Fig. 1) drives the magnet movable stand and descends.Along with dwindling of distance between magnet and the superconducting sample, the signal of power (being the voltage signal of tension-compression sensor) is increasing.The moment that magnet contacts with superconducting sample, voltage signal surpasses predefined reference voltage value among the comparer A2, trigger A3 starts working, export a high level, make the relay J action, make motor A counter-rotating, magnet is moved by moving to be automatically changeb to away from sample towards sample, motor stops operating automatically when touching limit switch JK, returns to original state.The foregoing circuit design promptly can be protected motor and superconducting sample, can guarantee the accuracy and the continuity of measuring process again.
Work experimentation of the present invention:
Fastening or with coagulable bonding agent under the low temperature is bonding sample is fixed on the support with screw, on carriage release lever, the starter motor magnet moves down then with the magnet absorption that is fit to.Shut down when magnet contacts with superconducting sample, adjust magnet positions and make itself and superconducting sample centering, pit gauge numerical value makes zero, and makes the motor counter-rotating make magnet move to the shutdown of limit switch place away from sample then, notes the numerical value of distance between magnet and the sample.In low-temperature (low temperature) vessel, inject liquid nitrogen, make superconducting sample under zero magnetic field, be cooled to the 77K temperature.Starter motor and pen recorder move down magnet simultaneously, write down the data of power and distance simultaneously.With the gap smaller between superconducting sample and magnet, repulsive force between the two increases gradually, reaches maximal value when magnet contacts with sample.This value surpasses reference voltage value, and trigger and relay successively move, and make motor auto-reverse, make magnet move away from sample.At this moment, the repulsive force between superconducting sample and magnet reduces rapidly, reaches zero, until negative value (attractive force) occurring, is reduced to zero gradually after reaching a greatest attraction forces.
More than measure and can also carry out under the cold situation on the scene, promptly under definite distance of magnet and superconducting sample maintenance, sample is cooled having under the situation in magnetic field, other test process and null field cool off roughly the same.
Fig. 7 shows the typical suspending power being drawn by measurement mechanism of the present invention and the relation curve of levitation gap.Figure middle and upper part curve is measured when 36mm changes to zero at levitation gap, and along with the trend that repulsive force is dull rising that reduces in gap, the increasing degree of the more little power in gap is big more, has maximal value during both contacts (gap is zero).Oppositely move immediately after the contact, reduce to zero when the about 6mm along with the increase power in gap sharply descends.Continue to increase the gap, negative value (attractive force) appears in power, reduces gradually again after reaching maximal value, finally goes to zero, and obtains the curve of bottom.The relation of this magnetic buoyancy and levitation gap can be used for the design reference that the magnetic levitation engineering is used.
The invention will be further described below in conjunction with specific embodiment
Embodiment 1:
Use the device shown in Fig. 1 (a), be adsorbed on as Magnetic Field Source on the iron block of travel mechanism's screw 303 belows with the NdFeB permanent magnet 2 of diameter 26mm, a high 25mm, the magnetic induction density that this moment, the magnet lower surface recorded is approximately 0.5 tesla.The YBaCuO superconduction piece 9 of diameter 30mm, a high 18mm is fixed on the center of specimen holder 8 made of copper, and is installed in a usefulness and adds in the container 1 that the cloth bakelite processes the lined with polyethylene expanded material.This container is rigidly connected with the pull pressure sensor 4 that is fixed on the lower panel.The installation of magnet and superconducting sample should keep the upper surface of the lower surface of magnet and superconducting sample parallel.Start battery main switch, it is 30mm/ minute that the adjusting motor speed makes the translational speed of screw.The starter motor downing switch makes screw drive magnet and moves towards superconducting sample downwards, when the lower surface of magnet contacts with the upper surface of superconducting sample, and the disable motor switch.Adjust the position of magnet, make itself and superconducting sample coaxial.Simultaneously, the displacement of setting on the digital pit gauge is zero.The up switch of starter motor allows screw drive and moves to the position auto stop that travel switch is set on the magnet, and the displacement of pit gauge at this moment is shown as the distance between superconducting sample and the magnet.According to the size and the key property of sample, output signal compares the estimated value of the magnitude of voltage of circuit greater than the maximum repulsive force of sample in the setting power supply.After finishing aforesaid operations, in container, inject liquid nitrogen, make superconducting sample be cooled to liquid nitrogen temperature (77K), and keep superconducting sample to be immersed in the liquid nitrogen fully.Signal of sensor is connected to X-Y recorder, is connected to computing machine via interface simultaneously.The starter motor downing switch, magnet moves towards superconducting sample, the output signal of power increases gradually, the gap reaches the voltage that is provided with that zero back output signal has surpassed comparator circuit, the motor automatic reverse, on shut down after moving to the travel switch position.In this process, computer acquisition signal of sensor in the whole moving process is made the relation curve of Fig. 7.Getting a little the power of undergoing mutation of slope in power that computing machine draws and the gap curve and be the suspending power under the zero distance, also is the maximum magnetic flux buoyancy of material.The also omnidistance output of having noted sensor of X-Y recorder simultaneously can provide the relation curve of Fig. 3 equally.The curve of Fig. 7 middle and upper part is the relation of the repulsive force and the levitation gap of measured superconductor, is the basic data of engineering design.The size of returning the ring that stagnates that last lower curve is synthetic also is the data that engineering design must be understood.
Embodiment 2:
Use device shown in Figure 1; with same superconducting sample and magnet; after the operation in earlier stage such as fixing and position adjustment, the setting of comparative voltage, the zero-bit setting of displacement transducer etc. of finishing superconducting sample and magnet; magnet is moved on to the shutdown apart from superconducting sample 2mm place, in container, inject liquid nitrogen (field is cold).After superconducting sample was cooled to liquid nitrogen temperature, the up switch of starter motor was shut down after making magnet move to the travel switch position away from superconducting sample.The output signal of power is always negative, reduces gradually after increasing to maximal value and levels off to zero.In this process, the attractive force of Fig. 8 and the relation curve of levitation gap are made in the output of computer acquisition sensor in the whole moving process; The also omnidistance output of having noted sensor of X-Y recorder simultaneously can provide the relation curve of Fig. 8 equally.This attractive force curve also is the basic data of engineering design.
Embodiment 3:
Use device shown in Figure 2, the stainless-steel vacuum interlayer container 1 of an external diameter 100mm, internal diameter 70mm, high 80mm is installed on the jig of the pull pressure sensor 4 that is connected in the screw below the thick 4mm of container bottom.The YBaCuO superconducting sample 9 of the thick 18mm of diameter 30mm is squeezed the container bottom center that is fixed on.The magnetic induction density that is installed in the wide pure iron surface of the 10mm of the combination magnet 2 on the following table is approximately 1 tesla.The installation of magnet 2 and container 1 should keep the lower surface of superconducting sample in the container parallel with the upper surface of magnet.This container is rigidly connected with the pull pressure sensor 4 that is fixed on the following table.Before using this device for the first time, should carefully adjust the position of combination magnet, the center line vertical plane on the pure iron bar width that is positioned at its center be coincided, with the vertical plane of crossing the superconducting sample diameter so that superconducting sample is in the highfield district.Magnet positions is fixed after once adjusting, and need not later on to adjust again.Start battery main switch, it is 30mm/ minute that the adjusting motor speed makes the translational speed of screw.
The starter motor downing switch makes screw drive container and moves towards the magnet of below, disable motor switch when both contact.Simultaneously, the displacement of setting on the digital pit gauge is zero.The up switch of starter motor allows leading screw drive and moves to the position auto stop that travel switch is set on the container, and the displacement of pit gauge at this moment is shown as the distance between container bottom and the magnet.According to the size and the key property of sample, output signal compares the estimated value of the magnitude of voltage of circuit greater than the maximum repulsive force of sample in the setting power supply.After finishing aforesaid operations, in container, inject liquid nitrogen, make superconducting sample be cooled to liquid nitrogen temperature, and keep superconducting sample to be immersed in the liquid nitrogen fully.Signal of sensor is connected to X-Y recorder, is connected to computing machine via interface simultaneously.The starter motor downing switch makes container move towards the magnet of below, and the output signal of power increases gradually, and both have surpassed the voltage that is provided with of comparator circuit at the back output signal that contacts, the motor automatic reverse, on shut down after moving to the travel switch position.In this process, the output of computer acquisition sensor in the whole moving process, the treated relation curve of making similar Fig. 7;
The also omnidistance output of having noted sensor of X-Y recorder simultaneously can be done the relation curve of exerting oneself with the gap equally.The zero stand-off that different with curve among Fig. 7 is provides in measuring is meant the distance of container bottom and magnet upper surface.Because thickness of interlayer is arranged at the bottom of vacuum tank, in fact the distance between superconducting sample and the magnet should add the thickness of container bottom on the gap that measures.The container base thickness that uses in the present embodiment is 4mm, so superconducting sample and the minimum clearance between the magnet measured are 4mm.Because single block magnet is much higher than in the magnetic field of combination magnet, the repulsive force value that records under identical gap in the present embodiment is much higher than embodiment 1.
Embodiment 4:
Same device, superconducting sample and magnet among use and the embodiment 3.Container bottom injected liquid nitrogen apart from the position of magnet upper surface 3mm, makes superconducting sample be cooled to liquid nitrogen temperature in container after, the up switch of starter motor was shut down after making container move to the travel switch position away from magnet.The output signal of power is always negative, reduces gradually after increasing to maximal value and levels off to zero.In this process, the output of computer acquisition sensor in the whole moving process obtains the attractive force of similar Fig. 7 and the relation curve of levitation gap; The also omnidistance output of having noted sensor of X-Y recorder simultaneously can provide same relation curve.
Embodiment 5:
Present embodiment is the relation that adopts between hand gear measurement magnetic suspension force and the levitation gap, is suitable for the student and tests usefulness.Apparatus structure is similar to Fig. 1, and the direct current generator that the driving screw is moved up and down changes the wind of being with scale into, and remainder is identical.Use with embodiment 1 in identical superconducting sample and magnet.Experimentation is substantially the same manner as Example 1, and just the driving with motor is transformed into the rotation rocking handle, can rotate rocking handle to magnet continuously by certain speed and contact with superconducting sample, and the opposite spin rocking handle rises magnet then.The output of record sensor in this process.Also can be by certain spacing distance moving magnet (being spaced apart 2mm in the present embodiment), stop and get the data point of a power from digital voltmeter 10 seconds, draw the figure in power and gap.
Embodiment 6:
Use device shown in Figure 2, superconducting sample is identical with embodiment 3 with magnet.Container bottom is arranged on the fixed position apart from the magnet upper surface (being decided to be 3mm in the present embodiment), in container, injects liquid nitrogen, make superconducting sample be cooled to liquid nitrogen temperature.
Start the corresponding leading screw of the driven by motor that is fixed on the following table and promote the length direction transverse movement of magnet, measure the rigidity of suspending power perpendicular to the pure iron bar.Magnet also can use single magnet block.In this process, the output of computer acquisition sensor in the whole moving process, the treated relation curve of exerting oneself of doing with the superconducting sample lateral attitude; Registering instrument also can provide same relation curve.
Proving installation of the present invention is suitable for the magnetic suspension force of all kinds of oxide superconducting samples that use and measures under liquid nitrogen temperature, REBaCuO (the RE=Nd that comprises sintering, Sin, Gd, Eu, Dy, Y etc.), BiSrCaCuO, TlBaCaCuO and HgBaCuO, the REBaCuO piece of melting texture and the thick film and the film of various oxide superconducting samples.According to the range of signal of the magnetic buoyancy of tested superconducting sample, select the force cell of corresponding sensitivity.
Device of the present invention also is suitable for measuring the magnetic buoyancy between magnetic material and the magnetic material.
Low-temperature (low temperature) vessel is done corresponding improvement, make it the temperature (as liquid hydrogen or liquid helium) that can reach lower, then this device also is suitable for measuring MgB
2, NbTi and Nb
3The magnetic buoyancy of other low temperature superconducting material such as Sn.
Claims (10)
1, a kind of superconductor magnetic buoyancy measurement mechanism, comprise that one is used to support, fix the frame of each functional part, it is characterized in that described functional part includes: one puts the low-temperature (low temperature) vessel of tested superconductor, the measuring sensor of measuring the travel mechanism, power and the displacement that contain a vertical movement mechanism with magnet, at least and the driving and the control module of output signal display unit and single unit system; Described vertical movement mechanism and low-temperature (low temperature) vessel and magnet one of them person link.
2, superconductor magnetic buoyancy measurement mechanism according to claim 1, it is characterized in that: described travel mechanism also comprises a horizontal mobile mechanism.
3, superconductor magnetic buoyancy measurement mechanism according to claim 1 is characterized in that: described travel mechanism is driven by motor, manual a kind of mode.
4, superconductor magnetic buoyancy measurement mechanism according to claim 1 is characterized in that: described low-temperature (low temperature) vessel is to have the canister of vacuum interlayer or the container that textolite is processed into.。
5, superconductor magnetic buoyancy measurement mechanism according to claim 4, it is characterized in that: the container inside lining that described textolite is processed into has a polyethylene foam-material layer.
6, superconductor magnetic buoyancy measurement mechanism according to claim 4, it is characterized in that: described container is built-in with the sample fixed mount.
7, superconductor magnetic buoyancy measurement mechanism according to claim 6 is characterized in that: described sample fixed mount uses nonferromugnetic material to make, with the bottom of low-temperature (low temperature) vessel with screwed connection.
8, superconductor magnetic buoyancy measurement mechanism according to claim 1 is characterized in that: described magnet adopts to magnetize and inserts and puts the array mode of pure iron between the two horizontal magnets or adopt the cylindric and magnetizing direction short transverse along magnet.
9, a kind of method of testing of block high-temperature superconductor magnetic sample suspending power, it is characterized in that: described method step is as follows:
1) sample is fixed on the support in the block high-temperature superconductor magnetic sample suspending power measurement mechanism, with the magnet absorption that is fit on carriage release lever;
2) starter motor, magnet moves down;
Shut down when 3) magnet contacts with superconducting sample, adjust magnet positions and make itself and superconducting sample centering, pit gauge numerical value makes zero, and makes the motor counter-rotating make magnet move to the shutdown of limit switch place away from sample then;
4) note the numerical value of distance between magnet and the superconducting sample;
5) in the low-temperature (low temperature) vessel of block high-temperature superconductor magnetic sample suspending power measurement mechanism, inject liquid nitrogen, make sample under zero magnetic field, be cooled to the 77K temperature; While starter motor and pen recorder;
6) magnet is moved down, write down the data of power and distance simultaneously;
7) contact with superconducting sample to magnet, trigger and relay successively move, and motor is auto-reverse, and magnet moves away from sample, the data of record overall process power and distance.
10, the method for testing of block high-temperature superconductor magnetic sample suspending power according to claim 9 is characterized in that: described magnet drives slowly and continuously with the direct current generator of adjustable speed and moves, and translational speed is at 0.1～1.0mm/ between second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101151119A CN1275027C (en) | 2003-11-21 | 2003-11-21 | Measuring device of block high temperature superconductor magnetic suspension floating force and its testing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101151119A CN1275027C (en) | 2003-11-21 | 2003-11-21 | Measuring device of block high temperature superconductor magnetic suspension floating force and its testing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1619268A true CN1619268A (en) | 2005-05-25 |
| CN1275027C CN1275027C (en) | 2006-09-13 |
Family
ID=34760314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101151119A Expired - Lifetime CN1275027C (en) | 2003-11-21 | 2003-11-21 | Measuring device of block high temperature superconductor magnetic suspension floating force and its testing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1275027C (en) |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100445713C (en) * | 2006-11-20 | 2008-12-24 | 西南交通大学 | Testing apparatus for high temperature, superconducting, magnetic suspension and dynamic performance and testing method with the same |
| CN101813533A (en) * | 2010-03-26 | 2010-08-25 | 南京航空航天大学 | Device for testing performance of IPMC (Ionic Polymer-Metal Composite) artificial muscle material |
| CN102520378A (en) * | 2011-12-12 | 2012-06-27 | 上海大学 | Device and method for measuring magnetic flux frozen field of high-temperature superconductive single-domain bulk |
| CN102854478A (en) * | 2012-09-03 | 2013-01-02 | 西南交通大学 | Device for testing magnetic suspension characteristic of single high-temperature superconductor |
| CN103176145A (en) * | 2011-12-20 | 2013-06-26 | 北京有色金属研究总院 | Device and method for measuring trapped magnetic field of block high temperature superconductor |
| CN103900739A (en) * | 2012-12-28 | 2014-07-02 | 北京有色金属研究总院 | Device and method for measuring large-grain block high-temperature superconductor and combination magnetic buoyancy of large-grain block high-temperature superconductor |
| CN103901366A (en) * | 2012-12-28 | 2014-07-02 | 北京有色金属研究总院 | Device and method for measuring large-grain block high-temperature superconductor and combination trapped magnetic field of large-grain block high-temperature superconductor |
| CN104180750A (en) * | 2014-07-07 | 2014-12-03 | 西安交通大学 | Accurate tester of superconductive-bulk magnetic-repulsion under micro gap and test method thereof |
| CN105300567A (en) * | 2015-09-23 | 2016-02-03 | 西南交通大学 | High-gradient high-intensity magnetic field magnetic suspension characteristic test technology |
| CN105372608A (en) * | 2015-12-23 | 2016-03-02 | 西南交通大学 | Device for testing magnetic levitation characteristics of high-temperature superconducting coil in variable high magnetic field |
| CN105810384A (en) * | 2014-12-30 | 2016-07-27 | 北京有色金属研究总院 | Magnetizing method used for high-temperature bulk superconductor |
| CN108036884A (en) * | 2018-01-03 | 2018-05-15 | 安徽中腾汽车零部件有限公司 | A kind of detection device for testing the distribution of automobile Frameless windshield wiper steel disc pressure |
| CN110243527A (en) * | 2019-07-08 | 2019-09-17 | 上海微小卫星工程中心 | A kind of contactless measurement of multiple degrees of freedom field force |
| CN110567627A (en) * | 2019-10-25 | 2019-12-13 | 中国科学技术大学 | Device and method for measuring suspension force of ultrasonic suspension device |
| CN110658483A (en) * | 2019-11-05 | 2020-01-07 | 西南交通大学 | Device and method for testing interaction force of high-temperature superconductor and permanent magnet |
| CN110657907A (en) * | 2019-08-19 | 2020-01-07 | 北京航空航天大学 | High-bearing low-loss inertia type superconducting magnetic suspension micro force measuring device |
| CN113746258A (en) * | 2021-07-31 | 2021-12-03 | 苏州百狮腾电气有限公司 | Magnetic suspension motor for testing by connecting electromagnetic wire |
| CN113899535A (en) * | 2021-08-26 | 2022-01-07 | 北京机械设备研究所 | Device and method for testing support characteristics of high-temperature superconducting suspension type flywheel rotor |
| CN114966494A (en) * | 2022-05-23 | 2022-08-30 | 西南交通大学 | Multi-magnetic-levitation-system measuring device based on magnetic-thermal-force multi-field coupling and measuring method thereof |
| JP7268922B1 (en) | 2021-10-27 | 2023-05-08 | 西南交通大学 | Magnetic levitation railway running state simulator and its simulation method |
-
2003
- 2003-11-21 CN CNB2003101151119A patent/CN1275027C/en not_active Expired - Lifetime
Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100445713C (en) * | 2006-11-20 | 2008-12-24 | 西南交通大学 | Testing apparatus for high temperature, superconducting, magnetic suspension and dynamic performance and testing method with the same |
| CN101813533A (en) * | 2010-03-26 | 2010-08-25 | 南京航空航天大学 | Device for testing performance of IPMC (Ionic Polymer-Metal Composite) artificial muscle material |
| CN101813533B (en) * | 2010-03-26 | 2012-03-21 | 南京航空航天大学 | Device for testing performance of IPMC (Ionic Polymer-Metal Composite) artificial muscle material |
| CN102520378A (en) * | 2011-12-12 | 2012-06-27 | 上海大学 | Device and method for measuring magnetic flux frozen field of high-temperature superconductive single-domain bulk |
| CN103176145B (en) * | 2011-12-20 | 2015-11-18 | 北京有色金属研究总院 | Block high-temperature superconductor Trapped field measurement mechanism and method |
| CN103176145A (en) * | 2011-12-20 | 2013-06-26 | 北京有色金属研究总院 | Device and method for measuring trapped magnetic field of block high temperature superconductor |
| CN102854478A (en) * | 2012-09-03 | 2013-01-02 | 西南交通大学 | Device for testing magnetic suspension characteristic of single high-temperature superconductor |
| CN102854478B (en) * | 2012-09-03 | 2015-05-20 | 西南交通大学 | Device for testing magnetic suspension characteristic of single high-temperature superconductor |
| CN103900739A (en) * | 2012-12-28 | 2014-07-02 | 北京有色金属研究总院 | Device and method for measuring large-grain block high-temperature superconductor and combination magnetic buoyancy of large-grain block high-temperature superconductor |
| CN103901366A (en) * | 2012-12-28 | 2014-07-02 | 北京有色金属研究总院 | Device and method for measuring large-grain block high-temperature superconductor and combination trapped magnetic field of large-grain block high-temperature superconductor |
| CN104180750B (en) * | 2014-07-07 | 2017-04-26 | 西安交通大学 | Accurate tester of superconductive-bulk magnetic-repulsion under micro gap and test method thereof |
| CN104180750A (en) * | 2014-07-07 | 2014-12-03 | 西安交通大学 | Accurate tester of superconductive-bulk magnetic-repulsion under micro gap and test method thereof |
| CN105810384A (en) * | 2014-12-30 | 2016-07-27 | 北京有色金属研究总院 | Magnetizing method used for high-temperature bulk superconductor |
| CN105810384B (en) * | 2014-12-30 | 2018-02-23 | 北京有色金属研究总院 | A kind of magnetization method for high-temperature superconducting block |
| CN105300567A (en) * | 2015-09-23 | 2016-02-03 | 西南交通大学 | High-gradient high-intensity magnetic field magnetic suspension characteristic test technology |
| CN105372608A (en) * | 2015-12-23 | 2016-03-02 | 西南交通大学 | Device for testing magnetic levitation characteristics of high-temperature superconducting coil in variable high magnetic field |
| CN108036884A (en) * | 2018-01-03 | 2018-05-15 | 安徽中腾汽车零部件有限公司 | A kind of detection device for testing the distribution of automobile Frameless windshield wiper steel disc pressure |
| CN110243527A (en) * | 2019-07-08 | 2019-09-17 | 上海微小卫星工程中心 | A kind of contactless measurement of multiple degrees of freedom field force |
| WO2021031799A1 (en) * | 2019-08-19 | 2021-02-25 | 北京航空航天大学 | High-load and low-loss inertial superconducting magnetic suspension micro-force measurement device |
| CN110657907A (en) * | 2019-08-19 | 2020-01-07 | 北京航空航天大学 | High-bearing low-loss inertia type superconducting magnetic suspension micro force measuring device |
| CN110657907B (en) * | 2019-08-19 | 2020-06-26 | 北京航空航天大学 | High-bearing low-loss inertia type superconducting magnetic suspension micro force measuring device |
| CN110567627A (en) * | 2019-10-25 | 2019-12-13 | 中国科学技术大学 | Device and method for measuring suspension force of ultrasonic suspension device |
| CN110658483A (en) * | 2019-11-05 | 2020-01-07 | 西南交通大学 | Device and method for testing interaction force of high-temperature superconductor and permanent magnet |
| CN113746258A (en) * | 2021-07-31 | 2021-12-03 | 苏州百狮腾电气有限公司 | Magnetic suspension motor for testing by connecting electromagnetic wire |
| CN113746258B (en) * | 2021-07-31 | 2023-09-01 | 苏州百狮腾电气有限公司 | Magnetic levitation motor for testing by electromagnetic wire connection wire |
| CN113899535A (en) * | 2021-08-26 | 2022-01-07 | 北京机械设备研究所 | Device and method for testing support characteristics of high-temperature superconducting suspension type flywheel rotor |
| JP7268922B1 (en) | 2021-10-27 | 2023-05-08 | 西南交通大学 | Magnetic levitation railway running state simulator and its simulation method |
| JP2023067682A (en) * | 2021-10-27 | 2023-05-16 | 西南交通大学 | Apparatus for simulating traveling state of magnetic levitation type train and method therefor |
| CN114966494A (en) * | 2022-05-23 | 2022-08-30 | 西南交通大学 | Multi-magnetic-levitation-system measuring device based on magnetic-thermal-force multi-field coupling and measuring method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1275027C (en) | 2006-09-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1275027C (en) | Measuring device of block high temperature superconductor magnetic suspension floating force and its testing method | |
| CN100360952C (en) | Testing device for magnetic field and magnetic force in three-dimensional space | |
| CN101191748B (en) | High temperature superconduction magnetic levitation or electric machine quasi-static force test device | |
| CN101571575B (en) | Test device for capture magnetic field of high-temperature superconducting block and test method thereof | |
| Wang et al. | An update high-temperature superconducting maglev measurement system | |
| CN100495063C (en) | Testing device of magnetic suspension of high-temperature superconductor, and testing method for using the device | |
| CN104180750B (en) | Accurate tester of superconductive-bulk magnetic-repulsion under micro gap and test method thereof | |
| CN106568537A (en) | Electromagnet suction measuring device | |
| CN105738680A (en) | Test apparatus and test method for anisotropy of high temperature superconducting belt material under tension | |
| CN2658732Y (en) | Super conductive material magnetic floating buoyancy measuring device | |
| Deng et al. | Levitation performance of rectangular bulk superconductor arrays above applied permanent-magnet guideways | |
| Wang et al. | Laboratory-scale high temperature superconducting Maglev launch system | |
| CN1141560C (en) | High-temperature superconductive magnetic levitation testing technology | |
| CN113109747B (en) | Superconducting magnetic suspension micro-suspension force rapid testing device and testing method | |
| Liu et al. | Strong magnetic field dependence of micro-YBCO superconductor levitated above Halbach guideway | |
| CN202533569U (en) | A trapped field measuring device of a block-shaped high-temperature superconductor | |
| Postrekhin et al. | Dynamics and relaxation of magnetic stress between magnet and superconductor in a levitation system | |
| Lin et al. | Dynamic characteristics of levitated YBCO bulk running above the permanent magnet guideway with fluctuating magnetic field | |
| CN103176145B (en) | Block high-temperature superconductor Trapped field measurement mechanism and method | |
| CN208873569U (en) | A kind of floating Dewar of high-temperature superconductor magnetic | |
| Weeks | A torsion balance to measure hysteretic levitation forces in high T c superconductors | |
| CN220690452U (en) | Magnetic suspension radial magnetic bearing magnetic force testing device | |
| CN220853432U (en) | Slider test platform is used in production of machinery guide rail | |
| CN210982320U (en) | Iron content detection device for iron tailing asphalt mixture | |
| Hekmati et al. | STRUCTURES FOR HIGH TEMPERATURE SUPERCONDUCTING MAGNETIC BEARINGS |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190628 Address after: 101407 No. 11 Xingke East Street, Yanqi Economic Development Zone, Huairou District, Beijing Patentee after: YOUYAN ENGINEERING TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. Address before: 100088, 2, Xinjie street, Beijing Patentee before: General Research Institute for Nonferrous Metals |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20060913 |