CN109916995B - Runway type background magnet for superconducting strip test - Google Patents
Runway type background magnet for superconducting strip test Download PDFInfo
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- CN109916995B CN109916995B CN201811579810.1A CN201811579810A CN109916995B CN 109916995 B CN109916995 B CN 109916995B CN 201811579810 A CN201811579810 A CN 201811579810A CN 109916995 B CN109916995 B CN 109916995B
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Abstract
A runway type background magnet for superconducting strip testing belongs to the technical field of superconducting material detection. The device assembles a middle magnetic field generation area frame (5), left and right side runway type coils (3, 4), left and right side fixing plates (1, 2) into a whole through a first to fourth threaded rods and nuts, and a strip clamp and a strip assembly body (12) are arranged in a strip magnetic field channel (15) and sealed; runway-shaped positioning grooves are arranged on the middle magnetic field generation area frame and the left and right side fixing plates; the current is introduced to generate a uniform strong magnetic field in the intermediate magnetic field generation area. The top plate (7) is provided with a rectangular tooth groove with a circumferential array, and the top strip clamp fixing disc (8) and the bottom strip clamp fixing disc (11) are connected with the strip clamp and the strip assembly body. The angle between the high-temperature superconducting strip (14) and the background magnetic field is changed by changing the matching of the left and right fixed angle teeth (21-1, 21-2) and the rectangular tooth socket, so that the anisotropy of the strip is conveniently measured.
Description
Technical Field
The invention belongs to the technical field of superconducting material detection, and relates to a device for measuring characteristic parameters of a superconducting strip in a background magnetic field.
Background
The superconducting material and the application thereof are one of the most rapid high-tech fields which have been developed at home and abroad since the 21 st century, and the superconductor has the advantages of zero resistance, low loss, high electromagnetic density, environmental friendliness and the like, and has great significance for improving the energy efficiency of electromagnetic equipment, improving the running performance and the running magnetic field, energy and power density.
High-temperature superconducting materials often work in complex electromagnetic environments, and external magnetic fields have great influence on the characteristics of critical current, alternating current loss and the like. When a superconductor transmits alternating current or is in an alternating magnetic field, the alternating current loss generated in the superconductor is directly related to the design, manufacture and application of high-temperature superconducting power equipment. The measurement of the alternating current loss of the high-temperature superconducting strip under a back field, the research on the alternating current loss generation mechanism, the anisotropy, the volt-ampere characteristic, the frequency dependence of critical current and the like of the high-temperature superconducting material are facilitated, the realization of the low-loss and high-current superconducting material is facilitated, and the method has great significance on the application and development of the superconducting power technology.
Background magnets used today to generate back fields are mainly conventional circular helmholtz coils. A uniform magnetic field in a small range is generated in the middle of the axis between the two coils, and other spatial positions cannot be regarded as uniform magnetic fields. Aiming at the tested sample with longer length of the high-temperature superconducting strip, the radius of the coil required by the traditional circular Helmholtz coil is larger, the number of turns is more, the size and the weight of the device are increased, and the manufacturing cost of the coil, the framework and the like is increased. The uniformity and amplitude of the magnetic field can be reduced and cannot meet the measurement requirements, the alternating current loss of the high-temperature superconducting tape can be increased to a certain extent when the magnetic fields in different directions act on the high-temperature superconducting tape, and the change condition of the alternating current loss of the superconducting tape under different magnetic field strengths and directions can not be accurately measured.
The existing testing device is not provided with an angle changing part, the strip is positioned at a fixed position in a magnetic field, the included angle between the strip and the magnetic field cannot be changed, and the anisotropy of the high-temperature superconducting strip cannot be measured.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a runway type background magnet for superconducting tape test.
The technical scheme of the invention is as follows: a runway type background magnet for superconducting strip material test is provided, which is characterized in that copper wires are respectively wound on a left side coil framework and a right side coil framework to form a left side runway type coil and a right side runway type coil; one end of the left coil framework and one end of the right coil framework are respectively assembled in a first runway-shaped positioning groove and a second runway-shaped positioning groove of the middle magnetic field generation area framework; the other ends of the left side coil framework and the right side coil framework are respectively assembled in the track-shaped positioning grooves of the left side fixing plate and the right side fixing plate;
a leading-out wire at one end of the left runway type coil is led out from a first wire outlet of the left fixing plate; a lead-out wire at the other end of the left runway type coil is led out from a second outlet of the left fixing plate;
a lead-out wire at one end of the right runway type coil is led out from a third wire outlet of the right fixing plate; a lead-out wire at the other end of the right runway type coil is led out from a fourth wire outlet of the right fixing plate;
the first to fourth threaded rods respectively pass through the first to fourth left side plate fixing holes and the first to fourth right side plate fixing holes, and are screwed tightly at two ends of each threaded rod by nuts, so that the middle magnetic field generation area frame, the left side runway type coil, the right side runway type coil, the left side fixing plate and the right side fixing plate are built to form an assembly body with a compact structure;
the top plate and the middle magnetic field generation area frame are fixedly connected with a first threaded hole of the frame through a bolt penetrating through a first through hole of the top plate;
the bottom plate and the intermediate magnetic field generation area frame are fixedly connected with the second threaded hole of the frame through a bolt penetrating through the first through hole of the bottom plate;
the top plate is in screw connection with the left side fixing plate and the right side fixing plate through bolts penetrating through the second through hole and the third through hole of the top plate, the first threaded hole of the left side fixing plate and the third threaded hole of the right side fixing plate;
the bottom plate is in screw connection with the left side fixing plate and the right side fixing plate through bolts penetrating through the second fixing through hole and the third fixing through hole of the bottom plate, the second threaded hole of the left side fixing plate and the fourth threaded hole of the right side fixing plate;
the two ends of the strip clamp and the strip assembly body respectively penetrate through the central circular hole of the top plate and the central circular hole of the bottom plate, and the strip clamp and the strip assembly body are placed in the strip magnetic field channel; inserting a top strip clamp fixing disc and a bottom strip clamp fixing disc into a top plate central circular hole and a bottom plate central circular hole from two ends of a strip clamp and strip assembly body respectively, so that the strip clamp and the strip assembly body are clamped in a top strip clamp fixing frame and a bottom strip clamp fixing frame; placing the angle fixing left wing and the angle fixing right wing of the top strip clamp fixing disc in the first rectangular tooth groove and the second rectangular tooth groove or the nineteenth rectangular tooth groove and the twentieth rectangular tooth groove as initial positions;
then inserting a strip channel sealing plate into the opening of the frame of the intermediate magnetic field generation area; meanwhile, the first and second voltage leads are led out through the voltage lead holes.
The left side fixing plate and the right side fixing plate are in a symmetrical state, and are respectively provided with a left side fixing plate runway-shaped positioning groove and a right side fixing plate runway-shaped positioning groove, and the sizes of the left side fixing plate runway-shaped positioning grooves and the right side fixing plate runway-shaped positioning grooves are completely the same as the shapes of the runway-shaped cross sections of the left side coil framework and the right side coil framework; a first copper wire outlet, a second copper wire outlet, a third copper wire outlet and a fourth copper wire outlet are respectively arranged at the joint part of the curve and the straight track of the track-shaped positioning groove of the left fixing plate and the right fixing plate, and the distance is the same as the thickness of the coil.
The assembly body of the strip clamp and the strip comprises the strip clamp, a first T-shaped copper sheet, a second T-shaped copper sheet, a high-temperature superconducting strip, a first voltage lead and a second voltage lead; the first T-shaped copper sheet and the second T-shaped copper sheet are embedded at two ends of the strip clamp, and a first conduction cable threaded hole and a second conduction cable threaded hole are respectively formed in the transverse edges of the T shape; the high-temperature superconducting tape is placed in the central rectangular area of the tape clamp, a first tape pressing material copper sheet and a second tape pressing material copper sheet are respectively placed at two ends of the tape clamp, and the high-temperature superconducting tape is fixed in the central rectangular area of the tape clamp by respectively penetrating through holes at two ends of the first tape pressing material copper sheet and the second tape pressing material copper sheet and a first fixing bolt channel, a second fixing bolt channel, a third fixing bolt channel, a fourth fixing bolt channel and a nut through screws; one end of each of the first voltage lead and the second voltage lead is welded in the middle of the high-temperature superconducting strip respectively, the interval between the two welding points is 10-15 mm, and the two welding points are twisted into a strand by an 8-shaped winding method and led out through the voltage lead hole.
The top plate is provided with a top plate central circular hole, the circumference of the top plate is provided with first to twenty-fourth rectangular tooth grooves, two rectangular tooth grooves on the same diameter form a group, each group is separated by 10 degrees, and the first rectangular tooth groove c1 and the nineteenth rectangular tooth groove c19 are separated by 90 degrees, and the second rectangular tooth groove c2 and the twentieth rectangular tooth groove c20 are separated by 90 degrees;
the two sides of the top strip clamp fixing disc are respectively extended to form an angle fixing left tooth and an angle fixing right tooth, the central lines of the two teeth are on the same diameter, the shape and the size of the two teeth are completely the same as those of the first to the twentieth rectangular tooth grooves, and the two teeth are matched with each other.
Compared with the prior art, the invention has the following beneficial effects: the runway type Helmholtz coil of the device can generate a longer uniform magnetic field with higher uniformity at a straight passage part, so that the long superconducting strip is in a magnetic field with a specific direction and a specific size. The current introduced into the coil is changed, so that the intensity of the external field magnetic field can be changed, and the uniformity of the magnetic field cannot be reduced. The influence of different external field magnetic field strengths on the alternating current loss of the superconducting tape is measured and researched. And for the traditional background magnet, the device is additionally provided with an angle conversion part, so that the alternating current loss measurement function can be realized under the condition that the included angles of the high-temperature superconducting strip and the magnetic field are different, and the anisotropy of the high-temperature superconducting strip is researched. The method provides more reliable experimental basis for the design and application of the high-temperature superconducting device wound by a plurality of strips. The required coil radius of runway type helmholtz coil is littleer, the number of turns is still less, reduces device volume, weight, reduces the cost of manufacture.
Drawings
FIG. 1 is a schematic perspective view of a measuring device according to the present invention;
FIG. 2 is a front view of the measuring device of the present invention;
FIG. 3 is a left side view of the measuring device of the present invention;
FIG. 4 is a right side view of the measuring device of the present invention
FIG. 5 is a top view of a measuring device of the present invention;
FIG. 6 is a bottom view of the measuring device of the present invention;
FIG. 7 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 8 is a front view of a frame of the intermediate magnetic field generation region;
FIG. 9 is a top view of the frame of the intermediate magnetic field generating region;
FIG. 10 is a bottom view of the intermediate magnetic field generating zone frame;
FIG. 11 is a cross-sectional view B-B of FIG. 9;
FIG. 12 is a left side view of the frame of the middle magnetic field generation region;
FIG. 13 is a right side view of the frame of the intermediate magnetic field generating region;
fig. 14 is a perspective view of a strip passage closure plate;
FIG. 15 is a front view of the left securing plate structure;
FIG. 16 is a cross-sectional view C-C of FIG. 15;
FIG. 17 is a top view of the left fixation plate;
fig. 18 is a bottom view of the left side fixing plate;
FIG. 19 is a front view of the right securing plate structure;
FIG. 20 is a cross-sectional view D-D of FIG. 19;
FIG. 21 is a top view of the right fixation plate;
fig. 22 is a bottom view of the right side fixing plate;
FIG. 23 is a front view of the tape clamp and the high temperature superconducting tape assembly;
FIG. 24 is a plan view of the tape clamp and the high temperature superconducting tape assembly;
FIG. 25 is a cross-sectional view of X1-X1 of FIG. 24
FIG. 26 is a cross-sectional view of X2-X2 of FIG. 24
FIG. 27 is a schematic three-dimensional view of a tape clip and T-shaped copper sheet assembly
FIG. 28 is a perspective view of a first T-shaped copper sheet;
FIG. 29 is a front view of the tape clip and T-shaped copper sheet assembly;
FIG. 30 is a cross-sectional view taken along line E-E of FIG. 29;
FIG. 31 is a front view of the top plate construction;
FIG. 32 is a sectional view taken along line F-F of FIG. 31
FIG. 33 is a perspective view of the top strap clamp securing plate;
FIG. 34 is a front view of the floor structure;
FIG. 35 is a sectional view taken along line G-G of FIG. 34
Fig. 36 is a perspective view of the bottom strap clamp securing disk.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The superconducting tape test uses a racetrack type background magnet, as shown in FIGS. 1 to 34.
The device includes: a left side fixing plate 1, a left side fixing plate runway type positioning groove 1-1, a right side fixing plate 2, a right side fixing plate runway type positioning groove 2-1, a left side runway type coil 3, a right side runway type coil 4, a middle magnetic field generation area frame 5, a strip clamp 6, a top plate 7, a top strip clamp fixing disc 8, a first T-shaped copper sheet 9-1, a second T-shaped copper sheet 9-2, a bottom plate 10, a bottom strip clamp fixing disc 11, a strip clamp and strip assembly 12, a left side fixing plate first outlet 13-1, a left side fixing plate second outlet 13-2, a right side fixing plate first outlet 13-3, a right side fixing plate second outlet 13-4, a high temperature superconducting strip 14, a strip magnetic field channel 15, a left side coil framework 16, a right side coil framework 17, a first fixing bolt channel 18-1, a second fixing bolt channel 18-2, a third fixing bolt channel 18-3, a fourth fixing bolt channel 18-4, a strip channel sealing plate 19, a voltage lead hole 20, an angle fixing left tooth 21-1, an angle fixing right tooth 21-2, a top strip fixing frame 22, a frame first screw hole 23-1, a frame second fixing screw hole 23-2, a first runway type positioning groove 24-1, a second runway type positioning groove 24-2, a first strip pressing material copper sheet 25-1, a second strip pressing material copper sheet 25-2, a bottom strip fixing frame 26, a first electrifying cable screw hole 27-1, a second electrifying cable screw hole 27-2, a first left board fixing hole 28-1, a second left board fixing hole 28-2 and a third left board fixing hole 28-3, a fourth left side plate fixing hole 28-4, a top plate first through hole 29-1, a top plate second through hole 29-2, a top plate third through hole 29-3, a bottom plate first through hole 30-1, a bottom plate second through hole 30-2, a bottom plate third through hole 30-3, a top plate central circular hole 31, a bottom plate central circular hole 32, a first threaded rod 33-1, a second threaded rod 33-2, a third threaded rod 33-3, a fourth threaded rod 33-4, a first right side plate fixing hole 38-1, a second right side plate fixing hole 38-2, a third right side plate fixing hole 38-3, a fourth right side plate fixing hole 38-4, a left side fixing plate first threaded hole 39-1, a left side fixing plate second threaded hole 39-2, a right side fixing plate third threaded hole 39-3, fourth screw holes 39-4 of the right fixing plate, first voltage leads 40-1, second voltage leads 40-2, first rectangular slot c1, second rectangular slot c2, third rectangular slot c3, fourth rectangular slot c4, fifth rectangular slot c5, sixth rectangular slot c6, seventh rectangular slot c7, eighth rectangular slot c8, ninth rectangular slot c9, tenth rectangular slot c10, eleventh rectangular slot c11, twelfth rectangular slot c12, thirteenth rectangular slot c13, fourteenth rectangular slot c14, fifteenth rectangular slot c15, sixteenth rectangular slot c16, seventeenth rectangular slot c17, eighteenth rectangular slot c18, nineteenth rectangular slot c19, and twenty rectangular slot c20, and the connection between the components is as follows:
winding copper wires on the left and right coil frames 16 and 17 respectively to form left and right runway type coils 3 and 4; one end of each of the left and right coil frameworks 16 and 17 is respectively assembled in a first runway-type positioning groove 24-1 and a second runway-type positioning groove 24-2 of the middle magnetic field generation area framework; the other ends of the left and right coil frameworks 16 and 17 are respectively assembled at the left and right fixed plate runway-shaped positioning grooves 1-1 and 2-1.
A leading-out wire at one end of the left runway type coil 3 is led out from a first wire outlet 13-1 of the left fixing plate; and a leading-out wire at the other end of the left runway type coil 3 is led out from a second wire outlet 13-2 of the left fixing plate.
A leading-out wire at one end of the right runway type coil 4 is led out from a third wire outlet 13-3 of the right fixing plate; and a leading-out wire at the other end of the right runway type coil 4 is led out from a fourth wire outlet 13-4 of the right fixing plate.
The first to fourth threaded rods 33-1, 33-2, 33-3 and 33-4 respectively pass through the first to fourth left side plate fixing holes 28-1, 28-2, 28-3 and 28-4 and the first to fourth right side plate fixing holes 38-1, 38-2, 38-3 and 38-4, and then are screwed down at two ends of each threaded rod by nuts, so that the middle magnetic field generation area frame 5, the left runway type coil 3, the right runway type coil 4, the left fixing plate 1 and the right fixing plate 2 form an assembly body with a compact structure.
The top plate 7, fig. 31, and the intermediate magnetic field generation region frame 5, fig. 8, 9, 10, 11, 12, 13 are fixedly connected with the frame first threaded hole 23-1 by a bolt passing through the top plate first through hole 29-1.
The bottom plate 10, see fig. 33, is fixedly connected with the intermediate magnetic field generation zone frame 5 through bolts passing through the bottom plate first through holes 30-1 and the frame second threaded holes 23-2.
The top plate 7 is in screw connection with the left side fixing plate 1, see fig. 15-18, the right side fixing plate 2, see fig. 19-22, and the first threaded hole 39-1 of the left side fixing plate and the third threaded hole 39-3 of the right side fixing plate through the second through hole 29-2 and the third through hole 29-3 of the top plate by bolts.
The bottom plate 10 and the left and right fixing plates 1 and 2 are in screw connection with a second screw hole 39-2 of the left fixing plate and a fourth screw hole 39-4 of the right fixing plate through bolts passing through the second and third fixing through holes 30-2 and 30-3 of the bottom plate.
The strip clamp and strip assembly 12, see fig. 23 and 24, has two ends respectively passing through the top plate central circular hole 31 and the bottom plate central circular hole 32, and is placed in the strip magnetic field channel 15; then inserting the top strip clamp fixing disc 8 and the bottom strip clamp fixing disc 11 into the top plate central circular hole 31 and the bottom plate central circular hole 32 from the two ends of the strip clamp and strip assembly body 12 respectively, so that the strip clamp and strip assembly body 12 are clamped in the top strip clamp fixing frame 22 and the bottom strip clamp fixing frame 26; the angle fixing left wing 21-1 and the angle fixing right wing 21-2 of the top tape clip fixing disc 8 are placed in the first and second rectangular tooth grooves c1, c2 or the nineteenth and twentieth rectangular tooth grooves c19, c20 as initial positions. The top strip clamp fixing disc 8 and the bottom strip clamp fixing disc 11 are respectively provided with two same through holes to assist the rotation of the strip clamp and the strip assembly body 12.
Then, a strip channel closing plate 19, see fig. 14, is inserted into the opening of the frame 5 of the intermediate magnetic field generation region; meanwhile, the first and second voltage leads 40-1 and 40-2 are led out through the voltage lead hole 20.
The left fixing plate 1 and the right fixing plate 2 are in a symmetrical state, the left fixing plate 1 and the right fixing plate 2 are respectively provided with a left fixing plate runway-type positioning groove 1-1 and a right fixing plate runway-type positioning groove 2-1, and the sizes of the left fixing plate runway-type positioning grooves and the right fixing plate runway-type positioning grooves are completely the same as the runway-type cross sections of the left coil framework 16 and the right coil framework 17; the joint parts of the bent and straight tracks of the track-type positioning grooves 1-1 and 2-1 of the left and right fixed plates are respectively provided with a first copper wire outlet 13-1 and a second copper wire outlet 13-2, a third copper wire outlet 13-3 and a fourth copper wire outlet 13-4, and the distance between the first copper wire outlet and the fourth copper wire outlet is equal to the thickness of the coil.
The strip clamp and strip assembly 12 comprises: the device comprises a strip clamp 6, a first T-shaped copper sheet 9-1, a second T-shaped copper sheet 9-2, a high-temperature superconducting strip 14, a first voltage lead 40-1 and a second voltage lead 40-2; the first T-shaped copper sheets 9-1 and the second T-shaped copper sheets 9-2 are embedded at two ends of the strip clamp 6, and a first electrified cable threaded hole 27-1 and a second electrified cable threaded hole 27-2 are respectively arranged on the transverse edges of the T shape; the high-temperature superconducting tape 14 is placed in the central rectangular area of the tape clamp 6, the first and second tape pressing material copper sheets 25-1 and 25-2 are respectively placed at two ends of the high-temperature superconducting tape 14, and the high-temperature superconducting tape 14 is fixed in the central rectangular area of the tape clamp 6 by respectively passing through holes at two ends of the first and second tape pressing material copper sheets 25-1 and 25-2 and connecting the first to fourth fixing bolt channels 18-1, 18-2, 18-3 and 18-4 with nuts through screws; one end of each of the first and second voltage leads 40-1 and 40-2 is respectively welded at a position within the plane of the high-temperature superconducting tape 14, which is away from the center by a distance greater than three times of the half width of the tape, and is twisted into a strand to be led out through the voltage lead hole 20; the first T-shaped copper sheet 9-1 and the second T-shaped copper sheet 9-2 have the same structure; the first and second press belt material copper sheets 25-1 and 25-2 have the same structure.
The top plate 7 is provided with a top plate central circular hole 31, the circumference of the top plate central circular hole is provided with first to twenty-fourth rectangular tooth grooves c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19 and c20, two rectangular tooth grooves on the same diameter are in one group, the distance between each group is 10 degrees, and the distance between the first rectangular tooth groove c1 and the nineteenth rectangular tooth groove c19, and the distance between the second rectangular tooth groove c2 and the twentieth rectangular tooth groove c20 are 90 degrees;
the two sides of the top strip clamp fixing disc 8 respectively extend out of an angle fixing left tooth 21-1 and an angle fixing right tooth 21-2, the center lines of the two teeth are on the same diameter, and the shape and the size of the two teeth are completely the same as those of first to twenty-second rectangular tooth grooves c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19 and c20, and the two teeth are matched with each other.
The left side fixed plate 1, the right side fixed plate 2, the middle magnetic field generation area frame 5, the strip clamp 6, the top plate 7, the top strip clamp fixing disc 8, the bottom plate 10, the bottom strip clamp fixing disc 11, the left side coil framework 16, the right side coil framework 17, the strip channel sealing plate 19, the first threaded rod 33-1, the second threaded rod 33-2, the third threaded rod 33-3, the fourth threaded rod 33-4, the screw and the nut are all made of polytetrafluoroethylene insulating materials.
The magnetic field intensity in the strip magnetic field channel 15 required by experimental measurement is 100 mT-200 mT, and the magnetic field uniformity reaches more than 97%, so that the diameter of the curve of the coil, the length of the straight line, the number of coil layers, the number of turns of each layer and the diameter of the copper wire are determined.
Before the experiment, the copper wire led out from the second outlet 13-2 of the left fixing plate is connected with the copper wire led out from the second outlet 13-4 of the right fixing plate, and the left runway-type coil 3 and the right runway-type coil 4 are connected in series; copper wires led out from the first appearance port 13-1 of the left side fixing plate and the second appearance port 13-3 of the right side fixing plate are respectively connected with the anode and the cathode of a programmable control direct current power supply to simultaneously provide electric energy for the left side runway type coil 3 and the right side runway type coil 4, so that the currents passing through the left side runway type coil and the right side runway type coil are the same, and the magnitude and the direction of the generated magnetic field are the same. The high-temperature superconducting tape 14 is connected with the lock-in amplifier through the first electrifying cable threaded hole 27-1 and the second electrifying cable threaded hole 27-2. The output signal of the phase-locked amplifier is small, so that a power amplifier and a voltage reduction amplifier are added in the measuring process, and the current is increased to 250A at most to meet the test requirement. The lead of the Rogowski coil is connected to the channel A of the phase-locked amplifier, and the first voltage lead 40-1 and the second voltage lead 40-2 are connected to the channel B. The acquisition of the two-way voltage is realized by switching the phase lock back and forth in the A, B two-way channel. The resistive voltage signal V of the high temperature superconducting tape 14 is measured by a lock-in amplifier, and the magnitude of the transmission current I is measured by a rogowski coil.
In the experiment, the device is arranged in a low-temperature resistant container, the high-temperature superconducting strip 14 is adjusted to the first and second rectangular tooth grooves c1 and c2 at the initial positions, then liquid nitrogen is slowly introduced until the device is completely soaked in the liquid nitrogen, and the device is continuously cooled for 10-15 min. And a programmable control direct current power supply is switched on to supply power to the runway type coils on the left side and the right side. And the phase-locked amplifier, the power amplifier and the voltage-reducing transformer are switched on to supply power to the high-temperature superconducting strip. The ac loss of the high-temperature superconducting tape 14 in the initial state is calculated from Q ═ IV by the voltage parameter measured by the lock-in amplifier and the transmission current parameter measured by the rogowski coil.
The left tooth 21-1 with the fixed angle and the right tooth 21-2 with the fixed angle are placed into the third rectangular tooth socket c3 and the fourth rectangular tooth socket c4, namely, the high-temperature superconducting strip 14 rotates 10 degrees in a magnetic field, the voltage and current parameters at the moment are measured, and the alternating current loss in the current state is calculated; then, the angle-fixed left tooth 21-1 and the angle-fixed right tooth 21-2 are placed into the fifth and sixth rectangular tooth grooves c5 and c6, namely, the high-temperature superconducting tape 14 rotates 20 degrees in a magnetic field, the voltage and current parameters at the moment are measured, and the alternating current loss is calculated; similarly, the ac loss of the high-temperature superconducting tape 14 at 0 ° to 90 ° can be calculated.
The anisotropy of the high-temperature superconducting tape under different currents can be measured by changing the transmission current of the high-temperature superconducting tape and repeating the experimental steps.
The Hall element is arranged in the center of the high-temperature superconducting strip 14, and the magnetic field of the high-temperature superconducting strip 14 is calculated by measuring the voltage of the Hall element and utilizing a corresponding formula. By changing the current of the programmable control direct current power supply which is led into the left-side and right-side runway type coils 3 and 4, changing the amplitude of the magnetic field and utilizing the Hall element to measure, the measurement research can be carried out on the alternating current loss characteristic change of the high-temperature superconducting strip 14 under different back fields.
The device can measure the high-temperature superconducting strip 14: when the transmission current and the external magnetic field intensity are not changed, the alternating current loss under different magnetic field angles is changed; under the condition of the magnitude of transmission current and a certain magnetic field angle, the influence of the change of an external magnetic field on alternating current loss is generated; when the external magnetic field intensity is not changed, under a certain magnetic field angle, different transmission currents cause the change of alternating current loss.
The method is simple to operate, convenient to use and accurate in measurement, and compared with the traditional background magnet, the runway-type background magnet has a background magnetic field with longer length and better uniformity, is more favorable for measuring the alternating current loss characteristic of the high-temperature superconducting tape with larger width and thickness, can be used for measuring the critical current characteristic of the high-temperature superconducting tape, and has diversified functions. When the device is used, the device is flatly placed in a low-temperature resistant container, so that the use of liquid nitrogen materials can be effectively reduced.
Claims (4)
1. A runway type background magnet device for superconducting strip testing is characterized in that copper wires are respectively wound on left side and right side coil frameworks (16, 17) to form left side and right side runway type coils (3, 4); one end of each of the left side coil framework and the right side coil framework (16 and 17) is respectively assembled in a first runway-shaped positioning groove and a second runway-shaped positioning groove (24-1 and 24-2) of the middle magnetic field generation area framework; the other ends of the left side coil framework and the right side coil framework (16 and 17) are respectively assembled on the track-shaped positioning grooves (1-1 and 2-1) of the left side fixing plate and the right side fixing plate;
a leading-out wire at one end of the left runway type coil (3) is led out from a first wire outlet (13-1) of the left fixing plate; a lead-out wire at the other end of the left runway type coil (3) is led out from a second lead-out port (13-2) of the left fixing plate;
a leading-out wire at one end of the right runway type coil (4) is led out from a third wire outlet (13-3) of the right fixing plate; a leading-out wire at the other end of the right runway type coil (4) is led out from a fourth wire outlet (13-4) of the right fixing plate;
the first to fourth threaded rods (33-1, 33-2, 33-3 and 33-4) respectively pass through the first to fourth left side plate fixing holes (28-1, 28-2, 28-3 and 28-4) and the first to fourth right side plate fixing holes (38-1, 38-2, 38-3 and 38-4), and then nuts are screwed on two ends of each threaded rod, so that the middle magnetic field generation area frame (5), the left runway type coil (3), the right runway type coil (4), the left fixing plate (1) and the right fixing plate (2) are built to form an assembly body with a compact structure;
the top plate (7) and the middle magnetic field generation area frame (5) are fixedly connected with a first threaded hole (23-1) of the frame through a first through hole (29-1) of the top plate by a bolt;
the bottom plate (10) and the middle magnetic field generation area frame (5) are fixedly connected with a second threaded hole (23-2) of the frame through a first through hole (30-1) of the bottom plate by a bolt;
the top plate (7) is in screw connection with the left and right fixing plates (1, 2) through bolts passing through the second and third through holes (29-2, 29-3) of the top plate and the first threaded hole (39-1) of the left fixing plate and the third threaded hole (39-3) of the right fixing plate;
the bottom plate (10) is in screw connection with the left and right fixing plates (1, 2) through bolts passing through the second and third fixing through holes (30-2, 30-3) of the bottom plate, the second threaded hole (39-2) of the left fixing plate and the fourth threaded hole (39-4) of the right fixing plate;
two ends of the strip clamp and the strip assembly body (12) respectively penetrate through the central circular hole (31) of the top plate and the central circular hole (32) of the bottom plate, and the strip clamp and the strip assembly body are placed in the strip magnetic field channel (15); then inserting a top strip clamp fixing disc (8) and a bottom strip clamp fixing disc (11) into a top plate central circular hole (31) and a bottom plate central circular hole (32) from two ends of a strip clamp and strip assembly body (12) respectively, so that the strip clamp and strip assembly body (12) are clamped in a top strip clamp fixing frame (22) and a bottom strip clamp fixing frame (26); placing the angle fixing left wing (21-1) and the angle fixing right wing (21-2) of the top strip clamp fixing disc (8) in the first and second rectangular tooth grooves (c1, c2) or the nineteenth and twentieth rectangular tooth grooves (c19, c20) as initial positions;
then inserting a strip channel sealing plate (19) into the opening of the middle magnetic field generation area frame (5); meanwhile, the first and second voltage leads (40-1, 40-2) are led out through the voltage lead holes (20).
2. The racetrack background magnet device for superconducting tape testing according to claim 1, wherein the left side fixing plate (1) and the right side fixing plate (2) are in a symmetrical state, and the left side fixing plate (1) and the right side fixing plate (2) are respectively provided with a left side fixing plate racetrack positioning groove (1-1) and a right side fixing plate racetrack positioning groove (2-1), and the dimensions of the racetrack background magnet device are completely the same as the racetrack cross-sectional shapes of the left side coil framework (16) and the right side coil framework (17); a first copper wire outlet (13-1), a second copper wire outlet (13-1, 13-2), a third copper wire outlet (13-3), a fourth copper wire outlet (13-4) and the distance between the first copper wire outlet and the fourth copper wire outlet is the same as the coil thickness.
3. The racetrack background magnet device for superconducting tape testing according to claim 1, wherein the tape clamp and tape assembly (12) comprises a tape clamp (6), a first T-shaped copper sheet (9-1), a second T-shaped copper sheet (9-2), a high-temperature superconducting tape (14), and first and second voltage leads (40-1, 40-2); the first T-shaped copper sheet (9-1) and the second T-shaped copper sheet (9-2) are embedded at two ends of the strip clamp (6), and a first electrifying cable threaded hole (27-1) and a second electrifying cable threaded hole (27-2) are respectively arranged on the transverse edge of the T shape; the high-temperature superconducting tape (14) is placed in a central rectangular area of the tape clamp (6), a first tape pressing material copper sheet and a second tape pressing material copper sheet (25-1 and 25-2) are respectively placed at two ends of the high-temperature superconducting tape (14), and the high-temperature superconducting tape (14) is fixed in the central rectangular area of the tape clamp (6) by respectively passing through holes at two ends of the first tape pressing material copper sheet and the second tape pressing material copper sheet (25-1 and 25-2) and a first fixing bolt channel, a second fixing bolt channel, a third fixing bolt channel, a fourth fixing bolt channel, a third fixing bolt channel, a; one end of each of the first voltage lead (40-1) and the second voltage lead (40-2) is welded to the middle of the high-temperature superconducting tape (14), the interval between the two welding points is 10-15 mm, and the first voltage lead and the second voltage lead are twisted into a strand and led out through the voltage lead hole (20).
4. The racetrack background magnet device for superconducting tape testing according to claim 1, wherein the top plate (7) is provided with a top plate central circular hole (31), and first to twenty-second rectangular slots (c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19 and c20) are arranged on the circumference of the top plate, two rectangular slots on the same diameter are in one group, each group is separated by 10 degrees, and the first rectangular slot (c1) is separated from the nineteenth rectangular slot (c19), and the second rectangular slot (c2) is separated from the twentieth rectangular slot (c20) by 90 degrees;
the two sides of the top strip clamp fixing disc (8) respectively extend out of an angle fixing left wing (21-1) and an angle fixing right wing (21-2), the center lines of the two wings are on the same diameter, and the shape and the size of the two wings are completely the same as those of first to twenty rectangular tooth grooves (c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19 and c20), and the two wings are matched with each other.
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| CN201811579810.1A CN109916995B (en) | 2018-12-24 | 2018-12-24 | Runway type background magnet for superconducting strip test |
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| JPH06275429A (en) * | 1993-03-19 | 1994-09-30 | Sumitomo Electric Ind Ltd | Race track type superconducting magnet |
| JP2004335541A (en) * | 2003-04-30 | 2004-11-25 | Central Japan Railway Co | Superconducting magnetically slope levitated system |
| JP5879749B2 (en) * | 2011-05-30 | 2016-03-08 | 住友電気工業株式会社 | Superconducting coil, superconducting magnet, and manufacturing method of superconducting coil |
| CN106504849B (en) * | 2016-12-14 | 2018-10-26 | 云南电网有限责任公司电力科学研究院 | A kind of high temperature superconductive wire ring framework |
| CN106710866B (en) * | 2017-03-17 | 2018-09-25 | 西安聚能超导磁体科技有限公司 | A kind of device for racetrack superconducting coil coiling |
| CN108766708A (en) * | 2018-05-21 | 2018-11-06 | 西安聚能超导磁体科技有限公司 | A kind of abnormity high-temperature superconductor racetrack bobbin for coil and winding method |
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