CN213815795U - High-temperature superconducting flux pump based on traveling wave magnetic field - Google Patents
High-temperature superconducting flux pump based on traveling wave magnetic field Download PDFInfo
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- CN213815795U CN213815795U CN202023171362.7U CN202023171362U CN213815795U CN 213815795 U CN213815795 U CN 213815795U CN 202023171362 U CN202023171362 U CN 202023171362U CN 213815795 U CN213815795 U CN 213815795U
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Abstract
The utility model discloses a high-temperature superconducting flux pump based on a traveling wave magnetic field, which comprises a flux pump device and a driving circuit, wherein the flux pump device comprises an iron core, a copper spiral coil, a stacked superconducting strip and an aluminum alloy frame; the copper spiral coil is formed by winding a copper wire, the center of the copper spiral coil penetrates through an iron core and is fixed on a customized aluminum alloy frame through the iron core, the copper spiral coil is divided into an upper layer and a lower layer which are correspondingly arranged, and the copper spiral coil arranged in the same row and the copper spiral coil arranged in the same position on the lower layer are connected with a group of driving circuits; a plurality of stacked superconducting strips which are mutually perpendicular and crossed are arranged between the two groups of copper solenoids, and each stacked superconducting strip is formed by stacking and welding 3 high-temperature superconducting strips. The utility model discloses mainly solve the excitation problem of high temperature superconducting magnet system closed loop function, reduce the volume of superconducting magnet load power supply unit on the large-scale scientific equipment, improve output current and excitation efficiency, reduce the system operation loss, reduce the running cost of superconducting magnet load.
Description
Technical Field
The utility model relates to a high temperature superconducting magnet technical field especially relates to a high temperature superconducting flux pump based on travelling wave magnetic field.
Background
The high-temperature superconducting magnet can generate a strong background magnetic field and has wide application prospect, but when the high-temperature superconducting magnet works in a continuous current mode, a magnetic flux peristaltic effect and joint resistance exist, so that current in a closed superconducting loop is attenuated. The application of a traditional external power supply to magnetize the superconducting magnet requires a large-current power supply device, and the energy loss is large. The patent designs a novel non-contact magnetizing technology, namely a high-temperature superconducting flux pump based on a traveling wave magnetic field, and direct current is injected into a superconducting closed-loop system to compensate current attenuation under the condition of no electric contact, so that the heat loss caused by the current lead of the traditional power supply is avoided. The technology can be used for manufacturing a superconducting new energy device with a high-stability strong magnetic field, and contributes to technical innovation in the engineering application fields of public transportation, medical equipment, high-energy physics and the like.
At present, a superconducting magnet is magnetized mainly by direct driving of a power supply. The traditional direct power supply driving method needs to be connected with a current lead, the current lead is bridged between a room temperature environment and a low temperature environment of a magnet to form a heat leakage source, and the lead also generates Joule heat to form an additional heat source when electrified and excited. The leakage heat source and the additional heat source are extremely unfavorable for maintaining the low temperature of the superconducting magnet, and particularly for the large-current superconducting magnet, the heat loss power of the lead is quite high, and the refrigeration burden is large.
SUMMERY OF THE UTILITY MODEL
The utility model provides a high temperature superconductive flux pump based on travelling wave magnetic field to the actual problem that exists among the prior art.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a high-temperature superconducting flux pump based on a traveling wave magnetic field is applied to a liquid nitrogen environment and comprises a flux pump device and a driving circuit, wherein the flux pump device comprises an iron core, a copper solenoid coil, a stacked superconducting strip and an aluminum alloy frame; the copper spiral coil is formed by winding a copper wire, an iron core penetrates through the center of the copper spiral coil and is fixed on a customized aluminum alloy frame through the iron core, the copper spiral coil is divided into an upper layer and a lower layer which are correspondingly arranged, and the copper spiral coil arranged in the same row and the copper spiral coil arranged in the same position on the lower layer are connected with a group of driving circuits; and a plurality of stacked superconducting strips which are mutually perpendicular and crossed are arranged between the two groups of copper solenoids, and each stacked superconducting strip is formed by stacking and welding 3 high-temperature superconducting strips.
Further, an air gap between the two layers of copper spiral coils is 5 mm.
Furthermore, a plurality of stacked superconducting tapes are placed in the air gap after being stacked and perpendicularly crossed and welded, the distance between the stacked superconducting tapes and the copper spiral coils on the upper layer and the lower layer is 0.5mm, and the distance between the stacked superconducting tapes on each layer is 1 mm.
Furthermore, the high-temperature superconducting tape is an sc1270420-7YBCO superconducting tape which is 10mm wide, is packaged by copper plating and can bear the maximum current of 480A.
Furthermore, the number of the copper spiral coils is 8, copper wires with the diameter of 1.5mm are wound on the plastic bobbin, the number of the copper spiral coils is 150, and the operating current is not more than 20A.
Furthermore, the driving circuit is composed of a signal generator, a switching power supply, an LM3886 power amplifier chip and a resistor, wherein the output voltage of the switching power supply is 24V, and the output current of the switching power supply is 2.8A.
Further, the iron core is a pure iron core with the diameter of 12mm and the length of 10 cm.
Further, the aluminum alloy frame is a custom made two-layer aluminum alloy frame with dimensions of 16cm by 10 cm.
The utility model discloses following beneficial effect has:
1) the utility model discloses a superposition of upper and lower two-layer copper spiral coil has improved the superconducting tape and has placed regional magnetic field intensity, makes the conversion rate of energy obtain obvious promotion, and efficiency improves the one time.
2) The utility model discloses the regional high temperature superconducting tape of response is through piling up and vertical cross welding handle, and load end current amplitude increases substantially.
3) The utility model discloses small, the size is 16cm 10cm, simple structure. No need of precise control instrument and component, easy manufacture and low cost.
4) The utility model discloses need not remove or rotatory magnet reaches the purpose that produces the travelling wave magnetic field, the system is more stable, but long-time uninterrupted duty.
5) The utility model can control the amplitude and speed of the travelling wave magnetic field by controlling the amplitude and frequency of the current, and can control the amplitude and frequency of the output current, so that the system is more stable and controllable;
6) the utility model discloses a flux pump excitation system does not need thermal excitation switch or current switch based on the superconductive attitude of high temperature superconductor and the switching of normal attitude, has eliminated because of the heat loss that the switching action produced, therefore energy loss is littleer, and the running cost is also lower.
Drawings
Fig. 1 is a schematic structural diagram of a high-temperature superconducting flux pump based on a traveling wave magnetic field according to the present invention;
FIG. 2 is a schematic diagram of a driving circuit;
FIG. 3 is a schematic diagram of a magnetic flux pump system;
fig. 4 is a schematic perspective view of a high-temperature superconducting flux pump based on a traveling-wave magnetic field according to the present invention;
fig. 5 is a flowchart of the work flow of the high-temperature superconducting flux pump based on the traveling wave magnetic field.
Reference numerals: 1-an iron core; 2-copper spiral coil; a 3-aluminum alloy frame; 4-YBCO superconducting tape; 5-high temperature superconducting load coils; 6-LM3886 power amplifier chip; 7-a flux pump device; 8-resistance.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Compared with direct drive of a power supply, the magnetic flux pump has the following characteristics: the flux pump is not directly connected with the load magnet, so that an external power supply, a current switch and a current lead are omitted, the phenomenon that the large current supplied by the superconducting magnet directly enters a cryogenic region is avoided, the heat source and the heat bridge effect of the traditional lead are obviously weakened, the performance is stable, and the heat loss is small; the power of the magnetic flux pump is low, complex power supply equipment is not needed, and the cost is obviously reduced; and the flux pump has small volume, high energy conversion efficiency and convenient adjustment of output current, and can be used for compensating a small amount of current.
The utility model discloses well flux pump is distinguished from traditional flux pump technique and has following characteristics: 1) the switching between the superconducting state and the normal state of the high-temperature superconductor is not based, the superconductor cannot be in the normal state at any time, and only the critical state of the superconductor is modified; 2) the volume is small, the structure is simple, the purpose of generating a traveling wave magnetic field is achieved without moving or rotating a magnet, and the system is more stable and controllable; 3) and a thermal excitation switch or a current switch is not needed, so that the energy loss is less and the operation cost is lower.
The realization of the magnetic flux pump technology is expected to not only popularize the high-temperature superconducting MRI equipment in the future, but also effectively solve the excitation problem of the closed-loop operation of the high-temperature superconducting magnet system. In some large scientific equipment, such as a high-energy particle accelerator, the magnetic field of the accelerator after the high-temperature superconducting magnet is used can be increased by several times, and under the condition that the radius of the ring of the accelerator is the same, the superconducting magnet can not only increase the energy of the accelerator, but also greatly reduce the electric energy consumption and the operating cost. In the field of electrician, compared with the conventional motor, the superconducting synchronous generator using the superconducting magnet has the advantages of high efficiency, light weight, small volume, large single-machine capacity and good stability.
The utility model discloses mainly solve the excitation problem of high temperature superconducting magnet system closed loop function, reduce the volume of superconducting magnet load power supply unit on the large-scale scientific equipment, improve output current and excitation efficiency, reduce the system operation loss, reduce the running cost of superconducting magnet load.
Referring to fig. 1-4, the present invention provides an embodiment: a high-temperature superconducting flux pump based on a traveling wave magnetic field is applied to a liquid nitrogen environment and comprises a flux pump device 7 and a driving circuit, wherein the flux pump device 7 comprises an iron core 1, a copper solenoid 2, a stacked superconducting strip and an aluminum alloy frame 3; the copper spiral coil 2 is formed by winding a copper wire, the center of the copper spiral coil is penetrated by an iron core 1 and is fixed on a customized aluminum alloy frame 3 through the iron core 1, the copper spiral coil 2 is divided into an upper layer and a lower layer which are correspondingly arranged, and the copper spiral coil 2 arranged in the same row and the copper spiral coil 2 arranged in the same position of the lower layer are connected with a group of driving circuits; a plurality of stacked superconducting strips which are mutually perpendicular and crossed are arranged between the two groups of copper solenoids 2, and each stacked superconducting strip is formed by stacking and welding 3 high-temperature superconducting strips.
In the embodiment, the air gap between the two layers of copper spiral coils 2 is 5 mm; the iron core 1 is a pure iron core with the diameter of 12mm and the length of 10 cm; the aluminum alloy frame 3 is a customized double-layer aluminum alloy frame, the size is 16cm x 10cm, and a liquid nitrogen environment is provided by a constant temperature box and liquid nitrogen.
In this embodiment, a plurality of the stacked superconducting tapes are stacked and vertically cross-welded, and then placed in the air gap, and the distance between the stacked superconducting tapes and the upper and lower copper spiral coils 2 is 0.5mm, and the distance between the stacked superconducting tapes in each stacked layer is 1 mm. The output terminal of the flux pump device is composed of superconducting tapes in parallel, and the whole device is placed in a thermostat and kept in a 77k environment by liquid nitrogen (as shown in fig. 4).
In the embodiment, the high-temperature superconducting tape is sc1270420-7YBCO superconducting tape 4 which is 10mm wide, is encapsulated by copper plating and can bear the maximum current of 480A.
In this embodiment, the number of the copper spiral coils 2 is 8, the copper wire with the diameter of 1.5mm is wound on the plastic bobbin, each copper spiral coil 2 has 150 turns, and the operating current is not more than 20A.
In this embodiment, the driving circuit is composed of a signal generator, a switching power supply, an LM3886 power amplifier chip 6 and a resistor 8 (as shown in fig. 2), and the output voltage of the switching power supply is 24V and the output current is 2.8A.
The high-temperature superconducting flux pump technology is the only method which uses a small applied field to magnetize a superconducting coil and finally obtains a large capture field at present, and establishes a relatively large magnetic field in a high-temperature superconducting material by using a relatively small magnetic field through an electromagnetic induction principle, and accumulates external discrete magnetic flux to a superconducting magnet step by using a traveling wave magnetic field to induce current so as to realize the magnetizing of the high-temperature superconducting magnet.
The design principle of the driving circuit is based on a power amplifier, and the LM3886 power amplifier chip 6 is supplied with power by a switching power supply. The driving circuit provides current input with different amplitudes, frequencies, waveforms and phases for the copper spiral coils 2, the 8 copper spiral coils are divided into two groups which are respectively driven by 2 sets of driving circuits, and the copper spiral coils arranged in the same row and the copper spiral coils 2 arranged at the same lower layer are in the same group. Stacked superconducting strips which are mutually perpendicular and crossed are placed between the two groups of copper spiral coils 2, each branch is formed by stacking and welding 3 ultrathin YBCO superconducting strips 4 (shown in figure 1), the welding material is Sn63Pb37 with the melting point of 183 ℃, and each branch is connected with a load coil under the condition of parallel connection, so that the amplitude of the output current of the flux pump device is improved through multi-channel induction. The two groups of driving circuits are respectively switched back and forth to achieve the purpose of controlling the input currents of the two groups of coils, so that phase difference exists between the currents in the two groups of copper spiral coils 2, the electromagnetic waves which travel in the air gap, namely travelling wave magnetic fields, can be generated by repeated switching conduction, and the amplitude and the frequency of the magnetic fields are related to the amplitude and the frequency of the currents in the copper spiral coils 2. According to faraday's law, the traveling magnetic field generates an induced electric field and induces an induced current in the superconducting tapes, which is output to the load coil 5 by the high-temperature superconducting tapes connected to the load (as shown in fig. 3 and 5).
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.
Claims (8)
1. The high-temperature superconducting flux pump based on the traveling wave magnetic field is characterized by comprising a flux pump device and a driving circuit, wherein the flux pump device comprises an iron core, a copper spiral coil, a stacked superconducting strip and an aluminum alloy frame; the copper spiral coil is formed by winding a copper wire, an iron core penetrates through the center of the copper spiral coil and is fixed on a customized aluminum alloy frame through the iron core, the copper spiral coil is divided into an upper layer and a lower layer which are correspondingly arranged, and the copper spiral coil arranged in the same row and the copper spiral coil arranged in the same position on the lower layer are connected with a group of driving circuits; a plurality of stacked superconducting strips which are mutually perpendicular and crossed are arranged between the two groups of copper spiral coils, and each stacked superconducting strip is formed by stacking and welding 3 high-temperature superconducting strips.
2. A traveling-wave magnetic field-based high-temperature superconducting flux pump according to claim 1, wherein: and an air gap between the two layers of copper spiral coils is 5 mm.
3. A traveling-wave magnetic field-based high-temperature superconducting flux pump according to claim 1, wherein: and a plurality of stacked superconducting strips are placed in an air gap after being stacked and vertically crossed and welded, the distance between the stacked superconducting strips and the copper spiral coils on the upper layer and the lower layer is 0.5mm, and the distance between the stacked superconducting strips on each layer is 1 mm.
4. A traveling-wave magnetic field-based high-temperature superconducting flux pump according to claim 1, wherein: the high-temperature superconducting tape is an sc1270420-7YBCO superconducting tape which is 10mm wide, is packaged by copper plating and can bear the maximum current of 480A.
5. A traveling-wave magnetic field-based high-temperature superconducting flux pump according to claim 1, wherein: the number of the copper spiral coils is 8, copper wires with the diameter of 1.5mm are wound on the plastic bobbin, each copper spiral coil has 150 turns, and the operating current is not more than 20A.
6. A traveling-wave magnetic field-based high-temperature superconducting flux pump according to claim 1, wherein: the drive circuit comprises signal generator, switching power supply, LM3886 power amplifier chip and resistance, switching power supply's output voltage 24V, output current 2.8A.
7. A traveling-wave magnetic field-based high-temperature superconducting flux pump according to claim 1, wherein: the iron core is a pure iron core with the diameter of 12mm and the length of 10 cm.
8. A traveling-wave magnetic field-based high-temperature superconducting flux pump according to claim 1, wherein: the aluminum alloy frame is a custom made two-layer aluminum alloy frame having dimensions of 16cm by 10 cm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113628828A (en) * | 2021-08-23 | 2021-11-09 | 上海交通大学 | High-temperature superconducting flux pump and iron core winding current waveform control method thereof |
| CN117542602A (en) * | 2024-01-10 | 2024-02-09 | 四川大学 | Superconducting magnetic flux pump with photovoltaic direct-current voltage output and excitation experiment system |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113628828A (en) * | 2021-08-23 | 2021-11-09 | 上海交通大学 | High-temperature superconducting flux pump and iron core winding current waveform control method thereof |
| CN117542602A (en) * | 2024-01-10 | 2024-02-09 | 四川大学 | Superconducting magnetic flux pump with photovoltaic direct-current voltage output and excitation experiment system |
| CN117542602B (en) * | 2024-01-10 | 2024-03-12 | 四川大学 | Superconducting magnetic flux pump with photovoltaic direct-current voltage output and excitation experiment system |
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