A high-temperature superconducting tape stacking magnetic levitation system with high guidance performance

Abstract

The present invention discloses a high-temperature superconducting tape stacking magnetic levitation system with high guiding performance, which includes a cold source, a superconductor arrangement and a magnetic field source; the superconductor arrangement is composed of a plurality of superconducting tape stacks; the cold source and the superconductor arrangement are arranged above the magnetic field source in sequence from top to bottom, the cold source cools the superconductor arrangement, and the magnetic field source provides an applied external magnetic field; the superconducting tape stack adopts curved surface stacking or flat surface stacking, when the superconducting tape stack adopts curved surface stacking, the stacking curved surface is arranged along the magnetic field streamline of the region; when the superconducting tape stack adopts flat surface stacking, the stacking plane is arranged along the magnetic field streamline of the region through horizontal, vertical and inclined stacking combinations. The present invention overcomes the shortcomings of difficult processing and low efficiency of vertically arranged superconducting blocks and limited guiding performance of horizontal and vertical stacks of superconducting tapes. The system achieves excellent guiding performance without increasing the deadweight and cost of the system.

Description

Technical Field

[0001] The invention relates to the application field of high-temperature superconducting magnetic levitation technology, and in particular to a high-temperature superconducting tape stacking magnetic levitation system with high guidance performance. Background Art

[0002] The high-temperature superconducting maglev system has self-stabilizing suspension and guidance capabilities, and its translation system has a theoretical maximum operating speed of 3000 km / h. Therefore, it has broad application prospects in ground ultra-high-speed transportation systems. However, the guidance performance of the high-temperature superconducting maglev system is relatively weak, and improving its guidance performance is the key to its practical application. The existing technologies mainly include:

[0003] 1. If Figure 1 As shown, the relevant patents have been published, and the horizontal or vertical superconducting block C axis (22, 29) is set perpendicular to the magnetization direction facing the magnet, so that the system can obtain higher guidance performance. However, in actual applications, the superconducting block is usually set horizontally and its seed point 23 faces the permanent magnet track 3. When its thickness exceeds about 10 mm, its guidance performance tends to saturate. When the superconducting block is set vertically, on the one hand, the superconducting block needs to be machined. Since the superconducting block is a ceramic material at room temperature, the machining is easily damaged, resulting in performance degradation or damage; on the other hand, when the vertical magnetization magnet area is wide (more than 10 mm), the use efficiency of the superconducting block material will be reduced. The use of multiple superconductors in combination and vertical setting, in addition to the need for mechanical processing, also increases the amount of superconducting material, thereby bringing higher costs.

[0004] 2. If Figure 2 As shown in the relevant literature, the system can obtain higher guidance performance by setting the C axis of the vertical or horizontal stack of superconducting tapes (25, 27) perpendicular to the magnetization direction of the magnet. From the perspective of material properties, compared with superconducting bulk materials, superconducting tape stacks have higher magnetic levitation performance, but relevant patents have been published, and their performance is highly correlated with the orientation of the tape stack relative to the spatial magnetic field, such as Figure 3 As shown, since the external magnetic field distribution of the permanent magnet track is not a simple horizontal and vertical distribution, it is difficult to obtain a guiding performance better than that of a superconducting block combination by combining horizontal and vertical stacking of superconducting tapes.

[0005] 3. Other technologies include: reducing the operating temperature of the system through nitrogen cooling or refrigerators, using high-performance superconducting materials and increasing the amount of superconducting materials to improve the critical current density and the ability to capture magnetic flux of the system; increasing the amount of permanent magnetic materials, residual magnetism and optimizing the configuration of permanent magnetic tracks to improve the strength of the applied external magnetic field of the permanent magnetic track. The above methods mainly improve the performance of materials, increase the amount of materials and optimize the system to achieve higher guidance performance, but at the same time, they will also bring higher dead weight and high costs. Summary of the invention

[0006] In order to overcome the shortcomings of the prior art such as the difficulty in processing and low efficiency of vertically arranged superconducting blocks and the limited guidance performance of superconducting tape stacking magnetic levitation systems, the present invention provides a high-temperature superconducting tape stacking magnetic levitation system with high guidance performance, so that the system can obtain excellent guidance performance without increasing the system's own weight and cost.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A high-temperature superconducting tape stacking magnetic levitation system with high guidance performance comprises a cold source, a superconductor arrangement and a magnetic field source; the superconductor arrangement is composed of a plurality of superconducting tape stacks; the cold source and the superconductor arrangement are arranged above the magnetic field source in sequence from top to bottom, the cold source cools the superconductor arrangement, and the magnetic field source provides an applied external magnetic field; the superconducting tape stacks are stacked on a curved surface or a flat surface, and when the superconducting tape stacks are stacked on a curved surface, the stacking curved surface is arranged along the magnetic field streamline of the region; when the superconducting tape stacks are stacked on a flat surface, the stacking plane is arranged along the magnetic field streamline of the region through a combination of horizontal, vertical and inclined stacking.

[0009] Furthermore, the superconducting tape stack is stacked by ReBaCuO tapes or other superconducting material tapes along a circular arc surface, a horizontal surface, a vertical surface or other arbitrary curved surface or an inclined plane, and different stack thicknesses are set by controlling the number of stacking layers, wherein Re is a rare earth element.

[0010] Furthermore, when the superconducting tape stack is a curved stack, an arc stack is arranged directly above the horizontally magnetized magnetic field source and arranged in a cascade arrangement in the transverse direction.

[0011] Furthermore, when the superconducting tape stack is a planar stack, a horizontal stack is arranged directly above the horizontally magnetized magnetic field source, a right-inclined stack and a left-inclined stack are arranged on both sides respectively, and a vertical stack is arranged directly above the vertically magnetized magnetic field source.

[0012] Furthermore, the cold source is provided by a normal-pressure liquid nitrogen or low-pressure solid nitrogen cryogenic container and a refrigerator, and the superconductor arrangement is directly or indirectly cooled by liquid nitrogen, solid nitrogen, and a cold head.

[0013] Furthermore, the magnetic field source is a single magnet combination structure of a permanent magnet, an electromagnet, a superconducting wire or a strip coil magnet, or a combination structure of any two or more.

[0014] Furthermore, when the magnetic field source is assembled using permanent magnet units, its transverse structure is arranged with magnetic poles facing each other horizontally or in a Halbach array to form a monopolar or multipolar permanent magnetic track.

[0015] Compared with the prior art, the invention has the following beneficial effects: it overcomes the shortcomings of difficult processing and low efficiency of vertically arranged superconducting blocks and limited guiding performance of horizontal and vertical stacks of superconducting tapes, and enables the system to achieve excellent guiding performance without increasing the weight and cost of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are further supplementary descriptions of the present invention, but are not intended to limit the embodiments of the present invention. In the accompanying drawings:

[0017] Figure 1 Schematic diagram of setting the C axis of the superconducting bulk material perpendicular to the magnetization direction;

[0018] Figure 2 Schematic diagram of setting the C axis of the superconducting tape stack to be perpendicular to the magnetization direction;

[0019] Figure 3 It is a schematic diagram of the distribution of the external magnetic field streamlines of the permanent magnet track;

[0020] Figure 4 Schematic diagram of the superconducting tape curved surface stacking magnetic levitation system;

[0021] Figure 5 Schematic diagram of the superconducting tape plane stacking magnetic levitation system;

[0022] Names of the reference numerals in the accompanying drawings:

[0023] 1-cold source, 2-superconductor arrangement, 21-horizontal superconducting block, 22-horizontal superconducting block C-axis, 23-superconducting block seed point, 24-superconducting tape vertical stack, 25-superconducting tape vertical stack C-axis, 26-superconducting tape horizontal stack, 27-superconducting tape horizontal stack C-axis, 28-vertical superconducting block, 29-vertical superconducting block C-axis, 210-superconducting tape arc stack, 211-superconducting tape right inclined stack, 212-superconducting tape left inclined stack, 3-permanent magnet track, 31-horizontally magnetized magnet, 32-vertically magnetized magnet. DETAILED DESCRIPTION

[0024] According to literature reports, placing the horizontal stack of superconducting tapes directly above the vertical magnetized magnet and the horizontal magnetized magnet can obtain higher suspension force and guiding force respectively, but its performance is still lower than that of the maglev system composed of superconducting blocks of the same specifications. This is because the applied external magnetic field above the permanent magnetic track is not simply horizontally and vertically distributed, and the performance of the superconducting tape stack is highly oriented relative to the spatial magnetic field. In the report of the relevant patent, when the superconducting tapes are stacked along the scalar magnetic potential curve of the magnetic field, that is, the magnetic field streamline is perpendicular to the stacking surface of the tapes, the system can obtain excellent suspension performance, and a complete theoretical analysis and simulation experimental data are given. Therefore, according to the above literature and patents, it can be inferred that when the superconducting tapes are stacked along the magnetic field streamlines in the area, that is, when the scalar magnetic potential curve of the magnetic field is perpendicular to the stacking surface of the tapes, the system can obtain excellent guiding performance.

[0025] Based on the above ideas, the present invention adopts the following scheme:

[0026] Embodiment 1:

[0027] like Figure 4 The schematic diagram of the superconducting tape curved surface stacking magnetic levitation system shown in the figure, the system as a whole includes a cold source 1, a superconductor arrangement 2, and a magnetic field source 3 arranged in sequence from top to bottom. The superconductor arrangement 2 is composed of a plurality of superconducting tape stacks, the cold source 1 cools the superconductor arrangement 2, and the magnetic field source 3 provides an applied external magnetic field. When the superconducting tape stack is stacked in a curved surface, the stacking curved surface is arranged along the magnetic field streamline in the area, so that the system can obtain excellent guidance performance.

[0028] Preferably, when the superconducting tape stack is a curved stack, Figure 3 The schematic diagram of the distribution of the external magnetic field streamlines of the permanent magnet track is shown, and the superconducting tape arc stack 210 is arranged directly above the horizontal magnetization magnet 31 and arranged in a cascade arrangement in the transverse direction;

[0029] Preferably, the cold source 1 is provided by a normal pressure liquid nitrogen or low pressure solid nitrogen cryogenic container and a refrigerator, and the superconductor arrangement 2 is directly or indirectly cooled by liquid nitrogen, solid nitrogen, and a cold head;

[0030] Preferably, the magnetic field source 3 is a single magnet combination structure of a permanent magnet, an electromagnet, a superconducting wire (strip) coil magnet, or a combination structure of any two or more;

[0031] Preferably, when the magnetic field source 3 is assembled using permanent magnet units, its transverse structure is arranged in a horizontal top-to-top arrangement of magnetic poles or a Halbach array to form a monopolar or multipolar permanent magnetic track.

[0032] Embodiment 2:

[0033] like Figure 5The schematic diagram of the superconducting tape plane stacking maglev system shown in the figure, the system as a whole includes a cold source 1, a superconductor arrangement 2, and a magnetic field source 3 arranged in sequence from top to bottom. The superconductor arrangement 2 is composed of a plurality of superconducting tape stacks, the cold source 1 cools the superconductor arrangement 2, and the magnetic field source 3 provides an applied external magnetic field. When the superconducting tape stack is stacked in a plane, the stacking plane is arranged along the magnetic field streamline of the area through horizontal, vertical, and inclined stacking combinations, so that the system can obtain excellent guidance performance.

[0034] Preferably, when the superconducting tape stack is a planar stack, Figure 3 The schematic diagram of the streamline distribution of the external magnetic field of the permanent magnet track shown in the figure shows that a horizontal stack of superconducting tapes 26 is arranged directly above the horizontal magnetization magnet 31, a right-inclined stack of superconducting tapes 211 and a left-inclined stack of superconducting tapes 212 are arranged on both sides, and a vertical stack of superconducting tapes 24 is arranged directly above the vertical magnetization magnet;

[0035] Preferably, the cold source 1 is provided by a normal pressure liquid nitrogen or low pressure solid nitrogen cryogenic container and a refrigerator, and the superconductor arrangement 2 is directly or indirectly cooled by liquid nitrogen, solid nitrogen, and a cold head;

[0036] Preferably, the magnetic field source 3 is a single magnet combination structure of a permanent magnet, an electromagnet, a superconducting wire (strip) coil magnet, or a combination structure of any two or more;

[0037] Preferably, when the magnetic field source 3 is assembled using permanent magnet units, its transverse structure is arranged in a horizontal top-to-top arrangement of magnetic poles or a Halbach array to form a monopolar or multipolar permanent magnetic track.

[0038] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-temperature superconducting tape stacking magnetic levitation system with high guidance performance, characterized in that: It includes a cold source, a superconductor arrangement and a magnetic field source; the superconductor arrangement is composed of a plurality of superconducting tape stacks; the cold source and the superconductor arrangement are arranged in sequence above the magnetic field source from top to bottom, the cold source cools the superconductor arrangement, and the magnetic field source provides an applied external magnetic field; the superconducting tape stack adopts curved surface stacking or flat surface stacking, when the superconducting tape stack adopts curved surface stacking, the stacking curved surface is arranged along the magnetic field streamline of the area; when the superconducting tape stack adopts flat surface stacking, the stacking plane is arranged along the magnetic field streamline of the area through a combination of horizontal, vertical and inclined stacking; the superconducting tape stack is stacked by ReBaCuO tapes along an arc surface, a horizontal surface, a vertical surface or an inclined plane, and different stacking thicknesses are set by controlling the number of stacking layers, wherein Re is a rare earth element; the cold source is provided by a normal pressure liquid nitrogen or low pressure solid nitrogen cryogenic container and a refrigerator, and the superconductor arrangement is directly or indirectly cooled by liquid nitrogen, solid nitrogen and a cold head.

2. A high-temperature superconducting tape stacking magnetic levitation system with high guidance performance according to claim 1, characterized in that: When the superconducting tape stack is a curved stack, an arc stack is arranged directly above a horizontally magnetized magnetic field source and arranged in a cascade arrangement in a transverse direction.

3. A high-temperature superconducting tape stacking magnetic levitation system with high guidance performance according to claim 1, characterized in that: When the superconducting tape stack is a planar stack, a horizontal stack is arranged directly above a horizontally magnetized magnetic field source, a right-inclined stack and a left-inclined stack are arranged on both sides respectively, and a vertical stack is arranged directly above a vertically magnetized magnetic field source.

4. The high-temperature superconducting tape stacking magnetic levitation system with high guidance performance according to claim 1, characterized in that: The magnetic field source is a single magnet combination structure of a permanent magnet, an electromagnet, a superconducting wire or a strip coil magnet, or a combination structure of any two or more.

5. A high-temperature superconducting tape stacking magnetic levitation system with high guidance performance according to claim 4, characterized in that: When the magnetic field source is assembled using permanent magnet units, its transverse structure is arranged in a horizontal top-to-top arrangement of magnetic poles or in a Halbach array to form a monopolar or multipolar permanent magnetic track.

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