Non-contact current compensation method for high-temperature superconducting electric suspension magnet

Abstract

The invention discloses a non-contact current compensation method for a high-temperature superconducting electric suspension magnet. The non-contact current compensation method specifically comprises the steps that zero-flux suspension coils are installed on a ground track at equal intervals in the train running direction; the low-temperature system is composed of an outer Dewar, a radiation screen and a refrigerating machine. The vehicle-mounted superconducting magnet is directly conducted and cooled through a refrigerating machine, and the vehicle-mounted power generation coil and the vehicle-mounted excitation coil are installed on the outer side and the inner side of the outer Dewar respectively. The surface of the radiation screen is provided with a high-temperature superconducting tape, and two ends are connected with a vehicle-mounted superconducting magnet to form a closed loop. When a train runs, the vehicle-mounted superconducting magnet induces current in the suspension coil, the vehicle-mounted power generation coil generates power by using a harmonic magnetic field of the suspension coil, the vehicle-mounted excitation coil generates a traveling wave magnetic field and induces voltage on the high-temperature superconducting strip, and based on the magnetic flux quantum coupling theory, the induced voltage has a direct-current component. The vehicle-mounted superconducting magnet is excited, and attenuation of magnet current is compensated. According to the invention, efficient and stable non-contact direct current compensation of the vehicle-mounted superconducting magnet is realized.

Description

Technical Field

[0001] The present invention belongs to the field of rail transportation, and in particular relates to a non-contact current compensation method for a high-temperature superconducting electric suspension magnet. Background Art

[0002] Superconducting electric levitation technology has achieved manned travel at 603 km / h, becoming a core technological solution for breaking the speed limitations of traditional wheel-rail systems. High-temperature superconducting electric levitation systems, with their unique self-stabilizing suspension characteristics, high buoyancy-to-drag ratio, large suspension gaps exceeding 100 mm, and lower cooling costs compared to low-temperature superconducting systems, are leading the technological transformation of next-generation ultra-high-speed rail transportation.

[0003] Efficient and reliable power supply technology is the key guarantee for achieving stable suspension and safe operation of superconducting electric suspension systems.

[0004] Traditional contact power supply solutions, including pantograph-catenary systems and third-rail power supply systems, face many technical bottlenecks when applied to ultra-high-speed superconducting electric suspension: mechanical wear leads to high maintenance costs, unstable electrical contact during high-speed operation, and the negative correlation between current collection quality and speed.

[0005] Several contactless power supply solutions have been proposed, but they still have significant technical limitations. Specifically, Patent 202310419835.X proposes a generator-type high-temperature superconducting magnet excitation and compensation method based on the flux pump principle. While this solution can achieve contactless power supply for the loaded high-temperature superconducting magnet, the receiving coil is located inside a metal cryogenic container, severely shielding the track coil's magnetic field, resulting in low power supply efficiency. Patent 202211240533.8 discloses a dewar-wall excitation structure that enhances magnetic coupling by introducing a magnetic yoke. However, when this structure is applied to an electric levitation system, the magnetic yoke distorts the magnetic field of the onboard magnet, thereby affecting the train's levitation and guidance performance. Patent 202211343984.4 proposes a superconducting closed-loop operating magnet device based on an excitation power supply. This device requires an external power supply, and the iron core magnetic concentrating material used also distorts the magnetic field of the onboard magnet. Patent 202020862229.7 developed a contactless power supply device suitable for full-speed operation of maglev trains, but its application scope is limited to powering on-board AC equipment and cannot meet the DC current compensation requirements of on-board magnets. Summary of the Invention

[0006] This invention aims to address the inherent drawbacks of traditional contact-based power supply, such as mechanical wear and unstable electrical contact, by combining zero-flux levitation technology with the principles of a superconducting flux pump. This overcomes the technical bottleneck of low efficiency in existing contactless power supply solutions and enables efficient and stable contactless DC current compensation for on-board superconducting magnets. To this end, the invention provides a contactless current compensation method for high-temperature superconducting electric levitation magnets.

[0007] The invention discloses a non-contact current compensation method for a high-temperature superconducting electric levitation magnet, which adopts a system comprising a zero-flux levitation coil, a vehicle-mounted generating coil, a vehicle-mounted exciting coil, a vehicle-mounted superconducting magnet and a cryogenic system.

[0008] The zero-flux suspension coils are installed on the ground track at equal intervals along the direction of train travel; the on-board generating coils, on-board excitation coils, on-board superconducting magnets and cryogenic systems are installed on both sides of the train bogie.

[0009] The cryogenic system consists of an external cryostat, a radiation screen and a refrigerator; the on-board superconducting magnet is cooled by direct conduction of the refrigerator, and the on-board generating coil and the on-board excitation coil are installed on the outside and inside of the external cryostat respectively; high-temperature superconducting tapes are arranged in parallel on the surface of the radiation screen, and the two ends of the high-temperature superconducting tapes are connected to the on-board superconducting magnet, forming a closed loop with the on-board superconducting magnet.

[0010] When the train is running, the on-board superconducting magnet induces current in the suspension coil, the on-board generator coil generates electricity using the harmonic magnetic field of the suspension coil, and the on-board excitation coil generates a traveling wave magnetic field and induces voltage on the high-temperature superconducting tape arranged on the radiation screen. Based on the theory of magnetic flux quantum coupling, the induced voltage has a DC component, which will excite the on-board superconducting magnet and compensate for the attenuation of the magnet current.

[0011] Furthermore, the onboard generator coil is in the shape of an '8', and the upper and lower rings are of different sizes; the onboard generator coil is connected in series with the onboard excitation coil, and the onboard generator coil will power the onboard excitation coil to generate a traveling wave magnetic field along the direction of train movement.

[0012] Furthermore, the on-board generating coil and the on-board excitation coil are both flat.

[0013] Furthermore, the outer dewar has six surfaces, wherein the surface close to the track side is the outer dewar working surface, and the on-board generating coil and the on-board excitation coil are installed on the outer side and the inner side of the outer dewar working surface.

[0014] Furthermore, the radiation shield has six surfaces, the surface close to the track side is the working surface of the radiation shield, and the high-temperature superconducting tape is arranged on the working surface of the radiation shield; the length direction of the high-temperature superconducting tape is perpendicular to the direction of train operation, and the width direction of the high-temperature superconducting tape is parallel to the direction of train operation.

[0015] Furthermore, an adjustable resistor is set in series between the on-board generating coil and the on-board excitation coil, and the adjustable resistor is located outside the low-temperature container; by adjusting the resistance value of the adjustable resistor, the current of the on-board excitation coil and the intensity of the traveling wave magnetic field generated are controlled, and then the DC voltage component at both ends of the high-temperature superconducting tape is regulated to achieve compensation control of the working current of the superconducting magnet.

[0016] Furthermore, the on-board superconducting magnet is first initially excited by an external DC power supply through the current lead; after the initial excitation is completed, the DC power supply is disconnected, so that the on-board superconducting magnet enters a closed-loop operation mode; during the operation of the train, the current attenuation of the superconducting magnet is compensated through the coupling effect between the on-board excitation coil and the high-temperature superconducting tape arranged on the radiation screen.

[0017] Furthermore, the cross-section of the ground track is U-shaped; the zero-flux suspension coil is in an '8' shape, and the zero-flux suspension coils on both sides of the U-shaped track are cross-connected laterally; the zero-flux suspension coil adopts one of a closed-loop operation mode or a series operation mode with an external power supply.

[0018] Furthermore, the suspension coil, the on-board power generation coil and the on-board excitation coil are all wound with superconductors; and the on-board superconducting magnet is wound with high-temperature superconducting tapes.

[0019] Furthermore, the outer dewar is made of aluminum alloy or stainless steel; the radiation screen is made of copper or aluminum alloy; a horizontal support rod is provided between the on-board superconducting magnet and the outer dewar, and the horizontal support rod is made of epoxy material.

[0020] The beneficial technical effects of the present invention are:

[0021] The present invention achieves precise control of the excitation current through an adjustable resistor connected in series between the generating coil and the excitation coil, thereby controlling the amplitude of the traveling wave magnetic field of the excitation coil, the DC voltage component of the superconducting tape, and the current of the superconducting magnet. The outer dewar of the present invention is made of aluminum alloy or stainless steel. Its surface close to the track is designated as the working surface. The generating coil is installed on the outside of this surface, and the excitation coil is installed on the inside. The radiation shield also has a working surface, and its outer surface is arranged with parallel high-temperature superconducting tapes that have been insulated. The length of the tape is perpendicular to the direction of train travel, and the width is parallel to the direction of travel. The two ends of the tape are connected to the input and output terminals of the superconducting magnet to form a closed loop.

[0022] The generator coil, designed in an asymmetric figure-8 configuration, is electrically connected in series with the excitation coil to provide AC excitation. Under the combined influence of the superconducting magnet's self-field and the traveling magnetic field of the excitation coil, the parallel superconducting tape generates an induced voltage with a DC component, which continuously charges the superconducting magnet to compensate for current decay. By optimizing the magnetic field coupling path (generator coil-excitation coil-superconducting tape-superconducting magnet), this invention achieves efficient contactless energy transfer, avoiding the electromagnetic shielding issues associated with conventional metal dewars. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the system structure adopted by the non-contact current compensation method of the high-temperature superconducting electric suspension magnet of the present invention.

[0024] Figure 2 This is the three-dimensional structure of the vehicle-mounted high-temperature superconducting magnet and track coil of the present invention.

[0025] Figure 3 It is a side view of the vehicle-mounted high-temperature superconducting magnet and track coil of the present invention.

[0026] Figure 4 This is a top view of the vehicle-mounted high-temperature superconducting magnet and track coil of the present invention.

[0027] Figure 5 This is a plan view of the high-temperature superconducting tape arranged on the radiation screen of the present invention.

[0028] Figure 6 It is an electromagnetic coupling equivalent circuit among the track coil, the vehicle-mounted generating coil, the excitation coil and the parallel high-temperature superconducting tapes of the present invention.

[0029] In the figure: 1. Refrigerator, 2. First-stage cold head of refrigerator, 3. Second-stage cold head of refrigerator, 4. External cryostat, 4a. Working surface of external cryostat, 5. Radiation shield, 5a. Working surface of radiation shield, 6. Inlet or outlet of high-temperature superconducting coil, 7. High-temperature superconducting tape, 8. On-board generator coil, 8a. Upper ring of generator coil, 8b. Lower ring of generator coil, 9. On-board excitation coil, 10a. Inner propulsion coil, 10b. Outer propulsion coil, 11. Suspension coil, 11a. Upper ring of suspension coil, 11b. Lower ring of suspension coil, 12. Sealing flange, 13. Support rod, 14. Coil box, 15. High-temperature superconducting coil, 16. Welded joint of high-temperature superconducting tape, 17. Equivalent circuit of suspension coil, 18. Equivalent circuit of generator coil and excitation coil in series, 19. Equivalent circuit of high-temperature superconducting tape and high-temperature superconducting coil in parallel. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0031] The system used in the present invention is as follows Figure 1As shown, it includes a zero-flux suspension coil, an on-board generating coil 8, an on-board excitation coil 9, an on-board superconducting magnet and a cryogenic system.

[0032] The zero-flux suspension coils are installed on the ground track at equal intervals along the train running direction; the on-board generating coils 8, on-board excitation coils 9, on-board superconducting magnets and cryogenic systems are installed on both sides of the train bogie.

[0033] Low temperature systems such as Figure 3 As shown, it consists of an outer cryostat 4, a radiation shield 5 and a refrigerator 1; the on-board superconducting magnet is directly cooled by conduction by the refrigerator 1, and the on-board generating coil 8 and the on-board excitation coil 9 are respectively installed on the outer side and the inner side of the outer cryostat 4; the surface of the radiation shield 5 is arranged with high-temperature superconducting tapes 7 connected in parallel, and the two ends of the high-temperature superconducting tapes 7 are connected to the on-board superconducting magnet, forming a closed loop with the on-board superconducting magnet.

[0034] The present invention provides a non-contact current compensation method for a high-temperature superconducting electric levitation magnet. When a train is running, the on-board superconducting magnet induces current in the levitation coil 11. The on-board generating coil 8 generates electricity using the harmonic magnetic field of the levitation coil 11. The on-board excitation coil 9 generates a traveling wave magnetic field and induces a voltage on the high-temperature superconducting tape 7 arranged on the radiation screen 5. Based on the theory of magnetic flux quantum coupling, the induced voltage has a DC component, which will excite the on-board superconducting magnet to compensate for the attenuation of the magnet current.

[0035] Traditional contactless power supply methods achieve contactless energy transfer from the track coil to the receiving coil via electromagnetic coupling between the track coil and the receiving coil inside the cryogenic container. However, due to the large air gap of the electric levitation train and the electromagnetic shielding effect of the metal components of the cryogenic container, the efficiency of this traditional power supply method is significantly reduced.

[0036] The present invention uses a generator coil placed on the outer wall of the cryogenic container to receive energy from the track coil and transmit the energy to the excitation coil inside the container. This transmission method has the following advantages:

[0037] (1) Shorten the electromagnetic coupling air gap between the track coil and the onboard generator coil to improve energy transmission efficiency;

[0038] (2) An excitation coil is installed inside the cryogenic container, which realizes direct energy transmission through electrical connection with the generator coil, completely avoiding the electromagnetic shielding effect of the external dewar.

[0039] Further, such as Figure 1 As shown, the onboard generating coil 8 is in the shape of an '8', and the upper and lower rings are of different sizes; the onboard generating coil 8 is connected in series with the onboard excitation coil 9, and the onboard generating coil 8 will power the onboard excitation coil 9 to generate a traveling wave magnetic field along the direction of the train.

[0040] Further, such as Figure 3 As shown, the vehicle-mounted generating coil 8 and the vehicle-mounted excitation coil 9 are both flat.

[0041] Furthermore, the outer dewar 4 has six surfaces, of which the surface close to the track side is the outer dewar working surface 4a, and the onboard generating coil 8 and the onboard excitation coil 9 are installed on the outer side and inner side of the outer dewar working surface 4a;

[0042] Furthermore, the radiation shield 5 has six surfaces, the surface close to the track side is the radiation shield working surface 5a, and the high-temperature superconducting tape 7 is arranged on the radiation shield working surface 5a; the length direction of the high-temperature superconducting tape 7 is perpendicular to the direction of train operation, and the width direction of the high-temperature superconducting tape 7 is parallel to the direction of train operation.

[0043] Furthermore, an adjustable resistor is arranged in series between the on-board generating coil 8 and the on-board excitation coil 9, and the adjustable resistor is located outside the low-temperature container; by adjusting the resistance value of the adjustable resistor, the current of the on-board excitation coil 9 and the intensity of the traveling wave magnetic field generated are controlled, and then the DC voltage component at both ends of the high-temperature superconducting tape 7 is regulated to realize compensation control of the working current of the superconducting magnet.

[0044] Furthermore, the on-board superconducting magnet is first initially excited by an external DC power supply through the current lead; after the initial excitation is completed, the DC power supply is disconnected, so that the on-board superconducting magnet enters a closed-loop operation mode; during the operation of the train, the current attenuation of the superconducting magnet is compensated by the coupling effect between the on-board excitation coil 9 and the high-temperature superconducting tape 7 arranged on the radiation screen 5.

[0045] Furthermore, the cross-section of the ground track is U-shaped; the zero-flux suspension coil is in an '8' shape, and the zero-flux suspension coils on both sides of the U-shaped track are cross-connected laterally; the zero-flux suspension coil adopts one of a closed-loop operation mode or a series operation mode with an external power supply.

[0046] Furthermore, the suspension coil 11, the on-board power generation coil 8 and the on-board excitation coil 9 are all wound from superconductors; and the on-board superconducting magnet is wound from high-temperature superconducting tapes.

[0047] Furthermore, the outer dewar 4 is made of aluminum alloy or stainless steel; the radiation screen 5 is made of copper or aluminum alloy; a horizontal support rod 13 is provided between the on-board superconducting magnet and the outer dewar 4, and the horizontal support rod 13 is made of epoxy material.

[0048] The three-dimensional structure of the vehicle-mounted high-temperature superconducting magnet and the track coil of the present invention is as follows Figure 2 As shown, Figure 3 and Figure 4The side and top views are shown, respectively. The onboard superconducting magnet consists of high-temperature superconducting coils 15 and a conduction-cooled cryogenic system. The cryogenic system includes a refrigerator 1, an external cryostat 4, and a radiation shield 5. The refrigerator 1 is mounted on the top surface of the external cryostat 4. Its primary cold head 2 cools the radiation shield 5, while its secondary cold head 3 cools the high-temperature superconducting coils 15.

[0049] like Figure 3 As shown, the high-temperature superconducting coil 15 is encapsulated inside the coil box 14. The coil box 14 is connected to the outer dewar 4 through a support rod 13. The support rod 13 transmits the electromagnetic force of the superconducting coil to the outer dewar 4. The joint between the support rod 13 and the outer dewar 4 is sealed by a sealing flange 12.

[0050] like Figure 3 As shown, the outer dewar 4 has six faces, of which the face closest to the suspension coil is the outer dewar working face 4a. The radiation shield 5 also has six faces, of which the face closest to the suspension coil is the radiation shield working face 5a. The onboard generator coil 8 is arranged outside the outer dewar working face 4a, forming an "8" shape and consisting of an upper generator coil ring 8a and a lower generator coil ring 8b connected in series. The onboard excitation coil 9 is arranged inside the outer dewar working face 4a and is electrically connected to the onboard generator coil 8, with its connecting wires passing through the top surface of the outer dewar 4.

[0051] like Figure 4 As shown, the suspension coils 11 are continuously arranged at equal intervals along the length direction of the superconducting magnet, and are in the shape of an '8' and are composed of a suspension coil upper ring 11a and a suspension coil lower ring 11b connected in series (see Figure 3 ); the propulsion coil is runway-shaped and continuously arranged at equal intervals along the length direction of the superconducting magnet, and is composed of an inner propulsion coil 10a and an outer propulsion coil 10b.

[0052] Figure 5 This is a plan view of the high-temperature superconducting tapes arranged on the radiation shield according to the present invention. Parallel high-temperature superconducting tapes 7 are evenly spaced outside the radiation shield's working surface 5a and insulated with polyimide tape. The ends of the parallel high-temperature superconducting tapes 7 are welded to the inlet 6a and outlet 6b of the high-temperature superconducting coil 15, respectively. The welded joints are labeled 16.

[0053] Figure 6 The electromagnetic coupling equivalent circuit diagram of the present invention is shown in FIG. E is the back electromotive force generated by the superconducting coil 15 in the suspension coil 11 during train operation; R1 is the resistance of the suspension coil 11; I1 is the current of the suspension coil 11; R2 is the adjustable resistance connected in series between the generating coil 8 and the excitation coil 9; I2 is the current of the excitation coil 9; R s is the dynamic resistance of the parallel high-temperature superconducting tape 7; R3 is the loop resistance of the high-temperature superconducting coil 15 (mainly the joint resistance); L3 is the inductance of the high-temperature superconducting coil 15; and I3 is the current of the high-temperature superconducting coil 15.

[0054] During train operation, the interaction between the propulsion coils 10 and the superconducting coils 15 generates electromagnetic thrust, propelling the train forward. The magnetic field of the superconducting coils 15 cuts through the levitation coils 11, generating an induced electromotive force E and a current I1. This current generates a traveling magnetic field, which acts on the superconducting coils 15 to generate levitation and guiding forces, achieving both levitation and guidance of the train.

[0055] Because the suspension coils 11 are discretely arranged, their magnetic fields contain spatial harmonics. Generator coils 8 utilize these harmonics to generate electricity, which then powers excitation coils 9, causing them to generate a traveling magnetic field along the train's direction of travel. This magnetic field excites the parallel high-temperature superconducting strips 7 arranged on the radiation shield's working surface 5a, generating an induced voltage. Based on the theory of magnetic flux quantum coupling, this induced voltage contains a non-zero DC component, creating a DC voltage difference across the parallel high-temperature superconducting strips 7 (i.e., the input and output terminals 6a and 6b of the high-temperature superconducting coils 15).

[0056] exist Figure 5 In the equation, V1 is the potential of the incoming terminal 6a, and V2 is the potential of the outgoing terminal 6b. Figure 6 The superconducting coil current I3 = (V1 - V2) / R3. Clearly, I3 is proportional to the voltage difference (V1 - V2). By adjusting the series resistor R2 between the generator coil 8 and the excitation coil 9, the current I2 in the equivalent circuit 18 can be controlled, thereby regulating the magnitude of (V1 - V2).

[0057] Flux quantum coupling theory: When a high-temperature superconducting tape is subjected to a traveling wave magnetic field containing both DC and AC components, a dynamic DC voltage response will be generated.

[0058] In the present invention, the excitation coil 9 (installed inside the outer Dewar working surface 4a) generates a traveling wave magnetic field that propagates along the direction of train operation; the superconducting coil 15 (encapsulated in the coil box 14) provides a static DC background magnetic field.

[0059] The combined effect of the above magnetic fields generates a DC voltage at both ends of the parallel high-temperature superconducting tapes 7 arranged on the working surface 5 a of the radiation shield, and this voltage performs current compensation on the superconducting coil 15 .

[0060] The present invention innovatively adopts the collaborative design of external generating coils and internal excitation coils, and realizes efficient compensation of superconducting magnet current by optimizing the electromagnetic coupling path, effectively solving the efficiency bottleneck problem of traditional power supply methods and providing a reliable magnet excitation solution for high-temperature superconducting electric suspension systems.

Claims

1. A non-contact current compensation method for a high-temperature superconducting electric levitation magnet, characterized in that: The system used includes a zero-flux suspension coil, an on-board generating coil (8), an on-board excitation coil (9), an on-board superconducting magnet and a cryogenic system; The zero-flux suspension coils are installed on the ground track at equal intervals along the train running direction; the on-board generating coils (8), the on-board excitation coils (9), the on-board superconducting magnets and the cryogenic system are installed on both sides of the train bogie; The cryogenic system is composed of an outer dewar (4), a radiation screen (5) and a refrigerator (1); the on-board superconducting magnet is directly cooled by conduction by the refrigerator (1); the on-board generating coil (8) and the on-board excitation coil (9) are respectively installed on the outer side and the inner side of the outer dewar (4); high-temperature superconducting strips (7) are arranged in parallel on the surface of the radiation screen (5); the two ends of the high-temperature superconducting strips (7) are connected to the on-board superconducting magnet, forming a closed loop with the on-board superconducting magnet; When the train is running, the onboard superconducting magnet induces current in the suspension coil (11), the onboard generating coil (8) generates electricity using the harmonic magnetic field of the suspension coil (11), and the onboard excitation coil (9) generates a traveling wave magnetic field and induces voltage on the high-temperature superconducting strip (7) arranged on the radiation screen (5). Based on the magnetic flux quantum coupling theory, the induced voltage has a DC component, which will excite the onboard superconducting magnet and compensate for the attenuation of the magnet current.

2. The non-contact current compensation method of a high-temperature superconducting electric levitation magnet according to claim 1, characterized in that: The on-board generating coil (8) is in the shape of an '8', and the upper and lower rings are of different sizes; the on-board generating coil (8) is connected in series with the on-board excitation coil (9), and the on-board generating coil (8) supplies power to the on-board excitation coil (9), so that the on-board excitation coil (9) generates a traveling wave magnetic field along the running direction of the train.

3. The non-contact current compensation method of a high-temperature superconducting electric levitation magnet according to claim 2, characterized in that: The vehicle-mounted generating coil (8) and the vehicle-mounted excitation coil (9) are both flat.

4. The non-contact current compensation method for a high-temperature superconducting electric levitation magnet according to claim 1, characterized in that: The outer dewar (4) has six surfaces, wherein the surface close to the track side is the outer dewar working surface (4a), and the onboard generating coil (8) and the onboard excitation coil (9) are installed on the outer side and the inner side of the outer dewar working surface (4a); The radiation screen (5) has six surfaces, the surface close to the track side is the radiation screen working surface (5a), and the high-temperature superconducting tape (7) is arranged on the radiation screen working surface (5a); the length direction of the high-temperature superconducting tape (7) is perpendicular to the train running direction, and the width direction of the high-temperature superconducting tape (7) is parallel to the train running direction.

5. The non-contact current compensation method for a high-temperature superconducting electric levitation magnet according to claim 1, characterized in that: An adjustable resistor is connected in series between the on-board generating coil (8) and the on-board excitation coil (9), and the adjustable resistor is located outside the cryogenic container; by adjusting the resistance value of the adjustable resistor, the current of the on-board excitation coil (9) and the intensity of the generated traveling wave magnetic field are controlled, thereby regulating the DC voltage component at both ends of the high-temperature superconducting tape (7), thereby achieving compensation control of the working current of the superconducting magnet.

6. The non-contact current compensation method for a high-temperature superconducting electric levitation magnet according to claim 5, characterized in that: The on-board superconducting magnet is first initially excited by an external DC power supply via a current lead; after the initial excitation is completed, the DC power supply is disconnected, so that the on-board superconducting magnet enters a closed-loop operation mode; during the operation of the train, the current attenuation of the superconducting magnet is compensated through the coupling effect between the on-board excitation coil (9) and the high-temperature superconducting tape (7) arranged on the radiation screen (5).

7. The non-contact current compensation method for a high-temperature superconducting electric levitation magnet according to claim 1, characterized in that: The cross-section of the ground track is U-shaped; The zero-flux suspension coils are in the shape of an '8', and the zero-flux suspension coils on both sides of the U-shaped track are cross-connected laterally; The zero-flux suspension coil adopts a closed-loop operation mode or a series operation mode with an external power supply.

8. The non-contact current compensation method for a high-temperature superconducting electric levitation magnet according to claim 1, characterized in that: The suspension coil (11), the on-board power generation coil (8) and the on-board excitation coil (9) are all wound from superconductors; and the on-board superconducting magnet is wound from high-temperature superconducting tapes.

9. The non-contact current compensation method for a high-temperature superconducting electric levitation magnet according to claim 1, characterized in that: The outer dewar (4) is made of aluminum alloy or stainless steel; the radiation screen (5) is made of copper or aluminum alloy; a horizontal support rod (13) is provided between the on-board superconducting magnet and the outer dewar (4), and the support rod (13) is made of epoxy material.

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