Magnetic levitation wind turbine with eddy current coupling function

Abstract

The application discloses a magnetic suspension wind turbine with eddy current coupling function and relates to the technical field of wind power generation. The magnetic suspension wind turbine comprises coaxially arranged motor rotating shafts and transmission rotating shafts, wherein the motor rotating shafts and the transmission rotating shafts are transmissionally connected through an eddy current coupling device, one end of the motor rotating shaft away from the eddy current coupling device is connected with a power generation assembly, and one end of the transmission rotating shaft away from the eddy current coupling device is provided with a blade assembly; a magnetic suspension device is arranged at the middle part of the transmission rotating shaft, and the magnetic suspension device is used for keeping the transmission rotating shaft in a suspended state; wherein the magnetic suspension device comprises a rotor assembly and a stator assembly, and a first gap is left between the stator assembly and the rotor assembly. The technical scheme provided by the application can reduce the starting wind speed of the wind turbine and improve the output power of the wind turbine.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, and in particular to a magnetic levitation wind turbine generator set with eddy current coupling function. Background Technology

[0002] Wind energy is clean, environmentally friendly, and renewable, and its wide geographical distribution makes it a promising new energy source. Wind energy is harvested using wind turbine generators. Driven by wind, the blade assembly drives the generator assembly via a motor shaft to generate electricity. In existing technology, the motor shaft is mounted inside the wind turbine generator via mechanical bearings. Because the motor shaft is subjected to the downward gravity of the blade assembly, it generates a non-axial force on the bearing, resulting in uneven stress on the bearing. Combined with the weight of the motor shaft itself, this generates significant friction, requiring higher wind speeds to start the generator assembly. Furthermore, the wind turbine generator's output power decreases during operation due to the need to overcome internal resistance. Therefore, there is an urgent need for methods to reduce the starting wind speed of wind turbine generators and increase their output power.

[0003] It should be noted that the above content is only used to help understand the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main objective of this invention is to propose a magnetic levitation wind turbine generator with eddy current coupling function, which aims to reduce the starting wind speed of the wind turbine generator and increase the output power of the wind turbine generator.

[0005] To achieve the above objectives, this invention proposes a magnetic levitation wind turbine generator set with eddy current coupling function; specifically, the magnetic levitation wind turbine generator set includes:

[0006] A motor shaft and a transmission shaft are coaxially arranged, wherein the motor shaft and the transmission shaft are connected by an eddy current coupling device. The end of the motor shaft away from the eddy current coupling device is connected to a power generation component, and the end of the transmission shaft away from the eddy current coupling device is provided with a blade assembly.

[0007] A magnetic levitation device is disposed in the middle of a transmission shaft, and is used to levitate the transmission shaft. The magnetic levitation device includes a rotor assembly and a stator assembly. The rotor assembly is a cylindrical structure and has magnetic or conductive magnetic properties. The rotor assembly is fixedly sleeved in the middle of the transmission shaft. The stator assembly has magnetic or conductive magnetic properties and is symmetrically disposed on the upper and lower sides of the rotor assembly, with a first gap between the stator assembly and the rotor assembly.

[0008] In one embodiment, the eddy current coupling device includes a first permanent disk and a second permanent disk symmetrically arranged, and a conductor disk disposed between the first permanent disk and the second permanent disk, with a second gap between the conductor disk and the first permanent disk and the second permanent disk;

[0009] The first permanent disk and the second permanent disk are connected to each other by a connecting rod arranged along their circumference. The shaft end of the first permanent disk is fixedly connected to the transmission shaft, and the shaft core of the second permanent disk is provided with a through hole for the motor shaft to pass through, so that the motor shaft is fixedly connected to the shaft end of the conductor disk.

[0010] In one embodiment, permanent magnets are fixedly disposed on the side of the first permanent disk and the second permanent disk facing the conductor disk, and the conductor disk is provided with a magnetic conductor; when the first permanent disk and the second permanent disk rotate, the induced magnetic field generated by the permanent magnets on both sides passes through the second gap and acts on the magnetic conductor, thereby causing the conductor disk to rotate accordingly.

[0011] In one embodiment, the connecting rod is slidably connected to the first permanent disk and the second permanent disk; the two ends of the connecting rod are provided with first limiting members, which abut against the first permanent disk or the second permanent disk; by sliding the first permanent disk or the second permanent disk along the connecting rod, the second gap width between the first permanent disk and the conductor disk, and the second gap width between the second permanent disk and the conductor disk are adjusted.

[0012] In one embodiment, the eddy current coupling device includes a synchronization adjustment component, which is used to make the second gap width between the first permanent disk and the conductor disk equal to the second gap width between the second permanent disk and the conductor disk.

[0013] In one embodiment, the synchronization adjustment assembly includes a housing with a cavity structure. A gear is rotatably connected inside the housing, and a first adjusting rod and a second adjusting rod are slidably connected. Both the first and second adjusting rods have rack structures on their sides. The first and second adjusting rods are respectively located on opposite sides of the gear, and are meshed with the gear through the rack structures. One end of the first adjusting rod extends to the outside of the housing and is fixedly connected to the first permanent magnet disk. One end of the second adjusting rod extends to the outside of the housing and is fixedly connected to the second permanent magnet disk.

[0014] In one embodiment, a second limiting member is provided at the other end of both the first adjusting rod and the second adjusting rod, and the second limiting member abuts against the gear component.

[0015] In one embodiment, the flow coupling device includes at least four of the synchronization adjustment components, which are equidistantly arranged circumferentially along the first permanent disk or the second permanent disk; and / or, the flow coupling device includes at least four of the connecting rods, which are equidistantly arranged circumferentially along the first permanent disk or the second permanent disk.

[0016] In one embodiment, a first bushing is fixedly connected to the shaft end of the first permanent magnet disk, the first bushing being used to fix the end of the transmission shaft; and / or, a second bushing is fixedly connected to the shaft end of the conductor disk, the second bushing being used to fix the end of the motor shaft.

[0017] In one embodiment, the axial direction of the transmission shaft from the eddy current coupling device to the blade assembly is defined as a first direction; the stator assembly includes a first electromagnetic assembly, a second electromagnetic assembly, a third electromagnetic assembly, and a fourth electromagnetic assembly arranged sequentially along the first direction; the end faces of the first electromagnetic assembly and the fourth electromagnetic assembly are parallel to the end face of the rotor assembly; the end face of the second electromagnetic assembly and the end face of the rotor assembly gradually increase along the first direction, and the end face of the third electromagnetic assembly and the end face of the rotor assembly gradually decrease along the first direction.

[0018] The technical solution of this invention, on the one hand, uses a magnetic levitation device to suspend and rotate the transmission shaft without mechanical contact, completely eliminating the static friction caused by traditional mechanical bearings and the off-center load resistance caused by the gravity of the blade assembly. This significantly reduces the starting resistance of the transmission system, allowing for smooth startup even in light winds, thereby significantly widening the usable wind speed range. Specifically, the magnetic levitation device symmetrically arranges the stator assembly above and below the rotor assembly, forming a closed-loop magnetic force that automatically counteracts the overturning torque generated by the gravity of the blade assembly, keeping the transmission shaft in a balanced position at all times. This ensures uniform stress on the shaft system and avoids fatigue damage caused by off-center loads in traditional bearings. On the other hand, by incorporating an eddy current coupling device, the magnetic field is used as a medium to transmit torque, ensuring that the wind energy captured by the blade assembly can be sequentially transferred to the power generation assembly through the transmission shaft and motor shaft without contact, significantly reducing additional energy dissipation during the energy transfer process. The combination of these two aspects reduces the starting wind speed of the wind turbine generator and increases its output power. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a structure of an embodiment of a magnetic levitation wind turbine generator provided by the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the first permanent magnet disk and the second permanent magnet disk in one embodiment of the magnetic levitation wind turbine generator provided by the present invention.

[0022] Figure 3 This is a schematic diagram of the synchronous adjustment component in one embodiment of the magnetic levitation wind turbine generator provided by the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 100. Motor shaft; 200. Transmission shaft; 300. Eddy current coupling device; 310. First permanent magnet disk; 311. Permanent magnet; 312. First shaft collar; 320. Second permanent magnet disk; 321. Through hole; 330. Conductor disk; 331. Magnetic conductor; 332. Second shaft collar; 340. Connecting rod; 341. First limiting member; 350. Second gap; 360. Synchronous adjustment assembly; 361. Housing; 362. Gear component; 363. First adjusting rod; 364. Second adjusting rod; 365. Rack structure; 366. Second limiting member; 400. Blade assembly; 500. Magnetic levitation device; 510. Rotor assembly; 520. Stator assembly; 521. First electromagnetic assembly; 522. Second electromagnetic assembly; 523. Third electromagnetic assembly; 524. Fourth electromagnetic assembly; 530. First gap;

[0025] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a portion of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0027] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, it should be noted that the descriptions involving "first," "second," etc., in this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0029] In the existing technology, the motor shaft is installed inside the wind turbine generator through mechanical bearings. Because the motor shaft is subjected to the downward gravity of the blade assembly, it generates a non-axial force on the bearing, resulting in an uneven force on the bearing. In addition, the weight of the motor shaft itself generates a large frictional force, which requires a large wind speed to start the power generation components. At the same time, the output power of the wind turbine generator is reduced due to the need to overcome its internal resistance during operation.

[0030] To address the aforementioned technical problems, this invention proposes a magnetic levitation wind turbine generator set with eddy current coupling function.

[0031] Please see Figures 1 to 3 In one embodiment of the present invention, the magnetic levitation wind turbine generator set includes:

[0032] A motor shaft 100 and a transmission shaft 200 are coaxially arranged. The motor shaft 100 and the transmission shaft 200 are connected by an eddy current coupling device 300. The end of the motor shaft 100 away from the eddy current coupling device 300 is connected to a power generation component (not shown in the figure). The end of the transmission shaft 200 away from the eddy current coupling device 300 is provided with a blade assembly 400.

[0033] A magnetic levitation device 500 is disposed in the middle of the transmission shaft 200 and is used to levitate the transmission shaft 200. The magnetic levitation device 500 includes a rotor assembly 510 and a stator assembly 520. The rotor assembly 510 is configured as a cylindrical structure and has magnetic or conductive magnetic properties. The rotor assembly 510 is fixedly sleeved in the middle of the transmission shaft 200. The stator assembly 520 has magnetic or conductive magnetic properties and is symmetrically disposed on the upper and lower sides of the rotor assembly 510. A first gap 530 is left between the stator assembly 520 and the rotor assembly 510.

[0034] The technical solution of the present invention, on the one hand, enables the transmission shaft 200 to suspend and rotate in a state of no mechanical contact by setting a magnetic levitation device 500, thus completely eliminating the static friction caused by traditional mechanical bearings and the off-center load resistance caused by the gravity of the blade assembly 400. The starting resistance of the transmission system is thus significantly reduced, allowing for smooth startup even in light wind conditions, thereby significantly widening the range of usable wind speeds. Specifically, the magnetic levitation device 500 symmetrically arranges the stator assembly 520 above and below the rotor assembly 510, forming a closed-loop magnetic force that automatically counteracts the overturning torque generated by the gravity of the blade assembly 400, keeping the transmission shaft 200 in a balanced position at all times. This ensures uniform stress on the shaft system and avoids fatigue damage caused by uneven loading of traditional bearings. On the other hand, by setting up an eddy current coupling device 300, torque is transmitted through a magnetic field, ensuring that the wind energy captured by the blade assembly 400 can be transmitted to the power generation assembly sequentially through the transmission shaft 200 and the motor shaft 100 without contact, significantly reducing additional energy dissipation during the energy transfer process. The combination of these two factors reduces the starting wind speed of the wind turbine generator set and increases its output power.

[0035] As a preferred embodiment of the above, the eddy current coupling device 300 includes a first permanent disk 310 and a second permanent disk 320 symmetrically arranged, and a conductor disk 330 disposed between the first permanent disk 310 and the second permanent disk 320, with a second gap 350 between the conductor disk 330 and the first permanent disk 310 and the second permanent disk 320; the first permanent disk 310 and the second permanent disk 320 are connected to each other by a connecting rod 340 arranged along their circumference, wherein the shaft end of the first permanent disk 310 is fixedly connected to the transmission shaft 200, and the shaft core of the second permanent disk 320 is provided with a through hole 321, which is used for the motor shaft 100 to pass through, so that the motor shaft 100 is fixedly connected to the shaft end of the conductor disk 330. With this configuration, the first permanent magnetic disk 310 and the second permanent magnetic disk 320 are placed on both sides of the conductor disk 330, forming a double-sided magnetic field loop, which enables eddy current coupling to obtain a larger effective magnetic flux under the same air gap, thereby enhancing the torque transmission capability; at the same time, the connecting rod 340 connects the first permanent magnetic disk 310 and the second permanent magnetic disk 320 into one unit to ensure synchronous rotation; thus realizing a pure torque, non-contact flexible connection between the transmission shaft 200 and the motor shaft 100.

[0036] Specifically, permanent magnets 311 are fixedly disposed on the side of the first permanent magnet disk 310 and the second permanent magnet disk 320 facing the conductor disk 330, and a magnetic conductor 331 is disposed on the conductor disk 330. When the first permanent magnet disk 310 and the second permanent magnet disk 320 rotate, the induced magnetic field generated by the permanent magnets 311 on both sides passes through the second gap 350 and acts on the magnetic conductor 331, thereby causing the conductor disk 330 to rotate accordingly. With this configuration, by limiting the permanent magnets 311 to be attached to the first permanent magnet disk 310 / second permanent magnet disk 320 and the magnetic conductor 331 to be embedded in the conductor disk 330, the induced magnetic field generated by the permanent magnets 311 on both sides passes perpendicularly through the second gap 350 during rotation, forming dense eddy currents in the magnetic conductor 331. The magnetic field-eddy current interaction is more complete, which can maintain stable output within a wider slip range, so that the blade assembly 400 can continue to drive the power generation assembly efficiently even when the wind speed fluctuates.

[0037] Furthermore, the connecting rod 340 is slidably connected to the first permanent disk 310 and the second permanent disk 320; the two ends of the connecting rod 340 are provided with first limiting members 341, which abut against the first permanent disk 310 or the second permanent disk 320; by sliding the first permanent disk 310 or the second permanent disk 320 along the connecting rod 340, the width of the second gap 350 between the first permanent disk 310 and the conductor disk 330, and the width of the second gap 350 between the second permanent disk 320 and the conductor disk 330 are adjusted. With this configuration, by making the connecting rod 340 a sliding pair, the first permanent disk 310 and the second permanent disk 320 can move closer to or further away from the conductor disk 330 along the axial direction, thereby changing the width of the second gap 350 online; a smaller gap enhances coupling and speeds up start-up, while a larger gap weakens coupling and protects the system from overload impact, achieving real-time adaptive adjustment of "tight when the wind is strong, loose when the wind is weak," significantly improving operational flexibility. Meanwhile, first limiting members 341 are provided at both ends of the connecting rod 340 to prevent the first permanent magnet disk 310 and the second permanent magnet disk 320 from separating from the connecting rod 340 under extreme working conditions, which would cause the eddy current coupling device 300 to disintegrate.

[0038] As a preferred embodiment of the above embodiments, the eddy current coupling device 300 includes a synchronization adjustment component 360. The synchronization adjustment component 360 is used to ensure that the width of the second gap 350 between the first permanent magnet disk 310 and the conductor disk 330 is equal to the width of the second gap 350 between the second permanent magnet disk 320 and the conductor disk 330. This configuration, by setting the synchronization adjustment component 360, ensures that the second gaps 350 on both sides are always equal, avoiding uneven attraction due to an excessively small gap on one side and wasted magnetic flux due to an excessively large gap on one side. This maintains the axial symmetry of the magnetic field distribution, preventing the rotor from being subjected to additional axial force and ensuring that the eddy current conduction efficiency is always at its optimal state.

[0039] Specifically, the synchronization adjustment assembly 360 includes a housing 361 with a cavity structure. Inside the housing 361, a gear 362 is rotatably connected, and a first adjusting rod 363 and a second adjusting rod 364 are slidably connected. The sides of the first adjusting rod 363 and the second adjusting rod 364 are provided with rack structures 365. The first adjusting rod 363 and the second adjusting rod 364 are respectively disposed on opposite sides of the gear 362, and the first adjusting rod 363 and the second adjusting rod 364 are meshed with the gear 362 through the rack structures 365. One end of the first adjusting rod 363 extends to the outside of the housing 361 and is fixedly connected to the first permanent magnet disk 310, and one end of the second adjusting rod 364 extends to the outside of the housing 361 and is fixedly connected to the second permanent magnet disk 320. With this configuration, the axial displacement of the first adjusting rod 363 is precisely mirrored to the second adjusting rod 364 using the gear-rack mechanism inside the housing 361. The amount that one rod advances is the same amount that the other rod retracts simultaneously, and the mechanical closed loop ensures zero-error equidistant adjustment; thus ensuring that the second gaps 350 on both sides are always equal.

[0040] Furthermore, a second limiting member 366 is provided at the other end of both the first adjusting rod 363 and the second adjusting rod 364. The second limiting member 366 is used to abut against the gear component 362. With this configuration, the second limiting member 366 is provided at the tail end of the first adjusting rod 363 and the second adjusting rod 364, which abuts against the gear component 362 to form a mechanical hard limit. This can prevent the first adjusting rod 363 / second adjusting rod 364 from overextending under extreme working conditions, causing the gear component 362 to disengage from the rack structure 365.

[0041] As a preferred embodiment of the above, the flow coupling device includes at least four synchronous adjustment components 360, which are equidistantly arranged circumferentially around the first permanent disk 310 or the second permanent disk 320; and / or, the flow coupling device includes at least four connecting rods 340, which are equidistantly arranged circumferentially around the first permanent disk 310 or the second permanent disk 320. This arrangement, with at least four sets of synchronous adjustment components 360 and connecting rods 340 equidistantly arranged circumferentially, ensures that the first permanent disk 310 / second permanent disk 320 is uniformly pushed and pulled in the circumferential direction, avoiding local deformation; multi-point support also reduces single-point stress, maintaining disk parallelism even under high torque and strong gusts of wind, ensuring uniform magnetic field gap and stable coupling.

[0042] As a preferred embodiment of the above, a first bushing 312 is fixedly connected to the shaft end of the first permanent magnet disk 310, and the first bushing 312 is used to fix the end of the transmission shaft 200; and / or, a second bushing 332 is fixedly connected to the shaft end of the conductor disk 330, and the second bushing 332 is used to fix the end of the motor shaft 100. With this configuration, the permanent magnet disk is rigidly connected to the transmission shaft 200 and the conductor disk 330 is rigidly connected to the motor shaft 100 via the first bushing 312 and the second bushing 332, respectively. This simplifies axial positioning and avoids stress concentration caused by keyways or pins, resulting in a simple structure and strong practicality.

[0043] As a preferred embodiment of the above, the axial direction of the transmission shaft 200 from the eddy current coupling device 300 to the blade assembly 400 is defined as the first direction; the stator assembly 520 includes a first electromagnetic assembly 521, a second electromagnetic assembly 522, a third electromagnetic assembly 523 and a fourth electromagnetic assembly 524 arranged sequentially along the first direction; the end faces of the first electromagnetic assembly 521 and the fourth electromagnetic assembly 524 are parallel to each other; the end face of the second electromagnetic assembly 522 and the end face of the rotor assembly 510 gradually increase along the first direction, and the end face of the third electromagnetic assembly 523 and the end face of the rotor assembly 510 gradually decrease along the first direction. This configuration divides the stator assembly 520 into four special-shaped sections: the end faces of the two end electromagnetic components (the first electromagnetic component 521 and the fourth electromagnetic component 524) are parallel to the rotor assembly 510, providing the main levitation force; the two middle sections (the second electromagnetic component 522 and the third electromagnetic component 523) have an expanding-contracting conical structure, forming an axial magnetic gradient. When the blade assembly 400 experiences axial displacement due to wind pressure, the conical magnetic field can instantly generate a restoring force, automatically pulling the rotor back to its equilibrium position. This retains radial load-bearing capacity while actively suppressing axial displacement, achieving five-degree-of-freedom stable levitation and further enhancing the adaptability of the magnetic levitation system to strong gusts and impact loads. In addition, by controlling the opening and closing of the second electromagnetic component 522 and the third electromagnetic component 523, an axial driving force can be generated for the transmission shaft 200. Since the transmission shaft 200 is fixedly connected to the first permanent magnet disk 310, the first permanent magnet disk 310 and the second permanent magnet disk 320 can be moved axially towards or away from the conductor disk 330, thereby changing the width of the second gap 350 online.

[0044] Understandably, at low wind speeds, the torque of the blade assembly 400 is limited; if the coupling is too weak, the conductor disk 330 will slip severely, and the power generation assembly cannot be driven. Therefore, by reducing the gap → enhancing magnetic field penetration → increasing eddy currents → improving the transmitted torque. Specifically, by energizing the third electromagnetic assembly 523 separately, its tapered air gap, which gradually decreases along the first direction, will generate an axial component force away from the blade assembly 400 on the end face of the rotor assembly 510, thereby driving the transmission shaft 200 to move towards the eddy current coupling device 300, so that the first permanent magnet disk 310 and the second permanent magnet disk 320 can move axially closer to the conductor disk 330, thereby reducing the width of the second gap 350.

[0045] Under high wind speeds, the combination of high wind speed and strong coupling causes the input torque of the power generation components to exceed the rated value, and the generator current to rise rapidly, which may trigger overcurrent protection shutdown or even burn out power devices. Therefore, by increasing the gap → weakening magnetic field penetration → reducing eddy currents → reducing transmitted torque. Specifically, when the second electromagnetic component 522 is energized separately, its tapered air gap, which gradually increases along the first direction, will generate an axial component force pointing towards the blade assembly 400 side on the end face of the rotor assembly 510, thereby driving the transmission shaft 200 to move away from the eddy current coupling device 300, so that the first permanent magnet disk 310 and the second permanent magnet disk 320 can move away from the conductor disk 330 along the axial direction, thereby increasing the width of the second gap 350.

[0046] It should be noted that the other contents of the magnetic levitation wind turbine generator with eddy current coupling function disclosed in this invention are prior art and will not be described in detail here.

[0047] The above are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. Any application of the present invention directly or indirectly in other related technical fields is included within the patent protection scope of the present invention.

Claims

1. A magnetic levitation wind turbine generator with eddy current coupling function, characterized in that, The magnetic levitation wind turbine generator set includes: A motor shaft and a transmission shaft are coaxially arranged, wherein the motor shaft and the transmission shaft are connected by an eddy current coupling device. The end of the motor shaft away from the eddy current coupling device is connected to a power generation component, and the end of the transmission shaft away from the eddy current coupling device is provided with a blade assembly. A magnetic levitation device is disposed in the middle of a transmission shaft, and is used to levitate the transmission shaft. The magnetic levitation device includes a rotor assembly and a stator assembly. The rotor assembly is a cylindrical structure and has magnetic or conductive magnetic properties, and is fixedly sleeved in the middle of the transmission shaft. The stator assembly has magnetic or conductive magnetic properties, and is symmetrically disposed on the upper and lower sides of the rotor assembly, with a first gap between the stator assembly and the rotor assembly. The axial direction of the transmission shaft from the eddy current coupling device to the blade assembly is defined as the first direction; the stator assembly includes a first electromagnetic assembly, a second electromagnetic assembly, a third electromagnetic assembly, and a fourth electromagnetic assembly arranged sequentially along the first direction; the end faces of the first electromagnetic assembly and the fourth electromagnetic assembly are parallel to the end face of the rotor assembly; the end face of the second electromagnetic assembly and the end face of the rotor assembly gradually increase along the first direction, and the end face of the third electromagnetic assembly and the end face of the rotor assembly gradually decrease along the first direction.

2. The magnetic levitation wind turbine generator set as claimed in claim 1, characterized in that: The eddy current coupling device includes a first permanent disk and a second permanent disk arranged symmetrically, and a conductor disk disposed between the first permanent disk and the second permanent disk, with a second gap between the conductor disk and the first permanent disk and the second permanent disk; The first permanent disk and the second permanent disk are connected to each other by a connecting rod arranged along their circumference. The shaft end of the first permanent disk is fixedly connected to the transmission shaft, and the shaft core of the second permanent disk is provided with a through hole for the motor shaft to pass through, so that the motor shaft is fixedly connected to the shaft end of the conductor disk.

3. The magnetic levitation wind turbine generator set as claimed in claim 2, characterized in that: The first and second permanent disks are fixedly provided with permanent magnets on the side facing the conductor disk, and the conductor disk is provided with a magnetic conductor. When the first and second permanent disks rotate, the induced magnetic field generated by the permanent magnets on both sides passes through the second gap and acts on the magnetic conductor, thereby causing the conductor disk to rotate accordingly.

4. The magnetic levitation wind turbine generator set as claimed in claim 2, wherein: The connecting rod is slidably connected to the first permanent disk and the second permanent disk; the two ends of the connecting rod are provided with first limiting members, which abut against the first permanent disk or the second permanent disk; by sliding the first permanent disk or the second permanent disk along the connecting rod, the second gap width between the first permanent disk and the conductor disk, and the second gap width between the second permanent disk and the conductor disk are adjusted.

5. The magnetic levitation wind turbine generator set as claimed in claim 4, characterized in that: The eddy current coupling device includes a synchronization adjustment component, which is used to make the second gap width between the first permanent disk and the conductor disk equal to the second gap width between the second permanent disk and the conductor disk.

6. The magnetic levitation wind turbine generator set as claimed in claim 5, characterized in that: The synchronization adjustment assembly includes a housing with a cavity structure. Inside the housing, a gear is rotatably connected, and a first adjusting rod and a second adjusting rod are slidably connected. Both the first adjusting rod and the second adjusting rod have rack structures on their sides. The first adjusting rod and the second adjusting rod are respectively located on opposite sides of the gear, and the first adjusting rod and the second adjusting rod are meshed with the gear through the rack structures. One end of the first adjusting rod extends to the outside of the housing and is fixedly connected to the first permanent magnet disk, and one end of the second adjusting rod extends to the outside of the housing and is fixedly connected to the second permanent magnet disk.

7. The magnetic levitation wind turbine generator set as claimed in claim 6, characterized in that: The other end of the first adjusting rod and the other end of the second adjusting rod are each provided with a second limiting member, which abuts against the gear component.

8. The magnetic levitation wind turbine generator set as described in claim 5, characterized in that: The eddy current coupling device includes at least four of the synchronous adjustment components, which are equidistantly arranged along the circumference of the first permanent disk or the second permanent disk. And / or, the eddy current coupling device includes at least four of the connecting rods, which are equidistantly arranged along the circumference of the first permanent disk or the second permanent disk.

9. The magnetic levitation wind turbine generator set as claimed in claim 2, wherein: The first permanent magnet disk has a first bushing fixedly connected to its shaft end, which is used to fix the end of the transmission shaft; and / or, the conductor disk has a second bushing fixedly connected to its shaft end, which is used to fix the end of the motor shaft.

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