Magnetic suspension bearing system and control method thereof
By independently adjusting the direction of the electromagnetic force and adopting a protective structure, the stability and safety issues of the magnetic levitation bearing system have been solved, achieving precise positioning and rapid response of the shaft, and reducing system complexity and maintenance difficulty.
Patent Information
- Application Number
- CN202511531619.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-24
- Publication Date
- 2026-03-13
AI Technical Summary
Magnetic levitation bearing systems are prone to instability without external control intervention, and the rotor may collide with the stator or other components in the event of a sudden power outage or system failure, resulting in bearing damage. Existing control solutions are costly and complex.
Different coils and electromagnets are used to control the movement of the shaft in various directions. Combined with a protective structure, including the magnetic attraction between the electromagnet and the push plate and the moving ring, the shaft can be flexibly limited and precisely positioned, reducing system complexity and preventing the shaft from colliding when power is off.
It reduces system complexity, improves response speed, facilitates fault location and maintenance, ensures stable positioning of the shaft during power failure, prevents collisions, and improves system safety and reliability.
Smart Images
Figure CN121654675A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of magnetic levitation bearings, specifically to a magnetic levitation bearing system and its control method. Background Technology
[0002] Magnetic levitation bearings use electromagnetic force to levitate the rotor in the air, eliminating mechanical contact between the rotor and stator. Compared to traditional ball bearings, sliding bearings, and oil film bearings, the rotor can operate at very high speeds and has advantages such as low mechanical wear, low energy consumption, low noise, long life, no need for lubrication, and no oil contamination. It is particularly suitable for special environments such as high speed, vacuum, ultra-clean, and low-interference environments.
[0003] However, the stable operation of magnetic levitation bearings faces unique technical challenges: they are essentially open-loop unstable mechanical systems. When the rotor deviates from its equilibrium position, without external control intervention, the system will continue to become unstable due to the nonlinear coupling relationship between electromagnetic force and displacement. Therefore, achieving stable rotor levitation requires high-precision real-time control technology. Currently, sensors are typically used to detect minute axial and radial displacements of the rotor. The controller calculates the required electromagnetic force compensation based on the displacement signals and adjusts the current in the electromagnet coil through a power amplifier to dynamically adjust the electromagnetic force to counteract external interference, ultimately maintaining the rotor's precise levitation at the target position. However, this approach relies on high-performance sensors, complex control algorithms, and high-power amplifiers, resulting in high costs and system complexity. Furthermore, in the event of a sudden power outage or system failure, the high-speed rotating rotor may deviate due to inertia and potentially collide with the stator or other components at high speed, leading to bearing damage.
[0004] Based on this, this application proposes a magnetic levitation bearing system and its control method. Summary of the Invention
[0005] This application proposes a magnetic levitation bearing system and its control method, which has the following advantages: It uses different coils and electromagnets to control the movement of the shaft body in various directions, allowing independent adjustment of the magnitude and direction of the electromagnetic force for each direction, reducing system complexity, improving response speed, and facilitating the determination of the direction and specific location of the fault, thus improving maintenance and replacement convenience; it also features a protective structure that allows for flexible limiting of the shaft body when the magnetic levitation bearing is de-energized, preventing direct collision between the shaft body and the fixed part, while ensuring that the shaft body is accurately positioned at the center of the fixed part, providing a stable initial state for the restart of the magnetic levitation bearing, and solving the technical problems mentioned in the background art.
[0006] To achieve the above objectives, this application adopts the following technical solution: a magnetic levitation bearing system, comprising a fixed part, a rotating shaft part, and a controller. The fixed part includes a first suspension structure. On one side of the first suspension structure, a position detection structure, a second suspension structure, and a protective structure are sequentially arranged. The position detection structure is located on the side of the second suspension structure closer to the first suspension structure. On the other side of the first suspension structure, a third suspension structure and another protective structure are sequentially arranged. The third suspension structure is located on the side of the other protective structure closer to the first suspension structure. The rotating shaft part is located within the cavity of the fixed part. The rotating shaft part includes a rotating shaft body. Push plates are connected to the outer rings at both ends of the rotating shaft body. One push plate is located within the cavity of the second suspension structure, and the other push plate is located within the cavity of the third suspension structure. Both the second and third suspension structures include a first housing. A fixed ring adapted to the rotating shaft portion is connected to the end of the first housing cavity away from the pushing plate. An electromagnet and a first displacement sensor are mounted on the fixed ring. The protection structure includes a second housing connected to the first housing, a movable ring sleeved on the outer ring of the rotating shaft portion, and a protective airbag connected to the inner wall of the second housing. The movable ring is connected to the second housing via a guide rod, a spring, and a temporary airbag. The inner cavity of the temporary airbag is connected to the inner cavity of the protective airbag via a mesh ring. When the electromagnet is energized, the electromagnet, the pushing plate, and the movable ring are all magnetically attracted to each other.
[0007] Preferably, the first suspension structure includes a third shell, and a first coil is provided at the top and bottom of the inner wall of the third shell. When the first coil is energized, it generates a magnetic field to control the up and down movement of the rotating shaft body. A second coil is provided on the left and right sides of the inner wall of the third shell. When the second coil is energized, it generates a magnetic field to control the left and right movement of the rotating shaft body.
[0008] Preferably, the position detection structure includes a fourth housing connected to the third housing, a second displacement sensor for detecting the vertical movement of the rotating shaft body, and a third displacement sensor for detecting the horizontal movement of the rotating shaft body. The second displacement sensor and the third displacement sensor are detachably connected to the fourth housing via mounting bases, and the second displacement sensor and the third displacement sensor are evenly distributed along the outer circumference of the rotating shaft body. The controller is connected to the first displacement sensor, the second displacement sensor, and the third displacement sensor. The controller is also connected to the electromagnet, the first coil, and the second coil via a power amplifier.
[0009] Preferably, the outer ring of the rotating shaft body is coaxially provided with a positioning belt, the positioning belt is located in the inner cavity of the position detection structure, and both the third displacement sensor and the second displacement sensor monitor the position change of the positioning belt.
[0010] Preferably, one end of the electromagnet and the first displacement sensor are both located in the inner cavity of the first housing, and the other end of the electromagnet is located in the inner cavity of the second housing.
[0011] Preferably, in the first suspension structure, the position detection structure, the second suspension structure, and the protection structure, an electromagnetic shielding plate is provided between adjacent pairs; in the first suspension structure, the third suspension structure, and the other protection structure, an electromagnetic shielding plate is provided between adjacent pairs.
[0012] Preferably, the second housing is L-shaped, and a protective airbag is provided on the inner wall of the vertical end of the second housing. The temporary storage airbag is located in the inner cavity of the horizontal end of the second housing. One end of the guide rod is connected to the vertical end of the second housing, and the other end of the guide rod is connected to the fixed ring. The movable ring is movably sleeved on the guide rod and is connected to the vertical end of the second housing by a spring. One end of the temporary storage airbag is connected to the vertical end of the second housing, and the other end of the temporary storage airbag is connected to the movable ring.
[0013] Preferably, the tension exerted by the spring on the moving ring is less than the electromagnetic attraction force generated by the electromagnet on the moving ring when energized.
[0014] Preferably, the system achieves control through the following steps: Detection steps: Use the third and second displacement sensors to obtain the position of the rotating shaft body; use the first displacement sensor to obtain the position of the push plate; Judgment steps: Based on the data collected by the third displacement sensor, the controller obtains the left and right offset of the central axis of the rotating shaft body relative to the reference position; based on the data collected by the second displacement sensor, the controller obtains the up and down offset of the central axis of the rotating shaft body relative to the reference position; based on the data collected by the first displacement sensor, the controller obtains the offset of the push plate relative to the reference position. Control steps: Based on the vertical displacement of the central axis of the rotating shaft body, the controller adjusts the current of the first coil, changes the magnetic force generated by the first coil, and pushes the rotating shaft body back to the preset ideal center position; based on the horizontal displacement of the central axis of the rotating shaft body, the controller adjusts the current of the second coil, changes the magnetic force generated by the second coil, and pushes the rotating shaft body back to the preset ideal center position. Based on the offset of the push plate, the controller adjusts the current of the electromagnets in the second and third suspension structures, and adjusts the magnetic attraction between the electromagnets and the adjacent push plates, so that the push plates return to the reference position.
[0015] Preferably, in the detection step, both the second displacement sensor and the third displacement sensor detect the distance between themselves and the positioning strip.
[0016] The present invention has the following beneficial effects: 1. By using different coils and electromagnets to control the movement of the shaft body in various directions, the magnitude and direction of the electromagnetic force can be adjusted independently for each direction, reducing system complexity, improving response speed, and facilitating the determination of the direction and specific location of the fault, thereby improving the convenience of maintenance and replacement.
[0017] 2. It has a protective structure. When the electromagnet is energized, the gas in the protective airbag enters the temporary airbag, keeping the protective structure in a non-contact state with the rotating shaft body. This ensures that the rotating shaft body rotates without obstruction. When the power is off, the gas in the temporary airbag is squeezed into the protective airbag by the spring's rebound force. This causes the protective airbag to expand and come into contact with the rotating shaft body, achieving flexible limiting of the rotating shaft body. This prevents the rotating shaft body from directly colliding with the fixed part and ensures that the rotating shaft body is accurately positioned at the center of the fixed part, providing a stable initial state for the reuse of the magnetic levitation bearing. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of a magnetic levitation bearing system proposed in this invention; Figure 2 Schematic diagram showing the limiting effect of the airbag on the rotating shaft body; Figure 3 for Figure 1 Cross-sectional view; Figure 4 Schematic diagram of the cross-section of the protective structure and the second suspension structure; Figure 5 This is a schematic diagram of the cross-section of the position detection structure; Figure 6 This is a schematic cross-sectional view of the first suspension structure; Figure 7 This is a flowchart of a control method for a magnetic levitation bearing system.
[0019] In the diagram: 1. Third housing; 2. Fourth housing; 3. Mounting base; 4. First housing; 5. Second housing; 6. Second coil; 7. Rotating shaft body; 8. Controller; 9. First coil; 10. Electromagnetic shielding plate; 11. Push plate; 12. Spring; 13. Guide rod; 14. Temporary storage airbag; 15. Third displacement sensor; 16. Moving ring; 17. Protective airbag; 18. Electromagnet; 19. Fixed ring; 20. Positioning belt; 21. First displacement sensor; 22. Mesh ring; 23. Second displacement sensor. Detailed Implementation
[0020] The technical solution of the present invention will be clearly and completely described below with reference to preferred embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0021] like Figures 1 to 7 A magnetic levitation bearing system includes a fixed part, a rotating shaft part located inside the cavity of the fixed part, and a controller 8. The fixed part includes a first levitation structure, which includes a third housing 1. A first coil 9 is provided at the top and bottom of the inner wall of the third housing 1. When the first coil 9 is energized, it generates a magnetic field that interacts with the rotating shaft part to form a pulling force on the rotating shaft. The cooperation of the two first coils 9 can control the up and down movement of the rotating shaft part. A second coil 6 is provided on the left and right sides of the inner wall of the third housing 1. When the second coil 6 is energized, it generates a magnetic field that interacts with the rotating shaft part to form a pulling force on the rotating shaft. The cooperation of the two second coils 6 can control the left and right movement of the rotating shaft part.
[0022] A position detection structure, a second suspension structure, and a protective structure are sequentially arranged on one side of the first suspension structure. The position detection structure is located on the side of the second suspension structure closer to the first suspension structure. The position detection structure includes a fourth housing 2 connected to the third housing 1, a second displacement sensor 23 for detecting the vertical movement of the rotating shaft body 7, and a third displacement sensor 15 for detecting the horizontal movement of the rotating shaft body 7. The second displacement sensor 23 and the third displacement sensor 15 are detachably connected to the fourth housing 2 via mounting bases 3, which facilitates the removal of the mounting bases 3 and the replacement of the second displacement sensor 23 and the third displacement sensor 15. The second displacement sensor 23 and the third displacement sensor 15 are evenly distributed along the outer circumference of the rotating shaft body 7.
[0023] By setting the second displacement sensor 23 and the third displacement sensor 15, when this application is in use, the controller can determine the offset of the rotating shaft in the vertical and horizontal directions based on the data collected by the second displacement sensor 23, the data collected by the third displacement sensor 15, and the data collected by the second displacement sensor 23 and the third displacement sensor 15 when the rotating shaft is in the reference position. Based on the offset, the controller of this application can adjust the coil current in the corresponding offset direction, change the force between the coil and the rotating shaft, and push the rotating shaft back to the preset ideal center position, thereby realizing the adjustment of the position of the rotating shaft.
[0024] The rotating shaft portion includes a rotating shaft body 7, which is located in the center of the inner cavity of the fixed portion. A positioning band 20 is coaxially arranged on the outer ring of the rotating shaft body 7. The positioning band 20 is located within the inner cavity of the position detection structure, and both the second displacement sensor 23 and the third displacement sensor 15 monitor the position change of the positioning band 20. A pushing piece 11 is provided at one end of the rotating shaft body 7, located within the inner cavity of the second suspension structure. A third suspension structure and another protective structure are sequentially arranged on the other side of the first suspension structure. The third suspension structure is located on the side of the other protective structure closer to the first suspension structure. Another pushing piece 11 is provided at the other end of the rotating shaft body 7, located within the inner cavity of the third suspension structure. Figure 3 As shown.
[0025] Both the second and third suspension structures include a first housing 4. The end of the inner cavity of the first housing 4 away from the push plate 11 is connected to a fixing ring 19 adapted to the rotating shaft. An electromagnet 18 and a first displacement sensor 21 are mounted on the fixing ring 19. The first displacement sensor 21 is located in the inner cavity of the first housing 4. The controller 8 is connected to the first displacement sensor 21, the second displacement sensor 23, and the third displacement sensor 15. The controller 8 is connected to the electromagnet 18, the first coil 9, and the second coil 6 through a power amplifier.
[0026] The protective structure includes a second housing 5 connected to the first housing 4, a movable ring 16 sleeved on the outer ring of the rotating shaft portion, and a protective airbag 17 connected to the inner wall of the second housing 5. One end of the electromagnet 18 and the first displacement sensor 21 are both located in the inner cavity of the first housing 4, and the other end of the electromagnet 18 is located in the inner cavity of the second housing 5. The second housing 5 is L-shaped, and the protective airbag 17 is provided on the inner wall of the vertical end of the second housing 5. The movable ring 16 is connected to the second housing 5 through a guide rod 13, a spring 12, and a temporary storage airbag 14. The temporary storage airbag 14 is located in the inner cavity of the horizontal end of the second housing 5. One end of the guide rod 13 is connected to the vertical end of the second housing 5, and the other end of the guide rod 13 is connected to the fixed ring 19. The movable ring 16 is movably sleeved on the guide rod 13. The movable ring 16 is connected to the vertical end of the second housing 5 through the spring 12. One end of the temporary storage airbag 14 is connected to the vertical end of the second housing 5, and the other end of the temporary storage airbag 14 is connected to the movable ring 16. The inner cavity of the temporary storage airbag 14 is connected to the inner cavity of the protective airbag 17 through the mesh ring 22.
[0027] In addition, when the electromagnet 18 is energized, the electromagnet 18, the push plate 11, and the moving ring 16 are all magnetically attracted to each other. The tension applied by the spring 12 to the moving ring 16 is less than the electromagnetic attraction force generated by the electromagnet 18 on the moving ring 16 when energized. The tension applied by the spring 12 to the moving ring 16 can be set as needed and is not limited here.
[0028] As described above, when the electromagnet 18 is energized, the magnetic attraction between the electromagnet 18 and the moving ring 16 causes the volume of the temporary storage airbag 14 to increase. The gas inside the protective airbag 17 can then enter the temporary storage airbag 14 under the action of the protective airbag 17's rebound force, causing the protective airbag 17 to shrink in volume. This keeps the rotating shaft body 7 in a non-contact state, ensuring that the rotating shaft body 7 rotates without obstruction. When the electromagnet 18 is de-energized, the gas inside the temporary storage airbag 14 is squeezed into the protective airbag 17 under the action of the spring 12's rebound force. This causes the protective airbag 17 to expand in volume and contact the rotating shaft body 7, achieving flexible limiting of the rotating shaft body 7. This prevents the rotating shaft body 7 from directly colliding with the fixed part and ensures that the rotating shaft body 7 is accurately positioned at the center of the fixed part, providing a stable initial state for the reactivation of the magnetic levitation bearing.
[0029] In the first suspension structure, the position detection structure, the second suspension structure, and the protection structure, an electromagnetic shielding plate 10 is provided between adjacent pairs. Similarly, in the first suspension structure, the third suspension structure, and the other protection structure, an electromagnetic shielding plate 10 is provided between adjacent pairs. The electromagnetic shielding plate 10 reduces the influence of the first coil 9 and the second coil 6 on the electromagnet 18, allowing the controller 8 to precisely adjust the position of the rotating shaft by regulating the currents of the first coil 9, the second coil 6, and the electromagnet 18. The housing of the fixed part has a heat dissipation function to facilitate heat dissipation during the operation of the magnetic levitation bearing.
[0030] As described above, the magnetic levitation bearing system uses different coils and electromagnets to control the movement of the shaft body in various directions during use. It can independently adjust the magnitude and direction of the electromagnetic force in each direction, reducing system complexity, improving response speed, and facilitating the determination of the direction and specific location of the fault, thereby improving the convenience of maintenance and replacement.
[0031] This invention proposes a control method for a magnetic levitation bearing system, comprising the following steps: Detection steps: The distance between the shaft body 7 and the positioning belt 20 is detected by the third displacement sensor 15 and the second displacement sensor 23, thereby obtaining the position of the shaft body 7; the position of the push plate 11 is obtained by the first displacement sensor 21. Judgment steps: Based on the data collected by the third displacement sensor 15, the controller 8 obtains the left and right offset of the central axis of the rotating shaft body 7 relative to the reference position; based on the data collected by the second displacement sensor 23, the controller 8 obtains the up and down offset of the central axis of the rotating shaft body 7 relative to the reference position; based on the data collected by the first displacement sensor 21, the controller 8 obtains the offset of the push plate 11 relative to the reference position. Control steps: Based on the vertical displacement of the central axis of the rotating shaft body 7, the controller 8 adjusts the current of the first coil 9, changes the magnetic force generated by the first coil 9, and pushes the rotating shaft body 7 back to the preset ideal center position; based on the horizontal displacement of the central axis of the rotating shaft body 7, the controller 8 adjusts the current of the second coil 6, changes the magnetic force generated by the second coil 6, and pushes the rotating shaft body 7 back to the preset ideal center position. Based on the offset of the push plate 11, the controller 8 adjusts the current of the electromagnet 18 in the second and third suspension structures, and adjusts the magnetic attraction between the electromagnet 18 and the adjacent push plate 11, so that the push plate 11 returns to the reference position.
[0032] For example, when the shaft body 7 is in a downward state, the controller 8 increases the current of the first coil 9 located above the shaft body 7 and decreases the current of the other first coil 9 located below the shaft body 7. By adjusting the distribution of electromagnetic force in the up and down directions, an upward net force is generated to push the shaft body 7 upward until the shaft body 7 is reset. The controller adjusts the current of the two first coils 9 so that the current of the two first coils 9 is the same and the pulling force of the two first coils 9 on the shaft body 7 is the same, so the position of the shaft body 7 can remain unchanged.
[0033] When the rotating shaft body 7 moves backward, that is, when the rotating shaft body 7 moves in the direction of the other protective structure, the controller 8 increases the current of the electromagnet 18 away from the other protective structure and decreases the current of the electromagnet 18 close to the other protective structure. By adjusting the attraction force of the two electromagnets 18 on the push plate 11, the push plate 11 will be subjected to a resultant force away from the other protective structure under the effect of the change in the magnitude of the attraction force, thereby driving the rotating shaft body 7 to move in the direction away from the other protective structure. By precisely adjusting the attraction force of the two electromagnets 18 on the push plate 11, the position of the rotating shaft body 7 in the front-back direction can be effectively adjusted, ensuring that the rotating shaft body 7 is always in the ideal operating position, maintaining the stability and safety of the system, and realizing the adjustment of the position of the rotating shaft body 7 in the front-back direction.
[0034] All standard parts used in this invention can be purchased from the market, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods of each structure adopt conventional techniques such as bolt connections that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The materials and specifications of each component can be selected according to requirements and are not limited here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A magnetic levitation bearing system, comprising a fixed part, a rotating shaft part, and a controller (8), characterized in that: The fixed part includes a first suspension structure. A position detection structure, a second suspension structure, and a protective structure are sequentially arranged on one side of the first suspension structure. The position detection structure is located on the side of the second suspension structure close to the first suspension structure. A third suspension structure and another protective structure are sequentially arranged on the other side of the first suspension structure. The third suspension structure is located on the side of the other protective structure close to the first suspension structure. The rotating shaft part is located in the inner cavity of the fixed part. The rotating shaft part includes a rotating shaft body (7). Pushing pieces (11) are connected to the outer rings at both ends of the rotating shaft body (7). One pushing piece (11) is located in the inner cavity of the second suspension structure, and the other pushing piece (11) is located in the inner cavity of the third suspension structure. Both the second and third suspension structures include a first housing (4). The end of the inner cavity of the first housing (4) away from the push plate (11) is connected to a fixed ring (19) adapted to the rotating shaft. An electromagnet (18) and a first displacement sensor (21) are installed on the fixed ring (19). The protective structure includes a second housing (5) connected to the first housing (4), a moving ring (16) sleeved on the outer ring of the rotating shaft, and a protective airbag (17) connected to the inner wall of the second housing (5). The moving ring (16) is connected to the second housing (5) through a guide rod (13), a spring (12), and a temporary airbag (14). The inner cavity of the temporary airbag (14) is connected to the inner cavity of the protective airbag (17) through a mesh ring (22). When the electromagnet (18) is energized, the electromagnet (18), the push plate (11), and the moving ring (16) are all in a state of magnetic attraction.
2. The magnetic levitation bearing system according to claim 1, characterized in that: The first suspension structure includes a third shell (1). A first coil (9) is provided at the top and bottom of the inner wall of the third shell (1). When the first coil (9) is energized, it generates a magnetic field to control the up and down movement of the rotating shaft body. A second coil (6) is provided on the left and right sides of the inner wall of the third shell (1). When the second coil (6) is energized, it generates a magnetic field to control the left and right movement of the rotating shaft body.
3. A magnetic levitation bearing system according to claim 2, characterized in that: The position detection structure includes a fourth housing (2) connected to the third housing (1), a second displacement sensor (23) for detecting the up-down movement of the rotating shaft body (7), and a third displacement sensor (15) for detecting the left-right movement of the rotating shaft body (7). The second displacement sensor (23) and the third displacement sensor (15) are detachably connected to the fourth housing (2) through the mounting base (3). The second displacement sensor (23) and the third displacement sensor (15) are evenly distributed along the outer circumference of the rotating shaft body (7). The controller (8) is connected to the first displacement sensor (21), the second displacement sensor (23) and the third displacement sensor (15). The controller (8) is connected to the electromagnet (18), the first coil (9) and the second coil (6) through a power amplifier.
4. A magnetic levitation bearing system according to claim 3, characterized in that: The outer ring of the rotating shaft body (7) is coaxially provided with a positioning belt (20). The positioning belt (20) is located in the inner cavity of the position detection structure, and the third displacement sensor (15) and the second displacement sensor (23) both monitor the position change of the positioning belt (20).
5. A magnetic levitation bearing system according to claim 1, characterized in that: One end of the electromagnet (18) and the first displacement sensor (21) are both located in the inner cavity of the first housing (4), and the other end of the electromagnet (18) is located in the inner cavity of the second housing (5).
6. A magnetic levitation bearing system according to claim 1, characterized in that: In the first suspension structure, the position detection structure, the second suspension structure and the protection structure, an electromagnetic shielding plate (10) is provided between adjacent pairs. In the first suspension structure, the third suspension structure and the other protection structure, an electromagnetic shielding plate (10) is provided between adjacent pairs.
7. A magnetic levitation bearing system according to claim 1, characterized in that: The second housing (5) is L-shaped. A protective airbag (17) is provided on the inner wall of the vertical end of the second housing (5). The temporary storage airbag (14) is located in the inner cavity of the horizontal end of the second housing (5). One end of the guide rod (13) is connected to the vertical end of the second housing (5). The other end of the guide rod (13) is connected to the fixed ring (19). The moving ring (16) is movably sleeved on the guide rod (13). The moving ring (16) is connected to the vertical end of the second housing (5) through the spring (12). One end of the temporary storage airbag (14) is connected to the vertical end of the second housing (5). The other end of the temporary storage airbag (14) is connected to the moving ring (16).
8. A magnetic levitation bearing system according to claim 1, characterized in that: The tension exerted by the spring (12) on the moving ring (16) is less than the electromagnetic attraction force generated by the electromagnet (18) on the moving ring (16) when it is energized.
9. A magnetic levitation bearing system according to claim 1, characterized in that, The system achieves control through the following steps: Detection steps: Use the third displacement sensor (15) and the second displacement sensor (23) to obtain the position of the rotating shaft body (7); use the first displacement sensor (21) to obtain the position of the push plate (11); Judgment steps: Based on the data collected by the third displacement sensor (15), the controller (8) obtains the left and right offset of the central axis of the rotating shaft body (7) relative to the reference position; based on the data collected by the second displacement sensor (23), the controller (8) obtains the up and down offset of the central axis of the rotating shaft body (7) relative to the reference position; based on the data collected by the first displacement sensor (21), the controller (8) obtains the offset of the push plate (11) relative to the reference position. Control steps: Based on the vertical displacement of the central axis of the rotating shaft body (7), the controller (8) adjusts the current of the first coil (9), changes the magnetic force generated by the first coil (9), and pushes the rotating shaft body (7) back to the preset ideal center position; Based on the horizontal displacement of the central axis of the rotating shaft body (7), the controller (8) adjusts the current of the second coil (6), changes the magnetic force generated by the second coil (6), and pushes the rotating shaft body (7) back to the preset ideal center position; According to the offset of the push plate (11), the controller (8) adjusts the current of the electromagnet (18) in the second and third suspension structures, adjusts the magnetic attraction between the electromagnet (18) and the adjacent push plate (11), so that the push plate (11) returns to the reference position.
10. A magnetic levitation bearing system according to claim 9, characterized in that: In the detection step, both the second displacement sensor (23) and the third displacement sensor (15) detect the distance between themselves and the positioning belt (20).