Self-synchronous device of magnetic suspension system protection bearing and magnetic suspension system

Abstract

This invention provides a self-synchronizing device for a protective bearing in a magnetic levitation system and a magnetic levitation system. The device includes a boss and two magnetic ring assemblies. The boss protrudes from the inner ring of the protective bearing on the side opposite to the magnetic levitation bearing. The two magnetic ring assemblies are respectively fitted onto the outside of the boss and the outside of the rotor's bushing. The two magnetic ring assemblies are arranged opposite each other and spaced a predetermined distance apart to form an axial air gap. When the rotor rotates, the two magnetic ring assemblies generate a tangential torque to drive the inner ring of the protective bearing to rotate synchronously with the rotor. This invention achieves zero-slip synchronous rotation between the inner ring of the protective bearing and the rotor. When the rotor falls, there is zero-slip contact between the inner ring of the protective bearing and the rotor, effectively reducing high-temperature wear caused by the rotor fall. Furthermore, there is no electromagnetic loss, extending the service life of the protective bearing. There is no need to magnetize the entire inner ring of the protective bearing, preventing stray magnetic fields from interfering with other equipment. The two magnetic ring assemblies are modularly designed, requiring minimal modification to the manufacturing process of the protective bearing.

Description

Technical Field

[0001] This invention relates to the field of magnetic levitation system technology, and more specifically, to a self-synchronization device for protecting bearings in a magnetic levitation system and a magnetic levitation system. Background Technology

[0002] In magnetic levitation systems, the protective bearing, as a core component for safety redundancy, typically has its inner ring loosely fitted onto the rotor with a tiny gap of 0.1~0.5mm. During normal levitation operation, there is no mechanical contact between the rotor and the inner ring of the protective bearing, and the inner ring remains stationary or at low speed. When the active magnetic bearing fails and the rotor momentarily falls onto the protective bearing, a significant speed difference exists between the rotor and the inner ring of the protective bearing, easily leading to severe sliding friction, resulting in high temperatures, wear, and even jamming, seriously threatening the safe and stable operation of the magnetic levitation equipment and its supporting power grid systems. Therefore, rotating the inner ring of the protective bearing synchronously with the rotor can effectively mitigate problems such as high-temperature wear during protective operation.

[0003] The method for synchronizing the inner ring of a protective bearing with the rotor typically employs a hysteresis coupling synchronization scheme. This scheme involves setting a magnetization structure locally on the rotor and fitting a hysteresis alloy sleeve onto the inner ring of the protective bearing. The alternating magnetic field generated by the rotor's rotation induces hysteresis torque in the hysteresis alloy sleeve, causing the inner ring of the protective bearing to rotate with the rotor. However, hysteresis coupling suffers from inherent electromagnetic losses, generating significant heat during high-speed operation, leading to increased protective bearing temperature, accelerated grease aging, and a shortened protective bearing lifespan. Furthermore, hysteresis coupling exhibits a 1%–3% slip, making complete synchronization between the rotor and the inner ring of the protective bearing impossible, and the risk of slippage and friction remains during drops. In addition, magnetizing the entire inner ring of the protective bearing can cause it to attract iron filings and abrasive particles, exacerbating wear. Moreover, stray magnetic fields may interfere with the displacement sensor of the active magnetic bearing, affecting the system's control accuracy. Summary of the Invention

[0004] In view of this, the present invention proposes a self-synchronizing device for protecting the bearings of a magnetic levitation system, aiming to solve the problems of high electromagnetic loss, low synchronization accuracy, and interference with the main system in existing hysteresis coupling synchronization schemes. The present invention also proposes a magnetic levitation system with this self-synchronizing device for protecting the bearings of the magnetic levitation system.

[0005] In one aspect, the present invention proposes a self-synchronizing device for a protective bearing in a magnetic levitation system. The device includes: an annular boss and two magnetic ring assemblies; wherein the boss protrudes from the side of the inner ring of the protective bearing in the magnetic levitation system away from the magnetic levitation bearing; one magnetic ring assembly is sleeved on the outside of the boss, and the other magnetic ring assembly is sleeved on the outside of the bushing of the rotor in the magnetic levitation system. The two magnetic ring assemblies are arranged opposite each other and spaced apart by a preset distance to form an axial air gap. The two magnetic ring assemblies are used to generate a tangential torque when the rotor rotates to drive the inner ring of the protective bearing to rotate synchronously with the rotor.

[0006] Furthermore, in the self-synchronization device for protecting the bearings of the aforementioned magnetic levitation system, the positions of the two magnetic ring assemblies correspond and their structural parameters are matched.

[0007] Furthermore, in the self-synchronization device for protecting the bearing of the aforementioned magnetic levitation system, each magnetic ring assembly includes: multiple magnets and non-magnetic sleeves and rings; wherein, the sleeve is fitted outside the boss or bushing; each magnet is spaced apart on the outer wall of the sleeve along the circumferential direction, and non-magnetic filler is filled between two adjacent magnets; the magnetic poles of each magnet are alternately distributed along the circumferential direction at any end face of the sleeve; the ring is fitted outside each magnet; the positions of each magnet in the two magnetic ring assemblies correspond one-to-one, and the magnetic poles of the two magnets at corresponding positions are opposite on opposite end faces.

[0008] Furthermore, in the self-synchronization device for protecting the bearing of the aforementioned magnetic levitation system, each magnet is axially multi-pole magnetized, and the magnetization direction is the axial direction of the rotor; and / or, each magnet is made of ferrite material or high-performance rare earth permanent magnet material.

[0009] Furthermore, in the self-synchronization device for protecting the bearings of the aforementioned magnetic levitation system, the sleeve and the boss or bushing are connected by an interference fit and are pressed together by a heat fitting process; the ring and each magnet are connected by an interference fit.

[0010] Furthermore, in the self-synchronization device for protecting the bearing of the aforementioned magnetic levitation system, the axial air gap between the two magnetic ring assemblies is 1.0mm~2.5mm.

[0011] Furthermore, in the self-synchronization device for the protective bearing of the aforementioned magnetic levitation system, the magnetic ring assembly located at the boss has an axial clearance of greater than or equal to 1.5 mm between it and the protective bearing.

[0012] Furthermore, in the self-synchronization device for protecting the bearing of the aforementioned magnetic levitation system, the outer wall surface of the boss has a preset roughness.

[0013] Furthermore, in the self-synchronization device for the protective bearing of the aforementioned magnetic levitation system, the outer diameter of the boss is smaller than the outer diameter of the inner ring of the protective bearing; the connection between the boss and the inner ring of the protective bearing is a rounded transition.

[0014] In this invention, a boss is provided on the side of the inner ring of the protective bearing facing away from the rotor. One magnetic ring assembly is sleeved on the outside of the boss, and the other magnetic ring assembly is sleeved on the outside of the rotor's bushing. The two magnetic ring assemblies are arranged opposite each other and spaced apart by a preset distance to form an axial air gap. When the rotor rotates, the end faces of the two magnetic ring assemblies couple magnetic fields to generate a tangential torque, thereby driving the inner ring of the protective bearing to rotate synchronously with the rotor. This achieves zero-slip synchronous rotation between the inner ring of the protective bearing and the rotor. Thus, when the active magnetic bearing in the magnetic levitation system fails and the rotor falls, there is zero-slip contact between the inner ring of the protective bearing and the rotor, effectively reducing high-temperature wear caused by the rotor falling onto the protective bearing and reducing slippage friction. This eliminates the risk of electromagnetic loss, and the synchronous rotation of the two magnetic ring assemblies prevents the protective bearing from overheating, extending its service life. It also eliminates the need for overall magnetization of the inner ring of the protective bearing, preventing the adsorption of iron filings and abrasive particles, reducing wear, and preventing stray magnetic fields from interfering with other equipment, thus avoiding impacting the control accuracy of the magnetic levitation system. It is suitable for the long-term stable operation requirements of the magnetic levitation system and solves the problems of high electromagnetic loss, low synchronization accuracy, and interference with the main system in existing hysteresis coupling synchronization schemes. Furthermore, the two magnetic ring assemblies in this device are modularly designed, requiring minimal modification to the manufacturing process of the protective bearing, resulting in a simple structure and easy implementation.

[0015] On the other hand, the present invention also proposes a magnetic levitation system, which includes: a rotor, two protective bearings and two self-synchronizing devices for the protective bearings of any of the above-mentioned magnetic levitation systems; wherein, the two protective bearings are respectively disposed at two ends of the rotor; and the two self-synchronizing devices for the protective bearings of the magnetic levitation system are disposed at the two protective bearings in a one-to-one correspondence.

[0016] Since the self-synchronization device for protecting the bearings of a magnetic levitation system has the aforementioned effects, a magnetic levitation system with the self-synchronization device for protecting the bearings of such a magnetic levitation system also has the corresponding technical effects. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of the structure of the self-synchronization device for protecting the bearings of a magnetic levitation system provided in an embodiment of the present invention; Figure 2 A schematic diagram of the structure of the magnetic ring assembly disposed at the boss in the self-synchronization device for protecting the bearing of the magnetic levitation system provided in the embodiment of the present invention. Figure 3A schematic diagram of the structure of the magnetic ring assembly disposed at the bushing in the self-synchronization device for protecting the bearing of the magnetic levitation system provided in the embodiment of the present invention; Figure 4 A schematic diagram of the axial magnetic field structure of two magnetic ring assemblies in the self-synchronization device for protecting the bearing of the magnetic levitation system provided in the embodiments of the present invention. Detailed Implementation

[0018] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] Device Example: See Figures 1 to 4 The figure shows a preferred structure of the self-synchronization device for the protective bearing of the magnetic levitation system in this embodiment. As shown, the self-synchronization device for the protective bearing of the magnetic levitation system is disposed at the protective bearing 8, which is sleeved on the outside of the rotor 5 and located on one side of the magnetic levitation bearing 4. The self-synchronization device for the protective bearing of the magnetic levitation system includes: a boss 1 and two magnetic ring assemblies 2. The boss 1 is annular and protrudes from the side of the inner ring 3 of the protective bearing in the magnetic levitation system away from the magnetic levitation bearing 4. Specifically, the boss 1 is disposed on the side of the inner ring 3 of the protective bearing away from the magnetic levitation bearing 4, and the boss 1 extends away from the protective bearing 8. The inner diameter of the boss 1 is equal to the inner diameter of the inner ring 3 of the protective bearing, and the outer diameter of the boss 1 is smaller than the outer diameter of the inner ring 3 of the protective bearing. Therefore, the outer wall of the boss 1 is lower than the outer wall of the inner ring 3 of the protective bearing, so that the outer wall of the boss 1 and the outer wall of the inner ring 3 of the protective bearing form a stepped structure.

[0020] In practice, the inner ring 3 of the protective bearing is axially extended on one side on the non-raceway side to form a boss 1. The boss 1 and the inner ring 3 of the protective bearing are integrally formed, and the boss 1 is the mounting base of the magnetic ring assembly 2.

[0021] Length of boss 1 ( Figure 1 The length of boss 1 (shown from left to right) is 16~20mm, preferably 18mm. The outer diameter of boss 1 is 0.8~1.2mm smaller than the outer diameter of the inner ring 3 of the protective bearing, preferably 1.0mm smaller than the outer diameter of the inner ring 3 of the protective bearing.

[0022] Preferably, the connection between the boss 1 and the inner ring 3 of the protective bearing is a rounded transition. Specifically, the connection between the outer wall of the boss 1 and the side wall at the end of the inner ring 3 of the protective bearing is a rounded transition. Preferably, the connection between the outer wall of the boss 1 and the side wall at the end of the inner ring 3 of the protective bearing is provided with a rounded transition of R≥1.5mm to avoid stress concentration.

[0023] Preferably, the outer wall surface of the boss 1 is precision ground to give it a preset roughness Ra. In practice, this preset roughness can be determined according to actual conditions, and this embodiment does not impose any restrictions on it. Specifically, the preset roughness Ra ≤ 1.6 μm serves as the axial positioning reference for the magnetic ring assembly 2.

[0024] One magnetic ring assembly 2 is fitted outside the boss 1, and the other magnetic ring assembly 2 is fitted outside the bushing 6 of the rotor 5 in the magnetic levitation system. Specifically, the bushing 6 is fitted at the end of the rotor 5. The bushing 6 is placed outside the protective bearing 8, that is, the bushing 6 is closer to the end of the rotor 5 than the protective bearing 8. Furthermore, there is a certain gap between the bushing 6 and the boss 1. The outer diameter of the bushing 6 is the same as the outer diameter of the boss 1, so the position of the outer wall of the bushing 6 corresponds to the position of the outer wall of the boss 1.

[0025] Two magnetic ring assemblies 2 are arranged opposite each other, specifically, the positions of the two magnetic ring assemblies 2 are corresponding, and the two magnetic ring assemblies 2 are arranged side by side, with a preset distance between them to form an axial air gap. When the rotor 5 rotates, the coupled magnetic field at the end faces of the two magnetic ring assemblies 2 generates a stable tangential torque to drive the inner ring 3 of the protective bearing to rotate synchronously with the rotor 5. Specifically, when the rotor 5 rotates, the magnetic levitation bearing 4 also rotates synchronously, and the rotor 5 drives the magnetic ring assembly 2 sleeved on the bushing 6 to rotate synchronously with the rotor 5 through the bushing 6. The coupled magnetic field at the end faces of the two magnetic ring assemblies 2 generates a stable tangential torque, which drives the magnetic ring assembly sleeved on the boss 1 to also rotate synchronously with the rotor 5. The magnetic ring assembly 1 drives the inner ring 3 of the protective bearing to rotate synchronously with the rotor 5 through the boss 1, thereby realizing the synchronous rotation of the inner ring 3 of the protective bearing with the rotor 5.

[0026] In practice, the preset distance between the two magnetic ring assemblies 2 can be determined according to actual conditions, and this embodiment does not impose any restrictions on it. Preferably, the axial air gap between the two magnetic ring assemblies 2 is 1.0mm to 2.5mm. More preferably, the axial air gap between the two magnetic ring assemblies 2 is 1.5mm. In practice, the size of the axial air gap is calibrated using a laser rangefinder.

[0027] In practice, the preset distance between the two magnetic ring assemblies 2 is equal to the distance between the bushing 6 and the boss 1.

[0028] The outer diameter of the boss 1 is smaller than the outer diameter of the inner ring 3 of the protective bearing, which can block the magnetic ring assembly 2 set on the boss 1 and prevent the magnetic ring assembly 2 from affecting the protective bearing 8.

[0029] As can be seen, in this embodiment, a boss 1 protrudes from the side of the inner ring 3 of the protective bearing away from the magnetic levitation bearing 4. One magnetic ring assembly 2 is sleeved on the outside of the boss 1, and the other magnetic ring assembly 2 is sleeved on the outside of the bushing 6 of the rotor 5. The two magnetic ring assemblies 2 are arranged opposite each other and spaced apart by a preset distance to form an axial air gap. When the rotor 5 rotates, the magnetic field coupled at the end faces of the two magnetic ring assemblies 2 generates a tangential torque to drive the inner ring 3 of the protective bearing to rotate synchronously with the rotor 5. This achieves zero-slip synchronous rotation between the inner ring 3 of the protective bearing and the rotor 5. In this way, when the active magnetic bearing in the magnetic levitation system fails and the rotor 5 falls, there is zero-slip contact between the inner ring 3 of the protective bearing and the rotor 5, which effectively reduces the high temperature caused when the rotor 5 falls onto the protective bearing 8. Wear is reduced, thus minimizing the risk of slippage and friction. Furthermore, the synchronous rotation of the two magnetic ring assemblies 2 results in no electromagnetic loss, preventing the protective bearing 8 from overheating and extending its service life. There is no need to magnetize the entire inner ring 3 of the protective bearing, preventing it from attracting iron filings and abrasive particles, reducing wear on the protective bearing 8. It also prevents stray magnetic fields from interfering with other equipment, avoiding impact on the control accuracy of the magnetic levitation system. This design is suitable for the long-term stable operation of the magnetic levitation system and solves the problems of high electromagnetic loss, low synchronization accuracy, and interference with the main system in existing hysteresis coupling synchronization schemes. In addition, the two magnetic ring assemblies 2 in this device are modularly designed, requiring minimal modification to the manufacturing process of the protective bearing, resulting in a simple structure and easy implementation.

[0030] See Figures 1 to 4 In the above embodiment, the positions of the two magnetic ring components 2 correspond to each other, and the structural parameters of the two magnetic ring components 2 are matched.

[0031] Each magnetic ring assembly 2 includes: multiple magnets 21, a sleeve 22, and a collar 23. Both the sleeve 22 and the collar 23 are annular. Both the sleeve 22 and the collar 23 are made of metal and are non-magnetic. In specific implementations, both the sleeve 22 and the collar 23 can be made of non-magnetic stainless steel.

[0032] In this embodiment, both the sleeve 22 and the collar 23 can be made of 304 / 316 austenitic stainless steel.

[0033] The sleeve 22 is fitted onto the outside of the boss 1 or the bushing 6, and is fixed to the boss 1 or the bushing 6. Preferably, the sleeve 22 and the boss 1 or the bushing 6 are connected by an interference fit and are pressed together by a heat-fitting process. Specifically, in one magnetic ring assembly 2, the sleeve 22 is fitted onto the outside of the boss 1, and is connected to the boss 1 by an interference fit and is pressed together by a heat-fitting process. More specifically, the sleeve 22 is heated to 100°~150° and pressed against the outer circle of the boss 1 to achieve 360° mechanical locking. In the other magnetic ring assembly 2, the sleeve 22 is fitted onto the outside of the bushing 6, and is connected to the bushing 6 by an interference fit and is pressed together by a heat-fitting process. This effectively improves the structural reliability of the two magnetic ring assemblies 2.

[0034] In practice, the sleeve 22 can also be rigidly fixed to the outside of the boss 2 or the outside of the bushing 6 by means of a shoulder or a locking nut, so as to ensure that it rotates synchronously with the rotor 5 without relative displacement.

[0035] Magnets 21 are spaced apart on the outer wall of sleeve 22 along its circumference. Preferably, magnets 21 are evenly distributed along the circumference of sleeve 22. A non-magnetic filler is used between adjacent magnets 21. Specifically, each magnet 21 is made of ferrite or high-performance rare-earth permanent magnet material. In specific implementations, each magnet 21 can be made of high-performance rare-earth permanent magnet material such as neodymium iron boron, and is used in conjunction with a surface anti-corrosion coating to obtain an equivalent coupling tangential torque with a smaller component size.

[0036] The axial length of each magnet 21 is 12-18 mm, preferably 15 mm. The radial thickness of each magnet 21 on one side is 6-10 mm, preferably 8 mm. The axial length of the magnet 21 is... Figure 1 The direction from left to right is radial. Figure 1 The direction from top to bottom.

[0037] The magnet 21 is arranged in 2 to 8 segments along the circumference of the sleeve 22, preferably in a 6-segment half-and ...

[0038] The magnetic poles of each magnet 21 are alternately distributed along the circumference of the sleeve 22 at any end face of the sleeve 22. Specifically, at any end face of the sleeve 22, the magnetic poles NS of each magnet 21 are alternately distributed, that is, the magnetic poles of any two adjacent magnets 21 are opposite. Each magnet 21 is axially multi-pole magnetized, and the magnetization direction is the axial direction of the rotor 5, that is, the magnetization direction is parallel to the rotor 5. More specifically, the end faces of each magnet 21 are alternately distributed along the circumference NS, and the number of poles of each magnet 21 is 4 to 8, preferably 6.

[0039] Preferably, each magnet 21 is axially multipole magnetized, and the magnetization direction is the axial direction of the rotor 5; and / or, each magnet 21 is made of ferrite material or high-performance rare earth permanent magnet material.

[0040] The collar 23 is sleeved on the outside of each magnet 21, and the collar 23 is fixed to each magnet 21. Specifically, the radial thickness of the collar 23 is 1.2~2.0mm, preferably 1.5mm.

[0041] The collar 23 is connected to each magnet 21 by an interference fit. More specifically, the inner diameter of the collar 23 is interference-fitted with the outer diameter of each magnet 21, and the interference amount is 0.03~0.08mm.

[0042] The sleeve 22 is connected to the boss 1 or the bushing 6 by an interference fit and is pressed by a heat fitting process. The ring 23 is also connected to each magnet 21 by an interference fit. This can provide a 360° uniform constraint force for the magnetic ring assembly 2, withstand a centrifugal load of 20 tons, and prevent each magnet 21 from shifting.

[0043] The structural parameters of the two magnetic ring assemblies 2 are matched, including axial length, radial thickness, number of poles, and magnetization direction. The two magnetic ring assemblies 2 contain the same number of magnets 21, and the positions of each magnet 21 correspond one-to-one. The magnetic poles of the two magnets 21 at corresponding positions are opposite on their opposite end faces, ensuring the tangential torque output of the magnetic field coupling. Thus, the two magnetic ring assemblies 2 form an axially coupled structure with opposite end faces, achieving contactless protection of the synchronous rotation of the bearing inner ring 3 and the rotor 5.

[0044] Preferably, the magnetic ring assembly 2 located at the boss 1 has an axial clearance of 1.5 mm or more between it and the end sidewall of the protective bearing 8, so as to avoid interference with the operation of the rolling element 7 located between the inner and outer rings in the protective bearing 8.

[0045] In this embodiment, the boss 1 is located in the non-working area of ​​the protective bearing 8. The core parameters of the protective bearing 8, such as raceway, clearance, and stiffness, remain unchanged, thus avoiding interference with the bearing raceway. When the rotor 5 falls, it can provide reliable mechanical support and fully retain the safety support redundancy function of the protective bearing 8.

[0046] In this embodiment, the multi-pole permanent magnet coupling of the opposite end faces of the two magnetic ring assemblies 2 provides a stable tangential torque, so that the angular velocity of the inner ring 3 of the protective bearing is consistent with that of the rotor 5. When the rotor 5 falls, pure rolling contact is achieved, avoiding wear, high temperature and jamming problems caused by sliding friction.

[0047] In this embodiment, the magnetic field coupling between the end faces of the two magnetic ring components 2 is a static magnetic field coupling, without an alternating magnetic field, and there is no hysteresis or eddy current loss. When running at high speed, the component temperature rise is ≤3℃, which avoids the thermal aging of the grease in the protective bearing 8 and ensures the long-term stable operation of the protective bearing 8.

[0048] In this embodiment, the end faces of the two magnetic ring assemblies 2 are coupled with magnetic fields, eliminating the need to increase the radial dimension of the protective bearing and avoiding interference with the bearing housing. Furthermore, the non-magnetic stainless steel ring 23 in each magnetic ring assembly 2 effectively shields stray magnetic fields, preventing interference with the active magnetic bearing displacement sensor and control system in the magnetic levitation system. Additionally, the boss 1 ensures that it does not interfere with the operation of the rolling element 7 of the protective bearing 8 located between the inner and outer rings, without occupying additional space.

[0049] In summary, this embodiment achieves contactless and slip-free synchronous rotation between the inner ring 3 of the protective bearing and the rotor 5 through the collaborative design of the boss 1 and the two magnetic ring assemblies 2. When the active magnetic bearing in the magnetic levitation system fails and the rotor 5 falls, there is no slip contact between the inner ring 3 of the protective bearing and the rotor 5, which effectively reduces the high-temperature wear caused by the rotor 5 falling onto the protective bearing 8 and reduces the risk of slippage friction. Furthermore, the synchronous rotation of the two magnetic ring assemblies 2 has no electromagnetic loss, preventing the protective bearing 8 from overheating and extending its service life. There is no need to magnetize the entire inner ring 3 of the protective bearing, preventing the inner ring 3 of the protective bearing from adsorbing iron filings and abrasive particles, reducing the wear of the protective bearing 8, and preventing stray magnetic fields from interfering with other equipment, thus avoiding affecting the control accuracy of the magnetic levitation system. It can meet the long-term stable operation requirements of the magnetic levitation system. In addition, the two magnetic ring assemblies 2 in this device are modularly designed, requiring little modification to the manufacturing process of the protective bearing, and have a simple structure that is easy to implement.

[0050] System Implementation Example: This embodiment also proposes a magnetic levitation system, see [link to documentation]. Figure 1 The magnetic levitation system includes: a rotor 5, two protective bearings 8, and two self-synchronizing devices for the protective bearings of any of the aforementioned magnetic levitation systems. The two protective bearings 8 are respectively located at two ends of the rotor 5. The self-synchronizing devices for the two protective bearings correspond one-to-one with the two protective bearings 8, with each self-synchronizing device located at its corresponding protective bearing 8.

[0051] It should be noted that, see Figure 1The magnetic levitation system also includes two magnetic levitation bearings 4. The two magnetic levitation bearings 4 are respectively disposed at two ends of the rotor 5, and each magnetic levitation bearing 4 corresponds one-to-one with two protective bearings 8. Each magnetic levitation bearing 4 is disposed inside the corresponding protective bearing 8, while the self-synchronization device of each protective bearing of the magnetic levitation system is disposed outside the corresponding protective bearing 8. The specific structure of the magnetic levitation bearings 4 can be referred to the description of the structure of magnetic levitation systems in the prior art, and will not be repeated here.

[0052] It should be noted that the magnetic levitation system may also include other structures. For details on the specific structure of the magnetic levitation system, please refer to the description in the prior art. This embodiment will not elaborate further here.

[0053] The specific implementation process of the self-synchronization device for protecting the bearings of the magnetic levitation system can be found in the above description, and will not be repeated here in this embodiment.

[0054] Since the self-synchronization device for protecting the bearings of a magnetic levitation system has the aforementioned effects, a magnetic levitation system with the self-synchronization device for protecting the bearings of such a magnetic levitation system also has the corresponding technical effects.

[0055] It should be noted that the self-synchronization device for protecting the bearing in the magnetic levitation system of this invention is based on the same principle as the magnetic levitation system itself, and related aspects can be referred to each other.

[0056] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate the direction or positional relationship, are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0057] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A self-synchronizing device for protecting bearings in a magnetic levitation system, characterized in that, include: A circular boss (1) and two magnetic ring assemblies (2); wherein, The boss (1) protrudes from the inner ring (3) of the protective bearing in the magnetic levitation system on the side away from the magnetic levitation bearing (4); One of the magnetic ring assemblies (2) is sleeved on the outside of the boss (1), and the other magnetic ring assembly (2) is sleeved on the outside of the bushing (6) of the rotor (5) in the magnetic levitation system. The two magnetic ring assemblies (2) are arranged opposite to each other and spaced apart by a preset distance to form an axial air gap. The two magnetic ring assemblies (2) are used to generate tangential torque when the rotor (5) rotates, so as to drive the inner ring (3) of the protective bearing to rotate synchronously with the rotor (5).

2. The self-synchronization device for protecting bearings in a magnetic levitation system according to claim 1, characterized in that, The two magnetic ring assemblies (2) are positioned correspondingly and their structural parameters are matched.

3. The self-synchronization device for protecting the bearings of a magnetic levitation system according to claim 2, characterized in that, Each of the magnetic ring assemblies (2) includes: a plurality of magnets (21) and a non-magnetic sleeve (22) and a collar (23); wherein, The sleeve (22) is fitted onto the outside of the boss (1) or the bushing (6); Each of the magnets (21) is disposed at intervals along the circumferential direction of the sleeve (22) on the outer wall of the sleeve (22), and a non-magnetic filler is filled between two adjacent magnets (21). The magnetic poles of each magnet (21) are alternately distributed along the circumferential direction of the sleeve (22) at any end face of the sleeve (22). The collar (23) is fitted onto the outside of each of the magnets (21); The positions of each magnet (21) in the two magnetic ring assemblies (2) correspond one-to-one, and the magnetic poles of the two magnets (21) at the corresponding positions are opposite on their opposite end faces.

4. The self-synchronization device for protecting the bearings of a magnetic levitation system according to claim 3, characterized in that, Each of the magnets (21) is axially multipole magnetized, and the magnetization direction is the axial direction of the rotor (5); and / or, Each of the magnets (21) is made of ferrite or high-performance rare earth permanent magnet material.

5. The self-synchronization device for protecting the bearings of a magnetic levitation system according to claim 3, characterized in that, The sleeve (22) is connected to the boss (1) or the bushing (6) by an interference fit and is pressed by a heat fitting process; The collar (23) and each of the magnets (21) are connected by an interference fit.

6. The self-synchronization device for protecting the bearings of a magnetic levitation system according to claim 1, characterized in that, The axial air gap between the two magnetic ring assemblies (2) is 1.0 mm to 2.5 mm.

7. The self-synchronization device for protecting bearings in a magnetic levitation system according to claim 1, characterized in that, The magnetic ring assembly (2) located at the boss (1) has an axial clearance of greater than or equal to 1.5 mm between it and the protective bearing (8).

8. The self-synchronization device for protecting the bearings of a magnetic levitation system according to claim 1, characterized in that, The outer wall surface of the boss (1) has a preset roughness.

9. The self-synchronization device for protecting bearings in a magnetic levitation system according to claim 1, characterized in that, The outer diameter of the boss (1) is smaller than the outer diameter of the inner ring (3) of the protective bearing; The connection between the boss (1) and the inner ring (3) of the protective bearing is a rounded transition.

10. A magnetic levitation system, characterized in that, include: The rotor (5), two protective bearings (8), and two self-synchronizing devices for the magnetic levitation system protective bearings as described in any one of claims 1 to 9; wherein, The two protective bearings (8) are respectively disposed at the two ends of the rotor (5); The self-synchronization devices of the two magnetic levitation system protection bearings are respectively installed at the two protection bearings (8).

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