CN221401372U - Axial magnetic bearing structure of magnetic bearing - Google Patents

Abstract

The utility model relates to the technical field of magnetic suspension bearings, in particular to an axial magnetic bearing structure of a magnetic suspension bearing, which comprises a bearing sleeve, wherein a stator yoke is fixedly connected inside the bearing sleeve, an excitation winding is wound inside the stator yoke, a rotating shaft is magnetically connected inside the excitation winding, and one end of the bearing sleeve is provided with an energy reduction assembly for improving the axial supporting force of the rotating shaft and reducing the energy consumption of the excitation winding. According to the utility model, the mechanical structure can be utilized to replace the traditional electromagnetic force to provide axial supporting force for the rotating shaft through the energy reducing component, so that the energy consumption of the exciting winding can be reduced, the overall efficiency and the energy utilization rate can be improved, the magnetic suspension bearing can be more energy-saving and efficient in working, the supporting force of the rotating shaft is increased, and meanwhile, the axial positioning precision of the rotating shaft can be improved while the axial supporting force of the rotating shaft is assisted through the auxiliary component, so that the stability of the bearing is improved.

Description

Axial magnetic bearing structure of magnetic bearing

Technical Field

The utility model relates to the technical field of magnetic suspension bearings, in particular to an axial magnetic bearing structure of a magnetic suspension bearing.

Background technique

Magnetic bearing technology uses the electromagnetic force between the stator and rotor to suspend the rotor in space, thereby avoiding mechanical contact between the stator and rotor. It is a new type of high-performance bearing. Since there is no mechanical friction between the stator and rotor, the bearing rotor can withstand very high speeds, has the advantages of long life, low energy consumption, no lubrication, and no pollution. It has irreplaceable advantages in special applications such as high speed, vacuum, and ultra-clean. Axial magnetic bearings use the electromagnetic force between the thrust plate structure and the magnetic field generated by the electric excitation to provide axial bearing capacity.

In the prior art, for example, the Chinese patent number CN217682845U discloses a "magnetic suspension bearing system", which includes a rotating shaft, an axial magnetic bearing, and a radial magnetic bearing. The axial magnetic bearing and the radial magnetic bearing are both sleeved on the outer periphery of the rotating shaft. The axial magnetic bearing includes an axial magnetic bearing stator, and the radial magnetic bearing includes a radial magnetic bearing stator and a radial magnetic bearing rotor. Although the utility model effectively combines the radial magnetic bearing with the axial magnetic bearing to form an integrated shaft and radial integrated magnetic bearing structure, thereby reducing the axial size of the rotor and solving the problem of low fixed frequency of the rotor, the technology is consistent with the traditional method in that when the existing axial magnetic bearing is in use, an electromagnetic force is used to provide axial support force for the rotating shaft, so a large amount of electromagnetic force is required to provide axial support force for the rotating shaft. This not only consumes energy, but also causes a loss to the internal electromagnetic equipment, thereby leading to the problem of low service life of the bearing. At the same time, because the axial magnetic bearing in the traditional technology is supported by electromagnetic force, the axial support force of the axial magnetic bearing on the rotating shaft is relatively low, which limits the bearing capacity of the bearing and is not suitable for bearing high loads of large mechanical equipment.

Utility Model Content

In view of this, the purpose of the present invention is to propose an axial magnetic bearing structure of a magnetic suspension bearing to solve the problems of severe electromagnetic loss and low bearing capacity of existing axial magnetic bearings.

Based on the above purpose, the utility model provides an axial magnetic bearing structure of a magnetic suspension bearing, including a bearing sleeve, a stator yoke is fixedly connected to the inside of the bearing sleeve, an excitation winding is wound inside the stator yoke, the inside of the excitation winding is magnetically connected to a rotating shaft, one end of the bearing sleeve is provided with an energy reduction component for increasing the axial supporting force of the rotating shaft and reducing the energy consumption of the excitation winding, the energy reduction component includes a turntable, a trapezoidal block, a fixed disk and a fixed card, one end of the bearing sleeve is rotatably connected to the fixed disk through a rotating cylinder, one side of the fixed disk is rotatably connected to the turntable, a hexagonal groove is formed on the side of the turntable opposite to the fixed disk, a slider is slidably connected to the inside of the hexagonal groove, and the end of the slider away from the hexagonal groove is rotatably connected to A trapezoidal block, wherein a stop block is fixedly connected to the middle part of the long side of the trapezoidal block, and a plurality of extrusion springs are fixedly connected to the side of the stop block away from the long side, and a fixing card is fixedly connected to the side of the plurality of extrusion springs away from the stop block. An auxiliary component for assisting the axial supporting force of the rotating shaft is also provided at the end of the bearing sleeve away from the energy reduction component, and the auxiliary component comprises a connecting disk, an upper spring sheet, a lower spring sheet, a limiting cylinder and a ball block. A connecting disk is fixedly connected to the inside of the bearing sleeve away from the energy reduction component, and a plurality of upper spring sheets are fixedly connected to the inside of the connecting disk, and a plurality of lower spring sheets are fixedly connected to one side of the plurality of upper spring sheets, and a plurality of lower spring sheets are fixedly connected to the inside of the limiting cylinder, and a ball block is rotatably connected to the inside of the limiting cylinder away from the end of the lower spring sheet.

Preferably, an annular clip is fixedly connected to the outside of one end of the rotating cylinder, and a sliding groove adapted to the annular clip is provided inside one end of the bearing sleeve, and the annular clip has an L-shaped shape.

Preferably, a threaded cylinder is fixedly connected to one side of the rotating cylinder, and a threaded groove is opened inside one end of the threaded cylinder, and a bolt cylinder is fixedly connected to the outside of one end of the turntable, and the end of the bolt cylinder away from the turntable is threadedly connected to the inside of the threaded groove, and the bolt cylinder is sleeved on the outside of the rotating cylinder.

Preferably, there are six trapezoidal blocks, a plurality of bolt grooves are provided inside the fixed plate, one side of each of the six trapezoidal blocks is fixedly connected with a fixing bolt, and one end of the fixing bolt away from the trapezoidal block is slidably connected to the inside of the bolt groove, and the long edges and slope edges of the six trapezoidal blocks are in contact with each other.

Preferably, a first sleeve is fixedly connected to the outside of one end of the rotating shaft, a clamp is fixedly connected to the outside of the first sleeve, a clamp is provided inside one side of the fixed clamp, and the size of the clamp is matched with the size of the clamp.

Preferably, a fixing ring is sleeved on the outside of the ball block, a hole is opened inside the fixing ring, and the shape of the hole is a conical column.

Preferably, there are multiple fixing rings, and the multiple fixing rings are connected to each other through arc blocks.

Preferably, the lower spring piece has a semi-arc shape, and there are multiple semi-arc lower spring pieces, and both ends of the multiple semi-arcs are connected to each other, and the upper spring piece has a semi-arc shape opposite to the lower spring piece.

Preferably, an anti-wear spring is fixedly connected to the inside of the limit cylinder, one end of the anti-wear spring is connected to one side of the ball block, the outside of the rotating shaft away from one end of the first ring is fixedly connected to the second ring, and the outside of the second ring is fixedly connected to a plurality of semi-circular balls, and the positions of the plurality of semi-circular balls are staggered with the positions of the plurality of ball blocks.

The beneficial effects of the utility model are as follows: 1. By setting up the energy reduction component, the mechanical structure can be used to replace the traditional electromagnetic force to provide axial support force for the rotating shaft, thereby reducing the energy consumption of the excitation winding, which is helpful to improve the overall efficiency and energy utilization rate, making the magnetic suspension bearing more energy-efficient and efficient during operation, while extending the service life of the bearing and increasing the support force of the rotating shaft. During installation, the turntable is rotated to cause the slider on one side of the trapezoidal block to slide in the hexagonal groove, and at the same time, the fixing bolt on the other side of the trapezoidal block to slide in the bolt groove. At this time, multiple trapezoidal blocks will rotate, and at the same time, multiple trapezoidal blocks will squeeze the spring, causing the fixing clamp to be clamped on the outside of the clamp ring. This will prompt the fixing card to fix the rotating shaft, thus avoiding the problem of traditionally using electromagnetic force to provide axial support for the rotating shaft. At the same time, when the turntable rotates, the bolt tube will be fixed to the inside of the threaded tube by the action of the thread, thereby fixing the position of the turntable and the trapezoidal block. At the same time, the rotating tube is rotatably connected to one end of the bearing sleeve through the annular card, which can drive the energy reduction component to rotate, thus avoiding the problem of the energy reduction component affecting the rotation of the rotating shaft. At the same time, the extrusion spring can prompt the rotating shaft to be flexibly connected, thereby making the bearing more stable during operation, and ensuring long-term and high-load operation of the equipment.

2. The auxiliary component provided can not only assist the axial supporting force of the rotating shaft, but also improve the axial positioning accuracy of the rotating shaft, thereby improving the working accuracy and stability of the magnetic bearing. When in use, the upper spring sheet and the lower spring sheet can play the role of supporting the limit cylinder. At the same time, the elastic structure can avoid the position deformation of the limit cylinder. At the same time, the multiple ball blocks provided are in contact with the outside of one end of the rotating shaft, which can not only play the role of supporting the rotating shaft, but also do not affect the rotation of the rotating shaft. In this way, the auxiliary component cooperates with the energy reduction component to improve the axial supporting force of the rotating shaft and significantly enhance the bearing capacity of the bearing, so that the magnetic bearing can withstand a larger load and is suitable for more engineering applications. At the same time, the anti-wear spring and semi-circular ball are provided, when the rotating shaft rotates, the semi-circular ball will squeeze the ball block, thereby prompting the ball block to shrink by utilizing the effect of the squeezing spring, thereby reducing the wear of the ball block and extending the service life of the magnetic bearing.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of the overall three-dimensional structure of the utility model;

Figure 2 is a schematic diagram of the overall cross-sectional three-dimensional structure of the utility model;

FIG3 is a schematic diagram of the three-dimensional structure of the auxiliary component of the utility model;

FIG4 is a schematic diagram of a cross-sectional three-dimensional structure of an auxiliary component of the utility model;

FIG5 is a schematic diagram of the three-dimensional structure of the energy reduction component of the utility model;

FIG. 6 is a schematic diagram of the internal structure of the energy reduction component of the present invention.

The markings in the figure are:

1. Bearing sleeve; 2. Stator yoke; 3. Field winding; 4. Rotating shaft; 5. Threaded cylinder; 6. Rotating plate; 7. Bolt cylinder; 8. Ring clamp; 9. Hexagonal groove; 10. Trapezoidal block; 11. Fixed disk; 12. Bolt groove; 13. Fixed bolt; 14. Stop block; 15. Extrusion spring; 16. Fixed clamp; 17. Rotating cylinder; 18. First set of rings; 19. Snap ring; 20. Connecting disk; 21. Upper spring piece; 22. Lower spring piece; 23. Limit cylinder; 24. Fixed ring; 25. Ball block; 26. Arc block; 27. Second set of rings; 28. Semicircular ball; 29. Anti-wear spring.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

Referring to the utility model shown in Figures 1 to 6, an axial magnetic bearing structure of a magnetic suspension bearing is provided, including a bearing sleeve 1, a stator yoke 2 is fixedly connected to the inside of the bearing sleeve 1, an excitation winding 3 is wound inside the stator yoke 2, and the inside of the excitation winding 3 is magnetically connected to a rotating shaft 4. One end of the bearing sleeve 1 is provided with an energy reduction component for increasing the axial support force of the rotating shaft 4 and reducing the energy consumption of the excitation winding 3. The energy reduction component includes a turntable 6, a trapezoidal block 10, a fixed disk 11 and a fixed card 16. One end of the bearing sleeve 1 is rotatably connected to the fixed disk 11 through a rotating cylinder 17, and one side of the fixed disk 11 is rotatably connected to the turntable 6. A hexagonal groove 9 is provided on the side opposite to the fixed disk 11, and a slider is slidably connected to the inside of the hexagonal groove 9. The end of the slider away from the hexagonal groove 9 is rotatably connected to the trapezoidal block 10 through an axis. A stop block 14 is fixedly connected to the middle of the long side of the block 10, and a plurality of extrusion springs 15 are fixedly connected to the side of the stop block 14 away from the long side, and a fixing card 16 is fixedly connected to the side of the plurality of extrusion springs 15 away from the stop block 14. An auxiliary component for assisting the axial support force of the rotating shaft 4 is also provided at the end of the bearing sleeve 1 away from the energy reduction component, and the auxiliary component includes a connecting disk 20, an upper spring piece 21, a lower spring piece 22, a limiting cylinder 23 and a ball block 25. The interior of the bearing sleeve 1 away from the energy reduction component is fixedly connected to the connecting disk 20, and a plurality of upper spring pieces 21 are fixedly connected to the interior of the connecting disk 20, and a plurality of lower spring pieces 22 are fixedly connected to the interior of the plurality of lower spring pieces 22. The interior of the plurality of lower spring pieces 22 is fixedly connected to the limiting cylinder 23, and the interior of the limiting cylinder 23 away from the end of the lower spring piece 22 is rotatably connected to the ball block 25.

By setting up the energy reduction component, a mechanical structure can be used to replace the traditional electromagnetic force to provide axial support force for the rotating shaft 4, thereby reducing the energy consumption of the excitation winding 3, which is helpful to improve the overall efficiency and energy utilization rate, and make the magnetic suspension bearing more energy-saving and efficient during operation, while extending the service life of the bearing and increasing the support force of the rotating shaft 4. During installation, the turntable 6 is rotated to cause the slider on one side of the trapezoidal block 10 to slide in the hexagonal groove 9, and at the same time, the fixing bolt 13 on the other side of the trapezoidal block 10 is caused to slide in the bolt groove 12. At this time, multiple trapezoidal blocks 10 will rotate, and at the same time, multiple trapezoidal blocks 10 will squeeze the spring 15, causing the fixing card 16 to be stuck on the outside of the retaining ring 19, and then causing the fixing card 16 to fix the rotating shaft 4, thereby avoiding the problem of traditional need to use electromagnetic force to provide axial support force for the rotating shaft 4.

As shown in Figures 1, 2, 5 and 6, an annular clip 8 is fixedly connected to the outside of one end of the rotating cylinder 17, and a sliding groove adapted to the annular clip 8 is opened inside one end of the bearing sleeve 1. The annular clip 8 is L-shaped in shape. A threaded cylinder 5 is fixedly connected to one side of the rotating cylinder 17, and a threaded groove is opened inside one end of the threaded cylinder 5. A bolt cylinder 7 is fixedly connected to the outside of one end of the rotating disk 6. The end of the bolt cylinder 7 away from the rotating disk 6 is threadedly connected to the inside of the threaded groove, and the bolt cylinder 7 is sleeved on the outside of the rotating cylinder 17. At the same time, through the set annular clip 8, when the rotating disk 6 rotates, the bolt cylinder 7 will be fixed to the inside of the threaded cylinder 5 by the effect of the thread, thereby fixing the position of the rotating disk 6 and the trapezoidal block 10. At the same time, the rotating cylinder 17 is rotatably connected to one end of the bearing sleeve 1 through the annular clip 8, which can promote the rotation to drive the energy reduction component to rotate, thereby avoiding the problem of the energy reduction component affecting the rotation of the rotating shaft 4.

As shown in Figures 1, 2, 5 and 6, there are six trapezoidal blocks 10, and a plurality of bolt grooves 12 are provided inside the fixed disk 11. A fixing bolt 13 is fixedly connected to one side of each of the six trapezoidal blocks 10, and the fixing bolt 13 is slidably connected to the inside of the bolt groove 12 at one end away from the trapezoidal block 10. The long edges of the six trapezoidal blocks 10 are in contact with the slope edges. A first sleeve 18 is fixedly connected to the outside of one end of the rotating shaft 4, and a retaining ring 19 is fixedly connected to the outside of the first sleeve 18. A retaining groove is provided inside one side of the fixed clamp 16, and the specifications and dimensions of the retaining groove are adapted to those of the retaining ring 19. By providing the six trapezoidal blocks 10 and the extrusion spring 15, the rotating shaft 4 can be flexibly connected, thereby making the bearing more stable during operation, and ensuring that the equipment can operate for a long time and at a high load.

As shown in Figures 1 to 4, a fixing ring 24 is sleeved on the outside of the ball block 25, and a hole is opened inside the fixing ring 24, and the shape of the hole is a conical column shape. There are multiple fixing rings 24, and the multiple fixing rings 24 are connected to each other through an arc block 26. There are multiple fixing rings 24, and the multiple fixing rings 24 are connected to each other through the arc block 26. The shape of the lower spring piece 22 is semi-arc-shaped, and the number of the semi-arc lower spring pieces 22 is multiple, and the two ends of the multiple semi-arcs are connected to each other. The shape of the upper spring piece 21 is a semi-arc shape opposite to the lower spring piece 22. An anti-wear spring 29 is fixedly connected to the inside of the limit cylinder 23, and one end of the anti-wear spring 29 is connected to one side of the ball block 25. A second ring 27 is fixedly connected to the outside of the rotating shaft 4 away from one end of the first ring 18, and a plurality of semi-circular balls 28 are fixedly connected to the outside of the second ring 27. The positions of the multiple semi-circular balls 28 are staggered with the positions of the multiple ball blocks 25.

The auxiliary components provided can not only assist the axial support force of the rotating shaft 4, but also improve the axial positioning accuracy of the rotating shaft 4, thereby improving the working accuracy and stability of the magnetic bearing. When in use, the upper spring sheet 21 and the lower spring sheet 22 can play the role of supporting the limiting cylinder 23. At the same time, the elastic structure can avoid the position deformation of the limiting cylinder 23. At the same time, the multiple ball blocks 25 provided are in contact with the outside of one end of the rotating shaft 4, which can not only support the rotating shaft 4, but also do not affect the rotation of the rotating shaft 4. In this way, the auxiliary components cooperate with the energy reduction components to improve the axial support force of the rotating shaft 4 and can also significantly The bearing capacity of the bearing is enhanced, so that the magnetic bearing can withstand a larger load and is suitable for more engineering applications. At the same time, through the anti-wear spring 29 and the semi-circular ball 28, when the shaft 4 rotates, the semi-circular ball 28 will squeeze the ball block 25, thereby prompting the ball block 25 to shrink by the action of the squeezing spring 15, thereby reducing the wear of the ball block 25 and extending the service life of the magnetic bearing. At the same time, the fixed ring 24 can play a role in fixing the ball block 25, avoiding the falling off of the ball block 25. At the same time, the arc block 26 can prompt the fixed ring 24 to pull each other, avoiding the problem of displacement of the ball block 25.

Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

The utility model is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims (9)

1. An axial magnetic bearing structure of a magnetic suspension bearing, comprising a bearing sleeve (1), wherein a stator yoke (2) is fixedly connected to the interior of the bearing sleeve (1), an excitation winding (3) is wound inside the stator yoke (2), and the interior of the excitation winding (3) is magnetically connected to a rotating shaft (4), characterized in that an energy reduction component for increasing the axial support force of the rotating shaft (4) and reducing the energy consumption of the excitation winding (3) is provided at one end of the bearing sleeve (1); The energy reduction component comprises a rotating disk (6), a trapezoidal block (10), a fixed disk (11) and a fixed clamp (16); one end of the bearing sleeve (1) is rotatably connected to the fixed disk (11) via a rotating cylinder (17); one side of the fixed disk (11) is rotatably connected to the rotating disk (6); a hexagonal groove (9) is provided on the side of the rotating disk (6) opposite to the fixed disk (11); a slider is slidably connected inside the hexagonal groove (9); an end of the slider away from the hexagonal groove (9) is rotatably connected to the trapezoidal block (10) via an axis; a stop block (14) is fixedly connected to the middle of the long side of the trapezoidal block (10); a plurality of extrusion springs (15) are fixedly connected to the side of the stop block (14) away from the long side; and a fixing clamp (16) is fixedly connected to the side of the plurality of extrusion springs (15) away from the stop block (14); An auxiliary component for assisting the axial supporting force of the rotating shaft (4) is also arranged at one end of the bearing sleeve (1) away from the energy reduction component, the auxiliary component comprising a connecting disk (20), an upper spring sheet (21), a lower spring sheet (22), a limiting cylinder (23) and a ball block (25); the end of the bearing sleeve (1) away from the energy reduction component is fixedly connected to the inside of the connecting disk (20); a plurality of upper spring sheets (21) are fixedly connected to the inside of the connecting disk (20); a plurality of lower spring sheets (22) are fixedly connected to the inside of the plurality of lower spring sheets (22); a limiting cylinder (23) is fixedly connected to the inside of the limiting cylinder (23) away from the end of the lower spring sheet (22) in a rotatable manner. 2. The axial magnetic bearing structure of the magnetic levitation bearing according to claim 1 is characterized in that an annular clip (8) is fixedly connected to the outside of one end of the rotating cylinder (17), and a sliding groove adapted to the annular clip (8) is opened inside one end of the bearing sleeve (1), and the annular clip (8) has an L-shaped shape. 3. The axial magnetic bearing structure of the magnetic levitation bearing according to claim 1 is characterized in that a threaded cylinder (5) is fixedly connected to one side of the rotating cylinder (17), and a threaded groove is opened inside one end of the threaded cylinder (5), and a bolt cylinder (7) is fixedly connected to the outside of one end of the turntable (6), and the end of the bolt cylinder (7) away from the turntable (6) is threadedly connected to the inside of the threaded groove, and the bolt cylinder (7) is sleeved on the outside of the rotating cylinder (17). 4. The axial magnetic bearing structure of the magnetic levitation bearing according to claim 1 is characterized in that there are six trapezoidal blocks (10), a plurality of bolt grooves (12) are provided inside the fixed plate (11), one side of the six trapezoidal blocks (10) is fixedly connected with a fixing bolt (13), and the end of the fixing bolt (13) away from the trapezoidal block (10) is slidably connected to the inside of the bolt groove (12), and the long edges and slope edges of the six trapezoidal blocks (10) are in contact with each other. 5. The axial magnetic bearing structure of the magnetic bearing according to claim 1 is characterized in that a first sleeve (18) is fixedly connected to the outside of one end of the rotating shaft (4), a retaining ring (19) is fixedly connected to the outside of the first sleeve (18), and a retaining groove is provided inside one side of the fixed clamp (16), and the specification size of the retaining groove is compatible with the specification size of the retaining ring (19). 6. The axial magnetic bearing structure of the magnetic bearing according to claim 1 is characterized in that a fixing ring (24) is sleeved on the outside of the ball block (25), a hole is opened inside the fixing ring (24), and the shape of the hole is a conical column. 7. The axial magnetic bearing structure of the magnetic suspension bearing according to claim 6 is characterized in that there are multiple fixing rings (24), and the multiple fixing rings (24) are connected to each other through arc blocks (26). 8. The axial magnetic bearing structure of the magnetic levitation bearing according to claim 1 is characterized in that the lower spring piece (22) has a semi-arc shape, and there are multiple semi-arc lower spring pieces (22), and the two ends of the multiple semi-arcs are connected to each other, and the upper spring piece (21) has a semi-arc shape opposite to the lower spring piece (22). 9. The axial magnetic bearing structure of the magnetic levitation bearing according to claim 1 is characterized in that an anti-wear spring (29) is fixedly connected to the inside of the limit cylinder (23), one end of the anti-wear spring (29) is connected to one side of the ball block (25), and the outside of the rotating shaft (4) away from the end of the first ring (18) is fixedly connected to the second ring (27), and the outside of the second ring (27) is fixedly connected to a plurality of semi-circular balls (28), and the positions of the plurality of semi-circular balls (28) are staggered with the positions of the plurality of ball blocks (25).