Axial permanent magnet suspension bearing based on electromagnetic suspension and control system thereof

Abstract

The invention relates to an axial permanent magnet suspension bearing based on electromagnetic suspension and a control system thereof, the axial permanent magnet suspension bearing comprises an axial permanent magnet suspension bearing stator, an axial permanent magnet suspension bearing rotor, a load, an axial permanent magnet bearing and two radial electromagnetic bearings, the axial permanent magnet suspension bearing rotor and the radial electromagnetic bearings are both mounted in the axial permanent magnet suspension bearing stator; the axial permanent magnet bearing is installed on the axial permanent magnet suspension bearing rotor, the axial permanent magnet suspension bearing rotor is connected with a load, the axial permanent magnet suspension bearing rotor penetrates through the radial electromagnetic bearings and the axial permanent magnet bearing, and the radial electromagnetic bearings are located on the two sides of the axial permanent magnet bearing. Axial suspension is realized through relative movement among a plurality of annular permanent magnets of the axial permanent magnet bearing. The radial control of the axial permanent magnet suspension bearing is realized, so that the axial permanent magnet suspension bearing designed based on a permanent magnet array suspension structure can work in an optimal suspension gap, and the buoyancy-weight ratio is greatly improved in the axial direction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of suspension bearings, in particular to an axial permanent magnetic suspension bearing based on electromagnetic suspension and a control system thereof. BACKGROUND

[0002] The existing magnetic suspension bearing has problems of complex control system, large energy consumption and low float-to-weight ratio in axial support. When the electromagnetic suspension mode is used for axial support, it has the advantages of large stiffness and adjustable electromagnetic force, but the suspension control system needs to be designed, which increases the complexity of the system and the energy consumption of the system is also larger. When the permanent magnetic suspension mode is used for axial support, most of them are based on the principle of repulsion between permanent magnets of the same kind, which has the advantage of low energy consumption, but the carrying capacity is weak and the suspension stiffness is small. When the hybrid suspension mode is used for axial support, compared with permanent magnetic suspension, it can increase the carrying capacity to a certain extent, but the non-linear characteristics increase the control difficulty.

[0003] The patent for invention with publication number CN116398538A discloses a permanent magnetic bias radial magnetic suspension bearing and a magnetic suspension rotating machine. The radial magnetic suspension bearing comprises a stator assembly, a main shaft and a control unit. The stator assembly comprises an end magnetic guide plate, a permanent magnet assembly and a stator core with a control coil embedded in sequence along the up and down coaxial stacking. The main shaft is coaxially inserted into the stator assembly, and the outer peripheral wall of the main shaft and the inner peripheral end surface of the end magnetic guide plate form an end air gap, and the outer peripheral wall of the main shaft and the inner peripheral end of the stator core form an electromagnet air gap. The control unit drives the control coil to generate control current in positive and negative directions. The patent cannot provide good axial support.

[0004] Therefore, it is currently urgent to provide a bearing that can better provide axial support. SUMMARY

[0005] The present application relates to the technical field of suspension bearings, in particular to an axial permanent magnetic suspension bearing based on electromagnetic suspension and a control system thereof.

[0006] The present application relates to the technical field of suspension bearings, in particular to an axial permanent magnetic suspension bearing based on electromagnetic suspension and a control system thereof.

[0007] According to one aspect of the present application, an axial permanent magnetic levitation bearing based on electromagnetic suspension is provided, comprising an axial permanent magnetic levitation bearing stator, an axial permanent magnetic levitation bearing rotor, a load, an axial permanent magnetic bearing, and two radial electromagnetic bearings, the axial permanent magnetic levitation bearing rotor and the radial electromagnetic bearings are both installed in the axial permanent magnetic levitation bearing stator, the axial permanent magnetic bearing is installed on the axial permanent magnetic levitation bearing rotor, the axial permanent magnetic levitation bearing rotor is connected with the load, the axial permanent magnetic levitation bearing rotor passes through the radial electromagnetic bearings and the axial permanent magnetic bearing, the radial electromagnetic bearings are located on both sides of the axial permanent magnetic bearing, and the axial levitation is realized through the relative movement between the plurality of annular permanent magnets of the axial permanent magnetic bearing.

[0008] As a preferred technical solution, the radial electromagnetic bearing comprises a radial electromagnetic bearing stator and a radial electromagnetic bearing coil, the radial electromagnetic bearing stator is connected with the axial permanent magnetic levitation bearing stator, and the radial electromagnetic bearing coil is installed on the radial electromagnetic bearing stator and is arranged at intervals with the axial permanent magnetic levitation bearing rotor as the center.

[0009] As a preferred technical solution, the axial permanent magnetic levitation bearing rotor comprises a rotating shaft, a thrust disc, and a magnetic conducting ring, the rotating shaft passes through the radial electromagnetic bearings and the axial permanent magnetic bearing, the thrust disc and the magnetic conducting ring are both installed on the rotor, and the magnetic conducting ring is in the same plane as the radial electromagnetic bearing.

[0010] As a preferred technical solution, the axial permanent magnetic levitation bearing further comprises a partition plate, the partition plate is installed on the axial permanent magnetic levitation bearing stator, and the partition plate is located in the middle of the two radial electromagnetic bearings.

[0011] As a preferred technical solution, the axial permanent magnetic bearing comprises a second annular permanent magnet and two groups of first annular permanent magnets, the second annular permanent magnet is installed in the middle of the first annular permanent magnets, the first annular permanent magnets are installed on the partition plate, and the second annular permanent magnet is installed on the thrust disc.

[0012] As a preferred technical solution, the second annular permanent magnet and the two groups of first annular permanent magnets are in non-contact engagement.

[0013] The first annular permanent magnet and the second annular permanent magnet both comprise a plurality of layers of magnetic poles, and the plurality of layers of magnetic poles of the first annular permanent magnet and the second annular permanent magnet are arranged in different manners.

[0014] As a preferred technical solution, the axial permanent magnetic bearing further comprises a partition plate, the partition plate is installed in the middle of adjacent magnetic poles of the first annular permanent magnet and the second annular permanent magnet.

[0015] As a preferred technical scheme, the axial permanent magnetic bearing further comprises an anti-suction cover, the anti-suction cover is installed on the first annular permanent magnet and the second annular permanent magnet, and the anti-suction cover is connected with the partition plate or the thrust disc respectively.

[0016] According to another aspect of the present application, a control system for the electromagnetic suspension based axial permanent magnetic suspension bearing is provided, the control system comprises a suspension controller, a displacement sensor and a current sensor, the suspension controller, the displacement sensor and the current sensor are connected with the axial permanent magnetic suspension bearing, and the suspension controller is used for radial position control of the axial permanent magnetic suspension bearing.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] 1. The axial permanent magnetic bearing and two radial electromagnetic bearings are cooperated to realize the radial control of the axial permanent magnetic suspension bearing, so that the axial permanent magnetic suspension bearing based on the permanent magnetic array suspension structure design can work in the optimal suspension gap, and the float-to-weight ratio is greatly improved in the axial direction.

[0019] 2. The second annular permanent magnet and two groups of first annular permanent magnets are arranged, under the action of the load, the second annular permanent magnet enters or moves away from the first annular permanent magnet, and the suspension position is controlled according to the change of the magnetic pole.

[0020] 3. The multi-layer magnetic pole arrangement modes of the first annular permanent magnet and the second annular permanent magnet are different, so that the second annular permanent magnet is displaced under the action of the load, the magnetic field force received is different, and the suspension position is controlled.

[0021] 4. The anti-suction cover is installed on the surfaces of the first annular permanent magnet and the second annular permanent magnet, so as to prevent the first annular permanent magnet and the second annular permanent magnet from being directly sucked. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a whole structure schematic view of the present application;

[0023] Figure 2 It is a top view of the radial electromagnetic bearing structure of the present application;

[0024] Figure 3 It is a structure schematic view of the axial permanent magnetic bearing of the present application;

[0025] Figure 4 It is a first magnetizing mode schematic view of the present application;

[0026] Figure 5 It is a second magnetizing mode schematic view of the present application;

[0027] 1. axial permanent magnetic suspension bearing stator; 2. radial electromagnetic bearing; 3. axial permanent magnetic suspension bearing rotor; 4. load; 5. axial permanent magnetic bearing; 6. partition plate; 21. radial electromagnetic bearing stator; 22. radial electromagnetic bearing coil; 31. rotating shaft; 32. thrust disc; 33. magnetic conducting ring; 51. first annular permanent magnet; 52. second annular permanent magnet; S. S pole of permanent magnet; N. N pole of permanent magnet. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the present application.

[0029] The axial permanent magnetic suspension bearing is designed based on the permanent magnetic array suspension structure, and the radial control of the magnetic suspension bearing is realized by arranging the radial electromagnetic suspension bearings at both ends of the rotating shaft, so that the axial permanent magnetic suspension bearing designed based on the permanent magnetic array suspension structure can work in the optimal suspension gap, and the floating-to-weight ratio is greatly improved in the axial direction.

[0030] Embodiment 1

[0031] As Figures 1-5 described, an axial permanent magnetic suspension bearing based on electromagnetic suspension includes an axial permanent magnetic suspension bearing stator 1, an axial permanent magnetic suspension bearing rotor 3, a load 4, an axial permanent magnetic bearing 5, and two radial electromagnetic bearings 2. The axial permanent magnetic suspension bearing rotor 3 and the radial electromagnetic bearing 2 are both installed in the axial permanent magnetic suspension bearing stator 1, the axial permanent magnetic bearing 5 is installed on the axial permanent magnetic suspension bearing rotor 3, the axial permanent magnetic suspension bearing rotor 3 is connected with the load 4, the axial permanent magnetic suspension bearing rotor 3 passes through the radial electromagnetic bearing 2 and the axial permanent magnetic bearing 5, the radial electromagnetic bearing 2 is located on both sides of the axial permanent magnetic bearing 5, and the axial suspension is realized by the relative movement between the plurality of annular permanent magnets of the axial permanent magnetic bearing 5.

[0032] In this embodiment, the axial permanent magnetic suspension bearing mainly includes an axial permanent magnetic suspension bearing stator 1, an axial permanent magnetic suspension bearing rotor 3, a load 4, an axial permanent magnetic bearing 5, and two radial electromagnetic bearings 2.

[0033] The axial permanent magnetic suspension bearing stator 1 is a hollow cylindrical structure, and a circular ring-shaped partition plate 6 is arranged at the middle position of the inside of the axial permanent magnetic suspension bearing stator 1, a circular hole is formed at the center of the circular ring-shaped partition plate 6, the circular hole is used for passing through the axial permanent magnetic suspension bearing rotor 3, and the circular ring-shaped partition plate 6 at the middle position of the inside of the axial permanent magnetic suspension bearing stator 1 is integrated with the hollow cylindrical structure shell of the axial permanent magnetic suspension bearing stator 1.

[0034] The radial electromagnetic bearing 2 comprises a radial electromagnetic bearing stator 21 and a radial electromagnetic bearing coil 22, the radial electromagnetic bearing stator 21 is connected with the axial permanent magnetic suspension bearing stator 1, the radial electromagnetic bearing coil 22 is installed on the radial electromagnetic bearing stator 21, and the radial electromagnetic bearing coil 22 is arranged at intervals with the axial permanent magnetic suspension bearing rotor 3 as the center.

[0035] In the embodiment, the radial electromagnetic bearing 2 is composed of the radial electromagnetic bearing stator 21 and the radial electromagnetic bearing coil 22, in the embodiment, two radial electromagnetic bearings 2 are arranged at the upper end and the lower end of the inside of the cylindrical hollow structure of the axial permanent magnetic suspension bearing stator 1, and are used for realizing the control of the radial suspension gap of the axial permanent magnetic suspension bearing rotor 3, in order to ensure the connection strength, the radial electromagnetic bearing 2 can be directly welded on the axial permanent magnetic suspension bearing stator 1, or can be fixed in the mode of bolt connection.

[0036] The axial permanent magnetic suspension bearing rotor 3 comprises a rotating shaft 31, a thrust disc 32 and a magnetic conducting ring 33, the rotating shaft 31 passes through the radial electromagnetic bearing 2 and the axial permanent magnetic bearing 5, the thrust disc 32 and the magnetic conducting ring 33 are both installed on the rotor 31, and the magnetic conducting ring 33 and the radial electromagnetic bearing 2 are in the same plane.

[0037] The axial permanent magnetic suspension bearing further comprises a partition plate 6, the partition plate 6 is installed on the axial permanent magnetic suspension bearing stator 1, and the partition plate 6 is located in the middle of the two radial electromagnetic bearings 2.

[0038] In the embodiment, the axial permanent magnetic suspension bearing rotor 3 is composed of the rotating shaft 31, the magnetic conducting ring 33 and the thrust disc 32, the magnetic conducting ring 33 is made of a magnetic conducting material with high magnetic conductivity, is a hollow circular ring structure, is sleeved on the rotating shaft 31 through welding or the like, and is in the same horizontal plane and has the same thickness as the radial electromagnetic bearing stator 22, the thrust disc 32 is a main object for bearing axial load of the axial permanent magnetic suspension bearing rotor 3, and the rotating shaft 31 and the thrust disc 32 are fixed in an integrated design or by welding.

[0039] The axial permanent magnetic bearing 5 comprises a second annular permanent magnet 52 and two groups of first annular permanent magnets 51, the second annular permanent magnet 52 is installed in the middle of the first annular permanent magnet 51, the first annular permanent magnet 51 is installed on the partition plate 6, and the second annular permanent magnet 52 is installed on the thrust disc 32.

[0040] The second annular permanent magnet 52 and the two groups of first annular permanent magnets 51 are in meshing contact.

[0041] The first annular permanent magnet 51 and the second annular permanent magnet 52 each comprise a plurality of layers of magnetic poles, and the plurality of layers of magnetic poles of the first annular permanent magnet 51 and the second annular permanent magnet 52 are arranged in different manners.

[0042] The axial permanent magnetic bearing 5 further comprises a partition plate installed in the middle of adjacent magnetic poles of the first annular permanent magnet 51 and the second annular permanent magnet 52.

[0043] The axial permanent magnetic bearing 5 further comprises an anti-suction cover installed on the first annular permanent magnet 51 and the second annular permanent magnet 52, and the anti-suction cover is connected with the partition plate 6 or the thrust disc 32, respectively.

[0044] In the embodiment, the axial permanent magnetic bearing 5 is designed based on a permanent magnetic array suspension structure, and in the embodiment, the axial permanent magnetic bearing 5 comprises a group of second annular permanent magnets 52 and two groups of first annular permanent magnets 51, and the first annular permanent magnets 51 and the second annular permanent magnets 52 are in meshing contact with each other; wherein the second annular permanent magnets 52 are fixed on the lower surface of the thrust disc 32, the two groups of first annular permanent magnets 51 are fixed on the upper surface of the circular partition plate 6 at the middle position of the inner side of the hollow cylindrical structure stator, and the two groups of first annular permanent magnets 51 are arranged at intervals with the second annular permanent magnets 52 as a partition.

[0045] Each group of second annular permanent magnets 52 and first annular permanent magnets 51 comprises a plurality of layers of radial magnetic poles, and in the embodiment, three layers are taken as an example; each layer of magnetic poles is divided into N and S polarities in the radial direction, the magnetic pole distribution of the two groups of first annular permanent magnets 51 is the same, and from bottom to top, it is NS, SN and NS, and the magnetic pole distribution of the second annular permanent magnet 52 is from bottom to top, it is SN, NS and SN, and the magnetic poles are divided into a first layer, a second layer and a third layer from bottom to top; the magnetization directions of adjacent layers of radial magnetic poles of each group of annular permanent magnets are opposite, and in the state of no axial load, the magnetization directions of the radial magnetic poles opposite to each other of the second annular permanent magnet 52 and the first annular permanent magnet 51 are the same. Figure 4 and Figure 5 As shown in the two radial magnetization modes of the annular permanent magnet in the axial permanent magnetic bearing.

[0046] Specifically, the magnetization directions of the adjacent layers of the three layers of radial magnetic poles of the second annular permanent magnet 52 and the first annular permanent magnet 51 are opposite; the first annular permanent magnet 51 includes two groups of annular permanent magnets each composed of three layers of radial magnetic poles, and the second annular permanent magnet 52 includes one group of annular permanent magnets each composed of three layers of radial magnetic poles; the magnetization directions of the same layer of radial magnetic poles of the different groups of first annular permanent magnets 51 are the same, and the magnetization directions of the three layers of radial magnetic poles of the second annular permanent magnet 52 are the same as those of the radial magnetic poles of the first annular permanent magnet 51 opposite to the second annular permanent magnet 52, that is, the first layer of radial magnetic poles of the second annular permanent magnet 52 is opposite to the second layer of radial magnetic poles of the first annular permanent magnet 51, and the magnetization directions of the first layer of radial magnetic poles of the second annular permanent magnet 52 and the second layer of radial magnetic poles of the first annular permanent magnet 51 are the same, the second layer of radial magnetic poles of the second annular permanent magnet 52 is opposite to the third layer of radial magnetic poles of the first annular permanent magnet 51, and the magnetization directions of the second layer of radial magnetic poles of the second annular permanent magnet 52 and the third layer of radial magnetic poles of the first annular permanent magnet 51 are the same, and the magnetization direction of the third layer of radial magnetic poles of the second annular permanent magnet 52 is opposite to that of the second layer of radial magnetic poles of the second annular permanent magnet 52.

[0047] The second annular permanent magnet 52 and the first annular permanent magnet 51 are each composed of three layers of radial magnetic poles, and the radial magnetic poles of the adjacent layers of each layer are separated by a separation plate made of epoxy resin.

[0048] A stainless steel cover is coated on the surface of the second annular permanent magnet 52 and fixed to the lower surface of the thrust disc 32, and a stainless steel cover is coated on the surface of the first annular permanent magnet 51 and fixed to the upper surface of the annular separation plate 6 at the middle position of the inner side of the axial magnetic suspension bearing stator 1; the stainless steel cover serves to fix the second annular permanent magnet 52 and the first annular permanent magnet 51 and prevent the second annular permanent magnet 52 and the first annular permanent magnet 51 from being directly attracted.

[0049] The suspension principle of the axial magnetic bearing 5 is as follows:

[0050] A second annular permanent magnet 52 composed of three layers of radial magnetic poles is arranged on the lower surface of the thrust disc 32, and two groups of first annular permanent magnets 51 each composed of three layers of radial magnetic poles are arranged on the upper surface of the annular separation plate 6 at the middle position of the inner side of the axial magnetic suspension bearing stator 1; the second annular permanent magnet 52 and the first annular permanent magnet 51 each adopt a magnetic suspension array structure, the second annular permanent magnet 52 and the first annular permanent magnet 51 are interlaced with each other but are separated from each other without contact, the magnetic lines of force between the second annular permanent magnet 52 and the first annular permanent magnet 51 pass through the second annular permanent magnet 52 and the first annular permanent magnet 51 transversely and are interwoven and engaged according to the principle of the shortest magnetic force line, the magnetic properties of the adjacent second annular permanent magnet 52 and the first annular permanent magnet 51 at the same horizontal height are opposite, and when the magnetic suspension bearing is subjected to an axial load and displaced in the vertical direction, the second annular permanent magnet 52 and the first annular permanent magnet 51 can generate a vertical suspension force, thereby inhibiting the axial displacement.

[0051] In the present embodiment, the generation process of the axial permanent magnetic suspension force is as follows:

[0052] When the rotating shaft 31 of the magnetic suspension bearing is subjected to a vertical downward load, the axial permanent magnetic suspension bearing rotor 3 generates a vertical downward displacement, and the second annular permanent magnet 52 fixed to the lower surface of the thrust disc 32 also generates a vertical downward displacement. At this time, the first layer of radial magnetic poles of the two sets of first annular permanent magnets 51 and the first layer of radial magnetic poles of the second annular permanent magnet 52 generate a magnetic repulsion force with a vertical upward direction of the resultant force; the second layer of radial magnetic poles of the two sets of first annular permanent magnets 51 and the first layer of radial magnetic poles of the second annular permanent magnet 52 generate a magnetic attraction force with a vertical upward direction of the resultant force; the second layer of radial magnetic poles of the two sets of first annular permanent magnets 51 and the second layer of radial magnetic poles of the second annular permanent magnet 52 generate a magnetic repulsion force with a vertical upward direction of the resultant force; the third layer of radial magnetic poles of the two sets of first annular permanent magnets 51 and the second layer of radial magnetic poles of the second annular permanent magnet 52 generate a magnetic attraction force with a vertical upward direction of the resultant force; and the third layer of radial magnetic poles of the two sets of first annular permanent magnets 51 and the third layer of radial magnetic poles of the second annular permanent magnet 52 generate a magnetic repulsion force with a vertical upward direction of the resultant force.

[0053] Similarly, when the rotating shaft 31 of the magnetic suspension bearing is subjected to a vertical upward load, the axial permanent magnetic suspension bearing rotor 3 generates a vertical upward displacement, and the second annular permanent magnet 52 fixed to the lower surface of the thrust disc 32 also generates a vertical upward displacement. At this time, the second layer of radial magnetic poles of the two sets of first annular permanent magnets 51 and the first layer of radial magnetic poles of the second annular permanent magnet 52 generate a magnetic attraction force with a vertical downward direction of the resultant force; the third layer of radial magnetic poles of the two sets of first annular permanent magnets 51 and the first layer of radial magnetic poles of the second annular permanent magnet 52 generate a magnetic repulsion force with a vertical downward direction of the resultant force; and the third layer of radial magnetic poles of the two sets of first annular permanent magnets 51 and the second layer of radial magnetic poles of the second annular permanent magnet 52 generate a magnetic attraction force with a vertical downward direction of the resultant force.

[0054] Therefore, the axial permanent magnetic bearing 5 has a bidirectional bearing capacity, which can not only bear axial pressure but also axial tension.

[0055] The permanent magnets in the axial permanent magnetic bearing 5 adopt a permanent magnetic suspension array structure, which is interwoven and engaged between the second annular permanent magnet 52 and the first annular permanent magnet 51 according to the shortest magnetic force line principle, thereby restricting the axial displacement of the magnetic suspension bearing. The structure has the characteristics of high utilization rate of permanent magnets, less magnetic leakage, and strong bearing capacity. Compared with the traditional axial permanent magnetic bearing relying on magnetic repulsion, the axial permanent magnetic bearing 5 has the advantages of high float-to-weight ratio and bidirectional bearing capacity.

[0056] In addition, the load 4 is also included, the axial permanent magnetic bearing 5 based on the permanent magnetic array suspension structure provided by the embodiment has the advantage of large floating weight ratio, and the radial electromagnetic bearing 2 can ensure that the magnetic suspension bearing has no mechanical wear, so the load 4 in the embodiment can be a magnetic suspension fan load, a magnetic suspension compressor load and the like with high speed requirement, or an aero turbine engine load, a flywheel energy storage load and the like with high floating weight ratio requirement.

[0057] Embodiment 2

[0058] A control system for an axial permanent magnetic suspension bearing based on electromagnetic suspension, the control system comprising a suspension controller, a displacement sensor and a current sensor, the suspension controller, the displacement sensor and the current sensor are all connected with the axial permanent magnetic suspension bearing, and the suspension controller is used for radial position control of the axial permanent magnetic suspension bearing.

[0059] In the embodiment, the suspension controller, the displacement sensor and the current sensor are arranged to ensure that the radial electromagnetic bearing 2 can realize the radial position control of the magnetic suspension bearing, and the axial permanent magnetic bearing 5 can work at the optimal suspension position; the suspension controller is used to realize the control process.

[0060] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An axial permanent magnet levitation bearing based on electromagnetic levitation, characterized in that, The system includes an axial permanent magnet levitation bearing stator (1), an axial permanent magnet levitation bearing rotor (3), a load (4), an axial permanent magnet bearing (5), and two radial electromagnetic bearings (2). The axial permanent magnet levitation bearing rotor (3) and the radial electromagnetic bearings (2) are both installed in the axial permanent magnet levitation bearing stator (1). The axial permanent magnet bearing (5) is installed on the axial permanent magnet levitation bearing rotor (3). The axial permanent magnet levitation bearing rotor (3) is connected to the load (4). The axial permanent magnet levitation bearing rotor (3) passes through the radial electromagnetic bearings (2) and the axial permanent magnet bearings (5). The radial electromagnetic bearings (2) are located on both sides of the axial permanent magnet bearings (5). Axial levitation is achieved by the relative movement between multiple annular permanent magnets of the axial permanent magnet bearings (5).

2. The axial permanent magnet levitation bearing based on electromagnetic levitation according to claim 1, characterized in that, The radial electromagnetic bearing (2) includes a radial electromagnetic bearing stator (21) and a radial electromagnetic bearing coil (22). The radial electromagnetic bearing stator (21) is connected to the axial permanent magnet levitation bearing stator (1). The radial electromagnetic bearing coil (22) is mounted on the radial electromagnetic bearing stator (21) and the radial electromagnetic bearing coil (22) is spaced apart with the axial permanent magnet levitation bearing rotor (3) as the center.

3. An axial permanent magnet levitation bearing based on electromagnetic levitation according to claim 2, characterized in that, The axial permanent magnet suspension bearing rotor (3) includes a rotating shaft (31), a thrust disk (32), and a magnetic ring (33). The rotating shaft (31) passes through the radial electromagnetic bearing (2) and the axial permanent magnet bearing (5). The thrust disk (32) and the magnetic ring (33) are both mounted on the rotor (31). The magnetic ring (33) and the radial electromagnetic bearing (2) are on the same plane.

4. An axial permanent magnet levitation bearing based on electromagnetic levitation according to claim 3, characterized in that, The axial permanent magnet levitation bearing also includes a partition (6), which is mounted on the stator (1) of the axial permanent magnet levitation bearing and is located between two radial electromagnetic bearings (2).

5. An axial permanent magnet levitation bearing based on electromagnetic levitation according to claim 4, characterized in that, The axial permanent magnet bearing (5) includes a second annular permanent magnet (52) and two sets of first annular permanent magnets (51). The second annular permanent magnet (52) is installed in the middle of the first annular permanent magnets (51). The first annular permanent magnets (51) are installed on the partition plate (6). The second annular permanent magnet (52) is installed on the thrust plate (32).

6. An axial permanent magnet levitation bearing based on electromagnetic levitation according to claim 5, characterized in that, There is no contact engagement between the second annular permanent magnet (52) and the two sets of first annular permanent magnets (51).

7. An axial permanent magnet levitation bearing based on electromagnetic levitation according to claim 5, characterized in that, Both the first annular permanent magnet (51) and the second annular permanent magnet (52) include multiple magnetic poles, but the arrangement of the multiple magnetic poles of the first annular permanent magnet (51) and the second annular permanent magnet (52) is different.

8. An axial permanent magnet levitation bearing based on electromagnetic levitation according to claim 7, characterized in that, The axial permanent magnet bearing (5) also includes a partition plate, which is installed between the adjacent magnetic poles of the first annular permanent magnet (51) and the second annular permanent magnet (52).

9. An axial permanent magnet levitation bearing based on electromagnetic levitation according to claim 7, characterized in that, The axial permanent magnet bearing (5) also includes an anti-sucking cover, which is installed on the first annular permanent magnet (51) and the second annular permanent magnet (52), and the anti-sucking cover is connected to the partition (6) or the thrust plate (32) respectively.

10. A control system for an axial permanent magnet levitation bearing based on electromagnetic levitation as described in any one of claims 1-9, characterized in that, The control system includes a suspension controller, a displacement sensor, and a current sensor. The suspension controller, displacement sensor, and current sensor are all connected to the axial permanent magnet suspension bearing. The suspension controller is used for radial position control of the axial permanent magnet suspension bearing.

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