Embedded magnetic suspension-air flotation hybrid bearing

Abstract

The utility model provides an embedded magnetic suspension-air flotation hybrid bearing, and belongs to the field of bearings. The problems that an existing embedded magnetic-gas hybrid bearing is complex in machining process, and an air bearing part is poor in reusability and difficult to repair are solved. Comprising an inner supporting structure and an outer supporting structure which are embedded into the two sides of the magnetic-gas hybrid bearing seat, an outer supporting tooth-shaped table of the outer supporting structure is inserted between stator magnetic poles of the magnetic suspension bearing and spliced with an inner supporting tooth-shaped table of the inner supporting structure to form a complete cylindrical surface, and a corrugated foil wraps a top foil and is arranged in the spliced cylindrical surface. According to the utility model, the direct contact between the journal and the magnetic pole can be avoided, and the working rotating speed range and adaptive load of the magnetic suspension bearing and the air bearing are expanded; a protective bearing of the magnetic suspension bearing is replaced by the air bearing, so that the axial length of the rotor is reduced, and the shafting stability is improved; and installation and maintenance are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings, in particular to an embedded magnetic suspension-air floating hybrid bearing. Background Art

[0002] As core components of rotating machinery, bearings play a vital role in the performance and reliability of mechanical systems. Magnetic bearings are mechatronic products that utilize electromagnetic force to suspend a rotor in a reference position. Due to their lack of mechanical contact and ability to achieve active control, they are widely used in important fields such as flywheel energy storage, high-speed spindles, turbine machinery, and satellites. Hydrodynamic foil air bearings are self-acting hydrodynamic gas bearings with flexible support surfaces. They also require no lubrication, are pollution-free, and offer high rotational accuracy. They also exhibit excellent adaptability, reduce bearing manufacturing accuracy, and reduce rotor alignment. They also offer low maintenance costs and minimal power consumption.

[0003] In recent years, as the application and development of gas bearings and magnetic bearings in high-end equipment have matured, their shortcomings in rotating machinery have become increasingly prominent. Magnetic bearings are suitable for heavy-load and high-speed conditions, but they suffer from poor reliability and high energy consumption due to limited bearing life and high power consumption. Gas foil bearings are suitable for high-speed and light-load conditions, but they experience significant wear during start-up and shutdown, and have relatively low load capacity and stiffness at low speeds.

[0004] Because the operating speed ranges and application scenarios of magnetic and air bearings partially overlap, and they can complement each other's shortcomings, the magnetic hybrid bearing combines the advantages of both. While maintaining the excellent performance of the air bearing, such as high speed and strong tolerance to temperature rise, it also addresses the issues of friction between the shaft neck and the bearing surface and low load-bearing capacity at low speeds. The magnetic bearing's protective bearing is eliminated, simplifying the system structure. Furthermore, the system's stiffness and damping can be adjusted by adjusting control parameters, improving rotor stability at high speeds.

[0005] Currently, a common type of magnetic hybrid bearing is the embedded magnetic hybrid bearing. This refers to a bearing in which a magnetic bearing and an air bearing provide support at the same axial position in the shaft system. Existing technical solutions typically utilize the air gap and slot space within the magnetic bearing to form the inner surface of the fixed foil structure, using methods such as resin filling or direct machining of the inner surface of the magnetic poles. However, these methods are complex to manufacture, and the air bearing portion has poor reusability and is difficult to repair. Utility Model Content

[0006] The technical problems to be solved by the utility model are:

[0007] In order to solve the problems of complex processing technology of existing embedded magnetic hybrid bearings, poor reusability of air bearing parts and difficulty in repair.

[0008] The utility model adopts the following technical solutions to solve the above technical problems:

[0009] The utility model provides an embedded magnetic suspension-air floating hybrid bearing, comprising an air floating bearing retaining ring, an outer support structure, a corrugated foil, a top foil, a magnetic suspension bearing stator, a magnetic hybrid bearing seat, a stator coil and an inner support structure.

[0010] The magnetic hybrid bearing seat includes a hybrid bearing seat flange with a neck, circular grooves are respectively opened on both sides of the neck, the outer support structure and the inner support structure are respectively detachably fixed in the circular grooves on both sides, and a stator axial limiting boss is provided on the inner wall of the neck. The magnetic suspension bearing stator is arranged in the neck and its movement is limited by the stator axial limiting boss. The magnetic suspension bearing stator includes a plurality of circumferentially evenly distributed stator poles pointing to the central axis of the shaft system, the ends of the stator poles are pole bosses, and a stator coil is wound around each stator pole;

[0011] The outer support structure includes an outer support flange, a circular groove is formed on one side of the neck of the outer support flange, and the air bearing retaining ring is detachably arranged in the circular groove to limit the axial displacement of the corrugated foil and the top foil. A plurality of spaced and evenly distributed outer support tooth-shaped platforms are provided on the other side of the outer support flange where the circular groove is formed, and the plurality of outer support tooth-shaped platforms are surrounded to form a circular tubular structure.

[0012] The inner support structure includes an inner support flange, a circular inner support stop is provided on one side of the neck of the inner support flange, a plurality of inner support tooth-shaped platforms are provided on the inner wall of the inner support stop, and the plurality of inner support tooth-shaped platforms are arranged at intervals and evenly distributed, and the plurality of inner support tooth-shaped platforms are surrounded to form a circular tubular structure, the axial length of the inner support tooth-shaped platform is greater than the length of the inner support stop, and the inner support tooth-shaped platform is used to be inserted into the gap between the outer support tooth-shaped platforms;

[0013] The outer support toothed platform of the outer support structure extends into the cylindrical space at the center of the magnetic bearing stator, and the end of the outer support toothed platform is staggered and spliced ​​with the inner support toothed platform of the inner support structure extending into the cylindrical space at the center of the magnetic bearing stator. The magnetic pole boss is arranged in the space enclosed by the outer support toothed platform and the inner support toothed platform. The outer support toothed platform, the inner support toothed platform and the magnetic pole boss together form a complete cylindrical surface.

[0014] The top foil is arranged in a complete cylindrical surface formed by the outer supporting toothed platform, the inner supporting toothed platform and the magnetic pole boss, and its cross section is a concentric circle. Multiple corrugated foils are arranged between the top foil and the complete cylindrical surface formed by the outer supporting toothed platform, the inner supporting toothed platform and the magnetic pole boss.

[0015] Furthermore, a baffle is provided on one side of the corrugated foil, and a top foil fixing dovetail is provided on the inner wall of the outer supporting toothed platform along the extension direction of the outer supporting toothed platform, and the interface of the top foil is clamped between the top foil fixing dovetail and the outer supporting toothed platform.

[0016] Furthermore, the top foil is a whole rectangular plate structure bent into a cylindrical structure, the outer support toothed platform is provided with a corrugated foil fixing groove arranged along the extension direction of the outer support toothed platform, and the baffle of the corrugated foil is clamped in the corrugated foil fixing groove.

[0017] Furthermore, the number of the stator poles is 3, 4, 8 or 16.

[0018] Furthermore, the number of the corrugated foil is at least one, and the arch height of the corrugated foil is the difference between the inner diameter of the complete cylindrical surface formed by the outer supporting toothed platform, the inner supporting toothed platform and the magnetic pole boss and the outer diameter of the top foil.

[0019] Furthermore, the inner surface of the top foil is provided with a wear-resistant coating, and the difference between the inner diameter of the top foil and the outer diameter of the rotor is the initial air gap thickness.

[0020] Furthermore, the number of the outer supporting tooth profiles, the number of the inner supporting tooth profiles and the number of the stator poles are the same.

[0021] Furthermore, the inner diameter of the stator axial limiting boss is smaller than the outer diameter of the magnetic bearing stator.

[0022] Furthermore, the outer supporting flange is provided with wire outlet holes, the number of which is the same as or greater than the number of the stator magnetic poles, for extending the copper wires of the stator coil out of the wire outlet holes.

[0023] Furthermore, the outer supporting structure is a non-magnetic outer supporting structure, the inner supporting structure is a non-magnetic inner supporting structure, and the top foil is a non-magnetic top foil.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1) The bearing's load capacity and operating range are improved, reducing the bearing's power consumption during continuous operation. At the rotor's operating speed, the rotor can be supported by both the magnetic bearing and the air bearing, significantly improving the bearing capacity compared to air foil bearings of the same size. The operating range covers the full speed and load range applicable to both magnetic bearings and air bearings. When the air bearing bears the primary load, the magnetic bearing's energy consumption is reduced, minimizing the likelihood of coil temperature rise.

[0026] 2) The structure is compact and simple, easy to install and maintain. The internal and external support structures are fixed with flanges that are easy to install and disassemble. The space in the magnetic pole slots of the magnetic bearing stator forms a support structure for the foil structure. Compared with methods using resin filling or direct processing, this device can reduce the impact of the air bearing structure on the air gap of the magnetic bearing during the embedding process, making the embedding more reasonable. The processing technology is simple, and the air bearing structure is easy to repair and replace.

[0027] 3) The protective bearing, which was used to prevent the rotor from falling due to sudden failure of the magnetic bearing, is eliminated, simplifying the system structure. Since the foil structure can withstand a certain degree of impact load, it protects the bearing and prevents direct contact between the rotor journal and the magnetic poles of the magnetic bearing during rotation. This eliminates the rotor length used for the protective bearing in the shaft system, effectively increasing the critical speed of the rotor.

[0028] 4) This device supports online monitoring of the rotor shaft status data. The rotor data measured during the magnetic bearing control process is output to the computer to monitor the rotor operating status, which can improve the reliability of the system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is an exploded view of an embedded magnetic suspension-air floating hybrid bearing in an embodiment of the present utility model;

[0030] Figure 2 This is an assembly diagram of an embedded magnetic suspension-air floating hybrid bearing in an embodiment of the present utility model;

[0031] Figure 3 This is a cross-sectional view of an embedded magnetic suspension-air floating hybrid bearing in an embodiment of the present utility model;

[0032] Figure 4 Schematic diagram of the internal and external support structures in an embodiment of the present utility model;

[0033] Figure 5 This is a schematic diagram of the internal support structure in an embodiment of the present utility model;

[0034] Figure 6 This is an axial cross-sectional view of the air bearing in the embodiment of the present utility model;

[0035] Figure 7 Schematic diagram of the structure of the air bearing foil in the embodiment of the present utility model, wherein (a) is the top foil and (b) is the corrugated foil.

[0036] Description of reference numerals:

[0037] 1. Air bearing retaining ring; 2. External support structure; 3. Corrugated foil; 4. Top foil; 5. Magnetic suspension bearing stator; 6. Magnetic hybrid bearing seat; 7. Stator coil; 8. Internal support structure; 9. Axial direction; 1a. Retaining ring fixing threaded hole 1; 2a. External support fixing threaded hole; 2b. Wire outlet hole; 2c. Corrugated foil fixing groove; 2d. Top foil fixing dovetail; 2e. Retaining ring fixing threaded hole 2; 2f. External support toothed platform; 2g. External support flange; 5a. Stator fixing groove; 5b. Stator pole; 5c. Pole boss; 6a. Hybrid bearing mounting hole; 6b. Hybrid bearing circumferential mounting hole; 6c. Stator axial limit boss; 6d. Hybrid bearing seat flange; 8a. Internal support stop; 8b. Internal support fixing threaded hole; 8c. Internal support toothed platform; 8d. Internal support flange. DETAILED DESCRIPTION

[0038] In the description of the present invention, it should be noted that the terms and nouns in each embodiment, such as "up", "down", "front", "back", "left", "right", etc., which indicate directions, are only for simplifying the description of the positional relationship based on the drawings in the specification, and do not mean that the referred elements and devices must be operated in accordance with the specific directions and defined operations and methods and structures in the specification. Such direction nouns do not constitute a limitation on the present invention.

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0040] Specific implementation plan 1: Combined Figures 1 to 7 As shown, the utility model provides an embedded magnetic suspension-air floating hybrid bearing, including an air floating bearing retaining ring 1, an outer support structure 2, a corrugated foil 3, a top foil 4, a magnetic suspension bearing stator 5, a magnetic hybrid bearing seat 6, a stator coil 7 and an inner support structure 8.

[0041] The magnetic hybrid bearing seat 6 includes a hybrid bearing seat flange 6d with a neck, and circular grooves are respectively opened on both sides of the neck. The outer support structure 2 and the inner support structure 8 are respectively fixed in the circular grooves on both sides. Figure 2As shown, the outer support structure 2 and the inner support structure 8 are both embedded in the end of the hybrid bearing seat flange 6d. This form of arrangement forms an embedded magnetic hybrid structure, reduces the axial length of the rotor, and facilitates the design of the rotor shaft system; a stator axial limiting boss 6c is provided on the inner wall of the neck of the hybrid bearing seat flange 6d, and the magnetic suspension bearing stator 5 is arranged in the neck and is limited by the stator axial limiting boss 6c to move in the direction opposite to the direction of the arrow in the axial direction 9. The magnetic suspension bearing stator 5 includes a plurality of circumferentially evenly distributed stator poles 5b pointing to the central axis of the shaft system, and the end of the stator pole 5b is a pole boss 5c, and each stator pole 5b is wound with a stator coil 7;

[0042] The outer support structure 2 includes an outer support flange 2g, a circular groove is formed on one side of the neck of the outer support flange 2g, and the air bearing retaining ring 1 is detachably arranged in the circular groove to limit the axial displacement of the corrugated foil 3 and the top foil 4. Figure 2 As shown, the air bearing retaining ring 1 is embedded in the end of the outer support flange 2g, and the other side of the outer support flange 2g with a circular groove is provided with a plurality of spaced and evenly distributed outer support toothed stages 2f, and the plurality of outer support toothed stages 2f are surrounded to form a circular tubular structure;

[0043] The inner support structure 8 includes an inner support flange 8d, a circular inner support stop 8a is provided on one side of the neck of the inner support flange 8d, and a plurality of inner support tooth-shaped platforms 8c are provided on the inner wall of the inner support stop 8a. The plurality of inner support tooth-shaped platforms 8c are arranged at intervals and evenly distributed, and the plurality of inner support tooth-shaped platforms 8c are surrounded to form a circular tubular structure. The circular tubular structure formed by the plurality of outer support tooth-shaped platforms 2f has the same inner diameter as the circular tubular structure formed by the plurality of inner support tooth-shaped platforms 8c.

[0044] The outer support toothed platform 2f of the outer support structure 2 extends into the cylindrical space at the center of the magnetic bearing stator 5. The end of the outer support toothed platform 2f is staggered and spliced ​​with the inner support toothed platform 8c of the inner support structure 8 extending into the cylindrical space at the center of the magnetic bearing stator 5. The magnetic pole boss 5c is arranged in the space enclosed by the outer support toothed platform 2f and the inner support toothed platform 8c. The outer support toothed platform 2f, the inner support toothed platform 8c and the magnetic pole boss 5c together form a complete cylindrical surface for providing support for the corrugated foil 3 and the top foil 4 of the air bearing;

[0045] The top foil 4 is arranged in a complete cylindrical surface formed by the outer support toothed platform 2f, the inner support toothed platform 8c and the magnetic pole boss 5c, and its cross section is a concentric circle. Multiple corrugated foils 3 are arranged between the top foil 4 and the complete cylindrical surface formed by the outer support toothed platform 2f, the inner support toothed platform 8c and the magnetic pole boss 5c.

[0046] Combine Figure 7As shown in (b), a baffle is provided on one side of the corrugated foil 3, combined with Figure 7 As shown in (a), the top foil 4 is a whole rectangular plate structure bent into a cylindrical structure; a top foil fixing dovetail 2d is provided on the inner wall of an outer support toothed platform 2f along the extension direction of the outer support toothed platform 2f. During installation, the interface of the top foil 4 is clamped between the top foil fixing dovetail 2d and the outer support toothed platform 2f; the outer support toothed platform 2f is provided with a corrugated foil fixing groove 2c arranged along the extension direction of the outer support toothed platform 2f, and the baffle of the corrugated foil 3 is clamped in the corrugated foil fixing groove 2c. During installation, insert the outer support toothed stage 2f into the space of the stator pole 5b slot in the opposite direction of the arrow in the axial direction 9. After the circumferential position of the outer support fixing threaded hole 2a is adjusted to match the inner threaded hole in the circular groove of the magnetic hybrid bearing seat 6, the copper wire of the stator coil 7 is led out through the outlet hole 2b on the outer support flange 2g. The number of the outlet holes 2b is determined according to the number of the stator poles 5b of the magnetic levitation bearing. Finally, use the hexagon socket screw to screw into the outer support fixing threaded hole 2a to fix the outer support structure 2; insert the inner support toothed stage 8c into the gap of the outer support toothed stage 2f in the axial direction 9, and use the hexagon socket screw to screw into the inner support fixing threaded hole 8b to fix the inner support structure 8.

[0047] The axial length of the inner support tooth profile platform 8c is greater than the length of the inner support stop 8a, and the inner support tooth profile platform 8c can be inserted into the gap between the outer support tooth profile platforms 2f.

[0048] The inner diameter of the stator axial limiting boss 6c is smaller than the outer diameter of the magnetic bearing stator 5; the neck of the magnetic hybrid bearing seat 6 is circumferentially provided with a hybrid bearing circumferential mounting hole 6b, and the outer wall of the magnetic bearing stator 5 is circumferentially provided with a stator fixing groove 5a. The number and position of the hybrid bearing circumferential mounting holes 6b are the same as the position and number of the stator fixing grooves 5a. The magnetic bearing stator 5 is fixed in the magnetic hybrid bearing seat 6 by bolts. During installation, the magnetic bearing stator 5 is rotated axially so that the position of the stator fixing groove 5a is the same as the position of the hybrid bearing circumferential mounting holes 6b. The magnetic bearing stator 5 is placed into the magnetic hybrid bearing seat 6 by shrink fitting until the magnetic bearing stator 5 contacts the stator axial positioning boss 6c. This fixes the position of the magnetic bearing stator 5 in the axial direction, and screws the hexagon socket screws into the hybrid bearing circumferential mounting holes 6b to lock the circumferential position of the magnetic bearing stator 5.

[0049] The hybrid bearing seat flange 6d is provided with a plurality of hybrid bearing mounting holes 6a, which are used to fix the magnetic hybrid bearing to other mechanical components of the rotating mechanical system through the hybrid bearing mounting holes 6a.

[0050] The magnetic bearing stator 5 is made of laminated silicon steel sheets, which can reduce the hysteresis loss and eddy current loss of the magnetic bearing; the number of the stator poles 5b can be 3, 4, 8 or 16, and can also be increased or decreased according to actual conditions.

[0051] The number of the corrugated foil 3 is at least one, and the arch height of the corrugated foil 3 is the difference between the inner diameter of the complete cylindrical surface formed by the outer supporting toothed platform 2f, the inner supporting toothed platform 8c and the magnetic pole boss 5c and the outer diameter of the top foil 4.

[0052] The top foil 4 is made of non-magnetic material, and the inner surface of the top foil 4 is sprayed with a wear-resistant coating. The difference between the inner diameter of the top foil 4 and the outer diameter of the rotor is the initial air gap thickness.

[0053] The outer support structure 2 and the inner support structure 8 are both made of aluminum alloy, ceramic or other non-magnetic conductive materials.

[0054] The number of the outer supporting tooth profile stages 2f, the number of the inner supporting tooth profile stages 8c and the number of the stator poles 5b are the same.

[0055] The outer support flange 2g is provided with a plurality of outer support fixing threaded holes 2a, and the outer support structure 2 is fixed to the magnetic hybrid bearing seat 6 by bolts; the outer support flange 2g is provided with a number of outlet holes 2b that is the same as or greater than the number of stator poles 5b, which are used to extend the copper wire of the stator coil 7 out of the outlet holes 2b; the inner support flange 8d is provided with a plurality of inner support fixing threaded holes 8b, and the inner support structure 8 is fixed to the magnetic hybrid bearing seat 6 by bolts.

[0056] The air bearing retaining ring 1 is provided with a plurality of retaining ring fixing threaded holes 1a, and the circular groove of the outer support structure 2 is provided with a plurality of retaining ring fixing threaded holes 2e corresponding to the retaining ring fixing threaded holes 1a. The air bearing retaining ring 1 is fixed to the outer support flange 2g by bolts.

[0057] Working principle:

[0058] At low speeds, including during startup and shutdown, the rotor shafting system does not experience aerodynamic pressure effects, and the magnetic bearings bear the entire load, preventing mechanical friction between the shaft journal and the top foil surface. Above the takeoff speed of the air bearing, the load distribution between the two support methods is dynamically adjusted based on the rotor speed by adjusting the magnetic hybrid bearing control parameters. At high speeds, the air bearings can bear the majority or even the entire load, while the magnetic bearings play a supporting role, reducing rotor vibration amplitude and improving operational stability.

[0059] Although the disclosure of the present invention is as above, the scope of protection of the present invention is not limited thereto. Those skilled in the art of the present invention may make various changes and modifications without departing from the spirit and scope of the present invention, and such changes and modifications shall fall within the scope of protection of the present invention.

Claims

1. An embedded magnetic suspension-air floating hybrid bearing, characterized by: It comprises an air bearing retaining ring (1), an outer supporting structure (2), a corrugated foil (3), a top foil (4), a magnetic suspension bearing stator (5), a magnetic hybrid bearing seat (6), a stator coil (7) and an inner supporting structure (8). The magnetic hybrid bearing seat (6) includes a hybrid bearing seat flange (6d) with a neck, circular grooves are respectively provided on both sides of the neck, the outer support structure (2) and the inner support structure (8) are respectively detachably fixed in the circular grooves on both sides, a stator axial limiting boss (6c) is provided on the inner wall of the neck, the magnetic suspension bearing stator (5) is arranged in the neck and its movement is limited by the stator axial limiting boss (6c), the magnetic suspension bearing stator (5) includes a plurality of circumferentially evenly distributed stator poles (5b) pointing to the central axis of the shaft system, the end of the stator pole (5b) is a pole boss (5c), and each stator pole (5b) is wound with a stator coil (7); The outer support structure (2) includes an outer support flange (2g), a circular groove is provided on one side of the neck of the outer support flange (2g), the air bearing retaining ring (1) is detachably arranged in the circular groove, and is used to limit the axial displacement of the corrugated foil (3) and the top foil (4), and a plurality of spaced and evenly distributed outer support tooth-shaped platforms (2f) are provided on the other side of the outer support flange (2g) where the circular groove is provided, and the plurality of outer support tooth-shaped platforms (2f) are surrounded to form a circular tubular structure; The inner support structure (8) includes an inner support flange (8d), a circular inner support stop (8a) is provided on one side of the neck of the inner support flange (8d), a plurality of inner support tooth-shaped platforms (8c) are provided on the inner wall of the inner support stop (8a), the plurality of inner support tooth-shaped platforms (8c) are arranged at intervals and evenly distributed, and the plurality of inner support tooth-shaped platforms (8c) are arranged around to form a circular tubular structure, the axial length of the inner support tooth-shaped platforms (8c) is greater than the length of the inner support stop (8a), and the inner support tooth-shaped platforms (8c) are used to be inserted into the gap between the outer support tooth-shaped platforms (2f); The outer supporting toothed platform (2f) of the outer supporting structure (2) extends into the cylindrical space at the center of the magnetic suspension bearing stator (5); the end of the outer supporting toothed platform (2f) is staggered and spliced ​​with the inner supporting toothed platform (8c) of the inner supporting structure (8) extending into the cylindrical space at the center of the magnetic suspension bearing stator (5); the magnetic pole boss (5c) is arranged in the space enclosed by the outer supporting toothed platform (2f) and the inner supporting toothed platform (8c); the outer supporting toothed platform (2f), the inner supporting toothed platform and the magnetic pole boss (5c) together form a complete cylindrical surface; The top foil (4) is arranged in a complete cylindrical surface formed by the outer supporting toothed platform (2f), the inner supporting toothed platform (8c) and the magnetic pole boss (5c), and the cross section is a concentric circle; a plurality of corrugated foils (3) are arranged between the top foil (4), the outer supporting toothed platform (2f), the inner supporting toothed platform (8c) and the magnetic pole boss (5c).

2. The embedded magnetic suspension-air floating hybrid bearing according to claim 1, characterized in that: A baffle is provided on one side of the corrugated foil (3); a top foil fixing dovetail (2d) is provided on the inner wall of the outer supporting toothed platform (2f) along the extension direction of the outer supporting toothed platform (2f); and the interface of the top foil (4) is clamped between the top foil fixing dovetail (2d) and the outer supporting toothed platform (2f).

3. The embedded magnetic suspension-air floating hybrid bearing according to claim 2, characterized in that: The top foil (4) is a whole rectangular plate structure bent into a cylindrical structure; the outer supporting toothed platform (2f) is provided with a corrugated foil fixing groove (2c) arranged along the extension direction of the outer supporting toothed platform (2f); the baffle of the corrugated foil (3) is clamped in the corrugated foil fixing groove (2c).

4. The embedded magnetic suspension-air floating hybrid bearing according to claim 3, characterized in that: The number of the stator poles (5b) is 3, 4, 8 or 16.

5. The embedded magnetic suspension-air floating hybrid bearing according to claim 3, characterized in that: The number of the corrugated foil (3) is at least one, and the arch height of the corrugated foil (3) is the difference between the inner diameter of the complete cylindrical surface formed by the outer supporting toothed platform (2f), the inner supporting toothed platform (8c) and the magnetic pole boss (5c) and the outer diameter of the top foil (4).

6. The embedded magnetic suspension-air floating hybrid bearing according to claim 5, characterized in that: The inner surface of the top foil (4) is provided with a wear-resistant coating, and the difference between the inner diameter of the top foil (4) and the outer diameter of the rotor is the initial air gap thickness.

7. The embedded magnetic suspension-air floating hybrid bearing according to claim 6, characterized in that: The number of the outer supporting tooth profile platforms (2f), the number of the inner supporting tooth profile platforms (8c) and the number of the stator magnetic poles (5b) are the same.

8. The embedded magnetic suspension-air floating hybrid bearing according to claim 7, characterized in that: The inner diameter of the stator axial limiting boss (6c) is smaller than the outer diameter of the magnetic suspension bearing stator (5).

9. The embedded magnetic suspension-air floating hybrid bearing according to claim 8, characterized in that: The outer supporting flange (2g) is provided with wire outlet holes (2b) whose number is the same as or greater than the number of stator magnetic poles (5b) and is used to extend the copper wire of the stator coil (7) out of the wire outlet holes (2b).

10. The embedded magnetic suspension-air floating hybrid bearing according to claim 9, characterized in that: The outer support structure (2) is a non-magnetic outer support structure, the inner support structure (8) is a non-magnetic inner support structure, and the top foil (4) is a non-magnetic top foil.

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