Embedded magnetic-gas hybrid bearing

Abstract

The invention provides an embedded magnetic-gas 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. The shaft neck can be prevented from being in direct contact with the magnetic pole, and the working rotating speed range and the 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 present invention relates to the technical field of bearings, and in particular to an embedded magnetic hybrid bearing. Background Art

[0002] As the core component of rotating machinery, bearings play a vital role in the performance and reliability of mechanical systems. Magnetic bearings are mechatronic products that use electromagnetic force to suspend the rotor in a reference position. Due to their non-mechanical contact and active control characteristics, they are widely used in important fields such as flywheel energy storage, high-speed spindles, turbine machinery, and artificial satellites. Hydrodynamic foil air bearings are self-acting hydrodynamic gas bearings with flexible support surfaces. They also have the characteristics of no lubrication, no pollution, high rotation accuracy, good adaptability, and reduced bearing manufacturing accuracy and rotor alignment; low maintenance costs and low power consumption.

[0003] In recent years, as the application and development of gas bearings and magnetic bearings in high-end equipment mature, the shortcomings of both in rotating machinery have become increasingly prominent. Magnetic bearings are suitable for heavy load and high speed conditions, but due to the limitation of bearing life protection and high power consumption, magnetic bearings have the disadvantages of poor reliability and high energy consumption; gas foil bearings are suitable for high speed and light load conditions, with large wear during the start-stop stage, and relatively low load capacity and stiffness at low speed.

[0004] Since the operating speed range and application scenarios of magnetic suspension bearings and air bearings partially overlap, and they can complement each other's disadvantages, the magnetic-gas hybrid bearing, which combines the advantages of both, solves the problems of friction between the shaft neck and the bearing surface and low bearing capacity at low speeds while maintaining the excellent performance of air bearings such as high speed and strong tolerance to temperature rise changes; the protective bearing of the magnetic suspension bearing is eliminated to simplify the system structure; the stiffness and damping of the system can be changed by adjusting the control parameters to improve the stability of the rotor at high speeds.

[0005] At present, a common type of magnetic hybrid bearing is an embedded magnetic hybrid bearing, which means that the magnetic suspension bearing and the air bearing provide support at the same axial position of the shaft system. The existing technical solutions usually use the air gap and slot space of the magnetic suspension bearing, use resin filling or directly process the inner surface of the magnetic pole, etc. to form the inner surface of the fixed foil structure. However, the above method has complex processing technology, and the air bearing part has poor reusability and is difficult to repair. Summary of the invention

[0006] The technical problems to be solved by the present invention 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 difficult repair.

[0008] The present invention adopts the following technical solutions to solve the above technical problems:

[0009] The present invention provides an embedded magnetic hybrid bearing, comprising an air 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 comprises a hybrid bearing seat flange with a neck, circular grooves are respectively provided 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, a stator axial limit 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 limit boss, the magnetic suspension bearing stator comprises 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 comprises an outer support flange, a circular groove is formed on one side of the neck of the outer support flange, the air bearing retaining ring is detachably arranged in the circular groove, and is used to limit the axial displacement of the corrugated foil and the top foil, and a plurality of spaced and evenly distributed outer support toothed platforms are arranged on the other side of the outer support flange where the circular groove is formed, and the plurality of outer support toothed platforms are surrounded to form a circular tubular structure;

[0012] The inner support structure comprises an inner support flange, a circular inner support stopper 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 stopper and are arranged at intervals and evenly distributed, and the plurality of inner support tooth-shaped platforms are surrounded to form a circular tubular structure;

[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 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 surrounded by the outer support toothed platform and the inner support toothed platform, and 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 has a concentric circle cross section, and a plurality of 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, a top foil fixing dovetail is provided on the inner wall of the outer supporting toothed platform along the extending 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 foils 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 toothed platforms, the number of the inner supporting toothed platforms 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 whose number 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 support structure is a non-magnetic outer support structure, the inner support structure is a non-magnetic inner support structure, and the top foil is a non-magnetic top foil.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1) The bearing's load capacity and working range are improved, and the bearing's continuous operation power consumption is reduced; the rotor can be supported by both the magnetic bearing and the air bearing at the working speed, and the bearing capacity is greatly improved compared to the gas foil bearing of the same size; the working range covers all speed and load ranges applicable to the magnetic bearing and the air bearing; when the air bearing bears the main load, the energy consumption of the magnetic bearing is reduced, and the possibility of coil temperature rise is reduced;

[0026] 2) The structure is compact and simple, easy to install and maintain; the inner and outer supporting structures are fixed with flanges that are easy to install and disassemble, and the magnetic suspension bearing stator magnetic pole slot space is used to form a support structure for the foil structure. Compared with the method of using resin filling or direct processing, this device can reduce the influence of the air bearing structure on the air gap of the magnetic suspension bearing during the embedding process, and the embedding is more reasonable; the processing technology is simple, and the air bearing structure is easy to repair and replace;

[0027] 3) The protective bearing set to prevent the rotor from falling due to sudden failure of the magnetic suspension bearing is cancelled, simplifying the system structure; since the foil structure can withstand a certain degree of impact load, it has the function of protecting the bearing, which can avoid direct contact between the rotor journal and the magnetic pole of the magnetic suspension bearing in the rotating state, eliminating the rotor length used for the protective bearing in the shaft system, and the critical speed of the rotor can be effectively improved;

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

[0029] Figure 1 An exploded view of an embedded magnetic hybrid bearing in an embodiment of the present invention;

[0030] Figure 2 An assembly diagram of an embedded magnetic hybrid bearing according to an embodiment of the present invention;

[0031] Figure 3 is a cross-sectional view of an embedded magnetic hybrid bearing in an embodiment of the present invention;

[0032] Figure 4 A schematic diagram of the internal and external support structures in an embodiment of the present invention;

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

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

[0035] Figure 7 Schematic diagram of the structure of the air bearing foil in the embodiment of the present invention, 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 limiting 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 the various embodiments, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", 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 components and devices referred to must be operated according to the specific directions and defined operations and methods and structures in the specification. Such directional 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: Combine Figures 1 to 7 As shown, the present invention provides an embedded magnetic hybrid bearing, comprising an air 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 comprises a hybrid bearing seat flange 6d with a neck, and circular grooves are respectively opened on both sides of the neck, and the outer support structure 2 and the inner support structure 8 are respectively fixed in the circular grooves on both sides. Figure 2 As 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, which 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. 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 opposite direction of the arrow direction of 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, a plurality of inner support toothed stages 8c are provided on the inner wall of the inner support stop 8a, the plurality of inner support toothed stages 8c are surrounded to form a circular tubular structure, and the circular tubular structure formed by the plurality of outer support toothed stages 2f has the same inner diameter as the circular tubular structure formed by the plurality of inner support toothed stages 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, and the end of the outer support toothed platform 2f is staggered 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 surrounded 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 supporting toothed platform 2f, the inner supporting toothed platform 8c and the magnetic pole boss 5c, and the cross section is a concentric circle, and multiple corrugated foils 3 are arranged between the top foil 4 and the complete cylindrical surface formed by the outer supporting toothed platform 2f, the inner supporting toothed platform 8c and the magnetic pole boss 5c.

[0046] Combination Figure 7 As shown in (b), a baffle is provided on one side of the corrugated foil 3, combined with Figure 7As 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 supporting toothed platform 2f along the extension direction of the outer supporting toothed platform 2f, and during installation, the interface of the top foil 4 is clamped between the top foil fixing dovetail 2d and the outer supporting toothed platform 2f; 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, 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, lead out the copper wire of the stator coil 7 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 suspension 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 toothed platform 8c is greater than the length of the inner support stop 8a, and the inner support toothed platform 8c can be inserted into the gap between the outer support toothed 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 provided with a hybrid bearing circumferential mounting hole 6b, and the outer wall of the magnetic bearing stator 5 is provided with a stator fixing groove 5a in the circumferential direction. 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 hole 6b; the magnetic bearing stator 5 is placed in the magnetic hybrid bearing seat 6 by a shrink sleeve method until the magnetic bearing stator 5 contacts the stator axial positioning boss 6c, so that the position of the magnetic bearing stator 5 can be fixed in the axial direction, and the hexagon socket screw is screwed into the hybrid bearing circumferential mounting hole 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 toothed stages 2f, the number of the inner supporting toothed 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 outlet holes 2b, the number of which 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, and the air bearing retaining ring 1 is fixed to the outer support flange 2g by bolts.

[0057] Working principle:

[0058] When the rotor shaft system is in a low-speed state including the start-stop stage, the gas dynamic pressure effect is not formed, and the magnetic suspension bearing bears all the loads to avoid mechanical friction between the journal and the top foil surface. Above the take-off speed of the air bearing, by adjusting the control parameters of the magnetic hybrid bearing, the load distribution between the two support methods is dynamically adjusted according to the rotor speed. At high speeds, the air bearing can bear the main or even all loads. At this time, the magnetic suspension bearing plays an auxiliary role, which can reduce the vibration amplitude of the rotor and improve the operation stability.

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

Claims

1. An embedded magnetic hybrid bearing, characterized in that: 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) comprises 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) comprises 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) comprises 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 toothed 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 toothed platforms (2f) are surrounded to form a circular tubular structure; The inner support structure (8) comprises 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 toothed platforms (8c) are arranged at intervals and evenly distributed on the inner wall of the inner support stop (8a), and the plurality of inner support toothed platforms (8c) are surrounded to form a circular tubular structure; 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 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 has a concentric circle cross section; a plurality of corrugated foils (3) are arranged between the complete cylindrical surface formed by 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 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 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), and the baffle of the corrugated foil (3) is clamped in the corrugated foil fixing groove (2c).

4. The embedded magnetic 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 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 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 hybrid bearing according to claim 6, characterized in that: The number of the outer supporting toothed platforms (2f), the number of the inner supporting toothed platforms (8c) and the number of the stator magnetic poles (5b) are the same.

8. The embedded magnetic 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 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 are used to extend the copper wires of the stator coil (7) out of the wire outlet holes (2b).

10. The embedded magnetic 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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