Embedded magnetic-air hybrid bearing

Abstract

An embedded magnetic-air hybrid bearing, comprising an air bearing retaining ring (1), an outer support structure (2), a bump foil (3), a top foil (4), a magnetic bearing stator (5), a magnetic-air hybrid bearing seat (6), a stator coil (7) and an inner support structure (8), wherein an outer support toothed platform (2f) of the outer support structure extends into a cylindrical space at the center of the magnetic bearing stator; an end of the outer support toothed platform and an inner support toothed platform (8c) of the inner support structure that extends into the cylindrical space at the center of the magnetic bearing stator are interlocked with each other in a staggered manner, forming a complete cylindrical surface; and the bump foil is wrapped around the top foil and is arranged in the assembled cylindrical surface. The embedded magnetic-air hybrid bearing can avoid direct contact between a journal and magnetic poles, such that the operating speed range and applicable load capacity of both a magnetic bearing and an air bearing are expanded, shafting stability is improved, and installation and maintenance are facilitated.

Description

An embedded magnetic hybrid bearing Technical Field

[0001] This invention relates to the field of bearing technology, and more specifically, to an embedded magnetic hybrid bearing. Background Technology

[0002] Bearings, as core components of rotating machinery, play a crucial role in the performance and reliability of mechanical systems. Magnetic levitation bearings are mechatronic products that use electromagnetic force to levitate the rotor at a reference position. Due to their non-mechanical contact and ability to be actively controlled, they are widely used in important fields such as flywheel energy storage, high-speed spindles, turbine machinery, and artificial satellites. Dynamic pressure foil air bearings are self-acting dynamic pressure gas bearings with flexible support surfaces. They also feature no lubrication required, no pollution, high rotational accuracy, and good self-adaptability. They do not compromise bearing manufacturing precision or rotor alignment; maintenance costs are low, and power consumption is minimal.

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

[0004] Because the operating speed ranges and application scenarios of magnetic levitation bearings and air bearings partially overlap, and they can complement each other's weaknesses, the hybrid magnetic-air bearing, which combines the advantages of both, solves the problems of journal-bearing surface friction and low load-bearing capacity at low speeds while maintaining the excellent performance of air bearings, such as high speed and strong resistance to temperature changes. It also eliminates the need for a protective bearing in magnetic levitation bearings, simplifying the system structure. Furthermore, it improves rotor stability at high speeds by adjusting control parameters to change the system's stiffness and damping.

[0005] Currently, a common type of magnetic-air hybrid bearing is the embedded magnetic-air hybrid bearing. This type of bearing combines a magnetic levitation bearing and an air bearing, providing support along the same axial direction within the shaft system. Existing technologies typically utilize the air gap and groove space of the magnetic levitation bearing, using methods such as resin filling or direct machining of the inner surface of the magnetic poles to form a fixed foil structure on the inner surface. However, these methods involve complex manufacturing processes, and the air bearing portion has poor reusability and is difficult to repair. Summary of the Invention

[0006] The technical problem to be solved by this invention is:

[0007] To address the problems of complex manufacturing processes, poor reusability of air bearing components, and difficulty in repair in existing embedded magnetic hybrid bearings.

[0008] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0009] This invention provides an embedded magnetic-air hybrid bearing, comprising an air bearing retaining ring, an outer support structure, corrugated foil, a top foil, a magnetic levitation bearing stator, a magnetic-air hybrid bearing housing, a stator coil, and an inner support structure.

[0010] The magnetic hybrid bearing housing includes a hybrid bearing housing 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 detachably fixed in the circular grooves on both sides. A stator axial limiting boss is provided on the inner wall of the neck. The magnetic levitation bearing stator is set in the neck and its movement is restricted by the stator axial limiting boss. The magnetic levitation bearing stator includes a plurality of stator magnetic poles that are evenly distributed in the circumference and point to the central axis of the shaft system. The end of the stator magnetic pole is a magnetic pole boss. A stator coil is wound on each stator magnetic pole.

[0011] The external support structure includes an external support flange. A circular groove is provided on one side of the neck of the external support flange. The air bearing retaining ring is detachably installed in the circular groove to limit the axial displacement of the corrugated foil and the top foil. On the other side of the external support flange where the circular groove is provided, there are multiple spaced and evenly distributed external support toothed platforms. The multiple external support toothed platforms surround a circular tubular structure.

[0012] The inner support structure includes an inner support flange. The inner support flange has an annular inner support stop on one side of its neck. The inner wall of the inner support stop has multiple spaced and evenly distributed inner support toothed platforms, which are arranged in a circular tube-like structure.

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

[0014] The top foil is disposed within the complete cylindrical surface formed by the outer support toothed platform, the inner support toothed platform, and the magnetic pole protrusion, and the cross-section is a concentric circle. Multiple corrugated foils are disposed between the top foil and the complete cylindrical surface formed by the outer support toothed platform, the inner support toothed platform, and the magnetic pole protrusion.

[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 support toothed platform along the extension direction of the outer support toothed platform. The interface of the top foil is snapped between the top foil fixing dovetail and the outer support toothed platform.

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

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

[0018] Furthermore, the number of 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 support toothed platform, the inner support toothed platform, and the magnetic pole protrusion 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 external support tooth profiles and the number of internal support tooth profiles are the same as the number of stator magnetic poles.

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

[0022] Furthermore, the outer support flange has outlet holes that are the same as or more than the number of stator magnetic poles, for extending the copper wires of the stator coil out of the 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 beneficial effects of the present invention are:

[0025] 1) Improved bearing load capacity and operating range, and reduced continuous operating power consumption of bearing; at rotor operating speed, it can be supported by both magnetic levitation bearing and air bearing, which greatly improves the load capacity compared with gas foil bearing of the same size; the operating range covers the entire speed and load range applicable to magnetic levitation bearing and air bearing; when the air bearing bears the main load, the energy consumption of magnetic levitation bearing is reduced, and the possibility of coil temperature rise is reduced.

[0026] 2) The structure is compact and simple, and easy to install and maintain; both the internal and external support structures are fixed with flanges that are easy to install and disassemble. The space of the magnetic pole slot of the magnetic levitation bearing stator 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 impact of the air bearing structure on the air gap of the magnetic levitation bearing during the embedding process, and the fitting 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 up to prevent the rotor from falling due to sudden failure of the magnetic levitation bearing has been eliminated, 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 levitation bearing in the rotating state, eliminating the rotor length used for the protective bearing in the shaft system, and the rotor critical speed can be effectively improved.

[0028] 4) This device supports online monitoring of rotor shaft system status data. By outputting the rotor data obtained during the control of the magnetic levitation bearing to the computer, the rotor operating status can be monitored, which can improve the reliability of system operation. Attached Figure Description

[0029] Figure 1 is an exploded view of an embedded magnetic hybrid bearing according to an embodiment of the present invention;

[0030] Figure 2 is 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 according to an embodiment of the present invention;

[0032] Figure 4 is a schematic diagram of the external support structure in an embodiment of the present invention;

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

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

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

[0036] Explanation of reference numerals in the attached drawings: 1. Air bearing retaining ring; 2. Outer support structure; 3. Corrugated foil; 4. Top foil; 5. Magnetic levitation bearing stator; 6. Magnetic-air hybrid bearing housing; 7. Stator coil; 8. Inner support structure; 9. Axial direction; 1a. Retaining ring fixing threaded hole one; 2a. Outer support fixing threaded hole; 2b. Outlet hole; 2c. Corrugated foil fixing groove; 2d. Top foil fixing dovetail; 2e. Retaining ring fixing threaded hole two; 2f. Outer support toothed platform; 2g. Outer support flange; 5a. Stator fixing groove; 5b. Stator magnetic pole; 5c. Magnetic pole boss; 6a. Hybrid bearing mounting hole; 6b. Hybrid bearing circumferential mounting hole; 6c. Stator axial limiting boss; 6d. Hybrid bearing housing flange; 8a. Inner support stop; 8b. Inner support fixing threaded hole; 8c. Inner support toothed platform; 8d. Inner support flange. Detailed Implementation

[0037] In the description of this invention, it should be noted that the terms used in the various embodiments, such as "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," which indicate orientation, are only used to simplify the description of the positional relationships based on the accompanying drawings. They do not mean that the components and devices referred to must be operated in accordance with the specific orientations and defined operations, methods, and structures in the specification. Such directional terms do not constitute a limitation of this invention.

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] Specific Implementation Scheme 1: Referring to Figures 1 to 7, the present invention provides an embedded magnetic-air hybrid bearing, including an air-bearing retaining ring 1, an outer support structure 2, a corrugated foil sheet 3, a top foil sheet 4, a magnetic levitation bearing stator 5, a magnetic-air hybrid bearing seat 6, a stator coil 7, and an inner support structure 8.

[0040] The magnetic hybrid bearing housing 6 includes a hybrid bearing housing flange 6d with a neck. 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. As shown in Figure 2, the outer support structure 2 and the inner support structure 8 are both embedded into the end of the hybrid bearing housing flange 6d. This configuration 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 housing flange 6d. The magnetic levitation bearing stator 5 is disposed in the neck and its movement in the opposite direction to the arrow direction of the axial direction 9 is restricted by the stator axial limiting boss 6c. The magnetic levitation bearing stator 5 includes a plurality of circumferentially distributed stator magnetic poles 5b pointing to the central axis of the shaft system. The end of the stator magnetic pole 5b is a magnetic pole boss 5c. A stator coil 7 is wound on each stator magnetic pole 5b.

[0041] 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 installed in the circular groove to limit the axial displacement of the corrugated foil 3 and the top foil 4. As shown in Figure 2, the air bearing retaining ring 1 is embedded in the end of the outer support flange 2g. On the other side of the outer support flange 2g where the circular groove is provided, there are multiple spaced and evenly distributed outer support toothed platforms 2f. The multiple outer support toothed platforms 2f surround a circular tubular structure.

[0042] The inner support structure 8 includes an inner support flange 8d. The inner support flange 8d has an annular inner support stop 8a on one side of its neck. The inner wall of the inner support stop 8a has a plurality of spaced and evenly distributed inner support toothed platforms 8c. The plurality of inner support toothed platforms 8c surround a circular tube structure. The circular tube structure surrounded by a plurality of outer support toothed platforms 2f has the same inner diameter as the circular tube structure surrounded by a plurality of inner support toothed platforms 8c.

[0043] The outer support toothed platform 2f of the outer support structure 2 extends into the cylindrical space at the center of the magnetic levitation bearing stator 5. The end of the outer support toothed platform 2f is staggered with the inner support toothed platform 8c of the inner support structure 8 that extends into the cylindrical space at the center of the magnetic levitation bearing stator 5. The magnetic pole protrusion 5c is set 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 protrusion 5c together form a complete cylindrical surface, which is used to provide support for the corrugated foil 3 and the top foil 4 of the air bearing.

[0044] The top foil 4 is disposed within the complete cylindrical surface formed by the outer support toothed platform 2f, the inner support toothed platform 8c, and the magnetic pole protrusion 5c, and the cross-section is a concentric circle. Multiple corrugated foils 3 are disposed 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 protrusion 5c.

[0045] As shown in Figure 7(b), a baffle is provided on one side of the corrugated foil 3. As shown in Figure 7(a), the top foil 4 is a whole rectangular plate structure bent into a cylindrical structure. The inner wall of an outer support toothed platform 2f is provided with a top foil fixing dovetail 2d extending along the outer support toothed platform 2f. During installation, the interface of the top foil 4 is snapped 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 extending along the outer support toothed platform 2f. The baffle of the corrugated foil 3 is snapped into the corrugated foil fixing groove 2c. During installation, insert the outer support toothed platform 2f into the space of the stator pole 5b slot in the opposite direction of the arrow in the axial direction 9. After adjusting the circumferential position of the outer support fixing threaded hole 2a to match the internal threaded hole of the circular groove of the magnetic mixing bearing seat 6, lead out the copper wire of the stator coil 7 through the wire outlet hole 2b on the outer support flange 2g. The number of wire outlet holes 2b is determined according to the number of stator poles 5b of the magnetic levitation bearing. Finally, use an Allen screw to screw into the outer support fixing threaded hole 2a to fix the outer support structure 2. Insert the inner support toothed platform 8c into the gap of the outer support toothed platform 2f in the axial direction 9, and use an Allen screw to screw into the inner support fixing threaded hole 8b to fix the inner support structure 8.

[0046] 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.

[0047] The inner diameter of the stator axial limiting boss 6c is smaller than the outer diameter of the magnetic levitation bearing stator 5. The neck of the magnetic-gas hybrid bearing housing 6 is provided with a hybrid bearing circumferential mounting hole 6b, and the outer wall of the magnetic levitation bearing stator 5 is 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 levitation bearing stator 5 is fixed in the magnetic-gas hybrid bearing housing 6 by bolts. During installation, the magnetic levitation 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 levitation bearing stator 5 is placed into the magnetic-gas hybrid bearing housing 6 using a heat-shrink method until it contacts the stator axial positioning boss 6c, thus fixing the position of the magnetic levitation bearing stator 5 axially. Finally, the hexagonal socket screws are screwed into the hybrid bearing circumferential mounting holes 6b to lock the circumferential position of the magnetic levitation bearing stator 5.

[0048] The hybrid bearing housing 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 machinery system through the hybrid bearing mounting holes 6a.

[0049] The stator 5 of the magnetic levitation bearing is made of stacked silicon steel sheets, which can reduce the hysteresis loss and eddy current loss of the magnetic levitation bearing; the number of stator magnetic poles 5b can be 3, 4, 8 or 16, and can also be increased or decreased according to the actual situation.

[0050] The number of corrugated foil sheets 3 is at least one, and the arch height of the corrugated foil sheet 3 is the difference between the inner diameter of the complete cylindrical surface formed by the outer support toothed platform 2f, the inner support toothed platform 8c, and the magnetic pole protrusion 5c and the outer diameter of the top foil sheet 4.

[0051] The top foil 4 is made of non-magnetic material, and the inner surface of the top foil 4 is coated 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.

[0052] Both the outer support structure 2 and the inner support structure 8 are made of aluminum alloy, ceramic or other non-magnetic materials.

[0053] The number of external support tooth profiles 2f, the number of internal support tooth profiles 8c, and the number of stator magnetic poles 5b are the same.

[0054] The outer support flange 2g has multiple 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 has the same number of outlet holes 2b as or more than the number of stator magnetic poles 5b, for extending the copper wire of the stator coil 7 out of the outlet holes 2b; the inner support flange 8d has multiple inner support fixing threaded holes 8b, and the inner support structure 8 is fixed to the magnetic hybrid bearing seat 6 by bolts.

[0055] The air bearing retaining ring 1 is provided with multiple retaining ring fixing threaded holes 1a, and the outer support structure 2 is provided with multiple 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.

[0056] Working principle:

[0057] At low speeds, including the start-stop phase, the rotor shaft system does not experience a gas dynamic pressure effect, and the magnetic levitation bearing bears the entire load, avoiding mechanical friction between the 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 according to the rotor speed by adjusting the control parameters of the hybrid magnetic bearing. At high speeds, the air bearing can bear the main or even all of the load, while the magnetic levitation bearing plays an auxiliary role, reducing rotor vibration amplitude and improving operational stability.

[0058] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. An embedded magnetic- gas hybrid bearing, characterized by: It includes an air bearing retaining ring (1), an outer support structure (2), corrugated foil (3), a top foil (4), a magnetic levitation bearing stator (5), a magnetic-air hybrid bearing housing (6), a stator coil (7), and an inner support structure (8). The magnetic hybrid bearing housing (6) includes a hybrid bearing housing flange (6d) with a neck. Circular grooves are opened on both sides of the neck. The outer support structure (2) and the inner support structure (8) are 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 levitation bearing stator (5) is set in the neck and its movement is restricted by the stator axial limiting boss (6c). The magnetic levitation bearing stator (5) includes a plurality of stator magnetic poles (5b) evenly distributed in the circumference pointing to the central axis of the shaft system. The end of the stator magnetic pole (5b) is a magnetic pole boss (5c). A stator coil (7) is wound on each stator magnetic pole (5b). The external support structure (2) includes an external support flange (2g). A circular groove is provided on one side of the neck of the external support flange (2g). The air bearing retaining ring (1) is detachably installed in the circular groove to limit the axial displacement of the corrugated foil (3) and the top foil (4). On the other side of the external support flange (2g) with the circular groove, there are multiple spaced and evenly distributed external support toothed platforms (2f). The multiple external support toothed platforms (2f) surround a circular tube structure. The inner support structure (8) includes an inner support flange (8d), and an annular inner support stop (8a) is provided on one side of the neck of the inner support flange (8d). Multiple spaced and evenly distributed inner support toothed platforms (8c) are provided on the inner wall of the inner support stop (8a), and the multiple inner support toothed platforms (8c) surround a circular tube structure. The outer support toothed platform (2f) of the outer support structure (2) extends into the cylindrical space at the center of the magnetic levitation bearing stator (5). 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 levitation bearing stator (5). The magnetic pole boss (5c) is set 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 disposed within the complete cylindrical surface formed by the outer support toothed platform (2f), the inner support toothed platform (8c), and the magnetic pole protrusion (5c), and the cross-section is a concentric circle. Multiple corrugated foils (3) are disposed 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 protrusion (5c).

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

3. The hybrid embedded magnetic gas bearing of claim 2, wherein: The top foil (4) is a rectangular plate structure bent into a cylindrical structure. The outer support toothed platform (2f) is provided with a corrugated foil fixing groove (2c) along the extension direction of the outer support toothed platform (2f). The baffle of the corrugated foil (3) is engaged in the corrugated foil fixing groove (2c).

4. The hybrid embedded magnetic gas bearing of claim 3, wherein: The number of stator magnetic poles (5b) is 3, 4, 8 or 16.

5. The hybrid embedded magnetic gas bearing of claim 3, wherein: The number of corrugated foils (3) is at least one piece, 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 support toothed platform (2f), the inner support toothed platform (8c) and the magnetic pole protrusion (5c) and the outer diameter of the top foil (4).

6. An embedded magnetic- aerodynamic 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. An embedded magnetic gas hybrid bearing according to claim 6, characterized in that: The number of external support tooth profiles (2f), internal support tooth profiles (8c), and stator magnetic poles (5b) are the same.

8. An embedded magnetic- aerodynamic 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 levitation bearing stator (5).

9. An embedded magnetic- aerodynamic hybrid bearing according to claim 8, characterized in that: The outer support flange (2g) has outlet holes (2b) that are the same as or more than the number of stator magnetic poles (5b), for extending the copper wire of the stator coil (7) out of the outlet holes (2b).

10. The hybrid embedded magnetic gas bearing of claim 9, wherein: 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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