A magnetic levitation bearing and a magnetic levitation motor

Abstract

This application discloses a magnetic levitation bearing and a magnetic levitation motor, relating to the field of magnetic levitation technology. The bearing includes a housing, a stator assembly, a rotor assembly, and a shaft end cap. A first guide groove is formed on the inner wall of the housing, and an air intake channel communicating with the outside is formed through the side wall of the housing. The two axial ends of the inner cavity of the housing are the air intake end and the air outlet end, respectively. The first end of the first guide groove and the air intake channel are both connected to the air intake end. The stator assembly is disposed within the inner cavity of the housing and is partially arranged opposite to the first guide groove. Airflow can directly contact and exchange heat with the stator assembly when flowing through the first guide groove. The shaft end cap is disposed within the inner cavity of the housing and has an air outlet channel connecting the second end of the first guide groove and the air outlet end, allowing airflow from the first guide groove to flow to the air outlet end. The magnetic levitation bearing disclosed in this application significantly reduces airflow resistance by optimizing the airflow guiding structure, thereby improving heat dissipation efficiency while significantly reducing the power consumption of the cooling system.

Description

Technical Field

[0001] This application relates to the field of magnetic levitation technology, and more specifically, to a magnetic levitation bearing and a magnetic levitation motor. Background Technology

[0002] As high-speed magnetic levitation motors develop towards higher power density and miniaturization, their heat dissipation challenges become increasingly severe, with temperature rise control of magnetic levitation bearings being particularly critical. The heating of magnetic levitation bearings is mainly caused by iron losses (including stator and rotor) due to high-frequency current, winding copper losses, and rotor aerodynamic heating. Inadequate heat dissipation not only accelerates the aging of insulation materials but also causes nearby displacement sensors to fail or generate significant errors due to thermal drift. This, in turn, leads to erroneous commands from the control system, seriously threatening stable rotor operation and ultimately causing equipment shutdown and production losses.

[0003] Existing cooling solutions generally have limitations. Traditional internal air-cooling systems for motors rely on cooling airflow through the stator-rotor air gap. However, the stator-rotor gap of magnetic levitation bearings is only 0.3mm-0.5mm, much smaller than the motor's air gap. This tiny gap creates significant flow resistance under high-speed rotor rotation, making it difficult for cooling airflow to penetrate effectively, resulting in extremely poor heat dissipation. Therefore, to achieve even limited heat dissipation, high-pressure fans must be used, significantly increasing energy consumption. Some solutions attempt improvements such as opening holes in the end housing or adding heat dissipation fins. The former is still limited by the tiny gap and cannot achieve effective cooling, while the latter has limited heat dissipation efficiency. Neither can meet the heat dissipation requirements of magnetic levitation bearings under long-term continuous operation and complex environmental conditions.

[0004] Therefore, how to effectively dissipate heat from magnetic levitation bearings has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a magnetic levitation bearing to achieve effective heat dissipation of the magnetic levitation bearing.

[0006] Another objective of this application is to provide a magnetic levitation motor including the aforementioned magnetic levitation bearing.

[0007] A magnetic levitation bearing, comprising:

[0008] The outer casing has a first guide groove on its inner wall, which extends along the axial direction of the outer casing. An air intake channel communicating with the outside is provided on the side wall of the outer casing. The two ends of the inner cavity of the outer casing in the axial direction are the air intake end and the air outlet end, respectively. The first end of the first guide groove and the air intake channel are both connected to the air intake end.

[0009] A stator assembly is disposed in the inner cavity of the housing and located between the air inlet end and the air outlet end. Along the radial direction of the stator assembly, a portion of the stator assembly is arranged opposite to the first guide groove.

[0010] A rotor assembly rotatably passing through the stator assembly;

[0011] A shaft end cap is disposed in the inner cavity of the housing and connected to the stator assembly and the housing. The shaft end cap is provided with an air outlet channel, which connects the second end of the first guide groove and the air outlet end.

[0012] In some embodiments, the stator assembly includes:

[0013] The yoke is a ring-shaped structure, and a portion of the circumferential outer wall of the yoke is arranged opposite to the first guide groove, and the shaft end cap abuts against the yoke.

[0014] Multiple teeth are spaced apart on the inner wall of the yoke and extend radially along the yoke, and the rotor assembly rotatably passes through the central region surrounded by each of the teeth;

[0015] Multiple stator windings, each stator winding is wound one-to-one with each of the teeth;

[0016] Multiple slot wedges are provided between two adjacent teeth and abut against the side of the stator winding opposite to the yoke.

[0017] In some embodiments, a second guide groove is provided between the slot wedge and the rotor assembly, and the two ends of the second guide groove are respectively connected to the air inlet end and the air outlet end.

[0018] In some embodiments, the middle position of the slot wedge protrudes away from the rotor assembly to form the second guide groove with the rotor assembly.

[0019] In some embodiments, a third guide groove is provided between two adjacent teeth, and the two ends of the third guide groove are respectively connected to the air inlet end and the air outlet end.

[0020] In some embodiments, the slotted wedge and the toothed portion are either an integral structure or separate structures;

[0021] And / or, the yoke and the teeth are either an integral structure or a separate structure.

[0022] In some embodiments, there are multiple first guide grooves, and the first guide grooves are arranged in a one-to-one correspondence with the teeth along the radial direction of the yoke.

[0023] In some embodiments, the air intake channel is a plurality of channels that are connected to the first guide channel in a one-to-one manner.

[0024] In some embodiments, the shaft end cap is an annular structure, the air outlet channel is disposed on the inner wall of the shaft end cap, and the air outlet channel gradually tilts towards the central axis of the stator assembly from the air inlet end to the air outlet end.

[0025] In some embodiments, along the direction from the air inlet to the air outlet, the inner wall of the housing is provided with a first positioning step surface and a second positioning step surface at intervals. The first positioning step surface and the second positioning step surface are both annular structures arranged in the direction of the air outlet, and the outer diameter of the first positioning step surface is equal to the inner diameter of the second positioning step surface.

[0026] The end face of the first end of the stator assembly abuts against the first positioning step surface, the outer ring side of the end face of the shaft end cap is connected to the second positioning step surface, and the inner ring side of the end face of the shaft end cap abuts against the end face of the second end of the stator assembly.

[0027] In some embodiments, the stator assembly protrudes 0.1mm-0.2mm from the second positioning step surface along the axial direction of the stator assembly.

[0028] A magnetic levitation motor, comprising the magnetic levitation bearing described in any of the preceding claims.

[0029] The magnetic levitation bearing provided in this application includes a housing, a stator assembly, a rotor assembly, and a shaft end cap. A first guide groove is provided on the inner wall of the housing, and the first guide groove extends along the axial direction of the housing. An air inlet channel communicating with the outside is provided through the side wall of the housing. The two ends of the inner cavity of the housing are defined as the air inlet end and the air outlet end, respectively. The first end of the first guide groove and the air inlet channel are both connected to the air inlet end. The stator assembly is disposed in the inner cavity of the housing, located between the air inlet end and the air outlet end, and is arranged radially along the stator assembly. The stator assembly part is arranged opposite to the first guide groove so that the airflow can directly contact the stator assembly for heat exchange when flowing through the first guide groove. The rotor assembly rotatably passes through the stator assembly. The shaft end cap is disposed in the inner cavity of the housing and is connected to the stator assembly and the housing to fix the position of the stator assembly on the housing. An air outlet channel is provided on the shaft end cap, which connects the second end of the first guide groove and the air outlet end so that the airflow in the first guide groove can flow to the air outlet end. External airflow can enter the air inlet end of the inner cavity of the outer shell through the air inlet channel, then flow through the first guide groove and exchange heat with the stator assembly, and finally flow through the air outlet channel to the air outlet end of the outer shell, thereby achieving comprehensive and rapid cooling of the magnetic levitation bearing.

[0030] Compared to related technologies, the magnetic levitation bearing provided in this application significantly reduces airflow resistance by optimizing the airflow guiding structure. This improves heat dissipation efficiency while greatly reducing the power consumption of the cooling system, ensuring that the temperature rise of the magnetic levitation bearing during operation can be effectively controlled, thereby guaranteeing its operational stability and avoiding risks such as displacement sensor drift caused by high temperatures. In addition, the reduction in operating temperature also reduces the resistivity of the magnetic bearing winding, further improving the electromagnetic efficiency of the magnetic levitation bearing itself. The magnetic levitation bearing disclosed in this application is suitable for harsh operating conditions with frequent current adjustments, effectively suppressing the resulting intense heat generation, meeting the heat dissipation and stability requirements of the magnetic levitation bearing under long-term service, and ultimately improving the overall energy efficiency of the magnetic levitation motor.

[0031] The magnetic levitation motor provided in this application includes the aforementioned magnetic levitation bearing, and therefore also possesses the aforementioned structure and beneficial effects. Other structures are described in reference to relevant technologies and will not be elaborated upon here. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is an exploded view of the magnetic levitation bearing disclosed in the embodiments of this application;

[0034] Figure 2 This is a front view of the magnetic levitation bearing disclosed in an embodiment of this application;

[0035] Figure 3 for Figure 2 Cross-sectional view at point AA;

[0036] Figure 4 for Figure 2 Cross-sectional view at point BB;

[0037] Figure 5 This is an isometric view of the housing disclosed in the embodiments of this application;

[0038] Figure 6 A cross-section of the casing disclosed in the embodiments of this application. Figure 1 ;

[0039] Figure 7 A cross-section of the casing disclosed in the embodiments of this application. Figure 2 ;

[0040] Figure 8 This is a front view of the casing disclosed in an embodiment of this application;

[0041] Figure 9 This is an isometric view of the shaft end cap disclosed in the embodiments of this application;

[0042] Figure 10 This is a front view of the shaft end cap disclosed in an embodiment of this application;

[0043] Figure 11 This is a rear view of the shaft end cap disclosed in an embodiment of this application.

[0044] Among them, 100 is the outer shell, 101 is the first guide groove, 102 is the air intake channel, 103 is the first positioning step surface, and 104 is the second positioning step surface;

[0045] 200 is the stator assembly, 201 is the second guide slot, 202 is the third guide slot, 210 is the yoke, 220 is the tooth, 230 is the stator winding, and 240 is the slot wedge.

[0046] 300 is the rotor assembly;

[0047] 400 is the shaft end cap, and 401 is the air outlet channel;

[0048] 500 is a connector. Detailed Implementation

[0049] The core of this application is to disclose a magnetic levitation bearing to achieve effective heat dissipation of the magnetic levitation bearing.

[0050] Another key aspect of this application is the disclosure of a magnetic levitation motor that includes the aforementioned magnetic levitation bearing.

[0051] The embodiments will now be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the invention as described in the claims. Additionally, the complete contents of the structures represented in the embodiments below are not limited to those necessary for the solution of the invention as described in the claims. It should be noted that, for ease of description, only the parts relevant to the invention are shown in the drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0052] Combination Figures 1-11The magnetic levitation bearing disclosed in this application includes a housing 100, a stator assembly 200, a rotor assembly 300, and a shaft end cap 400. A first guide groove 101 is formed on the inner wall of the housing 100, and the first guide groove 101 extends axially along the housing 100. An air intake channel 102 communicating with the outside is formed through the side wall of the housing 100. The two ends of the inner cavity of the housing 100 are defined as the air intake end and the air outlet end, respectively. The first end of the first guide groove 101 and the air intake channel 102 are both connected to the air intake end. The stator assembly 200 is disposed in the inner cavity of the housing 100, located between the air intake end and the air outlet end, and extends axially along the stator assembly. In the radial direction of 200, the stator assembly 200 is partially arranged opposite to the first guide groove 101 so that the airflow can directly contact the stator assembly 200 for heat exchange when flowing through the first guide groove 101. The rotor assembly 300 rotatably passes through the stator assembly 200. The shaft end cap 400 is disposed in the inner cavity of the housing 100 and is connected to the stator assembly 200 and the housing 100 to fix the position of the stator assembly 200 on the housing 100. The shaft end cap 400 is provided with an air outlet channel 401, which connects the second end of the first guide groove 101 and the air outlet end so that the airflow in the first guide groove 101 can flow to the air outlet end.

[0053] Combination Figure 2 and Figure 3 External airflow can enter the air inlet end of the inner cavity of the outer shell 100 through the air inlet channel 102, then flow through the first guide groove 101 to exchange heat with the stator assembly 200, and finally flow through the air outlet channel 401 to the air outlet end of the outer shell 100, thereby achieving comprehensive and rapid cooling of the magnetic levitation bearing.

[0054] Compared to existing technologies, the magnetic levitation bearing disclosed in this application significantly reduces airflow resistance by optimizing the airflow guiding structure. This improves heat dissipation efficiency while greatly reducing the power consumption of the cooling system, ensuring that the temperature rise of the magnetic levitation bearing during operation can be effectively controlled, thereby guaranteeing its operational stability and avoiding risks such as displacement sensor drift caused by high temperatures. In addition, the reduction in operating temperature also reduces the resistivity of the magnetic bearing winding, further improving the electromagnetic efficiency of the magnetic levitation bearing itself. The magnetic levitation bearing disclosed in this application is suitable for harsh operating conditions with frequent current adjustments, effectively suppressing the resulting intense heat generation, meeting the heat dissipation and stability requirements of magnetic levitation bearings under long-term service, and ultimately improving the overall energy efficiency of the magnetic levitation motor.

[0055] Specifically, in combination Figure 2 and Figure 3The stator assembly 200 may include a yoke 210, multiple teeth 220, multiple stator windings 230, and multiple slot wedges 240. The yoke 210 has a ring-shaped structure and serves as the core of a closed magnetic circuit, providing a low magnetic reluctance channel for the magnetic field. Part of the circumferential outer wall of the yoke 210 is arranged opposite to the first guide groove 101, and the shaft end cap 400 abuts against the yoke 210. Each tooth 220 is spaced apart on the inner wall of the yoke 210 and extends radially along the yoke 210 to support the stator winding. The stator winding 230 and the rotor assembly 300 are rotatably passed through the central area of ​​each tooth 220 and are in clearance fit with each tooth 220; each stator winding 230 is wound on each tooth 220 in a corresponding manner; the slot wedge 240 is disposed between two adjacent teeth 220 and abuts against the side of the stator winding 230 facing away from the yoke 210, so as to stabilize the stator winding 230 on the teeth 220 and prevent the stator winding 230 from loosening or displacing due to electromagnetic vibration or centrifugal force during motor operation.

[0056] Furthermore, combined Figure 2 and Figure 4 A second guide groove 201 is provided between the slot wedge 240 and the rotor assembly 300. The two ends of the second guide groove 201 are connected to the air inlet end and the air outlet end, respectively, so that the airflow at the air inlet end can pass through the second guide groove 201 and exchange heat with the rotor assembly 300 and the slot wedge 240, thereby achieving cooling of the stator assembly 200 and the rotor assembly 300.

[0057] In some embodiments, the slot wedge 240 protrudes away from the rotor assembly 300 to form a second guide groove 201 with the rotor assembly 300. Exemplarily, in combination with... Figure 2 The slot wedge 240 can be a strip structure with a V-shaped cross section. The slot wedge 240 can reduce airflow resistance and aerodynamic noise at the same time.

[0058] Combination Figure 2 and Figure 4 In some embodiments, a third guide groove 202 is provided between two adjacent teeth 220. The two ends of the third guide groove 202 are connected to the air inlet and the air outlet, respectively. When the airflow flows through the third guide groove 203, it can exchange heat synchronously with the teeth 220, the stator winding 230 and the slot wedge 240, effectively reducing the overall temperature of the stator assembly 200. Specifically, the slot wedge 240 can be molded. Its structural dimensions are designed to take into account the heat distribution of the magnetic levitation bearing rotor assembly 300 and the stator assembly 200, so as to reasonably distribute the flow rate in the second guide groove 201 and the third guide groove 202, ensuring that the flow rate is proportional to the heat generation power of each component, thereby effectively avoiding the problem of poor heat dissipation caused by excessive local flow resistance.

[0059] The aforementioned slot wedge 240 and tooth 220 can be an integral or separate structure; the yoke 210 and tooth 220 can also be an integral or separate structure. Through the flexible configuration of the slot wedge 240 and tooth 220, and the yoke 210 and tooth 220, with either an integral or separate structure, the decoupling and synergistic optimization of mechanical and electromagnetic performance are achieved. Specifically, an integral structure enhances overall rigidity, simplifies assembly processes, and ensures the continuity of the magnetic circuit, thereby reducing magnetic reluctance and core loss. A separate structure allows for the selection of optimal materials and processing techniques for different functional areas. For example, high-permeability, low-loss silicon steel sheets can be used in the tooth 220 to optimize the magnetic field distribution, while high-strength or easily formable composite materials can be used in the yoke 210 or slot wedge 240. Furthermore, through modular design, while ensuring structural strength, local magnetic saturation and eddy current effects are effectively suppressed, ultimately achieving a comprehensive improvement in the dynamic response accuracy and operational stability of the magnetic levitation bearing.

[0060] The stator winding 230 can optimize the magnetic circuit distribution and suppress parasitic effects by adopting a specific geometric configuration or by using a potting mold to form its slot profile. Its precisely designed profile can guide the magnetic lines of force to concentrate through the air gap, thereby maximizing the levitation force and reducing losses. At the same time, the integrated structure formed by the potting process can effectively resist mechanical vibration and significantly improve heat dissipation efficiency and insulation performance, ensuring the load-bearing capacity and operational stability of the magnetic levitation bearing.

[0061] Since the stator winding 230 is one of the main heat sources of copper loss when current passes through it, the heat generated will first be directly transferred to the closely contacting teeth 220, and then to the yoke 210. Therefore, the temperature of the yoke 210, which is opposite to and connected to the teeth 220, is higher than the temperature of the part without teeth 220. Accordingly, there can be multiple first guide grooves 101, and each first guide groove 101 is arranged in a one-to-one correspondence with each tooth 220 along the radial direction of the yoke 210, thereby achieving a targeted heat dissipation effect.

[0062] Correspondingly, the air intake channel 102 can be multiple channels that are connected to the first guide groove 101 one by one. When assembling the magnetic levitation bearing, the stator winding 230 is first aligned with the first guide groove 101 on the housing 100 for installation, and then the air outlet channel 401 on the shaft end cover 400 is aligned with the stator winding 230 for installation.

[0063] Combination Figures 9-11The shaft end cap 400 has an annular structure, and the circumferential outer wall of the shaft end cap 400 is arranged in close contact with the inner cavity side wall of the outer shell 100, which can enhance the radial stiffness of the shaft end cap 400 and improve the stability of the magnetic levitation bearing operation. The exhaust channel 401 can be set on the inner wall of the shaft end cap 400, and the exhaust channel 401 gradually tilts towards the central axis of the stator assembly 200 from the air inlet end to the air outlet end. The specific tilt angle is designed using fluid dynamics parameters to enhance the cooling effect by utilizing the eddy current effect.

[0064] The shaft end cap 400 is made of non-magnetic material to avoid affecting the magnetic circuit in the stator assembly 200 after installation. Figure 1 The shaft end cap 400 and the outer casing 100 can be connected by screws or other connectors 500.

[0065] In some embodiments disclosed in this application, combined with Figures 4-8 Along the direction from the air inlet to the air outlet, the inner wall of the outer casing 100 is provided with a first positioning step surface 103 and a second positioning step surface 104 at intervals. Both the first positioning step surface 103 and the second positioning step surface 104 are annular structures arranged in the direction of the air outlet, and the outer diameter of the first positioning step surface 103 is equal to the inner diameter of the second positioning step surface 104. The end face of the first end of the stator assembly 200 abuts against the first positioning step surface 103, the outer ring side of the end face of the shaft end cap 400 is connected to the second positioning step surface 104, and the inner ring side of the end face of the shaft end cap 400 abuts against the end face of the second end of the stator assembly 200, thereby reliably fixing the stator assembly 200 on the first positioning step surface 103 and effectively reducing the electromagnetic vibration of the magnetic levitation bearing.

[0066] Specifically, along the axial direction of the stator assembly 200, the stator assembly 200 protrudes from the second positioning step surface 104, and the protrusion length can be 0.1mm-0.2mm, thereby achieving an interference fit axial clamping of the shaft end cap 400 onto the stator assembly 200, ensuring that the stator assembly 200 can be firmly pressed onto the first positioning step surface 103, thereby ensuring the rigidity and accuracy of the entire magnetic levitation bearing and reducing electromagnetic vibration noise.

[0067] The structure of the rotor assembly 300 is prior art and will not be described in detail in this application.

[0068] The magnetic levitation bearing disclosed in this application has an airflow guiding structure that enables direct heat exchange between cooling air and the stator assembly 200 and rotor assembly 300, effectively reducing thermal resistance and airflow pressure drop, achieving all-round efficient cooling, thereby reducing operating energy consumption, controlling the temperature rise of sensors, improving system stability, and reducing the failure risk of the magnetic levitation motor.

[0069] The magnetic levitation motor disclosed in this application includes the magnetic levitation bearing described above, and therefore also has the above-mentioned structure and beneficial effects. Other structures refer to related technologies and will not be described in detail here.

[0070] The terms "first" and "second," etc., used in the specification and claims of this application are used to distinguish different objects, not to describe a specific order, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed. Additionally, in the description of embodiments in this application, "a plurality of" means two or more.

[0071] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Specific technical means in some embodiments may be incorporated, in whole or in part, into another embodiment unless explicitly excluded by another embodiment. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A magnetic bearing, characterized by, include: The outer casing (100) has a first guide groove (101) on its inner wall, and the first guide groove (101) extends along the axial direction of the outer casing (100). An air intake channel (102) communicating with the outside is provided on the side wall of the outer casing (100). The two ends of the inner cavity of the outer casing (100) in the axial direction are the air intake end and the air outlet end, respectively. The first end of the first guide groove (101) and the air intake channel (102) are both connected to the air intake end. Stator assembly (200), the stator assembly (200) is disposed in the inner cavity of the housing (100) and located between the air inlet end and the air outlet end, and the stator assembly (200) is partially arranged opposite to the first guide groove (101) along the radial direction of the stator assembly (200); Rotor assembly (300), which is rotatably disposed through the stator assembly (200); A shaft end cap (400) is disposed in the inner cavity of the housing (100) and connected to the stator assembly (200) and the housing (100). An air outlet channel (401) is provided on the shaft end cap (400), which connects the second end of the first guide groove (101) and the air outlet end.

2. The magnetic levitation bearing as described in claim 1, characterized in that, The stator assembly (200) includes: The yoke (210) has an annular structure. A portion of the circumferential outer wall of the yoke (210) is arranged opposite to the first guide groove (101), and the shaft end cap (400) abuts against the yoke (210). Multiple teeth (220) are spaced apart on the inner wall of the yoke (210) and extend radially along the yoke (210), and the rotor assembly (300) is rotatably passed through the central region surrounded by each of the teeth (220). Multiple stator windings (230) are wound one-to-one on each of the teeth (220); Multiple slot wedges (240) are disposed between two adjacent teeth (220) and abut against the side of the stator winding (230) opposite to the yoke (210).

3. The magnetic levitation bearing as described in claim 2, characterized in that, The slot wedge (240) and the rotor assembly (300) have a second guide groove (201), the two ends of the second guide groove (201) being connected to the air inlet end and the air outlet end, respectively.

4. The magnetic levitation bearing as described in claim 3, characterized in that, The middle position of the slot wedge (240) protrudes away from the rotor assembly (300) to form the second guide groove (201) with the rotor assembly (300).

5. The magnetic levitation bearing as described in claim 2, characterized in that, A third guide groove (202) is provided between two adjacent teeth (220), and the two ends of the third guide groove (202) are respectively connected to the air inlet end and the air outlet end.

6. The magnetic levitation bearing as described in claim 2, characterized in that, The groove wedge (240) and the tooth (220) are either an integral structure or a separate structure; And / or, the yoke (210) and the tooth (220) are either an integral structure or a separate structure.

7. The magnetic levitation bearing as described in claim 2, characterized in that, There are multiple first guide grooves (101), and along the radial direction of the yoke (210), the first guide grooves (101) and the teeth (220) are arranged in a one-to-one correspondence.

8. The magnetic levitation bearing as described in claim 7, characterized in that, The air intake channel (102) consists of multiple channels that are connected to the first guide channel (101) in a one-to-one correspondence.

9. The magnetic levitation bearing as described in claim 1, characterized in that, The shaft end cap (400) has an annular structure, and the air outlet channel (401) is disposed on the inner wall of the shaft end cap (400). The air outlet channel (401) gradually tilts towards the central axis of the stator assembly (200) from the air inlet end to the air outlet end.

10. The magnetic levitation bearing as described in claim 1, characterized in that, Along the direction from the air inlet to the air outlet, the inner wall of the outer shell (100) is provided with a first positioning step surface (103) and a second positioning step surface (104) at intervals. The first positioning step surface (103) and the second positioning step surface (104) are both annular structures arranged in the direction of the air outlet, and the outer diameter of the first positioning step surface (103) is equal to the inner diameter of the second positioning step surface (104). The end face of the first end of the stator assembly (200) abuts against the first positioning step surface (103), the outer ring side of the end face of the shaft end cap (400) is connected to the second positioning step surface (104), and the inner ring side of the end face of the shaft end cap (400) abuts against the end face of the second end of the stator assembly (200).

11. The magnetic levitation bearing as described in claim 10, characterized in that, Along the axial direction of the stator assembly (200), the stator assembly (200) protrudes 0.1mm-0.2mm from the second positioning step surface (104).

12. A magnetic levitation motor, characterized in that, Including the magnetic levitation bearing as described in any one of claims 1-11.

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