Axial electromagnetic bearing

Abstract

The invention discloses an axial electromagnetic bearing. The axial electromagnetic bearing comprises a rotor assembly and two stator assemblies, and the two stator assemblies are symmetrically arranged on the two sides of the thrust disc. Each stator assembly comprises a base, a plurality of silicon steel sheet lamination groups, a magnetic conductive ring and a coil. A plurality of mounting grooves are formed in the side, facing the base, of the magnetic conductive ring, the silicon steel sheet lamination sets are arranged in the mounting grooves in a one-to-one correspondence mode and clamped between the magnetic conductive ring and the base, and at least part of the magnetic conductive ring is located between the silicon steel sheet lamination sets and the thrust disc in the axial direction of the base. A coil is arranged in the magnetic conductive ring and the silicon steel sheet lamination group and used for generating a magnetic field. And eddy current on the stator assembly and the rotor assembly of the axial electromagnetic bearing is effectively reduced by utilizing the design that the silicon steel sheet lamination group is embedded in the mounting groove of the magnetic conductive ring, so that the power consumption of the axial electromagnetic bearing is reduced, the winding temperature rise is improved, and the dynamic performance of a system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electromagnetic bearings, and in particular to an axial electromagnetic bearing. Background Art

[0002] As a substitute for traditional rolling bearings and sliding bearings, electromagnetic bearings can achieve contactless support and zero friction loss. They are currently mainly used in high-speed rotating machinery, such as high-speed centrifugal compressors, high-speed turbine machinery, artificial hearts, satellite flywheels, etc. The common five-degree-of-freedom magnetic levitation rotor system is equipped with two radial bearings and one axial bearing. In order to reduce eddy current losses, the stator of the radial electromagnetic bearing is generally made of silicon steel sheet stacking. However, since the magnetic flux direction of the axial electromagnetic bearing is axial, it is not easy to use stacking to manufacture the stator of the axial electromagnetic bearing. At present, the stator and thrust plate of the axial electromagnetic bearing are generally made of low-carbon steel material through machining.

[0003] Due to the change in axial load and the ripple of the power amplifier output, induced eddy currents will be generated inside the axial electromagnetic bearing, which will cause problems such as heating and energy loss of the axial electromagnetic bearing, and will also reduce the dynamic performance of the electromagnetic bearing. Summary of the invention

[0004] The technical problem to be solved by the present application is how to provide an axial electromagnetic bearing with reduced eddy current effect and high dynamic performance.

[0005] An embodiment of the present application provides an axial electromagnetic bearing, comprising: a rotor assembly and two stator assemblies, the rotor assembly comprising a core shaft and a thrust plate, the two stator assemblies being symmetrically arranged on both sides of the thrust plate; each stator assembly comprising: a base, a plurality of silicon steel sheet lamination groups, a magnetic ring and a coil; the base is in a circular ring shape, the magnetic ring is coaxially fixed to one side of the base, a plurality of mounting grooves are provided on the side of the magnetic ring facing the base, the plurality of mounting grooves are arranged along the circumference of the base, a plurality of silicon steel sheet lamination groups are arranged in a one-to-one correspondence in the plurality of mounting grooves and are clamped between the magnetic ring and the base, a first groove is provided on the side of the magnetic ring facing away from the base, a second groove is provided on the side of each silicon steel sheet lamination group facing away from the base, the first groove cooperates with the second groove to form an annular groove, and the coil is arranged in the annular groove; in the axial direction of the base, at least part of the magnetic ring is located between the silicon steel sheet lamination group and the thrust plate.

[0006] In some embodiments, each silicon steel sheet stack includes a connecting portion and teeth located at both ends of the connecting portion in the radial direction of the base; in the axial direction of the base, at least part of the magnetic conductive ring is located between the teeth and the thrust plate.

[0007] In some embodiments, each silicon steel sheet stack includes a plurality of silicon steel sheets, and the plurality of silicon steel sheets are stacked along the circumference of the base.

[0008] In some embodiments, each tooth portion has a first end, a second end and a middle portion in the circumferential direction of the base, and the middle portion is located between the first end and the second end; the size of the silicon steel sheet of at least one tooth portion in the axial direction of the base gradually increases from the first end and the second end to the middle portion.

[0009] In some embodiments, between the first end and the middle portion, the surface of at least one tooth portion on the side away from the base in the axial direction of the base is a slope or a curved surface; between the second end and the middle portion, the surface of at least one tooth portion on the side away from the base in the axial direction of the base is a slope or a curved surface.

[0010] In some embodiments, each tooth portion has a first end and a second end in the circumferential direction of the base; the size of the silicon steel sheet of at least one tooth portion in the axial direction of the base gradually increases or decreases from the first end to the second end.

[0011] In some embodiments, between the first end and the second end, a surface of at least one tooth portion on a side away from the base in the axial direction of the base is an inclined surface or a curved surface.

[0012] In some embodiments, any two adjacent silicon steel sheets are connected by bonding or welding.

[0013] In some embodiments, the size of each silicon steel sheet in the circumferential direction of the base ranges from 0.1 mm to 1 mm.

[0014] In some embodiments, the stator assembly also includes a fastening male end and a fastening female end, a first fastening hole is provided on the base, a second fastening hole is provided on the magnetic ring, and the fastening male end passes through the first fastening hole and the second fastening hole and cooperates with the fastening female end to fix the magnetic ring and the base.

[0015] In some embodiments, the silicon steel sheet stack and the base are connected by bonding; the silicon steel sheet stack and the magnetic conductive ring are connected by bonding.

[0016] In some embodiments, a first clamping portion is provided on the side of the base facing the magnetic guide ring, and a second clamping portion is provided on the surface of the silicon steel sheet stack close to the base. The first clamping portion and the second clamping portion cooperate with each other to fix the base and the silicon steel sheet stack.

[0017] In some embodiments, when the silicon steel sheet stack is installed in the installation groove, the bottom of the first groove is flush with the bottom of the second groove.

[0018] In some embodiments, when the silicon steel sheet stack is installed in the installation groove, the surface of the silicon steel sheet stack close to the base is flush with the surface of the magnetic ring close to the base.

[0019] The axial electromagnetic bearing provided in the embodiment of the present application is provided with a plurality of mounting grooves on the side of the magnetic ring facing the base, and a plurality of silicon steel sheet lamination groups are arranged one by one in the plurality of mounting grooves and clamped between the magnetic ring and the base. The weak electrical conductivity of the silicon steel sheet lamination group in the circumferential direction of the base is utilized to effectively reduce the eddy currents on the stator assembly and the rotor assembly of the axial electromagnetic bearing, thereby reducing the power consumption of the axial electromagnetic bearing, improving the temperature rise phenomenon of the axial electromagnetic bearing, and improving the dynamic performance of the axial electromagnetic bearing.

[0020] In the embodiment of the present application, the axial size of the silicon steel sheet of at least one tooth portion of the base gradually increases from the first end and the second end to the middle portion, or the axial size of the silicon steel sheet of at least one tooth portion of the base gradually increases or decreases from the first end to the second end, thereby alleviating the phenomenon of uneven magnetic field on the surface of the magnetic ring close to the thrust plate, taking into account the magnetic conductivity and dynamic performance of the axial electromagnetic bearing, and ensuring the overall structural strength and rigidity of the axial electromagnetic bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 This is a schematic diagram of the structure of the axial electromagnetic bearing provided in Example 1 of the present application. Figure 1 ;

[0023] Figure 2 is an exploded view of the axial electromagnetic bearing provided in Example 1 of the present application;

[0024] Figure 3 is an exploded view of the stator assembly of the axial electromagnetic bearing provided in Example 1 of the present application;

[0025] Figure 4 This is a schematic diagram of the structure of the magnetic ring of the axial electromagnetic bearing provided in Example 1 of the present application. Figure 1 ;

[0026] Figure 5 It is a schematic structural diagram of a plurality of silicon steel sheet lamination groups of an axial electromagnetic bearing provided in Example 1 of the present application;

[0027] Figure 6 This is an exploded view of a silicon steel sheet stack of an axial electromagnetic bearing provided in Example 1 of the present application;

[0028] Figure 7 yes Figure 1 AA section view;

[0029] Figure 8 This is a schematic diagram of the structure of the axial electromagnetic bearing provided in Example 1 of the present application. Figure 2 ;

[0030] Fig. 9 yes Figure 8 BB cross-section diagram;

[0031] Fig.10 This is a schematic diagram of the structure of the axial electromagnetic bearing provided in Example 1 of the present application. Figure 3 ;

[0032] Fig.11 yes Fig.10 CC profile of ;

[0033] Fig.12 is a schematic structural diagram of an axial electromagnetic bearing provided in Example 2 of the present application;

[0034] Fig.13 is a schematic structural diagram of an axial electromagnetic bearing provided in Example 3 of the present application;

[0035] Fig.14 It is a schematic diagram of the structure of the axial electromagnetic bearing provided in Example 4 of the present application.

[0036] The markings in the figure are as follows:

[0037] 100. Axial electromagnetic bearing; 101. Stator assembly; 102. Rotor assembly;

[0038] 1. Base; 2. Silicon steel sheet stack; 3. Magnetic ring; 4. Coil; 5. Mandrel; 6. Thrust plate;

[0039] 11. First fastening hole;

[0040] 21, second groove; 22, silicon steel sheet; 201, connecting portion; 202, tooth portion; 2021, first end portion; 2022, second end portion; 2022, middle portion;

[0041] 31. Mounting groove; 32. First groove; 33. Second fastening hole. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present application are described in detail below in conjunction with the drawings in the specification, so as to fully introduce the technical content of the present application to those skilled in the art, to illustrate that the present application can be implemented, to make the technical content disclosed in the present application clearer, and to make it easier for those skilled in the art to understand how to implement the present application. However, the present application can be embodied through many different forms of embodiments, and the protection scope of the present application is not limited to the embodiments mentioned in the text, and the description of the embodiments below is not intended to limit the scope of the present application.

[0043] The directional terms mentioned in this application, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc., are only directions in the drawings. The directional terms used in this article are used to explain and illustrate this application, and are not used to limit the scope of protection of this application.

[0044] In the drawings, components with the same structure are represented by the same numerical labels, and components with similar structures or functions are represented by similar numerical labels. In addition, for the convenience of understanding and description, the size and thickness of each component shown in the drawings are arbitrarily shown, and the present application does not limit the size and thickness of each component.

[0045] Example 1

[0046] See also Figure 1 and Figure 2 The embodiment of the present application provides an axial electromagnetic bearing 100. The axial electromagnetic bearing 100 includes: a rotor assembly 102 and two stator assemblies 101. The rotor assembly 102 includes a core shaft 5 and a thrust plate 6. The two stator assemblies 101 are symmetrically arranged on both sides of the thrust plate 6.

[0047] See also Figure 1 and Figure 2 Each stator assembly 101 includes: a base 1, a plurality of silicon steel sheet stacks 2, a magnetic ring 3 and a coil 4.

[0048] See also Figure 1-Figure 3 The base 1 is in a circular shape, and the axial direction of the base 1 coincides with the axis of the core shaft 5 .

[0049] See also Figure 1-Figure 4 The magnetic ring 3 is coaxially fixed to one side of the base 1. The axes of the magnetic ring 3, the base 1 and the core shaft 5 coincide. The magnetic ring 3 has good magnetic conductivity and is made of soft magnetic material, such as electrical steel.

[0050] See also Figure 3 and Figure 4 The side of the magnetic conductive ring 3 facing the base 1 is provided with a plurality of mounting grooves 31, and the plurality of mounting grooves 31 are arranged along the circumference of the base 1. The side of the magnetic conductive ring 3 facing away from the base 1 is provided with a first groove 32.

[0051] See also Figure 1-Figure 3 , Figure 5 and Figure 6 , multiple silicon steel sheet stacks 2 are arranged in a plurality of mounting grooves 31 in a one-to-one correspondence and sandwiched between the magnetic ring 3 and the base 1. That is, a silicon steel sheet stack 2 is arranged in each mounting groove 31. A second groove 21 is arranged on the side of each silicon steel sheet stack 2 facing away from the base 1. The first groove 32 cooperates with the second groove 21 to form an annular groove.

[0052] See also Figure 1-Figure 3 , Figure 5 and Figure 6 In the axial direction of the base 1, at least part of the magnetic conductive ring 3 is located between the silicon steel sheet stack 2 and the thrust plate 6. Specifically, each silicon steel sheet stack 2 includes a connecting portion 201 and tooth portions 202 located at both ends of the connecting portion 201 in the radial direction of the base 1. In the axial direction of the base 1, at least part of the magnetic conductive ring 3 is located between the tooth portion 202 and the thrust plate 6.

[0053] See also Figure 6 , each silicon steel sheet stack 2 includes a plurality of silicon steel sheets 22, and the plurality of silicon steel sheets 22 are stacked along the circumference of the base 1. The axial electromagnetic bearing 100 in this embodiment includes 16 groups of silicon steel sheet stacks 2, and each silicon steel sheet stack 2 is composed of 40 silicon steel sheets 22 stacked. The size of the silicon steel sheet 22 in the circumferential direction of the base 1 ranges from 0.1 to 1 mm. In this embodiment, the size of the silicon steel sheet 22 in the circumferential direction of the base 1 is 0.5 mm, thereby improving the uneven distribution of the air gap magnetic field and reducing the eddy current effect of the thrust plate 6.

[0054] Among them, any two adjacent silicon steel sheets 22 are connected by bonding or welding. In this embodiment, any two adjacent silicon steel sheets 22 are connected by bonding, thereby preventing the silicon steel sheets 22 from warping. Furthermore, an insulating adhesive layer is used to bond any two adjacent silicon steel sheets 22, thereby utilizing the insulating adhesive layer to further reduce the electrical conductivity of the silicon steel sheet stack 2 in the circumferential direction of the base 1, thereby effectively reducing the eddy currents on the stator assembly 101 and the rotor assembly 102 of the axial electromagnetic bearing 100, thereby reducing the power consumption of the axial electromagnetic bearing 100, improving the temperature rise phenomenon of the axial electromagnetic bearing 100, and improving the dynamic performance of the axial electromagnetic bearing 100.

[0055] See also Figure 3 , the stator assembly 101 also includes a fastening male end (not shown) and a fastening female end (not shown). A first fastening hole 11 is provided on the base 1, and a second fastening hole 33 is provided on the magnetic ring 3. The fastening male end passes through the first fastening hole 11 and the second fastening hole 33 and cooperates with the fastening female end to fix the magnetic ring 3 and the base 1. In this embodiment, the fastening male end is preferably a bolt, and the fastening female end is preferably the magnetic ring 3. That is, the magnetic ring 3 is connected to the base 1 by bolts. Specifically, the bolt passes through the first fastening hole 11 and cooperates with the second fastening hole 33 to fix the magnetic ring 3 and the base 1, thereby sandwiching a plurality of silicon steel sheet lamination groups 2 between the magnetic ring 3 and the base 1, and is convenient for disassembly and assembly.

[0056] In other embodiments, the silicon steel sheet stack 2 and the base 1 are connected by bonding, that is, the silicon steel sheet stack 2 and the base 1 are further fixed by the adhesive layer to improve the connection stability between the silicon steel sheet stack 2 and the base 1.

[0057] In other embodiments, the silicon steel sheet stack 2 and the magnetic ring 3 are connected by bonding, that is, the silicon steel sheet stack 2 and the magnetic ring 3 are further fixed by the glue layer to improve the connection stability between the silicon steel sheet stack 2 and the magnetic ring 3.

[0058] In other embodiments, a first clamping portion is provided on the side of the base 1 facing the magnetic guide ring 3, and a second clamping portion is provided on the surface of the silicon steel sheet stack 2 close to the base 1, and the first clamping portion and the second clamping portion cooperate with each other to fix the base 1 and the silicon steel sheet stack 2. That is, the silicon steel sheet stack 2 and the base 1 are further fixed by the first clamping portion and the second clamping portion, thereby improving the connection stability between the silicon steel sheet stack 2 and the base 1.

[0059] See also Figure 1 and Figure 2 When the silicon steel sheet stack 2 is installed in the installation groove 31, the bottom of the first groove 32 is flush with the bottom of the second groove 21. In this way, the bottom of the annular groove formed by the first groove 32 and the second groove 21 can be flat, which is convenient for winding the wire harness in the annular groove to form the coil 4. Preferably, the coil 4 is sealed in the annular groove with insulating glue, and a magnetic field can be formed around the coil 4 when the coil 4 is energized.

[0060] See also Figure 1 and Figure 2 When the silicon steel sheet stack 2 is installed in the installation groove 31, the surface of the silicon steel sheet stack 2 close to the base 1 is flush with the surface of the magnetic ring 3 close to the base 1. Therefore, the surface of the silicon steel sheet stack 2 and the magnetic ring 3 after assembly close to the base 1 can be a plane, thereby improving the connection reliability of the silicon steel sheet stack 2, the magnetic ring 3 and the base 1.

[0061] See also Figures 1 to 3 , the coil 4 is arranged in the annular groove. The present application provides a plurality of mounting grooves 31 on the side of the magnetic ring 3 facing the base 1, and arranges a plurality of silicon steel sheet stacks 2 in the plurality of mounting grooves 31 in a one-to-one correspondence and clamps them between the magnetic ring 3 and the base 1. By utilizing the characteristic that the silicon steel sheet stacks 2 have weak electrical conductivity in the circumferential direction of the base 1, the eddy currents on the stator assembly 101 and the rotor assembly 102 of the axial electromagnetic bearing 100 are effectively reduced, thereby reducing the power consumption of the axial electromagnetic bearing 100 and improving the temperature rise phenomenon of the axial electromagnetic bearing 100.

[0062] It is worth noting that the thinnest part of the magnetic conductive ring 3 is 5 mm, and this size should be determined in combination with magnetic field analysis and structural modal analysis. The thinner this part is, the smaller the eddy current effect inside it is, but too thin will lead to uneven distribution of the air gap magnetic field, thereby increasing the eddy current in the thrust plate 6.

[0063] Due to the large difference in magnetic permeability between the magnetic ring 3 and the silicon steel sheet stack 2, there is a large difference between the magnetic field on the surface of the magnetic ring 3 on the side close to the thrust plate 6 at the position corresponding to the mounting groove 31 and the magnetic field on the position not corresponding to the mounting groove 31, causing the magnetic field on the surface of the magnetic ring 3 on the side close to the thrust plate 6 to fluctuate, that is, the magnetic field on the surface of the magnetic ring 3 on the side close to the thrust plate 6 is uneven.

[0064] See also Figure 1-Figure 3 , Figure 5 and Figure 6 Each tooth portion 202 has a first end portion 2021, a second end portion 2022 and a middle portion 2023 in the circumferential direction of the base 1, and the middle portion 2023 is located between the first end portion 2021 and the second end portion 2022. The size of the silicon steel sheet 22 of at least one tooth portion 202 in the axial direction of the base 1 gradually increases from the first end portion 2021 and the second end portion 2022 to the middle portion 2023. Among them, between the first end portion 2021 and the middle portion 2023, the surface of at least one tooth portion 202 on the side away from the base 1 in the axial direction of the base 1 is an inclined surface or a curved surface; between the second end portion 2022 and the middle portion 2023, the surface of at least one tooth portion 202 on the side away from the base 1 in the axial direction of the base 1 is an inclined surface or a curved surface.

[0065] See also Figure 1-Figure 3 , Figure 5 and Figure 6 In this embodiment, the size of the silicon steel sheet 22 of each tooth portion 202 in the axial direction of the base 1 gradually increases from the first end portion 2021 to the middle portion 2023. Between the first end portion 2021 and the middle portion 2023, the surface of each tooth portion 202 on the side away from the base 1 in the axial direction of the base 1 is an inclined surface.

[0066] See also Figure 1-Figure 3 , Figure 5 and Figure 6 In this embodiment, the size of the silicon steel sheet 22 of each tooth portion 202 in the axial direction of the base 1 gradually increases from the second end portion 2022 to the middle portion 2023. Between the second end portion 2022 and the middle portion 2023, the surface of each tooth portion 202 on the side away from the base 1 in the axial direction of the base 1 is an inclined surface.

[0067] See also Figure 7 The magnetic field D is the magnetic field of the surface of the magnetic ring 3 on the side close to the thrust plate 6 at the position of the magnetic ring 3 that does not correspond to the mounting groove 31, that is, the magnetic field D is the magnetic field of the surface of the magnetic ring 3 on the side close to the thrust plate 6 at the position where the magnetic ring 3 has the largest size in the axial direction of the base 1.

[0068] See also Figure 8 and Fig. 9The magnetic field E is the magnetic field of the surface of the magnetic ring 3 on the side close to the thrust plate 6 at a position where the size of the magnetic ring 3 in the axial direction of the base 1 is between the maximum and the minimum.

[0069] See also Fig.10 and Fig.11 The magnetic field F is the magnetic field of the surface of the magnetic conductive ring 3 on the side close to the thrust plate 6 at the position where the dimension of the magnetic conductive ring 3 in the axial direction of the base 1 is the smallest.

[0070] See also Figure 7 , Fig. 9 and Fig.11 In this embodiment, the silicon steel sheet 22 of the tooth portion 202 gradually changes in the axial direction of the base 1, thereby alleviating the uneven magnetic field on the surface of the magnetic ring 3 close to the thrust plate 6, taking into account the magnetic conductivity and dynamic performance of the axial electromagnetic bearing 100, and ensuring the overall structural strength and rigidity of the axial electromagnetic bearing 100.

[0071] Example 2

[0072] See also Fig.12 This embodiment includes most of the technical features of Example 1, and the difference between this embodiment and Example 1 is that: in this embodiment, the size of the silicon steel sheet 22 of each tooth portion 202 in the axial direction of the base 1 gradually increases from the first end portion 2021 to the middle portion 2023, and between the first end portion 2021 and the middle portion 2023, the surface of each tooth portion 202 on the side away from the base 1 in the axial direction of the base 1 is a curved surface; the size of the silicon steel sheet 22 of each tooth portion 202 in the axial direction of the base 1 gradually increases from the second end portion 2022 to the middle portion 2023, and between the second end portion 2022 and the middle portion 2023, the surface of each tooth portion 202 on the side away from the base 1 in the axial direction of the base 1 is a curved surface.

[0073] Example 3

[0074] See also Fig.13 This embodiment includes most of the technical features of the embodiment 1, and the difference between this embodiment and the embodiment 1 is that: in this embodiment, each tooth portion 202 has a first end portion 2021 and a second end portion 2022 in the circumferential direction of the base 1. The size of the silicon steel sheet 22 of at least one tooth portion 202 in the axial direction of the base 1 gradually increases from the first end portion 2021 to the second end portion 2022. Between the first end portion 2021 and the second end portion 2022, the surface of at least one tooth portion 202 on the side away from the base 1 in the axial direction of the base 1 is an inclined surface.

[0075] In other embodiments, the size of the silicon steel sheet 22 of at least one tooth portion 202 in the axial direction of the base 1 may also gradually decrease from the first end 2021 to the second end 2022 .

[0076] Example 4

[0077] See also Fig.14 This embodiment includes most of the technical features of the embodiment 1, and the difference between this embodiment and the embodiment 1 is that: in this embodiment, each tooth portion 202 has a first end portion 2021 and a second end portion 2022 in the circumferential direction of the base 1. The size of the silicon steel sheet 22 of at least one tooth portion 202 in the axial direction of the base 1 gradually increases from the first end portion 2021 to the second end portion 2022. Between the first end portion 2021 and the second end portion 2022, the surface of at least one tooth portion 202 on the side away from the base 1 in the axial direction of the base 1 is a curved surface.

[0078] In other embodiments, the size of the silicon steel sheet 22 of at least one tooth portion 202 in the axial direction of the base 1 may also gradually decrease from the first end 2021 to the second end 2022 .

[0079] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0080] The above is a detailed introduction to an axial electromagnetic bearing provided in an embodiment of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. An axial electromagnetic bearing, characterized in that: include: A rotor assembly (102) and two stator assemblies (101), wherein the rotor assembly (102) comprises a core shaft (5) and a thrust plate (6), and the two stator assemblies (101) are symmetrically arranged on both sides of the thrust plate (6); Each of the stator components (101) comprises: a base (1), a plurality of silicon steel sheet lamination groups (2), a magnetic conductive ring (3) and a coil (4); The base (1) is in the shape of a ring. The magnetic conductive ring (3) is coaxially fixed to one side of the base (1). A plurality of mounting grooves (31) are provided on the side of the magnetic conductive ring (3) facing the base (1). The plurality of mounting grooves (31) are arranged along the circumference of the base (1). The plurality of silicon steel sheet lamination groups (2) are arranged one by one in the plurality of mounting grooves (31) and are clamped between the magnetic conductive ring (3) and the base (1). A first groove (32) is provided on the side of the magnetic conductive ring (3) facing away from the base (1). A second groove (21) is provided on the side of each silicon steel sheet lamination group (2) facing away from the base (1). The first groove (32) cooperates with the second groove (21) to form an annular groove. The coil (4) is arranged in the annular groove. In the axial direction of the base (1), at least a portion of the magnetic conductive ring (3) is located between the silicon steel sheet stack (2) and the thrust plate (6).

2. The axial electromagnetic bearing according to claim 1, characterized in that: Each of the silicon steel sheet stacks (2) comprises a connecting portion (201) and tooth portions (202) located at two ends of the connecting portion (201) in the radial direction of the base (1); In the axial direction of the base (1), at least a portion of the magnetic conductive ring (3) is located between the tooth portion (202) and the thrust plate (6).

3. The axial electromagnetic bearing according to claim 2, characterized in that: Each silicon steel sheet stack (2) comprises a plurality of silicon steel sheets (22), and the plurality of silicon steel sheets (22) are stacked along the circumference of the base (1).

4. The axial electromagnetic bearing according to claim 3, characterized in that: Each of the tooth portions (202) has a first end portion (2021), a second end portion (2022) and a middle portion (2023) in the circumferential direction of the base (1), and the middle portion (2023) is located between the first end portion (2021) and the second end portion (2022); The dimensions of the silicon steel sheet (22) of at least one of the tooth portions (202) in the axial direction of the base (1) gradually increase from the first end portion (2021) and the second end portion (2022) to the middle portion (2023).

5. The axial electromagnetic bearing according to claim 4, characterized in that: Between the first end portion (2021) and the middle portion (2023), a surface of at least one of the tooth portions (202) on a side away from the base (1) in the axial direction of the base (1) is an inclined surface or a curved surface; Between the second end portion (2022) and the middle portion (2023), a surface of at least one of the tooth portions (202) on a side away from the base (1) in the axial direction of the base (1) is an inclined surface or a curved surface.

6. The axial electromagnetic bearing according to claim 3, characterized in that: Each of the tooth portions (202) has a first end portion (2021) and a second end portion (2022) in the circumferential direction of the base (1); The dimension of the silicon steel sheet (22) of at least one of the tooth portions (202) in the axial direction of the base (1) gradually increases or decreases from the first end (2021) to the second end (2022).

7. The axial electromagnetic bearing according to claim 6, characterized in that: Between the first end (2021) and the second end (2022), a surface of at least one of the tooth portions (202) on a side of the base (1) that is away from the base (1) in the axial direction is an inclined surface or a curved surface.

8. The axial electromagnetic bearing according to claim 3, characterized in that: Any two adjacent silicon steel sheets (22) are connected by bonding or welding.

9. The axial electromagnetic bearing according to claim 2, characterized in that: The size of each silicon steel sheet (22) in the circumferential direction of the base (1) ranges from 0.1 mm to 1 mm.

10. The axial electromagnetic bearing according to claim 1, characterized in that: The stator assembly further comprises a fastening male end and a fastening female end, the base (1) is provided with a first fastening hole (11), the magnetic conductive ring (3) is provided with a second fastening hole (33), the fastening male end passes through the first fastening hole (11) and the second fastening hole (33) and cooperates with the fastening female end to fix the magnetic conductive ring (3) and the base (1).

11. The axial electromagnetic bearing according to claim 1, characterized in that: The silicon steel sheet stack (2) and the base (1) are connected by bonding; The silicon steel sheet stack (2) and the magnetic conductive ring (3) are connected by bonding.

12. The axial electromagnetic bearing according to claim 1, characterized in that: A first clamping portion is provided on a side of the base (1) facing the magnetic conductive ring (3), and a second clamping portion is provided on a surface of the silicon steel sheet stack (2) close to the base (1), wherein the first clamping portion and the second clamping portion cooperate with each other to fix the base (1) and the silicon steel sheet stack (2).

13. The axial electromagnetic bearing according to claim 1, characterized in that: When the silicon steel sheet stack (2) is installed in the installation groove (31), the groove bottom of the first groove (32) is flush with the groove bottom of the second groove (21).

14. The axial electromagnetic bearing according to claim 11, characterized in that: When the silicon steel sheet stack (2) is installed in the installation groove (31), the surface of the silicon steel sheet stack (2) on the side close to the base (1) is flush with the surface of the magnetic conductive ring (3) on the side close to the base (1).

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