Magnetic suspension rotor assembly, magnetic suspension bearing assembly, motor and compressor

Abstract

The utility model discloses a magnetic suspension rotor assembly, a magnetic suspension bearing assembly, a motor and a compressor, and relates to the technical field of magnetic suspension parts, the magnetic suspension rotor assembly comprises a first rotor iron core, a second rotor iron core, a middle partition plate, a first baffle plate and a second baffle plate; the middle partition plate is arranged between the first rotor iron core and the second rotor iron core; the first baffle plate is arranged on one side, far away from the middle partition plate, of the first rotor iron core, and the second baffle plate is arranged on one side, far away from the middle partition plate, of the second rotor iron core. The magnetic suspension rotor assembly provided by the utility model can solve the problems of reduced magnetic conductivity and insufficient strength of a rotor iron core with a relatively long length.

Description

Technical Field

[0001] This utility model relates to the field of magnetic levitation components technology, and in particular to a magnetic levitation rotor assembly, a magnetic levitation bearing assembly, a motor and a compressor. Background Technology

[0002] In existing technologies, due to limitations in manufacturing tolerances of silicon steel laminations, precision constraints in the lamination process, and the lack of effective fixing measures between laminations, uneven air gaps exist between the laminations in long, laminated rotor cores. These air gaps not only significantly weaken the overall magnetic permeability of the rotor core, leading to uneven magnetic field distribution, increased eddy current losses, and reduced torque output and operating efficiency of the motor, but also cause relative sliding between the silicon steel laminations during high-speed rotation due to the lack of tight constraint. This results in a significant reduction in the overall strength of the rotor core, making it prone to lamination loosening and detachment, severely impacting the safety and stability of the magnetic levitation motor. Furthermore, as the length of the rotor core increases further, the problems of decreased magnetic permeability and insufficient strength caused by air gaps become increasingly severe, becoming a key technical bottleneck restricting the performance improvement and long-life operation of magnetic levitation motors. Utility Model Content

[0003] The main purpose of this invention is to propose a magnetic levitation rotor assembly, a magnetic levitation bearing assembly, a motor, and a compressor, aiming to solve the problems of decreased magnetic permeability and insufficient strength of long rotor cores.

[0004] To achieve the above objectives, the present invention proposes a magnetic levitation rotor assembly, which includes a first rotor core, a second rotor core, a partition plate, a first baffle plate, and a second baffle plate; the partition plate is disposed between the first rotor core and the second rotor core; the first baffle plate is disposed on the side of the first rotor core away from the partition plate, and the second baffle plate is disposed on the side of the second rotor core away from the partition plate.

[0005] In one embodiment, along the axial direction of the magnetic levitation rotor assembly, the thickness of the partition plate is not less than the thickness of the first rotor core and the second rotor core, and the thickness of the first baffle and the second baffle is less than the thickness of the first rotor core and the second rotor core.

[0006] In one embodiment, a support ring sleeve is further included, wherein the first baffle, the first rotor core, the middle partition, the second rotor core, and the second baffle are sleeved on the outer periphery of the support ring sleeve.

[0007] In one embodiment, the two end faces of the support ring are flush with the end faces of the first baffle and the second baffle.

[0008] This utility model also proposes a magnetic levitation bearing assembly, which includes a magnetic levitation rotor assembly. The magnetic levitation rotor assembly includes a first rotor core, a second rotor core, a partition plate, a first baffle plate, and a second baffle plate. The partition plate is disposed between the first rotor core and the second rotor core. The first baffle plate is disposed on the side of the first rotor core away from the partition plate, and the second baffle plate is disposed on the side of the second rotor core away from the partition plate. The magnetic levitation bearing assembly also includes a permanent magnet, a first stator assembly, and a second stator assembly. The first stator assembly is disposed on one side of the permanent magnet, and the second stator assembly is disposed on the other side of the permanent magnet. The first rotor core is disposed corresponding to the first stator assembly, and the second rotor core is disposed corresponding to the second stator assembly.

[0009] In one embodiment, the first stator assembly includes a first radial magnetic ring and a first stator core, the first stator core being mounted on the first radial magnetic ring; the second stator assembly includes a second radial magnetic ring and a second stator core, the second stator core being mounted on the second radial magnetic ring; wherein, along the axial direction of the rotor assembly, the width of the first rotor core is not less than the width of the first stator core, and the width of the second rotor core is not less than the width of the second stator core.

[0010] In one embodiment, the first stator assembly further includes a first control winding wound on the first stator core; the second stator assembly further includes a second control winding wound on the second stator core; wherein the first control winding and the second control winding are formed by a single coil.

[0011] In one embodiment, the first stator core is provided with a first wiring hole and a fourth wiring hole, and the second stator core is provided with a second wiring hole and a third wiring hole; in the axial direction of the stator core, the first wiring hole and the second wiring hole are correspondingly arranged, and the third wiring hole and the fourth wiring hole are correspondingly arranged, and the first wiring hole, the second wiring hole, the third wiring hole and the fourth wiring hole are used for coil wiring to wind and form the first control winding and the second control winding.

[0012] This utility model also proposes an electric motor, which includes a magnetic levitation bearing assembly, the magnetic levitation bearing assembly including a magnetic levitation rotor assembly, the magnetic levitation rotor assembly including a first rotor core, a second rotor core, a partition plate, a first baffle plate and a second baffle plate; the partition plate is disposed between the first rotor core and the second rotor core; the first baffle plate is disposed on the side of the first rotor core away from the partition plate, and the second baffle plate is disposed on the side of the second rotor core away from the partition plate; the magnetic levitation bearing assembly further includes a permanent magnet, a first stator assembly and a second stator assembly; the first stator assembly is disposed on one side of the permanent magnet; the second stator assembly is disposed on the other side of the permanent magnet; wherein, the first rotor core is disposed corresponding to the first stator assembly, and the second rotor core is disposed corresponding to the second stator assembly.

[0013] This utility model also proposes a compressor, which includes a magnetic levitation bearing assembly, the magnetic levitation bearing assembly including a magnetic levitation rotor assembly, the magnetic levitation rotor assembly including a first rotor core, a second rotor core, a partition plate, a first baffle plate and a second baffle plate; the partition plate is disposed between the first rotor core and the second rotor core; the first baffle plate is disposed on the side of the first rotor core away from the partition plate, and the second baffle plate is disposed on the side of the second rotor core away from the partition plate; the magnetic levitation bearing assembly further includes a permanent magnet, a first stator assembly and a second stator assembly; the first stator assembly is disposed on one side of the permanent magnet; the second stator assembly is disposed on the other side of the permanent magnet; wherein, the first rotor core is disposed corresponding to the first stator assembly, and the second rotor core is disposed corresponding to the second stator assembly.

[0014] The technical solution of this utility model, by setting the rotor core into a multi-segment structure, compared with the traditional long rotor core, the middle partition plate divides the long rotor core into multiple segments, shortening the length of a single segment. This reduces the accumulated gaps in the stacking of silicon steel laminations, improving magnetic permeability and structural strength. Furthermore, with the shortened length of a single segment, the pressure transmission path during stacking is shortened, resulting in more uniform compaction between laminations and avoiding the problem of "overpressure at both ends and looseness in the middle" in a long core. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1A schematic diagram of the structure of an embodiment of the magnetic levitation rotor assembly provided by this utility model;

[0017] Figure 2 A cross-sectional view of the magnetic levitation rotor assembly provided by this utility model;

[0018] Figure 3 Exploded view of an embodiment of the magnetic levitation bearing assembly provided by this utility model;

[0019] Figure 4 A cross-sectional view of the magnetic levitation bearing assembly provided by this utility model;

[0020] Figure 5 Left view of the magnetic levitation bearing assembly;

[0021] Figure 6 This is a right view of the magnetic levitation bearing assembly.

[0022] Explanation of icon numbers:

[0023] 100. Magnetic levitation bearing assembly; 10. Magnetic levitation rotor assembly; 11. First rotor core; 12. Second rotor core; 13. Middle partition; 14. First baffle; 15. Second baffle; 16. Support ring sleeve; 20. Permanent magnet; 30. First stator assembly; 31. First radial magnetic ring; 32. First stator core; 33. First control winding; 40. Second stator assembly; 41. Second radial magnetic ring; 42. Second stator core; 43. Second control winding; 51. First wiring hole; 52. Second wiring hole; 53. Third wiring hole; 54. Fourth wiring hole; 60. Positioning frame.

[0024] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0026] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0027] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0028] In existing technologies, due to limitations in manufacturing tolerances of silicon steel laminations, precision constraints in the lamination process, and the lack of effective fixing measures between laminations, uneven air gaps exist between the laminations in long, laminated rotor cores. These air gaps not only significantly weaken the overall magnetic permeability of the rotor core, leading to uneven magnetic field distribution, increased eddy current losses, and reduced torque output and operating efficiency of the motor, but also cause relative sliding between the silicon steel laminations during high-speed rotation due to the lack of tight constraint. This results in a significant reduction in the overall strength of the rotor core, making it prone to lamination loosening and detachment, severely impacting the safety and stability of the magnetic levitation motor. Furthermore, as the length of the rotor core increases further, the problems of decreased magnetic permeability and insufficient strength caused by air gaps become increasingly severe, becoming a key technical bottleneck restricting the performance improvement and long-life operation of magnetic levitation motors.

[0029] This invention proposes a magnetic levitation rotor assembly that divides the rotor core into multiple segments, thereby solving the problems of decreased magnetic permeability and insufficient strength in long rotor cores.

[0030] Please see Figure 1 and Figure 2 In one embodiment of the present invention, the magnetic levitation rotor assembly 10 includes a first rotor core 11, a second rotor core 12, a partition plate 13, a first baffle plate 14, and a second baffle plate 15; the partition plate 13 is disposed between the first rotor core 11 and the second rotor core 12; the first baffle plate 14 is disposed on the side of the first rotor core 11 away from the partition plate 13, and the second baffle plate 15 is disposed on the side of the second rotor core 12 away from the partition plate 13.

[0031] Specifically, the partition plate 13 is a circular metal plate, disposed between the first rotor core 11 and the second rotor core 12, for mechanical separation and axial positioning. The first rotor core 11, the partition plate 13, and the second rotor core 12 form a three-section structure. Compared to the traditional long rotor core, the partition plate 13 divides the long rotor core into two sections, shortening the length of a single core section. This reduces the accumulated gap during silicon steel lamination stacking, improving magnetic conductivity and structural strength. Furthermore, with the shortened length of a single core section, the pressure transmission path during stacking is shortened, resulting in more uniform compaction between laminations and avoiding the problem of "overpressure at both ends and looseness in the middle" in long cores.

[0032] The partition plate 13, acting as a mechanical separator, divides the long rotor core into two sections, halving the number of silicon steel laminations in a single core section and reducing the cumulative tolerance of lamination by 50%. Combined with the axial clamping of the first baffle plate 14 and the second baffle plate 15, this significantly reduces the air gap between laminations and improves the continuity of magnetic conductivity. Furthermore, the first baffle plate 14 and the second baffle plate 15 are fixed to both ends of the rotor core with an interference fit, forming a "clamp-like" constraint structure, which reduces the relative axial displacement between laminations during high-speed rotation. Moreover, the partition plate 13 divides the rotor core into independent left and right sections, corresponding to the control air gap of the dual stator assembly, allowing the bias magnetic field and control magnetic field to couple independently in the two core sections, avoiding the magnetic flux density caused by "a single magnetic circuit carrying the entire magnetic field" in traditional long cores.

[0033] The technical solution of this utility model, by setting the rotor core into a multi-segment structure, compared with the traditional long rotor core, the middle partition 13 divides the long rotor core into multiple segments, shortening the length of a single segment, thereby reducing the accumulated gap of silicon steel laminations and improving magnetic conductivity and structural strength. Furthermore, with the shortened length of a single segment, the pressure transmission path during lamination is shortened, resulting in more uniform compaction between laminations and avoiding the problem of "overpressure at both ends and looseness in the middle" in a long core.

[0034] Please see Figure 1 and Figure 2 In one embodiment, along the axial direction of the magnetic levitation rotor assembly 10, the thickness of the partition plate 13 is not less than the thickness of the first rotor core 11 and the second rotor core 12, and the thickness of the first baffle plate 14 and the second baffle plate 15 is less than the thickness of the first rotor core 11 and the second rotor core 12.

[0035] Specifically, the thickness of the partition plate 13 is greater than that of the first rotor core 11 and the second rotor core 12, forming an axial "reinforcing rib" structure that effectively suppresses axial deflection of the rotor assembly during high-speed rotation. The thick-walled partition plate 13 can withstand greater axial assembly pressure, ensuring that the two rotor core sections are tightly stacked and reducing the risk of loosening caused by gaps. The thickness of the first baffle plate 14 and the second baffle plate 15 is less than that of the first rotor core 11 and the second rotor core 12. While ensuring the axial limiting function, the overall rotational inertia of the rotor assembly is reduced. Furthermore, the thin baffle plate can absorb high-frequency vibration energy and suppress resonant coupling between the stator and the rotor.

[0036] Please see Figure 1 and Figure 2 In one embodiment, it further includes a support ring sleeve 16, wherein the first baffle 14, the first rotor core 11, the middle partition 13, the second rotor core 12 and the second baffle 15 are sleeved on the outer periphery of the support ring sleeve 16.

[0037] Specifically, the support ring 16 is a hollow cylindrical sleeve with an inner wall that is interference-fitted with the rotating shaft. The outer wall is fitted with a first baffle 14, a first rotor core 11, a middle partition 13, a second rotor core 12, and a second baffle 15. The length of the ring is equal to the total length of the rotor assembly, extending to the left end of the first baffle 14 and the right end of the second baffle 15, respectively. The support ring 16 runs through the entire rotor assembly, forming a rigid support frame that integrates the segmented rotor core, baffle, and middle partition 13 into a single unit. This significantly improves the overall strength and torsional stiffness of the rotor assembly. Furthermore, the support ring 16 structure provides a uniform axial pressure transmission path, ensuring uniform stress on the laminated laminations and preventing localized overpressure or loosening. The inner holes of the rotor core, middle partition 13, and baffles are all interference-fitted with the outer diameter of the support ring 16 and can be fixed using a heat-fitting process.

[0038] Please see Figure 1 and Figure 2 In one embodiment, the end faces of the support ring 16 are flush with the end faces of the first baffle 14 and the second baffle 15. Specifically, the flushness of the end faces of the support ring 16 with the end faces of the first baffle 14 and the second baffle 15 means that the outer circumferential surface of the support ring 16 is flush with the outer circumferential surface of the first baffle 14 and the second baffle 15, thereby forming a flat axial end face. The flush design facilitates the axial positioning and assembly of the rotor assembly and the stator assembly, ensures air gap uniformity, improves electromagnetic control accuracy, and eliminates airflow disturbances caused by protruding or recessed end faces, making it suitable for high-speed rotation scenarios.

[0039] Please see Figure 3 and Figure 4The present invention also proposes a magnetic levitation bearing assembly 100, which includes a magnetic levitation rotor assembly 10. The specific structure of the magnetic levitation rotor assembly 10 is as described in the above embodiments. Since the magnetic levitation bearing assembly 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0040] Furthermore, the magnetic levitation bearing assembly 100 also includes a permanent magnet 20, a first stator assembly 30, and a second stator assembly 40; the first stator assembly 30 is disposed on one side of the permanent magnet 20; the second stator assembly 40 is disposed on the other side of the permanent magnet 20; wherein, the first rotor core 11 is disposed corresponding to the first stator assembly 30, and the second rotor core 12 is disposed corresponding to the second stator assembly 40.

[0041] Specifically, the permanent magnet 20 can be made of neodymium iron boron (NdFeB) permanent magnet material, in the shape of a ring, magnetized circumferentially to provide a bias magnetic field. Alternatively, a positioning frame 60 can be provided, with the permanent magnet 20 arranged in multiple fan-shaped plates, and the permanent magnet 20 can be positioned and installed by the positioning frame 60. The first stator assembly 30 and the second stator assembly 40 are respectively arranged on both sides of the permanent magnet 20 along its axial direction.

[0042] The first stator assembly 30 is located to the left of the permanent magnet 20 and includes a radial magnetic ring and a stator core (made of laminated silicon steel). A control winding (enameled copper wire) is wound on the stator core. The second stator assembly 40 is symmetrically located to the right of the permanent magnet 20, with the same structure as the first stator assembly 30, forming a symmetrical double-stator layout through the permanent magnet 20. This symmetrical double-stator layout, in conjunction with the permanent magnet 20, ensures that the bias magnetic field is distributed inwards and outwards in the control air gaps on both sides, avoiding magnetic saturation in a single air gap and improving magnetic field utilization. The first rotor core 11 and the second rotor core 12 are both made of laminated silicon steel laminations and are distributed along the axial direction of the rotor shaft, corresponding to the first stator assembly 30 on the left and the second stator assembly 40 on the right, respectively.

[0043] Please see Figure 3 and Figure 4 In one embodiment, the first stator assembly 30 includes a first radial magnetic ring 31 and a first stator core 32, with the first stator core 32 mounted on the first radial magnetic ring 31; the second stator assembly 40 includes a second radial magnetic ring 41 and a second stator core 42, with the second stator core 42 mounted on the second radial magnetic ring 41; wherein, along the axial direction of the rotor assembly, the width of the first rotor core 11 is not less than the width of the first stator core 32, and the width of the second rotor core 12 is not less than the width of the second stator core 42.

[0044] This configuration ensures that the rotor core width covers the stator core, guaranteeing that the control magnetic field generated by the stator core and the bias magnetic field of the permanent magnet 20 completely pass through the effective magnetic conduction area of ​​the rotor core, thus avoiding magnetic field leakage at the edges due to the "excessive width" of the stator core. Furthermore, when the rotor core width is greater than the stator core width, the magnetic field energy is concentrated in the overlapping area of ​​the air gap and the rotor core, preventing a surge in local magnetic flux density at the stator core edges caused by abrupt changes in the magnetic circuit. Simultaneously, the wide rotor core design disperses the magnetic flux density, reducing the risk of local saturation and minimizing rotor heating.

[0045] Please see Figure 3 and Figure 4 In one embodiment, the first stator assembly 30 further includes a first control winding 33 wound on the first stator core 32; the second stator assembly 40 further includes a second control winding 43 wound on the second stator core 42; wherein the first control winding 33 and the second control winding 43 are formed by a single coil.

[0046] Specifically, the first control winding 33 and the second control winding 43 are made of the same enameled copper wire. The coil is first wound around the first stator core 32 (left side) to form the first control winding 33, and then wound through the winding hole to form the second stator core 42 (right side) to form the second control winding 43. The wires at both ends are concentrated on the same side of the first stator assembly 30.

[0047] The coils are wound with two wires in parallel or a single wire continuously, and the number of turns is designed according to the magnetic field requirements (e.g., 100-300 turns per phase). The windings are fixed in the stator core slots through an impregnation process (e.g., epoxy resin) to ensure insulation and mechanical strength. Sharing the coils reduces the number of windings, which can reduce copper losses and heat generation; furthermore, synchronous control of the dual stator windings further enhances the symmetry of magnetic field regulation and improves rotor levitation stability.

[0048] Please see Figures 3 to 6 In one embodiment, the first stator core 32 is provided with a first wiring hole 51 and a fourth wiring hole 54, and the second stator core 42 is provided with a second wiring hole 52 and a third wiring hole 53. In the axial direction of the stator core, the first wiring hole 51 and the second wiring hole 52 are correspondingly arranged, and the third wiring hole 53 and the fourth wiring hole 54 are correspondingly arranged. The first wiring hole 51, the second wiring hole 52, the third wiring hole 53 and the fourth wiring hole 54 are used for coil wiring to wind and form the first control winding 33 and the second control winding 43.

[0049] Furthermore, the first wiring hole 51 and the fourth wiring hole 54 are distributed on opposite sides of the center of the stator core; the coil is wound around the first stator core 32 to form the first control winding 33, and passes through the first wiring hole 51 and the second winding hole in sequence, and is wound around the second stator core 42 to form the second control winding 43, and passes through the third wiring hole 53 and the fourth wiring hole 54 in sequence to exit; wherein, the inlet side and the outlet side of the coil are located on the same side of the first stator assembly 30.

[0050] Specifically, the first stator core 32 has a first wiring hole 51 and a fourth wiring hole 54, symmetrically distributed along the center; the second stator core 42 has a corresponding second wiring hole 52 and a third wiring hole 53, axially aligned with the wiring holes of the first stator core 32. The inner walls of the wiring holes are smooth, and the edges are rounded to avoid scratching the coil insulation layer.

[0051] The specific wiring path is as follows: the coil enters from the left side of the first stator core 32, winds the first control winding 33, passes through the first wiring hole 51 → the second wiring hole 52 (across the air gap of the permanent magnet 20), winds the second control winding 43, then passes through the third wiring hole 53 → the fourth wiring hole 54 to exit, and finally exits from the same side as the wire entry side of the first stator assembly 30.

[0052] The symmetrical wiring hole design enables the coil to be wound in a "U" shape, shortening the span and reducing the magnetic field hysteresis effect; the centralized wiring scheme reduces the number of external connectors from 16 to 4, further reducing wiring complexity and cost, and improving assembly efficiency.

[0053] This utility model also proposes an electric motor, which includes the aforementioned magnetic levitation bearing assembly. The specific structure of the magnetic levitation bearing assembly is as described in the above embodiments. Since this electric motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0054] This utility model also proposes a compressor, which includes the aforementioned magnetic levitation bearing assembly. The specific structure of the magnetic levitation bearing assembly is as described in the above embodiments. Since this compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0055] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A magnetic levitation rotor assembly, characterized by, include: First rotor core and second rotor core; A partition plate is disposed between the first rotor core and the second rotor core; as well as A first baffle and a second baffle, wherein the first baffle is disposed on the side of the first rotor core away from the middle partition, and the second baffle is disposed on the side of the second rotor core away from the middle partition.

2. The magnetic levitation rotor assembly of claim 1, wherein, Along the axial direction of the magnetic levitation rotor assembly, the thickness of the partition plate is not less than the thickness of the first rotor core and the second rotor core, and the thickness of the first baffle and the second baffle is less than the thickness of the first rotor core and the second rotor core.

3. The magnetic bearing rotor assembly of claim 2 wherein, It also includes a support ring sleeve, and the first baffle, the first rotor core, the middle partition, the second rotor core and the second baffle are sleeved on the outer periphery of the support ring sleeve.

4. The magnetic bearing rotor assembly of claim 3 wherein, The two end faces of the support ring are flush with the end faces of the first baffle and the second baffle.

5. A magnetic bearing assembly, characterized by, include: The magnetic levitation rotor assembly as described in any one of claims 1 to 4; permanent magnet; The first stator assembly is disposed on one side of the permanent magnet; as well as The second stator assembly is disposed on the other side of the permanent magnet; The first rotor core is configured to correspond to the first stator assembly, and the second rotor core is configured to correspond to the second stator assembly.

6. The magnetic bearing assembly of claim 5, wherein, The first stator assembly includes a first radial magnetic ring and a first stator core, with the first stator core mounted on the first radial magnetic ring; the second stator assembly includes a second radial magnetic ring and a second stator core, with the second stator core mounted on the second radial magnetic ring; wherein, along the axial direction of the rotor assembly, the width of the first rotor core is not less than the width of the first stator core, and the width of the second rotor core is not less than the width of the second stator core.

7. The magnetic bearing assembly of claim 6 wherein, The first stator assembly further includes a first control winding wound on the first stator core; the second stator assembly further includes a second control winding wound on the second stator core; wherein the first control winding and the second control winding are formed by a single coil.

8. The magnetic bearing assembly of claim 7, wherein, The first stator core has a first wiring hole and a fourth wiring hole, and the second stator core has a second wiring hole and a third wiring hole. In the axial direction of the stator core, the first wiring hole and the second wiring hole are correspondingly arranged, and the third wiring hole and the fourth wiring hole are correspondingly arranged. The first wiring hole, the second wiring hole, the third wiring hole and the fourth wiring hole are used for coil wiring to wind and form the first control winding and the second control winding.

9. An electric machine characterized by Includes the magnetic levitation bearing assembly as described in any one of claims 5-8.

10. A compressor characterized by, Includes the magnetic levitation bearing assembly as described in any one of claims 5-8.

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