Magnetic levitation bearing assembly, motor and compressor

Abstract

The present invention provides a magnetic bearing assembly, motor, and compressor. By disposing a permanent magnet within an outer stator core, and disposing a first stator assembly and a second stator assembly on either side of the permanent magnet, and configuring the control magnetic fields generated by the stator assembly and the second stator assembly to be independently controlled, this arrangement enables the magnetic circuits generated by the first stator assembly and the second stator assembly to be complementary coupled, thereby simplifying the radial degree of freedom control logic and improving the stability and reliability of the radial control of the magnetic bearing assembly. This arrangement enables the magnetic bearing assembly to achieve multi-winding control of the radial and axial degrees of freedom of the rotating shaft, effectively avoiding the magnetic suspension system being in an uncontrolled state when a single winding control failure occurs, further improving the stability and reliability of the magnetic suspension system.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic bearings, and in particular to a magnetic bearing assembly, a motor and a compressor. Background Art

[0002] Magnetic bearings have a series of excellent qualities such as non-contact, wear-free, high speed, high precision, and no need for lubrication and sealing. They are high-tech products that integrate electromagnetism, electronic technology, control engineering, signal processing, and mechanics.

[0003] Magnetic bearings are categorized into three types: active, passive, and hybrid. Active magnetic bearings offer high stiffness and can be precisely controlled, but they require a large volume and consume a large amount of power to generate a specific unit of load capacity. Passive magnetic bearings utilize the attractive or repulsive forces between magnetic materials to levitate the rotor, resulting in relatively low stiffness and damping. Hybrid magnetic bearings use permanent magnets to provide a bias magnetic field, replacing the static bias magnetic field generated by electromagnets in active magnetic bearings. This reduces the ampere-turns of the control winding, shrinks the bearing size, and improves the bearing's load capacity. Hybrid magnetic bearings offer irreplaceable advantages in applications with strict requirements on volume and power consumption, and magnetic bearings are primarily used in high- and ultra-high-speed applications. Therefore, key research areas will be the integration and miniaturization of magnetic levitation systems and improving the stability and reliability of control systems.

[0004] To achieve contactless support for the rotor, the magnetic bearing system requires control of its five degrees of freedom in space. Traditional magnetic levitation structures use permanent magnet-biased front radial bearings and permanent magnet-biased rear radial bearings to control the rotor's four radial degrees of freedom, and permanent magnet-biased axial bearings to control the rotor's axial degrees of freedom. Two sets of permanent magnet-biased radial electromagnetic bearings and one set of permanent magnet-biased axial bearings achieve five degrees of freedom in the rotor's space. A bias magnetic field is generated by permanent magnets. A closed loop is formed by auxiliary stator poles, the shaft, and radial stator poles, creating a permanent magnet bias magnetic field. This bias magnetic flux is generated between the radial stator poles and the main air gap of the shaft. Control current is fed into radial horizontal and vertical control windings to generate a control magnetic field. This magnetic field, formed within the stator core and the shaft, regulates the bias magnetic flux between the radial stator poles and the main air gap of the shaft, achieving suspension control with two radial degrees of freedom. Among them, the permanent magnet generates a bias magnetic field, which forms a closed loop through the stator core and thrust plate at the left and right ends to form a bias magnetic field, forming a bias magnetic flux in the air gap between the left and right stator cores and thrust plates. The control winding is passed through a control current to form a control magnetic field, forming a closed loop through the stator core and thrust plate to form a control magnetic circuit, adjusting the bias magnetic flux in the stator core and thrust plate at the left and right ends to achieve axial suspension control of the rotating shaft. Each set of radial magnetic bearings controls the two radial degrees of freedom of the rotor, and the axial magnetic bearings control the axial translational degree of freedom of the rotor. There are two disadvantages in this magnetic suspension system structure:

[0005] 1. The two radial bearings and the axial bearing are placed side by side to increase the axial length of the rotor, increase the axial volume of the suspension system, and enhance the flexibility of the rotor.

[0006] 2. When the radial magnetic bearing performs radial horizontal and vertical control simultaneously, the radial two-degree-of-freedom control magnetic fields are coupled with each other, the control logic is complex, and the radial two-degree-of-freedom control winding is single. When a single winding fails, the control of the corresponding radial degree of freedom will fail, and the high-speed rotating shaft will cause serious safety hazards. The stability and reliability of the suspension system are low. Summary of the Invention

[0007] The main purpose of the present invention is to provide a magnetic suspension bearing assembly, a motor and a compressor to solve the problem of large axial length of the magnetic suspension bearing in the prior art.

[0008] To achieve the above-mentioned objectives, according to one aspect of the present invention, a magnetic bearing assembly is provided, comprising: an outer stator core, wherein a permanent magnet is disposed in the outer stator core; a first stator assembly, wherein the first stator assembly is disposed in the outer stator core and is located on a first side of the permanent magnet; a second stator assembly, wherein the second stator assembly is disposed in the outer stator core and is located on a second side of the permanent magnet, the first stator assembly and the second stator assembly being disposed opposite to each other; a rotor assembly, wherein the rotor assembly is disposed in the outer stator core, and the rotor assembly includes a rotating shaft; wherein the first stator assembly and the second stator assembly are used to generate independent control magnetic fields, the permanent magnet generates a bias magnetic field, and the control magnetic field is used to control the bias magnetic field to control the rotating shaft to perform translational motion along the Y axis, rotation around the Y axis, translational motion along the X axis, rotation around the X axis and / or translational motion along the Z axis, wherein the X axis and the Y axis are along the radial direction of the rotating shaft, and the Z axis is the axial direction of the rotating shaft.

[0009] Furthermore, the first stator assembly includes a first radial vertical stator assembly, which is arranged in the outer stator core and located on the first side of the permanent magnet; the second stator assembly includes a second radial vertical stator assembly, which is arranged in the outer stator core and located on the second side of the permanent magnet; the first radial vertical stator assembly and the second radial vertical stator assembly are arranged opposite to each other; wherein, the first radial vertical stator assembly and the second radial vertical stator assembly are used to generate independent radial vertical control magnetic fields.

[0010] Furthermore, the first radial vertical stator assembly includes: a first radial vertical stator, which is an annular structure, is arranged in the outer stator core and is located on the first side of the permanent magnet, and a first stator tooth is arranged on the inner circle of the first radial vertical stator; a first radial vertical winding, which is wound on the first stator tooth.

[0011] Furthermore, there are two first stator teeth, each of which is provided with a first radial vertical winding, and the two first stator teeth are arranged opposite to each other.

[0012] Furthermore, the first radial vertical stator assembly further includes: a first magnetic isolation ring, the first magnetic isolation ring is arranged in the outer stator core, and the first magnetic isolation ring is sleeved on the outer circumferential surface of the first radial vertical stator.

[0013] Furthermore, the second radial vertical stator assembly includes: a second radial vertical stator, which is an annular structure, is arranged in the outer stator core and is located on the second side of the permanent magnet, and second stator teeth are arranged on the inner circle of the second radial vertical stator; a second radial vertical winding, which is wound on the second stator teeth.

[0014] Furthermore, there are two second stator teeth, each second stator tooth is provided with a second radial vertical winding, and the two second stator teeth are arranged opposite to each other.

[0015] Furthermore, the second radial vertical stator assembly further includes: a second magnetic isolation ring, the second magnetic isolation ring is arranged in the outer stator core, and the second magnetic isolation ring is sleeved on the outer circumferential surface of the second radial vertical stator.

[0016] Furthermore, the first stator assembly includes a first radial horizontal stator assembly, which is arranged in the first end of the outer stator core and located on the outside of the first radial vertical stator assembly; the second stator assembly includes a second radial horizontal stator assembly, which is arranged in the second end of the outer stator core and located on the outside of the second radial vertical stator assembly; wherein the first radial horizontal stator assembly and the second radial horizontal stator assembly are used to generate independent radial horizontal control magnetic fields.

[0017] Furthermore, the first radial horizontal stator assembly includes: a first radial horizontal stator, which is an annular structure, is arranged in the first end of the outer stator core and is located on the outside of the axial direction of the first radial vertical stator assembly, and a third stator tooth is arranged on the inner circle of the first radial horizontal stator; a first radial horizontal winding, which is wound on the third stator tooth.

[0018] Furthermore, there are two third stator teeth, and the two third stator teeth are arranged opposite to each other.

[0019] Furthermore, a geometric center line of the third stator tooth along the first radial direction and a geometric center line of the first stator tooth along the first radial direction are arranged perpendicular to each other.

[0020] Furthermore, the second radial horizontal stator assembly includes: a second radial horizontal stator, which is an annular structure, is arranged in the second end of the outer stator core and is located on the outside of the second radial vertical stator assembly in the axial direction, and a fourth stator tooth is arranged on the inner circle of the second radial horizontal stator; a second radial horizontal winding, which is wound on the fourth stator tooth.

[0021] Furthermore, there are two fourth stator teeth, and the two fourth stator teeth are arranged opposite to each other.

[0022] Furthermore, a horizontal stator geometric center line of the fourth stator tooth along the second radial direction is arranged perpendicular to a vertical stator geometric center line of the second stator tooth along the second radial direction.

[0023] Furthermore, the rotor assembly includes: a radial vertical rotor, a first radial vertical stator, an outer stator iron core and an inner circle of a second radial vertical stator for installing the radial vertical rotor, the radial vertical rotor is arranged in coordination with the first radial vertical stator, the outer stator iron core and the second radial vertical stator, and the rotating shaft is passed through the radial vertical rotor.

[0024] Furthermore, the rotor assembly also includes: a first radial horizontal rotor, which is arranged in the first end of the outer stator iron core and is located on the outside of the first radial horizontal stator in the axial direction, and the first radial horizontal rotor is arranged in cooperation with the first radial horizontal stator; a second radial horizontal rotor, which is arranged in the second end of the outer stator iron core and is located on the outside of the second radial horizontal stator in the axial direction, and the second radial horizontal rotor is arranged in cooperation with the second radial horizontal stator, and the rotating shaft is passed through the first radial horizontal rotor and the second radial horizontal rotor.

[0025] Further, the diameter of the cross section of at least one of the first radial horizontal rotor and the second radial horizontal rotor is arranged to gradually increase outward along the direction of the rotation axis.

[0026] Furthermore, an annular boss is provided in the middle of the outer stator core, and the outer peripheral surface of the permanent magnet is attached to the inner circle of the annular boss. The side of the permanent magnet facing the outer surface of the outer stator core is the N pole, and the side of the permanent magnet facing the rotating shaft is the S pole.

[0027] Furthermore, the height of the annular boss in the axial direction is the same as the height of the permanent magnet in the axial direction.

[0028] Furthermore, a first annular step is provided inside the first end of the outer stator core, and an installation space for accommodating the first radial horizontal stator assembly is formed between the step surface of the first annular step and the end of the outer stator core, and an installation space for accommodating the first radial vertical stator assembly is formed between the step surface of the first annular step and one side of the annular boss.

[0029] Furthermore, a second annular step is provided inside the second end of the outer stator core, and an installation space for accommodating the second radial horizontal stator assembly is formed between the step surface of the second annular step and the end of the outer stator core, and an installation space for accommodating the second radial vertical stator assembly is formed between the step surface of the second annular step and one side of the annular boss.

[0030] Further, the first radial vertical stator has a plurality of first stator teeth, each first stator tooth is provided with a first radial vertical winding, each first radial vertical winding is independently controlled so that each first radial vertical winding generates an independent radial vertical control magnetic field, and / or the second radial vertical stator has a plurality of second stator teeth, each second stator tooth is provided with a second radial vertical winding, each second radial vertical winding is independently controlled so that each second radial vertical winding generates an independent radial vertical control magnetic field, and / or the first radial horizontal stator has a plurality of third stator teeth, each third stator tooth is provided with a first radial horizontal winding, each first radial horizontal winding is independently controlled so that each first radial horizontal winding generates an independent radial horizontal control magnetic field, and / or the second radial horizontal stator has a plurality of fourth stator teeth, each fourth stator tooth is provided with a second radial horizontal winding, each second radial horizontal winding is independently controlled so that each second radial horizontal winding generates an independent radial horizontal control magnetic field.

[0031] According to another aspect of the present invention, a motor is provided, comprising a magnetic bearing assembly, wherein the magnetic bearing assembly is the magnetic bearing assembly described above.

[0032] According to another aspect of the present invention, a compressor is provided, comprising a magnetic bearing assembly, wherein the magnetic bearing assembly is the magnetic bearing assembly described above.

[0033] The technical solution of the present invention incorporates a permanent magnet within the outer stator core, and positions a first stator assembly and a second stator assembly on either side of the permanent magnet. The control magnetic fields generated by the stator assembly and the second stator assembly are configured to be independently controlled. This arrangement enables complementary coupling of the magnetic circuits generated by the first and second stator assemblies, simplifying the radial degree of freedom control logic and improving the stability and reliability of the radial control of the magnetic bearing assembly. This arrangement enables the magnetic bearing assembly to achieve multi-winding control of the radial and axial degrees of freedom of the rotating shaft, effectively preventing the magnetic suspension system from being left uncontrolled in the event of a single winding control failure, further improving the stability and reliability of the magnetic suspension system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0035] Figure 1 A schematic structural diagram of a first embodiment of a magnetic bearing assembly according to the present invention is shown;

[0036] Figure 2 A schematic diagram showing a radial vertical control magnetic field of a magnetic bearing assembly according to the present invention is shown;

[0037] Figure 3 A schematic structural diagram of a second embodiment of a magnetic bearing assembly according to the present invention is shown;

[0038] Figure 4 A schematic diagram showing a radial horizontal magnetic field control of a magnetic bearing assembly according to the present invention is shown;

[0039] Figure 5 shows a structural schematic diagram of a third embodiment of a magnetic bearing assembly according to the present invention;

[0040] Figure 6 A schematic diagram of an exploded structure of an embodiment of a magnetic bearing assembly according to the present invention is shown;

[0041] Figure 7 A schematic structural diagram of an embodiment of a rotor assembly of a magnetic bearing assembly according to the present invention is shown;

[0042] Figure 8 A schematic cross-sectional view of an embodiment of a magnetic bearing assembly according to the present invention is shown;

[0043] Figure 9 A schematic structural diagram of an embodiment of a rotating shaft of a magnetic bearing assembly according to the present invention is shown;

[0044] Figure 10 A schematic diagram showing a force analysis of a rotating shaft of a magnetic bearing assembly according to the present invention in a first state is shown;

[0045] Figure 11 A schematic diagram of force analysis of the rotating shaft of the magnetic bearing assembly according to the present invention in the second state is shown;

[0046] Figure 12 A schematic diagram of force analysis of the rotating shaft of the magnetic bearing assembly according to the present invention in the third state is shown;

[0047] Figure 13 A schematic diagram of force analysis of the rotating shaft of the magnetic bearing assembly according to the present invention in a fourth state is shown;

[0048] Figure 14 shows a structural schematic diagram of a fourth embodiment of a magnetic bearing assembly according to the present invention;

[0049] Figure 15Shown Figure 14 Schematic diagram of the cross-sectional structure along the AA direction;

[0050] Figure 16 shows a structural schematic diagram of a fifth embodiment of a magnetic bearing assembly according to the present invention;

[0051] Figure 17 A structural schematic diagram of a fifth embodiment of a magnetic bearing assembly according to the present invention is shown.

[0052] The above drawings include the following reference numerals:

[0053] 10. External stator core;

[0054] 11. Permanent magnet; 12. Annular boss; 13. First annular step; 14. Second annular step; 15. First annular protrusion; 16. Second annular protrusion;

[0055] 20. A first radial vertical stator assembly;

[0056] 21. First radial vertical stator; 211. First stator tooth;

[0057] 22. First radial vertical winding; 23. First magnetic isolation ring;

[0058] 30. A second radial vertical stator assembly;

[0059] 31. Second radial vertical stator; 311. Second stator tooth;

[0060] 32. Second radial vertical winding; 33. Second magnetic isolation ring;

[0061] 40. Rotor assembly;

[0062] 41. Rotating shaft; 42. Radial vertical rotor; 43. First radial horizontal rotor; 44. Second radial horizontal rotor;

[0063] 50. A first radial horizontal stator assembly;

[0064] 51. First radial horizontal stator; 511. Third stator tooth; 52. First radial horizontal winding;

[0065] 60. A second radial horizontal stator assembly;

[0066] 61. Second radial horizontal stator; 611. Fourth stator tooth; 62. Second radial horizontal winding;

[0067] 70. Precision nuts;

[0068] 80. First magnetic conductive ring;

[0069] 90. Second magnetic ring. DETAILED DESCRIPTION

[0070] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0071] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0072] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0073] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0074] Combine Figures 1 to 13 As shown, according to a specific embodiment of the present application, a magnetic bearing assembly is provided.

[0075] Specifically, the magnetic bearing assembly includes an outer stator core 10, a first stator assembly, a second stator assembly, and a rotor assembly 40. A permanent magnet 11 is disposed in the outer stator core 10. The first stator assembly is disposed in the outer stator core 10 and is located on a first side of the permanent magnet 11. The second stator assembly is disposed in the outer stator core 10 and is located on a second side of the permanent magnet 11, with the first stator assembly and the second stator assembly being disposed opposite each other. The rotor assembly 40 is disposed in the outer stator core 10 and includes a rotating shaft 41. The first stator assembly and the second stator assembly are used to generate independent control magnetic fields, the permanent magnet 11 generates a bias magnetic field, and the control magnetic field is used to control the bias magnetic field to control the rotating shaft 41 to perform translational motion along the Y axis, rotation around the Y axis, translational motion along the X axis, rotation around the X axis, and / or translational motion along the Z axis. The X axis and the Y axis are radial directions of the rotating shaft 41, and the Z axis is the axial direction of the rotating shaft 41.

[0076] In this embodiment, a permanent magnet is disposed within the outer stator core, and a first stator assembly and a second stator assembly are positioned on either side of the permanent magnet. The control magnetic fields generated by the stator and second stator assemblies are independently controlled. This arrangement enables complementary coupling of the magnetic circuits generated by the first and second stator assemblies, simplifying the radial degree of freedom control logic and improving the stability and reliability of the radial control of the magnetic bearing assembly. This arrangement enables the magnetic bearing assembly to achieve multi-winding control of the radial and axial degrees of freedom of the rotating shaft, effectively preventing the magnetic suspension system from being left uncontrolled in the event of a single winding control failure, further improving the stability and reliability of the magnetic suspension system.

[0077] Furthermore, the first stator assembly includes a first radial vertical stator assembly 20. The first radial vertical stator assembly 20 is disposed in the outer stator core 10 and is located on a first side of the permanent magnet 11. The second stator assembly includes a second radial vertical stator assembly 30. The second radial vertical stator assembly 30 is disposed in the outer stator core 10 and is located on a second side of the permanent magnet 11, and the first radial vertical stator assembly 20 and the second radial vertical stator assembly 30 are disposed opposite each other; the rotor assembly 40 is disposed in the outer stator core 10, and the rotor assembly 40 includes a rotating shaft 41; wherein the first radial vertical stator assembly 20 and the second radial vertical stator assembly 30 are used to generate independent radial vertical control magnetic fields.

[0078] In this embodiment, a permanent magnet 11 is disposed within the outer stator core 10, and a first radial vertical stator assembly 20 and a second radial vertical stator assembly 30 are disposed on either side of the permanent magnet 11. The radial vertical control magnetic fields generated by the first radial vertical stator assembly 20 and the second radial vertical stator assembly 30 are independent. This arrangement enables the magnetic circuits generated by the first radial vertical stator assembly 20 and the second radial vertical stator assembly 30 to be complementary coupled, thereby simplifying the radial degree of freedom control logic and improving the stability and reliability of the radial control of the magnetic levitation bearing assembly. This arrangement enables the magnetic levitation bearing assembly to achieve multi-winding control of the radial and axial degrees of freedom of the rotating shaft 41, effectively avoiding the magnetic levitation system being in an uncontrolled state when a single winding control failure occurs, further improving the stability and reliability of the magnetic levitation system.

[0079] like Figure 1 and Figure 6 As shown, the first radial vertical stator assembly 20 includes a first radial vertical stator 21 and a first radial vertical winding 22. The first radial vertical stator 21 is an annular structure. The first radial vertical stator 21 is arranged in the outer stator core 10 and is located on the first side of the permanent magnet 11. The first stator teeth 211 are arranged on the inner circle of the first radial vertical stator 21. The first radial vertical winding 22 is wound on the first stator teeth 211. There are two first stator teeth 211, and each first stator tooth 211 is provided with a first radial vertical winding 22. The two first stator teeth 211 are arranged opposite to each other. This arrangement can effectively improve the performance of the first radial vertical stator assembly 20. Of course, the number of first stator teeth 211 can also be set to other numbers as needed.

[0080] like Figure 1 As shown, the first radial vertical stator assembly 20 further includes a first magnetic isolation ring 23. The first magnetic isolation ring 23 is disposed within the outer stator core 10 and sleeved onto the outer circumferential surface of the first radial vertical stator 21. This arrangement prevents magnetic flux leakage between the first radial vertical stator 21 and the outer stator core 10 from affecting the strength of the radial bias magnetic field C1.

[0081] Furthermore, the second radial vertical stator assembly 30 includes a second radial vertical stator 31 and a second radial vertical winding 32. The second radial vertical stator 31 is an annular structure, and the second radial vertical stator 31 is arranged in the outer stator core 10 and is located on the second side of the permanent magnet 11. The second radial vertical stator 31 is coaxially arranged with the first radial vertical stator 21, and a second stator tooth 311 is arranged on the inner circle of the second radial vertical stator 31. The second radial vertical winding 32 is wound on the second stator teeth 311. There are two second stator teeth 311, and each second stator tooth 311 is provided with a second radial vertical winding 32, and the two second stator teeth 311 are arranged opposite to each other. Such an arrangement can effectively improve the performance of the second radial vertical stator assembly 30. The number of second stator teeth 311 is not limited to two.

[0082] To further enhance the strength of the radial bias magnetic field C1 , the second radial vertical stator assembly 30 further includes a second magnetic isolation ring 33 . The second magnetic isolation ring 33 is disposed within the outer stator core 10 and sleeved on the outer circumference of the second radial vertical stator 31 .

[0083] like Figure 3 As shown, the first stator assembly further includes a first radial horizontal stator assembly 50. The second stator assembly includes a second radial horizontal stator assembly 60. The first radial horizontal stator assembly 50 is disposed within the first end of the outer stator core 10 and is located outside the first radial vertical stator assembly 20. The second radial horizontal stator assembly 60 is disposed within the second end of the outer stator core 10 and is located outside the second radial vertical stator assembly 30. The first radial horizontal stator assembly 50 and the second radial horizontal stator assembly 60 are used to generate independent radial horizontal control magnetic fields. The permanent magnet 11 generates a bias magnetic field. The control magnetic field is used to control the bias magnetic field to control the translational motion of the rotating shaft 41 along the X-axis or Z-axis, or to control the rotation of the rotating shaft 41 about the Y-axis. That is, in this embodiment, the combination of the outer stator core 10, the permanent magnet 11, the first radial vertical stator assembly 20, the second radial vertical stator assembly 30, and the rotor assembly 40 enables five-degree-of-freedom control of the rotating shaft 41, effectively improving the stability and reliability of the rotating shaft 41.

[0084] Specifically, the first radial horizontal stator assembly 50 includes a first radial horizontal stator 51 and a first radial horizontal winding 52. The first radial horizontal stator 51 is an annular structure, disposed within the first end of the outer stator core 10 and located axially outward of the first radial vertical stator assembly 20. Third stator teeth 511 are disposed on the inner circumference of the first radial horizontal stator 51. The first radial horizontal winding 52 is wound around the third stator teeth 511. There are two third stator teeth 511, which are disposed opposite each other. Of course, the number of third stator teeth 511 can also be set to more than two.

[0085] Preferably, the geometric centerline of the third stator tooth 511 along the first radial direction of the horizontal stator 51 is arranged perpendicular to the geometric centerline of the first stator tooth 211 along the first radial direction of the vertical stator 21. This arrangement allows the first stator tooth 211 and the third stator tooth 511 to be staggered in the axial direction of the rotating shaft 41. This arrangement can promptly correct the suspended state of the rotating shaft 41 by adjusting the magnetic flux intensity of the magnetic circuit formed by the first stator tooth 211 and the third stator tooth 511, further improving the stability of the rotating shaft 41 during rotation.

[0086] The second radial horizontal stator assembly 60 includes a second radial horizontal stator 61 and a second radial horizontal winding 62. The second radial horizontal stator 61 is an annular structure. The second radial horizontal stator 61 is arranged inside the second end of the outer stator core 10 and is located outside the axial direction of the second radial vertical stator assembly 30. Fourth stator teeth 611 are arranged on the inner circle of the second radial horizontal stator 61. The second radial horizontal winding 62 is wound around the fourth stator teeth 611. There are two fourth stator teeth 611, and the two fourth stator teeth 611 are arranged opposite to each other. In this embodiment, the fourth stator teeth 611 can also be arranged in other numbers.

[0087] Preferably, the geometric centerline of the fourth stator tooth 611 along the second radial direction of the horizontal stator 61 is arranged perpendicular to the geometric centerline of the second stator tooth 311 along the second radial direction of the vertical stator 31. This arrangement allows the second stator tooth 311 and the fourth stator tooth 611 to be staggered in the axial direction of the rotating shaft 41. This arrangement can promptly correct the suspended state of the rotating shaft 41 by adjusting the magnetic flux intensity of the magnetic circuit formed by the second stator tooth 311 and the fourth stator tooth 611, further improving the stability of the rotating shaft 41 during rotation.

[0088] like Figure 7 As shown, the rotor assembly 40 includes a radial vertical rotor 42. The inner circumference of the first radial vertical stator 21, the outer stator core 10, and the second radial vertical stator 31 is formed for mounting the radial vertical rotor 42. The radial vertical rotor 42 is arranged in coordination with the first radial vertical stator 21, the outer stator core 10, and the second radial vertical stator 31, and the rotating shaft 41 is disposed within the radial vertical rotor 42. This arrangement can improve the stability and reliability of the magnetic bearing assembly.

[0089] Furthermore, the rotor assembly 40 also includes a first radial horizontal rotor 43 and a second radial horizontal rotor 44. The first radial horizontal rotor 43 is disposed within the first end of the outer stator core 10 and is located axially outward of the first radial horizontal stator 51. The first radial horizontal rotor 43 is configured to cooperate with the first radial horizontal stator 51. The second radial horizontal rotor 44 is disposed within the second end of the outer stator core 10 and is located axially outward of the second radial horizontal stator 61. The second radial horizontal rotor 44 is configured to cooperate with the second radial horizontal stator 61, and the rotating shaft 41 is disposed within the first radial horizontal rotor 43 and the second radial horizontal rotor 44. The ends of the rotating shaft 41 are locked with precision nuts.

[0090] The diameter of the cross section of at least one of the first radial horizontal rotor 43 and the second radial horizontal rotor 44 is gradually increased outward along the direction of the rotation shaft 41. Figure 7 As shown, the first radial horizontal rotor 43 and the second radial horizontal rotor 44 are both frustum structures. This arrangement enables an air gap structure with an inclination angle to the axial direction of the rotating shaft to be formed between the first radial horizontal rotor 43, the second radial horizontal rotor 44 and the first radial horizontal stator 51, the second radial horizontal stator 61. This arrangement can control the axial direction of the rotating shaft 41 by controlling the magnitude of the current passed through the first radial horizontal winding 52 and the second radial horizontal winding 62, thereby effectively improving the practicality of the magnetic levitation bearing.

[0091] like Figure 5 As shown, in another embodiment of the present application, the first radial horizontal rotor 43 and the second radial horizontal rotor 44 are equal-diameter structures, and an air gap structure with equal distance along the axial direction is formed between the first radial horizontal rotor 43 and the second radial horizontal rotor 44 and the first radial horizontal stator 51 and the second radial horizontal stator 61.

[0092] Preferably, the first radial horizontal stator 51, the second radial horizontal stator 61 and the outer stator core 10 are integrally formed. This arrangement can further improve the stability of the magnetic bearing assembly.

[0093] Furthermore, an annular boss 12 is provided in the middle of the outer stator core 10. The outer circumference of the permanent magnet 11 is attached to the inner circumference of the annular boss 12. The side of the permanent magnet 11 facing the outer surface of the outer stator core 10 is the north pole, and the side of the permanent magnet 11 facing the rotating shaft 41 is the south pole. This arrangement enables the permanent magnet 11 to cooperate with the first radial horizontal winding 52 and the second radial horizontal winding 62 to form a radial horizontal bias magnetic field C5 for controlling the rotating shaft 41.

[0094] The height of the annular boss 12 in the axial direction is the same as the height of the permanent magnet 11 in the axial direction. This arrangement can improve the installation stability of the permanent magnet 11.

[0095] like Figure 6 and Figure 8 As shown, a first annular step 13 is provided in the first end of the outer stator core 10. An installation space for accommodating the first radial horizontal stator assembly 50 is formed between the step surface of the first annular step 13 and the end of the outer stator core 10. An installation space for accommodating the first radial vertical stator assembly 20 is formed between the step surface of the first annular step 13 and the side of the annular boss 12. A second annular step 14 is provided in the second end of the outer stator core 10. An installation space for accommodating the second radial horizontal stator assembly 60 is formed between the step surface of the second annular step 14 and the end of the outer stator core 10. An installation space for accommodating the second radial vertical stator assembly 30 is formed between the step surface of the second annular step 14 and the side of the annular boss 12. This arrangement can make the structure of the magnetic bearing assembly more compact and can effectively shorten the axial height of the magnetic bearing assembly.

[0096] Furthermore, the first radial vertical stator 21 has a plurality of first stator teeth 211. Each first stator tooth 211 is provided with a first radial vertical winding 22, and each first radial vertical winding 22 is independently controlled so that each first radial vertical winding 22 generates an independent radial vertical control magnetic field. The second radial vertical stator 31 has a plurality of second stator teeth 311, and each second stator tooth 311 is provided with a second radial vertical winding 32. Each second radial vertical winding 32 is independently controlled so that each second radial vertical winding 32 generates an independent radial vertical control magnetic field. The first radial horizontal stator 51 has a plurality of third stator teeth 511, and each third stator tooth 511 is provided with a first radial horizontal winding 52. Each first radial horizontal winding 52 is independently controlled so that each first radial horizontal winding 52 generates an independent radial horizontal control magnetic field. The second radial horizontal stator 61 has a plurality of fourth stator teeth 611, each equipped with a second radial horizontal winding 62. Each second radial horizontal winding 62 is independently controlled to generate an independent radial horizontal control magnetic field. The windings on each stator tooth are independently controlled, so that if the winding on one stator tooth fails, the current supplied to another stator tooth can be increased, or the current supplied to all remaining stator teeth can be increased simultaneously to generate a sufficiently strong control magnetic field, thus stabilizing the control of the rotating shaft.

[0097] The magnetic bearing assembly in the above embodiment can also be used in the technical field of motor equipment. That is, according to another aspect of the present invention, a motor is provided, including a magnetic bearing assembly, which is the magnetic bearing assembly in the above embodiment.

[0098] The magnetic bearing assembly in the above embodiment can also be used in the technical field of compressor equipment. That is, according to another aspect of the present invention, a compressor is provided, including a magnetic bearing assembly, which is the magnetic bearing assembly in the above embodiment.

[0099] Specifically, in order to solve the problems in the prior art five-degree-of-freedom suspension system in which two radial bearings and an axial bearing are arranged in parallel, resulting in an increase in the axial space of the five-degree-of-freedom suspension system, an elongation of the axial length of the rotor, an increase in flexibility, abnormal mutual coupling between the radial horizontal and radial vertical control magnetic fields of the radial permanent magnet bias bearing, simplified control logic of the magnetic suspension system, and poor stability and reliability of the magnetic suspension bearing control system, this application proposes a new magnetic circuit decoupling five-degree-of-freedom magnetic suspension bearing assembly.

[0100] like Figure 9 As shown, the rotating shaft realizes five-degree-of-freedom suspension, that is, the rotating shaft realizes five-degree-of-freedom directional control of rotation around the Y axis, translation along the Y axis (radial vertical direction), rotation around the X axis, translation along the X axis (radial horizontal direction), and translation along the Z axis (axial direction).

[0101] like Figure 1 、 Figure 3 As shown, the permanent magnet 11, the outer stator core 10, the first radial vertical stator 21, the second radial vertical stator 31, the first radial vertical winding 22, the second radial vertical winding 32, and the radial vertical rotor 42 form a radial-vertical two-degree-of-freedom control system, which enables the rotating shaft 41 to translate along the Y-axis and rotate about the X-axis. The permanent magnet 11, the outer stator core 10, the first radial horizontal stator 51, the second radial horizontal stator 61, the first radial horizontal winding 52, the second radial horizontal winding 62, the first radial horizontal rotor 43, the second radial horizontal rotor 44, and the radial vertical rotor 42 form an axial-radial-horizontal three-degree-of-freedom control system, which enables the rotating shaft 41 to translate along the X- and Z-axes and rotate about the Y-axis. The dual radial-axial integrated structure of the five-degree-of-freedom magnetic levitation bearing reduces the axial space occupied by the magnetic levitation system and shortens the length of the rotating shaft. The radial vertical and horizontal control magnetic fields are independent and uncoupled from each other, realizing independent radial and horizontal regulation of the rotating shaft, thereby simplifying the control logic of the magnetic levitation system and improving the stability and reliability of the system.

[0102] The axis of rotation realizes radial and vertical two-degree-of-freedom suspension control, that is, translation along the Y axis and rotation around the X axis. The working principle is as follows Figure 1As shown, the permanent magnet 11 (with an N pole on the outside and an S pole on the inside) generates a radial vertical bias magnetic field C1 that passes through the first radial vertical stator 21 and the second radial vertical stator 31 at the left and right ends of the permanent magnet 11, and forms a closed loop with the radial vertical rotor 42, forming a bias magnetic flux between the main air gaps of the first radial vertical stator 21, the second radial vertical stator 31 and the radial vertical rotor 42. When the shaft is in a balanced position, the bias magnetic flux between the upper and lower main air gaps in the vertical direction is the same, and the shaft will be in a balanced state. Among them, when the shaft 41 is impacted and deflected downward along the Y axis (vertical direction), the upper gap in the vertical direction increases and the lower gap decreases, resulting in a decrease in the bias magnetic flux in the upper main air gap and an increase in the bias magnetic flux in the lower main air gap. Because when the magnetic pole area is constant, the magnetic field attraction is proportional to the square of the magnetic flux, and the downward attraction is greater than the upward attraction. Without external control, the shaft continues to deflect downward and cannot return to the equilibrium position. The same control current is passed through the first radial vertical winding 22 and the second radial vertical winding 32 to generate a control magnetic field, which passes through the first radial vertical stator 21, the second radial vertical stator 31, and the radial vertical rotor 42 to form a closed loop, forming a radial vertical control magnetic field C2, increasing the bias flux in the upper main air gap and reducing the bias flux in the lower main air gap, so that the upward suction force is greater than the downward suction force, and the rotating shaft 41 deflects upward to restore the equilibrium position. The radial vertical control winding stops being energized, and the rotating shaft 41 is controlled to move in the Y-axis direction. When the rotating shaft is subjected to an impact and rotates clockwise around the X-axis, the main air gap magnetic flux between the first radial vertical stator 21 and the radial vertical rotor 42 changes, the upper air gap magnetic flux increases, and the lower air gap magnetic flux decreases, and the rotating shaft 41 is subjected to an upward suction force. The main air gap between the second radial vertical stator 31 and the radial vertical rotor 42 changes, the upper air gap magnetic flux decreases, and the lower air gap magnetic flux increases, and the rotating shaft is subjected to a downward suction force. The suction forces at the left and right ends will form a clockwise torque, and the rotating shaft 41 continues to rotate clockwise and cannot restore balance. The first radial vertical winding 22 and the second radial vertical winding 32 are energized with control currents in opposite directions, so that the upper magnetic flux at the left end of the rotating shaft 41 decreases and the lower magnetic flux increases. The left end of the rotating shaft 41 is subjected to a downward suction force, the upper magnetic flux at the right end of the rotating shaft 41 increases and the lower magnetic flux decreases. The right end of the rotating shaft 41 is subjected to an upward suction force, and the rotating shaft 41 is subjected to a counterclockwise torque and gradually returns to a balanced position. The radial vertical control winding stops being energized, and the rotating shaft is controlled to rotate around the X-axis.

[0103] The rotating shaft realizes the axial-radial horizontal freedom, that is, it moves along the X axis (radial horizontal) and rotates around the Y axis. The working principle of the axial direction movement control is the same as the existing technology. Figure 1 、 Figure 3As shown, the permanent magnet 11 generates a bias magnetic field, which forms a closed loop through the outer stator core 10, the first radial horizontal stators 51 at the left and right ends, the second radial horizontal stators 61, the first radial horizontal rotor 43, the second radial horizontal rotor 44, and the radial vertical rotor 42, forming an axial-radial horizontal bias magnetic field C3, as Figure 10 As shown, the suction forces of the first radial horizontal stator 51 and the second radial horizontal stator 61 on the first radial horizontal rotor 43 and the second radial horizontal rotor 44 are F1, F2, F3, and F4 respectively. When the rotating shaft 41 is in the equilibrium position, F1, F2, F3, and F4 are equal in magnitude but different in direction, and the total force on the rotating shaft 41 is zero, maintaining the equilibrium state. Among them, when the rotating shaft 41 moves downward in the radial horizontal (X-axis) direction, the gaps on the lower sides at the left and right ends decrease, the magnetic flux increases, the gaps at the upper ends increase, and the magnetic flux decreases, causing downward suction forces to be generated at both ends of the rotating shaft 41 (F1 = F3 < F2 = F4), and the rotating shaft will continue to translate downward and cannot return to the equilibrium position. The first radial horizontal winding 52 and the second radial horizontal winding 62 are supplied with the same control current to generate a control magnetic circuit, which respectively pass through the first radial horizontal stator 51, the second radial horizontal stator 61, the first radial horizontal rotor 43, and the second radial horizontal rotor 44 to form a closed loop, forming an axial-radial horizontal control magnetic field C4, adjusting the control magnetic fluxes at the left and right ends, so that upward suction forces (F1 = F3 > F2 = F4) act on both the left and right ends of the rotating shaft, as Figure 11 As shown, the rotating shaft 41 will continue to translate upward until it returns to the equilibrium position, the control winding stops being powered on, and the translation control of the rotating shaft 41 along the X-axis direction is achieved. When the rotating shaft 41 is subjected to an impact and rotates counterclockwise around the Y-axis, the left end rotates downward, the gap at the upper end increases, the magnetic flux decreases, the gap at the lower end decreases, the magnetic flux increases, the suction force at the lower end is greater than that at the upper end, a downward suction force acts on the left end of the rotating shaft 41, and similarly, the opposite is true for the right end, an upward suction force acts on the right end of the rotating shaft 41 (F1 = F4 < F2 = F3), and the rotating shaft 41 continuously bears a counterclockwise torque and cannot return to the equilibrium position. Through the action of controlling the first radial horizontal winding 52 and the second radial horizontal winding 62 at the left and right ends, control currents of equal magnitude and opposite directions are applied to both ends, so that an upward suction force acts on the left end of the rotating shaft and a downward suction force acts on the right end (F1 = F4 > F2 = F3). As Figure 12 As shown, the rotating shaft 41 bears a clockwise rotating torque until it returns to the equilibrium position, and the rotation control of the rotating shaft 41 around the Y-axis is achieved. When the rotating shaft 41 undergoes an axial leftward displacement, the gap between the left end stator and the rotor increases, the magnetic flux decreases, that is, F1 and F2 decrease, and similarly, F3 and F4 increase at the right end, and the rotating shaft 41 continuously bears a leftward load and cannot return to the equilibrium position. The first radial horizontal winding 52 is intermittently supplied with currents of equal magnitude and opposite directions to respectively achieve as Figure 13The suction forces F1 and f1 shown are equal in magnitude but different in direction, and the suction forces F2 and f2 are equal in magnitude but different in direction. F1 and F2 are the suction forces generated by the stator on the rotor when a positive current is passed through the control winding, and f1 and f2 are the suction forces generated by the stator on the rotor when a negative current is passed through the control winding. This causes the rotating shaft 41 to intermittently bear the rightward displacement load until it returns to the equilibrium position, and the control winding stops being energized to achieve axial displacement control of the rotating shaft 41.

[0104] This magnetic levitation bearing assembly solves the existing problem of using a dual radial bearing and axial bearing in parallel, resulting in a large axial span, long rotating shaft, high flexibility, numerous control components, and high material costs for the magnetic levitation system. The existing bearing structure couples the radial horizontal and vertical degrees of freedom control magnetic circuits, making the control logic complex. The radial and axial degrees of freedom control windings have a single function, resulting in low control system reliability.

[0105] The magnetic levitation bearing assembly of the present application has an integrated dual radial bearing and axial bearing structure, and the axial-radial horizontal stator poles have a tapered angle, which generates a force that can control the axial degree of freedom and radial horizontal degree of freedom of the rotating shaft. This arrangement makes the axial space of the magnetic levitation bearing assembly small, the rotating shaft length short, and the flexibility small. The entire suspension system shares a permanent magnet 11, and the axial-radial horizontal degrees of freedom share a set of control components, which reduces the number of components and reduces the material cost of the magnetic levitation system. The dual radial adopts an integrated structure, and the dual radial magnetic poles achieve four-degree-of-freedom suspension of the rotating shaft. The magnetic pole edge effect is used to axially control the rotating shaft 41 to achieve five-degree-of-freedom suspension of the rotating shaft 41, reducing the number of components and saving the material cost and space occupied by the axial bearing. The radial horizontal and vertical degree of freedom control systems are set independently, so that the radial horizontal and vertical degree of freedom control magnetic circuits are independent of each other and uncoupled, simplifying the radial degree of freedom control logic and improving the stability and reliability of the radial control of the magnetic levitation bearing. Multi-winding control of radial and axial degrees of freedom avoids the magnetic levitation system being in an uncontrolled state when a single winding control failure occurs, thereby improving the stability and reliability of the magnetic levitation system.

[0106] Furthermore, the dual radial-axial magnetic suspension bearing has an integrated structure, and the axial-radial horizontal stator has a conical magnetic pole, which generates a force to control the axial movement and radial horizontal movement of the shaft, so that the radial horizontal degree of freedom and the axial degree of freedom share a set of control elements, reducing the space occupied by the magnetic suspension axial direction, shortening the shaft length, reducing flexibility, reducing the number of components, and saving material costs. Figure 5 As shown, the dual radial magnetic poles realize four-degree-of-freedom suspension of the rotating shaft 41, and the magnetic pole edge effect is used to realize axial control of the rotating shaft 41, realizing five-degree-of-freedom suspension of the rotating shaft, reducing the number of components, and saving the cost of axial bearing materials and occupied space.

[0107] like Figure 14 As shown, in an embodiment of the present application, a bearing assembly structure with axially arranged control poles of radial four degrees of freedom is also provided. The control magnetic fields of the magnetic levitation assembly of this embodiment are uncoupled and independent of each other, which simplifies the radial degree of freedom control logic and improves the stability of the radial control of the magnetic levitation bearing.

[0108] Specifically, if Figures 14 to 17 As shown, in another embodiment of the present application, the magnetic bearing assembly includes an outer stator core 10, a first radial vertical stator assembly 20, a first radial horizontal stator assembly 50, and a rotor assembly 40. A permanent magnet 11 is provided in the first end of the outer stator core 10. The first radial vertical stator assembly 20 is provided in the second end of the outer stator core 10. The first radial horizontal stator assembly 50 is provided in the outer stator core 10 and is located between the permanent magnet 11 and the first radial vertical stator assembly 20. The rotor assembly 40 is provided in the outer stator core 10, and the rotor assembly 40 includes a rotating shaft 41. The first radial vertical stator assembly 20 and the first radial horizontal stator assembly 50 are used to generate independent control magnetic fields. The control magnetic fields generated by the permanent magnet 11, the first radial vertical stator assembly 20, and the first radial horizontal stator assembly 50 control the rotating shaft 41 to move in a preset direction.

[0109] In this embodiment, a permanent magnet 11, a first radial vertical stator assembly 20, a first radial horizontal stator assembly 50 and a rotor assembly 40 are arranged in the outer stator core 10, and the first radial vertical stator assembly 20 and the first radial horizontal stator assembly 50 are arranged to generate an independent control magnetic field. This arrangement can avoid coupling inside the magnetic bearing assembly, and the magnetic bearing assembly adopting this structure is compact inside, reducing the axial height of the magnetic bearing assembly, and effectively improving the stability and reliability of the magnetic bearing assembly.

[0110] Specifically, the first radial vertical stator assembly 20 includes a first radial vertical stator 21 and a first radial vertical winding 22. The first radial vertical stator 21 is an annular structure. The first radial vertical stator 21 is disposed within the second end of the outer stator core 10 and on one side of the permanent magnet 11. The first stator teeth 211 are disposed on the inner circle of the first radial vertical stator 21. The first radial vertical winding 22 is wound around the first stator teeth 211. In this embodiment, there are two first stator teeth 211, each of which is provided with a first radial vertical winding 22, and the two first stator teeth 211 are disposed opposite each other. The first radial horizontal stator assembly 50 includes a first radial horizontal stator 51 and a first radial horizontal winding 52. The first radial horizontal stator 51 is an annular structure. It is disposed within the outer stator core 10 and between the permanent magnets 11 and the first radial vertical stator 21. The first radial horizontal stator 51 is coaxial with the first radial vertical stator 21. Third stator teeth 511 are disposed on the inner circumference of the first radial horizontal stator 51. First radial horizontal windings 52 are wound around the third stator teeth 511. There are preferably two third stator teeth 511, each of which is provided with a first radial horizontal winding 52, with the two third stator teeth 511 disposed opposite each other.

[0111] In order to further improve the reliability of magnetic levitation components, such as Figure 14 As shown, the magnetic bearing assembly further includes a magnetic isolation ring 53. The magnetic isolation ring 53 is disposed within the outer stator core 10 and is sleeved on the outer circumferential surface of the first radial horizontal stator 51. In this embodiment, a first annular protrusion 15 and a second annular protrusion 16 are provided on the inner circumferential surface from the first end to the second end of the outer stator core 10. The inner diameter of the first annular protrusion 15 is smaller than that of the second annular protrusion 16. The permanent magnet 11 is annular in structure, and the outer circumference of the permanent magnet 11 is arranged to fit snugly with the inner circumference of the first annular protrusion 15. The first radial horizontal stator 51 is arranged within the annular cavity formed by the inner circumference of the second annular protrusion 16, and is spaced apart from the inner stepped surface of the first annular protrusion 15. The first radial vertical stator 21 is arranged within the outer stator core 10 and is located to one side of the stepped surface of the second annular protrusion 16, and is spaced apart from the stepped surface of the second annular protrusion 16. This arrangement can further improve the stability of the magnetic levitation assembly.

[0112] The magnetic bearing assembly also includes a first magnetic ring 80 and a second magnetic ring 90. The first magnetic ring 80 is arranged in the outer stator core 10 and is located between the first annular protrusion 15 and the first radial horizontal stator 51. The second magnetic ring 90 is arranged in the outer stator core 10 and is located between the first radial vertical stator 21 and the second annular protrusion 16.

[0113] Among them, there are multiple first stator teeth 211, and the first radial vertical winding 22 on each first stator tooth 211 independently generates a control magnetic field. When one of the first radial vertical windings 22 fails, the access current of at least one of the remaining first radial vertical windings 22 can be increased to generate a magnetic field of a preset strength. There are multiple third stator teeth 511, and the first radial horizontal winding 52 on each third stator tooth 511 independently generates a control magnetic field. When one of the first radial horizontal windings 52 fails, the access current of at least one of the remaining first radial horizontal windings 52 can be increased to generate a magnetic field of a preset strength.

[0114] like Figure 1 、 Figure 9 As shown, radial and axial degrees of freedom are controlled by multiple windings. The control windings on the stator poles are independent of each other. When a winding on a stator fails, the other control winding on the same stator only needs to increase the control current to generate the same control magnetic field, exercise the corresponding control function, and improve the reliability of the radial control of the magnetic levitation bearing.

[0115] Specifically, the magnetic circuit decouples the five-degree-of-freedom magnetic bearing as Figure 8As shown, the dual radial-axial integrated system controls the five degrees of freedom of the rotating shaft. The components for realizing the five-degree-of-freedom control of the rotating shaft are composed of a rotating shaft 41, a radial vertical rotor 42, a first radial horizontal rotor 43, a second radial horizontal rotor 44, a precision nut 70, a first radial horizontal winding 52, a second radial horizontal winding 62, a first radial horizontal stator 51, a second radial horizontal stator 61, a first radial vertical winding 22, a second radial vertical winding 32, a first radial vertical stator 21, a second radial vertical stator 31, a first magnetic isolation ring 23, a second magnetic isolation ring 33, an outer stator core 10, and a permanent magnet 11. The permanent magnet 11 is embedded in the outer stator core 10 by means of gluing or shrink fitting. There is a boss on the inner side of the outer stator core 10 (the boss can be an annular structure, i.e., an annular boss 12, or a semicircular structure) for axial positioning of the permanent magnet. The magnetic isolation ring is installed on the inner walls on both sides of the outer stator core 10 by means of gluing. There is an annular groove on the inner wall of the outer stator core 10 for axial and radial positioning of the magnetic isolation ring. The first radial vertical winding 22 and the second radial vertical winding 32 are respectively fixed to the first radial vertical stator 21 and the second radial vertical stator 31 by means of gluing and binding to form a radial vertical stator assembly. The radial vertical stator assembly is embedded on both sides of the outer stator core 10 by means of shrink fitting and screw fastening. Preferably, four bosses are present on both sides of the outer stator core 10 to axially position the radial vertical stator assembly. The first radial horizontal winding 52 and the second radial horizontal winding 62 are respectively wound on the first radial horizontal stator 51 and the second radial horizontal stator 61. The windings are fixed to the outer stator core 10 by gluing and binding to form an axial-radial horizontal stator assembly. The axial-radial horizontal stator assembly is installed on both sides of the outer stator core 10 by shrink fitting and screw fixing. Bosses are present on both sides of the outer stator core 10 to axially fix the axial-radial horizontal stator assembly. The above assembly process completes the fixed installation of the five-degree-of-freedom magnetic suspension bearing stator assembly. The radial vertical rotor 42 is installed on the rotating shaft 41 from the left end by shrink fitting. The convex step on the right end of the rotating shaft 41 axially positions the radial vertical rotor 42. The first radial horizontal rotor is shrink fitted onto the left end of the rotating shaft, with the right side tightly fitting the left side of the radial vertical rotor 42. A precision nut is used to achieve axial fixed installation. The shaft is installed from the left end of the magnetic bearing stator assembly. After the shaft is installed, the second radial horizontal rotor is shrink-fitted on the rotating shaft from the right end, tightly fitting with the radial vertical rotor 42 to achieve axial positioning. The second radial horizontal rotor is locked and fixed with a precision nut to complete the installation of the entire five-degree-of-freedom magnetic bearing.

[0116] The radial vertical two-degree-of-freedom suspension system is composed of the outer stator core 10, permanent magnets, the first radial vertical winding 22, the second radial vertical winding 32, the first radial vertical stator 21, the second radial vertical stator 31, and the radial vertical rotor 42, which realizes the translation of the rotating shaft 41 along the Y axis and the rotation around the X axis. The working principle is as follows: Figure 3 As shown, the permanent magnet generates a bias magnetic field, generating a bias magnetic flux between the radial vertical stators and the rotor at both ends. The radial vertical control windings at both ends generate independent control magnetic fields, independently controlling the displacement mode of the two ends of the rotating shaft, simplifying the control logic, and improving the stability of the suspension system. The control windings at both ends are multi-winding controlled. When one winding fails, the other winding can increase the control current to generate the same control magnetic field, realize the demand regulation of the rotating shaft, improve the reliability of the suspension system, and realize the translational motion of the rotating shaft 41 along the Y-axis and the rotation control around the X-axis.

[0117] The outer stator core 10, the permanent magnet 11 (the permanent magnet is an annular structure), the first radial horizontal winding 52, the second radial horizontal winding 62, the first radial horizontal stator 51, the second radial horizontal stator 61, the first radial horizontal rotor 43, the second radial horizontal rotor 44, and the radial vertical rotor 42 form an axial-radial three-degree-of-freedom magnetic suspension system, which realizes the translational motion of the rotating shaft 41 along the X-axis and the Z-axis and the rotation around the Y-axis. The control principle is as follows: Figure 3 As shown, the permanent magnet generates a bias magnetic field, generating a bias magnetic flux between the axial-radial horizontal stator and the axial-radial horizontal rotor at both ends, and the control windings at both ends generate independent control magnetic fields, independently controlling the load size at both ends of the shaft, respectively. Figures 10 to 13 The load mode in the embodiment can realize the translation of the rotating shaft 41 along the X-axis direction, the Z-axis direction and the rotation control around the Y-axis.

[0118] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0119] In addition to the above, it should be noted that references to "one embodiment," "another embodiment," "an embodiment," and the like in this specification refer to specific features, structures, or characteristics described in conjunction with that embodiment as included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in conjunction with any embodiment, it is intended that such feature, structure, or characteristic, when implemented in conjunction with other embodiments, also falls within the scope of the present invention.

[0120] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0121] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A magnetic bearing assembly, characterized in that: include: An outer stator core (10), wherein a permanent magnet (11) is provided in the outer stator core (10); a first stator assembly, the first stator assembly being arranged in the outer stator core (10) and located on a first side of the permanent magnet (11); a second stator assembly, the second stator assembly being arranged in the outer stator core (10) and located on a second side of the permanent magnet (11), the first stator assembly and the second stator assembly being arranged opposite to each other; A rotor assembly (40), the rotor assembly (40) being disposed in the outer stator core (10), the rotor assembly (40) comprising a rotating shaft (41); The first stator assembly and the second stator assembly are used to generate independent control magnetic fields, the permanent magnet (11) generates a bias magnetic field, and the control magnetic field is used to control the bias magnetic field to control the rotating shaft (41) to perform translational motion along the Y axis, rotation around the Y axis, translational motion along the X axis, rotation around the X axis and / or translational motion along the Z axis, the X axis and the Y axis are along the radial direction of the rotating shaft (41), and the Z axis is the axial direction of the rotating shaft (41); The first stator assembly comprises a first radial vertical stator assembly (20), the first radial vertical stator assembly (20) being arranged in the outer stator core (10) and located on a first side of the permanent magnet (11), and the second stator assembly comprises a second radial vertical stator assembly (30), the second radial vertical stator assembly (30) being arranged in the outer stator core (10) and located on a second side of the permanent magnet (11); The first stator assembly includes a first radial horizontal stator assembly (50), the first radial horizontal stator assembly (50) is arranged in the first end of the outer stator core (10) and is located outside the first radial vertical stator assembly (20), and the second stator assembly includes a second radial horizontal stator assembly (60), the second radial horizontal stator assembly (60) is arranged in the second end of the outer stator core (10) and is located outside the second radial vertical stator assembly (30); Wherein, the first radial horizontal stator assembly (50) and the second radial horizontal stator assembly (60) are used to generate independent radial horizontal control magnetic fields; The first radial horizontal stator assembly (50) comprises: a first radial horizontal stator (51), wherein the first radial horizontal stator (51) is an annular structure; The second radial horizontal stator assembly (60) comprises: a second radial horizontal stator (61), wherein the second radial horizontal stator (61) is an annular structure; The rotor assembly (40) further comprises: a first radial horizontal rotor (43), the first radial horizontal rotor (43) being arranged inside a first end of the outer stator core (10) and being located outside the first radial horizontal stator (51) in an axial direction, the first radial horizontal rotor (43) being arranged in coordination with the first radial horizontal stator (51); a second radial horizontal rotor (44), the second radial horizontal rotor (44) being arranged in the second end of the outer stator core (10) and being located outside the second radial horizontal stator (61) in the axial direction; the second radial horizontal rotor (44) being arranged in coordination with the second radial horizontal stator (61); and the rotating shaft (41) being passed through the first radial horizontal rotor (43) and the second radial horizontal rotor (44); The diameter of the cross section of at least one of the first radial horizontal rotor (43) and the second radial horizontal rotor (44) is arranged to gradually increase outward along the direction of the rotation shaft (41).

2. The magnetic bearing assembly according to claim 1, characterized in that: The first radial vertical stator assembly (20) and the second radial vertical stator assembly (30) are arranged opposite to each other; The first radial vertical stator assembly (20) and the second radial vertical stator assembly (30) are used to generate independent radial vertical control magnetic fields.

3. The magnetic bearing assembly according to claim 2, characterized in that: The first radial vertical stator assembly (20) comprises: a first radial vertical stator (21), the first radial vertical stator (21) being an annular structure, the first radial vertical stator (21) being arranged in the outer stator core (10) and located on a first side of the permanent magnet (11), and first stator teeth (211) being arranged on an inner circle of the first radial vertical stator (21); A first radial vertical winding (22), wherein the first radial vertical winding (22) is wound on the first stator tooth (211).

4. The magnetic bearing assembly according to claim 3, characterized in that: There are two first stator teeth (211), each of the first stator teeth (211) is provided with the first radial vertical winding (22), and the two first stator teeth (211) are arranged opposite to each other.

5. The magnetic bearing assembly according to claim 2, characterized in that: The first radial vertical stator assembly (20) further comprises: A first magnetic isolation ring (23), wherein the first magnetic isolation ring (23) is arranged in the outer stator core (10), and the first magnetic isolation ring (23) is sleeved on the outer peripheral surface of the first radial vertical stator (21).

6. The magnetic bearing assembly according to claim 3, characterized in that: The second radial vertical stator assembly (30) comprises: a second radial vertical stator (31), the second radial vertical stator (31) being an annular structure, the second radial vertical stator (31) being arranged in the outer stator core (10) and located on the second side of the permanent magnet (11), and second stator teeth (311) being arranged on the inner circle of the second radial vertical stator (31); A second radial vertical winding (32), wherein the second radial vertical winding (32) is wound on the second stator tooth (311).

7. The magnetic bearing assembly according to claim 6, characterized in that: There are two second stator teeth (311), each of the second stator teeth (311) is provided with a second radial vertical winding (32), and the two second stator teeth (311) are arranged opposite to each other.

8. The magnetic bearing assembly according to claim 6, characterized in that: The second radial vertical stator assembly (30) further comprises: A second magnetic isolation ring (33), the second magnetic isolation ring (33) is arranged in the outer stator core (10), and the second magnetic isolation ring (33) is sleeved on the outer peripheral surface of the second radial vertical stator (31).

9. The magnetic bearing assembly according to claim 8, characterized in that: The first radial horizontal stator assembly (50) comprises: The first radial horizontal stator (51) is arranged inside the first end of the outer stator core (10) and is located outside the first radial vertical stator assembly (20) in the axial direction, and third stator teeth (511) are arranged on the inner circle of the first radial horizontal stator (51); A first radial horizontal winding (52), wherein the first radial horizontal winding (52) is wound on the third stator tooth (511).

10. The magnetic bearing assembly according to claim 9, characterized in that: There are two third stator teeth (511), and the two third stator teeth (511) are arranged opposite to each other.

11. The magnetic bearing assembly according to claim 10, characterized in that: The geometric center line of the third stator tooth (511) along the first radial horizontal stator (51) is arranged perpendicular to the geometric center line of the first stator tooth (211) along the first radial vertical stator (21).

12. The magnetic bearing assembly according to claim 11, characterized in that: The second radial horizontal stator assembly (60) comprises: The second radial horizontal stator (61) is arranged inside the second end of the outer stator core (10) and is located outside the second radial vertical stator assembly (30) in the axial direction, and a fourth stator tooth (611) is provided on the inner circle of the second radial horizontal stator (61); A second radial horizontal winding (62), wherein the second radial horizontal winding (62) is wound on the fourth stator tooth (611).

13. The magnetic bearing assembly according to claim 12, characterized in that: There are two fourth stator teeth (611), and the two fourth stator teeth (611) are arranged opposite to each other.

14. The magnetic bearing assembly according to claim 13, characterized in that: The geometric center line of the fourth stator tooth (611) along the second radial horizontal stator (61) is arranged perpendicular to the geometric center line of the second stator tooth (311) along the second radial vertical stator (31).

15. The magnetic bearing assembly according to claim 14, characterized in that: The rotor assembly (40) comprises: A radial vertical rotor (42) is provided. The inner circles of the first radial vertical stator (21), the outer stator core (10) and the second radial vertical stator (31) are formed for mounting the radial vertical rotor (42). The radial vertical rotor (42) is arranged in coordination with the first radial vertical stator (21), the outer stator core (10) and the second radial vertical stator (31). The rotating shaft (41) is passed through the radial vertical rotor (42).

16. The magnetic bearing assembly according to claim 8, characterized in that: An annular boss (12) is provided in the middle of the outer stator core (10), and the outer peripheral surface of the permanent magnet (11) is attached to the inner circle of the annular boss (12). The side of the outer surface of the permanent magnet (11) facing the outer stator core (10) is an N pole, and the side of the permanent magnet (11) facing the rotating shaft (41) is an S pole.

17. The magnetic bearing assembly according to claim 16, characterized in that: The height of the annular boss (12) in the axial direction is the same as the height of the permanent magnet (11) in the axial direction.

18. The magnetic bearing assembly according to claim 17, characterized in that: A first annular step (13) is provided in the first end of the outer stator core (10), and a mounting space for accommodating the first radial horizontal stator assembly (50) is formed between the step surface of the first annular step (13) and the end of the outer stator core (10), and a mounting space for accommodating the first radial vertical stator assembly (20) is formed between the step surface of the first annular step (13) and one side of the annular boss (12).

19. The magnetic bearing assembly according to claim 18, characterized in that: A second annular step (14) is provided in the second end of the outer stator core (10), and a mounting space for accommodating the second radial horizontal stator assembly (60) is formed between the step surface of the second annular step (14) and the end of the outer stator core (10), and a mounting space for accommodating the second radial vertical stator assembly (30) is formed between the step surface of the second annular step (14) and one side of the annular boss (12).

20. The magnetic bearing assembly according to claim 13, characterized in that: The first radial vertical stator (21) has a plurality of first stator teeth (211), each of the first stator teeth (211) is provided with a first radial vertical winding (22), each of the first radial vertical windings (22) is independently controlled so that each of the first radial vertical windings (22) generates an independent radial vertical control magnetic field, and / or The second radial vertical stator (31) has a plurality of second stator teeth (311), each second stator tooth (311) is provided with a second radial vertical winding (32), each second radial vertical winding (32) is independently controlled so that each second radial vertical winding (32) generates an independent radial vertical control magnetic field, and / or The first radial horizontal stator (51) has a plurality of third stator teeth (511), each of the third stator teeth (511) is provided with a first radial horizontal winding (52), each of the first radial horizontal windings (52) is independently controlled so that each of the first radial horizontal windings (52) generates an independent radial horizontal control magnetic field, and / or The second radial horizontal stator (61) has a plurality of fourth stator teeth (611), each of the fourth stator teeth (611) is provided with a second radial horizontal winding (62), and each of the second radial horizontal windings (62) is independently controlled so that each of the second radial horizontal windings (62) generates an independent radial horizontal control magnetic field.

21. A motor comprising a magnetic bearing assembly, characterized in that: The magnetic bearing assembly is the magnetic bearing assembly according to any one of claims 1 to 20.

22. A compressor comprising a magnetic bearing assembly, characterized in that: The magnetic bearing assembly is the magnetic bearing assembly according to any one of claims 1 to 20.

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