Magnetic bearing components, motors and compressors

Abstract

The present invention provides a magnetic suspension bearing assembly, a motor and a compressor. The magnetic suspension bearing assembly includes a housing; a permanent magnet assembly is arranged in the housing; a first stator assembly is arranged in the housing and is located on a first side of the permanent magnet assembly; a second stator assembly is arranged in the housing and is located on a second side of the permanent magnet assembly, and the second stator assembly is arranged opposite to the first stator assembly; a rotating shaft is sequentially arranged in the first stator assembly, the permanent magnet assembly and the second stator assembly; the permanent magnet assembly generates a bias magnetic field, and the control magnetic field controls 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 by adjusting the bias magnetic field, 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. The magnetic suspension bearing assembly adopting this structure has a compact structure, can effectively shorten the axial length of the magnetic suspension, and the structure is simple and has good stability.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic bearing equipment, 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 no contact, no wear, high speed, high precision, no need for lubrication and sealing, etc. They are high-tech products integrating electromagnetism, electronic technology, control engineering, signal processing and mechanics.

[0003] Magnetic bearings are divided into three types: active, passive, and hybrid. Active magnetic bearings have high stiffness and can be precisely controlled, but the volume and power consumption required to produce unit load-bearing capacity are large. Passive magnetic bearings use the attraction or repulsion between magnetic materials to achieve rotor suspension, and have relatively low stiffness and damping. Hybrid magnetic bearings use permanent magnets to provide a bias magnetic field to replace the static bias magnetic field generated by the electromagnet in active magnetic bearings, reduce the ampere-turns of the control winding, reduce the volume of the bearing, and improve the bearing load-bearing capacity. Hybrid magnetic bearings have irreplaceable advantages in areas with strict requirements on volume and power consumption, and magnetic bearings are mainly used in high-speed and ultra-high-speed applications. Therefore, the integration and miniaturization of magnetic suspension systems and improving the stability and reliability of control systems will be key research directions.

[0004] In order to achieve contactless support for the rotor, the magnetic suspension bearing system needs to control the five degrees of freedom in its space. The traditional magnetic suspension structure uses a permanent magnet biased front radial bearing and a permanent magnet biased rear radial bearing to control the suspension control of the four degrees of freedom of the rotating shaft in the radial direction, and a permanent magnet biased axial bearing to control the suspension control of the axial degree of freedom of the rotating shaft. Two sets of permanent magnet biased radial electromagnetic bearings and one set of permanent magnet biased axial bearings realize the five-degree-of-freedom suspension of the rotor space. The bias magnetic field is generated by the permanent magnet, and a closed loop is formed by the auxiliary stator poles, the rotating shaft, and the radial stator poles to form a permanent magnet bias magnetic field. A bias magnetic flux is formed in the main air gap between the radial stator poles and the rotating shaft. The radial horizontal and vertical control windings are fed with control current to generate a control magnetic field. The control magnetic field is formed inside the stator core and the rotating shaft to adjust the bias magnetic flux between the radial stator poles and the main air gap of the rotating shaft, and the radial two-degree-of-freedom suspension control is realized. Among them, the permanent magnet generates a bias magnetic field, and a closed loop is formed 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, and a closed loop is formed through the stator core and thrust plate to form a control magnetic circuit. The bias magnetic flux in the stator core and thrust plate at the left and right ends is adjusted 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 degrees of freedom of the rotor. There are two disadvantages in this magnetic suspension system structure:

[0005] 1. Two radial bearings are placed side by side with the axial bearing 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 purpose, according to one aspect of the present invention, a magnetic bearing assembly is provided, comprising: a shell; a permanent magnet assembly, which is arranged in the shell; a first stator assembly, which is arranged in the shell and located on a first side of the permanent magnet assembly; a second stator assembly, which is arranged in the shell and located on a second side of the permanent magnet assembly, and the second stator assembly is arranged opposite to the first stator assembly; a rotor assembly, which comprises a rotating shaft, and the rotating shaft is sequentially arranged in the first stator assembly, the permanent magnet assembly and the second stator assembly; wherein the first stator assembly and the second stator assembly are used to generate independent control magnetic fields, the permanent magnet assembly generates a bias magnetic field, and the control magnetic field controls 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 by adjusting the bias magnetic field, 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] Further, the first stator assembly includes: a first auxiliary stator core assembly, which is arranged in the shell and located on the first side of the permanent magnet assembly; a first E-type stator assembly, which is multiple, and the multiple first E-type stator assemblies are arranged in an annular structure and are located on the side of the first auxiliary stator core assembly away from the permanent magnet assembly. The multiple first E-type stator assemblies cooperate with the first auxiliary stator core assembly to form multiple independent control magnetic circuits in the radial direction of the first stator assembly.

[0010] Furthermore, the first auxiliary stator core assembly includes: a first magnetic isolation frame, which is a ring-shaped structure, and a plurality of first installation notches are arranged at the outer edge of the first magnetic isolation frame; a first auxiliary stator core, which is a plurality of first auxiliary stator cores, and a first auxiliary stator core is arranged in each first installation notch, and the plurality of first auxiliary stator cores are arranged one-to-one correspondingly to the plurality of first E-type stator assemblies.

[0011] Furthermore, a plurality of first magnetic isolation plates are arranged on the surface of the first magnetic isolation frame facing the first E-type stator assembly, and an installation space for installing the first E-type stator assembly is formed between adjacent first magnetic isolation plates.

[0012] Furthermore, the first E-type stator assembly includes: a first E-type stator body, a plurality of first stator teeth are arranged on the inner circle of the first E-type stator body, and the radial width of at least one of the plurality of first stator teeth is set differently from the widths of the remaining first stator teeth.

[0013] Furthermore, the first E-type stator assembly includes: a first winding, a plurality of first windings, the plurality of first windings are respectively arranged on a plurality of first stator teeth, so that each first stator tooth is provided with a first winding, and at least one of the plurality of first windings is independently controlled from the remaining first windings.

[0014] Furthermore, the multiple first windings include at least one first main winding, and the rest are first auxiliary windings. When the first main winding fails, the first auxiliary winding starts to work to replace the main winding. The first main winding and the remaining first auxiliary windings are independently controlled, and all the first auxiliary windings are arranged in series.

[0015] Furthermore, the second stator assembly includes: a second auxiliary stator core assembly, which is arranged in the shell and located on the second side of the permanent magnet assembly; a second E-type stator assembly, which is multiple, and the multiple second E-type stator assemblies are arranged in an annular structure and are located on the side of the second auxiliary stator core assembly away from the permanent magnet assembly. The multiple second E-type stator assemblies cooperate with the second auxiliary stator core assembly to form multiple independent control magnetic circuits in the radial direction of the second stator assembly.

[0016] Furthermore, the second auxiliary stator core assembly includes: a second magnetic isolation frame, which is a ring-shaped structure, and a plurality of second installation notches are arranged at the outer edge of the second magnetic isolation frame; a second auxiliary stator core, which is multiple, and a second auxiliary stator core is arranged in each second installation notch, and the multiple second auxiliary stator cores are arranged one-to-one correspondingly to the multiple second E-type stator assemblies.

[0017] Furthermore, the second E-type stator assembly includes: a second E-type stator body, a plurality of second stator teeth are arranged on the inner circle of the second E-type stator body, and the radial width of at least one of the plurality of second stator teeth is set differently from the widths of the remaining second stator teeth.

[0018] Furthermore, the second E-type stator assembly includes: a second winding, a plurality of second windings, the plurality of second windings are respectively arranged on a plurality of second stator teeth, so that each second stator tooth is provided with a second winding, and at least one of the plurality of second windings is independently controlled from the remaining second windings.

[0019] Furthermore, the multiple second windings include at least one second main winding, and the rest are second auxiliary windings. When the second main winding fails, the second auxiliary winding starts to work to replace the second main winding. The second main winding and the remaining second auxiliary windings are independently controlled, and all the second auxiliary windings are arranged in series.

[0020] Furthermore, the permanent magnet assembly includes: a magnetic steel fixing frame, which is a ring-shaped structure, and is arranged in the middle of the shell. A plurality of magnetic steel mounting parts are opened at the outer edge of the magnetic steel fixing frame, and a permanent magnet is arranged in each of the plurality of magnetic steel mounting parts. The magnetic steel fixing frame is coaxially arranged with the first magnetic isolation frame, and the permanent magnets in the plurality of magnetic steel mounting parts are arranged one by one corresponding to the first auxiliary stator core.

[0021] Furthermore, the rotor assembly includes: an auxiliary rotor, which is arranged in the shell; a first conical rotor, which is arranged in the shell and abuts against the first end of the auxiliary rotor; a second conical rotor, which is arranged in the shell and abuts against the second end of the auxiliary rotor, and the rotating shaft passes through the first conical rotor, the auxiliary rotor and the second conical rotor in sequence.

[0022] Furthermore, the magnetic bearing assembly also includes: a first fixing plate connected to the end of the first end of the shell; and a second fixing plate connected to the end of the second end of the shell.

[0023] Further, the second stator assembly includes a second E-type stator assembly, the second E-type stator body of the second E-type stator assembly has three second stator teeth, the three second stator teeth are arranged at intervals along the inner circumference of the second E-type stator body, and the width of the middle second stator tooth is greater than the width of the other two second stator teeth, and / or, there are three first stator teeth, the three first stator teeth are arranged at intervals along the inner circumference of the first E-type stator body, and the width of the middle first stator tooth is greater than the width of the other two first stator teeth.

[0024] 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.

[0025] By applying the technical solution of the present invention, a permanent magnet assembly is arranged in the shell, a first stator assembly and a second stator assembly are arranged on both sides of the permanent magnet assembly, and the first stator assembly and the second stator assembly are arranged to generate an independently controlled magnetic field. Such an arrangement can avoid the problem of low stability of the magnetic bearing assembly caused by coupling between the first stator assembly and the second stator assembly during operation. Since the first stator assembly and the second stator assembly are arranged on both sides of the permanent magnet assembly, the axial length of the magnetic bearing assembly can be effectively shortened. The magnetic bearing assembly adopting this structure has a compact structure, can effectively shorten the axial length of the magnetic suspension, and the structure is simple and has good stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 A schematic cross-sectional view of a first embodiment of a magnetic bearing assembly according to the present invention is shown;

[0028] Figure 2 A schematic cross-sectional view of a second embodiment of a magnetic bearing assembly according to the present invention is shown;

[0029] Figure 3 A schematic cross-sectional view of a third embodiment of a magnetic bearing assembly according to the present invention is shown;

[0030] Figure 4 A schematic cross-sectional view of a fourth embodiment of a magnetic bearing assembly according to the present invention is shown;

[0031] Figure 5 An exploded structural schematic diagram of an embodiment of a magnetic bearing assembly according to the present invention is shown;

[0032] Figure 6 An exploded structural schematic diagram of an embodiment of a rotor assembly of a magnetic bearing assembly according to the present invention is shown;

[0033] Figure 7 A schematic diagram of force analysis of a rotating shaft of a magnetic bearing assembly according to the present invention in a first state is shown;

[0034] Figure 8 A schematic diagram of force analysis of a rotating shaft of a magnetic bearing assembly according to the present invention in a second state is shown;

[0035] Fig. 9 A schematic diagram of force analysis of a rotating shaft of a magnetic bearing assembly according to the present invention in a third state is shown;

[0036] Fig.10 A schematic diagram of force analysis of a rotating shaft of a magnetic bearing assembly according to the present invention in a fourth state is shown;

[0037] Fig.11 A schematic diagram of force analysis of a rotating shaft of a magnetic bearing assembly according to the present invention in a fifth state is shown;

[0038] Fig.12 A structural schematic diagram of an embodiment of a rotating shaft of a magnetic bearing assembly according to the present invention is shown.

[0039] The above drawings include the following reference numerals:

[0040] 10. Shell;

[0041] 20. Permanent magnet assembly; 21. Magnetic steel fixing frame; 22. Permanent magnet;

[0042] 30. First stator assembly; 31. First auxiliary stator core assembly; 311. First magnetic shielding frame; 312. First mounting notch; 313. First auxiliary stator core; 314. First magnetic shielding plate;

[0043] 32. First E-type stator assembly; 321. First E-type stator body; 322. First stator tooth; 323. First winding;

[0044] 40. Second stator assembly; 41. Second auxiliary stator core assembly; 411. Second magnetic shielding frame; 412. Second mounting notch; 413. Second auxiliary stator core; 414. Second magnetic shielding plate;

[0045] 42. Second E-type stator assembly; 421. Second E-type stator body; 422. Second stator teeth; 423. Second winding;

[0046] 50. rotor assembly; 51. rotating shaft; 52. auxiliary rotor; 53. first conical rotor; 54. second conical rotor;

[0047] 60. A first fixing plate;

[0048] 70. Second fixing plate;

[0049] 80. Precision nuts. DETAILED DESCRIPTION

[0050] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present 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.

[0051] 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] 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 can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations 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 that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0053] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present 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 the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0054] Combination Figures 1 to 12 As shown, according to a specific embodiment of the present application, a magnetic bearing assembly is provided.

[0055] Specifically, the magnetic bearing assembly includes a housing 10, a permanent magnet assembly 20, a first stator assembly 30, a second stator assembly 40 and a rotor assembly 50. The permanent magnet assembly 20 is arranged in the housing 10; the first stator assembly 30 is arranged in the housing 10 and is located on the first side of the permanent magnet assembly 20; the second stator assembly 40 is arranged in the housing 10 and is located on the second side of the permanent magnet assembly 20, and the second stator assembly 40 is arranged opposite to the first stator assembly 30; the rotor assembly 50 includes a rotating shaft 51, and the rotating shaft 51 is sequentially arranged in the first stator assembly 30, the permanent magnet assembly 20 and the second stator assembly 40; wherein the first stator assembly 30 and the second stator assembly 40 are used to generate independent control magnetic fields. The permanent magnet assembly 20 generates a bias magnetic field, and the control magnetic field is controlled by adjusting the bias magnetic field to control the rotating shaft 51 to make translational motion along the Y axis, rotation around the Y axis, translational motion along the X axis, rotation around the X axis and translational motion along the Z axis. The X axis and the Y axis are along the radial direction of the rotating shaft 51, and the Z axis is the axial direction of the rotating shaft 51.

[0056] In this embodiment, by arranging a permanent magnet assembly in the shell, arranging the first stator assembly 30 and the second stator assembly 40 on both sides of the permanent magnet assembly, and arranging the first stator assembly 30 and the second stator assembly 40 to generate an independently controlled magnetic field, such an arrangement can avoid the problem of low stability of the magnetic bearing assembly caused by coupling between the first stator assembly 30 and the second stator assembly 40 during operation. Since the first stator assembly 30 and the second stator assembly 40 are respectively arranged on both sides of the permanent magnet assembly, the axial length of the magnetic bearing assembly can be effectively shortened. The magnetic bearing assembly adopting this structure has a compact structure, a simple structure and good stability. Generally, the magnetic field generated by the permanent magnet is called a bias magnetic field, and the magnetic field generated by the winding is called a control magnetic field. The bias magnetic field in this application is only generated by the permanent magnet, but the magnetic field generated by the permanent magnet assembly will pass through the first stator assembly and the second stator assembly to form a bias magnetic field loop.

[0057] The first stator assembly 30 includes a first auxiliary stator core assembly 31 and a first E-type stator assembly 32. The first auxiliary stator core assembly 31 is arranged in the housing 10 and is located on the first side of the permanent magnet assembly 20. The plurality of first E-type stator assemblies 32 are used to generate an independent control magnetic field along the radial direction of the first stator assembly 30. Such an arrangement can separate the radial horizontal and vertical freedom control systems, so that the radial horizontal and vertical freedom control magnetic circuits are independently arranged, simplifying the radial freedom control logic and improving the stability and reliability of the radial control of the magnetic suspension bearing.

[0058] like Figures 1 to 5As shown, the first auxiliary stator core assembly 31 includes a first magnetic shielding frame 311 and a first auxiliary stator core 313. The first magnetic shielding frame 311 is an annular structure, and a plurality of first mounting notches 312 are arranged at the outer edge of the first magnetic shielding frame 311. There are a plurality of first auxiliary stator cores 313, and a first auxiliary stator core 313 is arranged in each first mounting notch 312. The plurality of first auxiliary stator cores 313 are arranged in a one-to-one correspondence with the plurality of first E-type stator assemblies 32. Such an arrangement can improve the installation stability of the first auxiliary stator core 313.

[0059] like Figure 3 and Figure 5 As shown, a plurality of first magnetic shielding plates 314 are arranged on the surface of the first magnetic shielding frame 311 facing the first E-type stator assembly 32, and an installation space for installing the first E-type stator assembly 32 is formed between adjacent first magnetic shielding plates 314. This arrangement can avoid magnetic leakage between adjacent first E-type stator assemblies 32, resulting in a chaotic magnetic circuit, and this arrangement can ensure that an independent control magnetic circuit can be formed between adjacent first E-type stator assemblies 32.

[0060] Specifically, the first E-type stator assembly 32 includes a first E-type stator body 321. A plurality of first stator teeth 322 are arranged on the inner circle of the first E-type stator body 321, and the width of at least one first stator tooth 322 in the plurality of first stator teeth 322 in the radial direction is set differently from the widths of the remaining first stator teeth 322. Such a setting can determine the number of turns of the winding wound on each first stator tooth 322 and the magnitude of the current passed therethrough according to the widths of different first stator teeth 322, thereby further improving the practicality of the magnetic bearing assembly.

[0061] Further, the first E-type stator assembly 32 includes a first winding 323. There are multiple first windings 323, and the multiple first windings 323 are respectively arranged on multiple first stator teeth 322, so that each first stator tooth 322 is provided with a first winding 323, and at least one of the multiple first windings 323 is independently controlled from the remaining first windings 323. Such an arrangement enables each first winding 323 to generate an independent control magnetic field, effectively avoiding the situation where coupling occurs between the first windings 323.

[0062] Among them, the multiple first windings 323 include at least one first main winding, and the rest are first auxiliary windings. When the first main winding fails, the first auxiliary winding starts to work to replace the main winding. The first main winding and the rest of the first auxiliary windings are independently controlled, and all the first auxiliary windings are arranged in series. Such an arrangement can improve the stability and reliability of the magnetic suspension bearing assembly.

[0063] In one embodiment of the present application, the central angles corresponding to the profile lines of the outer circumferential surfaces of adjacent first E-shaped stator bodies 321 may be set in different ways.

[0064] Specifically, the second stator assembly 40 includes a second auxiliary stator core assembly 41 and a second E-type stator assembly 42. The second auxiliary stator core assembly 41 is disposed in the housing 10 and is located on the second side of the permanent magnet assembly 20. There are multiple second E-type stator assemblies 42, and the multiple second E-type stator assemblies 42 are arranged in an annular structure and are located on the side of the second auxiliary stator core assembly 41 away from the permanent magnet assembly 20. The multiple second E-type stator assemblies 42 cooperate with the second auxiliary stator core assembly 41 to form multiple independent control magnetic circuits in the radial direction of the second stator assembly 40. The second side of the permanent magnet assembly 20 is arranged opposite to the first side of the permanent magnet assembly 20 mentioned above.

[0065] Among them, the second auxiliary stator core assembly 41 includes a second magnetic isolation frame 411 and a second auxiliary stator core 413. The second magnetic isolation frame 411 is an annular structure, and a plurality of second installation notches 412 are arranged at the outer edge of the second magnetic isolation frame 411. There are a plurality of second auxiliary stator cores 413, and a second auxiliary stator core 413 is arranged in each second installation notch 412. The plurality of second auxiliary stator cores 413 are arranged one-to-one with the plurality of second E-type stator assemblies 42. Such an arrangement can improve the installation reliability of the second auxiliary stator core 413.

[0066] Specifically, the second E-type stator assembly 42 includes a second E-type stator body 421 and a second winding 423. A plurality of second stator teeth 422 are arranged on the inner circle of the second E-type stator body 421, and the width of at least one second stator tooth 422 in the radial direction among the plurality of second stator teeth 422 is set differently from the widths of the remaining second stator teeth 422. There are a plurality of second windings 423, and the plurality of second windings 423 are respectively arranged on the plurality of second stator teeth 422, so that each second stator tooth 422 is provided with a second winding 423, and at least one of the plurality of second windings 423 is controlled independently from the remaining second windings 423. The plurality of second windings 423 include at least one second main winding, and the rest are second auxiliary windings. When the second main winding fails, the second auxiliary winding starts to work to replace the second main winding. The second main winding is independently controlled from the remaining second auxiliary windings, and all the second auxiliary windings are arranged in series. This arrangement enables each winding to generate an independent control magnetic field, effectively avoiding coupling between windings. The arrangement of the auxiliary winding and the main winding enables the auxiliary winding to replace the main winding when the main winding fails, further improving the reliability and stability of the magnetic bearing assembly.

[0067] In another embodiment of the present application, the central angles corresponding to the profile lines of the outer circumferential surfaces of the adjacent second E-shaped stator bodies 421 may be set in different ways.

[0068] like Figure 5 As shown, the permanent magnet assembly 20 includes a magnetic steel fixing frame 21. The magnetic steel fixing frame 21 is an annular structure, and the magnetic steel fixing frame 21 is arranged in the middle of the housing 10. A plurality of magnetic steel mounting portions 211 are provided at the outer edge of the magnetic steel fixing frame 21, and a permanent magnet 22 is arranged in each of the plurality of magnetic steel mounting portions 211. The magnetic steel fixing frame 21 is coaxially arranged with the first magnetic isolation frame 311, and the permanent magnets 22 in the plurality of magnetic steel mounting portions 211 are arranged one by one corresponding to the first auxiliary stator core 313. Such an arrangement can improve the installation stability of the permanent magnet 22.

[0069] The rotor assembly 50 includes an auxiliary rotor 52, a first conical rotor 53, and a second conical rotor 54. The auxiliary rotor 52 is disposed in the housing 10. The first conical rotor 53 is disposed in the housing 10 and abuts against a first end of the auxiliary rotor 52. The second conical rotor 54 is disposed in the housing 10 and abuts against a second end of the auxiliary rotor 52, and the rotating shaft 51 passes through the first conical rotor 53, the auxiliary rotor 52, and the second conical rotor 54 in sequence. Such an arrangement can improve the stability of the magnetic bearing assembly.

[0070] In order to further improve the stability of the magnetic bearing, the magnetic bearing assembly further includes a first fixing plate 60 and a second fixing plate 70. The first fixing plate 60 is connected to the end of the first end of the housing 10. The second fixing plate 70 is connected to the end of the second end of the housing 10.

[0071] In another embodiment of the present application, the second stator assembly 40 includes a second E-type stator assembly 42. The second E-type stator body 421 of the second E-type stator assembly 42 has three second stator teeth 422. The three second stator teeth 422 are arranged at intervals along the inner circumference of the second E-type stator body 421. The width of the second stator tooth 422 located in the middle is greater than the width of the remaining two second stator teeth 422. There are three first stator teeth 322, and the three first stator teeth 322 are arranged at intervals along the inner circumference of the first E-type stator body 321, and the width of the first stator tooth 322 located in the middle is greater than the width of the remaining two first stator teeth 322. This arrangement can set the winding on the middle stator tooth as the main winding, further improving the stability of the magnetic bearing assembly. In this embodiment, the second stator assembly 40 includes four, six or eight second E-shaped stator assemblies 42 , and the number of the first E-shaped stator bodies 321 is four, six or eight.

[0072] In another embodiment of the present application, a magnetic bearing assembly is provided. The magnetic bearing assembly includes a first stator assembly 30. The first stator assembly 30 includes a first auxiliary stator core assembly 31 and a first E-type stator assembly 32. There are multiple first E-type stator assemblies 32, and the multiple first E-type stator assemblies 32 are arranged in an annular structure and are located on one side of the first auxiliary stator core assembly 31. The multiple first E-type stator assemblies 32 cooperate with the first auxiliary stator core assembly 31 to form multiple independent control magnetic circuits in the radial direction of the first stator assembly 30.

[0073] In this embodiment, multiple first E-type stator assemblies 32 are arranged to cooperate with the first auxiliary stator core assembly 31, and multiple independent control magnetic circuits are formed in the radial direction of the first stator assembly 30. This arrangement can avoid the problem of low reliability of the magnetic suspension assembly caused by coupling between multiple first E-type stator assemblies 32. At the same time, the structure of the magnetic suspension bearing assembly using this structure is compact, which can shorten the axial height of the magnetic suspension bearing assembly and improve the stability and reliability of the magnetic suspension assembly.

[0074] Specifically, in the present embodiment, the first auxiliary stator core assembly 31 includes a first magnetic shielding frame 311 and a first auxiliary stator core 313. The first magnetic shielding frame 311 is an annular structure, and a plurality of first installation notches 312 are arranged at the outer edge of the first magnetic shielding frame 311. There are a plurality of first auxiliary stator cores 313, and a first auxiliary stator core 313 is arranged in each first installation notch 312, and the plurality of first auxiliary stator cores 313 are arranged one-to-one corresponding to the plurality of first E-type stator assemblies 32. A plurality of first magnetic shielding plates 314 are arranged on the surface of the first magnetic shielding frame 311 facing the first E-type stator assembly 32, and an installation space for installing the first E-type stator assembly 32 is formed between adjacent first magnetic shielding plates 314. Such an arrangement can improve the stability and reliability of the first auxiliary stator core assembly 31.

[0075] Further, the first E-type stator assembly 32 includes a first E-type stator body 321 and a first winding 323. A plurality of first stator teeth 322 are arranged on the inner circle of the first E-type stator body 321, and the width of at least one of the plurality of first stator teeth 322 in the radial direction is set differently from the width of the remaining first stator teeth 322. There are a plurality of first windings 323, and the plurality of first windings 323 are respectively arranged on the plurality of first stator teeth 322, so that each first stator tooth 322 is provided with a first winding 323, and the plurality of first windings 323 are independently controlled. Such a setting can realize the control of each winding individually, for example, when one of the windings fails, the current connected to the other windings can be controlled to increase to ensure that the shaft is always in a stable state of rotation. Preferably, at least one first main winding is included in the plurality of first windings 323, and the rest are first auxiliary windings. When the first main winding fails, the first auxiliary winding starts to work to replace the main winding.

[0076] A groove is provided on the side wall of the first magnetic shielding frame 311 forming the first installation notch 312, and the groove is extended along the radial direction of the first magnetic shielding frame 311. A limiting protrusion matching the groove is provided on the side of the first auxiliary stator core 313. Such a setting can improve the installation stability of the first auxiliary stator core 313.

[0077] A first magnetic shielding plate 314 is disposed on the first magnetic shielding frame 311 between adjacent first mounting notches 312. This arrangement enables the first E-shaped stator body 321 between the first magnetic shielding plates 314 to cooperate with the winding to form an independent control magnetic field, further improving the stability of the magnetic suspension assembly.

[0078] Further, the magnetic bearing assembly also includes a housing 10. A permanent magnet assembly 20 is arranged in the middle of the housing 10, and a first auxiliary stator core assembly 31 is arranged in the housing 10 and located on the first side of the permanent magnet assembly 20. The second stator assembly 40 is arranged in the housing 10 and located on the second side of the permanent magnet assembly 20, and the second stator assembly 40 is arranged opposite to the first stator assembly 30. The rotor assembly 50 includes a rotating shaft 51, an auxiliary rotor 52, a first conical rotor 53 and a second conical rotor 54, and the rotating shaft 51 is sequentially arranged in the first conical rotor 53, the auxiliary rotor 52 and the second conical rotor 54, and the auxiliary rotor 52 is arranged in cooperation with the permanent magnet assembly 20, the first stator assembly 30 and the second stator assembly 40, and the first conical rotor 53 is arranged in cooperation with a part of the first stator assembly 30, and the second conical rotor 54 is arranged in cooperation with a part of the second stator assembly 40. Among them, the first stator assembly 30 and the second stator assembly 40 are used to generate independent control magnetic fields, and the permanent magnet assembly 20 generates a bias magnetic field. The control magnetic field controls the rotating shaft 51 to make a translational motion along the Y axis or rotate around the Y axis by adjusting the bias magnetic field, or controls the rotating shaft 51 to rotate around the X axis or make a translational motion along the X axis, or controls the rotating shaft 51 to make a translational motion along the Z axis. The X axis and the Y axis are along the radial direction of the rotating shaft 51, and the Z axis is the axial direction of the rotating shaft 51. Such a setting enables the magnetic suspension assembly to achieve five-degree-of-freedom control of the rotating shaft, further improving the stability and reliability of the magnetic suspension assembly.

[0079] 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, and the magnetic bearing assembly is the magnetic bearing assembly in the above embodiment.

[0080] 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 magnetic offset bearing, complex 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 decoupled five-degree-of-freedom magnetic suspension bearing assembly. Fig.12 As shown, the rotating shaft 51 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).

[0081] like Figure 2As shown, the rotating shaft 51, the first conical rotor 53, the second conical rotor 54, the first auxiliary stator core 313, the second auxiliary stator core 413, the permanent magnet 22, the second stator teeth 422, the second conical rotor 54, the auxiliary rotor 52, the first magnetic isolation plate 314, the second magnetic isolation plate 414, and the first winding 323 constitute a five-degree-of-freedom suspension system to achieve five-degree-of-freedom directional control of the rotating shaft. The permanent magnet 22 generates a bias magnetic field, and a closed loop is formed through the first auxiliary stator core 313, the second auxiliary stator core 413, the first stator tooth 322, the second stator tooth 422, the auxiliary rotor 52, the first conical rotor 53, and the second conical rotor 54 to form a front and rear radial-axial bias magnetic field C1, and a bias magnetic flux is formed in the main air gap between the first stator tooth 322 and the first conical rotor 53 and between the second stator tooth 422 and the second conical rotor 54. The radial-axial control winding generates a control magnetic field, and a closed loop is formed through the main magnetic pole, the stator, the two auxiliary magnetic poles at the side ends, and the rotor to form a horizontal radial. The radial-axial control magnetic field C2 is formed in the same way as the vertical radial-axial control magnetic field C3. The radial-axial control main winding is the main control winding. When the shaft is offset in different degrees of freedom, the main winding is used for control. When the main winding fails, the radial-axial secondary windings on the auxiliary magnetic poles on both sides of the main winding are started to realize the control of different degrees of freedom of the shaft. The horizontal radial-axial control magnetic field C2 and the vertical radial-axial control magnetic field C3 are set independently of each other and are not coupled to each other, so as to realize the independent horizontal and vertical control of the shaft radial direction, thereby simplifying the control logic of the magnetic suspension system and improving the stability and reliability of the system. The front and rear radial bearing stators adopt an integrated structure, and the axial-radial degree of freedom control uses the conical magnetic pole output to reduce the extra space occupied by the axial bearing, thereby reducing the axial utilization space of the magnetic suspension system, shortening the shaft length, reducing flexibility, reducing control components, and low material cost of the magnetic suspension system.

[0082] like Figure 1 , Figures 7 to 12 As shown, the left side of the figure is defined as the front end of the magnetic bearing assembly, and the right side is the rear end of the magnetic bearing assembly. F1, F2, F3, and F4 are the output models of the magnetic poles of the front radial horizontal-axial stator and the rear radial horizontal-axial stator on the rotating shaft, and f1, f2, f3, and f4 are the output models of the magnetic poles of the front radial vertical-axial stator and the rear radial vertical-axial stator on the rotating shaft. Figure 7 , Figure 8 As shown in the figure, it is the force model of the shaft when the shaft is in the equilibrium position. At this time, F1=F2=F3=F4=f1=f2=f3=f4, and the resultant force on the shaft is zero. Among them, when the shaft is subjected to radial horizontal impact, the shaft deflects downward, as shown in Figure 3As shown, the shaft moves downward, the gap between the front and rear radial-axial rotors (first conical rotor 53, second conical rotor 54) and the upper ends of the front and rear radial-axial stators (first auxiliary stator core 313, second auxiliary stator core 413) increases, the bias flux of the front and rear gap-axial bias magnetic field C1 at the upper air gap decreases, the gap at the lower end decreases, and the bias flux increases. When the pole area is constant, the magnetic field suction force is proportional to the square of the magnetic flux, and the downward suction force is greater than the upward suction force. Without external interference, the shaft will continue to deviate downward and cannot return to the equilibrium position. The same control current is passed through the front and rear radial horizontal-axial control main windings to generate a control magnetic field, adjust the flux size at the front and rear gaps, and make the shaft force model as shown in the figure. Fig. 9 As shown, the radial horizontal force is F1=F3>F2=F4, and the radial vertical force is f1=f2=f3=f4. The shaft will move upward in the radial horizontal direction until it returns to the equilibrium position. The control winding stops passing the control current. At the equilibrium position, the shaft force is restored. Figure 7 , 8 As shown, similarly, when an impact occurs in the radial vertical direction of the shaft, the shaft control principle is the same as the radial horizontal control principle. When the shaft is impacted and rotates counterclockwise around the Y-axis (radial horizontal), the gap between the first conical rotor 53 and the upper end of the first auxiliary stator core 313 increases, the bias magnetic flux decreases, the gap at the lower end decreases, the bias magnetic flux increases, the suction force at the lower end is greater than the suction force at the upper end, and the left end of the shaft moves downward. Similarly, the upward suction force generated at the right end of the shaft is greater than the downward suction force, and the right end of the shaft moves upward. Without external interference, the shaft will continue to rotate counterclockwise. Opposite control currents are passed through the front and rear radial horizontal-axial control main windings to generate a control magnetic field, which adjusts the size of the magnetic flux at the front and rear gaps so that the shaft force model is as follows: Fig.10 As shown, the radial horizontal force F1=F4>F2=F3, and the radial vertical force f1=f2=f3=f4, the shaft will rotate clockwise around the Y axis until the equilibrium position is restored, and the control winding is stopped from being energized. Similarly, when the shaft undergoes a rotation impact around the X axis, the control principle is the same. When the shaft undergoes an axial displacement and impacts to the left, the gap between the shaft and the stator at the left end of the shaft increases, and the magnetic flux decreases. The gap between the shaft and the stator at the right end decreases, and the magnetic flux increases. The total suction force at the right end is greater than the total suction force at the left end, and the shaft will continue to move to the left and cannot be restored. The main windings on the four poles of the first auxiliary stator core 313 are passed through control currents of equal magnitude and different directions to increase the suction force of the stator on the shaft (F1, F2, f1, f2 increase), and the main windings on the four poles of the second auxiliary stator core 413 are passed through control currents of equal magnitude and different directions to reduce the suction force of the stator on the rotor (F3, F4, f3, f4 decrease). Fig.11 As shown, (F1=F2=f1=f2>F3=F4=f3=f4), the shaft will move to the right end until the balance is restored, and the control winding will stop being energized, thereby realizing the control of the axial freedom of the shaft.

[0083] The use of the magnetic levitation bearing assembly of the present application solves the problems in the prior art of the parallel arrangement of double radial bearings and axial bearings, which leads to a large axial span of the magnetic levitation system, a long rotating shaft length, high flexibility, a large number of control components, and a high material cost of the magnetic levitation system. It also solves the problems in the prior art of the radial horizontal and vertical degrees of freedom control magnetic circuit coupling, complex control logic, single control winding, and low control system reliability of the magnetic levitation assembly.

[0084] The magnetic suspension bearing assembly of the present application adopts a dual radial bearing-axial bearing integrated structure, and the axial-radial freedom shares a conical magnetic pole output control. This makes the entire magnetic suspension system have a small axial space, a short shaft length, low flexibility, and a common set of axial-radial control components, which reduces the number of components used and reduces the material cost of the magnetic suspension system.

[0085] The dual radial integrated structure and dual radial magnetic poles realize four-degree-of-freedom suspension of the rotating shaft. The edge effect of the magnetic poles is used to realize axial control of the rotating shaft and five-degree-of-freedom suspension of the rotating shaft, which reduces the number of components and saves the cost of axial bearing materials and occupied space. The main and auxiliary control windings are wound on the main and auxiliary magnetic poles of the E-pole magnetic pole to achieve radial-axial freedom multi-winding control, avoiding the uncontrolled state of the magnetic suspension system when a single winding control failure occurs, thereby improving the stability and reliability of the magnetic suspension system.

[0086] Among them, the axial and radial degrees of freedom share the conical magnetic pole, and the output of the conical magnetic pole can control the suspension control of the five degrees of freedom of the rotating shaft, so that the radial degree of freedom control and the axial degree of freedom control share a set of control elements to reduce the axial space occupied by the magnetic suspension, make the rotating shaft short and less flexible, reduce the number of components, and save material costs.

[0087] like Figure 3 and Figure 4 As shown, the double radial integrated structure and the double radial magnetic poles realize four-degree-of-freedom suspension of the rotating shaft. The edge effect of the magnetic poles is used to realize axial control of the rotating shaft, realize five-degree-of-freedom suspension of the rotating shaft, reduce the number of components, and save the cost of axial bearing materials and occupied space.

[0088] The E-type magnetic pole structure separates the radial horizontal and vertical freedom control systems, and controls the magnetic fields to be uncoupled and independent of each other, thereby simplifying the control logic of the radial freedom and improving the stability of the magnetic levitation system.

[0089] The main and auxiliary magnetic poles of the E-pole magnetic pole are wound around the main and auxiliary control windings to achieve radial-axial freedom multi-winding control. The main magnetic poles and the auxiliary magnetic poles are independent of each other. When a main control winding fails, the auxiliary control windings on both sides are connected with corresponding control currents to generate a control magnetic field with the same function as the main control winding, exercise corresponding control functions, and improve the reliability of the magnetic levitation system.

[0090] like Figure 1 and Figure 5 As shown, the components for realizing the five-degree-of-freedom control of the rotating shaft are composed of the rotating shaft 1, the auxiliary rotor 52, the first conical rotor 53, the precision nut 80, the second conical rotor 54, the first fixing plate 60, the second fixing plate 70, the first winding 323 (including the main winding and the auxiliary winding), the first E-type stator body 321, the first auxiliary stator core 313, the second auxiliary stator core 413, the first magnetic isolation frame 311, the second magnetic isolation frame 411, the housing 10, the permanent magnet 22, the magnetic steel fixing frame 21, the second winding 423 (including the main winding and the auxiliary winding), and the second E-type stator body 421. The permanent magnet 22 is a fan-shaped structure, which is embedded in the magnetic steel fixing frame 21 by gluing, and the magnetic steel fixing frame 21 is installed in the housing 10 by shrink-fitting. There is a convex step in the housing 10 to axially position the magnetic steel fixing frame to realize the fixed installation of the permanent magnet 22. The magnetic isolation frame (first magnetic isolation frame, second magnetic isolation frame) used for fixing the core fixes the first auxiliary stator core 313 and the second auxiliary stator core 413 through a gluing process, and the four magnetic isolation plates on the side isolate and fix the four segmented radial stators. The magnetic isolation frame used for fixing the core is installed on both sides of the stator housing by a shrink fit method, and the first auxiliary stator core 313 and the second auxiliary stator core 413 are aligned and assembled with the fan-shaped permanent magnet. There are micro bosses at both ends of the first auxiliary stator core 313 and the second auxiliary stator core 413, which are docked with the magnetic steel fixing frame to achieve fixed installation of the auxiliary stator core. The main winding in the first winding and the main winding in the second winding are respectively installed on the main magnetic poles of the first E-type stator body and the second E-type stator body by binding and gluing. The four main control windings are independently arranged. The auxiliary winding in the first winding and the auxiliary winding in the second winding are respectively wound on the auxiliary magnetic poles of the first E-type stator body and the second E-type stator body. The auxiliary windings on both sides of each main magnetic pole are arranged in series to form a block-type stator assembly. The block-type stator assembly is installed on the fixed magnetic isolation frame in the shell by heat-shrink fitting. The radial positioning is performed by the four convex magnetic isolation plates of the magnetic isolation frame. The axial positioning of the block-type stator assembly is performed by the fixed plate. The above process completes the installation and fixation of the stator assembly of the magnetic suspension bearing assembly. The auxiliary rotor is installed from the left end of the shaft by shrink fitting. There is a micro-boss on the shaft to axially position the auxiliary rotor. The first conical rotor 53 is shrink fitted on the left end of the shaft 51. The end face of the first conical rotor 53 is precisely fitted with the end face of the auxiliary rotor 52. The first conical rotor 53 is axially fixed and installed by the precision nut 80 to form a rotor assembly. The rotor assembly is inserted into the shaft from the left end of the stator assembly. The second conical rotor 54 is shrink fitted from the right end of the shaft 51. The left end face of the second conical rotor 54 is precisely fitted with the right end face of the auxiliary rotor 52. The second conical rotor 54 is fixed and installed by the precision nut 80, thereby completing the installation and implementation of the entire five-degree-of-freedom magnetic suspension system.

[0091] The first E-shaped stator body 321, the second E-shaped stator body 421 and the first conical rotor 53, the second conical rotor 54 generate the following Figures 7 to 11 The magnetic forces F1, F2, F3, F4, f1, f2, f3, and f4 can respectively regulate the suspension of the four degrees of freedom in the radial direction of the rotating shaft and the suspension control of the axial degree of freedom. The permanent magnet 22 generates a bias magnetic field, and a closed loop is formed through the auxiliary stator core on the left and right sides of the permanent magnet 22, the first conical rotor 53, the second conical rotor 54, the first E-type stator body 321, the second E-type stator body 421, and the auxiliary rotor 52, forming a bias magnetic field of the same polarity, and forming a bias magnetic flux between the E-pole conical stator and the conical rotor. The main winding is passed through a control current to form a control magnetic field, which forms a closed loop through the main magnetic pole, the auxiliary magnetic pole and the conical rotor (the first conical rotor 53 and the second conical rotor 54), forming a control magnetic field of different polarity, and by adjusting the bias magnetic flux between the stator and the rotor, the suspension control of the five degrees of freedom of the rotating shaft is realized. The conical magnetic pole realizes a radial-axial integrated structure, reduces the axial space used by the magnetic suspension system, reduces the number of control components, and reduces material costs. The E-pole magnetic pole structure is adopted to realize independent control of radial horizontal and vertical degrees of freedom, decouple the magnetic circuit, simplify the control logic, and improve the stability of the system. There are two auxiliary control windings on the auxiliary magnetic pole of the E-pole magnetic pole. When the main control winding fails, the auxiliary control winding can realize the same control function as the main control winding, forming a multi-winding control system and improving the reliability of the magnetic suspension system.

[0092] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. 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 figure. For example, if the device in the accompanying 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.

[0093] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0094] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A magnetic bearing assembly, characterized in that: include: Housing (10); A permanent magnet assembly (20), wherein the permanent magnet assembly (20) is arranged in the housing (10); A first stator assembly (30), the first stator assembly (30) being arranged on the housing (10) and located on a first side of the permanent magnet assembly (20); a second stator assembly (40), the second stator assembly (40) being arranged in the housing (10) and located on a second side of the permanent magnet assembly (20), the second stator assembly (40) being arranged opposite to the first stator assembly (30); A rotor assembly (50), the rotor assembly (50) comprising a rotating shaft (51), the rotating shaft (51) being sequentially disposed in the first stator assembly (30), the permanent magnet assembly (20), and the second stator assembly (40); The first stator assembly (30) and the second stator assembly (40) are used to generate independent control magnetic fields, and the permanent magnet assembly (20) generates a bias magnetic field. The control magnetic field controls the rotating shaft (51) 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 by adjusting the bias magnetic field. The X axis and the Y axis are along the radial direction of the rotating shaft (51), and the Z axis is the axial direction of the rotating shaft (51).

2. The magnetic bearing assembly according to claim 1, characterized in that: The first stator assembly (30) comprises: a first auxiliary stator core assembly (31), the first auxiliary stator core assembly (31) being arranged in the housing (10) and located on a first side of the permanent magnet assembly (20); A first E-type stator component (32), wherein the first E-type stator components (32) are multiple, the multiple first E-type stator components (32) are arranged in an annular structure and are located on a side of the first auxiliary stator core component (31) away from the permanent magnet component (20), and the multiple first E-type stator components (32) cooperate with the first auxiliary stator core component (31) to form multiple independent control magnetic circuits in the radial direction of the first stator component (30).

3. The magnetic bearing assembly according to claim 2, characterized in that: The first auxiliary stator core assembly (31) comprises: A first magnetic isolation frame (311), wherein the first magnetic isolation frame (311) is an annular structure, and a plurality of first installation notches (312) are arranged at the outer edge of the first magnetic isolation frame (311); A first auxiliary stator core (313), wherein the first auxiliary stator core (313) is multiple, and one of the first auxiliary stator cores (313) is arranged in each of the first mounting notches (312), and the multiple first auxiliary stator cores (313) are arranged in a one-to-one correspondence with the multiple first E-type stator assemblies (32).

4. The magnetic bearing assembly according to claim 3, characterized in that: A plurality of first magnetic isolation plates (314) are arranged on the surface of the first magnetic isolation frame (311) facing the first E-type stator assembly (32), and an installation space for installing the first E-type stator assembly (32) is formed between adjacent first magnetic isolation plates (314).

5. The magnetic bearing assembly according to claim 2, characterized in that: The first E-type stator assembly (32) comprises: A first E-type stator body (321), wherein a plurality of first stator teeth (322) are arranged on the inner circle of the first E-type stator body (321), and the width in the radial direction of at least one of the plurality of first stator teeth (322) is arranged differently from the widths of the remaining first stator teeth (322).

6. The magnetic bearing assembly according to claim 5, characterized in that: The first E-type stator assembly (32) comprises: A first winding (323), wherein there are a plurality of first windings (323), and the plurality of first windings (323) are respectively arranged on a plurality of first stator teeth (322), so that each first stator tooth (322) is provided with a first winding (323), and at least one of the plurality of first windings (323) is independently controlled from the remaining first windings (323).

7. The magnetic bearing assembly according to claim 6, characterized in that: The plurality of first windings (323) include at least one first main winding, and the rest are first auxiliary windings. When the first main winding fails, the first auxiliary winding starts to operate to replace the main winding. The first main winding and the rest of the first auxiliary windings are independently controlled, and all of the first auxiliary windings are arranged in series.

8. The magnetic bearing assembly according to claim 1, characterized in that: The second stator assembly (40) comprises: a second auxiliary stator core assembly (41), the second auxiliary stator core assembly (41) being arranged in the housing (10) and located on a second side of the permanent magnet assembly (20); A second E-type stator assembly (42), wherein the second E-type stator assembly (42) is multiple, and the multiple second E-type stator assemblies (42) are arranged in an annular structure and are located on a side of the second auxiliary stator core assembly (41) away from the permanent magnet assembly (20). The multiple second E-type stator assemblies (42) cooperate with the second auxiliary stator core assembly (41) to form multiple independent control magnetic circuits in the radial direction of the second stator assembly (40).

9. The magnetic bearing assembly according to claim 8, characterized in that: The second auxiliary stator core assembly (41) comprises: A second magnetic isolation frame (411), the second magnetic isolation frame (411) is an annular structure, and a plurality of second installation notches (412) are provided at the outer edge of the second magnetic isolation frame (411); A second auxiliary stator core (413), wherein the second auxiliary stator core (413) is multiple, and a second auxiliary stator core (413) is arranged in each of the second mounting notches (412), and the multiple second auxiliary stator cores (413) are arranged in a one-to-one correspondence with the multiple second E-type stator assemblies (42).

10. The magnetic bearing assembly according to claim 8, characterized in that: The second E-type stator assembly (42) comprises: A second E-type stator body (421), wherein a plurality of second stator teeth (422) are arranged on the inner circle of the second E-type stator body (421), and the radial width of at least one of the plurality of second stator teeth (422) is set differently from the widths of the remaining second stator teeth (422).

11. The magnetic bearing assembly according to claim 10, characterized in that: The second E-type stator assembly (42) comprises: A second winding (423), wherein there are a plurality of second windings (423), and the plurality of second windings (423) are respectively arranged on a plurality of second stator teeth (422), so that each second stator tooth (422) is provided with a second winding (423), and at least one of the plurality of second windings (423) is independently controlled from the remaining second windings (423).

12. The magnetic bearing assembly according to claim 11, characterized in that: The plurality of second windings (423) include at least one second main winding, and the rest are second auxiliary windings. When the second main winding fails, the second auxiliary winding starts to operate to replace the second main winding. The second main winding and the rest of the second auxiliary windings are independently controlled, and all of the second auxiliary windings are arranged in series.

13. The magnetic bearing assembly according to claim 3, characterized in that: The permanent magnet assembly (20) comprises: A magnetic steel fixing frame (21), the magnetic steel fixing frame (21) is an annular structure, the magnetic steel fixing frame (21) is arranged in the middle of the shell (10), a plurality of magnetic steel mounting parts (211) are provided at the outer edge of the magnetic steel fixing frame (21), a permanent magnet (22) is arranged in each of the plurality of magnetic steel mounting parts (211), the magnetic steel fixing frame (21) is coaxially arranged with the first magnetic isolation frame (311), and the permanent magnets (22) in the plurality of magnetic steel mounting parts (211) are arranged in a one-to-one correspondence with the first auxiliary stator core (313).

14. The magnetic bearing assembly according to claim 1, characterized in that: The rotor assembly (50) comprises: an auxiliary rotor (52), the auxiliary rotor (52) being disposed in the housing (10); a first conical rotor (53), the first conical rotor (53) being disposed on the housing (10) and abutting against a first end of the auxiliary rotor (52); A second conical rotor (54), the second conical rotor (54) is arranged in the housing (10) and abuts against the second end of the auxiliary rotor (52), and the rotating shaft (51) passes through the first conical rotor (53), the auxiliary rotor (52) and the second conical rotor (54) in sequence.

15. The magnetic bearing assembly according to claim 1, characterized in that: The magnetic bearing assembly also includes: A first fixing plate (60), the first fixing plate (60) being connected to an end portion of a first end of the housing (10); A second fixing plate (70), the second fixing plate (70) is connected to an end portion of a second end of the shell (10).

16. The magnetic bearing assembly according to claim 5, characterized in that: The second stator assembly (40) comprises a second E-type stator assembly (42), the second E-type stator body (421) of the second E-type stator assembly (42) having three second stator teeth (422), the three second stator teeth (422) being arranged at intervals along the inner circumference of the second E-type stator body (421), the width of the second stator tooth (422) located in the middle being greater than the widths of the other two second stator teeth (422), and / or the number of the first stator teeth (322) is three, the three first stator teeth (322) being arranged at intervals along the inner circumference of the first E-type stator body (321), the width of the first stator tooth (322) located in the middle being greater than the widths of the other two first stator teeth (322).

17. 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 16.

18. 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 16.

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