Magnetic bearing components, motors and compressors

Abstract

The present invention provides a magnetic bearing assembly, a motor and a compressor. The magnetic bearing assembly includes: a shell core is provided with a rotating shaft; an axial stator assembly is arranged in the shell core along the outer peripheral side of the thrust plate of the rotating shaft; a first stator assembly, the first stator assembly is arranged in the shell core and is located on the first side of the axial stator assembly; a second stator assembly, the second stator assembly is arranged in the shell core and is located on the second side of the axial stator assembly, and the second stator assembly is arranged opposite to the first stator assembly; wherein the first stator assembly and the second stator assembly are used to generate independent radial control magnetic fields, and the axial stator assembly is used to generate a control magnetic field along the axial direction of the rotating shaft. 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.

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] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a magnetic bearing assembly is provided, comprising: a shell core, the shell core is provided with a rotating shaft; an axial stator assembly, part of which is arranged in the shell core along the outer peripheral side of the thrust plate of the rotating shaft; a first stator assembly, the first stator assembly is arranged in the shell core and is located on the first side of the axial stator assembly; a second stator assembly, the second stator assembly is arranged in the shell core and is located on the second side of the axial stator assembly, and the second stator assembly is arranged opposite to the first stator assembly; wherein the first stator assembly and the second stator assembly are used to generate independent radial control magnetic fields, and the axial stator assembly is used to generate a control magnetic field along the axial direction of the rotating shaft.

[0009] Further, the axial stator assembly includes: a first axial iron core, the first axial iron core is arranged in the outer shell iron core, and the first axial iron core has a first annular receiving groove; a second axial iron core, the second axial iron core is arranged in the outer shell iron core, and the second axial iron core has a second annular receiving groove, the first axial iron core and the second axial iron core are arranged relative to each other so that the first annular receiving groove and the second annular receiving groove form an annular receiving cavity on the outer peripheral side of the thrust plate; an axial winding assembly, and the direction of the access current of the axial winding assembly is adjustably set.

[0010] Furthermore, the axial winding assembly includes: a support frame, the outer circumferential surface of the support frame is provided with a plurality of mounting grooves; a winding coil, each mounting groove is provided with a winding coil.

[0011] Further, the first axial iron core includes: a first annular body, a first annular tooth portion is arranged on the inner circumferential surface of the first annular body close to the thrust plate, an outer circle of the first annular tooth portion and an inner circle of the first annular body are arranged at a distance to form a first annular accommodating groove, an end of the first annular tooth portion extends toward the second stator assembly, and the end of the first annular tooth portion is arranged opposite to the surface of the thrust plate on the side facing the first stator assembly.

[0012] Further, the second axial iron core includes: a second annular body, a second annular tooth portion is arranged on the inner circumferential surface of the second annular body close to the thrust plate, an outer circle of the second annular tooth portion and an inner circle of the second annular body are arranged at a distance to form a second annular accommodating groove, an end of the second annular tooth portion extends toward the first stator assembly, and an end of the second annular tooth portion is arranged opposite to the surface of the thrust plate on the side facing the second stator assembly; wherein the end of the second annular body is arranged in abutment with the end of the first annular body so that a space for accommodating the thrust plate is formed between the first annular body and the second annular body.

[0013] Furthermore, the magnetic bearing assembly also includes: a permanent magnet, which is arranged in the outer shell core, and the permanent magnet is a fan-shaped structure. The permanent magnet is arranged along the circumference of the outer shell core, and there are multiple permanent magnets, and the multiple permanent magnets are arranged at intervals between the axial stator assembly and the outer shell core.

[0014] Furthermore, the first stator assembly includes: a first fixing frame, the first fixing frame is an annular structure, the first fixing frame is arranged in the outer shell core, and a plurality of first positioning plates are arranged at one end of the first fixing frame facing the second stator assembly, the plurality of first positioning plates are arranged at intervals, and a first positioning groove for installing a permanent magnet is formed between adjacent first positioning plates.

[0015] Furthermore, the first stator assembly also includes: a first E-type stator body, the first E-type stator bodies are multiple, the multiple first E-type stator bodies are arranged in the outer shell core along the circumference of the first fixed frame, the multiple first E-type stator bodies are located at one end of the first fixed frame away from the second stator assembly, and each first E-type stator body is provided with at least one independently controlled first winding coil.

[0016] Furthermore, the second stator assembly includes: a second fixing frame, the second fixing frame is an annular structure, the second fixing frame is arranged opposite to the first fixing frame, the second fixing frame is arranged in the outer shell core, and a plurality of second positioning plates are arranged at one end of the second fixing frame facing the first stator assembly, the plurality of second positioning plates are arranged at intervals, and second positioning grooves for installing permanent magnets are formed between adjacent second positioning plates, and the first positioning grooves and the second positioning grooves are arranged one-to-one.

[0017] Furthermore, the second stator assembly also includes: a second E-type stator body, there are multiple second E-type stator bodies, the multiple second E-type stator bodies are arranged in the outer shell core along the circumference of the second fixed frame, the multiple second E-type stator bodies are located at one end of the second fixed frame away from the first stator assembly, and each second E-type stator body is provided with at least one independently controlled second coil winding.

[0018] Furthermore, the winding coils disposed in each mounting slot are independently controlled.

[0019] 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.

[0020] 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.

[0021] The technical solution of the present invention is applied, by setting an axial stator assembly on the outer peripheral side of the thrust plate, setting a first stator assembly and a second stator assembly on both sides of the axial stator assembly, and setting the first stator assembly and the second stator assembly to generate an independently controlled magnetic field. Such a setting 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 axial stator assembly is set on the outer peripheral side of the thrust plate, the axial length of the magnetic bearing assembly can be effectively shortened. The magnetic bearing assembly using 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

[0022] 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:

[0023] Figure 1 A schematic structural diagram of a first embodiment of a magnetic bearing assembly according to the present invention is shown;

[0024] Figure 2 A schematic diagram of an exploded structure of a second embodiment of a magnetic bearing assembly according to the present invention is shown;

[0025] Figure 3 A schematic diagram of a magnetic circuit according to a third embodiment of a magnetic bearing assembly according to the present invention is shown;

[0026] Figure 4 A schematic diagram of a magnetic circuit of a fourth embodiment of a magnetic bearing assembly according to the present invention is shown.

[0027] The above drawings include the following reference numerals:

[0028] 10. Iron core of outer shell;

[0029] 20. Axial stator assembly;

[0030] 21. first axial core; 211. first annular receiving groove; 212. first annular body; 213. first annular tooth portion;

[0031] 22, second axial core; 221, second annular receiving groove; 222, second annular body; 223, second annular tooth portion;

[0032] 23. Axial winding assembly; 231. Support frame; 2311. Mounting slot; 232. Winding coil;

[0033] 30. first stator assembly; 31. first fixing frame; 311. first positioning plate; 32. first E-type stator body;

[0034] 40. second stator assembly; 41. second fixing frame; 411. second positioning plate; 42. second E-type stator body;

[0035] 50. rotating shaft; 51. thrust plate;

[0036] 60. Permanent magnet. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] Combination Figures 1 to 4 As shown, according to a specific embodiment of the present application, a magnetic bearing assembly is provided.

[0042] Specifically, Figure 1 As shown, the magnetic bearing assembly includes a shell core 10, an axial stator assembly 20, a first stator assembly 30, and a second stator assembly 40. The shell core 10 is a magnetic conductive material, and the shell core 10 is provided with a rotating shaft 50. Part of the axial stator assembly 20 is arranged in the shell core 10 along the outer peripheral side of the thrust plate 51 of the rotating shaft 50. The first stator assembly 30 is arranged in the shell core 10 and is located on the first side of the axial stator assembly 20. The second stator assembly 40 is arranged in the shell core 10 and is located on the second side of the axial stator assembly 20, and the second stator assembly 40 is arranged opposite to the first stator assembly 30; wherein, the first stator assembly 30 and the second stator assembly 40 are used to generate independent radial control magnetic fields, and the axial stator assembly 20 is used to generate a control magnetic field along the axial direction of the rotating shaft 50. Wherein, the outer peripheral side of the thrust plate 51 in the present application refers to: as Figure 1 As shown, the thrust disk 51 is a disc structure, and the axial stator assembly 20 is arranged along the outer circumference of the thrust disk 51 , that is, part of the axial stator assembly 20 is located outside the outer circumference of the thrust disk 51 .

[0043] By arranging an axial stator assembly on the outer peripheral side of the thrust plate, arranging a first stator assembly and a second stator assembly on both sides of the axial stator assembly, and arranging the first stator assembly and the second stator assembly 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 of the first stator assembly and the second stator assembly during operation. Since the axial stator assembly is arranged on the outer peripheral side of the thrust plate, 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.

[0044] The axial stator assembly 20 includes a first axial core 21, a second axial core 22 and an axial winding assembly 23. The first axial core 21 is disposed in the shell core 10, and the first axial core 21 has a first annular receiving groove 211. The second axial core 22 is disposed in the shell core 10, and the second axial core 22 has a second annular receiving groove 221. The first axial core 21 and the second axial core 22 are disposed opposite to each other so that the first annular receiving groove 211 and the second annular receiving groove 221 form an annular receiving cavity on the outer peripheral side of the thrust plate 51. The direction of the access current of the axial winding assembly 23 is adjustable. Such a setting can change the direction of the force of the magnetic field force generated by the axial stator assembly 20 on the rotating shaft by changing the direction of the access current.

[0045] The axial winding assembly 23 includes a support frame 231. The outer peripheral surface of the support frame 231 is provided with a plurality of mounting grooves 2311. A winding coil 232 is provided in each mounting groove 2311. Figure 1 and Figure 2 As shown, there are three mounting grooves 2311 , and a coil is disposed in each of the three mounting grooves 2311 .

[0046] Further, the first axial core 21 includes a first annular body 212. A first annular tooth portion 213 is provided on the inner circumference of the first annular body 212 near the thrust plate 51. The outer circle of the first annular tooth portion 213 is arranged at a distance from the inner circle of the first annular body 212 to form a first annular receiving groove 211. The end of the first annular tooth portion 213 is extended toward the side of the second stator assembly 40, and the end of the first annular tooth portion 213 is arranged opposite to the surface of the thrust plate 51 facing the first stator assembly 30. The second axial core 22 includes a second annular body 222. A second annular tooth portion 223 is provided on the inner circumference of the second annular body 222 near the thrust plate 51. The outer circle of the second annular tooth portion 223 is arranged at a distance from the inner circle of the second annular body 222 to form a second annular receiving groove 221. The end of the second annular tooth portion 223 is extended toward the first stator assembly 30, and the end of the second annular tooth portion 223 is arranged opposite to the surface of the thrust plate 51 facing the second stator assembly 40. The end of the second annular body 222 is arranged in contact with the end of the first annular body 212, so that a space for accommodating the thrust plate 51 is formed between the first annular body 212 and the second annular body 222. Such an arrangement can improve the installation stability of the axial winding assembly 23, and can effectively reduce the axial length of the magnetic bearing.

[0047] like Figure 2As shown, the magnetic bearing assembly further includes a permanent magnet 60. The permanent magnet 60 is disposed in the shell core 10, and the permanent magnet 60 is a fan-shaped structure. The permanent magnet 60 is disposed along the circumference of the shell core 10, and there are multiple permanent magnets 60, and the multiple permanent magnets 60 are disposed at intervals between the axial stator assembly 20 and the shell core 10. The permanent magnet 60 is used to generate a bias magnetic field.

[0048] Among them, the first stator assembly 30 includes a first fixed frame 31 and a first E-type stator body 32. The first fixed frame 31 is an annular structure, and the first fixed frame 31 is arranged in the shell core 10. A plurality of first positioning plates 311 are arranged at one end of the first fixed frame 31 facing the second stator assembly 40. The plurality of first positioning plates 311 are arranged at intervals, and a first positioning groove 312 for installing the permanent magnet 60 is formed between adjacent first positioning plates 311. There are a plurality of first E-type stator bodies 32, and the plurality of first E-type stator bodies 32 are arranged in the shell core 10 along the circumference of the first fixed frame 31. The plurality of first E-type stator bodies 32 are located at one end of the first fixed frame 31 away from the second stator assembly 40, and each first E-type stator body 32 is provided with at least one independently controlled first winding coil. Figure 4 As shown, the middle coil of the first E-type stator body 32 is the main coil, and the coils located on both sides thereof are auxiliary coils. When the main coil fails, the auxiliary coils can be used to achieve the same function.

[0049] The second stator assembly 40 includes a second fixing frame 41 and a second E-type stator body 42. The second fixing frame 41 is an annular structure, and the second fixing frame 41 is arranged opposite to the first fixing frame 31. The second fixing frame 41 is arranged in the shell core 10. A plurality of second positioning plates 411 are arranged at one end of the second fixing frame 41 facing the first stator assembly 30, and the plurality of second positioning plates 411 are arranged at intervals, and a second positioning groove 412 for installing the permanent magnet 60 is formed between adjacent second positioning plates 411, and the first positioning groove 312 is arranged one-to-one with the second positioning groove 412. There are a plurality of second E-type stator bodies 42, and the plurality of second E-type stator bodies 42 are arranged in the shell core 10 along the circumferential direction of the second fixing frame 41, and the plurality of second E-type stator bodies 42 are located at one end of the second fixing frame 41 away from the first stator assembly 30, and each second E-type stator body 42 is provided with at least one independently controlled second coil winding. The middle coil of the second E-shaped stator body 42 is a main coil, and the coils on both sides thereof are auxiliary coils. When the main coil fails, the auxiliary coils can be used to achieve the same function.

[0050] The use of the magnetic levitation bearing assembly of the present application can solve the problems of independent axial arrangement of two radial bearings and axial bearings in a five-degree-of-freedom suspension system, which leads to an increase in the axial space of the system, an elongation of the axial length of the rotor, an increase in flexibility, and abnormal mutual coupling between the radial horizontal and vertical control magnetic fields of the radial permanent magnet bias bearing. It can simplify the control logic of the magnetic levitation system and improve the stability and reliability of the magnetic levitation bearing control system.

[0051] like Figure 1 and Figure 3 As shown, the permanent magnet generates a bias magnetic field through the shell core, the radial stator core (the first stator assembly, the second stator assembly), the rotating shaft 50, the thrust plate 51, and the axial stator assembly 20 to form a closed loop, forming a radial axial bias magnetic field C1. The radial axial bias magnetic field C1 forms a bias magnetic flux in the air gap formed by the left and right first E-type stator bodies 32 and the rotating shaft 50, and the radial control main winding C2 provides control of the main and auxiliary magnetic poles and the rotating shaft 50 to form a radial control magnetic field C3, and adjusts the bias magnetic flux at the radial air gap to achieve radial four-degree-of-freedom control of the suspension system. The radial axial bias magnetic field C1 forms a bias magnetic flux in the air gap formed by the axial stator assembly 20 and the thrust plate 51, and the winding coil 232 forms an axial control magnetic field C2 through the axial stator assembly 20 and the thrust plate 51, and adjusts the bias magnetic flux at the axial air gap to achieve axial single-degree-of-freedom control of the suspension system, thereby achieving full-axis five-degree-of-freedom suspension control. The double radial bearings and axial bearings are integrated into one structure, the axial space occupied by the system is reduced, the axial extension of the rotor is shortened, and the flexibility is reduced. The radial control system uses an E-type magnetic pole structure, and a magnetic isolation baffle is set between each E-type stator body 32. The radial horizontal and vertical control magnetic fields are independent of each other and are not coupled to each other. The radial control system and the axial control system are independent of each other and are controlled in a single manner, which simplifies the control logic of the magnetic suspension system and improves the stability of the control system. Both the radial control system and the axial control system are multi-winding controlled, which improves the reliability of the magnetic suspension system.

[0052] The working principle of the radial suspension system is as in the prior art Figure 1As shown, the radial axial bias magnetic field C1 forms a bias magnetic flux at the air gap between the first E-type stator body 32 and the shaft 50. When the shaft is located at the center position, the bias magnetic flux in the upper and lower air gaps are the same, and the shaft is in a balanced state. When the shaft is subjected to a downward impact, the shaft deviates downward, the upper air gap increases, the bias magnetic flux decreases, the lower air gap decreases, the bias magnetic flux increases, the magnetic force of the stator magnetic pole on the shaft is proportional to the square of the magnetic flux, the downward magnetic force is greater than the upward magnetic force, the shaft continues to deviate downward, and cannot be restored to the equilibrium position. The radial control main winding 70 is passed through a control current to form a radial control magnetic field C3, increase the upper air gap control magnetic flux, reduce the lower end control magnetic flux, and achieve that the upper air gap magnetic flux is greater than the lower air gap magnetic flux, the shaft deviates upward, and returns to the equilibrium position. Similarly, when the shaft is horizontally offset, the control method is the same, the radial horizontal and vertical control magnetic fields are independent of each other, and are not coupled to each other, simplifying the control logic. If the radial control main winding 70 fails, the radial control secondary winding 80 can form the same radial control magnetic field C3. Figure 4 If the radial control main winding 70 and the radial control main winding 80 fail, the control winding on the opposite side increases the control current and the corresponding control magnetic field, and can perform the corresponding control function, realize radial freedom multi-winding regulation, and improve system reliability.

[0053] The working principle of the axial suspension system is as follows Figure 3 As shown, the radial axial bias magnetic field C1 forms a bias magnetic flux at the left and right gaps between the axial stator assembly 20 and the thrust plate 51. When the bias magnetic fluxes of the left and right gaps are the same, the shaft is in the axial equilibrium position. When the shaft is subjected to a rightward impact load, the shaft deviates to the right, the right air gap decreases, the magnetic flux increases, the left air gap increases, the magnetic flux decreases, and the shaft continues to deviate to the right and cannot restore balance. The winding coil 232 is fed with a control current to generate an axial control magnetic field C2. The control magnetic field in the left air gap is in the same direction as the bias magnetic field and superimposed on each other. The bias magnetic field in the right air gap is in the opposite direction to the control magnetic field and cancels each other, so that the left end magnetic flux is greater than the right end magnetic flux, and the shaft deviates to the left until it returns to the equilibrium position. The winding coil 232 is multi-winding controlled, and each winding is independent of each other. When a single winding is abnormal, the remaining control windings increase the control current to generate the same axial control magnetic field C2, thereby improving the reliability of the axial suspension system.

[0054] like Figure 2As shown, the implementation process of the magnetic bearing assembly provided in the present application includes: the second E-type stator body core is loaded into the second fixed frame from the left side by a shrink sleeve method to achieve radial fixation, the contact surface is closely fitted, and the axial fixation is achieved by screw locking. The outer shell core is heated, and the second fixed frame is aligned with the boss of the outer shell core 10 from the right side for radial positioning, and the contact surface is closely fitted to achieve axial positioning. Among them, the permanent magnet 60 is fan-shaped, and four fan-shaped permanent magnets are inserted into the second positioning groove of the second fixed frame for radial positioning. The inner and outer surfaces of the permanent magnet are closely fitted with the outer surface of the axial stator core and the inner surface of the outer shell core 10, respectively. The rotating shaft enters the shaft from the left side of the outer shell core 10, and fits with the magnetic pole surface inside the first E-type stator body core for axial positioning. The axial winding assembly is loaded into the first annular receiving groove of the first axial core from the right side to form a front axial stator assembly, and the axial multi-control windings existing inside are independent of each other and the control current is passed separately. The first stator assembly is installed into the first fixing frame from the right side through the shrink fitting process, and the first fixing frame is installed into the outer shell core 10 from the right side. The first annular receiving groove of the first fixing frame corresponds to the permanent magnet to achieve circumferential fixation. The outer magnetic poles of the first axial core and the second axial core fit closely to achieve axial positioning. The outer surface of the first fixing frame fits closely with the inner surface of the outer shell core 10 to achieve radial positioning. The first stator assembly 30 and the second stator assembly 40 are respectively installed in the fan-shaped slots formed by the first fixing frame and the second fixing frame to achieve radial and axial positioning. The radial control main winding and the radial control auxiliary winding inside the first fixing frame and the second fixing frame are independent of each other, and the control current is independently passed. The two radial control auxiliary windings are connected in series. When the main winding is abnormal, the auxiliary winding can generate the same radial control magnetic field, thereby realizing the regulation of radial freedom. The above-mentioned implementation process completes the installation and implementation of the entire five-degree-of-freedom magnetic suspension system.

[0055] The magnetic suspension bearing structure of the present application can realize the integration of dual radial-axial bearings, and the dual radial control system and the axial control system are independent of each other and do not interfere with each other. The suspension system shares a bias magnetic circuit, which effectively shortens the axial space occupied, reduces the number of parts, and saves material costs. The E-type magnetic pole structure is used to separate the radial horizontal and vertical freedom control systems, and the control magnetic fields are not coupled and independent of each other, simplifying the control logic of the radial freedom and improving the stability of the magnetic suspension system. The main and auxiliary magnetic poles of the E-type magnetic pole are wound around the main and auxiliary control windings, so that the radial freedom multi-winding control is achieved, and 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 to the corresponding control current, which can generate a control magnetic field with the same function as the main control winding. When the main winding and the auxiliary winding on one side are abnormal at the same time, the input current in the control winding on the opposite side can be adjusted to exercise the corresponding control function, thereby improving the reliability of the radial suspension system.

[0056] The radial control system and the axial control system are independent of each other and do not interfere with each other. The suspension system shares a bias magnetic field. This makes the axial space of the magnetic suspension system small, the shaft length short, the flexibility low, and the axial-radial system share a permanent magnet, which reduces the number of parts and saves material costs. In this application, an E-type radial stator core is used to separate the radial horizontal and vertical freedom control systems, making the radial horizontal and vertical freedom control magnetic circuits independent of each other, simplifying the radial freedom control logic, and improving the stability and reliability of the radial control of the magnetic suspension bearing.

[0057] The main and auxiliary control windings are wound on the main and auxiliary poles of the E-type magnetic pole to achieve multi-winding control of the radial degree of freedom, thereby avoiding the magnetic levitation system being in an uncontrolled state when a single winding control failure occurs, thereby significantly improving the stability and reliability of the radial magnetic levitation system.

[0058] At the same time, the winding coil 232 is a plurality of independently controlled winding coils, and the single controlled windings are independent of each other and arranged in parallel. Such an arrangement enables multi-winding control of the axial degree of freedom, thereby avoiding the magnetic suspension system being in an uncontrolled state when a single winding control failure occurs, thereby improving the stability and reliability of the axial suspension system.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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: A shell iron core (10), wherein the shell iron core (10) is provided with a rotating shaft (50); An axial stator assembly (20), wherein a portion of the axial stator assembly (20) is arranged inside the shell core (10) along the outer peripheral side of the thrust plate (51) of the rotating shaft (50); A first stator assembly (30), the first stator assembly (30) being arranged on the shell core (10) and located on a first side of the axial stator assembly (20); a second stator assembly (40), the second stator assembly (40) being arranged in the shell core (10) and located on a second side of the axial stator assembly (20), the second stator assembly (40) being arranged opposite to the first stator assembly (30); The first stator assembly (30) and the second stator assembly (40) are used to generate independent radial control magnetic fields, and the axial stator assembly (20) is used to generate a control magnetic field along the axial direction of the rotating shaft (50); the axial stator assembly (20) comprises: A first axial iron core (21), the first axial iron core (21) being arranged in the shell iron core (10), the first axial iron core (21) having a first annular accommodating groove (211); a second axial core (22), the second axial core (22) being arranged in the shell core (10), the second axial core (22) having a second annular receiving groove (221), the first axial core (21) and the second axial core (22) being arranged opposite to each other so that the first annular receiving groove (211) and the second annular receiving groove (221) form an annular receiving cavity on the outer peripheral side of the thrust plate (51); An axial winding assembly (23), the direction of the input current of the axial winding assembly (23) is adjustable.

2. The magnetic bearing assembly according to claim 1, characterized in that: The axial winding assembly (23) comprises: A support frame (231), wherein the outer peripheral surface of the support frame (231) is provided with a plurality of mounting grooves (2311); A winding coil (232), wherein each of the mounting grooves (2311) is provided with a winding coil (232).

3. The magnetic bearing assembly according to claim 1, characterized in that: The first axial core (21) comprises: A first annular body (212), wherein a first annular tooth portion (213) is arranged on the inner circumferential surface of the first annular body (212) on a side close to the thrust plate (51), an outer circle of the first annular tooth portion (213) is arranged at a distance from an inner circle of the first annular body (212) to form the first annular accommodating groove (211), an end portion of the first annular tooth portion (213) is extended toward a side of the second stator assembly (40), and an end portion of the first annular tooth portion (213) is arranged opposite to a surface of the thrust plate (51) on a side facing the first stator assembly (30).

4. The magnetic bearing assembly according to claim 3, characterized in that: The second axial core (22) comprises: A second annular body (222), wherein a second annular tooth portion (223) is arranged on the inner circumferential surface of the second annular body (222) close to the thrust plate (51), an outer circle of the second annular tooth portion (223) and an inner circle of the second annular body (222) are arranged at a distance to form a second annular receiving groove (221), an end portion of the second annular tooth portion (223) is extended toward one side of the first stator assembly (30), and an end portion of the second annular tooth portion (223) is arranged opposite to a surface of the thrust plate (51) on the side facing the second stator assembly (40); The end of the second annular body (222) is arranged to abut against the end of the first annular body (212), so that a space for accommodating the thrust plate (51) is formed between the first annular body (212) and the second annular body (222).

5. The magnetic bearing assembly according to claim 1, characterized in that: The magnetic bearing assembly also includes: A permanent magnet (60), wherein the permanent magnet (60) is arranged in the shell core (10), the permanent magnet (60) is a fan-shaped structure, the permanent magnet (60) is arranged along the circumference of the shell core (10), and there are multiple permanent magnets (60), and the multiple permanent magnets (60) are arranged at intervals between the axial stator assembly (20) and the shell core (10).

6. The magnetic bearing assembly according to claim 1, characterized in that: The first stator assembly (30) comprises: A first fixing frame (31), the first fixing frame (31) is an annular structure, the first fixing frame (31) is arranged in the shell core (10), and a plurality of first positioning plates (311) are arranged at one end of the first fixing frame (31) facing the second stator assembly (40), the plurality of first positioning plates (311) are arranged at intervals, and first positioning grooves (312) for mounting permanent magnets (60) are formed between adjacent first positioning plates (311).

7. The magnetic bearing assembly according to claim 6, characterized in that: The first stator assembly (30) further comprises: A first E-type stator body (32), wherein the first E-type stator body (32) is multiple, and the multiple first E-type stator bodies (32) are arranged in the shell core (10) along the circumference of the first fixing frame (31), and the multiple first E-type stator bodies (32) are located at one end of the first fixing frame (31) away from the second stator assembly (40), and each of the first E-type stator bodies (32) is provided with at least one independently controlled first winding coil.

8. The magnetic bearing assembly according to claim 6, characterized in that: The second stator assembly (40) comprises: A second fixing frame (41), the second fixing frame (41) is an annular structure, the second fixing frame (41) is arranged opposite to the first fixing frame (31), the second fixing frame (41) is arranged in the shell core (10), a plurality of second positioning plates (411) are arranged at one end of the second fixing frame (41) facing the first stator assembly (30), the plurality of second positioning plates (411) are arranged at intervals, and second positioning grooves (412) for mounting permanent magnets (60) are formed between adjacent second positioning plates (411), and the first positioning grooves (312) and the second positioning grooves (412) are arranged in a one-to-one correspondence.

9. The magnetic bearing assembly according to claim 8, characterized in that: The second stator assembly (40) further comprises: A second E-type stator body (42), wherein the second E-type stator body (42) is multiple, and the multiple second E-type stator bodies (42) are arranged in the shell core (10) along the circumference of the second fixed frame (41), and the multiple second E-type stator bodies (42) are located at one end of the second fixed frame (41) away from the first stator assembly (30), and each second E-type stator body (42) is provided with at least one independently controlled second coil winding.

10. The magnetic bearing assembly according to claim 2, characterized in that: The winding coils (232) disposed in each of the mounting grooves (2311) are independently controlled.

11. 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 10.

12. 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 10.

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