Three-degree-of-freedom Lorentz force magnetic bearing

Abstract

The utility model belongs to the field of magnetic bearings, and particularly relates to a three-degree-of-freedom Lorentz force magnetic bearing which comprises a magnetic bearing rotor and a magnetic bearing stator, the magnetic bearing stator comprises a cylindrical coil framework and three coils arranged on the coil framework in an annular array mode, and each coil is independently connected with a wire to control current. The magnetic bearing rotor comprises a rotor structural part and a rotor assembly, an annular groove is formed in the annular outer end face of the rotor structural part in an inward concave mode, and the annular groove and the rotor structural part are concentric; the rotor assembly comprises an outer wall part and an inner wall part, the magnetic bearing stator is arranged between the outer wall part and the inner wall part, and working air gaps are formed between the outer side of the magnetic bearing stator and the outer wall part and between the inner side of the magnetic bearing stator and the inner wall part. According to the three-degree-of-freedom lorentz force magnetic bearing provided by the utility model, the magnetic bearing stator adopts a single-layer coil structure to realize three-degree-of-freedom suspension control of axial translation and radial rotation, so that the volume and the mass of the lorentz force magnetic bearing are effectively reduced, and the product manufacturing cost is effectively reduced.

Description

Technical Field

[0001] This utility model belongs to the field of magnetic bearings, specifically relating to a three-degree-of-freedom Lorentz force magnetic bearing. Background Technology

[0002] Magnetic bearings offer advantages such as no mechanical contact, no friction or wear, no lubrication required, long lifespan, and active vibration control, leading to their widespread application in aerospace, transportation, industrial manufacturing, precision instruments, and medical fields. Based on the principle of magnetic force generation, magnetic bearings are broadly classified into two categories: reluctance magnetic bearings and Lorentz force magnetic bearings. The magnetic force of Lorentz force magnetic bearings is proportional to the control current, facilitating precise magnetic force control and making them suitable for applications requiring high vibration control, such as magnetic levitation inertial actuators and magnetic levitation vibration isolation platforms.

[0003] Existing Lorentz force magnetic bearings all suffer from technical problems such as complex structure and high manufacturing cost. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a three-degree-of-freedom Lorentz force magnetic bearing with a simple structure and low manufacturing cost.

[0005] This utility model provides a three-degree-of-freedom Lorentz force magnetic bearing, including a magnetic bearing mover and a magnetic bearing stator;

[0006] The magnetic bearing stator includes a cylindrical coil frame and at least three coils arranged in a ring array on the coil frame, each coil being independently wired to control the current;

[0007] The magnetic bearing mover includes a mover structure and a mover assembly. The mover structure is annular, and an annular groove is provided on the outer end of the annular surface of the mover structure. The annular groove is concentric with the mover structure.

[0008] The moving part assembly includes an outer wall portion disposed on the outer wall of the annular groove ring and an inner wall portion disposed on the inner wall of the annular groove ring. The magnetic bearing stator is disposed between the outer wall portion and the inner wall portion, and both the outer side of the magnetic bearing stator and the outer wall portion and the inner side of the magnetic bearing stator and the inner wall portion have working air gaps.

[0009] Furthermore, the coil frame is provided with multiple grooves evenly distributed circumferentially according to the number of coils;

[0010] Each of the grooves is fitted with a coil.

[0011] Furthermore, a positioning boss is provided in the middle of the groove;

[0012] The coil is sleeved on the positioning boss, and there is a gap between the coil and the inner wall of the groove.

[0013] Furthermore, the number of coils is less than or equal to six.

[0014] Furthermore, the outer wall portion includes an outer magnetic ring, an upper outer permanent magnet ring, and a lower outer permanent magnet ring, and the inner wall portion includes an inner magnetic ring;

[0015] The outer magnetic ring is disposed on the outer wall of the annular groove, the inner magnetic ring is disposed on the inner wall of the annular groove, and the upper outer permanent magnet ring and the lower outer permanent magnet ring are respectively disposed on the upper and lower sides of the inner wall of the outer magnetic ring;

[0016] The outer side of the magnetic bearing stator has a working air gap with the outer upper permanent magnet ring and the outer lower permanent magnet ring, and the inner side has a working air gap with the inner magnetic guide ring.

[0017] Furthermore, an outer middle permanent magnet ring is provided between the outer upper permanent magnet ring and the outer lower permanent magnet ring, and the outer upper permanent magnet ring, the outer middle permanent magnet ring and the outer lower permanent magnet ring constitute an orthogonal Halbach permanent magnet array.

[0018] Furthermore, the inner wall portion also includes an upper inner permanent magnet ring and a lower inner permanent magnet ring;

[0019] The inner upper permanent magnet ring and the inner lower permanent magnet ring are respectively disposed on the upper and lower sides of the outer wall of the inner magnetic guide ring;

[0020] The stator of the magnetic bearing has a working air gap between its outer side and the outer upper permanent magnet ring and the outer lower permanent magnet ring, and a working air gap between its inner side and the inner upper permanent magnet ring and the inner lower permanent magnet ring.

[0021] Furthermore, an outer middle permanent magnet ring is provided between the outer upper permanent magnet ring and the outer lower permanent magnet ring, and the outer upper permanent magnet ring, the outer middle permanent magnet ring and the outer lower permanent magnet ring constitute an orthogonal Halbach permanent magnet array;

[0022] An inner middle permanent magnet ring is disposed between the inner upper permanent magnet ring and the inner lower permanent magnet ring. The inner upper permanent magnet ring, the inner middle permanent magnet ring, and the inner lower permanent magnet ring constitute an orthogonal Halbach permanent magnet array.

[0023] Furthermore, the outer wall portion includes an upper outer magnetic ring, a lower outer magnetic ring, and an outer permanent magnet ring, and the inner wall portion includes an inner magnetic ring;

[0024] The outer upper magnetic ring, the outer permanent magnet ring, and the outer lower magnetic ring are sequentially arranged on the outer wall of the annular groove, and the inner magnetic ring is arranged on the inner wall of the annular groove;

[0025] The outer side of the magnetic bearing stator has a working air gap with the outer upper magnetic ring, the outer permanent magnet ring, and the outer lower magnetic ring, and the inner side has a working air gap with the inner magnetic ring.

[0026] Furthermore, the outer wall portion includes an outer upper magnetic conducting ring, an outer lower magnetic conducting ring, and an outer permanent magnet ring, and the inner wall portion includes an inner upper magnetic conducting ring, an inner lower magnetic conducting ring, and an inner permanent magnet ring;

[0027] The outer upper magnetic ring, the outer permanent magnet ring, and the outer lower magnetic ring are sequentially arranged on the outer wall of the annular groove, and the inner upper magnetic ring, the inner permanent magnet ring, and the inner lower magnetic ring are sequentially arranged on the inner wall of the annular groove.

[0028] The outer side of the magnetic bearing stator has a working air gap with the outer upper magnetic guide ring, the outer permanent magnet ring, and the outer lower magnetic guide ring, and the inner side has a working air gap with the inner upper magnetic guide ring, the inner permanent magnet ring, and the inner lower magnetic guide ring.

[0029] The beneficial effects of this invention are that the three-degree-of-freedom Lorentz magnetic bearing provided by this invention uses a single-layer coil structure for its stator to achieve three degrees of freedom of axial translation and radial rotation, effectively reducing the volume and weight of the Lorentz magnetic bearing, thereby significantly reducing product manufacturing costs. Furthermore, when more than three coils are configured, redundant control of the three degrees of freedom of the magnetic bearing can be achieved, improving the product's operational reliability. The magnetic bearing mover also has a simple structure, which can improve product production efficiency and reduce product manufacturing costs. Attached Figure Description

[0030] Appendix Figure 1 This is a schematic diagram of the orthographic structure of the three-degree-of-freedom Lorentz force magnetic bearing with a single-sided radial permanent magnet in this utility model.

[0031] Appendix Figure 2 For the appendix Figure 1 A schematic diagram of the working principle of the coil in a Lorentz magnetic bearing;

[0032] Appendix Figure 3 This is a schematic diagram of the orthographic structure of the three-degree-of-freedom Lorentz force magnetic bearing with double-sided radial permanent magnets in this utility model.

[0033] Appendix Figure 4 For the appendix Figure 3 A schematic diagram of the working principle of the coil in a Lorentz magnetic bearing;

[0034] Appendix Figure 5 This is a schematic diagram of the cross-sectional structure of the three-degree-of-freedom Lorentz force magnetic bearing of the single-sided Halbach permanent magnet array in this utility model.

[0035] Appendix Figure 6 For the appendix Figure 5 A schematic diagram of the working principle of the coil in a Lorentz magnetic bearing;

[0036] Appendix Figure 7 This is a schematic diagram of the orthographic structure of the three-degree-of-freedom Lorentz force magnetic bearing with a double-sided Halbach permanent magnet array in this utility model.

[0037] Appendix Figure 8 For the appendix Figure 7 A schematic diagram of the working principle of the coil in a Lorentz magnetic bearing;

[0038] Appendix Figure 9 This is a schematic diagram of the orthographic structure of the three-degree-of-freedom Lorentz force magnetic bearing with a central axial single permanent magnet of this utility model.

[0039] Appendix Figure 10 For the appendix Figure 9 A schematic diagram of the working principle of the coil in a Lorentz magnetic bearing;

[0040] Appendix Figure 11 This is a schematic diagram of the orthographic structure of the three-degree-of-freedom Lorentz force magnetic bearing with central axial dual permanent magnets of this utility model;

[0041] Appendix Figure 12 For the appendix Figure 11 A schematic diagram of the working principle of the coil in a Lorentz magnetic bearing;

[0042] Appendix Figure 13 This is an exploded view of the magnetic bearing stator of a preferred embodiment of the present invention;

[0043] Appendix Figure 14 This is one of the schematic diagrams illustrating the three-degree-of-freedom decoupling control principle of a magnetic bearing in an embodiment of this utility model with three coils;

[0044] Appendix Figure 15 This is the second schematic diagram of the three-degree-of-freedom decoupling control principle of the magnetic bearing in an embodiment of this utility model with three coils;

[0045] Appendix Figure 16 This is the third schematic diagram of the three-degree-of-freedom decoupling control principle of the magnetic bearing in an embodiment of this utility model with three coils.

[0046] In the diagram, 1-magnetic bearing mover; 11-motor structural component; 111-annular groove; 12-motor assembly; 121-outer magnetic ring; 122-inner magnetic ring; 123-outer upper permanent magnet ring; 124-outer lower permanent magnet ring; 125-inner upper permanent magnet ring; 126-inner lower permanent magnet ring; 127-outer upper magnetic ring; 128-outer lower magnetic ring; 129-outer permanent magnet ring; 1210-inner upper magnetic ring; 1211-inner lower magnetic ring; 1212-inner permanent magnet ring; 1213-outer middle permanent magnet ring; 1214-inner middle permanent magnet ring; 2-magnetic bearing stator; 21-coil frame; 211-groove; 2111-upper edge; 2112-lower edge; 2113-bar; 212-positioning boss; 22-coil; 3-working air gap. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0048] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0049] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal connection of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0052] As attached Figure 1 -Appendix Figure 16 As shown, this utility model provides a three-degree-of-freedom Lorentz force magnetic bearing, including a magnetic bearing mover 1 and a magnetic bearing stator 2;

[0053] The magnetic bearing stator 2 includes a cylindrical coil frame 21 and at least three coils 22 arranged in a ring array on the coil frame 21. Each coil 22 is independently wired to control the current, thereby generating three independently controlled axial forces. This achieves decoupled control of the three degrees of freedom of axial translation and radial rotation. When there are more than three coils 22, the independent control forces provided by the coils 22 exceed three (the number of control forces is consistent with the number of coils 22), which is more than the number of control degrees of freedom of the magnetic bearing. Therefore, redundant control of the three degrees of freedom of this three-free Lorentz force magnetic bearing can be achieved, that is, one or more of the coils 22 are allowed to fail (but at least three coils 22 must be kept working normally), and this three-free Lorentz force magnetic bearing can still work normally.

[0054] The magnetic bearing mover 1 includes a mover structure 11 and a mover assembly 12. The mover structure 11 is annular, and an annular groove 111 is provided on the outer end face of the annular structure 11. In actual production, the annular groove 111 can be machined on the end face of the annular structure 11, or it can be formed by stacking circular plates of different sizes. The annular groove 111 is concentric with the mover structure 11.

[0055] The mover assembly 12 includes an outer wall portion disposed on the outer wall of the annular groove 111 and an inner wall portion disposed on the inner wall of the annular groove 111. The magnetic bearing stator 2 is disposed between the outer wall portion and the inner wall portion, and both the outer side of the magnetic bearing stator 2 and the outer wall portion and the inner side of the magnetic bearing stator 2 and the inner wall portion have working air gaps 3, thereby efficiently utilizing magnetic field energy to achieve stable non-contact suspension of the magnetic bearing mover 1 on the magnetic bearing stator 2.

[0056] The three-degree-of-freedom Lorentz magnetic bearing provided by this invention employs a single-layer coil structure in its magnetic bearing stator 2 to achieve three degrees of freedom suspension control: axial translation and radial rotation. This effectively reduces the size and weight of the Lorentz magnetic bearing, thereby significantly lowering manufacturing costs. Furthermore, when more than three coils are configured, redundant control of the three degrees of freedom can be achieved, improving product reliability. The magnetic bearing mover 1 also features a simple structure, improving production efficiency and reducing manufacturing costs.

[0057] In one embodiment, reference is made to the appendix. Figure 13 The coil frame 21 is provided with a plurality of grooves 211 evenly distributed around the circumference according to the number of coils 22;

[0058] Each groove 211 is fitted with a coil 22. By setting the groove 211, the installation difficulty of the coil 22 can be simplified, and the stability of the installation of the coil 22 can be improved.

[0059] In one embodiment, a positioning boss 212 is provided in the middle of the groove 211;

[0060] The coil 22 is sleeved on the positioning boss 212, and there is a gap between the coil 22 and the inner wall of the groove 211. By setting the positioning boss 212, the installation stability and accuracy of the coil 22 can be further improved.

[0061] In one specific embodiment, the coil frame 21 is made of a non-conductive and non-magnetic non-metallic material with good processing performance, such as polyimide processing or glass fiber manufacturing; grooves 211 for mounting the coil are evenly distributed on the outer circular surface of the coil frame 21, and a positioning boss 212 is left in the middle of the groove 211. An upper stop edge 2111 is provided at the upper end of the groove 211, and a lower stop edge 2112 is provided at the lower end of the groove 211. The grooves 211 are separated by a stop bar 2113. The stop bar 2113 and the upper stop edge 2112 are connected to the lower stop edge 2112. The upper and lower stops 2111 and the lower stop 2112 are connected to ensure the structural strength of the coil frame 21. The axial length of the upper stop 2111 is 1~3mm, and the circumferential length of the stop bar 2113 is 2~8mm. The length and width of the positioning boss 212 are consistent with the length and width of the inner hole of the coil 22 to ensure the positioning accuracy of the coil 22 when it is embedded. After the coil 22 is embedded in the groove 211, a gap of 0.1~0.2mm is left between it and the upper stop 2111, the lower stop 2112 and the stop bar 2113.

[0062] In one specific embodiment, the coil 22 is formed by winding insulated enameled wire with a wire diameter of 0.2~1.0mm. During assembly, the surface of the coil 22 is coated with epoxy resin and embedded in the groove 211. The inner arc surface of the coil 22 is tightly and firmly connected to the outer circular surface of the groove 211. The outer arc surface of the coil 22 does not exceed the height of the positioning boss 212. The epoxy resin on the outer arc surface of the coil 22 and inside the groove 211 that protrudes above the outer circular surface of the coil frame 21 is removed by precision machining.

[0063] In one embodiment, one end of the coil frame 21 protrudes from the opening of the annular groove 111. This end of the coil frame 21 is used to connect one of the connecting rotating parts of the magnetic bearing, such as a shaft, while the moving part 11 is used to connect the other connecting rotating part of the magnetic bearing, such as a hole. This arrangement simplifies the connection of the magnetic bearing between two connecting rotating parts that need to rotate relative to each other.

[0064] In one embodiment, the number of coils 22 is less than or equal to six. According to the requirements of controlling redundancy, the number of coils 22 is less than or equal to six, which can ensure the simplicity of the structure.

[0065] In one embodiment, the moving part 11 is made of a non-magnetic metal material with good machinability, such as hard aluminum alloy 2A12 or non-magnetic stainless steel. The inner and outer walls of the moving part 11 are strictly coaxial, and the inner and outer mounting end faces of the moving part 11 are coplanar and orthogonal to the inner and outer walls.

[0066] The moving part assembly 12 in this utility model has six structural arrangements. According to the structural arrangement of the moving part assembly 12, the three-degree-of-freedom Lorentz magnetic bearing can be divided into six types: a three-degree-of-freedom Lorentz magnetic bearing with a single-sided radial permanent magnet, a three-degree-of-freedom Lorentz magnetic bearing with a double-sided radial permanent magnet, a three-degree-of-freedom Lorentz magnetic bearing with a single-sided Halbach permanent magnet array, a three-degree-of-freedom Lorentz magnetic bearing with a double-sided Halbach permanent magnet array, a three-degree-of-freedom Lorentz magnetic bearing with a single axial permanent magnet, and a three-degree-of-freedom Lorentz magnetic bearing with two axial permanent magnets. The six magnetic bearing structural forms are described separately below.

[0067] Reference Appendix Figure 1 The specific structure of the mover assembly 12 of the three-degree-of-freedom Lorentz force magnetic bearing with a single-sided radial permanent magnet is as follows:

[0068] The outer wall portion includes an outer magnetic ring 121, an outer upper permanent magnet ring 123, and an outer lower permanent magnet ring 124; the inner wall portion includes an inner magnetic ring 122.

[0069] The outer magnetic ring 121 is disposed on the outer wall of the annular groove 111, the inner magnetic ring 122 is disposed on the inner wall of the annular groove 111, and the upper outer permanent magnet ring 123 and the lower outer permanent magnet ring 124 are respectively disposed on the upper and lower sides of the inner wall of the outer magnetic ring 121.

[0070] The outer side of the magnetic bearing stator 2 has a working air gap 3 with the outer upper permanent magnet ring 123 and the outer lower permanent magnet ring 124, and the inner side has a working air gap 3 with the inner magnetic guide ring 122.

[0071] Specifically, a working air gap 3 is provided between the inner circular surfaces of the outer upper permanent magnet ring 123 and the outer lower permanent magnet ring 124 and the outer circular surface of the inner magnetic ring 122, and the length of the working air gap 3 is 4~8mm.

[0072] The outer upper permanent magnet ring 123 and the outer lower permanent magnet ring 124 have the same dimensions. The upper end face of the outer upper permanent magnet ring 123 does not exceed the upper end face of the outer magnetic ring 121, and the lower end face of the outer lower permanent magnet ring 124 does not exceed the lower end face of the outer magnetic ring 121. There is a gap of 0~3mm between the lower end face of the outer upper permanent magnet ring 123 and the upper end face of the outer lower permanent magnet ring 124. The upper and lower end faces of the outer magnetic ring 121 and the inner magnetic ring 122 are coplanar. The axial length of the outer magnetic ring 121 and the inner magnetic ring 122 is the same. The radial length of the outer magnetic ring 121 is greater than the radial length of the inner magnetic ring 122. The outer magnetic ring 121 and the inner magnetic ring 122 are strictly coaxially installed.

[0073] The outer magnetic ring 121 and the inner magnetic ring 122 are precision machined from metal materials with good magnetic permeability, such as 1J50 and No. 10 steel; the outer upper permanent magnet ring 123 and the outer lower permanent magnet ring 124 are made of sintered rare earth permanent magnet materials such as neodymium iron boron or samarium cobalt materials, and are assembled from separately manufactured magnets into an integral circular ring.

[0074] Reference Appendix Figure 2 The outer upper permanent magnet ring 123 is radially magnetized by NS, and the outer lower permanent magnet ring 124 is radially magnetized by SN. The magnetomotive force of the outer upper permanent magnet ring 123 and the outer lower permanent magnet ring 124 forms a closed magnetic flux loop through the outer magnetic ring 121, the outer lower permanent magnet ring 124, the working air gap 3, the inner magnetic ring 122, the working air gap 3, the outer upper permanent magnet ring 123, and the outer magnetic ring 121.

[0075] Preferably, the upper end face of the outer magnetic ring 121 is in close contact with the outer mounting end face of the moving part 11, and the outer circular surface of the outer magnetic ring 121 is tightly and firmly connected to the outer wall of the annular groove 111 by temperature difference interference fit. The upper end face of the upper permanent magnet ring 123 is flush with the upper end face of the outer magnetic ring 121, and the outer circular surface of the upper permanent magnet ring 123 is tightly and firmly connected to the inner circular surface of the outer magnetic ring 121 by epoxy resin adhesive. The lower end face of the lower permanent magnet ring 124 is flush with the lower end face of the outer magnetic ring 121. A magnetic isolation ring is provided between the upper end face of the lower permanent magnet ring 124 and the lower end face of the upper permanent magnet ring 123. The axial length of the magnetic isolation ring is 2~3mm, and the inner and outer diameters of the magnetic isolation ring are the same as those of the upper and lower permanent magnet rings 123. The inner and outer diameters of 124 are the same. The material of the magnetic isolation ring is a non-magnetic metal such as aluminum alloy. The outer circular surface of the magnetic isolation ring is firmly connected to the inner circular surface of the outer magnetic ring 121 with epoxy resin. The upper end surface of the magnetic isolation ring is firmly connected to the lower end surface of the outer upper permanent magnet ring 123 with epoxy resin. The outer circular surface of the outer lower permanent magnet ring 124 is firmly connected to the inner circular surface of the outer magnetic ring 121 with epoxy resin. The upper end surface of the outer lower permanent magnet ring 124 is firmly connected to the lower end surface of the magnetic isolation ring with epoxy resin. The upper end surface of the inner magnetic ring 122 is tightly attached to the inner mounting end surface of the mover structure 11. The inner circular surface of the inner magnetic ring 122 is firmly connected to the inner wall of the annular groove 111 through temperature difference interference fitting.

[0076] In some embodiments, the upper end face of the outer magnetic ring 121 is firmly connected to the outer mounting end face of the mover structure 11 using epoxy resin adhesive; the outer circular surface of the outer magnetic ring 121 is firmly connected to the outer wall of the annular groove 111 using epoxy resin adhesive; the upper end face of the upper outer permanent magnet ring 123 is flush with the upper end face of the outer magnetic ring 121; there is no gap between the upper end face of the lower outer permanent magnet ring 124 and the upper end face of the upper outer permanent magnet ring 123; and the outer circular surface of the upper outer permanent magnet ring 123 is firmly connected to the inner circular surface of the outer magnetic ring 121 using epoxy resin adhesive. The upper end face of the outer lower permanent magnet ring 124 is firmly connected to the lower end face of the outer upper permanent magnet ring 123 with epoxy resin adhesive. The outer circular surface of the outer lower permanent magnet ring 124 is firmly connected to the inner circular surface of the outer magnetic ring 121 with epoxy resin adhesive. The lower end face of the outer lower permanent magnet ring 124 is flush with the lower end face of the outer magnetic ring 121. The upper end face of the inner magnetic ring 122 is firmly connected to the inner mounting end face of the mover structure 11 with epoxy resin adhesive. The inner circular surface of the inner magnetic ring 122 is firmly connected to the inner wall of the annular groove 111 with epoxy resin adhesive.

[0077] In some embodiments, the inner and outer circular surfaces of the magnetic bearing stator 2 are respectively separated from the outer circular surface of the inner magnetic ring 122 of the mover assembly 12 and the inner circular surfaces of the upper and lower permanent magnet rings 123 and 124 by equal length gaps, with a gap length of 0.3~0.8mm; the upper and lower axial positions of the coil 22 of the magnetic bearing stator 2 are respectively located between the axial positions of the upper and lower permanent magnet rings 123 and 124 of the mover assembly 12, and do not exceed the axial positions of the upper and lower permanent magnet rings 123 and 124; and a gap of 2~5mm is left between the top of the magnetic bearing stator 2 and the bottom of the annular groove 111 of the mover structure 11.

[0078] Reference Appendix Figure 3 The specific structure of the mover assembly 12 of the three-degree-of-freedom Lorentz force magnetic bearing with double-sided radial permanent magnets is as follows:

[0079] The outer wall of the mover assembly 12 of the three-degree-of-freedom Lorentz magnetic bearing with double-sided radial permanent magnets is the same as that of the mover assembly 12 of the three-degree-of-freedom Lorentz magnetic bearing with single-sided radial permanent magnets. The difference lies in the inner wall. Specifically, the inner wall of the mover assembly 12 of the three-degree-of-freedom Lorentz magnetic bearing with double-sided radial permanent magnets also includes an inner upper permanent magnet ring 125 and an inner lower permanent magnet ring 126.

[0080] The inner upper permanent magnet ring 125 and the inner lower permanent magnet ring 126 are respectively disposed on the upper and lower sides of the outer wall of the inner magnetic ring 122;

[0081] The outer side of the magnetic bearing stator 2 has a working air gap 3 with the outer upper permanent magnet ring 123 and the outer lower permanent magnet ring 124, and the inner side has a working air gap 3 with the inner upper permanent magnet ring 125 and the inner lower permanent magnet ring 126.

[0082] Specifically, a working air gap 3 is provided between the inner circular surface of the outer upper permanent magnet ring 123 and the outer circular surface of the inner upper permanent magnet ring 125, and between the inner circular surface of the outer lower permanent magnet ring 124 and the outer circular surface of the inner lower permanent magnet ring 126. The length of the working air gap 3 is 4~8mm.

[0083] The inner upper permanent magnet ring 125 and the inner lower permanent magnet ring 126 are made of sintered rare earth permanent magnet materials such as neodymium iron boron or samarium cobalt. They are assembled from separately manufactured magnets into a whole ring. The outer upper permanent magnet ring 123 is radially magnetized by NS, the outer lower permanent magnet ring 124 is radially magnetized by SN, the inner upper permanent magnet ring 125 is radially magnetized by NS, and the inner lower permanent magnet ring 126 is radially magnetized by SN.

[0084] Reference Appendix Figure 4The magnetomotive force of the outer upper permanent magnet ring 123, outer lower permanent magnet ring 124, inner upper permanent magnet ring 125, and inner lower permanent magnet ring 126 forms a closed magnetic flux loop through the outer magnetic guide ring 121, outer lower permanent magnet ring 124, working air gap 3, inner lower permanent magnet ring 126, inner magnetic guide ring 122, inner upper permanent magnet ring 125, working air gap 3, outer upper permanent magnet ring 123, and outer magnetic guide ring 121.

[0085] The outer upper permanent magnet ring 123 and the outer lower permanent magnet ring 124 of the mover assembly 12 have the same radial length, the inner upper permanent magnet ring 125 and the inner lower permanent magnet ring 126 have the same radial length, the outer upper permanent magnet ring 123, the outer lower permanent magnet ring 124, the inner upper permanent magnet ring 125 and the inner lower permanent magnet ring 126 have the same axial length, the outer upper permanent magnet ring 123 and the inner upper permanent magnet ring 125 have the same axial position, and the outer lower permanent magnet ring 124 and the inner lower permanent magnet ring 126 have the same axial position.

[0086] The upper end face of the outer upper permanent magnet ring 123 does not exceed the upper end face of the outer magnetic ring 121, the lower end face of the outer lower permanent magnet ring 124 does not exceed the lower end face of the outer magnetic ring 121, the upper end face of the inner upper permanent magnet ring 125 does not exceed the upper end face of the inner magnetic ring 122, the lower end face of the inner lower permanent magnet ring 126 does not exceed the lower end face of the inner magnetic ring 122, and there is an equal length of gap between the lower end face of the outer upper permanent magnet ring 123 and the upper end face of the outer lower permanent magnet ring 124, and between the lower end face of the inner upper permanent magnet ring 125 and the upper end face of the inner lower permanent magnet ring 126, with a gap length of 0~3mm;

[0087] The outer magnetic ring 121 and the inner magnetic ring 122 have the same axial length. The upper and lower end faces of the outer magnetic ring 121 and the inner magnetic ring 122 are coplanar. The radial length of the outer magnetic ring 121 is equal to the radial length of the inner magnetic ring 122. The outer magnetic ring 121 and the inner magnetic ring 122 are strictly coaxially installed.

[0088] Preferably, the upper end face of the outer magnetic ring 121 is tightly attached to the outer mounting end face of the mover structure 11, and the outer circular surface of the outer magnetic ring 121 is tightly and firmly connected to the outer wall of the annular groove 111 by temperature difference interference fitting. The upper end face of the upper outer permanent magnet ring 123 is flush with the upper end face of the outer magnetic ring 121, and the outer circular surface of the upper outer permanent magnet ring 123 is tightly and firmly connected to the inner circular surface of the outer magnetic ring 121 by epoxy resin adhesive. The lower end face of the lower outer permanent magnet ring 124 is flush with the lower end face of the outer magnetic ring 121. An outer magnetic separator ring is provided between the upper end face of the lower outer permanent magnet ring 124 and the lower end face of the upper outer permanent magnet ring 123, and the axial length of the outer magnetic separator ring is [missing information]. The outer magnetic isolation ring has a diameter of 2-3mm. Its inner and outer diameters are consistent with those of the upper and lower permanent magnet rings 123 and 124. The outer magnetic isolation ring is made of a non-magnetic metal such as aluminum alloy. The outer surface of the outer magnetic isolation ring is firmly bonded to the inner surface of the outer magnetic ring 121 using epoxy resin adhesive. The upper end face of the outer magnetic isolation ring is firmly bonded to the lower end face of the upper permanent magnet ring 123 using epoxy resin adhesive. The outer surface of the lower permanent magnet ring 124 is firmly bonded to the inner surface of the outer magnetic ring 121 using epoxy resin adhesive. The upper end face of the lower permanent magnet ring 124 is firmly bonded to the lower end face of the outer magnetic isolation ring using epoxy resin adhesive. The upper end face of the inner magnetic ring 122 is tightly attached to the inner mounting end face of the moving part 11. The inner circular surface of the inner magnetic ring 122 is tightly and firmly connected to the inner wall of the annular groove 111 by temperature difference interference fit. The upper end face of the inner upper permanent magnet ring 125 is flush with the upper end face of the inner magnetic ring 122. The inner circular surface of the inner upper permanent magnet ring 125 is tightly and firmly connected to the outer circular surface of the inner magnetic ring 122 by epoxy resin adhesive. The lower end face of the inner lower permanent magnet ring 126 is flush with the lower end face of the inner magnetic ring 122. An inner magnetic separator ring is provided between the upper end face of the inner lower permanent magnet ring 126 and the lower end face of the inner upper permanent magnet ring 125. The axial direction of the inner magnetic separator ring and the outer magnetic separator ring is... The inner and outer diameters of the inner magnetic isolation ring are consistent with those of the inner upper permanent magnet ring 125 and the inner lower permanent magnet ring 126. The inner magnetic isolation ring is made of a non-magnetic metal material such as aluminum alloy. The inner circular surface of the inner magnetic isolation ring is firmly connected to the outer circular surface of the inner magnetic guide ring 122 with epoxy resin. The upper end surface of the inner magnetic isolation ring is firmly connected to the lower end surface of the inner upper permanent magnet ring 125 with epoxy resin. The outer circular surface of the inner lower permanent magnet ring 126 is firmly connected to the inner circular surface of the inner magnetic guide ring 122 with epoxy resin. The upper end surface of the inner lower permanent magnet ring 126 is firmly connected to the lower end surface of the inner magnetic isolation ring with epoxy resin.

[0089] In some embodiments, the upper end face of the outer magnetic ring 121 is tightly attached to the outer mounting end face of the mover structure 11, and the outer circular surface of the outer magnetic ring 121 is firmly connected to the outer wall of the annular groove 111 with epoxy resin adhesive. The upper end face of the upper outer permanent magnet ring 123 is flush with the upper end face of the outer magnetic ring 121, and the outer circular surface of the upper outer permanent magnet ring 123 is firmly connected to the inner circular surface of the outer magnetic ring 121 with epoxy resin adhesive. The lower end face of the lower outer permanent magnet ring 124 is flush with the lower end face of the outer magnetic ring 121, and there is no gap between the upper end face of the lower outer permanent magnet ring 124 and the upper outer permanent magnet ring 123. The outer circular surface of the lower outer permanent magnet ring 124 is firmly connected to the inner circular surface of the outer magnetic ring 121 with epoxy resin adhesive, and the upper end face of the lower outer permanent magnet ring 124 is firmly attached to the lower end face of the upper outer permanent magnet ring 123 with epoxy resin adhesive. The inner magnetic ring 122 is tightly attached to the inner mounting end face of the moving part 11. The inner circular surface of the inner magnetic ring 122 is firmly attached to the inner wall of the annular groove 111 with epoxy resin adhesive. The upper end face of the inner upper permanent magnet ring 125 is flush with the upper end face of the inner magnetic ring 122. The inner circular surface of the inner upper permanent magnet ring 125 is firmly attached to the outer circular surface of the inner magnetic ring 122 with epoxy resin adhesive. The lower end face of the permanent magnet ring 126 is flush with the lower end face of the inner magnetic ring 122. The upper end face of the lower inner permanent magnet ring 126 is zero-gap with the upper inner permanent magnet ring 125. The outer circular surface of the lower inner permanent magnet ring 126 is firmly connected to the inner circular surface of the inner magnetic ring 122 with epoxy resin. The upper end face of the lower inner permanent magnet ring 126 is firmly connected to the lower end face of the upper inner permanent magnet ring 125 with epoxy resin.

[0090] The inner and outer circular surfaces of the magnetic bearing stator 2 are respectively separated from the outer circular surfaces of the inner upper permanent magnet ring 125 and inner lower permanent magnet ring 126 of the mover assembly 12, as well as the inner circular surfaces of the outer upper permanent magnet ring 123 and outer lower permanent magnet ring 124 by equal gaps of 0.3~0.8mm. The axial positions of the upper and lower wires of the coil 22 of the magnetic bearing stator 2 are respectively located between the axial positions of the inner upper permanent magnet ring 125, outer upper permanent magnet ring 123, outer lower permanent magnet ring 124, and inner lower permanent magnet ring 126 of the mover assembly 12, and do not exceed the axial positions of the inner upper permanent magnet ring 125, outer upper permanent magnet ring 123, outer lower permanent magnet ring 124, and inner lower permanent magnet ring 126. A gap of 2~5mm is left between the top of the magnetic bearing stator 2 and the bottom of the annular groove 111 of the mover structure 11.

[0091] Reference Appendix Figure 5 The specific structure of the mover assembly 12 of the three-degree-of-freedom Lorentz force magnetic bearing of the single-sided Halbach permanent magnet array is as follows;

[0092] The outer wall portion includes an outer magnetic ring 121, an outer upper permanent magnet ring 123, an outer middle permanent magnet ring 1213, and an outer lower permanent magnet ring 124, while the inner wall portion includes an inner magnetic ring 122.

[0093] The outer magnetic ring 121 is disposed on the outer wall of the annular groove 111, the inner magnetic ring 122 is disposed on the inner wall of the annular groove 111, and the outer upper permanent magnet ring 123, the outer middle permanent magnet ring 1213 and the outer lower permanent magnet ring 124 are sequentially disposed on the inner wall of the outer magnetic ring 121.

[0094] The outer upper permanent magnet ring 123, the outer middle permanent magnet ring 1213, and the outer lower permanent magnet ring 124 constitute an orthogonal Halbach permanent magnet array;

[0095] The outer side of the magnetic bearing stator 2 has a working air gap 3 with the outer upper permanent magnet ring 123, the outer middle permanent magnet ring 1213 and the outer lower permanent magnet ring 124, and the inner side has a working air gap 3 with the inner magnetic guide ring 122.

[0096] Preferably, a working air gap is provided between the inner circular surface of the outer upper permanent magnet ring 123, the outer middle permanent magnet ring 1213, and the outer lower permanent magnet ring 124 and the outer circular surface of the inner magnetic ring 122, and the length of the working air gap 3 is 4~8mm.

[0097] Preferably, the outer magnetic ring 121 and the inner magnetic ring 122 are precision-machined from metal materials with good magnetic permeability, such as 1J50 and No. 10 steel; the outer upper permanent magnet ring 123, the outer middle permanent magnet ring 1213, and the outer lower permanent magnet ring 124 are made of sintered rare earth permanent magnet materials such as neodymium iron boron or samarium cobalt, and are assembled from separately manufactured magnets into an integral ring. The outer upper permanent magnet ring 123 is radially magnetized (NS), the outer middle permanent magnet ring 1213 is axially magnetized (SN), and the outer lower permanent magnet ring 124 is radially magnetized (SN).

[0098] Reference Appendix Figure 6 The magnetomotive force of the outer upper permanent magnet ring 123, the outer middle permanent magnet ring 1213, and the outer lower permanent magnet ring 124 forms a closed magnetic flux loop through the outer magnetic guide ring 121, the outer lower permanent magnet ring 124, the working air gap 3, the inner magnetic guide ring 122, the working air gap 3, the outer upper permanent magnet ring 123, and the outer magnetic guide ring 121.

[0099] The outer upper permanent magnet ring 123, outer middle permanent magnet ring 1213, and outer lower permanent magnet ring 124 of the mover assembly 12 have the same radial length, and the outer upper permanent magnet ring 123 and outer lower permanent magnet ring 124 have the same axial length.

[0100] The upper end face of the outer upper permanent magnet ring 123 does not extend beyond the upper end face of the outer magnetic ring 121, the upper end face of the outer middle permanent magnet ring 1213 abuts against the lower end face of the outer upper permanent magnet ring 123, the upper end face of the outer lower permanent magnet ring 124 abuts against the lower end face of the outer middle permanent magnet ring 1213, and the lower end face of the outer lower permanent magnet ring 124 does not extend beyond the lower end face of the outer magnetic ring 121.

[0101] The outer magnetic ring 121 and the inner magnetic ring 122 have the same axial length. The upper and lower end faces of the outer magnetic ring 121 and the inner magnetic ring 122 are coplanar. The radial length of the outer magnetic ring 121 is greater than the radial length of the inner magnetic ring 122. The outer magnetic ring 121 and the inner magnetic ring 122 are strictly coaxially installed.

[0102] Preferably, the upper end face of the outer magnetic ring 121 is in close contact with the outer mounting end face of the mover structure 11, and the outer circular surface of the outer magnetic ring 121 is in close contact with the outer mounting circular surface of the mover structure 11 through temperature difference interference fit. The upper end face of the outer upper permanent magnet ring 123 is flush with the upper end face of the outer magnetic ring 121, and the outer circular surface of the outer upper permanent magnet ring 123 is in close contact with the inner circular surface of the outer magnetic ring 121 using epoxy resin adhesive. The upper end face of the outer middle permanent magnet ring 1213 is in close contact with the lower end face of the outer middle permanent magnet ring 123 using epoxy resin adhesive. The outer circular surface of the outer middle permanent magnet ring 1213 is in close contact with the outer magnetic ring 121. The inner circular surface of ring 121 is firmly connected with epoxy resin. The upper end face of the outer lower permanent magnet ring 124 is firmly connected with the lower end face of the outer middle permanent magnet ring 1213 with epoxy resin. The lower end face of the outer lower permanent magnet ring 124 is flush with the lower end face of the outer magnetic ring 121. The outer circular surface of the outer lower permanent magnet ring 124 is firmly connected with the inner circular surface of the outer magnetic ring 121 with epoxy resin. The upper end face of the inner magnetic ring 122 is in close contact with the inner mounting end face of the mover structure 11. The inner circular surface of the inner magnetic ring 122 is firmly connected with the inner mounting circular surface of the mover structure 11 through temperature difference interference fit.

[0103] In some embodiments, the upper end face of the outer magnetic ring 121 is firmly connected to the outer mounting end face of the mover structure 11 with epoxy resin adhesive, the outer circular surface of the outer magnetic ring 121 is firmly connected to the outer mounting circular surface of the mover structure 11 with epoxy resin adhesive, the upper end face of the outer upper permanent magnet ring 123 is flush with the upper end face of the outer magnetic ring 121, the outer circular surface of the outer upper permanent magnet ring 123 is firmly connected to the inner circular surface of the outer magnetic ring 121 with epoxy resin adhesive, the upper end face of the outer middle permanent magnet ring 1213 is firmly connected to the lower end face of the outer middle permanent magnet ring 123 with epoxy resin adhesive, and the outer circular surface of the outer middle permanent magnet ring 1213 is firmly connected to the outer... The inner circular surface of the magnetic guide ring 121 is firmly connected with epoxy resin. The upper end face of the outer lower permanent magnet ring 124 is firmly connected with the lower end face of the outer middle permanent magnet ring 1213 with epoxy resin. The lower end face of the outer lower permanent magnet ring 124 is flush with the lower end face of the outer magnetic guide ring 121. The outer circular surface of the outer lower permanent magnet ring 124 is firmly connected with the inner circular surface of the outer magnetic guide ring 121 with epoxy resin. The upper end face of the inner magnetic guide ring 122 is firmly connected with the inner mounting end face of the mover structure 11 with epoxy resin. The inner circular surface of the inner magnetic guide ring 122 is firmly connected with the inner mounting circular surface of the mover structure 11 with epoxy resin.

[0104] In some embodiments, the inner and outer circular surfaces of the magnetic bearing stator 2 are respectively separated from the outer circular surface of the inner magnetic ring 122 of the mover assembly 12 and the inner circular surfaces of the upper and lower permanent magnet rings 123 and 124 by equal gaps of 0.3 to 0.8 mm; the axial positions of the upper and lower edges of the coil 22 of the magnetic bearing stator 2 are respectively located between the axial positions of the upper and lower permanent magnet rings 123 and 124 of the mover assembly 12, and do not exceed the axial positions of the upper and lower permanent magnet rings 123 and 124; and a gap of 2 to 5 mm is left between the top end of the magnetic bearing stator 2 and the annular groove 111.

[0105] Reference Appendix Figure 7 The specific structure of the mover assembly 12 of the three-degree-of-freedom Lorentz force magnetic bearing with double-sided Halbach permanent magnet array is as follows;

[0106] The outer wall of the mover assembly 12 of the three-degree-of-freedom Lorentz magnetic bearing with a double-sided Halbach permanent magnet array is the same as that of the single-sided Halbach permanent magnet array three-degree-of-freedom Lorentz magnetic bearing. The difference lies in the inner wall. Specifically, the inner wall of the mover assembly 12 of the three-degree-of-freedom Lorentz magnetic bearing with a double-sided Halbach permanent magnet array further includes: an inner upper permanent magnet ring 125, an inner middle permanent magnet ring 1214, and an inner lower permanent magnet ring 126. The specific structure of the three-degree-of-freedom Lorentz magnetic bearing with a double-sided Halbach permanent magnet array is as follows:

[0107] The outer wall portion includes an outer magnetic ring 121, an outer upper permanent magnet ring 123, an outer middle permanent magnet ring 1213, and an outer lower permanent magnet ring 124; the inner wall portion includes an inner magnetic ring 122, an inner upper permanent magnet ring 125, an inner middle permanent magnet ring 1214, and an inner lower permanent magnet ring 126.

[0108] The outer magnetic ring 121 is disposed on the outer wall of the annular groove 111, and the inner magnetic ring 122 is disposed on the inner wall of the annular groove 111. The outer upper permanent magnet ring 123, the outer middle permanent magnet ring 1213, and the outer lower permanent magnet ring 124 are sequentially disposed on the inner wall of the outer magnetic ring 121; the inner upper permanent magnet ring 125, the inner middle permanent magnet ring 1214, and the inner lower permanent magnet ring 126 are sequentially disposed on the outer wall of the inner magnetic ring 122.

[0109] The outer upper permanent magnet ring 123, the outer middle permanent magnet ring 1213 and the outer lower permanent magnet ring 124 form an orthogonal Halbach permanent magnet array; the inner upper permanent magnet ring 125, the inner middle permanent magnet ring 1214 and the inner lower permanent magnet ring 126 form an orthogonal Halbach permanent magnet array.

[0110] The outer side of the magnetic bearing stator 2 has a working air gap 3 with the outer upper permanent magnet ring 123, the outer middle permanent magnet ring 1213 and the outer lower permanent magnet ring 124, and the inner side has a working air gap 3 with the inner upper permanent magnet ring 125, the inner middle permanent magnet ring 1214 and the inner lower permanent magnet ring 126.

[0111] Preferably, a working air gap 3 is provided between the inner circular surface of the outer upper permanent magnet ring 123 and the outer circular surface of the inner upper permanent magnet ring 125, and between the inner circular surface of the outer lower permanent magnet ring 124 and the outer circular surface of the inner lower permanent magnet ring 126, and the length of the working air gap 3 is 4~8mm.

[0112] The outer magnetic ring 121 and the inner magnetic ring 122 are precision-machined from metal materials with good magnetic permeability, such as 1J50 and No. 10 steel. The outer upper permanent magnet ring 123, the outer middle permanent magnet ring 1213, the outer lower permanent magnet ring 124, the inner upper permanent magnet ring 125, the inner middle permanent magnet ring 1214, and the inner lower permanent magnet ring 126 are made of sintered rare earth permanent magnet materials such as neodymium iron boron or samarium cobalt. They are assembled from separately manufactured magnets into a whole circular ring. The outer upper permanent magnet ring 123 is radially magnetized (NS), the outer middle permanent magnet ring 1213 is axially magnetized (SN), the outer lower permanent magnet ring 124 is radially magnetized (SN), the inner upper permanent magnet ring 125 is radially magnetized (NS), the inner middle permanent magnet ring 1214 is axially magnetized (NS), and the inner lower permanent magnet ring 126 is radially magnetized (SN).

[0113] Reference Appendix Figure 8The magnetomotive force of the outer upper permanent magnet ring 123, outer middle permanent magnet ring 1213, outer lower permanent magnet ring 124, inner upper permanent magnet ring 125, inner middle permanent magnet ring 1214, and inner lower permanent magnet ring 126 forms a closed magnetic flux loop through the outer magnetic guide ring 121, outer lower permanent magnet ring 124, working air gap 3, inner lower permanent magnet ring 126, inner magnetic guide ring 122, inner upper permanent magnet ring 125, working air gap 3, outer upper permanent magnet ring 123, and outer magnetic guide ring 121.

[0114] The outer upper permanent magnet ring 123, outer middle permanent magnet ring 1213, and outer lower permanent magnet ring 124 of the mover assembly 12 have the same radial length; the inner upper permanent magnet ring 125, inner middle permanent magnet ring 1214, and inner lower permanent magnet ring 126 have the same radial length; the outer upper permanent magnet ring 123, outer lower permanent magnet ring 124, inner upper permanent magnet ring 125, and inner lower permanent magnet ring 126 have the same axial length; the outer middle permanent magnet ring 1213 and inner middle permanent magnet ring 1214 have the same axial length; the outer upper permanent magnet ring 123 and inner upper permanent magnet ring 125 have the same axial position; and the outer lower permanent magnet ring 124 and inner lower permanent magnet ring 126 have the same axial position.

[0115] The upper end face of the outer upper permanent magnet ring 123 does not extend beyond the upper end face of the outer magnetic ring 121; the upper end face of the outer middle permanent magnet ring 1213 abuts against the lower end face of the outer upper permanent magnet ring 123; the upper end face of the outer lower permanent magnet ring 124 abuts against the lower end face of the outer middle permanent magnet ring 1213; the lower end face of the outer lower permanent magnet ring 124 does not extend beyond the lower end face of the outer magnetic ring 121; the upper end face of the inner upper permanent magnet ring 125 does not extend beyond the upper end face of the inner magnetic ring 122; the upper end face of the inner middle permanent magnet ring 1214 abuts against the lower end face of the inner upper permanent magnet ring 125; the upper end face of the inner lower permanent magnet ring 126 abuts against the lower end face of the inner middle permanent magnet ring 1214; the lower end face of the inner lower permanent magnet ring 126 does not extend beyond the lower end face of the inner magnetic ring 122.

[0116] The outer magnetic ring 121 and the inner magnetic ring 122 have the same axial length. The upper and lower end faces of the outer magnetic ring 121 and the inner magnetic ring 122 are coplanar. The radial length of the outer magnetic ring 121 is equal to the radial length of the inner magnetic ring 122. The outer magnetic ring 121 and the inner magnetic ring 122 are strictly coaxially installed.

[0117] Preferably, the upper end face of the outer magnetic ring 121 is in close contact with the outer mounting end face of the mover structure 11, and the outer circular surface of the outer magnetic ring 121 is tightly and firmly connected to the outer mounting circular surface of the mover structure 11 by temperature difference interference fit. The upper end face of the outer upper permanent magnet ring 123 is flush with the upper end face of the outer magnetic ring 121, and the outer circular surface of the outer upper permanent magnet ring 123 is tightly and firmly connected to the inner circular surface of the outer magnetic ring 121 by epoxy resin adhesive. The upper end face of the outer middle permanent magnet ring 1213 is... The lower end face of the outer upper permanent magnet ring 123 is firmly bonded to the outer middle permanent magnet ring 1213 with epoxy resin. The outer circular surface of the outer middle permanent magnet ring 1213 is firmly bonded to the inner circular surface of the outer magnetic guide ring 121 with epoxy resin. The upper end face of the outer lower permanent magnet ring 124 is firmly bonded to the lower end face of the outer middle permanent magnet ring 1213 with epoxy resin. The lower end face of the outer lower permanent magnet ring 124 is flush with the lower end face of the outer magnetic guide ring 121. The outer circular surface of the outer lower permanent magnet ring 124 is flush with the lower end face of the outer magnetic guide ring 121. The inner circular surface of the magnetic ring 121 is firmly bonded with epoxy resin adhesive; the upper end face of the inner magnetic ring 122 is tightly attached to the inner mounting end face of the moving part 11, and the inner circular surface of the inner magnetic ring 122 and the inner mounting circular surface of the moving part 11 are firmly bonded with epoxy resin adhesive through temperature difference interference fit; the upper end face of the inner upper permanent magnet ring 125 is flush with the upper end face of the inner magnetic ring 122, and the inner circular surface of the inner upper permanent magnet ring 125 and the outer circular surface of the inner magnetic ring 122 are firmly bonded with epoxy resin adhesive. The inner permanent magnet ring 1214 and the inner upper permanent magnet ring 125 are firmly connected by epoxy resin adhesive. The inner circular surface of the inner permanent magnet ring 1214 and the outer circular surface of the inner magnetic ring 122 are firmly connected by epoxy resin adhesive. The lower end surface of the inner lower permanent magnet ring 126 is flush with the lower end surface of the inner magnetic ring 122. The inner circular surface of the inner lower permanent magnet ring 126 and the outer circular surface of the inner magnetic ring 122 are firmly connected by epoxy resin adhesive.

[0118] In some embodiments, the upper end face of the outer magnetic ring 121 is firmly connected to the outer mounting end face of the mover structure 11 with epoxy resin adhesive, the outer circular surface of the outer magnetic ring 121 is firmly connected to the outer mounting circular surface of the mover structure 11 with epoxy resin adhesive, the upper end face of the outer upper permanent magnet ring 123 is flush with the upper end face of the outer magnetic ring 121, and the outer circular surface of the outer upper permanent magnet ring 123 is firmly connected to the inner circular surface of the outer magnetic ring 121 with epoxy resin adhesive. The upper end face of 213 is firmly connected to the lower end face of the outer upper permanent magnet ring 123 with epoxy resin adhesive. The outer circular surface of the outer middle permanent magnet ring 1213 is firmly connected to the inner circular surface of the outer magnetic guide ring 121 with epoxy resin adhesive. The upper end face of the outer lower permanent magnet ring 124 is firmly connected to the lower end face of the outer middle permanent magnet ring 1213 with epoxy resin adhesive. The lower end face of the outer lower permanent magnet ring 124 is flush with the lower end face of the outer magnetic guide ring 121. The outer circular surface of the outer lower permanent magnet ring 124 is flush with the lower end face of the outer magnetic guide ring 121. The inner circular surface of the outer magnetic ring 121 is firmly bonded to the outer magnetic ring 122 with epoxy resin adhesive; the upper end face of the inner magnetic ring 122 is firmly bonded to the inner mounting end face of the moving part 11 with epoxy resin adhesive; the upper end face of the inner upper permanent magnet ring 125 is flush with the upper end face of the inner magnetic ring 122; the inner circular surface of the inner upper permanent magnet ring 125 is bonded to the outer circular surface of the inner magnetic ring 122 with epoxy resin adhesive. The inner permanent magnet ring 1214 and the inner upper permanent magnet ring 125 are firmly bonded together with epoxy resin. The inner circular surface of the inner permanent magnet ring 1214 and the outer circular surface of the inner magnetic ring 122 are also firmly bonded together with epoxy resin. The lower end face of the inner lower permanent magnet ring 126 is flush with the lower end face of the inner magnetic ring 122. The inner circular surface of the inner lower permanent magnet ring 126 and the outer circular surface of the inner magnetic ring 122 are also firmly bonded together with epoxy resin.

[0119] In some embodiments, the inner and outer circular surfaces of the magnetic bearing stator 2 are respectively separated from the outer circular surfaces of the inner upper permanent magnet ring 125 and inner lower permanent magnet ring 126 of the mover assembly 12, as well as the inner circular surfaces of the outer upper permanent magnet ring 123 and outer lower permanent magnet ring 124 by equal gaps of 0.3 to 0.8 mm; the axial positions of the upper and lower edges of the coil 22 of the magnetic bearing stator 2 are respectively located between the axial positions of the upper and lower permanent magnet rings of the mover assembly 12, and do not exceed the axial positions of the upper and lower permanent magnet rings; a gap of 2 to 5 mm is left between the top end of the magnetic bearing stator 2 and the annular groove 111.

[0120] Reference Appendix Figure 9 The specific structure of the mover assembly 12 of the three-degree-of-freedom Lorentz force magnetic bearing with a single axial permanent magnet is as follows:

[0121] The outer wall portion includes an upper outer magnetic ring 127, a lower outer magnetic ring 128, and an outer permanent magnet ring 129; the inner wall portion includes an inner magnetic ring 122.

[0122] The outer upper magnetic ring 127, the outer permanent magnet ring 129 and the outer lower magnetic ring 128 are sequentially arranged on the outer wall of the annular groove 111, and the inner magnetic ring 122 is arranged on the inner wall of the annular groove 111.

[0123] The outer side of the magnetic bearing stator 2 has a working air gap 3 with the outer upper magnetic ring 127, the outer permanent magnet ring 129 and the outer lower magnetic ring 128, and the inner side has a working air gap 3 with the inner magnetic ring 122.

[0124] In one specific embodiment, the outer wall portion of the mover assembly 12 includes an outer permanent magnet ring 129, an outer upper magnetic ring 127 and an outer lower magnetic ring 128, and the inner wall portion includes an inner magnetic ring 122.

[0125] An outer permanent magnet ring 129 is provided between the outer upper magnetic ring 127 and the outer lower magnetic ring 128. A working air gap 3 is provided between the inner magnetic ring 122 and the outer upper magnetic ring 127 and the outer lower magnetic ring 128. The length of the working air gap 3 is 4~8mm.

[0126] The outer upper magnetic ring 127 and the outer lower magnetic ring 128 have the same dimensions. The outer diameter of the outer permanent magnet ring 129 is equal to the outer diameters of the outer upper magnetic ring 127 and the outer lower magnetic ring 128. The inner diameter of the outer permanent magnet ring 129 is not less than the inner diameters of the outer upper magnetic ring 127 and the outer lower magnetic ring 128. The axial length of the inner magnetic ring 122 is not less than the sum of the axial lengths of the outer upper magnetic ring 127, the outer lower magnetic ring 128 and the outer permanent magnet ring 129. The radial length of the inner magnetic ring 122 is not greater than the radial lengths of the outer upper magnetic ring 127 and the outer lower magnetic ring 128.

[0127] The outer upper magnetic ring 127, outer lower magnetic ring 128, and inner magnetic ring 122 are precision machined from metal materials with good magnetic permeability, such as No. 10 steel and 1J50; the outer permanent magnet ring 129 is made of sintered rare earth permanent magnet materials such as neodymium iron boron or samarium cobalt, and is assembled from separately manufactured magnets into a whole circular ring.

[0128] The outer upper magnetic ring 127, outer lower magnetic ring 128, and inner magnetic ring 122 are strictly coaxially installed. The upper end face of the outer permanent magnet ring 129 is tightly and firmly connected to the lower end face of the outer upper magnetic ring 127, and the upper end face of the outer lower magnetic ring 128 is tightly and firmly connected to the lower end face of the outer permanent magnet ring 129.

[0129] Reference Appendix Figure 10The outer permanent magnet ring 129 is axially magnetized, and the magnetomotive force of the outer permanent magnet ring 129 forms a circumferential uniform air gap magnetic flux in the working air gap 3 through the outer lower magnetic guide ring 128, the inner magnetic guide ring 122, the outer upper magnetic guide ring 127, and the outer permanent magnet ring 129.

[0130] To ensure the coaxiality of the installation of each magnetic ring, preferably, the upper end face of the outer upper magnetic ring 127 is in close contact with the outer mounting end face of the moving part 11, the outer circular surface of the outer upper magnetic ring 127 is tightly and firmly connected to the outer wall of the annular groove 111 by temperature difference interference fit, the upper end face of the outer permanent magnet ring 129 is tightly and firmly connected to the lower end face of the outer upper magnetic ring 127 by epoxy resin adhesive, and the outer circular surface of the outer permanent magnet ring 129 is connected to the outer wall of the annular groove 111 by epoxy resin adhesive. The outer lower magnetic ring 128 and the lower end face of the outer permanent magnet ring 129 are firmly connected by epoxy resin adhesive. The outer circular surface of the outer lower magnetic ring 128 and the outer wall of the annular groove 111 are firmly connected by thermal interference fit. The upper end face of the inner magnetic ring 122 is tightly attached to the inner mounting end face of the moving part 11. The inner circular surface of the inner magnetic ring 122 and the inner wall of the annular groove 111 are firmly connected by thermal interference fit.

[0131] In some embodiments, the upper end face of the outer upper magnetic ring 127 is firmly connected to the outer mounting end face of the mover structure 11 with epoxy resin adhesive, the outer circular surface of the outer upper magnetic ring 127 is firmly connected to the outer wall of the annular groove 111 with epoxy resin adhesive, the upper end face of the outer permanent magnet ring 129 is firmly connected to the lower end face of the outer upper magnetic ring 127 with epoxy resin adhesive, and the outer circular surface of the outer permanent magnet ring 129 is firmly attached to the outer wall of the annular groove 111 with epoxy resin adhesive. The outer lower magnetic ring 128 is firmly connected to the lower end of the outer permanent magnet ring 129 with epoxy resin adhesive. The outer circular surface of the outer lower magnetic ring 128 is firmly connected to the outer wall of the annular groove 111 with epoxy resin adhesive. The upper end of the inner magnetic ring 122 is firmly connected to the inner mounting end of the mover structure 11 with epoxy resin adhesive. The inner circular surface of the inner magnetic ring 122 is firmly connected to the inner wall of the annular groove 111 with epoxy resin adhesive.

[0132] Reference Appendix Figure 11 The specific structure of the mover assembly 12 of the three-degree-of-freedom Lorentz force magnetic bearing with axial dual permanent magnets is as follows:

[0133] The outer wall of the mover assembly 12 of the axial dual permanent magnet three-degree-of-freedom Lorentz force magnetic bearing is the same as that of the axial single permanent magnet three-degree-of-freedom Lorentz force magnetic bearing. The difference lies in the inner wall. Specifically, the inner wall of the mover assembly 12 of the axial dual permanent magnet three-degree-of-freedom Lorentz force magnetic bearing includes an inner upper magnetic ring 1210, an inner lower magnetic ring 1211, and an inner permanent magnet ring 1212.

[0134] The outer upper magnetic ring 127, the outer permanent magnet ring 129 and the outer lower magnetic ring 128 are sequentially arranged on the outer wall of the annular groove 111, and the inner upper magnetic ring 1210, the inner permanent magnet ring 1212 and the inner lower magnetic ring 1211 are sequentially arranged on the inner wall of the annular groove 111.

[0135] The outer side of the magnetic bearing stator 2 has a working air gap 3 with the outer upper magnetic guide ring 127, the outer permanent magnet ring 129 and the outer lower magnetic guide ring 128, and the inner side has a working air gap 3 with the inner upper magnetic guide ring 1210, the inner permanent magnet ring 1212 and the inner lower magnetic guide ring 1211.

[0136] Specifically, an outer permanent magnet ring 129 is provided between the outer upper magnetic ring 127 and the outer lower magnetic ring 128, and an inner permanent magnet ring 1212 is provided between the inner upper magnetic ring 1210 and the inner lower magnetic ring 1211. A working air gap 3 is provided between the inner upper magnetic ring 1210 and the outer upper magnetic ring 127, and between the inner lower magnetic ring 1211 and the outer lower magnetic ring 128. The length of the working air gap 3 is 4~8mm.

[0137] The outer upper magnetic ring 127 and the outer lower magnetic ring 128 have the same dimensions, and the inner upper magnetic ring 1210 and the inner lower magnetic ring 1211 have the same dimensions. The axial and radial lengths of the outer upper magnetic ring 127, the outer lower magnetic ring 128, the inner upper magnetic ring 1210, and the inner lower magnetic ring 1211 are the same. The axial and radial lengths of the outer permanent magnet ring 129 and the inner permanent magnet ring 1212 are the same. The outer diameter of the outer upper magnetic ring 127 and the outer lower magnetic ring 128 is equal to the outer diameter of the outer permanent magnet ring 129. The inner diameter of the outer permanent magnet ring 129 is not less than the inner diameter of the outer upper magnetic ring 127 and the outer lower magnetic ring 128. The inner diameter of the inner permanent magnet ring 1212 is equal to the inner diameter of the inner upper magnetic ring 1210 and the inner lower magnetic ring 1211. The outer diameter of the inner permanent magnet ring 1212 is not greater than the outer diameter of the inner upper magnetic ring 1210 and the inner lower magnetic ring 1211.

[0138] The outer upper magnetic ring 127, outer lower magnetic ring 128, inner upper magnetic ring 1210, and inner lower magnetic ring 1211 are precision machined from metal materials with good magnetic permeability, such as No. 10 steel and 1J50 steel; the outer permanent magnet ring 129 and inner permanent magnet ring 1212 are made of sintered rare earth permanent magnet materials, such as neodymium iron boron or samarium cobalt materials, and are assembled from separately manufactured magnets into a whole circular ring;

[0139] The outer upper magnetic ring 127, outer lower magnetic ring 128, inner upper magnetic ring 1210, and inner lower magnetic ring 1211 are strictly coaxially installed. The upper end face of the outer permanent magnet ring 129 is tightly and firmly connected to the lower end face of the outer upper magnetic ring 127. The upper end face of the outer lower magnetic ring 128 is tightly and firmly connected to the lower end face of the outer permanent magnet ring 129. The upper end face of the inner permanent magnet ring 1212 is tightly and firmly connected to the lower end face of the inner upper magnetic ring 1210. The upper end face of the inner lower magnetic ring 1211 is tightly and firmly connected to the lower end face of the inner permanent magnet ring 1212.

[0140] Reference Appendix Figure 12 The outer permanent magnet ring 129 is magnetized along the NS axis, and the inner permanent magnet ring 1212 is magnetized along the SN axis. The magnetomotive force of the outer permanent magnet ring 129 and the inner permanent magnet ring 1212 forms a circumferentially uniform air gap magnetic flux in the working air gap 3 through the outer lower magnetic guide ring 128, the inner lower magnetic guide ring 1211, the inner permanent magnet ring 1212, the inner upper magnetic guide ring 1210, the outer upper magnetic guide ring 127, and the outer permanent magnet ring 129.

[0141] To ensure the coaxiality of the installation of each magnetic ring, preferably, the upper end face of the upper outer magnetic ring 127 is tightly attached to the outer mounting end face of the moving part 11, and the outer circular surface of the upper outer magnetic ring 127 is tightly and firmly connected to the outer wall of the annular groove 111 by thermal interference fit. The upper end face of the outer permanent magnet ring 129 is tightly and firmly connected to the lower end face of the upper outer magnetic ring 127 by epoxy resin adhesive, and the outer circular surface of the outer permanent magnet ring 129 is tightly and firmly connected to the outer wall of the annular groove 111 by epoxy resin adhesive. The upper end face of the lower outer magnetic ring 128 is tightly and firmly connected to the lower end face of the outer permanent magnet ring 129 by epoxy resin adhesive, and the outer circular surface of the lower outer magnetic ring 128 is tightly attached to the outer wall of the annular groove 111 by thermal interference fit. The inner upper magnetic ring 1210 is firmly connected to the inner mounting end face of the moving part 11. The inner circular surface of the inner upper magnetic ring 1210 is firmly connected to the inner wall of the annular groove 111 through temperature difference interference fit. The upper end face of the inner permanent magnet ring 1212 is firmly connected to the lower end face of the inner upper magnetic ring 1210 with epoxy resin adhesive. The inner circular surface of the inner permanent magnet ring 1212 is firmly connected to the inner wall of the annular groove 111 with epoxy resin adhesive. The upper end face of the inner lower magnetic ring 1211 is firmly connected to the lower end face of the inner permanent magnet ring 1212 with epoxy resin adhesive. The inner circular surface of the inner lower magnetic ring 1211 is firmly connected to the inner wall of the annular groove 111 through temperature difference interference fit.

[0142] In some embodiments, the upper end face of the outer upper magnetic ring 127 is firmly connected to the outer mounting end face of the mover structure 11 with epoxy resin adhesive; the outer circular surface of the outer upper magnetic ring 127 is firmly connected to the outer wall of the annular groove 111 with epoxy resin adhesive; the upper end face of the outer permanent magnet ring 129 is firmly connected to the lower end face of the outer upper magnetic ring 127 with epoxy resin adhesive; the outer circular surface of the outer permanent magnet ring 129 is firmly connected to the outer wall of the annular groove 111 with epoxy resin adhesive; the upper end face of the outer lower magnetic ring 128 is firmly connected to the lower end face of the outer permanent magnet ring 129 with epoxy resin adhesive; the outer circular surface of the outer lower magnetic ring 128 is firmly connected to the outer wall of the annular groove 111 with epoxy resin adhesive. The upper end face of the inner upper magnetic ring 1210 is firmly connected to the inner mounting end face of the mover structure 11 with epoxy resin adhesive, and the inner circular surface of the inner upper magnetic ring 1210 is firmly connected to the inner wall of the annular groove 111 with epoxy resin adhesive; the upper end face of the inner permanent magnet ring 1212 is firmly connected to the lower end face of the inner upper magnetic ring 1210 with epoxy resin adhesive, and the inner circular surface of the inner permanent magnet ring 1212 is firmly connected to the inner wall of the annular groove 111 with epoxy resin adhesive; the upper end face of the inner lower magnetic ring 1211 is firmly connected to the lower end face of the inner permanent magnet ring 1212 with epoxy resin adhesive, and the inner circular surface of the inner lower magnetic ring 1211 is firmly connected to the inner wall of the annular groove 111 with epoxy resin adhesive.

[0143] For the specific working principle of this utility model, please refer to the appendix. Figure 13 and attached Figure 14 Taking a case with three coils 22 as an example, the three coils are defined as coil 22A, coil 22B, and coil 22C. Coil 22A, coil 22B, and coil 22C are independently connected to control the current, generating three independently controlled axial forces. This achieves decoupled control of the three degrees of freedom: axial translation and radial rotation. The technical principle behind this is as follows:

[0144] When a single coil 22 is independently connected and current is passed through it, its stress condition is shown in the attached figure. Figure 2 Appendix Figure 4 Appendix Figure 6 Appendix Figure 8 Appendix Figure 10 Appendix Figure 12 The currents in the upper and lower wires of coil 22 are in opposite directions. The current in the upper wire of coil 22 is perpendicular to the paper and inwards, while the current in the lower wire of coil 22 is perpendicular to the paper and outwards. The magnetic flux in the upper and lower working air gaps 3 passes through the wires of coil 22, and the magnetic lines of force are perpendicular to the wires. Therefore, the upper and lower wires of coil 22 are subjected to the same Lorentz force. f z Function, Lorentz force f The magnitude of the Lorentz force is proportional to the product of the conductor current, the conductor length, and the air gap magnetic flux density. f zThe direction is determined by the left-hand rule, and in the case shown in the diagram, it is the positive direction of the Z-axis. Therefore, the net force on coil 22 is... F =2 f z According to the principle of action and reaction forces in Newton's laws of motion, the moving part 12 of the Lorentz magnetic bearing will be subjected to a force that is equal in magnitude and opposite in direction to the force on the coil 22.

[0145] Reference Appendix Figure 14 When equal and opposite control currents i are applied to coils 22B and 22C, coils 22B and 22C will experience equal and opposite Lorentz forces F. Therefore, the resultant force of all coils 22 is zero, and the resultant torque is the control torque in the radial X-axis direction. (Refer to Appendix) Figure 15 When a control current of 0.5i of equal magnitude and in the same direction is applied to coils 22B and 22C, coils 22B and 22C will experience a Lorentz force of 0.5F of equal magnitude and in the same direction. When a control current i is applied to coil 22A, with its direction opposite to that of the currents in coils 22B and 22C, coil 22A will experience a Lorentz force F in the opposite direction to that of coils 22B and 22C. Therefore, the resultant force of all coils 22 is zero, and the resultant torque is the control torque in the radial Y-axis direction. (Refer to Appendix) Figure 16 When a control current i of equal magnitude and same direction is applied to coils 22A, 22B, and 22C, coils 22A, 22B, and 22C will be subjected to Lorentz forces F of equal magnitude and same direction. The resultant torque of all coils 22 will be zero, generating a control force in the Z-axis direction.

[0146] Compared with existing technologies, the three-degree-of-freedom Lorentz magnetic bearing of this invention adopts a single-layer coil structure to achieve three degrees of freedom suspension control of axial translation and radial rotation, effectively reducing the volume and mass of the Lorentz magnetic bearing, thereby effectively reducing the product manufacturing cost. Another advantage of this invention is that when the number of coils is more than three, redundant control of the three degrees of freedom of the magnetic bearing can be achieved, improving the reliability of the product.

[0147] The above description is merely an embodiment and does not constitute any limitation on this utility model. Any person skilled in the art can make many possible variations, modifications, or alterations to the technical solution of this utility model without departing from its scope. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model, without departing from its scope, should fall within the protection scope of this utility model.

Claims

1. A three degree of freedom Lorentz force magnetic bearing characterized by, The magnetic bearing rotor (1) and the magnetic bearing stator (2) are included. The magnetic bearing stator (2) includes a cylindrical coil former (21) and at least three coils (22) arranged in an annular array on the coil former (21), and each coil (22) is independently connected to control current. The magnetic bearing rotor (1) includes a rotor structure (11) and a rotor assembly (12), the rotor structure (11) is a circular ring, and the circular ring outer end of the rotor structure (11) is inwardly recessed to provide an annular groove (111), and the annular groove (111) is concentric with the rotor structure (11). The rotor assembly (12) includes an outer wall part provided on the outer wall of the annular groove (111) and an inner wall part provided on the inner wall of the annular groove (111), and the magnetic bearing stator (2) is arranged between the outer wall part and the inner wall part, and the outer side of the magnetic bearing stator (2) and the outer wall part and the inner side of the magnetic bearing stator (2) and the inner wall part all have working air gaps (3).

2. The three degree of freedom Lorentz force magnetic bearing of claim 1, wherein, The coil former (21) is evenly provided with a plurality of grooves (211) in the number of coils (22) in the circumferential direction. Each of the grooves (211) is embedded with one of the coils (22).

3. The three degree of freedom Lorentz force magnetic bearing of claim 2, wherein, The middle of the groove (211) is provided with a positioning boss (212). The coil (22) is sleeved on the positioning boss (212), and the coil (22) and the inner wall of the groove (211) have a gap.

4. The three degree of freedom Lorentz force magnetic bearing of claim 1 wherein, The number of coils (22) is less than or equal to six.

5. The three degree of freedom Lorentz force magnetic bearing of any one of claims 1-4, wherein, The outer wall part includes an outer magnetic ring (121), an outer upper permanent magnet ring (123) and an outer lower permanent magnet ring (124), and the inner wall part includes an inner magnetic ring (122). The outer magnetic ring (121) is arranged on the outer wall of the annular groove (111), the inner magnetic ring (122) is arranged on the inner wall of the annular groove (111), and the outer upper permanent magnet ring (123) and the outer lower permanent magnet ring (124) are arranged on the inner wall of the outer magnetic ring (121) respectively. The outer side of the magnetic bearing stator (2) and the outer upper permanent magnet ring (123) and the outer lower permanent magnet ring (124) have working air gaps (3), and the inner side and the inner magnetic ring (122) have working air gaps (3).

6. The three degree of freedom Lorentz force magnetic bearing of claim 5, wherein, The outer upper permanent magnet ring (123) and the outer lower permanent magnet ring (124) are provided with an outer middle permanent magnet ring (1213) therebetween, and the outer upper permanent magnet ring (123), the outer middle permanent magnet ring (1213) and the outer lower permanent magnet ring (124) constitute a set of orthogonal halbach permanent magnet array.

7. The three degree of freedom Lorentz force magnetic bearing of claim 5 wherein, The inner wall part further includes an inner upper permanent magnet ring (125) and an inner lower permanent magnet ring (126). The inner upper permanent magnet ring (125) and the inner lower permanent magnet ring (126) are arranged on the outer wall of the inner magnetic ring (122) respectively. The outer side of the magnetic bearing stator (2) and the outer upper permanent magnet ring (123) and the outer lower permanent magnet ring (124) have working air gaps (3), and the inner side and the inner upper permanent magnet ring (125) and the inner lower permanent magnet ring (126) have working air gaps (3).

8. The three degree of freedom Lorentz force magnetic bearing of claim 7, wherein, An outer middle permanent magnet ring (1213) is arranged between the outer upper permanent magnet ring (123) and the outer lower permanent magnet ring (124), and the outer upper permanent magnet ring (123), the outer middle permanent magnet ring (1213) and the outer lower permanent magnet ring (124) constitute a set of orthogonal halbach permanent magnet arrays. An inner middle permanent magnet ring (1214) is arranged between the inner upper permanent magnet ring (125) and the inner lower permanent magnet ring (126), and the inner upper permanent magnet ring (125), the inner middle permanent magnet ring (1214) and the inner lower permanent magnet ring (126) constitute a set of orthogonal halbach permanent magnet arrays.

9. The three degree of freedom Lorentz force magnetic bearing of any one of claims 1-5, wherein, The outer wall part comprises an outer upper magnetic conducting ring (127), an outer lower magnetic conducting ring (128) and an outer permanent magnet ring (129), and the inner wall part comprises an inner magnetic conducting ring (122); The outer upper magnetic conducting ring (127), the outer permanent magnet ring (129) and the outer lower magnetic conducting ring (128) are sequentially arranged on the outer wall of the annular groove (111), and the inner upper magnetic conducting ring (1210), the inner permanent magnet ring (1212) and the inner lower magnetic conducting ring (1211) are sequentially arranged on the inner wall of the annular groove (111); The magnetic bearing stator (2) has a working air gap (3) on the outer side with the outer upper magnetic conducting ring (127), the outer permanent magnet ring (129) and the outer lower magnetic conducting ring (128), and has a working air gap (3) on the inner side with the inner magnetic conducting ring (122).

10. The three degree of freedom Lorentz force magnetic bearing of any one of claims 1-5, wherein, The outer wall part comprises an outer upper magnetic conducting ring (127), an outer lower magnetic conducting ring (128) and an outer permanent magnet ring (129), and the inner wall part comprises an inner upper magnetic conducting ring (1210), an inner lower magnetic conducting ring (1211) and an inner permanent magnet ring (1212); The outer upper magnetic conducting ring (127), the outer permanent magnet ring (129) and the outer lower magnetic conducting ring (128) are sequentially arranged on the outer wall of the annular groove (111), and the inner upper magnetic conducting ring (1210), the inner permanent magnet ring (1212) and the inner lower magnetic conducting ring (1211) are sequentially arranged on the inner wall of the annular groove (111); The magnetic bearing stator (2) has a working air gap (3) on the outer side with the outer upper magnetic conducting ring (127), the outer permanent magnet ring (129) and the outer lower magnetic conducting ring (128), and has a working air gap (3) on the inner side with the inner upper magnetic conducting ring (1210), the inner permanent magnet ring (1212) and the inner lower magnetic conducting ring (1211).

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