CN217481772U - Magnetic suspension bearing and compressor - Google Patents

Abstract

The utility model provides a magnetic suspension bearing, compressor, magnetic suspension bearing wherein, including first axial core, radial core, first axial core has first accommodation space, annular location boss has in the first accommodation space, annular location boss has axial positioning face and radial positioning face, be equipped with the magnetic conduction ring in the first accommodation space, the magnetic conduction ring can simultaneously with axial positioning face and radial positioning face cooperation are connected in order to realize right the magnetic conduction ring is in the axial and radial location of first axial core, the magnetic conduction ring suit in on the outer periphery wall of radial core. According to the utility model discloses, radial iron core's location is more accurate to effectively avoid the location of the radial iron core among the prior art because there is the association with the magnet steel, the great problem of positioning accuracy error of radial iron core appears.

Description

Magnetic suspension bearing and compressor

Technical Field

The utility model belongs to the technical field of the bearing is made, concretely relates to magnetic suspension bearing, compressor.

Background

The magnetic suspension bearing has a series of excellent qualities of no contact, no abrasion, high rotating speed, high precision, no need of lubrication and sealing and the like, and is a high and new technical product integrating electromagnetism, electronic technology, control engineering, signal processing and mechanics.

The magnetic bearing is divided into three types of active type, passive type and mixed type, the active type magnetic bearing has high rigidity and can be precisely controlled, but the volume and the power consumption required for generating unit bearing capacity are large; the passive magnetic bearing realizes the suspension of the rotor by utilizing the attraction force or the repulsion force between magnetic materials, and has lower rigidity and damping; the hybrid magnetic bearing uses a permanent magnet to provide a bias magnetic field to replace a static bias magnetic field generated by an electromagnet in an active magnetic suspension bearing, reduces the ampere-turns of a control winding, reduces the volume of the bearing, improves the bearing capacity of the bearing and the like; the hybrid magnetic bearing has irreplaceable advantages in the field with strict requirements on volume and power consumption, and is mainly applied to high-speed and ultra-high-speed occasions. Therefore, the integration and miniaturization of the magnetic levitation system and the improvement of the stability and reliability of the control system will be the key research directions.

In the magnetic suspension bearing (taking a three-degree-of-freedom bearing as an example) in the prior art, as shown in fig. 1, a permanent magnet 10 is directly sleeved on the outer side of a radial stator core 5, in order to reduce magnetic leakage, a fit gap between the outer side of the radial stator core 5 and the permanent magnet 10 should be as small as possible, the radial stator core 5 is formed by stacking and assembling laminated sheets, it is difficult to ensure the fit gap between the permanent magnet 10 and the radial stator core 5 in actual part processing, similarly, an assembly composed of the radial stator core 5, the permanent magnet 10 and a magnetic conduction ring 9 is an integral part, wherein the permanent magnet 10 is positioned between the radial stator core 5 and the magnetic conduction ring 9, the axial end surface of the magnetic conduction ring 9 is also connected with an upper iron core and a lower iron core (axial stator core 1), and the permanent magnet 10 cannot be machined, so that accurate positioning of each relevant component in the magnetic suspension bearing is difficult to ensure.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides a magnetic suspension bearing, compressor can overcome the magnetic suspension bearing in the correlation technique in the permanent magnet body centre gripping between magnetic conduction ring and radial stator core, radial stator core's positioning accuracy is subject to the precision of permanent magnet, thereby the unable machining of permanent magnet makes radial stator core's positioning accuracy not high not enough.

In order to solve the problem, the utility model provides a magnetic suspension bearing, including primary shaft iron core, radial iron core, primary shaft iron core has first accommodation space, annular positioning boss has in the first accommodation space, annular positioning boss has axial positioning face and radial positioning face, be equipped with the magnetic conduction ring in the first accommodation space, the magnetic conduction ring can simultaneously with axial positioning face and radial positioning face cooperation are connected in order to realize right the magnetic conduction ring is in primary shaft iron core's axial and radial location, the magnetic conduction ring suit in on radial iron core's the outer periphery wall.

In some embodiments, one end of the aperture of the central through hole of the magnetic conduction ring is provided with a limit ring platform extending inwards along the radial direction of the aperture, and the limit ring platform can limit the axial direction of the radial iron core.

In some embodiments, the magnetic suspension bearing further includes a plurality of magnetic steels, an annular gap is formed between the outer circumferential wall of the magnetic conductive ring and the wall body of the first accommodating space, the magnetic steels are arranged in the annular gap at intervals along the circumferential direction of the annular gap, and the magnetic steels are in clearance fit with the annular gap.

In some embodiments, the magnetic suspension bearing further includes two axial winding assemblies, and the two axial winding assemblies are respectively connected to two axial end faces of the radial iron core in a one-to-one correspondence manner.

In some embodiments, the axial winding subassembly includes bobbin and axial control winding, the axial control winding is around locating bobbin has the annular inslot, the bobbin orientation radial iron core one side is equipped with the grafting structure, connect respectively on two terminal surfaces of axial of radial iron core bobbin passes through the grafting structure connects as an organic wholely.

In some embodiments, the insertion structure includes a male seat and a female seat, and the male seat and the female seat are provided on the same bobbin.

In some embodiments, the radial iron core is wound with radial control windings, the first axial iron core is configured with a cable through hole, and the two axial control windings and the outgoing line of the radial control winding are led out from the first accommodating space to the outside of the first accommodating space through the cable through hole.

In some embodiments, the magnetic suspension bearing further comprises a second axial core detachably connected with the first axial core to be able to close the first accommodation space; and/or the annular positioning boss is a non-magnetic positioning ring detachably connected in the first accommodating space.

In some embodiments, the magnetic suspension bearing further comprises a rotating shaft assembly, the rotating shaft assembly comprises a thrust disc, a protective bearing is embedded in a thrust disc passing hole of the first axial iron core and/or the second axial iron core, and the protective bearing is in clearance fit with the outer circumferential side of the thrust disc.

In some embodiments, the outer circumference side of the thrust disc is sleeved with an axial clearance adjusting lantern ring, the protective bearing clearance is sleeved on the outer circumference side of the axial clearance adjusting lantern ring, the outer circumference side of the thrust disc is further sleeved with a rotor iron core assembly and a locking member arranged at an interval with the rotor iron core assembly, the axial clearance adjusting lantern ring is used for clamping the locking member with the rotor iron core assembly, an axial limiting clearance groove is formed in the outer circumferential wall of the axial clearance adjusting lantern ring, the inner ring of the protective bearing is sleeved in the axial limiting clearance groove, and the axial length of the protective bearing is smaller than that of the axial limiting clearance groove so as to form an axial protective clearance between the axial limiting clearance and the axial clearance.

In some embodiments, the magnetic suspension bearing further comprises a rotating shaft assembly, the rotating shaft assembly comprises a non-magnetic-conductive sleeve ring and a rotor core sleeved on the outer circumference side of the non-magnetic-conductive sleeve ring, two axial ends of the rotor core are provided with iron core shaft end baffles for axially positioning the rotor core, the iron core shaft end baffles are magnetic conductive, and an axial adjusting gap is formed between the iron core shaft end baffles and the first axial core or the second axial core adjacent to the iron core shaft end baffles; or, the rotating shaft assembly comprises a magnetic conduction lantern ring and a rotor core sleeved on the outer circumference side of the magnetic conduction lantern ring, iron core shaft end baffles are arranged at two axial ends of the rotor core to axially position the rotor core, the iron core shaft end baffles conduct magnetism, and an axial adjusting gap is formed between the iron core shaft end baffles and the first axial core or the second axial core adjacent to the iron core shaft end baffles.

In some embodiments, when the rotating shaft assembly includes a magnetic conductive collar, a magnetic isolation plate is further disposed between the iron core shaft end baffle and the corresponding end of the rotor iron core.

In some embodiments, the magnetic suspension bearing further includes a rotating shaft assembly, the rotating shaft assembly includes a rotor core, the rotor core is sleeved on the outer circumference side of the thrust disc, the two axial ends of the rotor core are provided with core shaft end baffles for axially positioning the rotor core, and the core shaft end baffles are magnetically conductive.

In some embodiments, at least one of the two core shaft end baffles has an extension collar extending axially along it toward one side of the rotor core, the extension collar being fitted between the central through hole of the rotor core and the outer circumferential wall of the thrust disc.

In some embodiments, the rotating shaft assembly further comprises a non-magnetic conductive collar or a magnetic conductive collar, and the rotor core and the non-magnetic conductive collar or the magnetic conductive collar are positioned with the thrust disc by a positioning screw.

The utility model also provides a compressor, including foretell magnetic suspension bearing.

The utility model provides a pair of magnetic suspension bearing, compressor, the installation benchmark of radial iron core is decided jointly by the central through-hole pore wall that is in the first axial iron core in radial outside-annular position ring platform-magnetic ring, do not relate to magnet steel (for example permanent magnet) among the prior art among this positioning dimension chain, the positioning fitting surface of each part in this size chain all can adopt modes such as machining to guarantee its form and position precision, thereby make the location of radial iron core more accurate, thereby effectively avoid the location of the radial iron core among the prior art because there is the relation with the magnet steel, the great problem of positioning accuracy error of radial iron core appears.

Drawings

Fig. 1 is a schematic diagram (cross-sectional view) of the internal structure of a three-degree-of-freedom magnetic suspension bearing in the prior art, in which arrows show axial control magnetic paths;

fig. 2 is a schematic diagram (partially sectional view) of the internal structure of a magnetic suspension bearing according to an embodiment of the present invention, in which arrows show an axial control magnetic circuit;

FIG. 3 is an enlarged view of a portion of FIG. 2 at I;

fig. 4 is a schematic view of the magnetic bearing of fig. 2 in its axial view (from the side of the second axial core towards the side of the first axial core), with the arrows showing the radial control magnetic circuits;

FIG. 5 is an exploded view of the magnetic bearing of FIG. 2;

FIG. 6 is a partial cross-sectional view of the magnetic bearing of FIG. 5;

FIG. 7 is a schematic view (partially sectional view) of the internal structure of a magnetic suspension bearing according to another embodiment of the present invention, in which arrows show an axial control magnetic circuit

Fig. 8 to 14 are schematic structural diagrams (including axial core portion structures) of rotor assemblies in magnetic bearings in different embodiments, respectively.

The reference numbers are given as:

1. an axial core; 2. an axial winding skeleton; 3. an axial winding; 4. a radial winding; 5. a radial iron core; 6. a rotor core; 7. a rotor collar; 8. an iron core limiting baffle; 9. a magnetic conductive ring; 10. a permanent magnet; 11. an axial control magnetic circuit; 12. a permanent magnet bias magnetic circuit; 101. a first axial core; 1011. a cable through hole; 102. an annular positioning boss; 103. a magnetic conductive ring; 104. a second axial core; 201. a radial iron core; 202. a radial control winding; 301. magnetic steel; 401. winding a bobbin; 4011. a male seat; 4012. a female seat; 402. an axial control winding; 501. a non-magnetically conductive collar; 502. a rotor core; 503. an iron core shaft end baffle; 504. a magnetic isolation plate; 505. a magnetic conductive lantern ring; 600. a thrust disc; 601. protecting the bearing; 602. an axial clearance adjustment collar; 603. a locking member; 604. and bearing pressing covers.

Detailed Description

Referring to fig. 2 to 14 in combination, according to the embodiment of the utility model, a magnetic suspension bearing is provided, including first axial core 101, radial core 201, first axial core 101 has first accommodation space, annular location boss 102 has in the first accommodation space, annular location boss 102 has axial positioning surface and radial positioning surface, be equipped with magnetic ring 103 in the first accommodation space, magnetic ring 103 can simultaneously with axial positioning surface and radial positioning surface cooperation are connected in order to realize right magnetic ring 103 is in the axial of first axial core 101 and radial location, magnetic ring 103 suit in on radial core 201's the outer circumferential wall. The installation reference of the radial iron core 201 in the technical scheme is determined by the central through hole wall of the first axial iron core 101, the annular positioning boss 102, the magnetic conductive ring 103 and the magnetic conductive ring 103 which are positioned on the outermost side in the radial direction, the positioning size chain does not relate to magnetic steel (such as a permanent magnet) in the prior art, and the positioning matching surfaces of all components in the size chain can ensure the form and position precision by adopting the modes of machining and the like, so that the positioning of the radial iron core 201 is more accurate, and the problem that the positioning precision error of the radial iron core 201 is larger due to the fact that the positioning of the radial iron core 201 in the prior art is related to the magnetic steel is effectively avoided.

In some embodiments, an end opening of the central through hole of the magnetic conductive ring 103 has a limit ring table extending radially inward along the end opening, and the limit ring table can limit the axial direction of the radial iron core 201, so that the radial direction of the radial iron core 201 is located by the central through hole of the magnetic conductive ring 103, and the axial direction of the radial iron core 201 is located by the central through hole of the magnetic conductive ring 103, and it can be understood that the magnetic conductive ring 103 and the radial iron core 201 can be finally locked in relative positions by interference fit, adhesion, and the like. The axial positioning surface and the radial positioning surface of the magnetic conduction ring 103 and the annular positioning boss 102 can be in interference fit or adhered to realize reliable positioning connection.

In some embodiments, the magnetic suspension bearing further includes a plurality of magnetic steels 301 (such as permanent magnets specifically), an annular gap is formed between the outer circumferential wall of the magnetic conductive ring 103 and the wall body of the first accommodating space, the plurality of magnetic steels 301 are arranged in the annular gap at intervals in the circumferential direction of the annular gap, and the magnetic steels 301 are in clearance fit with the annular gap, so that the magnetic suspension bearing is more compact in structure by arranging the magnetic steels 301 in the annular gap, and meanwhile, the magnetic steels 301 and the annular gap are in clearance fit, so that the magnetic steels 301 are convenient to mount, and meanwhile, the magnetic steels 301 can be prevented from being applied with force on the magnetic conductive ring 103 and further forming disadvantages on the magnetic conductive ring 103, so that the position precision of the radial iron core 201 is reduced, and it can be understood that the magnetic steels 301 at this time need not consider too much the too high size precision thereof, and the processing difficulty is reduced. In a specific embodiment, the magnetic steel 301 may be a magnetic steel in a square cylinder shape, and at this time, the outer circumferential wall of the corresponding magnetic conductive ring 103 and the inner wall of the first accommodating space are polygonal, so as to form a plane with a matching surface between the magnetic steel in the square cylinder shape, thereby achieving circumferential positioning of the plurality of magnetic steels by using the polygonal structure, and further simplifying the structure of the magnetic suspension bearing without separately providing a corresponding magnetic steel fixing frame.

In some embodiments, the magnetic suspension bearing further includes two axial winding assemblies, the two axial winding assemblies are respectively connected to two axial end faces of the radial iron core 201 in a one-to-one correspondence manner, compared with the prior art that the axial winding assembly is connected with the two axial end faces of the magnetic conductive ring, the axial winding assembly is connected to the radial iron core 201 in the utility model, so that the radial iron core 201 is closer to the radial control winding 202 of the radial iron core 201, the winding leading-out wires of the axial winding assembly and the radial control winding 202 can be gathered together, and further leading out to the outside of the magnetic suspension bearing, specifically, for example, a cable through hole 1011 is formed in the first axial core 101, and the leading-out wires of the two axial control windings 402 and the radial control winding 202 are led out from the first accommodating space to the outside of the first accommodating space through the cable through hole 1011, so that the structure of the magnetic suspension bearing is further simplified.

In some embodiments, axial winding subassembly includes bobbin 401 and axial control winding 402, axial control winding is around locating bobbin 401 has the annular inslot, bobbin 401 orientation radial iron core 201 one side is equipped with the grafting structure, connect respectively on two terminal surfaces of radial iron core 201 axial bobbin 401 passes through grafting structure connects as an organic wholely, the grafting structure includes public seat 4011 and female seat 4012, and is same have simultaneously on bobbin 401 public seat 4011 and female seat 4012, relative two this moment one in the axial winding subassembly can form reliable connection through public seat 4011 that it has and another female seat 4012 that has (for example can realize fixed connection through modes such as pasting, interference fit between the two). It can be understood that the radial core 201 is also provided with a through hole for the insertion structure to pass through.

The magnetic suspension bearing further comprises a second axial iron core 104, wherein the second axial iron core 104 is detachably connected with the first axial iron core 101 so as to be capable of closing the first accommodating space, namely, the first axial iron core 101 and the second axial iron core 104 both objectively form a housing of the magnetic suspension bearing. It needs to be particularly emphasized, the utility model discloses in, axial winding subassembly, radial iron core 201, radial control winding 202, magnetic ring 103, annular location boss 102 and the equipment of first axial iron core 101 in the magnetic suspension bearing are a whole first part, second axial iron core 104 that constitute the magnetic suspension bearing and constitute the second part of magnetic suspension bearing, and the pivot subassembly then regards as the third part, so the utility model discloses a magnetic suspension bearing's integrated level, compact structure degree obtain improving, very big convenient magnetic suspension bearing's equipment dismantlement process.

In some embodiments, the annular positioning boss 102 is a non-magnetic-conductive positioning ring detachably connected in the first accommodating space, and it can be understood that the material of the first axial core 101 is a magnetic-conductive material, and the annular positioning boss 102 may specifically be connected in the first accommodating space in an interference fit manner, that is, the annular positioning boss 102 and the first axial core 101 are in an interference fit.

In some embodiments, the magnetic suspension bearing further includes a rotating shaft assembly, the rotating shaft assembly includes a thrust disc 600, a protective bearing 601 is embedded in a thrust disc passing hole of the first axial core 101 and/or the second axial core 104, and the protective bearing 601 is gap-fitted to an outer circumferential side of the thrust disc 600. Specifically, as shown in fig. 3, a radial air gap g1 is formed between the radial iron core 201 and the rotor iron core 502, an axial air gap g2 is formed between the second axial iron core 104 and the iron core shaft end baffle 503 adjacent to the second axial iron core 104, an axial air gap g3 (not shown in the figure) is formed between the first axial iron core 101 and the iron core shaft end baffle 503 adjacent to the first axial iron core, an axial air gap g4 is formed between the protection bearing 601 on the left side of the rotating shaft and the left end of the thrust disc 600, and an axial air gap g5 (not shown in the figure) is formed between the protection bearing 601 on the right side of the rotating shaft and the right end of the thrust disc, it should be ensured that g2 > g4, g3 > g5 so that the protection bearing 601 has a protection effect, an air gap g6 is formed between the protection bearing 601 and the thrust disc 600 in the radial direction, and g1 > g 6.

The control logic of the magnetic suspension bearing comprises an axial bearing control logic and a radial control logic, wherein the two control logics are approximately the same, and the axial bearing control logic is taken as an example: when the sensor detects that the axial air gap g2 is greater than g3, the controller controls the current direction in the bearing, so that the electromagnetic magnetic circuit and the permanent magnetic circuit in the second axial iron core 104 are overlapped, the bearing front side bearing output Ff (front bearing output) > Fr (rear bearing output) (the left side of the position shown in fig. 3 is the front side and the right side is the rear side), and the rotating shaft assembly moves leftwards.

In other embodiments, as shown in fig. 7, an axial gap adjustment collar 602 is fitted around the outer circumferential side of the thrust disk 600, the protective bearing 601 is gap-fitted to the outer circumferential side of the axial gap adjustment collar 602, the outer circumference of the thrust disc 600 is also sleeved with a rotor core assembly and a locking piece 603 arranged at an interval with the rotor core assembly, the axial clearance adjustment collar 602 is clamped between the locking member 603 and the rotor core assembly, an axial limit clearance groove is formed on the outer peripheral wall of the axial clearance adjusting sleeve ring 602, the inner ring of the protection bearing 601 is sleeved in the axial limit clearance groove, the axial length of the protection bearing 601 is smaller than the axial length of the axial limit clearance groove to form an axial protection gap therebetween, the axial protective gap of the protective bearing is adjusted by replacing the axial gap adjustment collar 602 with an axial limit gap slot of a different slot width (i.e., axial length). The locking element 603 may be, for example, a locking nut and a washer between the locking nut and the inner ring of the protective bearing 601. It can be understood that the axial direction of the protection bearing 601 should also be limited, for example, when the protection bearing 601 is assembled on the first axial core 101, the first axial core 101 is further provided with a bearing cover 604, which is detachably connected to the outer side of the first axial core 101.

In some embodiments, the magnetic suspension bearing further comprises a rotating shaft assembly, the rotating shaft assembly comprises a non-magnetic conductive collar 501 and a rotor core 502 sleeved on the outer circumference side of the non-magnetic conductive collar, two axial ends of the rotor core 502 are provided with core shaft end baffles 503 to position the rotor core 502 axially, the core shaft end baffles 503 are magnetic conductive, and an axial adjusting gap is formed between the core shaft end baffles 503 and the first axial core 101 or the second axial core 104 adjacent to the core shaft end baffles 503; or, the rotating shaft assembly includes a magnetic conductive lantern ring 505 and a rotor core 502 sleeved on the outer circumference side of the magnetic conductive lantern ring, the two axial ends of the rotor core 502 are provided with core shaft end baffles 503 for axially positioning the rotor core 502, the core shaft end baffles 503 are magnetic conductive, and an axial adjustment gap is formed between the core shaft end baffles 503 and the first axial core 101 or the second axial core 104 adjacent to the core shaft end baffles 503. When the rotating shaft assembly comprises a magnetic conductive sleeve ring 505, a magnetic isolation plate 504 is further arranged between the iron core shaft end baffle 503 and the corresponding end of the rotor iron core 502 to ensure that magnetic flux can pass through the magnetic conductive sleeve ring 505.

In a further embodiment, the rotating shaft assembly includes a rotor core 502, the rotor core 502 is sleeved on the outer circumferential side of the thrust plate 600, two axial ends of the rotor core 502 are provided with core shaft end baffles 503 for positioning the rotor core 502 in the axial direction, and the core shaft end baffles 503 are magnetically conductive. In some embodiments, at least one of the two core shaft end baffles 503 has an extension collar extending axially along the rotor core 502 toward one side thereof, and the extension collar is fitted between the central through hole of the rotor core 502 and the outer circumferential wall of the thrust disk 600. In the technical scheme, only the iron core shaft end baffle 503 is arranged, and the non-magnetic conductive lantern ring 501 or the magnetic conductive lantern ring 505 are not required to be arranged, so that the structure of the rotating shaft assembly is simplified.

In some embodiments, the rotating shaft assembly further includes a non-magnetic conductive collar 501 or a magnetic conductive collar 505, and the rotor core 502 and the non-magnetic conductive collar 501 or the magnetic conductive collar 505 are positioned with the thrust disc 600 by a positioning screw, so that interference fit between the sleeved components is not required, the assembly efficiency is improved, and replacement is facilitated.

The protective bearings 601 are deep groove ball bearings or angular contact ball bearings (used in pairs), and have radial protection and axial protection functions, wherein the angular contact bearings are generally used in pairs, and generally steel bearings, ceramic ball bearings or mixed ceramic ball bearings are adopted. The outer ring of the protection bearing 601 is in interference fit with the first axial iron core 101 and the second axial iron core 104 in the radial direction, so that the outer ring of the protection bearing is limited to move in the axial direction, or other limiting modes such as gluing and hooping by a bearing hoop are adopted.

According to the embodiment of the utility model, still provide a compressor, including foretell magnetic suspension bearing.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (16)

1. The utility model provides a magnetic suspension bearing, its characterized in that, includes first axial core (101), radial core (201), first axial core (101) has first accommodation space, annular location boss (102) have in the first accommodation space, annular location boss (102) have axial positioning face and radial positioning face, be equipped with magnetic ring (103) in the first accommodation space, magnetic ring (103) can simultaneously with axial positioning face and radial positioning face cooperate to be connected in order to realize right magnetic ring (103) are in the axial and radial location of first axial core (101), magnetic ring (103) suit in on the outer circumferential wall of radial core (201).

2. The magnetic suspension bearing according to claim 1, characterized in that one end opening of the central through hole of the magnetic conductive ring (103) is provided with a limit ring platform extending radially inwards along the central through hole, and the limit ring platform can limit the axial direction of the radial iron core (201).

3. The magnetic suspension bearing according to claim 1, further comprising a plurality of magnetic steels (301), wherein an annular gap is formed between the outer circumferential wall of the magnetic conductive ring (103) and the wall of the first accommodating space, the plurality of magnetic steels (301) are disposed in the annular gap at intervals along the circumferential direction of the annular gap, and the magnetic steels (301) are in clearance fit with the annular gap.

4. The magnetic suspension bearing according to claim 1, further comprising two axial winding assemblies, wherein the two axial winding assemblies are respectively connected to two axial end faces of the radial iron core (201) in a one-to-one correspondence manner.

5. The magnetic suspension bearing according to claim 4, wherein the axial winding assembly comprises a bobbin (401) and an axial control winding (402), the axial control winding is wound in a ring groove of the bobbin (401), a plug-in structure is arranged on one side of the bobbin (401) facing the radial iron core (201), and the bobbins (401) respectively connected to two axial end faces of the radial iron core (201) are connected into a whole through the plug-in structure.

6. Magnetic suspension bearing according to claim 5, characterized in that the plug-in structure comprises a male seat (4011) and a female seat (4012), both seats (4011, 4012) being present on the same winding frame (401).

7. Magnetic bearing according to claim 5, characterized in that radial control windings (202) are wound on the radial core (201), a cable through hole (1011) is formed on the first axial core (101), and the two axial control windings (402) and the outgoing lines of the radial control windings (202) are led out from the first accommodation space to the outside of the first accommodation space through the cable through hole (1011).

8. Magnetic bearing according to claim 1, characterized in that it further comprises a second axial core (104), said second axial core (104) being detachably connected to said first axial core (101) to be able to close said first housing space; and/or the annular positioning boss (102) is a non-magnetic-conductive positioning ring detachably connected in the first accommodating space.

9. The magnetic suspension bearing according to claim 8, further comprising a rotating shaft assembly, wherein the rotating shaft assembly comprises a thrust disc (600), a protective bearing (601) is embedded in a thrust disc passing hole of the first axial iron core (101) and/or the second axial iron core (104), and the protective bearing (601) is in clearance fit with the outer circumferential side of the thrust disc (600).

10. Magnetic bearing according to claim 9, characterized in that the outer circumferential side of the thrust disk (600) is fitted with an axial play adjustment collar (602), the protective bearing (601) is sleeved on the outer circumferential side of the axial clearance adjusting lantern ring (602) in a clearance manner, the outer circumference side of the thrust disc (600) is also sleeved with a rotor iron core component and a locking piece (603) arranged at an interval with the rotor iron core component, the axial clearance adjustment collar (602) is clamped by the locking member (603) and the rotor core assembly, an axial spacing clearance groove is formed on the outer peripheral wall of the axial clearance adjusting lantern ring (602), the inner ring of the protection bearing (601) is sleeved in the axial limiting clearance groove, and the axial length of the protection bearing (601) is smaller than that of the axial limiting clearance groove so as to form an axial protection gap between the axial limiting clearance groove and the axial limiting clearance groove.

11. The magnetic suspension bearing according to claim 1, further comprising a rotating shaft assembly, wherein the rotating shaft assembly comprises a non-magnetic conductive collar (501) and a rotor core (502) sleeved on the outer circumference side of the non-magnetic conductive collar, the rotor core (502) is provided with core shaft end baffles (503) at two axial ends for positioning the rotor core (502) in the axial direction, the core shaft end baffles (503) are magnetic conductive, and an axial adjusting gap is formed between the core shaft end baffles (503) and the first axial core (101) or the second axial core (104) adjacent to the core shaft end baffles; or the rotating shaft assembly comprises a magnetic conductive lantern ring (505) and a rotor core (502) sleeved on the outer circumference side of the magnetic conductive lantern ring, core shaft end baffles (503) are arranged at two axial ends of the rotor core (502) to axially position the rotor core (502), the core shaft end baffles (503) conduct magnetism, and an axial adjusting gap is formed between each core shaft end baffle (503) and the first axial core (101) or the second axial core (104) adjacent to the core shaft end baffle.

12. The magnetic suspension bearing of claim 11, wherein when the rotating shaft assembly comprises a magnetically conductive collar (505), a magnetic shield plate (504) is further disposed between the core shaft end baffle (503) and the corresponding end of the rotor core (502).

13. The magnetic suspension bearing according to claim 1, further comprising a rotating shaft assembly, wherein the rotating shaft assembly comprises a rotor core (502), the rotor core (502) is sleeved on the outer circumference side of the thrust disc (600), two axial ends of the rotor core (502) are provided with core shaft end baffles (503) for axially positioning the rotor core (502), and the core shaft end baffles (503) are magnetically conductive.

14. Magnetic bearing according to claim 13, characterized in that at least one of the two core shaft end baffles (503) has an extension collar extending axially along the rotor core (502) towards one side thereof, said extension collar being fitted between the central through hole of the rotor core (502) and the outer circumferential wall of the thrust disc (600).

15. The magnetic suspension bearing according to claim 13, wherein the rotating shaft assembly further comprises a non-magnetic conductive collar (501) or a magnetic conductive collar (505), and the rotor core (502) and the non-magnetic conductive collar (501) or the magnetic conductive collar (505) are positioned with the thrust disc (600) by a positioning screw.

16. A compressor, characterized by comprising a magnetic bearing according to any of claims 1 to 15.

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