Magnetic bearing, compressor

Abstract

The application provides a magnetic suspension bearing and a compressor with the magnetic suspension bearing. The magnetic suspension bearing comprises a first axial core and a radial core. The first axial core has a first accommodating space. The first accommodating space is provided with an annular positioning boss. The annular positioning boss has an axial positioning surface and a radial positioning surface. A magnetic conducting ring is arranged in the first accommodating space. The magnetic conducting ring can be connected with the axial positioning surface and the radial positioning surface at the same time to realize the positioning of the magnetic conducting ring in the axial direction and the radial direction of the first axial core. The magnetic conducting ring is sleeved on the outer circumferential wall of the radial core. According to the application, the positioning of the radial core is more accurate, so that the problem that the positioning accuracy error of the radial core is large due to the connection with the magnetic steel in the prior art can be effectively avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bearing manufacturing, and particularly relates to a magnetic suspension bearing and a compressor. BACKGROUND

[0002] The magnetic suspension bearing has a series of excellent qualities such as non-contact, no wear, high rotation speed, high precision, no need for lubrication and sealing, and is a high-tech product integrating electromagnetism, electronics, control engineering, signal processing and mechanics.

[0003] The magnetic bearing is divided into three types of active type, passive type and hybrid type. The active type magnetic bearing has large rigidity and can be precisely controlled, but has large volume and power consumption for generating unit bearing force. The passive type magnetic bearing uses the attraction or repulsion between magnetic materials to suspend the rotor, and has low rigidity and damping. The hybrid type magnetic bearing uses a permanent magnet to provide a bias magnetic field to replace the static bias magnetic field generated by an electromagnet in the active type magnetic suspension bearing, reduces the ampere turns of the control winding, reduces the volume of the bearing, and improves the bearing carrying capacity. The hybrid type magnetic bearing has irreplaceable advantages in fields with strict requirements on volume and power consumption, and the magnetic bearing is mainly applied to high-speed and super-high-speed occasions. Therefore, the integration, miniaturization and improvement of the stability and reliability of the control system of the magnetic suspension system will be the key research direction.

[0004] The magnetic suspension bearing (taking a three-degree-of-freedom bearing as an example) in the prior art has a structure as shown in Figure 1 The permanent magnet 10 is directly sleeved outside the radial stator core 5. In order to reduce magnetic leakage, the gap between the radial stator core 5 outside and the permanent magnet 10 should be as small as possible. The radial stator core 5 is formed by stacking laminations, and it is difficult to ensure the gap between the permanent magnet 10 and the radial stator core 5 through actual part machining. Similarly, the assembly composed of the radial stator core 5, the permanent magnet 10 and the magnetic conducting ring 9 is an integral part, the permanent magnet 10 is located between the radial stator core 5 and the magnetic conducting ring 9, the shaft end face of the magnetic conducting ring 9 is also connected to the upper and lower cores (axial stator core 1), and the permanent magnet 10 cannot be machined. Therefore, it is difficult to ensure the precise positioning of the related parts in the magnetic suspension bearing. SUMMARY

[0005] Therefore, the application provides a magnetic suspension bearing and a compressor, which can overcome the defects in the related art that the permanent magnet in the magnetic suspension bearing is clamped between the magnetic conducting ring and the radial stator core, the positioning accuracy of the radial stator core is limited by the accuracy of the permanent magnet, and the permanent magnet cannot be machined, so that the positioning accuracy of the radial stator core is not high.

[0006] In order to solve the above problems, the application provides a magnetic suspension bearing, comprising a first axial core, a radial core, the first axial core has a first accommodating space, the first accommodating space has an annular positioning boss inside, the annular positioning boss has an axial positioning surface and a radial positioning surface, a magnetic conducting ring is arranged in the first accommodating space, the magnetic conducting ring can be connected with the axial positioning surface and the radial positioning surface at the same time to realize the positioning of the magnetic conducting ring in the axial direction and the radial direction of the first axial core, and the magnetic conducting ring is sleeved on the outer circumferential wall of the radial core.

[0007] In some embodiments, one end of the through hole of the magnetic conducting ring has a limiting ring table extending radially inward, and the limiting ring table can limit the axial direction of the radial core.

[0008] In some embodiments, the magnetic suspension bearing further comprises a plurality of magnetic steels, an annular gap is formed between the outer circumferential wall of the magnetic conducting ring and the wall of the first accommodating space, the plurality of magnetic steels are arranged in the annular gap in the circumferential direction, and the magnetic steels are gap-fitted with the annular gap.

[0009] In some embodiments, the magnetic suspension bearing further comprises two axial winding assemblies, and the two axial winding assemblies are respectively and correspondingly connected to the axial two end surfaces of the radial core.

[0010] In some embodiments, the axial winding assembly comprises a winding skeleton and an axial control winding, the axial control winding is arranged in the ring groove of the winding skeleton, the winding skeleton is provided with a plug-in structure towards the side of the radial core, and the winding skeletons connected to the axial two end surfaces of the radial core are connected into one body through the plug-in structure.

[0011] In some embodiments, the plug-in structure comprises a male seat and a female seat, and the same winding skeleton has the male seat and the female seat at the same time.

[0012] In some embodiments, the radial core is provided with a radial control winding, the first axial core is provided with a cable through hole, and the lead wires of the two axial control windings and 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.

[0013] In some embodiments, the magnetic suspension bearing further comprises a second axial core, the second axial core is detachably connected with the first axial core to be able to close the first accommodating space; and / or the annular positioning boss is a non-magnetic conducting positioning ring which is detachably connected in the first accommodating space.

[0014] In some embodiments, the magnetic bearing further comprises a rotating shaft assembly, the rotating shaft assembly comprises a thrust disc, the first axial core and / or the second axial core has a thrust disc through hole in which a protection bearing is embedded, and the protection bearing gap is sleeved on the outer circumferential side of the thrust disc.

[0015] In some embodiments, the outer circumferential side of the thrust disc is sleeved with an axial gap adjusting ring, the protection bearing gap is sleeved on the outer circumferential side of the axial gap adjusting ring, the outer circumferential side of the thrust disc is further sleeved with a rotor core assembly and a locking member arranged in a spaced manner, the axial gap adjusting ring is clamped between the locking member and the rotor core assembly, an axial limiting gap groove is formed on the outer circumferential wall of the axial gap adjusting ring, the inner ring of the protection bearing is sleeved in the axial limiting gap groove, and the axial length of the protection bearing is less than the axial length of the axial limiting gap groove to form an axial protection gap therebetween.

[0016] In some embodiments, the magnetic bearing further comprises a rotating shaft assembly, the rotating shaft assembly comprises a non-magnetic sleeve and a rotor core sleeved on the outer circumferential side thereof, axial both ends of the rotor core are provided with core shaft end baffles for axial positioning of the rotor core, the core shaft end baffles are magnetically conductive, and an axial adjusting gap is formed between the core shaft end baffles and the first axial core or the second axial core adjacent thereto; or, the rotating shaft assembly comprises a magnetically conductive sleeve and a rotor core sleeved on the outer circumferential side thereof, axial both ends of the rotor core are provided with core shaft end baffles for axial positioning of the rotor core, the core shaft end baffles are magnetically conductive, and an axial adjusting gap is formed between the core shaft end baffles and the first axial core or the second axial core adjacent thereto.

[0017] In some embodiments, when the rotating shaft assembly comprises a magnetically conductive sleeve, a magnetic isolation plate is further arranged between the core shaft end baffles and the corresponding end of the rotor core.

[0018] In some embodiments, the magnetic bearing further comprises a rotating shaft assembly, the rotating shaft assembly comprises a rotor core, the rotor core is sleeved on the outer circumferential side of a thrust disc, axial both ends of the rotor core are provided with core shaft end baffles for axial positioning of the rotor core, and the core shaft end baffles are magnetically conductive.

[0019] In some embodiments, at least one of the two core shaft end baffles has an extension sleeve extending in the axial direction towards the side of the rotor core, and the extension sleeve is sleeved between the central through hole of the rotor core and the outer circumferential wall of the thrust disc.

[0020] In some embodiments, the shaft assembly further includes a non-magnetic collar or a magnetic collar, and the rotor core and the non-magnetic collar or magnetic collar are positioned with respect to the thrust plate by positioning screws.

[0021] The present invention also provides a compressor comprising the aforementioned magnetic levitation bearing.

[0022] The present invention provides a magnetic levitation bearing and compressor in which the mounting reference of the radial iron core is jointly determined by the first axial iron core located on the outermost radial side, the annular positioning ring, the magnetic guide ring, and the central through hole wall of the magnetic guide ring. This positioning dimension chain does not involve the magnets (such as permanent magnets) in the prior art. The positioning and mating surfaces of each component in this dimension chain can be ensured by machining or other methods to ensure their dimensional accuracy, thereby making the positioning of the radial iron core more accurate. This effectively avoids the problem of large positioning accuracy errors of the radial iron core in the prior art due to its association with the magnets. Attached Figure Description

[0023] Figure 1 This is a schematic diagram (cross-sectional view) of the internal structure of a three-degree-of-freedom magnetic levitation bearing in the prior art. The arrows in the figure indicate the axial control magnetic circuit.

[0024] Figure 2 This is a schematic diagram (partial cross-sectional view) of the internal structure of a magnetic levitation bearing according to an embodiment of the present invention. The arrows in the figure indicate the axial control magnetic circuit.

[0025] Figure 3 for Figure 2 A magnified view of point I in the image;

[0026] Figure 4 for Figure 2 A schematic diagram of the magnetic levitation bearing from its axial perspective (from the side of the second axial core toward the side of the first axial core), with arrows indicating the radial control magnetic circuit;

[0027] Figure 5 for Figure 2 Exploded view of the structure of the magnetic levitation bearing in the diagram;

[0028] Figure 6 for Figure 5 A partial cross-sectional view of the magnetic levitation bearing in the image;

[0029] Figure 7 This is a schematic diagram (partial cross-sectional view) of the internal structure of a magnetic levitation bearing according to another embodiment of the present invention. The arrows in the figure indicate the axial control magnetic circuit.

[0030] Figures 8 to 14 These are schematic diagrams of the rotor assembly (including the axial core structure) in the magnetic levitation bearing in different embodiments.

[0031] Reference signs are indicated as:

[0032] 1, axial core; 2, axial winding skeleton; 3, axial winding; 4, radial winding; 5, radial core; 6, rotor core; 7, rotor collar; 8, core limiting baffle; 9, magnetic conducting ring; 10, permanent magnet; 11, axial control magnetic circuit; 12, permanent magnet bias magnetic circuit; 101, first axial core; 1011, cable through hole; 102, annular positioning boss; 103, magnetic conducting ring; 104, second axial core; 201, radial core; 202, radial control winding; 301, magnetic steel; 401, winding skeleton; 4011, male seat; 4012, female seat; 402, axial control winding; 501, non-magnetic conducting collar; 502, rotor core; 503, core shaft end baffle; 504, magnetic shielding plate; 505, magnetic conducting collar; 600, thrust disc; 601, protection bearing; 602, axial gap adjusting collar; 603, locking piece; 604, bearing gland. DETAILED DESCRIPTION

[0033] Reference should be made to Figures 2 to 14 As shown, according to the embodiment of the present application, a magnetic suspension bearing is provided, comprising a first axial core 101, a radial core 201, the first axial core 101 having a first accommodating space, the first accommodating space having an annular positioning boss 102 therein, the annular positioning boss 102 having an axial positioning face and a radial positioning face, a magnetic conducting ring 103 being arranged in the first accommodating space, the magnetic conducting ring 103 being capable of being connected with the axial positioning face and the radial positioning face to realize positioning of the magnetic conducting ring 103 in the axial direction and the radial direction of the first axial core 101, and the magnetic conducting ring 103 being sleeved on the outer circumferential wall of the radial core 201. In the technical solution, the installation reference of the radial core 201 is determined by the first axial core 101-annular positioning boss 102-magnetic conducting ring 103-central through hole wall of the magnetic conducting ring 103 which are located at the most outer side in the radial direction, and the positioning and matching faces of each component in this positioning dimension chain can be ensured to have shape and position accuracy by machining and other means, so that the positioning of the radial core 201 is more accurate, and the problem of large positioning error of the radial core 201 due to the association with the magnetic steel (such as permanent magnet) in the prior art is effectively avoided.

[0034] In some embodiments, one end of the central through hole of the magnetic conducting ring 103 has a limiting ring platform extending radially inward along it, which can limit the axial direction of the radial core 201. In this way, the radial direction of the radial core 201 is positioned by the central through hole of the magnetic conducting ring 103, and the axial direction of the radial core 201 is positioned by the central through hole of the magnetic conducting ring 103. It can be understood that the relative position between the magnetic conducting ring 103 and the radial core 201 can be finally locked by interference fit, adhesion, etc. The magnetic conducting ring 103 and the annular positioning boss 102 also have axial positioning surfaces and radial positioning surfaces, which can be reliably positioned and connected by interference fit or adhesion.

[0035] In some embodiments, the magnetic suspension bearing further comprises a plurality of magnetic steels 301 (for example, permanent magnets). The outer circumferential wall of the magnetic conducting ring 103 and the wall of the first accommodating space form an annular gap, and the plurality of magnetic steels 301 are arranged in the annular gap along the circumferential direction. The magnetic steels 301 and the annular gap are gap-fitted. Arranging the magnetic steels 301 in the annular gap makes the structure of the magnetic suspension bearing more compact. Gap-fitting between the magnetic steels 301 and the annular gap facilitates the installation of the magnetic steels 301, prevents the magnetic steels 301 from exerting force on the magnetic conducting ring 103, and reduces the position accuracy of the radial core 201. It can be understood that the machining difficulty of the magnetic steels 301 is reduced because the size accuracy of the magnetic steels 301 does not need to be considered too much. In one specific embodiment, the magnetic steels 301 can be square column-shaped magnetic steels. The outer circumferential wall of the corresponding magnetic conducting ring 103 and the inner wall of the first accommodating space are polygons, which form flat surfaces with the mating surfaces of the square column-shaped magnetic steels. In this way, the polygonal structure can be used to position the plurality of magnetic steels in the circumferential direction, and a separate magnetic steel fixing frame can not be needed, which further simplifies the structure of the magnetic suspension bearing.

[0036] In some embodiments, the magnetic suspension bearing further comprises two axial winding assemblies, each of which is connected to an axial end face of the radial core 201, and compared with the prior art in which the axial winding assembly is connected to the two axial end faces of the magnetic conducting ring, in the present application, the axial winding assembly is connected to the radial core 201, so that the distance between the axial winding assembly and the radial control winding 202 of the radial core 201 is closer, and the winding leads of the two can be collected together and then led out to the outside of the magnetic suspension bearing. For example, the first axial core 101 is provided with a cable through hole 1011, and the leads of the two axial control windings 402 and the radial control winding 202 are led out from the first containing space to the outside of the first containing space through the cable through hole 1011, so that the structure of the magnetic suspension bearing is further simplified.

[0037] In some embodiments, the axial winding assembly comprises a winding skeleton 401 and an axial control winding 402, the axial control winding is arranged in the ring groove of the winding skeleton 401, the winding skeleton 401 is provided with a plug-in structure towards the side of the radial core 201, and the winding skeletons 401 connected to the two axial end faces of the radial core 201 are connected as a whole through the plug-in structure, the plug-in structure comprises a male seat 4011 and a female seat 4012, and the same winding skeleton 401 has both the male seat 4011 and the female seat 4012, at this time, one of the two opposite axial winding assemblies can be reliably connected through the male seat 4011 and the female seat 4012 of the other (for example, the two can be fixedly connected through pasting, interference fit, etc.). It can be understood that the radial core 201 is also provided with a through hole for the plug-in structure to pass through.

[0038] The magnetic suspension bearing further comprises a second axial core 104, which is detachably connected with the first axial core 101 to be able to close the first containing space, that is, the first axial core 101 and the second axial core 104 objectively form the shell of the magnetic suspension bearing. It needs to be particularly emphasized that in the present application, the axial winding assembly, the radial core 201, the radial control winding 202, the magnetic conducting ring 103, the annular positioning boss 102 and the first axial core 101 in the magnetic suspension bearing are assembled as a whole to constitute the first part of the magnetic suspension bearing, the second axial core 104 constitutes the second part of the magnetic suspension bearing, and the shaft assembly serves as the third part, so that the integration and compactness of the magnetic suspension bearing of the present application are improved, greatly facilitating the assembly and disassembly process of the magnetic suspension bearing.

[0039] In some embodiments, the annular positioning boss 102 is a non-magnetic 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 material, and the annular positioning boss 102 is connected in the first accommodating space in a form of interference fit, that is, the annular positioning boss 102 and the first axial core 101 are connected in a form of interference fit.

[0040] In some embodiments, the magnetic suspension bearing further comprises a rotating shaft assembly, the rotating shaft assembly comprises a thrust disc 600, the first axial core 101 and / or the second axial core 104 is provided with a thrust disc through hole, and a protection bearing 601 is embedded in the thrust disc through hole, and the protection bearing 601 is gap-mounted on the outer circumferential side of the thrust disc 600. For details, see Figure 3 As shown, there is a radial air gap g1 between the radial core 201 and the rotor core 502, there is an axial air gap g2 between the second axial core 104 and the core shaft end baffle plate 503 adjacent to the second axial core 104, there is an axial air gap g3 (not shown in the figure) between the first axial core 101 and the core shaft end baffle plate 503 adjacent to the first axial core 101, there is an axial air gap g4 between the protection bearing 601 on the left side of the rotating shaft and the left end of the thrust disc 600, and there is an axial air gap g5 (not shown in the figure) between the protection bearing 601 on the right side of the rotating shaft and the right end of the thrust disc, it should be guaranteed that g2>g4 and g3>g5 so that the protection bearing 601 has a protection effect, and there is an air gap g6 between the protection bearing 601 and the thrust disc 600 in the radial direction, and g1>g6.

[0041] The control logic of the magnetic suspension bearing comprises axial bearing control logic and radial control logic, and the two control logics are basically the same. Taking the axial bearing control logic as an example: when the sensor detects that the axial air gap g2>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 core 104 are superposed, the front bearing output Ff(front bearing output)>Fr(back bearing output) (the front is left and the back is right as shown), and the rotating shaft assembly moves to the left. Similarly, when the sensor detects that the axial air gap g2 Figure 3 g3, the controller controls the current direction in the bearing to change, so that the rotating shaft assembly moves to the right.

[0042] In other embodiments, as Figure 7As shown, the outer circumferential side of the thrust disc 600 is sleeved with an axial gap adjusting sleeve 602, the protective bearing 601 is sleeved on the outer circumferential side of the axial gap adjusting sleeve 602, the outer circumferential side of the thrust disc 600 is also sleeved with a rotor core assembly and a locking member 603 arranged in a spaced manner, the axial gap adjusting sleeve 602 is clamped by the locking member 603 and the rotor core assembly, an axial limiting gap groove is formed on the outer circumferential wall of the axial gap adjusting sleeve 602, the inner ring of the protective bearing 601 is sleeved in the axial limiting gap groove, the axial length of the protective bearing 601 is less than the axial length of the axial limiting gap groove to form an axial protection gap therebetween, the axial protection gap of the protective bearing is adjusted by replacing the axial gap adjusting sleeve 602 with an axial limiting gap groove of different groove width (i.e. axial length). The locking member 603 can be a locking nut and a gasket between the locking nut and the inner ring of the protective bearing 601. It can be understood that the axial direction of the protective bearing 601 should also be limited, for example, when the protective bearing 601 is assembled on the first axial core 101, at this time, the bearing pressing cover 604 is arranged on the first axial core 101, which is detachably connected to the outer side of the first axial core 101.

[0043] In some embodiments, the magnetic suspension bearing further comprises a rotating shaft assembly, the rotating shaft assembly comprises a non-magnetic sleeve 501 and a rotor core 502 sleeved on the outer circumferential side of the non-magnetic sleeve 501, axial both ends of the rotor core 502 are provided with core shaft end baffles 503 for axial positioning of the rotor core 502, the core shaft end baffles 503 are magnetically 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 102 adjacent thereto; or, the rotating shaft assembly comprises a magnetically conductive sleeve 505 and a rotor core 502 sleeved on the outer circumferential side of the magnetically conductive sleeve 505, axial both ends of the rotor core 502 are provided with core shaft end baffles 503 for axial positioning of the rotor core 502, the core shaft end baffles 503 are magnetically 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 102 adjacent thereto, which has small magnetic resistance and higher utilization rate of magnetic flux. When the rotating shaft assembly comprises the magnetically conductive sleeve 505, a magnetic isolation plate 504 is further arranged between the core shaft end baffles 503 and the corresponding end of the rotor core 502 to ensure that the magnetic flux can pass through the magnetically conductive sleeve 505.

[0044] In another embodiment, the rotating shaft assembly includes a rotor core 502 sleeved on the outer circumferential side of the thrust disc 600, and the axial ends of the rotor core 502 are provided with core shaft end baffles 503 for axial positioning of the rotor core 502, 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 sleeve extending axially towards the side of the rotor core 502, and the extension sleeve is sleeved between the central through hole of the rotor core 502 and the outer circumferential wall of the thrust disc 600. In this technical solution, only the core shaft end baffles 503 are provided, and the aforementioned non-magnetic conductive sleeve 501 or the magnetic conductive sleeve 505 is not required, so that the structure of the rotating shaft assembly is simplified.

[0045] In some embodiments, the rotating shaft assembly further includes a non-magnetic conductive sleeve 501 or a magnetic conductive sleeve 504, and the rotor core 502 and the non-magnetic conductive sleeve 501 or the magnetic conductive sleeve 504 are positioned by positioning screws between the thrust disc 600, so that the sleeved components do not have to be assembled by interference fit, improving assembly efficiency and facilitating replacement.

[0046] The protective bearing 601 is a deep groove ball bearing or an angular contact ball bearing (used in pairs), which has radial protection and axial protection. The angular contact bearing is generally used in pairs, and is generally made of steel or ceramic ball bearing or hybrid ceramic ball bearing. The outer ring of the protective bearing 601 is radially assembled with interference with the first axial core 101 and the second axial core 104, so as to limit the movement of the protective bearing outer ring in the axial direction, or other limiting methods such as gluing and bearing clamping.

[0047] According to the embodiments of the present application, a compressor is also provided, which includes the magnetic suspension bearing described above.

[0048] It is easy for those skilled in the art to understand that the above advantageous modes can be freely combined and superimposed without conflict.

[0049] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only a preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications shall be regarded as the protection scope of the present application.

Claims

1. A magnetic levitation bearing, characterized in that, The device includes a first axial core (101) and a radial core (201). The first axial core (101) has a first accommodating space. The first accommodating space has an annular positioning boss (102). The annular positioning boss (102) has an axial positioning surface and a radial positioning surface. A magnetic ring (103) is provided in the first accommodating space. The magnetic ring (103) can simultaneously cooperate with the axial positioning surface and the radial positioning surface to achieve axial and radial positioning of the magnetic ring (103) in the first axial core (101). The magnetic ring (103) is fitted on the outer circumferential wall of the radial core (201). One end of the central through hole of the magnetic ring (103) has a limiting ring platform extending radially inward. The limiting ring platform can limit the axial direction of the radial core (201).

2. The magnetic levitation bearing according to claim 1, characterized in that, It also includes a plurality of magnets (301), and an annular gap is formed between the outer circumferential wall of the magnetic ring (103) and the wall of the first accommodating space. The plurality of magnets (301) are arranged circumferentially in the annular gap, and the magnets (301) and the annular gap are in clearance fit.

3. The magnetic levitation bearing according to claim 1, characterized in that, It also includes two axial winding assemblies, which are respectively connected to the two axial end faces of the radial core (201).

4. The magnetic levitation bearing according to claim 3, characterized in that, The axial winding assembly includes a winding bobbin (401) and an axial control winding (402). The axial control winding (402) is wound in an annular groove of the winding bobbin (401). The winding bobbin (401) is provided with a plug-in structure on the side facing the radial core (201). The winding bobbin (401) connected to the two axial end faces of the radial core (201) are connected as a whole through the plug-in structure.

5. The magnetic levitation bearing according to claim 4, characterized in that, The plug-in structure includes a male connector (4011) and a female connector (4012), and the same winding frame (401) has both the male connector (4011) and the female connector (4012).

6. The magnetic levitation bearing according to claim 4, characterized in that, The radial core (201) is wound with a radial control winding (202), and the first axial core (101) is provided with a cable through hole (1011). The lead 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).

7. The magnetic levitation bearing according to claim 1, characterized in that, It also includes a second axial core (104), which is detachably connected to the first axial core (101) to close the first accommodating space; and / or, the annular positioning boss (102) is a non-magnetic positioning ring detachably connected to the first accommodating space.

8. The magnetic levitation bearing according to claim 7, characterized in that, It also includes a shaft assembly, which includes a thrust disk (600), and a protective bearing (601) is embedded in the thrust disk through hole of the first axial core (101) and / or the second axial core (104), and the protective bearing (601) is spaced and fitted on the outer circumference of the thrust disk (600).

9. The magnetic levitation bearing according to claim 8, characterized in that, An axial clearance adjusting collar (602) is fitted on the outer circumference of the thrust disc (600). The protective bearing (601) is fitted with clearance on the outer circumference of the axial clearance adjusting collar (602). A rotor core assembly and a locking member (603) spaced apart are also fitted on the outer circumference of the thrust disc (600). The axial clearance adjusting collar (602) is held by the locking member (603) and the rotor core assembly. An axial limiting clearance groove is formed on the outer circumferential wall of the axial clearance adjusting collar (602). The inner ring of the protective bearing (601) is fitted in the axial limiting clearance groove. The axial length of the protective bearing (601) is less than the axial length of the axial limiting clearance groove to form an axial protective clearance between them.

10. The magnetic levitation bearing according to claim 7, characterized in that, It also includes a shaft assembly, which includes a non-magnetic collar (501) and a rotor core (502) fitted around its outer circumference. The rotor core (502) has core shaft end baffles (503) at both axial ends for axial positioning. The core shaft end baffles (503) are magnetically conductive, and axial adjustment is achieved between the core shaft end baffles (503) and the adjacent first axial core (101) or second axial core (104). The gap; or, the rotating shaft assembly includes a magnetic collar (505) and a rotor core (502) fitted on its outer circumference. The rotor core (502) is provided with core shaft end baffles (503) at both axial ends to position the rotor core (502) axially. The core shaft end baffles (503) are magnetic, and an axial adjustment gap is formed between the core shaft end baffles (503) and the adjacent first axial core (101) or second axial core (104).

11. The magnetic levitation bearing according to claim 10, characterized in that, When the rotating shaft assembly includes a magnetic guide ring (505), a magnetic shielding plate (504) is also provided between the iron core shaft end baffle (503) and the corresponding end of the rotor iron core (502).

12. The magnetic levitation bearing according to claim 1, characterized in that, It also includes a shaft assembly, which includes a rotor core (502), the rotor core (502) being fitted onto the outer circumference of the thrust disk (600), and the rotor core (502) having core shaft end baffles (503) at both axial ends for axial positioning of the rotor core (502), and the core shaft end baffles (503) being magnetically conductive.

13. The magnetic levitation bearing according to claim 12, characterized in that, At least one of the two core shaft end baffles (503) has an extension collar extending axially toward one side of the rotor core (502), the extension collar being fitted between the central through hole of the rotor core (502) and the outer circumferential wall of the thrust disk (600).

14. The magnetic levitation bearing according to claim 12, characterized in that, The rotating shaft assembly also includes a non-magnetic collar (501) or a magnetic collar (505), and the rotor core (502) and the non-magnetic collar (501) or magnetic collar (505) are positioned with the thrust plate (600) by positioning screws.

15. A compressor, characterized in that, Includes the magnetic levitation bearing according to any one of claims 1 to 14.

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