Magnetic bearings, compressors

Abstract

The present invention provides a magnetic levitation bearing and a compressor, wherein the magnetic levitation bearing includes an axial control assembly and a radial control assembly, wherein the axial control assembly includes an axial iron core and an axial winding assembly disposed within the axial iron core, and the axial winding assembly is mounted on the outer circumference of the radial control assembly. According to the present invention, the space occupied by the shaft length is reduced, so that the shaft length can be designed to be shorter. Thus, the corresponding maximum rotational speed of the shaft can be designed to be higher, which can facilitate winding and further ensure the winding slot fill rate. Thus, under the premise of maintaining the same bearing performance, the winding structure itself is more compact and smaller in size. At the same time, the axial control winding located on the outside can also more conveniently lead out the winding lead.

Description

Technical Field

[0001] The present invention belongs to the technical field of bearing manufacturing, and in particular relates to a magnetic suspension bearing and a compressor. Background Art

[0002] Magnetic bearings have a series of excellent qualities such as non-contact, wear-free, high speed, high precision, and no need for lubrication and sealing. They are high-tech products that integrate electromagnetism, electronic technology, control engineering, signal processing, and mechanics.

[0003] Magnetic bearings are categorized into three types: active, passive, and hybrid. Active magnetic bearings offer high stiffness and can be precisely controlled, but they require a large volume and consume a large amount of power to generate a specific unit of load capacity. Passive magnetic bearings utilize the attractive or repulsive forces between magnetic materials to levitate the rotor, resulting in relatively low stiffness and damping. Hybrid magnetic bearings use permanent magnets to provide a bias magnetic field, replacing the static bias magnetic field generated by electromagnets in active magnetic bearings. This reduces the ampere-turns of the control winding, shrinks the bearing size, and improves the bearing's load capacity. Hybrid magnetic bearings offer irreplaceable advantages in applications with strict requirements on volume and power consumption, and are primarily used in high- and ultra-high-speed applications. Therefore, key research areas will be the integration and miniaturization of magnetic levitation systems and improving the stability and reliability of control systems.

[0004] The structure of the magnetic suspension bearing in the prior art (taking the three-degree-of-freedom bearing as an example) is as follows: Figure 1 and Figure 2 As shown, permanent magnet 1 generates a radial-axial bias magnetic field 4, forming bias magnetic flux in the axial and radial air gaps between axial core 6, radial core 3, and bearing rotor 10. A control current is fed into axial control winding 7 to generate axial control magnetic field 5, which adjusts the bias magnetic field in the axial air gap to achieve axial suspension control of the rotating shaft. A control current is fed into radial control winding 8 to generate radial control magnetic field 9, which adjusts the bias in the radial air gap to achieve radial suspension control of the rotating shaft, thereby achieving three-degree-of-freedom suspension of the rotating shaft. However, this approach presents the following problems: ① Both the axial control winding and the radial control winding are assembled on the radial core, making winding installation difficult; ② The radial and axial windings are arranged in a concentrated manner, resulting in an excessively large winding coil, which increases the axial space of the three-degree-of-freedom bearing, lengthens the rotating shaft, and reduces the maximum speed; ③ The axial coil is difficult to extract from the inside. Summary of the Invention

[0005] Therefore, the present invention provides a magnetic levitation bearing and compressor, which can overcome the shortcomings of the related art that the axial winding and the radial winding are both assembled on the radial iron core, resulting in difficulty in winding installation, the concentrated arrangement of the windings resulting in excessively large winding coils, and the bearings occupying too much space on the shaft length.

[0006] In order to solve the above problems, the present invention provides a magnetic levitation bearing, including an axial control component and a radial control component, wherein the axial control component includes an axial iron core and an axial winding component within the axial iron core, and the axial winding component is mounted on the outer circumferential side of the radial control component.

[0007] In some embodiments, the magnetic levitation bearing also includes a positioning ring, the axial core includes a first core shell and a second core shell that are assembled relative to each other, the inner side of the first core shell has a first positioning ring platform, the positioning ring is cooperatively connected to one axial side of the first positioning ring platform, and the axial winding assembly is connected to the side of the positioning ring away from the first positioning ring platform, the first core shell and the second core shell form an axial clamping for the axial winding assembly and the positioning ring.

[0008] In some embodiments, the axial winding assembly includes a skeleton support ring and an axial control winding wound in a ring groove of the skeleton support ring, and the axial winding assembly is detachably connected to the positioning ring through the skeleton support ring.

[0009] In some embodiments, the positioning ring has a wire outlet hole connected along its axial direction, and the lead wire of the axial control winding passes through the wire outlet hole.

[0010] In some embodiments, a wire skeleton is inserted into the wire outlet hole, and the lead wire of the axial control winding passes through the central through hole of the wire skeleton.

[0011] In some embodiments, the radial control assembly includes a magnetic ring, a radial iron core, and a radial control winding wound on the stator teeth of the radial iron core. The magnetic ring is mounted on the outer circumferential wall of the radial iron core. A second positioning ring platform is provided on the center hole wall of the positioning ring. The magnetic ring is cooperatively connected to one axial side of the second positioning ring platform.

[0012] In some embodiments, the magnetic bearing further includes a magnetic steel assembly, and the magnetic steel assembly includes two groups, and the two groups of magnetic steel assemblies are respectively connected to the two axial end faces of the magnetic conductive ring.

[0013] In some embodiments, the magnetic steel assembly includes multiple magnetic steels and a magnetic steel positioning ring. The magnetic steel positioning ring has multiple positioning grooves arranged at intervals along its circumference, and the multiple magnetic steels are respectively located in the multiple positioning grooves in a one-to-one correspondence.

[0014] In some embodiments, the magnetic steel is adhered to the axial end surface of the magnetic conductive ring; and / or the magnetic steel positioning ring is detachably connected to the axial end surface of the magnetic conductive ring.

[0015] In some embodiments, the magnetic levitation bearing further includes a rotor assembly, which includes a non-magnetic collar and a rotor core mounted on its outer circumferential side, and core axial end baffles are provided at both axial ends of the rotor core to axially position the rotor core, the core axial end baffles are magnetic, and an axial adjustment gap is formed between the core axial end baffles and the first core shell or the second core shell adjacent thereto; or, the rotor assembly includes a magnetic collar and a rotor core mounted on its outer circumferential side, and core axial end baffles are provided at both axial ends of the rotor core to axially position the rotor core, the core axial end baffles are magnetic, and an axial adjustment gap is formed between the core axial end baffles and the first core shell or the second core shell adjacent thereto.

[0016] In some embodiments, when the rotor assembly includes a magnetic conductive collar, a magnetic isolation plate is further provided between the core shaft end baffle and the corresponding end portion of the rotor core.

[0017] In some embodiments, the magnetic bearing further includes a rotor assembly, which includes a rotor core, which is mounted on the outer circumferential side of the thrust plate, and core axial end baffles are provided at both axial ends of the rotor core to axially position the rotor core, and the core axial end baffles are magnetically conductive.

[0018] In some embodiments, at least one of the two core shaft end baffles has an extension ring extending axially toward one side of the rotor core, and the extension ring is sleeved between the central through hole of the rotor core and the outer circumferential wall of the thrust plate.

[0019] In some embodiments, the rotor assembly further includes a non-magnetic collar or a magnetic collar, and the rotor core and the non-magnetic collar or the magnetic collar are positioned with the thrust plate by positioning screws.

[0020] The present invention also provides a compressor comprising the above-mentioned magnetic suspension bearing.

[0021] The present invention provides a magnetic levitation bearing and compressor. Compared with the centralized arrangement of axial control windings and radial control windings in the prior art, the axial winding assembly in this technical solution is located radially outside the radial control assembly. This can reduce the overall axial size of the magnetic levitation bearing, thereby reducing the space occupied by the shaft length, so that the shaft length can be designed to be shorter, and the corresponding maximum speed of the shaft can be designed to be higher. On the other hand, since the axial control winding and the radial control winding are arranged from inside to outside in the radial direction of the bearing, the winding space of the two windings tends to be reasonable, which can facilitate winding and thus ensure the winding slot fill rate. In this way, under the premise of the same bearing performance, the structure of the winding itself is more compact and smaller in size. At the same time, the axial control winding on the outside can also more conveniently lead out the winding lead. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram (cross-sectional view) of the internal structure of a three-degree-of-freedom magnetic bearing in the prior art, in which the arrows indicate the direction of the axial control magnetic field;

[0023] Figure 2 for Figure 1 Schematic diagram of the flow direction of the radial control magnetic field of the magnetic bearing;

[0024] Figure 3 This is a schematic diagram (cross-sectional view) of the back structure of a magnetic bearing according to an embodiment of the present invention, in which the arrows indicate the direction of the axial control magnetic field;

[0025] Figure 4 for Figure 2 Schematic diagram of the decomposition structure in;

[0026] Figure 5 for Figure 4 Partial cross-sectional view after assembly;

[0027] Figures 6 to 12 They are schematic structural diagrams of the rotor assembly (including the axial iron core structure) in the magnetic bearing in different embodiments.

[0028] The reference numerals indicate:

[0029] 1. Conductor skeleton; 2. Magnetic ring; 3. Radial core; 4. Radial-axial bias magnetic field; 5. Axial control magnetic field; 6. Axial core; 7. Axial control winding; 8. Radial control winding; 9. Radial control magnetic field; 10. Bearing rotor; 100. Axial control assembly; 101. Axial core; 1011. First core shell; 1012. Second core shell; 102. Axial winding assembly; 1021. Skeleton support ring; 1022 , axial control winding; 200, radial control assembly; 201, radial core; 202, radial control winding; 203, magnetic ring; 300, positioning ring; 301, conductor skeleton; 400, magnetic steel assembly; 401, magnetic steel; 402, magnetic steel positioning ring; 500, rotor assembly; 501, non-magnetic sleeve; 502, rotor core; 503, core shaft end baffle; 504, magnetic isolation plate; 505, magnetic sleeve; 600, thrust plate. DETAILED DESCRIPTION

[0030] See also Figures 2 to 12 As shown, according to an embodiment of the present invention, a magnetic levitation bearing is provided, including an axial control component 100 and a radial control component 200, wherein the axial control component 100 includes an axial iron core 101 and an axial winding component 102 within the axial iron core 101, and the axial winding component 102 is mounted on the outer circumferential side of the radial control component 200. Compared with the centralized arrangement of axial control windings and radial control windings in the prior art, the axial winding assembly 102 in this technical solution is located radially outside the radial control assembly 200. This can, on the one hand, reduce the overall axial size of the magnetic bearing, thereby reducing the space occupied by the shaft length, so that the shaft length can be designed to be shorter, and the corresponding maximum speed of the shaft can be designed to be higher. On the other hand, since the axial control winding and the radial control winding are arranged from inside to outside in the radial direction of the bearing, the winding space of the two windings tends to be reasonable, which facilitates winding and ensures the slot fill rate of the winding. In this way, under the premise of the same bearing performance, the structure of the winding itself is more compact and smaller in size. At the same time, the axial control winding on the outside can also more conveniently lead out the winding lead.

[0031] In some embodiments, the magnetic bearing further includes a positioning ring 300, the axial core 101 includes a first core shell 1011 and a second core shell 1012 that are relatively assembled, the inner side of the first core shell 1011 has a first positioning ring platform, the positioning ring 300 is cooperatively connected to one axial side of the first positioning ring platform, and the axial winding assembly 102 is connected to the side of the positioning ring 300 away from the first positioning ring platform, the first core shell 1011 and the second core shell 1012 form an axial clamping for the axial winding assembly 102 and the positioning ring 300. It should be noted that the positioning ring 300 in this technical solution, on the one hand, serves as an assembly carrier of the axial winding assembly 102, so that the axial and radial positions of the axial winding assembly 102 are determined, and at the same time, it can also serve as a positioning reference for other components inside the bearing, thereby facilitating more accurate positioning of other internal components.

[0032] As a specific implementation, the axial winding assembly 102 includes a skeleton support ring 1021 and an axial control winding 1022 wound within the annular groove of the skeleton support ring 1021. The axial winding assembly 102 is detachably connected to the positioning ring 300 via the skeleton support ring 1021. For example, the skeleton support ring 1021 includes a snap that matches the positioning ring 300, and the snap connection between the two achieves positioning. In terms of specific assembly, the axial control winding 1022 can be first wound within the annular groove of the skeleton support ring 1021, and then the entire axial winding assembly 102 can be connected to the positioning ring 300, which is convenient for assembly. In one embodiment, the positioning ring 300 has a wire outlet hole connected along its axial direction, and the lead wire of the axial control winding 1022 passes through the wire outlet hole. Preferably, a wire skeleton 301 is inserted into the wire outlet hole, and the lead wire of the axial control winding 1022 passes through the central through hole of the wire skeleton 301. The material of the wire skeleton 301 can be selected to be an insulating material with a certain degree of flexibility to protect the lead wire passing therethrough, prevent wear and improve insulation performance. It should be noted that the axial control winding 1022 in the present invention is only provided in one group. Since it is located radially outside the radial control component, it can be located in the center position of the radial control component in the axial direction. The electromagnetic control flux it generates can basically achieve equal output on both sides, with less leakage magnetic flux. At the same time, compared with the setting method of two axial control windings in the prior art, the wiring process and assembly of the single control winding are convenient for installation.

[0033] In some embodiments, the radial control assembly 200 includes a magnetic ring 203, a radial iron core 201, and a radial control winding 202 wound on the stator teeth of the radial iron core 201. The magnetic ring 203 is mounted on the outer circumferential wall of the radial iron core 201. The center hole wall of the positioning ring 300 has a second positioning ring platform, and the magnetic ring 203 is cooperatively connected to the axial side of the second positioning ring platform. In this way, it should be noted that the installation reference of the radial core 201 in this technical solution is jointly determined by the first positioning ring platform on the radially outermost axial core 101 (specifically, the first core shell 1011) - the positioning ring 300 - the second positioning ring platform on the inner side of the positioning ring 300 - the magnetic ring 203 - the center through hole wall of the magnetic ring 203. This positioning dimension chain does not involve the magnetic steel (such as permanent magnets) in the prior art. The positioning matching surfaces of each component in this dimension chain (such as the axial side and the circumferential wall of the first positioning ring platform, the axial side and the circumferential wall of the second positioning ring platform, the axial side and the inner and outer circumferential walls of the positioning ring, the axial side and the inner and outer circumferential walls of the magnetic ring) can all be machined to ensure their shape and position accuracy, thereby making the positioning of the radial core 201 more accurate. However, the positioning of the radial core 201 in the prior art is related to the magnetic steel, and the positioning accuracy error of the radial core 201 is relatively large.

[0034] In some embodiments, the magnetic bearing further comprises a magnetic steel assembly 400, wherein the magnetic steel assembly 400 comprises two groups, and the two groups of magnetic steel assemblies 400 are respectively connected to the two axial end faces of the magnetic ring 203. Specifically, the magnetic steel assembly 400 comprises a plurality of magnets 401 and a magnetic steel positioning ring 402. The magnetic steel positioning ring 402 has a plurality of positioning grooves spaced along its circumference. The plurality of magnets 401 are respectively located in the plurality of positioning grooves in a one-to-one correspondence, and the plurality of positioning grooves are evenly arranged along the circumference of the magnetic steel positioning ring 402, so that the arrangement intervals of the plurality of magnets 401 are consistent. As described above, the present invention adjusts the magnetic steel from the position of precise positioning in the prior art to the axial sides of the magnetic ring 203, without considering the adverse effects of the magnetic steel precision on the positioning accuracy of the radial core 201. That is, the radial stator core positioning structure is easier to design, manufacture, and assemble because it does not need to consider avoiding permanent magnets. In addition, under the premise that the output requirements of the magnetic levitation bearing are the same, a single permanent magnet with only half the size of the center can be selected on both sides to reduce material costs.

[0035] The magnetic steel 401 is adhered to the axial end face of the magnetic conductive ring 203; and / or the magnetic steel positioning ring 402 is detachably connected to the axial end face of the magnetic conductive ring 203. For example, a corresponding plug-in structure or a threaded connection structure can be provided between the magnetic steel positioning ring 402 and the magnetic conductive ring 203 to realize a detachable connection between the two.

[0036] In some embodiments, the magnetic bearing further comprises a rotor assembly 500, the rotor assembly 500 comprising a non-magnetic collar 501 and a rotor core 502 sleeved on its outer circumference, the axial ends of the rotor core 502 are provided with core axial end baffles 503 for axial positioning of the rotor core 502, the core axial end baffles 503 are magnetically conductive, and the core axial end baffles 503 are adjacent to the first core shell 1011 or the second core shell 1011. 12, an axial adjustment gap is formed between them; or, the rotor assembly 500 includes a magnetic conductive ring 505 and a rotor core 502 sleeved on its outer circumferential side, and core shaft end baffles 503 are provided at both axial ends of the rotor core 502 to axially position the rotor core 502, the core shaft end baffles 503 are magnetic, and an axial adjustment gap is formed between the core shaft end baffles 503 and the first core shell 1011 or the second core shell 1012 adjacent thereto.

[0037] In some embodiments, when the rotor assembly 500 includes a magnetic conductive collar 505 , a magnetic isolation plate 504 is further provided between the core shaft end baffle 503 and the corresponding end of the rotor core 502 .

[0038] In some embodiments, the magnetic bearing further includes a rotor assembly 500, which includes a rotor core 502. The rotor core 502 is mounted on the outer circumferential side of the thrust plate 600, and core shaft end baffles 503 are provided at both axial ends of the rotor core 502 to axially position the rotor core 502. The core shaft end baffles 503 are magnetically conductive.

[0039] In some embodiments, at least one of the two core shaft end baffles 503 has an extension ring extending axially toward one side of the rotor core 502 , and the extension ring is sleeved between the central through hole of the rotor core 502 and the outer circumferential wall of the thrust plate 600 .

[0040] In some embodiments, the rotor assembly 500 further includes a non-magnetic collar 501 or a magnetic collar 505 , and the rotor core 502 and the non-magnetic collar 501 or the magnetic collar 505 are positioned with the thrust plate 600 via positioning screws.

[0041] The magnetic bearing of the present invention can be assembled in the following manner:

[0042] like Figure 3As shown, the radial control winding 202 is embedded in the radial core 201 to form a radial bearing assembly, the magnetic ring 203 is heated, and the radial bearing assembly is heat-shrink-fitted into the magnetic ring 203, and fits tightly with the inner wall boss of the magnetic ring 203 (that is, the second positioning ring platform mentioned above). After the magnetic ring 203 cools down, the radial bearing assembly is fixedly installed, and the magnetic steel 401 is adhered to both sides of the magnetic ring 203 by strong glue to form a total radial bearing assembly; the axial control winding 1022 is wound around the inner side of the axial winding support ring (that is, the skeleton support ring 1021 mentioned above) to form an axial winding assembly, and the axial control winding 1022 is integrated with the axial winding support ring through the boss buckle on the skeleton to form a total axial winding, and the total axial winding cooperates with the positioning ring 300 to achieve radial and axial fixation of the axial winding skeleton. At the same time, the positioning ring 300 should be made of magnetic isolation material to prevent magnetic leakage, and the axial lead-out wire is led out through the wire skeleton 301; the front axial core (that is, the first core shell 1011) is heated, and the positioning ring 300, the total axial winding, and the total radial bearing assembly are sequentially inserted. There is a step positioning (that is, the first positioning ring platform) on the inner side of the front axial core, and the positioning ring 300 boss fits tightly to achieve fixed installation. There is a step positioning on the inner side of the magnetic ring 203, and the total radial bearing assembly fits tightly with the step and is fixedly installed by screw locking to form a three-degree-of-freedom front bearing assembly. The three-degree-of-freedom front bearing assembly, the rotor assembly 500500, and the rear axial core (the second core shell 1012) are sequentially assembled into the interior of the compressor to form a three-degree-of-freedom magnetic suspension bearing to achieve suspension control of the three degrees of freedom of the rotating shaft.

[0043] Among them, the permanent magnet (that is, the aforementioned magnetic steel 401) generates an axial-radial bias magnetic field, forming bias magnetic field strengths in the radial and axial air gaps respectively. When the thrust plate 600 is located at the center, the magnetic field strengths in the symmetrical radial and axial air gaps of the magnetic levitation bearing are the same, and the thrust plate is stably suspended. When the thrust plate radially deviates from the center, the magnetic field strengths in the symmetrical radial air gaps of the magnetic levitation bearing are different, and the thrust plate continues to deviate radially until it becomes unstable. A radial control winding is required to generate a radial control magnetic field to adjust the magnetic field strength of the radial air gap, so that the thrust plate is deviated in the opposite direction until it reaches the center, thereby achieving radial stable suspension. The axial control logic is the same, and stable suspension of the three-degree-of-freedom bearing is achieved.

[0044] According to an embodiment of the present invention, a compressor is further provided, comprising the above-mentioned magnetic bearing.

[0045] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0046] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A magnetic bearing, characterized in that: The invention comprises an axial control component (100) and a radial control component (200), wherein the axial control component (100) comprises an axial core (101) and an axial winding component (102) located within the axial core (101), and the axial winding component (102) is sleeved on the outer circumference of the radial control component (200); and further comprises a positioning ring (300), wherein the axial core (101) comprises a first core shell (1011) and a second core shell (1012) which are relatively assembled, wherein the inner side of the first core shell (1011) has a first positioning ring platform, and the positioning ring (300) is cooperatively connected to an axial side of the first positioning ring platform, and the axial winding component (102) is connected to a side of the positioning ring (300) away from the first positioning ring platform, and the first core shell (1011) and the second core shell (1012) form an axial clamping for the axial winding component (102) and the positioning ring (300).

2. The magnetic bearing according to claim 1, characterized in that: The axial winding assembly (102) comprises a skeleton support ring (1021) and an axial control winding (1022) wound in a ring groove of the skeleton support ring (1021); the axial winding assembly (102) is detachably connected to the positioning ring (300) via the skeleton support ring (1021).

3. The magnetic bearing according to claim 2, characterized in that: The positioning ring (300) has a wire outlet hole connected along its axial direction, and the lead wire of the axial control winding (1022) passes through the wire outlet hole.

4. The magnetic bearing according to claim 3, characterized in that: A wire skeleton (301) is inserted into the wire outlet hole, and the lead wire of the axial control winding (1022) passes through the central through hole of the wire skeleton (301).

5. The magnetic bearing according to claim 1, characterized in that: The radial control assembly (200) comprises a magnetic ring (203), a radial iron core (201), and a radial control winding (202) wound on the stator teeth of the radial iron core (201); the magnetic ring (203) is sleeved on the outer circumferential wall of the radial iron core (201); a second positioning ring platform is provided on the central hole wall of the positioning ring (300); and the magnetic ring (203) is cooperatively connected to an axial side of the second positioning ring platform.

6. The magnetic bearing according to claim 5, characterized in that: It also includes a magnetic steel assembly (400), wherein the magnetic steel assembly (400) has two groups, and the two groups of magnetic steel assemblies (400) are respectively connected to the two axial end faces of the magnetic conductive ring (203).

7. The magnetic bearing according to claim 6, characterized in that: The magnetic steel assembly (400) comprises a plurality of magnetic steels (401) and a magnetic steel positioning ring (402). The magnetic steel positioning ring (402) has a plurality of positioning grooves arranged at intervals along its circumference, and the plurality of magnetic steels (401) are respectively located in the plurality of positioning grooves in a one-to-one correspondence.

8. The magnetic bearing according to claim 7, characterized in that: The magnetic steel (401) is adhered to the axial end surface of the magnetic conductive ring (203); and / or the magnetic steel positioning ring (402) is detachably connected to the axial end surface of the magnetic conductive ring (203).

9. The magnetic bearing according to claim 1, characterized in that: The invention also includes a rotor assembly (500), wherein the rotor assembly (500) includes a non-magnetic collar (501) and a rotor core (502) sleeved on the outer circumference thereof, and core shaft end baffles (503) are provided at both axial ends of the rotor core (502) to axially position the rotor core (502), and the core shaft end baffles (503) are magnetically conductive, and an axial connection is formed between the core shaft end baffles (503) and the first core shell (1011) or the second core shell (1012) adjacent thereto. Alternatively, the rotor assembly (500) comprises a magnetically conductive collar (505) and a rotor core (502) sleeved on its outer circumference, wherein core axial end baffles (503) are provided at both axial ends of the rotor core (502) to axially position the rotor core (502), the core axial end baffles (503) are magnetically conductive, and an axial adjustment gap is formed between the core axial end baffles (503) and the adjacent first core shell (1011) or second core shell (1012).

10. The magnetic bearing according to claim 9, characterized in that: When the rotor assembly (500) includes a magnetic conductive collar (505), a magnetic isolation plate (504) is further provided between the core shaft end baffle (503) and the corresponding end of the rotor core (502).

11. The magnetic bearing according to claim 1, characterized in that: The invention also includes a rotor assembly (500), wherein the rotor assembly (500) includes a rotor core (502), the rotor core (502) is sleeved on the outer circumference of the thrust plate (600), and core shaft end baffles (503) are provided at both axial ends of the rotor core (502) to axially position the rotor core (502), and the core shaft end baffles (503) are magnetically conductive.

12. The magnetic bearing according to claim 11, 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), and the extension collar is sleeved between the central through hole of the rotor core (502) and the outer circumferential wall of the thrust plate (600).

13. The magnetic bearing according to claim 11, characterized in that: The rotor assembly (500) further comprises a non-magnetic collar (501) or a magnetic collar (505), and the rotor core (502) and the non-magnetic collar (501) or the magnetic collar (505) are positioned with the thrust plate (600) via positioning screws.

14. A compressor, characterized in that: The magnetic bearing comprises the magnetic bearing according to any one of claims 1 to 13.

Images