WO2023226404A1

WO2023226404A1 - Magnetic bearing and compressor

Info

Publication number: WO2023226404A1
Application number: PCT/CN2022/140855
Authority: WO
Inventors: 陈艳霞; 张立泽; 吴瑞; 董如昊; 刘湛钦
Original assignee: 珠海格力电器股份有限公司
Priority date: 2022-05-26
Filing date: 2022-12-22
Publication date: 2023-11-30
Also published as: CN115013435A

Abstract

The present disclosure provides a magnetic bearing and a compressor. The magnetic bearing comprises an outer iron core; a first iron core is sleeved in the outer iron core; a permanent magnet is provided between the first iron core and the outer iron core; a bearing rotor is sleeved in the first iron core; a first coil is provided on only one side of the first iron core in the axial direction; the first coil may generate a magnetic field when energized; the first coil can work in conjunction with the permanent magnet to generate axial magnetic force on the bearing rotor, so that the bearing rotor is axially suspended; a second coil is wound on the first iron core; the second coil may generate a magnetic field when energized; and the second coil can work in conjunction with the permanent magnet to generate radial magnetic force on the bearing rotor, so that the bearing rotor is radially suspended. According to the present disclosure, the defects in the related art that two axial coils are required, the cost is high, and the axial coils occupy a large space can be overcome.

Description

A magnetic levitation bearing and compressor

Cross-references to related applications

This disclosure is based on the Chinese patent application with application number 202210582906.3, the filing date is May 26, 2022, and the invention name is "A magnetic suspension bearing and compressor", and claims its priority. The disclosure of this Chinese patent application The contents are hereby incorporated into this disclosure as a whole.

Technical field

The present disclosure relates to the field of bearing technology, and specifically to a magnetic suspension bearing and a compressor.

Background technique

Magnetic bearings use the electromagnetic force on the rotor to levitate the rotating shaft. The rotating shaft and the stator maintain a non-contact state, so they have the advantages of no wear, high speed, high precision, and long life. However, compared with traditional magnetic levitation bearings, three-degree-of-freedom magnetic levitation bearings combine radial bearings and axial bearings, use permanent magnets to generate bias magnetic fields, and simultaneously realize movement of the rotating shaft in three degrees of freedom, radial and axial. It can effectively reduce the bearing volume, mass and rotor length, and increase the critical speed of the rotor.

The related technology of three-degree-of-freedom magnetic levitation bearing uses a symmetrical structure to distribute two axial coils on both sides of the bearing. The axial coil takes up a large space. Both axial coils are plugged into the iron core. The stability of the axial coil is poor. Moreover, the cost of designing two axial coils is higher.

Contents of the invention

Therefore, the present disclosure provides a magnetic levitation bearing and a compressor, which can overcome the defects in the related art that two axial coils are required, the cost is high, and the axial coils occupy a large space.

In order to solve the above problem, the present disclosure provides a magnetic suspension bearing, including: an outer iron core, a first iron core is set inside the outer iron core, and a permanent magnet is provided between the first iron core and the outer iron core. Magnet, a bearing rotor is set inside the first iron core, a first coil is provided on only one side in the axial direction of the first iron core, the first coil can generate a magnetic field when energized, and the first coil is connected with the magnet. The cooperation of the permanent magnets can produce axial magnetic force on the bearing rotor, so that the bearing rotor is axially suspended. A second coil is wound on the first iron core, and the second coil can generate a magnetic field when energized. The second coil cooperates with the permanent magnet to generate a radial magnetic force on the bearing rotor, so that the bearing rotor is suspended in a radial direction.

In some embodiments, it also includes a skeleton, the skeleton is fixed on the first iron core through a first locking piece, and the first coil is wound around the skeleton.

In some embodiments, one side of the frame is fixed on the first iron core through the first locking piece.

In some embodiments, a mounting ring is further included. The mounting ring is sleeved in the outer iron core. A fourth iron core is sleeved in the mounting ring. The first iron core is sleeved in the third iron core. In the four iron cores, a gap is provided between the fourth iron core and the outer iron core, and the permanent magnet is arranged in the gap.

In some embodiments, the mounting ring is located on the other axial side of the first iron core, and the first coil is located between the fourth iron core and the axially inner side of the outer iron core.

In some embodiments, the permanent magnets are segmented permanent magnets, and the permanent magnets are evenly distributed between the first iron core and the outer iron core along the circumferential direction of the outer iron core.

In some embodiments, a fixed frame is provided between the first iron core and the outer iron core, and the fixed frame can limit the displacement of the permanent magnet.

In some embodiments, the radially outer wall of the first iron core is the first wall, the radially inner wall of the first iron core is the second wall, and the first coil is located in the first iron core. on the first iron core near the first wall, and the second coil is located on the first iron core close to the second wall.

In some embodiments, the first iron core is annular, has at least 4 radial magnetic poles on the first iron core, and the second coil is wound around the radial magnetic poles. Two coils are evenly distributed on the first iron core, and every two second coils are divided into one group. The two second coils in each group are arranged oppositely, and the two second coils in each group are arranged oppositely. The coils are connected in series.

In some embodiments, the outer iron core includes a second iron core and a third iron core, both of the second iron core and the third iron core are annular, and the second iron core and the third iron core are ring-shaped. The longitudinal sections of the three iron cores are all C-shaped, the free end of the second iron core located radially outside is formed as a first surface, and the free end located radially outside of the third iron core is formed as a second surface , the first surface is opposite to and connected with the second surface.

In some embodiments, the magnetic suspension bearing can cooperate with the first rotor of the motor, and is characterized in that: the bearing rotor includes a first stopper, a fifth iron core and a second stopper, and the first stopper , the fifth iron core and the second blocker are both sleeved on the first rotor, and the fifth iron core is located between the first blocker and the second blocker, and the first blocker Cooperating with the second stopper, the fifth iron core can be limited.

In some embodiments, a protective member is further included, and the protective member is sleeved on the rotor, and the first baffle, the fifth iron core, and the second baffle are all sleeved on the protective member.

In some embodiments, a magnetic isolation member is provided between the first stopper and the fifth iron core, and between the second stopper and the fifth iron core.

The present disclosure also provides a compressor, including the above-mentioned magnetic suspension bearing.

The present disclosure provides a magnetic levitation bearing and compressor. The first coil is provided on only one side of the first iron core in the axial direction to provide an axial magnetic circuit, which reduces the coil manufacturing process. The process is simple and saves the cost of the outer iron core. Internal space, easy installation, stable assembly, reducing the processing cost of magnetic bearings.

Description of the drawings

Figure 1 is a cross-sectional view of a magnetic suspension bearing according to an embodiment of the present disclosure;

Figure 2 is a front view of the magnetic suspension bearing according to the embodiment of the present disclosure;

Figure 3 is a schematic structural diagram of a fixed frame in a magnetic suspension bearing according to an embodiment of the present disclosure;

Figure 4 is a first structural schematic diagram of the bearing rotor in the magnetic suspension bearing according to the embodiment of the present disclosure;

Figure 5 is a second structural schematic diagram of the bearing rotor in the magnetic suspension bearing according to the embodiment of the present disclosure;

Figure 6 is a third structural schematic diagram of the bearing rotor in the magnetic suspension bearing according to the embodiment of the present disclosure;

Figure 7 is a fourth structural schematic diagram of the bearing rotor in the magnetic suspension bearing according to the embodiment of the present disclosure;

Figure 8 is a fifth structural schematic diagram of the bearing rotor in the magnetic suspension bearing according to the embodiment of the present disclosure;

Figure 9 is a sixth structural schematic diagram of the bearing rotor in the magnetic suspension bearing according to the embodiment of the present disclosure;

Figure 10 is a seventh structural schematic diagram of the bearing rotor in the magnetic suspension bearing according to the embodiment of the present disclosure.

The reference symbols are expressed as:

1. The third iron core; 2. The first coil; 3. Fixing frame; 4. Permanent magnet; 5. Mounting ring; 6. The second iron core; 7. The second coil; 8. The first locking piece; 9 , The fourth iron core; 10. Skeleton; 11. The first iron core; 12. The first rotor; 13. The axial magnetic circuit; 14. The permanent magnet bias magnetic circuit; 15. The first radial magnetic circuit; 16. Second radial magnetic circuit; 17. First stopper; 18. Fifth iron core; 19. Second stopper; 20. Protection piece; 21. Magnetic isolation piece; 22. Second locking piece, 23. Bearing rotor.

Detailed ways

Referring to FIGS. 1 to 10 , according to an embodiment of the present disclosure, a magnetic suspension bearing is provided, including: an outer iron core, and a first iron core 11 is set inside the outer iron core. A permanent magnet 4 is provided between 11 and the outer core. A bearing rotor 23 is set inside the first core 11. A first coil 2 is provided on only one side of the first core 11 in the axial direction. The first coil 2 can generate a magnetic field when energized, and the first coil 2 can cooperate with the permanent magnet 4 to generate an axial magnetic force on the bearing rotor 23 to make the bearing rotor 23 axially suspended. A second coil 7 is wound around the first iron core 11. The second coil 7 can generate a magnetic field when energized. The second coil 7 can cooperate with the permanent magnet 4 to generate a radial magnetic force on the bearing rotor 23. So that the bearing rotor 23 is radially suspended. In this technical solution, the first iron core 11 is preferably a silicon steel sheet. The two-sided axial coils in the related technology are replaced with one-sided axial coils, and the number of coil turns is increased, so that the first coil 2 is connected with the permanent magnet. 4. The cooperation can produce axial magnetic force on the bearing rotor 23, so that the bearing rotor 23 is axially suspended, ensuring the space in the outer iron core, the structure is simpler, and the implementation method is easier, making the overall structure of the bearing More compact, it can significantly reduce the bearing size in the axial and radial directions and reduce production costs.

The axial magnetic circuit 13 generated by the first axial coil 2 is used to control the axial movement of the bearing rotor. The first coil 2 is supplied with a positive current, and the axial magnetic circuit 13 passes through the third iron core 1, the second iron core 6, The bearing rotor 23 is closed, and the permanent magnet bias magnetic circuit 14 generated by the permanent magnet 4 is divided into two paths: the left end and the right end. The left end magnetic path passes through the fourth iron core 9, the first iron core 11, the fifth iron core 18, and the first gear. Part 17. The third iron core 1 and the permanent magnet 4 are closed. The direction of the magnetic circuit at the left end of the bearing rotor 23 is the same. The magnetic fields are superimposed and the output force at the left end increases. The right end magnetic circuit passes through the fourth iron core 9, the first iron core 11 and the fifth iron. The core 18, the second stopper 19, the second iron core 6, and the permanent magnet 4 are closed. The direction of the magnetic circuit at the right end of the bearing rotor 23 is opposite. The magnetic field weakens and the output force at the right end decreases. The bearing rotor 23 receives a large force to the left, causing the first Rotor 12 moves to the left. On the contrary, when a negative current flows through the first coil 2, the magnetic field at the right end of the bearing rotor 23 is enhanced, and the bearing rotor 23 receives a large force to the right, causing the first rotor 12 to move to the right, thereby controlling the first rotor 12 by controlling the magnitude and sign of the current. Movement of the rotor 12 in the axial direction.

The second coil 7 generates a radial first radial magnetic circuit 15. Positive current flows through the coil, and the first radial magnetic circuit 15 is closed. As shown in Figure 2, the upper right circuit is closed clockwise, the lower left circuit is closed counterclockwise, and the permanent magnet The direction of the bias magnetic circuit generated by 4 points to the center of the circle, the magnetic field of the upper left magnetic pole is weakened, and the magnetic field of the lower right magnetic pole is strengthened. The bearing rotor 23 receives a large force to the right and downward; the second coil 7 generates the second radial magnetic circuit 16, and the coil passes into the positive direction. current, the second radial magnetic circuit 16 is closed. Affected by the magnetic field of the permanent magnet 4, the magnetic field of the upper right magnetic pole is weakened and the magnetic field of the lower left magnetic pole is strengthened. The bearing rotor 23 receives a large force to the left and downward, and vice versa. By adjusting the radial current The magnitude and positive and negative are used to control the movement of the bearing rotor 23 in the radial direction. Although there is a coupling phenomenon in the above-mentioned magnetic circuit, the radial direction movement of the control shaft is wide, and the control method is simple.

In a specific embodiment, the radially outer wall surface of the first iron core 11 is the first wall surface, the radially inner wall surface of the first iron core 11 is the second wall surface, and the first coil 2 is located there. The first iron core 11 is located close to the first wall, and the second coil 7 is located on the first iron core 11 close to the second wall.

In this technical solution, the first coil 2 is located on the first iron core 11 close to the first wall, and the second coil 7 is located on the first iron core 11 close to the second wall, which can form a more The balanced magnetic circuit effectively improves the magnetic circuit stability of the magnetic suspension bearing and improves the working performance of the magnetic suspension bearing.

In a specific embodiment, it also includes a skeleton 10 , which is fixed on the first iron core 11 through a first locking member 8 , and the first coil 2 is wound around the skeleton 10 . specific. The frame 10 is U-shaped, and the opening of the frame 10 faces the outer iron core. One side of the frame 10 is fixed on the first iron core 11 through the first locking member 8 .

In this technical solution, the first locking member 8 is preferably a screw, and the skeleton 10 is assembled on the first iron core 11 using locking screws. The assembly is stable. By winding the first coil 2 through the skeleton 10, a control magnetic field can be provided to control the bearing rotor 23. axial movement, the opening of the frame 10 faces the outer iron core. In order to facilitate coil winding, the opening of the frame 10 faces the outer iron core and facilitates the assembly of the frame 10.

In a specific embodiment, it also includes a mounting ring 5. The mounting ring 5 is sleeved in the outer iron core. The mounting ring 5 is sleeved with a fourth iron core 9. The first iron core 11 is set in the fourth iron core 9, a gap is provided between the fourth iron core 9 and the outer iron core, and the permanent magnet 4 is arranged in the gap. The mounting ring 5 is located on the other axial side of the first iron core 11 , and the first coil 2 is located between the fourth iron core 9 and the axial inner side of the outer iron core.

In this technical solution, the fourth iron core 9 is used to facilitate the installation of the first iron core 11 . The mounting ring 5 reduces the difficulty of assembling the first iron core 11 and the fourth iron core 9. The mounting ring 5 is located on the other axial side of the first iron core 11 to avoid the compact position of the mounting ring 5 and the frame 10, which may affect Skeleton 10 installed. The purpose of the installation ring 5 is to facilitate the interference assembly of the first iron core 11 and to leave a gap between the fourth iron core 9 and the outer iron core to assemble the permanent magnet 4 . The first coil 2 is wound around the axial frame 10, and the axial frame 10 is locked on the first iron core 11 through the first locking member 8 to fix the first coil 2 and prevent the axial coil from loosening. Take off.

Align the slots on the second iron core 6 and install the segmented permanent magnet 4 with the N pole facing the center of the circle so that the bias magnetic circuit points to the center of the circle. Then use the fixing bracket 3 to fix the permanent magnet so that it is not easy to loosen. You can also S The pole faces the center of the circle, and the bias magnetic path points from the center to the circumference. However, it should be noted that the direction of movement of the radial axis to the rotating axis is opposite to the direction briefly described above. This three-degree-of-freedom magnetic bearing structure combines radial bearings and axial bearings to effectively reduce the bearing volume, shorten the rotor length, increase the critical speed of the rotor, save costs, and improve compressor performance.

In a specific embodiment, the permanent magnets 4 are segmented permanent magnets. Along the circumferential direction of the outer iron core, the permanent magnets 4 are evenly distributed between the first iron core 11 and the outer iron core. between cores. Specifically, as shown in FIG. 3 , a fixing bracket 3 is provided between the first iron core 11 and the outer iron core. The fixing bracket 3 can limit the displacement of the permanent magnet 4 .

In this technical solution, the 4N pole of the permanent magnet faces the center of the circle, so that the bias magnetic circuit points to the center of the circle. The segmented permanent magnets are easy to process, simple to magnetize, and easy to install. They also provide bias magnetic circuits for both radial and axial directions, reducing the need for permanent magnets. The number of magnets is reduced, the cost is reduced, and the permanent magnets 4 are prevented from loosening through the fixing bracket 3.

In a specific embodiment, the first iron core 11 is annular, has at least 4 radial magnetic poles on the first iron core 11, and the second coil 7 is wound around the radial magnetic poles, The four second coils 7 are evenly distributed on the first iron core 11, and every two second coils 7 are divided into a group, and the two second coils 7 of each group are arranged opposite each other, and, The two second coils 7 of each group are connected in series. In this technical solution, the first iron core 11 uses four magnetic poles, and four coils are wound on it to provide a radial magnetic field to ensure radial magnetic force, and realize movement control of the bearing rotor 23 in the radial direction.

In one embodiment, as shown in FIG. 2 , the upper left coil and the lower right coil are connected in series, and the lower left coil and the upper right coil are connected in series to control the movement of the rotating shaft in the radial direction. The outer iron core includes a second iron core 6 and a third iron core 1. Both the second iron core 6 and the third iron core 1 are annular. The second iron core 6 and the third iron core 1 are ring-shaped. The longitudinal sections of the iron core 1 are all C-shaped, the free end of the second iron core 6 located on the radially outer side is formed as a first surface, and the free end of the third iron core 1 located on the radially outer side is formed as a third surface. Two sides, the first side is opposite to and connected with the second side. In this technical solution, the outer iron core is annular, and the bearing rotor 23 is located between the C-shaped openings of the outer iron core. This makes it easier to place components in the outer iron core 2 and is more conducive to forming a complete magnetic circuit. , better magnetic performance.

In a specific embodiment, as shown in Figure 9, the magnetic suspension bearing can cooperate with the first rotor 12 of the motor. The bearing rotor 23 includes a first block 17, a fifth iron core 18 and a second block. 19, the first blocking member 17, the fifth iron core 18 and the second blocking member 19 are all sleeved on the first rotor 12, and the fifth iron core 18 is located on the first blocking member 17 and the second stopper 19 , the first stopper 17 and the second stopper 19 cooperate to limit the fifth iron core 18 . In this technical solution, the first stopper 17 , the fifth iron core 18 , and the second stopper 19 all have an interference fit with the first rotor 12 .

In a specific embodiment, as shown in FIG. 4 , a protective member 20 is also included. The protective member 20 is sleeved on the first rotor 12 . The first stopper 17 , the fifth iron core 18 and The second blocking members 19 are sleeved on the protective member 20 .

In this technical solution, the fifth iron core 18 is preferably a silicon steel sheet, the second iron core 6 and the third iron core 1 are aligned with the guard 20, and the axial control magnetic circuit is from the second iron core 6 and the guard 20 to the third iron core. 1. The permanent magnet bias magnetic circuit is: from the fifth iron core 18 and the protective member 20 to the second iron core 6, and from the fifth iron core 18 and the protective member 20 to the third iron core 1;

As shown in Figure 5, the second iron core 6 and the third iron core 1 are aligned with the first stopper 17 and the second stopper 19, and the axial control magnetic circuit passes from the second iron core 6, the second stopper 19, the fifth The iron core 18, the first stopper 17 to the third iron core 1, the permanent magnet bias magnetic circuit is: from the fifth iron core 18, the second stopper 19 to the second iron core 6, and, from the fifth iron core 18. The first stopper 17 to the third iron core 1;

In one embodiment, as shown in FIG. 6 , there are disposed between the first stopper 17 and the fifth iron core 18 and between the second stopper 19 and the fifth iron core 18 . Magnetic isolation piece 21.

In this technical solution, a magnetic isolation member 21 is provided between the first stopper 17 and the fifth iron core 18 and between the second stopper 19 and the fifth iron core 18. The second The iron core 6 and the third iron core 1 are aligned with the first stopper 17 and the second stopper 19, and the axial control magnetic circuit is from the second iron core 6, the second stopper 19, the guard 20, and the first stopper 17 to The third iron core 1, the permanent magnet bias magnetic circuit is: from the fifth iron core 18, the protective member 20, the first stopper 17 to the third iron core 1, and, from the fifth iron core 18, the protective member 20, The second stopper 19 reaches the second iron core 6 .

As shown in Figure 7, the first stopper 17 and the second stopper 19 are L-shaped. The first stopper 17, the second stopper 19 and the fifth iron core 18 constitute the bearing rotor 23, which all adopt interference fit. ;

As shown in Figure 8, the first stopper 17 is L-shaped, and the first stopper 17, the second stopper 19 and the fifth iron core 18 constitute the bearing rotor 23, all of which adopt interference fit;

As shown in Figure 10, on the basis of the bearing rotor 23, a second locking member 22 is provided in the middle of the first rotor 12 in the radial direction. The second locking member 22 is preferably a screw, and is locked with the screw in the radial direction to ensure The bearing rotor 23 is installed firmly.

The above are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent substitutions and improvements made within the principles of the present disclosure shall be included in the scope of protection of the present disclosure. Inside. The above are only preferred embodiments of the present disclosure. It should be noted that those of ordinary skill in the art can also make several improvements and modifications without departing from the technical principles of the present disclosure. These improvements and modifications It should also be regarded as the protection scope of this disclosure.

Claims

A magnetic suspension bearing includes: an outer iron core, a first iron core (11) is set inside the outer iron core, and a permanent magnet (11) is arranged between the first iron core (11) and the outer iron core. 4), the first iron core (11) is equipped with a bearing rotor (23), and only one side of the first iron core (11) in the axial direction is provided with a first coil (2). The coil (2) can generate a magnetic field when energized, and the first coil (2) and the permanent magnet (4) can produce an axial magnetic force on the bearing rotor (23), so that the bearing rotor (23) Axial suspension, the first iron core (11) is wound with a second coil (7), the second coil (7) is energized to generate a magnetic field, the second coil (7) and the permanent magnet ( 4) The cooperation can generate radial magnetic force on the bearing rotor (23), so that the bearing rotor (23) can be suspended in the radial direction.
The magnetic suspension bearing according to claim 1, wherein the radially outer wall surface of the first iron core (11) is a first wall surface, and the radially inner wall surface of the first iron core (11) is a second wall surface, The first coil (2) is located on the first iron core (11) close to the first wall, and the second coil (7) is located on the first iron core (11) close to the first wall. On the second wall.
The magnetic suspension bearing according to claim 1 or 2, further comprising a skeleton (10), the skeleton (10) being fixed on the first iron core (11) through a first locking piece (8), the third A coil (2) is wound around the frame (10).
The magnetic suspension bearing according to claim 3, wherein one side of the frame (10) is fixed on the first iron core (11) through the first locking piece (8).
The magnetic suspension bearing according to any one of claims 1 to 4, further comprising a mounting ring (5), the mounting ring (5) is sleeved in the outer iron core, and the mounting ring (5) is sleeved in the inner core. A fourth iron core (9) is provided, and the first iron core (11) is set in the fourth iron core (9), between the fourth iron core (9) and the outer iron core. A gap is provided, and the permanent magnet (4) is arranged in the gap.
The magnetic suspension bearing according to claim 5, wherein the mounting ring (5) is located on the other axial side of the first iron core (11), and the first coil (2) is located on the fourth iron core. between the core (9) and the axial inner side of the outer iron core.
The magnetic suspension bearing according to any one of claims 1 to 6, wherein the permanent magnet (4) adopts a segmented permanent magnet, and the permanent magnet (4) is uniform along the circumferential direction of the outer iron core. Distributed between the first iron core (11) and the outer iron core.
The magnetic suspension bearing according to claim 7, wherein a fixing bracket (3) is provided between the first iron core (11) and the outer iron core, and the fixing bracket (3) can limit the permanent magnet. (4) displacement.
The magnetic suspension bearing according to any one of claims 1 to 8, wherein the first iron core (11) is annular and has at least 4 radial magnetic poles, so The second coil (7) is wound on the radial magnetic pole, and four second coils (7) are evenly distributed on the first iron core (11), and every two second coils (7) ) are divided into one group, the two second coils (7) of each group are arranged oppositely, and the two second coils (7) of each group are connected in series.
The magnetic suspension bearing according to any one of claims 1 to 9, wherein the outer iron core includes a second iron core (6) and a third iron core (1), and the second iron core (6) and The third iron cores (1) are all ring-shaped, the free end of the second iron core (6) located radially outward is formed as a first surface, and the free end of the third iron core (1) located radially outside is formed as a first surface. The outer free end is formed as a second surface, and the first surface is opposite and connected to the second surface.
The magnetic suspension bearing according to any one of claims 1 to 10, the magnetic suspension bearing can cooperate with the first rotor (12) of the motor, wherein the bearing rotor (23) includes a first stopper (17) , the fifth iron core (18) and the second stopper (19), the first stopper (17), the fifth iron core (18) and the second stopper (19) are all sleeved on the first on the rotor (12), and the fifth iron core (18) is located between the first stopper (17) and the second stopper (19), and the first stopper (17) and the second stopper (19) The stopper (19) cooperates to limit the fifth iron core (18).
The magnetic suspension bearing according to claim 11, further comprising a protective member (20) sleeved on the first rotor (12), the first stopper (17), the fifth The iron core (18) and the second stopper (19) are both sleeved on the protective member (20).
The magnetic suspension bearing according to claim 11, wherein between the first stopper (17) and the fifth iron core (18), between the second stopper (19) and the fifth iron core Magnetic isolation parts (21) are arranged between (18).
A compressor includes the magnetic suspension bearing described in any one of 1 to 13.