Magnetic suspension bearing assembly, motor and compressor

Abstract

The invention discloses a magnetic suspension bearing assembly, a motor and a compressor, and relates to the field of magnetic suspension parts, the magnetic suspension bearing assembly comprises a permanent magnet, a first stator assembly, a second stator assembly and a rotor assembly; the first stator assembly is arranged on one side of the permanent magnet; the second stator assembly is arranged on the other side of the permanent magnet; the rotor assembly comprises a rotating shaft, a first rotor core, a second rotor core and a middle partition plate, the rotating shaft is sleeved with the first rotor core, the second rotor core and the middle partition plate, the first rotor core corresponds to the first stator assembly, the second rotor core corresponds to the second stator assembly, and the middle partition plate is arranged between the first rotor core and the second rotor core. The magnetic suspension bearing assembly provided by the invention can solve the problems of reduced magnetic conductivity and insufficient strength of a rotor core with a relatively long length.

Description

Technical Field

[0001] The present invention relates to the field of magnetic suspension components, and in particular to a magnetic suspension bearing assembly, a motor and a compressor. Background Art

[0002] In the existing technology, due to the manufacturing tolerances of silicon steel laminations, the precision limitations of the lamination process, and the lack of effective fixing measures between the laminations, the long rotor core after lamination has uneven air gaps between the laminations. These air gaps not only significantly weaken the overall magnetic conductivity of the rotor core, leading to uneven magnetic field distribution and increased eddy current losses, reducing the torque output capacity and operating efficiency of the motor, but also cause the silicon steel laminations to slide relative to each other due to the lack of tight constraints when the rotor core rotates at high speeds. This significantly reduces the overall strength of the rotor core and makes it prone to lamination loosening and falling off, seriously affecting the safety and stability of the magnetic levitation motor. In addition, as the length of the rotor core increases, the problems of reduced magnetic conductivity and insufficient strength caused by the air gap will become more serious, becoming a key technical bottleneck that restricts the performance improvement and long-life operation of the magnetic levitation motor. Summary of the Invention

[0003] The main purpose of the present invention is to provide a magnetic bearing assembly, a motor and a compressor, aiming to solve the problems of reduced magnetic conductivity and insufficient strength of a long rotor core.

[0004] To achieve the above-mentioned objectives, the present invention proposes a magnetic levitation bearing assembly, which includes a permanent magnet, a first stator assembly, a second stator assembly and a rotor assembly; the first stator assembly is arranged on one side of the permanent magnet; the second stator assembly is arranged on the other side of the permanent magnet; the rotor assembly includes a rotating shaft, and a first rotor core, a second rotor core and a middle partition plate that are sleeved on the rotating shaft, the first rotor core is arranged corresponding to the first stator assembly, the second rotor core is arranged corresponding to the second stator assembly, and the middle partition plate is arranged between the first rotor core and the second rotor core.

[0005] In one embodiment, the rotor assembly further includes a first baffle and a second baffle, wherein the first baffle is disposed on a side of the first rotor core away from the middle diaphragm, and the second baffle is disposed on a side of the second rotor core away from the middle diaphragm.

[0006] In one embodiment, the rotor assembly further includes a support ring, and the first baffle, the first rotor core, the middle partition, the second rotor core and the second baffle are sleeved on the outer circumference of the support ring.

[0007] In one embodiment, both end surfaces of the support ring sleeve are flush with the end surfaces of the first baffle and the second baffle.

[0008] In one embodiment, the first stator assembly includes a first radial magnetic conductive ring and a first stator core, and the first stator core is installed on the first radial magnetic conductive ring; the second stator assembly includes a second radial magnetic conductive ring and a second stator core, and the second stator core is installed on the second radial magnetic conductive ring; wherein, along the axial direction of the rotor assembly, the width of the first rotor core is not less than the width of the first stator core, and the width of the second rotor core is not less than the width of the second stator core.

[0009] In one embodiment, the first stator assembly further includes a first control winding, which is wound around the first stator core; the second stator assembly further includes a second control winding, which is wound around the second stator core; wherein the first control winding and the second control winding are formed by winding one coil.

[0010] In one embodiment, a first wiring hole and a fourth wiring hole are provided on the first stator core, and a second wiring hole and a third wiring hole are provided on the second stator core; in the axial direction of the stator core, the first wiring hole and the second wiring hole are correspondingly arranged, and the third wiring hole and the fourth wiring hole are correspondingly arranged, and the first wiring hole, the second wiring hole, the third wiring hole and the fourth wiring hole are used for routing coils to form the first control winding and the second control winding.

[0011] In one embodiment, the first wiring hole and the fourth wiring hole are distributed on opposite sides of the center of the stator core; the coil is wound around the first stator core to form the first control winding, and passes through the first wiring hole and the second winding hole in sequence, and is wound around the second stator core to form the second control winding, and passes through the third wiring hole and the fourth wiring hole in sequence to exit; wherein the input side and the output side of the coil are located on the same side of the first stator assembly.

[0012] The present invention also provides a motor comprising the magnetic bearing assembly. The magnetic bearing assembly comprises a permanent magnet, a first stator assembly, a second stator assembly, and a rotor assembly; the first stator assembly is disposed on one side of the permanent magnet; the second stator assembly is disposed on the other side of the permanent magnet; the rotor assembly comprises a rotating shaft, a first rotor core, a second rotor core, and a middle diaphragm surrounding the rotating shaft; the first rotor core is disposed corresponding to the first stator assembly, the second rotor core is disposed corresponding to the second stator assembly, and the middle diaphragm is disposed between the first and second rotor cores.

[0013] The present invention also provides a compressor comprising the magnetic bearing assembly. The magnetic bearing assembly comprises a permanent magnet, a first stator assembly, a second stator assembly, and a rotor assembly; the first stator assembly is disposed on one side of the permanent magnet; the second stator assembly is disposed on the other side of the permanent magnet; the rotor assembly comprises a rotating shaft, a first rotor core, a second rotor core, and a middle diaphragm surrounding the rotating shaft; the first rotor core is disposed corresponding to the first stator assembly, the second rotor core is disposed corresponding to the second stator assembly, and the middle diaphragm is disposed between the first and second rotor cores.

[0014] The technical solution of the present invention utilizes a multi-segment rotor core structure. Compared to traditional, longer rotor cores, the intermediate diaphragms split the long rotor core into multiple sections, shortening the length of each section. This reduces the cumulative gaps between stacked silicon steel laminations, improving magnetic conductivity and structural strength. Furthermore, the shortened core length shortens the pressure transmission path during stacking, resulting in more uniform compaction between laminations and avoiding the problem of "overpressure at both ends and looseness in the middle" that can occur with long cores. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0016] Figure 1 An exploded view of the structure of an embodiment of a magnetic bearing assembly provided by the present invention;

[0017] Figure 2 A cross-sectional view of the magnetic bearing assembly provided by the present invention;

[0018] Figure 3 for Figure 2 Schematic diagram of the structure of the middle rotor assembly;

[0019] Figure 4 It is a left side view of the magnetic bearing assembly;

[0020] Figure 5 This is the right side view of the magnetic bearing assembly.

[0021] Description of Figure Numbers:

[0022] 100. Magnetic bearing assembly; 10. Permanent magnet; 20. First stator assembly; 21. First radial magnetic ring; 22. First stator core; 23. First control winding; 30. Second stator assembly; 31. Second radial magnetic ring; 32. Second stator core; 33. Second control winding; 40. Rotor assembly; 41. First rotor core; 42. Second rotor core; 43. Middle partition; 44. First baffle; 45. Second baffle; 46. Support ring; 51. First wiring hole; 52. Second wiring hole; 53. Third wiring hole; 54. Fourth wiring hole; 60. Positioning frame.

[0023] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0026] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] In the existing technology, due to the manufacturing tolerances of silicon steel laminations, the precision limitations of the lamination process, and the lack of effective fixing measures between the laminations, the long rotor core after lamination has uneven air gaps between the laminations. These air gaps not only significantly weaken the overall magnetic conductivity of the rotor core, leading to uneven magnetic field distribution and increased eddy current losses, reducing the torque output capacity and operating efficiency of the motor, but also cause the silicon steel laminations to slide relative to each other due to the lack of tight constraints when the rotor core rotates at high speeds. This significantly reduces the overall strength of the rotor core and makes it prone to lamination loosening and falling off, seriously affecting the safety and stability of the magnetic levitation motor. In addition, as the length of the rotor core increases, the problems of reduced magnetic conductivity and insufficient strength caused by the air gap will become more serious, becoming a key technical bottleneck that restricts the performance improvement and long-life operation of the magnetic levitation motor.

[0028] The present invention provides a magnetic suspension bearing assembly, which divides the rotor core into multiple sections, thereby solving the problems of reduced magnetic conductivity and insufficient strength of a longer rotor core.

[0029] See also Figures 1 to 3 In one embodiment of the present invention, the magnetic bearing assembly 100 includes a permanent magnet 10, a first stator assembly 20, a second stator assembly 30 and a rotor assembly 40; the first stator assembly 20 is arranged on one side of the permanent magnet 10; the second stator assembly 30 is arranged on the other side of the permanent magnet 10; the rotor assembly 40 includes a rotating shaft, and a first rotor core 41, a second rotor core 42 and a middle partition 43 sleeved on the rotating shaft, the first rotor core 41 is arranged corresponding to the first stator assembly 20, the second rotor core 42 is arranged corresponding to the second stator assembly 30, and the middle partition 43 is arranged between the first rotor core 41 and the second rotor core 42.

[0030] Specifically, the permanent magnet 10 can be made of neodymium iron boron (NdFeB) permanent magnet material, in a circular ring shape, and magnetized circumferentially to provide a bias magnetic field. Alternatively, a positioning frame 60 can be provided, with the permanent magnet 10 arranged in a plurality of sector-shaped pieces, and the positioning frame 60 can be used to position and install the permanent magnet 10. The first stator assembly 20 and the second stator assembly 30 are respectively disposed on opposite axial sides of the permanent magnet 10.

[0031] The first stator assembly 20 is positioned to the left of the permanent magnet 10 and comprises a radial magnetic ring and a stator core (laminated silicon steel). The stator core is wound with a control winding (enameled copper wire). The second stator assembly 30 is symmetrically positioned to the right of the permanent magnet 10. Its structure is identical to the first stator assembly 20, forming a dual-stator symmetrical layout with the permanent magnet 10. This dual-stator symmetrical layout, combined with the permanent magnet 10, creates an inward and outward bias magnetic field distribution in the control air gaps on either side, preventing magnetic field saturation in a single air gap and improving magnetic field utilization.

[0032] See also Figure 3 The shaft axially passes through the entire rotor assembly 40 to provide mechanical support. The first rotor core 41 and the second rotor core 42 are both made of laminated silicon steel sheets and are distributed along the axial direction of the shaft, corresponding to the first stator assembly 20 on the left and the second stator assembly 30 on the right, respectively. The middle partition 43 is a circular metal plate, which is arranged between the first rotor core 41 and the second rotor core 42 for mechanical separation and axial positioning. The first rotor core 41, the middle partition 43 and the second rotor core 42 form a three-section structure. Compared with the traditional longer rotor core, the middle partition 43 splits the long rotor core into two sections, shortening the length of a single-section core, thereby reducing the cumulative gap between the laminated silicon steel sheets and improving the magnetic conductivity and structural strength. In addition, after the length of the single-section core is shortened, the pressure transmission path is shortened during stacking, and the compaction between the sheets is more uniform, avoiding the problem of "overpressure at both ends and looseness in the middle" of the long core.

[0033] The technical solution of the present invention utilizes a multi-segment rotor core structure. Compared to conventional, longer rotor cores, the intermediate partition 43 splits the long rotor core into multiple sections, shortening the length of a single core section. This reduces the cumulative gap between stacked silicon steel laminations, improving magnetic conductivity and structural strength. Furthermore, the shortened length of a single core section shortens the pressure transmission path during stacking, resulting in more uniform compaction between laminations and avoiding the problem of "overpressure at both ends and looseness in the middle" that can occur with long cores.

[0034] See also Figure 2 and Figure 3 In one embodiment, the rotor assembly 40 further includes a first baffle 44 and a second baffle 45. The first baffle 44 is arranged on the side of the first rotor core 41 away from the middle partition 43, and the second baffle 45 is arranged on the side of the second rotor core 42 away from the middle partition 43. Specifically, the first baffle 44 and the second baffle 45 are both annular metal plates, and the material can be stainless steel or aluminum alloy. The first baffle 44 is arranged at the left end of the first rotor core 41 (away from the side of the middle partition 43), and the second baffle 45 is arranged at the right end of the second rotor core 42 (away from the side of the middle partition 43). The first baffle 44 and the second baffle 45 are in contact with the rotor core through axial compression force to ensure that the stacked structure is tight and has no gaps. The first baffle 44 and the second baffle 45 serve as the axial limiting structure of the rotor assembly 40, enhancing the impact resistance during high-speed rotation and preventing the axial movement of the core.

[0035] Furthermore, the rotor assembly 40 further includes a support ring 46 , and the first baffle 44 , the first rotor core 41 , the middle partition 43 , the second rotor core 42 and the second baffle 45 are sleeved on the outer circumference of the support ring 46 .

[0036] Specifically, the support ring sleeve 46 is a hollow cylindrical sleeve, the inner wall of which is interference fit with the rotating shaft, and the outer wall is provided with a first baffle 44, a first rotor core 41, a middle partition 43, a second rotor core 42, and a second baffle 45. The length of the ring sleeve is equal to the total length of the rotor assembly 40, and the two ends extend to the left end of the first baffle 44 and the right end of the second baffle 45 respectively. The support ring sleeve 46 runs through the entire rotor assembly 40 to form a rigid support skeleton, integrating the segmented rotor core, baffle, and middle partition 43 into one, significantly improving the overall strength and torsional stiffness of the rotor assembly 40. In addition, the support ring sleeve 46 structure can also provide a uniform axial pressure transmission path to ensure that the laminated punchings are uniformly stressed and avoid local overpressure or loosening. The inner holes of the rotor core, middle partition 43, and baffle are all interference fit with the outer circle of the support ring sleeve 46 and can be fixed by a shrink fit process.

[0037] See also Figures 1 to 3 In one embodiment, the end faces of the support ring 46 are flush with the end faces of the first baffle 44 and the second baffle 45. Specifically, the end faces of the support ring 46 are flush with the end faces of the first baffle 44 and the second baffle 45. This means that the outer circumference of the support ring 46 is flush with the outer circumference of the first baffle 44 and the second baffle 45, that is, the outer diameters of the three are consistent, thereby forming a flat axial end face. This flush design facilitates the axial positioning and assembly of the rotor assembly 40 and the stator assembly, ensures air gap uniformity, improves electromagnetic control accuracy, and eliminates airflow disturbances caused by protrusions or depressions on the end faces, making it suitable for high-speed rotation scenarios.

[0038] See also Figures 1 to 3 In one embodiment, the first stator assembly 20 includes a first radial magnetic conductive ring 21 and a first stator core 22, and the first stator core 22 is installed on the first radial magnetic conductive ring 21; the second stator assembly 30 includes a second radial magnetic conductive ring 31 and a second stator core 32, and the second stator core 32 is installed on the second radial magnetic conductive ring 31; wherein, along the axial direction of the rotor assembly 40, the width of the first rotor core 41 is not less than the width of the first stator core 22, and the width of the second rotor core 42 is not less than the width of the second stator core 32.

[0039] With this arrangement, the width of the rotor core overlaps the stator core, ensuring that the control magnetic field generated by the stator core and the bias magnetic field of the permanent magnet 10 completely pass through the effective magnetic conductive area of the rotor core, avoiding leakage of the magnetic field edge caused by the "excessive width" of the stator core. In addition, when the rotor core width is greater than the stator core, the magnetic field energy is concentrated in the overlapping area of the air gap and the rotor core, avoiding a surge in local magnetic flux density at the edge of the stator core due to sudden changes in the magnetic circuit. At the same time, the wide rotor core design can disperse the magnetic flux density, reduce the risk of local saturation, and reduce rotor heating.

[0040] See also Figure 1 and Figure 2In one embodiment, the first stator assembly 20 further includes a first control winding 23, which is wound around the first stator core 22; the second stator assembly 30 further includes a second control winding 33, which is wound around the second stator core 32; wherein the first control winding 23 and the second control winding 33 are formed by winding one coil.

[0041] Specifically, the first control winding 23 and the second control winding 33 are wound by the same enameled copper wire. The coil is first wound around the first stator core 22 (left side) to form the first control winding 23, and then passed through the winding hole to be wound around the second stator core 32 (right side) to form the second control winding 33. The wires at both ends are concentrated on the same side of the first stator assembly 20.

[0042] The coils are wound in parallel or continuously, with the number of turns designed based on magnetic field requirements (e.g., 100-300 turns per phase). The windings are secured to the stator core slots using a varnishing process (e.g., epoxy resin) to ensure insulation and mechanical strength. Sharing coils reduces the number of windings, reducing copper losses and heat generation. Furthermore, the synchronous control of the dual stator windings further enhances magnetic field control symmetry and improves rotor suspension stability.

[0043] See also Figure 2 、 Figure 4 and Figure 5 Furthermore, a first wiring hole 51 and a fourth wiring hole 54 are provided on the first stator core 22, and a second wiring hole 52 and a third wiring hole 53 are provided on the second stator core 32; in the axial direction of the stator core, the first wiring hole 51 and the second wiring hole 52 are correspondingly arranged, and the third wiring hole 53 and the fourth wiring hole 54 are correspondingly arranged. The first wiring hole 51, the second wiring hole 52, the third wiring hole 53 and the fourth wiring hole 54 are used for wiring the coil to form the first control winding 23 and the second control winding 33.

[0044] Furthermore, the first wiring hole 51 and the fourth wiring hole 54 are distributed on opposite sides of the center of the stator core; the coil is wound around the first stator core 22 to form a first control winding 23, and passes through the first wiring hole 51 and the second winding hole in sequence, and is wound around the second stator core 32 to form a second control winding 33, and passes through the third wiring hole 53 and the fourth wiring hole 54 in sequence; wherein the input side and the output side of the coil are located on the same side of the first stator assembly 20.

[0045] Specifically, the first stator core 22 defines a first wiring hole 51 and a fourth wiring hole 54, symmetrically distributed about the center of the circle. The second stator core 32 also defines a second wiring hole 52 and a third wiring hole 53, correspondingly aligned with the wiring holes of the first stator core 22. The wiring holes have smooth inner walls and rounded edges to prevent scratching the coil insulation.

[0046] See also Figure 2 The wiring path is as follows: the coil enters from the left side of the first stator core 22, winds the first control winding 23, then passes through the first wiring hole 51, then the second wiring hole 52 (spanning the air gap of the permanent magnet 10), winds the second control winding 33, then passes through the third wiring hole 53, then the fourth wiring hole 54, and finally exits from the same side of the first stator assembly 20 as the wiring entry side. The symmetrical wiring hole design enables "U"-shaped coil winding, shortening the span and reducing magnetic field hysteresis. The centralized wiring solution reduces the number of external connectors from 16 to 4, further reducing wiring complexity and cost, and improving assembly efficiency.

[0047] The present invention also proposes a motor, which includes the aforementioned magnetic bearing assembly. The specific structure of the magnetic bearing assembly refers to the above-mentioned embodiment. Since this motor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0048] The present invention further provides a compressor comprising the aforementioned magnetic bearing assembly. The specific structure of the magnetic bearing assembly is similar to that of the aforementioned embodiments. Since the present compressor utilizes all the technical solutions of all the aforementioned embodiments, it at least possesses all the beneficial effects brought about by the technical solutions of the aforementioned embodiments, and therefore, no further details are given here.

[0049] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformation made by using the contents of the present invention description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the scope of protection of the present invention.

Claims

1. A magnetic bearing assembly, characterized in that: include: permanent magnet; A first stator assembly is provided on one side of the permanent magnet; a second stator assembly, disposed on the other side of the permanent magnet; as well as The rotor assembly includes a rotating shaft, and a first rotor core, a second rotor core and a middle partition plate that are sleeved on the rotating shaft. The first rotor core is arranged corresponding to the first stator assembly, the second rotor core is arranged corresponding to the second stator assembly, and the middle partition plate is arranged between the first rotor core and the second rotor core.

2. The magnetic bearing assembly according to claim 1, wherein: The rotor assembly further includes a first baffle and a second baffle. The first baffle is disposed on a side of the first rotor core away from the middle diaphragm, and the second baffle is disposed on a side of the second rotor core away from the middle diaphragm.

3. The magnetic bearing assembly according to claim 2, wherein: The rotor assembly further includes a support ring sleeve, and the first baffle, the first rotor core, the middle partition, the second rotor core and the second baffle are sleeved on the outer circumference of the support ring sleeve.

4. The magnetic bearing assembly according to claim 3, wherein: The end surfaces of both ends of the support ring sleeve are flush with the end surfaces of the first baffle and the second baffle.

5. The magnetic bearing assembly according to claim 3, wherein: The first stator assembly includes a first radial magnetic conductive ring and a first stator core, and the first stator core is installed on the first radial magnetic conductive ring; the second stator assembly includes a second radial magnetic conductive ring and a second stator core, and the second stator core is installed on the second radial magnetic conductive ring; wherein, along the axial direction of the rotor assembly, the width of the first rotor core is not less than the width of the first stator core, and the width of the second rotor core is not less than the width of the second stator core.

6. The magnetic bearing assembly according to claim 5, wherein: The first stator assembly further includes a first control winding, which is wound around the first stator core; the second stator assembly further includes a second control winding, which is wound around the second stator core; wherein the first control winding and the second control winding are formed by winding one coil.

7. The magnetic bearing assembly according to claim 6, wherein: The first stator core is provided with a first wiring hole and a fourth wiring hole, and the second stator core is provided with a second wiring hole and a third wiring hole; in the axial direction of the stator core, the first wiring hole and the second wiring hole are correspondingly arranged, and the third wiring hole and the fourth wiring hole are correspondingly arranged. The first wiring hole, the second wiring hole, the third wiring hole and the fourth wiring hole are used for routing coils to form the first control winding and the second control winding.

8. The magnetic bearing assembly according to claim 7, wherein: The first wiring hole and the fourth wiring hole are distributed on opposite sides of the center of the stator core; the coil is wound around the first stator core to form the first control winding, and passes through the first wiring hole and the second winding hole in sequence, and is wound around the second stator core to form the second control winding, and passes through the third wiring hole and the fourth wiring hole in sequence to exit; wherein the input side and the output side of the coil are located on the same side of the first stator assembly.

9. A motor, characterized in that: Comprising the magnetic bearing assembly according to any one of claims 1 to 8.

10. A compressor, characterized in that: Comprising the magnetic bearing assembly according to any one of claims 1 to 8.

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