Magnetic suspension active three-degree-of-freedom bearings, compressors, motors

Abstract

The present invention provides a magnetic suspension active three-degree-of-freedom bearing, a compressor, and a motor, wherein the magnetic suspension active three-degree-of-freedom bearing comprises a bearing rotor, a radial stator assembly, and two axial stator assemblies, wherein the radial stator assembly comprises a radial stator, and the radial stator has 12 poles, the 12 poles are centrally symmetrical about the center of the rotating shaft and are distributed in 4 quadrants, each quadrant has a middle pole and a first side pole and a second side pole on both sides of the middle pole, the first side pole and the second side pole are symmetrical about the middle pole, and the symmetry line of the middle pole coincides with the angular bisector of the corresponding quadrant, and the polarity formed by the first side pole and the second side pole is the same and opposite to the polarity formed by the middle pole. The present invention does not need to assemble a thrust plate separately on the rotating shaft, the structure is more compact, the process is simplified, the bearing volume is effectively reduced, the rotating shaft length is shortened, the critical speed of the rotor is increased, and the operation stability of the magnetic suspension system is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of magnetic suspension bearings, and in particular relates to a magnetic suspension active three-degree-of-freedom bearing, a compressor, and a motor. Background Art

[0002] Magnetic bearings (abbreviated as magnetic bearings) use the electromagnetic force on the rotor to suspend the rotating shaft, and the rotating shaft and stator remain in a non-contact state, so they have the advantages of no wear, high speed, high precision, and long life. Magnetic bearings can be divided into three categories according to their working principles: active magnetic bearings, passive magnetic bearings, and hybrid magnetic bearings. Magnetic bearings are further divided into radial magnetic bearings and axial magnetic bearings. The radial magnetic bearings adjust the radial position of the rotating shaft through the electromagnetic force between the radial rotor and the radial rotor, and the axial magnetic bearings adjust the axial position of the rotating shaft through the electromagnetic force between the thrust plate on the rotating shaft. In a magnetic suspension system, radial magnetic bearings and axial magnetic bearings are configured at both ends of the rotating shaft, thereby adjusting the three-degree-of-freedom direction position of the rotating shaft. However, the radial magnetic bearing and the axial magnetic bearing that are independently arranged have a low degree of integration and occupy the size of the rotating shaft, thereby causing the rotating shaft length to be relatively large, which is not conducive to the improvement of the critical speed of the rotor. Of course, in some existing technologies, there are also three-degree-of-freedom magnetic bearings that integrate the radial magnetic bearing and the axial magnetic bearing into a whole. However, the structural design of the radial bearing and the axial bearing in this three-degree-of-freedom magnetic bearing is not reasonable enough, resulting in the magnetic lines of force of the radial bearing and the magnetic lines of force of the axial bearing each forming a passage through the corresponding rotor parts such as the radial rotor or the thrust plate. The overall structure is complex, the processing and manufacturing process is complex, the assembly is difficult, and the degree of integration is relatively low. Summary of the invention

[0003] Therefore, the present invention provides a magnetically suspended active three-degree-of-freedom bearing, a compressor, and a motor, which can solve the technical problems that the structural design of the radial bearing and the axial bearing in the three-degree-of-freedom magnetic bearing in the prior art is not reasonable, resulting in the magnetic lines of force of the radial bearing and the magnetic lines of force of the axial bearing each forming a passage through the corresponding rotor parts, the overall structure is complex, the processing and manufacturing process is complex, the assembly is difficult, and the degree of integration is low.

[0004] In order to solve the above problems, the present invention provides a magnetically suspended active three-degree-of-freedom bearing, comprising a bearing rotor for fixed sleeve connection with a rotating shaft, a radial stator assembly sleeved on the radial outer side of the bearing rotor, and a first axial stator assembly and a second axial stator assembly at both axial ends of the bearing rotor, wherein the first axial stator assembly and the second axial stator assembly respectively form an axial magnetic circuit with the bearing rotor and the radial stator assembly to adjust the axial position of the bearing rotor, and a radial magnetic circuit is formed between the radial stator assembly and the bearing rotor to adjust the radial position of the bearing rotor, and the radial stator assembly comprises a radial stator, and the radial stator has 12 poles extending toward one side of the bearing rotor, and in the axial projection of the rotating shaft, the 12 poles are in a radial direction with respect to the rotating shaft. The center is centrally symmetrical and distributed in four quadrants, each of the quadrants has a middle pole and a first side pole and a second side pole on both sides of the middle pole, the first side pole and the second side pole are symmetrical about the middle pole and the symmetry line of the middle pole coincides with the angular bisector of the corresponding quadrant, the polarity formed by the first side pole is the same as the polarity formed by the second side pole and is opposite to the polarity formed by the middle pole, the first axial stator assembly and the second axial stator assembly both have four axial poles arranged at intervals around the rotating shaft, each of the axial poles is wound with an axial coil, each of the axial poles is arranged one-to-one corresponding to the central pole in each quadrant, or each of the axial poles is arranged corresponding to the first side pole and the second side pole adjacent to each other in two adjacent quadrants.

[0005] In some embodiments, a circumferential width of the middle pole is greater than a circumferential width of the first side pole or the second side pole.

[0006] In some embodiments, a circumferential width of the middle pole is twice a circumferential width of the first side pole or the second side pole.

[0007] In some embodiments, a radial coil is wound around each of the poles, and the radial coil wound around the first-side pole is connected in series with the radial coil wound around the second-side pole.

[0008] In some embodiments, the first axial stator assembly includes a first axial stator, the first axial stator having a first inner magnetic ring and a first axial pole, the axial coil is respectively wound around each of the first axial poles, wherein a first axial inner working gap is formed between the first inner magnetic ring and the left end surface of the bearing rotor, a first axial outer working gap is formed between the first axial pole and the left end surface of the radial stator, and the first axial pole is located radially inside the radial coil.

[0009] In some embodiments, the second axial stator assembly includes a second axial stator, the second axial stator has a second inner magnetic ring and a second axial pole, the axial coil is respectively wound around each of the second axial poles, wherein a second axial inner working gap is formed between the second inner magnetic ring and the right end face of the bearing rotor, a second axial outer working gap is formed between the second axial pole and the right end face of the radial stator, and the second axial pole is located radially inside the radial coil.

[0010] In some embodiments, the radial coils wound on the middle poles in each quadrant are controlled independently of the radial coils wound on the first side poles and the second side poles.

[0011] In some embodiments, the current flowing through the axial coils in the first axial stator assembly is opposite to the current flowing through the axial coils in the second axial stator assembly.

[0012] The present invention also provides a compressor, comprising the above-mentioned magnetic suspension active three-degree-of-freedom bearing.

[0013] The present invention also provides a motor, comprising the above-mentioned magnetic suspension active three-degree-of-freedom bearing.

[0014] The present invention provides a magnetic levitation active three-degree-of-freedom bearing, compressor, and motor. No thrust plate needs to be assembled separately on the rotating shaft, and the overall structure and processing technology are simplified, which is easy to assemble. The degree of integration is high, the structure is more compact, and the volume of the bearing is effectively reduced, the length of the rotating shaft is shortened, the critical speed of the rotor is increased, and the operating stability of the magnetic levitation system is improved. The axial magnetic circuit generated by the axial coil is in the pole. The part with the same or opposite direction as the radial magnetic circuit in the corresponding pole ensures that the direction of the radial force resultant of the radial stator assembly on the bearing rotor in the quadrant is on the angular bisector of the quadrant. The radial force resultant determined by this direction is obviously conducive to the adjustment of the radial position of the bearing rotor, and the control is simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the internal structure of a magnetically suspended active three-degree-of-freedom bearing according to an embodiment of the present invention, wherein the dotted arrows in the figure indicate the flow direction of the axial magnetic circuit;

[0016] Figure 2 for Figure 1 The relative position relationship between the radial stator and the bearing rotor in the figure, the dotted arrow in the figure shows the flow direction of the axial magnetic circuit, and the solid arrow in the figure shows the flow direction of the radial magnetic circuit;

[0017] Figure 3 for Figure 1A schematic diagram of the three-dimensional structure of the first axial stator assembly or the second axial stator assembly.

[0018] The reference numerals are as follows:

[0019] 1. Bearing rotor; 10. Rotating shaft; 21. Radial stator; 211. Intermediate pole; 212. First side pole; 213. Second side pole; 214. Stator yoke; 31. First axial stator; 311. First inner magnetic ring; 312. First axial pole; 41. Second axial stator; 411. Second inner magnetic ring; 412. Second axial pole; 51. Axial coil; 52. Radial coil; 001. Axial magnetic circuit; 002. Radial magnetic circuit; 003. Radial working gap; 004. First axial inner working gap; 005. Second axial inner working gap. DETAILED DESCRIPTION

[0020] See also Figures 1 to 3 As shown, a magnetic suspension active three-degree-of-freedom bearing is provided, including a bearing rotor 1 for fixedly sleeved with a rotating shaft 10, a radial stator assembly sleeved on the radial outer side of the bearing rotor 1, and a first axial stator assembly and a second axial stator assembly respectively located at two axial ends of the bearing rotor 1, the first axial stator assembly and the second axial stator assembly respectively form an axial magnetic circuit 001 with the bearing rotor 1 and the radial stator assembly to adjust the axial position of the bearing rotor 1, a radial magnetic circuit 002 is formed between the radial stator assembly and the bearing rotor 1 to adjust the radial position of the bearing rotor 1, the radial stator assembly includes a radial stator 21, the radial stator 21 includes a stator yoke 214, the inner ring of the stator yoke 214 has 12 poles extending toward one side of the bearing rotor 1, and the axial portion of the rotating shaft 10 is provided with a plurality of radial stator yokes 214, wherein the radial stator yoke 214 ... In the longitudinal projection, the 12 poles are centrally symmetrical about the center of the rotating shaft 10 and are distributed in four quadrants. The three poles in each quadrant include a middle pole 211 and a first side pole 212 and a second side pole 213 located on both sides of the middle pole 211. The first side pole 212 and the second side pole 213 are symmetrical about the middle pole 211, and the symmetry line of the middle pole 211 coincides with the angular bisector of the corresponding quadrant. In each quadrant, the first side pole 212, the middle pole 211, and the second side pole 213 form an E-shaped structure. The polarity formed by the first side pole 212 and the second side pole 213 is the same and opposite to the polarity formed by the middle pole 211. The first axial stator assembly and the second axial stator assembly both have four axial poles arranged at intervals around the rotating shaft 10 (see Figure 3As shown, they are respectively arranged in four quadrants), an axial coil 51 is wound around each axial pole, and each axial pole is arranged one-to-one corresponding to the central pole 211 in each quadrant, or, each axial pole is arranged corresponding to the first side pole 212 and the second side pole 213 adjacent to each other in two adjacent quadrants. It can be understood that the aforementioned four quadrants specifically refer to the center of the rotating shaft 10 as the coordinate origin O, and an orthogonal coordinate system XOY is established through the point O, and the orthogonal coordinate system XOY divides the aforementioned axial projection into four adjacent quadrants. This aspect is basic geometric knowledge and will not be elaborated on. In this technical solution, the bearing rotor serves as a conducting component of the axial magnetic circuit 001 and the radial magnetic circuit 002 at the same time, and the thrust plate and the bearing rotor in the prior art are integrated into one, the integration degree of the bearing is further improved, and there is no need to assemble the thrust plate separately on the rotating shaft 10. The overall structure and processing technology are simplified, which is convenient for assembly, has a high degree of integration, and a more compact structure, which effectively reduces the volume of the bearing, shortens the length of the rotating shaft, increases the critical speed of the rotor, and improves the operating stability of the magnetic suspension system; more importantly, the polarity of the poles on both sides of the three poles in each quadrant is the same as The polarity of the middle pole is opposite and the structure is symmetrical about the symmetry line of the middle pole 211, and the symmetry line coincides with the angular bisector of the quadrant, so that the axial magnetic circuit 001 generated by the axial coil 51 is located in the pole part and the radial magnetic circuit 002 in the corresponding pole is in the same or opposite direction, which ensures that the direction of the radial force resultant of the radial stator assembly in the quadrant on the bearing rotor 1 is on the angular bisector of the quadrant. This direction-determined radial force resultant is obviously conducive to the adjustment of the radial position of the bearing rotor 1, and the control is simplified, especially the control of the radial magnetic circuit 002 is more convenient. It should be particularly noted that the axial stator in the present invention adopts the pole method of spaced poles, which can enhance the magnetic flux at the radial working gap 003 corresponding to the corresponding central pole 211 or the first side pole 212 and the second side pole 213. In addition, compared with the full-circle axial bearing outer ring, the four axial poles arranged at intervals in the axial stator assembly can prevent the radial magnetic flux from forming a loop through the axial bearing outer ring, thereby preventing the radial magnetic flux from not flowing into the radial bearing rotor, and thereby preventing the radial magnetic flux from not forming radial attraction. The radial magnetic flux that does not contribute to the radial attraction is defined as "leakage flux", so setting the axial poles here can avoid the "leakage flux" phenomenon.

[0021] Specific combination Figure 2As shown, the aforementioned four quadrants are respectively the first quadrant on the upper right, the second quadrant on the upper left, the third quadrant on the lower left, and the fourth quadrant on the lower right. Taking the three poles in the first quadrant as an example, the energizing direction of each radial coil 52 shown in the figure is used as the standard, wherein the free end of the middle pole 211 presents an S pole, the free end of the first side pole 212 presents an N pole, and the second side pole 213 presents an N pole. In the first side pole 212 and the second side pole 213, the flow direction of the radial magnetic circuit 002 is opposite to the flow direction of the axial magnetic circuit 001. Similarly, in this way, the magnetic flux between the first side pole 212 and the second side pole 213 and the bearing rotor 1 can be increased, thereby increasing the radial force at the two locations, and no axial magnetic circuit 001 flows through the middle pole 211. Due to the symmetric relationship between the middle pole 211, the first side pole 212 and the second side pole 213 and the coincidence characteristics with the diagonal line of the quadrant, no matter whether the current of the axial coils 51 on the left and right sides increases or decreases, the direction of the resultant radial force on the bearing rotor 1 in the quadrant is the diagonal line of the quadrant, that is, coincidence with the diagonal line of the quadrant. Figure 2 The horizontal direction of the direction shown is 45°, and this direction does not change with the magnitude and direction of the current of the axial coils 51 on the left and right sides, thereby greatly reducing the control difficulty of the magnetic bearing. It can be understood that for some magnetic suspension bearings, the poles in the first quadrant lack the setting of the present invention, so that when the magnitude or direction of the current in the corresponding axial coil 51 changes based on the adjustment of the axial displacement, the angle between the direction of the resultant radial force in the first quadrant and the horizontal direction changes, and this change, that is, the uncertainty of the direction of the resultant radial force, will increase the difficulty of controlling the magnetic bearing. It should be noted that the above content is aimed at the influence of the axial magnetic flux on the poles in one quadrant, and the enhancement of the radial magnetic flux in the four quadrants of the axial magnetic flux offsets each other, that is, although the radial magnetic circuit and the axial magnetic circuit of the integrated magnetic bearing both flow through the bearing rotor 1, the change of the axial magnetic circuit will not affect the radial magnetic circuit as a whole, which simplifies the control of the magnetic bearing.

[0022] In some embodiments, the circumferential width of the middle pole 211 is greater than the circumferential width of the first side pole 212 or the second side pole 213, see Figure 2As shown, the middle pole 211 simultaneously serves as a flow component for the magnetic lines of force in the first side pole 212 and the second side pole 213. The circumferential width of the middle pole 211 is designed to be larger than the circumferential width of the two adjacent poles, so that the magnetic circuits on both sides can be optimized. In a preferred embodiment, the circumferential width of the middle pole 211 is twice the circumferential width of the first side pole 212 or the second side pole 213. In this way, the magnetic pole area of ​​the middle pole 211 is twice that of the two end poles, i.e., the first side pole 212 and the second side pole 213. At the same time, the middle pole 211 is connected in series with the first side pole 212 or the second side pole 213 to ensure that the radial control turns and the radial current are consistent, so that only one current needs to be adjusted to control the radial movement. This control method is simple, ensuring that the radial magnetic flux of the middle pole 211 is twice that of the two ends, the radial magnetic flux density on the three poles is consistent, and the magnetic circuit is not easy to saturate.

[0023] A radial coil 52 is wound around each pole. The radial coil 52 wound around the first pole 212 and the radial coil 52 wound around the second pole 213 are connected in series. Figure 2 As shown, the current flow direction of the radial coil 52 corresponding to the first side pole 212 and the second side pole 213 is left-in and right-out, while the current flow direction of the radial coil 52 corresponding to the middle pole 211 is right-in and left-out, thereby realizing that the clockwise magnetic poles of the three poles in the first quadrant are NSN respectively. Of course, the current flow direction can be exactly the opposite so that the clockwise magnetic poles of the three poles in the first quadrant are SNS respectively. It should be noted that the polarity of the poles in other quadrants should meet the requirement of symmetry about the center of the rotating shaft 10. In this technical solution, by connecting the radial coils 52 of the first side pole 212 and the second side pole 213 in series, the magnetic forces presented by the two poles are completely consistent, thereby ensuring that the direction of the resultant radial force strictly coincides with the diagonal of the quadrant.

[0024] In some embodiments, the first axial stator assembly includes a first axial stator 31, the first axial stator 31 has a first inner magnetic ring 311 and a first axial pole 312, the axial coil 51 is located between the first inner magnetic ring 311 and the first axial pole 312, wherein a first axial inner working gap 004 is formed between the first inner magnetic ring 311 and the left end face of the bearing rotor 1, a first axial outer working gap is formed between the first axial pole 312 and the left end face of the radial stator 21, and the first axial pole 312 is located radially inside the radial coil 52. Similarly, the second axial stator assembly includes a second axial stator 41, which has a second inner magnetic ring 411 and a second axial pole 412, and the axial coil 51 is located between the second inner magnetic ring 411 and the second axial pole 412, wherein a second axial inner working gap 005 is formed between the second inner magnetic ring 411 and the right end face of the bearing rotor 1, a second axial outer working gap is formed between the second axial pole 412 and the right end face of the radial stator 21, and the second axial pole 412 is located radially inside the radial coil 52. In this technical solution, the first axial pole 312 or the second axial pole 412 is arranged corresponding to the pole position of the radial stator 21 and is located inside the radial coil 52, but is not arranged corresponding to the stator yoke 214 of the radial stator 21, which can reduce the leakage magnetic flux of the radial magnetic circuit 002 in the axial direction and prevent the occurrence of circumferential unevenness of the axial output.

[0025] In some embodiments, the control of the radial coil 52 wound on the middle pole 211 in each quadrant is independent of the control of the radial coil 52 wound on the first side pole 212 and the second side pole 213. Figure 2 As shown, the radial stator assembly has 12 magnetic poles (specifically, the aforementioned poles), which are four symmetrically distributed E-shaped structures, with small teeth at both ends (i.e., the aforementioned first side pole 212 and the second side pole 213, the same below), and large teeth in the middle (i.e., the aforementioned middle pole 211, the same below), and the radial coils 52 on the small teeth at both ends are connected in series. Each E-shaped structure magnetic pole is NSN (or SNS) distributed in space, and the radial magnetic circuit 002 is as shown in FIG. Figure 2 As shown by the solid line, the axial magnetic circuit 001 is as follows Figure 2 As shown by the dotted lines, all of them point to the center of the circle, and the magnetic field in the small tooth air gap at both ends of the E-shaped structure is enhanced. When the bearing rotor 1 needs to be controlled to move to the upper left, the radial coil 52 in the upper left (that is, in the second quadrant) is energized to provide the bearing rotor 1 with a radial force to the upper left; when the bearing rotor 1 needs to be controlled to move upward, the radial coils 52 in the upper left and upper right (that is, in the first quadrant) are energized to provide the bearing rotor 1 with an upward radial force. This control has a wide range of radial movement directions and flexible control.

[0026] In some embodiments, the current flowing through the axial coil 51 in the first axial stator assembly is opposite to the current flowing through the axial coil 51 in the second axial stator assembly to ensure that the radial magnetic circuit 001 generated by the axial stator assemblies at both ends has an enhanced effect on the radial magnetic circuit 002 (i.e., a positive effect), thereby facilitating the control of the bearing rotor 1 to adjust the axial position of the bearing rotor 1.

[0027] Axial magnetic circuit 001 can be found in detail Figure 1 As shown, the axial pole of the axial stator is located at the lower end of the radial coil 52 ( Figure 1 The axial magnetic circuit 001 generated by the axial coil 51 includes a first axial magnetic circuit and a second axial magnetic circuit, which are used to control the axial movement of the bearing rotor. The first axial magnetic circuit passes through the first axial pole 312-pole-radial working gap 003-bearing rotor 1-first axial inner working gap 004-first inner magnetic ring 311 back to the first axial stator 31 and closes in the clockwise direction. The second axial magnetic circuit passes through the second axial pole 412-pole-radial working gap 003-bearing rotor 1-second axial inner working gap 005-the second inner magnetic ring 411 returns to the second axial stator 41 and closes counterclockwise. When the bearing rotor 1 needs to be controlled to move to the left, the current of the left bearing winding (that is, the left axial coil 51) is increased, and the bearing rotor 1 is subjected to a large force to the left. Conversely, when the bearing rotor 1 needs to be controlled to move to the right, the current of the right bearing winding (that is, the right axial coil 51) is increased, and the bearing rotor 1 is subjected to a large force to the right. Therefore, the axial movement of the bearing rotor 1 is controlled by controlling the current of the left second axial winding.

[0028] It should be particularly noted that the bearing of the present invention is an active electromagnetic bearing and does not have a permanent magnet to provide a bias magnetic field, so that the bearing of the present invention has the advantages of low cost, easy assembly, large bearing capacity, and high-power operation.

[0029] According to an embodiment of the present invention, there is further provided a compressor, comprising the above-mentioned magnetically suspended active three-degree-of-freedom bearing.

[0030] According to an embodiment of the present invention, there is further provided a motor, comprising the above-mentioned magnetically suspended active three-degree-of-freedom bearing.

[0031] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0032] The above are only 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 in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A magnetically suspended active three-degree-of-freedom bearing, characterized in that: The invention comprises a bearing rotor (1) for fixedly sleeved with a rotating shaft (10), a radial stator assembly sleeved on the radial outer side of the bearing rotor (1), and a first axial stator assembly and a second axial stator assembly respectively located at two axial ends of the bearing rotor (1), wherein the first axial stator assembly and the second axial stator assembly respectively form an axial magnetic circuit (001) with the bearing rotor (1) and the radial stator assembly to adjust the axial position of the bearing rotor (1), and a radial magnetic circuit (002) is formed between the radial stator assembly and the bearing rotor (1) to adjust the radial position of the bearing rotor (1), and the radial stator assembly comprises a radial stator (21), wherein the radial stator (21) has 12 poles extending toward one side of the bearing rotor (1), and in the axial projection of the rotating shaft (10), the 12 poles are centrally symmetrical about the center of the rotating shaft (10) and distributed in four quadrants, and each quadrant has A middle pole (211) and a first side pole (212) and a second side pole (213) located on both sides of the middle pole (211); the first side pole (212) and the second side pole (213) are symmetrical about the middle pole (211) and the symmetry line of the middle pole (211) coincides with the angular bisector of the corresponding quadrant; the polarity formed by the first side pole (212) and the second side pole (213) is the same and opposite to the polarity formed by the middle pole (211); the first axial stator assembly and the second axial stator assembly both have four axial poles arranged at intervals around the rotating shaft (10); an axial coil (51) is wound around each axial pole; each axial pole is arranged one-to-one corresponding to the central pole (211) in each quadrant, or each axial pole is arranged corresponding to the first side pole (212) and the second side pole (213) adjacent to each other in two adjacent quadrants.

2. The magnetically suspended active three-degree-of-freedom bearing according to claim 1, characterized in that: The circumferential width of the middle pole (211) is greater than the circumferential width of the first side pole (212) or the second side pole (213).

3. The magnetically suspended active three-degree-of-freedom bearing according to claim 2, characterized in that: The circumferential width of the middle pole (211) is twice the circumferential width of the first side pole (212) or the second side pole (213).

4. The magnetically suspended active three-degree-of-freedom bearing according to any one of claims 1 to 3, characterized in that: A radial coil (52) is wound around each pole, and the radial coil (52) wound around the first side pole (212) and the radial coil (52) wound around the second side pole (213) are connected in series.

5. The magnetically suspended active three-degree-of-freedom bearing according to claim 4, characterized in that: The first axial stator assembly comprises a first axial stator (31), the first axial stator (31) having a first inner magnetic ring (311) and a first axial pole (312), the axial coil (51) being respectively wound around each of the first axial poles (312), wherein a first axial inner working gap (004) is formed between the first inner magnetic ring (311) and the left end face of the bearing rotor (1), a first axial outer working gap is formed between the first axial pole (312) and the left end face of the radial stator (21), and the first axial pole (312) is located radially inside the radial coil (52).

6. The magnetically suspended active three-degree-of-freedom bearing according to claim 4, characterized in that: The second axial stator assembly comprises a second axial stator (41), the second axial stator (41) having a second inner magnetic ring (411) and a second axial pole (412), the axial coil (51) being respectively wound around each of the second axial poles (412), wherein a second axial inner working gap (005) is formed between the second inner magnetic ring (411) and the right end face of the bearing rotor (1), a second axial outer working gap is formed between the second axial pole (412) and the right end face of the radial stator (21), and the second axial pole (412) is located radially inside the radial coil (52).

7. The magnetically suspended active three-degree-of-freedom bearing according to claim 4, characterized in that: The control of the radial coil (52) wound on the middle pole (211) in each quadrant is independent of the control of the radial coil (52) wound on the first side pole (212) and the second side pole (213).

8. The magnetically suspended active three-degree-of-freedom bearing according to claim 1, characterized in that: The current flowing through the axial coil (51) in the first axial stator component is opposite to the current flowing through the axial coil (51) in the second axial stator component.

9. A compressor, characterized in that: A magnetically suspended active three-degree-of-freedom bearing comprising any one of claims 1 to 8.

10. A motor, characterized in that: A magnetically suspended active three-degree-of-freedom bearing comprising any one of claims 1 to 8.

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