Magnetic levitation active three-degree-of-freedom bearing, motor, compressor

Abstract

The present invention provides a magnetic levitation active three-degree-of-freedom bearing, a motor, and a compressor. The magnetic levitation active three-degree-of-freedom bearing includes: a bearing rotor fixedly sleeved on the outer peripheral wall of a rotating shaft, a radial stator sleeved outside the bearing rotor, a first axial stator and a second axial stator respectively sleeved outside the rotating shaft, and the first axial stator and the second axial stator are respectively and simultaneously located on both sides of the bearing rotor and the radial stator. According to the present invention, by removing the thrust disc of the magnetic levitation bearing, the electromagnetic force between the radial stator and the bearing rotor is used to adjust the radial position of the rotating shaft, and the electromagnetic force between the first axial stator and the second axial stator and the bearing rotor is used to adjust the axial position of the rotating shaft, thereby realizing the three-degree-of-freedom adjustment of the rotating shaft. The omission of the thrust disc enables the radial magnetic levitation bearing and the axial magnetic levitation bearing to have high integration, a compact structure, easy assembly, and a significantly reduced bearing size.

Description

Technical Field

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

[0002] Magnetic levitation bearings use electromagnetic forces on the rotor to levitate the rotating shaft, and the rotating shaft and the stator remain in a non-contact state. Therefore, they have the advantages of no wear, high rotational speed, high precision, and long service life. Magnetic levitation bearings are abbreviated as magnetic bearings. Magnetic bearings can be classified into three categories according to their working principles: active magnetic bearings, passive magnetic bearings, and hybrid magnetic bearings. Magnetic bearings include radial magnetic levitation bearings and axial magnetic levitation bearings. The radial magnetic levitation bearing adjusts the position of the rotating shaft in the radial direction through the electromagnetic force between it and the bearing rotor fixedly sleeved on the rotating shaft, and the axial magnetic levitation bearing adjusts the position of the rotating shaft in the axial direction through the electromagnetic force between it and the thrust disk fixedly sleeved on the rotating shaft, so as to realize the three-degree-of-freedom adjustment of the rotating shaft. In the prior art, due to the existence of the thrust disk, the integration degree of the radial magnetic levitation bearing and the axial magnetic levitation bearing is not high, and the finally formed magnetic bearing has a complex structure, difficult assembly, and large size. Summary of the Invention

[0003] Therefore, the present invention provides a magnetic levitation active three-degree-of-freedom bearing, which can overcome the deficiencies of the existing magnetic bearings, such as complex structure, difficult assembly, and large size.

[0004] To solve the above problems, the present invention provides a magnetic levitation active three-degree-of-freedom bearing, comprising: a rotating shaft, a bearing rotor, a radial stator, a first axial stator, and a second axial stator. The bearing rotor is fixedly sleeved on the outer peripheral wall of the rotating shaft. The radial stator is sleeved outside the bearing rotor, and there is a radial working gap between the radial stator and the bearing rotor. The first axial stator and the second axial stator are respectively sleeved outside the rotating shaft, and the first axial stator and the second axial stator are respectively located on both sides of the bearing rotor and the radial stator at the same time. The radial stator includes four pole column units separated by four quadrants. Each pole column unit has a first pole column facing the inner side of the radial stator and two second pole columns. Along the circumferential direction of the radial stator, the two second pole columns are respectively located on both sides of the first pole column and are symmetric with respect to the first pole column. A first radial winding is wound on the first pole column, and a second radial winding is wound on the second pole column. The first axial stator includes a first outer magnetic pole block and a first inner magnetic pole ring. A first axial winding is arranged between the first outer magnetic pole block and the first inner magnetic pole ring, and there is a first axial working gap between the first inner magnetic pole ring and the bearing rotor. The second axial stator includes a second outer magnetic pole block and a second inner magnetic pole ring. A second axial winding is arranged between the second outer magnetic pole block and the second inner magnetic pole ring, and there is a second axial working gap between the second inner magnetic pole ring and the bearing rotor.

[0005] In some embodiments, the number of the first outer magnetic pole blocks is four, and the four first outer magnetic pole blocks are circumferentially spaced apart along the first axial stator.

[0006] In some embodiments, the number of the second outer magnetic pole blocks is four, and the four second outer magnetic pole blocks are circumferentially spaced apart along the second axial stator.

[0007] In some embodiments, the four first outer magnetic pole blocks respectively correspond to the positions of the four first pole columns. Adjacent two second pole columns form a combination, and the four second outer magnetic pole blocks respectively correspond to the positions of the four combinations.

[0008] In some embodiments, after the first radial winding and the second radial winding are both energized, a radial control magnetic circuit is generated. After the first axial winding is energized, a first axial control magnetic circuit is generated. The direction of the magnetic force lines of the first axial control magnetic circuit in the first pole column is the same as the direction of the magnetic force lines of the radial control magnetic circuit in the first pole column.

[0009] In some embodiments, the first axial control magnetic circuit is closed back to the first axial stator through the first inner magnetic pole ring - the first axial working gap - the bearing rotor - the radial working gap - the first pole column - the first outer magnetic pole block; the radial control magnetic circuit is closed to the radial stator through the first pole column - the radial working gap - the bearing rotor - the radial working gap - the second pole column.

[0010] In some embodiments, after the second axial winding is energized, a second axial control magnetic circuit is generated, and the direction of the magnetic lines of force of the second axial control magnetic circuit in the second pole column is the same as the direction of the magnetic lines of force of the radial control magnetic circuit in the second pole column.

[0011] In some embodiments, the second axial control magnetic circuit is closed back to the second axial stator through the second outer magnetic pole block - the second pole column - the radial working gap - the bearing rotor - the second axial working gap - the second inner magnetic pole ring; the radial control magnetic circuit is closed to the radial stator through the first pole column - the radial working gap - the bearing rotor - the radial working gap - the second pole column.

[0012] In some embodiments, within the same pole column unit, the two second radial windings are connected in series.

[0013] In some embodiments, along the circumferential direction of the radial stator, the width of the first pole column is greater than the width of the second pole column.

[0014] In some embodiments, along the radial direction of the radial stator, both the first radial winding and the second radial winding are located radially outside the first outer magnetic pole block and the second outer magnetic pole block.

[0015] The present invention also provides a motor, including the above-mentioned magnetic levitation active three-degree-of-freedom bearing.

[0016] The present invention also provides a compressor, including the above-mentioned magnetic levitation active three-degree-of-freedom bearing.

[0017] The present invention provides a magnetic levitation active three-degree-of-freedom bearing, a motor, and a compressor. By removing the thrust disk and using the electromagnetic force between the radial stator and the bearing rotor to adjust the radial position of the rotating shaft, and using the electromagnetic force between the first axial stator and the second axial stator and the bearing rotor to adjust the axial position of the rotating shaft, three-degree-of-freedom adjustment of the rotating shaft is achieved, that is, the position of the rotating shaft in the three directions of X, Y, and Z can be freely adjusted. When the magnetic bearing of the present application realizes three-degree-of-freedom adjustment of the rotating shaft, the thrust disk is omitted, making the integration of the radial magnetic levitation bearing and the axial magnetic levitation bearing high, the structure compact, the assembly easy, and the bearing size significantly reduced. Description of the Drawings

[0018] Figure 1 Schematic diagram of the structure of the radial stator of the magnetic levitation active three-degree-of-freedom bearing according to an embodiment of the present invention;

[0019] Figure 2 is Figure 1 Cross-sectional view of the A-A plane of the radial stator of the magnetic levitation active three-degree-of-freedom shaft according to an embodiment of the present invention;

[0020] Figure 3 is Figure 1 Cross-sectional view of the B-B plane of the radial stator of the magnetic levitation active three-degree-of-freedom shaft according to an embodiment of the present invention;

[0021] Figure 4 Front view of the first axial stator of the magnetic levitation active three-degree-of-freedom bearing according to an embodiment of the present invention;

[0022] Figure 5 Front view of the second axial stator of the magnetic levitation active three-degree-of-freedom bearing according to an embodiment of the present invention;

[0023] Figure 6 Schematic diagram of the structure of the first axial stator of the magnetic levitation active three-degree-of-freedom bearing according to an embodiment of the present invention.

[0024] The reference numerals are represented as:

[0025] 1, rotating shaft; 2, bearing rotor; 3, radial stator; 31, first pole column; 32, second pole column; 33, first radial winding; 34, second radial winding; 4, first axial stator; 41, first outer magnetic pole block; 42, first inner magnetic pole ring; 43, first axial winding; 5, second axial stator; 51, second outer magnetic pole block; 52, second inner magnetic pole ring; 53, second axial winding; 6, radial working gap; 7, first axial working gap; 8, second axial working gap; 9, radial control magnetic circuit; 10, first axial control magnetic circuit; 11, second axial control magnetic circuit. Detailed implementation manners

[0026] Refer to in combination Figures 1 to 6As shown, according to an embodiment of the present invention, a magnetic levitation active three-degree-of-freedom bearing is provided, including: a rotating shaft 1, a bearing rotor 2, a radial stator 3, a first axial stator 4, and a second axial stator 5. The bearing rotor 2 is fixedly sleeved on the outer peripheral wall of the rotating shaft 1. The radial stator 3 is sleeved outside the bearing rotor 2, and there is a radial working gap 6 between the radial stator 3 and the bearing rotor 2. The first axial stator 4 and the second axial stator 5 are respectively sleeved outside the rotating shaft 1, and the first axial stator 4 and the second axial stator 5 are respectively located on both sides of the bearing rotor 2 and the radial stator 3 at the same time. The radial stator 3 includes four pole column units separated by four quadrants. The pole column unit has a first pole column 31 facing the inside of the radial stator 3 and two second pole columns 32. Along the circumferential direction of the radial stator 3, the two second pole columns 32 are respectively located on both sides of the first pole column 31 and are symmetric with respect to the first pole column 31. A first radial winding 33 is wound on the first pole column 31, and a second radial winding 34 is wound on the second pole column 32. The first axial stator 4 includes a first outer magnetic pole block 41 and a first inner magnetic pole ring 42. A first axial winding 43 is provided between the first outer magnetic pole block 41 and the first inner magnetic pole ring 42, and there is a first axial working gap 7 between the first inner magnetic pole ring 42 and the bearing rotor 2. The second axial stator 5 includes a second outer magnetic pole block 51 and a second inner magnetic pole ring 52. A second axial winding 53 is provided between the second outer magnetic pole block 51 and the second inner magnetic pole ring 52, and there is a second axial working gap 8 between the second inner magnetic pole ring 52 and the bearing rotor 2. In this technical solution, by removing the thrust disc, the electromagnetic force between the radial stator 3 and the bearing rotor 2 is used to adjust the radial position of the rotating shaft 1, and the electromagnetic force between the first axial stator 4 and the second axial stator 5 and the bearing rotor 2 is used to adjust the axial position of the rotating shaft 1, thereby realizing the three-degree-of-freedom adjustment of the rotating shaft 1, that is, the position of the rotating shaft 1 in the XYZ three directions can be freely adjusted. When the magnetic levitation active three-degree-of-freedom bearing of the present application realizes the three-degree-of-freedom adjustment of the rotating shaft 1, the thrust disc is omitted, so that the integration of the radial magnetic levitation bearing and the axial magnetic levitation bearing is high, the structure is compact, the assembly is easy, and the bearing size is significantly reduced. With these advantages, the magnetic bearing can also increase the critical speed of the bearing rotor 2 and improve the stability and applicability of the magnetic levitation system. Among them, after both the first radial winding 33 and the second radial winding 34 are energized, the combination of the bearing rotor 2 and the rotating shaft 1 is levitated by the generated electromagnetic force. When it is necessary to adjust the radial position of the rotating shaft 1, it can be realized by increasing the radial winding current in the corresponding quadrant or the corresponding combined quadrant. When it is necessary to adjust the axial position of the rotating shaft 1, it is realized by increasing the current of the first axial winding 43 of the first axial stator 4 or increasing the current of the second axial winding 53 of the second axial stator 5.According to the change of its own size, the number of pole columns of the radial stator 3 of the magnetic bearing is also different. The magnetic suspension bearing within a certain size range corresponds to the corresponding number of pole columns. Otherwise, if the number of pole columns is too small, the distance between adjacent pole columns will be too large, and if the number of pole columns is too large, the distance between adjacent pole columns will be too small and it will be difficult to wind the wire. The magnetic suspension active three-degree-of-freedom bearing of the present application corresponds to 12 pole columns according to its own size. More importantly, within the same pole column unit of the present application, the two second pole columns 32 are symmetric with respect to the first pole column 31. By passing currents with opposite directions through the first radial winding 33 and the second radial winding 34, the two second pole columns 32 and the first pole column 31 can exhibit opposite polarities. Then, within the same quadrant, the resultant electromagnetic force generated after energization is always on the center line of the first pole column 31, which is more conducive to adjusting the position of the bearing rotor 2 in the radial direction, that is, more conducive to adjusting the position of the rotating shaft 1 in the radial direction. For the left and right first axial stators 4 and second axial stators 5, by arranging outer magnetic pole blocks and inner magnetic pole rings thereon, a recessed area is formed between the outer magnetic pole blocks and the inner magnetic pole rings, so as to facilitate the arrangement of the axial windings. At the same time, the outer magnetic pole blocks can reduce the magnetic leakage of the radial stator 3 in the axial direction. The first axial winding 43 and the second axial winding 53 are both in a single-coil mode. The first axial winding 43 is wound around the first inner magnetic pole ring 42, and the second axial winding 53 is wound around the second inner magnetic pole ring 52, that is, both the first axial winding 43 and the second axial winding 53 are wound around the rotating shaft 1. When the axial winding is energized, the inner magnetic pole ring can apply a uniform electromagnetic force to the circumferential direction of the bearing rotor 2, which is more conducive to adjusting the position of the bearing rotor 2 in the axial direction, that is, more conducive to adjusting the position of the rotating shaft 1 in the axial direction.

[0027] Specifically, the number of the first outer magnetic pole blocks 41 is four, and the four first outer magnetic pole blocks 41 are distributed at intervals along the circumferential direction of the first axial stator 4.

[0028] Combined with reference to Figure 4 and Figure 6 As shown, compared with setting the first outer magnetic pole as a whole outer magnetic ring form, using multiple first outer magnetic pole blocks 41 evenly distributed at intervals along the circumferential direction of the first axial stator 4 can avoid the magnetic leakage of the radial magnetic circuit on the adjacent first pole column 31 or second pole column 32 on the outer circle of the first axial stator 4, and only enhance the air-gap magnetic field on the radial pole column.

[0029] Specifically, the number of the second outer magnetic pole blocks 51 is four, and the four second outer magnetic pole blocks 51 are distributed at intervals along the circumferential direction of the second axial stator 5.

[0030] Combined with reference to Figure 5As shown, compared with setting the second outer magnetic pole as a whole outer magnetic ring form, using multiple second outer magnetic pole blocks 51 evenly spaced in the circumferential direction of the second axial stator 5 can avoid the magnetic leakage phenomenon of the radial magnetic circuit on the adjacent first pole column 31 or second pole column 32 on the outer circle of the second axial stator 5, and only enhance the air-gap magnetic field on the radial pole column.

[0031] As a specific implementation manner, the four first outer magnetic pole blocks 41 respectively correspond to the positions of the four first pole columns 31, and two adjacent second pole columns 32 form a combination, and the four second outer magnetic pole blocks 51 respectively correspond to the positions of the four combinations.

[0032] In this embodiment, when the four first outer magnetic pole blocks 41 respectively correspond to the positions of the four first pole columns 31, and the four second outer magnetic pole blocks 51 respectively correspond to the positions of the four combinations, the magnetic field generated after the first axial winding 43 and the second axial winding 53 are energized can be prevented from acting on the same pole column, and magnetic flux saturation on the same pole column can be prevented. Among them, the first axial stator 4 and the second axial stator 5 have the same structure, but are relatively offset by a certain angle during assembly.

[0033] Specifically, after the first radial winding 33 and the second radial winding 34 are both energized, a radial control magnetic circuit 9 is generated. After the first axial winding 43 is energized, a first axial control magnetic circuit 10 is generated. The direction of the magnetic force lines of the first axial control magnetic circuit 10 in the first pole column 31 is the same as the direction of the magnetic force lines of the radial control magnetic circuit 9 in the first pole column 31.

[0034] Combined with reference to Figure 1 and Figure 2As shown, the current flow direction in the first radial winding 33 is from right to left, the magnetic pole of the first pole column 31 is the S pole, the current flow direction in the first axial winding 43 is from bottom to top, and the magnetic pole of the first inner magnetic pole ring 42 is the N pole. Then, it can be realized that the magnetic force line direction of the first axial control magnetic circuit 10 in the first pole column 31 is the same as that of the radial control magnetic circuit 9 in the first pole column 31. It is also possible to change the current flow direction, so that the current flow direction in the first radial winding 33 is from left to right, then the magnetic pole of the first pole column 31 is the N pole, and the current flow direction of the first axial winding 43 is from top to bottom, then the magnetic pole of the first pole column 31 is the S pole. It can also be realized that the magnetic force line direction of the first axial control magnetic circuit 10 in the first pole column 31 is the same as that of the radial control magnetic circuit 9 in the first pole column 31. When the magnetic force line direction of the first axial control magnetic circuit 10 in the first pole column 31 is the same as that of the radial control magnetic circuit 9 in the first pole column 31, that is, the axial magnetic circuit will not reduce the radial magnetic circuit, it will enhance the radial air-gap magnetic flux and enhance the magnetic attraction force of the first pole column 31 on the bearing rotor 2. However, this is only the influence of the axial magnetic flux on the pole column in one quadrant, and the enhancement of the axial magnetic flux on the radial magnetic flux in the four quadrants cancels each other out. That is, although the radial magnetic circuit and the axial magnetic circuit of the integrated magnetic bearing both pass through the bearing rotor 2, even if the axial magnetic circuit changes, it will not affect the overall radial magnetic circuit, so that the axial magnetic circuit and the radial magnetic circuit play their respective roles and simplify the control of the magnetic bearing.

[0035] As a specific implementation manner, after the second axial winding 53 is energized, a second axial control magnetic circuit 11 is generated, and the magnetic force line direction of the second axial control magnetic circuit 11 in the second pole column 32 is the same as that of the radial control magnetic circuit 9 in the second pole column 32.

[0036] Combined with reference to Figure 1 and Figure 3As shown, the current flow direction in the second radial winding 34 is from left to right, the magnetic pole of the second pole column 32 is the N pole, the current flow direction in the second axial winding 53 is from bottom to top, the magnetic pole of the second inner magnetic pole ring 52 is the S pole, and the magnetic force line direction of the second axial control magnetic circuit 11 in the second pole column 32 is the same as that of the radial control magnetic circuit 9 in the second pole column 32; it is also possible to change the current flow direction to make the current flow direction in the second radial winding 34 from right to left, the magnetic pole of the second pole column 32 the S pole, the current flow direction in the second axial winding 53 from top to bottom, and the magnetic pole of the second inner magnetic pole ring 52 the N pole, and it is also possible to achieve that the magnetic force line direction of the second axial control magnetic circuit 11 in the second pole column 32 is the same as that of the radial control magnetic circuit 9 in the second pole column 32. When the magnetic force line direction of the second axial control magnetic circuit 11 in the second pole column 32 is the same as that of the radial control magnetic circuit 9 in the second pole column 32, that is, the axial magnetic circuit will not reduce the radial magnetic circuit, then the magnetic field of the second axial control magnetic circuit 11 will not affect the magnetic suction force of the second pole column 32 on the bearing rotor 2, that is, the radial control magnetic circuit 9 and the second axial control magnetic circuit 11 do not affect each other and each plays its own role. In summary, within the same pole column unit, the magnetic pole arrangement on the three pole columns is NSN, or the magnetic pole arrangement on the three pole columns can be changed to SNS by changing the current flow direction, and at the same time, the current flow directions in the first axial winding 43 and the second axial winding 53 also need to be adaptively changed.

[0037] As a specific implementation manner, the first axial control magnetic circuit 10 is closed through the first inner magnetic pole ring 42 - the first axial working gap 7 - the bearing rotor 2 - the radial working gap 6 - the first pole column 31 - the first outer magnetic pole block 41 and back to the first axial stator 4; the second axial control magnetic circuit 11 is closed through the second outer magnetic pole block 51 - the second pole column 32 - the radial working gap 6 - the bearing rotor 2 - the second axial working gap 8 - the second inner magnetic pole ring 52 and back to the second axial stator 5; the radial control magnetic circuit 9 is closed through the first pole column 31 - the radial working gap 6 - the bearing rotor 2 - the radial working gap 6 - the second pole column 32 to the radial stator 3.

[0038] As a specific implementation manner, within the same pole column unit, two second radial windings 34 are connected in series.

[0039] In this embodiment, within the same pole column unit, the magnetic poles of two second pole columns 32 need to be the same. When two second radial windings 34 are connected in series, only one path of current is required to ensure that the magnetic poles of the two second pole columns 32 are the same.

[0040] As a specific implementation manner, along the circumferential direction of the radial stator 3, the width of the first pole column 31 is greater than the width of the second pole column 32.

[0041] Combined with reference to Figure 1As shown, within the same pole column unit, two radial control magnetic paths 9 are generated, and the two radial control magnetic paths 9 simultaneously pass through the first pole column 31 and return to the corresponding second pole column 32. When the width of the first pole column 31 is greater than that of the second pole column 32, that is, the first pole column 31 is a large tooth and the second pole column 32 is a small tooth, it is more conducive to the optimization of the magnetic path and the control of the magnetic field strength.

[0042] Specifically, along the radial direction of the radial stator 3, both the first radial winding 33 and the second radial winding 34 are located radially outside the first outer magnetic pole block 41 and the second outer magnetic pole block 51.

[0043] In this embodiment, when both the first radial winding 33 and the second radial winding 34 are located radially outside the first outer magnetic pole block 41 and the second outer magnetic pole block 51, it is possible to prevent magnetic leakage of the radial control magnetic path 9 in the axial direction and eliminate the circumferential non-uniformity of the axial output force.

[0044] As Figure 1 , when it is necessary to control the rotation shaft 1 to move left and upward, the current on the first radial winding 33 in the second quadrant can be increased, or the current on the second radial winding 34 in this quadrant can be increased, or the currents on both the first radial winding 33 and the second radial winding 34 in this quadrant can be increased simultaneously; when it is necessary to control the rotation shaft 1 to move upward, the currents on the first radial winding 33 in the first and second quadrants can be increased simultaneously, or the currents on the second radial winding 34 in the first and second quadrants can be increased simultaneously; or the currents on both the first radial winding 33 and the second radial winding 34 in the first and second quadrants can be increased simultaneously. In the radial direction, if it is desired to control the rotation shaft 1 to move in other directions, the aforementioned control principle can be adopted. As Figure 2 , when it is necessary to control the rotation shaft 1 to move leftward along the axial direction, the current of the first axial winding 43 is increased, and the electromagnetic force on the bearing rotor 2 acting to the left increases, so the bearing rotor 2 drives the rotation shaft 1 to move leftward under the action of the electromagnetic force; as Figure 3 , when it is necessary to control the rotation shaft 1 to move rightward along the axial direction, the current of the second axial winding 53 is increased, and the electromagnetic force on the bearing rotor 2 acting to the right increases, so the bearing rotor 2 drives the rotation shaft 1 to move rightward under the action of the electromagnetic force. Thus, by controlling the magnitudes of the currents of the first axial winding 43 and the second axial winding 53, the position of the bearing rotor 2 in the axial direction can be adjusted, and further the position of the rotation shaft 1 in the axial direction can be adjusted.

[0045] The present invention also provides a motor, including the above-mentioned magnetic levitation active three-degree-of-freedom bearing.

[0046] The present invention also provides a compressor, including the above-mentioned magnetic levitation active three-degree-of-freedom bearing.

[0047] Those skilled in the art can easily understand that, on the premise of no conflict, the above-mentioned advantageous ways can be freely combined and superimposed.

[0048] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and variations can be made without departing from the technical principle of the present invention, and these improvements and variations should also be regarded as within the protection scope of the present invention.

Claims

1. A magnetic levitation active three-degree-of-freedom bearing, characterized in that, It includes a rotating shaft (1), a bearing rotor (2), a radial stator (3), a first axial stator (4) and a second axial stator (5). The bearing rotor (2) is fixedly sleeved on the outer peripheral wall of the rotating shaft (1). The radial stator (3) is sleeved outside the bearing rotor (2). There is a radial working gap (6) between the radial stator (3) and the bearing rotor (2). The first axial stator (4) and the second axial stator (5) are respectively sleeved outside the rotating shaft (1), and the first axial stator (4) and the second axial stator (5) are respectively and simultaneously on both sides of the bearing rotor (2) and the radial stator (3). The radial stator (3) includes four pole column units separated by four quadrants. The pole column unit has a first pole column (31) facing the inside of the radial stator (3) and two second pole columns (32). Along the circumferential direction of the radial stator (3), the two second pole columns (32) are respectively located on both sides of the first pole column (31) and are symmetric with respect to the first pole column (31). A first radial winding (33) is wound on the first pole column (31), and a second radial winding (34) is wound on the second pole column (32). The first axial stator (4) includes a first outer magnetic pole block (41) and a first inner magnetic pole ring (42). A first axial winding (43) is arranged between the first outer magnetic pole block (41) and the first inner magnetic pole ring (42). There is a first axial working gap (7) between the first inner magnetic pole ring (42) and the bearing rotor (2). The second axial stator (5) includes a second outer magnetic pole block (51) and a second inner magnetic pole ring (52). A second axial winding (53) is arranged between the second outer magnetic pole block (51) and the second inner magnetic pole ring (52). There is a second axial working gap (8) between the second inner magnetic pole ring (52) and the bearing rotor (2). The number of the first outer magnetic pole blocks (41) is four. The four first outer magnetic pole blocks (41) are circumferentially spaced apart along the first axial stator (4). The number of the second outer magnetic pole blocks (51) is four. The four second outer magnetic pole blocks (51) are circumferentially spaced apart along the second axial stator (5). The four first outer magnetic pole blocks (41) respectively correspond to the positions of the four first pole columns (31). Adjacent two second pole columns (32) form a combination. The four second outer magnetic pole blocks (51) respectively correspond to the positions of the four combinations.

2. The magnetic levitation active three-degree-of-freedom bearing according to claim 1, wherein After the first radial winding (33) and the second radial winding (34) are both energized, a radial control magnetic circuit (9) is generated. After the first axial winding (43) is energized, a first axial control magnetic circuit (10) is generated. The magnetic force line direction of the first axial control magnetic circuit (10) in the first pole column (31) is the same as the magnetic force line direction of the radial control magnetic circuit (9) in the first pole column (31).

3. The active three-degree-of-freedom magnetic levitation bearing according to claim 2, wherein The first axial control magnetic circuit (10) is closed through the first inner magnetic pole ring (42) - the first axial working gap (7) - the bearing rotor (2) - the radial working gap (6) - the first pole column (31) - the first outer magnetic pole block (41) back to the first axial stator (4); the radial control magnetic circuit (9) is closed through the first pole column (31) - the radial working gap (6) - the bearing rotor (2) - the radial working gap (6) - the second pole column (32) to the radial stator (3).

4. The active three-degree-of-freedom magnetic levitation bearing according to claim 2, wherein After the second axial winding (53) is energized, a second axial control magnetic circuit (11) is generated. The direction of the magnetic force lines of the second axial control magnetic circuit (11) in the second pole column (32) is the same as that of the magnetic force lines of the radial control magnetic circuit (9) in the second pole column (32).

5. The magnetic levitation active three-degree-of-freedom bearing according to claim 4, characterized in that, The second axial control magnetic circuit (11) is closed through the second outer magnetic pole block (51) - the second pole column (32) - the radial working gap (6) - the bearing rotor (2) - the second axial working gap (8) - the second inner magnetic pole ring (52) back to the second axial stator (5); the radial control magnetic circuit (9) is closed through the first pole column (31) - the radial working gap (6) - the bearing rotor (2) - the radial working gap (6) - the second pole column (32) to the radial stator (3).

6. The active three-degree-of-freedom magnetic suspension bearing according to claim 1, wherein Within the same pole column unit, the two second radial windings (34) are connected in series.

7. The active three-degree-of-freedom magnetic suspension bearing according to claim 1, wherein Along the circumferential direction of the radial stator (3), the width of the first pole column (31) is greater than the width of the second pole column (32).

8. The magnetic levitation active three-degree-of-freedom bearing according to claim 1, characterized in that, Along the radial direction of the radial stator (3), both the first radial winding (33) and the second radial winding (34) are located radially outside the first outer magnetic pole block (41) and the second outer magnetic pole block (51).

9. A motor, characterized in that, Comprising the magnetic suspension active three-degree-of-freedom bearing according to any one of claims 1 to 8.

10. A compressor, characterized in that, Comprising the magnetic suspension active three-degree-of-freedom bearing according to any one of claims 1 to 8.

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