A magnetically suspended active three-degree-of-freedom bearing, motor and compressor

Abstract

The present invention provides a magnetically suspended active three-degree-of-freedom bearing and a compressor. The magnetically suspended active three-degree-of-freedom bearing includes: an axial magnetic bearing, a radial magnetic bearing and a bearing rotor. The axial magnetic bearing includes a first axial stator and a second axial stator. The radial magnetic bearing includes a radial stator. The radial stator is located at the outer periphery of the bearing rotor and can apply a radial electromagnetic force to the bearing rotor. The first axial stator and the second axial stator can apply an axial electromagnetic force to the bearing rotor. The bias magnetic flux of the radial magnetic bearing is provided by the axial magnetic bearing. The first axial stator and the second axial stator are both block structures arranged at intervals along the circumferential direction. The number of radial stator poles is 16, that is, a radial 16-pole stator is formed. According to the present invention, the first and second axial stators can effectively provide a bias magnetic circuit for the radial stator, eliminating the original structure such as the bias stator, and the structure is more compact and simple, the process difficulty is reduced, the volume is reduced, and the assembly is easy.

Description

Technical Field

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

[0002] Magnetic bearings use the electromagnetic force on the rotor to suspend the shaft, and the 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.

[0003] The active three-degree-of-freedom magnetic bearing in patent number CN110017330A "An axial radial electromagnetic magnetic bearing" has a complex structure and uses an E-shaped salient pole radial segmented stator to form a bias flux for the radial bearing. Its processing and manufacturing process is complex and difficult to assemble, and there is magnetic leakage in the axial direction of the radial suspended winding.

[0004] Since the magnetically levitated active three-degree-of-freedom bearing in the prior art forms the bias magnetic flux of the radial bearing by setting an offset stator, which leads to technical problems such as complex structure, large volume, complex process, and difficult assembly, the present invention studies and designs a magnetically levitated active three-degree-of-freedom bearing, motor and compressor. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art that the magnetically levitated active three-degree-of-freedom bearing forms the bias magnetic flux of the radial bearing by setting an offset stator, resulting in a complex structure and a large volume, thereby providing a magnetically levitated active three-degree-of-freedom bearing, a motor and a compressor.

[0006] In order to solve the above problems, the present invention provides a magnetically suspended active three-degree-of-freedom bearing, which comprises:

[0007] An axial magnetic bearing, a radial magnetic bearing and a bearing rotor, wherein the axial magnetic bearing and the radial magnetic bearing are both sleeved on the outer circumference of a rotating shaft, the axial magnetic bearing comprises a first axial stator and a second axial stator, the radial magnetic bearing comprises a radial stator, the bearing rotor is sleeved on the outer circumference of the rotating shaft and can rotate with the rotating shaft, the radial stator is located on the outer circumference of the bearing rotor and can apply a radial electromagnetic force to the bearing rotor, at least part of the structure of the first axial stator along the axial direction of the rotating shaft is located at one axial end of the bearing rotor, at least part of the structure of the second axial stator is located at the other axial end of the bearing rotor, the first axial stator and the second axial stator can apply an axial electromagnetic force to the bearing rotor, and at least part of the structure of the first axial stator is located on the radial outer side of the bearing rotor, at least part of the structure of the second axial stator is located on the radial outer side of the bearing rotor, so that the bias magnetic flux of the radial magnetic bearing is provided by the axial magnetic bearing, and the first axial stator and the second axial stator are both block structures spaced apart along the circumferential direction;

[0008] The radial stator includes a radial iron core and a radial winding. The radial iron core is an annular structure and is sleeved on the radial outer side of the bearing rotor. The radial iron core includes a radial stator yoke and a radial stator pole. The radial stator yoke is an annular structure. The radial outer end of the radial stator pole is connected to the radial stator yoke, and the radial inner end protrudes toward the bearing rotor and has a radial working gap with the bearing rotor. The radial winding is wound on each radial stator pole. The number of the radial stator poles is 16, forming a radial 16-pole stator.

[0009] In some embodiments, the first axial stator and the second axial stator have the same structure and both include a first axial stator unit, a second axial stator unit, a third axial stator unit, a fourth axial stator unit, a fifth axial stator unit, a sixth axial stator unit, a seventh axial stator unit, an eighth axial stator unit, a ninth axial stator unit, a tenth axial stator unit, an eleventh axial stator unit and a twelfth axial stator unit which are arranged in sequence along the circumferential direction.

[0010] In some embodiments, in a radial cross section, the radial stator includes a first quadrant portion located at the upper right, a second quadrant portion located at the upper left, a third quadrant portion located at the lower left, and a fourth quadrant portion located at the lower right, the first quadrant portion, the second quadrant portion, the third quadrant portion, and the fourth quadrant portion are sequentially connected in a counterclockwise direction, the first quadrant portion forms a diagonal with the third quadrant portion, and the second quadrant portion forms a diagonal with the fourth quadrant portion.

[0011] In some embodiments, the radial stator pole includes a second radial magnetic pole, a third radial magnetic pole, a fourth radial magnetic pole, and a fifth radial magnetic pole located in the first quadrant portion, the radial stator pole also includes a sixth radial magnetic pole, a seventh radial magnetic pole, an eighth radial magnetic pole, and a ninth radial magnetic pole located in the fourth quadrant portion, the radial stator pole also includes a tenth radial magnetic pole, an eleventh radial magnetic pole, a twelfth radial magnetic pole, and a thirteenth radial magnetic pole located in the third quadrant portion, the radial stator pole also includes a fourteenth radial magnetic pole, a fifteenth radial magnetic pole, a sixteenth radial magnetic pole, and the first radial magnetic pole located in the second quadrant portion.

[0012] In some embodiments, along the circumferential direction of the radial stator, the second radial magnetic pole, the third radial magnetic pole, the fourth radial magnetic pole and the fifth radial magnetic pole are arranged in sequence, and the circumferential width of the third radial magnetic pole is equal to the circumferential width of the fourth radial magnetic pole, the circumferential width of the second radial magnetic pole is equal to the circumferential width of the fifth radial magnetic pole, and the circumferential width of the third radial magnetic pole is greater than the circumferential width of the second radial magnetic pole;

[0013] Along the circumferential direction of the radial stator, the sixth radial magnetic pole, the seventh radial magnetic pole, the eighth radial magnetic pole and the ninth radial magnetic pole are arranged in sequence, and the circumferential width of the seventh radial magnetic pole is equal to the circumferential width of the eighth radial magnetic pole, the circumferential width of the sixth radial magnetic pole is equal to the circumferential width of the ninth radial magnetic pole, and the circumferential width of the seventh radial magnetic pole is greater than the circumferential width of the sixth radial magnetic pole;

[0014] Along the circumferential direction of the radial stator, the tenth radial magnetic pole, the eleventh radial magnetic pole, the twelfth radial magnetic pole and the thirteenth radial magnetic pole are arranged in sequence, and the circumferential width of the eleventh radial magnetic pole is equal to the circumferential width of the twelfth radial magnetic pole, the circumferential width of the tenth radial magnetic pole is equal to the circumferential width of the thirteenth radial magnetic pole, and the circumferential width of the eleventh radial magnetic pole is greater than the circumferential width of the tenth radial magnetic pole;

[0015] Along the circumferential direction of the radial stator, the fourteenth radial magnetic pole, the fifteenth radial magnetic pole, the sixteenth radial magnetic pole and the first radial magnetic pole are arranged in sequence, and the circumferential width of the fifteenth radial magnetic pole is equal to the circumferential width of the sixteenth radial magnetic pole, the circumferential width of the fourteenth radial magnetic pole is equal to the circumferential width of the first radial magnetic pole, and the circumferential width of the fifteenth radial magnetic pole is greater than the circumferential width of the fourteenth radial magnetic pole.

[0016] In some embodiments, the second radial magnetic pole, the bearing rotor, the third radial magnetic pole, and the magnetic circuit inside the radial stator yoke are also connected to form a closed-loop radial bearing magnetic circuit; the third radial magnetic pole, the bearing rotor, the fourth radial magnetic pole, and the magnetic circuit inside the radial stator yoke are also connected to form a closed-loop radial bearing magnetic circuit; the fourth radial magnetic pole, the bearing rotor, the fifth radial magnetic pole, and the magnetic circuit inside the radial stator yoke are also connected to form a closed-loop radial bearing magnetic circuit;

[0017] The sixth radial magnetic pole, the bearing rotor, the seventh radial magnetic pole and the magnetic circuit inside the radial stator yoke are also connected to form a closed-loop radial bearing magnetic circuit; the seventh radial magnetic pole, the bearing rotor, the eighth radial magnetic pole and the magnetic circuit inside the radial stator yoke are also connected to form a closed-loop radial bearing magnetic circuit; the eighth radial magnetic pole, the bearing rotor, the ninth radial magnetic pole and the magnetic circuit inside the radial stator yoke are also connected to form a closed-loop radial bearing magnetic circuit;

[0018] The tenth radial magnetic pole, the bearing rotor, the eleventh radial magnetic pole and the magnetic circuit inside the radial stator yoke are also connected to form a closed-loop radial bearing magnetic circuit; the eleventh radial magnetic pole, the bearing rotor, the twelfth radial magnetic pole and the magnetic circuit inside the radial stator yoke are also connected to form a closed-loop radial bearing magnetic circuit; the twelfth radial magnetic pole, the bearing rotor, the thirteenth radial magnetic pole and the magnetic circuit inside the radial stator yoke are also connected to form a closed-loop radial bearing magnetic circuit;

[0019] The magnetic circuits inside the fourteenth radial magnetic pole, the bearing rotor, the fifteenth radial magnetic pole and the radial stator yoke are also connected to form a closed-loop radial bearing magnetic circuit; the magnetic circuits inside the fifteenth radial magnetic pole, the bearing rotor, the sixteenth radial magnetic pole and the radial stator yoke are also connected to form a closed-loop radial bearing magnetic circuit; the magnetic circuits inside the sixteenth radial magnetic pole, the bearing rotor, the first radial magnetic pole and the radial stator yoke are also connected to form a closed-loop radial bearing magnetic circuit.

[0020] In some embodiments, the first axial stator unit is opposite to the first radial magnetic pole in the second quadrant portion and the second radial magnetic pole in the first quadrant portion, and a bias magnetic circuit is provided to the first radial magnetic pole and the second radial magnetic pole through the first axial stator unit; the second axial stator unit is opposite to the third radial magnetic pole in the first quadrant portion, and a bias magnetic circuit is provided to the third radial magnetic pole through the second axial stator unit; the third axial stator unit is opposite to the fourth radial magnetic pole in the first quadrant portion, and a bias magnetic circuit is provided to the fourth radial magnetic pole through the third axial stator unit;

[0021] The fourth axial stator unit is opposite to the fifth radial magnetic pole in the first quadrant part and the sixth radial magnetic pole in the fourth quadrant part, and a bias magnetic circuit is provided to the fifth radial magnetic pole and the sixth radial magnetic pole through the fourth axial stator unit; the fifth axial stator unit is opposite to the seventh radial magnetic pole in the fourth quadrant part, and a bias magnetic circuit is provided to the seventh radial magnetic pole through the fifth axial stator unit; the sixth axial stator unit is opposite to the eighth radial magnetic pole in the fourth quadrant part, and a bias magnetic circuit is provided to the eighth radial magnetic pole through the sixth axial stator unit;

[0022] The seventh axial stator unit is opposite to the ninth radial magnetic pole in the fourth quadrant part and the tenth radial magnetic pole in the third quadrant part, and a bias magnetic circuit is provided to the ninth radial magnetic pole and the tenth radial magnetic pole through the seventh axial stator unit; the eighth axial stator unit is opposite to the eleventh radial magnetic pole in the third quadrant part, and a bias magnetic circuit is provided to the eleventh radial magnetic pole through the eighth axial stator unit; the ninth axial stator unit is opposite to the twelfth radial magnetic pole in the third quadrant part, and a bias magnetic circuit is provided to the twelfth radial magnetic pole through the ninth axial stator unit;

[0023] The tenth axial stator unit is opposite to the thirteenth radial magnetic pole in the third quadrant part and the fourteenth radial magnetic pole in the second quadrant part, and a bias magnetic circuit is provided to the thirteenth radial magnetic pole and the fourteenth radial magnetic pole through the tenth axial stator unit; the eleventh axial stator unit is opposite to the fifteenth radial magnetic pole in the second quadrant part, and a bias magnetic circuit is provided to the fifteenth radial magnetic pole through the eleventh axial stator unit; the twelfth axial stator unit is opposite to the sixteenth radial magnetic pole in the second quadrant part, and a bias magnetic circuit is provided to the sixteenth radial magnetic pole through the twelfth axial stator unit.

[0024] In some embodiments, the bias magnetic circuits provided by the first axial stator unit to the first radial magnetic pole and the second radial magnetic pole are both in the radial direction toward the center of the rotating shaft; the bias magnetic circuit provided by the second axial stator unit to the third radial magnetic pole is in the radial direction away from the center of the rotating shaft; the bias magnetic circuit provided by the third axial stator unit to the fourth radial magnetic pole is in the radial direction toward the center of the rotating shaft;

[0025] The bias magnetic circuits provided by the fourth axial stator unit to the fifth radial magnetic pole and the sixth radial magnetic pole are both away from the center of the rotating shaft in the radial direction; the bias magnetic circuit provided by the fifth axial stator unit to the seventh radial magnetic pole is toward the center of the rotating shaft in the radial direction; the bias magnetic circuit provided by the sixth axial stator unit to the eighth radial magnetic pole is away from the center of the rotating shaft in the radial direction;

[0026] The bias magnetic circuits provided by the seventh axial stator unit to the ninth radial magnetic pole and the tenth radial magnetic pole are both in the radial direction toward the center of the rotating shaft; the bias magnetic circuit provided by the eighth axial stator unit to the eleventh radial magnetic pole is away from the center of the rotating shaft in the radial direction; the bias magnetic circuit provided by the ninth axial stator unit to the twelfth radial magnetic pole is in the radial direction toward the center of the rotating shaft;

[0027] The bias magnetic circuits provided by the tenth axial stator unit to the thirteenth radial magnetic pole and the fourteenth radial magnetic pole are both away from the center of the rotating shaft in the radial direction; the bias magnetic circuit provided by the eleventh axial stator unit to the fifteenth radial magnetic pole is toward the center of the rotating shaft in the radial direction; the bias magnetic circuit provided by the twelfth axial stator unit to the sixteenth radial magnetic pole is away from the center of the rotating shaft in the radial direction.

[0028] In some embodiments, the first axial stator includes a first axial core and a first axial winding, the first axial core is an annular structure, the first axial core includes a first main body, a first annular portion and a second annular portion, the first main body is a disc structure with a first center hole, the first center hole accommodates the rotating shaft passing therethrough, the second annular portion is located radially outside the first annular portion, one end of the first annular portion is connected to the first main body and the other end extends toward the direction of the bearing rotor to be opposite to the bearing rotor, one end of the second annular portion is connected to the first main body and the other end extends toward the direction of the radial core to be opposite to the radial core, so as to form a first accommodating groove between the radial outer side of the first annular portion and the radial inner side of the second annular portion, and the first axial winding is wound on the second annular portion.

[0029] In some embodiments, the first annular portion extends along the axial direction of the rotating shaft and is spaced from the bearing rotor by a third preset distance, forming a first axial working gap; the second annular portion also extends along the axial direction of the rotating shaft and is spaced from the radial iron core by a fourth preset distance, forming a second axial working gap.

[0030] In some embodiments, the second axial stator includes a second axial core and a second axial winding, the second axial core is an annular structure, the second axial core includes a second main body, a third annular portion and a fourth annular portion, the second main body is a disc structure with a second center hole, the second center hole accommodates the rotating shaft passing therethrough, one end of the third annular portion is connected to the second main body and the other end extends toward the direction of the bearing rotor to be opposite to the bearing rotor, one end of the fourth annular portion is connected to the second main body and the other end extends toward the direction of the radial core to be opposite to the radial core, and the fourth annular portion is located radially outside the third annular portion to form a second accommodating groove between the radial outside of the third annular portion and the radial inside of the fourth annular portion, and the second axial winding is wound on the fourth annular portion.

[0031] In some embodiments, the third annular portion extends along the axial direction of the rotating shaft and is spaced from the bearing rotor by a fifth preset distance, forming a first axial working gap; the fourth annular portion also extends along the axial direction of the rotating shaft and is spaced from the radial iron core by a sixth preset distance, forming a second axial working gap.

[0032] In some embodiments, the first axial winding and the second axial winding are energized in opposite directions; the radial winding is located radially outside the second annular portion and the fourth annular portion at the same time, and the second annular portion and the fourth annular portion are both opposite to the radial stator pole.

[0033] The present invention also provides a motor, comprising the magnetically suspended active three-degree-of-freedom bearing as described in any of the preceding items.

[0034] The present invention also provides a compressor, comprising the magnetically suspended active three-degree-of-freedom bearing as described in any of the preceding items.

[0035] The present invention provides a magnetically suspended active three-degree-of-freedom bearing, a motor and a compressor, which have the following beneficial effects:

[0036] 1. The present invention effectively arranges the axial magnetic bearing and the radial magnetic bearing so that the radial stator is located at the outer periphery of the bearing rotor and can apply radial electromagnetic force to the bearing rotor. At least part of the structure of the first axial stator is located at one axial end of the bearing rotor, and at least part of the structure of the second axial stator is located at the other axial end of the bearing rotor. The first axial stator and the second axial stator can apply axial electromagnetic force to the bearing rotor, so that the radial offset of the rotating shaft can be adjusted by the radial electromagnetic force applied by the radial stator to the bearing rotor. At the same time, the axial offset of the rotating shaft can be adjusted by the axial electromagnetic force applied by the first and second axial stators to the bearing rotor, and finally the purpose of radial and axial support of the rotating shaft is achieved, so that the bias magnetic flux of the radial magnetic bearing is provided by the axial magnetic bearing, so that compared with the existing active three-degree-of-freedom magnetic suspension bearing that needs to provide a bias magnetic circuit for the radial bearing by setting a structure such as a bias stator, the present invention can effectively provide a bias magnetic circuit for the radial stator by setting the above structure, eliminating the original structure such as the bias stator, and the structure is more compact and simple, and the workmanship is simple. The invention has the advantages of reduced technical difficulty, reduced volume and easy assembly; the invention effectively combines the radial magnetic bearing with the axial magnetic bearing to form an integrated shaft and radial integrated magnetic bearing structure, which is compared with the separate axial magnetic bearing and radial magnetic bearing in the prior art, which need to separately set the thrust bearing for the axial magnetic bearing to provide axial force to the rotating shaft, and need to set the radial magnetic bearing rotor for the radial magnetic bearing, effectively saves the structure of the thrust bearing, so that the axial size of the rotor is effectively reduced and shortened, integrates the radial bearing and the axial bearing, has no thrust plate, has a compact structure, reduces the bearing size, shortens the rotor length, increases the critical speed of the rotor, and improves the stability and applicability of the magnetic suspension system; the invention provides a bias magnetic circuit for the radial stator through the axial stator, which can effectively save the structure of the permanent magnet compared with the hybrid magnetic suspension bearing, has low cost, is easy to assemble, has a large bearing capacity, and can operate at high power; the invention also effectively reduces and avoids the leakage magnetic phenomenon of the radial magnetic circuit on the outer circle of the axial stator by making the axial stator magnetic pole into a block structure, thereby effectively enhancing the air gap magnetic field on the radial magnetic pole, improving the control magnetic flux, improving the radial output, and improving the control performance;

[0037] 2. The present invention also arranges the radial winding on the radial outside of the first axial iron core and the second axial iron core, and the second annular portion and the fourth annular portion are opposite to the radial stator pole. Compared with the existing solution in which the upper magnetic pole of the axial stator is located next to the radial stator yoke (that is, the existing upper magnetic pole of the axial stator is located on the axial side of the radial stator yoke), it can effectively reduce the leakage magnetic field of the radial magnetic circuit in the axial direction and effectively eliminate the situation in which the axial output is uneven in the circumferential direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1It is an exploded structural diagram of the magnetically suspended active three-degree-of-freedom bearing of the present invention;

[0039] Figure 2 It is a cross-sectional structural diagram of the magnetically suspended active three-degree-of-freedom bearing of the present invention (radial cross section, radial magnetic circuit of the three-degree-of-freedom bearing);

[0040] Figure 3 : is a longitudinal section structure diagram of the magnetic suspension active three-degree-of-freedom bearing of the present invention ( Figure 2 AA sectional axial section, axial magnetic circuit of three-degree-of-freedom bearing);

[0041] Figure 4 yes Figure 3 The matching structure diagram of the axial stator, radial stator and bearing rotor in the upper middle part;

[0042] Figure 5 : is a longitudinal section structure diagram of the magnetic suspension active three-degree-of-freedom bearing of the present invention ( Figure 2 BB sectional axial section, axial magnetic circuit of three-degree-of-freedom bearing);

[0043] Figure 6 It is a schematic cross-sectional view of the axial stator of the magnetically suspended active three-degree-of-freedom bearing of the present invention.

[0044] The reference numerals are as follows:

[0045] 100, axial magnetic bearing; 300, first axial stator; 1, radial stator yoke; 2, rotating shaft; 3, radial bearing magnetic circuit; 31, radial bearing magnetic circuit at the upper part of section A; 32, radial bearing magnetic circuit at the lower part of section A; 4, axial bearing magnetic circuit; 41, axial bearing magnetic circuit at the upper part of section A; 42, axial bearing magnetic circuit at the lower part of section A; 43, axial bearing magnetic circuit at the upper part of section B; 44, axial bearing magnetic circuit at the lower part of section B; 6, first axial core; 6a, first main body; 6b, first annular 6c, second annular portion; 6d, first accommodating groove; 61, first axial stator unit; 62, second axial stator unit; 63, third axial stator unit; 64, fourth axial stator unit; 65, fifth axial stator unit; 66, sixth axial stator unit; 67, seventh axial stator unit; 68, eighth axial stator unit; 69, ninth axial stator unit; 610, tenth axial stator unit; 611, eleventh axial stator unit; 612, twelfth axial stator unit; 7. first axial winding; 400. second axial stator; 11. second axial core; 11a. second main body; 11b. third annular portion; 11c. fourth annular portion; 11d. second receiving groove; 12. second axial winding; 200. radial magnetic bearing; 500. radial stator; 5. radial winding; 9. bearing rotor; 10. radial core; 8. radial stator pole; 81. first radial magnetic pole; 82. second radial magnetic pole; 83. third radial magnetic pole; 84. fourth radial magnetic pole; Pole; 85, the fifth radial magnetic pole; 86, the sixth radial magnetic pole; 87, the seventh radial magnetic pole; 88, the eighth radial magnetic pole; 89, the ninth radial magnetic pole; 810, the tenth radial magnetic pole; 811, the eleventh radial magnetic pole; 812, the twelfth radial magnetic pole; 813, the thirteenth radial magnetic pole; 814, the fourteenth radial magnetic pole; 815, the fifteenth radial magnetic pole; 816, the sixteenth radial magnetic pole; 15, radial working gap; 16, the first axial working gap; 19, the second axial working gap. DETAILED DESCRIPTION

[0046] like Figure 1-6 As shown, the present invention provides a magnetically suspended active three-degree-of-freedom bearing, which comprises:

[0047] An axial magnetic bearing 100, a radial magnetic bearing 200 and a bearing rotor 9, wherein the axial magnetic bearing 100 and the radial magnetic bearing 200 are both sleeved on the outer periphery of the rotating shaft 2, the axial magnetic bearing 100 includes a first axial stator 300 and a second axial stator 400, the radial magnetic bearing 200 includes a radial stator 500, the bearing rotor 9 is sleeved on the outer periphery of the rotating shaft 2 and can rotate with the rotating shaft 2, the radial stator 500 is located on the outer periphery of the bearing rotor 9 and can apply a radial electromagnetic force to the bearing rotor 9, along the rotating shaft In the axial direction of the shaft 2, at least part of the structure of the first axial stator 300 is located at one axial end of the bearing rotor 9, and at least part of the structure of the second axial stator 400 is located at the other axial end of the bearing rotor 9. The first axial stator 300 and the second axial stator 400 can apply axial electromagnetic force to the bearing rotor 9, so that the bias magnetic flux of the radial magnetic bearing 200 is provided by the axial magnetic bearing 100. The first axial stator 300 and the second axial stator 400 are both block structures arranged at intervals along the circumferential direction.

[0048] The radial stator 500 includes a radial core 10 and a radial winding 5. The radial core 10 is an annular structure and is sleeved on the radial outer side of the bearing rotor 9. The radial core 10 includes a radial stator yoke 1 and a radial stator pole 8. The radial stator yoke 1 is an annular structure. The radial outer end of the radial stator pole is connected to the radial stator yoke 1, and the radial inner end protrudes toward the bearing rotor 9 and has a radial working gap 15 between the radial stator pole and the bearing rotor 9. The radial winding 5 is wound on each radial stator pole. The number of the radial stator poles is 16, that is, a radial 16-pole stator is formed.

[0049] The present invention effectively arranges the axial magnetic bearing and the radial magnetic bearing so that the radial stator is located at the outer periphery of the bearing rotor and can apply radial electromagnetic force to the bearing rotor. At least part of the structure of the first axial stator is located at one axial end of the bearing rotor, and at least part of the structure of the second axial stator is located at the other axial end of the bearing rotor. The first axial stator and the second axial stator can apply axial electromagnetic force to the bearing rotor, so that the radial offset of the rotating shaft can be adjusted by the radial electromagnetic force applied by the radial stator to the bearing rotor. At the same time, the axial offset of the rotating shaft can be adjusted by the axial electromagnetic force applied by the first and second axial stators to the bearing rotor, ultimately achieving the purpose of radial and axial support for the rotating shaft, so that the bias flux of the radial magnetic bearing is provided by the axial magnetic bearing, so that compared with the existing active three-degree-of-freedom magnetic suspension bearing that needs to provide a bias magnetic circuit for the radial bearing by setting structures such as a bias stator, the present invention can effectively provide a bias magnetic circuit for the radial stator by setting the above-mentioned structure, eliminating the original structures such as the bias stator, and the structure is more compact and simple, and the process is simple. The difficulty is reduced, the volume is reduced, and the assembly is easy; the present invention effectively combines the radial magnetic bearing with the axial magnetic bearing to form an integrated shaft and radial integrated magnetic bearing structure. Compared with the separate axial magnetic bearing and radial magnetic bearing in the prior art, which need to separately set a thrust bearing for the axial magnetic bearing to provide axial force to the rotating shaft, and need to set a radial magnetic bearing rotor for the radial magnetic bearing, the thrust bearing structure is effectively omitted, so that the axial size of the rotor is effectively reduced and shortened, and the radial bearing and the axial bearing are integrated, without a thrust plate, the structure is compact, the bearing size is reduced, the rotor length is shortened, the critical speed of the rotor is increased, and the stability and applicability of the magnetic suspension system are improved; the present invention provides a bias magnetic circuit for the radial stator through the axial stator, which can effectively omit the structure of the permanent magnet compared with the hybrid magnetic suspension bearing, has low cost, convenient assembly, large bearing capacity, and can operate at high power; the present invention also effectively reduces and avoids the leakage magnetic phenomenon of the radial magnetic circuit on the outer circle of the axial stator by making the axial stator magnetic pole into a block structure, thereby effectively enhancing the air gap magnetic field on the radial magnetic pole, improving the control magnetic flux, improving the radial output, and improving the control performance.

[0050] In some embodiments, the first axial stator 300 and the second axial stator 400 have the same structure, and both include a first axial stator unit 61, a second axial stator unit 62, a third axial stator unit 63, and a fourth axial stator unit 64, a fifth axial stator unit 65, a sixth axial stator unit 66, a seventh axial stator unit 67, an eighth axial stator unit 68, a ninth axial stator unit 69, a tenth axial stator unit 610, an eleventh axial stator unit 611, and a twelfth axial stator unit 612, which are sequentially arranged in a circumferential direction. This is a preferred block form of the axial stator of the present invention, that is, a plurality of axial stator units spaced apart in the circumferential direction, which can enable a single axial stator unit to form a magnetic flux closed loop with some poles of the radial stator, provide bias magnetic flux for the radial stator, and effectively prevent magnetic leakage of the magnetic circuit of the radial stator on the outer circle of the axial stator, thereby improving radial output and radial control performance.

[0051] 1. The present invention provides a radial / axial integrated three-degree-of-freedom controlled active magnetic bearing structure, which adopts a 16-pole radial bearing; the thrust plate is removed and replaced by a bearing rotor, and the radial bearing and the axial bearing are integrated. Compared with conventional active magnetic bearings, there is no need to install a thrust plate, the structure is compact, and the process is simple; compared with the usual hybrid three-degree-of-freedom magnetic bearing, there is no permanent magnet, and the bias magnetic field and control magnetic field are provided by electromagnetic force, with large bearing capacity, high rigidity, and flexible control. This three-degree-of-freedom magnetic bearing can operate at high power and high critical speed, improving the stability and applicability of the magnetic suspension system.

[0052] 2. The present invention also provides two bearing coil electrification methods. AA and BB are one electrification method, and the other electrification method is to completely reverse the axial electrification, in order to control the radial motion of the rotor, increase the radial output, and improve the working efficiency of the magnetic suspension.

[0053] The present invention solves the following technical problems:

[0054] 1. Integrate the radial bearing and the axial bearing, without thrust plate, compact structure, reduce bearing size, shorten rotor length, increase rotor critical speed, and improve the stability and applicability of the magnetic suspension system.

[0055] 2. When the axial magnetic pole is located at the lower end of the radial stator, radial magnetic circuit leakage is likely to occur on the axial outer circle, reducing radial output.

[0056] In some embodiments, in a radial cross section, the radial stator 500 includes a first quadrant portion located at the upper right, a second quadrant portion located at the upper left, a third quadrant portion located at the lower left, and a fourth quadrant portion located at the lower right, the first quadrant portion, the second quadrant portion, the third quadrant portion, and the fourth quadrant portion are sequentially connected in a counterclockwise direction, the first quadrant portion forms a diagonal with the third quadrant portion, and the second quadrant portion forms a diagonal with the fourth quadrant portion; the number of radial stator poles is 16.

[0057] This is the preferred structural form of the radial stator of the present invention. Through the radial stator poles and the radial stator yoke, a small closed-loop magnetic flux and a large closed-loop magnetic flux can be formed between the bearing rotor, thereby providing radial magnetic force to the bearing rotor. The distribution form of 4 quadrants and the number of radial stator poles are the preferred distribution forms of the present invention. The present invention preferably has 16 poles, i.e., 16 radial stator poles.

[0058] In some embodiments, the radial stator pole 8 includes a second radial magnetic pole 82, a third radial magnetic pole 83, a fourth radial magnetic pole 84 and a fifth radial magnetic pole 85 located in the first quadrant part, the radial stator pole 8 also includes a sixth radial magnetic pole 86, a seventh radial magnetic pole 87, an eighth radial magnetic pole 88 and a ninth radial magnetic pole 89 located in the fourth quadrant part, the radial stator pole 8 also includes a tenth radial magnetic pole 810, an eleventh radial magnetic pole 811, a twelfth radial magnetic pole 812 and a thirteenth radial magnetic pole 813 located in the third quadrant part, the radial stator pole 8 also includes a fourteenth radial magnetic pole 814, a fifteenth radial magnetic pole 815, a sixteenth radial magnetic pole 816 and the first radial magnetic pole 81 located in the second quadrant part.

[0059] This is a further preferred structural form of the radial stator pole of the present invention, that is, 4 radial magnetic poles are distributed in the first quadrant, 4 magnetic poles are distributed in the second quadrant, 4 magnetic poles are distributed in the third quadrant, and 4 magnetic poles are distributed in the fourth quadrant, forming a 16-pole radial bearing, with simple processing and manufacturing technology and convenient radial magnetic circuit control.

[0060] In some embodiments, along the circumferential direction of the radial stator, the second radial magnetic pole 82, the third radial magnetic pole 83, the fourth radial magnetic pole 84 and the fifth radial magnetic pole 85 are arranged in sequence, and the circumferential width of the third radial magnetic pole 83 is equal to the circumferential width of the fourth radial magnetic pole 84, the circumferential width of the second radial magnetic pole 82 is equal to the circumferential width of the fifth radial magnetic pole 85, and the circumferential width of the third radial magnetic pole 83 is greater than the circumferential width of the second radial magnetic pole 82;

[0061] Along the circumferential direction of the radial stator, the sixth radial magnetic pole 86, the seventh radial magnetic pole 87, the eighth radial magnetic pole 88 and the ninth radial magnetic pole 89 are arranged in sequence, and the circumferential width of the seventh radial magnetic pole 87 is equal to the circumferential width of the eighth radial magnetic pole 88, the circumferential width of the sixth radial magnetic pole 86 is equal to the circumferential width of the ninth radial magnetic pole 89, and the circumferential width of the seventh radial magnetic pole 87 is greater than the circumferential width of the sixth radial magnetic pole 86;

[0062] Along the circumferential direction of the radial stator, the tenth radial magnetic pole 810, the eleventh radial magnetic pole 811, the twelfth radial magnetic pole 812 and the thirteenth radial magnetic pole 813 are arranged in sequence, and the circumferential width of the eleventh radial magnetic pole 811 is equal to the circumferential width of the twelfth radial magnetic pole 812, the circumferential width of the tenth radial magnetic pole 810 is equal to the circumferential width of the thirteenth radial magnetic pole 813, and the circumferential width of the eleventh radial magnetic pole 811 is greater than the circumferential width of the tenth radial magnetic pole 810;

[0063] Along the circumferential direction of the radial stator, the fourteenth radial magnetic pole 814, the fifteenth radial magnetic pole 815, the sixteenth radial magnetic pole 816 and the first radial magnetic pole 81 are arranged in sequence, and the circumferential width of the fifteenth radial magnetic pole 815 is equal to the circumferential width of the sixteenth radial magnetic pole 816, the circumferential width of the fourteenth radial magnetic pole 814 is equal to the circumferential width of the first radial magnetic pole 81, and the circumferential width of the fifteenth radial magnetic pole 815 is greater than the circumferential width of the fourteenth radial magnetic pole 814.

[0064] The present invention further preferably has the circumferential widths of multiple radial stator poles to be different, that is, the radial magnetic fluxes formed are not completely the same. The present invention can make the magnetic flux of the second radial magnetic pole form a closed loop through the third radial magnetic pole, and a closed-loop magnetic circuit can be formed between the third and fourth radial magnetic poles, and the magnetic flux of the fifth radial magnetic pole can form a closed loop through the fourth radial magnetic pole, by, for example, making the circumferential widths of the third radial magnetic pole and the fourth radial magnetic pole in the middle of the first quadrant greater than the second radial magnetic pole and the fifth radial magnetic pole on both sides thereof, further increasing the subdivision of the closed-loop magnetic circuit, so that more subdivided radial magnetic fluxes can be formed in one quadrant, thereby providing a more refined and accurate control effect for the radial direction movement control of the bearing rotor; the functions and effects of the multiple radial magnetic poles in the second quadrant, the third quadrant and the fourth quadrant are the same as above, and the accuracy of radial control can also be improved.

[0065] In some embodiments, the second radial magnetic pole 82, the bearing rotor 9, the third radial magnetic pole 83 and the magnetic circuit inside the radial stator yoke 1 are also connected to form a closed-loop radial bearing magnetic circuit 3; the third radial magnetic pole 83, the bearing rotor 9, the fourth radial magnetic pole 84 and the magnetic circuit inside the radial stator yoke 1 are also connected to form a closed-loop radial bearing magnetic circuit 3; the fourth radial magnetic pole 84, the bearing rotor 9, the fifth radial magnetic pole 85 and the magnetic circuit inside the radial stator yoke 1 are also connected to form a closed-loop radial bearing magnetic circuit 3;

[0066] The sixth radial magnetic pole 86, the bearing rotor 9, the seventh radial magnetic pole 87 and the magnetic circuit inside the radial stator yoke 1 are also connected to form a closed-loop radial bearing magnetic circuit 3; the seventh radial magnetic pole 87, the bearing rotor 9, the eighth radial magnetic pole 88 and the magnetic circuit inside the radial stator yoke 1 are also connected to form a closed-loop radial bearing magnetic circuit 3; the eighth radial magnetic pole 88, the bearing rotor 9, the ninth radial magnetic pole 89 and the magnetic circuit inside the radial stator yoke 1 are also connected to form a closed-loop radial bearing magnetic circuit 3;

[0067] The magnetic circuits inside the tenth radial magnetic pole 810, the bearing rotor 9, the eleventh radial magnetic pole 811 and the radial stator yoke 1 are also connected to form a closed-loop radial bearing magnetic circuit 3; the magnetic circuits inside the eleventh radial magnetic pole 811, the bearing rotor 9, the twelfth radial magnetic pole 812 and the radial stator yoke 1 are also connected to form a closed-loop radial bearing magnetic circuit 3; the magnetic circuits inside the twelfth radial magnetic pole 812, the bearing rotor 9, the thirteenth radial magnetic pole 813 and the radial stator yoke 1 are also connected to form a closed-loop radial bearing magnetic circuit 3;

[0068] The magnetic circuits inside the fourteenth radial magnetic pole 814, the bearing rotor 9, the fifteenth radial magnetic pole 815 and the radial stator yoke 1 are also connected to form a closed-loop radial bearing magnetic circuit 3; the magnetic circuits inside the fifteenth radial magnetic pole 815, the bearing rotor 9, the sixteenth radial magnetic pole 816 and the radial stator yoke 1 are also connected to form a closed-loop radial bearing magnetic circuit 3; the magnetic circuits inside the sixteenth radial magnetic pole 816, the bearing rotor 9, the first radial magnetic pole 81 and the radial stator yoke 1 are also connected to form a closed-loop radial bearing magnetic circuit 3.

[0069] The present invention further preferably forms a closed-loop magnetic flux between the second radial magnetic pole and the third radial magnetic pole in the first quadrant, which can provide a magnetic flux directed radially inward on the second radial magnetic pole and a magnetic flux directed radially outward on the third radial magnetic pole, and the same is true for the magnetic poles in the second, third and fourth quadrants, so that the radial magnetic flux directions formed on the two radial magnetic poles with narrower widths are opposite, while the radial magnetic flux directions of the radial magnetic poles with wider widths are opposite to each other, so that it can be controlled according to the current size of the windings on the corresponding radial magnetic poles, thereby controlling whether the bearing rotor moves toward the upper right or the lower left along the first quadrant, and multiple magnetic poles and multiple windings are combined for control to improve the control accuracy; when the radial magnetic flux of each radial magnetic pole is superimposed (coupled) with the axial bias magnetic flux, it can enhance or weaken the radial magnetic flux (the direction of the radial magnetic flux of each radial magnetic pole is the same as the direction of the axial bias magnetic flux), which can improve the radial output and improve the control efficiency.

[0070] In some embodiments, the first axial stator unit 61 is opposite to the first radial magnetic pole 81 in the second quadrant portion and the second radial magnetic pole 82 in the first quadrant portion, and a bias magnetic circuit is provided to the first radial magnetic pole 81 and the second radial magnetic pole 82 through the first axial stator unit 61; the second axial stator unit 62 is opposite to the third radial magnetic pole 83 in the first quadrant portion, and a bias magnetic circuit is provided to the third radial magnetic pole 83 through the second axial stator unit 62; the third axial stator unit 63 is opposite to the fourth radial magnetic pole 84 in the first quadrant portion, and a bias magnetic circuit is provided to the fourth radial magnetic pole 84 through the third axial stator unit 63;

[0071] The fourth axial stator unit 64 is opposite to the fifth radial magnetic pole 85 in the first quadrant part and the sixth radial magnetic pole 86 in the fourth quadrant part, and a bias magnetic circuit is provided to the fifth radial magnetic pole 85 and the sixth radial magnetic pole 86 through the fourth axial stator unit 64; the fifth axial stator unit 65 is opposite to the seventh radial magnetic pole 87 in the fourth quadrant part, and a bias magnetic circuit is provided to the seventh radial magnetic pole 87 through the fifth axial stator unit 65; the sixth axial stator unit 66 is opposite to the eighth radial magnetic pole 88 in the fourth quadrant part, and a bias magnetic circuit is provided to the eighth radial magnetic pole 88 through the sixth axial stator unit 66;

[0072] The seventh axial stator unit 67 is opposite to the ninth radial magnetic pole 89 in the fourth quadrant and the tenth radial magnetic pole 810 in the third quadrant, and a bias magnetic circuit is provided to the ninth radial magnetic pole 89 and the tenth radial magnetic pole 810 through the seventh axial stator unit 67; the eighth axial stator unit 68 is opposite to the eleventh radial magnetic pole 811 in the third quadrant, and a bias magnetic circuit is provided to the eleventh radial magnetic pole 811 through the eighth axial stator unit 68; the ninth axial stator unit 69 is opposite to the twelfth radial magnetic pole 812 in the third quadrant, and a bias magnetic circuit is provided to the twelfth radial magnetic pole 812 through the ninth axial stator unit 69;

[0073] The tenth axial stator unit 610 is opposite to the thirteenth radial magnetic pole 813 in the third quadrant part and the fourteenth radial magnetic pole 814 in the second quadrant part, and a bias magnetic circuit is provided to the thirteenth radial magnetic pole 813 and the fourteenth radial magnetic pole 814 through the tenth axial stator unit 610; the eleventh axial stator unit 611 is opposite to the fifteenth radial magnetic pole 815 in the second quadrant part, and a bias magnetic circuit is provided to the fifteenth radial magnetic pole 815 through the eleventh axial stator unit 611; the twelfth axial stator unit 612 is opposite to the sixteenth radial magnetic pole 816 in the second quadrant part, and a bias magnetic circuit is provided to the sixteenth radial magnetic pole 816 through the twelfth axial stator unit 612.

[0074] This is the preferred distribution and correspondence between the segmented axial stator units and the plurality of radial magnetic poles of the present invention, that is, the first axial stator unit is opposite to the radial magnetic poles of the first and second quadrants to provide bias magnetic flux thereto, the second axial stator unit is opposite to the radial magnetic poles of the first quadrant to provide bias magnetic flux thereto, the third axial stator unit is opposite to the radial magnetic poles of the first quadrant to provide bias magnetic flux thereto, the fourth axial stator unit is opposite to the radial magnetic poles of the first and fourth quadrants to provide bias magnetic flux thereto, the fifth axial stator unit is opposite to the radial magnetic poles of the fourth quadrant to provide bias magnetic flux thereto, and the sixth axial stator unit is opposite to the radial magnetic poles of the fourth quadrant to provide bias magnetic flux thereto. The seventh axial stator unit is opposite to the radial poles of the fourth and third quadrants to provide a bias flux therefor, the eighth axial stator unit is opposite to the radial poles of the third quadrant to provide a bias flux therefor, the ninth axial stator unit is opposite to the radial poles of the third quadrant to provide a bias flux therefor, the tenth axial stator unit is opposite to the radial poles of the third and second quadrants to provide a bias flux therefor, the eleventh axial stator unit is opposite to the radial poles of the second quadrant to provide a bias flux therefor, and the twelfth axial stator unit is opposite to the radial poles of the second quadrant to provide a bias flux therefor.

[0075] In some embodiments, the bias magnetic circuits provided by the first axial stator unit 61 to the first radial magnetic pole 81 and the second radial magnetic pole 82 are both in the radial direction toward the center of the rotating shaft 2; the bias magnetic circuit provided by the second axial stator unit 62 to the third radial magnetic pole 83 is away from the center of the rotating shaft 2 in the radial direction; the bias magnetic circuit provided by the third axial stator unit 63 to the fourth radial magnetic pole 84 is in the radial direction toward the center of the rotating shaft 2;

[0076] The bias magnetic circuits provided by the fourth axial stator unit 64 to the fifth radial magnetic pole 85 and the sixth radial magnetic pole 86 are both away from the center of the rotating shaft 2 in the radial direction; the bias magnetic circuit provided by the fifth axial stator unit 65 to the seventh radial magnetic pole 87 is toward the center of the rotating shaft 2 in the radial direction; the bias magnetic circuit provided by the sixth axial stator unit 66 to the eighth radial magnetic pole 88 is away from the center of the rotating shaft 2 in the radial direction;

[0077] The bias magnetic circuits provided by the seventh axial stator unit 67 to the ninth radial magnetic pole 89 and the tenth radial magnetic pole 810 are both in the radial direction toward the center of the rotating shaft 2; the bias magnetic circuit provided by the eighth axial stator unit 68 to the eleventh radial magnetic pole 811 is away from the center of the rotating shaft 2 in the radial direction; the bias magnetic circuit provided by the ninth axial stator unit 69 to the twelfth radial magnetic pole 812 is in the radial direction toward the center of the rotating shaft 2;

[0078] The bias magnetic circuits provided by the tenth axial stator unit 610 to the thirteenth radial magnetic pole 813 and the fourteenth radial magnetic pole 814 are both away from the center of the rotating shaft 2 in the radial direction; the bias magnetic circuit provided by the eleventh axial stator unit 611 to the fifteenth radial magnetic pole 815 is toward the center of the rotating shaft 2 in the radial direction; the bias magnetic circuit provided by the twelfth axial stator unit 612 to the sixteenth radial magnetic pole 816 is away from the center of the rotating shaft 2 in the radial direction.

[0079] This is a further preferred magnetic flux relationship between the axial stator unit and the radial magnetic poles in different quadrants of the present invention, that is, the bias magnetic flux provided by the first axial stator unit and the third axial stator unit is toward the radial inside (the same as the radial magnetic flux of the narrower first radial magnetic pole 81, the second radial magnetic pole 82 and the wider fourth radial magnetic pole 84, all toward the radial inside), and the bias magnetic flux provided by the second axial stator unit and the fourth axial stator unit is toward the radial outside (the same as the radial magnetic flux of the wider third radial magnetic pole 83 and the narrower fifth radial magnetic pole 85, all toward the radial outside). Combined with the distribution form of the radial magnetic poles in different quadrants of the present invention, the radial magnetic flux provided by the radial pole in each quadrant is the same as the direction of the bias radial magnetic flux provided by the block axial stator unit in the quadrant (that is, both toward the radial inside or both toward the radial outside), and the radial output finally formed is effectively enhanced. The present invention can maximize the radial output through the different distribution forms of the block axial stator and radial poles and the power-on method, improve the effect of the magnetic suspension bearing, and improve the efficiency.

[0080] The active three-degree-of-freedom magnetic bearing structure of the present invention is as follows Figure 1 As shown, compared with the traditional active magnetic bearing structure, the thrust plate is removed and replaced by a bearing rotor, the axial stator is located at both ends of the radial stator, and the radial bearing and the axial bearing are integrated. The structure is mainly composed of a radial stator yoke 1; a bearing rotor 9; a radial winding 5; a first axial core 6; a first axial winding 7; a second axial core 11; a second axial winding 12; and radial bearing stator poles (radial stator poles 8).

[0081] In this structure, the radial bearing poles are arranged in SNSN (or NSNS) form. If the axial bearing is a full circle, the axial bearing will partially offset and partially enhance the magnetic flux of the radial magnetic circuit, resulting in inconsistent coupling of the magnetic poles of the radial bearing, and thus making the output difficult to control. In this structure, the axial bearing is divided into blocks, such as Figure 2 The two axial bearing blocks shown in the AA section and the two axial bearing blocks shown in the BB section will both enhance the magnetic flux of the corresponding radial magnetic circuit, so that the mutual influence between the axial magnetic flux and the radial magnetic flux will be smaller, thereby reducing the overall volume of the bearing while minimizing the control difficulty.

[0082] The flow direction of the first radial bearing magnetic circuit of the structure is four groups of three cycles: the second radial magnetic pole 82 → bearing rotor 9 → third radial magnetic pole 83 → radial stator yoke 1 → second radial magnetic pole 82 (cycle 1) + fourth radial magnetic pole 84 → bearing rotor 9 → third radial magnetic pole 83 → radial stator yoke 1 → fourth radial magnetic pole 84 (cycle 2) + fourth radial magnetic pole 84 → bearing rotor 9 → fifth radial magnetic pole 85 → radial stator yoke 1 → fourth radial magnetic pole 84 (cycle 3). The number of three cycles is one-fourth of the number of radial bearing stator magnetic poles (radial stator poles 8), and the number of radial stator poles 8 is a, a is an even number and a multiple of 4, and the preferred number of the present invention is 16.

[0083] The flow direction of the axial bearing magnetic circuit of this structure is: section A, first axial iron core 6 → twelfth radial magnetic pole 812 → bearing rotor 9 → first axial iron core 6 (circulation); section B, first axial iron core 6 → third radial magnetic pole 83 → bearing rotor 9 → first axial iron core 6 (circulation), and the same applies to other sections.

[0084] The first axial stator unit 61 has a magnetic pole covering the first radial magnetic pole 81 and the second radial magnetic pole 82; the second axial stator unit 62 has a magnetic pole covering the third radial magnetic pole 83; the third axial stator unit 63 has a magnetic pole covering the fourth radial magnetic pole 84; the fourth axial stator unit 64 has a magnetic pole covering the fifth radial magnetic pole 85 and the sixth radial magnetic pole 86; the fifth axial stator unit 65 has a magnetic pole covering the seventh radial magnetic pole 87; the sixth axial stator unit 66 has a magnetic pole covering the eighth radial magnetic pole 88; the seventh axial stator unit The 67 magnetic poles cover the ninth radial magnetic pole 89 and the tenth radial magnetic pole 810; the eighth axial stator unit 68 magnetic poles cover the eleventh radial magnetic pole 811; the ninth axial stator unit 69 magnetic poles cover the twelfth radial magnetic pole 812; the tenth axial stator unit 610 magnetic poles cover the thirteenth radial magnetic pole 813 and the fourteenth radial magnetic pole 814; the eleventh axial stator unit 611 magnetic poles cover the fifteenth radial magnetic pole 815; the twelfth axial stator unit 612 magnetic poles cover the sixteenth radial magnetic pole 816.

[0085] When the bearing is controlled, the radial and axial directions can still be controlled separately. The method is simple and the radial movement of the shaft can be controlled in a wide range of directions. The three-degree-of-freedom magnetic bearing integrates the radial bearing and the axial bearing, shortens the rotor length, increases the critical speed of the rotor, divides the axial bearing magnetic pole into blocks, avoids the leakage of the radial magnetic circuit on the outer circle of the axial stator, enhances the air gap magnetic field on the radial magnetic pole, and realizes stable suspension in the radial direction.

[0086] In some embodiments, the first axial stator 300 includes a first axial core 6 and a first axial winding 7, the first axial core 6 is an annular structure, the first axial core 6 includes a first main body 6a, a first annular portion 6b and a second annular portion 6c, the first main body 6a is a disc structure with a first center hole, the first center hole accommodates the rotating shaft 2 passing therethrough, the second annular portion 6c is located radially outside the first annular portion 6b, one end of the first annular portion 6b is connected to the first main body 6a and the other end extends toward the direction of the bearing rotor 9 to be opposite to the bearing rotor 9, one end of the second annular portion 6c is connected to the first main body 6a and the other end extends toward the direction of the radial core 10 to be opposite to the radial core 10, so as to form a first accommodating groove 6d between the radial outer side of the first annular portion 6b and the radial inner side of the second annular portion 6c, and the first axial winding 7 is wound on the second annular portion 6c.

[0087] This is the preferred structural form of the first axial stator of the present invention. A first accommodating groove for accommodating the first axial winding can be formed by the first annular portion and the second annular portion, and the first annular portion is opposite to the bearing rotor to accommodate the passage of the magnetic circuit, and the second annular portion is opposite to the radial iron core. The radial iron core and the second annular portion can be effectively improved so that the second annular portion, the radial iron core, the bearing rotor, the first annular portion and the first main body form a closed-loop magnetic path. Such a structure can enable the first axial stator to provide a radial bias magnetic flux for the radial stator, so that the first axial stator and the radial stator are integrated into an integrated structure, effectively eliminating structures such as the thrust plate, the permanent magnet, and the bias stator. The structure is compact and the volume is effectively reduced.

[0088] In some embodiments, the first annular portion 6b extends in the axial direction of the rotating shaft 2 and is spaced from the bearing rotor 9 by a third preset distance, forming a first axial working gap 16; the second annular portion 6c also extends in the axial direction of the rotating shaft 2 and is spaced from the radial core 10 by a fourth preset distance, forming a second axial working gap 19. This is a preferred structural form of the first annular portion and the second annular portion of the present invention, that is, the first annular portion extends in the axial direction and forms a first axial working gap with the bearing rotor, so that a magnetic flux can pass between the first annular portion and the bearing rotor, and the first annular portion does not rotate with the bearing rotor, and the second annular portion is spaced from the radial core by a second axial working gap, so that a magnetic flux can pass between the second annular portion and the radial core, and the second annular portion does not form friction or magnetic leakage with the radial stator.

[0089] In some embodiments, the second axial stator 400 includes a second axial core 11 and a second axial winding 12, the second axial core 11 is an annular structure, the second axial core 11 includes a second main body portion 11a, a third annular portion 11b and a fourth annular portion 11c, the second main body portion 11a is a disc structure with a second center hole, the second center hole accommodates the rotating shaft 2 passing therethrough, one end of the third annular portion 11b is connected to the second main body portion 11a and the other end extends toward the direction of the bearing rotor 9 to be opposite to the bearing rotor 9, one end of the fourth annular portion 11c is connected to the second main body portion 11a and the other end extends toward the direction of the radial core 10 to be opposite to the radial core 10, and the fourth annular portion 11c is located radially outside the third annular portion 11b to form a second accommodating groove 11d between the radial outer side of the third annular portion 11b and the radial inner side of the fourth annular portion 11c, and the second axial winding 12 is wound on the fourth annular portion 11c.

[0090] This is the preferred structural form of the second axial stator of the present invention. The second accommodating groove for accommodating the second axial winding can be formed by the third annular portion and the fourth annular portion, and the third annular portion is opposite to the bearing rotor to accommodate the passage of the magnetic circuit, and the fourth annular portion is opposite to the radial iron core. The radial iron core and the fourth annular portion can be effectively improved, so that the fourth annular portion, the radial iron core, the bearing rotor, the third annular portion and the second main body form a closed-loop magnetic path, and such a structure can enable the second axial stator to provide a radial bias magnetic flux for the radial stator, so that the second axial stator and the radial stator are integrated into an integrated structure, effectively eliminating structures such as the thrust plate, permanent magnet, and bias stator, and the structure is compact and the volume is effectively reduced.

[0091] In some embodiments, the third annular portion 11b extends in the axial direction of the rotating shaft 2 and is spaced apart from the bearing rotor 9 by a fifth preset distance, forming a first axial working gap 16; the fourth annular portion 11c also extends in the axial direction of the rotating shaft 2 and is spaced apart from the radial iron core 10 by a sixth preset distance, forming a second axial working gap 19. This is a preferred structural form of the third annular portion and the fourth annular portion of the present invention, that is, the third annular portion extends in the axial direction and forms a first axial working gap with the bearing rotor, so that a magnetic flux can pass between the third annular portion and the bearing rotor, and the third annular portion does not rotate with the bearing rotor, and the fourth annular portion is spaced apart from the radial iron core by a second axial working gap, so that a magnetic flux can pass between the fourth annular portion and the radial iron core, and the fourth annular portion does not form friction or magnetic leakage with the radial stator.

[0092] In some embodiments, the first axial winding 7 and the second axial winding 12 are energized in opposite directions; the radial winding 5 is located radially outside the second annular portion 6c and the fourth annular portion 11c at the same time, and the second annular portion 6c and the fourth annular portion 11c are opposite to the radial stator pole 8. The present invention also arranges the radial winding radially outside the first axial core and the second axial core, and the second annular portion and the fourth annular portion are opposite to the radial stator pole. Compared with the existing solution in which the upper magnetic pole of the axial stator is located next to the radial stator yoke (that is, the upper magnetic pole of the existing axial stator is located on the axial side of the radial stator yoke), it can effectively reduce the leakage magnetic flux of the radial magnetic circuit in the axial direction and effectively prevent the circumferential non-uniformity of the axial output.

[0093] The present invention also provides a motor, comprising the magnetically suspended active three-degree-of-freedom bearing as described in any of the preceding items.

[0094] Beneficial effects of the present invention:

[0095] 1. The 16-grade radial bearing is used, which has simple processing and manufacturing technology and convenient radial magnetic circuit control. The axial stator magnetic pole adopts a block structure to avoid the leakage of radial magnetic circuit on the outer circle of the axial stator, and only enhance the air gap magnetic field on the radial magnetic pole.

[0096] 2. No permanent magnets, low cost, easy assembly, large bearing capacity, and high-power operation; high radial and axial integration, no thrust plate, reduced cost, compact structure, simple process, high critical speed, and stable performance.

[0097] The present invention also provides a compressor, comprising the magnetically suspended active three-degree-of-freedom bearing as described in any of the preceding items.

[0098] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment 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. 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: include: An axial magnetic bearing (100), a radial magnetic bearing (200) and a bearing rotor (9), wherein the axial magnetic bearing (100) and the radial magnetic bearing (200) are both sleeved on the outer circumference of a rotating shaft (2), the axial magnetic bearing (100) comprises a first axial stator (300) and a second axial stator (400), the radial magnetic bearing (200) comprises a radial stator (500), the bearing rotor (9) is sleeved on the outer circumference of the rotating shaft (2) and can rotate along with the rotating shaft (2), and the radial stator (500) is located on the outer circumference of the bearing rotor (9) and can exert a radial electromagnetic force on the bearing rotor (9). , along the axial direction of the rotating shaft (2), at least a portion of the structure of the first axial stator (300) is located at one axial end of the bearing rotor (9), and at least a portion of the structure of the second axial stator (400) is located at the other axial end of the bearing rotor (9), the first axial stator (300) and the second axial stator (400) can apply axial electromagnetic force to the bearing rotor (9), so that the bias magnetic flux of the radial magnetic bearing (200) is provided by the axial magnetic bearing (100), and the first axial stator (300) and the second axial stator (400) are both block structures arranged at intervals along the circumferential direction; The radial stator (500) comprises a radial core (10) and a radial winding (5); the radial core (10) is an annular structure and is sleeved on the radial outer side of the bearing rotor (9); the radial core (10) comprises a radial stator yoke (1) and a radial stator pole (8); the radial stator yoke (1) is an annular structure; the radial outer end of the radial stator pole is connected to the radial stator yoke (1), the radial inner end protrudes toward the bearing rotor (9) and has a radial working gap (15) with the bearing rotor (9); each radial stator pole is wound with the radial winding (5); the number of the radial stator poles is 16, forming a radial 16-pole stator.

2. The magnetically suspended active three-degree-of-freedom bearing according to claim 1, characterized in that: The first axial stator (300) and the second axial stator (400) have the same structure, and both include a first axial stator unit (61), a second axial stator unit (62), a third axial stator unit (63), a fourth axial stator unit (64), a fifth axial stator unit (65), a sixth axial stator unit (66), a seventh axial stator unit (67), an eighth axial stator unit (68), a ninth axial stator unit (69), a tenth axial stator unit (610), an eleventh axial stator unit (611), and a twelfth axial stator unit (612) which are arranged in sequence and spaced apart in the circumferential direction.

3. The magnetically suspended active three-degree-of-freedom bearing according to claim 2, characterized in that: In a radial cross section, the radial stator (500) comprises a first quadrant portion located at the upper right, a second quadrant portion located at the upper left, a third quadrant portion located at the lower left, and a fourth quadrant portion located at the lower right, the first quadrant portion, the second quadrant portion, the third quadrant portion, and the fourth quadrant portion are sequentially connected in a counterclockwise direction, the first quadrant portion forms a diagonal with the third quadrant portion, and the second quadrant portion forms a diagonal with the fourth quadrant portion.

4. The magnetically suspended active three-degree-of-freedom bearing according to claim 3, characterized in that: The radial stator pole (8) includes a second radial magnetic pole (82), a third radial magnetic pole (83), a fourth radial magnetic pole (84) and a fifth radial magnetic pole (85) located in the first quadrant part, and the radial stator pole (8) also includes a sixth radial magnetic pole (86), a seventh radial magnetic pole (87), an eighth radial magnetic pole (88) and a ninth radial magnetic pole (89) located in the fourth quadrant part, and the radial stator pole (8) also includes a tenth radial magnetic pole (810), an eleventh radial magnetic pole (811), a twelfth radial magnetic pole (812) and a thirteenth radial magnetic pole (813) located in the third quadrant part, and the radial stator pole (8) also includes a fourteenth radial magnetic pole (814), a fifteenth radial magnetic pole (815), a sixteenth radial magnetic pole (816) and the first radial magnetic pole (81) located in the second quadrant part.

5. The magnetically suspended active three-degree-of-freedom bearing according to claim 4, characterized in that: Along the circumferential direction of the radial stator, the second radial magnetic pole (82), the third radial magnetic pole (83), the fourth radial magnetic pole (84) and the fifth radial magnetic pole (85) are arranged in sequence, and the circumferential width of the third radial magnetic pole (83) is equal to the circumferential width of the fourth radial magnetic pole (84), the circumferential width of the second radial magnetic pole (82) is equal to the circumferential width of the fifth radial magnetic pole (85), and the circumferential width of the third radial magnetic pole (83) is greater than the circumferential width of the second radial magnetic pole (82); Along the circumferential direction of the radial stator, the sixth radial magnetic pole (86), the seventh radial magnetic pole (87), the eighth radial magnetic pole (88) and the ninth radial magnetic pole (89) are arranged in sequence, and the circumferential width of the seventh radial magnetic pole (87) is equal to the circumferential width of the eighth radial magnetic pole (88), the circumferential width of the sixth radial magnetic pole (86) is equal to the circumferential width of the ninth radial magnetic pole (89), and the circumferential width of the seventh radial magnetic pole (87) is greater than the circumferential width of the sixth radial magnetic pole (86); Along the circumferential direction of the radial stator, the tenth radial magnetic pole (810), the eleventh radial magnetic pole (811), the twelfth radial magnetic pole (812) and the thirteenth radial magnetic pole (813) are arranged in sequence, and the circumferential width of the eleventh radial magnetic pole (811) is equal to the circumferential width of the twelfth radial magnetic pole (812), the circumferential width of the tenth radial magnetic pole (810) is equal to the circumferential width of the thirteenth radial magnetic pole (813), and the circumferential width of the eleventh radial magnetic pole (811) is greater than the circumferential width of the tenth radial magnetic pole (810); Along the circumferential direction of the radial stator, the fourteenth radial magnetic pole (814), the fifteenth radial magnetic pole (815), the sixteenth radial magnetic pole (816) and the first radial magnetic pole (81) are arranged in sequence, and the circumferential width of the fifteenth radial magnetic pole (815) is equal to the circumferential width of the sixteenth radial magnetic pole (816), the circumferential width of the fourteenth radial magnetic pole (814) is equal to the circumferential width of the first radial magnetic pole (81), and the circumferential width of the fifteenth radial magnetic pole (815) is greater than the circumferential width of the fourteenth radial magnetic pole (814).

6. The magnetically suspended active three-degree-of-freedom bearing according to claim 5, characterized in that: The magnetic circuits inside the second radial magnetic pole (82), the bearing rotor (9), the third radial magnetic pole (83) and the radial stator yoke (1) are also connected to form a closed-loop radial bearing magnetic circuit (3); the magnetic circuits inside the third radial magnetic pole (83), the bearing rotor (9), the fourth radial magnetic pole (84) and the radial stator yoke (1) are also connected to form a closed-loop radial bearing magnetic circuit (3); the magnetic circuits inside the fourth radial magnetic pole (84), the bearing rotor (9), the fifth radial magnetic pole (85) and the radial stator yoke (1) are also connected to form a closed-loop radial bearing magnetic circuit (3); The sixth radial magnetic pole (86), the bearing rotor (9), the seventh radial magnetic pole (87) and the magnetic circuit inside the radial stator yoke (1) are also connected to form a closed-loop radial bearing magnetic circuit (3); the seventh radial magnetic pole (87), the bearing rotor (9), the eighth radial magnetic pole (88) and the magnetic circuit inside the radial stator yoke (1) are also connected to form a closed-loop radial bearing magnetic circuit (3); the eighth radial magnetic pole (88), the bearing rotor (9), the ninth radial magnetic pole (89) and the magnetic circuit inside the radial stator yoke (1) are also connected to form a closed-loop radial bearing magnetic circuit (3); The magnetic circuits inside the tenth radial magnetic pole (810), the bearing rotor (9), the eleventh radial magnetic pole (811) and the radial stator yoke (1) are also connected to form a closed-loop radial bearing magnetic circuit (3); the magnetic circuits inside the eleventh radial magnetic pole (811), the bearing rotor (9), the twelfth radial magnetic pole (812) and the radial stator yoke (1) are also connected to form a closed-loop radial bearing magnetic circuit (3); the magnetic circuits inside the twelfth radial magnetic pole (812), the bearing rotor (9), the thirteenth radial magnetic pole (813) and the radial stator yoke (1) are also connected to form a closed-loop radial bearing magnetic circuit (3); The magnetic circuits inside the fourteenth radial magnetic pole (814), the bearing rotor (9), the fifteenth radial magnetic pole (815) and the radial stator yoke (1) are also connected to form a closed-loop radial bearing magnetic circuit (3); the magnetic circuits inside the fifteenth radial magnetic pole (815), the bearing rotor (9), the sixteenth radial magnetic pole (816) and the radial stator yoke (1) are also connected to form a closed-loop radial bearing magnetic circuit (3); the magnetic circuits inside the sixteenth radial magnetic pole (816), the bearing rotor (9), the first radial magnetic pole (81) and the radial stator yoke (1) are also connected to form a closed-loop radial bearing magnetic circuit (3).

7. The magnetically suspended active three-degree-of-freedom bearing according to claim 6, characterized in that: The first axial stator unit (61) is opposite to the first radial magnetic pole (81) in the second quadrant part and the second radial magnetic pole (82) in the first quadrant part, and a bias magnetic circuit is provided to the first radial magnetic pole (81) and the second radial magnetic pole (82) through the first axial stator unit (61); the second axial stator unit (62) is opposite to the third radial magnetic pole (83) in the first quadrant part, and a bias magnetic circuit is provided to the third radial magnetic pole (83) through the second axial stator unit (62); the third axial stator unit (63) is opposite to the fourth radial magnetic pole (84) in the first quadrant part, and a bias magnetic circuit is provided to the fourth radial magnetic pole (84) through the third axial stator unit (63); The fourth axial stator unit (64) is opposite to the fifth radial magnetic pole (85) in the first quadrant part and the sixth radial magnetic pole (86) in the fourth quadrant part, and a bias magnetic circuit is provided for the fifth radial magnetic pole (85) and the sixth radial magnetic pole (86) through the fourth axial stator unit (64); the fifth axial stator unit (65) is opposite to the seventh radial magnetic pole (87) in the fourth quadrant part, and a bias magnetic circuit is provided for the seventh radial magnetic pole (87) through the fifth axial stator unit (65); the sixth axial stator unit (66) is opposite to the eighth radial magnetic pole (88) in the fourth quadrant part, and a bias magnetic circuit is provided for the eighth radial magnetic pole (88) through the sixth axial stator unit (66); The seventh axial stator unit (67) is opposite to the ninth radial magnetic pole (89) in the fourth quadrant part and the tenth radial magnetic pole (810) in the third quadrant part, and a bias magnetic circuit is provided to the ninth radial magnetic pole (89) and the tenth radial magnetic pole (810) through the seventh axial stator unit (67); the eighth axial stator unit (68) is opposite to the eleventh radial magnetic pole (811) in the third quadrant part, and a bias magnetic circuit is provided to the eleventh radial magnetic pole (811) through the eighth axial stator unit (68); the ninth axial stator unit (69) is opposite to the twelfth radial magnetic pole (812) in the third quadrant part, and a bias magnetic circuit is provided to the twelfth radial magnetic pole (812) through the ninth axial stator unit (69); The tenth axial stator unit (610) is opposite to the thirteenth radial magnetic pole (813) in the third quadrant part and the fourteenth radial magnetic pole (814) in the second quadrant part, and a bias magnetic circuit is provided to the thirteenth radial magnetic pole (813) and the fourteenth radial magnetic pole (814) through the tenth axial stator unit (610); the eleventh axial stator unit (611) is opposite to the fifteenth radial magnetic pole (815) in the second quadrant part, and a bias magnetic circuit is provided to the fifteenth radial magnetic pole (815) through the eleventh axial stator unit (611); the twelfth axial stator unit (612) is opposite to the sixteenth radial magnetic pole (816) in the second quadrant part, and a bias magnetic circuit is provided to the sixteenth radial magnetic pole (816) through the twelfth axial stator unit (612).

8. The magnetically suspended active three-degree-of-freedom bearing according to claim 7, characterized in that: The bias magnetic circuits provided by the first axial stator unit (61) to the first radial magnetic pole (81) and the second radial magnetic pole (82) are both directed in a radial direction toward the center of the rotating shaft (2); the bias magnetic circuit provided by the second axial stator unit (62) to the third radial magnetic pole (83) is directed away from the center of the rotating shaft (2) in a radial direction; and the bias magnetic circuit provided by the third axial stator unit (63) to the fourth radial magnetic pole (84) is directed in a radial direction toward the center of the rotating shaft (2); The bias magnetic circuits provided by the fourth axial stator unit (64) to the fifth radial magnetic pole (85) and the sixth radial magnetic pole (86) are both directed away from the center of the rotating shaft (2) in a radial direction; the bias magnetic circuit provided by the fifth axial stator unit (65) to the seventh radial magnetic pole (87) is directed toward the center of the rotating shaft (2) in a radial direction; and the bias magnetic circuit provided by the sixth axial stator unit (66) to the eighth radial magnetic pole (88) is directed away from the center of the rotating shaft (2) in a radial direction; The bias magnetic circuits provided by the seventh axial stator unit (67) for the ninth radial magnetic pole (89) and the tenth radial magnetic pole (810) are both directed in a radial direction toward the center of the rotating shaft (2); the bias magnetic circuit provided by the eighth axial stator unit (68) for the eleventh radial magnetic pole (811) is directed away from the center of the rotating shaft (2) in a radial direction; and the bias magnetic circuit provided by the ninth axial stator unit (69) for the twelfth radial magnetic pole (812) is directed in a radial direction toward the center of the rotating shaft (2); The bias magnetic circuits provided by the tenth axial stator unit (610) to the thirteenth radial magnetic pole (813) and the fourteenth radial magnetic pole (814) are both away from the center of the rotating shaft (2) in the radial direction; the bias magnetic circuit provided by the eleventh axial stator unit (611) to the fifteenth radial magnetic pole (815) is toward the center of the rotating shaft (2) in the radial direction; and the bias magnetic circuit provided by the twelfth axial stator unit (612) to the sixteenth radial magnetic pole (816) is away from the center of the rotating shaft (2) in the radial direction.

9. The magnetically suspended active three-degree-of-freedom bearing according to any one of claims 1 to 8, characterized in that: The first axial stator (300) comprises a first axial core (6) and a first axial winding (7); the first axial core (6) is an annular structure; the first axial core (6) comprises a first main body portion (6a), a first annular portion (6b) and a second annular portion (6c); the first main body portion (6a) is a disc structure having a first central hole; the first central hole accommodates the rotating shaft (2) passing therethrough; the second annular portion (6c) is located radially outside the first annular portion (6b); one end of the first annular portion (6b) is The first annular portion (6c) is connected to the first main body portion (6a) and the other end extends in the direction of the bearing rotor (9) to be opposite to the bearing rotor (9); one end of the second annular portion (6c) is connected to the first main body portion (6a) and the other end extends in the direction of the radial iron core (10) to be opposite to the radial iron core (10), so as to form a first accommodating groove (6d) between the radial outer side of the first annular portion (6b) and the radial inner side of the second annular portion (6c); the first axial winding (7) is wound on the second annular portion (6c).

10. The magnetically suspended active three-degree-of-freedom bearing according to claim 9, characterized in that: The first annular portion (6b) extends along the axial direction of the rotating shaft (2) and is spaced from the bearing rotor (9) by a third preset distance, thereby forming a first axial working gap (16); the second annular portion (6c) also extends along the axial direction of the rotating shaft (2) and is spaced from the radial iron core (10) by a fourth preset distance, thereby forming a second axial working gap (19).

11. The magnetically suspended active three-degree-of-freedom bearing according to claim 9, characterized in that: The second axial stator (400) comprises a second axial core (11) and a second axial winding (12); the second axial core (11) is an annular structure; the second axial core (11) comprises a second main body portion (11a), a third annular portion (11b) and a fourth annular portion (11c); the second main body portion (11a) is a disc structure having a second center hole; the second center hole accommodates the shaft (2) passing therethrough; one end of the third annular portion (11b) is connected to the second main body portion (11a) and the other end faces the bearing rotor (9); The fourth annular portion (11c) is provided with a radially outer portion and a radially inner portion, and the second axial winding (12) is wound on the fourth annular portion (11c).

12. The magnetically suspended active three-degree-of-freedom bearing according to claim 11, characterized in that: The third annular portion (11b) extends along the axial direction of the rotating shaft (2) and is spaced from the bearing rotor (9) by a fifth preset distance, thereby forming a first axial working gap (16); the fourth annular portion (11c) also extends along the axial direction of the rotating shaft (2) and is spaced from the radial iron core (10) by a sixth preset distance, thereby forming a second axial working gap (19).

13. The magnetically suspended active three-degree-of-freedom bearing according to claim 11, characterized in that: The first axial winding (7) and the second axial winding (12) are energized in opposite directions; the radial winding (5) is located radially outside the second annular portion (6c) and the fourth annular portion (11c), and the second annular portion (6c) and the fourth annular portion (11c) are both opposite to the radial stator pole (8).

14. A motor, characterized in that: A magnetically suspended active three-degree-of-freedom bearing comprising any one of claims 1-13.

15. A compressor, characterized in that: A magnetically suspended active three-degree-of-freedom bearing comprising any one of claims 1-13.

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