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

Abstract

The present application provides a magnetically suspended active three-degree-of-freedom bearing, motor and compressor, including a rotating shaft, a bearing rotor, a radial stator, and a first axial stator and a second axial stator, wherein the radial stator has 16 poles extending toward one side of the bearing rotor; the 16 poles are centrally symmetrical about the center of the rotating shaft and are distributed in 4 quadrants, each quadrant having two middle poles and two side poles on both sides of the middle poles; the circumferential width of the middle poles is greater than the circumferential width of the side poles; the first axial stator and the second axial stator are respectively arranged on both axial sides of the bearing rotor, and the first axial stator, the second axial stator and the bearing rotor enclose a receiving space, and the radial stator is located in the receiving space. The present application does not require a thrust plate to be assembled separately on the rotating shaft, the structure is more compact, the process is simplified, the bearing volume is effectively reduced, the rotating shaft length is shortened, the critical speed of the rotor is increased, and the operating stability of the magnetic suspension system is improved.

Description

Technical Field

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

[0002] At present, magnetic bearings (abbreviated as 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] Magnetic bearings are divided into radial magnetic bearings and axial magnetic bearings. The radial magnetic bearing adjusts the radial position of the shaft through the electromagnetic force between the radial rotor and the radial rotor, and the axial magnetic bearing adjusts the axial position of the shaft through the electromagnetic force between the thrust plate on the shaft. In a magnetic suspension system, radial magnetic bearings and axial magnetic bearings are configured at both ends of the shaft to adjust the three-degree-of-freedom direction position of the shaft.

[0004] However, in the related art, a thrust plate needs to be installed, so the radial and axial dimensions of the stator are large and the rotor is long, which makes the processing and manufacturing process complicated and the product size large, thereby affecting the stability and applicability of the magnetic levitation system.

[0005] Therefore, how to provide a magnetic levitation active three-degree-of-freedom bearing, motor and compressor that can reduce the radial and axial stator dimensions and shorten the rotor length, increase the critical speed of the rotor, and improve the stability and applicability of the magnetic levitation system has become an urgent problem that technical personnel in this field need to solve. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present application is to provide a magnetically suspended active three-degree-of-freedom bearing, motor and compressor, which can reduce the radial and axial stator dimensions and shorten the rotor length, increase the critical speed of the rotor, and improve the stability and applicability of the magnetic suspension system.

[0007] In order to solve the above problems, the present application provides a magnetically suspended active three-degree-of-freedom bearing, including a rotating shaft, a bearing rotor, a radial stator, a first axial stator and a second axial stator, the bearing rotor is sleeved on the rotating shaft; the radial stator is sleeved outside the bearing rotor; the radial stator has 16 poles extending toward one side of the bearing rotor; on the cross section of the rotating shaft, the 16 poles are centrally symmetrical about the center of the rotating shaft and are distributed in 4 quadrants, each quadrant has two middle poles and two side poles on both sides of the middle poles; the two middle poles are symmetrical about the angular bisector of the corresponding quadrant; the two side poles are symmetrical about the angular bisector of the corresponding quadrant The invention is symmetrical about the bisector; the circumferential width of the middle pole is greater than the circumferential width of the side pole; the first axial stator and the second axial stator are sleeved outside the rotating shaft, and the first axial stator and the second axial stator are respectively arranged on both axial sides of the bearing rotor, and the first axial stator, the second axial stator and the bearing rotor enclose a receiving space, and the radial stator is located in the receiving space; the first axial stator assembly and the second axial stator assembly respectively form an axial magnetic circuit with the bearing rotor and the radial stator assembly to adjust the axial position of the bearing rotor, and a radial magnetic circuit is formed between the radial stator assembly and the bearing rotor to adjust the radial position of the bearing rotor.

[0008] Furthermore, the magnetically suspended active three-degree-of-freedom bearing also includes an axial winding; the axial winding is arranged in the first axial stator and the second axial stator; the axial winding is circumferentially wound around the rotating shaft.

[0009] Furthermore, each pole is wound with a radial coil, the radial coils wound with two side poles are connected in series, and the radial coils wound with two middle poles are connected in series.

[0010] Further, the first axial stator assembly includes a first axial stator, the first axial stator has a first inner magnetic ring and a first outer magnetic ring, the axial winding is located between the first inner magnetic ring and the first outer magnetic ring, wherein a first axial inner working gap is formed between the first inner magnetic ring and the left end face of the bearing rotor, a first axial outer working gap is formed between the first outer magnetic ring and the left end face of the radial stator, and the first outer magnetic ring is located radially outside the radial coil.

[0011] Further, the second axial stator assembly includes a second axial stator, the second axial stator has a second inner magnetic ring and a second outer magnetic ring, the axial winding is located between the second inner magnetic ring and the second outer magnetic ring, wherein a second axial inner working gap is formed between the second inner magnetic ring and the right end face of the bearing rotor, a second axial outer working gap is formed between the second outer magnetic ring and the right end face of the radial stator, and the second outer magnetic ring is located radially outside of the radial coil.

[0012] Furthermore, the first axial stator also includes a first connecting section, which connects the first inner magnetic ring and the first outer magnetic ring; the second axial stator also includes a second connecting section, which connects the second inner magnetic ring and the second outer magnetic ring; the first inner magnetic ring and the second inner magnetic ring are respectively located on both axial sides of the bearing rotor, and the first outer magnetic ring and the second outer magnetic ring are in contact, so that an accommodation space is enclosed between the first axial stator, the second axial stator and the bearing rotor; the axial winding is arranged in the accommodation space and is located on both axial sides of the radial stator.

[0013] Furthermore, the control of the radial coils wound on the middle poles in each quadrant is independent of the control of the radial coils wound on the side poles.

[0014] Further, the current flowing through the axial windings in the first axial stator component is opposite to the current flowing through the axial windings in the second axial stator component.

[0015] The present application also provides a motor, comprising the above-mentioned magnetically suspended active three-degree-of-freedom bearing.

[0016] The present application also provides a compressor, comprising the above-mentioned motor.

[0017] The present application provides a magnetically suspended active three-degree-of-freedom bearing, motor and compressor, which do not require a thrust plate to be separately assembled on the rotating shaft, and the overall structure and processing technology are simplified, which is easy to assemble, has a high degree of integration, and a more compact structure, which effectively reduces the volume of the bearing, shortens the length of the rotating shaft, increases the critical speed of the rotor, and improves the operating stability of the magnetic suspension system; the present application can reduce the radial and axial stator dimensions and shorten the rotor length, increase the critical speed of the rotor, and improve the stability and applicability of the magnetic suspension system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the internal structure of a magnetically suspended active three-degree-of-freedom bearing according to an embodiment of the present application, wherein the dotted arrows in the figure indicate the flow direction of the axial magnetic circuit;

[0019] Figure 2 for Figure 1 The relative position relationship between the radial stator and the bearing rotor in the figure. The dotted arrows in the figure show the flow direction of the axial magnetic circuit, and the solid arrows in the figure show the flow direction of the radial magnetic circuit.

[0020] The reference numerals are:

[0021] 1. Bearing rotor; 10. Rotating shaft; 21. Radial stator; 211. Middle pole; 212. Side pole; 213. Stator yoke; 214. Stator pole; 31. First axial stator; 311. First inner magnetic ring; 312. First outer magnetic ring; 41. Second axial stator; 411. Second inner magnetic ring; 412. Second outer magnetic ring; 51. Axial winding; 52. Radial coil; 001. Axial magnetic circuit; 002. Radial magnetic circuit; 003. Radial working gap; 004. First axial inner working gap; 005. Second axial inner working gap. DETAILED DESCRIPTION

[0022] See also Figure 1 to Figure 2 As shown, a magnetic suspension active three-degree-of-freedom bearing includes a rotating shaft 10, a bearing rotor 1, a radial stator 21, a first axial stator 31, and a second axial stator 41. The bearing rotor 1 is sleeved on the rotating shaft 10; the radial stator 21 is sleeved outside the bearing rotor 1; the radial stator 21 has 16 poles extending toward one side of the bearing rotor 1; on the cross section of the rotating shaft 10, the 16 poles are centrally symmetrical about the center of the rotating shaft 10 and distributed in 4 quadrants, each quadrant has two middle poles 211 and two side poles 212 on both sides of the middle pole 211; the two middle poles 211 are symmetrical about the angular bisector of the corresponding quadrant; the two side poles 212 are symmetrical about the angular bisector of the corresponding quadrant; The circumferential width of the middle pole 211 is greater than the circumferential width of the side pole 212; the first axial stator 31 and the second axial stator 41 are sleeved outside the rotating shaft 10, and the first axial stator 31 and the second axial stator 41 are respectively arranged on both axial sides of the bearing rotor 1, and the first axial stator 31, the second axial stator 41 and the bearing rotor 1 enclose a receiving space, and the radial stator 21 is located in the receiving space; the first axial stator assembly and the second axial stator assembly respectively form an axial magnetic circuit 001 with the bearing rotor 1 and the radial stator 21 assembly to adjust the axial position of the bearing rotor 1, and the radial stator 21 assembly forms a radial magnetic circuit 002 with the bearing rotor 1 to adjust the radial position of the bearing rotor 1. The radial stator 21 also includes a stator pole 214.

[0023] The active three-degree-of-freedom magnetic bearing proposed in this application removes the thrust plate and replaces it with a bearing rotor 1, 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 the 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.

[0024] The present application integrates radial bearings and axial bearings, has no thrust plate, has a compact structure, greatly reduces the radial and axial stator dimensions and shortens the rotor length, increases the critical speed of the rotor, and improves the stability and applicability of the magnetic suspension system.

[0025] Compared with the case where the axial magnetic poles are located next to the poles of the radial stator 21, the process of the present application can greatly shorten the outer diameter of the radial stator 21 and the thickness of the axial stator under the same axial output conditions, thereby reducing the volume of the bearing stator.

[0026] This application adopts 16-grade radial bearings, which have simple processing and manufacturing processes, and convenient control of radial magnetic circuit 002. This application has no permanent magnets, low cost, easy assembly, large bearing capacity, and can operate at high power. This application has high radial and axial integration, no thrust plate, reduced costs, compact structure, simple process, high critical speed, and stable performance.

[0027] The four poles in each quadrant include two middle poles 211 and two side poles 212 on both sides of the middle pole 211. The two middle poles 211 and the two side poles 212 are symmetrical about the angular bisector of the corresponding quadrant. In the same quadrant, the polarities formed by the adjacent side poles 212 and the middle pole 211 are opposite. One side pole 212, two middle poles 211 and another side pole 212 form a Shape structure.

[0028] The aforementioned four quadrants specifically refer to the center of the rotating shaft 1010 as the coordinate origin O, and the orthogonal coordinate system XOY is established through the O point. The orthogonal coordinate system XOY divides the aforementioned axial projection into four adjacent quadrants. This aspect is basic geometric knowledge and will not be elaborated. In this technical solution, the bearing rotor 1 is used as a conducting component of the axial magnetic circuit 001 and the radial magnetic circuit 002 at the same time, and the thrust plate and the bearing rotor 1 in the prior art are integrated into one, and the integration degree of the bearing is further improved. There is no need to assemble the thrust plate separately on the rotating shaft 1010, and the bearing rotor 1 is a magnetic circuit shared by the radial stator 21 component and the axial stator component. The overall structure and processing and manufacturing process are simplified, which is convenient for assembly, has a high degree of integration, and a more compact structure. The bearing volume is effectively reduced, the length of the rotating shaft 10 is shortened, the critical speed of the rotor is increased, and the operating stability of the magnetic suspension system is improved.

[0029] Specific combination Figure 2As shown, the aforementioned four quadrants are respectively the first quadrant on the upper right, the second quadrant on the upper left, the third quadrant on the lower left, and the fourth quadrant on the lower right. Taking the three poles in the first quadrant as an example, the energizing direction of each radial coil 52 shown in the figure is used as the standard, wherein the free ends of the middle pole 211 present an S pole (upper left) and the other present an N pole (lower right), the free end of one side pole 212 presents an N pole, and the other side pole 212 presents an S pole. The flow direction of the radial magnetic circuit 002 in the upper left side pole 212 and the lower right middle pole 211 is the same as the flow direction of the axial magnetic circuit 001, so that the magnetic field between the two poles and the bearing rotor 1 can be increased. The radial force at these two places is increased, while in the upper left middle pole 211 and the lower right side pole 212, the flow directions of the radial magnetic circuit 002 and the axial magnetic circuit 001 are opposite, thus weakening the magnetic flux between the two poles and the bearing rotor 1, thereby reducing the radial force at these places. The aforementioned content is aimed at the influence of the axial magnetic flux on the poles in one quadrant, and the enhancement and weakening of the radial magnetic flux in the four quadrants offset each other. Although the radial magnetic circuit 002 and the axial magnetic circuit 001 of the integrated magnetic bearing both flow through the bearing rotor 1, the change of the axial magnetic circuit 001 will not affect the radial magnetic circuit 002 as a whole, thereby simplifying the control of the magnetic bearing.

[0030] See also Figure 2 As shown, the middle pole 211 also serves as a flow component for the magnetic lines of force in the side poles 212. The circumferential width of the middle pole 211 is designed to be larger than the circumferential width of the two adjacent poles, so that the magnetic circuits on both sides can be optimized. At the same time, the middle pole 211 is connected in series with the side poles 212 to ensure that the radial control turns and the radial current are consistent, so that only one current needs to be adjusted to control the radial movement. This control method is simple, ensuring that the radial magnetic flux of the middle pole 211 is greater than that of the two ends, the radial magnetic flux on the four poles is consistent and the magnetic circuit is not easy to saturate. At the same time, the influence of the middle axial magnetic circuit 001 can also be taken into account, and the axial magnetic flux on the four poles is consistent and the magnetic circuit is not easy to saturate.

[0031] The axial winding 51 of the present application adopts a single coil mode, installed in the left and right axial stators, located at both ends of the radial stator yoke 213 (fixed on the axial stator or fixed on the radial stator yoke 213), saving space, providing an axial magnetic circuit 001, and controlling the axial movement of the bearing rotor 1. The radial bearing adopts 16 levels, which are four symmetrically distributed The two poles at the ends are small teeth, and the two poles in the middle are large teeth. The magnetic poles of the shaped structure are distributed in SNSN (or NSNS) in space. The axial magnetic circuit 001 provided in the radial direction enhances or weakens the radial air gap magnetic field, controls the radial movement of the rotating shaft 10, and simultaneously realizes the radial and axial movement of the rotating shaft 10 in three degrees of freedom, effectively reducing the bearing volume and the rotor length, and improving the rotor operation stability.

[0032] The present application also discloses some embodiments, wherein the magnetic suspension active three-degree-of-freedom bearing further comprises an axial winding 51; the axial winding 51 is disposed in the first axial stator 31 and the second axial stator 41; the axial winding 51 is wound around the circumference of the rotating shaft 10. That is, the present application is a single coil mode.

[0033] The present application also discloses some embodiments, in which a radial coil 52 is wound around each pole, the radial coils 52 wound around two side poles 212 are connected in series, and the radial coils 52 wound around two middle poles 211 are connected in series.

[0034] like Figure 2 As shown, in the first quadrant, the current flow direction of the radial coil 52 corresponding to the upper left side pole 212 and the lower right middle pole 211 is left-in and right-out, while the current flow direction of the radial coil 52 corresponding to the upper left middle pole 211 and the lower right side pole 212 is right-in and left-out, thereby achieving that the magnetic poles of the four poles in the first quadrant are NSNS in the clockwise direction. Of course, the current flow direction can be exactly opposite so that the magnetic poles of the four poles in the first quadrant are SNSN in the clockwise direction. It should be noted that the polarity of the poles in other quadrants should meet the requirement of symmetry about the center of the rotating shaft 10. In this technical solution, by connecting the radial coils 52 of the two side poles 212 in series and the radial coils 52 of the two middle poles 211 in series, the magnetic forces presented by the two poles are completely consistent, which is convenient for adjusting and controlling the radial position.

[0035] The present application also discloses some embodiments, wherein the first axial stator assembly includes a first axial stator 31, the first axial stator 31 having a first inner magnetic ring 311 and a first outer magnetic ring 312, the axial winding 51 being located between the first inner magnetic ring 311 and the first outer magnetic ring 312, wherein a first axial inner working gap 004 is formed between the first inner magnetic ring 311 and the left end face of the bearing rotor 1, and the first outer magnetic ring 312 is located radially outside the radial coil 52.

[0036] The present application also discloses some embodiments, wherein the second axial stator assembly includes a second axial stator 41, the second axial stator 41 has a second inner magnetic ring 411 and a second outer magnetic ring 412, the axial winding 51 is located between the second inner magnetic ring 411 and the second outer magnetic ring 412, wherein a second axial inner working gap 005 is formed between the second inner magnetic ring 411 and the right end face of the bearing rotor 1, and the second outer magnetic ring 412 is located radially outside the radial coil 52.

[0037] The present application also discloses some embodiments, wherein the first axial stator 31 also includes a first connecting section, which connects the first inner magnetic ring 311 and the first outer magnetic ring 312; the second axial stator 41 also includes a second connecting section, which connects the second inner magnetic ring 411 and the second outer magnetic ring 412; the first inner magnetic ring 311 and the second inner magnetic ring 411 are respectively located on both axial sides of the bearing rotor 1, and the first outer magnetic ring 312 and the second outer magnetic ring 412 are in contact with each other, so that an accommodation space is enclosed between the first axial stator 31, the second axial stator 41 and the bearing rotor 1; the axial winding 51 is arranged in the accommodation space and is located on both axial sides of the radial stator 21.

[0038] The present application also discloses some embodiments, in which the control of the radial coil 52 wound on the middle pole 211 in each quadrant is independent of the control of the radial coil 52 wound on the side pole 212 .

[0039] The present application also discloses some embodiments in which the current flowing through the axial winding 51 in the first axial stator assembly is opposite to the current flowing through the axial winding 51 in the second axial stator assembly.

[0040] In some embodiments, the current flowing through the axial winding 51 in the first axial stator assembly is opposite to the current flowing through the axial winding 51 in the second axial stator assembly to ensure that the radial magnetic circuit 001 generated by the axial stator assemblies at both ends simultaneously enhances or weakens the radial magnetic circuit 002, thereby facilitating the control of the bearing rotor 1 to adjust the axial position of the bearing rotor 1.

[0041] The active three-degree-of-freedom magnetic bearing structure 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 1, the axial stator is located at both ends of the radial stator 21, and the radial bearing and the axial bearing are integrated. The structure is mainly composed of a left axial stator, a right axial stator, a left axial winding 51, a right axial winding 51, a radial winding, a radial stator 21, a bearing rotor 1, a rotating shaft 10 and other parts.

[0042] Figure 1The active three-degree-of-freedom axial bearing axial magnetic circuit 001 is shown in the figure. The axial stator structure is shown in the figure. The upper magnetic pole of the axial stator is connected to the radial stator yoke 213. The lower magnetic pole of the axial stator is located at both ends of the bearing rotor 1. The axial magnetic circuit 001 generated by the axial winding 51 is shown in the active three-degree-of-freedom magnetic bearing structure. Figure 1 As shown, compared with the traditional active magnetic bearing structure, the thrust plate is removed and replaced by a bearing rotor 1, the axial stator is located at both ends of the radial stator 21, and the radial bearing and the axial bearing are integrated. The structure is mainly composed of a left axial stator, a right axial stator, a left axial winding 51, a right axial winding 51, a radial winding, a radial stator 21, a bearing rotor 1, a rotating shaft 10 and other parts.

[0043] Figure 1 The figure shows an active three-degree-of-freedom axial bearing axial magnetic circuit 001. The axial stator structure is shown in the figure. The upper magnetic pole of the axial stator is connected to the radial stator yoke 213. The lower magnetic pole of the axial stator is located at both ends of the bearing rotor 1. The axial magnetic circuit 001 generated by the axial winding 51 includes a left axial magnetic circuit 001 and a right axial magnetic circuit 001, which are used to control the axial movement of the bearing rotor 1. The left axial magnetic circuit 001 passes through the left axial upper magnetic pole-radial stator yoke 213-radial stator 21 pole-radial working gap 003-bearing rotor 1-axial working gap-left axial stator lower magnetic pole back to the left axial stator clockwise. The direction is closed, the right axial magnetic circuit 001 passes through the right axial upper magnetic pole-radial stator yoke 213-radial stator 21 pole-radial working gap 003-bearing rotor 1-axial working gap-right axial stator lower magnetic pole and returns to the right axial stator and is closed in the counterclockwise direction. When the bearing rotor 1 needs to be controlled to move to the left, the current of the left bearing winding is increased, and the bearing rotor 1 is subjected to a large force to the left. Conversely, when the bearing rotor 1 needs to be controlled to move to the right, the current of the right bearing winding is increased, and the bearing rotor 1 is subjected to a large force to the right. Therefore, the axial movement of the bearing rotor 1 is controlled by controlling the current of the left and right axial windings 51.

[0044] Figure 2 The radial magnetic circuit 002 of the active three-degree-of-freedom radial bearing is shown. The structure of the radial stator 21 is shown in the figure. It has 16 magnetic poles, which are four symmetrically distributed. The two poles at the ends are small teeth, and the two poles in the middle are large teeth. The magnetic poles of the shaped structure are distributed in SNSN (or NSNS) in space, and the radial magnetic circuit 002 (002) is as follows Figure 2 As shown by the solid line, The first radial magnetic circuit 002 on the shaped structure is closed via radial small tooth a-radial working air gap-bearing rotor 1-radial working gap 003-radial large tooth b-radial magnetic yoke to radial small tooth a; the second radial magnetic circuit 002 is closed via radial large tooth c-radial working air gap-bearing rotor 1-radial working gap 003-radial large tooth b-radial magnetic yoke to radial large tooth c; the third radial magnetic circuit 002 is closed via radial large tooth c-radial working air gap-bearing rotor 1-radial working gap 003-radial small tooth d-radial magnetic yoke to radial large tooth c. The axial magnetic circuit 001 is as follows Figure 2 As shown by the dotted lines, all point to the center of the circle. The air gap magnetic field of the radial small tooth a and radial large tooth c of the shaped structure is enhanced, and the air gap magnetic field of the radial large tooth b and radial small tooth d is weakened. On the contrary, when the axial magnetic circuit 001 direction is all pointing to the circumference, The air gap magnetic field of the radial large tooth b and radial small tooth d of the shaped structure is enhanced, while the air gap magnetic field of the radial small tooth a and radial large tooth c is weakened. When the bearing rotor 1 needs to be controlled to move to the upper left, the upper left radial winding is energized to provide the bearing rotor 1 with a radial force to the upper left; when the bearing rotor 1 needs to be controlled to move upward, the upper left and right radial windings are energized to provide the bearing rotor 1 with an upward radial force. This control has a wide range of radial movement directions and flexible control. This three-degree-of-freedom magnetic bearing structure integrates the radial bearing and the axial bearing, has no thrust plate, has a compact structure, and is simple in process. It effectively reduces the bearing volume, shortens the rotor length, increases the rotor critical speed, and improves the system operation stability.

[0045] According to an embodiment of the present application, there is also provided a motor, comprising the above-mentioned magnetically suspended active three-degree-of-freedom bearing.

[0046] According to an embodiment of the present application, a compressor is also provided, comprising the above-mentioned motor.

[0047] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0048] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. 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 application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A magnetically suspended active three-degree-of-freedom bearing, characterized in that: include: A rotating shaft (10); A bearing rotor (1), wherein the bearing rotor (1) is sleeved on the rotating shaft (10); A radial stator (21), wherein the radial stator (21) is sleeved outside the bearing rotor (1); the radial stator (21) has 16 poles extending toward one side of the bearing rotor (1); on the cross section of the rotating shaft (10), the 16 poles are centrally symmetrical about the center of the rotating shaft (10) and are distributed in four quadrants, each of the quadrants having two middle poles (211) and two side poles (212) located on both sides of the middle poles (211); the two middle poles (211) are symmetrical about the angular bisector of the corresponding quadrants; the two side poles (212) are symmetrical about the angular bisector of the corresponding quadrants; the circumferential width of the middle poles (211) is greater than the circumferential width of the side poles (212); and a first axial stator (31) and a second axial stator (41), wherein the first axial stator (31) and the second axial stator (41) are sleeved outside the rotating shaft (10), and the first axial stator (31) and the second axial stator (41) are respectively arranged on both axial sides of the bearing rotor (1), and the first axial stator (31), the second axial stator (41) and the bearing rotor (1) enclose a receiving space, and the radial stator (21) is located in the receiving space; an axial magnetic circuit (001) is formed between the first axial stator component and the second axial stator component and the bearing rotor (1) and the radial stator (21) component respectively to adjust the axial position of the bearing rotor (1), and a radial magnetic circuit (002) is formed between the radial stator (21) component and the bearing rotor (1) to adjust the radial position of the bearing rotor (1); In each quadrant, in the counterclockwise direction, the first side pole (212) and the second middle pole (211) are spaced apart, and the second side pole (212) and the first middle pole (211) are spaced apart, wherein the flow direction of the radial magnetic circuit (002) in the first side pole (212) and the second middle pole (211) is opposite to the flow direction of the axial magnetic circuit (001), and the flow direction of the radial magnetic circuit (002) in the second side pole (212) and the first middle pole (211) is the same as the flow direction of the axial magnetic circuit (001).

2. The magnetically suspended active three-degree-of-freedom bearing according to claim 1, characterized in that: The magnetically suspended active three-degree-of-freedom bearing further comprises an axial winding (51); the axial winding (51) is arranged between the first axial stator (31) and the second axial stator (41); and the axial winding (51) is wound around the circumference of the rotating shaft (10).

3. The magnetically suspended active three-degree-of-freedom bearing according to any one of claims 1 to 2, characterized in that: A radial coil (52) is wound around each pole, the radial coils (52) wound around two side poles (212) are connected in series, and the radial coils (52) wound around two middle poles (211) are connected in series.

4. The magnetically suspended active three-degree-of-freedom bearing according to claim 3, characterized in that: The first axial stator assembly comprises a first axial stator (31), the first axial stator (31) having a first inner magnetic ring (311) and a first outer magnetic ring (312), the axial winding (51) being located between the first inner magnetic ring (311) and the first outer magnetic ring (312), wherein a first axial inner working gap (004) is formed between the first inner magnetic ring (311) and the left end face of the bearing rotor (1), a first axial outer working gap is formed between the first outer magnetic ring (312) and the left end face of the radial stator (21), and the first outer magnetic ring (312) is located radially outside the radial coil (52).

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

6. The magnetically suspended active three-degree-of-freedom bearing according to claim 5, characterized in that: The first axial stator (31) further comprises a first connecting section, the first connecting section connecting the first inner magnetic ring (311) and the first outer magnetic ring (312); the second axial stator (41) further comprises a second connecting section, the second connecting section connecting the second inner magnetic ring (411) and the second outer magnetic ring (412); the first inner magnetic ring (311) and the second inner magnetic ring (411) are respectively located on two axial sides of the bearing rotor (1), and the first outer magnetic ring (312) and the second outer magnetic ring (412) are in contact with each other, so that the first axial stator (31), the second axial stator (41) and the bearing rotor (1) enclose the accommodating space to form the accommodating space; the axial winding (51) is arranged in the accommodating space and is located on two axial sides of the radial stator (21).

7. The magnetically suspended active three-degree-of-freedom bearing according to claim 3, characterized in that: The control of the radial coil (52) wound on the middle pole (211) in each quadrant is independent of the control of the radial coil (52) wound on the side pole (212).

8. The magnetically suspended active three-degree-of-freedom bearing according to claim 2, characterized in that: The current flowing through the axial winding (51) in the first axial stator component is opposite to the current flowing through the axial winding (51) in the second axial stator component.

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

10. A compressor, characterized in that: The invention comprises the motor as claimed in claim 9.

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