CN115654011A - Magnetic suspension active three-degree-of-freedom bearing, motor and compressor - Google Patents

Abstract

The application provides a magnetic suspension active three-degree-of-freedom bearing, a motor and a compressor, wherein a rotating shaft, a bearing rotor, a radial stator, a first axial stator and a second axial stator are arranged on the rotating shaft, and the radial stator is provided with a plurality of polar columns extending towards one side of the bearing rotor; on the cross section of the rotating shaft, a plurality of polar columns are centrosymmetric about the center of the rotating shaft and are distributed in 4 quadrants; a first pole column and a second pole column are arranged in each quadrant; the circumferential width of the first pole is larger than that of the second pole; and an accommodating space is formed by enclosing the first axial stator, the second axial stator and the bearing rotor, and the radial stator is positioned in the accommodating space. The thrust disc does not need to be assembled independently in the rotating shaft, the structure is more compact, the process is simplified, the bearing size is effectively reduced, the length of the rotating shaft is shortened, the critical rotating speed of the rotor is improved, and the operation stability of a magnetic suspension system is improved.

Description

Magnetic suspension active three-degree-of-freedom bearing, motor and compressor

Technical Field

The application belongs to the technical field of magnetic suspension bearings, and particularly relates to a magnetic suspension active three-degree-of-freedom bearing, a motor and a compressor.

Background

At present, a magnetic suspension bearing (magnetic bearing for short) suspends a rotating shaft by using electromagnetic force applied to a rotor, and the rotating shaft and a stator are kept in a non-contact state, so that the magnetic suspension bearing has the advantages of no abrasion, high rotating speed, high precision, long service life and the like. Magnetic bearings can be classified into three categories according to their operating principles: active magnetic bearings, passive magnetic bearings, and hybrid magnetic bearings.

The magnetic bearings are further divided into radial magnetic suspension bearings and axial magnetic suspension bearings, wherein the radial magnetic suspension bearings realize the adjustment of the radial position of the rotating shaft through electromagnetic force between the radial magnetic suspension bearings and the radial rotor, and the axial magnetic suspension bearings realize the adjustment of the axial position of the rotating shaft through electromagnetic force between the axial magnetic suspension bearings and the thrust disc on the rotating shaft. In a magnetic suspension system, both ends of a rotating shaft are simultaneously provided with a radial magnetic suspension bearing and an axial magnetic suspension bearing, so that the three-degree-of-freedom direction position of the rotating shaft is adjusted.

However, in the related art, the thrust disc needs to be installed, so that the radial and axial stators are large in size, and the rotor is long, so that the processing and manufacturing process is complex, the product size is large, and the stability and the applicability of the magnetic suspension system are further influenced.

Therefore, how to provide a magnetic suspension active three-degree-of-freedom bearing, a motor and a compressor which can reduce the size of a radial and axial stator, shorten the length of a rotor, improve the critical rotating speed of the rotor and improve the stability and the applicability of a magnetic suspension system becomes a problem which needs to be solved by technicians in the field.

Disclosure of Invention

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

In order to solve the above problems, the present application provides a magnetic suspension active three-degree-of-freedom bearing, including:

a rotating shaft;

the bearing rotor is sleeved on the rotating shaft;

the radial stator is sleeved outside the bearing rotor; the radial stator is provided with a plurality of polar columns extending towards one side of the bearing rotor; on the cross section of the rotating shaft, a plurality of polar columns are centrosymmetric about the center of the rotating shaft and are distributed in 4 quadrants;

a first pole column and a second pole column are arranged in each quadrant; the circumferential width of the first pole is larger than that of the second pole;

the first axial stator and the second axial stator are sleeved outside the rotating shaft, the first axial stator and the second axial stator are respectively arranged on two axial sides of the bearing rotor, an accommodating space is formed by the first axial stator, the second axial stator and the bearing rotor in an enclosing manner, and the radial stator is positioned in the accommodating space; an axial magnetic circuit is formed between the first axial stator and the second axial stator and between the bearing rotor and the radial stator respectively so as to realize the adjustment of the axial position of the bearing rotor, and a radial magnetic circuit is formed between the radial stator and the bearing rotor so as to realize the adjustment of the radial position of the bearing rotor.

Furthermore, the magnetic suspension active three-degree-of-freedom bearing also comprises an axial winding; the axial winding is arranged between the first axial stator and the second axial stator; the axial winding is wound around the circumference of the rotating shaft.

Furthermore, each pole is wound with a radial winding, and the two second poles are wound with radial windings in series.

Further, the first axial stator is provided with a first inner magnetic ring and a first outer magnetic ring, the axial winding is arranged between the first inner magnetic ring and the first outer magnetic ring, a first axial inner side working gap is formed between the first inner magnetic ring and the left end face of the bearing rotor, and the first outer magnetic ring is arranged on the radial outer side of the radial winding.

And furthermore, the second axial stator is provided with a second inner magnetic ring and a second outer magnetic ring, the axial winding is positioned between the second inner magnetic ring and the second outer magnetic ring, a second axial inner side working gap is formed between the second inner magnetic ring and the right end face of the bearing rotor, and the second outer magnetic ring is positioned on the radial outer side of the radial winding.

Further, the first axial stator further comprises a first connecting section, and the first connecting section is connected with the first inner magnetic ring and the first outer magnetic ring; the second axial stator also comprises a second connecting section, and the second connecting section is connected with a second inner magnetic ring and a second outer magnetic ring; the first inner magnetic ring and the second inner magnetic ring are respectively positioned at two axial sides of the bearing rotor, and the first outer magnetic ring is in contact with the second outer magnetic ring, so that an accommodating space is formed by enclosing the first axial stator, the second axial stator and the bearing rotor; the axial winding is arranged in the accommodating space and is positioned on two axial sides of the radial stator.

Further, the radial winding wound on the first pole column in each quadrant is controlled independently of the radial winding wound on the second pole column.

Further, the energizing current in the axial windings in the first axial stator is opposite to the energizing current in the axial windings in the second axial stator.

Further, the number of the poles is 12; each quadrant is internally provided with a first pole column and two second pole columns; the two second pole posts are respectively positioned on two sides of the first pole post in the circumferential direction;

or the number of the poles is 8; each quadrant is provided with a first pole and a second pole; the second pole column and the first pole column are sequentially arranged in the circumferential direction.

Further, the direction of the magnetic force line of the radial magnetic circuit in the first pole is opposite to the direction of the magnetic force line of the axial magnetic circuit in the first pole;

and/or the direction of the magnetic force line of the radial magnetic circuit in the second pole is the same as the direction of the magnetic force line of the axial magnetic circuit in the first pole.

The application also provides a motor which comprises the magnetic suspension active three-degree-of-freedom bearing.

The application also provides a compressor, which comprises the motor.

According to the magnetic suspension active three-degree-of-freedom bearing, the motor and the compressor, a thrust disc does not need to be independently assembled on the rotating shaft, the overall structure and the processing and manufacturing process are simplified, the assembly is convenient, the integration degree is high, the structure is more compact, the volume of the bearing is effectively reduced, the length of the rotating shaft is shortened, the critical rotating speed of a rotor is improved, and the operation stability of a magnetic suspension system is improved; the size of the axial stator can be reduced, the length of the rotor can be shortened, the critical rotating speed of the rotor can be improved, and the stability and the applicability of a magnetic suspension system can be improved.

Drawings

Fig. 1 is a schematic diagram of an internal structure of a magnetic suspension active three-degree-of-freedom bearing according to an embodiment of the present application, in which a dashed arrow shows a flow direction of an axial magnetic circuit;

FIG. 2 is a relative position relationship between a radial stator and a bearing rotor of a 12-stage radial bearing, wherein a dotted arrow in the figure shows a flow direction of an axial magnetic circuit, and a solid arrow in the figure shows a flow direction of a radial magnetic circuit;

fig. 3 shows the relative position relationship between the radial stator and the bearing rotor of the 8-stage radial bearing, in which the dashed arrows show the flow direction of the axial magnetic circuit, and the solid arrows show the flow direction of the radial magnetic circuit.

The reference numbers are given as:

1. a bearing rotor; 10. a rotating shaft; 21. a radial stator; 211. a first pole column; 212. a second pole; 213. a stator yoke; 214. a stator pole; 31. a first axial stator; 311. a first inner magnetic ring; 312. a first outer magnetic ring; 41. a second axial stator; 411. a second inner magnetic ring; 412. a second outer magnetic ring; 51. an axial winding; 52. a radial winding; 001. an axial magnetic circuit; 002. a radial magnetic circuit; 003. a radial working gap; 004. a first axially inboard working gap; 005. the second axis is inwardly of the working gap.

Detailed Description

Referring to fig. 1 to 3, 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, wherein 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 a plurality of poles extending toward the bearing rotor 1 side; on the cross section of the rotating shaft 10, a plurality of poles are centrosymmetric about the center of the rotating shaft 10 and are distributed in 4 quadrants; each quadrant has a first pole post 211 and a second pole post 212; the circumferential width of the first pole post 211 is greater than the circumferential width of the second pole post 212;

the first axial stator 31 and the second axial stator 41 are sleeved outside the rotating shaft 10, the first axial stator 31 and the second axial stator 41 are respectively arranged at two axial sides of the bearing rotor 1, an accommodating space is formed by enclosing the first axial stator 31, the second axial stator 41 and the bearing rotor 1, and the radial stator 21 is positioned in the accommodating space; an axial magnetic circuit 001 is formed between the first axial stator 31 and the second axial stator 41 and the bearing rotor 1 and the radial stator 21, respectively, to adjust the axial position of the bearing rotor 1, and a radial magnetic circuit 002 is formed between the radial stator 21 and the bearing rotor 1 to adjust the radial position of the bearing rotor 1. The radial stator 21 further comprises stator poles 214.

The active three-degree-of-freedom magnetic bearing provided by the application removes a thrust disc, is replaced by a bearing rotor 1, and integrates a radial bearing and an axial bearing. Compared with the conventional active magnetic bearing, the active magnetic bearing does not need to be provided with a thrust disc, has compact structure and simple process; compared with the common mixed three-freedom-degree magnetic bearing, the three-freedom-degree magnetic bearing has no permanent magnet, provides a bias magnetic field and a control magnetic field by electromagnetic force, has large bearing capacity, high rigidity and flexible control, can run at high power, has high critical rotating speed and improves the stability and the applicability of a magnetic suspension system.

This application integrates journal bearing and axial bearing, no thrust dish, and compact structure greatly reduces radial axial stator size and shortens rotor length, improves the critical rotational speed of rotor, improves magnetic suspension system's stability and application.

Compared with the axial upper magnetic pole positioned beside the radial stator 21 pole, the radial stator 21 outer diameter and the axial stator thickness can be greatly reduced under the same radial and axial force condition, and the bearing stator volume is reduced.

The 12-grade radial bearing is adopted, the processing and manufacturing process is simple, and the radial magnetic circuit 002 is convenient to control. The permanent magnet-free high-power magnetic bearing has the advantages of no permanent magnet, low cost, convenience in assembly, large bearing capacity and capability of operating at high power. The radial and axial integration is high, the thrust disc is omitted, the cost is reduced, the structure is compact, the process is simple, the critical rotating speed is high, and the performance is stable.

The aforementioned 4 quadrants specifically refer to the center of the rotating shaft 10 as the coordinate origin O, and an orthogonal coordinate system XOY is established through the point O, and the orthogonal coordinate system XOY divides the aforementioned axial projection into the adjacent 4 quadrants, which is not described again as a basic geometric knowledge. Among this technical scheme, bearing rotor 1 is simultaneously as axial magnetic circuit 001 and radial magnetic circuit 002's conduction part, thrust disc and bearing rotor 1 integration among the prior art are as an organic whole, the degree of integrating of bearing further obtains improving, need not to assemble thrust disc alone in the pivot 10, and bearing rotor 1 is radial stator 21 and axial stator's magnetic circuit sharing, overall structure and processing manufacture technology obtain simplifying, the assembly of being convenient for, the degree of integrating is higher, the structure is compacter, the bearing volume has been reduced effectively, pivot 10 length has been shortened, improve the critical rotational speed of rotor, the operating stability of magnetic suspension system is improved.

The application also discloses some embodiments, the magnetic suspension active three-degree-of-freedom bearing further comprises an axial winding 51; the axial winding 51 is provided between 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. This application axial winding 51 adopts the monocoil mode, installs in controlling axial stator, is located radial stator yoke 213 both ends (be fixed in on the axial stator or be fixed in radial stator yoke 213), saves space, provides axial magnetic circuit 001, the axial displacement of control bearing rotor 1.

The application also discloses some embodiments, each pole is wound with a radial winding 52, and two second poles 212 are wound with radial windings 52 in series.

The present application further discloses embodiments in which the first axial stator 31 has a first inner magnetic ring 311 and a first outer magnetic ring 312, the axial winding 51 is located between the first inner magnetic ring 311 and the first outer magnetic ring 312, wherein a first axially 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 winding 52.

The present application also discloses embodiments of the 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 inner side working gap 005 is formed between the second inner magnetic ring 411 and a right end face of the bearing rotor 1, and the second outer magnetic ring 412 is located radially outside the radial winding 52.

The present application also discloses some embodiments, the first axial stator 31 further comprises a first connection section, the first connection section connects 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 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 at two axial sides of the bearing rotor 1, and the first outer magnetic ring 312 is in contact with the second outer magnetic ring 412, so that an accommodating space is defined between the first axial stator 31, the second axial stator 41 and the bearing rotor 1; the axial windings 51 are disposed in the accommodation space and located on both axial sides of the radial stator 21.

The present application also discloses embodiments in which the control of the radial winding 52 wound on the first pole post 211 in each quadrant is independent of the control of the radial winding 52 wound on the second pole post 212.

The application also discloses some embodiments, the electrified current in the axial winding 51 in the first axial stator is opposite to the electrified current in the axial winding 51 in the second axial stator, so as to ensure that the effect of the radial magnetic circuit 002 on the magnetic circuit of the axial magnetic circuit 001 generated by the axial stators at the two ends is enhanced or weakened at the same time, and further the control of the bearing rotor 1 is facilitated to adjust the axial position of the bearing rotor 1.

The application also discloses some embodiments, the plurality of poles are 12 poles; each quadrant has a first pole post 211 and two second pole posts 212; the two second pole posts 212 are respectively positioned at two circumferential sides of the first pole post 211; the axial winding adopts a single coil mode, is arranged in the left axial stator and the right axial stator and is positioned at two ends of a magnetic yoke of the radial stator (fixed on the axial stator or the magnetic yoke of the radial stator), thereby saving space, providing an axial magnetic circuit and controlling the axial movement of the bearing rotor. The radial bearing adopts 12-stage, four E-shaped structures are symmetrically distributed, magnetic poles at two ends of the radial bearing are small teeth, a middle magnetic pole is a large tooth, small tooth coils of single E-shaped structures are connected in series and are distributed in NSN (or SNS) mode in space, a bias magnetic circuit provided by an axial magnetic circuit in the radial direction strengthens or weakens a radial air gap magnetic field, movement of a rotating shaft in the radial direction is controlled, movement of the rotating shaft in three degrees of freedom in the radial direction and the axial direction is achieved, the size of the bearing and the length of a rotor are effectively reduced, and the operation stability of the rotor is improved.

Or the number of the poles is 8; each quadrant has a first pole post 211 and a second pole post 212; the second pole column 212 is arranged in order in the circumferential direction with the first pole column 211. The radial 8-level C-shaped structure is shown in FIG. 3, the radial magnetic circuits (002) are distributed in SSNNSSNN (or NNSSNNSS) in space as shown by the solid line, the bias magnetic circuits 001 provided in the axial direction are all pointed to the circumference as shown by the dotted line in FIG. 2, the radial air gap magnetic fields at the upper and lower ends are enhanced, the radial air gap magnetic fields at the left and right ends are weakened, and conversely, when the bias magnetic circuits provided in the axial direction are all pointed to the circle center, the radial air gap magnetic fields at the left and right ends are enhanced, and the radial air gap magnetic fields at the upper and lower ends are weakened. When the number of the poles is 8, the size of each tooth is consistent.

This application integrates radial bearing and axial bearing, no thrust dish, and compact structure greatly reduces footpath axial stator size and shortens rotor length, improves the critical rotational speed of rotor, improves magnetic suspension system's stability and application. Compared with the situation that the magnetic pole is positioned beside the radial stator pole column in the axial direction, the radial stator outer diameter and the axial stator thickness can be greatly shortened under the same radial and axial force output condition, and the bearing stator volume is reduced. And a 12-grade or 8-grade radial bearing is adopted, the processing and manufacturing process is simple, and the radial magnetic circuit is convenient to control. The permanent magnet is not used, the cost is low, the assembly is convenient, the bearing capacity is large, and the high-power operation can be realized. The radial and axial integration is high, no thrust disc exists, the cost is reduced, the structure is compact, the process is simple, the critical rotating speed is high, and the performance is stable.

The application also discloses some embodiments, the direction of the magnetic force line of the radial magnetic circuit 002 in the first pole post 211 is opposite to the direction of the magnetic force line of the axial magnetic circuit 001 in the first pole post 211;

and/or the direction of the magnetic force lines of the radial magnetic circuit 002 in the second pole post 212 is the same as the direction of the magnetic force lines of the axial magnetic circuit 001 in the first pole post 211.

The active three-freedom-degree magnetic bearing structure is shown in figure 1, compared with a traditional active magnetic bearing structure, a thrust disc is removed, a bearing rotor is used for replacing the thrust disc, axial stators are located at two ends of a radial stator, and the radial bearing and the axial bearing are integrated.

Fig. 1 shows an axial magnetic circuit of an active three-degree-of-freedom axial bearing, where an axial stator structure is shown in the figure, an upper magnetic pole of the axial stator is engaged with a magnetic yoke 213 of a radial stator, a lower magnetic pole of the axial stator is located at two ends of a bearing rotor 1, an axial magnetic circuit 001 generated by an axial winding includes a left axial magnetic circuit and a right axial magnetic circuit, the left axial magnetic circuit returns to the left axial stator through a left upper magnetic pole-a radial stator magnetic yoke-a radial stator pole-a radial working gap 003-the bearing rotor 1-an axial working gap-a left axial stator lower magnetic pole to close, the right axial magnetic circuit returns to the right axial stator through a right upper magnetic pole-a radial stator magnetic yoke-a radial stator pole-a radial working gap 003-the bearing rotor 1-an axial working gap-a right axial stator lower magnetic pole to close, when the bearing rotor needs to be controlled to move leftwards, a left bearing winding current is increased, and a left bearing winding current is increased, otherwise, a right bearing rotor force is increased, and a right bearing rotor is controlled, so that the left and the axial winding current is controlled to move rightwards.

Fig. 2 shows an active radial magnetic circuit of a three-degree-of-freedom radial bearing, where the radial stator structure is shown in the figure, and has 12 magnetic poles, four E-shaped structures are symmetrically distributed, two ends of the radial magnetic circuit are small teeth, a middle is large teeth, radial windings on the small teeth at the two ends are connected in series, each E-shaped magnetic circuit is spatially NSN (or SNS) distributed, the radial magnetic circuit 002 is shown in a solid line in fig. 2, an axial magnetic circuit 001 is shown in a dotted line in fig. 2, and the small teeth at the two ends of the E-shaped structure have enhanced air gap magnetic fields, and the large teeth at the middle have reduced air gap magnetic fields, whereas when the bias magnetic circuit direction provided in the axial direction is completely directed to the circle, the small teeth at the two ends of the E-shaped structure have reduced air gap magnetic fields, and the large teeth at the middle have enhanced air gap magnetic fields. When the bearing rotor needs to be controlled to move towards the left upper side, the radial winding at the left upper side is electrified to provide a radial force of the bearing rotor towards the left upper side; when the bearing rotor needs to be controlled to move upwards, the left upper radial winding and the right upper radial winding are electrified to provide upward radial force for the bearing rotor, and the control of the radial direction is wide in moving direction and flexible in control. The three-degree-of-freedom magnetic bearing structure integrates the radial bearing and the axial bearing, has no thrust disc, is compact in structure and simple in process, effectively reduces the volume of the bearing, shortens the length of a rotor, improves the critical rotating speed of the rotor, and improves the running stability of a system.

Specifically, referring to fig. 2, the aforementioned 4 quadrants are respectively an upper-right first quadrant, an upper-left second quadrant, a lower-left third quadrant, and a lower-right fourth quadrant, taking 3 poles in the first quadrant as an example, as shown in the figure, the energization direction of each radial winding 52 is based on, wherein one of the free ends of the first pole 211 presents an S pole (upper-left) and the other presents an N pole (lower-right), the free end of one second pole 212 presents an N pole, the other second pole 212 presents an S pole, the flow direction of the radial magnetic circuit 002 in the upper-left second pole 212 and the lower-right first pole 211 is the same as the flow direction of the axial magnetic circuit 001, so that the magnetic fluxes between the two poles and the bearing rotor 1 can be increased, the radial forces at the two positions are increased, the flow directions of the radial magnetic circuit 002 and the axial magnetic circuit 001 in the first pole column 211 at the upper left and the second pole column 212 at the lower right are opposite, so that the magnetic flux between the two pole columns and the bearing rotor 1 is weakened, and the radial force at the position is reduced, the above contents are directed at the condition that the axial magnetic flux in one quadrant influences the pole columns, the reinforcement and the weakening of the axial magnetic flux in four quadrants on the radial magnetic flux are mutually counteracted, 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 does not influence the whole radial magnetic circuit 002, and the control of the magnetic bearing is simplified.

As shown in fig. 2, the first pole post 211 simultaneously serves as a flow member for magnetic flux in the second pole post 212, and the circumferential width of the first pole post 211 is designed to be larger than the circumferential width of the adjacent pole post, so that magnetic paths on both sides can be optimized. Establish ties first utmost point post 211 and second utmost point post 212 mutually simultaneously, guarantee that radial control turn is unanimous with radial electric current to only need adjust a current control radial movement, this kind of control scheme is simple, guarantees that the radial magnetic flux of first utmost point post 211 compares many at both ends, and radial magnetism on four utmost point posts is close unanimously and the difficult saturation of magnetic circuit, still can consider the influence of middle axial magnetic circuit 001 simultaneously, and the unanimous magnetic circuit of axial magnetism on four utmost point posts is difficult for the saturation.

The active three-degree-of-freedom magnetic bearing structure is shown in fig. 1, compared with the traditional active magnetic bearing structure, a thrust disc is removed, the structure is replaced by a bearing rotor 1, axial stators are positioned at two ends of a radial stator 21, and the radial bearing and the axial bearing are integrated.

Fig. 1 shows an axial magnetic circuit 001 of an active three-degree-of-freedom axial bearing, the structure of an axial stator is shown in the figure, the upper magnetic pole of the axial stator is connected with a magnetic yoke 213 of a radial stator, the lower magnetic pole of the axial stator is positioned at two ends of a bearing rotor 1, the axial magnetic circuit 001 generated by an axial winding 51 is shown in the figure 1, compared with the traditional active magnetic bearing structure, a thrust disc is removed, the axial stator is replaced by a bearing rotor 1, the axial stator is positioned at two ends of a radial stator 21, and the radial bearing and the axial bearing are integrated, and the structure mainly comprises a left axial stator, a right axial stator, a left axial winding 51, a right axial winding 51, a radial winding, the radial stator 21, the bearing rotor 1, a rotating shaft 10 and other parts.

According to an embodiment of the present application, there is also provided a motor including the above magnetic suspension active three-degree-of-freedom bearing.

According to an embodiment of the present application, there is also provided a compressor including the motor described above.

Those skilled in the art will readily appreciate that the advantageous features of the above described modes can be freely combined, superimposed and combined without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims (12)

1. A magnetic suspension active three-degree-of-freedom bearing is characterized by comprising:

a rotating shaft (10);

the bearing rotor (1), the said bearing rotor (1) is set up on the said spindle (10);

the radial stator (21), the said radial stator (21) is located outside the said bearing rotor (1) in a sleeving manner; the radial stator (21) has a plurality of poles extending toward one side of the bearing rotor (1); on the cross section of the rotating shaft (10), the pole columns are centrosymmetric about the center of the rotating shaft (10) and are distributed in 4 quadrants; each quadrant is provided with a first pole column (211) and a second pole column (212); the circumferential width of the first pole column (211) is greater than the circumferential width of the second pole column (212);

the first axial stator (31) and the second axial stator (41) are sleeved outside the rotating shaft (10), the first axial stator (31) and the second axial stator (41) are respectively arranged on two axial sides of the bearing rotor (1), an accommodating space is formed by enclosing the first axial stator (31), the second axial stator (41) and the bearing rotor (1), and the radial stator (21) is positioned in the accommodating space; an axial magnetic circuit (001) is formed between the first axial stator (31) and the second axial stator (41) and the bearing rotor (1) and between the radial stator (21) and the bearing rotor (1) respectively to realize the adjustment of the axial position of the bearing rotor (1), and a radial magnetic circuit (002) is formed between the radial stator (21) and the bearing rotor (1) to realize the adjustment of the radial position of the bearing rotor (1).

2. The magnetic levitation active three-degree-of-freedom bearing according to claim 1, further comprising an axial winding (51); the axial winding (51) is arranged between 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).

3. The magnetic suspension active three-degree-of-freedom bearing according to any one of claims 1-2, wherein a radial winding (52) is wound on each of the poles, and the two second poles (212) are connected in series around the radial winding (52).

4. The magnetic suspension active three-degree-of-freedom bearing according to claim 3, characterized in that the first axial stator (31) has a first inner magnetic ring (311) and a first outer magnetic ring (312), the axial winding (51) is between the first inner magnetic ring (311) and the first outer magnetic ring (312), wherein a first axially 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 radially outside the radial winding (52).

5. The magnetic levitation active three-degree-of-freedom bearing according to claim 4, wherein the 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 between the second inner magnetic ring (411) and the second outer magnetic ring (412), wherein a second inner magnetic ring (411) and a right end face of the bearing rotor (1) form a second inner working gap (005) therebetween, and the second outer magnetic ring (412) is radially outside the radial winding (52).

6. The magnetic levitation active three-degree-of-freedom bearing according to claim 5, wherein the first axial stator (31) further comprises a 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 connecting a 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) is in contact with the second outer magnetic ring (412), so that the first axial stator (31), the second axial stator (41) and the bearing rotor (1) are enclosed to form the accommodating space; the axial windings (51) are arranged in the accommodating space and are positioned on two axial sides of the radial stator (21).

7. The active magnetic suspension three degree of freedom bearing according to claim 5, characterized in that the control of the radial winding (52) wound on the first pole column (211) in each quadrant is independent of the control of the radial winding (52) wound on the second pole column (212).

8. A magnetic levitation active three degree of freedom bearing according to claim 2, wherein the energizing current in the axial windings (51) in the first axial stator is opposite to the energizing current in the axial windings (51) in the second axial stator.

9. The magnetic suspension active three-degree-of-freedom bearing according to claim 2, wherein the number of the plurality of poles is 12; each quadrant has one first pole column (211) and two second pole columns (212); the two second pole posts (212) are respectively positioned at two circumferential sides of the first pole post (211);

or the number of the poles is 8; one said first pole post (211) and one said second pole post (212) in each quadrant; the second pole column (212) and the first pole column (211) are sequentially arranged in the circumferential direction.

10. The magnetic suspension active three-degree-of-freedom bearing according to claim 1, wherein the direction of the magnetic lines of the radial magnetic circuit (002) in the first pole column (211) is opposite to the direction of the magnetic lines of the axial magnetic circuit (001) in the first pole column (211);

and/or the direction of the magnetic force line of the radial magnetic circuit (002) in the second pole column (212) is the same as the direction of the magnetic force line of the axial magnetic circuit (001) in the first pole column (211).

11. An electric machine comprising a magnetic levitation active three-degree-of-freedom bearing as recited in any one of claims 1 to 10.

12. A compressor comprising the motor of claim 11.

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