CN115654012B - Magnetic active three-degree-of-freedom bearings, motors and compressors - Google Patents
Magnetic active three-degree-of-freedom bearings, motors and compressors Download PDFInfo
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- CN115654012B CN115654012B CN202211259956.4A CN202211259956A CN115654012B CN 115654012 B CN115654012 B CN 115654012B CN 202211259956 A CN202211259956 A CN 202211259956A CN 115654012 B CN115654012 B CN 115654012B
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Abstract
The application provides a magnetic suspension active three-degree-of-freedom bearing, a motor and a compressor, which comprise a rotating shaft, a bearing rotor, a radial stator, a first axial stator and a second axial stator, wherein the radial stator is provided with 16 polar posts extending towards one side of the bearing rotor, the 16 polar posts are in central symmetry about the center of the rotating shaft and distributed in 4 quadrants, each quadrant is internally provided with two middle polar posts and two side polar posts positioned on two sides of the middle polar post, the circumferential width of the middle polar post is larger than that of the side polar posts, 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 encircling among the first axial stator, the second axial stator and the bearing rotor, and the radial stator is positioned in the accommodating space. The application has the advantages that the thrust disc is not required to be assembled on the rotating shaft independently, the structure is more compact, the process is simplified, the volume of the bearing is effectively reduced, the length of the rotating shaft is shortened, the critical rotating speed of the rotor is improved, and the running stability of the magnetic suspension system is improved.
Description
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 (called a magnetic bearing for short) utilizes electromagnetic force to a rotor to suspend a rotating shaft, and the rotating shaft and a stator keep 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. The magnetic bearings can be classified into three types according to the working principle, namely active magnetic bearings, passive magnetic bearings and hybrid magnetic bearings.
The magnetic bearing is divided into a radial magnetic suspension bearing and an axial magnetic suspension bearing, wherein the radial magnetic suspension bearing realizes the adjustment of the radial position of the rotating shaft through electromagnetic force between the radial magnetic suspension bearing and the radial rotor, and the axial magnetic suspension bearing realizes the adjustment of the axial position of the rotating shaft through electromagnetic force between the axial magnetic suspension bearing and a thrust disc on the rotating shaft. In a magnetic suspension system, radial magnetic suspension bearings and axial magnetic suspension bearings are simultaneously arranged at two ends of a rotating shaft, so that the three-degree-of-freedom directional position of the rotating shaft is adjusted.
However, in the related art, a thrust disc needs to be installed, so that the radial direction is large in size of the stator and the rotor is long, 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 affected.
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-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 is an urgent problem to be solved by those skilled in the art.
Disclosure of Invention
Therefore, the technical problem to be solved by the application is to provide the magnetic suspension active three-degree-of-freedom bearing, the motor and the compressor, which can reduce the size of a radial-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.
In order to solve the problems, the application provides a magnetic suspension active three-degree-of-freedom bearing, which comprises a rotating shaft, a bearing rotor, a radial stator, a first axial stator and a second axial stator, wherein the bearing rotor is sleeved on the rotating shaft; the radial stator is sleeved outside the bearing rotor, the radial stator is provided with 16 polar posts extending towards one side of the bearing rotor, the 16 polar posts are in central symmetry about the center of the rotating shaft and distributed in 4 quadrants, two middle polar posts and two side polar posts positioned on two sides of the middle polar posts are arranged in each quadrant, the two middle polar posts are symmetrical about angular bisectors of the corresponding quadrants, the two side polar posts are symmetrical about the angular bisectors of the corresponding quadrants, the circumferential width of the middle polar post is larger than the circumferential width of the side polar post, 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 encircling the first axial stator, the second axial stator and the bearing rotor, the radial stator is positioned in the accommodating space, and an axial magnetic circuit is respectively formed between the first axial stator component and the second axial stator component and the bearing rotor and the radial stator component so as to realize the adjustment of the axial position of the bearing rotor, and the radial magnetic circuit is formed between the radial stator component and the bearing rotor so as to realize the adjustment of the radial position of the bearing rotor.
The magnetic suspension active three-degree-of-freedom bearing further comprises an axial winding, wherein the axial winding is arranged in the first axial stator and the second axial stator, and the axial winding is wound around the circumference of the rotating shaft.
Further, radial coils are wound on each pole, the radial coils wound on the two side poles are connected in series, and the radial coils wound on the two middle poles are connected in series.
Further, the first axial stator assembly comprises a first axial stator, 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 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 arranged on the radial outer side of the radial coil.
Further, the second axial stator assembly comprises a second axial stator, the second axial stator is provided with a second inner magnetic ring and a second outer magnetic ring, the axial winding is arranged 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, a second axial outer side 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 arranged on the radial outer side of the radial coil.
The first axial stator further comprises a first connecting section, the first connecting section is connected with the first inner magnetic ring and the first outer magnetic ring, the second axial stator further comprises a second connecting section, the second connecting section is connected with 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 two axial sides of the bearing rotor, the first outer magnetic ring and the second outer magnetic ring are in contact, so that an accommodating space is formed by surrounding the first axial stator, the second axial stator and the bearing rotor, and the axial winding is arranged in the accommodating space and located on two axial sides of the radial stator.
Further, the control of the radial coils wound on the intermediate pole in each quadrant is independent of the control of the radial coils wound on the side poles.
Further, the energizing current in the axial windings in the first axial stator assembly is opposite to the energizing current in the axial windings in the second axial stator assembly.
The application also provides a motor, which comprises the magnetic suspension active three-degree-of-freedom bearing.
The application also provides a compressor comprising the motor.
The magnetic suspension active three-degree-of-freedom bearing, the motor and the compressor provided by the application have the advantages that a thrust disc is not required to be assembled on a rotating shaft independently, the whole structure and the processing and manufacturing process are simplified, the assembly is convenient, the integration degree is higher, the structure is more compact, the bearing volume is effectively reduced, the length of the rotating shaft is shortened, the critical rotating speed of a rotor is improved, and the running stability of a magnetic suspension system is 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, wherein a dashed arrow in the figure shows a flow direction of an axial magnetic circuit;
Fig. 2 is a relative positional relationship of the radial stator and the bearing rotor in fig. 1, in which a dotted arrow shows a flow direction of the axial magnetic circuit, and a solid arrow shows a flow direction of the radial magnetic circuit.
The reference numerals are expressed as:
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
Referring to fig. 1 to 2 in combination, a magnetic suspension active three-degree-of-freedom bearing comprises 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 is provided with 16 polar posts extending towards one side of the bearing rotor 1, the 16 polar posts are centrally symmetrical about the center of the rotating shaft 10 and distributed in 4 quadrants in the cross section of the rotating shaft 10, each quadrant is provided with two middle polar posts 211 and two side polar posts 212 positioned on two sides of the middle polar post 211, the two middle polar posts 211 are symmetrical about angular bisectors of the corresponding quadrants, the two side polar posts 212 are symmetrical about the angular bisectors of the corresponding quadrants, the circumferential width of the middle polar post 211 is larger than the circumferential width of the side polar 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 on two axial sides of the bearing rotor 1, an accommodating space is formed by surrounding the first axial stator 31, the second axial stator 41 and the bearing rotor 1, the radial stator 21 are respectively positioned in the accommodating 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, so that the axial magnetic circuit 1 is axially adjusted to realize the radial position adjustment of the rotor 1, and the radial stator component 002 is formed to realize the radial position adjustment of the radial stator 1. The radial stator 21 further includes a stator pole 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 hybrid three-degree-of-freedom magnetic bearing, the magnetic bearing has the advantages of no need of installing a thrust disc, compact structure, simple process, no permanent magnet, large bearing capacity, high rigidity and flexible control, and can operate in high power and high critical rotation speed, and the stability and the applicability of a magnetic suspension system are improved.
The application integrates the radial bearing and the axial bearing, has no thrust disc, compact structure, greatly reduces the radial-axial stator size, shortens the rotor length, improves the critical rotation speed of the rotor, and improves the stability and the applicability of the magnetic suspension system.
Compared with the process that the magnetic poles in the axial direction are positioned beside the poles of the radial stator 21, the radial stator 21 outer diameter and the axial stator thickness can be greatly shortened under the condition of equal radial and axial force, and the volume of the bearing stator is reduced.
The application adopts 16-level radial bearings, has simple processing and manufacturing process and convenient control of the radial magnetic circuit 002. The application has no permanent magnet, low cost, convenient assembly, large bearing capacity and high-power operation. The application has high radial and axial integration, no thrust disc, reduced cost, compact structure, simple process, high critical rotation speed and stable performance.
The 4 poles in each quadrant have two middle poles 211 and two side poles 212 at two sides of the middle pole 211, the two middle poles 211 and the two side poles 212 are symmetrical about the angular bisectors of the corresponding quadrants, and in the same quadrant, the adjacent side poles 212 and the middle pole 211 form opposite polarities, and one side pole 212, the two middle poles 211 and the other side pole 212 form oneA shape structure.
The aforementioned 4 quadrants specifically refer to the center of the rotating shaft 1010 as the origin O of coordinates, and an orthogonal coordinate system XOY is established through the point O, and the orthogonal coordinate system XOY divides the aforementioned axial projection into adjacent 4 quadrants, which is not described in detail as basic geometric knowledge. In this technical scheme, bearing rotor 1 is as the conduction part of axial magnetic circuit 001 and radial magnetic circuit 002 simultaneously, with thrust disk and the bearing rotor 1 integration as an organic whole among the prior art, the integrated level of bearing further obtains improving, need not alone to assemble thrust disk on the pivot 1010, and bearing rotor 1 is radial stator 21 subassembly and axial stator subassembly's magnetic circuit sharing, overall structure and processing manufacturing technology are simplified, be convenient for assemble, the integrated level is higher, the structure is compacter, bearing volume has been reduced effectively, the length of pivot 10 has been shortened, the critical rotational speed of rotor is improved, the operating stability of magnetic suspension system is improved.
With specific reference 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 pole columns in the first quadrant as examples, as shown in the drawing, the energizing directions of the radial coils 52 are based, wherein the free end of the middle pole column 211 presents an S pole (upper left) and another presents an N pole (lower right), the free end of one side pole column 212 presents an N pole, the other side pole column 212 presents an S pole, the radial magnetic circuit 002 flow direction and the axial magnetic circuit 001 flow direction in the upper left side pole column 212 and the lower right middle pole column 211 are the same, so that the magnetic flux between the two pole columns and the bearing rotor 1 can be increased, the radial force at the two positions is further increased, and in the middle pole 211 at the upper left and the side pole 212 at the lower right, the radial magnetic circuit 002 and the axial magnetic circuit 001 flow in opposite directions, so that the magnetic flux between the two poles and the bearing rotor 1 is weakened, and the radial force at the two positions is further reduced.
As shown in fig. 2, the middle pole 211 is used as a flow member of magnetic lines in the side pole 212, and the circumferential width of the middle pole 211 is designed to be larger than the circumferential width of two adjacent poles, so that the magnetic circuits on both sides can be optimized. The middle pole 211 and the side pole 212 are connected in series at the same time, so that the number of turns of radial control and radial current are consistent, and therefore, only one current is required to be regulated to control radial movement.
The axial winding 51 of the present application adopts a single coil mode, is installed in the left and right axial stators, is positioned at both ends of the radial stator yoke 213 (fixed on the axial stator or fixed on the radial stator yoke 213), saves space, provides an axial magnetic circuit 001, and controls the axial movement of the bearing rotor 1. The radial bearing adopts 16 stages and is symmetrically distributed with four stagesThe magnetic poles at the two ends of the shape structure are small teeth, the two magnetic poles in the middle are big teeth, eachThe magnetic poles of the shape structure are distributed in SNSN (or NSNS) in space, an axial magnetic circuit 001 provided in the radial direction enhances or weakens a radial air gap magnetic field, the radial movement of the rotating shaft 10 is controlled, the radial and axial movements of the rotating shaft 10 are realized, the bearing volume and the rotor length are effectively reduced, and the running stability of the rotor 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 arranged in 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. I.e. the application is in single coil mode.
The present application also discloses some embodiments, wherein each pole is wound with a radial coil 52, the radial coils 52 wound by the two side pole 212 are connected in series, and the radial coils 52 wound by the two middle pole 211 are connected in series.
As shown in fig. 2, in the first quadrant, the current flows of the radial coils 52 corresponding to the upper left side pole 212 and the lower right middle pole 211 are left in and right out, and the current flows of the radial coils 52 corresponding to the upper left middle pole 211 and the lower right side pole 212 are right in and left out, so that the clockwise magnetic poles of the four poles in the first quadrant are NSNS, and of course, the current flows can be exactly opposite so that the clockwise magnetic poles of the four poles in the first quadrant are SNSNs, and it should be noted that the pole polarities in the other quadrants should satisfy the requirement of central symmetry about the rotating shaft 10. In this technical solution, by connecting the radial coils 52 of the two side poles 212 in series, and connecting the radial coils 52 of the two middle poles 211 in series, the magnetic forces presented by the two poles are completely consistent, so as to facilitate the adjustment and control of the radial positions.
The present application also discloses some embodiments, the first axial stator assembly includes a first axial stator 31, the first axial stator 31 has a first inner magnetic ring 311 and a first 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 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.
The present application also discloses some embodiments, the second axial stator assembly comprises a second axial stator 41, the second axial stator 41 is provided with a second inner magnetic ring 411 and a second outer magnetic ring 412, the axial winding 51 is positioned between the second inner magnetic ring 411 and the second outer magnetic ring 412, a second axial inner working gap 005 is formed between the second inner magnetic ring 411 and the right end surface of the bearing rotor 1, and the second outer magnetic ring 412 is positioned at the radial outer side of the radial coil 52.
The application also discloses some embodiments, the first axial stator 31 further comprises a first connecting section, the first connecting section is connected with 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 is connected with 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 positioned on two axial sides of the bearing rotor 1, the first outer magnetic ring 312 and the second outer magnetic ring 412 are in contact, so that an accommodating space is formed by surrounding the first axial stator 31, the second axial stator 41 and the bearing rotor 1, and the axial winding 51 is arranged in the accommodating space and positioned on two axial sides of the radial stator 21.
The present application also discloses some embodiments wherein the control of the radial coil 52 wound on the intermediate pole 211 in each quadrant is independent of the control of the radial coil 52 wound on the side pole 212.
Some embodiments are also disclosed in which the energizing current in the axial windings 51 in the first axial stator assembly is opposite to the energizing current in the axial windings 51 in the second axial stator assembly.
In some embodiments, the energizing current in the axial windings 51 in the first axial stator assembly is opposite to the energizing current in the axial windings 51 in the second axial stator assembly to ensure that the effect of the magnetic circuits 001 of the axial magnetic circuits 001 generated by the axial stator assemblies at both ends on the radial magnetic circuits 002 is simultaneously enhanced or simultaneously weakened, thereby facilitating control of the bearing rotor 1 to adjust the axial position of the bearing rotor 1.
As shown in figure 1, compared with the traditional active magnetic bearing structure, the active three-degree-of-freedom magnetic bearing structure has the advantages that a thrust disc is removed, the active three-degree-of-freedom magnetic bearing structure is replaced by a bearing rotor 1, an axial stator is positioned at two ends of a radial stator 21, the radial bearing and the axial bearing are integrated, and the active three-degree-of-freedom magnetic bearing 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, a bearing rotor 1, a rotating shaft 10 and other parts.
Fig. 1 shows an active three-degree-of-freedom axial bearing axial magnetic circuit 001, an axial stator structure is shown in the figure, upper magnetic poles of the axial stator are connected with a radial stator yoke 213, lower magnetic poles of the axial stator are positioned at two ends of a bearing rotor 1, the axial magnetic circuit 001 generated by an axial winding 51 is shown in fig. 1, compared with a traditional active magnetic bearing structure, a thrust disk is removed, the active three-degree-of-freedom axial bearing structure is replaced by a bearing rotor 1, the axial stator is positioned at two ends of a radial stator 21, 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.
Fig. 1 shows an active three-degree-of-freedom axial bearing axial magnetic circuit 001, the axial stator structure is shown as the figure, the upper magnetic pole of the axial stator is connected with a radial stator yoke 213, 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 comprises a left axial magnetic circuit 001 and a right axial magnetic circuit 001 and is used for controlling the axial movement of the bearing rotor 1, the left axial magnetic circuit 001 is closed in the clockwise direction of the left axial stator through the left upper magnetic pole-radial stator yoke 213-radial stator 21 pole column-radial stator lower magnetic pole back to the left axial stator through the left axial upper magnetic pole-radial stator yoke 213-radial stator 21 pole column-radial working gap 003-bearing rotor 1-axial working gap-lower magnetic pole back to the right axial stator anticlockwise direction, when the bearing rotor 1 needs to be controlled to move leftwards, the left bearing winding current is increased, and conversely, when the bearing rotor 1 needs to be controlled to move rightwards, the right bearing winding current is increased, the bearing rotor 1 receives rightwards force to be increased, and the axial movement of the bearing rotor 1 is controlled by controlling the magnitude of the left axial winding current and the bearing rotor 1.
FIG. 2 shows an active three-degree-of-freedom radial bearing radial magnetic circuit 002, and a radial stator 21 with 16 poles is shown in the figure, and is four symmetrically distributedThe magnetic poles at the two ends of the shape structure are small teeth, the two magnetic poles in the middle are big teeth, eachThe magnetic poles of the shape structure are spatially distributed in SNSN (or NSNS), the radial magnetic circuit 002 (002) is shown as a solid line in figure 2,The first radial magnetic circuit 002 on the shape structure is closed to the radial small tooth a through the radial small tooth a-radial working air gap-bearing rotor 1-radial working air gap 003-radial big tooth b-radial magnetic yoke, the second radial magnetic circuit 002 is closed to the radial large tooth c through the radial big tooth c-radial working air gap-bearing rotor 1-radial working air gap 003-radial big tooth b-radial magnetic yoke, and the third radial magnetic circuit 002 is closed to the radial big tooth c through the radial big tooth c-radial working air gap-bearing rotor 1-radial working air gap 003-radial small tooth d-radial magnetic yoke. The axial magnetic circuit 001 is shown by the dotted line in FIG. 2 and is all directed to the center of a circleThe radial small tooth a and the radial large tooth c with the shape structure strengthen the air gap field, the radial large tooth b and the radial small tooth d weaken the air gap field, otherwise, when the axial magnetic circuit 001 direction points to the circumference completely, the air gap field is formed betweenThe air gap magnetic fields of the radial big teeth b and the radial small teeth d of the shape structure are enhanced, and the air gap magnetic fields of the radial small teeth a and the radial big teeth c are weakened. When the bearing rotor 1 is required to be controlled to move upwards, the upper left radial winding is electrified to provide radial force for the upper left of the bearing rotor 1, and when the bearing rotor 1 is required to be controlled to move upwards, the upper left radial winding and the upper right radial winding are electrified to provide radial force for the bearing rotor 1, so that the control of the radial direction movement direction is wide and the control is flexible. The three-degree-of-freedom magnetic bearing structure integrates the radial bearing and the axial bearing, has no thrust disc, compact structure and simple process, effectively reduces the volume of the bearing, shortens the length of the rotor, improves the critical rotating speed of the rotor and improves the running stability of the system.
According to the embodiment of the application, the motor comprises the magnetic suspension active three-degree-of-freedom bearing.
According to an embodiment of the present application, there is also provided a compressor including the above motor.
Those skilled in the art will readily appreciate that the advantageous features of the various aspects described above may be freely combined and stacked without conflict.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application. The foregoing is merely a preferred embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present application, and these modifications and variations should also be regarded as the scope of the application.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211259956.4A CN115654012B (en) | 2022-10-14 | 2022-10-14 | Magnetic active three-degree-of-freedom bearings, motors and compressors |
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| CN202211259956.4A CN115654012B (en) | 2022-10-14 | 2022-10-14 | Magnetic active three-degree-of-freedom bearings, motors and compressors |
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| CN115654012B true CN115654012B (en) | 2024-12-13 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666353A (en) * | 2009-09-23 | 2010-03-10 | 江苏大学 | Active magnetic bearing using bias magnetic flux commonly in radial direction and in axial direction and control method thereof |
| CN115111265A (en) * | 2022-07-21 | 2022-09-27 | 重庆开山流体机械有限公司 | An Asymmetric Electromagnetic Bearing |
| CN115654011A (en) * | 2022-10-14 | 2023-01-31 | 珠海格力电器股份有限公司 | Magnetic suspension active three-degree-of-freedom bearing, motor and compressor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5514924A (en) * | 1992-04-30 | 1996-05-07 | AVCON--Advanced Control Technology, Inc. | Magnetic bearing providing radial and axial load support for a shaft |
| KR100701550B1 (en) * | 2005-05-24 | 2007-03-30 | 한국과학기술연구원 | Bearingless Step Motor |
| CN100451363C (en) * | 2007-01-05 | 2009-01-14 | 北京航空航天大学 | PM offset external rotor radial mixed magnetic bearing with redundant structure |
| CN101235848B (en) * | 2008-02-29 | 2010-04-07 | 南京化工职业技术学院 | Low Loss Permanent Magnet Offset Axial Radial Magnetic Bearings |
| BE1020693A3 (en) * | 2012-05-16 | 2014-03-04 | Atlas Copco Aipower Nv | MAGNETIC BEARING AND METHOD FOR MOUNTING A FERROMAGNETIC STRUCTURE AROUND A CORE OF A MAGNETIC BEARING. |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666353A (en) * | 2009-09-23 | 2010-03-10 | 江苏大学 | Active magnetic bearing using bias magnetic flux commonly in radial direction and in axial direction and control method thereof |
| CN115111265A (en) * | 2022-07-21 | 2022-09-27 | 重庆开山流体机械有限公司 | An Asymmetric Electromagnetic Bearing |
| CN115654011A (en) * | 2022-10-14 | 2023-01-31 | 珠海格力电器股份有限公司 | Magnetic suspension active three-degree-of-freedom bearing, motor and compressor |
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