Magnetic suspension motor

Abstract

A magnetic suspension motor disclosed by the present invention comprises a motor main body and a radial and axial hybrid magnetic bearing, the motor main body comprises a rotating shaft, a motor rotor and a motor stator, the radial and axial hybrid magnetic bearing comprises a rotor non-magnetic ring, a stator non-magnetic ring, multiple groups of magnetic poles and two rotor magnetic rings, the rotor non-magnetic ring sleeves the rotating shaft, and the stator non-magnetic ring sleeves the rotating shaft. The stator non-magnetic ring is sleeved outside the rotor magnetic rings, each group of magnetic poles are arranged on the stator non-magnetic ring in a surrounding mode, the two magnetic poles in each group are symmetrically arranged at two ends of the stator non-magnetic ring, windings are arranged on the magnetic poles, notches are formed in the magnetic poles, and the two rotor magnetic rings are located in the notches. After the winding is electrified, a radial and axial mixed magnetic circuit can be generated, so that the rotor magnetic conductive ring is subjected to the effects of radial electromagnetic attraction and axial electromagnetic attraction at the same time, and the rotor magnetic conductive ring and the rotating shaft are in a suspension state under stress balance and do not make mechanical contact with a motor stator and a stator non-magnetic conductive ring during operation; and the rotating shaft can reach a very high running speed.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a magnetic levitation motor. Background Art

[0002] A magnetic levitation motor is a special motor that operates without mechanical contact between the stator and rotor. During operation, it can be supported by magnetic bearings, that is, the rotor and bearings are separated by controlled magnetic field force, so that the bearings support the rotor without mechanical contact.

[0003] Existing magnetic bearings are divided into radial magnetic bearings, axial magnetic bearings, and radial-axial permanent magnet hybrid magnetic bearings. The magnetic levitation motor using only radial magnetic bearings or only axial magnetic bearings cannot achieve radial and axial suspension of the rotor. Hybrid magnetic bearings can achieve radial and axial suspension of the magnetic levitation motor rotor, but they mostly use a permanent magnet biased structure, which will increase the loss of the rotor during no-load. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present application provides a magnetic levitation motor that can achieve radial and axial suspension of the rotor while avoiding increased losses during the no-load process.

[0005] This embodiment adopts the following technical solutions:

[0006] A magnetic levitation motor comprises a motor body and a radial-axial hybrid magnetic bearing, wherein the motor body comprises a rotating shaft, a motor rotor and a motor stator which are sleeved in sequence, and the radial-axial hybrid magnetic bearing comprises:

[0007] A rotor non-magnetic conductive ring, sleeved on the rotating shaft;

[0008] A stator non-magnetic conductive ring is fixed to the motor stator and sleeved outside the rotor non-magnetic conductive ring, and an air gap is formed between the stator non-magnetic conductive ring and the rotor non-magnetic conductive ring;

[0009] A plurality of magnetic poles, two in a group, each group of magnetic poles is arranged around the stator non-magnetic conductive ring, and the two magnetic poles in each group are symmetrically arranged at the axial ends of the stator non-magnetic conductive ring, a winding is wound around the magnetic pole, and the magnetic pole includes a first connecting portion, a second connecting portion, a third connecting portion and a fourth connecting portion which are sequentially connected and enclosed to form a through slot, and a gap is formed between the first connecting portion and the fourth connecting portion; and

[0010] Two rotor magnetic conductive rings are sleeved on the rotating shaft and symmetrically arranged at the axial ends of the rotor non-magnetic conductive ring. The rotor magnetic conductive rings are located in the notch and form air gaps with the first connecting portion and the fourth connecting portion respectively.

[0011] Furthermore, in the magnetic levitation motor, the number of the rotor non-magnetic rings is two, and the motor rotor is located between the two rotor non-magnetic rings; the number of the stator non-magnetic rings is two, and the motor stator is located between the two stator non-magnetic rings.

[0012] Furthermore, in the magnetic levitation motor, the number of the magnetic poles is 4 groups, which surround the stator non-magnetic ring at intervals of 90 degrees.

[0013] Furthermore, in the magnetic levitation motor, an angle is formed between two side surfaces of the magnetic pole, and the angle ranges from 20 degrees to 60 degrees.

[0014] Furthermore, in the magnetic levitation motor, the end face of the first connection portion is an axial magnetic pole face, which is perpendicular to the axial direction, and the end face of the fourth connection portion is a radial magnetic pole face, which is perpendicular to the radial direction.

[0015] Furthermore, in the magnetic levitation motor, the first connection portion is perpendicular to the second connection portion, the second connection portion is perpendicular to the third connection portion, the third connection portion is perpendicular to the fourth connection portion, and the fourth connection portion is perpendicular to the first connection portion.

[0016] Furthermore, in the magnetic levitation motor, the rotor non-magnetic ring and the two rotor magnetic rings are arranged between the two axial magnetic pole faces, and the total thickness of the rotor non-magnetic ring and the two rotor magnetic rings along the axial direction is smaller than the spacing between the two axial magnetic pole faces, so that an air gap is formed between the axial magnetic pole face and the end face of the rotor magnetic ring.

[0017] Furthermore, in the magnetic levitation motor, the inner diameter of the first connecting part is larger than the inner diameter of the rotor magnetic ring, so that when the rotor non-magnetic ring is sleeved on the rotating shaft, an air gap is formed between the first connecting part and the rotating shaft, and the inner diameter of the fourth connecting part is larger than the outer diameter of the rotor magnetic ring, so that an air gap is formed between the fourth connecting part and the rotor magnetic ring.

[0018] Furthermore, in the magnetic levitation motor, the inner diameter of the first connecting portion is smaller than the outer diameter of the rotor magnetic conductive ring, and the outer diameter of the first connecting portion is larger than the inner diameter of the fourth connecting portion.

[0019] Furthermore, in the magnetic levitation motor, the width of the outer side surface of the rotor magnetic conductive ring along the axial direction is greater than the width of the radial magnetic pole surface along the axial direction.

[0020] Compared with the prior art, the present application provides a magnetic levitation motor, in which a rotor magnetic ring mounted on the rotating shaft is located in a gap formed by a first connecting part and a fourth connecting part. After the winding is energized, a radial-axial mixed magnetic circuit passing through the first connecting part, the second connecting part, the third connecting part, the fourth connecting part and the rotor magnetic ring is generated, so that the rotor magnetic ring is simultaneously subjected to radial electromagnetic attraction and axial electromagnetic attraction. Multiple groups of magnetic poles can simultaneously apply radial magnetic attraction and axial magnetic attraction to the rotor magnetic ring, so that the rotor magnetic ring and the rotating shaft are in a suspended state under force balance, and no mechanical contact is generated with the motor stator and the stator non-magnetic ring during operation, so that the rotating shaft can reach a very high operating speed while avoiding increased losses during no-load operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A cross-sectional view of a specific embodiment of the magnetic levitation motor provided in the present application.

[0022] Figure 2 This is a schematic diagram of the overall structure of a specific embodiment of the radial-axial hybrid magnetic bearing provided in this application.

[0023] Figure 3 for Figure 2 Front view of the radial-axial hybrid magnetic bearing shown.

[0024] Figure 4 for Figure 2 A top view of the radial-axial hybrid magnetic bearing is shown.

[0025] Figure 5 for Figure 2 A cross-sectional view of a radial-axial hybrid magnetic bearing is shown.

[0026] Figure 6 for Figure 5 Annotated schematic diagram of .

[0027] Figure 7 for Figure 2 A cross-sectional view of a magnetic pole in a radial-axial hybrid magnetic bearing is shown.

[0028] Figure 8 for Figure 2 Schematic diagram of the magnetic circuit of the rotor non-magnetic ring and magnetic poles in the radial-axial hybrid magnetic bearing.

[0029] Among them, 10, motor body; 11, rotating shaft; 12, motor rotor; 13, motor stator;

[0030] 20. Radial-axial hybrid magnetic bearing; 21. Rotor non-magnetic ring; 22. Stator non-magnetic ring; 23. Magnetic pole; 231. First connecting part; 232. Second connecting part; 233. Third connecting part; 234. Fourth connecting part; A. Axial magnetic pole surface; B. Radial magnetic pole surface; 24. Winding; 25. Rotor magnetic ring. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and effect of the present application clearer and more specific, the present application is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. Without further description, the elements, structures and features in one embodiment can also be beneficially combined with other embodiments.

[0032] It should be noted that when a metastructure is referred to as being "fixed to" or "set on" another metastructure, it may be directly on the other metastructure or indirectly on the other metastructure. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0033] The orientation or positional relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element structure referred to must have a specific orientation, be constructed and operate in a specific orientation.

[0034] See also Figure 1 The magnetic levitation motor provided in the present application includes a motor body 10 and a radial-axial hybrid magnetic bearing 20. The motor body 10 includes a rotating shaft 11, a motor rotor 12 and a motor stator 13. The motor rotor 12 is sleeved on the rotating shaft 11, the motor stator 13 is sleeved outside the motor rotor 12, and the radial-axial hybrid magnetic bearing 20 is sleeved on the rotating shaft 11.

[0035] The motor stator 13 can be fixed on the motor housing, and the motor rotor 12 located inside the motor stator 13 can rotate freely, and the motor stator 13 and the motor rotor 12 are separated by a certain air gap to maintain relative movement.

[0036] The radial-axial hybrid magnetic bearing 20 supports the rotating shaft 11. Figure 2 and Figure 5 The radial-axial hybrid magnetic bearing 20 provided in the present application includes a rotor non-magnetic ring 21, a stator non-magnetic ring 22, a plurality of magnetic poles 23 and two rotor magnetic rings 25. The rotor non-magnetic ring 21 and the two rotor magnetic rings 25 are both circular ring structures, which can be sequentially sleeved and installed on the rotating shaft 11 and rotate together with the rotating shaft 11.

[0037] The central axis direction of the rotating shaft 11 is defined as the axial direction in this embodiment, and the diameter direction of the rotating shaft 11 is defined as the radial direction in this embodiment. It can be understood that during normal operation of the magnetic levitation motor, the rotating shaft 11, the motor rotor 12, the motor stator 13, the rotor non-magnetic ring 21 and the two rotor magnetic rings 25 can maintain a coaxial relationship, and the two rotor magnetic rings 25 are symmetrically arranged at the axial ends of the rotor non-magnetic ring 21.

[0038] The stator non-magnetic ring 22 is fixed to the motor stator 13, and the stator non-magnetic ring 22 is sleeved outside the rotor non-magnetic ring 21, and an air gap is formed between the stator non-magnetic ring 22 and the rotor non-magnetic ring 21. When the rotor non-magnetic ring 21 rotates with the rotating shaft 11, the rotor non-magnetic ring 21 and the stator non-magnetic ring 22 do not have mechanical contact, which reduces losses and enables the rotating shaft 11 to reach a very high operating speed.

[0039] For example, the stator non-magnetic ring 22 and the rotor non-magnetic ring 21 are both circular ring structures, and the inner diameter of the stator non-magnetic ring 22 is larger than the outer diameter of the rotor non-magnetic ring 21. When the rotor non-magnetic ring 21 rotates, the rotor non-magnetic ring 21 has a certain horizontal adjustment space inside the stator non-magnetic ring 22. When the rotor non-magnetic ring 21 is coaxial with the stator non-magnetic ring 22, it means that the rotor non-magnetic ring 21 is adjusted to the optimal position.

[0040] See also Figure 2-Figure 4 , multiple magnetic poles 23 are arranged in groups of two, each group of magnetic poles 23 is arranged around the stator non-magnetic ring 22, and the two magnetic poles 23 in each group are symmetrically arranged at the axial ends of the stator non-magnetic ring 22. A winding 24 is wound around each magnetic pole 23. Figure 7 Each magnetic pole 23 includes a first connecting portion 231, a second connecting portion 232, a third connecting portion 233 and a fourth connecting portion 234. The first connecting portion 231, the second connecting portion 232, the third connecting portion 233 and the fourth connecting portion 234 are sequentially connected and enclosed to form a through groove, and the first connecting portion 231 and the fourth connecting portion 234 are spaced apart to form a gap.

[0041] The two rotor magnetic conductive rings 25 are symmetrically arranged at the two axial ends of the rotor non-magnetic conductive ring 21, and are respectively located at the two gaps. When the winding 24 is energized, a magnetic circuit is generated inside the magnetic pole 23, and the direction of the magnetic circuit is along the first connecting portion 231, the second connecting portion 232, the third connecting portion 233 and the fourth connecting portion 234, or along the fourth connecting portion 234, the third connecting portion 233, the second connecting portion 232 and the first connecting portion 231. Please refer to Figure 8 When the rotor magnetic ring 25 is in the gap and located at the corner of the magnetic circuit, a radial-axial mixed magnetic circuit (that is, it includes both radial and axial magnetic circuits) is formed in the rotor magnetic ring 25 and the magnetic pole 23.

[0042] It is understandable that after the winding 24 is energized to form a magnetic circuit inside the magnetic pole 23, the magnetic attraction force generated always causes the magnet to move in the direction of reducing the magnetic resistance. For example, when a magnet in the air is close to an iron block, the iron block will be subject to the magnetic attraction force of the magnet. In this embodiment, the rotor magnetic ring 25 is installed in the gap, and the rotor magnetic ring 25 is not in contact with the magnetic pole 23, so that the rotor magnetic ring 25 and the magnetic pole 23 form an air gap in the radial and axial directions, causing the magnetic pole 23 to generate a magnetic attraction force on the rotor magnet in the direction of reducing the magnetic resistance of the air gap, that is, the rotor magnetic ring 25 is simultaneously subject to radial magnetic attraction and axial magnetic attraction.

[0043] By adjusting the magnitude of the current passing through the winding 24, the magnitude of the magnetic circuit can be changed, and thus the magnitude of the magnetic attraction can be changed. The multiple groups of magnetic poles 23 can simultaneously apply radial magnetic attraction and axial magnetic attraction to the rotor magnetic ring 25, so that the rotor magnetic ring 25 is in a suspended state under force balance, so that the rotor magnetic ring 25 and the magnetic poles 23 do not have mechanical contact, reduce losses, and enable the shaft 11 to reach a very high operating speed.

[0044] The rotor non-magnetic ring 21 and the stator non-magnetic ring 22 play the role of isolating the magnetic circuit, so that the magnetic circuits of the two magnetic poles 23 in each group are independent. For example, the rotor magnetic ring 25 is made of silicon steel sheet material, and the rotor non-magnetic ring 21 and the stator non-magnetic ring 22 are made of stainless steel material.

[0045] Changing the direction of the current in the winding 24 can change the direction of the magnetic circuit, but the current direction does not affect the magnitude of the radial suspension force and the axial suspension force. The radial magnetic bearings formed by different groups of magnetic poles 23 will not have magnetic circuit coupling, and the two magnetic poles 23 in each group of radial magnetic bearings will not have magnetic circuit coupling, making the rotor suspension more stable.

[0046] The first connecting portion 231 , the second connecting portion 232 , the third connecting portion 233 and the fourth connecting portion 234 are used to enclose and form an annular structure including radial and axial directions, thereby forming a radial-axial mixed magnetic circuit.

[0047] The end face of the first connection part 231 is defined as the axial magnetic pole face A, and the axial magnetic pole face A is perpendicular to the axial direction; and the end face of the fourth connection part 234 is defined as the radial magnetic pole face B, and the radial magnetic pole face B is perpendicular to the radial direction. Therefore, the gap formed by the first connection part 231 and the fourth connection part 234 is located at the corner of the magnetic circuit, and the rotor magnetic conductive ring 25 placed in the gap forms a radial-axial mixed magnetic circuit.

[0048] For example, the first connection portion 231, the second connection portion 232, the third connection portion 233 and the fourth connection portion 234 of each magnetic pole 23 are as follows: Figure 7 As shown in the division method, the winding 24 is wound around the second connecting portion 232 .

[0049] Furthermore, the first connection portion 231 is perpendicular to the second connection portion 232, the second connection portion 232 is perpendicular to the third connection portion 233, the third connection portion 233 is perpendicular to the fourth connection portion 234, and the fourth connection portion 234 is perpendicular to the first connection portion 231. The first connection portion 231, the second connection portion 232, the third connection portion 233 and the fourth connection portion 234 are enclosed by being vertically connected in sequence, and a radial-axial hybrid magnetic circuit can be formed.

[0050] The rotor of the radial-axial hybrid magnetic bearing 20 is composed of two rotor magnetic conductive rings 25 and a rotor non-magnetic conductive ring 21 in the middle, and the stator of the radial-axial hybrid magnetic bearing 20 is composed of multiple groups of magnetic poles 23 and a stator non-magnetic conductive ring 22 in the middle of each group of magnetic poles 23. During operation, the rotor of the radial-axial hybrid magnetic bearing 20 is in a suspended state, and can be adjusted to keep the rotor of the radial-axial hybrid magnetic bearing 20 and the stator of the radial-axial hybrid magnetic bearing 20 as a whole coaxial, thereby keeping the rotating shaft 11 and the stator of the radial-axial hybrid magnetic bearing 20 as a whole coaxial.

[0051] In some embodiments, Figure 5 and Figure 6 As shown, the radial dimension of the rotor magnetic ring 25 is the same as the radial dimension of the rotor non-magnetic ring 21, and the axial thickness of the rotor magnetic ring 25 and the stator non-magnetic ring 22 is the same, making the overall structure of the radial-axial hybrid magnetic bearing 20 more reasonable and compact.

[0052] The rotor non-magnetic ring 21 and the two rotor magnetic rings 25 are arranged between the two axial magnetic pole surfaces. The total axial thickness of the rotor non-magnetic ring 21 and the two rotor magnetic rings 25 is smaller than the spacing between the two axial magnetic pole surfaces, so that an air gap can be formed between the axial magnetic pole surface and the end surface of the rotor magnetic ring 25, thereby preventing the rotor magnetic ring 25 from contacting the axial magnetic pole surface during rotation, thereby reducing losses.

[0053] The inner diameter R of the first connecting portion 231 is larger than the inner diameter r of the rotor magnetic ring 25, so that the rotor non-magnetic ring 21 is sleeved behind the rotating shaft 11, and when the stator non-magnetic ring 22 and the rotor magnetic ring 25 are coaxial, an air gap can be formed between the first connecting portion 231 and the rotating shaft 11, thereby preventing the rotating shaft 11 from contacting the first connecting portion 231 during rotation, thereby reducing losses.

[0054] The inner diameter R of the fourth connection portion 234 is greater than the outer diameter r of the rotor magnetic conductive ring 25. When the stator non-magnetic conductive ring 22 and the rotor magnetic conductive ring 25 are coaxial, an air gap can be formed between the radial magnetic pole surface B of the fourth connection portion 234 and the rotor magnetic conductive ring 25, thereby preventing the fourth connection portion 234 from contacting the first connection portion 231 during rotation, thereby reducing losses.

[0055] The inner diameter R of the first connection portion 231 is smaller than the outer diameter r of the rotor magnetic conductive ring 25. When the stator non-magnetic conductive ring 22 is coaxial with the rotor magnetic conductive ring 25, the projection of the rotor magnetic conductive ring 25 on the first connection portion 231 will partially overlap with the axial magnetic pole surface A, that is, the axial magnetic pole surface is aligned with the rotor magnetic conductive ring 25, so that the magnetic circuit can pass through the axial magnetic pole surface and the rotor magnetic conductive ring 25, and then the axial magnetic pole surface generates magnetic attraction to the rotor magnetic conductive ring 25.

[0056] The outer diameter R of the first connecting portion 231 is greater than the inner diameter R of the fourth connecting portion 234. When the stator non-magnetic ring 22 is coaxial with the rotor magnetic ring 25, the axial magnetic pole surface, the rotor magnetic ring 25 and the radial magnetic pole surface can form a magnetic circuit to prevent the magnetic circuit from directly passing through the air from the axial magnetic pole surface to the radial magnetic pole surface.

[0057] The axial width h of the outer side surface of the rotor magnetic ring 25 is approximately the axial width H of the radial magnetic pole surface, so that when the rotor magnetic ring 25 moves up and down, the projected area of ​​the radial magnetic pole surface on the rotor magnetic ring 25 does not decrease, thereby avoiding the need to adjust the current of the winding 24 due to the reduction of magnetic attraction.

[0058] For example, when the radial magnetic bearing moves axially upward, the projected area of ​​the radial magnetic pole surface on the rotor magnetic ring 25 does not decrease, providing sufficient radial suction; similarly, when the radial magnetic bearing moves downward, the projected area of ​​the radial magnetic pole surface on the rotor magnetic ring 25 does not decrease, providing sufficient radial suction.

[0059] When the rotating shaft 11 is supported by the radial-axial hybrid magnetic bearing 20 , a radial-axial hybrid magnetic bearing 20 may be provided at each end of the rotating shaft 11 to support the rotating shaft 11 from both ends, so that the support of the rotating shaft 11 is more stable.

[0060] Or, if Figure 1 As shown, in some embodiments, the number of rotor non-magnetic rings 21 can be set to two, so that the motor rotor 12 is located between the two rotor non-magnetic rings 21; at the same time, the number of stator non-magnetic rings 22 can be set to two, so that the motor stator 13 is located between the two stator non-magnetic rings 22.

[0061] In this case, since the two rotor non-magnetic rings 21 and the two stator non-magnetic rings 22 are separated from each other, the two rotor non-magnetic rings 21, the two stator non-magnetic rings 22, the corresponding two magnetic poles 23 and the two rotor magnetic rings 25 can be respectively arranged at the two ends of the rotating shaft 11. The radial suspension and axial suspension of the rotating shaft 11 can be achieved through a radial-axial hybrid magnetic bearing 20, and the support of the rotating shaft 11 can be made more stable.

[0062] like Figure 4As shown, in some embodiments, the number of the magnetic poles 23 is 4 groups, and the 4 groups of magnetic poles 23 are arranged around the stator non-magnetic ring 22 at intervals so as to achieve a force balance state for the rotor.

[0063] Furthermore, an angle is formed between the two side surfaces of the magnetic pole 23, so that the cross section of the magnetic pole 23 is fan-shaped. The angle ranges from 20 degrees to 60 degrees, which ensures that there is sufficient magnetic attraction to the rotor magnetic ring 25 and avoids the situation of magnetic circuit coupling.

[0064] It can be understood that this embodiment combines two radial magnetic bearings with four independent radial magnetic poles, and the independent radial magnetic pole magnetic circuits form an axial magnetic bearing through the rotor axial direction, forming a radial-axial hybrid magnetic bearing 20. The magnetic circuits of each radial magnetic bearing are independent, and the suspension control in the X and Y directions of the radial plane is independent and uncoupled. The radial magnetic bearing works alone through the axial direction, thereby causing axial coupling. The axial coupling suspension force is decoupled by the symmetrical and simultaneous operation of the axial magnetic circuits of the two radial magnetic bearings. Axially suspended radial magnetic bearings working alone will generate radial suspension force, and the decoupling of the radial suspension force is achieved by the simultaneous operation of the symmetrical two or four poles of the same radial magnetic bearing.

[0065] Combination Figure 1-Figure 8 In this embodiment, according to the radial X direction, radial Y direction and axial Z direction displacement offset of the rotor, the upper and lower two groups of 8 coil windings 24 are energized to realize the suspension of the rotor (including the shaft 11, the motor rotor 12, the rotor non-magnetic ring 21 and the rotor magnetic ring 25). The working principle is as follows:

[0066] The four magnetic poles 23 at the upper end of the stator non-magnetic ring 22 are defined as X+, X-, Y+ and Y- in the X and Y directions respectively, and the four magnetic poles 23 at the lower end of the stator non-magnetic ring 22 are defined as X+, X-, Y+ and Y- in the X and Y directions respectively, wherein X+ and X+ are at corresponding positions at the upper and lower ends of the stator non-magnetic ring 22, X- and X- are at corresponding positions at the upper and lower ends of the stator non-magnetic ring 22, Y+ and Y+ are at corresponding positions at the upper and lower ends of the stator non-magnetic ring 22, and Y- and Y- are at corresponding positions at the upper and lower ends of the stator non-magnetic ring 22.

[0067] When the rotor displacement is offset, the X direction is positive, the Y direction is zero, and the Z direction is zero, the X- winding 24 and the X- winding 24 are energized in the same direction, generating an electromagnetic attraction in the negative direction of the X direction, and the electromagnetic attraction in the Y direction is zero. The electromagnetic attraction generated by the X- magnetic pole 23 and the X- magnetic pole 23 in the Z direction cancel each other out, thereby realizing the movement of the rotor to the negative direction of the X direction back to its original position.

[0068] When the rotor displacement is offset, it is negative in the X direction, zero in the Y direction, and zero in the Z direction, the winding 24 of X+ and the winding 24 of X+ are energized in the same direction, generating an electromagnetic attraction in the positive direction of the X direction, and the electromagnetic attraction in the Y direction is zero. The electromagnetic attraction generated by the magnetic pole 23 of X+ and the magnetic pole 23 of X+ in the Z direction cancel each other out, thereby realizing the movement of the rotor to the positive direction of X and back to its original position.

[0069] When the rotor displacement is offset, the Y direction is positive, the X direction is zero, and the Z direction is zero, the Y- and Y- windings 24 are energized in the same direction, generating an electromagnetic attraction in the negative direction of the Y direction, and the electromagnetic attraction in the X direction is zero. The electromagnetic attraction generated by the Y- magnetic pole 23 and the Y- magnetic pole 23 in the Z direction cancel each other out, thereby realizing the movement of the rotor to the negative direction of the Y direction back to its original position.

[0070] When the rotor displacement is offset, it is negative in the Y direction, zero in the X direction, and zero in the Z direction, the winding 24 of Y+ and the winding 24 of Y+ are energized in the same direction, generating an electromagnetic attraction in the positive direction of the Y direction, and the electromagnetic attraction in the X direction is zero. The electromagnetic attraction generated by the magnetic pole 23 of Y+ and the magnetic pole 23 of Y+ in the Z direction cancel each other out, thereby realizing the movement of the rotor to the positive direction of Y and back to its original position.

[0071] When the rotor displacement is offset in both the X and Y directions and zero in the Z direction, the X winding 24 and the Y winding 24 with opposite offset directions in the X and Y directions are energized to respectively subject the rotor to electromagnetic attraction in opposite directions of the offset, so that the rotor returns to its original position.

[0072] When the rotor displacement is offset, the X direction is zero, the Y direction is zero, and the Z direction is negative (downward), the X winding 24 and the Y winding 24 are energized in the same direction, generating an electromagnetic attraction in the positive direction (upward) of the Z direction, and the electromagnetic attraction in the X and Y directions is zero. The electromagnetic attraction generated by the X+ magnetic pole 23 and the X- magnetic pole 23 in the X direction cancel each other out, and the electromagnetic attraction generated by the Y+ magnetic pole 23 and the Y- magnetic pole 23 in the Y direction cancel each other out, thereby realizing the rotor moving in the positive Z direction back to the original position.

[0073] When the rotor displacement is offset, when the X direction is zero, the Y direction is zero, and the Z direction is positive (upward), the X winding 24 and the Y winding 24 are energized in the same direction, generating an electromagnetic attraction in the negative direction (downward) of the Z direction, and the electromagnetic attraction in the X and Y directions is zero. The electromagnetic attraction generated by the X+ magnetic pole 23 and the X- magnetic pole 23 in the X direction cancel each other out, and the electromagnetic attraction generated by the Y+ magnetic pole 23 and the Y- magnetic pole 23 in the Y direction cancel each other out, thereby realizing the rotor moving in the negative Z direction back to the original position.

[0074] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and application concept of the present application, and all these changes or substitutions should fall within the protection scope of the claims attached to the present application.

Claims

1. A magnetic levitation motor, characterized in that: It includes a motor body and a radial-axial hybrid magnetic bearing, wherein the motor body includes a rotating shaft, a motor rotor and a motor stator which are sleeved in sequence, and the radial-axial hybrid magnetic bearing includes: A rotor non-magnetic conductive ring, sleeved on the rotating shaft; A stator non-magnetic conductive ring is fixed to the motor stator and sleeved outside the rotor non-magnetic conductive ring, and an air gap is formed between the stator non-magnetic conductive ring and the rotor non-magnetic conductive ring; A plurality of magnetic poles, two in a group, each group of magnetic poles is arranged around the stator non-magnetic conductive ring, and the two magnetic poles in each group are symmetrically arranged at the axial ends of the stator non-magnetic conductive ring, a winding is wound around the magnetic pole, and the magnetic pole includes a first connecting portion, a second connecting portion, a third connecting portion and a fourth connecting portion which are sequentially connected and enclosed to form a through slot, and a gap is formed between the first connecting portion and the fourth connecting portion; and Two rotor magnetic conductive rings are sleeved on the rotating shaft and symmetrically arranged at the axial ends of the rotor non-magnetic conductive ring. The rotor magnetic conductive rings are located in the notch and form air gaps with the first connecting portion and the fourth connecting portion respectively.

2. The magnetic levitation motor according to claim 1, characterized in that: The number of the rotor non-magnetic conductive rings is two, and the motor rotor is located between the two rotor non-magnetic conductive rings. The number of the stator non-magnetic conductive rings is two, and the motor stator is located between the two stator non-magnetic conductive rings.

3. The magnetic levitation motor according to claim 1, characterized in that: The number of the magnetic poles is 4 groups, which surround the stator non-magnetic ring at intervals of 90 degrees.

4. The magnetic levitation motor according to claim 3, characterized in that: An angle is formed between the two side surfaces of the magnetic pole, and the range of the angle is 20 degrees to 60 degrees.

5. The magnetic levitation motor according to claim 1, characterized in that: The end surface of the first connecting portion is an axial magnetic pole surface, and the axial magnetic pole surface is perpendicular to the axial direction. The end surface of the fourth connecting portion is a radial magnetic pole surface, and the radial magnetic pole surface is perpendicular to the radial direction.

6. The magnetic levitation motor according to claim 5, characterized in that: The first connection portion is perpendicular to the second connection portion, the second connection portion is perpendicular to the third connection portion, the third connection portion is perpendicular to the fourth connection portion, and the fourth connection portion is perpendicular to the first connection portion.

7. The magnetic levitation motor according to claim 5, characterized in that: The rotor non-magnetic ring and the two rotor magnetic rings are arranged between the two axial magnetic pole faces. The total thickness of the rotor non-magnetic ring and the two rotor magnetic rings along the axial direction is smaller than the spacing between the two axial magnetic pole faces, so that an air gap is formed between the axial magnetic pole face and the end face of the rotor magnetic ring.

8. The magnetic levitation motor according to claim 5, characterized in that: The inner diameter of the first connecting part is larger than the inner diameter of the rotor magnetic conductive ring, so that when the rotor non-magnetic conductive ring is sleeved on the rotating shaft, an air gap is formed between the first connecting part and the rotating shaft, and the inner diameter of the fourth connecting part is larger than the outer diameter of the rotor magnetic conductive ring, so that an air gap is formed between the fourth connecting part and the rotor magnetic conductive ring.

9. The magnetic levitation motor according to claim 5, characterized in that: The inner diameter of the first connecting portion is smaller than the outer diameter of the rotor magnetic conductive ring, and the outer diameter of the first connecting portion is larger than the inner diameter of the fourth connecting portion.

10. The magnetic levitation motor according to claim 5, characterized in that: The width of the outer side surface of the rotor magnetic conductive ring along the axial direction is greater than the width of the radial magnetic pole surface along the axial direction.

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