Radial and axial hybrid magnetic bearing

Abstract

The invention discloses a radial and axial hybrid magnetic bearing, which comprises a rotor non-magnetic conductive ring, a stator non-magnetic conductive ring, a plurality of magnetic poles and two rotor magnetic conductive rings, the rotor non-magnetic conductive ring is sleeved outside a rotating shaft, the stator non-magnetic conductive ring is sleeved outside the rotor magnetic conductive ring, each group of magnetic poles are arranged on the stator non-magnetic conductive ring in a surrounding manner, and each group of magnetic poles are arranged on the rotor non-magnetic conductive ring in a surrounding manner. The two magnetic poles in each group are symmetrically arranged at the two ends of the stator non-magnetic-conductive ring, the magnetic poles are provided with windings, notches are formed in the magnetic poles, and the two rotor magnetic-conductive rings are arranged at the two ends of the rotor non-magnetic-conductive ring and 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 is in a suspension state under stress balance; a rotor formed by the rotor magnetic conductive ring, the rotating shaft and the rotor non-magnetic conductive ring does not make mechanical contact with a stator formed by the magnetic pole and the stator non-magnetic conductive ring, and the rotor can reach a very high operation speed.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic bearings, and in particular to a radial-axial hybrid magnetic bearing. Background Art

[0002] Magnetic bearings are a new type of high-performance bearing that separates the rotor and bearings through controlled magnetic field force to achieve no mechanical contact. Existing magnetic bearings are divided into radial magnetic bearings, axial magnetic bearings, and radial-axial permanent magnet hybrid magnetic bearings. Using radial magnetic bearings alone or axial magnetic bearings alone cannot achieve radial and axial suspension of the rotor. Hybrid magnetic bearings can achieve radial and axial suspension of the 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

[0003] In view of the above-mentioned deficiencies in the prior art, the present application provides a radial-axial hybrid magnetic bearing, which can achieve radial and axial suspension of the rotor while avoiding increased losses during no-load operation.

[0004] This embodiment adopts the following technical solutions:

[0005] A radial-axial hybrid magnetic bearing, comprising:

[0006] The rotor non-magnetic conductive ring is defined as follows: the central axis direction of the rotor non-magnetic conductive ring is defined as the axial direction, and the diameter direction of the rotor non-magnetic conductive ring is defined as the radial direction;

[0007] A stator non-magnetic conductive ring is coaxially 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;

[0008] 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

[0009] Two rotor magnetic conductive rings are symmetrically arranged at two axial ends of the rotor non-magnetic conductive ring. The rotor magnetic conductive ring is located in the notch and forms air gaps with the first connecting portion and the fourth connecting portion respectively.

[0010] Furthermore, in the radial-axial hybrid magnetic bearing, the end face of the first connecting portion is an axial magnetic pole face, which is perpendicular to the axial direction, and the end face of the fourth connecting portion is a radial magnetic pole face, which is perpendicular to the radial direction.

[0011] Furthermore, in the radial-axial hybrid magnetic bearing, 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.

[0012] Furthermore, in the radial-axial hybrid magnetic bearing, 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 less 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.

[0013] Furthermore, in the radial-axial hybrid magnetic bearing, the inner diameter of the first connecting portion 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 portion and the rotating shaft.

[0014] Furthermore, in the radial-axial hybrid magnetic bearing, the inner diameter of the fourth connecting portion is larger than the outer diameter of the rotor magnetic conductive ring, so that an air gap is formed between the fourth connecting portion and the rotor magnetic conductive ring.

[0015] Furthermore, in the radial-axial hybrid magnetic bearing, the inner diameter of the first connecting portion is smaller than the outer diameter of the rotor magnetic conductive ring, so that the magnetic circuit generated after the winding is energized can pass through the rotor magnetic conductive ring.

[0016] Furthermore, in the radial-axial hybrid magnetic bearing, the width of the outer side surface of the rotor magnetic ring along the axial direction is greater than the width of the radial magnetic pole surface along the axial direction, so that when the rotor magnetic ring moves up and down, the relative magnetic pole surface does not decrease, thereby ensuring the magnetic attraction force.

[0017] Furthermore, in the radial-axial hybrid magnetic bearing, the outer diameter of the first connecting portion is greater than the inner diameter of the fourth connecting portion, so as to prevent the magnetic circuit from directly passing through the air to reach the magnetic pole surface.

[0018] Furthermore, in the radial-axial hybrid magnetic bearing, the number of the magnetic poles is 4 groups, which surround the stator non-magnetic ring at intervals of 90 degrees, and an angle is formed between the two side surfaces of the magnetic poles, and the angle ranges from 20 degrees to 60 degrees.

[0019] Compared with the prior art, the present application provides a radial-axial hybrid magnetic bearing. Since the rotor magnetic ring is in the gap formed by the first connecting part and the fourth connecting part, after the winding is energized, a radial-axial hybrid 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 will be generated, so that the rotor magnetic ring is simultaneously affected by 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 is in a suspended state under force balance, so that the rotor formed by the rotor magnetic ring, the rotating shaft, and the rotor non-magnetic ring does not have mechanical contact with the magnetic poles and the stator formed by the stator non-magnetic ring, so that the rotor can reach a very high operating speed while avoiding increased losses during the no-load process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a specific embodiment of the radial-axial hybrid magnetic bearing provided in this application.

[0021] Figure 2 for Figure 1 Front view of the radial-axial hybrid magnetic bearing shown.

[0022] Figure 3 for Figure 1 A top view of the radial-axial hybrid magnetic bearing is shown.

[0023] Figure 4 for Figure 1 A cross-sectional view of a partial structure of a radial-axial hybrid magnetic bearing is shown.

[0024] Figure 5 for Figure 4 Annotated schematic diagram.

[0025] Figure 6 for Figure 1 A cross-sectional view of a magnetic pole in a radial-axial hybrid magnetic bearing is shown.

[0026] Figure 7 for Figure 1 Schematic diagram of the magnetic circuit of the rotor non-magnetic ring and magnetic poles in the radial-axial hybrid magnetic bearing.

[0027] Among them, 10, rotor non-magnetic ring; 20, stator non-magnetic ring; 30, magnetic pole; 31, first connection part; 32, second connection part; 33, third connection part; 34, fourth connection part; 40, winding; 50, rotor magnetic ring;

[0028] 100. Rotating shaft; A. Axial magnetic pole surface; B. Radial magnetic pole surface. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] 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.

[0032] See also Figure 1 and Figure 4 The radial-axial hybrid magnetic bearing provided in the present application comprises a rotor non-magnetic ring 10, a stator non-magnetic ring 20, a plurality of magnetic poles 30 and two rotor magnetic rings 50. The rotor non-magnetic ring 10 and the two rotor magnetic rings 50 are both circular ring structures, which can be sequentially sleeved and installed on the rotating shaft 100 and rotate together with the rotating shaft 100.

[0033] The central axis direction of the rotor non-magnetic conductive ring 10 is defined as the axial direction in this embodiment, the diameter direction of the rotor non-magnetic conductive ring 10 is defined as the radial direction in this embodiment, and the two rotor magnetic conductive rings 50 are symmetrically arranged at the axial ends of the rotor non-magnetic conductive ring 10. It can be understood that during normal operation, the rotor non-magnetic conductive ring 10, the two rotor magnetic conductive rings 50 and the rotating shaft 100 can maintain a coaxial relationship.

[0034] The stator non-magnetic ring 20 is sleeved outside the rotor non-magnetic ring 10, and an air gap is formed between the stator non-magnetic ring 20 and the rotor non-magnetic ring 10. When the rotor non-magnetic ring 10 rotates with the rotating shaft 100, the rotor non-magnetic ring 10 and the stator non-magnetic ring 20 do not have mechanical contact, which reduces losses and enables the rotating shaft 100 to reach a very high operating speed.

[0035] For example, both the stator non-magnetic ring 20 and the rotor non-magnetic ring 10 are circular ring structures, and the inner diameter of the stator non-magnetic ring 20 is larger than the outer diameter of the rotor non-magnetic ring 10. When the rotor non-magnetic ring 10 rotates, the rotor non-magnetic ring 10 has a certain horizontal adjustment space inside the stator non-magnetic ring 20. When the rotor non-magnetic ring 10 is coaxial with the stator non-magnetic ring 20, it means that the rotor non-magnetic ring 10 is adjusted to the best position.

[0036] See also Figure 1-Figure 3 , multiple magnetic poles 30 are arranged in groups of two, each group of magnetic poles 30 is arranged around the stator non-magnetic ring 20, and the two magnetic poles 30 in each group are symmetrically arranged at the axial ends of the stator non-magnetic ring 20. A winding 40 is wound around each magnetic pole 30. Figure 6 Each magnetic pole 30 includes a first connecting portion 31, a second connecting portion 32, a third connecting portion 33 and a fourth connecting portion 34. The first connecting portion 31, the second connecting portion 32, the third connecting portion 33 and the fourth connecting portion 34 are sequentially connected and enclosed to form a through groove, and the first connecting portion 31 and the fourth connecting portion 34 are spaced apart to form a gap.

[0037] The two rotor magnetic conductive rings 50 are symmetrically arranged at the two axial ends of the rotor non-magnetic conductive ring 10, and are respectively located at the two gaps. When the winding 40 is energized, a magnetic circuit is generated inside the magnetic pole 30, and the direction of the magnetic circuit is along the first connecting portion 31, the second connecting portion 32, the third connecting portion 33 and the fourth connecting portion 34, or along the fourth connecting portion 34, the third connecting portion 33, the second connecting portion 32 and the first connecting portion 31. Please refer to Figure 7 When the rotor magnetic ring 50 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 magnetic circuit and axial magnetic circuit) is formed in the rotor magnetic ring 50 and the magnetic pole 30.

[0038] It is understandable that after the winding 40 is energized to form a magnetic circuit inside the magnetic pole 30, 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 50 is installed in the gap, and the rotor magnetic ring 50 is not in contact with the magnetic pole 30, so that the rotor magnetic ring 50 and the magnetic pole 30 form an air gap in the radial and axial directions, causing the magnetic pole 30 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 50 is simultaneously subject to radial magnetic attraction and axial magnetic attraction.

[0039] By adjusting the magnitude of the current passing through the winding 40, 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 30 can simultaneously apply radial magnetic attraction and axial magnetic attraction to the rotor magnetic ring 50, so that the rotor magnetic ring 50 is in a suspended state under force balance, so that the rotor magnetic ring 50 and the magnetic poles 30 do not have mechanical contact, reduce losses, and enable the shaft 100 to reach a very high operating speed.

[0040] The rotor non-magnetic ring 10 and the stator non-magnetic ring 20 play the role of isolating the magnetic circuit, so that the magnetic circuits of the two magnetic poles 30 in each group are independent. For example, the rotor magnetic ring 50 is made of silicon steel sheet material, and the rotor non-magnetic ring 10 and the stator non-magnetic ring 20 are made of stainless steel material.

[0041] Changing the direction of the current in the winding 40 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 30 will not have magnetic circuit coupling, and the two magnetic poles 30 in each group of radial magnetic bearings will not have magnetic circuit coupling, making the rotor suspension more stable.

[0042] The first connecting portion 31 , the second connecting portion 32 , the third connecting portion 33 and the fourth connecting portion 34 are used to enclose and form an annular structure including radial and axial directions, thereby forming a radial-axial mixed magnetic circuit.

[0043] The end face of the first connection part 31 is defined as the axial magnetic pole face A, and the axial magnetic pole face 30 is perpendicular to the axial direction; and the end face of the fourth connection part 34 is defined as the radial magnetic pole face B, and the radial magnetic pole face 30 is perpendicular to the radial direction. Therefore, the gap formed by the first connection part 31 and the fourth connection part 34 is located at the corner of the magnetic circuit, and the rotor magnetic conductive ring 50 placed in the gap forms a radial-axial mixed magnetic circuit.

[0044] For example, the first connection portion 31, the second connection portion 32, the third connection portion 33 and the fourth connection portion 34 of each magnetic pole 30 are as follows: Figure 6 As shown, the winding 40 is wound around the second connecting portion 32 .

[0045] Furthermore, the first connection portion 31 is perpendicular to the second connection portion 32, the second connection portion 32 is perpendicular to the third connection portion 33, the third connection portion 33 is perpendicular to the fourth connection portion 34, and the fourth connection portion 34 is perpendicular to the first connection portion 31. The first connection portion 31, the second connection portion 32, the third connection portion 33 and the fourth connection portion 34 are enclosed by being vertically connected in sequence, and a radial-axial hybrid magnetic circuit can be formed.

[0046] The rotor is composed of a rotating shaft 100, two rotor magnetic conductive rings 50 and a rotor non-magnetic conductive ring 10 in the middle, and the stator is composed of a plurality of groups of magnetic poles 30 and a stator non-magnetic conductive ring 20 in the middle of each group of magnetic poles 30. During operation, the rotor is in a suspended state and can be adjusted so that the rotor as a whole and the stator as a whole are kept coaxial.

[0047] In some embodiments, Figure 4 and Figure 5 As shown, the radial dimension of the rotor magnetic ring 50 is the same as the radial dimension of the rotor non-magnetic ring 10, and the axial thickness of the rotor magnetic ring 50 and the stator non-magnetic ring 20 is the same, making the overall structure of the radial-axial hybrid magnetic bearing more reasonable and compact.

[0048] The rotor non-magnetic ring 10 and the two rotor magnetic rings 50 are arranged between the two axial magnetic pole 30 surfaces. The total axial thickness of the rotor non-magnetic ring 10 and the two rotor magnetic rings 50 is less than the spacing between the two axial magnetic pole 30 surfaces, so that an air gap can be formed between the axial magnetic pole 30 surfaces and the end faces of the rotor magnetic rings 50, thereby preventing the rotor magnetic rings 50 from contacting the axial magnetic pole 30 surfaces during rotation, thereby reducing losses.

[0049] The inner diameter R1 of the first connecting portion 31 is larger than the inner diameter r1 of the rotor magnetic ring 50, so that the rotor non-magnetic ring 10 is sleeved on the rotating shaft 100, and when the stator non-magnetic ring 20 and the rotor magnetic ring 50 are coaxial, an air gap can be formed between the first connecting portion 31 and the rotating shaft 100, thereby preventing the rotating shaft 100 from contacting the first connecting portion 31 during rotation, thereby reducing losses.

[0050] The inner diameter R4 of the fourth connection portion 34 is greater than the outer diameter r2 of the rotor magnetic conductive ring 50. When the stator non-magnetic conductive ring 20 and the rotor magnetic conductive ring 50 are coaxial, an air gap can be formed between the radial magnetic pole surface B of the fourth connection portion 34 and the rotor magnetic conductive ring 50, thereby preventing the fourth connection portion 34 from contacting the first connection portion 31 during rotation, thereby reducing losses.

[0051] The inner diameter R1 of the first connection portion 31 is smaller than the outer diameter r2 of the rotor magnetic conductive ring 50. When the stator non-magnetic conductive ring 20 is coaxial with the rotor magnetic conductive ring 50, the projection of the rotor magnetic conductive ring 50 on the first connection portion 31 will partially overlap with the axial magnetic pole surface A, that is, the axial magnetic pole 30 faces the rotor magnetic conductive ring 50, so that the magnetic circuit can pass through the axial magnetic pole 30 surface and the rotor magnetic conductive ring 50, and then the axial magnetic pole 30 faces the rotor magnetic conductive ring 50 to generate magnetic attraction.

[0052] The outer diameter R2 of the first connecting portion 31 is greater than the inner diameter R4 of the fourth connecting portion 34. When the stator non-magnetic conductive ring 20 is coaxial with the rotor magnetic conductive ring 50, the axial magnetic pole 30 surface, the rotor magnetic conductive ring 50 and the radial magnetic pole 30 surface can form a magnetic circuit, thereby preventing the magnetic circuit from directly passing through the air from the axial magnetic pole 30 surface to the radial magnetic pole 30 surface.

[0053] The axial width h1 of the outer side surface of the rotor magnetic ring 50 is approximately the axial width H1 of the radial magnetic pole 30 surface, so that when the rotor magnetic ring 50 moves up and down, the projected area of ​​the radial magnetic pole 30 surface on the rotor magnetic ring 50 does not decrease, thereby avoiding the need to adjust the current of the winding 40 due to the reduction of magnetic attraction.

[0054] For example, when the radial magnetic bearing moves axially upward, the projected area of ​​the radial magnetic pole 30 on the rotor magnetic ring 50 does not decrease, providing sufficient radial suction; similarly, when the radial magnetic bearing moves downward, the projected area of ​​the radial magnetic pole 30 on the rotor magnetic ring 50 does not decrease, providing sufficient radial suction.

[0055] like Figure 3 As shown, in some embodiments, the number of magnetic poles 30 is 4 groups, and the 4 groups of magnetic poles 30 are surrounded by the stator non-magnetic ring 20 at intervals of 90 degrees so as to achieve a force balance state of the rotor.

[0056] Furthermore, an angle is formed between the two side surfaces of the magnetic pole 30, so that the cross section of the magnetic pole 30 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 50 and avoids the situation of magnetic circuit coupling.

[0057] It can be understood that this embodiment combines two 4-pole radial magnetic poles 30 independent radial magnetic bearings, and the independent radial magnetic poles 30 magnetic circuits form axial magnetic bearings through the rotor axial direction, forming a radial-axial hybrid magnetic bearing. 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. The magnetic circuit passes 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 symmetrical 2 or 4 poles of the same radial magnetic bearing.

[0058] Combination Figure 1-Figure 7 In this embodiment, according to the displacement offset of the rotor in the radial X direction, the radial Y direction and the axial Z direction, the upper and lower two groups of 8 coil windings 40 are energized to realize the rotor suspension. The working principle is as follows:

[0059] The four magnetic poles 30 at the upper end of the stator non-magnetic ring 20 are defined as X1+, X1-, Y1+ and Y1- in the X and Y directions respectively, and the four magnetic poles 30 at the lower end of the stator non-magnetic ring 20 are defined as X2+, X2-, Y2+ and Y2- in the X and Y directions respectively, wherein X1+ and X2+ are at corresponding positions at the upper and lower ends of the stator non-magnetic ring 20, X1- and X2- are at corresponding positions at the upper and lower ends of the stator non-magnetic ring 20, Y1+ and Y2+ are at corresponding positions at the upper and lower ends of the stator non-magnetic ring 20, and Y1- and Y2- are at corresponding positions at the upper and lower ends of the stator non-magnetic ring 20.

[0060] When the rotor displacement is offset, the X direction is positive, the Y direction is zero, and the Z direction is zero, the winding 40 of X1- and the winding 40 of X2- 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 magnetic poles 30 of X1- and the magnetic poles 30 of X2- in the Z direction cancel each other out, thereby realizing the movement of the rotor to the negative direction of X and back to the original position.

[0061] When the rotor displacement is offset, the X direction is negative, the Y direction is zero, and the Z direction is zero, the winding 40 of X1+ and the winding 40 of X2+ 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 30 of X1+ and the magnetic pole 30 of X2+ in the Z direction cancel each other out, thereby realizing the movement of the rotor to the positive direction of X and back to the original position.

[0062] When the rotor displacement is offset, the Y direction is positive, the X direction is zero, and the Z direction is zero, the Y1- and Y2- windings 40 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 Y1- magnetic pole 30 and the Y2- magnetic pole 30 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.

[0063] 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 40 of Y1+ and the winding 40 of Y2+ 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 poles 30 of Y1+ and the magnetic poles 30 of Y2+ in the Z direction cancel each other out, thereby realizing the movement of the rotor to the positive direction of the Y direction back to its original position.

[0064] When the rotor displacement is offset in both the X and Y directions and is zero in the Z direction, the X winding 40 and the Y winding 40 with opposite offset directions in the X and Y directions are energized to subject the rotor to electromagnetic attraction in opposite directions of the offset, so that the rotor returns to its original position.

[0065] When the rotor displacement is offset, the X direction is zero, the Y direction is zero, and the Z direction is negative (downward), the winding 40 of X1 and the winding 40 of Y1 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 magnetic pole 30 of X1+ and the magnetic pole 30 of X1- in the X direction cancel each other out, and the electromagnetic attraction generated by the magnetic pole 30 of Y1+ and the magnetic pole 30 of Y1- in the Y direction cancel each other out, thereby realizing the movement of the rotor to the positive direction of Z and back to its original position.

[0066] 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 winding 40 of X2 and the winding 40 of Y2 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 magnetic pole 30 of X2+ and the magnetic pole 30 of X2- in the X direction cancel each other out, and the electromagnetic attraction generated by the magnetic pole 30 of Y2+ and the magnetic pole 30 of Y2- in the Y direction cancel each other out, thereby realizing the movement of the rotor to the negative Z direction back to its original position.

[0067] 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 radial-axial hybrid magnetic bearing, characterized in that: include: The rotor non-magnetic conductive ring is defined as follows: the central axis direction of the rotor non-magnetic conductive ring is defined as the axial direction, and the diameter direction of the rotor non-magnetic conductive ring is defined as the radial direction; A stator non-magnetic conductive ring is coaxially 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 symmetrically arranged at two axial ends of the rotor non-magnetic conductive ring. The rotor magnetic conductive ring is located in the notch and forms air gaps with the first connecting portion and the fourth connecting portion respectively.

2. The radial-axial hybrid magnetic bearing 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.

3. The radial-axial hybrid magnetic bearing according to claim 2, 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.

4. The radial-axial hybrid magnetic bearing according to claim 2, 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.

5. The radial-axial hybrid magnetic bearing according to claim 3, characterized in that: The inner diameter of the first connecting portion is greater 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 portion and the rotating shaft.

6. The radial-axial hybrid magnetic bearing according to claim 3, characterized in that: The inner diameter of the fourth connecting portion is greater than the outer diameter of the rotor magnetic conductive ring, so that an air gap is formed between the fourth connecting portion and the rotor magnetic conductive ring.

7. The radial-axial hybrid magnetic bearing according to claim 3, characterized in that: The inner diameter of the first connecting portion is smaller than the outer diameter of the rotor magnetic conductive ring.

8. The radial-axial hybrid magnetic bearing according to claim 3, 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.

9. The radial-axial hybrid magnetic bearing according to claim 3, characterized in that: An outer diameter of the first connecting portion is greater than an inner diameter of the fourth connecting portion.

10. The radial-axial hybrid magnetic bearing 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. An angle is formed between the two side surfaces of the magnetic poles, and the range of the angle is 20 degrees to 60 degrees.

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