Active and passive magnetic bearing structure with radial vibration suppression effect

Abstract

The invention discloses an active and passive magnetic bearing structure with a radial vibration suppression effect, and relates to the technical field of magnetic suspension bearings, and the active and passive magnetic bearing structure comprises an annular stator magnetizer which is internally provided with an annular cavity, and the inner wall of an annular hole of the annular cavity is provided with an annular opening; the rotor assembly comprises a rotor shaft and a thrust disc; the rotor shaft is arranged in a ring hole of the stator magnetizer; the thrust disc sleeves the periphery of the rotor shaft, and the peripheral side of the thrust disc movably penetrates through the annular opening; the axial control coil is coaxially nested in the annular cavity; a stator permanent magnet I and a rotor permanent magnet I; the stator permanent magnet I is coaxially fixed at one end of the stator magnetizer so as to form a magnetic field at the annular opening; the rotor permanent magnet I and the stator permanent magnet I are both axially magnetized, and opposite magnetic poles are opposite to each other; the conductor vibration suppression disc is located between the first rotor permanent magnet and the first stator permanent magnet. The radial vibration of the rotor can be effectively suppressed, the size is small, and the operation stability is high.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic suspension bearings, and in particular to an active and passive magnetic bearing structure with radial vibration suppression function. Background Art

[0002] Magnetic bearings use magnetic force to suspend the rotor in the air gap. They have the advantages of no friction, no oil pollution, high speed, and active control. They are suitable for high-precision, high-vacuum and ultra-clean applications. Magnetic bearings can be divided into active and passive types according to the way the magnetic force is provided. Active magnetic bearings refer to magnetic bearings whose bearing force can be actively controlled with the help of electromagnets, feedback control loops, sensors, power amplifiers and other units. Passive magnetic bearings refer to magnetic bearings whose bearing force only comes from the permanent magnets themselves. Active magnetic bearings can achieve extremely micro vibration of the rotor through high-precision control algorithms, but their closed-loop feedback control systems are composed of sensors, controllers, power amplifiers, etc., which are large in size, power consumption and cost. Passive magnetic bearings have a simple structure, do not require a control system, do not consume energy, and have high reliability. However, passive magnetic bearings have low inherent damping. When the supported parts undergo displacement vibration during actual application, they cannot effectively suppress the vibration of the rotor, affecting the reliability of the system. The currently commonly used method is to add an active control coil on the basis of passive magnetic bearings, but this requires corresponding control boards and sensors, which greatly increases the system cost, volume and complexity, and reduces reliability. Active and passive hybrid magnetic bearings can combine the characteristics of the above-mentioned two types of magnetic bearings, give full play to the advantages of active magnetic bearings with high control accuracy, small vibration and high stability, and at the same time reduce the loss and volume of active magnetic bearings; however, existing active and passive magnetic bearing systems generally only integrate the two types of magnetic bearings in physical space, and still require a large number of electromagnetic components, which cannot simplify the control structure, making it difficult to miniaturize the volume, the equipment applicability is low, and the radial vibration suppression effect is poor.

[0003] Therefore, how to propose an active and passive magnetic bearing structure with radial vibration suppression function, which can automatically and effectively suppress radial vibration of the rotor when it occurs, so as to reduce the vibration amplitude of the rotor, and has the characteristics of small size and high operating stability is a problem that technical personnel in this field need to solve urgently. Summary of the invention

[0004] In view of this, the present invention proposes an active passive magnetic bearing structure with radial vibration suppression effect, aiming to solve the technical problems of the above-mentioned traditional active passive hybrid magnetic bearings being large in size, poor in radial vibration suppression effect and low in operating stability.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] The present invention provides an active and passive magnetic bearing structure with radial vibration suppression function, comprising:

[0007] The stator magnetizer is annular and has an annular cavity extending in the circumferential direction; the inner wall of the annular hole of the stator magnetizer is provided with an annular opening extending in the circumferential direction and communicating with the annular cavity;

[0008] A rotor assembly, the rotor assembly comprising a rotor shaft and a thrust plate; the rotor shaft is coaxially arranged in the annular hole of the stator magnetizer; the thrust plate is coaxially sleeved on the outer peripheral wall of the rotor shaft, and its outer peripheral side movably penetrates the annular opening; there are preset axial active adjustment gaps between the two side disk surfaces of the thrust plate and the corresponding inner wall surfaces of the annular opening;

[0009] an axial control coil coaxially nested in the annular cavity and used to form a regulating magnetic field between opposite inner walls of the annular opening;

[0010] A stator permanent magnet 1 and a rotor permanent magnet 1; the stator permanent magnet is coaxially sleeved outside the rotor shaft and fixed at one end of the stator magnetizer to form a magnetic field in opposite directions at the inner wall surface of the annular opening; the rotor permanent magnet is coaxially sleeved on the rotor shaft and corresponds to the side of the stator permanent magnet 1 away from the stator magnetizer; the rotor permanent magnet 1 and the stator permanent magnet 1 are both axially magnetized and have opposite magnetic poles to each other, so as to provide radial passive restoring force for the rotor shaft;

[0011] A conductor vibration suppression disk is coaxially sleeved on the rotor shaft and located between the rotor permanent magnet 1 and the stator permanent magnet 1; a preset axial passive adjustment gap is provided between the conductor vibration suppression disk and the stator permanent magnet 1.

[0012] The combination of the stator permanent magnet 1 and the rotor permanent magnet 1 of the active-passive combined magnetic bearing structure of the present invention forms a radial passive magnetic bearing; when the rotor shaft is radially offset, the radial restoring force between the stator permanent magnet 1 and the rotor permanent magnet 1 will make the rotor shaft return to the equilibrium position. When the rotor shaft vibrates radially, the stator permanent magnet 1 and the rotor permanent magnet 1 deviate radially, and the magnetic flux acting on the surface of the conductor vibration suppression disk will alternate. The changing magnetic flux induces eddy currents, forming eddy current losses, thereby converting the vibration energy into loss heat and consuming it, thereby suppressing the radial vibration. The permanent magnetic flux generated by the stator permanent magnet 1 and the rotor permanent magnet 1 of the active and passive combined magnetic bearing structure of the present invention forms a working magnetic flux at a preset axial active adjustment gap between the disk surfaces on both sides of the thrust disk and the inner wall surface of the annular opening, providing a bias magnetic flux for the axial magnetic bearing; when the rotor shaft undergoes axial displacement, the axial control coil forms an adjustment magnetic field between the relative inner walls of the annular opening by controlling the current, and the adjustment magnetic field generated by the axial control coil and the bias magnetic field generated by the stator permanent magnet 1 and the rotor permanent magnet 1 are superimposed to change the strength of the magnetic field in the preset axial active adjustment gap, thereby generating an actively adjustable axial electromagnetic force to ensure the stability of the axial position of the rotor shaft.

[0013] As a further improvement of the above technical solution, there are multiple stator permanent magnets and rotor permanent magnets; the multiple stator permanent magnets are all annular and arranged concentrically and radially at intervals, and are all fixed at one end of the stator magnetizer; the multiple rotor permanent magnets are all annular and arranged concentrically and radially at intervals, and are all mounted on the rotor shaft; the multiple rotor permanent magnets axially correspond one by one to the multiple stator permanent magnets; the conductor vibration suppression disk corresponds between the multiple stator permanent magnets and the multiple rotor permanent magnets.

[0014] The beneficial effect of the above technical solution is that a plurality of stator permanent magnets arranged concentrically and radially at intervals and a plurality of rotor permanent magnets arranged concentrically and radially at intervals are arranged relative to each other in the axial direction to form a greater rigidity and radial vibration suppression effect.

[0015] As a further improvement of the above technical solution, it also includes a magnetic flux collecting and isolating component, which includes a magnetic flux collecting ring and a magnetic flux isolating ring; the magnetic flux collecting ring is provided at the end of each of the plurality of rotor permanent magnets close to the conductor vibration suppression disk; the magnetic flux isolating ring is provided between any two adjacent stator permanent magnets, between any two adjacent rotor permanent magnets, and between any two adjacent magnetic flux collecting rings.

[0016] The beneficial effects of the above technical scheme are: the magnetic concentrator ring plays the role of gathering permanent magnetic flux and can improve the passive stiffness and vibration suppression effect; the non-magnetic magnetic isolation ring plays the role of separating adjacent magnetic concentrator rings, adjacent stator permanent magnets 1 and adjacent rotor permanent magnets 1, so as to further improve the structural stiffness and stability.

[0017] As a further improvement of the above technical solution, the magnetic focusing ring is made of high magnetic permeability material.

[0018] The beneficial effect of the above technical solution is that the magnetic concentrating ring made of high magnetic permeability material can further concentrate the concentrated permanent magnetic flux to penetrate the conductor vibration suppression disk, thereby further increasing the radial eddy current vibration suppression effect while improving the passive stiffness.

[0019] As a further improvement of the above technical solution, it also includes stator permanent magnet 2 and rotor permanent magnet 2; the stator permanent magnet 2 is coaxially sleeved on the outside of the rotor shaft and fixed to the other end of the stator magnetizer; the stator permanent magnet 2 is coaxially sleeved on the rotor shaft and corresponds to the side of the stator permanent magnet 2 away from the stator magnetizer; the stator permanent magnet 2 and the rotor permanent magnet 2 are both axially magnetized and have opposite magnetic poles to each other, so as to provide radial passive restoring force for the rotor shaft; the stator permanent magnet 2 and the stator permanent magnet 1 are arranged opposite to each other along the axial same magnetic poles of the stator magnetizer.

[0020] The beneficial effects of the above technical solution are: the combination of stator permanent magnet 2 and rotor permanent magnet 2 forms a radial passive magnetic bearing, forming a structure in which radial passive magnetic bearings are symmetrically arranged at both ends of the stator magnetizer, further increasing the stability of the rotor shaft operation; stator permanent magnet 2 cooperates with stator permanent magnet 1 to make the magnetic field distribution in the preset axial active adjustment gap more balanced.

[0021] As a further improvement of the above technical solution, the rotor shaft and the thrust plate are both made of magnetic conductive materials.

[0022] The beneficial effect of the above technical solution is that the rotor shaft and thrust plate made of magnetic conductive material can reduce the magnetic loss of the permanent magnetic circuit formed by stator permanent magnet 1 and rotor permanent magnet 1 and the permanent magnetic circuit formed by stator permanent magnet 2 and rotor permanent magnet 2, which is conducive to miniaturizing the volume of the permanent magnetic structure.

[0023] As a further improvement of the above technical solution, the stator permanent magnet 1 and the rotor permanent magnet 1 are both made of ferrite permanent magnet material or rare earth permanent magnet material.

[0024] As a further improvement of the above technical solution, the conductor vibration suppression disk is made of a high conductivity material and has a thickness of 1-2 mm.

[0025] The beneficial effect of the above technical solution is that the conductor vibration suppression disk made of high conductivity material can generate larger eddy currents in the conductor vibration suppression disk when radial vibration occurs in the rotor shaft, thereby damping the radial vibration and achieving a stronger vibration suppression effect.

[0026] As a further improvement of the above technical solution, the axial control coil is wound with copper wire with a wire diameter of 0.2mm-1mm.

[0027] As a further improvement of the above technical solution, the preset axial active adjustment gap is 0.1mm-1mm; the preset axial passive adjustment gap is 1mm-2mm.

[0028] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses an active and passive magnetic bearing structure with radial vibration suppression, which has the following advantages and beneficial effects:

[0029] 1. The active-passive combined magnetic bearing structure of the present invention realizes that the radial passive magnetic bearing and the axial active magnetic bearing share electromagnetic components, thereby achieving a small volume of the overall structure.

[0030] 2. The radial passive control and axial active control of the active-passive combined magnetic bearing structure of the present invention only require one coil and one control loop, which greatly reduces power consumption.

[0031] 3. The active-passive combined magnetic bearing structure of the present invention integrates a passive radial vibration suppression link, thereby reducing the vibration of the rotor shaft and increasing the operating stability.

[0032] 4. The active-passive combined magnetic bearing structure of the present invention adopts an upper and lower double group of passive permanent magnet ring structures (stator permanent magnet one and rotor permanent magnet one form one group of permanent magnet rings, and stator permanent magnet two and rotor permanent magnet two form another group of permanent magnet rings), which can achieve the upper and lower offset of the axial suction force of the radial passive part, thereby making the operation more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0034] Figure 1 A schematic axial cross-sectional view of an active and passive magnetic bearing structure with radial vibration suppression function according to the present invention;

[0035] Figure 2 A schematic diagram of a permanent magnetic circuit of a stator permanent magnet 1 and a rotor permanent magnet 1 of an active and passive magnetic bearing structure with radial vibration suppression in the present invention;

[0036] Figure 3 A schematic diagram of the electromagnetic magnetic circuit generated by the axial control coil of an active and passive magnetic bearing structure with radial vibration suppression function according to the present invention;

[0037] Figure 4 A schematic diagram of the installation state of the second stator permanent magnet and the second rotor permanent magnet of an active and passive magnetic bearing structure with radial vibration suppression function according to the present invention;

[0038] Figure 5 A schematic diagram of a permanent magnetic circuit of a stator permanent magnet 1 and a rotor permanent magnet 1, and a permanent magnetic circuit of a stator permanent magnet 2 and a rotor permanent magnet 2 of an active passive magnetic bearing structure with radial vibration suppression of the present invention;

[0039] Figure 6 A schematic diagram of an electromagnetic magnetic circuit generated by an axial control coil when two stator permanent magnets and two rotor permanent magnets are provided in an active passive magnetic bearing structure with radial vibration suppression function according to the present invention;

[0040] In the figure: 1. stator magnet; 11. annular cavity; 12. annular opening; 121. preset axial active adjustment gap; 2. rotor assembly; 21. rotor shaft; 22. thrust plate; 23. magnetic ring; 3. axial control coil; 4. stator permanent magnet one; 5. rotor permanent magnet one; 6. conductor vibration suppression plate; 61. preset axial passive adjustment gap; 7. magnetic focusing and magnetic isolation assembly; 71. magnetic focusing ring; 72. magnetic isolation ring; 8. stator permanent magnet two; 9. rotor permanent magnet two. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] According to an embodiment of the present invention, Figure 1 As shown, an active and passive magnetic bearing structure with radial vibration suppression function includes:

[0046] The stator magnetizer 1 is annular and has an annular cavity 11 extending in the circumferential direction therein; the inner wall of the annular hole of the stator magnetizer 1 is provided with an annular opening 12 extending in the circumferential direction and communicating with the annular cavity 11;

[0047] The rotor assembly 2 comprises a rotor shaft 21 and a thrust plate 22; the rotor shaft 21 is coaxially arranged in the annular hole of the stator magnetizer 1; the thrust plate 22 is coaxially sleeved on the outer peripheral wall of the rotor shaft 21, and its outer peripheral side movably penetrates the annular opening 12; there is a preset axial active adjustment gap 121 between the disk surfaces on both sides of the thrust plate 22 and the inner wall surfaces of the corresponding annular opening 12;

[0048] An axial control coil 3, which is coaxially nested in the annular cavity 11 and is used to form a regulating magnetic field between opposite inner walls of the annular opening 12;

[0049] Stator permanent magnet 14 and rotor permanent magnet 15; stator permanent magnet 14 is coaxially sleeved outside the rotor shaft 21 and fixed to one end of the stator magnetizer 1 to form a magnetic field in the opposite direction at the inner wall surface of the annular opening 12; rotor permanent magnet 15 is coaxially sleeved on the rotor shaft 21 and corresponds to the side of stator permanent magnet 14 away from the stator magnetizer 1; rotor permanent magnet 15 and stator permanent magnet 14 are both axially magnetized and have opposite magnetic poles to each other, so as to provide radial passive restoring force for the rotor shaft 21;

[0050] The conductor vibration suppression disk 6 is coaxially sleeved on the rotor shaft 21 and is located between the rotor permanent magnet 5 and the stator permanent magnet 4 ; a preset axial passive adjustment gap 61 is provided between the conductor vibration suppression disk 6 and the stator permanent magnet 4 .

[0051] The combination of the stator permanent magnet 14 and the rotor permanent magnet 15 of the active-passive combined magnetic bearing structure of this embodiment forms a radial passive magnetic bearing; when the rotor shaft 21 is radially offset, the radial restoring force between the stator permanent magnet 14 and the rotor permanent magnet 15 will make the rotor shaft 21 return to the equilibrium position. When the rotor shaft 21 vibrates radially, the stator permanent magnet 14 and the rotor permanent magnet 15 deviate radially, and the magnetic flux acting on the surface of the conductor vibration suppression disk 6 will alternate, and the changing magnetic flux will induce eddy currents, forming eddy current losses, thereby converting the vibration energy into loss heat and consuming it, thereby suppressing the radial vibration. The permanent magnetic flux generated by the stator permanent magnet 4 and the rotor permanent magnet 5 of the active and passive combined magnetic bearing structure of the present invention forms a working magnetic flux at the preset axial active adjustment gap 121 between the disk surfaces on both sides of the thrust disk 22 and the inner wall surface of the annular opening 12, providing a bias magnetic flux for the axial magnetic bearing; when the rotor shaft 21 has axial displacement, the axial control coil 3 forms an adjustment magnetic field between the relative inner walls of the annular opening 12 by controlling the current, and the adjustment magnetic field generated by the axial control coil 3 and the bias magnetic field generated by the stator permanent magnet 4 and the rotor permanent magnet 5 are superimposed to change the strength of the magnetic field in the preset axial active adjustment gap 121, thereby generating an actively adjustable axial electromagnetic force to ensure the stability of the axial position of the rotor shaft 21.

[0052] For details, see Figure 2 and Figure 3 The working principle of the axial active control of the rotor shaft 21 is as follows: Assuming that the rotor shaft 21 is placed vertically, Figure 2 The solid line loop with arrows is the magnetic flux path generated by the stator permanent magnet 4 and the rotor permanent magnet 5, which generates magnetic flux in opposite directions in the air gaps on both sides of the thrust plate 22, which can be marked as φp 上 ,φp 下 The magnetic flux path generated by the energized axial control coil 3 is as follows: Figure 3 As shown in the dotted line loop with arrows, a magnetic flux with the same direction is generated in the air gap on both sides of the thrust plate 22, which can be marked as φi 上 、φi 下 Therefore, the total magnetic flux in the air gap on both sides of the thrust plate 22 is: φp on the upper side 上 +φi 上 , the lower side is φp 下 -φi 下 Obviously, the magnetic flux on the upper side of the thrust disk 22 is higher than the magnetic flux on the lower side of the thrust disk 22, thus generating an upward suction force on the thrust disk 22. Similarly, when a reverse current flows through the axial control coil 3, a downward suction force will be generated on the thrust disk 22. Therefore, by controlling the magnitude and direction of the current in the axial control coil 3, active control of the axial direction of the rotor shaft 21 can be achieved.

[0053] Specifically, the stator magnetizer 1 is made of magnetic conductive material, and can be made of iron; for example, electrical pure iron or low carbon steel can be selected.

[0054] In some embodiments, there are multiple stator permanent magnets 4 and rotor permanent magnets 5; the multiple stator permanent magnets 4 are all annular and arranged concentrically and radially at intervals, and are all fixed to one end of the stator magnetizer 1; the multiple rotor permanent magnets 5 are all annular and arranged concentrically and radially at intervals, and are all mounted on the rotor shaft 21; the multiple rotor permanent magnets 5 axially correspond one by one to the multiple stator permanent magnets 4; the conductor vibration suppression disk 6 corresponds between the multiple stator permanent magnets 4 and the multiple rotor permanent magnets 5.

[0055] A plurality of stator permanent magnets 4 arranged concentrically and radially at intervals and a plurality of rotor permanent magnets 5 arranged concentrically and radially at intervals are arranged relatively to each other in the axial direction to form a greater rigidity and radial vibration suppression effect.

[0056] In some embodiments, it also includes a magnetic field collecting and isolating component 7, which includes a magnetic field collecting ring 71 and a magnetic field isolating ring 72; a magnetic field collecting ring 71 is provided at the end of multiple rotor permanent magnets 5 close to the conductor vibration suppression disk 6; a magnetic field isolating ring 72 is provided between any two adjacent stator permanent magnets 4, between any two adjacent rotor permanent magnets 5, and between any two adjacent magnetic field collecting rings 71.

[0057] The magnetic flux collecting ring 71 collects the permanent magnetic flux and can improve the passive stiffness and vibration suppression effect; the non-magnetic magnetic isolation ring 72 separates the adjacent magnetic flux collecting rings 71, the adjacent stator permanent magnets 4 and the adjacent rotor permanent magnets 5, so as to further improve the structural stiffness and stability.

[0058] In some embodiments, the magnetic focusing ring 71 is made of a material with high magnetic permeability.

[0059] The magnetic concentrating ring 71 made of high magnetic permeability material can further concentrate the concentrated permanent magnetic flux to penetrate the conductor vibration suppression disk 6, thereby further increasing the radial eddy current vibration suppression effect while improving the passive stiffness.

[0060] Specifically, the high magnetic permeability material can be electrical pure iron or Permalloy, etc.; the thickness of the magnetic focusing ring 71 can be the same as the thickness of the rotor permanent magnet 5.

[0061] In some embodiments, see Figure 4The active and passive combined magnetic bearing structure also includes a stator permanent magnet 28 and a rotor permanent magnet 29; the stator permanent magnet 28 is coaxially sleeved on the outside of the rotor shaft 21 and fixed to the other end of the stator magnetizer 1; the stator permanent magnet 28 is coaxially sleeved on the rotor shaft 21 and corresponds to the side of the stator permanent magnet 28 away from the stator magnetizer 1; the stator permanent magnet 28 and the rotor permanent magnet 29 are both axially magnetized and have opposite magnetic poles to each other, so as to provide radial passive restoring force for the rotor shaft 21; the stator permanent magnet 28 and the stator permanent magnet 14 are arranged oppositely along the axial same magnetic poles of the stator magnetizer 1.

[0062] Specifically, the stator permanent magnet 8 and the rotor permanent magnet 9 are arranged with a spacing therebetween in the axial direction, and the spacing between the stator permanent magnet 8 and the rotor permanent magnet 9 constitutes an axial passive adjustment gap.

[0063] The combination of stator permanent magnet 2 8 and rotor permanent magnet 2 9 forms a radial passive magnetic bearing, forming a structure in which radial passive magnetic bearings are symmetrically arranged at both ends of the stator magnetizer 1, further increasing the stability of the operation of the rotor shaft 21; the stator permanent magnet 2 8 cooperates with the stator permanent magnet 1 4 to make the magnetic field distribution in the preset axial active adjustment gap 121 more balanced.

[0064] It should be noted that the stator permanent magnet 14, the rotor permanent magnet 15, the stator permanent magnet 28 and the rotor permanent magnet 29 are all annular and can have the same thickness, and are all axially magnetized. The radial passive magnetic bearings are divided into two groups, one of which includes the stator permanent magnet 14 and the rotor permanent magnet 15 used in pairs, and the other group includes the stator permanent magnet 28 and the rotor permanent magnet 29 used in pairs; the two groups of radial passive magnetic bearings are symmetrically arranged at both ends of the axial direction of the stator magnetizer 1. The polar position relationship between the stator and rotor permanent magnets can make the permanent magnetic flux form a loop, and a radial restoring force is formed between the stator and rotor, thereby playing the role of radial passive suspension.

[0065] For details, see Figure 5 and Figure 6 The working principle of the axial active control of the rotor shaft 21 is as follows: Assuming that the rotor shaft 21 is placed vertically, Figure 5 The solid line loop with arrows is the magnetic flux path generated by the stator permanent magnet 1 4 and the rotor permanent magnet 1 5, as well as the stator permanent magnet 2 8 and the rotor permanent magnet 2 9; magnetic fluxes with opposite directions are generated in the air gaps on both sides of the thrust plate 22, which can be marked as φp up and φp down. The magnetic flux path generated by the energized axial control coil 3 is as follows: Figure 6As shown in the dotted loop with arrows, magnetic fluxes of the same direction are generated in the air gaps on both sides of the thrust disk 22, which can be marked as φi up and φi down. Therefore, the total magnetic flux in the air gaps on both sides of the thrust disk 22 is: φp up + φi up on the upper side, and φp down - φi down on the lower side; obviously, the magnetic flux on the upper side of the thrust disk 22 is higher than the magnetic flux on the lower side of the thrust disk 22; therefore, an upward suction force is generated on the thrust disk 22. Similarly, when a reverse current is passed through the axial control coil 3, a downward suction force will be generated on the thrust disk 22. Therefore, by controlling the magnitude and direction of the current in the axial control coil 3, active control of the axial direction of the rotor shaft 21 can be achieved.

[0066] In some embodiments, the rotor shaft 21 and the thrust plate 22 are both made of magnetic conductive materials.

[0067] The rotor shaft 21 and thrust plate 22 made of magnetic conductive material can reduce the magnetic loss of the permanent magnetic circuit formed by the stator permanent magnet 4 and the rotor permanent magnet 5 and the permanent magnetic circuit formed by the stator permanent magnet 2 8 and the rotor permanent magnet 2 9, which is conducive to miniaturization of the permanent magnetic structure.

[0068] Specifically, the rotor shaft 21 and the thrust plate 22 may be made of 40Cr, GCr15, or the like.

[0069] In some embodiments, the stator permanent magnet 4 and the rotor permanent magnet 5 are both made of ferrite permanent magnet material or rare earth permanent magnet material.

[0070] In some embodiments, the conductor vibration suppression disk 6 is made of a high conductivity material, and its thickness is 1-2 mm. The high conductivity material may be copper, that is, the conductor vibration suppression disk 6 may be an annular copper disk.

[0071] The conductor vibration suppression disk 6 made of high conductivity material can generate a large eddy current in the conductor vibration suppression disk 6 when the rotor shaft 21 vibrates radially, thereby damping the radial vibration and achieving a stronger vibration suppression effect.

[0072] In some embodiments, the axial control coil 3 is wound with copper wire having a wire diameter of 0.2 mm-1 mm.

[0073] In some embodiments, the preset axial active adjustment gap 121 is 0.1 mm-1 mm; the preset axial passive adjustment gap 61 is 1 mm-2 mm.

[0074] In some embodiments, the rotor assembly 2 also includes a magnetic ring 23; the magnetic ring 23 can be made of materials such as pure iron, 40Cr or GCr15; the magnetic ring 23 is fixed on the rotor shaft 21, and the rotor permanent magnet 1 5, the rotor permanent magnet 2 9, the magnetic focusing ring 71 and the conductor vibration suppression disk 6 are all fixedly connected to the rotor shaft 21 through the magnetic ring 23.

[0075] Specifically, the conductor vibration suppression disk 6 is fitted and fixed on the end face of the magnetic focusing ring 71 away from the rotor permanent magnet 5; the magnetic isolation ring 72 and the corresponding stator permanent magnet 4, rotor permanent magnet 5 and magnetic focusing ring 71 are coaxially nested and fixed by tight fit or bonding.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0077] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An active and passive magnetic bearing structure with radial vibration suppression function, characterized in that: include: A stator magnetizer (1), the stator magnetizer (1) being annular and having an annular cavity (11) extending in the circumferential direction provided therein; an annular opening (12) extending in the circumferential direction and communicating with the annular cavity (11) being provided on the inner wall of the annular hole of the stator magnetizer (1); A rotor assembly (2), the rotor assembly (2) comprising a rotor shaft (21) and a thrust disk (22); the rotor shaft (21) is coaxially arranged in the annular hole of the stator magnetizer (1); the thrust disk (22) is coaxially sleeved on the outer peripheral wall of the rotor shaft (21), and its outer peripheral side movably penetrates the annular opening (12); there is a preset axial active adjustment gap between the disk surfaces on both sides of the thrust disk (22) and the corresponding inner wall surfaces of the annular opening (12); an axial control coil (3), the axial control coil (3) being coaxially nested in the annular cavity (11) and used for forming a regulating magnetic field between opposite inner walls of the annular opening (12); A stator permanent magnet (4) and a rotor permanent magnet (5); the stator permanent magnet (4) is coaxially sleeved outside the rotor shaft (21) and fixed to one end of the stator magnetizer (1) to form magnetic fields with opposite directions at the inner wall surface of the annular opening (12); the rotor permanent magnet (5) is coaxially sleeved on the rotor shaft (21) and corresponds to the side of the stator permanent magnet (4) away from the stator magnetizer (1); the rotor permanent magnet (5) and the stator permanent magnet (4) are both axially magnetized and have opposite magnetic poles to each other, so as to provide radial passive restoring force for the rotor shaft (21); A conductor vibration suppression disk (6), wherein the conductor vibration suppression disk (6) is coaxially sleeved on the rotor shaft (21) and is located between the rotor permanent magnet one (5) and the stator permanent magnet one (4); a preset axial passive adjustment gap is provided between the conductor vibration suppression disk (6) and the stator permanent magnet one (4).

2. The active and passive magnetic bearing structure with radial vibration suppression function according to claim 1, characterized in that: The stator permanent magnet (4) and the rotor permanent magnet (5) are both multiple; the multiple stator permanent magnets (4) are all annular and arranged concentrically and radially at intervals, and are all fixed to one end of the stator magnetizer (1); the multiple rotor permanent magnets (5) are all annular and arranged concentrically and radially at intervals, and are all mounted on the rotor shaft (21); the multiple rotor permanent magnets (5) axially correspond one-to-one to the multiple stator permanent magnets (4); the conductor vibration suppression disk (6) corresponds between the multiple stator permanent magnets (4) and the multiple rotor permanent magnets (5).

3. The active and passive magnetic bearing structure with radial vibration suppression function according to claim 2, characterized in that: It also includes a magnetic field collecting and isolating component (7), wherein the magnetic field collecting and isolating component (7) includes a magnetic field collecting ring (71) and a magnetic field isolating ring (72); the ends of the plurality of rotor permanent magnets (5) close to the conductor vibration suppression disk (6) are each provided with the magnetic field collecting ring (71); and the magnetic field isolating ring (72) is each provided between any two adjacent stator permanent magnets (4), between any two adjacent rotor permanent magnets (5), and between any two adjacent magnetic field collecting rings (71).

4. The active and passive magnetic bearing structure with radial vibration suppression function according to claim 3, characterized in that: The magnetic focusing ring (71) is made of a material with high magnetic permeability.

5. The active-passive combined magnetic bearing structure with radial vibration suppression function according to claim 1, characterized in that: It also includes a second stator permanent magnet (8) and a second rotor permanent magnet (9); the second stator permanent magnet (8) is coaxially sleeved on the outside of the rotor shaft (21) and fixed to the other end of the stator magnetizer (1); the second stator permanent magnet (8) is coaxially sleeved on the rotor shaft (21) and corresponds to the side of the second stator permanent magnet (8) away from the stator magnetizer (1); the second stator permanent magnet (8) and the second rotor permanent magnet (9) are both axially magnetized and have opposite magnetic poles to each other, so as to provide radial passive restoring force for the rotor shaft (21); the second stator permanent magnet (8) and the first stator permanent magnet (4) are arranged oppositely along the axial direction of the stator magnetizer (1) with like magnetic poles.

6. The active and passive magnetic bearing structure with radial vibration suppression function according to claim 1, characterized in that: The rotor shaft (21) and the thrust plate (22) are both made of magnetically conductive material.

7. The active-passive combined magnetic bearing structure with radial vibration suppression function according to claim 1, characterized in that: The stator permanent magnet one (4) and the rotor permanent magnet one (5) are both made of ferrite permanent magnet material or rare earth permanent magnet material.

8. The active and passive magnetic bearing structure with radial vibration suppression function according to claim 1, characterized in that: The conductor vibration suppression disk (6) is made of a material with high electrical conductivity and has a thickness of 1-2 mm.

9. The active and passive magnetic bearing structure with radial vibration suppression function according to claim 1, characterized in that: The axial control coil (3) is wound with copper wire having a wire diameter of 0.2 mm-1 mm.

10. The active and passive magnetic bearing structure with radial vibration suppression function according to claim 1, characterized in that: The preset axial active adjustment gap is 0.1mm-1mm; the preset axial passive adjustment gap is 1mm-2mm.

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