Rotating shaft assembly for magnetic suspension motor and magnetic suspension motor

Abstract

The utility model relates to the technical field of magnetic suspension motors, in particular to a rotating shaft assembly for a magnetic suspension motor and the magnetic suspension motor. The rotating shaft assembly for the magnetic suspension motor comprises a rotating shaft, a first rotor lamination layer, a motor rotor, a second rotor lamination layer and a pressing ring, the rotating shaft comprises a first body section and a second body section in the axial direction of the rotating shaft, and the outer diameter of the first body section is larger than that of the second body section; the first rotor lamination layer, the motor rotor and the second rotor lamination layer are sequentially arranged on the first body section in a sleeving manner; the hold-down ring comprises a first hold-down section and a second hold-down section which are connected in sequence, at least part of the inner circumferential surface of the first hold-down section is in contact with the outer circumferential surface of the first body section, and the inner circumferential surface of the second hold-down section is in threaded fit with the outer circumferential surface of the second body section. Unbalance of the rotating shaft assembly caused by a gap in threaded fit between the hold-down ring and the rotating shaft is relieved, and the effects that tightening torque can be accurately applied, assembly inclination of the hold-down ring is prevented, and it is guaranteed that the rotating shaft assembly has good dynamic balance are achieved.

Description

Technical Field

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

[0002] In a magnetic levitation permanent magnet motor, radial magnetic rotor laminations, spacer rings, permanent magnets and other components are assembled on the shaft. While the inner surface of each component is close to the outer surface of the shaft for radial positioning, the shaft end of the shaft relies on the rotor threaded ring to axially press the radial magnetic rotor laminations, spacer rings, permanent magnets and other components assembled on the shaft, and the components on the shaft assembly are not allowed to loosen during the high-speed rotation of the shaft. At present, the rotor threaded ring relies on the thread on the inner surface to fit with the thread on the outer surface of the shaft to press the various components on the shaft assembly, but the thread fit will cause a gap between the shaft and the threaded ring in the radial direction, and the threaded ring is prone to deflection, resulting in uneven quality of the shaft assembly, which in turn affects the performance of the magnetic levitation motor. Utility Model Content

[0003] The present application provides a shaft assembly and a magnetic levitation motor for a magnetic levitation motor, which alleviate the technical problem of imbalance of the shaft assembly caused by the gap between the clamping ring and the shaft due to the threaded fit, and achieves the technical effect of accurately implementing the tightening torque, alleviating the inclination of the clamping ring assembly, and ensuring that the shaft assembly has good dynamic balance.

[0004] In order to achieve the above objectives, the main technical solutions adopted in this application include:

[0005] In a first aspect, an embodiment of the present application provides a shaft assembly for a magnetic levitation motor, comprising a shaft, a first rotor laminate, a motor rotor, a second rotor laminate, and a clamping ring, wherein along the axial direction of the shaft, the shaft comprises a first body section and a second body section, and the outer diameter of the first body section is greater than that of the second body section; along the axial direction of the shaft, the first rotor laminate, the motor rotor, and the second rotor laminate are sequentially sleeved on the first body section; along the axial direction of the shaft, the clamping ring comprises a first clamping section and a second clamping section connected in sequence, at least a portion of the inner circumference of the first clamping section contacts the outer circumference of the first body section, and the inner circumference of the second clamping section is threadedly matched with the outer circumference of the second body section.

[0006] The shaft assembly for a magnetic levitation motor proposed in the embodiment of the present application is divided into two sections with different outer diameters, namely, a first main body section and a second main body section, and the clamping ring is divided into a first clamping section and a second clamping section. The first clamping section is at least partially sleeved on the first main body section, and the inner circumference of the first clamping section contacts the outer circumference of the first main body section, and the inner circumference of the second clamping section is threadedly matched with the outer circumference of the second main body section. The clamping ring is positioned radially so that the axis of the clamping ring coincides with the axis of the shaft, which alleviates the phenomenon of the clamping ring assembly tilting and reduces the phenomenon of the clamping ring deflection caused by the thread gap between the clamping ring and the shaft, thereby ensuring that the shaft assembly has good dynamic balance.

[0007] Optionally, the first clamping section has a first hole matched with the first body section, and the first hole is interference-fitted with the first body section. The clamping ring is sleeved on the first body section through the first hole and is interference-fitted with the first body section, so as to alleviate the phenomenon that the clamping ring and the rotating shaft cannot be accurately positioned due to the gap, realize the positioning of the clamping ring in the radial direction, and ensure that the clamping ring can be firmly installed in the first body section.

[0008] Optionally, along the axial direction of the rotating shaft, the projection of the outer peripheral surface of the second clamping section is a polygon. When the clamping ring is installed on the rotating shaft, the clamping ring needs to be tightened, because the circular surface is very easy to slip during the tightening process. The clamping ring is designed to be a polygon, which is convenient for using a torque wrench to determine the tightening torque, improves work efficiency, and reduces the slippage of the clamping ring during the tightening process.

[0009] Optionally, along the axial direction of the rotating shaft, the projection of the outer circumference of the first pressing section is circular. The first pressing section with a circular outer circumference can be used as a detection surface for detecting the radial offset of the rotating shaft.

[0010] Optionally, the shaft assembly further comprises a first spacer and a second spacer, wherein the first spacer is arranged between the first rotor lamination and the motor rotor, and the second spacer is arranged between the second rotor lamination and the motor rotor; wherein, along the axial direction of the shaft, the clamping ring is suitable for clamping the second rotor lamination, the second spacer and the motor rotor. The first spacer is used to prevent the magnetic circuit passing through the first rotor lamination from leaking outward; the second spacer is used to prevent the magnetic circuit passing through the second rotor lamination from leaking outward.

[0011] Optionally, the motor rotor includes a first permanent magnet, which is sleeved on the first body segment, and along the axial direction of the rotating shaft, two ends of the first permanent magnet are in contact with the first spacer and the second spacer respectively.

[0012] Optionally, the motor rotor further comprises a sheath, which is sleeved on the outer peripheral surface of the first permanent magnet. The sheath is used to protect the first permanent magnet from damage caused by external force.

[0013] Optionally, along the axial direction of the rotating shaft, two ends of the sheath are in contact with the first spacer and the second spacer respectively. The first spacer and the second spacer sandwich the sheath in the middle, play a positioning role for the sheath, and prevent the sheath from axial movement.

[0014] Optionally, the sleeve has a second hole that matches the first permanent magnet, and the second hole is interference-fitted with the first permanent magnet. The sleeve is pressed against the outer circumferential surface of the first permanent magnet by interference fit, and the sleeve can protect the first permanent magnet and reduce the contact probability between external parts and the first permanent magnet. At the same time, when the shaft rotates at high speed, the sleeve can reduce the damage to the first permanent magnet caused by centrifugal force.

[0015] In a second aspect, an embodiment of the present application provides a magnetic levitation motor, comprising a rotating shaft assembly as described in any of the above embodiments. The clamping ring is positioned by surface-to-surface interference fit between the inner circular surface of the first clamping section and the outer circular surface of the first body section, which can alleviate the phenomenon of tilting of the clamping ring during installation, and can make the center of the clamping ring coincide with the rotating shaft, that is, the clamping ring and the rotating shaft are coaxial, so that the rotating shaft assembly can have good dynamic balance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic cross-sectional structure diagram of a rotating shaft assembly used in a magnetic levitation motor in the present application;

[0018] Figure 2 This is a schematic structural diagram of a rotating shaft assembly used in a magnetic levitation motor in the present application;

[0019] Figure 3 This is a schematic diagram of the structure of the clamping ring of this application;

[0020] Figure 4 This is an enlarged view of the structure of area A in the figure.

[0021] [Description of Reference Numerals]

[0022] 1: rotating shaft; 11: first body section; 12: second body section; 2: first rotor lamination; 3: motor rotor; 31: first permanent magnet; 32: sleeve; 4: second rotor lamination; 5: clamping ring; 51: first clamping section; 52: second clamping section; 53: first hole; 61: first spacer; 62: second spacer; 63: detection ring. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0024] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0025] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0028] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0029] The positioning of each component on the shaft assembly relies on the thread on the inner circumference of the threaded ring and the thread on the outer circumference of the shaft to be assembled together. However, the thread matching causes a gap between the shaft and the threaded ring in the radial direction. The threaded ring is prone to deflection, resulting in uneven quality of the shaft assembly in the circumferential direction, which in turn affects the performance of the magnetic levitation motor. Therefore, it is necessary to improve the shaft assembly to overcome the uneven quality of the shaft assembly in the circumferential direction. In addition, in order to improve the assembly efficiency between the threaded ring and the shaft, it is necessary to improve the outer surface of the threaded ring to simplify the transfer steps and improve the assembly efficiency.

[0030] In addition, the outer cylindrical surface of the threaded ring cooperates with the radial sensor to detect the rotor distance, which requires the outer cylindrical surface of the rotor threaded ring to be smooth and undamaged; the current outer cylindrical surface of the threaded ring is not easy to tighten, and the outer cylindrical detection surface is easily damaged during the tightening process. Therefore, a method is needed that can control the torque to tighten the threaded ring on the rotating shaft and has a smooth detection surface that meets the detection requirements.

[0031] First, refer to Figures 1 to 4 The embodiment of the present application provides a shaft assembly for a magnetic levitation motor, comprising a shaft 1, a first rotor laminate 2, a motor rotor 3, a second rotor laminate 4 and a clamping ring 5. Along the axial direction of the shaft 1, the shaft 1 comprises a first body section 11 and a second body section 12, and the outer diameter of the first body section 11 is greater than that of the second body section 12; along the axial direction of the shaft 1, the first rotor laminate 2, the motor rotor 3 and the second rotor laminate 4 are sequentially sleeved on the first body section 11; along the axial direction of the shaft 1, the clamping ring 5 comprises a first clamping section 51 and a second clamping section 52 connected in sequence, at least part of the inner circumference of the first clamping section 51 contacts the outer circumference of the first body section 11, and the inner circumference of the second clamping section 52 is threadedly matched with the outer circumference of the second body section 12.

[0032] The shaft assembly for the magnetic levitation motor proposed in the embodiment of the present application is divided into two sections with different outer diameters, namely, the first body section 11 and the second body section 12, and the clamping ring 5 is divided into the first clamping section 51 and the second clamping section 52. The first clamping section 51 is at least partially sleeved on the first body section 11, and the inner circumference of the first clamping section 51 contacts the outer circumference of the first body section 11, and the inner circumference of the second clamping section 52 is threadedly matched with the outer circumference of the second body section 12. The inner circumference of the first clamping section 51 contacts the outer circumference of the first body section 11, so that the radial positioning of the clamping ring 5 is achieved, so that the axis of the clamping ring 5 coincides with the axis of the shaft 1, which alleviates the phenomenon of the clamping ring 5 being tilted during assembly, and reduces the phenomenon of the clamping ring being deflected due to the thread gap between the clamping ring 5 and the shaft 1, thereby ensuring that the shaft assembly has good dynamic balance.

[0033] Optionally, refer to Figure 3 and Figure 4 The first clamping section 51 has a first hole 53 that matches the first body section 11, and the first hole 53 is interference-fitted with the first body section 11. The clamping ring 5 is sleeved on the first body section 11 through the first hole 53 and is interference-fitted with the first body section 11, which alleviates the phenomenon that the clamping ring 5 and the rotating shaft 1 cannot be accurately positioned due to the gap. The first clamping section 51 of the clamping ring 5 is interference-fitted with the first body section 11 to achieve the purpose of tightening, realize the positioning of the clamping ring 5 in the radial direction, and ensure that the clamping ring can be firmly installed in the first body section 11.

[0034] Optionally, along the axial direction of the rotating shaft 1, the projection of the outer peripheral surface of the second clamping section 52 is non-circular. In the process of installing the clamping ring 5 to the rotating shaft 1, the clamping ring 5 needs to be tightened, because the circular surface is very easy to slip during the tightening process. The second clamping section 52 is designed to be non-circular, which is convenient for using a torque wrench to determine the tightening torque, improves work efficiency, and reduces the slippage phenomenon that occurs during the tightening process of the second clamping section 52.

[0035] Since the second clamping section 52 is farther away from the first body section 11 than the first clamping section 51 , the projection of the second clamping section 52 along the axial direction of the rotating shaft 1 can be constructed to be non-circular, so as to facilitate workers to tighten the clamping ring 5 .

[0036] Optionally, along the axial direction of the rotating shaft 1, the projection of the outer circumference of the second pressing section 52 is a polygon. In other words, the outer circumference of the second pressing section 52 is configured as a polygon. It should be understood that the projection of the outer circumference of the second pressing section 52 can be a polygon, such as a quadrilateral, a pentagon, a hexagon, etc. In an optional embodiment, the outer circumference of the second pressing section 52 is a regular polygon.

[0037] In an optional embodiment, the outer circumference of the second clamping section 52 is projected as a regular hexagon, that is, the outer circumference of the second clamping section 52 is configured as a regular hexagon. In an optional embodiment, the outer circumference of the second clamping section 52 near the end of the shaft 1 is configured as a regular hexagon, and the clamping ring 5 can be tightened on the shaft 1 according to a specified torque by a torque wrench.

[0038] Optionally, along the axial direction of the rotating shaft 1 , the projection of the outer circumference of the first pressing section 51 is circular. The first pressing section 51 with a circular outer circumference can be used as a detection surface for detecting the radial offset of the rotating shaft 1 .

[0039] In an optional embodiment, the projection of the outer circumference of the first clamping section 51 of the clamping ring 5 is circular, and the projection of the outer circumference of the second clamping section 52 of the clamping ring 5 is polygonal. The processing accuracy of the arc-shaped outer circumference of the first clamping section 51 meets the detection requirements of the radial sensor, so the arc-shaped outer circumference of the first clamping section 51 can be used as a detection surface, and the arc-shaped outer circumference of the first clamping section 51 is set corresponding to the radial sensor to detect the radial offset of the rotating shaft 1. The outer surface of the second clamping section 52 near the end of the rotating shaft adopts a polygonal structure such as a hexagon, which can be easily tightened according to the specified torque by a torque wrench. The outer surface of the second clamping section 52 is provided with a polygonal shape, which solves the problem that the circular clamping ring 5 is very easy to slip during the tightening process and the tightening torque cannot be accurately measured. In order to ensure the surface roughness of the clamping ring 5 in the related technology, the clamping ring 5 needs to be processed and surface treated after the assembly of the clamping ring 5. The smooth outer cylindrical surface after processing and surface treatment can be used as a detection surface, and the secondary processing leads to low work efficiency. In the present application, each component can be directly processed into place before assembly. During the process of tightening the clamping ring 5 and the rotating shaft 1 by using a torque wrench, the arc-shaped outer surface of the first clamping section 51 of the clamping ring 5 is not destroyed or damaged. After assembly with the rotating shaft 1, there is no need to perform secondary processing such as turning or grinding on the arc-shaped outer surface of the first clamping section 51, which reduces the processing steps, improves work efficiency, and reduces processing costs.

[0040] The processing accuracy of the arc-shaped outer peripheral surface of the first clamping section 51 of the clamping ring 5 meets the requirements of the detection surface, so that the radial sensor of the magnetic levitation motor can obtain the radial offset of the rotating shaft 1 by detecting the offset distance of the detection ring, thereby realizing the adjustment of the radial position of the rotating shaft 1 by the radial magnetic bearing.

[0041] Optionally, refer to Figure 1 and Figure 2, the shaft assembly also includes a first spacer 61 and a second spacer 62, the first spacer 61 is arranged between the first rotor lamination 2 and the motor rotor 3, and the second spacer 62 is arranged between the second rotor lamination 4 and the motor rotor 3; wherein, along the axial direction of the shaft 1, the clamping ring 5 is suitable for clamping the second rotor lamination 4, the second spacer 62 and the motor rotor 3. Optionally, the first spacer 61 and the second spacer 62 are non-magnetic conductive parts, such as stainless steel. The magnetic levitation motor has a first radial magnetic bearing and a second radial magnetic bearing, the first rotor lamination 2 is arranged correspondingly to the first radial magnetic bearing, and the second rotor lamination 4 is arranged correspondingly to the second radial magnetic bearing. The first spacer 61 is arranged between the first rotor lamination 2 and the electronic rotor. When the first radial magnetic bearing is energized, a magnetic circuit is generated between the first radial magnetic bearing and the first rotor lamination 2. The first spacer 61 prevents the magnetic circuit passing through the first rotor lamination 2 from leaking outward, thereby improving the efficiency of the radial first magnetic bearing. The second spacer 62 is arranged between the second rotor lamination 4 and the motor rotor 3. When the second radial magnetic bearing is energized, a magnetic circuit is generated between the second radial magnetic bearing and the second rotor lamination 4. The second spacer 62 prevents the magnetic circuit passing through the second rotor lamination 4 from leaking outward, thereby improving the working efficiency of the second radial magnetic bearing.

[0042] Optionally, refer to Figure 1 The motor rotor 3 includes a first permanent magnet 31, which is sleeved on the first body section 11, and along the axial direction of the rotating shaft 1, two ends of the first permanent magnet 31 are in contact with the first spacer 61 and the second spacer 62 respectively.

[0043] Optionally, refer to Figure 1 The motor rotor 3 further includes a sheath 32, which is sleeved on the outer peripheral surface of the first permanent magnet 31. The sheath 32 is used to protect the first permanent magnet 31 and reduce the damage to the first permanent magnet 31 caused by external forces such as centrifugal force.

[0044] Optionally, along the axial direction of the rotating shaft 1, both ends of the sheath 32 are respectively in contact with the first spacer 61 and the second spacer 62. The first spacer 61 and the second spacer 62 sandwich the sheath 32, positioning the sheath 32 and preventing the sheath 32 from axial movement.

[0045] Optionally, the sleeve 32 has a second hole that matches the first permanent magnet 31, and the second hole is interference-fitted with the first permanent magnet 31. The sleeve 32 is pressed against the outer circumferential surface of the first permanent magnet 31 by interference fit, and the sleeve 32 can protect the first permanent magnet 31 and reduce the contact probability between external parts and the first permanent magnet 31. At the same time, when the shaft 1 rotates at high speed, the sleeve 32 can reduce the damage to the first permanent magnet 31 caused by the centrifugal force.

[0046] In the second aspect, the embodiment of the present application provides a magnetic levitation motor, including the shaft assembly described in any of the above embodiments. Wherein, the shaft assembly includes a detection ring 63, a first rotor lamination 2, a first spacer 61, a first permanent magnet 31, a second spacer 62, a second rotor lamination 4 and a clamping ring 5, which are sequentially arranged on the shaft 1. The clamping ring 5 is positioned by the inner circular surface of the first clamping section 51 and the outer circular surface of the first body section 11 through surface-to-surface contact interference fit, which can alleviate the phenomenon of the clamping ring 5 tilting during the installation process, and can make the clamping ring 5 coincide with the center of the shaft 1, that is, the clamping ring 5 is coaxial with the shaft 1, so that the shaft assembly has good dynamic balance. In addition, the second clamping section 52 of the clamping ring 5 is threadedly matched with the outer peripheral surface of the second body section 12 near the end of the shaft 1, and the projection shape of the second clamping section 52 is a hexagon or other polygon, which is convenient for using a torque wrench to determine the tightening torque and improve work efficiency. The inner circumference of the first clamping section 51 is in interference fit with the outer circumference of the first body section 11 of the rotating shaft 1, which alleviates the assembly tilt and the deflection of the clamping ring 5 caused by the thread gap between the clamping ring 5 and the rotating shaft 1. At the same time, the processing accuracy of the arc-shaped outer circumference of the first clamping section 51 meets the detection requirements of the radial sensor, so the arc-shaped outer circumference of the first clamping section 51 can be used as a detection surface, and the arc-shaped outer circumference of the first clamping section 51 is set corresponding to the radial sensor, which can be used to detect the radial offset of the rotating shaft 1.

[0047] Among them, the detection ring 63 is a non-magnetic member, such as stainless steel. The detection ring 63 is set corresponding to the radial sensor. The radial sensor obtains the radial offset of the rotating shaft by detecting the radial offset of the detection ring 63 set on the rotating shaft, so as to adjust the position of the rotating shaft through the magnetic bearing. In one embodiment, the detection ring 63 is set corresponding to the first radial bearing and the first radial sensor, and the outer surface of the detection ring 63 is set corresponding to the first radial sensor; the clamping ring 5 is set corresponding to the second radial magnetic bearing and the second radial sensor, and the arc-shaped outer peripheral surface of the first clamping section 51 of the clamping ring 5 is set corresponding to the second radial sensor. The arc-shaped outer peripheral surface of the first clamping section 51 and the outer surface of the detection ring 63 are both smooth and free of bumps and scratches. When the rotating shaft deviates, the detection ring 63 and the first clamping section 51 are driven to deviate, the first radial sensor detects the change in the spacing between the detection ring 63 and the detection ring 63, and the second radial sensor detects the change in the spacing between the clamping ring 5. The controller adjusts the parameters of the first radial magnetic bearing coil and the second radial magnetic bearing coil according to the detection data of the first radial sensor and the second radial sensor to adjust the position of the rotating shaft.

[0048] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0049] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0050] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

[0051] Although the embodiments of the present application have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A shaft assembly for a magnetic levitation motor, characterized in that: include: A rotating shaft, wherein along the axial direction of the rotating shaft, the rotating shaft comprises a first body section and a second body section, and the outer diameter of the first body section is greater than that of the second body section; A first rotor lamination, a motor rotor and a second rotor lamination, wherein the first rotor lamination, the motor rotor and the second rotor lamination are sequentially sleeved on the first body section along the axial direction of the rotating shaft; A clamping ring, along the axial direction of the rotating shaft, includes a first clamping section and a second clamping section connected in sequence, at least a portion of the inner circumference of the first clamping section contacts the outer circumference of the first body section, and the inner circumference of the second clamping section is threadedly matched with the outer circumference of the second body section.

2. The rotating shaft assembly for a magnetic levitation motor according to claim 1, characterized in that: The first pressing section has a first hole matched with the first body section, and the first hole is interference-fitted with the first body section.

3. The shaft assembly for a magnetic levitation motor according to claim 1, characterized in that: Along the axial direction of the rotating shaft, the projection of the outer peripheral surface of the second pressing section is a polygon.

4. The shaft assembly for a magnetic levitation motor according to claim 1, characterized in that: Along the axial direction of the rotating shaft, the projection of the outer circumferential surface of the first pressing section is circular.

5. The shaft assembly for a magnetic levitation motor according to claim 1, characterized in that: The shaft assembly further includes a first spacer and a second spacer, wherein the first spacer is disposed between the first rotor lamination and the motor rotor, and the second spacer is disposed between the second rotor lamination and the motor rotor; Wherein, along the axial direction of the rotating shaft, the clamping ring is suitable for clamping the second rotor lamination, the second spacer and the motor rotor.

6. The rotating shaft assembly for a magnetic levitation motor according to claim 5, characterized in that: The motor rotor comprises a first permanent magnet, which is sleeved on the first body section, and along the axial direction of the rotating shaft, two ends of the first permanent magnet are in contact with the first spacer and the second spacer respectively.

7. The shaft assembly for a magnetic levitation motor according to claim 6, characterized in that: The motor rotor further includes a sheath, which is sleeved on the outer peripheral surface of the first permanent magnet.

8. The rotating shaft assembly for a magnetic levitation motor according to claim 7, characterized in that: Along the axial direction of the rotating shaft, two ends of the sheath are in contact with the first spacer and the second spacer respectively.

9. The shaft assembly for a magnetic levitation motor according to claim 8, characterized in that: The sleeve has a second hole matched with the first permanent magnet, and the second hole is interference-fitted with the first permanent magnet.

10. A magnetic levitation motor, characterized in that: The invention comprises the rotating shaft assembly according to any one of claims 1 to 9.

Images