Rotor assembly, motor and equipment

Abstract

The utility model provides a rotor assembly, a motor and equipment. The rotor assembly comprises a front rotating shaft, a magnet assembly and a rear rotating shaft which are sequentially arranged along the axial direction of the rotor assembly. The rotor assembly further comprises a center rod, a locking piece and a thrust plate. The rotor assembly is provided with a rotor center hole in the axial direction, and the rotor center hole penetrates through the front rotating shaft, the magnet assembly and the rear rotating shaft. The center rod comprises a rod part and a head part which are connected and coaxially arranged, the rod part is arranged in the rotor center hole in a penetrating mode, the head part is located in the rotor center hole and is in limiting fit with the rear rotating shaft in the axial direction, and the locking piece and the thrust plate are detachably arranged at the end, away from the head part, of the rod part; the locking piece, the thrust plate and the head part are matched in the axial direction to lock the front rotating shaft, the magnet assembly and the rear rotating shaft; at least one part of the front rotating shaft and at least one part of the rear rotating shaft are in interference fit with the center rod. According to the rotor, the bearing rotor can be replaced, the rejection rate of the whole shaft is reduced, and meanwhile the requirement for the coaxiality of repeated assembly of a multi-section detachable structure is met.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and specifically, to a rotor assembly, a motor and a device. Background Art

[0002] There is a conventional rotor which includes a front rotating shaft, a permanent magnet and a rear rotating shaft that are coaxially arranged and rotate synchronously. The permanent magnet is located between the front rotating shaft and the rear rotating shaft. Foil air bearings are sleeved outside both the front rotating shaft and the rear rotating shaft. A centrifugal impeller is installed at the front end of the front rotating shaft, and a cooling fan is installed at the rear end of the rear rotating shaft. That is, the front rotating shaft, the permanent magnet and the rear rotating shaft are connected together to form a rotating shaft. Although this kind of hollow rotor structure can reduce the overall weight of the rotor, the front rotating shaft magnetic steel is of a hollow structure, resulting in an increase in the magnetic reluctance of the motor magnetic field and a decrease in magnetic flux, affecting the performance of the motor. Moreover, the part where the foil bearings are sleeved is a non-detachable structure. Once the front and rear bearing rotors are worn and need to be replaced, the entire shaft has to be scrapped, causing great waste. Summary of the Utility Model

[0003] The first object of the utility model is to provide a rotor assembly which can realize the replaceability of the bearing rotor, reduce the scrap rate of the whole shaft, and at the same time ensure the coaxiality requirements of repeated assembly of the multi-section detachable structure, ensure the repeated consistency of the dynamic balance accuracy of repeated disassembly and assembly, and reduce the fluctuation of the dynamic balance unbalance amount after replacing parts.

[0004] The second object of the utility model is to provide a motor adopting the above rotor assembly.

[0005] The third object of the utility model is to provide a device adopting the above motor.

[0006] To achieve the above first object, the utility model provides a rotor assembly, which includes a front rotating shaft, a magnet assembly and a rear rotating shaft arranged in sequence along the axial direction of the rotor assembly; the rotor assembly further includes a center rod, a locking member and a thrust disc; the rotor assembly is provided with a rotor center hole along the axial direction, and the rotor center hole penetrates through the front rotating shaft, the magnet assembly and the rear rotating shaft; the center rod includes a rod portion and a head portion which are connected and coaxially arranged, the rod portion is inserted into the rotor center hole, and the head portion is located in the rotor center hole and is axially limited and matched with the rear rotating shaft. The locking member and the thrust disc are detachably arranged at one end of the rod portion far from the head portion, and the locking member, the thrust disc and the head portion are axially matched to lock the front rotating shaft, the magnet assembly and the rear rotating shaft; at least a part of the front rotating shaft and at least a part of the rear rotating shaft are in interference fit with the center rod.

[0007] As can be seen from the above solution, by setting the front rotating shaft, the magnet assembly, and the rear rotating shaft into a multi-segment structure and connecting each component in series through the central rod, the entire shaft can be disassembled and assembled repeatedly, enabling each component of the rotor assembly to be independently replaced, reducing the scrap rate of the entire shaft, and avoiding the common problems of existing detachable rotating shafts, namely, the poor coaxiality and dynamic balance consistency after repeated disassembly and assembly of the entire shaft. At the same time, the fluctuation of the dynamic balance unbalance amount after replacing components is reduced. Meanwhile, the front and rear rotating shafts can be hollowed out, which can also reduce the mass of the entire shaft, improve the stiffness of the entire shaft, and improve the stability of system operation. In addition, the central rod at the center of the magnet assembly is a solid magnetic conduction rod, and there is no problem of increased magnetic resistance of the motor magnetic field and decreased magnetic flux.

[0008] A preferred solution is that the magnet assembly includes a protective sleeve, a magnet, and a retaining ring. The protective sleeve is cylindrical, and one end of the protective sleeve has an opening. The magnet is arranged inside the protective sleeve, and the retaining ring is arranged at the opening and closes the opening.

[0009] Thus, by setting the protective sleeve and the retaining ring to wrap the magnet, the magnetic leakage on the surface of the rotor assembly can be reduced, and the performance of the motor can be improved.

[0010] A further solution is that the end of the protective sleeve far from the opening is in interference fit with the rod portion, and both the magnet and the retaining ring are in clearance fit with the rod portion.

[0011] A further solution is that the materials of the protective sleeve, the retaining ring, the front rotating shaft, and the rear rotating shaft are all non-magnetic materials; and / or the material of the central rod is a magnetic conduction material; and / or the magnet is in interference fit with the protective sleeve; and / or the retaining ring and the end wall of the protective sleeve far from the opening can axially cooperate to compress the magnet.

[0012] Thus, the front rotating shaft and the rear rotating shaft are made of non-magnetic materials, which can reduce the magnetic leakage on the surface of the rotor and improve the performance of the motor. In addition, the retaining ring compresses the magnet, which can prevent the magnet from shaking relative to the protective sleeve and affecting the performance of the motor.

[0013] A preferred solution is that the retaining ring is located inside the protective sleeve, and the side surface of the retaining ring far from the magnet is coplanar with the end surface of the protective sleeve close to the opening.

[0014] Thus, it is ensured that the magnet assembly and the rear rotating shaft can be compressed, thereby ensuring the overall stability of the rotor assembly.

[0015] A preferred solution is that the thrust disc includes a mating portion and a radially extending portion. The radially extending portion extends radially outward from the outer peripheral wall of the mating portion along the radial direction of the thrust disc; the radially extending portion axially compresses the end surface of the front rotating shaft; the mating portion extends into the front rotating shaft and is in interference fit with the front rotating shaft, and the central rod axially passes through the mating portion and is fixedly connected to the locking member.

[0016] It can be seen that the thrust disk supports the rod part at one end of the rod part far from the head part, and at the same time, together with the locking part, locks the rod part, ensuring the stability of the motor operation.

[0017] A further solution is that a disassembly hole is provided on the radially extending part. The disassembly hole axially penetrates the radially extending part, and the inner peripheral wall of the disassembly hole is provided with threads. The disassembly hole is arranged opposite to the end face of the front rotating shaft.

[0018] It can be seen that the purpose of setting the disassembly hole is to disassemble the thrust disk. When it is necessary to disassemble the rotor assembly, the disassembly tooling screw is screwed into the disassembly hole until the tooling screw contacts the end face of the front rotating shaft. Continuing to tighten the tooling screw, the end face of the front rotating shaft will apply a thrust to the thrust disk through the tooling screw. The direction of the thrust is along the axis away from the front rotating shaft, so that the thrust disk is separated from the front rotating shaft, realizing the disassembly of the thrust disk.

[0019] A further solution is that the number of disassembly holes is more than two, and multiple disassembly holes are arranged along the circumferential direction of the radially extending part.

[0020] It can be seen that the setting of multiple disassembly holes, on the one hand, facilitates the disassembly of the rotor assembly, and on the other hand, can achieve the effect of weight reduction, reduce the mass of the whole shaft, and improve the operation stability.

[0021] A preferred solution is that the thrust disk is in clearance fit with the rod part. A threaded connection part is provided at one end of the rod part far from the head part. The locking part is threadedly connected to the threaded connection part and axially presses the thrust disk.

[0022] A preferred solution is that the rod part of the central rod includes a rear shaft fitting section, a magnet fitting section, and a first front shaft fitting section that are coaxial and sequentially connected along the axis; the rear shaft fitting section is connected to the head part, and the diameters of the head part, the rear shaft fitting section, the magnet fitting section, and the first front shaft fitting section gradually decrease; the rotor central hole includes a first rear shaft hole section, a second rear shaft hole section, a magnet hole section, and a first front shaft hole section that are coaxial and sequentially connected along the axis; the first rear shaft hole section and the second rear shaft hole section are both located in the rear rotating shaft, the magnet hole section is located in the magnet assembly, and the first front shaft hole section is located in the front rotating shaft; the head part is in clearance fit with the first rear shaft hole section, the rear shaft fitting section is in interference fit with the second rear shaft hole section, and the first front shaft fitting section is in interference fit with the first front shaft hole section.

[0023] A further solution is that the length of the first rear shaft hole section is greater than the length of the head part. And / or a disassembly part is provided at one end of the head part far from the rod part.

[0024] It can be seen that while ensuring the overall connection stability of the rotor assembly, the rear rotating shaft forms a hollow structure, thereby reducing the mass of the whole shaft, improving the stiffness of the whole shaft, and improving the operation stability of the system. The setting of the disassembly part facilitates the disassembly of the central rod.

[0025] A further solution is that the central hole of the rotor further includes a second front shaft hole section, which is located inside the front rotating shaft. The second front shaft hole section is coaxial with the first front shaft hole section and is connected to one end of the first front shaft hole section far from the magnet hole section; the rod part further includes a second front shaft fitting section, which is connected to one end of the first front shaft fitting section far from the magnet fitting section and is arranged coaxially with the first front shaft fitting section; the second front shaft fitting section is located in the second front shaft hole section.

[0026] A further solution is that the inner diameter of the second front shaft hole section is larger than that of the first front shaft hole section; and / or the diameter of the second front shaft fitting section is smaller than that of the first front shaft fitting section.

[0027] Thus, the front rotating shaft forms a hollow structure to further reduce the mass of the whole shaft.

[0028] To achieve the above second object, the present utility model provides a motor, including the above rotor assembly.

[0029] To achieve the above third object, the present utility model provides a device, including the above motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a cross-sectional view of an embodiment of the rotor assembly of the present utility model.

[0031] Figure 2 It is a cross-sectional view of the magnet assembly in the embodiment of the rotor assembly of the present utility model.

[0032] Figure 3 It is a cross-sectional view of the protective sleeve in the embodiment of the rotor assembly of the present utility model.

[0033] Figure 4 It is a cross-sectional view of the snap ring in the embodiment of the rotor assembly of the present utility model.

[0034] Figure 5 It is a cross-sectional view of the thrust plate in the embodiment of the rotor assembly of the present utility model.

[0035] Figure 6 It is a structural diagram of the thrust plate from the first perspective in the embodiment of the rotor assembly of the present utility model.

[0036] Figure 7 It is a structural diagram of the thrust plate from the second perspective in the embodiment of the rotor assembly of the present utility model.

[0037] Figure 8 It is a cross-sectional view of the front rotating shaft in the embodiment of the rotor assembly of the present utility model.

[0038] Figure 9 It is a cross-sectional view of the rear rotating shaft in the embodiment of the rotor assembly of the present utility model.

[0039] Figure 10 This is a structural diagram of the central rod in an embodiment of the rotor assembly of the present utility model.

[0040] The following further describes the present utility model in conjunction with the accompanying drawings and embodiments. Specific embodiments

[0041] Now, various exemplary embodiments of the present utility model will be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and in no way limits the present utility model and its application or use. The present utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present utility model thorough and complete, and to fully convey the scope of the present utility model to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the components of materials, numerical expressions, and numerical values set forth in these embodiments should be construed as merely exemplary and not as limitations.

[0042] The "first", "second", and similar terms used in the present utility model do not denote any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as "including" or "comprising" mean that the elements before the term cover the elements listed after the term, and do not exclude the possibility of also covering other elements. "Up", "down", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0043] In the present utility model, when it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices and have an intermediate device.

[0044] All terms used in the present utility model (including technical terms or scientific terms) have the same meaning as understood by those of ordinary skill in the relevant art, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, for example, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such here.

[0045] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and devices should be regarded as part of the specification.

[0046] The device in this embodiment is a centrifugal compressor, which includes a motor. And the motor is an ultra-high speed motor. In other embodiments, the device can also be other devices using this ultra-high speed motor.

[0047] See Figure 1 , in this embodiment, the motor includes a rotor assembly. The rotor assembly includes a front rotating shaft 1, a magnet assembly 2, and a rear rotating shaft 3 arranged in sequence along the axial direction of the rotor assembly. In addition, the rotor assembly further includes a center rod 4, a locking member 51, and a thrust disc 52.

[0048] The rotor assembly is axially provided with a rotor center hole 6, and the rotor center hole 6 penetrates through the front rotating shaft 1, the magnet assembly 2, and the rear rotating shaft 3. The center rod 4 includes a rod portion 40 and a head portion 41 that are connected and coaxially arranged. The rod portion 40 is inserted into the rotor center hole 6, and the head portion 41 is located in the rotor center hole 6 and is axially limited and cooperated with the rear rotating shaft 3. The locking member 51 and the thrust disc 52 are detachably arranged at one end of the rod portion 40 away from the head portion 41, and the locking member 51, the thrust disc 52, and the head portion 41 are axially cooperated to lock the front rotating shaft 1, the magnet assembly 2, and the rear rotating shaft 3.

[0049] See Figures 1 to 4 , the magnet assembly 2 includes a protective sleeve 21, a magnet 22, and a retaining ring 23. The protective sleeve 21 is cylindrical, and one end of the protective sleeve 21 has an opening 211. The magnet 22 is arranged in the protective sleeve 21, and the retaining ring 23 is arranged at the opening 211 to close the opening 211. The magnet 22 is in interference fit with the protective sleeve 21, and the retaining ring 23 and the end wall 212 of the protective sleeve 21 away from the opening 211 can be axially cooperated to press the magnet 22. The retaining ring 23 is located in the protective sleeve 21, and the side surface 231 of the retaining ring 23 away from the magnet 22 is coplanar with the end face 213 of the protective sleeve 21 close to the opening 211. The materials of the protective sleeve 21, the retaining ring 23, the front rotating shaft 1, and the rear rotating shaft 3 are all non-magnetic materials, and the material of the center rod 4 is a magnetic material.

[0050] By providing the protective sleeve 21 and the retaining ring 23 to wrap the magnet 22, and the protective sleeve 21, the retaining ring 23, the front rotating shaft 1, and the rear rotating shaft 3 are all made of non-magnetic materials, the magnetic leakage on the surface of the rotor assembly can be reduced, and the performance of the motor can be improved. In addition, the retaining ring 23 presses the magnet 22, which can prevent the magnet 22 from shaking relative to the protective sleeve 21 and affecting the performance of the motor.

[0051] See Figure 1 And Figures 5 to 7, the thrust disk 52 includes a mating portion 521 and a radially extending portion 522. The radially extending portion 522 extends radially outward from the outer peripheral wall of the mating portion 521 along the radial direction of the thrust disk 52. The radially extending portion 522 presses against the end face 11 of the front rotating shaft 1 axially. The mating portion 521 extends into the front rotating shaft 1 and is in a small interference fit with the front rotating shaft 1. The thrust disk 52 and the front rotating shaft 1 form a front rotating shaft assembly. The center rod 4 passes through the mating portion 521 axially and is fixedly connected to the locking member 51.

[0052] The centrifugal compressor further includes a thrust bearing assembly (not shown). The thrust bearing assembly includes a front axial bearing and a rear axial bearing. The front axial bearing, the thrust disk 52, and the rear axial bearing are arranged axially in sequence, and there is no contact between adjacent two. During the operation of the rotor assembly, the front axial bearing and the rear axial bearing apply gas pressure or electromagnetic force to the thrust disk 52 to ensure the relative stability of the axial position of the rotor assembly and prevent the rotor assembly from axially moving.

[0053] The radially extending portion 522 is provided with a disassembly hole 523. The disassembly hole 523 axially penetrates the radially extending portion 522. The inner peripheral wall of the disassembly hole 523 is provided with threads. The disassembly hole 523 is disposed opposite to the end face 11 of the front rotating shaft 1. The number of the disassembly holes 523 is more than two. In this embodiment, the number of the disassembly holes 523 is multiple, and the multiple disassembly holes 523 are evenly arranged along the circumferential direction of the radially extending portion 522.

[0054] The purpose of setting the disassembly hole 523 is for disassembling the thrust disk 52. When it is necessary to disassemble the rotor assembly, the disassembly tooling screw is screwed into the disassembly hole 523 until the tooling screw contacts the end face 11 of the front rotating shaft 1. Continuing to tighten the tooling screw, the end face 11 of the front rotating shaft 1 will apply a thrust to the thrust disk 52 through the tooling screw. The direction of the thrust is axially away from the front rotating shaft 1, so that the thrust disk 52 is separated from the front rotating shaft 1, realizing the disassembly of the thrust disk 52. At the same time, the setting of multiple disassembly holes 523 can also achieve the effect of weight reduction, reduce the mass of the whole shaft, and improve the operation stability.

[0055] A boss portion 524 is provided on the side of the radially extending portion 522 away from the mating portion 521. The boss portion 524 protrudes outward from the side wall of the radially extending portion 522. Each disassembly hole 523 is located on the boss portion 524.

[0056] See Figure 1 And Figures 8 to 10 , the rod portion 40 of the center rod 4 includes a rear shaft mating section 42, a magnet mating section 43, a first front shaft mating section 44, and a second front shaft mating section 45 that are coaxial and axially connected in sequence. The rear shaft mating section 42 is connected to the head 41. The diameters of the head 41, the rear shaft mating section 42, the magnet mating section 43, the first front shaft mating section 44, and the second front shaft mating section 45 gradually decrease.

[0057] The rotor center hole 6 includes a first rear shaft hole section 61, a second rear shaft hole section 62, a magnet hole section 63, a first front shaft hole section 64, and a second front shaft hole section 65 that are coaxial and sequentially connected along the axial direction. Both the first rear shaft hole section 61 and the second rear shaft hole section 62 are located within the rear rotating shaft 3, the magnet hole section 63 is located within the magnet assembly 2, both the first front shaft hole section 64 and the second front shaft hole section 65 are located within the front rotating shaft 1. The head 41 has a clearance fit with the first rear shaft hole section 61, and the length of the first rear shaft hole section 61 is greater than the length of the head 41. A disassembly portion 411 is provided at one end of the head 41 away from the rod portion, and the disassembly portion 411 is a threaded hole. The rear shaft mating section 42 has a small interference fit with the second rear shaft hole section 62, the first front shaft mating section 44 has a small interference fit with the first front shaft hole section 64, the second front shaft mating section 45 is located within the second front shaft hole section 65, and the inner diameter of the second front shaft hole section 65 is greater than the inner diameter of the first front shaft hole section 64. At the same time, since the diameter of the second front shaft mating section 45 is smaller than the diameter of the first front shaft mating section 44, a hollow structure is formed between the second front shaft hole section 65 and the second front shaft mating section 45 to facilitate reducing the weight of the entire shaft. One end of the protective sleeve 21 away from the opening 211 has a small interference fit with the magnet mating section 43 of the rod portion 40. Both the magnetic steel 22 and the retaining ring 23 have a clearance fit with the magnet mating section 43.

[0058] The second front shaft mating section 45 is provided with a threaded connection portion 451. The locking member 51 is threadedly connected to the threaded connection portion 451 and axially presses the thrust disk 52. The central hole of the thrust disk 52 has a clearance fit with the second front shaft mating section 45.

[0059] When some components of the rotor assembly need to be replaced, the center rod 4 can be fixed through the disassembly hole 411 by using the pull rod structure. After removing the nut serving as the locking member 51 and then pulling it outwards, the entire shaft can be disassembled for component replacement. At the same time, the disassembly tooling screw can be screwed into the disassembly hole 523 to disassemble the thrust disk 52 from the front rotating shaft 1.

[0060] As can be seen from the above, by setting the front rotating shaft, the magnet assembly, and the rear rotating shaft into a multi-segment structure and connecting each component in series through the central rod, the entire shaft can be disassembled and assembled repeatedly, enabling the independent replacement of each component of the rotor assembly, reducing the scrap rate of the entire shaft, and avoiding the common problems of existing detachable rotating shafts, namely, poor coaxiality and dynamic balance consistency after repeated disassembly and assembly of the entire shaft. At the same time, the fluctuation of the dynamic balance unbalance amount after replacing components is reduced. Meanwhile, the front and rear rotating shafts can be hollowed out. After hollowing out, the mass of the entire shaft can be reduced, the stiffness of the entire shaft can be increased, and the stability of the system operation can be improved. In addition, the central rod at the center of the magnet assembly is a solid magnetic conduction rod, and there is no problem of increased magnetic resistance and decreased magnetic flux in the motor magnetic field. In addition, through the interference fit between the rear shaft mating section and the second rear shaft hole section, and the interference fit between the first front shaft mating section and the first front shaft hole section, precise positioning of each component in the radial direction is achieved, ensuring the coaxiality of the entire rotor assembly shaft.

[0061] Finally, it should be emphasized that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A rotor assembly, comprising a front shaft, a magnet assembly and a rear shaft arranged in sequence along the axial direction of the rotor assembly; Features: The rotor assembly also includes a center rod, a locking member and a thrust plate; The rotor assembly is provided with a rotor center hole along the axial direction, and the rotor center hole passes through the front shaft, the magnet assembly and the rear shaft; The central rod comprises a rod portion and a head portion which are connected and arranged coaxially; The rod portion is inserted into the central hole of the rotor, the head portion is located in the central hole of the rotor and cooperates with the rear shaft in the axial upper limit position, the locking member and the thrust plate are both detachably arranged at an end of the rod portion away from the head portion, and the locking member, the thrust plate and the head portion cooperate in the axial direction to lock the front shaft, the magnet assembly and the rear shaft; At least a portion of the front rotating shaft and at least a portion of the rear rotating shaft are interference fit with the center rod.

2. The rotor assembly according to claim 1, characterized in that: The magnet assembly comprises a protective cover, a magnetic steel and a retaining ring. The protective cover is cylindrical and has an opening at one end. The magnetic steel is arranged in the protective cover. The retaining ring is arranged at the opening and closes the opening.

3. The rotor assembly according to claim 2, characterized in that: One end of the protective sleeve away from the opening is interference-fitted with the rod portion, and both the magnetic steel and the retaining ring are clearance-fitted with the rod portion.

4. The rotor assembly according to claim 2, characterized in that: The protective sleeve, the retaining ring, the front shaft and the rear shaft are all made of non-magnetic materials; and / or The material of the central rod is a magnetic conductive material; and / or The magnetic steel and the protective cover are interference fit; and / or The retaining ring and the end wall of the protective sleeve away from the opening can cooperate with each other in the axial direction to press the magnetic steel tightly.

5. The rotor assembly according to any one of claims 2 to 4, characterized in that: The retaining ring is located in the protective sleeve, and the side surface of the retaining ring away from the magnetic steel is coplanar with the end surface of the protective sleeve close to the opening.

6. The rotor assembly according to any one of claims 1 to 4, characterized in that: The thrust plate comprises a matching portion and a radially extending portion, wherein the radially extending portion extends outwardly from an outer peripheral wall of the matching portion along the radial direction of the thrust plate; The radially extending portion presses the end surface of the front shaft along the axial direction; The matching portion extends into the front shaft and is interference-fitted with the front shaft, and the center rod passes through the matching portion along the axial direction and is fixedly connected to the locking member.

7. The rotor assembly according to claim 6, characterized in that: The radial extension portion is provided with a disassembly hole, the disassembly hole penetrates the radial extension portion along the axial direction, the inner peripheral wall of the disassembly hole is provided with a thread, and the disassembly hole is arranged opposite to the end surface of the front rotating shaft.

8. The rotor assembly according to claim 7, characterized in that: The number of the disassembly holes is more than two, and the plurality of disassembly holes are arranged along the circumference of the radially extending portion.

9. The rotor assembly according to claim 6, characterized in that: The thrust plate is loosely matched with the rod portion, a threaded connection portion is provided at one end of the rod portion away from the head portion, and the locking member is threadedly connected to the threaded connection portion and presses the thrust plate along the axial direction.

10. The rotor assembly according to any one of claims 1 to 4, characterized in that: The rod portion of the central rod comprises a rear axle matching section, a magnet matching section and a first front axle matching section which are coaxial and sequentially connected along the axial direction; The rear axle fitting section is connected to the head, and the diameters of the head, the rear axle fitting section, the magnet fitting section and the first front axle fitting section gradually decrease; The rotor center hole comprises a first rear shaft hole section, a second rear shaft hole section, a magnet hole section, and a first front shaft hole section which are coaxial and sequentially connected along the axial direction; The first rear axle hole section and the second rear axle hole section are both located in the rear rotating shaft, the magnet hole section is located in the magnet assembly, and the first front axle hole section is located in the front rotating shaft; The head portion is clearance-fitted with the first rear axle hole segment, the rear axle fitting segment is interference-fitted with the second rear axle hole segment, and the first front axle fitting segment is interference-fitted with the first front axle hole segment.

11. The rotor assembly according to claim 10, characterized in that: The length of the first rear axle hole section is greater than the length of the head; and / or A disassembly portion is provided at one end of the head portion away from the rod portion.

12. The rotor assembly according to claim 10, characterized in that: The rotor center hole further includes a second front shaft hole segment, the second front shaft hole segment is located in the front shaft, the second front shaft hole segment is coaxial with the first front shaft hole segment and is connected to an end of the first front shaft hole segment away from the magnet hole segment; The rod portion further includes a second front axle mating section, which is connected to an end of the first front axle mating section away from the magnet mating section and is arranged coaxially with the first front axle mating section; The second front axle mating section is located in the second front axle hole section.

13. The rotor assembly according to claim 12, characterized in that: The inner diameter of the second front axle hole section is greater than the inner diameter of the first front axle hole section; and / or The diameter of the second front axle fitting section is smaller than the diameter of the first front axle fitting section.

14. A motor, characterized in that Comprising a rotor assembly as claimed in any one of claims 1 to 13.

15. The device, characterized in that Comprising the motor as claimed in claim 14.

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