Rotor assembly and motor having the same

Abstract

The present invention discloses a rotor assembly and a motor having the same. The rotor assembly includes a rotor core, a permanent magnet, a rotating shaft, a transmission member and a second end vibration damping member. The rotor core has a magnet slot and a rotating shaft hole. The permanent magnet is arranged in the magnet slot. The rotating shaft is arranged in the rotating shaft hole and there is a gap between the rotating shaft and the rotor core. The first end and the second end of the rotating shaft extend out of the rotating shaft hole. The first end vibration damping member is arranged on the first end face of the rotor core and connected to the rotor core. The transmission member is arranged in the first end vibration damping member and the transmission member cooperates with the rotating shaft. The second end vibration damping member is arranged on the second end face of the rotor core and connected to the rotor core. The second end vibration damping member directly cooperates with the rotating shaft. The rotor core drives the rotating shaft through the second end vibration damping member and sequentially through the first end vibration damping member and the transmission member. The rotor assembly of the present invention increases the material amount of the vibration damping member, has good noise reduction and vibration reduction effects, and has high reliability.

Description

Technical Field

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

[0002] As the power density of the motor increases, the energy density of the motor increases, and the motor magnetic field tends to be deeply saturated, resulting in increased electromagnetic noise. In the related art, in order to reduce the electromagnetic vibration and noise caused by torque fluctuations during the operation of the motor, it is usually adopted to fill vibration-damping materials between the rotor core and the shaft or sleeve to absorb electromagnetic force waves, so as to reduce the noise of the motor and achieve vibration reduction. In the related art, by filling vibration-damping materials between the rotor core and the shaft or sleeve, the effect of noise reduction and vibration reduction is poor and needs to be improved. Summary of the invention

[0003] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0004] In the related art, the damping rotor assembly includes a permanent magnet, an outer iron core, a rotating shaft, an injection molded body and a damping ring. The injection molded body includes an upper end plate, a lower end plate and a plastic sealing connection portion connecting the upper end plate and the lower end plate. An annular boss is axially protruded on the upper end plate and / or the lower end plate. The inner iron core is mounted on the rotating shaft and embedded in the groove of the annular boss. The damping ring is arranged between the inner iron core and the inner wall of the groove. On the one hand, due to the limited gap between the inner iron core and the inner wall of the groove, the amount of material of the damping part is limited, and the noise reduction and vibration reduction effects are poor. On the other hand, the injection molded part and the damping ring are made of different materials, the damping ring at the end of the outer iron core is not connected, and the boundary surface between the injection molded part and the damping ring is prone to gaps, and reliability problems caused by different coefficients such as thermal expansion are prone to occur during operation. In addition, the damping of the injection molded part is small, and the suppression effect on electromagnetic vibration noise is not obvious. On the other hand, the damping rotor assembly needs to be injected and placed in the production process. The process is complicated and the defect rate is high during mass production.

[0005] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, an embodiment of the present invention proposes a rotor assembly that can increase the material amount of the vibration damping parts, reduce noise and vibration and has high reliability without affecting the electromagnetic field magnetic circuit.

[0006] Another aspect of the present invention provides an electric motor.

[0007] According to the first aspect of the embodiments of the present invention, the rotor assembly includes: a rotor core, the rotor core having a magnet slot and a shaft hole; a permanent magnet, the permanent magnet is arranged in the magnet slot; a shaft, the shaft is arranged in the shaft hole and there is a gap between the shaft and the rotor core, the first end and the second end of the shaft extend out of the shaft hole; a first end damper, the first end damper is arranged on the first end surface of the rotor core and connected to the rotor core; a transmission member, the transmission member is arranged in the first end damper, the transmission member cooperates with the shaft; a second end damper, the second end damper is arranged on the second end surface of the rotor core and connected to the rotor core, the second end damper directly cooperates with the shaft, and the rotor core drives the shaft through the second end damper and sequentially through the first end damper and the transmission member.

[0008] According to the rotor assembly of the embodiment of the present invention, a first end vibration damping member that cooperates with the rotating shaft through a transmission member is arranged on the first end face of the rotor core, thereby avoiding a rigid connection between the rotating shaft and the rotor core. The transmission member improves the rotation effect of the rotating shaft, and the vibration damping member has a large amount of material, good noise reduction and vibration reduction effects, and does not have the problem of different thermal expansion coefficients, thereby improving the reliability of the rotor assembly. Moreover, only the vibration damping member needs to be arranged during the production process, the preparation process is simple, and the defective rate of mass production is reduced.

[0009] In some embodiments, a portion of the first end vibration damper is directly matched with the rotating shaft, and the rotor core drives the rotating shaft through the portion of the first end vibration damper and in turn through the first end vibration damper and the transmission member.

[0010] In some embodiments, the materials of the first end vibration dampening member and the second end vibration dampening member are both viscoelastic materials.

[0011] In some embodiments, the loss factor of the viscoelastic material is greater than or equal to 0.15.

[0012] In some embodiments, the viscoelastic material has a Shore hardness of 20 degrees to 80 degrees.

[0013] In some embodiments, the transmission member includes a base and a boss, the boss protrudes from the base toward the first end face of the rotor core, and the rotating shaft passes through the base and the boss; the minimum distance between the boss and the first end face of the rotor core in the axial direction of the rotor core is L1, and L1>0.5 mm.

[0014] In some embodiments, the minimum gap between the boss and the permanent magnet in the radial direction of the rotor core is L2, and L2>0.5 mm.

[0015] In some embodiments, the minimum gap between the base and the permanent magnet in the axial direction of the rotor core is L3, and L3>0.5 mm.

[0016] In some embodiments, the rotor assembly also includes an externally connected vibration damper, the rotor core has an axial through hole located between adjacent magnet slots, the externally connected vibration damper is arranged in the axial through hole, the first end of the externally connected vibration damper is connected to the first end vibration damper, and the second end of the externally connected vibration damper is connected to the second end vibration damper.

[0017] In some embodiments, the rotor assembly also includes an internally connected vibration damper, which is disposed in a gap between the rotating shaft and the rotor core, wherein a first end of the internally connected vibration damper is connected to the first end vibration damper, and a second end of the internally connected vibration damper is connected to the second end vibration damper.

[0018] In some embodiments, the rotor assembly also includes an intermediate connecting vibration damper, and there is a gap between the inner surface of the permanent magnet and the inner bottom surface of the magnet slot. The intermediate connecting vibration damper is arranged in the gap, and the first end of the intermediate connecting vibration damper is connected to the first end vibration damper, and the second end of the intermediate connecting vibration damper is connected to the second end vibration damper.

[0019] In some embodiments, the rotor core is formed by stacking a plurality of rotor punchings along the axial direction of the rotor core, the rotor punchings include full-bridge punchings and half-bridge punchings, the rotor core has a first end, a second end and a middle section located between the first end and the second end, the first end and the second end are formed by stacking a plurality of the full-bridge punchings, and the middle section is formed by stacking a plurality of the half-bridge punchings.

[0020] In some embodiments, among the half-bridge punches adjacent to each other in the axial direction of the rotor core in the middle section, one half-bridge punch is rotated by one magnetic pole relative to the other half-bridge punch along the circumferential direction of the rotor core.

[0021] In some embodiments, a portion of the multiple internal magnetic bridges of the semi-connected bridge punching sheets are provided with magnetic bridge holes that penetrate the internal magnetic bridges along the circumferential direction of the rotor core. In the internal magnetic bridges of the semi-connected bridge punching sheets adjacent in the axial direction of the rotor core, the internal magnetic bridge of one semi-connected bridge punching sheet is provided with the magnetic bridge hole, and the internal magnetic bridge of the other semi-connected bridge punching sheet has no magnetic bridge hole. A circumferential connecting vibration damper is provided in the magnetic bridge hole, and adjacent intermediate connecting vibration dampers are connected to each other through the circumferential connecting vibration damper.

[0022] In some embodiments, the first end vibration damper, the second end vibration damper, the inner connection vibration damper, the outer connection vibration damper, the middle connection vibration damper and the circumferential connection vibration damper are formed by integral injection molding of viscoelastic material.

[0023] In some embodiments, the transmission member has a transmission radial protrusion and a transmission radial opening groove located between adjacent transmission radial protrusions on its outer peripheral wall, the end vibration damping member has a center hole, the center hole has a vibration damping radial protrusion and a radial vibration damping opening groove located between adjacent vibration damping radial protrusions on its peripheral wall, the transmission radial protrusion fits in the vibration damping radial opening groove, and the vibration damping radial protrusion fits in the transmission radial opening groove.

[0024] The electric machine according to the embodiment of the second aspect of the present invention comprises the rotor assembly described in any one of the above embodiments.

[0025] According to the motor of the embodiment of the present invention, a first end vibration damping member that cooperates with the rotating shaft through a transmission member is provided on the first end face of the rotor core in the rotor assembly, thereby avoiding a rigid connection between the rotating shaft and the rotor core. The transmission member improves the rotation effect of the rotating shaft, and the vibration damping member has a large amount of material, good noise reduction and vibration reduction effects, and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is an exploded perspective view of a rotor assembly according to one embodiment of the present invention.

[0027] Figure 2 yes Figure 1 Schematic diagram of the assembled state of the rotor assembly shown.

[0028] Figure 3 yes Figure 2 An axial cross-sectional view of the rotor assembly is shown.

[0029] Figure 4 yes Figure 3 An enlarged schematic diagram of part A in FIG.

[0030] Figure 5 yes Figure 2 A cross-sectional view of the damper rotor is shown.

[0031] Figure 6 Schematic diagram of a rotor core of a rotor assembly according to an embodiment of the present invention.

[0032] Figure 7 Detailed description of the invention Figure 4 is a three-dimensional schematic diagram of a transmission component of a rotor assembly according to an embodiment of the present invention.

[0033] Figure 8 is a plan view of a transmission member of a rotor assembly according to an embodiment of the present invention.

[0034] Fig. 9 Schematic diagram of a semi-connected bridge-type punching sheet of a rotor assembly according to an embodiment of the present invention.

[0035] Fig.10 Schematic diagram of a fully connected bridge-type punching sheet of a rotor assembly according to an embodiment of the present invention.

[0036] Fig.11 yes Figure 1 Another axial cross-sectional view of the rotor assembly is shown.

[0037] Fig.12 yes Figure 1 A side view of the rotor assembly is shown.

[0038] Fig.13 is another stereoscopic schematic diagram of a transmission component of a rotor assembly according to an embodiment of the present invention.

[0039] Fig.14 3 is a comparison chart of the damping ratio of the rotor assembly according to an embodiment of the present invention and the prior art.

[0040] Reference numerals:

[0041] The rotor assembly 100,

[0042] The rotor core 10, the shaft hole 101, the magnet slot 102, the axial through hole 103, the magnetic bridge hole 104, the gap 105,

[0043] Full bridge punching piece 110, half bridge punching piece 120, punching piece body 111, outer magnetic bridge 112, inner magnetic bridge 113, magnetic pole 114, protrusion 115,

[0044] Permanent magnet 20,

[0045] The vibration damper 60, the first end vibration damper 61, the plate portion 610, the boss portion 611, the opening 612, the first vibration damper radial inner opening groove 615, the first vibration damper radial inner protrusion 616, the first center hole 617, the second end vibration damper 62, the outer connection vibration damper 63, the middle connection vibration damper 64, the inner connection vibration damper 65, the circumferential connection vibration damper 66,

[0046] Transmission member 51 , transmission radial protrusion 510 , transmission radial opening groove 511 , base 513 , boss 514 . DETAILED DESCRIPTION

[0047] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0048] like Figure 1-10As shown, the rotor assembly 100 according to the embodiment of the present invention includes a rotor core 10 , a permanent magnet 20 , a rotating shaft 30 , a vibration damping member 60 and a transmission member 51 .

[0049] The rotor core 10 has a magnet slot 102 and a shaft hole 101. Figure 1 and Figure 6 As shown, the shaft hole 101 is arranged at the substantially central position of the rotor core 10 and along the axial direction ( Figure 1 and Figure 6 The rotor core 10 is provided with a plurality of magnet slots 102, and the plurality of magnet slots 102 are evenly spaced around the shaft hole 101 along the circumference of the rotor core 10.

[0050] The permanent magnet 20 is disposed in the magnet slot 102. Figure 1 and Figure 6 As shown, there are a plurality of permanent magnets 20 , and one permanent magnet 20 is installed in each magnet slot 102 , so that the plurality of permanent magnets 20 are arranged at intervals along the circumferential direction of the rotor core 10 .

[0051] The rotating shaft 30 is disposed in the rotating shaft hole 101, and there is a gap between the rotating shaft 30 and the rotor core 10. Figure 3 As shown, the inner hole diameter D1 of the rotor core 10 is larger than the shaft diameter D2, that is, D1>D2. The first end ( Figure 1-Figure 3 The left end of the rotating shaft 30) and the second end ( Figure 1-Figure 3 The right end of the rotating shaft 30 extends out from the rotating shaft hole 101. Figure 1-Figure 3 As shown, the axial direction of the rotating shaft 30 is substantially consistent with the axial direction of the rotor core 10 and the rotating shaft 30 is penetrated through the rotating shaft hole 101 on the rotor core 10 .

[0052] The vibration damper 60 includes a first end vibration damper 61, which is disposed on a first end surface ( Figure 1-Figure 3 On the left end surface of the rotor core 10) and connected to the rotor core 10.

[0053] The transmission member 51 is disposed in the first end damping member 61, and the transmission member 51 cooperates with the rotating shaft 31. The rotor core 10 drives the rotating shaft 30 at least sequentially through the first end damping member 61 and the transmission member 51. In other words, since there is a gap between the inner circumferential wall of the rotating shaft hole 101 of the rotor core 10 and the rotating shaft 30, the rotor core 10 does not directly drive the rotating shaft 30, but drives the rotating shaft 30 to rotate at least through the first end damping member 61 and the transmission member 51.

[0054] The vibration damping member 60 further includes a second end vibration damping member 62, which is disposed on the second end surface ( Figure 1-Figure 3 The rotor core 10 is on the right end surface thereof and is connected to the rotor core 10. Figure 1and Figure 3 As shown, the second end vibration damper 62 is directly matched with the rotating shaft 30, and the rotor core 10 drives the rotating shaft through the second end vibration damper 62 and in turn through the first end vibration damper 61 and the transmission member 51.

[0055] According to the rotor assembly of the embodiment of the present invention, a first end vibration damping member that cooperates with the rotating shaft through a transmission member is arranged on the first end face of the rotor core, thereby avoiding a rigid connection between the rotating shaft and the rotor core. The transmission member improves the rotation effect of the rotating shaft, and the vibration damping member has a large material volume and good noise reduction and vibration reduction effects. There is no problem of different thermal expansion coefficients, which improves the reliability of the rotor assembly. In addition, only vibration damping members need to be arranged during the production process, the preparation process is simple, and the defective rate of mass production is reduced.

[0056] In some embodiments, the materials of the first end vibration damper 61 and the second end vibration damper 62 are both viscoelastic materials, such as rubber, thermoplastic materials, etc. The present application can greatly absorb the energy generated by resonance by using viscoelastic materials to achieve a vibration reduction effect.

[0057] like Fig.14 As shown, the present application can greatly improve the rotor damping ratio by designing the rotor core end face with full viscoelastic material. Compared with the end structure of the ordinary rotor (rigid connection) and the added injection molded parts (end plate) and vibration damping ring, the end structure of the present application using full viscoelastic material has a larger damping ratio.

[0058] In some specific embodiments, the loss factor of the viscoelastic material is greater than or equal to 0.15, thereby ensuring that the electromagnetic force wave is effectively absorbed and attenuated when the motor rotor is running.

[0059] Furthermore, the Shore hardness of the viscoelastic material is 20 degrees to 80 degrees, thereby improving the manufacturability of the motor, for example, the Shore hardness is 30 degrees, 40 degrees, or 50 degrees.

[0060] In some embodiments, a portion of the first end vibration damper 61 directly cooperates with the rotating shaft 30, and the rotor core 10 drives the rotating shaft 30 through a portion of the first end vibration damper 61 and in turn through the first end vibration damper 61 and the transmission member 51.

[0061] like Figure 1 , 3As shown in FIG. 4 , the transmission member 51 is located on the left side of a portion of the first end vibration damper 61. The left end of the rotating shaft 30 sequentially passes through the rotor core 10, a portion of the first end vibration damper 61 and the transmission member 51 and extends out. The transmission member 51 and a portion of the first end vibration damper 61 are directly matched with the rotating shaft 30. Therefore, when the rotor core 10 rotates, the first end vibration damper 61 is driven to rotate, and then the rotating shaft 30 is driven to rotate through a portion of the first end vibration damper 61 and the transmission member 51. The thickness of a portion of the first end vibration damper 61 in the axial direction of the rotating shaft 30 is L, where L≥0.5 mm. Therefore, while increasing the material amount of the vibration damper, the connection between the vibration damper and the rotor core is more reliable.

[0062] In some embodiments, the transmission member 51 includes a base 513 and a boss 514 , the boss 514 protrudes from the base 513 toward the first end surface of the rotor core 10 , and the rotating shaft 30 passes through the base 513 and the boss 514 .

[0063] like Figure 1 , 13 As shown in Figures 11 and 12, the boss 514 faces the left end surface of the rotor core 10, the base 513 cooperates with the first center hole 617 of the first end vibration damper 61, and the boss 514 is located inside the first end vibration damper 61. The base 513 and the boss 514 are both provided with through holes, and the shaft 30 passes through the base 513 and the boss 514 through the corresponding through holes.

[0064] When the permanent magnet extends beyond the end face of the rotor core, the protrusion can be embedded in the center ring formed by the circumferential arrangement of the permanent magnet along the axial direction of the rotor core, which can improve the torque transmission ability of the transmission part and the fatigue reliability of the vibration damping part, and can also reduce the axial length of the rotor assembly, which is beneficial to the miniaturization design of the motor.

[0065] In some embodiments, the minimum distance between the boss 514 and the first end surface of the rotor core 10 in the axial direction of the rotor core 10 is L1, and L1>0.5 mm. Thus, while increasing the amount of material of the vibration damping member, the connection between the vibration damping member and the rotor core is more reliable. Moreover, it is not only beneficial to improve the vibration damping performance of the rotor, but also beneficial to the fluidity of the vibration damping material when injection molding is used to improve the manufacturability of the injection molding process.

[0066] In some embodiments, Fig.12 As shown, the minimum gap between the boss 514 and the permanent magnet 20 in the radial direction of the rotor core 10 is L2, and L2>0.5 mm. Thus, while increasing the amount of material of the vibration damping member, the connection between the vibration damping member and the rotor core is made more reliable. Moreover, it is not only beneficial to improve the vibration damping performance of the rotor, but also beneficial to the fluidity of the vibration damping material during injection molding, and improves the manufacturability of the injection molding process.

[0067] In some embodiments, Fig.11As shown, the minimum gap between the base 513 and the permanent magnet 20 in the axial direction of the rotor core 10 is L3, and L3>0.5 mm. Thus, while increasing the amount of material of the vibration damping member, the connection between the vibration damping member and the rotor core is more reliable. Moreover, it is not only beneficial to improve the vibration damping performance of the rotor, but also beneficial to the fluidity of the vibration damping material during injection molding, and improves the manufacturability of the injection molding process.

[0068] It is understandable that the transmission member 51 of the present application is not limited to Fig.13 As shown, for example, in some other embodiments, Figure 7 As shown, the transmission member 51 has no boss.

[0069] In some embodiments, Figure 1 and Figure 3 As shown, the vibration damper 60 further includes an external connection vibration damper 63. The rotor core 10 has an axial through hole 103 located between adjacent magnet slots 102. The external connection vibration damper 63 is disposed in the axial through hole 103. The first end ( Figure 1 The left end of the middle and outer connecting vibration damping member 63 is connected to the first end vibration damping member 61, and the second end of the outer connecting vibration damping member 63 ( Figure 1 The right end of the middle and outer connecting vibration damping member 63 is connected to the second end vibration damping member 62.

[0070] like Figure 1 As shown, there are multiple externally connected vibration dampers 63, and the multiple externally connected vibration dampers 63 are arranged at intervals along the circumference of the rotor core 10, thereby further increasing the material amount of the vibration damper, improving the noise reduction capability and vibration reduction effect, and also making the connection between the first end vibration damper and the second end vibration damper and the rotor core more reliable.

[0071] In some embodiments, Figure 1 and Figure 3 As shown, the vibration damping member 60 further includes an inner connecting vibration damping member 65, which is disposed in the gap between the rotating shaft 30 and the rotor core 10. The first end ( Figure 4 The left end of the inner connecting vibration damping member 65 is connected to the first end vibration damping member 61, and the second end of the inner connecting vibration damping member 65 ( Figure 4 The right end of the middle inner connecting vibration damping member 65 is connected to the second end vibration damping member 62.

[0072] like Figure 1 and Figure 3As shown, the inner connection vibration damper 65 is connected between the first end vibration damper 61 and the second end vibration damper 62, and a plurality of outer connection vibration dampers 63 surround the outer side of the inner connection vibration damper 65. The inner connection vibration damper 65 surrounds the rotating shaft 30 and directly cooperates with the rotating shaft 30. This further increases the material volume of the vibration damper, improves the noise reduction capability and vibration reduction effect, and the inner connection vibration damper directly cooperates with the rotating shaft, further improving the reliability of the vibration damper transmission.

[0073] In some embodiments, Figure 1 As shown, the vibration damping member 60 further includes an intermediate connecting vibration damping member 64. There is a gap 105 between the inner surface of the permanent magnet 20 and the inner bottom surface of the magnet slot 102. The intermediate connecting vibration damping member 64 is arranged in the gap 105. The first end ( Figure 1 The left end of the middle connecting vibration damping member 64 is connected to the first end vibration damping member 61, and the second end of the middle connecting vibration damping member 64 ( Figure 1 The right end of the middle connecting vibration damping member 64 is connected to the second end vibration damping member 62.

[0074] like Figure 1 As shown, there are multiple intermediate connection dampers 64, which are arranged at intervals along the circumference of the rotor core 10, and the intermediate connection dampers 64 are arranged between the outer connection dampers 63 and the inner connection dampers 65. Thus, the material amount of the dampers is increased, and the connection between the dampers and the rotor core is more reliable.

[0075] In some embodiments, the rotor core 10 is formed by stacking a plurality of rotor punchings along the axial direction of the rotor core 10, the rotor punchings 10 include full-bridge punchings 110 and half-bridge punchings 120, the rotor core 10 has a first end, a second end and a middle section between the first end and the second end, the first end and the second end are formed by stacking a plurality of full-bridge punchings 110, and the middle section is formed by stacking a plurality of half-bridge punchings 120.

[0076] like Figure 6 , 9 As shown in FIG. 10 , the rotor punching sheet includes a punching sheet body 111, an outer magnetic bridge 112, an inner magnetic bridge 113 and magnetic poles 114. The plurality of magnetic poles 114 are arranged at intervals along the circumference of the rotor core 10, and at least part of the magnetic poles 114 are connected to the punching sheet body 111 through the inner magnetic bridge 113. The plurality of rotor punching sheets forming the rotor core 10 include both full-bridge punching sheets 110 and half-bridge punching sheets 120. The full-bridge punching sheets 110 are located at both ends of the rotor core 10, and the half-bridge punching sheets 120 are located in the middle of the rotor core 10.

[0077] like Fig. 9As shown, among the multiple magnetic poles 114 of the semi-bridge punching sheet 120, a portion of the magnetic poles 114 are connected to the punching sheet body 111 through the internal magnetic bridge 113, and another portion of the magnetic poles 114 are spaced apart from the punching sheet body 111 in the radial direction of the rotor core 10, wherein a portion of the magnetic poles 114 and another portion of the magnetic poles 114 are alternately arranged along the circumferential direction of the rotor core 10. The outer magnetic bridge 112 of the semi-bridge punching sheet 120 is disconnected between adjacent magnetic poles 114.

[0078] like Fig.10 As shown, among the multiple magnetic poles 114 of the full-bridge punching sheet 110, each magnetic pole 114 is connected to the punching sheet body 111 through an internal magnetic bridge 113, and the external magnetic bridge 112 of the half-bridge punching sheet 110 is closed.

[0079] In this embodiment, by arranging the full-bridge punching sheet at the end of the rotor core, it is not only beneficial to the mold sealing of the injection molding process, preventing the injection liquid from seeping out and causing burrs and flash on the molded product, but also can improve the stiffness and strength of the rotor core.

[0080] In some embodiments, among the adjacent half-bridge punching sheets 110 in the middle section, one half-bridge punching sheet 110 rotates one magnetic pole 114 along the circumference of the rotor core 10 relative to the other half-bridge punching sheet 110. Thus, the inner magnetic bridge of the rotor core forms an alternately connected and disconnected structure in the axial direction, which can improve the electromagnetic performance of the motor and thus reduce energy consumption.

[0081] A portion of the multiple internal magnetic bridges 113 of the semi-bridge punching piece 120 is provided with a magnetic bridge hole 104 which passes through the internal magnetic bridge 113 along the circumferential direction of the rotor core 10. In the internal magnetic bridges 113 of the semi-bridge punching pieces 120 adjacent in the axial direction of the rotor core 10, the internal magnetic bridge 113 of one semi-bridge punching piece 120 is provided with a magnetic bridge hole 104, and the internal magnetic bridge 113 of the other semi-bridge punching piece 120 is not provided with a magnetic bridge hole 104. A circumferentially connected vibration damper 66 is provided in the magnetic bridge hole 104, and adjacent intermediate connected vibration dampers 64 are connected to each other via the circumferentially connected vibration dampers 66.

[0082] like Figure 6 As shown, a magnetic bridge hole 104 is provided in the inner magnetic bridge 113 of one half-bridge punch 120, and no magnetic bridge hole 104 is provided in the inner magnetic bridge 113 of the other half-bridge punch 120, and the half-bridge punch 120 with the magnetic bridge hole 104 and the half-bridge punch 120 without the magnetic bridge hole 104 are arranged alternately. The circumferential connection dampers 66 are arranged in multiple rows spaced apart along the axial direction of the rotor core 10, and each row includes multiple circumferential connection dampers 66 spaced apart along the circumference of the rotor core 10, wherein the multiple circumferential connection dampers 66 in each row connect the adjacent intermediate connection dampers 64.

[0083] In some embodiments, the first end vibration damper 61, the second end vibration damper 62, the inner connection vibration damper 65, the outer connection vibration damper 63, the middle connection vibration damper 64 and the circumferential connection vibration damper 66 are integrally formed by injection molding of viscoelastic material. In the present application, the damping characteristics of the rotor core can be improved by filling the inside, ends and magnetic bridge holes of the rotor core with viscoelastic material, and the noise reduction and vibration reduction performance can be further improved.

[0084] Moreover, the viscoelastic materials (the first end damping member 61 and the second end damping member 62) on both sides of the rotor core end face are connected. In the actual manufacturing process, the damping material can be filled on both ends of the mold for integral molding, thereby improving the manufacturability of the motor. Moreover, the connection between the damping member and the rotor core is tight and reliable, and is not easy to separate, thereby improving stability.

[0085] In some specific embodiments, the loss factor of the viscoelastic material is greater than or equal to 0.15, and the Shore hardness of the viscoelastic material is 20 degrees to 80 degrees, thereby ensuring that the electromagnetic force wave is effectively absorbed and attenuated when the motor rotor is running, and improving the manufacturability of the motor. For example, the Shore hardness is 30 degrees, 40 degrees, and 50 degrees.

[0086] In some embodiments, Figure 1 , 2 As shown in FIGS. 7 and 8 , a transmission radial protrusion 510 and a transmission radial opening groove 511 located between adjacent transmission radial protrusions 510 are provided on the outer peripheral wall of the transmission member 51. The first end damping member 61 has a first center hole 617, and a first vibration damping radial protrusion 616 and a first radial vibration damping opening groove 615 located between adjacent first vibration damping radial protrusions 616 are provided on the inner peripheral wall of the first center hole 617. The transmission radial protrusion 510 fits in the first vibration damping radial opening groove 615, and the first vibration damping radial protrusion 616 fits in the transmission radial opening groove 511.

[0087] like Figure 1 , 2 As shown in FIGS. 7 and 8, a plurality of transmission radial protrusions 510 and a plurality of transmission radial opening grooves 511 are provided on the outer peripheral wall of the transmission member 51. The tapered angle of the transmission radial opening grooves 511 is α≥5° and gradually decreases radially outward. The plurality of transmission radial protrusions 510 are arranged at intervals along the circumference of the rotor core 10, and a first transmission radial opening groove 511 is formed between every two adjacent transmission radial protrusions 510.

[0088] A plurality of first vibration-damping radial protrusions 616 and a plurality of first radial vibration-damping inwardly opening grooves 615 are provided on the peripheral wall of the first center hole 617 of the first end vibration damping member 61. The plurality of first vibration-damping radial protrusions 616 are arranged at intervals along the circumference of the rotor core 10, and a first radial vibration-damping inwardly opening groove 615 is formed between every two adjacent first vibration-damping radial protrusions 616.

[0089] The transmission member 51 is disposed in the first end vibration damping member 61 , and the transmission radial protrusion 510 is fitted in the first radial vibration damping inward opening groove 615 , and the first vibration damping radial protrusion 616 is fitted in the transmission radial opening groove 511 .

[0090] In some embodiments, the axial length of the permanent magnet 20 in the rotor core 10 is greater than the axial length of the magnet slot 102, the first end of the permanent magnet 20 extends from the magnet slot 102 and fits in the first end vibration damper 61, and the second end of the permanent magnet 20 extends from the magnet slot 102 and fits in the second end vibration damper 62. The rotor assembly of this embodiment not only improves the electromagnetic performance of the motor and reduces energy consumption, but also enables the vibration damper of the rotor assembly to withstand greater torque.

[0091] In some embodiments, each of the first end vibration damper 61 and the second end vibration damper 62 is provided with an opening 612 for exposing a portion of the rotor core 10 .

[0092] like Figure 1 As shown, the first end vibration damper 61 and the second end vibration damper 62 both include a plate portion 610 and a boss portion 611. The outer circumferential surface of the plate portion 610 is provided with an opening 612. The opening 612 may be multiple, and the multiple openings 612 are arranged at intervals along the circumference of the plate portion 610 to expose the left end portion of the rotor core, thereby solving the problem of insufficient structural rigidity of the rotor assembly during overall magnetization, ensuring that the rotor assembly will not be significantly deformed or loosened during overall magnetization, thereby achieving overall magnetization of the rotor assembly and improving magnetization efficiency.

[0093] A plurality of openings 612 are provided on the first end vibration damper 61, and a plurality of openings 612 are provided on the second end vibration damper 62. The projections of the openings 612 provided on the first end vibration damper 61 and the second end vibration damper 62 on the end surface of the rotor core 10 overlap. The positioning member installed through the opening 612 can support the rotor core 10, so that the rotor core 10 is fixed between the first end vibration damper 61 and the second end vibration damper 62.

[0094] Since the projections of the openings 612 on the first end vibration damper 61 and the second end vibration damper 62 on the end surface of the rotor core 10 overlap, the force points on the first end surface and the second end surface of the rotor core 10 are the same, and the force is more uniform.

[0095] The position of the opening 612 is not limited to the outer peripheral surface of the end vibration damper. For example, in some other embodiments, the opening 612 can be arranged on the plate portion 610 or the boss portion 611 of the first end vibration damper 61 and the second end vibration damper 62, as long as a portion of the rotor core 10 can be exposed to facilitate the positioning member to support the rotor core 10.

[0096] Please refer to the following Figure 1-10 Some specific exemplary rotor assemblies according to the present invention are described.

[0097] like Figure 1-3 As shown, the rotor assembly 100 according to the embodiment of the present invention includes a rotor core 10 , a plurality of permanent magnets 20 , a rotating shaft 30 , a transmission member 51 and a vibration reduction member 60 .

[0098] The rotor core 10 has a shaft hole 101, a plurality of magnet slots 102, a plurality of axial through holes 103 and a plurality of magnetic bridge holes 104. The shaft hole 101 is disposed substantially at the center of the rotor core 10 and penetrates the rotor core 10 in the axial direction of the rotor core 10. The plurality of magnet slots 102 are evenly spaced around the shaft hole 101 in the circumferential direction of the rotor core 10. An axial through hole 103 is disposed between any adjacent magnet slots 102.

[0099] The rotor core 10 is formed by stacking a plurality of rotor punchings along the axial direction of the rotor core 10 , wherein the rotor punchings located at the left and right ends are full-bridge punchings 110 , and the rotor punchings located in the middle are half-bridge punchings 120 .

[0100] The rotor punching sheet includes a punching sheet body 111, an outer magnetic bridge 112, an inner magnetic bridge 113 and a magnetic pole 114. Among the multiple magnetic poles 114 of the full-bridge punching sheet 120, each magnetic pole 114 is connected to the punching sheet body 111 through an inner magnetic bridge 113, a plurality of protrusions 115 arranged at intervals are arranged on the outer periphery of the punching sheet body 111, a protrusion 115 is arranged between adjacent inner magnetic bridges 113, and the outer magnetic bridge 112 of the half-bridge punching sheet 110 is closed.

[0101] The outer magnetic bridge 112 of the half-bridge punching sheet 120 is disconnected between adjacent magnetic poles 114. Among the multiple magnetic poles 114 of the half-bridge punching sheet 120, a part of the magnetic poles 114 are connected to the punching sheet body 111 through the inner magnetic bridge 113, and the other part of the magnetic poles 114 are separated from the punching sheet body 111 in the radial direction of the rotor core 10, wherein a part of the magnetic poles 114 and another part of the magnetic poles 114 are alternately arranged along the circumference of the rotor core 10. Among the adjacent half-bridge punching sheets 110 in the middle part, one half-bridge punching sheet 110 rotates one magnetic pole 114 relative to the other half-bridge punching sheet 110 along the circumference of the rotor core 10. As a result, the inner magnetic bridge of the rotor core forms an alternately connected and disconnected structure in the axial direction, which can improve the electromagnetic performance of the motor and thus reduce energy consumption.

[0102] A portion of the multiple internal magnetic bridges 113 of the semi-bridge punching piece 120 is provided with a magnetic bridge hole 104 which passes through the internal magnetic bridge 113 along the circumferential direction of the rotor core 10. In the internal magnetic bridges 113 of the semi-bridge punching pieces 120 adjacent in the axial direction of the rotor core 10, the internal magnetic bridge 113 of one semi-bridge punching piece 120 is provided with a magnetic bridge hole 104, while the internal magnetic bridge 113 of the other semi-bridge punching piece 120 has no magnetic bridge hole 104.

[0103] The plurality of permanent magnets 20 are respectively disposed in the plurality of magnet slots 102 so that the plurality of permanent magnets 20 are arranged at intervals along the circumferential direction of the rotor core 10. A gap 105 is defined between the inner surface of each permanent magnet 20 and the inner bottom surface of the corresponding magnet slot 102.

[0104] The axial direction of the rotating shaft 30 is substantially consistent with the axial direction of the rotor core 10 and the rotating shaft 30 is passed through the rotating shaft hole 101 on the rotor core 10 , and a gap is provided between the rotating shaft 30 and the rotor core 10 .

[0105] The vibration damper 6 includes a first end vibration damper 61 , a second end vibration damper 62 , an outer connection vibration damper 63 , an intermediate connection vibration damper 64 , an inner connection vibration damper 65 and a circumferential connection vibration damper 66 .

[0106] The first end vibration damper 61 is connected to the left end surface of the rotor core 10, and the second end vibration damper 62 is connected to the right end surface of the rotor core 10. The rotating shaft 30 passes through the first end vibration damper 61, the rotor core 10 and the second end vibration damper 62 in sequence from left to right. A portion of the inner circumference of the first end vibration damper 61 is directly matched with the outer circumference of the rotating shaft 30, and the inner circumference of the second end vibration damper 62 is directly matched with the outer circumference of the rotating shaft 30.

[0107] The first end vibration damper 61 and the second end vibration damper 62 each include a plate portion 610 and a boss portion 611. The outer circumferential surface of the plate portion 610 is provided with a plurality of openings 612, and the plurality of openings 612 are arranged at intervals along the circumferential direction of the plate portion 610. The boss portion 611 of the first end vibration damper 61 protrudes to the left from the left end surface of the first end vibration damper 61, and the boss portion 621 of the second end vibration damper 62 protrudes to the right from the right end surface of the second end vibration damper 62.

[0108] A plurality of first vibration-damping radial protrusions 616 and a plurality of first radial vibration-damping inwardly opening grooves 615 are provided on the peripheral wall of the first center hole 617 of the first end vibration damping member 61. The plurality of first vibration-damping radial protrusions 616 are arranged at intervals along the circumference of the rotor core 10, and a first radial vibration-damping inwardly opening groove 615 is formed between every two adjacent first vibration-damping radial protrusions 616.

[0109] The inner connection damper 65 is disposed in the gap between the rotating shaft 30 and the rotor core 10 , and the left end of the inner connection damper 65 is connected to the first end damper 61 , and the right end of the inner connection damper 65 is connected to the second end damper 62 .

[0110] The external connection damper 63 is disposed in the axial through hole 103, and the left end of the external connection damper 63 is connected to the first end damper 61, and the right end of the external connection damper 63 is connected to the second end damper 62. Thus, there are multiple external connection dampers 63, which are arranged at intervals along the circumferential direction of the rotor core 10 and surround the outer side of the internal connection damper 65.

[0111] The intermediate connection vibration damper 64 is arranged in the gap 105, the left end of the intermediate connection vibration damper 64 is connected to the first end vibration damper 61, and the right end of the intermediate connection vibration damper 64 is connected to the second end vibration damper 62. Therefore, there are multiple intermediate connection vibration dampers 64, and the multiple intermediate connection vibration dampers 64 are arranged at intervals along the circumferential direction of the rotor core 10, and the intermediate connection vibration damper 64 is arranged between the outer connection vibration damper 63 and the inner connection vibration damper 65.

[0112] The circumferentially connected vibration dampers 66 are arranged into a plurality of rows spaced apart along the axial direction of the rotor core 10 , each row comprising a plurality of circumferentially connected vibration dampers 66 spaced apart along the circumference of the rotor core 10 , wherein the plurality of circumferentially connected vibration dampers 66 in each row are connected to adjacent intermediate connected vibration dampers 64 .

[0113] The first end vibration damper 61, the second end vibration damper 62, the middle connection vibration damper 64, the outer connection vibration damper 63, the inner connection vibration damper 65 and the circumferential connection vibration damper 66 are integrally formed by injection molding, and the material is rubber or thermoplastic elastomer. Therefore, the vibration damper has lower hardness and rigidity, good vibration damping effect, and is tightly and reliably connected to the rotor core, not easy to separate, and improves stability.

[0114] A plurality of transmission radial protrusions 510 and a plurality of transmission radial opening grooves 511 are provided on the outer peripheral wall of the transmission member 51. The plurality of transmission radial protrusions 510 are arranged at intervals along the circumference of the rotor core 10, and a transmission radial opening groove 511 is formed between every two adjacent transmission radial protrusions 510. The transmission member 51 is disposed in the first end damping member 61, and the transmission radial protrusions 510 are fitted in the first radial damping inward opening grooves 615, and the first damping radial protrusions 616 are fitted in the transmission radial opening grooves 511.

[0115] The first boss 514 faces the left end surface of the rotor core 10, the first base 513 cooperates with the first center hole 617 of the first end vibration damper 61, and the first boss 514 is located inside the first end vibration damper 61. The first base 513 and the first boss 514 are both provided with first through holes, and the rotating shaft 30 passes through the first base 513 and the first boss 514 through the corresponding first through holes.

[0116] The minimum distance between the boss 514 and the first end surface of the rotor core 10 in the axial direction of the rotor core 10 is L1, and L1>0.5 mm. The minimum gap between the boss 514 and the permanent magnet 20 in the radial direction of the rotor core 10 is L2, and L2>0.5 mm; the minimum gap between the base 513 and the permanent magnet 20 in the axial direction of the rotor core 10 is L3, and L3>0.5 mm.

[0117] The rotating shaft 30 passes through the transmission member 51, a part of the first end vibration damper 61, the rotor core 10, and the second end vibration damper 62 in sequence from left to right, and the transmission member 51, a part of the first end vibration damper 61, the rotor core 10, and the second end vibration damper 62 are all directly matched with the rotating shaft 30, so that when the rotor core 10 rotates, it drives the first end vibration damper 61 and the second end vibration damper 62 to rotate, and then drives the rotating shaft 30 to rotate through the joint action of a part of the first end vibration damper 61, the first transmission member 51, and the second end vibration damper 62.

[0118] The specific process of the rotor assembly according to the embodiment of the present invention may be:

[0119] Manufacturing the rotor core, permanent magnet, rotating shaft and transmission parts respectively;

[0120] Insert the rotor core onto the shaft through the shaft hole;

[0121] Put the assembled rotor core, rotating shaft and transmission parts into the mold and position them, and insert the multiple permanent magnets into the multiple magnet slots of the rotor core respectively;

[0122] The rotor core, permanent magnet, rotating shaft and transmission parts are formed into an integrated plastic-coated structure using rubber or thermoplastic elastomer material through an injection molding process, wherein the structure formed by the rubber or thermoplastic elastomer material is a vibration damping part.

[0123] The motor according to the embodiment of the present invention includes the rotor assembly 100 of any one of the above embodiments.

[0124] According to the motor of the embodiment of the present invention, by improving the structure of the rotor assembly, a vibration damping member and a transmission member can be provided at least at the end of the rotor core, and at least a part of the vibration damping member can be directly matched with the rotating shaft, and the other part of the vibration damping member can be matched with the rotating shaft through the transmission member, thereby avoiding a rigid connection between the rotating shaft and the rotor core. At the same time, the material amount of the vibration damping member is increased, thereby improving the noise reduction and vibration reduction effects of the entire motor.

[0125] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0126] 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 at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0127] 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 one; it can be a mechanical connection, an electrical connection, or communication with each other; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0128] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0129] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean 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 described specific features, structures, materials or characteristics 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 the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0130] 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. A rotor assembly, characterized in that: include: A rotor core, wherein the rotor core has a magnet slot and a shaft hole; A permanent magnet, wherein the permanent magnet is disposed in the magnet slot; A rotating shaft, the rotating shaft is arranged in the rotating shaft hole and there is a gap between the rotating shaft and the rotor core, and the first end and the second end of the rotating shaft extend out of the rotating shaft hole; A first end vibration damper, the first end vibration damper is disposed on a first end surface of the rotor core and connected to the rotor core; A transmission member, the transmission member is arranged in the first end vibration damping member, and the transmission member cooperates with the rotating shaft; a second end vibration damper, the second end vibration damper being arranged on a second end surface of the rotor core and connected to the rotor core, the second end vibration damper being directly matched with the rotating shaft, the rotor core driving the rotating shaft through the second end vibration damper and sequentially through the first end vibration damper and the transmission member; A portion of the first end vibration damper is directly matched with the rotating shaft, and the rotor core drives the rotating shaft through the portion of the first end vibration damper and sequentially through the first end vibration damper and the transmission member; The rotor core further comprises an external connection damper, wherein the rotor core has an axial through hole between adjacent magnet slots, the external connection damper is disposed in the axial through hole, a first end of the external connection damper is connected to the first end damper, and a second end of the external connection damper is connected to the second end damper; It also includes an internally connected vibration damper, which is arranged in the gap between the rotating shaft and the rotor core, the first end of the internally connected vibration damper is connected to the first end vibration damper, and the second end of the internally connected vibration damper is connected to the second end vibration damper.

2. The rotor assembly according to claim 1, characterized in that The first end vibration damping member and the second end vibration damping member are both made of viscoelastic material.

3. The rotor assembly according to claim 2, characterized in that: The loss factor of the viscoelastic material is greater than or equal to 0.

15.

4. The rotor assembly according to claim 2, characterized in that: The Shore hardness of the viscoelastic material is 20 degrees to 80 degrees.

5. The rotor assembly according to claim 1, characterized in that: The transmission member includes a base and a boss, the boss protrudes from the base toward the first end face of the rotor core, and the rotating shaft passes through the base and the boss; the minimum distance between the boss and the first end face of the rotor core in the axial direction of the rotor core is L1, and L1>0.5 mm.

6. The rotor assembly according to claim 5, characterized in that The minimum gap between the boss and the permanent magnet in the radial direction of the rotor core is L2, and L2>0.5 mm.

7. The rotor assembly according to claim 5, characterized in that: The minimum gap between the base and the permanent magnet in the axial direction of the rotor core is L3, and L3>0.5 mm.

8. The rotor assembly according to claim 1, characterized in that It also includes an intermediate connecting vibration damper, wherein there is a gap between the inner surface of the permanent magnet and the inner bottom surface of the magnet slot, the intermediate connecting vibration damper is arranged in the gap, the first end of the intermediate connecting vibration damper is connected to the first end vibration damper, and the second end of the intermediate connecting vibration damper is connected to the second end vibration damper.

9. The rotor assembly according to claim 8, characterized in that The rotor core is formed by stacking a plurality of rotor punchings along the axial direction of the rotor core, and the rotor punchings include full-bridge punchings and half-bridge punchings. The rotor core has a first end, a second end, and a middle section located between the first end and the second end. The first end and the second end are formed by stacking a plurality of the full-bridge punchings, and the middle section is formed by stacking a plurality of the half-bridge punchings.

10. The rotor assembly according to claim 9, characterized in that Among the half-bridge punches adjacent to each other in the axial direction of the rotor core in the middle section, one half-bridge punch is rotated by one magnetic pole relative to the other half-bridge punch along the circumferential direction of the rotor core.

11. The rotor assembly according to claim 9, characterized in that A portion of the multiple internal magnetic bridges of the semi-connected bridge punching sheets are provided with magnetic bridge holes which penetrate the internal magnetic bridges along the circumferential direction of the rotor core. In the internal magnetic bridges of the semi-connected bridge punching sheets adjacent in the axial direction of the rotor core, the internal magnetic bridge of one semi-connected bridge punching sheet is provided with the magnetic bridge hole, while the internal magnetic bridge of the other semi-connected bridge punching sheet has no magnetic bridge hole. A circumferentially connected vibration damper is provided in the magnetic bridge hole, and adjacent intermediately connected vibration dampers are connected to each other via the circumferentially connected vibration damper.

12. The rotor assembly according to claim 11, characterized in that The first end vibration damper, the second end vibration damper, the inner connection vibration damper, the outer connection vibration damper, the middle connection vibration damper and the circumferential connection vibration damper are integrally formed by injection molding of a viscoelastic material.

13. The rotor assembly according to claim 1, characterized in that The outer peripheral wall of the transmission member is provided with a transmission radial protrusion and a transmission radial opening groove located between adjacent transmission radial protrusions, the first end vibration damping member has a center hole, the peripheral wall of the center hole is provided with a vibration damping radial protrusion and a vibration damping radial opening groove located between adjacent vibration damping radial protrusions, the transmission radial protrusion is fitted in the vibration damping radial opening groove, and the vibration damping radial protrusion is fitted in the transmission radial opening groove.

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

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